CN112248723A - Tire burst emergency device and rim assembly - Google Patents
Tire burst emergency device and rim assembly Download PDFInfo
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- CN112248723A CN112248723A CN202011185914.1A CN202011185914A CN112248723A CN 112248723 A CN112248723 A CN 112248723A CN 202011185914 A CN202011185914 A CN 202011185914A CN 112248723 A CN112248723 A CN 112248723A
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- tire
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- mounting groove
- emergency device
- rubber strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
- B60C17/04—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency
- B60C17/041—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor utilising additional non-inflatable supports which become load-supporting in emergency characterised by coupling or locking means between rim and support
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The invention discloses a tire burst emergency device and a rim assembly, wherein the tire burst emergency device comprises a rim body, a supporting rubber strip and a fixing structure, wherein an annular mounting groove is formed in the outer surface of the rim body and is used for mounting a tire; the supporting rubber strip is wound in the annular mounting groove and arranged along the rotating axis direction of the rim body in a manner of filling the annular mounting groove, the supporting rubber strip is provided with a first end and a second end which are opposite, and the first end is connected with the second end so that the supporting rubber strip is matched with the annular mounting groove; the fixing structure is used for fixing the first end and the second end to the annular mounting groove. When a tire burst occurs in the running process of a vehicle, the tire skin of the tire is prevented from being separated from the rim body due to the fact that one end of the tire skin is sunk into the annular mounting groove and deviates, the diameter of the tire skin of the tire is always smaller than the diameter of the retainer ring on the outer surface of the rim body, and the tire skin of the tire after the tire burst is prevented from being separated.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to a tire burst emergency device and a rim assembly.
Background
When the vehicle is used, the tire burst can be caused when the vehicle runs under the condition of air shortage or breakage, and once the tire bursts, the tire can slide out of the rim, so that the vehicle is in danger of being deviated and turned on one side. Therefore, the rim is generally provided with a tire burst emergency safety device, which can play a role of supporting the tire after the vehicle bursts, prevent the tire from deviating, continue to run for a certain distance by relying on the flat tire, and keep the vehicle safe as much as possible.
The conventional tire burst emergency device generally adopts a rigid support ring structure, is complex in structure, needs professional tools and professionals to install and disassemble, increases the assembling time and cost of a tire production line, and is high in maintenance cost.
Disclosure of Invention
The invention mainly aims to provide a tire burst emergency device and a rim assembly, and aims to solve the problems of high difficulty in mounting and dismounting and high maintenance cost of the conventional tire burst emergency device.
In order to achieve the above object, the present invention provides an emergency device for tire burst, comprising:
a rim body, an outer surface of which is used for mounting a tire, the outer surface of which is formed with an annular mounting groove;
the supporting rubber strip is wound in the annular mounting groove and provided with a first end and a second end which are opposite, and the first end is connected with the second end so that the supporting rubber strip is matched with the annular mounting groove; and the number of the first and second groups,
a securing structure to secure the first end and the second end to the annular mounting groove.
Optionally, the first end and the second end are connected by an overlapping bevel.
Optionally, a first positioning straight section and a first inclined section are sequentially formed at the first end along the length direction of the supporting rubber strip, the first positioning straight section extends along the radial direction of the annular mounting groove, and the first inclined section is arranged towards the rim body;
a second positioning straight section and a second inclined section are correspondingly arranged at the second end along the length direction of the supporting rubber strip, the second positioning straight section extends along the radial direction, and the second inclined section deviates from the rim body;
the first inclined surface section and the second inclined surface section are in lap joint and are matched, and the opposite side ends of the first inclined surface section and the second inclined surface section are respectively abutted against the second positioning straight section and the second positioning straight section.
Optionally, the bottom wall surface of the annular mounting groove is provided with a mounting hole extending along the radial direction of the annular mounting groove;
the first end and the second end are at least partially overlapped, a first through hole which extends along the radial direction and is arranged corresponding to the mounting hole is formed in the first end, and a second through hole is correspondingly formed in the second end;
the fixing structure comprises a fixing rod, and the fixing rod sequentially penetrates through the first through hole and the second through hole to be fixedly installed in the installation hole.
Optionally, a part of one end of the fixing rod, which extends out of the mounting hole, is provided with an external thread;
the fixing structure further comprises a fixing nut, and the fixing nut is fixed with the external thread through threads.
Optionally, one end of the fixing rod, which is far away from the mounting hole, is provided with an annular limiting protrusion, and the annular limiting protrusion abuts against the supporting rubber strip.
Optionally, the fixing rod is a valve; alternatively, the first and second electrodes may be,
the side surface of the fixing rod facing the mounting hole is provided with a vent hole extending along the radial direction, and the vent hole is used for inflating the tire.
Optionally, a threading hole communicated with the vent hole is formed in the outer surface of the side end, facing the mounting hole, of the fixing rod;
the fixed knot constructs still includes the lead wire, the one end of lead wire is worn to locate in the threading hole, the other end passes in proper order the second through-hole with the mounting hole is in order to stretch into to in the inner circle of rim body.
