CN114130745A - Automatic maintenance method for horizontal line of circuit board - Google Patents
Automatic maintenance method for horizontal line of circuit board Download PDFInfo
- Publication number
- CN114130745A CN114130745A CN202111475012.6A CN202111475012A CN114130745A CN 114130745 A CN114130745 A CN 114130745A CN 202111475012 A CN202111475012 A CN 202111475012A CN 114130745 A CN114130745 A CN 114130745A
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- Prior art keywords
- horizontal line
- pipe
- circuit board
- spray
- automatic maintenance
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- 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.)
- Pending
Links
- 238000012423 maintenance Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 49
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 238000001802 infusion Methods 0.000 claims abstract description 14
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000003814 drug Substances 0.000 claims description 19
- 239000012528 membrane Substances 0.000 claims description 16
- 238000011010 flushing procedure Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000001471 micro-filtration Methods 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
Landscapes
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention provides an automatic maintenance method for a horizontal line of a circuit board, which comprises a maintenance device, wherein the maintenance device comprises a horizontal line and comprises liquid conveying pipes, the upper end and the lower end of the horizontal line are symmetrically provided with spray pipes, the liquid conveying pipes are respectively connected with the spray pipes, the spray pipes are connected with spray heads, and the spray heads face the horizontal line; a water replenishing and cleaning pipe is arranged at one side of the infusion pipe, and a water replenishing bypass pipe is arranged at one side of the water replenishing and cleaning pipe; the filter also comprises a liquid return pipe, and the liquid return pipe is connected with a filter assembly; and a cylinder bottom spray pipe is arranged below the horizontal line. The equipment can realize full-automatic maintenance through the program formulated by the prior art, does not need manual washing and brushing of the inside of the equipment, greatly shortens the maintenance time, effectively solves the problem of high labor intensity of personnel, and simultaneously improves the utilization rate of the equipment.
Description
Technical Field
The invention belongs to the technical field of PCBs, and particularly relates to an automatic maintenance method for a horizontal line of a circuit board.
Background
In the printed circuit board industry, a plurality of horizontal lines are used, and the horizontal lines refer to equipment for completing specific chemical reaction on a circuit board through participation of liquid medicine and clear water.
The general process flow of the horizontal line processing circuit board is as follows: the method comprises the following steps of washing water → medicinal water tanks (completing specific chemical reactions on a circuit board) → washing water → connecting different medicinal water tanks in series according to different processes to complete a series of chemical reactions → a drying section.
Horizontal line production facilities require 1 hour of small maintenance every day and 5 hours of large maintenance every week. The cleaning device is mainly used for cleaning the blockage problem of the spray head of the line body, the impurity problem in the groove body and the dirty problem of the roller. The common practice in the industry is to use a water gun for washing and manually brushing for horizontal line maintenance, the labor intensity is high, people need to contact various toxic, harmful and corrosive liquid medicines, the working environment for maintenance is poor, and the equipment yield is influenced by long time consumed for maintenance.
Disclosure of Invention
In view of the above, the present invention provides an automatic maintenance method for a horizontal line of a circuit board.
The technical scheme of the invention is as follows:
a circuit board horizontal line automatic maintenance method is characterized by comprising a maintenance device, and comprises the following steps:
s1, after the circuit board is produced, starting a one-key program to enter an automatic maintenance program, and starting the circuit board after the circuit board passes a horizontal line;
s2, a PLC (central control module) controls a pneumatic valve to make a developing spray pump extract tank liquid, including but not limited to flushing the cylinder bottom by a spray pipe on the cylinder side and the bottom and at the dead angle under the liquid level, stirring up liquid medicine sediment, and controlling to discharge waste liquid;
s3, controlling the pneumatic valve through a PLC program to enable the booster pump to pump clear water, carrying out high-pressure cleaning on the spray pipe and the spray head by the clear water, removing liquid medicine in the spray plate frame and opening foreign matters blocking the spray nozzle to prevent the spray nozzle from being blocked, and setting the time to be an open type according to requirements;
s4, starting a booster pump, closing a pneumatic valve of a spray pipe at the bottom of the cylinder, flushing the liquid medicine tank with clear water by utilizing upper and lower spray heads, and setting the time to be open according to requirements;
s5, starting a booster pump, closing pneumatic valves of branch liquid conveying pipes of the upper and lower swing frames, opening a pneumatic valve of a cylinder bottom nozzle, flushing the cylinder bottom with clean water again by using the cylinder bottom nozzle, and simultaneously discharging waste water, wherein the time is set to be open and set according to requirements;
s6, calling manual confirmation after maintenance is finished;
s7, confirming that the maintenance is finished, automatically extracting the prepared tank liquor, and entering a working state;
s8, controlling a pneumatic valve through a PLC program after the last plate in the material waiting for shutdown passes through the horizontal line, so that liquid medicine in a booster pump extraction groove body in normal production is switched to be clear water in an extraction water supplementing bypass pipe, the liquid medicine in a pipeline system from the booster pump to a tail end nozzle is discharged, the pipeline system is prevented from being blocked due to the fact that the liquid medicine stops flowing and crystallizing, time is set to be open, and the time is set according to requirements.
Step S7 is carried out by adopting the prior art equipment, preparing corresponding bath solution by using concentrated bath solution in the pipeline and clear water through an auxiliary bath, heating to working temperature, and waiting for extraction of a corresponding liquid medicine tank.
Furthermore, the maintenance device comprises a horizontal line and an infusion tube, wherein the upper end and the lower end of the horizontal line are symmetrically provided with spray pipes, the infusion tube is respectively connected with the spray pipes, the spray pipes are connected with spray heads, and the spray heads face the horizontal line; a water replenishing and cleaning pipe is arranged at one side of the infusion pipe, and a water replenishing bypass pipe is arranged at one side of the water replenishing and cleaning pipe; the filter also comprises a liquid return pipe, and the liquid return pipe is connected with a filter assembly; and a cylinder bottom spray pipe is arranged below the horizontal line.
In the invention, a group of water replenishing bypass pipes controlled by pneumatic valves are added to the booster pump, and matched nozzles (cylinder bottom spray pipes) of the flushing spray pipes are added to the side walls and the spraying blind areas at the cylinder bottom and under the liquid level, so that the cleaning effect can be ensured.
Furthermore, the device also comprises a booster pump which is respectively connected with the infusion tube and the liquid return tube.
Furthermore, a float valve is arranged at the water outlet of the clean water replenishing pipe, and the liquid level height is tested.
Furthermore, the device also comprises a swing frame, wherein the swing frame is symmetrically arranged at the upper end and the lower end of the horizontal line, and the spray pipe is arranged on the swing frame.
Furthermore, the bottom of the maintenance device is connected with a drain pipe.
Furthermore, a drainage pneumatic valve is arranged at the joint of the maintenance device and the drainage pipe.
Furthermore, the infusion tube, the liquid return tube, the clear water replenishing tube, the water replenishing bypass tube and the cylinder bottom spray tube are all provided with pneumatic valves.
Furthermore, the filtering component comprises a filter and a precision filter which are connected in sequence.
Further, the precision filter comprises at least one of the following filter components: microfiltration component, fine filtration component, ceramic membrane component, tubular membrane component, PVDF membrane component and MBR membrane component.
In the invention, the filter and the precision filter are matched for use, so that fine impurities and foreign matters can be effectively filtered, and the probability of blocking the spray head is reduced.
Furthermore, the system also comprises a central control module which is respectively connected with the booster pump, the pneumatic valve and the drainage pneumatic valve.
In the invention, pneumatic valves are additionally arranged on each pipeline, automatic control is realized through PLC programming in the prior art, and automatic cleaning and maintenance can be realized.
In particular, the present invention relates to technical features of software and circuit programs, and the implementation of functions thereof belongs to the prior art, and the essence of the technical solution of the present application is to improve the composition and connection relationship of hardware parts, and does not relate to the improvement of the software program or the circuit structure itself.
The invention has the beneficial effects that:
the equipment can realize full-automatic maintenance through the program formulated by the prior art, does not need manual washing and brushing of the inside of the equipment, greatly shortens the maintenance time, effectively solves the problem of high labor intensity of personnel, and simultaneously improves the utilization rate of the equipment.
Drawings
Fig. 1 is a schematic structural view of a maintenance device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A circuit board horizontal line automatic maintenance method comprises a maintenance device, and comprises the following steps:
s1, after the circuit board is produced, starting a one-key program to enter an automatic maintenance program, and starting the circuit board after the circuit board passes a horizontal line;
s2, a PLC (central control module) controls a pneumatic valve to make a developing spray pump extract tank liquid, including but not limited to flushing the cylinder bottom by a spray pipe on the cylinder side and the bottom and at the dead angle under the liquid level, stirring up liquid medicine sediment, and controlling to discharge waste liquid;
s3, controlling the pneumatic valve through a PLC program to enable the booster pump to pump clear water, carrying out high-pressure cleaning on the spray pipe and the spray head by the clear water, removing liquid medicine in the spray plate frame and opening foreign matters blocking the spray nozzle to prevent the spray nozzle from being blocked, and setting the time to be an open type according to requirements;
s4, starting a booster pump, closing a pneumatic valve of a spray pipe at the bottom of the cylinder, flushing the liquid medicine tank with clear water by utilizing upper and lower spray heads, and setting the time to be open according to requirements;
s5, starting a booster pump, closing pneumatic valves of branch liquid conveying pipes of the upper and lower swing frames, opening a pneumatic valve of a cylinder bottom nozzle, flushing the cylinder bottom with clean water again by using the cylinder bottom nozzle, and simultaneously discharging waste water, wherein the time is set to be open and set according to requirements;
s6, calling manual confirmation after maintenance is finished;
s7, confirming that the maintenance is finished, automatically extracting the prepared tank liquor, and entering a working state;
s8, controlling a pneumatic valve through a PLC program after the last plate in the material waiting for shutdown passes through the horizontal line, so that liquid medicine in a booster pump extraction groove body in normal production is switched to be clear water in an extraction water supplementing bypass pipe, the liquid medicine in a pipeline system from the booster pump to a tail end nozzle is discharged, the pipeline system is prevented from being blocked due to the fact that the liquid medicine stops flowing and crystallizing, time is set to be open, and the time is set according to requirements.
The maintenance device comprises a horizontal line 10 and an infusion tube 1, wherein the upper end and the lower end of the horizontal line are symmetrically provided with spray pipes 2, the infusion tubes are respectively connected with the spray pipes, the spray pipes are connected with spray heads 21, and the spray heads face the horizontal line; a water replenishing and cleaning pipe 3 is arranged at one side of the infusion pipe, and a water replenishing bypass pipe 4 is arranged at one side of the water replenishing and cleaning pipe; the device also comprises a liquid return pipe 5 which is connected with a filtering component 6; a cylinder bottom spray pipe 7 is arranged below the horizontal line.
In the invention, a group of water replenishing bypass pipes controlled by pneumatic valves are added to the booster pump, and matched nozzles (cylinder bottom spray pipes) of the flushing spray pipes are added to the side walls and the spraying blind areas at the cylinder bottom and under the liquid level, so that the cleaning effect can be ensured.
Further, the device also comprises a booster pump 8 which is respectively connected with the infusion tube and the liquid return tube.
Further, a float valve 31 is arranged at a water outlet of the clean water replenishing pipe, and the liquid level height is tested.
Further, the device also comprises a swing frame 22, the swing frame is symmetrically arranged at the upper end and the lower end of the horizontal line, and the spray pipe is arranged on the swing frame.
Further, a drain pipe 9 is connected to the bottom of the maintenance device.
Further, a drain pneumatic valve 91 is arranged at the joint of the maintenance device and the drain pipe.
Further, the infusion tube, the liquid return tube, the clear water replenishing tube, the water replenishing bypass tube and the cylinder bottom nozzle are all provided with pneumatic valves 81.
Further, the filter assembly comprises a filter 61 and a precision filter 62 which are connected in sequence.
In the invention, the filter and the precision filter are matched for use, so that fine impurities and foreign matters can be effectively filtered, and the probability of blocking the spray head is reduced.
Further, the system also comprises a central control module (not labeled), and the central control module is respectively connected with the booster pump, the pneumatic valve and the drainage pneumatic valve.
Example 2
This embodiment provides a maintenance device having the same structure as that of embodiment 1, except that, further, the precision filter includes a combination of the following filter assemblies: ceramic membrane module, MBR membrane module.
Example 3
This embodiment provides a maintenance device having the same structure as that of embodiment 1, except that, further, the precision filter includes a combination of the following filter assemblies: fine filter assembly, tubular membrane assembly.
Example 4
This embodiment provides a maintenance device having the same structure as that of embodiment 1, except that, further, the precision filter includes a combination of the following filter assemblies: microfiltration component, ceramic membrane component, PVDF membrane component.
Example 5
This embodiment provides a maintenance device having the same structure as that of embodiment 1, except that, further, the precision filter includes a combination of the following filter assemblies: ceramic membrane module, tubular membrane module, MBR membrane module.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art. It should be noted that the technical features not described in detail in the present invention can be implemented by any prior art.
Claims (10)
1. A circuit board horizontal line automatic maintenance method is characterized by comprising a maintenance device, and comprises the following steps:
s1, after the circuit board is produced, starting a one-key program to enter an automatic maintenance program, and starting the circuit board after the circuit board passes a horizontal line;
s2, the central control module controls the pneumatic valve to make the developing spray pump extract the tank liquor, wash the bottom of the cylinder, stir up the liquid medicine sediment and control the discharge of the waste liquor;
s3, controlling the pneumatic valve through the central control module to enable the booster pump to pump clear water, and performing high-pressure cleaning on the spray pipe and the spray head by the clear water;
s4, starting a booster pump, closing a pneumatic valve of a spray pipe at the bottom of the cylinder, and washing the liquid medicine tank by using clear water by using an upper spray head and a lower spray head;
s5, starting a booster pump, closing pneumatic valves of branch liquid conveying pipes of the upper and lower swing frames, opening a pneumatic valve of a cylinder bottom nozzle, flushing the cylinder bottom with clean water again by using the cylinder bottom nozzle, and discharging waste water at the same time;
s6, calling manual confirmation after maintenance is finished;
s7, confirming that the maintenance is finished, automatically extracting the prepared tank liquor, and entering a working state;
s8, when the final plate in the material waiting for stopping is over the horizontal line, the pneumatic valve is controlled through the central control module, so that liquid medicine in the groove body extracted by the booster pump in normal production is switched to be clear water in the water replenishing bypass pipe, and the liquid medicine in the pipeline system from the booster pump to the tail end nozzle is discharged.
2. The automatic maintenance method for the horizontal line of the circuit board according to claim 1, wherein the maintenance device comprises a horizontal line and comprises an infusion tube, the upper end and the lower end of the horizontal line are symmetrically provided with spray tubes, the infusion tube is respectively connected with the spray tubes, the spray tubes are connected with spray heads, and the spray heads face the horizontal line;
a water replenishing and cleaning pipe is arranged at one side of the infusion pipe, and a water replenishing bypass pipe is arranged at one side of the water replenishing and cleaning pipe;
the filter also comprises a liquid return pipe, and the liquid return pipe is connected with a filter assembly;
and a cylinder bottom spray pipe is arranged below the horizontal line.
3. The automatic maintenance method for the horizontal line of the circuit board of claim 1, further comprising a booster pump, wherein the booster pump is respectively connected with the liquid conveying pipe and the liquid return pipe.
4. The automatic maintenance method for the horizontal line of the circuit board according to claim 1, wherein a ball float valve is arranged at the water outlet of the clean water replenishing pipe.
5. The automatic maintenance method for the horizontal line of the circuit board of claim 1, further comprising a swing frame, wherein the swing frame is symmetrically arranged at the upper end and the lower end of the horizontal line, and the spray pipe is arranged on the swing frame.
