CN208420354U - Interference fit component fatigue experimental device based on rotoflector - Google Patents
Interference fit component fatigue experimental device based on rotoflector Download PDFInfo
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- CN208420354U CN208420354U CN201820838411.1U CN201820838411U CN208420354U CN 208420354 U CN208420354 U CN 208420354U CN 201820838411 U CN201820838411 U CN 201820838411U CN 208420354 U CN208420354 U CN 208420354U
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- Prior art keywords
- rotoflector
- hydraulic
- crossbeam
- interference fit
- axle box
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- 230000008878 coupling Effects 0.000 claims description 8
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 5
- 238000005452 bending Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 230000003137 locomotive effect Effects 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 8
- 230000033001 locomotion Effects 0.000 description 5
- 238000011068 loading method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010724 circulating oil Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 208000032370 Secondary transmission Diseases 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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Abstract
The utility model discloses a kind of interference fit component fatigue experimental device based on rotoflector, its device includes platform base, frequency control motor is fixedly installed on platform base, output shaft and retarder, main driving wheel and the brake disc of frequency control motor are successively sequentially connected；It is provided with rack on platform base, elevator and lateral register part are movably installed in rack.The utility model can rotary bending fatigue damage of the real simulation locomotive axle in the case where bearing complicated alternate load effect, obtain fatigue conditions of the wheel shaft under the effect of rotoflector load.
Description
Technical field
The utility model relates to fatigue test technology fields, and in particular to a kind of interference fit component based on rotoflector
Fatigue experimental device.
Background technique
Fatigue phenomenon is widely present in the fields such as space flight, aviation, machinery, electric power, traffic, it is the master of metal component fracture
Want one of form.Interference fit connection has many advantages, such as compact-sized, good to neutrality and impacts small, is widely used in transmitting and moves
Power and movement.But due to extraneous fatigue load, structure and the collective effect of displacement constraint, will certainly be generated between axis-hub
Non-compatible deformation so as to cause interference face Fretting Fatigue Damage.Largely industrial practice shows that, the fine motion between interference fit face is damaged
Wound significantly reduces the fatigue strength of components in interference fitness, causes huge economic and personal casualty loss, and axis is done sth. in advance
Fracture failure phenomenon is particularly acute.
By taking train wheel shaft Fretting Fatigue Damage as an example, according to its movement and the applying mode of fatigue load, referred to as rotate
It is bent Fretting Fatigue Damage, and the complexity fatigue that a variety of single-modes of process of its damage are coupled, as flexural fatigue, tension and compression are tired
Labor, torsional fatigue etc..Rotary bending fatigue as a kind of typical part failure form, occur mainly in both born in work it is curved
Square is born again in the shaft of torque, such as gear shaft, train axle, pulley shaft.
But the research in this field has focused largely on rotary bending fatigue or the torsion, bending of simplified axis at present
The research report of equal fretting fatigues mode, rotoflector Fretting Fatigue Damage is less.Fatigue rig is as a kind of important
Metal or the equipment of nonmetallic materials fatigue life and fatigue strength are tested, component rotary bending fatigue is exactly interference fitted and grinds
Study carefully the weak link of aspect, especially lack large scale, high speed, alternating load, with torque towards the cooperation of rail traffic wheel shaft
Fatigue tester and corresponding test method.
Utility model content
The utility model be directed to the prior art above-mentioned deficiency, provide one kind can real simulation locomotive axle bearing
Rotary bending fatigue damage under complicated alternate load effect obtains fatigue conditions of the wheel shaft under the effect of rotoflector load
Interference fit component fatigue experimental device based on rotoflector.