Optionally, the supporting rubber strip is at least partially adhered in the annular mounting groove.
The invention also provides a rim assembly, which comprises the tire burst emergency device, wherein the tire burst emergency device comprises:
a rim body, an outer surface of which is formed with an annular mounting groove for mounting a tire;
the supporting rubber strip is wound in the annular mounting groove, the supporting rubber is used for pressing at least part of the inner ring of the tire into the annular mounting groove, the supporting rubber strip is provided with a first end and a second end which are opposite, and the first end is connected with the second end so that the supporting rubber strip is matched with the annular mounting groove; and the number of the first and second groups,
a securing structure to secure the first end and the second end to the annular mounting groove.
In the technical scheme of the invention, the outer surface of the rim body is used for mounting a tire, the supporting rubber strip is wound in the annular mounting groove and is arranged along the direction of the rotation axis of the rim body in a manner of filling the annular mounting groove, the supporting rubber strip is fixedly mounted in the annular mounting groove under the action of the fixing structure, when a tire burst condition occurs in the running process of a vehicle, gas in the tire is lost, one end of a tire skin retracts from the edge of the outer surface of the rim body towards the direction of the annular mounting groove, at the moment, the supporting rubber strip has the action of ensuring that the tire skin of the tire cannot deviate from the rim body because one end of the tire skin is sunk into the annular mounting groove, the diameter of the tire skin of the tire is always smaller than the diameter of a check ring on the outer surface of the rim body, so that the tire cannot deviate from the rim body after the tire burst damage, the tire skin of the tire after the tire burst is still remained on the rim body, so that the vehicle can continue to run for a certain distance by relying on the flat tire as a deceleration buffer, the safety of the vehicle is kept as far as possible, the production operation efficiency is improved on the premise of meeting the reliability, and the system cost and the weight are reduced to a certain degree.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 schematic view of an embodiment of a tire burst emergency device provided by the present invention;
FIG. 2 is an exploded view of the support rubber strip and securing structure of FIG. 1 in combination;
FIG. 3 is a schematic cross-sectional view of the flat tire emergency device of FIG. 1;
figure 4 is a schematic perspective view of the rim body of figure 1;
fig. 5 is a perspective view of the fixing structure of fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Emergency device for |
222 | Second |
| 1 | |
2221 | Second through |
| 11 | |
3 | |
| 111 | |
31 | |
| 2 | |
311 | |
| 211 | First positioning |
312 | |
| 212 | First |
313 | Annular limiting |
| 2121 | First through |
32 | |
| 221 | Second positioning |
33 | Lead wire |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indication is involved in the embodiment of the present invention, the directional indication is only used for explaining the relative positional relationship, the motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment 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, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
When the vehicle is used, the tire burst can be caused when the vehicle runs under the condition of air shortage or breakage, and once the tire bursts, the tire can slide out of the rim, so that the vehicle is in danger of being deviated and turned on one side. For this reason, various tire burst emergency safety devices have been developed in the art, which are disposed on a rim, and can play a role of supporting a tire after a vehicle has burst, so as to prevent the tire from deviating, and continue to run for a certain distance depending on a flat tire, thereby keeping the safety of the vehicle as much as possible. However, the mounting and dismounting of the tire burst emergency device need trained professionals, and the mounting and dismounting process also needs professional tools, so that the tire burst emergency device is very difficult to operate in the daily tire repair and replacement process.
The conventional tire burst emergency device adopts a rigid support ring structure, a rubber pad is distributed on a support ring to prevent the support ring from sliding in a rim, and finally the support ring is fixed in the rim by fastening bolts and nuts. According to the structure, after the tire walls on two sides of the tire are mounted on a rim, one tire wall is pressed again, then the tire burst emergency device is installed, the operation is complex, trained professionals are needed for operation, and professional tools are needed in the installation and disassembly processes. Under the large environment that the requirements for cost control, light weight of the whole automobile and convenience in maintenance of an automobile host factory are higher and higher, the tire burst emergency device adopting the structure has various disadvantages. On the one hand, the time and costs of assembly of the tyre production line are increased, and on the other hand the use of such rigid structural members also increases the weight of the vehicle.
In view of the above, the invention provides a tire burst emergency device, which is convenient to mount and dismount, improves the production operation efficiency and reduces the system cost and weight to a certain extent on the premise of satisfying the reliable mounting and fixing of the tire burst emergency device. Fig. 1 to 5 show an embodiment of a tire burst emergency device according to the present invention.
Referring to fig. 1 to 2, the tire burst emergency device 100 includes a rim body 1, a supporting rubber strip 2 and a fixing structure 3, wherein the outer surface of the rim body 1 is used for mounting a tire, and an annular mounting groove 11 is formed on the outer surface of the rim body 1; the supporting rubber strip 2 is wound in the annular mounting groove 11, the supporting rubber strip 2 is provided with a first end and a second end which are opposite, and the first end is connected with the second end so that the supporting rubber strip 2 is matched with the annular mounting groove 11; the fixing structure 3 is used for fixing the first end and the second end to the annular mounting groove 11.
