CN110923437A - Metal plate strip heat treatment spiral roller way - Google Patents
Metal plate strip heat treatment spiral roller way Download PDFInfo
- Publication number
- CN110923437A CN110923437A CN201911213760.XA CN201911213760A CN110923437A CN 110923437 A CN110923437 A CN 110923437A CN 201911213760 A CN201911213760 A CN 201911213760A CN 110923437 A CN110923437 A CN 110923437A
- Authority
- CN
- China
- Prior art keywords
- metal plate
- bearing
- spiral
- plate strip
- spiral roller
- 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.)
- Pending
Links
Images
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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/563—Rolls; Drums; Roll arrangements
-
- 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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
Abstract
The invention discloses a metal plate strip heat treatment spiral roller way which consists of a spiral roller body, a transmission bearing seat, a support bearing seat and a roller ring, is arranged at a high-pressure section and a part of low-pressure section of a roller quenching machine, and is used for rapid cooling (quenching and solution) heat treatment of metal plate strips such as plain carbon steel, low alloy steel, stainless steel, special alloy and the like with the thickness of 2-300 mm. The spiral roller way can quickly and directionally remove wall surface cooling residual water in the heat treatment and cooling process of the metal plate strip, avoids the generation of cooling soft spots and high temperature zones, and can realize the wide-direction flow partition control through the flow guide and flow equalization design, thereby improving the cooling efficiency and uniformity of the metal plate strip.
Description
Technical Field
The invention belongs to the technical field of metal plate strip heat treatment equipment, and relates to a metal plate strip heat treatment spiral roller way.
Background
The heat treatment of the metal plate strip relates to the technical processes of normalizing, quenching, tempering, controlled cooling, solid solution and the like, wherein the processes of quenching, controlled cooling, solid solution and the like need to heat the metal plate strip to a certain temperature (generally more than or equal to 800 ℃), and then the metal plate strip is cooled to the final cooling temperature of the process at a certain cooling speed by adopting a water cooling mode so as to achieve the purposes of improving the internal structure and structure of the metal and improving the performance.
The heat treatment of the metal plate and strip usually adopts a roller hearth type heat treatment furnace to complete the heating process, and adopts a roller type quenching machine to complete the quenching, controlled cooling and other processes. The roller type quenching machine has strong cooling capacity and uniform cooling, and the plate shape of the cooled plate strip is good, so that the roller type quenching machine can be used for the production of quenching, solid solution, controlled cooling and the like of metal plate strips such as carbon steel, stainless steel, special alloy, titanium alloy, aluminum alloy and the like, and is a main cooling equipment form of a large-scale heat treatment line. The roller type quenching machine adopts a jet impact quenching mode, high-pressure and large-flow cooling water impacts the upper surface and the lower surface of the plate strip at a high speed to pierce surface steam films, so that the direct single-phase forced convection heat exchange with the wall surface is realized, and the wall surface heat exchange efficiency is high and the heat exchange controllability is good.
In the process of cooling the metal plate strip, the cooling speed and the plate shape are main process indexes. For metal plate strips with ultra-thin specifications of less than 10mm, slit nozzles and a plurality of rows of circular hole inclined jet nozzles are adopted in the high-pressure section of the quenching machine, large-flow instantaneous high-cooling-speed jet cooling is implemented, phase change is thorough and quasi-transient in the cooling process, the cooling temperature drop and the uniformity of performance are improved, and the cooling stress is reduced; for an ultra-thick metal plate with the thickness of more than 100mm, the high-pressure section of the quenching machine is cooled by large temperature gradient, the temperature of the thick near surface of the plate and strip is rapidly reduced by high-pressure and large-flow cooling water to the range of 1/4 thickness, the heat transfer foundation is laid for heat conduction of the large temperature gradient of the core, the low-pressure section is cooled continuously and efficiently, the dynamic balance of wall surface heat exchange and internal heat conduction is realized, and the core cooling speed and the section cooling uniformity are continuously improved; for an ultra-wide plate and strip with the width of more than 3500mm, the flow in the width direction is controlled in a partition mode in the cooling process, the temperature drop/phase change in the middle and the edge in the width direction is guaranteed to be in quasi-synchronization, and the width-direction cooling uniformity of the plate and strip is improved. The implementation of the cooling process needs large flow rate in a high-pressure section of the quenching machine, high cooling speed cooling and high-efficiency continuous cooling in a low-pressure section, a large amount of residual cooling water after heat exchange needs to be discharged timely and orderly, the opportunity and the capacity of contact and heat exchange between new water and a high-temperature wall surface are improved, and meanwhile, the wide-direction flow partition control is realized.
