CN201261097Y - Wire-electrode cutting operation liquid foreign body separator - Google Patents
Wire-electrode cutting operation liquid foreign body separator Download PDFInfo
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- CN201261097Y CN201261097Y CNU2008201629129U CN200820162912U CN201261097Y CN 201261097 Y CN201261097 Y CN 201261097Y CN U2008201629129 U CNU2008201629129 U CN U2008201629129U CN 200820162912 U CN200820162912 U CN 200820162912U CN 201261097 Y CN201261097 Y CN 201261097Y
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- magnetic adsorption
- impurity
- adsorption piece
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Abstract
The utility model relates to a working solution impurity separator with linear cutting, which comprises a box body provided with a solution inlet and a solution outlet, wherein an impurity separation mechanism is arranged in the box body; the impurity separation mechanism comprises a rotating member which can be rotatably installed in the box body, one side of the rotating member is provided with a forced part corresponding to the solution inlet, and working solution flowing inside from the solution inlet impacts the forced part to drive the rotating member to rotate; a magnetic adsorption member is fixed on the circumferential edge of the rotating member, an impurity outlet is arranged on the upper part of the box body, a guided groove is arranged on the impurity outlet, and the head end of the guided groove is provided with a scraping knife which is in scrapping match with the magnetic adsorption member on the rotating member. Scrap iron and oil stain impurities in the working solution are adsorbed on the magnetic adsorption member; as the rotating member is rotated, when the magnetic adsorption member on which the scrap iron and the oil stain impurities are adsorbed rotates near the scraping knife, the impurities acted by the scraping knife are scrapped and are discharged out from the box body through the guided groove, thereby the automatic pollution discharge is realized.
Description
Technical field
The utility model belongs to the technical field of filter, relates in particular to a kind of wire-electrode cutting operation liquid foreign body separator.
Background technology
The line cutting working liquid will keep clean.Working solution is long service time, can make metal particle wherein become big gradually, the character of working solution is changed, reduce the effect of working solution, also can stop up cooling system, be in addition metal cutting bits in the working solution can be in process along with working solution the finished surface by workpiece repeatedly, will produce gap shorting like this has a strong impact on the machining accuracy of processing work and is easy to produce fracture of wire, thereby reduction working (machining) efficiency, so must filter to working solution, service time is long, change working solution.
There is patent also to disclose the filtration or the purifier of line cutting working liquid, as a patent No. is a kind of wire cutting machine tool working solution magnetization clarifier so the Chinese utility model patent " wire cutting machine tool working solution magnetization clarifier " of ZL02267807.7 (notification number is CN2557275Y) has disclosed, comprise casing, casing is provided with case lid, feed tube and drain pipe; It is characterized in that the purification magnetic core set is set in the casing, comprise fixed support and the plate shape strong magnets that is arranged in parallel, plate shape strong magnets is arranged in the fixed support; The inlet of drain pipe is positioned at the top of casing.
Be a kind of line cutting working liquid on-line filtration case so the Chinese utility model patent " line cutting working liquid on-line filtration case " of ZL200620090382.2 (notification number is CN2885477Y) has disclosed also as a patent No., it is characterized in that parallel being provided with slideway inserted the some dividing plates that are provided with in the casing, dividing plate upper edge and case lid spacing are provided with, between the adjacent separator, parallel with dividing plate, insert with slideway and to be fixed with the dividing plate that suspends, suspend at the bottom of dividing plate lower edge and upper edge and the case, the case lid spacing is provided with, and its upper edge is higher than the dividing plate upper edge and is provided with, constituted the line cutting working liquid runner that detours up and down, dividing plate and suspend evenly to embed on the dividing plate and be provided with some permanent magnets is positioned at the bottom of the case lid of this runner first and last end that detours and the case position and is respectively equipped with wire cutting liquid and returns liquid inlet and liquid outlet.
The structure of aforementioned two Patent publish all exist to need often purification assembly to be taken out, and clear up the impurity such as iron filings that adsorb on the purification assembly again, and it can not automatic scrap iron cleaning impurity, uses inconvenient.
