CN210863358U - Clamp for friction wear testing machine - Google Patents
Clamp for friction wear testing machine Download PDFInfo
- Publication number
- CN210863358U CN210863358U CN201921614249.6U CN201921614249U CN210863358U CN 210863358 U CN210863358 U CN 210863358U CN 201921614249 U CN201921614249 U CN 201921614249U CN 210863358 U CN210863358 U CN 210863358U
- Authority
- CN
- China
- Prior art keywords
- testing machine
- positioning
- friction wear
- wear testing
- clamp
- 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
Abstract
The utility model discloses a friction and wear test machine anchor clamps, include: a clamp body; a positioning table; an adjusting seat; a sleeve; and (5) tightening the screw. The foundation the utility model discloses a friction and wear test machine anchor clamps are suitable for sample state and anchor clamps to install and remove relatively portably under the adjustment.
Description
Technical Field
The utility model relates to a friction and wear test machine anchor clamps specifically are sample anchor clamps down for friction and wear test machine.
Background
With the development of science and technology and industry, the micro-motion tribology test analysis technology is developed very rapidly. Many fretting tribology test instruments function more and more, and the simulation true operating mode also becomes more accurate. In the fretting friction wear testing machine, mechanical parts need to be made into samples, then the jigging friction samples are clamped by a clamp and fixed on a workbench, and then the fretting friction samples and a grinding piece are ground to simulate the real working condition of the parts, so that the fretting friction wear test of the parts is achieved. Traditional fine motion friction and wear test machine anchor clamps and reagent pond are a whole, and the snap-on is on the workstation, can't realize the rotation of sample, inconvenient maintenance change.
Taking MFT-50 type fretting wear testing machine as an example, the clamp adopted at present is usually screwed on the testing machine directly, and the size of the clamp is adapted to the specification of the testing machine and cannot be changed. In the testing machine, a fretting friction sample is directly clamped on a clamp and then fixed on the testing machine to be ground with a grinding piece. Because the testing machine does not have the functions of moving and rotating, the experimental procedure is complicated, the rotating angle cannot be guaranteed, the clamping precision of the fretting friction sample at each time cannot be guaranteed while the working hours and materials are wasted.
Chinese patent document CN109682704A discloses a low-temperature twisting fretting friction wear test device, in which a lower sample clamp clamps a lower sample through a vibration isolation workbench, and the lower sample clamp is directly mounted on a worm wheel for providing torque through flange connection. The way the lower sample holder is fixed determines that it cannot be adjusted for sample independent rotation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be suitable for adjustment down sample state and anchor clamps install and remove simple and convenient anchor clamps for friction wear test machine relatively.
An embodiment of the utility model provides a friction and wear test machine anchor clamps, include:
the fixture body comprises a pair of arch parts, the arch parts are columns with arch-shaped bottom surfaces, the side surfaces of the two arch parts determined by chords are opposite and are connected through bolts or screws to form the fixture body, the upper bottom of the fixture body is provided with a groove, and the groove is a lower sample positioning groove;
the upper surface of the positioning table is provided with a positioning pool, and the clamp body is fixed in the positioning pool;
the adjusting seat is fixed on the adjusting seat or integrated with the positioning seat, and the lower end of the adjusting seat is provided with a cylindrical head or a ball head;
the sleeve is used for installing the clamp for the friction wear testing machine on the testing machine and provides a cavity for positioning the cylindrical head or the ball head, so that the adjusting seat has one degree of freedom or three degrees of freedom; a fastening screw hole is formed in the position, corresponding to the cavity, of the sleeve;
and the set screw is matched with the set screw hole so as to be used for adjusting the locking of the seat on the sleeve.
Optionally, the central angle of the arcuate portion is 177 degrees or less and 173 degrees or more.
Optionally, an assembly table is processed at one end or two ends of the chord direction of the arch part, and an assembly table surface of the assembly table is parallel to the side surface determined by the chord;
the assembly table is provided with a light hole in the normal direction of the assembly table surface;
the part of the other arc part which is aligned with the unthreaded hole is provided with a threaded hole;
providing an assembly screw matched with the screw hole through the unthreaded hole so as to connect the two arch parts into a whole;
if the arch part only has one assembling table, the ends of the assembling tables of the two arch parts in the chord direction are different.
