JP2963734B2 - Filter regeneration device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a filter regeneration device for regenerating a filter used in a filtration device, and more particularly, to separation of processing chips from a machining fluid circulated and used in electric discharge machining. The present invention relates to a filter regeneration device applied to regenerate a filter to be removed.

[Conventional technology]

Generally, wire electric discharge machining is to perform electric discharge machining of a work by causing electric discharge between a wire electrode and a work which travels in a state where a machining liquid is supplied to a work portion of the work, and is difficult with a general machining method. It enables high-precision processing such as straight cut, edge cut, and taper cut of high-hardness materials, and is one of the indispensable processing machines in recent years for die manufacturing. The machining fluid supplied to the machining part during electrical discharge machining is used to avoid air discharge, remove machining debris, and stabilize electrical discharge machining.
Usually, a water-based working fluid, for example, a solution obtained by adding a small amount of an additive to water is used. Since the machining fluid of the used agent contains machining waste melted and dispersed by the electric discharge machining of the work, the material such as machining waste is separated from the used machining fluid by a filtration device having a filter, and clean machining is performed. It is circulated and used as a liquid.

Generally, a filter as shown in FIG. 5 is used as a filter for filtering a working fluid. FIG. 5 is a sectional view showing a section perpendicular to the center line of the filter.
The filter a includes an inner cylinder a ₁ , a cylindrical filter paper a ₂ , a reinforcing tape
a ₃ , composed of end plates, hangers, etc., not shown. The inner cylinder a ₁ is fabricated of a rigid material, and has a large number of small flow hole a _11. The outer peripheral side of the inner cylinder a ₁ is filter paper a ₂ is placed over and over again in the folded in tubular radiation shape. The filter paper a ₂ is, both end portions of the filter paper a ₂ around the inner cylinder a ₁ by the end plate which is fixed to both ends of the inner cylinder a ₂ is fixed, further, the central portion of the filter paper a ₂ is bulged is wound with a reinforcing tape a _3, etc. are reinforced so as not to. A hanger is attached to one end plate.

For example, as shown in FIG. 6, a plurality of the filters a are arranged in a filtration tube b of a filtration device. This filtration device is composed of a filter tube b composed of a closed container, a dirty tank c, a clean tank d and the like. The air vent passage which is provided on the upper end of the filtration tube b is vent valve b ₁ is provided, also, the drain passage provided at the lower end of the filtration tube b is
Drain valve b ₂ are provided. Furthermore, dirty tank c
Drain cock c ₁ is the lower part is provided with, also drain cock d ₁ is provided at the lower portion of the clean water tank d.

The used machining fluid that has returned from the electric discharge machine through the machining fluid collection passage e, that is, the machining fluid containing machining waste, is collected in the dirty tank c. Then, the processing liquid is stored in the dirty tank c, and a part of the processing waste precipitates in the dirty tank c. The working fluid pumped up from the dirty tank c by the pump f is sent from the suction strainer g to the filter cylinder b through the pipe h. At this time, the working fluid is regulated by the throttle valve i. The working fluid passes from the outer peripheral side of the filter a located within the filtration tube b into the inner cylinder a ₁ side. During this passage, swarf mixed in machining fluid adhering to the outer surface of the filter paper a ₂ filters a, passes through the flow hole a ₁₁ in the inner cylinder a ₁ only filtered working fluid, the filter valve j , Clean tank d through pipe k
Is stored in Then, the working fluid in the clean tank d is sent to a working machine such as a wire electric discharge machine through a suction strainer and a pipe m.

Pressure control of the pressure of the working fluid supplied to the filtration tube d is determined from the compressive strength of the filter paper a ₂ used, exceeding this pressure regulation, so that issues an alarm from contact with the pressure gauge n . If processing dust adheres to the outer peripheral surface of the filter a, the internal pressure of the filter cylinder b increases. Therefore, when an alarm sounds, it is regarded that the filter a is clogged, the machine is stopped, and the filter a is cleaned or a new one is removed. Filter replacement is performed. Since the filter is originally a consumable item, it is desirable to immediately replace it with a new one. However, in reality, the filter is cleaned and used again. Since the regenerated filter a has a low filtration capacity and a short usage time, it is presently replaced with a new one after being repeatedly used several times.

