CN112207418A - Micro-channel aluminum heat pipe pre-extrusion narrow-weld-joint spherical friction stir welding perfusion packaging process - Google Patents
Micro-channel aluminum heat pipe pre-extrusion narrow-weld-joint spherical friction stir welding perfusion packaging process Download PDFInfo
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- CN112207418A CN112207418A CN202011021686.4A CN202011021686A CN112207418A CN 112207418 A CN112207418 A CN 112207418A CN 202011021686 A CN202011021686 A CN 202011021686A CN 112207418 A CN112207418 A CN 112207418A
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- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
- B23K20/126—Workpiece support, i.e. backing or clamping
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- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
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Abstract
The invention belongs to the field of device packaging and heat dissipation, and relates to a micro-channel aluminum heat pipe pre-extrusion narrow-weld spherical friction stir welding perfusion packaging process, which mainly comprises the following steps: 1) pumping the environment in the micro heat pipe subjected to unilateral sealing to a high vacuum state; 2) pouring a certain amount of working medium into the micro heat pipe; 3) extruding and sealing by using an extruding and sealing device; 4) carrying out micro heat pipe welding sealing by using a spherical friction stir welding process, wherein the welding direction is along the position of an extrusion sealing line 1/2; 5) cutting along the direction of the welding line at the position of the welding line 1/2 by using a cutting device, and finishing the perfusion packaging process of the micro heat pipe unit; 6) the evacuation device and the infusion device are removed. The invention can complete the manufacture of the micro-channel aluminum heat pipe unit only by 5 procedures, greatly shortens the middle sealing and blanking section, simplifies the processing and manufacturing flow, and has the advantages of high material utilization rate, good packaging effect, high reliability, low rejection rate, high production efficiency, long service life of the spherical stirring head and green and environment-friendly production process.
Description
Technical Field
The invention belongs to the field of device packaging and heat dissipation, and relates to a micro-channel aluminum heat pipe pre-extrusion narrow-weld spherical friction stir welding perfusion packaging process.
Background
The micro-channel aluminum flat tube is a thin-wall porous flat tubular part formed by a refined aluminum bar through a split-flow welding extrusion process, and is a key part of a new generation of parallel flow type micro-channel air-conditioning heat exchanger (micro heat pipe). The heat transfer performance of the micro heat pipe is influenced by factors such as working medium perfusion amount, perfusion vacuum degree, working inclination angle, internal channel structure and the like, so that the heat transfer performance of the micro heat pipe depends on the perfusion packaging process of the micro heat pipe to a great extent.
At present, two types of vacuumizing perfusion technology and perfusion vacuumizing technology are mainly adopted in the manufacturing technology of the micro-channel aluminum heat pipe, wherein the vacuumizing perfusion technology and the perfusion vacuumizing technology are adopted in the manufacturing technology, a working medium is perfused after the environment in the micro-channel aluminum flat pipe is pumped to high vacuum by high vacuumizing equipment, then a sealing device is adopted for sealing and blanking, a certain amount of working medium is perfused in the micro-channel aluminum flat pipe in the sealing technology, then twice vacuumizing is carried out (the degree of vacuum of primary degassing is lower, and the secondary degassing prevents an overlarge working dead zone), and finally the sealing device is used for sealing. The two pouring and packaging technologies need about 20 working procedures in actual production, and have complex process and low production efficiency. And the sealing devices required by the sealing devices usually consist of a sealing die and a blanking cutter, when the sealing die is worn or the distribution of the micro heat pipe materials is uneven, some micro channels cannot be successfully sealed to cause product scrapping, and the grinding adjustment of the sealing devices is required regularly in order to reduce the rejection rate of the sealing and ensure the sealing quality. In order to prevent the working medium from leaking from the seal during the operation of the micro heat pipe and improve the reliability of the seal, the seal is usually welded by a fusion welding method. Moreover, one end of the aluminum flat tube needs to be sealed in advance before production every time, and the material utilization rate is reduced due to the overlong blanking section. The existing micro heat pipe perfusion packaging technology has the advantages of low material utilization rate, complex production process, low production efficiency and high rejection rate.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a micro-channel aluminum heat pipe pre-extrusion narrow-weld spherical friction stir welding perfusion packaging process, which utilizes a spherical stirring head to carry out micro-heat pipe high-efficiency high-quality perfusion packaging according to an optimized friction stir welding process. The micro heat pipe filling and packaging can be realized only by one-time clamping, vacuumizing, filling, one-time extrusion sealing and one-time spherical friction stir welding sealing, the processing and manufacturing flow is greatly shortened, the spherical stirring head basically has no abrasion problem, the service life is long, the reliability is high, the rejection rate is low, the production efficiency is high, a blanking section with overlong length is not required to be reserved at the sealing position, the material utilization rate is high, the requirement on packaging equipment is low, and the economy is better.
