CN207534110U - A kind of spark-erosion machine tool with purifier - Google Patents
A kind of spark-erosion machine tool with purifier Download PDFInfo
- Publication number
- CN207534110U CN207534110U CN201721674335.7U CN201721674335U CN207534110U CN 207534110 U CN207534110 U CN 207534110U CN 201721674335 U CN201721674335 U CN 201721674335U CN 207534110 U CN207534110 U CN 207534110U
- Authority
- CN
- China
- Prior art keywords
- purifier
- spark
- machine tool
- babinet
- erosion machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000009760 electrical discharge machining Methods 0.000 title claims abstract description 22
- 230000001681 protective effect Effects 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 239000003426 co-catalyst Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 description 18
- 230000000505 pernicious effect Effects 0.000 description 13
- 239000003921 oil Substances 0.000 description 10
- 238000003754 machining Methods 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 description 6
- 239000004744 fabric Substances 0.000 description 5
- 229960004424 carbon dioxide Drugs 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- GOPYZMJAIPBUGX-UHFFFAOYSA-N [O-2].[O-2].[Mn+4] Chemical class [O-2].[O-2].[Mn+4] GOPYZMJAIPBUGX-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Abstract
The utility model discloses a kind of spark-erosion machine tools with purifier, including rack, oil groove and the column being arranged in rack, its key points of the technical solution are that being provided with purifier in the rack, the purifier includes exhaust fan, air intake duct, purifying box and exhaust pipe；The exhaust fan is fixed on the lateral wall of oil groove, and one end of the air intake duct is connected with the gas outlet of exhaust fan, and the other end connects setting with the upper end of purifying box, and the exhaust pipe connects setting with the lower end of purifying box；The protective cover that Open Side Down is arranged on the column, telescoping tube is provided with and communicated between the protective cover and the air inlet of exhaust fan；Several purifying boards are placed in the purifying box.Gas in protective cover is transported in purifying box and carries out purified treatment by exhaust fan, has achieved the purpose that mitigate and operator is damaged.
Description
Technical field
The utility model is related to spark-erosion machine tool apparatus field, more specifically, it relates to a kind of with purifier
Spark-erosion machine tool.
Background technology
Electric machining is using a kind of processing method of the electric discharge corrosion effect between electrode and workpiece, generally uses high frequency arteries and veins
It discharges on refunds road.
Existing Authorization Notice No. is that the Chinese patent of CN203664880U discloses a kind of work of large-scale spark-erosion machine tool
Liquid bath, including liquid bath body.Suitable kerosene or machine oil are contained in liquid bath body, to workpiece carry out electric machining when, need by
Workpiece is placed in liquid bath body.
But the gas and steam of liquid medium, shape can be continuously released when being processed in kerosene or machine oil in air
Gush out into bubble and float on liquid surface.It can become countless smog risings four when bubble is in explosion to dissipate, and contain in these bubbles
Metallic ore substance.The pernicious gas discharged during electric machining can adversely affect the health of operator.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of electrical fires with purifier
Flower lathe, has the advantage for mitigating and being damaged to operator.
To achieve the above object, the utility model provides following technical solution：
A kind of spark-erosion machine tool with purifier, including rack, oil groove and the column being arranged in rack, the machine
Purifier is provided on frame, the purifier includes exhaust fan, air intake duct, purifying box and exhaust pipe；The exhaust fan is consolidated
It is scheduled on the lateral wall of oil groove, one end of the air intake duct is connected with the gas outlet of exhaust fan, the upper end of the other end and purifying box
Portion's connection setting, the exhaust pipe connect setting with the lower end of purifying box；The protection that Open Side Down is arranged on the column
Cover, telescoping tube is provided with and communicated between the protective cover and the air inlet of exhaust fan；If it is placed with clean in the purifying box
Plate.
By using above-mentioned technical proposal, when carrying out electric machining to workpiece, the pernicious gas of oily tank liquid release into
Enter in protective cover, the pernicious gas in protective cover is pumped into inside air intake duct by exhaust fan by telescoping tube.Air intake duct arranges gas
It puts into inside purifying box, several purifying boards is placed in purifying box, pernicious gas is discharged after purifying board purifies through exhaust pipe.