Patent CN207483787U discloses a metal surface treatment spiral roller, which comprises a roller body and a spiral processing blade. The spiral roller is used for surface treatment of metal components, removing surface oxide skin and decarburized layers, realizing metal strengthening and surface wear resistance, and has nothing to do with the functions of drainage, steel plate conveying, shunt and the like of the metal plate strip heat treatment spiral roller way.
Patent CN202246754U discloses a roller screen internal spiral quenching machine, which comprises a spiral quenching roller, a reduction gearbox, a motor and a slideway. The lower half part of the quenching machine is immersed in a water tank and is used for quenching spherical or round bar-shaped metal workpieces, and the structure and the function of the quenching machine are greatly different from those of the metal plate strip roller type quenching spiral roller way.
Patent CN104099462A discloses a spiral water-cooled hearth roll, including roll body, the roller of connection at the roll body both ends. The roller way is used for a plate strip hot galvanizing heating furnace, and is characterized by uniform water cooling, good furnace roller cooling effect and larger difference in structure and function with the metal plate strip cooling roller way.
Disclosure of Invention
The invention aims to provide a metal plate strip heat treatment spiral roller way which is arranged at a high-pressure section and a partial low-pressure section of a roller type quenching machine, on one hand, wall surface cooling residual water in the heat treatment and cooling process of the metal plate strip can be quickly and directionally removed, and the generation of cooling soft spots and high-temperature zones is avoided; on the other hand, the flow guide and flow equalization design can realize the partition control of the width flow, meet the requirements of high cooling speed, high cooling uniformity and high flatness plate shape of the heat treatment water cooling of the metal plate strip, and improve the cooling efficiency and uniformity of the metal plate strip.
The metal plate strip heat treatment spiral roller way is arranged at a high-pressure section and a partial low-pressure section of a roller quenching machine; the spiral roller way comprises a spiral roller body, a transmission bearing seat, a support bearing seat and a roller ring; the spiral roller body is a driving roller provided with two sections of spiral grooves with opposite rotation directions, and a roller ring is arranged between the two sections of spiral grooves; drainage grooves are arranged on two sides of the spiral roller body; the two sides of the spiral roller body are respectively combined with a transmission bearing seat and a mechanical seal on a supporting bearing seat, so that cooling water is prevented from entering the bearing and the service life is shortened; the spiral groove is provided with six-end threads, the lead of the threads is 200-400 mm, the lead angle of the threads is 25-30 degrees, and no groove-shaped indentation is formed on the surface of the cooled metal plate strip; when the metal plate strip heat treatment spiral roller way is used for heat treatment of metal plates and strips, after heat exchange is completed between high-flow, high-pressure and high-speed cooling water sprayed by a high-pressure section gap nozzle or a low-pressure section high-density nozzle of a roller quenching machine and the metal plates and strips, the cooling water is discharged to two sides along the directions of the two sections of spiral grooves, and cooling soft spots and high-temperature zones of the metal plates and strips are avoided.
The transmission bearing seat comprises a half coupling, a bearing seat A, a double-row self-aligning bearing A, a framework oil seal A, a shaft sleeve I, a shaft sleeve II, a shaft sleeve III, a transparent cover I and a transparent cover II, wherein the framework oil seal is used for sealing the bearing, lubricating grease is prevented from overflowing, cooling water is prevented from entering the bearing, the shaft sleeve III is combined, the transparent cover II and a mechanical seal formed by a spiral roller body drainage groove are combined, the lubricating effect of the bearing is ensured by double sealing, the shaft sleeve I, the shaft sleeve II, the transparent cover I and the transparent cover II are used for axially positioning the bearing, and the bearing is prevented from being damaged due to axial movement.
The supporting bearing seat comprises a bearing seat B, a double-row self-aligning bearing B, a framework oil seal B, an end gland, a shaft sleeve IV, a shaft sleeve V, a through cover III and a blank cap, wherein the framework oil seal B is used for sealing the bearing, so that lubricating grease is prevented from overflowing and cooling water is prevented from entering the bearing; the mechanical seal formed by the shaft sleeve V, the transparent cover III and the spiral roller body drainage groove is combined, the lubricating effect of the bearing is ensured by double sealing, and the end gland, the shaft sleeve IV, the transparent cover III and the blank cap are used for axially positioning the bearing, so that the damage caused by axial movement of the bearing is prevented.
The roll collar is composed of two semicircular half shaft sleeves and two strip-shaped connecting blocks and is used for compensating grooves formed by segmented processing of spiral grooves, and the half shaft sleeves are connected with the strip-shaped connecting blocks through connecting screws.
The metal plate strip heat treatment spiral roller way has the following advantages:
1. the spiral groove adopts six-end threads, 6 water outlets are respectively designed at two ends of the roller, the water discharging area is large, and the water discharging effect is good.
2. The lead angle of the spiral groove is 25-30 degrees, and the lead is 200-400 mm, so that the sufficient contact area between the spiral roller way and the metal plate strip is ensured, and the drainage capacity is enhanced.
3. The sealing performance of the bearing seat cavity is guaranteed by adopting the mode of combining sealing ring sealing and mechanical sealing, cooling water is prevented from entering the bearing seat cavity, the bearing is good in lubricating condition, and the service life is long.
4. The roll collar adopts a split design, not only can realize the sectional control of the width flow of the metal plate strip, but also is convenient to disassemble, assemble and maintain.
Drawings
FIG. 1 is a schematic view of a layout of a hot strip metal heat treatment coil table according to the present invention;
FIG. 2 is a view showing the profile of a hot-treatment spiral roller bed for a metal sheet/strip according to the present invention;
FIG. 3 is a schematic view of the assembly of the hot strip metal plate of the present invention in a spiral roller bed;
FIG. 4 is a schematic view of a roll collar of a hot-treatment spiral roller for sheet metal strip according to the invention.
In the figure, 1 a sheet metal strip; 2, a high-pressure section gap nozzle of a roller type quenching machine; 3, a spiral roller way; 4, a high-density nozzle at a low-pressure section of the roller type quenching machine; 5 a spiral roller body; 6, a spiral groove; 7, a water drainage groove; 8 roller rings; 9 driving bearing seats; 10 supporting the bearing seat; 11 half coupling; 121 bearing seat A; 131 double-row self-aligning bearing A; 141 framework oil seal A; 122, bearing seat B; 132 double-row self-aligning bearing B; 142 framework oil seal B; 15 shaft sleeve I; 16 shaft sleeve II; 17, a shaft sleeve III; 18 through cover I; 19 through cover II; a 20-end gland; 21, a shaft sleeve IV; 22 shaft sleeves V; 23 through lid III; 24, covering the cover; 25 half shaft sleeves; 26 connecting blocks; 27 to which screws are attached.
Detailed Description
In this embodiment, a specific implementation process of a spiral roller bed for heat treatment of metal strips is provided, and a low-alloy steel plate with a thickness of 50mm, a width of 3200mm and a length of 12m is selected as an example to specifically describe the implementation process.
As shown in fig. 1-4, before the metal plate strip 1 enters the high-pressure section gap nozzle 2 or the low-pressure section high-density nozzle 4 of the roller quenching machine, the spiral roller bed 3 arranged on the rear bearing seat a121 of the roller quenching machine is connected with a transmission device through a half coupling 11 and rotates forward according to the process speed to drive the metal plate strip 1 to move forward, the high-pressure section gap nozzle 2 or the low-pressure section high-density nozzle 4 of the roller quenching machine sprays water according to the set water quantity and the set water pressure, the cooling residual water after heat exchange with the metal plate strip 1 is discharged directionally to two sides along the spiral groove 6 of the spiral roller body 5, and a small amount of cooling water flows to the transmission bearing seats 9 and the support bearing seats 10 at two sides; the mechanical seal is formed by a framework oil seal A141 of a transmission bearing seat 9, a shaft sleeve I15 and a transparent cover I18, cooling water is limited to enter a double-row self-aligning bearing A131, a small amount of cooling water enters a shaft sleeve III17 and a transparent cover II19 and is discharged along a drainage channel 7, and the shaft sleeve II16 is used for limiting the cooling water to enter the double-row self-aligning bearing A131; mechanical seal is formed by a framework oil seal B142 of the supporting bearing seat 10, a shaft sleeve IV21, a shaft sleeve V22 and a transparent cover III23, cooling water is limited to enter a double-row self-aligning bearing B132, and a small amount of cooling water enters the shaft sleeve V22 and the transparent cover III23 and is discharged along a drainage channel 7; the roll collar 8 consisting of the half shaft sleeve 25, the connecting block 26 and the connecting screw 27 is arranged at the middle processing groove of the spiral roller way 3, so that the groove is prevented from gathering more cooling water and influencing the uniform distribution of residual water on the surface of a metal plate strip. The end-capping 20 and the blank 24 serve on the one hand for sealing protection and on the other hand for maintenance. When the tail part of the metal plate strip 1 leaves a certain group of spiral roller ways 3, the reorganized spiral roller ways 3 stop rotating. And ending the concrete implementation process of the metal plate strip heat treatment spiral roller way.
Claims (4)
1. The metal plate strip heat treatment spiral roller way is characterized in that the metal plate strip heat treatment spiral roller way (3) is arranged at a high-pressure section and a partial low-pressure section of a roller quenching machine; the spiral roller way (3) comprises a spiral roller body (5), a transmission bearing seat (9), a supporting bearing seat (10) and a roller ring (8); the spiral roller body (5) is a driving roller provided with two sections of spiral grooves (6) with opposite rotation directions, and a roller ring (8) is arranged between the two sections of spiral grooves (6); drainage grooves (7) are arranged on two sides of the spiral roller body (5); the two sides of the spiral roller body (5) are respectively combined with a transmission bearing seat (9) and a support bearing seat (10) for mechanical sealing, so that cooling water is prevented from entering the bearing and the service life is shortened; the spiral groove (6) adopts six-head threads, the lead of the threads is 200-400 mm, the lead angle of the threads is 25-30 degrees, and no groove-shaped indentation is formed on the surface of the cooled metal plate strip (1); when the metal plate strip heat treatment spiral roller way (3) is used for heat treatment of the metal plate strip (1), after heat exchange is completed between high-flow, high-pressure and high-speed cooling water sprayed by a high-pressure section gap nozzle (2) or a low-pressure section high-density nozzle (4) of the roller quenching machine and the metal plate strip (1), the cooling water is discharged to two sides along the directions of the two sections of spiral grooves (6), and cooling soft spots and high-temperature zones of the metal plate strip (1) are avoided.
2. The metal plate strip heat treatment spiral roller way as claimed in claim 1, wherein the transmission bearing seat (9) comprises a half coupling (11), a bearing seat A (121), a double-row self-aligning bearing A (131), a framework oil seal A (141), a shaft sleeve I (15), a shaft sleeve II (16), a shaft sleeve III (17), a transparent cover I (18) and a transparent cover II (19), the framework oil seal (141) is used for sealing the bearing, lubricating grease is prevented from overflowing, meanwhile, cooling water is prevented from entering the bearing, the mechanical seal formed by the shaft sleeve III (17), the transparent cover II (19) and a spiral roller body (5) drainage groove (7) is combined, the lubricating effect of the bearing is ensured by double sealing, and the shaft sleeve I (15), the shaft sleeve II (16), the transparent cover I (18) and the transparent cover II (19) are used for axial positioning of the bearing.
3. The metal plate strip heat treatment spiral roller way as claimed in claim 1, wherein the supporting bearing seat (10) comprises a bearing seat B (122), a double-row self-aligning bearing B (132), a framework oil seal B (142), an end pressure cover (20), a shaft sleeve IV (21), a shaft sleeve V (22), a through cover III (23) and a blank cover (24), wherein the framework oil seal B (142) is used for sealing the bearing, and lubricating grease is prevented from overflowing and simultaneously cooling water is prevented from entering the bearing; the mechanical seal formed by combining the shaft sleeve V (22), the transparent cover III (23) and the drainage groove (7) of the spiral roller body (5) ensures the lubricating effect of the bearing through double sealing, and the end pressing cover (20), the shaft sleeve IV (21), the transparent cover III (23) and the blank cover (24) are used for axially positioning the bearing.
4. The hot-treatment spiral roller way for metal strips according to claim 1, characterized in that the roller ring (8) consists of two semicircular half-sleeves (25) and two strip-shaped connecting blocks (26) for compensating the grooves formed by the sectional machining of the spiral groove (6), and the half-sleeves (25) and the strip-shaped connecting blocks (26) are connected by connecting screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911213760.XA CN110923437A (en) | 2019-12-02 | 2019-12-02 | Metal plate strip heat treatment spiral roller way |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911213760.XA CN110923437A (en) | 2019-12-02 | 2019-12-02 | Metal plate strip heat treatment spiral roller way |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110923437A true CN110923437A (en) | 2020-03-27 |
Family
ID=69847112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911213760.XA Pending CN110923437A (en) | 2019-12-02 | 2019-12-02 | Metal plate strip heat treatment spiral roller way |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110923437A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111687693A (en) * | 2020-06-17 | 2020-09-22 | 广西先进铝加工创新中心有限责任公司 | Manufacturing method of metal brush roller of roller-hearth heat treatment furnace |
| CN113713476A (en) * | 2021-08-24 | 2021-11-30 | 中广核工程有限公司 | Driving device for drum-shaped filter screen |
| CN114891976A (en) * | 2022-05-26 | 2022-08-12 | 东北大学 | Rubber spiral roller for quenching aluminum alloy plate, quenching device and quenching method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202152851U (en) * | 2011-07-22 | 2012-02-29 | 山东齐鲁石化开泰实业股份有限公司 | Combined sealing device for driven shaft bearings |
| CN109207689A (en) * | 2018-10-19 | 2019-01-15 | 东北大学 | A kind of metal plates and strips roll-type quenching flow zone control device |
| CN208719165U (en) * | 2018-08-01 | 2019-04-09 | 南京源自电力自动化设备有限公司 | The new-type water blocking bearing block of rotary sieve |
-
2019
- 2019-12-02 CN CN201911213760.XA patent/CN110923437A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202152851U (en) * | 2011-07-22 | 2012-02-29 | 山东齐鲁石化开泰实业股份有限公司 | Combined sealing device for driven shaft bearings |
| CN208719165U (en) * | 2018-08-01 | 2019-04-09 | 南京源自电力自动化设备有限公司 | The new-type water blocking bearing block of rotary sieve |
| CN109207689A (en) * | 2018-10-19 | 2019-01-15 | 东北大学 | A kind of metal plates and strips roll-type quenching flow zone control device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111687693A (en) * | 2020-06-17 | 2020-09-22 | 广西先进铝加工创新中心有限责任公司 | Manufacturing method of metal brush roller of roller-hearth heat treatment furnace |
| CN111687693B (en) * | 2020-06-17 | 2021-12-17 | 广西先进铝加工创新中心有限责任公司 | Manufacturing method of metal brush roller of roller-hearth heat treatment furnace |
| CN113713476A (en) * | 2021-08-24 | 2021-11-30 | 中广核工程有限公司 | Driving device for drum-shaped filter screen |
| CN114891976A (en) * | 2022-05-26 | 2022-08-12 | 东北大学 | Rubber spiral roller for quenching aluminum alloy plate, quenching device and quenching method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110923437A (en) | Metal plate strip heat treatment spiral roller way | |
| CN101403032B (en) | Thermal treatment process for quick cutting steel composite roll | |
| CN104439933B (en) | Technological method for improving performance of large-diameter carbon steel cast and rolled flange part | |
| CN102274864B (en) | Ultrafast cooling technology-based cooling-after-rolling system | |
| CN102266872A (en) | Steel tube cooling device | |
| CN202322926U (en) | Nozzle installation structure of cast steel roll heat treatment spray quenching machine | |
| CN106825106A (en) | The technique of thin-walled hot rolled seamless steel tube in a kind of double-core axle two-roller skew-rolling production | |
| CN111136228A (en) | Control method for improving transverse cracks of corners of continuous casting billet | |
| CN101722191A (en) | Rolling mill roll cooling device | |
| CN104017983A (en) | Long-life steel billet conveying roller way for heating furnace | |
| CN202860982U (en) | Rollers of steel tube sizing and reducing mill and steel tube sizing and reducing mill using the same | |
| CN201704374U (en) | Cooling-free furnace roller device | |
| CN102586565A (en) | Rapid cooling method and device after medium and thick plate heat treatment furnace | |
| CN201154974Y (en) | Apparatus for rapidly and uniformly cooling roller | |
| CN209736579U (en) | Spiral cooling high-temperature-resistant clamping roller for continuous casting sector section of bloom | |
| CN108015109A (en) | A kind of high-speed steel combines edger roll | |
| CN201664706U (en) | Top spray laminar flow cooling device | |
| CN213067121U (en) | Double-loop water cooling structure for metallurgical furnace roller | |
| CN203343176U (en) | Roll system | |
| CN204140660U (en) | Metamerism roller bearing support | |
| CN210980503U (en) | Water circulation cooling device | |
| CN207508231U (en) | A kind of continuous small-billet casting cuts the preceding integral water-cooled elongated roller device of formula | |
| CN112045156A (en) | Roll sleeve structure for high-strength aluminum alloy casting and rolling and use method thereof | |
| CN203007322U (en) | Through furnace steel plate capable of improving effect of through furnace | |
| CN219059068U (en) | Water-cooled energy-saving furnace roller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Fu Tianliang Inventor after: Jia Zhiwei Inventor after: Zhang Zhifu Inventor after: Wang Zhaodong Inventor after: Wang Guodong Inventor after: Cui Wei Inventor after: Song Min Inventor before: Fu Tianliang Inventor before: Han Yi Inventor before: Wang Zhaodong Inventor before: Zhang Zhifu Inventor before: Zhang Xia |
|
| CB03 | Change of inventor or designer information | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200327 |
|
| WD01 | Invention patent application deemed withdrawn after publication |