Optionally, the sample positioning slot is a circular slot.
Optionally, the positioning table and the adjusting seat are in flange connection.
Optionally, an adjusting shim is disposed between the positioning table and the adjusting seat.
Optionally, the positioning pool is a blind hole with a counter bore;
the fixture body is positioned in the blind hole, and the upper bottom of the fixture body is coplanar with the bottom of the counter bore.
Optionally, a plurality of compression screw holes are formed in the bottom of the counter bore;
and providing a pressing sheet, wherein the pressing sheet is fixed on the positioning table through the matching of a compression screw and a compression screw hole, and the pressing sheet extends to the upper bottom of the clamp body and avoids the groove to fix the clamp body on the positioning table.
Optionally, the number of compression screw holes is two.
Optionally, a pointer or a pointer identifier is arranged on the adjusting seat;
and a scale is arranged on the circumference of the sleeve.
The embodiment of the utility model provides an in, be used for installing the specific location platform of anchor clamps and pass through the adjustment seat and install on the sleeve, wherein the sleeve is the seat portion of friction wear test machine anchor clamps installation on the testing machine. The lower end of the adjusting seat is provided with a cylindrical head or a ball head, and the sleeve is provided with a cavity. If the lower extreme of adjustment seat is the cylinder head, the chamber is corresponding for the cylinder chamber, and the cylinder head forms the cylinder hinge with the cooperation of cylinder chamber, has a rotational degree of freedom, and if for the bulb, the chamber is the ball socket, and the bulb forms the ball hinge with the ball socket cooperation, has three rotational degree of freedom. The sleeve is provided with a fastening screw hole corresponding to the cavity for locking the cylindrical hinge or the ball hinge. After a friction stage, loosen the holding screw hole, rotate the sample position that the adjustment seat corresponded to next friction stage, then through holding screw locking cylinder hinge or ball hinge, it is convenient relatively to adjust. The utility model discloses an in the embodiment, the simple dismantlement, easy dismounting of fastener are all relied on in the internal lower sample dismouting of anchor clamps to the specific dismouting of anchor clamps, location.
Drawings
Fig. 1 is a schematic perspective view of a jig for a friction wear testing machine in an embodiment.
FIG. 2 is a schematic front view of a jig for a friction and wear testing machine according to an embodiment.
Fig. 3 is a sectional view a-a of fig. 2.
FIG. 4 is a schematic top view of an exemplary positioning stage.
Fig. 5 is a schematic top view of the positioning state of the clamp body in the positioning table in one embodiment.
FIG. 6 is a schematic top view of a pair of clamps in an engaged state according to an embodiment.
FIG. 7 is a right side view of the fixture body in an embodiment.
Fig. 8 is a sectional view B-B of fig. 7.
In the figure: 1. the fixture comprises a fastening screw hole, 2. a sleeve, 3. a ball head, 4. a ball rod, 5. a flange, 7. an adjusting gasket, 8. a positioning table and 9. a fixture body.
21. And cavity, 22, stop groove.
81. Counterbore, 82, connecting screw hole, 83, pressing screw hole, 84, blind hole.
91. The groove, 92 assembly table, 93 abdicating groove, 94 light hole, 95 silk hole.
Detailed Description
The embodiment of the utility model provides an in, the friction and wear test machine anchor clamps that provide are used for the location and the clamping of sample down, and it is a structure from top to bottom on the whole to for last sample, it is located below on the whole.
The friction wear testing machine clamp provided in the embodiment comprises a clamp body 9, a positioning table 8 and a sleeve 2, wherein the sleeve 2 is equivalent to a seat part and used for installing the friction wear testing machine clamp on a testing machine.
The sleeve 2 is provided with two stop grooves 22 for stopping the sleeve 2 when the adjusting seat is rotated, and can also be used for assembling the sleeve 2 on a testing machine.