At above-mentioned present situation, it is that the Chinese utility model patent " cutting fluid purification magnetic separator " of ZL200620026341.7 (notification number is CN2920411Y) has disclosed a kind of like this cutting fluid and purifies magnetic separator that one patent No. is arranged, and it is characterized in that: include liquid reserve tank, fixed head, draining plate, scraper plate, magnetic separtor, squeeze roll(s), motor, block terminal, extension spring, connecting plate, water inlet, delivery port and governor motion; Described two fixed heads are separately fixed on the lateral surface of liquid reserve tank both sides, the draining plate riveting is contained in the high end top of liquid reserve tank, scraper plate is installed on liquid reserve tank other end top, the axle of magnetic separtor is installed in respectively on the fixed head that studs with axle sleeve, one end is connected with the motor key, the squeeze roll(s) two ends are installed in respectively on the governor motion of fixed head, block terminal is fixed on the lateral surface of liquid reserve tank, the two ends of described extension spring are separately fixed at the medial surface of liquid reserve tank and the lateral surface of scraper plate, the connecting plate two ends make respectively on the upper surface that is fixed by bolts to two fixed heads, described water inlet is fixed on liquid reserve tank and the end face that draining plate is connected by bracing frame, and delivery port is fixed on the bottom of liquid reserve tank side.
This structure can be cleared up the iron filings impurity of separating automatically, but it is a lot of as motor, so complex structure and cost height also have aforementioned three patent inflows bigger to relate to parts, be that the water yield that need filter the unit interval is more, can not fully clean out the impurity in the working solution.
In sum, the purification or the separator of existing line cutting working liquid also can be further improved.
The utility model content
But technical problem to be solved in the utility model is the wire-electrode cutting operation liquid foreign body separator that impurity such as a kind of automatic scrap iron cleaning are provided at above-mentioned prior art present situation, and it also has the advantage simple and reasonable, that cost is low.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of wire-electrode cutting operation liquid foreign body separator, include casing, and this casing top is provided with inlet, and the bottom is provided with liquid outlet, and also is provided with impurity separating mechanism in the described casing; It is characterized in that: described impurity separating mechanism includes the rotatable tumbler that is installed in the casing, this tumbler one side has and the corresponding forced section of inlet, the working solution that flows into from inlet impacts this forced section and drives the tumbler rotation, the periphery of tumbler is fixed with the magnetic adsorption piece, described liquid outlet is positioned at the tumbler outside, described casing top is provided with the impurity outlet, this impurity outlet is provided with a guide groove, the end of described guide groove exposes the casing outside, the head end of guide groove is provided with scraper, and this scraper stretches into casing magnetic adsorption piece scraping interior and on the tumbler and cooperates.
Above-mentioned tumbler includes two rotating disks, this two rotating disk is installed in the rotating shaft at interval and can rotates with rotating shaft, the two ends of described rotating shaft are erected on the sidewall of casing front and back rotationally, between the inner face of sidewall spacing are arranged before and after described rotating disk outer face and the casing; Described magnetic adsorption piece is fixed on the periphery of one of them rotating disk in two rotating disks, described liquid outlet has one at least, be arranged between the rotating disk and respective side walls that is fixed with the magnetic adsorption piece, simultaneously, have the gap of flowing through for working solution between rotating disk outer peripheral face and the box perispore; Described impurity outlet is located at casing top and corresponding with the disk position that is fixed with the magnetic adsorption piece, and described scraper stretches into casing magnetic adsorption piece scraping interior and on the rotating disk and cooperates; Be fixed with the Sheng liquid cavity volume of a plurality of independences and opening between two rotating disks along the circle spacing, each is contained the liquid cavity volume and radially arranges, the inlet on the described casing is between two rotating disks and corresponding with described Sheng liquid cavity volume opening.Contain the liquid cavity volume owing between two rotating disks, be provided with, this Sheng liquid cavity volume is equivalent to the forced section of tumbler, after the working solution of containing the liquid cavity volume reaches certain gravity, containing the liquid cavity volume overturns with rotating disk, working solution flows out, under the effect of magnetic adsorption piece, iron filings in the working solution and greasy dirt impurity are adsorbed on the magnetic adsorption piece, flow out from liquid outlet through the working solution behind the isolation of purified and continue to use, simultaneously, another is contained the liquid cavity volume and continues to receive working solution, promptly respectively contain the intermittent continuous operation of liquid cavity volume, rotating disk also progressively rotates, therefore, this tumbler structure can be guaranteed only to clear up a working solution of containing liquid cavity volume capacity at every turn, makes the impurity in the working solution separate more thorough.