The technical scheme for solving the problems is as follows: the micro-channel aluminum heat pipe pre-extrusion narrow-weld spherical friction stir welding perfusion packaging process is characterized by comprising the following steps of:
1) tooling positioning and single-side sealing
Clamping and fixing the micro heat pipe on a tool table, sealing the starting end of the micro heat pipe on a single side by using an extrusion sealing device and a spherical friction stir welding sealing process, moving the micro heat pipe until a sealing line is positioned above a lower extrusion sealing die, and then communicating a vacuumizing device and a filling device with a filling end of the micro heat pipe;
2) high vacuum pumping-perfusion
The vacuumizing device starts to work, the environment in the wall shell of the micro heat pipe is pumped to a high vacuum state, the micro heat pipe is kept still so as to keep the high vacuum state, then the filling device starts to work, and a certain amount of working medium is filled into the micro heat pipe;
3) extrusion sealing
Extruding the sealing line of the micro heat pipe blank by utilizing an upper extrusion sealing die and the lower half part of an extrusion sealing device;
4) spherical friction stir welding seal
Pricking a ball head of a high-speed rotating spherical stirring head into the surface of the micro heat pipe, preheating in situ, then carrying out friction stir welding along a sealing line of a blank of the micro heat pipe, continuously carrying out friction heating on the ball head of the high-speed rotating spherical stirring head at an end point after welding to ensure the welding effect of the end point, and finishing the friction stir welding sealing process of the first micro heat pipe unit;
5) cutting and blanking
Cutting off the first welded and sealed micro heat pipe unit along the sealing line 1/2 by a cutting device, and completing the manufacturing of the first micro heat pipe unit;
6) circulation manufacturing of micro heat pipe unit
And (5) repeatedly processing the micro heat pipe unit according to the steps 2) to 5) until the production requirement is completed, and finally removing the vacuumizing device and the filling device.
Further, in the step 3), the extrusion sealing specifically includes: the upper die of the extrusion seal is positioned above the starting point of the sealing line of the micro heat pipe blank, the upper half part of the extrusion seal device is fed downwards, the lower half part of the extrusion seal device is fed upwards, the upper part and the lower part of the extrusion seal device are contacted with the inside of the aluminum heat pipe wall shell at the sealing position of the micro heat pipe blank up and down, the sealing position is vertically symmetrical, the upper die of the extrusion seal moves upwards to leave the micro heat pipe blank after the sealing is finished, the position of the lower die of the extrusion seal is kept unchanged, and the direction of the extrusion seal.
Further, in the step 4), the spherical stirring head is pricked into the upper surface of the micro heat pipe blank, the feeding speed is 10 mm/min-50 mm/min, and the pressing amount of the ball head is 0.05 mm-0.3 mm.
Further, in the step 4), after the high-speed rotating spherical stirring head performs welding preheating on the starting point of the sealing line at the tail end of the first micro heat pipe unit for 2s to 8s, performing friction stir welding along the sealing line at the tail end of the first micro heat pipe unit of the micro heat pipe blank, wherein the welding speed is 50mm/min to 200 mm/min.
Further, in the step 4), after welding, the spherical stirring head rotating at a high speed continuously performs friction heating at the end point for 3-5 s to ensure the welding effect of the end point.
Further, in the step 5), after the cutting is completed, the remaining 1/2 of the welding seam on the sealing line on the blank can be used as the starting end seal of the second channel thermite unit.
Further, in the step 4), the process parameters such as the rotation speed, the feeding speed, the pressing amount and the like of the spherical friction stir head are adjusted according to the geometric dimension of the micro heat pipe unit and the required forming effect.
Further, the width of the welding seam on the sealing line can be adjusted according to production requirements, and the minimum width of the welding seam can be controlled to be about 5 millimeters.