The pernicious gas generated using purifying box to electric machining is filtered and is discharged after purifying, so as to alleviate pernicious gas to operation
The influence of person's health.
Further, the protective cover and column are slidably connected, and the upper end of the protective cover is provided with clip.
By using above-mentioned technical proposal, according to the position of liquid adjusting protecting cover held inside oil groove so that protection
There are certain spacing for the lower end of cover and liquid level.Protective cover and column are consolidated using clip after the position of protective cover is adjusted
It is fixed.It will be arranged to be adjusted between protective cover and column, the spacing between protective cover and liquid level can be controlled；It on the one hand can be so that electricity
The pernicious gas generated is processed as far as possible to enter inside protective cover；On the other hand damage of the high-temp liquid to protective cover can be reduced
Wound.
Further, the protective cover is in horn-like setting.
By using above-mentioned technical proposal, protective cover is arranged to the horn-like contact surface for increasing protective cover and liquid level
Product so that pernicious gas as much as possible can enter inside protective cover.
Further, the purifying box includes babinet and with babinet hinged chamber door of the side wall equipped with opening, the chamber door
Locking part is provided between babinet.
It, will be between chamber door and babinet when purifying board needs replacing after long-term use by using above-mentioned technical proposal
Locking part release after open chamber door, will be placed on box house purifying board take out replace.
Further, the locking part includes the extension bar being arranged on purifying box and the rotation being rotatably arranged on chamber door
Bar；The card slot of inlay card extension bar is offered in the rotating bar.
By using above-mentioned technical proposal, after chamber door is closed, rotary motion bar causes the complete inlay card of extension bar in card slot
Inside, so as to which chamber door and babinet be fixed.By the way that extension bar inlay card in card slot, can both be realized to consolidating for chamber door and babinet
It is fixed, while facilitate fixation and the opening of chamber door.
Further, it is provided with handle on the chamber door.
By using above-mentioned technical proposal, setting handle, which facilitates, on chamber door opens chamber door.
Further, Anti-slip cover is arranged on the handle, several anti-skid bulges are provided on the Anti-slip cover.
By using above-mentioned technical proposal, Anti-slip cover and anti-skid bulge on handle are set, palm and handle can be increased
Between stiction, facilitate and open chamber door.
Further, the purifying board includes several active carbon slabs and the carbon monoxide being arranged between adjacent active carbon slab
Catalyst plates.
By using above-mentioned technical proposal, activated carbon has stronger adsorptivity, can adsorb short grained impurity and harmful gas
Body.The Oxidation of Carbon Monoxide that liquid generates at high temperature can be carbon dioxide by CO catalyst, so as to reduce harmful gas
The discharge of body.The discharge capacity of pernicious gas in exhaust pipe is reduced by active carbon slab and CO catalyst plate, and then reduction has
Influence of the evil gas to operator's health.
Further, the purifying board is provided with fin close to the side wall protrusion of babinet, and the fin edge is vertical with chamber door
Direction be extended；The babinet offers the groove coordinated with fin.
By using above-mentioned technical proposal, when purifying board is mounted on box house, by by fin inlay card in groove
Inside can limit the moving direction of purifying board.
Further, the babinet has baffle close to the end set of groove, and the baffle and babinet are detachably connected.
By using above-mentioned technical proposal, purifying board is mounted on after box house, fin is fixed on groove using baffle
Inside, so as to which purifying board and babinet be fixed.
In conclusion the utility model has the advantages that：
1st, purified treatment is carried out by setting purifier that the pernicious gas that electric machining generates is drawn into inside purifying box,
So as to reduce the damage to operator；
2nd, by setting the protective cover and telescoping tube that are slidably connected with column, by the pernicious gas that electric machining generates adsorb into
Inside protective cover, reduce the diffusion of pernicious gas, so as to reduce the damage to operator；
3rd, it by the CO catalyst plate for setting active carbon slab and being spaced apart with active carbon slab, is inhaled using activated carbon
Oxidation of Carbon Monoxide in gas is carbon dioxide by the little particle impurity in attached gas, CO catalyst；So as to reduce
Damage to operator.
Description of the drawings
Fig. 1 is the overall schematic of the spark-erosion machine tool with purifier in embodiment；
Fig. 2 is the sectional view of the spark-erosion machine tool with purifier in embodiment；
Fig. 3 is the enlarged drawing of part A in Fig. 2；
Fig. 4 is the enlarged drawing of part B in Fig. 3；
Fig. 5 is the enlarged drawing of C portion in Fig. 3；
Fig. 6 is the overall schematic of purifying box in embodiment；
Fig. 7 is the enlarged drawing of D parts in Fig. 4；
Fig. 8 is the explosive view of purifying box in embodiment.
In figure：1st, rack；11st, column；12nd, main tapping；13rd, tool-electrode；14th, oil groove；2nd, protective cover；21st, clip；3、
Telescoping tube；4th, exhaust fan；41st, air inlet；42nd, gas outlet；5th, air intake duct；6th, purifying box；61st, chamber door；611st, handle；612nd, prevent
Sliding sleeve；6121st, anti-skid bulge；62nd, locking part；621st, extension bar；622nd, rotating bar；6221st, card slot；6222nd, dead axle；63rd, case
Body；64th, groove；65th, baffle；66th, sunk screw；7th, purifying board；71st, active carbon slab；72nd, CO catalyst plate；73rd, it is convex
Rib；8th, exhaust pipe.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
This specific embodiment is only explanation to the utility model, is not the limitation to the utility model, ability
Field technique personnel can as needed make the present embodiment the modification of no creative contribution after this specification is read, but
As long as it is all protected in the right of the utility model by Patent Law.
Embodiment：
A kind of spark-erosion machine tool with purifier referring to Figures 1 and 2, including rack 1 and is welded in rack 1
Column 11.The rotated down of column 11 is provided with main tapping 12, and the one end of main tapping 12 far from column 11 is fixed with tool electricity
Pole 13.The lower section that rack 1 is located at column 11 is provided with oil groove 14, and the liquid of certain altitude is contained in oil groove 14.To workpiece into
It during row electric machining, needs to immerse workpiece in liquid, while galvanic corrosion processing is carried out to workpiece using tool-electrode 13.
Referring to Figures 1 and 2, the lower end of column 11 is arranged with protective cover 2, and protective cover 2 and column 11 are slidably connected.According to
Protective cover 2, is then fixed on column 11 by the height of the height adjusting protecting cover 2 of liquid level in oil groove 14.Prevent in the present embodiment
It is fixedly connected between shield 2 and column 11 by clip 21.In order to increase the contact area of protective cover 2 and gas, protective cover 2 is set
It is set to horn-like.
With reference to Fig. 3 and Fig. 4, purifier is provided in rack 1, purifier includes air intake duct 5, exhaust pipe 8, is fixed on
The exhaust fan 4 of 14 outer wall of oil groove and the purifying box 6 being placed in rack 1.One end of air intake duct 5 and the gas outlet 42 of exhaust fan 4
Connection, the other end plug into 6 upper end of purifying box and connect setting with purifying box 6.Exhaust pipe 8 is plugged into purifying box 6 simultaneously
Lower end simultaneously connects setting with purifying box 6.
With reference to Fig. 3 and Fig. 4, it is provided with and communicated with telescoping tube 3 between protective cover 2 and exhaust fan 4, telescoping tube 3 in the present embodiment
It is set as bellows.One end of telescoping tube 3 is connected with the inside of protective cover 2, and the other end is plugged into the air inlet 41 of exhaust fan 4
Setting is connected with exhaust fan 4.
With reference to Fig. 5 and Fig. 6, purifying box 6 includes side wall and is equipped with the babinet 63 of opening and the chamber door 61 hinged with babinet 63, this
Chamber door 61 and babinet 63 are rotatablely connected by hinge in embodiment.Chamber door 61 one end and babinet 63 far from hinge pass through locking part
62 are fixedly connected.And the both ends of the surface that chamber door 61 and babinet 63 contact with each other can ensure certain leakproofness.
