CN108637588B - Repairing method for spiral blade of expansion dryer - Google Patents
Repairing method for spiral blade of expansion dryer Download PDFInfo
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- CN108637588B CN108637588B CN201810662152.6A CN201810662152A CN108637588B CN 108637588 B CN108637588 B CN 108637588B CN 201810662152 A CN201810662152 A CN 201810662152A CN 108637588 B CN108637588 B CN 108637588B
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- spiral blade
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
Abstract
The invention belongs to the field of spiral blade repair special for post-processing in the rubber industry, and relates to a repair method for a spiral blade of an expansion dryer. Firstly, removing a fatigue layer of a worn part on the matching surface of a damaged helical blade, then selecting an iron-based alloy welding wire with mechanical property with a base material, simultaneously performing additive quenching by adopting a composite process of cold metal transition and laser cladding, removing residual stress in a part after cladding by a pneumatic vibration rod method, and finally restoring the part to a designed size by a precision machining method, thereby restoring the use performance of the helical blade. The method carries out additive repair on the spiral blade of the expansion dryer, the base material is always kept at a lower temperature in the additive process, and the deformation of parts is almost zero; the obtained additive layer is metallurgically combined with the matrix, and has high automation efficiency and lower cost.
Description
Technical Field
The invention belongs to the field of spiral blade repair special for post-processing in the rubber industry, and relates to a repair method for a spiral blade of an expansion dryer.
Background
The butadiene rubber is a main product produced by synthetic rubber in China at present and is mainly used for manufacturing tires. After the production of the butadiene rubber, a dryer is needed for drying, and the dryer realizes the drying of the residual moisture in the butadiene rubber under the action of steam in an extrusion mode. The expansion dryer is indispensable aftertreatment equipment in the butadiene rubber industry, and helical blade is the most fragile part wherein again, guarantees that the unit of operation does not shut down in an overhaul period, needs to guarantee that helical blade has good wearability and corrosion resistance. The material of helical blade is stainless steel, and the surface is not wear-resisting, and the tradition mode is the electric welding department taili alloy, and the electric welding heat input is bigger, needs the transition layer, and the build-up welding layer is cracked easily, and helical blade's blade body and hole also can produce the deformation, lose prosthetic meaning.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for repairing the spiral blade of the expansion dryer, which aims at repairing the matching surface of the spiral blade in the long-term operation process.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a repairing method of an expansion dryer helical blade comprises the following steps:
(1) determining a repair scheme according to the damage degree of the spiral blade of the expansion dryer;
(2) removing the fatigue layer on the matching surface of the worn spiral blade;
(3) performing material increase quenching repair on the spiral sleeve blade by adopting a cold metal transition process and a laser quenching composite process;
(4) removing stress of the surfacing layer;
(5) and (6) finishing.
In the repairing method of the spiral blade of the expansion dryer, in the step (1), the spiral blade is disassembled from the main shaft, and after the spiral blade is cleaned by adopting a cleaning agent, the size precision of cracks, surface defects and related inner holes is checked to determine a repairing scheme.
In the repairing method of the spiral blade of the expansion dryer, in the step (2), the spiral blade is installed on a lathe, and the worn outer diameter matching surface is lathed away to expose fresh metal.
In the repairing method of the spiral blade of the expansion dryer, in the step (3), the cold metal transition process parameters are as follows: the welding current is 180-220A, the welding voltage is 22-26V, the distance between a welding wire and a workpiece is 2-3 mm, the diameter of the welding wire is 1.6-2.4 mm, argon protection is adopted, the flow of protective gas is 15-25L/min, the wire feeding speed is 5.0-8.0 r/min, the welding scanning speed is 10-18 mm/s, and the lap joint rate between lanes is 50% -70%; meanwhile, the technological parameters of laser quenching are as follows: the laser power is 2000-2500W, argon protection is adopted, the flow of protective gas argon is 15-25L/min, the laser scanning speed is 15-20 mm/s, and the lap joint rate between the lanes is 10% -20%.
