CN116497205A - Membrane wall welded joint intermediate frequency induction heating post-heat treatment device and heat treatment method - Google Patents
Membrane wall welded joint intermediate frequency induction heating post-heat treatment device and heat treatment method Download PDFInfo
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- CN116497205A CN116497205A CN202310173213.3A CN202310173213A CN116497205A CN 116497205 A CN116497205 A CN 116497205A CN 202310173213 A CN202310173213 A CN 202310173213A CN 116497205 A CN116497205 A CN 116497205A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 171
- 230000006698 induction Effects 0.000 title claims abstract description 98
- 239000012528 membrane Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003466 welding Methods 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims description 30
- 229910000679 solder Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 230000002411 adverse Effects 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 description 9
- 238000004321 preservation Methods 0.000 description 8
- 229920000742 Cotton Polymers 0.000 description 6
- 238000009413 insulation Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a film wall welding joint intermediate frequency induction heating post-heat treatment device, which comprises a pipe and fins, wherein fin welding seams are arranged between adjacent fins, the pipe is provided with a welding joint, the heat treatment device comprises a temperature control thermocouple, two induction coils and an intermediate frequency induction heat treatment machine, wherein the two induction coils are respectively arranged on two sides of the film wall, and the induction coils are connected with the intermediate frequency induction heat treatment machine; uniform Wen Kuandu W of heated regions of the membrane wall E The wall thickness of the membrane wall tube was 6 times to 2 times the outer diameter of the membrane wall tube on each side of the welded joint. The heat treatment device provided by the invention can obtain a reasonable temperature equalizing range, overcomes the phenomena of large residual stress and large deformation caused by large heating area and large film wall heated expansion and large shrinkage during cooling, also overcomes the problems of small temperature equalizing range, low heat treatment efficiency and poor residual stress eliminating effect in the heating area, and solves the adverse effect of the traditional post-welding heat treatment process on joint performance.
Description
Technical Field
The invention belongs to the technical field of welding heat treatment, and particularly relates to a film type wall welding joint intermediate frequency induction heating local postweld heat treatment device and a postweld heat treatment method adopting the heat treatment device, which can be applied to the power station boiler water wall pipe heating surface welding joint intermediate frequency induction heating local postweld heat treatment.
Background
Post-weld heat treatment is a heat treatment that is performed to eliminate residual stress of the welded joint, improve the structure and performance of the welded joint. When the medium frequency induction heating is adopted, the general process flow is as follows: installing a thermocouple, wrapping heat preservation cotton, arranging and connecting heating coils, setting heat treatment parameters and carrying out heat treatment.
The heating surface of the water-cooled wall of the power station boiler adopts a membrane wall structure. The membrane wall is formed by welding a small-diameter pipe and fins, and has small rigidity and easy deformation. When the membrane wall is made up of small panels, the large panels are typically assembled, welded and partially post-welded at the worksite. Due to the structural features of the membrane wall, its post-weld heat treatment temperature field approximates a two-dimensional temperature field. When the film type wall structure is smaller in the post-welding heat treatment heating area, the heat treatment efficiency is low, the heat treatment area is small in the uniform temperature area due to the heat transfer characteristic of the two-dimensional temperature field, and the welding residual stress eliminating effect is poor; when the heating area of the film wall structure after welding heat treatment is larger, the expansion amount of the heating area is large, and because the heating area is restrained by the non-heated area around the two-dimensional temperature field, the film wall is large in deformation after welding heat treatment, the effect of eliminating welding residual stress is poor, and the quality of the film wall and the service life are seriously influenced.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the invention aims to provide a film type wall welding joint intermediate frequency induction heating post-heat treatment device, which is characterized in that a reasonable temperature equalizing area is obtained through the arrangement of induction heating coils, so that the welding residual stress is effectively reduced, and the deformation of a heated area is controlled.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the film wall comprises a pipe and fins, fin welding seams are arranged between adjacent fins, the pipe is provided with a welding joint, the heat treatment device comprises a temperature control thermocouple, an intermediate frequency induction heat treatment machine and two induction coils respectively arranged at two sides of the film wall, and the induction coils are connected with the intermediate frequency induction heat treatment machine; uniform Wen Kuandu W of heated regions of the membrane wall E 6 times film wall pipe wall thickness (wall thickness is generally 5-16 mm) to 2 times film wall pipe outer diameter (outer diameter is generally 32-76 mm) for each side of the welded joint; primary heating length L when the membrane wall fins of the heating zone are not welded E No more than 2000mm; once heating length L when the film wall fins of the heating region have been welded E No more than 10 butt joints of film wall tubing.
According to some preferred embodiments of the invention, the winding length L of the induction coil R ＝L E +2-4 turns; winding width W of the induction coil R ＝W E +2-4 turns, each turn is tightly attached, and a reasonable uniform temperature range is ensured.
According to some preferred embodiments of the invention, the length direction of the induction coil winding is perpendicular to the longitudinal direction (length extension direction) of the film wall tube. I.e. the length of the induction coil windings is parallel to the direction of alignment of the film wall pipe welds.
According to some preferred embodiments of the invention, the induction coils are wound to lie in the same plane and are armoured to the heating zone of the membrane wall.
According to some preferred embodiments of the invention, the armouring is a plastic plate that secures the induction coil to a non-heat conducting, non-eddy current generating under the influence of a magnetic field and resistant to high temperatures (200 ℃ and above).
According to some preferred embodiments of the invention, the temperature-controlled thermocouple is disposed on the pipe weld joint at a central location corresponding to the heating zone.
According to some preferred embodiments of the invention, a heat-insulating layer is arranged outside the membrane wall, the temperature-control thermocouple is arranged between the heat-insulating layer and the membrane wall, and the coil is arranged outside the heat-insulating layer.
According to some preferred embodiments of the invention, the coverage area of the heat-insulating layer is at least 300mm outside each side of the welding joint.
According to some preferred embodiments of the invention, the winding directions of the two induction coils are identical; the wound sizes of the two induction coils are consistent. The induction coil comprises a first induction coil and a second induction coil which are respectively arranged at two sides of the membrane wall, and the first induction coil and the second induction coil are wound in the same direction; and the length, the width and the winding turns of the first induction coil and the second induction coil are completely consistent.
The invention also providesA method of heat treating a film wall welded joint according to the intermediate frequency induction post-heat weld heat treatment apparatus described above, comprising the steps of: determining the postweld heat treatment of the membrane wall welded joint to be Wen Kuandu W E And a heating length L E The method comprises the steps of carrying out a first treatment on the surface of the And installing the heat treatment device, setting a heat treatment process curve, and performing postweld heat treatment.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages: the film wall welding joint intermediate frequency induction heating post-heat treatment device can obtain a reasonable temperature equalizing range, overcomes the phenomena of large residual stress and large deformation caused by large heating expansion and large shrinkage of the film wall when a heating area is large, also overcomes the problems of small temperature equalizing range, low heat treatment efficiency and poor residual stress eliminating effect when the heating area is small, solves the adverse effect of the traditional post-heat treatment process on joint performance, and meets the technical requirements of post-heat treatment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a device for heat treatment after intermediate frequency induction heating welding of a membrane wall welded joint in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic side view of a device for intermediate frequency induction heating post-weld heat treatment of a membrane wall weld joint in accordance with a preferred embodiment of the invention;
in the drawing, a film wall-1, a pipe-2, a fin-3, a welded joint-4, a temperature control thermocouple-5, an induction coil-6, a first induction coil-61, a second induction coil-62, an intermediate frequency induction heat treatment machine-7 and an insulating layer-8.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1 film wall welded Joint intermediate frequency Induction heating post-weld Heat treatment apparatus
As shown in fig. 1-2, the membrane wall 1 comprises tubes 2 and fins 3, with a fin 3 weld (not shown) between adjacent fins 3 (fins between two tubes 2), and the tubes 2 have a weld joint 4. The tube 2 is a small-diameter tube, the length direction of the tube 2 is provided with fins 3, and the fins 3 are welded and connected to form a heating surface. The small diameter pipe of the pipe 2 can be low alloy steel or novel heat-resistant steel with 9 percent Cr.
As shown in fig. 1-2, the film wall welding joint intermediate frequency induction post-heat welding heat treatment device in the embodiment comprises a temperature control thermocouple 5, two induction coils 6 and an intermediate frequency induction heat treatment machine 7 which are respectively arranged at two sides of the film wall 1, and a heat preservation layer 8 wrapping the film wall 1, wherein the induction coils 6 are connected with the intermediate frequency induction heat treatment machine 7. The coverage area of the heat preservation layer 8 is that each side of the upper, lower, left and right extension of the induction coil is not lower than 300mm. The temperature control thermocouple 5 is positioned between the heat insulation layer 8 and the membrane wall 1, and the coil is positioned outside the heat insulation layer 8. A temperature control thermocouple 5 is provided on the welded joint 4 of the pipe 2 at a central position corresponding to the heating region.
Both Wen Kuandu W of the heating zone of the membrane wall 1 E The joint 4 (up and down) was welded to each side of the tube 2 with 6 times the wall thickness of the membrane wall 1 tube to 2 times the outside diameter of the membrane wall 1 tube.
Primary heating length L when film wall 1 fin 3 of the heating zone is not welded E No more than 2000mm; once heating length L when film wall 1 fin 3 of the heating zone has been welded E No more than 10 membrane wall 1 pipe butt joints.
Length L of winding of induction coil 6 R ＝L E +2-4 turns; winding width W of induction coil 6 R ＝W E +2-4 turns, each turn is closely arranged, and no gap exists.
The length of the windings of the induction coil 6 is perpendicular to the longitudinal direction of the tube 2 in the membrane wall 1. I.e. the length of the windings of the induction coil 6 is parallel to the direction of alignment of the welded joints 4 of the tubes 2 on the membrane wall 1. The induction coils 6 are wound on the same plane and armoured to the heating zone of the membrane wall 1. The armor is to fix the induction coil 6 on a plastic plate which is not heat-conductive, does not generate vortex under the action of a magnetic field and is resistant to high temperature.
The winding directions of the two induction coils 6 are consistent; the length, width and number of turns of the two induction coils 6 after winding are identical. The induction coil 6 includes a first induction coil 61 and a second induction coil 62 respectively provided at both sides of the film wall 1, the first induction coil 61 and the second induction coil 62 being wound in the same direction; and the first induction coil 61 and the second induction coil 62 are completely identical in size.
Example 2 film wall 1 weld joint 4 intermediate frequency induction post heat treatment method
The present embodiment provides a method for performing heat treatment by using a heat treatment device after intermediate frequency induction heating welding of a welded joint 4 of a film wall 1 according to embodiment 1, comprising the following steps: determination of the postweld Heat treatment of the welded Joint 4 of the Membrane wall 1 Uniform Wen Kuandu W E And a heating length L E The method comprises the steps of carrying out a first treatment on the surface of the And (5) installing a heat treatment device, setting a heat treatment process curve, and performing postweld heat treatment.
The method specifically comprises the following steps:
(1) Determination of the postweld Heat treatment of the welded Joint 4 of the Membrane wall 1 Uniform Wen Kuandu W E And a heating length L E
Determining Wen Kuandu W of each postweld heat treatment of the film wall 1 pipe welding joint 4 according to the pipe size of the film wall 1 and the welding state of the fins 3 and combining related standard or technical requirements E And a heating length L E 。
(2) Thermocouple installation
And the thermocouple is fixed in a spot welding mode at the center position of the heating range, and the thermocouple is positioned on the butt joint welding seam of the film wall 1 pipe.
(3) Thermal insulation cotton
And covering heat preservation cotton in the winding area of the heating coil and the outer side of the winding area by at least 300mm to form a heat preservation layer 8.
(4) Winding induction coil 6
According to average Wen Kuandu W E And a heating length L E It is required to wind the induction coil 6. Length L of winding of induction coil 6 R ＝L E +2-4 turns, winding width W R ＝W E +2-4 turns, each turn is tightly attached without gaps. That is, the heat-retaining region covers the heating region of the coil, and the heating region covers the uniform temperature (width) region.
The induction coil 6 includes a first induction coil 61 and a second induction coil 62 which are respectively provided at both sides of the film wall 1, the first induction coil 61 and the second induction coil 62 are planar, and are wound in the same direction and have the same length, width and number of turns.
(5) Armouring the wound induction coil 6
The coil is fixed on a plastic plate which does not generate eddy current under the action of a non-heat-conducting magnetic field and is resistant to high temperature, and then is fixed on the membrane wall.
(6) The coil is connected to an intermediate frequency induction heat processor 7.
(7) Setting a heat treatment process curve, and performing postweld heat treatment.
Description of the preferred embodiments
A certain boiler water-cooling wall adopts a membrane wall 1 structure, the pipe material is 12Cr1MoVG, the outer diameter is 44.5mm, and the wall thickness is 9.0mm. The fin 3 is made of P22, and has a width of 12mm and a wall thickness of 6mm. The welding process in the installation engineering requires the adoption of an intermediate frequency induction heating method to carry out local postweld heat treatment on the welded joint 4 of the film wall 1 pipe. The constant temperature of the postweld heat treatment is 720 ℃, the constant temperature time is 60min, the temperature rising speed is 300 ℃/h, the heating width of each side of the welding joint 4 is not less than 60mm, and the coverage of the heat preservation cotton is not less than 300mm on each side of the welding joint 4.
The welded joint 4 was subjected to a partial post-weld heat treatment by the heat treatment method of example 2, and the specific implementation steps were as follows:
(1) Determining the winding width of the induction coil 6
According to the requirements of the postweld heat treatment process, the heating width is not less than 60mm on each side of the welded joint 4. The coil winding width was determined to be 90mm on each side of the weld joint in consideration of the heating power and the heating coil size.
(2) Determining the winding length of the induction coil 6
Since the fin 3 welds have not yet been welded, the number of heat treated joints per oven can be increased appropriately. According to the length of each induction coil 6, the winding length of each furnace is set to be not more than 2000mm, and the number of joints in the length range of 2000mm of the water-cooled wall is 11. The winding length of the induction coil 6 is an additional 4 turns covering the 11 solder joints 4.
(3) Arranging thermocouples
1 thermocouple was mounted on the middle joint weld of the 11 joints. And a plurality of temperature thermocouples are arranged in other areas. The thermocouple is fixed by spot welding, and the direction is consistent with the length direction of the pipe 2.
(4) Coated heat-insulating cotton
The two sides of the welding line in the heat preservation range are 400mm respectively. The two sides use the same specification of heat preservation cotton, and simultaneously the two sides of the welding line are equal in covering length.
(5) Winding heating coil
And winding the coil according to the determined winding width and length of the coil, namely controlling the whole length and width of the coil, and adopting a high-temperature-resistant plastic plate to fix the heating coil in an armored manner after finishing.
(6) Connect thermocouple and heating coil
The thermocouple and heating coil were connected to an intermediate frequency induction heater.
(7) Setting post-welding heat treatment process parameters
And setting the post-welding heat treatment process parameters according to the welding heat treatment process requirements.
(8) And (5) starting up to perform postweld heat treatment.
Post-weld heat treatment inspection shows that no significant deformation is found in the heated region and the temperature in the uniform temperature region is uniform. The method obtains a required temperature field and meets the quality requirement of post-welding heat treatment of the welded joint 4 of the membrane wall 1.
In the present invention, the given post-weld heat treatment process and the required heating range are known and determined for a particular membrane wall structure. The power required to heat a membrane wall pipe joint according to a given post-weld heat treatment process and the required heating range is common knowledge in the art and will not be described in detail herein.
Due to the structural features of the membrane wall, its post-weld heat treatment temperature field approximates a two-dimensional temperature field. When the post-welding heat treatment heating area is smaller, the heat treatment efficiency is low, the heat treatment area is small in temperature equalizing area due to the heat transfer characteristic of the two-dimensional temperature field, and the welding residual stress eliminating effect is poor; when the heating area of the postweld heat treatment is larger, the expansion amount of the heating area is large, and because the heating area is restrained by the non-heated area around the two-dimensional temperature field, the deformation of the membrane wall after the postweld heat treatment is large, the effect of eliminating the welding residual stress is poor, and the quality and the service life of the membrane wall are seriously influenced.
The invention provides an induction coil winding mode and winding size aiming at the characteristics of a film wall intermediate frequency induction post-heat treatment temperature field, and designs the film wall intermediate frequency induction post-heat treatment temperature field into an armoured mode so as to adapt to the structural requirement of the film wall. The device and the method effectively avoid the adverse effect caused by the too small or too large temperature equalizing range, successfully overcome the adverse effect of the traditional post-welding heat treatment process on the joint performance, and meet the technical requirements of post-welding heat treatment of the joint. The film wall welding joint intermediate frequency induction heating local postweld heat treatment device and method determine a proper heating range, and a reasonable uniform temperature range is obtained through arrangement of induction heating coils, so that welding residual stress is effectively reduced, and deformation of a heated area is controlled.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (10)
1. A film wall welding joint intermediate frequency induction heating post-heat treatment device comprises a tube and fins, wherein fins are arranged between adjacent finsThe welding seam is provided with a welding joint on the pipe, and is characterized in that the heat treatment device comprises a temperature control thermocouple, an intermediate frequency induction heat treatment machine and two induction coils respectively arranged at two sides of the membrane wall, and the induction coils are connected with the intermediate frequency induction heat treatment machine; uniform Wen Kuandu W of heated regions of the membrane wall E The wall thickness of the membrane type wall pipe is 6 times of each side of the welding joint to 2 times of the outer diameter of the membrane type wall pipe; primary heating length L when the membrane wall fins of the heating zone are not welded E No more than 2000mm; once heating length L when the film wall fins of the heating region have been welded E No more than 10 welded joints of film wall tubing.
2. The heat treatment apparatus according to claim 1, wherein a winding length L of the induction coil R ＝L E +2-4 turns; winding width W of the induction coil R ＝W E +2-4 turns; adjacent turns of the induction coil are bonded.
3. The heat treatment device of claim 1, wherein the length of the induction coil wrap is perpendicular to the longitudinal direction of the film wall tube.
4. A heat treatment device according to claim 1, wherein the induction coil is wound to lie in the same plane and is armoured to the heated region of the membrane wall.
5. The heat treatment apparatus according to claim 4, wherein the sheath is a plastic plate which is thermally non-conductive, does not generate eddy currents under the action of a magnetic field, and is resistant to high temperatures.
6. The heat treatment apparatus according to claim 5, wherein the temperature control thermocouple is provided at a central position of the heating region and at a welded joint of the film wall pipe.
7. The heat treatment device of claim 1, wherein an insulating layer is disposed outside the membrane wall, the temperature control thermocouple is disposed between the insulating layer and the membrane wall, and the coil is disposed outside the insulating layer.
8. The heat treatment apparatus of claim 7, wherein the thermal layer covers at least 300mm outward from each side of the solder joint.
9. The heat treatment apparatus according to claim 1, wherein winding directions of the two induction coils are identical; the wound sizes of the two induction coils are consistent.
10. A method of heat treating a film wall welded joint intermediate frequency induction post heat weld heat treatment apparatus according to any one of claims 1 to 9, comprising the steps of:
determining the postweld heat treatment of the membrane wall welded joint to be Wen Kuandu W E And a heating length L E The method comprises the steps of carrying out a first treatment on the surface of the And installing the heat treatment device, setting a heat treatment process curve, and performing postweld heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310173213.3A CN116497205A (en) | 2023-02-27 | 2023-02-27 | Membrane wall welded joint intermediate frequency induction heating post-heat treatment device and heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310173213.3A CN116497205A (en) | 2023-02-27 | 2023-02-27 | Membrane wall welded joint intermediate frequency induction heating post-heat treatment device and heat treatment method |
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| Publication Number | Publication Date |
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| CN116497205A true CN116497205A (en) | 2023-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310173213.3A Pending CN116497205A (en) | 2023-02-27 | 2023-02-27 | Membrane wall welded joint intermediate frequency induction heating post-heat treatment device and heat treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116497205A (en) |
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2023
- 2023-02-27 CN CN202310173213.3A patent/CN116497205A/en active Pending
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