[Problems to be solved by the invention]

In recent years, the technical progress of wire electric discharge machines has been remarkable, and with the rapid increase in machining speed, the amount of machining waste generated has also increased, and the number of filter cleaning or replacement with new ones has increased in proportion to it. This has been a cause of deterioration in processing efficiency. As one of the countermeasures, it is conceivable to increase the filtration area by increasing the number of filters a, for example. However, in that case, there is a problem that the size of the filter cylinder b is increased and the cost is unavoidable. .

It is also conceivable to suppress clogging of the filter. As one example, for example, a method of removing machining dust from an electric discharge machining liquid as disclosed in Japanese Patent Application Laid-Open No. 1-140925 is known. That is, as a work in electric discharge machining, a steel material is mainly used, and machining waste in the machining fluid has magnetism,
From the viewpoint that the load on the filter can be reduced except for this, a magnetic mat is provided in the regeneration and circulation system of the working fluid, thereby removing magnetic working debris in the working fluid. However, not all machining chips have magnetism, and the method of removing machining chips with the EDM is insufficient. For example, carbon blackening the processing liquid does not have magnetism, and if the amount of the carbon is too large, if the processing waste contains carbon, it may cause an abnormal arc during the processing. In addition, carbon must be removed from the working fluid, and in order to remove foreign substances such as carbon, it is necessary to finally filter the brush with a filter.

Therefore, in order to reduce the number of times the filter is cleaned or replaced with a new one, it is necessary to completely remove the processing debris attached to the outer peripheral surface of the filter during the cleaning of the filter, thereby regenerating the used filter a as if it were a new one. There is. However, since the filter has a radially bent shape, it is impossible to completely remove the clogged processing debris by applying water pressure to the filter.

In addition, the filter is made of paper having a filtration performance of 3-5 [mu], that is, it is necessary to avoid wiping the filter surface in a soft state containing moisture during cleaning.

In addition to the method of applying water pressure, there is also a method of removing processing waste from the filter by drying the filter and applying light vibration, but the processing waste becomes dust, which is not a health-friendly method for workers, Processing debris cannot be completely removed from the filter.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. Even when the filter is used or immediately after use, that is, even when the filter remains wet, the filter paper of the filter is not damaged without damaging the filter paper. An object of the present invention is to provide a filter regenerating apparatus capable of completely removing processing waste adhering to an outer surface by the action of a flowing processing liquid and centrifugal force and drying the cleaned filter by blowing air on the filter. .

[Means for solving the problem]

The present invention is configured as follows to achieve the above object. That is, the present invention provides a filter including a cylindrical body having a large number of flow holes and a filter paper disposed around the cylindrical body, and rotatably holding the filter about a center axis of the cylindrical body of the filter as a rotation center. Holding device provided with a rotating shaft, a rotating drive device for giving a rotational motion to the filter through the rotating shaft of the holding device, and a water supply for supplying a working fluid to the filter for washing the filter paper with a working fluid. And a filter regeneration device having the same.

The filter regeneration device is configured such that one or a plurality of the filters can be stored in a sealable container.

Further, this filter regenerating apparatus is provided with a large number of fluid blowing pipes for supplying compressed air for drying the filter or working fluid for cleaning to the outer peripheral surface of the filter.

[Action]

Since the filter regeneration device according to the present invention is configured as described above, it operates as follows. That is, the filter regeneration device supplies the working fluid into the filter body from the water supply device after, for example, holding the used filter containing the moisture or the like immediately after use by the holding device. When the supply of the working fluid starts, the motor of the rotary drive device rotates, and the rotary power of the motor rotates the rotary shaft of the holding device via the transmission device of the rotary drive device, and the filter supported by the rotary shaft Rotate. Due to the rotation of the filter, centrifugal force acts on the processing waste and the processing fluid supplied to the cylindrical body, and the processing waste clogged in the filter paper is removed together with the processing fluid passing through the filter paper cylinder. In this way, even if the filter is in a state immediately after use, that is, in a state containing moisture, the processing dust attached to the surface of the filter can be completely removed without damaging the filter paper of the filter.