In order to solve the above technical problems, the utility model uses following technical proposal:
Provide a kind of interference fit component fatigue experimental device based on rotoflector comprising platform base, platform
Be fixedly installed with frequency control motor on pedestal, the output shaft of frequency control motor and retarder, main driving wheel and brake disc according to
Secondary transmission connection；It is provided with rack on platform base, elevator and lateral register part are movably installed in rack；
Rack includes hydraulic crossbeam, is equipped with electro-hydraulic servo actuator on the upside of hydraulic crossbeam, lateral register part is set to liquid
Crossbeam lower surface two sides are pressed, the output shaft of electro-hydraulic servo actuator is provided through on hydraulic crossbeam；
The lower end of elevator and axle box leading truck are hinged, and axle box leading truck lower end and counter drive shaft axle box are connected by guide rail
It connects, the two sides of axle box leading truck are flexibly connected with support base, and support base is set to above retarder by axle box pony sill, and axle box is led
Servo electric cylinders are movably installed on frame, the output shaft of servo electric cylinders is connect with counter drive shaft axle box end, counter drive shaft axle box
Counter drive shaft is inside installed, the rear end of counter drive shaft is connect with torque input unit；The front end of counter drive shaft and sample collet connect
It connects.
In above-mentioned technical proposal, it is preferred that lead to respectively between frequency control motor and retarder, between retarder and main driving wheel
Cross diaphragm coupling connection；Electromagnetic clutch is provided between brake disc and driving wheel.
In above-mentioned technical proposal, it is preferred that driving wheel is installed on platform base by the main shaft axle box of two sides.
In above-mentioned technical proposal, it is preferred that rack includes the frame side members being installed vertically on platform base, frame side members
Altogether there are four settings, it is symmetrically arranged in the two sides of platform base；Two frame side members tops of adjacent side are fixedly mounted
Organic frame upper beam.
In above-mentioned technical proposal, it is preferred that be fixedly installed with crane cross on rack upper beam, elevator is installed on lifting
On the downside of machine crossbeam.
In above-mentioned technical proposal, it is preferred that be fixedly installed motor cross in the frame side members of neighbouring lateral locating piece side
Beam is equipped with servo motor on motor crossbeam, and the output shaft of servo motor is connect by ball-screw mould group with hydraulic crossbeam, liquid
Pressure crossbeam is set on the downside of rack upper beam and is flexibly connected by guide rail with rack upper beam；It is vertically installed on hydraulic crossbeam electro-hydraulic
Servo actuator.
In above-mentioned technical proposal, it is preferred that electro-hydraulic servo actuator output shaft socket-connects with pressure sensor, electro-hydraulic servo
The lower end of actuator output shaft is flexibly connected with guide pad, and guide pad is flexibly connected by linear guides with lateral register part, is led
It is fixedly connected with the bearing seat to the lower end of block.
In above-mentioned technical proposal, it is preferred that torque input unit is brake, torque input unit lower end and brake seat
Connection, brake seat are set up in above diaphragm coupling.
It is provided by the utility model it is above-mentioned based on rotoflector interference fit component fatigue experimental device it is main beneficial
Effect is:
Interference fit component fatigue experimental device provided by the utility model based on rotoflector, passes through rack, principal and subordinate
The cooperation of the sample component of the structures such as driving wheel and interference fit realizes interference fit component rotary bending fatigue test device,
By the cooperation of frequency control motor, torque input unit, the combination to test parameters such as speed, load loading methods is realized,
The tired operating condition of most of interference fit component can be simulated.
During the test, active wheel speed is adjusted by frequency control motor, passes through electro-hydraulic servo actuator adjustment axis
It holds seat to apply load and export alternating load, by brake output torque, simulated locomotive wheel shaft is bearing complicated alternating load
The lower rotary bending fatigue damage of effect obtains fatigue life of the wheel shaft in the case where rotoflector load acts on, fatigue strength, surface
The data such as degree of impairment and fatigue crack growth rate；And above-mentioned component is all made of closed loop feedback control, ensure that test result
Accuracy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the interference fit component fatigue rig based on rotoflector.
Fig. 2 is the left view of testing equipment.
Fig. 3 is the right view of testing equipment.
