CN107902923A - Application system and its feeding device - Google Patents
Application system and its feeding device Download PDFInfo
- Publication number
- CN107902923A CN107902923A CN201711164516.XA CN201711164516A CN107902923A CN 107902923 A CN107902923 A CN 107902923A CN 201711164516 A CN201711164516 A CN 201711164516A CN 107902923 A CN107902923 A CN 107902923A
- Authority
- CN
- China
- Prior art keywords
- resin
- feeding device
- case lid
- probe
- storage device
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Coating Apparatus (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a kind of feeding device, the case lid of feed tank casing top is arranged on including feed box body and sealing, further include the storage device of upper and lower ends opening, case lid is equipped with feedhole, storage device is arranged on case lid top and the lower port of storage device connects the feedhole, the control valve for being used for controlling feedhole folding is equipped with the feedhole, resin probe is respectively equipped with default minimum resin height in feed box body and at default highest resin height, resin probe, control valve is electrically connected in controller, the controller can control the keying of control valve according to the signal of resin probe, case lid is equipped with the feed orifice for being used for connecting coating hopper.Such a feeding device can reduce the waste of resin, improve feed efficiency.The invention also discloses a kind of application system for including above-mentioned feeding device, can reduce the waste of resin, improves feed efficiency.
Description
Technical field
The present invention relates to optical fiber coating technical field, more particularly to a kind of feeding device.It is moreover, it relates to a kind of
Include the application system of above-mentioned feeding device.
Background technology
It is coating to have a significant process in wire drawing production, and coating procedure needs resin to act on optical fiber, and bare fibre surface applies
First layer resin is primary coating, and it is secondary coating that bare fibre surface, which is painted with after first layer resin and applies second layer resin again,.At present
A kind of main application system is using 10Kg resin barrel monomer feeds.
In 10Kg resin barrel monomer feeds, 10Kg resin barrels are directly placed into feed tank box house, by certain
The resin of feed tank box house is expressed in coating hopper by pressure；When the resin in resin barrel in babinet runs low, meeting
Sensor alarming, and it is replaced with new bucketful resin.In order to save resin and make full use of the resin in resin barrel, it is necessary to by
The resin barrel being almost finished carries out and bucket, i.e. by already close to the bung hole for the resin barrel being finished down, corresponding vertical place carries out two-by-two
Resin trap, recycles after resin trap.
However, in simultaneously bucket, staff can be such that the resin in resin barrel overflows resin and bucket misoperation sometimes
Come, cause resin leakage, waste resin, and influence on-site sanitation situation；When resin is finished in resin barrel in usual babinet,
Need to be reentered into new resin barrel, need that the fixed screw between babinet and resin barrel is backed out and then screwed on during this period
Go, it is relatively time consuming, laborious.
Therefore, the waste of resin how is reduced, feed efficiency is improved, is the skill that those skilled in the art need to solve at present
Art problem.
The content of the invention
In view of this, the object of the present invention is to provide a kind of feeding device, the waste of resin can be reduced, improves feed effect
Rate.It is a further object of the present invention to provide a kind of application system for including above-mentioned feeding device, the waste of resin can be reduced, is carried
Height feed efficiency.
To achieve the above object, the present invention provides following technical solution：
A kind of feeding device, including feed box body and sealing are further included arranged on the case lid of the feed tank casing top
The storage device of upper and lower ends opening, the case lid are equipped with feedhole, and the storage device is arranged on above the case lid and institute
The lower port for stating storage device connects the feedhole, and the control for being used for controlling the feedhole folding is equipped with the feedhole
Valve, it is described feed box body in default minimum resin height at and default highest resin height at be respectively equipped with resin probe,
The resin probe, the control valve are electrically connected in controller, and the controller can be according to the resin probe
Signal controls the keying of the control valve, and the case lid is equipped with the feed orifice for being used for connecting coating hopper.
Preferably, the storage device includes storage unit and the hickey being threadedly coupled for the bung hole with resin barrel.
Preferably, the upside of the hickey is equipped with the bracket for being used for holding the resin barrel.
Preferably, the vacuum pumping pump for removing the air in the feed box body is further included, the vacuum pumping pump connects
The feed box body is connected to, and the vacuum pumping pump is electrically connected the controller, the controller can be in predetermined time
The vacuum pumping pump is controlled to start.
Preferably, the lower end of the control valve connects the case lid by first flange portion, and the upper end of the control valve leads to
Cross the lower port that second flange portion connects the storage device.