Wherein, the positioning table 8 and the sleeve 2 are not an integral structure and can be mutually detached. Meanwhile, the sleeve 2 bears the positioning table 8, the sleeve 2 is arranged below the positioning table 8 and has constraint in the horizontal direction, and the positioning table 8 only has rotational freedom. Because the sleeve 2 needs to bear the positioning table 8, the degree of freedom of the sleeve in the vertical direction is restrained downwards, the sleeve is a mouth part for inserting the ball head 3 upwards, and the sleeve does not need to be restrained upwards, so that the positioning table 8 with different specifications can be replaced, and the adaptability of samples under different conditions is realized.
The lower sample of the frictional wear is substantially an oblate structure, specifically, a circular shape in a plan view, and a structure having a thick middle and thin sides in a front view (horizontal projection). In some friction wear testing machines, the specimen used is circular in plan view and substantially rectangular in front view.
As can be seen in fig. 1, 5 and 6, the structure for positioning the lower sample is a groove 91 shown in the figure and located at the upper bottom of the clamp body 9, and the groove 91 is referred to as a sample positioning groove.
The fixture body 9 is an assembly which is assembled into an assembly and has a substantially axisymmetric structure, and the whole fixture body has a substantially cylindrical structure.
Each clamp body 9 includes a pair of arch portions, the arch portion is a geometric body enclosed by a chord and an arc in geometry, and in the embodiment of the present invention, a column shape with the arch portion as a base is referred to as an arch portion. The column shape is preferably a right cylinder, i.e. the upper and lower bottoms are the same.
As can be seen in fig. 7 and 8, the parts for connecting the two arcuate parts are mainly the light hole 94 and the threaded hole 95 shown in the figure, which are adapted to fit the screw connection, the round test piece is placed in the groove, and the round test piece is clamped in the groove by the pretension of the fitting screw.
The grooves are equivalent to circular grooves, but the lower sample does not have complete consistency between individuals, and thus the "circle" of the grooves is determined from the lower sample based more on clamping the lower sample. The clamp enables the lower sample to be reliably positioned in the groove, and the clamping of the lower sample is relatively simple.
Regarding the positioning table 8, the structure for carrying the aforementioned fixture body 9 is a positioning pool machined on the upper surface of the positioning table 8, such as the blind hole 84 and the counterbore 81 shown in fig. 4, and the fixture body 9 is received in the positioning pool and then fixed. In the test process, the positioning tank needs to be filled with a test solution, so that the capacity of the positioning tank needs to be larger than the volume of the clamp body 9 and the lower sample, and the sealing problem of a fixing structure for fixing the clamp body 9 needs to be considered.
In the construction shown in fig. 4 and 5, a compression screw hole 83 is provided for fixing the clamp body 9 in the axial direction of the clamp body 9, in which case the sealing problem of the positioning cell does not have to be taken into account.
In some embodiments, the clamp body 9 may also be locked using a lateral locking structure, for example a set screw similar to the set screw hole 1 in fig. 1, locking the clamp body using a set screw. In this case, the sealing of the positioning reservoir must be taken into account. Therefore, if the lateral thread locking is adapted, the thread should be a pipe thread.
Further, a sealant may be applied to the pipe threads.
In some embodiments, the pipe threads may also be fitted with a seal counterbore, where a sealing gasket is provided.
The adjustment seat may constitute a seat portion of the positioning table 8, or may be a structure separate from the positioning table 8, and the adjustment seat is used to adjust the rotation angle of the lower sample in the horizontal plane.
The fitting of the lower sample can be achieved by replacing the assembly formed by the adjustment base and the positioning stage 8 or replacing the positioning stage 8 itself, regardless of whether the adjustment base and the positioning stage 8 are separate bodies.
Further, the lower end of the adjustment seat has a cylindrical head or a ball head 3, and in the structure shown in fig. 1, the adjustment seat has a flange 5 at the upper end and a ball head 3 at the lower end, and the flange and the ball head are connected by a ball rod 4. The ball rod 4 and the ball head 3 can be rod pieces integrally, so that a hinge shaft in the cylindrical hinge is formed.