〔Example〕

Hereinafter, an embodiment of a filter regeneration device according to the present invention will be described with reference to the drawings.

FIGS. 1, 2, 3 and 4 show an embodiment of a filter regeneration apparatus according to the present invention. FIG. 1 is a sectional view showing an embodiment of a filter regeneration device according to the present invention, FIG. 2 is a plan view of the filter regeneration device shown in FIG.
FIG. 3 is a sectional view showing an example of a water supply device in the filter regeneration device shown in FIG. 1, and FIG. 4 is a sectional view of a holding device in the filter regeneration device shown in FIG.

The filter regeneration device is mainly provided with a rotary shaft 401 for rotatably holding the filter a virtual central axis or center axis a ₄ of the tube a ₁ is a cylindrical body constituting the filter a as a rotation center support device 25, the water supply device 30, rotary driving device for providing rotational motion to filter a through the rotation shaft 401 of the holding device 25 for supplying water to working fluid in the inner cylinder a ₁ filter a for cleaning the filter paper of the filter a with working fluid Is provided. The filter a, as shown in FIG. 5, those with filter paper tube a ₂ a large number of filter paper which are arranged on the outer periphery of the small flow hole a ₁₁ cylinder a ₁ among which the formation and inner cylinder a ₁ It is. Filter paper tube a ₂ is formed in a shape extending in the radial direction over and over again by bending a filter paper into a cylindrical shape in the circumferential direction.

This filter regeneration device is configured by incorporating one or a plurality (four in the figure) of filters a in a cylindrical sealable container 1, for example. In the body 2 of the container 1,
A cylinder 3 is provided, and a lid 5 is attached to a reciprocable rod 21 of the cylinder 3 via a hinge 4. For this reason, the lid 5 is configured to be able to open and close with respect to the upper part of the body 2 of the container 1 by the action of the cylinder 3. Further, the lid 5 is rotatable about the pivot 6 of the hinge 4 and can be completely opened to a position where it comes into contact with the stopper 7, that is, a position shown by a two-dot chain line 5A in FIG. The stopper 8 is rotatably attached to a bracket 22 provided on the body 2 of the container 1, and has a notch groove in the flange 9 and the lid 5 of the container 1.
The lid 5 is fixed to the container 1 by hooking and tightening the lid 10.

The inside of the container 1 is divided into four cleaning chambers 13 by a partition plate 11 and an upper plate 12.
Filters a are inserted through circular insertion openings 14 formed in the filter 12, and the filters a are installed in respective cleaning rooms, that is, cleaning rooms 13. The gap between the insertion opening 14 of the upper plate 12 and the outer peripheral surface of the filter a is minimized in order to prevent the filter a from falling when the filter is installed.

At the lower part of each cleaning chamber 13, an inclined surface 15 which becomes lower toward the center of the container 1 is formed.
An opening 16 is formed at the bottom of the opening. The opening 16 communicates with a discharge port 18 through a discharge passage 17.

Each of the cleaning chambers 13 has a pair of fluid outlet pipes facing each other so as to sandwich the filter a when the filter a is installed.
19 and 20 are arranged extending vertically. Each of the fluid outlet pipes 19 and 20 has a large number of outlets. A total of eight fluid outlet pipes 19 and 20 are all in communication with the fluid passage 23. The fluid passage 23 branches into a processing fluid passage 24 provided with a stop valve B and a air passage 26 provided with a stop valve C disposed in parallel. The machining fluid passage 24 provided with the stop valve B communicates with a supply source of machining fluid, and the air passage 26 provided with the stop valve C is communicated with a compressed air source. The stop valve B and the stop valve C operate in conjunction with each other to open either the working fluid or the compressed air from the outlets of the fluid outlet pipes 19 and 20 so as to blow out either one.