The invention has the advantages that:
(1) compared with the traditional filling process, the invention is simple and convenient, can complete the manufacturing of the micro heat pipe unit by only needing 5 procedures of one-time clamping, one-time extrusion sealing, one-time vacuum pumping and the like, is simple and convenient to operate, and greatly improves the filling and packaging efficiency of the micro heat pipe unit; the method does not need the complicated steps of pre-sealing and secondary degassing of the sealing end in the traditional process, the problem of working medium leakage cannot exist in the spherical friction stir welding sealing process, and the spherical friction stir welding sealing mechanism of the micro heat pipe is metallurgical bonding, so that the obtained micro heat pipe seal has good air tightness, good forming effect and high reliability;
(2) the sealing weld joint at the tail end of the first micro heat pipe unit is used as the sealing weld joint at the starting end of the second micro heat pipe unit, the sealing weld joint of the spherical friction stir welding has narrow width and can be adjusted according to production requirements, the minimum weld joint width can be controlled to be about 5mm, and the width is far smaller than the width of a blanking section and a sealing section in the packaging process of the traditional micro heat pipe by utilizing a special sealing mould to extrude and seal in cooperation with fusion welding, and the material section does not need to be additionally reserved in the continuous production process of the invention, thereby greatly improving the material utilization rate, and the production process has simple operation, short flow and high production efficiency;
(3) the spherical stirring head used in the invention can not pierce the micro heat pipe to cause working medium leakage, and the spherical stirring head can not be worn basically, thereby greatly reducing the production cost.
(4) In the continuous production process, the end sealing of the first micro heat pipe unit and the starting end sealing of the second micro heat pipe unit can be realized by one-time extrusion sealing of the die and one-time welding of the spherical friction stir welding sealing method.
(5) Compared with the traditional sealing die, the sealing method by extrusion, press, combination and fusion welding is simple and convenient, the service life of the tool head is longer, the friction stir welding belongs to solid phase welding, the welding seam has no fusion welding common defects of air holes, splashing, slag inclusion and the like, the obtained micro heat pipe unit has good sealing quality and high yield, no waste gas or smoke is generated in the welding and sealing process, no light pollution is generated, and the sealing process is green and environment-friendly.
Drawings
FIG. 1 is a flow chart of the potting process of the present invention;
FIG. 2 is a schematic diagram of the operation of the potting process of the present invention;
FIG. 3 is a schematic view of the operation of the squeeze seal of the present invention;
FIG. 4 is a schematic diagram of the ball-shaped friction stir welding encapsulation operation of the present invention;
FIG. 5 is a schematic view of a spherical stirring head according to the present invention;
fig. 6 is a schematic view of a micro heat pipe unit according to the present invention.
The reference numbers in the figures illustrate:
1. a tooling table is arranged on the machine tool,
2. a micro heat pipe blank 201, a starting end sealing line 202, a sealing line 203, a micro heat pipe unit,
3. a processing device 301, an upper half part of a squeezing sealing device 302, a spherical friction stir welding sealing device 303, a cutting device 304, a cutting head 305, a spherical friction stir head 306, an upper die of the squeezing sealing device 307, a lower die of the squeezing sealing device 308, a lower half part of the squeezing sealing device,
4. a vacuum-pumping device is arranged on the vacuum-pumping device,
5. and (4) a perfusion device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Referring to fig. 1 and 2, the micro-channel aluminum heat pipe pre-extrusion narrow-weld spherical friction stir welding perfusion packaging process mainly comprises five steps of tool positioning and single-side sealing, vacuumizing-perfusion, extrusion sealing, spherical friction stir welding sealing and cutting blanking, and the manufacturing of one micro heat pipe unit 203 is completed mainly by a tool table 1, a micro heat pipe blank 2 to be sealed, an upper half part 301 of an extrusion sealing device in a processing device 3, a lower half part 308 of the extrusion sealing device, a friction stir welding sealing device 302, a cutting device 303, a vacuumizing device 4 and a perfusion device 5. The vacuum device 4 and the filling device 5 are kept communicated and airtight during the whole packaging manufacturing process. The tool table 1 is used for clamping a micro heat pipe blank 2, the upper half part 301 and the lower half part 308 of the extrusion sealing device are used for sealing the micro heat pipe at one time, the friction stir welding sealing device 302 is used for spherical friction stir welding packaging of the micro heat pipe, the cutting device 303 is used for cutting and blanking of a packaged micro heat pipe unit, the vacuumizing device 4 is used for vacuumizing the environment in the wall shell of the micro heat pipe blank 2 and keeping a high vacuum state, and the filling device 5 is used for quantitatively filling working media into the micro heat pipe.
The micro-channel aluminum heat pipe pre-extrusion narrow-weld spherical friction stir welding perfusion packaging process comprises the following steps:
1) tooling positioning and single-side sealing
Referring to fig. 1 and fig. 6, a micro heat pipe blank 2 is clamped and fixed on a tooling table 1, a sealing line 201 at the starting end of the micro heat pipe blank 2 is sealed on one side by using an extrusion sealing and spherical friction stir welding sealing process, and then a vacuumizing device 4 and a filling device 5 are communicated with the filling end of the micro heat pipe blank 2;
2) high vacuum pumping-perfusion
Referring to fig. 2, the vacuumizing device 4 starts to work, the internal environment of the wall shell of the micro heat pipe blank 2 is pumped to a high vacuum state, the micro heat pipe blank 2 is kept still so as to keep the high vacuum state, then the filling device 5 starts to work, and a certain amount of working medium is filled into the micro heat pipe blank 2;
3) extrusion sealing
Referring to fig. 2 and fig. 3, the extrusion sealing upper die 306 is positioned above the starting point of the line 201 to be sealed of the micro heat pipe blank 2, the upper half 301 of the extrusion sealing device is fed downwards, the lower half 308 of the extrusion sealing device is fed upwards, no gap is contacted up and down in the aluminum heat pipe wall shell at the sealing position 202 of the micro heat pipe blank 2, the sealing position is symmetrical up and down, the extrusion sealing upper die 306 moves upwards to leave the micro heat pipe blank 2 after the sealing is completed, the position of the extrusion sealing lower die 307 is kept unchanged, and the extrusion sealing direction is perpendicular to the extension direction of the micro channel;
4) spherical friction stir welding seal
Referring to fig. 2, 3 and 6, the upper half part 301 of the extrusion sealing device, the spherical friction stir welding sealing device 302 and the cutting device 303 integrally move to the left by one station, the spherical stirring head 305 is positioned above the starting point of the line to be sealed of the micro heat pipe, the spherical stirring head 305 is vertical to the surface of the micro heat pipe blank 2, the spherical stirring head 305 rotating at a high speed moves downwards, the feeding speed is 10 mm/min-50 mm/min, the ball head of the spherical stirring head 305 is inserted into the surface of the micro heat pipe, the pressing amount of the ball head is 0.05 mm-0.15 mm, the spherical stirring head 305 rotating at a high speed is preheated in situ for 2 s-8 s, then the spherical stirring head 305 rotating at a high speed is subjected to friction stir welding along the line 202 to be sealed of the micro heat pipe blank 2, the welding speed is 50 mm/min-200 mm/min, and the spherical stirring head 305 rotating at a high speed continuously rubs and heats for 3 s-5, finally, the spherical stirring head 305 moves upwards to leave the micro heat pipe blank 2, and the feeding speed is 50 mm/min-200 mm/min. The first micro heat pipe unit 203 is friction stir welded and sealed.
5) Cutting and blanking
Referring to fig. 2 and 6, the upper half 301 of the extrusion sealer, the ball-shaped friction stir welding sealer 302 and the cutter 303 are integrally moved to the left by one station, the cutter head 304 is started to work and is fed downwards to cut the first welded and sealed micro heat pipe unit 203 along the position 1/2 of the weld 202, and the first micro heat pipe unit 203 is manufactured.
6) Circulation manufacturing of micro heat pipe unit
Referring to fig. 1 and 2, the upper half part 301 of the extrusion sealing device, the spherical friction stir welding sealing device 302 and the cutting device 303 move to the right integrally for two stations, the tool table 1 moves to the left by one micro heat pipe unit length, the lower half part 308 of the extrusion sealing device moves downwards to the lower extrusion sealing die 307 which is positioned below the upper plane of the tool table, the micro heat pipe unit is repeatedly processed according to the steps 2) -5) until the production requirement is completed, and finally the vacuumizing device 4 and the filling device 5 are removed.
Further, the moving length of the tooling table 1 in the circulating manufacturing process of the micro heat pipe unit can be adjusted according to the length requirement of the micro heat pipe unit, so that the operability of spherical friction stir welding sealing and cutting blanking is ensured, and the production and processing efficiency is improved.
Further, the rotation speed, feeding speed and pressing amount of the spherical friction stir head 302 according to the present invention are adjusted according to the size of the micro heat pipe blank 2 and the required forming effect.
Furthermore, the width of the sealing weld seam of the spherical friction stir welding is narrow and can be adjusted according to production requirements, and the minimum weld seam width can be controlled to be about 5 millimeters.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, or applied directly or indirectly to other related systems, are included in the scope of the present invention.
Claims (8)
1. The micro-channel aluminum heat pipe pre-extrusion narrow-weld spherical friction stir welding perfusion packaging process is characterized by comprising the following steps of:
1) tooling positioning and single-side sealing
Clamping and fixing a micro heat pipe blank (2) on a tool table (1), carrying out unilateral sealing on a sealing line (201) at the starting end of the micro heat pipe blank (2) by utilizing an extrusion sealing and spherical friction stir welding sealing process, and then communicating a vacuumizing device (4) and a filling device (5) with the filling end of the micro heat pipe blank (2);
2) high vacuum pumping-perfusion
Utilizing a vacuumizing device (4) to pump the environment in the wall shell of the micro heat pipe blank (2) to a high vacuum state, and then pouring working media into the micro heat pipe blank (2);
3) extrusion sealing
Extruding the sealing line (202) of the micro heat pipe blank (2) by utilizing an upper extrusion sealing die (306) and a lower extrusion sealing device half part (308);
4) spherical friction stir welding seal
Pricking a ball head of a high-speed rotating spherical stirring head (305) into the surface of the micro heat pipe, preheating in situ, then carrying out friction stir welding along a sealing line (202) of the micro heat pipe blank (2), continuously carrying out friction heating on the spherical stirring head (305) at an end point after welding to ensure the welding effect of the end point, and ending the friction stir welding sealing process of the first micro heat pipe unit (203);
5) cutting and blanking
Cutting a first welded and sealed micro heat pipe unit (203) along the 1/2 position of a sealing line (202) by a cutting head (304), and finishing the manufacturing of the first micro heat pipe unit (203);
6) circulation manufacturing of micro heat pipe unit
And (4) repeatedly processing the micro heat pipe unit according to the steps 2) to 5) until the production requirement is completed, and finally removing the vacuumizing device (4) and the filling device (5).
2. The micro-channel aluminum heat pipe pre-extrusion narrow weld spherical friction stir welding perfusion packaging process of claim 1, characterized in that,
in the step 3), the extrusion sealing specifically comprises the following steps: an upper extrusion sealing die (306) is positioned above the starting point of a sealing line (202) of the micro heat pipe blank (2), the upper half part (301) of the extrusion sealing device feeds downwards, the lower half part (308) of the extrusion sealing device feeds upwards, the upper part and the lower part of the extrusion sealing device are contacted without a gap in the aluminum heat pipe wall shell at the sealing position (202) of the micro heat pipe blank (2), the sealing position is symmetrical up and down, the upper extrusion sealing die (306) moves upwards to leave the micro heat pipe blank (2) after the sealing is finished, the position of the lower extrusion sealing die (307) is kept unchanged, and the extrusion sealing direction is perpendicular to the extension direction of a micro channel.
3. The micro-channel aluminum heat pipe pre-extrusion narrow weld spherical friction stir welding perfusion packaging process of claim 2, characterized in that,
in the step 4), a spherical stirring head (305) is pricked into the upper surface of the micro heat pipe blank (2), the feeding speed is 10 mm/min-50 mm/min, and the pressing amount of a ball head is 0.05 mm-0.3 mm.
4. The micro-channel aluminum heat pipe pre-extrusion narrow weld spherical friction stir welding perfusion packaging process of claim 3, characterized in that,
in the step 4), after welding and preheating the starting point of the sealing line (202) at the tail end of the first micro heat pipe unit for 2-8 s by the high-speed rotating spherical stirring head (305), carrying out friction stir welding along the sealing line (202) at the tail end of the first micro heat pipe unit of the micro heat pipe blank (2), wherein the welding speed is 50-200 mm/min.
5. The micro-channel aluminum heat pipe pre-extrusion narrow weld spherical friction stir welding perfusion packaging process of claim 4, characterized in that,
and 4), after welding is finished, the spherical stirring head (305) rotating at a high speed continuously rubs and heats for 3-5 s at the end point to ensure the welding effect of the end point.
6. The micro-channel aluminum heat pipe pre-extrusion narrow weld spherical friction stir welding perfusion packaging process of claim 5, characterized in that,
in step 5), after the cutting is finished, the residual 1/2 of the welding seam on the sealing line (202) on the blank can be used as the starting end sealing of the second channel thermite unit.
7. The micro-channel aluminum heat pipe pre-extrusion narrow weld spherical friction stir welding perfusion packaging process of claim 6, characterized in that,
in the step 4), the process parameters such as the rotating speed, the feeding speed, the pressing amount and the like of the spherical stirring friction head (305) are adjusted according to the geometric dimension of the micro heat pipe unit and the required forming effect.
8. The micro-channel aluminum heat pipe pre-extrusion narrow weld spherical friction stir welding perfusion packaging process of claim 7,
the width of the welding seam on the sealing line (202) can be adjusted according to production requirements, and the minimum width of the welding seam can be controlled to be about 5 mm.
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| CN112207418B (en) | 2021-12-28 |
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