In the embodiment of the present invention, since the aforementioned ball hinge and the cylindrical hinge are not structures with large motion amount and frequent motion, the ball hinge and the cylindrical hinge only need to satisfy the motion, and the friction performance of the motion interface does not need to be considered sufficiently.
In an embodiment of the invention, a cylindrical hinge structure is preferred.
Correspondingly, a sleeve 2 is provided, and the sleeve 2 is used as a seat part of the clamp for the friction and wear tester on the tester as described above, and is used for mounting the clamp for the friction and wear tester on the tester; on the other hand, the sleeve 2 and the ball head 3 or the cylindrical head are matched to form a ball hinge or a cylindrical hinge.
The sleeve 2 accordingly provides a cavity for the positioning of said cylinder or ball head, thus forming the aforementioned cylinder or ball joint, and accordingly the adjustment seat has one degree of freedom of rotation when forming the cylinder joint and three degrees of freedom of rotation when forming the ball joint.
The cylindrical hinge can only adjust the rotation amount around the axis of the cylindrical hinge, and the three degrees of freedom are similar to universal adjustment, so that the cylindrical hinge is suitable for different test conditions.
Furthermore, a set screw hole 1 is formed in the sleeve 2 at a position corresponding to the cavity, and a set screw is provided to be engaged with the set screw hole 1, so that the set seat adjusted in position is locked by the set screw.
Regarding the universal adjustment of the ball joint, the rotation amount of the ball joint around the axis of the club 4 is not limited, and the other two rotational degrees of freedom can be restricted according to the depth of the sleeve 2, and the deeper the ball head 3 is inserted, the smaller the maximum rotation angle of the other two rotational degrees of freedom.
It is further emphasized that in embodiments of the present invention, a cylindrical hinge is preferred.
As described above, the lower sample is a circular sample, but the roundness is not always perfect due to the limitation of the manufacturing accuracy. Furthermore, in the embodiment of the present invention, two bow-shaped portions are used to clamp down a sample, similarly to forming a connection based on an interference fit (interference fit is also called interference connection), if the central angle of the bow-shaped portion is 180 degrees, the bow-shaped portion cannot effectively clamp down the sample due to a manufacturing error.
Therefore, in a preferred embodiment, the central angle of the arch part should be less than 180 degrees, and considering the manufacturing error of the lower sample as a whole, the central angle of the arch part should not be more than 177 degrees, under which condition, the replaceability of the lower sample can be basically satisfied.
The recess 91 corresponds lower sample and forms better support relatively, and when the central angle of bow-shaped portion was great simultaneously, do benefit to and form better connection, and the connecting piece can more effectively avoid recess 91, therefore, the central angle of bow-shaped portion suitable more than or equal to 173 degrees.
In the configuration shown in fig. 6, there is one notch on each of the two arcuate portions, and in some embodiments, there may be only one notch on each arcuate portion, or two notches on each arcuate portion.
The aforementioned notch is referred to as an assembly stand 92, and the notch constitutes an avoiding groove 93 in the drawing, and the avoiding groove 93 provides an operation space for assembling the screw. The mounting table 92 is a table with a gap parallel to the side defined by the chord and the axial direction of the mounting screw hole forms the normal to the table.
Further, the mounting table 92 is provided with a light hole 94 in the normal direction of the mounting table, and a screw hole 95 is provided at the other arcuate portion aligned with the light hole 94.
Further, a fitting screw is provided which is fitted with the screw hole 95 via the unthreaded hole 94 to connect the two arcuate portions as one body.
If the arcuate portion has only one mounting base 92, the mounting bases 92 of the two arcuate portions are different in chord direction.
With respect to the groove 91, which is a circular groove as understood in the foregoing description, it is understood that the term mechanical structure in the field of machinery is not limited in a geometric sense, such as a hexagonal head bolt, the head of which is substantially hexagonal and the base corners of which are all rounded. Thus, with respect to the description of a circular groove, it is essential that its body has a circular profile.
Ideally, the diameter of the circular contour of the recess 91, i.e., the sample positioning groove, should be equal to the diameter of the sample. Obviously, the actual workpiece cannot be in an ideal state, but the range of the circular slot containing radiation cannot be misunderstood.