Certainly tumbler also can have only a rotating disk, is fixed with the structure of multi-disc blade in a side of rotating disk along circle configurations, and the similar water wheels of this structure, this tumbler also can adopt the structure of similar waterwheel.
Be to improve the efficient of removing impurities, the periphery of described two rotating disks all is fixed with the magnetic adsorption piece, described magnetic adsorption piece in the form of a ring, described liquid outlet has two, is arranged on the box perispore between each rotating disk and the respective side walls.Impurity in the working solution can separate by two rotating disks like this.
For ease of rotating disk and rotating shaft are fixed together, linking together by a central shaft between the two above-mentioned rotating disks constitutes integral piece, and described rotating shaft is arranged in described central shaft, like this with rotating shaft and central shaft by connected modes such as keyways, just rotating disk can be linked to each other with rotating shaft, easy to assembly; Be fixed with the demarcation strip that polylith is radially arranged along the circle spacing between two rotating disks, described Sheng liquid cavity volume is surrounded by adjacent two demarcation strips, two rotating disk inwalls and central shaft outer peripheral face, and described demarcation strip is curved, and each demarcation strip arc towards unanimity.Sheng liquid cavity volume in this structure makes full use of rotating disk inner face and central shaft side face, can guarantee to save material under the situation of identical Sheng liquid cavity volume as far as possible.
Above-mentioned liquid outlet is being good between the floor level face of dividing plate floor level face and rotating disk.And with close dividing plate floor level face is the best.So both can guarantee the smooth and easy of dial rotation, and also can make the impurity in the working solution that the time that is adsorbed onto fully on the magnetic adsorption piece is arranged.
For making the magnetic adsorption piece that more adsorption surface area be arranged, above-mentioned magnetic adsorption piece section is the U type, and this magnetic adsorption piece is coated on the periphery of rotating disk, correspondence, and described scraper is the U type, and described scraper is stuck in described magnetic adsorption piece outer surface.The absorption surface of magnetic adsorption piece has three places like this, is respectively left and right sides end face and side face, and this magnetic also can only have left and right sides end face certainly, or side face is only arranged.
For preventing that the impurity such as iron filings sump oil of scraper on cleaning magnetic adsorption piece from making, these impurity can splash everywhere, and above-mentioned impurity outlet top is fixed with an outer baffle.
For preventing to sputter from the impurity outlet with the working solution of filtration, be fixed with an Internal baffle in the casing between the two above-mentioned rotating disks, this Internal baffle position is corresponding to the impurity outlet to prevent that working solution from flowing out from the impurity outlet.
For ease of collecting impurity, the rear portion of above-mentioned casing also is connected with an impurity collecting chamber, and described guide groove end stretches in the impurity collecting chamber.
Compared with prior art, advantage of the present utility model is: during use, working solution enters from the inlet of casing, the driving tumbler rotates, simultaneously, iron filings in the working solution and greasy dirt impurity are adsorbed on the magnetic adsorption piece, liquid outlet outflow from the tumbler outside continues to use through the working solution behind the isolation of purified, because tumbler is rotating, in the time of near the magnetic adsorption piece that is adsorbed with iron filings and greasy dirt impurity turns to scraper, under the scraper effect, impurity is by hanging fascia, discharge outside the casing via guide groove, a course of work is finished.This structure is pure mechanical action in whole isolation of purified process, and it is auxiliary to need not additional power, and use cost is low; Also have this whole process impurity to be cleared up automatically, need not manual cleaning, easy to use.
Description of drawings
Fig. 1 is the perspective view of the utility model embodiment;
Fig. 2 is the perspective view (removing under the sidewall state of casing one side) of the utility model embodiment;
Fig. 3 is the structure cutaway view of the utility model embodiment;
Fig. 4 is that the A-A of Fig. 3 is to cutaway view;
Fig. 5 is that the B-B of Fig. 3 is to cutaway view;
Fig. 6 is the perspective view that scraper cooperates with tumbler among the utility model embodiment.
The specific embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Shown in Fig. 1～6, be a preferred embodiment of the present utility model.
A kind of wire-electrode cutting operation liquid foreign body separator includes casing 1, and this casing 1 is roughly cylindric, generally has metal material to make, and also is fixedly connected with an impurity collecting chamber 10 at the rear portion of described casing 1.
Described casing 1 top is provided with inlet 11, be inserted with feed tube 16 in the inlet 11, working solution is communicated in the casing 1, the bottom of casing 1 is provided with two liquid outlets 12, be inserted with drain pipe 17 on the liquid outlet 12, also be provided with impurity separating mechanism in the described casing 1.
Described impurity separating mechanism comprises tumbler, tumbler includes two rotating disks 3, link together by a central shaft 31 between two rotating disks 3 and constitute integral piece, one rotating shaft 4 is arranged in described central shaft 31, generally link together between rotating shaft 4 and the central shaft 31 by keyway arrangements, and the two ends of rotating shaft 4 are erected on the casing 1 front and back sidewall rotationally by bearing 18, and rotating disk 3 just can rotate with the rotation of rotating shaft 4 like this.
Between the inner face of described rotating disk 3 outer faces and casing 1 front and back sidewall space D is arranged, so rotating disk 3 outer faces, casing 1 perisporium and casing 1 front side wall or casing 1 rear wall constitute the space that can hold working solution, described two liquid outlets 12 are separately positioned between rotating disk 3 and the sidewall on casing 1 perisporium.
Simultaneously, rotating disk 3 outer peripheral faces and casing 1 have the gap X that flows through for working solution between perisporium.
The periphery of described each rotating disk 3 is fixed with magnetic adsorption piece 5 in the form of a ring, magnetic adsorption piece 5 sections are the U type, magnetic adsorption piece 5 is coated on the periphery of rotating disk 3, magnetic adsorption piece 5 can be that the magnet steel that itself has magnetic is made, can certainly be by making ringwise parts with permeability magnetic material, the section of these parts takes the shape of the letter U, and places a magnet ring in this components interior again, this magnet ring magnetizes this parts, makes these parts have magnetic.
Described casing 1 top is provided with two and exports 13 with the corresponding impurity in rotating disk 3 positions respectively, each impurity outlet 13 is provided with a guide groove 6, the end of described guide groove 6 exposes casing 1 outside also, the head end of guide groove 6 is provided with scraper 7, this scraper 7 is the U type, this scraper 7 stretches in the casing 1 and is stuck on the magnetic adsorption piece 5 on the rotating disk 3 and stretches in the impurity collecting chamber 10, and the cutting edge of scraper 7 is swiped with this magnetic adsorption piece 5 and cooperated; Export 13 tops at impurity and be fixed with an outer baffle 14, be fixed with an Internal baffle 15 in the casing 1 between two rotating disks 3, it is 13 corresponding to prevent that working solution from flowing out from impurity outlet 13 that these Internal baffle 15 positions and impurity export.
Between two rotating disks 3, be fixed with the demarcation strip 9 that polylith is radially arranged along the circle spacing, described each demarcation strip 9 is curved, and each demarcation strip 9 arc towards unanimity, and adjacent two demarcation strips 9, two rotating disks, 3 inwalls and central shaft 31 outer peripheral faces surround one and independently contain liquid cavity volume 8, like this because demarcation strip 9 has polylith, containing liquid cavity volume 8 successively also has a plurality of, and radially arrange, simultaneously, inlet 11 on the described casing 1 is between two rotating disks 3 and corresponding with described Sheng liquid cavity volume 8 openings, described liquid outlet 12 is good between the floor level face of dividing plate 9 floor level faces and rotating disk 3, and liquid outlet 12 is the best with close dividing plate 9 floor level faces.
Operation principle and the process of the utility model embodiment are as follows:
During use, working solution enters from the inlet 11 of casing 1, flow to and contain liquid cavity volume 8, after Sheng liquid cavity volume 8 reaches certain gravity, drive rotating disk 3 with its upset, after Sheng liquid cavity volume 8 is turned to the bottom, working solution in it flows out, working solution flows in the cavity between rotating disk 3 outer faces and casing 1 sidewall through the gap between rotating disk 3 and casing 1 perisporium, at this moment, under 5 effects of magnetic adsorption piece, iron filings in the working solution and greasy dirt impurity are adsorbed on the magnetic adsorption piece 5, flowing out continuation through the working solution behind the isolation of purified from liquid outlet 12 uses, simultaneously, another is contained liquid cavity volume 8 and continues the reception working solution, promptly respectively contains the 8 intermittent continuous operations of liquid cavity volume, rotating disk 3 also progressively rotates, in the time of near the magnetic adsorption piece 5 that is adsorbed with iron filings and greasy dirt impurity turns to scraper 7, under scraper 7 effects, impurity is by hanging fascia, in the impurity collecting chamber 10 outside the guide groove 6 discharge casings 1, a course of work is finished.
The protection domain of this wire-electrode cutting operation liquid foreign body separator is not limited to this embodiment, and as only on a rotating disk magnetic adsorption piece being set, the suitable distortion of structure of perhaps containing the liquid cavity volume also belongs to protection domain of the present utility model.
Claims (10)
1, a kind of wire-electrode cutting operation liquid foreign body separator includes casing (1), and this casing (1) top is provided with inlet (11), and the bottom is provided with liquid outlet (12), and also is provided with impurity separating mechanism in the described casing (1); It is characterized in that:
Described impurity separating mechanism includes the rotatable tumbler that is installed in the casing (1), this tumbler one side has and the corresponding forced section of inlet (11), the working solution that flows into from inlet (11) impacts this forced section and drives the tumbler rotation, the periphery of tumbler is fixed with magnetic adsorption piece (5), described liquid outlet (12) is positioned at the tumbler outside, described casing (1) top is provided with impurity outlet (13), this impurity outlet (13) is provided with a guide groove (6), the end of described guide groove (6) exposes casing (1) outside, the head end of guide groove (6) is provided with scraper (7), and this scraper (7) stretches into casing (1) magnetic adsorption piece (5) scraping interior and on the tumbler and cooperates.
2, wire-electrode cutting operation liquid foreign body separator according to claim 1, it is characterized in that: described tumbler includes two rotating disks (3), this two rotating disk (3) is installed in a rotating shaft (4) at interval and goes up and can rotate with rotating shaft (4), the two ends of described rotating shaft (4) are erected on the sidewall of casing (1) front and back rotationally, between the inner face of sidewall spacing (D) are arranged before and after described rotating disk (3) outer face and the casing (1);
Described magnetic adsorption piece (5) is fixed on the periphery of one of them rotating disk (3) in two rotating disks (3), described liquid outlet (12) has one at least, be arranged between the rotating disk (3) and respective side walls that is fixed with magnetic adsorption piece (5), simultaneously, has the gap of flowing through for working solution (X) between rotating disk (3) outer peripheral face and casing (1) perisporium;
Described impurity outlet (13) is located at casing (1) top and corresponding with the rotating disk that is fixed with magnetic adsorption piece (5) (3) position, and described scraper (7) stretches into casing (1) magnetic adsorption piece (5) scraping interior and on the rotating disk (3) and cooperates;
Between two rotating disks (3), be fixed with the Sheng liquid cavity volume (8) of a plurality of independences and opening along the circle spacing, each is contained liquid cavity volume (8) and radially arranges, the inlet (11) on the described casing (1) is positioned between two rotating disks (3) and is corresponding with described Sheng liquid cavity volume (8) opening.
3, wire-electrode cutting operation liquid foreign body separator according to claim 2, it is characterized in that: the periphery of described two rotating disks (3) all is fixed with magnetic adsorption piece (5), described magnetic adsorption piece (5) in the form of a ring, described liquid outlet (12) has two, is arranged on casing (1) perisporium between each rotating disk (3) and the respective side walls.
