CN114272675B - Oil liquid filtering system with magnetic filter and filtering method thereof - Google Patents
Oil liquid filtering system with magnetic filter and filtering method thereof Download PDFInfo
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- CN114272675B CN114272675B CN202210207433.9A CN202210207433A CN114272675B CN 114272675 B CN114272675 B CN 114272675B CN 202210207433 A CN202210207433 A CN 202210207433A CN 114272675 B CN114272675 B CN 114272675B
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Abstract
The invention discloses an oil liquid filtering system with a magnetic filter and a method thereof, wherein the oil liquid filtering system comprises a first oil return pipeline, an oil tank, a filtering tank, an oil outlet pipe and a slag scraper; the first oil return pipeline is communicated with the magnetic filter; an oil return branch pipe is arranged on the first oil return pipeline, and a proportional valve is arranged on the oil return branch pipe. The invention has the beneficial effects that: firstly, the magnetic filter is used for carrying out primary separation on the iron scraps and removing most of the iron scraps, so that the load of secondary filtration of the filter tank is reduced and the service life of the filter tank is prolonged. Meanwhile, when the processing equipment is in insufficient work, the proportional valve is communicated, so that dirty oil which is subjected to primary separation in the dirty oil area is supplied to the magnetic filter through the oil return branch pipe again, the use efficiency of the magnetic separator is further improved, and the safety of the system is enhanced. And finally, high-pressure air is introduced to stir and back blow the dirt in the filtering tank, so that the cleaning efficiency is improved.
Description
Technical Field
The invention relates to the field of machinery, in particular to an oil liquid filtering system with a magnetic filter and a filtering method thereof.
Background
In the field of machining, a large amount of cooling oil is used for cooling drill bits, milling cutters, turning tools, grinding machine processing equipment and the like. The used cooling oil carries a large amount of metal debris, and the cooling oil must be filtered before being reused. The metal debris can block the filter element, thereby reducing the service life of the filter element; after long-time filtration, residual oil with high concentration can be remained in a filter element of the filtering equipment, and the residual oil can also block the filter element, so that the service life of the filter element is shortened, and how to improve the service life of the filtering equipment is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide an oil liquid filtering system with a magnetic filter and a method thereof, wherein the oil liquid filtering system is convenient for cleaning a filter element and enables the service life of the filter element to be longer.
In order to achieve the purpose, the invention provides the following technical scheme:
an oil liquid filtering system with a magnetic filter comprises a first oil return pipeline for recovering cooling oil, at least one oil tank and a plurality of filtering tanks, wherein the first oil return pipeline is provided with at least one oil return pump, each filtering tank comprises an oil inlet and an oil outlet, and a dirty oil area and a clean oil area are arranged in the oil tank; the oil purifier is characterized by also comprising a plurality of filter pumps for conveying dirty oil in the dirty oil area into the filter tank through the oil inlet, the oil outlets are communicated with the oil purifying area, all the oil outlets are connected with at least one oil outlet pipe through pipelines, and the oil outlet pipe is provided with a back-blowing inlet; a residual oil outlet for discharging residual oil is also arranged at the bottom of each filtering tank, and the residual oil outlet is connected with a residual oil pipe; the slag scraper is used for collecting all residual oil discharged from the residual oil outlet; the first oil return pipeline is communicated with a plurality of magnetic filters; each magnetic filter comprises an iron scrap outlet and is communicated with the dirty oil area through a second oil return pipeline; an oil return branch pipe is arranged on the first oil return pipeline, and a proportional valve which is conducted only when the oil pressure in the first oil return pipeline is insufficient is arranged on the oil return branch pipe; the oil return pump is arranged between the oil return branch pipe and the magnetic filter.
Preferably, the top of each magnetic filter is communicated with the first oil return pipeline through an oil delivery pipe, the bottom of each magnetic filter is provided with a funnel-shaped oil receiving hopper, the bottom of the oil receiving hopper is provided with an oil discharge port, and the oil discharge port is communicated with the second oil return pipeline; and a conveying belt positioned below the scrap iron outlet is arranged in the slag scraping machine.
Preferably, the slag scraper comprises a box body, an anti-overflow port is arranged on the box body, and the anti-overflow port is communicated with the second oil return pipeline; an oil discharge pump is arranged in the box body and communicated with the dirty oil area through an oil discharge pipeline; the top of the box body is provided with a slag discharge port; the conveying belt is arranged in the box body, and one end of the conveying belt is arranged above the slag discharging port; and an oil mist cover is arranged at the top of the box body.
Preferably, the filter tank further comprises a back blowing gas source, wherein the back blowing gas source is communicated with the filter tank from the upper part or the top of the filter tank through a main back blowing pipe and is communicated with the filter tank from the lower part or the bottom of the filter tank through a branch back blowing pipe; the main blowback pipe is provided with a first pneumatic valve, and the branch blowback pipe is provided with a second pneumatic valve; an exhaust port is arranged at the upper part or the top of the filter tank and is connected with an exhaust pipe; and a third pneumatic valve is arranged on the exhaust pipe.
Preferably, the pneumatic control valve further comprises a control air source, and the control air source is connected with the first pneumatic valve, the second pneumatic valve and the third pneumatic valve through a plurality of control air branch pipes; and each control gas branch pipe is provided with an electromagnetic valve for controlling the opening and closing of the control gas branch pipe.
Preferably, a fourth pneumatic valve is arranged on the slag oil pipe, and a fifth pneumatic valve is arranged on the oil outlet pipe; the control air branch pipe is connected with the fourth pneumatic valve, and a control air sub-branch pipe communicated with the fifth pneumatic valve is connected to the control air branch pipe; the fourth pneumatic valve and the fifth pneumatic valve are respectively of a normally open type and a normally closed type, or the fourth pneumatic valve and the fifth pneumatic valve are respectively of a normally closed type and a normally open type.
Preferably, the blowback air source is communicated with compressed air with the pressure of 3.5-4 bar, and the control air source is communicated with compressed air with the pressure of 6 bar.
Preferably, the oil outlet is arranged at the top of the filtering tank; the branch back-blowing air pipe is communicated with the slag oil pipe; the main back-blowing air pipe is communicated with the oil outlet pipe.
Preferably, the slag oil pipe and the exhaust pipe are arranged in the slag scraping machine, and the exhaust pipe is communicated with the atmosphere through a safety valve.
The invention also provides an oil liquid filtering method with the magnetic filter, which comprises the oil liquid filtering system with the magnetic filter; the method comprises an external circulation filtering method, wherein the external circulation filtering method comprises the following steps:
1.1) scrap iron separation: cooling oil recovered from processing equipment is sent to a magnetic filter through the first oil return pipeline by the oil return pump, scrap iron is separated from the cooling oil by the magnetic filter, and the cooling oil after the scrap iron is separated by the magnetic filter is sent to the dirty oil area through a second oil return pipeline; scrap iron obtained by the separation of the magnetic filter is sent to a slag scraper;
1.2) filtering: the cooling oil in the dirty oil area is sent into the filter tank through a filter pump to be filtered, a filter element for filtering the cooling oil is arranged in the filter tank, the cooling oil filtered by the filter element is discharged through an oil outlet formed in the top of the filter tank, and is sent into an oil purification area through an oil outlet pipe;
1.3) oil supply: sending the cooling oil in the oil purification area to processing equipment for recycling through an oil supply pump;
it also includes a method of decontamination, which is performed periodically or non-periodically to remove the residual oil deposited in the filtration tank, the method of decontamination including the steps of:
2.1) blowing foam: blowing high-pressure gas into the filter tank through a residual oil outlet at the bottom of the filter tank so as to form bubbles in residual oil, so as to reduce the adsorption force of the residual oil on a filter element of the filter tank and on the inner wall of the filter tank; the blown high-pressure gas is discharged from an exhaust port arranged at the upper part of the filter tank, the exhaust port is connected with an exhaust pipe, and an outlet of the exhaust pipe is arranged in the slag scraper;
2.2) back flushing residual oil: introducing high-pressure gas into the filtering tank through the oil outlet, discharging the blown high-pressure gas from the inside of the filter element to the outside of the filter element so as to press residual oil in the filtering tank to be discharged through the residual oil outlet, and sending the residual oil into the residue scraping machine through a residue oil pipe;
2.3) scrape the sediment, be provided with the driving chain in scraping the sediment machine, the driving chain by scrape the bottom of sediment machine and extend to setting up scrape the slag notch at sediment machine top, two be provided with a plurality of scraper blade between the driving chain, scrape the sediment machine and start regularly or irregularly the driving chain, in order to with scrape the residual oil of sediment built-in sediment and discharge to the slag notch.
Preferably, it further comprises an internal circulation filtration process comprising the steps of:
3.1) the oil return pump sends the cooling oil in the dirty oil area into the magnetic filter through an oil return branch pipe; scrap iron is separated from the cooling oil by the magnetic filter, and the cooling oil with the scrap iron separated by the magnetic filter is sent to the dirty oil area through the second oil return pipeline; scrap iron obtained by the separation of the magnetic filter is sent to a slag scraper; the oil return branch pipe is communicated with the first oil return pipeline through a proportional valve; the proportional valve is opened under the condition that the oil supply of the processing equipment is insufficient, and is closed under the condition that the oil supply of the processing equipment is sufficient.
The invention has the beneficial effects that: dirty oil from processing equipment is through the dirty oil district of magnetic filter entering main oil tank promptly through the primary separation with scrap iron etc. get rid of among them to alleviate the load of filter tank secondary filtration and improve its life. The iron fillings that separate out through the magnetic separation machine are discharged through the conveyer belt that sets up on scraping sediment machine upper portion, scrape the sediment machine with iron fillings and the same row's cinder notch of dregs sharing discharge, have reached the purpose of simplified structure, have also realized the wet separation futilely simultaneously, avoid iron fillings to get into the residual oil and increase the problem of scraping sediment work load, have improved the efficiency of scraping the sediment. When the processing equipment works normally, the oil return pump supplies oil to the magnetic filter through the first oil return pipeline; when the processing equipment is in insufficient work, the proportional valve is conducted, so that dirty oil which is subjected to primary separation in the dirty oil area is supplied to the magnetic filter through the oil return branch pipe again, the use efficiency of the magnetic separator is further improved, the load of the filter tank is reduced, and the operation safety of the whole system is enhanced. And finally, high-pressure air is introduced to stir and back blow the dirty slag in the filtering tank, so that the efficiency and the safety of filtering and cleaning the dirty slag are improved. The high-pressure air is introduced to stir the dirty slag in the filter tank for one time and blow back for one time, a large amount of bubbles are generated in the residual oil by the high-pressure air blown in from the bottom of the filter tank through the air pipe to roll, so that the iron slag attached to the surface of the filter element becomes loose, and the residual oil is blown out of the residual oil pipe at the bottom by the high-pressure air blown in from the top of the filter tank through the main air blowing pipe, so that the purpose of thoroughly cleaning the filter element is achieved. Compared with a filter without a back-blowing function, the filter greatly prolongs the service life of the filter element; compared with a filter with only one back flushing, the filter disclosed by the invention has the advantages that the iron slag attached to the surface of the filter element is loosened firstly, and then is discharged in a back flushing manner, so that the problem that the iron slag is deposited in the filter tank and is difficult to blow out is effectively avoided, and the cleaning efficiency and safety are improved.
Drawings
FIG. 1 is a schematic view of an exploded configuration of an oil filtration system of the present invention;
FIG. 2 is a schematic top view of the oil filtration system of the present invention;
FIG. 3 is a schematic view of the internal structure of the slag scraper;
fig. 4 is a schematic view of a piping structure of the oil filter system of the present invention.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to specific embodiments.
In the description of the present invention, it should be noted that the terms "inside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 4, an oil filtration system with a magnetic filter according to the present invention includes a first oil return line 10 for recovering cooling oil, an oil tank 12, and a plurality of filter tanks 14, wherein the first oil return line 10 is provided with an oil return pump 16, each filter tank 14 includes an oil inlet and an oil outlet, and the oil tank 12 is provided with a dirty oil area 18 and a clean oil area 20; the device also comprises a plurality of filter pumps 22 which send the dirty oil in the dirty oil area 18 into the filter tank 14 through an oil inlet, the oil outlets are communicated with the oil purification area 20, all the oil outlets are connected with at least one oil outlet pipe 24 through pipelines, and the oil outlet pipe 24 is provided with a back-blowing inlet; a residual oil outlet for discharging residual oil is also arranged at the bottom of each filter tank 14 and is connected with a residual oil pipe 26; also included is a residue scraper 28 for collecting any residue discharged from the residue outlet.
The above-described structure mainly solves the problem of filtration of cooling oil for reuse and the problem of cleaning of residual oil deposited in the filter element of the filter tank 14. The structures and the principles of the filtering tank 14 and the back flushing of the residual oil are not the innovative points of the present invention, and are disclosed in the applications of the antecedents 202022604705.8 and 202022608695.5, and thus are not described in detail.
The first oil return pipeline 10 is communicated with 3 magnetic filters 30; each magnetic filter 30 includes a scrap iron outlet 32, and each magnetic filter 30 is in communication with the dirty oil region 18 via a second return line 34. The top of each magnetic filter 30 is connected to the first oil return line 10 through an oil feed pipe 36, the bottom of each magnetic filter 30 is provided with a funnel-shaped oil receiving bucket 38, the bottom of the oil receiving bucket 38 is provided with an oil discharge port, and the oil discharge port is connected to the second oil return line 34. The structure and principle of the magnetic filter 30 for separating iron filings can be seen in the antecedents 202022608701.7, 202022604702.4, etc. of this application, which are described in detail, and the structure itself is not the innovation point of the present invention, and thus is not described in detail.
An oil return branch pipe 40 is arranged on the first oil return pipeline 10, and a proportional valve 42 which is conducted only when the oil pressure in the first oil return pipeline 10 is insufficient is arranged on the oil return branch pipe 40; scavenge pump 16 is disposed between scavenge manifold 40 and magnetic filter 30; a conveyor belt 44 is disposed in the slag scraper 28 below the scrap iron outlet 32. The proportional valve 42 can proportionally control the flow rate and change the direction of the liquid flow, and the working principle thereof is well known in the industry and can be purchased as required.
In the cooling oil that processing equipment came, the more problem of metal piece has been solved to above-mentioned structure, and magnetic filter 30 first carries out primary separation to metal piece wherein through strong magnet, then sends comparatively cleaner cooling oil into dirty oily district 18, conveniently filters jar 14 and carries out secondary filter. This also directly reduces the load on the filter cartridge in the canister 14 and increases the useful life of the filter cartridge. The metal chips separated therefrom are sent to a slag scraper 28 and collected by the slag scraper 28. This avoids the problem of adding a separate collection device, and simplifies the structure. In consideration of the interruption or insufficient workload of the processing equipment, the oil supply is insufficient when the oil is fed into the magnetic filter 30 from the first oil return pipeline 10, so that the magnetic filter 30 and the oil return pump 16 idle; for this purpose, a proportional valve 42 is added, and when the above occurs, the oil return branch pipe 40 is opened, so that the oil in the dirty oil region 18 can be sent to the magnetic filter 30 through the first oil return pipe 10, thereby realizing internal circulation and improving the filtering efficiency and the overall safety.
The slag scraper 28 comprises a box body 46, an overflow-preventing opening 48 is arranged on the box body 46, and the overflow-preventing opening 48 is communicated with the second oil return pipeline 34; an oil discharge pump 50 is arranged in the box body 46, and the oil discharge pump 50 is communicated with the dirty oil area 18 through an oil discharge pipeline 52; the top of the box body 46 is provided with a slag discharge port 54; the conveying belt 44 is arranged in the box body 46, one end of the conveying belt 44 is arranged above the slag discharge port 54, the conveying belt 44 is driven by a driving motor 60 to rotate circularly, two annular transmission chains 56 are symmetrically arranged in the box body 46, the transmission chains 56 extend from the bottom of the box body 46 to the slag discharge port 54, and a plurality of scraping plates 58 are arranged between the two transmission chains 56; the tank 46 is provided with an oil mist cover 62 at the top.