In the repairing method of the spiral blade of the expansion dryer, in the step (4), stress removal is carried out on the cladding layer by adopting a vibration method, the stress is removed once every cladding layer is formed, and the vibration time is 4-6 min.
In the repairing method of the spiral blade of the expansion dryer, in the step (5), a lathe is adopted to carry out final finish machining on the repaired part so as to meet the requirements of the size and the precision of the spiral blade.
According to the repairing method of the spiral blade of the expansion dryer, the chemical composition range of the spiral blade is as follows: 0.01-0.03% of C, 1.5-2.5% of Mn1.00-19.00% of Cr17.00-12.00% of Ni9.00-12.00% of Ti, and the balance of Fe.
According to the repairing method of the spiral blade of the expansion dryer, the chemical component range of the welding wire corresponding to the spiral blade is as follows: 0.01-0.03% of C, 1.5-2.5% of Mn1.00-19.00% of Cr17.00-12.00% of Ni9.00-12.00% of Ti, and the balance of Fe.
The design idea of the invention is as follows:
the invention provides a repairing method of a spiral blade of an expansion dryer, aiming at parts with abrasion and cracks of the spiral blade in the long-term operation process. The invention adopts a cold metal transition process and a laser quenching composite process to perform additive repair on the spiral blade of the expansion dryer, and the deformation of parts is almost zero; the obtained additive layer is metallurgically combined with the matrix, and has high automation efficiency and lower cost. The composite process of cold metal transition and laser quenching is carried out synchronously, the base material is always kept at a lower temperature in the material increase process, laser begins to quench along with the overlaying welding of the cold metal transition, and the transition of a transition layer is omitted. It is known that heat is accumulated in any welding process, technological parameters of cold metal transition are smaller than those of normal surfacing, and heat of a workpiece is smaller than that of other conventional welding methods, so that the workpiece is almost close to a cold state, and the working efficiency is greatly improved by direct laser quenching. The material similar to the substrate is selected as the surfacing material, the metallurgical bonding and the similar expansion coefficient are further increased, and the cracking phenomenon is avoided.
The invention has the following beneficial effects:
1. the key point of the repair method of the spiral blade of the expansion dryer is that a composite process of cold metal transition surfacing and laser quenching is adopted, electric surfacing stellite materials are not needed, only cold metal transition surfacing common alloy materials are adopted, and meanwhile, a laser quenching method is adopted, so that the surface of a surfacing layer is hardened, the phenomenon of cracking of electric welding stellite alloy is avoided, and the repair of the spiral blade can be quickly realized.
2. The repair method for the spiral blade of the expansion dryer provided by the invention has the advantages of simple process, easiness in operation, high maintenance efficiency and production cost saving.
3. The process has small heat affected zone, and can realize simultaneous surfacing and quenching at higher speed.
4. The process of the invention only uses one welding material, and can obtain the overlaying layer with higher hardness than the base material without a transition layer.
Detailed Description
In the specific implementation process, firstly, a fatigue layer of a worn part on the matching surface of a damaged helical blade is removed, then an iron-based alloy welding wire with mechanical property with a base material is selected, the composite process of cold metal transition and laser cladding is adopted for additive quenching, the residual stress in the part after cladding is removed by a pneumatic vibration rod method, and finally the part is recovered to the design size by a precision machining method, so that the use performance of the helical blade is recovered.
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1
In this embodiment, the chemical components of the spiral blade of the expansion dryer are as follows: c0.02, Mn2.0, Cr18.00, Ni10.00, Ti0.15 and the balance of Fe, and the repairing method comprises the following steps:
(1) determining a repair scheme according to the damage degree of the spiral blade of the expansion dryer;
(2) removing the fatigue layer on the matching surface of the worn spiral blade;
(3) performing additive quenching by a composite process;
(4) removing stress of the surfacing layer;
(5) and (6) finishing.
In the step (1), the helical blade is disassembled from the main shaft, and after the helical blade is cleaned by adopting a cleaning agent, the size precision of cracks, surface defects and related inner holes is checked to determine a repair scheme.
In step (2), the helical blade is mounted on a lathe, the worn outer diameter matching surface is machined off to expose fresh metal, and then surface dye inspection is carried out until no defect exists.
In the step (3), the helical sleeve blade is repaired by adopting a cold metal transition process and a laser quenching composite process, wherein the cold metal transition process parameters are as follows: the welding current is 200A, the welding voltage is 22V, the distance between a welding wire and a workpiece is 2mm, the diameter of the welding wire is 1.6mm, argon protection is adopted, the flow of protective gas is 15L/min, the wire feeding speed is 5.0r/min, the welding scanning speed is 10mm/s, and the lap joint rate between lanes is 50%. Meanwhile, the technological parameters of laser quenching are as follows: the laser power is 2000W, argon protection is adopted, the flow of protective gas argon is 15L/min, the laser scanning speed is 15mm/s, and the lap joint rate between the channels is 10%. The welding wire corresponding to the helical blade comprises the following chemical components: 0.02 percent of C, 2.5 percent of Mn2, 19.00 percent of Cr19, 11.00 percent of Ni11, 0.20 percent of Ti0 and the balance of Fe.
In the step (4), stress removal is carried out on the cladding layer by adopting a vibration method, the stress is removed once every cladding layer, and the vibration time is 4 min.
In the step (5), a lathe is adopted to carry out final finish machining on the repaired part so as to meet the requirements of the size and the precision of the spiral blade.
In the embodiment, the composite process is adopted, the repair of the helical blade is rapidly realized, the base material is always kept at a lower temperature in the surfacing and quenching processes, and the deformation of parts is almost zero; the obtained surfacing layer is metallurgically bonded with the substrate, the strength is high, a hardening layer with the thickness of 0.5mm is arranged on the surface, the automation efficiency is high, and the cost is lower.
Example 2
In this embodiment, the chemical components of the spiral blade of the expansion dryer are as follows: c0.01, Mn1.5, Cr17.00, Ni9.00, Ti0.1, and the balance of Fe, and the repairing method comprises the following steps:
(1) determining a repair scheme according to the damage degree of the spiral blade of the expansion dryer;
(2) removing the fatigue layer on the matching surface of the worn spiral blade;
(3) performing additive quenching by a composite process;
(4) removing stress of the surfacing layer;
(5) and (6) finishing.
In the step (1), the helical blade is disassembled from the main shaft, and after the helical blade is cleaned by adopting a cleaning agent, the size precision of cracks, surface defects and related inner holes is checked to determine a repair scheme.
In step (2), the helical blade is mounted on a lathe, the worn outer diameter matching surface is machined off to expose fresh metal, and then surface dye inspection is carried out until no defect exists.
In the step (3), the helical sleeve blade is repaired by adopting a cold metal transition process and a laser quenching composite process, wherein the cold metal transition process parameters are as follows: the welding current is 190A, the welding voltage is 23V, the distance between a welding wire and a workpiece is 2.5mm, the diameter of the welding wire is 1.8mm, argon protection is adopted, the flow of protective gas is 20L/min, the wire feeding speed is 6.0r/min, the welding scanning speed is 12mm/s, and the lap joint rate between lanes is 60%. Meanwhile, the technological parameters of laser quenching are as follows: the laser power is 2200W, argon protection is adopted, the flow of protective gas argon is 20L/min, the laser scanning speed is 20mm/s, and the lap joint rate between the channels is 15%. The welding wire corresponding to the helical blade comprises the following chemical components: 0.01 percent of C, 1.8 percent of Mn1, 17.50 percent of Cr17, 9.60 percent of Ni0.15 percent of Ti0, and the balance of Fe.
In the step (4), stress removal is carried out on the cladding layer by adopting a vibration method, the stress is removed once every cladding layer, and the vibration time is 4 min.
In the step (5), a lathe is adopted to carry out final finish machining on the repaired part so as to meet the requirements of the size and the precision of the spiral blade.
In the embodiment, the composite process is adopted, the repair of the helical blade is rapidly realized, the base material is always kept at a lower temperature in the surfacing and quenching processes, and the deformation of parts is almost zero; the obtained surfacing layer is metallurgically bonded with the substrate, the strength is high, a hardening layer with the thickness of 0.5mm is arranged on the surface, the automation efficiency is high, and the cost is lower.
Example 3
In this embodiment, the chemical components of the spiral blade of the expansion dryer are as follows: c0.03, Mn2.2, Cr18.50, Ni11.70, Ti0.23 and the balance of Fe, and the repairing method comprises the following steps:
(1) determining a repair scheme according to the damage degree of the spiral blade of the expansion dryer;
(2) removing the fatigue layer on the matching surface of the worn spiral blade;
(3) performing additive quenching by a composite process;
(4) removing stress of the surfacing layer;
(5) and (6) finishing.
In the step (1), the helical blade is disassembled from the main shaft, and after the helical blade is cleaned by adopting a cleaning agent, the size precision of cracks, surface defects and related inner holes is checked to determine a repair scheme.
In step (2), the helical blade is mounted on a lathe, the worn outer diameter matching surface is machined off to expose fresh metal, and then surface dye inspection is carried out until no defect exists.
In the step (3), the helical sleeve blade is repaired by adopting a cold metal transition process and a laser quenching composite process, wherein the cold metal transition process parameters are as follows: the welding current is 210A, the welding voltage is 26V, the distance between a welding wire and a workpiece is 3mm, the diameter of the welding wire is 2.0mm, argon protection is adopted, the flow of protective gas is 25L/min, the wire feeding speed is 7.0r/min, the welding scanning speed is 15mm/s, and the lap joint rate between lanes is 70%. Meanwhile, the technological parameters of laser quenching are as follows: the laser power is 2400W, argon protection is adopted, the flow of protective gas argon is 25L/min, the laser scanning speed is 25mm/s, and the lap joint rate between the channels is 20%. The welding wire corresponding to the helical blade comprises the following chemical components: 0.03 percent of C, 2.4 percent of Mn2, 18.70 percent of CrC, 12.00 percent of Ni0.25 percent of Ti0, and the balance of Fe.
In the step (4), stress removal is carried out on the cladding layer by adopting a vibration method, the stress is removed once every cladding layer, and the vibration time is 4 min.
In the step (5), a lathe is adopted to carry out final finish machining on the repaired part so as to meet the requirements of the size and the precision of the spiral blade.
In the embodiment, the composite process is adopted, the repair of the helical blade is rapidly realized, the base material is always kept at a lower temperature in the surfacing and quenching processes, and the deformation of parts is almost zero; the obtained surfacing layer is metallurgically bonded with the substrate, the strength is high, a hardening layer with the thickness of 0.5mm is arranged on the surface, the automation efficiency is high, and the cost is lower.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention is described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or some technical features of the present invention may be substituted. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The repairing method of the spiral blade of the expansion dryer is characterized in that the spiral blade of the expansion dryer comprises the following chemical components: c0.02, Mn2.0, Cr18.00, Ni10.00, Ti0.15 and the balance of Fe, and the repairing method comprises the following steps:
(1) determining a repair scheme according to the damage degree of the spiral blade of the expansion dryer;
(2) removing the fatigue layer on the matching surface of the worn spiral blade;
(3) performing additive quenching by a composite process;
(4) removing stress of the cladding layer;
(5) fine processing;
in the step (1), the helical blade is disassembled from the main shaft, and after being cleaned by adopting a cleaning agent, the size precision of cracks, surface defects and related inner holes is checked to determine a repair scheme;
in the step (2), the helical blade is arranged on a lathe, the worn outer diameter matching surface is lathed off to expose fresh metal, and then surface dye check is carried out until no defect exists;
in the step (3), the helical blade is repaired by adopting a cold metal transition process and a laser quenching composite process, wherein the cold metal transition process parameters are as follows: the welding current is 200A, the welding voltage is 22V, the distance between a welding wire and a workpiece is 2mm, the diameter of the welding wire is 1.6mm, argon protection is adopted, the flow of protective gas is 15L/min, the wire feeding speed is 5.0r/min, the welding scanning speed is 10mm/s, and the lap joint rate between lanes is 50%; meanwhile, the technological parameters of laser quenching are as follows: the laser power is 2000W, argon protection is adopted, the flow of protective gas argon is 15L/min, the laser scanning speed is 15mm/s, and the lap joint rate between the channels is 10%; the welding wire corresponding to the helical blade comprises the following chemical components: 0.02 percent of C, 2.5 percent of Mn2, 19.00 percent of Cr19, 11.00 percent of Ni11, 0.20 percent of Ti0, and the balance of Fe;
in the step (4), stress removal is carried out on the cladding layer by adopting a vibration method, the stress is removed once every cladding layer, and the vibration time is 4 min;
in the step (5), a lathe is adopted to carry out final finish machining on the repaired part so as to meet the requirements of the size and the precision of the spiral blade.
2. The repairing method of the spiral blade of the expansion dryer is characterized in that the spiral blade of the expansion dryer comprises the following chemical components: c0.01, Mn1.5, Cr17.00, Ni9.00, Ti0.1, and the balance of Fe, and the repairing method comprises the following steps:
(1) determining a repair scheme according to the damage degree of the spiral blade of the expansion dryer;
(2) removing the fatigue layer on the matching surface of the worn spiral blade;
(3) performing additive quenching by a composite process;
(4) removing stress of the cladding layer;
(5) fine processing;
in the step (1), the helical blade is disassembled from the main shaft, and after being cleaned by adopting a cleaning agent, the size precision of cracks, surface defects and related inner holes is checked to determine a repair scheme;
in the step (2), the helical blade is arranged on a lathe, the worn outer diameter matching surface is lathed off to expose fresh metal, and then surface dye check is carried out until no defect exists;
in the step (3), the helical blade is repaired by adopting a cold metal transition process and a laser quenching composite process, wherein the cold metal transition process parameters are as follows: the welding current is 190A, the welding voltage is 23V, the distance between a welding wire and a workpiece is 2.5mm, the diameter of the welding wire is 1.8mm, argon protection is adopted, the flow of protective gas is 20L/min, the wire feeding speed is 6.0r/min, the welding scanning speed is 12mm/s, and the lap joint rate between lanes is 60%; meanwhile, the technological parameters of laser quenching are as follows: the laser power is 2200W, argon protection is adopted, the flow of protective gas argon is 20L/min, the laser scanning speed is 20mm/s, and the lap joint rate between the channels is 15%; the welding wire corresponding to the helical blade comprises the following chemical components: 0.01 percent of C, 1.8 percent of Mn1, 17.50 percent of Cr17, 9.60 percent of Ni0.15 percent of Ti0, and the balance of Fe;
in the step (4), stress removal is carried out on the cladding layer by adopting a vibration method, the stress is removed once every cladding layer, and the vibration time is 4 min;
in the step (5), a lathe is adopted to carry out final finish machining on the repaired part so as to meet the requirements of the size and the precision of the spiral blade.
3. The repairing method of the spiral blade of the expansion dryer is characterized in that the spiral blade of the expansion dryer comprises the following chemical components: c0.03, Mn2.2, Cr18.50, Ni11.70, Ti0.23 and the balance of Fe, and the repairing method comprises the following steps:
(1) determining a repair scheme according to the damage degree of the spiral blade of the expansion dryer;
(2) removing the fatigue layer on the matching surface of the worn spiral blade;
(3) performing additive quenching by a composite process;
(4) removing stress of the cladding layer;
(5) fine processing;
in the step (1), the helical blade is disassembled from the main shaft, and after being cleaned by adopting a cleaning agent, the size precision of cracks, surface defects and related inner holes is checked to determine a repair scheme;
in the step (2), the helical blade is arranged on a lathe, the worn outer diameter matching surface is lathed off to expose fresh metal, and then surface dye check is carried out until no defect exists;
in the step (3), the helical blade is repaired by adopting a cold metal transition process and a laser quenching composite process, wherein the cold metal transition process parameters are as follows: the welding current is 210A, the welding voltage is 26V, the distance between a welding wire and a workpiece is 3mm, the diameter of the welding wire is 2.0mm, argon protection is adopted, the flow of protective gas is 25L/min, the wire feeding speed is 7.0r/min, the welding scanning speed is 15mm/s, and the lap joint rate between lanes is 70%; meanwhile, the technological parameters of laser quenching are as follows: the laser power is 2400W, argon protection is adopted, the flow of protective gas argon is 25L/min, the laser scanning speed is 25mm/s, and the lap joint rate between the channels is 20%; the welding wire corresponding to the helical blade comprises the following chemical components: 0.03 percent of C, 2.4 percent of Mn2, 18.70 percent of CrC, 12.00 percent of Ni0.25 percent of Ti0, and the balance of Fe;
in the step (4), stress removal is carried out on the cladding layer by adopting a vibration method, the stress is removed once every cladding layer, and the vibration time is 4 min;
in the step (5), a lathe is adopted to carry out final finish machining on the repaired part so as to meet the requirements of the size and the precision of the spiral blade.
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| CN109570900A (en) * | 2018-11-23 | 2019-04-05 | 成都国营锦江机器厂 | The replacing options of straightener blade in engine |
| CN109590668A (en) * | 2019-01-07 | 2019-04-09 | 浙江翰德圣智能再制造技术有限公司 | A kind of steam turbine cylinder sealing surface renovation technique |
| CN110052610B (en) * | 2019-05-31 | 2020-05-19 | 燕山大学 | Additive manufacturing method of cast iron roller |
| CN110102878B (en) * | 2019-06-03 | 2020-04-28 | 燕山大学 | CMT and laser cladding composite repair method for inner hole of flat head sleeve of main shaft of rolling mill |
| CN110900105A (en) * | 2019-11-21 | 2020-03-24 | 浙江翰德圣智能再制造技术有限公司 | Method for repairing worn impeller of pulper |
| CN110883495A (en) * | 2019-11-21 | 2020-03-17 | 浙江翰德圣智能再制造技术有限公司 | Online repair process for rotary valve rotor sealing surface |
| CN114799420B (en) * | 2022-05-17 | 2024-03-19 | 泰尔(安徽)工业科技服务有限公司 | Repairing method of hot-rolled laminar cooling roller |
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| CN1796602A (en) * | 2004-12-24 | 2006-07-05 | 李贞� | Method for repairing large-scale roller |
| JP4546318B2 (en) * | 2005-04-15 | 2010-09-15 | 株式会社日立製作所 | Ni-based alloy member and manufacturing method thereof, turbine engine component, welding material and manufacturing method thereof |
| CN104762617A (en) * | 2013-06-29 | 2015-07-08 | 苏州唐氏机械制造有限公司 | Laser repairing method for die |
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Inventor after: Han Xu Inventor after: Chen Shu Inventor after: Zeng Zengwei Inventor before: Han Xu Inventor before: Xie Yujiang Inventor before: Chen Shu Inventor before: Zeng Zengwei |
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Denomination of invention: A repair method for spiral blade of expansion dryer Effective date of registration: 20220524 Granted publication date: 20210205 Pledgee: Zhejiang Pinghu Rural Commercial Bank branch Zhapu Limited by Share Ltd. Pledgor: ZHEJIANG HANDSOME INTELLIGENT REMANUFACTURING TECHNOLOGY CO.,LTD. Registration number: Y2022330000758 |