A water supply device 30 is attached to the lid 5 so as to correspond to each cleaning room 13. Each water supply device 30 is connected via a rotary pipe joint 31 to a distribution pipe joint 32 attached to the center of the lid 5. The distribution pipe joint 32 is connected to a supply source of a machining fluid via a machining fluid passage 33 including a flexible hose, an elastic pipe, and the like that enable the lid 5 to be opened and closed. A stop valve A is provided in the machining fluid passage 33 to supply or stop the machining fluid.

It is preferable that the stop valves A and B for the working fluid and the stop valve C for the compressed air are configured to operate in conjunction with each other.

At the lower part of the container 1, four rotating devices 40 constituting a rotary driving device for rotating the filter a are provided corresponding to the respective cleaning chambers 13. When the motor 41 of the rotary drive device rotates, the rotation is transmitted from a pulley 42 attached to the motor shaft to one of the rotary devices 40 via transmission means such as a chain or a belt. Next, each rotating device
With the transmission means such as a single chain or belt hung on pulleys 43, 44 attached to 40 rotary shafts 401, the remaining 3
The rotating shaft 401 of the original rotating device 40 is driven to rotate.

FIG. 3 shows an example of a specific structure of the water supply device 30 in the filter regeneration device. Water supply device 30
Are mainly a hollow cylindrical water pipe 301 connected to the rotary pipe joint 31, a pressing center 302 screwed to the tip of the water pipe 301, a spring 303 for urging the pressing center 302 in the axial direction, a pressing center. Sleeve 304 that holds 302 slidably in the axial direction, spring retainer 305 that is screwed to the inner surface of sleeve 304 to support the spring, collar 306 that is fitted to the outer peripheral surface of sleeve 304, and bearing
307, and collar 306 and bearing 307 to sleeve 304
It has a ring nut 308 that is screwed onto the outer peripheral surface of the sleeve 304 to be fixed thereon.

Further, in the water supply device 30, a through hole 309 is formed in the pressing center 302, and an outer peripheral portion of a lower end of the pressing center 302 is formed in a tapered shape. Pressing center
A groove 310 is formed on the side of the shaft 302 in the axial direction.
A guide pin 311 screwed to the sleeve 304 is engaged with 310. Step 3 formed in pressing center 302
Reference numeral 12 abuts against the end plate 313 of the sleeve 304 to prevent the sleeve 304 from coming off. The water supply device 30 is fitted from above into a cylindrical portion 51 formed on the lid 5 of the container 1, and the cylindrical portion 51 is covered with an end plate cover 314. The cylinder portion 51 is provided with an oil hole 52, and the space between the collar 306 and the cylinder portion 51 is filled with lubricating oil to lubricate the bearing 307. Bearing 3
A seal 315 is provided outside 07.

FIG. 4 shows an example of a specific structure of the rotating device 40 constituting the rotary driving device in the filter regeneration device. The rotating device 40 mainly includes a rotating shaft 40
1, a flange 402 formed at the upper end of the rotary shaft 401, a tapered center 403 formed above the flange 402, a sleeve 44 fixed to a thin shaft portion 404 formed below the rotary shaft 401, a flange 402. Rubber plate fixed with screws 405 on the upper surface of
406, a cover 408 with a blade fixed to the lower surface of the flange 402 with a screw 407, a bearing 409 and a collar 410 fitted on an outer peripheral portion of the rotating shaft 401, and a bearing 409 and a collar 4
It has a ring nut 411 screwed to the rotating shaft 401 to fix the 10 on the rotating shaft 401.

Further, in the rotary drive device of the filter regeneration device, the rotary device 40 is fitted in a cylindrical portion 151 formed on the inclined surface 15 of the container 1, and the cylindrical portion 151 is covered with an end plate cover 412. ing. An oiling hole 152 is provided in the cylindrical portion 151, and the space between the collar 410 and the cylindrical portion 151 is filled with lubricating oil to lubricate the bearing 409. Bearing 409
A seal 413 is provided on the outside.