The iron chips fall onto the conveying belt 44 from the iron chip outlet 32 and are discharged from the conveying belt 44 through the slag discharge port 54. On the conveyor belt 44, the oil entrained therein drops into the machine box below, thereby avoiding being discharged, and improving the recovery efficiency of the oil. Scrap iron is directly discharged and does not enter the slag scraper 28, so that the increase of the slag scraping workload is avoided.
The oil discharge pump 50 is used for discharging the oil precipitated and separated in the cabinet in advance before scraping the slag, so as to recycle the oil, thereby improving the oil recycling efficiency and improving the slag discharging efficiency of the slag scraper 28 (the dry residual oil is easier to be scraped by the scraper 58). The oil mist cover 62 is used for preventing oil mist in the machine case from escaping. The overflow prevention opening 48 is used to prevent the liquid level in the slag scraper 28 from being too high, and when the liquid level is too high, the oil in the slag scraper is returned to the dirty oil region 18 by the second oil return pipeline 34.
The filter tank 14 is communicated with the back blowing air source 64 from the upper part or the top of the filter tank 14 through a main back blowing air pipe 66, and is communicated with the filter tank 14 from the lower part or the bottom of the filter tank 14 through a branch back blowing air pipe 68; a first pneumatic valve 70 is arranged on the main blowback pipe 66, and a second pneumatic valve 72 is arranged on the branch blowback pipe 68; an exhaust port is arranged at the upper part or the top part of the filter tank 14 and is connected with an exhaust pipe 74; a third pneumatic valve 76 is provided on the exhaust tube 74.
The pneumatic valve further comprises a control air source 78, wherein the control air source 78 is connected with the first pneumatic valve 70, the second pneumatic valve 72 and the third pneumatic valve 76 through a plurality of control air branch pipes 80; each control gas branch pipe 80 is provided with an electromagnetic valve 82 for controlling the opening and closing of the control gas branch pipe 80. The pneumatic valve is used more in the invention, so that the danger of combustion or explosion caused by the contact of the electric valve and oil gas is avoided.
After a period of use, residual oil and scrap iron with large concentration can be accumulated in the filtering tank 14 and are attached to the surface of the filtering element in the filtering tank 14 to cause blockage, the residual oil and the scrap iron are difficult to clean, and the filtering effect is reduced.
The working principle is that firstly, the high-pressure air is blown into the filter tank 14 through the residual oil pipe 26 at the bottom by the back-blowing air pipe 68, a large amount of air bubbles are generated in the filter tank 14, and the iron chips and the dirt attached to the surface of the filter element in the filter tank 14 are stirred and loosened to separate from the adsorption of the filter element, so as to be discharged. The high pressure gas is fed into the slag scraper 28 through a higher positioned exhaust duct 74 to avoid toxic and harmful gases from directly entering the atmosphere. At this point, loose dirt and oil remains in the canister 14. Then, high-pressure air is blown from the oil outlet pipe 24 through the main back-blowing air pipe 66, so that the filter element is back-blown from inside to outside (the common filter element structure is that dirty oil is arranged around the filter element, filtered clean oil is arranged in the middle of the filter element, and the clean oil is discharged from an oil outlet, and vice versa); the dirty residue and dirty oil around the filter element are discharged from the residual oil outlet under the action of high-pressure gas, and are sent to a residue scraper 28 for subsequent treatment.
Further, the blowback air source 64 is communicated with compressed air with the pressure of 3.5-4 bar, and the control air source 78 is communicated with compressed air with the pressure of 6 bar. bar is a unit of pressure, corresponding to 0.1 mpa. The compressed air with the pressure can obtain better control effect and back flushing effect, and simultaneously avoids the waste of the pressure.
Furthermore, a filter screen 84 is arranged in front of the filter pump 22, and a check valve 86 is arranged behind the filter pump 22.
Further, the exhaust pipe 74 is vented to the atmosphere through a safety valve 88, and the safety valve 88 is disposed in front of the third pneumatic valve 76, which can effectively avoid the danger of excessive pressure in case of abnormal valve closing.
Further, a fourth pneumatic valve 90 is arranged on the residual oil pipe 26, and a fifth pneumatic valve 92 is arranged on the oil outlet pipe 24; a control air branch pipe 80 is connected with the fourth pneumatic valve 90, and the control air branch pipe 80 is connected with a control air branch pipe 94 communicated with a fifth pneumatic valve 92; the fourth and fifth air-operated valves 90 and 92 are normally open type and normally closed type, respectively, or the fourth and fifth air-operated valves 90 and 92 are normally closed type and normally open type, respectively. The pneumatic control valve has the effects that two pneumatic valves can be controlled through one path of control air branch pipe 80 and one solenoid valve 82, and the fourth pneumatic valve 90 and the fifth pneumatic valve 92 are effectively ensured to be interlocked, so that the cost is saved, and the overall safety is improved.
Based on the structure and the respective working principle, the invention also provides an oil liquid filtering method which comprises an external circulation filtering method, an internal circulation filtering method and a dirt removing method.
The external circulation filtering method comprises the following steps:
1.1) scrap iron separation: cooling oil recovered from processing equipment is sent to a magnetic filter through a first oil return pipeline by the oil return pump, scrap iron is separated from the cooling oil by the magnetic filter, and the cooling oil after the scrap iron is separated by the magnetic filter is sent to the dirty oil area through a second oil return pipeline; scrap iron obtained by the separation of the magnetic filter is sent to a slag scraper;
1.2) filtering: the cooling oil in the dirty oil area is sent into the filter tank through a filter pump to be filtered, a filter element for filtering the cooling oil is arranged in the filter tank, the cooling oil filtered by the filter element is discharged through an oil outlet formed in the top of the filter tank, and is sent into an oil purification area through an oil outlet pipe;
1.3) oil supply: sending the cooling oil in the oil purification area to processing equipment for recycling through an oil supply pump;
based on the structure and respective working principles, the internal circulation filtering method of the invention is a method for avoiding the idle running of the magnetic filter 30 when the processing equipment is in insufficient operation or in a shutdown state, and comprises the following steps: the oil return pump sends the cooling oil in the dirty oil area to the magnetic filter through an oil return branch pipe; scrap iron is separated from the cooling oil by the magnetic filter, and the cooling oil with the scrap iron separated by the magnetic filter is sent to the dirty oil area through the second oil return pipeline; scrap iron obtained by the separation of the magnetic filter is sent to a slag scraper; the oil return branch pipe is communicated with the first oil return pipeline through a proportional valve; the proportional valve is opened under the condition that the oil supply of the processing equipment is insufficient, and is closed under the condition that the oil supply of the processing equipment is sufficient.
Based on the structure and the respective working principle, the decontamination method comprises the following steps:
2.1) blowing foam: blowing high-pressure gas into the filter tank through a residual oil outlet at the bottom of the filter tank so as to form bubbles in residual oil, thereby reducing the adsorption force of the residual oil on a filter element of the filter tank and on the inner wall of the filter tank, wherein the blown high-pressure gas is discharged from an exhaust port arranged at the upper part of the filter tank, the exhaust port is connected with an exhaust pipe, and an outlet of the exhaust pipe is arranged in the slag scraper;
2.2) back flushing residual oil: introducing high-pressure gas into the filtering tank through the oil outlet, discharging the blown high-pressure gas from the inside of the filter element to the outside of the filter element so as to press residual oil in the filtering tank to be discharged through the residual oil outlet, and sending the residual oil into the residue scraping machine through a residue oil pipe;