In the structure shown in fig. 1, the positioning table 8 and the adjusting seat are connected by flanges for convenient replacement. Suitably, as shown in fig. 1, 4 and 5, four connecting screw holes 82 are provided on the positioning table 8. Suitably, the flange 5 is also provided with screw holes in alignment.
In some embodiments, an adjusting shim 7 is disposed between the positioning table 8 and the adjusting seat to adjust the supporting height of the fixture body 9 according to different experimental conditions.
In a preferred embodiment, as shown in fig. 4, the positioning reservoir is a blind hole 84 provided with a counterbore 81, wherein the blind hole 84 is used for positioning the clamp body 9, more specifically, the clamp body 9 is positioned in the blind hole.
In some embodiments, the upper bottom of the clamp body 9 is coplanar with the bottom of the counterbore 81 to facilitate the securing of the clamp body 9.
Regarding the fixation of the clamp body 9, as mentioned above, a compression screw in the hole bottom normal direction of the counterbore 81 may be used for fixation, and a fixation similar to the fixation of the set screw hole 1 shown in fig. 1 may also be used, which is not described herein again.
In the structure shown in fig. 4, two pressing screw holes 83 are formed in a counter bore 81 of the positioning table 8, and the clamp body 9 is pressed at a blind hole 84 by a pressing sheet matched with the counter bore, wherein the pressing sheet can be partially pressed on the upper surface of the clamp body 9, and partially pressed on the hole bottom of the counter bore 81.
The sheeting needs to avoid the grooves 91 to avoid interference with the motion of the abrading article.
In order to facilitate manual adjustment, a pointer or a pointer mark is arranged on the adjusting seat;
a scale is arranged on the circumference of the sleeve 2.
Claims (10)
1. The utility model provides a friction wear test machine anchor clamps which characterized in that includes:
the fixture body comprises a pair of arch parts, the arch parts are columns with arch-shaped bottom surfaces, the side surfaces of the two arch parts determined by chords are opposite and are connected through bolts or screws to form the fixture body, the upper bottom of the fixture body is provided with a groove, and the groove is a lower sample positioning groove;
the upper surface of the positioning table is provided with a positioning pool, and the clamp body is fixed in the positioning pool;
the adjusting seat is fixed on the adjusting seat or integrated with the positioning seat, and the lower end of the adjusting seat is provided with a cylindrical head or a ball head;
the sleeve is used for installing the clamp for the friction wear testing machine on the testing machine and provides a cavity for positioning the cylindrical head or the ball head, so that the adjusting seat has one degree of freedom or three degrees of freedom; a fastening screw hole is formed in the position, corresponding to the cavity, of the sleeve;
and the set screw is matched with the set screw hole so as to be used for adjusting the locking of the seat on the sleeve.
2. The jig for a friction wear testing machine according to claim 1, wherein a central angle of the arcuate portion is 177 degrees or less and 173 degrees or more.
3. The jig for a friction wear testing machine according to claim 2, wherein an assembly table is formed at one end or both ends of the arcuate portion in the chord direction, and an assembly table surface of the assembly table is parallel to a side surface defined by the chord;
the assembly table is provided with a light hole in the normal direction of the assembly table surface;
the part of the other arc part which is aligned with the unthreaded hole is provided with a threaded hole;
providing an assembly screw matched with the screw hole through the unthreaded hole so as to connect the two arch parts into a whole;
if the arch part only has one assembling table, the ends of the assembling tables of the two arch parts in the chord direction are different.
4. The jig for a friction wear testing machine according to any one of claims 1 to 3, wherein the sample positioning groove is a circular groove.
5. The jig for a friction wear testing machine according to claim 1, wherein the positioning table is flange-connected to the adjustment base.
6. The jig for a friction wear testing machine according to claim 5, wherein an adjustment shim is provided between the positioning table and the adjustment seat.
7. The clamp for the friction wear testing machine according to claim 1, 5 or 6, wherein the positioning pool is a blind hole with a counter bore;
the fixture body is positioned in the blind hole, and the upper bottom of the fixture body is coplanar with the bottom of the counter bore.