In this filter regeneration device, the holding device 25 includes a pressing center 302 of the water supply device 30 and a rotation shaft 401 of the rotation device 40.
And a tapered center 403. Holding device 25 is inserted into the inner cylinder a ₁ filter a, and has a function of a virtual center line a ₄ filter a match rotational center a _4.

Next, an example of the operation of the filter regeneration device according to the present invention will be described.

The plurality of stoppers 8 provided on the sealable container 1 are removed, and the cylinder 3 is raised. As a result, the lid 5 fixed to the rod 21 of the cylinder 3 via the hinge 4 pivots, and the container 1 is opened. At this time, the lid 5 is completely opened from the raised position to the position where the lid 5 comes into contact with the stopper 7 around the pivot 6.

When the cleaned filter a is present in the container 1, the regenerated filter a is pulled out from the center of the container 1, and the used filter a is replaced with the filter a.
Is inserted into the container 1 such that the hanger attached to the upper side is on the upper side. At that time, the center 40 provided in the rotating device 40
3 is ready to be inserted into the inner cylinder a ₁ filter a.

The cylinder 3 is operated to close the lid 5, and the lid 5 is fastened and fixed with a plurality of fasteners 8.

In the water supply device 30 provided in the lid 5, a pressing center 302 having a through hole 309 is incorporated in a pressurized state in the direction of the filter a by a spring 303. When the lid 5 is closed, the filter a It is held and pressed against the rotating device 40.

A rubber plate 406 is attached to the upper end of the rotating device 40, and comes into contact with the packing adhered to the end surface of the filter a,
Rotational motion can be transmitted to the filter a by the frictional force between the two.

When the setting of the filter a is completed in this way, the stop valve A and the stop valve B are opened, and the machining liquid is supplied. At this time, since the stop valve C is closed, the compressed air is not supplied to the filter a.

When the supply of the working fluid starts, the motor 41 of the rotary drive device starts rotating. The rotation force from the output shaft of the motor 41 is transmitted to one of the rotation devices 40 via a belt or the like, and further transmitted to the other three rotation devices 40 via a belt or the like. Due to the rotation of the rotating device 40, the filters a supported by the rotating shaft 401 rotate independently as shown by arrows in FIG.

Swarf was clogged or filter paper or adhering to the outer surface of the filter a is washed with working fluid supplied from further outside the working fluid supplied from the inner cylinder a ₁ filter a, further filter a itself may be rotating at a high speed, the processing chips are bounced radially outward together with the processing liquid, and the processing chips are mixed with the processing liquid and flow out from the opening 16 to the discharge passage 17 together with the processing liquid, It is discharged out of the container 1 through the discharge port 18.

Further, the working fluid not only supplied to the inner cylinder a ₁ filter a, since then also supplied to the outer circumferential surface of the filter a and to give vibration to the filter paper, the removal of machining debris clogged filter paper Has a promoting effect. Further, since the partition plate 11 is provided in the container 1, it is possible to prevent the processing chips scattered from the filter a from adhering to another filter a.

After an appropriate time has elapsed, the stop valve A and the stop valve B are closed to stop water supply, and then the stop valve C is opened to start supplying compressed air.

The compressed air supplied to the outer surface of the filter a own high speed and filter a, moisture contained filter a is the scattering, so that the filter paper tube a ₂ is dried.

As described above, the regeneration process of the filter a is performed in the hermetically sealable container 1, so that the cleaning process for washing and drying can be performed in a short time without generating stains on workers, work clothes, and the like. Ends.

As described above, the filter regeneration device according to the present invention is configured as described above, but is not necessarily limited to the above embodiment. In the above embodiment, the supply of the processing liquid is performed by the lid 1.
However, the present invention is not limited to this. For example, a through-hole may be provided in the rotation shaft 401 and the center 403 of the rotation device 40, and water may be supplied via a rotary pipe joint as in the case of the water supply device 30.

The rotating device 40 includes a flange 4 of the rotating shaft 401.
02, the rubber plate 406 attached to the upper surface of the filter a is brought into contact with the packing adhered to the end surface of the filter a, and the rotational motion is transmitted to the filter a by the frictional force between them. May be fixed so that the filter a can be stored in the rotating car.

