CN113492244A - External transmission mechanism for vacuum reflow soldering furnace - Google Patents
External transmission mechanism for vacuum reflow soldering furnace Download PDFInfo
- Publication number
- CN113492244A CN113492244A CN202010201025.3A CN202010201025A CN113492244A CN 113492244 A CN113492244 A CN 113492244A CN 202010201025 A CN202010201025 A CN 202010201025A CN 113492244 A CN113492244 A CN 113492244A
- Authority
- CN
- China
- Prior art keywords
- vacuum
- transmission shaft
- bearing
- reflow soldering
- soldering furnace
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 94
- 238000005476 soldering Methods 0.000 title claims abstract description 31
- 230000007246 mechanism Effects 0.000 title claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 42
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/04—Heating appliances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/42—Printed circuits
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to an external transmission mechanism for a vacuum reflow soldering furnace, which comprises a vacuum cavity connecting terminal, a transmission shaft, a fixed flange, a first bearing, a second bearing, a vacuum sealing ring and a transmission unit, wherein a vacuum cavity interface is arranged on the side wall of the vacuum reflow soldering furnace, the fixed flange is connected with a transmission shaft supporting seat in a sealing manner at the other end, the vacuum sealing ring is arranged between the fixed flanges, one end of the transmission shaft is connected with the vacuum cavity connecting terminal, the other end of the transmission shaft sequentially penetrates through the fixed flange and the transmission shaft supporting seat to be connected with the transmission unit, and the vacuum cavity connecting terminal extends into the vacuum cavity interface to be connected with an internal mechanism of the vacuum reflow soldering furnace. Compared with the prior art, the vacuum reflow soldering furnace has the advantages that the connection mode of the transmission mechanism and the vacuum reflow soldering furnace is simple, the vacuum reflow soldering furnace is convenient to install and disassemble at any time, meanwhile, the sealing of the transmission shaft at the fixed flange is ensured through the arrangement of the vacuum sealing ring, the air tightness in the vacuum reflow soldering furnace can be ensured, and the soldering quality of the electronic printed circuit board is improved.
Description
Technical Field
The invention relates to welding corollary equipment, in particular to an external transmission mechanism for a vacuum reflow oven.
Background
Reflow ovens (ReflowOven) are machines that reliably bond surface mounted components and circuit boards together by solder paste alloy by providing a heated environment that melts the solder paste. The vacuum reflow oven is a key device of surface mount technology in electronic manufacturing industry, the quality and operation of the vacuum reflow oven directly affect the quality of the final product, and once the soldering process is completed, if the defective soldering point, component or circuit board is repaired, the process becomes very complicated and expensive.
With the development of the electronic industry towards miniaturization and multi-specification directions, the requirements on the product quality are higher and higher, and in order to meet the new market requirements and reduce the product defects caused by welding, the vacuum reflow oven with the vacuum device gradually starts to be widely applied. The vacuum device can effectively reduce the size and the number of soldering tin cavities during welding of the reflow oven, and improve the welding quality.
However, the vacuum apparatus is installed inside the vacuum reflow furnace, and the transmission mechanism and the sealing performance are required to be high. At present, only a common driving mechanism sold in the market can be adopted for driving, so that the whole air tightness in the vacuum reflow soldering furnace is deteriorated, and the soldering quality is influenced. Meanwhile, the internal temperature of the vacuum reflow soldering furnace is very high, and a common driving mechanism is not heat-resistant, is easy to deform and has short service life.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an external transmission mechanism for a vacuum reflow oven.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an external drive mechanism for vacuum reflow soldering stove, includes vacuum cavity connecting terminal, transmission shaft, mounting flange, first bearing, second bearing, vacuum seal circle and drive unit, is equipped with the vacuum cavity interface on the lateral wall of vacuum reflow soldering stove, mounting flange, other end sealing connection transmission shaft supporting seat, the vacuum seal circle sets up between mounting flange, vacuum cavity connecting terminal is connected to the one end of transmission shaft, and the other end of transmission shaft passes mounting flange and transmission shaft supporting seat connection drive unit in proper order, first bearing sets up between transmission shaft and mounting flange, the second bearing set up between transmission shaft and transmission shaft supporting seat, vacuum cavity connecting terminal gos deep into the internal mechanism of vacuum cavity interface in-connection vacuum reflow soldering stove.
Further, the first bearing is a graphite bearing.
Furthermore, the transmission shaft supporting seat is provided with a nitrogen gas circuit joint for connecting a nitrogen gas pump, and nitrogen gas is filled between the transmission shaft and the transmission shaft supporting seat.