8. The clamp for the friction wear testing machine as recited in claim 7, wherein the counterbore bottom is provided with a plurality of compression screw holes;
and providing a pressing sheet, wherein the pressing sheet is fixed on the positioning table through the matching of a compression screw and a compression screw hole, and the pressing sheet extends to the upper bottom of the clamp body and avoids the groove to fix the clamp body on the positioning table.
9. The jig for a friction wear testing machine according to claim 8, characterized in that the number of the compression screw holes is two.
10. The jig for a friction wear testing machine according to claim 1, wherein a pointer or a pointer mark is provided on the adjustment seat;
and a scale is arranged on the circumference of the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921614249.6U CN210863358U (en) | 2019-09-26 | 2019-09-26 | Clamp for friction wear testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921614249.6U CN210863358U (en) | 2019-09-26 | 2019-09-26 | Clamp for friction wear testing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210863358U true CN210863358U (en) | 2020-06-26 |
Family
ID=71306174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921614249.6U Expired - Fee Related CN210863358U (en) | 2019-09-26 | 2019-09-26 | Clamp for friction wear testing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210863358U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595878A (en) * | 2019-09-26 | 2019-12-20 | 济南大学 | Clamp for friction wear testing machine |
| CN113155661A (en) * | 2021-05-08 | 2021-07-23 | 河南科技大学 | Reciprocating type friction and wear test and use fixture device and reciprocating type friction and wear test machine |
-
2019
- 2019-09-26 CN CN201921614249.6U patent/CN210863358U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595878A (en) * | 2019-09-26 | 2019-12-20 | 济南大学 | Clamp for friction wear testing machine |
| CN113155661A (en) * | 2021-05-08 | 2021-07-23 | 河南科技大学 | Reciprocating type friction and wear test and use fixture device and reciprocating type friction and wear test machine |
| CN113155661B (en) * | 2021-05-08 | 2024-02-27 | 河南科技大学 | Clamp device for reciprocating frictional wear test and reciprocating frictional wear testing machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210863358U (en) | Clamp for friction wear testing machine | |
| CN104297883B (en) | Four-degree-of-freedom trimming rack | |
| CN110595878A (en) | Clamp for friction wear testing machine | |
| CN109187176A (en) | A kind of test fixture and centering clamping method of centering clamping plate tensile sample | |
| CN111716127B (en) | Multi-degree-of-freedom clamp | |
| CN201803821U (en) | Fixture for measuring residual stress of vane | |
| CN109500528A (en) | A kind of welder of steel construction spherical reticulated shells triangular framing | |
| CN211072397U (en) | Height-adjustable cushion block | |
| CN212806802U (en) | Small-range comparator for measuring space size of precise spherical surface | |
| CN109946152B (en) | Cutter cutting edge abrasion detection clamp | |
| CN114789353B (en) | Ear ring joint slot milling clamp and slot milling method | |
| CN110216511B (en) | Correcting tool and correcting method for multi-angle drill bit positioning bolt of main shaft | |
| CN114029097A (en) | Flat test piece measuring clamp for high-low temperature environment test chamber and test method thereof | |
| CN209542279U (en) | A kind of sample clamp and friction test device | |
| CN112414835A (en) | Test fixture for human tooth/implant compression fatigue test | |
| CN112720381A (en) | Sample clamp for testing X-ray residual stress | |
| US20150260624A1 (en) | Snap grip indenter mount used on a hardness tester | |
| CN219511447U (en) | Angle measuring tool for assembling turbocharger assembly | |
| CN113655463B (en) | A quick assembly disassembly device and laser radar for laser radar | |
| CN205537562U (en) | Bell housing basin mouth, lateral runout detection device | |
| CN218904344U (en) | Four-axis finish machining cylinder seat fixture device | |
| CN214583164U (en) | Coaxiality measuring instrument | |
| CN109108733B (en) | Circle center correcting device for machining concentric holes | |
| CN113579852B (en) | Auxiliary measuring device for automatic processing of lugs and using method thereof | |
| CN220705819U (en) | Rocket engine test bed adjusting device capable of being adjusted in three directions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200626 Termination date: 20210926 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |