CN206912419U - A kind of selfreparing line electrode spark cutting device - Google Patents
A kind of selfreparing line electrode spark cutting device Download PDFInfo
- Publication number
- CN206912419U CN206912419U CN201720269389.9U CN201720269389U CN206912419U CN 206912419 U CN206912419 U CN 206912419U CN 201720269389 U CN201720269389 U CN 201720269389U CN 206912419 U CN206912419 U CN 206912419U
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- Prior art keywords
- line electrode
- solidification equipment
- selfreparing
- cutting device
- coating unit
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- 238000005520 cutting process Methods 0.000 title claims abstract description 31
- 238000007711 solidification Methods 0.000 claims abstract description 59
- 230000008023 solidification Effects 0.000 claims abstract description 59
- 238000000576 coating method Methods 0.000 claims abstract description 46
- 239000011248 coating agent Substances 0.000 claims abstract description 45
- 238000003754 machining Methods 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 28
- 239000004020 conductor Substances 0.000 claims abstract description 26
- 239000011247 coating layer Substances 0.000 claims abstract description 17
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 16
- 239000012224 working solution Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000003252 repetitive effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005021 gait Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The utility model discloses a kind of selfreparing line electrode spark cutting device, including line electrode, coating unit and solidification equipment；Wherein, coating unit is used to coat conductor fluid on line electrode；Solidification equipment is used to make conductor fluid be solidificated in formation conductive coating layer on line electrode surface；When in use, line electrode passes through coating unit and solidification equipment successively, make to form conductive coating layer outside line electrode, subsequent line electrode is marched at workpiece to be processed, electro-discharge machining is carried out between conductive coating layer and workpiece to be processed, line electrode coat produces loss after electric discharge, and line electrode does not participate in electro-discharge machining directly substantially in itself, the intensity and diameter dimension of line electrode can keep constant, so as to be not easy fracture of wire, the present apparatus can also be by changing the direct of travel of line electrode to line electrode repetitive coatings and curing conductive fluid, realize the recycling of line electrode, processing cost is reduced while machining accuracy is ensured, save the time for changing line electrode, improve efficiency.
Description
Technical field
Machining equipment technical field is the utility model is related to, more particularly to a kind of selfreparing line electrode spark cutting
Device.
Background technology
Wire EDM is widely used in the cutting processing field of superhard material, and the processing method has not by workpiece
The advantages that material hardness influences, machining accuracy is high, cleavable complex-shaped part, be process superhard material effective ways it
One.
In the prior art, when carrying out Wire EDM, because spark discharge effect is while workpiece material is removed,
The loss of line electrode is also resulted in, therefore lasting discharge loss not only influences machining accuracy, but also fracture of wire can be caused so that
Process is interrupted, and causes scrapping for undressed complete product, increases production cost.And in the processed of slow wire feeding electric discharge cutting
Cheng Zhong, due to discharge loss, for line electrode only using once just scrapping, this undoubtedly causes great waste.
Therefore, how a kind of selfreparing line electrode spark cutting device is provided, grows line electrode service life thereon,
Machining accuracy is high, and workpiece scrappage is low, reduces processing cost, turns into those skilled in the art's important technology urgently to be resolved hurrily and ask
Topic.
Utility model content
In view of this, the utility model provides a kind of selfreparing line electrode spark cutting device, is made thereon with reaching
Line electrode service life length, machining accuracy is high, reduces the purpose of processing cost.
To achieve the above object, the utility model provides following technical scheme：
A kind of selfreparing line electrode spark cutting device, including：
The line electrode reciprocally advanced；
For to the first coating unit and the second coating unit that conductor fluid is coated on the line electrode；
The first solidification equipment of conductive coating layer is formed on the line electrode surface for being solidificated in the conductor fluid
With the second solidification equipment.
Preferably, in addition to lathe, the upper silk cylinder reciprocally rotated and lower silk cylinder, the line electricity are provided with the lathe
Pole is located between the upper silk cylinder and the lower silk cylinder.
Preferably, in addition to can be relative to the workbench of the machine tool motion, the workbench is used to carry and clamp to treat
Workpieces processing.
Preferably, the guide wheel for adjusting the line electrode trend is additionally provided with the lathe.
Preferably, the first guide wheel and the second guide wheel, first guide wheel and the upper silk cylinder are provided with the lathe
Between be provided with first coating unit and first solidification equipment, set between second guide wheel and the lower silk cylinder
There are second coating unit and second solidification equipment.
Preferably, first coating unit and the second coating unit are the tank for being contained with the conductor fluid, described
The through hole for being available for the line electrode to pass through is offered in two relative side walls of tank, and the through hole is located at the electrical conduction current
Under body fluid face, wherein the through hole on the first coating unit close to first solidification equipment coordinates with the line electrode gap,
Through hole away from first solidification equipment with the line electrode is micro- is engaged, two through-hole structures of the second coating unit and
The through hole of first coating unit is identical；When line electrode is advanced from the downward silk cylinder direction of upper silk cylinder, the work of the first solidification equipment, the
Two solidification equipments do not work；When line electrode is advanced from the upward silk cylinder direction of lower silk cylinder, the work of the second solidification equipment, the first solidification
Device does not work.
Preferably, the main body of the conductor fluid is conductive silver paste, conductive copper paste, conductive carbon paste or electrically conductive ink, auxiliary
Body is light curing agent.
Preferably, first solidification equipment and the second solidification equipment are ultraviolet curing device or the device that is heating and curing.
Preferably, in addition to for machining area supply working solution work liquid supply unit.
Preferably, the work liquid supply unit includes being used to hold the liquid bath of the working solution, for extracting the work
The nozzle made the delivery pump of liquid and be connected with the conveying pump output terminal.
Preferably, the nozzle is provided with two, points to the work to be processed from the both sides up and down of workpiece to be processed respectively
The machining area of part.
It can be seen from the above technical proposal that selfreparing line electrode spark cutting device provided by the utility model, bag
Include line electrode, coating unit and solidification equipment；Wherein, line electrode can move relative to coating unit and solidification equipment；Coating
Device is used to coat conductor fluid on line electrode；Solidification equipment is led for making conductor fluid be solidificated in formation on line electrode surface
E-coat；
When in use, line electrode connects power cathode with one in workpiece to be processed, and another connects positive source, in traveling
Line electrode first by coating unit, coating unit is by conductor fluid coated on line electrode, and then line electrode is by solidification
Conductor fluid on line electrode is formed by curing conductive coating layer by device, solidification equipment, and subsequent line electrode marches to work to be processed
At part, electro-discharge machining is carried out to workpiece to be processed using conductive coating layer, due to the presence of conductive coating layer, line electrode base itself
This does not participate in electro-discharge machining directly, is also just difficult to discharge loss occur, when conductive coating layer is lost by electro-discharge machining,
Line electrode can be made to pass through another set of coating unit and solidification equipment successively again by changing the direct of travel of line electrode, so as to
Supplement reparation is carried out to the conductive coating layer of loss, so moving in circles makes line electrode in process all the time by outside
Conductive coating layer carries out electro-discharge machining, makes the recyclable reciprocal use of line electrode, and its process is：When line electrode from upper silk cylinder out according to
The secondary coating unit of approach first and the first solidification equipment, then march at workpiece by the first guide wheel, utilize conductive coating layer
To workpiece to be processed carry out electro-discharge machining, this process be continued for being discarded to last lap to the line electrode for being wrapped in upper silk cylinder be
Only, the second solidification equipment is idle in this course, and its direction of rotation will change, and now the second solidification equipment will open
It is dynamic, and line electrode will pass through the second coating unit and the second solidification equipment successively, be marched to through the second guide wheel at workpiece, using leading
E-coat carries out electro-discharge machining to workpiece to be processed, so as to carry out circulation Reusability to line electrode, and first during this
Solidification equipment does not work.The use pattern that this line electrode moves in circles undoubtedly realizes the recycling of line electrode, is ensureing
Processing cost is reduced while machining accuracy, the time for changing line electrode is saved, improves efficiency.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation for the selfreparing line electrode spark cutting device that the utility model embodiment provides；
Fig. 2 is the partial structurtes enlarged diagram at A in Fig. 1；
Fig. 3 is selfreparing line electrode spark cutting device, the work liquid supply unit that the utility model embodiment provides
And the front view of lathe；
Fig. 4 is the partial structurtes enlarged diagram at B in Fig. 3.
Embodiment
The utility model provides a kind of selfreparing line electrode spark cutting device, makes line electrode thereon to reach
With long lifespan, machining accuracy is high, and workpiece scrappage is low, reduces the purpose of processing cost.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Fig. 1-Fig. 4 is referred to, Fig. 1 is the selfreparing line electrode spark cutting device that the utility model embodiment provides
Structural representation, Fig. 2 are the partial structurtes enlarged diagram at A in Fig. 1, and Fig. 3 is reviewing one's lessons by oneself for the utility model embodiment offer
The front view of multiple line electrode spark cutting device, work liquid supply unit and lathe, Fig. 4 are that the partial structurtes in Fig. 3 at B are put
Big schematic diagram.
The utility model embodiment provides a kind of selfreparing line electrode spark cutting device, including line electrode 1, coating
Device 2 and solidification equipment 3.
Wherein, line electrode 1 can move relative to coating unit 2,10 and solidification equipment 3,11；Coating unit 2,10 be used for
Conductor fluid 12 is coated on line electrode 1；Solidification equipment 3,11 is used to make the conductor fluid 12 be solidificated in the surface of line electrode 1
Upper formation conductive coating layer 13.
Compared with prior art, the selfreparing line electrode spark cutting device that the utility model embodiment provides, makes
Used time, line electrode 1 connect the positive pole of power supply 9, and workpiece to be processed 8 connects the negative pole of power supply 9, or, line electrode 1 connects the negative pole of power supply 9, to be processed
Workpiece 8 connects the positive pole of power supply 9, and conductor fluid 12 is coated in by the line electrode 1 in traveling by coating unit 2, coating unit 2 first
On line electrode 1, then line electrode 1 passes through solidification equipment 3, and the conductor fluid 12 on line electrode 1 is solidified into conduction by solidification equipment 3
Coat 13, subsequent line electrode 1 are marched at workpiece to be processed 8, are discharged using 13 pairs of workpiece to be processed 8 of conductive coating layer
Processing, so, because line electrode 1 itself is not involved in electro-discharge machining substantially, its intensity and diameter dimension are unaffected substantially,
It is not easy fracture of wire, and circulation Reusability can be carried out to line electrode by way of changing the direct of travel of line electrode 1, is protecting
Processing cost is reduced while demonstrate,proving machining accuracy, the time for changing line electrode 1 is saved, improves efficiency.
Further optimize above-mentioned technical proposal, it is steady during in order to ensure the work of selfreparing line electrode spark cutting device
Qualitative, in the utility model embodiment, selfreparing line electrode spark cutting device also includes lathe, and being provided with lathe can
Rotationally upper silk cylinder 4 and lower silk cylinder 5, line electrode 1, which is opened, to be located between silk cylinder 4 and lower silk cylinder 5, so, at work, upper silk cylinder
4 rotate releasing line electrode 1, and the lower synchronous axial system of silk cylinder 5 winds line electrode 1, when the line electrode 1 wound on upper silk cylinder 4 is discarded to most
During latter circle, controllable upper silk cylinder 4 and lower silk cylinder 5 invert, and move backward line electrode 1, so as to which line electrode 1 will be filled by coating
Put 10 and solidification equipment 11 in its resurfacing conductive coating layer.
Further optimize above-mentioned technical proposal, in order to ensure solidification equipment 3 and solidification equipment 11 in each processing bout
Run well, when upper silk cylinder 4 releases line electrode 1, controllable solidification equipment 3 starts, and solidification equipment 11 disconnects；When silk cylinder 4 and
When lower silk cylinder 5 inverts, controllable solidification equipment 11 starts, and solidification equipment 3 disconnects.
Preferably, upper silk cylinder 4 and lower silk cylinder 5 are driven by servomotor rotates, and rotating speed is adjustable, so as to adjust line electrode
1 gait of march.
In process, relative displacement must realizes cutting between workpiece to be processed 8 and line electrode 1,
Therefore, in the utility model embodiment, selfreparing line electrode spark cutting device also includes can be relative to machine tool motion
Workbench, workbench are used to carry and clamp workpiece to be processed 8, certainly, driving lathe and the displacement machine of workbench relative movement
Structure can be connected with lathe, can also be connected with workbench or can be connected respectively with lathe and workbench.
Setting for the ease of coating unit 2,10 and solidification equipment 3,11 and the moment of line electrode 1 is set to keep tensioning, at this
Be additionally provided with utility model embodiment, on lathe for adjust line electrode 1 trend guide wheel, by adjust guide wheel quantity and
Position, thus it is possible to vary the trend of line electrode 1, make it be more suitable for processing, while make line electrode 1 keep tensioning.
Further, the position of guide wheel is adjustable, in order to adjust the rate of tension of line electrode 1.
It is provided with the first guide wheel 7 and the second guide wheel 6 in embodiment as shown in figures 1 and 3, on lathe, described first
First coating unit 2 and first solidification equipment 3, second guide wheel are provided between guide wheel 7 and the upper silk cylinder 4
Second coating unit 10 and second solidification equipment 11 are provided between 6 and the lower silk cylinder 5.
Further optimize above-mentioned technical proposal,, can after bout discharge loss because line electrode 1 is back and forth movement
Pass sequentially through coating unit 2 and solidification equipment 3 rebuilds the conductive coating layer 13 of loss, therefore, the silk cylinder 4 on returning to of line electrode 1
Also need to, by coating unit 2, be also possible to that conductor fluid 12 can be coated with thereon before, it is conductive if do not handled it
Fluid 12 is difficult to secure on line electrode 1, and line electrode 1 easily brings the conductor fluid of liquid into silk cylinder, causes to waste, or even have
Potential safety hazard, in order to avoid above mentioned problem, in the utility model embodiment, coating unit 2 is to be contained with conductor fluid 12
Tank, the through hole for being available for line electrode 1 to pass through is offered in two relative side walls of tank, tank is away from the side of solidification equipment 3
Through hole with line electrode 1 is micro- is engaged, coordinate close to through hole and the gap of line electrode 1 of the side of solidification equipment 3.By making tank
Through hole away from the side of solidification equipment 3 with line electrode 1 is micro- is engaged, the conductor fluid on line electrode 1 can be wiped off, avoided
It is dripped, while avoids it from adhering on silk cylinder 4, and on tank close to solidification equipment 3 through hole due to solidification equipment 3 away from
From relatively closely, for line electrode 1 by rear from through hole, conductor fluid thereon can solidify shape rapidly in the presence of solidification equipment 3
, therefore, can be by the appropriate expansion of the through hole of the side, in order to which line electrode 1 passes through into conductive coating layer 13；Coating unit 10 is with applying
Coating device 2 is identical, and conductor fluid can be avoided to adhere on lower silk cylinder 5.
Certainly, can also be by the way of the active to coating on line electrode 1 in addition to above-mentioned passive type coating unit 2
Conductor fluid 12, such as can be by the way of spraying.
The optional scope of conductor fluid 12 is very wide, and those skilled in the art can be selected as needed, such as, electrical conduction current
The main body of body 12 is conductive silver paste, conductive copper paste, conductive carbon paste or electrically conductive ink, and auxiliary body is light curing agent, conductor fluid 12
Material it is different, property is different, and its curing mode is also required to be adjusted correspondingly, such as, ventilation unit can be used in normal temperature
Under solidified, or, solidified using ultraviolet curing device or the device that is heating and curing.
In order to ensure being normally carried out for electro-discharge machining, in process, it is necessary to carry out feed flow to machining area and wash away
Chip removal, therefore, in the utility model embodiment, selfreparing line electrode spark cutting device also includes being used for machining area
Supply the work liquid supply unit of working solution.
Work liquid supply unit is mainly used in providing working solution to machining area to play a part of feed flow and wash away chip removal,
Therefore, in the utility model embodiment, work liquid supply unit includes being used to hold the liquid bath 16 of working solution, for extracting work
The nozzle 14 made the delivery pump 15 of liquid and be connected with conveying pump output terminal.Certainly, the structure of liquid supply unit of working not only limits
In said structure, those skilled in the art can be adjusted as needed, as long as can play feed flow to machining area and wash away
The effect of chip removal, the utility model embodiment do not limit.
Further optimize above-mentioned technical proposal, it is only lateral to be processed from one when workpiece to be processed 8 has certain thickness
Supply working solution on workpiece 8, may due to working solution can not rapid Cover machining area, cause feed flow and to wash away chip removal too late
When, effect is poor, and therefore, in the utility model embodiment, nozzle 14 is provided with two, respectively above and below workpiece to be processed 8
Point to the machining area of workpiece to be processed 8 in both sides.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments in the case where not departing from spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (9)
- A kind of 1. selfreparing line electrode spark cutting device, it is characterised in that including：The line electrode (1) reciprocally advanced；For to the first coating unit (2) and the second coating unit (10) that conductor fluid (12) is coated on the line electrode (1)；Consolidate for making the conductor fluid (12) be solidificated in first of formation conductive coating layer (13) on the line electrode (1) surface (3) and the second solidification equipment (11) are put in makeup；First coating unit (2) and the second coating unit (10) are the tank for being contained with the conductor fluid (12), described The through hole for being available for the line electrode (1) to pass through is offered in two relative side walls of tank, and the through hole is led positioned at described Under electrofluid (12) liquid level, wherein the through hole close to first solidification equipment (3) and the line on the first coating unit (2) Electrode (1) gap coordinates, the through hole away from first solidification equipment (3) with the line electrode (1) is micro- is engaged, the second painting Two through-hole structures of coating device (10) are identical with the through hole of the first coating unit (2)；When line electrode (1) from upper silk cylinder (4) to When lower silk cylinder (5) direction is advanced, the first solidification equipment (3) work, the second solidification equipment (11) does not work；When line electrode (1) from During silk cylinder (4) direction traveling downwards of upper silk cylinder (5), the second solidification equipment (11) work, the first solidification equipment (3) does not work；For supplying the work liquid supply unit of working solution to machining area.
- 2. selfreparing line electrode spark cutting device according to claim 1, it is characterised in that also including lathe, institute State and the upper silk cylinder (4) reciprocally rotated and lower silk cylinder (5) are provided with lathe, the line electrode (1) is located at the upper silk cylinder (4) between the lower silk cylinder (5).
- 3. selfreparing line electrode spark cutting device according to claim 2, it is characterised in that also including can be relative to The workbench of the machine tool motion, the workbench are used to carry and clamp workpiece to be processed (8).
- 4. selfreparing line electrode spark cutting device according to claim 2, it is characterised in that also set on the lathe It is equipped with the guide wheel for adjusting the line electrode (1) trend.
- 5. selfreparing line electrode spark cutting device according to claim 4, it is characterised in that set on the lathe There are the first guide wheel (7) and the second guide wheel (6), described first is provided between first guide wheel (7) and the upper silk cylinder (4) Coating unit (2) and first solidification equipment (3), it is provided between second guide wheel (6) and the lower silk cylinder (5) described Second coating unit (10) and second solidification equipment (11).
- 6. the selfreparing line electrode spark cutting device according to claim any one of 1-5, it is characterised in that described to lead The main body of electrofluid (12) is conductive silver paste, conductive copper paste, conductive carbon paste or electrically conductive ink, and auxiliary body is light curing agent.
- 7. the selfreparing line electrode spark cutting device according to claim any one of 1-5, it is characterised in that described One solidification equipment (3) and the second solidification equipment (11) are ultraviolet curing device or the device that is heating and curing.
- 8. selfreparing line electrode spark cutting device according to claim 1, it is characterised in that the working solution supply Device includes being used to hold the liquid bath of working solution, the delivery pump for extracting working solution and being connected with the conveying pump output terminal Nozzle.
- 9. selfreparing line electrode spark cutting device according to claim 8, it is characterised in that the nozzle is provided with Two, the machining area of the workpiece to be processed (8) is pointed to from the both sides up and down of workpiece to be processed (8) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720269389.9U CN206912419U (en) | 2017-03-17 | 2017-03-17 | A kind of selfreparing line electrode spark cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720269389.9U CN206912419U (en) | 2017-03-17 | 2017-03-17 | A kind of selfreparing line electrode spark cutting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206912419U true CN206912419U (en) | 2018-01-23 |
Family
ID=61310512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720269389.9U Expired - Fee Related CN206912419U (en) | 2017-03-17 | 2017-03-17 | A kind of selfreparing line electrode spark cutting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206912419U (en) |
-
2017
- 2017-03-17 CN CN201720269389.9U patent/CN206912419U/en not_active Expired - Fee Related
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Granted publication date: 20180123 |