Fig. 4 is the left view of lateral register part part.
Fig. 5 is the half sectional view of lateral register part part.
Fig. 6 is the cross-sectional view of sample shaft portion.
Fig. 7 is the cross-sectional view of counter drive shaft part.
Fig. 8 is the left view of counter drive shaft part.
Wherein, 1, platform base, 2, rack, 21, frame side members, 22, rack upper beam, 23, crane cross, 24, hydraulic
Crossbeam, 25, motor crossbeam, 251, servo motor, 3, frequency control motor, 31, diaphragm coupling, 32, retarder, 33, main biography
Moving axis axle box, 331, axle bed, 34, electromagnetic clutch, 35, brake disc, 4, electro-hydraulic servo actuator, 41, guide rail, 42, ball wire
Thick stick mould group, 43, lateral register part, 431, linear guides, 44, bearing block, 45, driving wheel, 46, pressure sensor, 47, guiding
Block, 5, elevator, 51, support base, 511, axle box leading truck, 512, dovetail guide, 513, dovetail slide block, 514, servo electric cylinders,
515, connecting rod, 52, axle box pedestal, 53, counter drive shaft axle box, 531, counter drive shaft, 54, torque input unit, 541, braking
Device seat, 542, worm and gear push rod, 6, sample axis, 61, sample wheel, 62, bearing, 63, sample collet.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing:
As shown in Figure 1, its structural schematic diagram for the interference fit component fatigue experimental device based on rotoflector.
The interference fit component fatigue experimental device based on rotoflector of the utility model includes platform base 1, platform
It is provided with dovetail groove on pedestal 1, and frequency control motor 3 is fixedly installed with by dovetail groove and bolt, frequency control motor 3
Output shaft is successively sequentially connected with retarder 32, main driving wheel 16 and brake disc 35；Between frequency control motor 3 and retarder 32,
It is connected respectively by diaphragm coupling 31 between retarder 32 and main driving wheel 16；Electricity is provided between brake disc 35 and driving wheel 45
Magnet clutch 34；Driving wheel 45 is installed on platform base 1 by the main shaft axle box 33 of two sides.
Retarder 32 using level-one angular gear input shaft under, output shaft upper installation method, and using circulation
The oily type of cooling；Main shaft and main driving wheel 16 are interference fitted, and drive sprocket axle is mounted on axle bed 331, main shaft axle journal
A pair of of cylinder roller bearing is respectively installed in position, to drive main driving wheel 16 to make rotating motion.
Rack is provided on platform base 1, rack includes the frame side members 21 being installed vertically on platform base 1, rack
Curb girder 21 is altogether there are four settings, is fixedly installed on the two sides of platform base 2 and symmetrical by bolt and dovetail groove respectively；
Organic frame upper beam 22 is fixedly mounted in two 21 tops of frame side members of adjacent side.
As shown in Fig. 2, Fig. 4 and Fig. 5, rack includes hydraulic crossbeam 24, and electro-hydraulic servo work is equipped on the upside of hydraulic crossbeam 24
Dynamic device 4, lateral register part 43 are set to hydraulic 24 lower surface two sides of crossbeam, and the top of lateral register part 43 is provided through electro-hydraulic
The output shaft of servo actuator 4；It is fixedly installed motor crossbeam 25 in the frame side members 21 of neighbouring lateral 43 side of locating piece, electricity
Servo motor 251 is installed, the output shaft of servo motor 251 passes through ball-screw mould group 42 and hydraulic crossbeam 24 on machine crossbeam 25
Connection, hydraulic crossbeam 24 are set to 22 downside of rack upper beam and are flexibly connected by guide rail 41 with rack upper beam 22；Hydraulic crossbeam
Electro-hydraulic servo actuator 4 is vertically installed on 24.