2.3) scrape the sediment, be provided with the driving chain in scraping the sediment machine, the driving chain by scrape the bottom of sediment machine and extend to setting up scrape the slag notch at sediment machine top, two be provided with a plurality of scraper blade between the driving chain, scrape the sediment machine and start regularly or irregularly the driving chain, in order to with scrape the residual oil of sediment built-in sediment and discharge to the slag notch.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. An oil liquid filtering system with a magnetic filter comprises a first oil return pipeline for recovering cooling oil, at least one oil tank and a plurality of filtering tanks, wherein the first oil return pipeline is provided with at least one oil return pump, each filtering tank comprises an oil inlet and an oil outlet, and a dirty oil area and a clean oil area are arranged in the oil tank; still include a plurality of with dirty oil in dirty oil district is through the oil inlet send into the filtration pump of filtration jar, the oil-out intercommunication clean oil district, its characterized in that: all the oil outlets are connected with at least one oil outlet pipe through pipelines, and a back-blowing inlet is formed in each oil outlet pipe; a residual oil outlet for discharging residual oil is also arranged at the bottom of each filtering tank, and the residual oil outlet is connected with a residual oil pipe; the slag scraper is used for collecting all residual oil discharged from the residual oil outlet; the first oil return pipeline is communicated with a plurality of magnetic filters; each magnetic filter comprises an iron scrap outlet and is communicated with the dirty oil area through a second oil return pipeline; an oil return branch pipe is arranged on the first oil return pipeline, and a proportional valve which is conducted only when the oil pressure in the first oil return pipeline is insufficient is arranged on the oil return branch pipe; the oil return pump is arranged between the oil return branch pipe and the magnetic filter; the back blowing air source is communicated with the filter tank from the upper part or the top of the filter tank through a main back blowing pipe and is communicated with the filter tank from the lower part or the bottom of the filter tank through a branch back blowing pipe; the main blowback pipe is provided with a first pneumatic valve, and the branch blowback pipe is provided with a second pneumatic valve; an exhaust port is arranged at the upper part or the top of the filter tank and is connected with an exhaust pipe; and a third pneumatic valve is arranged on the exhaust pipe.
2. The oil filtration system with the magnetic filter of claim 1, wherein: the top of each magnetic filter is communicated with the first oil return pipeline through an oil delivery pipe, the bottom of each magnetic filter is provided with a funnel-shaped oil receiving hopper, the bottom of the oil receiving hopper is provided with an oil discharge port, and the oil discharge port is communicated with the second oil return pipeline; and a conveying belt positioned below the scrap iron outlet is arranged in the slag scraping machine.
3. The oil filtration system with the magnetic filter of claim 2, wherein: the slag scraper comprises a box body, an anti-overflow port is arranged on the box body, and the anti-overflow port is communicated with the second oil return pipeline; an oil discharge pump is arranged in the box body and communicated with the dirty oil area through an oil discharge pipeline; the top of the box body is provided with a slag discharge port; the conveying belt is arranged in the box body, and one end of the conveying belt is arranged above the slag discharge port; and an oil mist cover is arranged at the top of the box body.
4. The oil filtration system with the magnetic filter of claim 1, wherein: the control air source is connected with the first pneumatic valve, the second pneumatic valve and the third pneumatic valve through a plurality of control air branch pipes; and each control gas branch pipe is provided with an electromagnetic valve for controlling the opening and closing of the control gas branch pipe.
5. The oil filtration system with the magnetic filter as claimed in claim 4, wherein: a fourth pneumatic valve is arranged on the slag oil pipe, and a fifth pneumatic valve is arranged on the oil outlet pipe; the control air branch pipe is connected with the fourth pneumatic valve, and a control air sub-branch pipe communicated with the fifth pneumatic valve is connected to the control air branch pipe; the fourth pneumatic valve and the fifth pneumatic valve are respectively of a normally open type and a normally closed type, or the fourth pneumatic valve and the fifth pneumatic valve are respectively of a normally closed type and a normally open type.
6. The oil filtration system with the magnetic filter of claim 4, wherein: the back blowing air source is communicated with compressed air with the pressure of 3.5-4 bar, and the control air source is communicated with compressed air with the pressure of 6 bar.
7. The oil filtration system with the magnetic filter of claim 1, wherein: the oil outlet is arranged at the top of the filtering tank; the branch back-blowing air pipe is communicated with the slag oil pipe; the main back-blowing air pipe is communicated with the oil outlet pipe; the slag scraper is characterized in that outlets of the slag oil pipe and the exhaust pipe are arranged in the slag scraper, and the exhaust pipe is communicated with the atmosphere through a safety valve.
8. A method of filtering oil with a magnetic filter, comprising the oil filtering system with a magnetic filter according to any one of claims 1 to 7; the method is characterized by comprising an external circulation filtering method, wherein the external circulation filtering method comprises the following steps:
1.1) scrap iron separation: cooling oil recovered from processing equipment is sent to a magnetic filter through the first oil return pipeline by the oil return pump, scrap iron is separated from the cooling oil by the magnetic filter, and the cooling oil after the scrap iron is separated by the magnetic filter is sent to the dirty oil area through a second oil return pipeline; scrap iron obtained by the separation of the magnetic filter is sent to a slag scraper;
1.2) filtering: the cooling oil in the dirty oil area is sent into the filter tank through a filter pump to be filtered, a filter element for filtering the cooling oil is arranged in the filter tank, the cooling oil filtered by the filter element is discharged through an oil outlet formed in the top of the filter tank, and is sent into an oil purification area through an oil outlet pipe;
1.3) oil supply: sending the cooling oil in the oil purification area to processing equipment for recycling through an oil supply pump;
it also includes a method of decontamination, which is performed periodically or non-periodically to remove the residual oil deposited in the filtration tank, the method of decontamination including the steps of:
2.1) blowing foam: blowing high-pressure gas into the filter tank through a residual oil outlet at the bottom of the filter tank so as to form bubbles in residual oil, thereby reducing the adsorption force of the residual oil on a filter element of the filter tank and on the inner wall of the filter tank; the blown high-pressure gas is discharged from an exhaust port arranged at the upper part of the filter tank, the exhaust port is connected with an exhaust pipe, and an outlet of the exhaust pipe is arranged in the slag scraper;
2.2) back flushing residual oil: introducing high-pressure gas into the filtering tank through the oil outlet, discharging the blown high-pressure gas from the inside of the filter element to the outside of the filter element so as to press residual oil in the filtering tank to be discharged through the residual oil outlet, and sending the residual oil into the residue scraping machine through a residue oil pipe;
2.3) scrape the sediment, be provided with the driving chain in scraping the sediment machine, the driving chain by scrape the bottom of sediment machine and extend to setting up to scrape the slag discharging opening at sediment machine top, two be provided with a plurality of scraper blade between the driving chain, scrape the sediment machine and start regularly or irregularly the driving chain to with scrape the interior silted residual oil of sediment machine and discharge to the slag discharging opening.
9. The method for filtering oil with a magnetic filter according to claim 8, wherein: the method also comprises an internal circulation filtering method, wherein the internal circulation filtering method comprises the following steps:
3.1) the oil return pump sends the cooling oil in the dirty oil area into the magnetic filter through an oil return branch pipe; scrap iron is separated from the cooling oil by the magnetic filter, and the cooling oil after the scrap iron is separated by the magnetic filter is sent to the dirty oil area through the second oil return pipeline; scrap iron obtained by the separation of the magnetic filter is sent to a slag scraper; the oil return branch pipe is communicated with the first oil return pipeline through a proportional valve; the proportional valve is opened under the condition that the oil supply of the processing equipment is insufficient, and is closed under the condition that the oil supply of the processing equipment is sufficient.
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| KR20010065257A (en) * | 1999-12-29 | 2001-07-11 | 이구택 | Filter device which can exclude easily iron and sludge in grinding oil |
| CN202700649U (en) * | 2012-06-11 | 2013-01-30 | 苏州永添设备有限公司 | Multifunctional gear grinding machine oil cooling and filtering equipment |
| CN205977285U (en) * | 2016-08-22 | 2017-02-22 | 中节能（北京）节能环保工程有限公司 | Turbo -engine lube circulation cleaning system |
| CN214487351U (en) * | 2020-11-12 | 2021-10-26 | 创硕过滤设备（昆山）有限公司 | Magnetic separation device for oil treatment |
| CN214485866U (en) * | 2020-11-12 | 2021-10-26 | 创硕过滤设备（昆山）有限公司 | Oil filtration system of integrated form |
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