Further, the second bearing is a ball bearing.
Furthermore, the vacuum cavity connecting terminal is connected with the transmission shaft through a pin.
Furthermore, a sealing O-shaped ring is arranged between the fixing flange and the vacuum cavity interface, one end of the fixing flange is provided with a sealing groove, and the sealing O-shaped ring is embedded into the sealing groove and then contacts with the end face of the vacuum cavity interface to form a sealing structure.
Furthermore, the first bearing is limited in the fixing flange through a hoop and a vacuum sealing ring.
Furthermore, the transmission unit is a chain wheel assembly and is used for connecting an external motor.
Compared with the prior art, the invention has the following advantages:
1. the vacuum reflow soldering furnace has the advantages that the connection mode of the transmission mechanism and the vacuum reflow soldering furnace is simple, the vacuum reflow soldering furnace is convenient to install and disassemble at any time, meanwhile, the sealing of the transmission shaft at the fixed flange is ensured through the arrangement of the vacuum sealing ring, the air tightness in the vacuum reflow soldering furnace can be ensured, and the quality of soldering work is improved.
2. The transmission shaft supporting seat is provided with a nitrogen gas circuit joint, and after nitrogen gas is filled between the transmission shaft and the transmission shaft supporting seat, the nitrogen gas can only be discharged from the second bearing because the rear end of the first bearing is provided with a vacuum sealing ring. Through the arrangement of the structure, when the vacuum sealing ring leaks in a micro-scale manner, only a small amount of nitrogen enters the vacuum reflow soldering furnace, so that the external air is prevented from entering the vacuum reflow soldering furnace to cause local welding oxidation, and the effect of further sealing is achieved.
3. The first bearing adopts a graphite bearing, is high temperature resistant and not easy to deform, and simultaneously, the graphite bearing has a self-lubricating effect at high temperature, so that the service life of the mechanism can be prolonged.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an exploded view of the present invention.
Fig. 3 is an exploded view of another aspect of the present invention.
Reference numerals: 1. the device comprises a vacuum cavity connecting terminal, 2, a transmission shaft, 3, a fixing flange, 31, a sealing O-shaped ring, 32, a sealing groove, 33, a hoop, 4, a transmission shaft supporting seat, 5, a first bearing, 6, a second bearing, 7, a vacuum sealing ring, 8, a transmission unit, 9, a nitrogen gas path connector, 10, a vacuum reflow soldering furnace, 101, a vacuum cavity interface, 11, a pin, 12 and a motor.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 to fig. 3, the present embodiment provides an external transmission mechanism for a vacuum reflow oven, which includes a vacuum cavity connection terminal 1, a transmission shaft 2, a fixing flange 3, a transmission shaft support base 4, a first bearing 5, a second bearing 6, a vacuum seal ring 7, and a transmission unit 8.
The side wall of the vacuum reflow oven 10 is provided with a vacuum cavity interface 101, one end of the fixed flange 3 is hermetically connected with the vacuum cavity interface 101 through a bolt, and the other end of the fixed flange is hermetically connected with the transmission shaft supporting seat 4 through a bolt. A sealing O-shaped ring 31 is further arranged between the fixing flange 3 and the vacuum cavity connector 101, a sealing groove 32 is formed in one end of the fixing flange 3, the sealing O-shaped ring 31 is embedded into the sealing groove 32 and then contacts with the end face of the vacuum cavity connector 101, and a sealing layer is formed by compression to form a sealing structure. Thereby, the space between the fixing flange 3 and the vacuum chamber port 101 is sealed to prevent gas leakage.
One end of the transmission shaft 2 is connected with the vacuum cavity connecting terminal 1 through a pin 11, and the other end of the transmission shaft penetrates through the fixed flange 3 and the transmission shaft supporting seat 4 in sequence to be connected with the transmission unit 8. The first bearing 5 is arranged between the transmission shaft 2 and the fixed flange 3, and specifically, the first bearing 5 is limited in the fixed flange 3 through a clamp 33 and a vacuum sealing ring 7. The second bearing 6 is arranged between the transmission shaft 2 and the transmission shaft support 4, in particular at one end close to the transmission unit 8. The vacuum chamber connection terminal 1 is inserted into the vacuum chamber port 101 to connect the internal mechanism of the vacuum reflow furnace 10.
The vacuum sealing ring 7 is arranged between the fixed flange 3 and the transmission shaft supporting seat 4 and is nested on the outer ring of the transmission shaft 2. When the transmission shaft 2 rotates, the vacuum sealing ring 7 is directly wrapped on the outer surface of the transmission shaft 2 to play a sealing role.
In this embodiment, the first bearing 5 is a graphite bearing; the second bearing 6 is a ball bearing.
And a nitrogen gas circuit joint 9 is arranged on the transmission shaft supporting seat 4 and is used for connecting a nitrogen gas pump, and nitrogen gas is filled between the transmission shaft 2 and the transmission shaft supporting seat 4.
The transmission unit 8 is a chain wheel assembly and is used for connecting an external motor 12. The sprocket assembly comprises a chain and a sprocket connected to a drive shaft 2.
The working principle of the embodiment is as follows:
one end of the external transmission mechanism is a chain wheel component which is connected with the motor 12 through a chain. When the motor 12 rotates, the output torque of the motor 12 will drive the chain to move, and the chain will drive the chain wheel to rotate. Because the chain wheel and the transmission shaft 2 are fixed together, and two ends of the transmission shaft 2 are respectively supported by the first bearing 5 and the second bearing 6, the transmission shaft 2 is driven by the chain wheel to rotate around the axis of the transmission shaft, so that the vacuum cavity connecting terminal 1 at the other end is driven to rotate; the vacuum chamber connection terminal 1 is to be connected to other moving mechanisms in the vacuum chamber. Therefore, the output torque from the motor 12 will be transmitted through the external transmission mechanism, and the torque outside the vacuum cavity is transmitted into the vacuum cavity to drive the movement mechanism inside the vacuum cavity to move.
The other end of the external transmission mechanism is provided with a fixed flange 3, and a sealing O-shaped ring 31 is arranged on the fixed flange 3. The fixing flange 3 is fixed on the vacuum cavity interface 101 through bolts, the vacuum cavity connecting terminal 1 extends into the vacuum cavity, and the sealing O-shaped ring 31 plays a role in sealing and preventing gas leakage; the transmission shaft 2 is provided with a graphite bearing (a first bearing 5) and a ball bearing (a second bearing 6), and the graphite bearing can resist high temperature and simultaneously has the functions of lubrication and supporting rotation; the ball bearing has small friction coefficient, can well support the transmission shaft 2 to rotate and improve the working efficiency; a vacuum seal ring 7 is arranged between the transmission shaft supporting seat 4 and the fixed flange 3, and the vacuum seal ring 7 is wrapped on the vacuum transmission shaft 2 to prevent external air from entering the vacuum cavity through a gap between the transmission shaft 2 and the graphite bearing, so that the air tightness of the vacuum cavity is influenced. The nitrogen gas circuit joint 9 can be connected with pure nitrogen provided by a factory, so that oxygen in the external environment is prevented from leaking into the hearth, the oxygen concentration of gas in the hearth is increased, and the welding quality of a product is influenced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. An external transmission mechanism for a vacuum reflow soldering furnace is characterized by comprising a vacuum cavity connecting terminal (1), a transmission shaft (2), a fixing flange (3), a transmission shaft supporting seat (4), a first bearing (5), a second bearing (6), a vacuum sealing ring (7) and a transmission unit (8), wherein the side wall of the vacuum reflow soldering furnace (10) is provided with a vacuum cavity interface (101), one end of the fixing flange (3) is hermetically connected with the vacuum cavity interface (101), the other end of the fixing flange (3) is hermetically connected with the transmission shaft supporting seat (4), the vacuum sealing ring (7) is arranged between the fixing flange (3) and the transmission shaft supporting seat (4), one end of the transmission shaft (2) is connected with the vacuum cavity connecting terminal (1), and the other end of the transmission shaft (2) sequentially penetrates through the fixing flange (3) and the transmission shaft supporting seat (4) to be connected with the transmission unit (8), the vacuum reflow soldering furnace is characterized in that the first bearing (5) is arranged between the transmission shaft (2) and the fixing flange (3), the second bearing (6) is arranged between the transmission shaft (2) and the transmission shaft supporting seat (4), and the vacuum cavity connecting terminal (1) penetrates into the vacuum cavity interface (101) to be connected with an internal mechanism of the vacuum reflow soldering furnace (10).
2. An external transmission mechanism for a vacuum reflow oven according to claim 1, wherein the first bearing (5) is a graphite bearing.
3. The external transmission mechanism for the vacuum reflow oven according to claim 1, wherein the transmission shaft support base (4) is provided with a nitrogen gas path connector (9) for connecting a nitrogen gas pump, and nitrogen gas is filled between the transmission shaft (2) and the transmission shaft support base (4).
4. An external transmission mechanism for a vacuum reflow oven according to claim 1, wherein the second bearing (6) is a ball bearing.
5. An external transmission mechanism for a vacuum reflow oven according to claim 1, wherein the vacuum chamber connection terminal (1) is connected to the transmission shaft (2) through a pin (11).
6. The external transmission mechanism for the vacuum reflow oven according to claim 1, wherein a sealing O-ring (31) is arranged between the fixing flange (3) and the vacuum cavity interface (101), a sealing groove (32) is arranged at one end of the fixing flange (3), and the sealing O-ring (31) is embedded into the sealing groove (32) and then contacts with the end surface of the vacuum cavity interface (101) to form a sealing structure.
7. An external transmission mechanism for a vacuum reflow oven according to claim 1, wherein the first bearing (5) is limited in the fixing flange (3) by a clamp (33) and a vacuum sealing ring (7).
8. The external transmission mechanism for the vacuum reflow oven according to claim 1, wherein the transmission unit (8) is a chain wheel assembly for connecting with an external motor (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010201025.3A CN113492244B (en) | 2020-03-20 | 2020-03-20 | External transmission mechanism for vacuum reflow oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010201025.3A CN113492244B (en) | 2020-03-20 | 2020-03-20 | External transmission mechanism for vacuum reflow oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113492244A true CN113492244A (en) | 2021-10-12 |
| CN113492244B CN113492244B (en) | 2024-07-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010201025.3A Active CN113492244B (en) | 2020-03-20 | 2020-03-20 | External transmission mechanism for vacuum reflow oven |
Country Status (1)
| Country | Link |
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| CN (1) | CN113492244B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116000401A (en) * | 2023-02-24 | 2023-04-25 | 芯朋半导体科技(如东)有限公司 | Soldering vacuum furnace |
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|---|---|---|---|---|
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| JPH11247957A (en) * | 1998-02-27 | 1999-09-14 | Anelva Corp | Rack and pinion drive mechanism in vacuum processing device |
| CN2588134Y (en) * | 2002-12-02 | 2003-11-26 | 沈阳聚智电子科技有限公司 | Seal transmission device |
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
| CN101958264A (en) * | 2010-05-06 | 2011-01-26 | 东莞宏威数码机械有限公司 | Dustless vacuum power transfer unit |
| CN103046014A (en) * | 2012-12-31 | 2013-04-17 | 上海子创镀膜技术有限公司 | Magnetically-controlled sputter coating vacuum transmission mechanism |
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| CN206600270U (en) * | 2017-04-12 | 2017-10-31 | 宁波鲍斯能源装备股份有限公司 | A kind of dry type vacuum pump rotor axle sealing structure |
| CN209604543U (en) * | 2019-01-02 | 2019-11-08 | 广州市方圆机械设备有限公司 | A kind of vacuum seal structure of motor drive |
| CN212094758U (en) * | 2020-03-20 | 2020-12-08 | 上海朗仕电子设备有限公司 | External transmission mechanism for vacuum reflow soldering furnace |
-
2020
- 2020-03-20 CN CN202010201025.3A patent/CN113492244B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2039773U (en) * | 1988-05-21 | 1989-06-21 | 钟汉辉 | Sealed deceleration machine |
| JPH11247957A (en) * | 1998-02-27 | 1999-09-14 | Anelva Corp | Rack and pinion drive mechanism in vacuum processing device |
| CN2588134Y (en) * | 2002-12-02 | 2003-11-26 | 沈阳聚智电子科技有限公司 | Seal transmission device |
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
| CN101958264A (en) * | 2010-05-06 | 2011-01-26 | 东莞宏威数码机械有限公司 | Dustless vacuum power transfer unit |
| CN103046014A (en) * | 2012-12-31 | 2013-04-17 | 上海子创镀膜技术有限公司 | Magnetically-controlled sputter coating vacuum transmission mechanism |
| CN203868342U (en) * | 2014-05-16 | 2014-10-08 | 埃慕迪磁电科技(上海)有限公司 | Magnetic fluid sealing device for vacuum melting transmission mechanism |
| CN206600270U (en) * | 2017-04-12 | 2017-10-31 | 宁波鲍斯能源装备股份有限公司 | A kind of dry type vacuum pump rotor axle sealing structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116000401A (en) * | 2023-02-24 | 2023-04-25 | 芯朋半导体科技(如东)有限公司 | Soldering vacuum furnace |
| CN116000401B (en) * | 2023-02-24 | 2023-09-12 | 芯朋半导体科技(如东)有限公司 | Soldering vacuum furnace |
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| Publication number | Publication date |
|---|---|
| CN113492244B (en) | 2024-07-16 |
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