CN112413063A - New forms of energy engineering machine tool dead axle formula gearbox assembly - Google Patents
New forms of energy engineering machine tool dead axle formula gearbox assembly Download PDFInfo
- Publication number
- CN112413063A CN112413063A CN202011410204.4A CN202011410204A CN112413063A CN 112413063 A CN112413063 A CN 112413063A CN 202011410204 A CN202011410204 A CN 202011410204A CN 112413063 A CN112413063 A CN 112413063A
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- China
- Prior art keywords
- gear
- shaft
- output shaft
- shifting
- assembly
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- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
- F16H3/20—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially using gears that can be moved out of gear
- F16H3/22—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially using gears that can be moved out of gear with gears shiftable only axially
- F16H3/30—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially using gears that can be moved out of gear with gears shiftable only axially with driving and driven shafts not coaxial
- F16H3/32—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially using gears that can be moved out of gear with gears shiftable only axially with driving and driven shafts not coaxial and an additional shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0402—Cleaning of lubricants, e.g. filters or magnets
- F16H57/0404—Lubricant filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0447—Control of lubricant levels, e.g. lubricant level control dependent on temperature
- F16H57/0449—Sensors or indicators for controlling the fluid level
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0437—Smoothing ratio shift by using electrical signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/32—Gear shift yokes, e.g. shift forks
Abstract
The invention discloses a fixed shaft type gearbox assembly of new energy engineering machinery, wherein an input shaft assembly, a middle shaft assembly and an output shaft assembly of the fixed shaft type gearbox assembly are sequentially arranged in a box body from top to bottom; the input shaft assembly comprises an input shaft gear and an input shaft connected with the motor through a spline; the intermediate shaft assembly comprises two intermediate shaft gears fixed in the middle of the box body through bearings; the output shaft assembly comprises a high-low gear, a front output flange, a rear output flange and an output shaft, the high-low gear is mounted on the output shaft fixed at the lower part of the box body through a sliding bearing, the left end of the output shaft is provided with the rear output flange, and the right end of the output shaft is provided with the front output flange with a parking brake; the small end of the high-low gear and the middle part of the output shaft are both provided with gear shifting external teeth with the same size and tooth number; the middle part of the output shaft is provided with a gear shifting gear sleeve, the inner ring of the output shaft is provided with gear shifting inner teeth, the outer ring of the output shaft is provided with a ring groove, a shifting fork on a gear shifting fork mechanism is inserted into the ring groove, and the gear shifting inner teeth are meshed with the gear shifting outer teeth. The invention has the advantages of energy saving, high efficiency, low manufacturing and maintenance cost and convenient operation.
Description
Technical Field
The invention relates to a gearbox assembly of engineering machinery, in particular to a fixed-shaft gearbox assembly of new energy engineering machinery.
Background
The traditional engineering machinery uses diesel oil as a main energy source, has the defects of emission, environment pollution, low energy utilization rate and serious resource waste, and is a necessary choice for searching new energy engineering machinery for replacing petroleum under the pressure of energy crisis and environmental pollution problems. The engineering machinery is widely applied to construction fields such as construction sites, mines, ports, roads and the like, has high energy consumption, large noise and serious pollution, and an environment-friendly, energy-saving and efficient power system is urgently needed on the premise that the market needs to meet the operation performance.
The gearbox assembly is one of the key parts of the power system of the engineering machinery, is a mechanism for changing the rotating speed and the torque from an engine, and can change the transmission ratio of an output shaft in a fixed or stepped mode. At present, domestic engineering machinery is still in a starting stage in the field of new energy, the common method is to use the existing gearbox assembly configured on a diesel engine, and the problems of heavy weight, more gears, complex operation, high cost and the like exist. Therefore, a new energy engineering machinery fixed shaft type gearbox assembly is provided to solve the problem.
Disclosure of Invention
The invention aims to overcome the defects and provide the new energy engineering machinery fixed shaft type gearbox assembly which is energy-saving, environment-friendly, efficient, simple in structure, low in manufacturing and maintenance cost and convenient to operate, so as to solve the problems of heavy weight, multiple gears, complex operation and high cost of the new energy engineering machinery fixed shaft type gearbox assembly in the prior art.
In order to achieve the purpose, the new energy engineering machinery fixed shaft type gearbox assembly comprises a box body, an input shaft assembly, a middle shaft assembly, an output shaft assembly and a shifting fork mechanism, wherein the input shaft assembly, the middle shaft assembly and the output shaft assembly are sequentially arranged from top to bottom, and a shifting fork on the shifting fork mechanism is positioned in the middle of the output shaft assembly; the input shaft assembly comprises an input shaft and an input shaft gear, the input shaft gear is connected and installed on the input shaft through a spline, the input shaft is fixed on the upper part of the box body through bearings at two ends, and the input shaft is connected with the motor through the spline; the middle shaft assembly comprises a middle shaft gear I, a middle shaft and a middle shaft gear II, the middle shaft gear I and the middle shaft gear II are both installed on the middle shaft through spline connection, and the middle shaft is fixed in the middle of the box body through bearings at two ends; the output shaft assembly comprises a high-speed gear, a rear output flange, a low-speed gear, an output shaft and a front output flange, the high-speed gear and the low-speed gear are mounted on the output shaft through sliding bearings, the output shaft is fixed on the lower part of the box body through bearings at two ends, the rear output flange is mounted at the left end of the output shaft, the front output flange is mounted at the right end of the output shaft, and the parking brake is mounted on the front output flange; the input shaft gear is meshed with the first intermediate shaft gear, the first intermediate shaft gear is meshed with the high-speed gear, and the second intermediate shaft gear is meshed with the low-speed gear; the small ends of the high-speed gear and the low-speed gear are provided with gear shifting external teeth, the middle part of the output shaft is provided with gear shifting external teeth, and the gear shifting external teeth on the high-speed gear, the gear shifting external teeth on the low-speed gear and the gear shifting external teeth on the output shaft are the same in size and number; the middle part of the output shaft is provided with a gear shifting gear sleeve, the inner ring of the gear shifting gear sleeve is provided with gear shifting inner teeth, the outer ring of the gear shifting gear sleeve is provided with a ring groove, the gear shifting inner teeth of the gear shifting gear sleeve are meshed with the gear shifting outer teeth on the output shaft, and the widths of the gear shifting inner teeth and the gear shifting outer teeth are the; and a shifting fork on the shifting fork mechanism is inserted into the annular groove of the shifting gear sleeve, so that the gearbox assembly forms two gears to realize two-stage speed reduction.
The speed measuring gear is arranged on the output shaft, and the shifting fork gear shifting mechanism is enabled to shift gears at a reasonable rotating speed through the electric control system so as to realize stable gear shifting of the gearbox assembly.
The bottom of box is installed the oil drain plug, is equipped with the powerful magnet that is arranged in adsorbing the iron powder in the fluid and impurity on the oil drain plug to ensure the fluid cleanliness.
The box body is provided with a liquid level meter which is positioned on the horizontal line of the output shaft, and an oil filling pipe is arranged below the liquid level meter, so that an operator can directly observe the condition of lubricating oil in the box, and the gearbox assembly can be conveniently maintained in daily life.
The upper end of box is equipped with the breather valve to avoid the gearbox assembly to lead to the intracavity pressure increase because of the oil temperature risees at the during operation, cause the problem of sealing washer oil leak, can also dispel certain heat simultaneously, improved product quality greatly.
The new energy engineering machinery dead axle type gearbox assembly with the structure has the following technical characteristics and beneficial effects:
1. the invention has two-stage speed reduction, well ensures the transmission efficiency, reduces the volume and the weight of the gearbox assembly, well reduces the product cost and ensures more stable and reliable transmission under the condition of meeting the transmission ratio.
2. Through setting up the shift fork mechanism of shifting, make the gearbox assembly realize two fender positions, satisfied the change demand of the engineering machine tool speed of a motor vehicle and moment of torsion in the work well, the power consumption performance is more excellent, and it is more convenient to control.
3. The speed measuring gear is arranged on the output shaft, and the shifting fork gear shifting mechanism can execute gear shifting at a reasonable rotating speed through the electric control system, so that the gear shifting of the gearbox assembly is more stable, and the comfort of the whole machine is greatly improved.
4. Install the oil drain plug in the bottom of box, be equipped with powerful magnet on the oil drain plug, powerful magnet can adsorb iron powder and impurity in the fluid well, has guaranteed the fluid cleanliness, has improved the quality of product greatly.
5. Through the setting of level gauge, make operating personnel can the direct observation incasement lubricating oil the condition, the gearbox assembly's of being convenient for routine maintenance.
6. Through setting up the breather valve, avoided the gearbox assembly to cause the problem of sealing washer oil leak because of oil temperature rising, intracavity pressure increase at the during operation, can also dispel certain heat simultaneously, improved product quality greatly.
The new energy engineering machinery fixed shaft type gearbox assembly solves the problems of heavy weight, multiple gears, complex operation and high cost of the existing new energy engineering machinery fixed shaft type gearbox assembly, and greatly improves enterprise benefits and market competitiveness of products.
Drawings
FIG. 1 is a schematic diagram of a fixed-axis gearbox assembly of the new energy engineering machinery.
Reference numerals: the gearbox comprises a box body 1, an input shaft gear 2, an input shaft 3, a first intermediate shaft gear 4, a high-speed gear 5, a rear output flange 6, an intermediate shaft 7, a second intermediate shaft gear 8, a low-speed gear 9, an output shaft 10, a front output flange 11 and a shifting fork mechanism 12.
Detailed Description
The new energy engineering machinery dead axle type transmission assembly of the invention is further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the fixed shaft type transmission assembly of the new energy engineering machinery of the present invention includes a box body 1, an input shaft assembly, an intermediate shaft assembly, an output shaft assembly and a shifting fork mechanism 12, wherein the input shaft assembly, the intermediate shaft assembly and the output shaft assembly are arranged in sequence from top to bottom, and a shifting fork on the shifting fork mechanism 12 is located in the middle of the output shaft assembly; the input shaft assembly comprises an input shaft 3 and an input shaft gear 2, the input shaft gear 2 is connected and installed on the input shaft 3 through a spline, the input shaft 3 is fixed on the upper part of the box body 1 through bearings at two ends, and the input shaft 3 is connected with the motor through a spline; the middle shaft assembly comprises a middle shaft gear I4, a middle shaft 7 and a middle shaft gear II 8, the middle shaft gear I4 and the middle shaft gear II 8 are both arranged on the middle shaft 7 through spline connection, and the middle shaft 7 is fixed in the middle of the box body 1 through bearings at two ends; the output shaft assembly comprises a high-speed gear 5, a rear output flange 6, a low-speed gear 9, an output shaft 10 and a front output flange 11, the high-speed gear 5 and the low-speed gear 9 are mounted on the output shaft 10 through sliding bearings, the output shaft 10 is fixed on the lower part of the box body 1 through bearings at two ends, the rear output flange 6 is mounted at the left end of the output shaft 10, the front output flange 11 is mounted at the right end of the output shaft 10, and the parking brake is mounted on the front output flange 11; the input shaft gear 2 is meshed with the first intermediate shaft gear 4, the first intermediate shaft gear 4 is meshed with the high-speed gear 5, and the second intermediate shaft gear 8 is meshed with the low-speed gear 9; the small ends of the high-speed gear 5 and the low-speed gear 9 are provided with gear shifting external teeth, the middle part of the output shaft 10 is provided with gear shifting external teeth, and the gear shifting external teeth on the high-speed gear 5, the low-speed gear 9 and the output shaft 10 are the same in size and number of teeth; the middle part of the output shaft 10 is provided with a gear shifting gear sleeve, the inner ring of the gear shifting gear sleeve is provided with gear shifting inner teeth, the outer ring of the gear shifting gear sleeve is provided with a ring groove, the gear shifting inner teeth of the gear shifting gear sleeve are meshed and matched with the gear shifting outer teeth on the output shaft 10, and the widths of the gear shifting inner teeth and the gear shifting outer teeth; and a shifting fork on the shifting fork mechanism 12 is inserted into an annular groove of the shifting gear sleeve, so that the gearbox assembly forms two gears to realize two-stage speed reduction.
The output shaft 10 is provided with a speed measuring gear, and the shifting fork gear shifting mechanism 12 is enabled to shift gears at a reasonable rotating speed through an electric control system, so that stable gear shifting of the gearbox assembly is realized.
The bottom of box 1 installs the oil drain plug, is equipped with the powerful magnet that is arranged in adsorbing the iron powder in the fluid and impurity on the oil drain plug to ensure the fluid cleanliness.
The box body 1 is provided with a liquid level meter which is positioned on the horizontal line of the output shaft 10, and an oil filling pipe is arranged below the liquid level meter, so that an operator can directly observe the condition of lubricating oil in the box, and the daily maintenance of the gearbox assembly is facilitated.
The upper end of the box body 1 is provided with a ventilation valve so as to avoid the problem that the oil leakage of the sealing ring is caused by the increase of the pressure in the cavity caused by the rise of the oil temperature when the gearbox assembly works, and meanwhile, certain heat can be dissipated, so that the product quality is greatly improved.
The working principle of the fixed shaft type gearbox assembly of the new energy engineering machinery is as follows:
1. when a high-speed gear is engaged: the shifting fork on the shifting fork mechanism 12 pushes the shifting gear sleeve on the output shaft 10 to move towards the direction of the high-speed gear 5, so that shifting inner teeth of an inner ring of the shifting gear sleeve are meshed with the high-speed gear 5 and shifting outer teeth on the output shaft 10 together, power is transmitted to the input shaft gear 2 from the motor through the input shaft 3, the input shaft gear 2 transmits power to the intermediate shaft gear 4, the intermediate shaft gear 4 transmits power to the high-speed gear 5, the high-speed gear 5 transmits power to the output shaft 10, the rear output flange 6 and the front output flange 11 on the output shaft 10 transmit power to the front and rear drive axle assemblies, at the moment, the intermediate shaft gear two 8 and the low-speed gear 9 idle rotate, and no power is output.
2. When engaging in a low gear: the shifting fork on the shifting fork mechanism 12 pushes the shifting gear sleeve on the output shaft 10 to move towards the direction of the low-speed gear 9, so that shifting inner teeth of an inner ring of the shifting gear sleeve are meshed with the low-speed gear 9 and shifting outer teeth on the output shaft 10 together, power is transmitted to the input shaft gear 2 from the motor through the input shaft 3, the input shaft gear 2 transmits power to the intermediate shaft gear I4, the intermediate shaft gear I4 transmits power to the intermediate shaft 7, the intermediate shaft 7 transmits power to the intermediate shaft gear II 8, the intermediate shaft gear II 8 transmits power to the low-speed gear 9, the low-speed gear 9 transmits power to the output shaft 10, the rear output flange 6 and the front output flange 11 on the output shaft 10 transmit power to the front and rear drive axle assembly, at the moment, the high-speed gear 5 idles, and.
Claims (5)
1. A new energy engineering machinery dead axle formula gearbox assembly, characterized by: the gearbox comprises a box body, an input shaft assembly, a middle shaft assembly, an output shaft assembly and a shifting fork mechanism, wherein the input shaft assembly, the middle shaft assembly and the output shaft assembly are sequentially arranged from top to bottom, and a shifting fork on the shifting fork mechanism is positioned in the middle of the output shaft assembly; the input shaft assembly comprises an input shaft and an input shaft gear, the input shaft gear is connected and installed on the input shaft through a spline, the input shaft is fixed on the upper part of the box body through bearings at two ends, and the input shaft is connected with the motor through the spline; the middle shaft assembly comprises a middle shaft gear I, a middle shaft and a middle shaft gear II, the middle shaft gear I and the middle shaft gear II are both installed on the middle shaft through spline connection, and the middle shaft is fixed in the middle of the box body through bearings at two ends; the output shaft assembly comprises a high-speed gear, a rear output flange, a low-speed gear, an output shaft and a front output flange, the high-speed gear and the low-speed gear are mounted on the output shaft through sliding bearings, the output shaft is fixed on the lower part of the box body through bearings at two ends, the rear output flange is mounted at the left end of the output shaft, the front output flange is mounted at the right end of the output shaft, and the parking brake is mounted on the front output flange; the input shaft gear is meshed with the first intermediate shaft gear, the first intermediate shaft gear is meshed with the high-speed gear, and the second intermediate shaft gear is meshed with the low-speed gear; the small ends of the high-speed gear and the low-speed gear are provided with gear shifting external teeth, the middle part of the output shaft is provided with gear shifting external teeth, and the gear shifting external teeth on the high-speed gear, the gear shifting external teeth on the low-speed gear and the gear shifting external teeth on the output shaft are the same in size and number; the middle part of the output shaft is provided with a gear shifting gear sleeve, the inner ring of the gear shifting gear sleeve is provided with gear shifting inner teeth, the outer ring of the gear shifting gear sleeve is provided with a ring groove, the gear shifting inner teeth of the gear shifting gear sleeve are meshed with the gear shifting outer teeth on the output shaft, and the widths of the gear shifting inner teeth and the gear shifting outer teeth are the; and a shifting fork on the shifting fork mechanism is inserted into the annular groove of the shifting gear sleeve, so that the gearbox assembly forms two gears to realize two-stage speed reduction.
2. The fixed-shaft gearbox assembly of the new energy engineering machinery as claimed in claim 1, wherein: the speed measuring gear is arranged on the output shaft, and the shifting fork gear shifting mechanism is enabled to shift gears at a reasonable rotating speed through the electric control system so as to realize stable gear shifting of the gearbox assembly.
3. The fixed-shaft gearbox assembly of the new energy engineering machinery as claimed in claim 1, wherein: the bottom of box is installed the oil drain plug, is equipped with the powerful magnet that is arranged in adsorbing the iron powder in the fluid and impurity on the oil drain plug to ensure the fluid cleanliness.
4. The fixed-shaft gearbox assembly of the new energy engineering machinery as claimed in claim 1, wherein: the box body is provided with a liquid level meter which is positioned on the horizontal line of the output shaft, and an oil filling pipe is arranged below the liquid level meter, so that an operator can directly observe the condition of lubricating oil in the box, and the gearbox assembly can be conveniently maintained in daily life.
5. The fixed-shaft gearbox assembly of the new energy engineering machinery as claimed in claim 1, wherein: the upper end of box is equipped with the breather valve to avoid the gearbox assembly to lead to the intracavity pressure increase because of the oil temperature risees at the during operation, cause the problem of sealing washer oil leak, can also dispel certain heat simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410204.4A CN112413063A (en) | 2020-12-04 | 2020-12-04 | New forms of energy engineering machine tool dead axle formula gearbox assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011410204.4A CN112413063A (en) | 2020-12-04 | 2020-12-04 | New forms of energy engineering machine tool dead axle formula gearbox assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112413063A true CN112413063A (en) | 2021-02-26 |
Family
ID=74830406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011410204.4A Pending CN112413063A (en) | 2020-12-04 | 2020-12-04 | New forms of energy engineering machine tool dead axle formula gearbox assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112413063A (en) |
-
2020
- 2020-12-04 CN CN202011410204.4A patent/CN112413063A/en active Pending
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