Preferably, probe mounting rod is further included, the case lid is equipped with probe hole, and the probe mounting rod is by the case lid
On probe hole stretch into it is described feed box body inside, the resin probe be arranged on it is described probe mounting rod on.
Preferably, the control valve is pneumatic operated valve.
Preferably, the storage device is clear storage device.
Preferably, the case lid is 316ss stainless steel case lids.
A kind of application system, including feeding device, resin barrel and coating hopper, the feeding device are as above-mentioned any one
Feeding device described in, the feed orifice of the feeding device are communicated in the coating hopper by feeder sleeve.
Feeding device provided by the invention includes feed box body, seals the case lid arranged on feed tank casing top, is upper and lower
The storage device of both ends open.Case lid is equipped with feedhole, and storage device is arranged on case lid top and the lower port of storage device connects
Lead to feedhole, control valve is equipped with feedhole.It is fed at the default minimum resin height in box body and default highest resin is high
Resin probe is respectively equipped with degree, resin probe, control valve are electrically connected in controller.Case lid is equipped with to be used to connect and applies
Cover the feed orifice of hopper.
In feed, without resin barrel is put into feed box body.Resin probe can be to resin in feed box body
Storage be monitored, when resin probe detect feed box body in resin level reach default minimum resin height when, by
Resin probe conveys signal to controller, and controller control control valve is opened, and staff will set from the upper port of storage device
Resin in fat bucket pours into feed tank box house through storage device, feedhole；When resin probe is detected in feed box body
When resin level reaches default highest resin height, signal is conveyed from resin probe to controller, controller control control valve closes
Close.If still residue has resin in resin barrel, since feedhole has been closed, the residual resin in resin barrel can enter storage dress
In putting, stored by storage device, when next control valve is opened, the resin in storage device can be introduced into feed box body
In.Feed orifice can be used for connection coating hopper to provide resin to coating hopper.
In such a feeding device, feed mode is changed to resin barrel resin is directly poured into feed box body, resin is visited
Head, control valve and controller can coordinate the amount of resin in control feed box body.If residue has resin, Ke Yizhi in resin barrel
Connect and stored by storage device so that next time is fed, once feed operation can all take out the resin in resin barrel, keep away
Exempt from the prior art and bucket operation brings resin leakage problem, the waste to resin can be reduced, influence scene can be avoided to defend
Raw situation；It need not be fixedly connected between resin barrel and feed box body by fixed screw, feed efficiency is higher, can reduce
The labor intensity of staff, reduce supplement resin required time.
The application system provided by the present invention for including above-mentioned feeding device, can reduce the waste of resin, improve feed
Efficiency.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is structure diagram of the feeding device provided by the present invention when being connected with resin barrel；
Fig. 2 is sectional view of the feeding device provided by the present invention when being connected with resin barrel；
Fig. 3 is the sectional view of application system provided by the present invention；
Fig. 4 is the application drawing of application system provided by the present invention.
In Fig. 1 to Fig. 4：1- resin barrels, 2- brackets, 3- hickeys, 4- storage units, 5- second flanges portion, 6- control valves,
7- case lids, 8- resin probes, 9- vacuum pumping pumps, 10- feed box bodies, 11- coating hoppers, 12- bare fibres, 13- primary coatings
Die station, bis- coating die station of 14-, optical fiber after 15- coatings, bis- application systems of 16-, 17- probe mounting rods, 18- first flanges
Portion.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
The core of the present invention is to provide a kind of feeding device, can reduce the waste of resin, improves feed efficiency.The present invention
Another core be to provide a kind of application system for including above-mentioned feeding device, can reduce the waste of resin, improve feed effect
Rate.
Please refer to Fig.1 and Fig. 2, Fig. 1 are structure diagram of the feeding device provided by the present invention when being connected with resin barrel；
Fig. 2 is sectional view of the feeding device provided by the present invention when being connected with resin barrel.
In a kind of specific embodiment of feeding device provided by the present invention, including it is fed box body 10, is sealingly disposed in confession
Case lid 7, the storage device of upper and lower ends opening at the top of hopper babinet 10, storage device are arranged on the top of case lid 7.Feed tank
The case lid 7 of babinet 10 is equipped with feedhole, and the control valve 6 for being used for controlling feedhole folding is equipped with feedhole, storage device
Lower port connects feedhole.
Resin spy is respectively equipped with default minimum resin height in feed box body 10 and at default highest resin height
First 8, resin probe 8, control valve 6, which are electrically connected, can control according to the signal of resin probe 8 and control in controller, controller
The keying of valve 6 processed, when control valve 6 is opened, feedhole is opened, and storage device is being controlled with being connected inside feed box body 10
When valve 6 processed is closed, feedhole is enclosed, and storage device inside feed box body 10 with being separated.Case lid 7, which is equipped with, to be used to connect
The feed orifice of logical coating hopper 11.
Specifically, storage device can include storage unit 4 and hickey 3, which is used for and resin barrel 1
Bung hole is threadedly coupled.Further, which can set the bracket 2 for holding resin barrel 1, bracket 2
Be preferably shaped to it is consistent with the peripheral shape at 1 bung hole of resin barrel, with ensure bracket 2 stablize stud with support resin barrel 1.
Wherein, hickey 3 can be arranged on the top of storage unit 4, to prevent the setting of hickey 3 from reducing the storage of storage unit 4
Space.
In feed, without resin barrel 1 is put into feed box body 10.Resin probe 8 can be to being fed box body 10
The storage of middle resin is monitored, when resin probe 8 detects that resin level reaches default minimum resin in feed box body 10
During height, signal is conveyed from resin probe 8 to controller, controller control control valve 6 is opened, and staff is from storage device
Upper port pours into the resin in resin barrel 1 inside feed box body 10 through storage device, feedhole；When resin probe 8 detects
When resin level reaches default highest resin height in feed box body 10, signal, control are conveyed from resin probe 8 to controller
Device control control valve 6 processed closes.
Wherein, lighter in weight, correspondingly, feeding are generally selected for ease of the installation and dismounting of control valve 6, control valve 6
The aperture in hole may be smaller, can specifically be less than the bung hole bore of resin barrel 1.When control valve 6 is opened, will not at this time preferably
The bung hole of resin barrel 1 is tightened with 3 screw thread of hickey, carries out the vertical of resin barrel 1 downwards from the upper port of storage device manually
Topple over operation, i.e., it is hand steered to help resin barrel 1 to carry out toppling over operation, in order to control resin to flow into the speed of feedhole, avoid being fed
When because the flow velocity of resin is too fast overflow feedhole, meanwhile, the control to flow velocity should be passed through when pouring into and reduce bubble as far as possible
Produce.
If still residue has resin in resin barrel 1, resin barrel 1 is buckled to and is fixedly connected on storage device, i.e., by resin barrel 1
Bung hole tightened with 3 screw thread of hickey, resin barrel 1 is buckled to and is fixedly connected on storage device, bracket 2 can be held
At the bung hole of resin barrel 1, placed so that resin barrel 1 is stablized.Residual resin in resin barrel 1 can enter in storage device, by storing up
Cryopreservation device is stored.Due to when handling residual resin, resin barrel 1 and total resin weight in it are usually relatively light, will set
Fat bucket 1 is fixedly connected with storage device, can be to avoid resin barrel 1 deviates storage device during residual resin in processing resin barrel 1
Upper port, can prevent resin from falling outside storage device.When next control valve 6 is opened, the resin in storage device can be first
Into in feed box body 10.
When needing to be fed to coating hopper 11, coating hopper 11 is connected by feed orifice, from feeding device directly to painting
Cover hopper 11 and supply resin.Wherein, pressurization hole can be equipped with case lid 7, is pressurizeed by pressurizeing hole into feed box body 10, with
Resin is released from feed orifice and enters coating material case 11.
On the basis of above-described embodiment, resin probe 8 can also be electrically connected alarm, so as to when lacking material or filling
Alarm, remind staff to be fed in box body 10 situation that feeds.Alarm be specifically as follows indicator light, buzzer or its
His device.
On the basis of any one above-mentioned embodiment, which can also include being used to remove feed box body 10
In air vacuum pumping pump 9, vacuum pumping pump 9 be connected to feed box body 10.Wherein, it can specifically set pumping true on case lid 7
Emptying aperture, 10 inside of hole connection feed box body and vacuum pumping pump 9 are vacuumized by this.Vacuum pumping pump 9 is electrically connected controller, control
Device processed can control vacuum pumping pump 9 to start in predetermined time.
Exemplified by the time of device control control valve 6 completely closes predetermined time in order to control, at the moment, box body 10 is fed
In resin be filled to default highest resin height, vacuum pumping pump 9, which starts, to bring into operation, and takes out the sky in feed box body 10
Gas, so as to remove the air in feed box body 10 and pour into the bubble of resin generation.Certainly, predetermined time can also be other
Moment, e.g., controller control control valve 6 at the time of completely close after postpone a certain moment of some seconds.
On the basis of any one above-mentioned embodiment, the lower end of control valve 6 can pass through 18 connecting box of first flange portion
Lid 7, the upper end of control valve 6 can be connected the lower port of storage device by second flange portion 5, be easy to implement tearing open for control valve 6
Dress operation.
On the basis of any one above-mentioned embodiment, which can also include probe mounting rod 17, probe peace
Dress bar 17 is inserted into the inside of feed box body 10 by the probe hole being arranged on case lid 7.Resin probe 8 can be arranged on the spy
On head mounting rod 17, the installation operation of resin probe 8 is easy to implement.
On the basis of any one above-mentioned embodiment, control valve 6 can be pneumatic operated valve, and sensitivity is higher.Certainly, control
Valve 6 can also select hydraulic operated valve or other valves.
On the basis of any one above-mentioned embodiment, storage device can be clear storage device, i.e., in storage device
The resin storage condition in portion is visual on the outside of storage device, consequently facilitating staff grasps the resin of resin storage device
The flow velocity of storage and resin direction feed box body 10.
On the basis of any one above-mentioned embodiment, case lid 7 can be 316ss stainless steel case lids, and comprehensive performance is preferable.
Except above-mentioned feeding device, please refer to Fig.3, present invention also offers one kind to include feed disclosed in above-described embodiment
The application system of device, the application system further include the components such as resin barrel 1, coating hopper 11.The application system as a result of
Above-mentioned feeding device, can reduce the waste of resin, improve feed efficiency.The structure of other each several parts of the application system please join
The prior art is examined, is repeated no more herein.
It should be noted that please refer to Fig.4, when being coated, bare fibre 12 is usually through primary coating die station 13, secondary
The coating operation twice for coating die station 14 forms optical fiber 15 after coating, and primary coating system connection primary coating die station 13 is secondary
Application system 16 connects secondary coating die station 14, and application system provided by the present invention can be used as primary coating system, can also
As secondary application system 16.
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.
Application system provided by the present invention and its feeding device are described in detail above.Tool used herein
Body example is set forth the principle of the present invention and embodiment, and the explanation of above example is only intended to help to understand this hair
Bright method and its core concept.It should be pointed out that for those skilled in the art, the present invention is not being departed from
On the premise of principle, some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into right of the present invention
It is required that protection domain in.
Claims (10)
1. a kind of feeding device, including feed box body (10) and sealing are arranged on the case lid at the top of the feed box body (10)
(7), it is characterised in that further include the storage device of upper and lower ends opening, the case lid (7) is equipped with feedhole, the storage
Device is arranged on the case lid (7) top and the lower port of the storage device connects the feedhole, is equipped with the feedhole
For controlling the control valve (6) of the feedhole folding, at the default minimum resin height in the feed box body (10) with
Resin probe (8) is respectively equipped with default highest resin height, the resin probe (8), the control valve (6) electrically connect respectively
Controller is connected to, the controller can control the keying of the control valve (6), institute according to the signal of the resin probe (8)
State case lid (7) and be equipped with the feed orifice for being used for connecting coating hopper (11).
2. feeding device according to claim 1, it is characterised in that the storage device includes storage unit (4) and is used for
The hickey (3) being threadedly coupled with the bung hole of resin barrel (1).
3. feeding device according to claim 2, it is characterised in that the upside of the hickey (3), which is equipped with, to be used to drag
State the bracket (2) of resin barrel (1) in residence.
4. according to the feeding device described in claims 1 to 3 any one, it is characterised in that further include for removing the confession
The vacuum pumping pump (9) of air in hopper babinet (10), the vacuum pumping pump (9) are connected to the feed box body (10), and
The vacuum pumping pump (9) is electrically connected the controller, and the controller can control the vacuum pumping pump (9) in predetermined time
Start.
5. feeding device according to claim 4, it is characterised in that the lower end of the control valve (6) passes through first flange
Portion (18) connects the case lid (7), and the upper end of the control valve (6) connects the storage device by second flange portion (5)
Lower port.
6. feeding device according to claim 4, it is characterised in that further include probe mounting rod (17), the case lid (7)
Probe hole is equipped with, the probe mounting rod (17) stretches into the feed box body (10) by the probe hole on the case lid (7)
Inside, the resin probe (8) is arranged on probe mounting rod (17).