Further, in the above embodiment, use what the filter a, consisted filter paper tube a ₂ a filter paper disposed on the outer periphery of a number barrel a ₁ among which form small flow hole a ₁₁ in the inner cylinder a ₁ However, the present invention is not limited to the structure of the filter itself.For example, this filter regenerating apparatus uses an outer cylinder as a filter cylinder, and includes a filter paper cylinder as a filter paper inside the outer cylinder. It is also possible to wash the arrangement.

Further, in the above embodiment, instead of the one with the cylinder a ₁ among the formation of many small flow hole a ₁₁ filters a,
It is sufficient that the inner cylinder can support the filter paper and allow the processing liquid to pass through. The inner cylinder or the outer cylinder can be constructed by assembling a frame. Are fluid holes, and have a function of passing a machining fluid.

Further, the operation of the stop valve A, the stop valve B, and the stop valve C may be configured to be performed in an interlocking operation by a command from a controller by a timer using an electromagnetic valve or the like.

The above embodiment mainly describes a wire electric discharge machine,
The liquid of the feed water in the present invention may be water, but when the present invention is used as a regeneration device of a filter used in a die sinking electric discharge machine, the liquid of the feed water is used in the die sink electric discharge machine. It becomes a working fluid. Further, the electric discharge machining fluid discharged from the filter regeneration device of the present invention is recovered by an appropriate method.

〔The invention's effect〕

Since the filter regeneration device according to the present invention is configured as described above, it has the following effects. That is, in this filter regeneration device, the processing waste clogged in the filter paper passes through the filter paper due to the centrifugal force acting on the processing fluid supplied into the inner cylinder of the filter and the centrifugal force acting on the processing waste. Since it is bounced off together with the working fluid, it is possible to completely remove from the filter any processing waste that could not be completely removed by applying water pressure. Moreover, since the surface of the filter is not scraped, the filter paper of the filter is not damaged. For this reason, the filter capacity of the regenerated filter hardly decreases as in the case of a new filter, so that the regenerated filter can be used for a long time even after the filter is regenerated, and the number of reusable filters increases, leading to a reduction in cost.

In addition, since the filter in a soft state that still contains moisture immediately after use can be applied to the filter regeneration device,
Since the operation of once drying the filter is not required at all, the regeneration of the filter can be completed in a short time, and the processing waste does not become dust and does not adversely affect the worker.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a filter regeneration device according to the present invention, FIG. 2 is a plan view of the filter regeneration device shown in FIG. 1, and FIG. 3 is a water supply device in the filter regeneration device shown in FIG. , FIG. 4 is a cross-sectional view of a holding device in the filter regenerating apparatus shown in FIG. 1, FIG. 5 is a cross-sectional view of the filter, and FIG. 6 is a diagram of a filtering device used in a wire electric discharge machine. It is explanatory drawing which shows an example. a ...... filter, a ₁ ...... the barrel (cylindrical body), a ₁₁ ...... flow hole, a ₂ ...... filter paper tube (filter paper), a ₄ ...... central axis 1 ...... vessel, 19, 20 ...... Fluid blow-off pipe, 25 holding device, 30 water supply device, 40 rotating device (rotary drive device), 41 motor (rotary drive device), rotary shaft 401.

Claims (3)

(57) [Claims] 1. A filter comprising a cylindrical body having a large number of flow holes and a filter paper disposed around the cylindrical body, and the filter rotatably held about a center axis of the cylindrical body of the filter as a center of rotation. A holding device having a rotating shaft, a rotation driving device that applies a rotating motion to the filter through the rotating shaft of the holding device, and a water supply device that supplies a working fluid to the filter to wash the filter paper with the working fluid; A filter regeneration device having: 2. The filter regenerating apparatus according to claim 1, wherein one or a plurality of said filters can be stored in a sealable container. 3. The filter regenerating apparatus according to claim 1, wherein a plurality of fluid outlet pipes are provided for supplying compressed air for drying the filter or working fluid for cleaning to the outer peripheral surface of the filter.