4, according to claim 2 or 3 described wire-electrode cutting operation liquid foreign body separators, it is characterized in that: linking together by a central shaft (31) between described two rotating disks (3) constitutes integral piece, described rotating shaft (4) is arranged in described central shaft (31), between two rotating disks (3), be fixed with the demarcation strip (9) that polylith is radially arranged along the circle spacing, described Sheng liquid cavity volume (8) is by adjacent two demarcation strips (9), two rotating disks (3) inwall and central shaft (31) outer peripheral face surround, and described demarcation strip (9) is curved, and each demarcation strip (9) arc towards unanimity.
5, wire-electrode cutting operation liquid foreign body separator according to claim 4 is characterized in that: described liquid outlet (12) is positioned between the floor level face of dividing plate (9) floor level face and rotating disk (3).
6, wire-electrode cutting operation liquid foreign body separator according to claim 5 is characterized in that: the floor level face that described liquid outlet (12) closes on dividing plate (9) is provided with.
7, wire-electrode cutting operation liquid foreign body separator according to claim 3, it is characterized in that: described magnetic adsorption piece (5) section is the U type, this magnetic adsorption piece (5) is coated on the periphery of rotating disk (3), corresponding, described scraper (7) is the U type, and described scraper (7) is stuck in described magnetic adsorption piece (5) outer surface.
8, wire-electrode cutting operation liquid foreign body separator according to claim 4 is characterized in that: described impurity outlet (13) top is fixed with an outer baffle (14).
9, wire-electrode cutting operation liquid foreign body separator according to claim 4, it is characterized in that: be fixed with an Internal baffle (15) in the casing (1) between described two rotating disks (3), this Internal baffle (15) position is corresponding to impurity outlet (13) to prevent that working solution from flowing out from impurity outlet (13).
10, according to the described wire-electrode cutting operation liquid foreign body separator of arbitrary claim in the claim 1～3, it is characterized in that: the rear portion of described casing (1) also is connected with an impurity collecting chamber (10), and described guide groove (6) end stretches in the impurity collecting chamber (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201629129U CN201261097Y (en) | 2008-08-15 | 2008-08-15 | Wire-electrode cutting operation liquid foreign body separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201629129U CN201261097Y (en) | 2008-08-15 | 2008-08-15 | Wire-electrode cutting operation liquid foreign body separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201261097Y true CN201261097Y (en) | 2009-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201629129U Expired - Lifetime CN201261097Y (en) | 2008-08-15 | 2008-08-15 | Wire-electrode cutting operation liquid foreign body separator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201261097Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728914A (en) * | 2012-06-28 | 2012-10-17 | 宁波市镇海怡福莱文化创意有限公司 | Rotation filter |
| CN103056032A (en) * | 2013-01-28 | 2013-04-24 | 唐山晶玉科技有限公司 | Connection machine for magnetic-mud separation and magnetic-mud separating method |
| CN108296497A (en) * | 2016-11-17 | 2018-07-20 | 慈溪润德机械制造有限公司 | A kind of lathe structure |
-
2008
- 2008-08-15 CN CNU2008201629129U patent/CN201261097Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728914A (en) * | 2012-06-28 | 2012-10-17 | 宁波市镇海怡福莱文化创意有限公司 | Rotation filter |
| CN103056032A (en) * | 2013-01-28 | 2013-04-24 | 唐山晶玉科技有限公司 | Connection machine for magnetic-mud separation and magnetic-mud separating method |
| CN103056032B (en) * | 2013-01-28 | 2015-05-20 | 唐山晶玉科技有限公司 | Connection machine for magnetic-mud separation and magnetic-mud separating method |
| CN108296497A (en) * | 2016-11-17 | 2018-07-20 | 慈溪润德机械制造有限公司 | A kind of lathe structure |
| CN108296497B (en) * | 2016-11-17 | 2020-04-17 | 慈溪润德机械制造有限公司 | Lathe structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080815 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |