CN212451506U - Heat treatment cooling device - Google Patents
Heat treatment cooling device Download PDFInfo
- Publication number
- CN212451506U CN212451506U CN202020793527.5U CN202020793527U CN212451506U CN 212451506 U CN212451506 U CN 212451506U CN 202020793527 U CN202020793527 U CN 202020793527U CN 212451506 U CN212451506 U CN 212451506U
- Authority
- CN
- China
- Prior art keywords
- cooling
- pool
- cooling medium
- chamber
- heat treatment
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The utility model discloses a heat treatment cooling device relates to heat treatment technical field. The heat treatment cooling device comprises two cooling chambers and two feeding devices, wherein each cooling chamber is internally provided with a cooling pool for containing a cooling medium, and is provided with a feeding hole and a discharging hole, wherein the cooling medium in the first cooling pool is cooling water, the cooling medium in the second cooling pool is cooling oil, and the discharging hole of the first cooling chamber is communicated with the feeding hole of the second cooling chamber; the two feeding devices are respectively arranged in the first cooling pool and the second cooling pool, each feeding device is provided with a bearing surface for bearing a workpiece, and each bearing surface is provided with a movable stroke moving vertically and a movable stroke moving from the feeding hole to the discharging hole. The utility model provides a heat treatment cooling device can select cooling rate according to the quality requirement of the different technologies of heat treatment and work piece, practices thrift the cost, and the cooling method is various.
Description
Technical Field
The utility model relates to a heat treatment technical field, in particular to heat treatment cooling device.
Background
Heat treatment refers to a hot metal working process in which a material is heated, held and cooled in the solid state to achieve a desired texture and properties. Cooling is an indispensable step in the heat treatment process, and the cooling method is different according to different processes and mainly controls the cooling speed. The cooling speed of the general annealing is the slowest, at present, the annealing is generally to introduce water into the furnace wall, and the low-temperature water is utilized to absorb the heat of the furnace body and then is discharged out of the furnace body; the quenching is carried out at a high cooling rate, and the workpiece is generally directly immersed into a quenching medium (water or oil).
Even during quenching, in order to ensure the quality of workpieces, the cooling speeds required by different temperature stages are different, as shown in fig. 1, according to the cooling temperature of ideal quenching, the cooling speed needs to be fast first and slow later, and if the selected quenching medium is water, although the cooling capacity is strong, the cooling speed is too fast near the Ms point, so that the quality is influenced; if the quenching medium is oil, the cooling near the Ms point is slow, the deformation and cracking tendency can be effectively reduced, but the cooling capacity of a high-temperature area is low, and the quality of a workpiece is influenced. However, the cooling speed of the existing heat treatment cooling device is single, different cooling devices are required for annealing and quenching generally, the operation is complicated, the cost is high, and the requirement of the change of the cooling speed when the quality requirement of a workpiece is high can not be met.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a heat treatment cooling device, which aims to solve the problem that the cooling speed of the existing heat treatment cooling device is single.
To achieve the above object, the present invention provides a heat treatment cooling device, including:
each cooling chamber is internally provided with a cooling pool for containing a cooling medium, and is provided with a feeding hole and a discharging hole, wherein the cooling medium in the first cooling pool is cooling water, the cooling medium in the second cooling pool is cooling oil, and the discharging hole of the first cooling chamber is communicated with the feeding hole of the second cooling chamber; and the number of the first and second groups,
two material feeding unit set up respectively in first cooling bath with in the second cooling bath, material feeding unit has the loading end that is used for bearing the work piece, the loading end has vertically to the activity stroke that removes and certainly the feed inlet to the activity stroke that the discharge gate removed.
Optionally, a spray header is arranged at the upper part of each cooling chamber for spraying the cooling medium into the cooling chamber.
Optionally, the carrying surface has a movable stroke moving vertically, and has a submerged position below the liquid level of the cooling medium and an initial position higher than the liquid level;
and a discharge port is also arranged on the side wall of each cooling pool and is positioned between the level of the immersion position and the level of the liquid level of the cooling medium.
Optionally, the heat treatment cooling device further comprises a cooling medium storage pool and a water pump, an outlet of the cooling medium storage pool is connected with the water pump, the water pump is connected with the spray header, and the discharge port is connected with an inlet of the cooling medium storage pool.
Optionally, a condenser is further disposed between the discharge port and the cooling medium storage pool, one end of the condenser is connected to the discharge port, and the other end of the condenser is connected to an inlet of the cooling medium storage pool.
Optionally, the heat treatment cooling device further comprises a plurality of water spray pipes, the plurality of water spray pipes are arranged in the cooling chamber, and water outlets of the plurality of water spray pipes are arranged on the inner wall of the cooling tank at intervals along the circumferential direction of the cooling tank.
Optionally, the level of the outlets of a plurality of said sprinklers corresponds to the level of said submerged position.
Optionally, the peripheral to central direction of the cooling pool is a first direction, and the sprinkler pipes have sprinkler heads that are all disposed toward the same side of the first direction.
Optionally, the feeding device comprises:
a frame;
the conveying roller way is arranged on the rack and used for conveying workpieces to move from the feeding hole to the discharging hole; and the number of the first and second groups,
and the lifting mechanism is arranged at the bottom of the cooling pool, is connected with the rack and is used for driving the rack to move in the vertical direction.
In the technical scheme of the utility model, two cooling chambers and two feeding devices are arranged, and each cooling chamber is provided with a cooling pool for containing cooling medium, the cooling medium in the first cooling pool is cooling water, and the cooling medium in the second cooling pool is cooling oil; the feeding device is provided with a bearing surface for bearing a workpiece, and the bearing surface is provided with a movable stroke moving vertically and a movable stroke moving from the feeding hole to the discharging hole. During the annealing process, the moving stroke of the bearing surface is a horizontal moving stroke moving from the feeding hole to the discharging hole, namely the bearing surface is positioned above the liquid level of the cooling medium, and the cooling in a cooling chamber with water as the cooling medium or a cooling chamber with oil as the cooling medium can be selected according to different annealing speeds required by the material of the workpiece; when the quenching process is carried out, if the quality requirement of the workpiece is low, the workpiece is immersed into cooling water or cooling oil for rapid cooling through the vertical moving stroke of the bearing surface according to the material of the workpiece, and when the quality requirement of the workpiece is high, the workpiece is immersed into the cooling water for cooling and then is immersed into the cooling oil for cooling, so that the high quality requirement of the workpiece is met. Therefore, the utility model provides a heat treatment cooling device can select cooling rate according to the quality requirement of the different technologies of heat treatment and work piece, practices thrift the cost, and the cooling method is various.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a graph of cooling temperatures for an ideal quench;
fig. 2 is a schematic view of an embodiment of a thermal treatment cooling apparatus according to the present invention.
FIG. 3 is a top view of the sprinkler tube of FIG. 2.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The cooling speed of the existing heat treatment cooling device is single, different cooling devices are required for annealing and quenching generally, the operation is complicated, the cost is high, and the requirement of the change of the cooling speed when the requirement of the quality of a workpiece is high can not be met. In view of this, the utility model provides a heat treatment cooling device has solved the comparatively single problem of current heat treatment device cooling rate. Fig. 2 is a schematic view of an embodiment of a thermal treatment cooling apparatus according to the present invention.
Referring to fig. 2, the heat treatment cooling device provided by the present invention includes two cooling chambers 1 and two feeding devices 2, a cooling pool 12 for accommodating a cooling medium is disposed in each cooling chamber 1, the cooling chamber 1 is provided with a feeding port and a discharging port, wherein the cooling medium in the first cooling pool 12a is cooling water, the cooling medium in the second cooling pool 12b is cooling oil, and the discharging port of the first cooling chamber 1a is communicated with the feeding port of the second cooling chamber 1 b; the two feeding devices 2 are respectively arranged in the first cooling pool 12a and the second cooling pool 12b, the feeding devices 2 are provided with bearing surfaces for bearing workpieces, and the bearing surfaces are provided with movable strokes for moving vertically and movable strokes for moving from the feeding hole to the discharging hole.
In one embodiment, the feeding device 2 conveys the workpiece into the first cooling pool 12a from the feeding port, the carrying surface vertically moves downward to be immersed in the cooling water, after the workpiece is cooled to a certain temperature (i.e. the temperature is at Ms point, different workpieces have different temperatures, depending on the actual situation), the carrying surface vertically moves upward to the level of the feeding port 100 of the first cooling chamber and the discharging port 101 of the first cooling chamber under the action of the feeding device 2, then moves from the feeding port 100 of the first cooling chamber to the discharging port 101 of the first cooling chamber in the horizontal direction to the second cooling chamber 1b, then vertically moves downward to be immersed in the cooling oil, is cooled to room temperature, then vertically moves upward to the level of the feeding port 110 of the second cooling chamber and the discharging port 111 of the second cooling chamber under the action of the feeding device 2, and finally moves from the feeding port 110 of the second cooling chamber to the outside of the cooling chamber 1 in the horizontal direction of the discharging port 111 of the second cooling chamber, and finishing cooling. The cooling mode is mainly used for quenching process treatment with high requirements on workpiece quality.
In one embodiment, the feeding device 2 conveys the workpiece into the first cooling pool 12a from the feeding hole, then the bearing surface vertically moves downwards until the bearing surface is immersed in the cooling water, after the workpiece is cooled to room temperature, the bearing surface vertically moves upwards to the level of the feeding hole 100 of the first cooling chamber and the discharge hole 101 of the first cooling chamber under the action of the feeding device 2, then the workpiece is horizontally conveyed into the second cooling chamber 1b and conveyed out of the cooling chamber 1, and the cooling is finished. The cooling mode is mainly used for quenching treatment which has low requirement on the quality of the workpiece and needs high cooling speed. When the workpiece needs to be quenched at a relatively slow cooling speed, the workpiece is conveyed into the second cooling tank 12b and immersed in oil for cooling, the principle is similar to that of a process of only immersing in water for cooling, and details are not repeated here.
In one embodiment, the liquid level of the cooling medium is lower than the level of the feed port and the discharge port, the moving stroke of the carrying surface is a moving stroke moving horizontally from the feed port to the discharge port, the workpiece is not in contact with the cooling medium, and the workpiece is cooled by the cooling medium in the cooling pool 12 absorbing the heat of the cooling chamber 1. In specific implementation, the corresponding cooling medium can be selected for cooling according to the cooling speed required by the material of the workpiece. Such a cooling method is mostly used for cooling the annealing process.
Further, a spray header 12 is provided at an upper portion of each cooling chamber 1 to spray a cooling medium into the cooling chamber 1. The spray header 12 sprays the cooling medium into the cooling chamber 1 while the bearing surface is not moved vertically upward, i.e. the bearing surface is above the surface of the cooling medium. The cooling is carried out by spraying the cooling medium, the cooling speed is lower than that of a cooling mode that the workpiece is directly immersed in the cooling medium, the cooling speed is higher than that of the workpiece which is not contacted with the cooling medium, and the cooling speed for absorbing the heat of the cooling chamber 1 by the cooling medium is higher, so that the cooling device can be used for cooling a heat treatment tempering process. Specifically, the workpiece is cooled by spraying cooling water in the first cooling chamber 1a or cooling oil in the second cooling chamber 1b, and a suitable cooling medium can be selected according to the material of the workpiece, and the cooling speed can be adjusted by adjusting the flow rate and the volume of the cooling medium sprayed by the spray header 12.
In one embodiment, after the workpiece is immersed in the cooling medium in the cooling bath 12, the temperature of the cooling medium in contact with the workpiece is rapidly increased due to the high temperature of the workpiece. Therefore, the cooling pool 12 is provided with the spray header 12 to spray the cooling medium, and the cooling medium in the cooling chamber 1 can be cooled.
Further, the carrying surface has a moving stroke moving vertically, and has an immersed position below the liquid level of the cooling medium and an initial position higher than the liquid level, please refer to fig. 2, the carrying surface of the first cooling pool 12a is at the immersed position, and the carrying surface of the second cooling pool 12b is at the initial position; each cooling tank 12 is also provided with a discharge opening 16 in the side wall, which discharge opening 16 is arranged between the level of the submerged position and the level of the cooling medium level according to the principle of the cold water falling when the hot water rises. Therefore, the cooling chamber 1 can spray the cooling medium with lower temperature through the spray header 12, and simultaneously discharge the cooling medium with higher temperature due to the contact with the workpiece from the discharge port 16, so that the temperature of the cooling medium in the cooling chamber 1 is more stable, the cooling speed of the workpiece is ensured, and the quality of the workpiece is ensured.
The heat treatment cooling device also comprises a cooling medium storage pool 14 and a water pump 15, wherein an outlet 142 of the cooling medium storage pool 14 is connected with the water pump 15, the water pump 15 is connected with the spray header 12, and a discharge port 16 is connected with an inlet 141 of the cooling medium storage pool 14, so that a cooling medium circulating system is formed. The water pump 15 provides power to transport the cooling medium in the cooling medium storage pool 14 to the spray header 12, and the cooling medium can be recycled, so that the cost is saved.
In order to stabilize the temperature of the cooling medium sprayed by the spray header 12, a condenser 17 is further arranged between the water outlet and the cooling medium storage pool 14, one end of the condenser 17 is connected with the discharge port 16, the cooling medium with higher temperature discharged by the discharge port 16 is cooled, and then the cooling medium is input into the cooling medium storage pool 14 for standby.
In another embodiment, the heat treatment cooling device further comprises a plurality of water spraying pipes 121, the plurality of water spraying pipes 121 are arranged in the cooling chamber 1, and water outlets of the plurality of water spraying pipes are arranged on the inner wall of the cooling pool 12 at intervals along the circumferential direction of the cooling pool 12, so that when the heat treatment cooling treatment is performed, a cooling medium is sprayed into the cooling pool 12 to reduce the temperature of the cooling pool 12.
Further, the level of the outlets of the plurality of sprinkler pipes 121 corresponds to the level of the submerged position. It should be noted that equivalent means here equal and approximately equal, i.e. the level of the water outlet is the same as the level of the submerged position. The water outlet is arranged at the position, so that the cooling medium which is just sprayed out can be contacted with the workpiece, and the cooling speed is high. Referring to fig. 3, the direction from the periphery to the center of the cooling pool 12 is a first direction, the water spraying pipe 121 has water spraying heads 122, and the water spraying heads 122 are all disposed toward the same side of the first direction. It should be noted that the sprinkler heads 122 are disposed toward the same side of the first direction, i.e., the sprinkler heads 122 are disposed on the left or right side of the first direction. Because the cooling medium contacting with the workpiece is heated rapidly and wraps the metal during the cooling treatment, and other cooling media are difficult to contact with the metal rapidly, the arrangement of the water spray head 122 enables the cooling medium sprayed by the water spray head 122 to form a vortex, promotes the flow of the cooling medium at various positions of the immersion position, namely the flow of the cooling medium around the workpiece, and enables the temperature of the cooling medium around the workpiece to be low and stable.
The utility model discloses do not restrict material feeding unit 2's embodiment, as long as satisfy the loading end can to with vertical to removing at the level can. In an embodiment, the feeding device 2 includes a frame 21, a roller conveyor 22 and a lifting mechanism 23, the roller conveyor 22 is disposed on the frame 21 and used for conveying the workpiece to move from the feeding port to the discharging port, and the lifting mechanism 23 is mounted at the bottom of the cooling tank 12 and connected to the frame 21 and used for driving the workpiece to move in the vertical direction. The rollgang 22 is composed of a motor (not shown in the figure), a transmission shaft (not shown in the figure) and a plurality of rollers (not shown in the figure), the rollers are driven by the motor to rotate to convey workpieces, and the lifting mechanism 23 can be realized by arranging an electric telescopic rod. The movement of the roller conveyor 22 in the horizontal direction and the movement of the lifting mechanism 23 in the vertical direction are conventional in the art and will not be explained in more detail here. It should be noted that the first cooling bath 12a and the second cooling bath 12b are identical in arrangement, structure, and principle except for the difference in the cooling medium.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (9)
1. A heat treatment cooling apparatus, comprising:
the cooling device comprises two cooling chambers, a first cooling chamber and a second cooling chamber, wherein each cooling chamber is internally provided with a cooling pool for containing a cooling medium, each cooling chamber is provided with a feeding hole and a discharging hole, a first cooling pool is arranged in the first cooling chamber, a second cooling pool is arranged in the second cooling chamber, the cooling medium in the first cooling pool is cooling water, the cooling medium in the second cooling pool is cooling oil, and the discharging hole of the first cooling chamber is communicated with the feeding hole of the second cooling chamber; and the number of the first and second groups,
two material feeding unit set up respectively in first cooling bath with in the second cooling bath, material feeding unit has the loading end that is used for bearing the work piece, the loading end has vertically to the activity stroke that removes and certainly the feed inlet to the activity stroke that the discharge gate removed.
2. The thermal processing cooling apparatus of claim 1, wherein each of said cooling chambers is provided at an upper portion thereof with a shower head for spraying said cooling medium into said cooling chamber.
3. The thermal process cooling device of claim 2, wherein said carrying surface has a moving stroke moving vertically with a submerged position below the liquid level of said cooling medium and an initial position above said liquid level;
and a discharge port is also arranged on the side wall of each cooling pool and is positioned between the level of the immersion position and the level of the liquid level of the cooling medium.
4. The thermal processing cooling device according to claim 3, further comprising a cooling medium reservoir and a water pump, wherein an outlet of the cooling medium reservoir is connected to the water pump, the water pump is connected to the shower head, and the discharge port is connected to an inlet of the cooling medium reservoir.
5. The thermal processing cooling device according to claim 4, wherein a condenser is further provided between the discharge port and the cooling medium reservoir, and one end of the condenser is connected to the discharge port and the other end thereof is connected to an inlet of the cooling medium reservoir.
6. The thermal processing cooling device of claim 3, further comprising a plurality of water spray pipes, wherein a plurality of the water spray pipes are arranged in the cooling chamber, and water outlets of the plurality of the water spray pipes are arranged on the inner wall of the cooling tank at intervals along the circumferential direction of the cooling tank.
7. The thermal process cooling device of claim 6, wherein the water outlets of a plurality of said water spray pipes have the same level as the level of said submerged position.
8. The thermal processing cooling apparatus of claim 7, wherein the periphery-to-center direction of the cooling pool is a first direction;
the sprinkler pipe is provided with sprinkler heads which are arranged towards the same side of the first direction.
9. The thermal processing cooling apparatus of claim 1, wherein said feed means comprises:
a frame;
the conveying roller way is arranged on the rack and used for conveying workpieces to move from the feeding hole to the discharging hole; and the number of the first and second groups,
and the lifting mechanism is arranged at the bottom of the cooling pool, is connected with the rack and is used for driving the rack to move in the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020793527.5U CN212451506U (en) | 2020-05-13 | 2020-05-13 | Heat treatment cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020793527.5U CN212451506U (en) | 2020-05-13 | 2020-05-13 | Heat treatment cooling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212451506U true CN212451506U (en) | 2021-02-02 |
Family
ID=74482037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020793527.5U Expired - Fee Related CN212451506U (en) | 2020-05-13 | 2020-05-13 | Heat treatment cooling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212451506U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116445706A (en) * | 2023-06-20 | 2023-07-18 | 昆山业展电子有限公司 | Heat treatment furnace and heat treatment method for alloy resistance material |
-
2020
- 2020-05-13 CN CN202020793527.5U patent/CN212451506U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116445706A (en) * | 2023-06-20 | 2023-07-18 | 昆山业展电子有限公司 | Heat treatment furnace and heat treatment method for alloy resistance material |
| CN116445706B (en) * | 2023-06-20 | 2023-09-05 | 昆山业展电子有限公司 | Heat treatment furnace and heat treatment method for alloy resistance material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111363892A (en) | Heat treatment cooling device | |
| CN212451506U (en) | Heat treatment cooling device | |
| CN104313274B (en) | A kind of aluminium alloy annular element spray quench equipment and using method thereof | |
| CN214655138U (en) | Quick quenching device for bearing machining | |
| CN113234904B (en) | High-flux preparation method and device of gradient material | |
| CN212669757U (en) | Quenching equipment | |
| CN102747205B (en) | Water quenching system for producing cold rolling phase transition reinforced high strength strip steel | |
| CN200940150Y (en) | Spray type water quenching cooling apparatus for extrudate | |
| CN104451496A (en) | Steel coating device and production method thereof | |
| CN111893272A (en) | Basket type automatic quenching treatment system | |
| CN216337878U (en) | High-speed continuous-drawing heat treatment processing line | |
| CN115522034A (en) | Crankshaft isothermal quenching device | |
| CN116855866A (en) | Intelligent equipment control process for hot-dip galvanizing of double-end stud without pickling | |
| CN110804689A (en) | Spray quenching device with rotating effect and using method thereof | |
| CN114107645B (en) | Multifunctional isothermal normalizing furnace for alloy bars and working method thereof | |
| CN216838076U (en) | Efficient water mist quenching device with uniform and controllable cooling speed | |
| CN212152380U (en) | Environment-friendly spring steel wire processingequipment | |
| CN211284509U (en) | Copper wire tinning device with water circulation | |
| CN209759510U (en) | Liquid bismuth alloy quenching device | |
| CN102747213B (en) | Cooling method for continuous heat treatment of high-strength steel | |
| CN216891104U (en) | Automatic uniform cooling device of heat treatment furnace | |
| CN220520568U (en) | Steel pipe quenching device | |
| CN217147764U (en) | Cold quenching device for production of precision parts | |
| CN215571588U (en) | Cooling equipment is used in machine parts processing | |
| CN204401087U (en) | A kind of coater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210202 |