4 output shaft of electro-hydraulic servo actuator socket-connects with pressure sensor 46, the lower end of 4 output shaft of electro-hydraulic servo actuator
It is flexibly connected with guide pad 47, guide pad 47 is flexibly connected by linear guides 431 with lateral register part 43, so that guide pad 47
It can move up and down along 43 side wall of lateral register part；The lower end of guide pad 47 is fixedly connected with bearing block 44；Bearing block 44 with
Bearing on the sample axis 6 of interference fit component to be tested socket-connects.
As shown in Fig. 3, Fig. 7 and Fig. 8, crane cross 23 is fixedly installed on rack upper beam 22, elevator 5 is installed on liter
23 downside of drop machine crossbeam；The lower end of elevator 5 and axle box leading truck 511 are hinged, 511 lower end of axle box leading truck and counter drive shaft axis
Case 53 is connected by linear slide rail, and counter drive shaft axle box 53 is moved left and right with respect to axle box leading truck 511；Axle box is led
It is connect by dovetail guide 512 with 513 structure movement of dovetail slide block to the two sides of frame 511 with support base 51, so that axle box is oriented to
Frame 511 can slide up and down along support base 51.
Support base 51 is set up in 32 top of retarder by axle box pedestal 52, is movably installed with and watches on counter drive shaft axle box 53
Electric cylinders 514 are taken, the output shaft of servo electric cylinders 514 and 511 end of axle box leading truck are hinged, to drive counter drive shaft axle box 53 to move
It is dynamic, counter drive shaft 531 is installed, 531 axle journal position of counter drive shaft is respectively equipped with a taper roller in counter drive shaft axle box 53
Bearing；Tapered roller bearing uses circulating oil lubrication, recycles oil-in in the crankcase cover of two sides；The tapered roller bearing trip
Gap is adjusted with threaded adjustment ring.
As shown in fig. 6, the front end of counter drive shaft 531 is connect with sample collet 63, sample collet 63 and clip cover 25 cooperate,
Play the role of clamping sample axis 6 jointly.
The rear end of counter drive shaft 531 is connect with torque input unit 54；Torque input unit 54 is brake, using motor
Realize that 54 lower end of torque input unit is connect with brake seat 541 with the mode of frequency-variable controller cooperation, 541 frame of brake seat
Above diaphragm coupling 31, brake seat 541 is connect by worm and gear push rod 542 with platform base 1, so that brake
Seat 541 can cooperate the place height of counter drive shaft 531, be sequentially connected.
Here is the test method of the above-mentioned interference fit component fatigue experimental device based on rotoflector comprising as follows
Step:
S1, production sample wheel 61 and sample axis 6 to be tested, sample wheel 61 and the press fitting of sample axis 6 are connected, then tried
The axle journal position pressing bearing of sample axis 6.
Wheel shaft sample is designed and manufactures according to interference fit component actual condition, wheel shaft sample includes sample wheel 61 and sample
Axis 6 checks respectively for 6 machining accuracy of sample wheel 61 and sample axis, reaches and is pressed sample with tooling after requirement, then in sample axis 6
Axle journal position be pressed corresponding bearing.
S2, sample axis 6 is connect with sample collet 63, and sample collet 63 is installed on counter drive shaft 531, by watching
The position that electric cylinders 514 adjust counter drive shaft axle box 53 is taken, sample wheel 61 is made to be located at 45 top of driving wheel.
S3, the height that axle box leading truck 511 is adjusted by elevator 5, make sample wheel 61 be in contact with driving wheel.
S4, cooperated by servo motor 251 and ball-screw mould group 42, adjust the position of hydraulic crossbeam 24, make bearing block
44 socket-connect with the bearing on sample wheel 61.
It controls hydraulic crossbeam 24 to move left and right, by the mode that guide pad 47 and sample bearing block 44 cooperate, guarantee electro-hydraulic
4 loading force of servo actuator acts on bearing centre.