7. feeding device according to claim 4, it is characterised in that the control valve (6) is pneumatic operated valve.
8. feeding device according to claim 4, it is characterised in that the storage device is clear storage device.
9. feeding device according to claim 1, it is characterised in that the case lid (7) is 316ss stainless steel case lids.
10. a kind of application system, including feeding device, resin barrel (1) and coating hopper, it is characterised in that the feeding device
For the feeding device described in claim 1 to 9 any one, the feed orifice of the feeding device is communicated in described by feeder sleeve
Coat hopper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711164516.XA CN107902923B (en) | 2017-11-21 | 2017-11-21 | Coating system and feeding device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711164516.XA CN107902923B (en) | 2017-11-21 | 2017-11-21 | Coating system and feeding device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107902923A true CN107902923A (en) | 2018-04-13 |
| CN107902923B CN107902923B (en) | 2021-02-19 |
Family
ID=61846847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711164516.XA Active CN107902923B (en) | 2017-11-21 | 2017-11-21 | Coating system and feeding device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107902923B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718594A2 (en) * | 1994-12-22 | 1996-06-26 | Sumitomo Wiring Systems, Ltd. | Method and device for illumination in terminated cable part inspection device for stripped terminal crimping machine |
| WO2006057251A1 (en) * | 2004-11-26 | 2006-06-01 | Kabushiki Kaisha Kobe Seiko Sho | Optical fiber drawing apparatus |
| CN2850719Y (en) * | 2005-11-10 | 2006-12-27 | 江苏亨通光纤科技有限公司 | Automatic coating feeding device for optical fiber drawing tower |
| CN202543066U (en) * | 2012-03-23 | 2012-11-21 | 住电光纤光缆（深圳）有限公司 | Coating system for optical fiber coloring |
| CN103304155A (en) * | 2013-04-27 | 2013-09-18 | 江苏亨通光纤科技有限公司 | Feeding device for optical fiber coating |
| CN204237709U (en) * | 2014-11-14 | 2015-04-01 | 江苏南方光纤科技有限公司 | A kind of optical fiber coating feed system |
| CN204842851U (en) * | 2015-07-14 | 2015-12-09 | 苏州三信机器制造有限公司 | Resin centralized supply system |
| CN105327839A (en) * | 2015-12-03 | 2016-02-17 | 中天科技光纤有限公司 | Concentrated automatic control switching type feeding system and control method thereof |
| CN205710136U (en) * | 2016-04-11 | 2016-11-23 | 浙江碧源环保科技有限公司 | A kind of plating cupric poaching wastewater processing system |
-
2017
- 2017-11-21 CN CN201711164516.XA patent/CN107902923B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718594A2 (en) * | 1994-12-22 | 1996-06-26 | Sumitomo Wiring Systems, Ltd. | Method and device for illumination in terminated cable part inspection device for stripped terminal crimping machine |
| WO2006057251A1 (en) * | 2004-11-26 | 2006-06-01 | Kabushiki Kaisha Kobe Seiko Sho | Optical fiber drawing apparatus |
| CN2850719Y (en) * | 2005-11-10 | 2006-12-27 | 江苏亨通光纤科技有限公司 | Automatic coating feeding device for optical fiber drawing tower |
| CN202543066U (en) * | 2012-03-23 | 2012-11-21 | 住电光纤光缆（深圳）有限公司 | Coating system for optical fiber coloring |
| CN103304155A (en) * | 2013-04-27 | 2013-09-18 | 江苏亨通光纤科技有限公司 | Feeding device for optical fiber coating |
| CN204237709U (en) * | 2014-11-14 | 2015-04-01 | 江苏南方光纤科技有限公司 | A kind of optical fiber coating feed system |
| CN204842851U (en) * | 2015-07-14 | 2015-12-09 | 苏州三信机器制造有限公司 | Resin centralized supply system |
| CN105327839A (en) * | 2015-12-03 | 2016-02-17 | 中天科技光纤有限公司 | Concentrated automatic control switching type feeding system and control method thereof |
| CN205710136U (en) * | 2016-04-11 | 2016-11-23 | 浙江碧源环保科技有限公司 | A kind of plating cupric poaching wastewater processing system |
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| Publication number | Publication date |
|---|---|
| CN107902923B (en) | 2021-02-19 |
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