With reference to Fig. 7, locking part 62 includes the extension bar 621 for being fixed on 63 side wall of babinet and turns with what extension bar 621 coordinated
Lever 622.Chamber door 61 is welded with dead axle 6222 close to the lateral wall of extension bar 621, and rotating bar 622 is set in the outer of dead axle 6222
It is rotatablely connected on wall with chamber door 61.The card slot 6221 of inlay card extension bar 621, the bottom of card slot 6221 are offered in rotating bar 622
It is interference fitted with extension bar 621；For convenience by 621 inlay card of extension bar inside card slot 6221, the opening of card slot 6221 is in
Chamfering is set.
With reference to Fig. 7, chamber door 61 is welded with handle 611 close to the lateral wall of dead axle 6222, Anti-slip cover is arranged on handle 611
612.612 preferred rubber set of Anti-slip cover in the present embodiment.Anti-slip cover 612, which protrudes above, is provided with several anti-skid bulges 6121, this reality
It applies anti-skid bulge 6121 in example and is arranged to hemispherical, may be arranged as cylinder.
It is slided with reference to Fig. 8, in babinet 63 and is provided with several purifying boards 7, purifying board 7 includes active carbon slab 71 and carbon monoxide
Catalyst plates 72.Active carbon slab 71 and CO catalyst plate 72 are arranged at intervals, and active carbon slab 71 and catalyzing carbon monoxide
Agent plate 72 contacts with each other.In the present embodiment, the upper surface and lower face of active carbon slab 71 and CO catalyst plate 72 have
Water-proof breathable fabric is made, and Water-proof breathable fabric is combined by polytetrafluoroethylene film and cloth.Active carbon slab 71 is upper
Activated carbon is filled between lower two layers of Water-proof breathable fabric.CO catalyst plate 72 is in upper and lower two layers of Water-proof breathable fabric
Between be filled with hopcalite agent.Hopcalite agent be by activated manganese dioxide and copper oxide by a certain percentage made of graininess
Catalyst.
With reference to Fig. 8, purifying board 7 is provided with fin 73 close to the inner wall protrusion of babinet 63, babinet 63 offer it is several with it is convex
The groove 64 that rib 73 coordinates.Fin 73 is far from chamber door 61（With reference to Fig. 5）Bottom and babinet 63 inner wall contact, fin 73 is close
There are a certain distance for the end face of chamber door 61 and the end face of babinet 63；And the length of groove 64 is identical with the length of fin 73.
With reference to Fig. 8, groove 64 is close to chamber door 61（With reference to Fig. 5）One end be provided with baffle 65, baffle 65 in the present embodiment
It is fixed with babinet 63 by sunk screw 66.
Operation principle is as follows：
Workpiece is placed on 14 inside of oil groove first and injects certain liquid to the inside of oil groove 14, then according to liquid level
The position of protective cover 2 is highly adjusted, and passes through clip 21 and is fixedly connected with protective cover 2 with column 11.
Then start spark-erosion machine tool and exhaust fan 4 works, the pernicious gas generated during electric machining is inhaled into protection
Inside cover 2, and pass through inside telescoping tube 3 and the entrance air intake duct 5 of exhaust fan 4.Gas inside air intake duct 5 enters purifying box 6
Upper end, then the gas inside purifying box 6 pass sequentially through spaced active carbon slab 71 and CO catalyst plate 72
It flow to the lower end of purifying box 6.Then purified gas is discharged through exhaust pipe 8.Gas is by active carbon slab 71 and one
During carbonoxide catalyst plates 72, the activated carbon that the little particle impurity of gas interior is filled in inside active carbon slab 71 is inhaled
It is attached.The hopcalite that carbon monoxide in gas is filled in inside CO catalyst plate 72 is oxidized to carbon dioxide.
Spark-erosion machine tool is suspended after work pieces process, then suspends exhaust fan 4.
Claims (10)
1. a kind of spark-erosion machine tool with purifier, including rack（1）, oil groove（14）Be arranged on rack（1）On it is vertical
Column（11）, it is characterised in that：The rack（1）On be provided with purifier, the purifier includes exhaust fan（4）, air-breathing
Pipe（5）, purifying box（6）And exhaust pipe（8）；The exhaust fan（4）It is fixed on oil groove（14）Lateral wall on, the air intake duct
（5）One end and exhaust fan（4）Gas outlet（42）Connection, the other end and purifying box（6）Upper end connection setting, the row
Tracheae（8）And purifying box（6）Lower end connection setting；The column（11）On be arranged with the protective cover that Open Side Down（2）, institute
State protective cover（2）And exhaust fan（4）Air inlet（41）Between be provided with and communicated with telescoping tube（3）；The purifying box（6）Interior placement
There are several purifying boards（7）.
2. the spark-erosion machine tool according to claim 1 with purifier, it is characterised in that：The protective cover（2）With
Column（11）It is slidably connected, the protective cover（2）Upper end be provided with clip（21）.
3. the spark-erosion machine tool according to claim 2 with purifier, it is characterised in that：The protective cover（2）It is in
Horn-like setting.
4. the spark-erosion machine tool according to claim 1 with purifier, it is characterised in that：The purifying box（6）Packet
Include the babinet that side wall is equipped with opening（63）With with babinet（63）Hinged chamber door（61）, the chamber door（61）And babinet（63）Between
It is provided with locking part（62）.
5. the spark-erosion machine tool according to claim 4 with purifier, it is characterised in that：The locking part（62）Packet
It includes and is arranged on babinet（63）On extension bar（621）Be rotatably arranged on chamber door（61）On rotating bar（622）；The rotating bar
（622）On offer inlay card extension bar（621）Card slot（6221）.
6. the spark-erosion machine tool according to claim 5 with purifier, it is characterised in that：The chamber door（61）On set
It is equipped with handle（611）.
7. the spark-erosion machine tool according to claim 6 with purifier, it is characterised in that：The handle（611）On
It is arranged with Anti-slip cover（612）, the Anti-slip cover（612）On be provided with several anti-skid bulges（6121）.
8. the spark-erosion machine tool according to claim 4 with purifier, it is characterised in that：The purifying board（7）Packet
Include several active carbon slabs（71）Be arranged on adjacent active carbon slab（71）Between CO catalyst plate（72）.
9. the spark-erosion machine tool according to claim 8 with purifier, it is characterised in that：The purifying board（7）It leans on
Nearly babinet（63）Side wall protrusion be provided with fin（73）, the fin（73）Edge and chamber door（61）Vertical direction extension is set
It puts；The babinet（63）It offers and fin（73）The groove of cooperation（64）.
10. the spark-erosion machine tool according to claim 9 with purifier, it is characterised in that：The babinet（63）It leans on
Nearly groove（64）End set have baffle（65）, the baffle（65）And babinet（63）It is detachably connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721674335.7U CN207534110U (en) | 2017-12-05 | 2017-12-05 | A kind of spark-erosion machine tool with purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721674335.7U CN207534110U (en) | 2017-12-05 | 2017-12-05 | A kind of spark-erosion machine tool with purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207534110U true CN207534110U (en) | 2018-06-26 |
Family
ID=62616950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721674335.7U Expired - Fee Related CN207534110U (en) | 2017-12-05 | 2017-12-05 | A kind of spark-erosion machine tool with purifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207534110U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453602A (en) * | 2020-11-23 | 2021-03-09 | 江苏德瑞加数控机床有限公司 | Spark machine tool for producing metal parts |
| CN112496477A (en) * | 2020-12-26 | 2021-03-16 | 景荣精密模具(深圳)有限公司 | Electric spark machine with smoke abatement function |
| CN112959131A (en) * | 2021-03-05 | 2021-06-15 | 宁波工程学院 | Electric spark forming processing device |
-
2017
- 2017-12-05 CN CN201721674335.7U patent/CN207534110U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453602A (en) * | 2020-11-23 | 2021-03-09 | 江苏德瑞加数控机床有限公司 | Spark machine tool for producing metal parts |
| CN112453602B (en) * | 2020-11-23 | 2022-04-05 | 江苏德瑞加数控机床有限公司 | Spark machine tool for producing metal parts |
| CN112496477A (en) * | 2020-12-26 | 2021-03-16 | 景荣精密模具(深圳)有限公司 | Electric spark machine with smoke abatement function |
| CN112496477B (en) * | 2020-12-26 | 2022-03-11 | 景荣精密模具(深圳)有限公司 | Electric spark machine with smoke abatement function |
| CN112959131A (en) * | 2021-03-05 | 2021-06-15 | 宁波工程学院 | Electric spark forming processing device |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180626 |