In actual operation, inner ring and outer ring can be selected herein can be right in the bearing for axially generating 2mm or so relative displacement
In the guarantee of preceding Internal and external cycle have 2mm relative shift, when hydraulic crossbeam 24 moves left and right so that guide pad 47 and 44 center of bearing block
The output shaft of control electro-hydraulic servo actuator 4 moves down when deviation is 1mm or so, realizes centering, and sample installs.
S5, starting frequency control motor 3, driving driving wheel 45 rotate, start to test and record tachometer value.
Start frequency control motor 3, driving driving wheel 45 rotates, and sets test speed, opens 32 circulation oil-cooling of retarder
But 53 bearing circulating oil lubrication system of system and counter drive shaft axle box, observing system operation conditions.
S6, pass through 4 moving shaft holder 44 of electro-hydraulic servo actuator, bending load is applied to sample wheel 61 and sample axis 6, and
Load value is recorded by pressure sensor 46.
Further, when carrying out load torsional moment test, torque input unit 54 and counter drive shaft 531 are connected by shaft coupling
It connects.
When needing to apply alternating load to sample wheel shaft, switching load loading method, setting alternating load Loaded contact analysis,
Amplitude, frequency, cycle-index information.
Specific embodiment of the present utility model is described above, in order to facilitate understanding by those skilled in the art
The utility model, it should be apparent that the utility model is not limited to the range of specific embodiment, to the common skill of the art
For art personnel, if various change the attached claims limit and determine the utility model spirit and scope in,
These variations are it will be apparent that all utilize the innovation and creation of the utility model design in the column of protection.
Claims (8)
1. a kind of interference fit component fatigue experimental device based on rotoflector, which is characterized in that including platform base (1),
It is fixedly installed with frequency control motor (3) on the platform base (1), the output shaft and retarder of frequency control motor (3)
(32), driving wheel (45) and brake disc (35) are successively sequentially connected；Rack (2), the machine are provided on the platform base (1)
Elevator (5) and lateral register part (43) are movably installed on frame (2)；
The rack (2) includes hydraulic crossbeam (24), is equipped with electro-hydraulic servo actuator (4) on the upside of hydraulic crossbeam (24), described
Lateral register part (43) is set to hydraulic crossbeam (24) lower surface two sides, and electro-hydraulic servo work is provided through on hydraulic crossbeam (24)
The output shaft of dynamic device (4)；
The lower end of the elevator (5) and axle box leading truck (511) hingedly, axle box leading truck (511) lower end and auxiliary driving
Axis axle box (53) is connected by guide rail, and the two sides of axle box leading truck (511) are flexibly connected with support base (51), and support base (51) is logical
It crosses axle box pedestal (52) to be set up in above retarder (32), is movably installed with servo electric cylinders on the axle box leading truck (511)
(514), the output shaft of servo electric cylinders (514) is connect with counter drive shaft axle box (53) end, in the counter drive shaft axle box (53)
It is equipped with counter drive shaft (531), the rear end of counter drive shaft (531) is connect with torque input unit (54)；The counter drive shaft
(531) front end is connect with sample collet (62).
2. the interference fit component fatigue experimental device according to claim 1 based on rotoflector, which is characterized in that institute
It states between frequency control motor (3) and retarder (32), pass through diaphragm shaft coupling between retarder (32) and driving wheel (45) respectively
Device (31) connection；Electromagnetic clutch (34) are provided between the brake disc (35) and driving wheel (45).
3. the interference fit component fatigue experimental device according to claim 2 based on rotoflector, which is characterized in that institute
Driving wheel (45) are stated to be installed on platform base (1) by the main shaft axle box (33) of two sides.
4. the interference fit component fatigue experimental device according to claim 1 based on rotoflector, which is characterized in that institute
Stating rack includes the frame side members (21) being installed vertically on platform base (1), and there are four the total settings of the frame side members (21),
It is symmetrically arranged in the two sides of platform base (1)；Organic frame is fixedly mounted in two frame side members (21) tops of adjacent side
Upper beam (22).
5. the interference fit component fatigue experimental device according to claim 4 based on rotoflector, which is characterized in that institute
It states and is fixedly installed on rack upper beam (22) crane cross (23), the elevator (5) is installed under crane cross (23)
Side.
6. the interference fit component fatigue experimental device according to claim 4 based on rotoflector, which is characterized in that adjacent
Nearside is fixedly installed motor crossbeam (25) in the frame side members (21) of locating piece (43) side, and motor crossbeam is installed on (25)
Having servo motor (251), the output shaft of servo motor (251) is connect by ball-screw mould group (42) with hydraulic crossbeam (24),
The hydraulic crossbeam (24) is set on the downside of rack upper beam (22) and is flexibly connected by guide rail (41) with rack upper beam (22)；Institute
It states and is vertically installed with electro-hydraulic servo actuator (4) on hydraulic crossbeam (24).
7. the interference fit component fatigue experimental device according to claim 1 or 6 based on rotoflector, feature exist
In, output shaft and the pressure sensor (46) of the electro-hydraulic servo actuator (4) socket-connect, electro-hydraulic servo actuator (4) it is defeated
The lower end of shaft is flexibly connected with guide pad (47), and the guide pad (47) passes through linear guides (431) and lateral register part
(43) it is flexibly connected, the lower end of the guide pad (47) is fixedly connected with bearing block (44).
8. the interference fit component fatigue experimental device according to claim 1 based on rotoflector, which is characterized in that institute
Stating torque input unit (54) is brake, and torque input unit (54) lower end is connect with brake seat (541), the brake
Seat (541) is set up in above diaphragm coupling (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820838411.1U CN208420354U (en) | 2018-05-31 | 2018-05-31 | Interference fit component fatigue experimental device based on rotoflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820838411.1U CN208420354U (en) | 2018-05-31 | 2018-05-31 | Interference fit component fatigue experimental device based on rotoflector |
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| Publication Number | Publication Date |
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| CN208420354U true CN208420354U (en) | 2019-01-22 |
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| CN201820838411.1U Withdrawn - After Issue CN208420354U (en) | 2018-05-31 | 2018-05-31 | Interference fit component fatigue experimental device based on rotoflector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562429A (en) * | 2018-05-31 | 2018-09-21 | 西南交通大学 | Interference fit component fatigue experimental device based on rotoflector and test method |
| CN110186701A (en) * | 2019-06-05 | 2019-08-30 | 燕山大学 | A kind of Railway wheelset interference fit face fretting damage test device |
| CN117260590A (en) * | 2023-11-21 | 2023-12-22 | 智道铁路设备有限公司 | Test bench connecting device |
| CN108562429B (en) * | 2018-05-31 | 2024-06-11 | 西南交通大学 | Interference fit part fatigue test device and method based on rotating bending |
-
2018
- 2018-05-31 CN CN201820838411.1U patent/CN208420354U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562429A (en) * | 2018-05-31 | 2018-09-21 | 西南交通大学 | Interference fit component fatigue experimental device based on rotoflector and test method |
| CN108562429B (en) * | 2018-05-31 | 2024-06-11 | 西南交通大学 | Interference fit part fatigue test device and method based on rotating bending |
| CN110186701A (en) * | 2019-06-05 | 2019-08-30 | 燕山大学 | A kind of Railway wheelset interference fit face fretting damage test device |
| CN110186701B (en) * | 2019-06-05 | 2020-05-22 | 燕山大学 | Device for testing fretting damage of interference fitting surface of train wheel set |
| CN117260590A (en) * | 2023-11-21 | 2023-12-22 | 智道铁路设备有限公司 | Test bench connecting device |
| CN117260590B (en) * | 2023-11-21 | 2024-01-30 | 智道铁路设备有限公司 | Test bench connecting device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190122 Effective date of abandoning: 20240611 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190122 Effective date of abandoning: 20240611 |