6. The automatic maintenance method for the horizontal line of the circuit board according to claim 3, wherein a drain pipe is connected to the bottom of the maintenance device; and a drainage pneumatic valve is arranged at the joint of the maintenance device and the drainage pipe.
7. The automatic maintenance method for the horizontal line of the circuit board according to claim 6, wherein the liquid conveying pipe, the liquid return pipe, the clean water replenishing pipe, the water replenishing bypass pipe and the cylinder bottom nozzle are all provided with pneumatic valves.
8. The automatic maintenance method for the horizontal line of the circuit board according to claim 1, wherein the filtering component comprises a filter and a precision filter which are connected in sequence.
9. The automatic maintenance method for the horizontal line of the circuit board according to claim 8, wherein the precision filter comprises at least one of the following filter components: microfiltration component, fine filtration component, ceramic membrane component, tubular membrane component, PVDF membrane component and MBR membrane component.
10. The automatic maintenance method for the horizontal line of the circuit board as claimed in claim 7, further comprising a central control module, wherein the central control module is respectively connected with a booster pump, a pneumatic valve and a drainage pneumatic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111475012.6A CN114130745A (en) | 2021-12-06 | 2021-12-06 | Automatic maintenance method for horizontal line of circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111475012.6A CN114130745A (en) | 2021-12-06 | 2021-12-06 | Automatic maintenance method for horizontal line of circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114130745A true CN114130745A (en) | 2022-03-04 |
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ID=80384444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111475012.6A Pending CN114130745A (en) | 2021-12-06 | 2021-12-06 | Automatic maintenance method for horizontal line of circuit board |
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| Country | Link |
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| CN (1) | CN114130745A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102036485A (en) * | 2010-09-30 | 2011-04-27 | 北大方正集团有限公司 | Spraying device and liquid medicine tank |
| CN206139601U (en) * | 2016-10-08 | 2017-05-03 | 茂名市银峰石化有限公司 | High -efficient cleaning system of oil tank |
| CN106694497A (en) * | 2015-07-13 | 2017-05-24 | 东莞市斯坦得电子材料有限公司 | Cleaning technology of developing trough for dry film/solder resist ink |
| CN206234617U (en) * | 2016-11-18 | 2017-06-09 | 红板（江西）有限公司 | A kind of circuit board plant production line automatic drain care device |
| WO2020190209A1 (en) * | 2019-03-18 | 2020-09-24 | Cyc International Pte. Ltd. | Method and system for cleaning a storage tank using a plurality of devices |
| CN217774930U (en) * | 2021-12-06 | 2022-11-11 | 广东喜珍电路科技有限公司 | Maintenance device applied to PCB horizontal line |
-
2021
- 2021-12-06 CN CN202111475012.6A patent/CN114130745A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102036485A (en) * | 2010-09-30 | 2011-04-27 | 北大方正集团有限公司 | Spraying device and liquid medicine tank |
| CN106694497A (en) * | 2015-07-13 | 2017-05-24 | 东莞市斯坦得电子材料有限公司 | Cleaning technology of developing trough for dry film/solder resist ink |
| CN206139601U (en) * | 2016-10-08 | 2017-05-03 | 茂名市银峰石化有限公司 | High -efficient cleaning system of oil tank |
| CN206234617U (en) * | 2016-11-18 | 2017-06-09 | 红板（江西）有限公司 | A kind of circuit board plant production line automatic drain care device |
| WO2020190209A1 (en) * | 2019-03-18 | 2020-09-24 | Cyc International Pte. Ltd. | Method and system for cleaning a storage tank using a plurality of devices |
| CN217774930U (en) * | 2021-12-06 | 2022-11-11 | 广东喜珍电路科技有限公司 | Maintenance device applied to PCB horizontal line |
Non-Patent Citations (1)
| Title |
|---|
| 岳德茂: "印刷科技实用手册 第3分册 印刷器材篇", vol. 1, 30 April 2010, 印刷工业出版社, pages: 232 * |
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