In the technical scheme of the invention, the outer surface of the rim body 1 is used for mounting a tire, the supporting rubber strip 2 is wound in the annular mounting groove 11 and is arranged along the direction of the rotation axis of the rim body 1 to fill the annular mounting groove 11, under the action of the fixing structure 3, the supporting rubber strip 2 is fixedly mounted in the annular mounting groove 11, when a tire burst condition occurs in the running process of a vehicle, gas in the tire is lost, one end of a tire skin retracts from the edge of the outer surface of the rim body 1 towards the direction of the annular mounting groove 11, at the moment, the supporting rubber strip 2 acts to ensure that the tire skin of the tire cannot deviate from the rim body 1 because one end of the tire skin is sunk into the annular mounting groove 11 and is separated from the rim body 1, the diameter of the tire skin of the tire is always smaller than the diameter of a check ring on the outer surface of the rim body 1, so that the tire cannot separate from the rim body 1 after the, the tire skin after the tire burst is still remained on the rim body 1, so that the vehicle can continue to run for a certain distance by taking the tire burst as a deceleration buffer, and the safety of the vehicle is kept as much as possible. On the premise of meeting the reliability, the production operation efficiency is improved, and the system cost and the weight are reduced to a certain degree.
The invention is not limited to the connection mode of the first end and the second end, and in one embodiment, the first end and the second end are connected through an overlap inclined surface. The first end and the second end can abut against each other, the first end and the second end are partially overlapped, and the like, which are not described in detail herein, and the mode of the inclined plane overlapping is convenient for the attaching installation.
Further, along the length direction of the supporting rubber strip 2, a first positioning straight section 211 and a first inclined section 212 are sequentially formed at the first end, the first positioning straight section 211 extends along the radial direction of the annular mounting groove 11, and the first inclined section 212 is arranged towards the rim body 1; in the length direction of the supporting rubber strip 2, the second end is correspondingly provided with a second positioning straight section 221 and a second inclined section 222, the second positioning straight section 221 extends along the radial direction, and the second inclined section 222 is arranged away from the rim body 1; the first inclined surface section 212 and the second inclined surface section 222 are in lap joint, and opposite side ends of the first inclined surface section 212 and the second inclined surface section 222 are respectively abutted against the second positioning straight section 221 and the second positioning straight section 221. So set up, through first inclined plane section 212 with second inclined plane section 222 carries out the overlap joint cooperation, first location straight section 211 with second location straight section 221 carries out the location direction, works as first end with the second end with correspond second location straight section 221 with when first location straight section 211 offsets, then prove first end with the second end is laminated completely, when avoiding the inclined plane overlap joint, is difficult to confirm the overlap joint position, the condition of excessive assembly probably appears.
The fixing structure 3 may fix the first end, the second end and the hub body by means of sealing glue, and in an embodiment of the present invention, referring to fig. 3 to 4, a mounting hole 111 extending along a radial direction of the annular mounting groove 11 is formed in a bottom wall surface of the annular mounting groove 11; the first end and the second end are at least partially overlapped, the first end is provided with a first through hole 2121 which extends along the radial direction and is arranged corresponding to the mounting hole 111, and the second end is correspondingly provided with a second through hole 2221; the fixing structure 3 includes a fixing rod 31, and the fixing rod 31 sequentially passes through the first through hole 2121 and the second through hole 2221 to be fixedly mounted in the mounting hole 111. So set up simple structure, the assembly is convenient, saves installation time, and convenient to detach changes simultaneously support rubber strip 2.
In order to facilitate the fixing of the fixing rod 31 relative to the hub body, in this embodiment, a portion of one end of the fixing rod 31 extending out of the mounting hole 111 is provided with an external thread; the fixing structure 3 further comprises a fixing nut 32, and the fixing nut 32 is fixed with the external thread through threads. Simple structure, be convenient for realize fixed function.
Further, in this embodiment, an annular limiting protrusion 313 is disposed at an end of the fixing rod 31 far away from the mounting hole 111, and when the annular limiting protrusion 313 abuts against the supporting rubber strip 2, the fixing rod 31 is mounted in place, so that the mounting is facilitated, and meanwhile, the excessive assembly is prevented.
An air valve is generally arranged on a vehicle rim so as to inflate a tire, and in the embodiment, the fixing rod 31 is the air valve; so will aerify the inflating valve of function and dead lever 31 and close as an organic whole, integrate the design, change the assembly position of inflating valve to realize simultaneously fixedly support rubber strip 2 and the function of inflating, inflating valve key feature includes that bolt head, inflating valve installation screw thread, inflating valve cap installation screw thread, conical surface, air vent are inside to have the valve of filling and discharging, fills the valve of filling and discharging the same general valve of filling of valve characteristic.
In this embodiment, the advantage that the dead lever 31 is the inflating valve still lies in, is convenient for discern whether the emergency device 100 that blows out installs, and the inflating valve that has now only as the inflation effect generally sets up rim body 1 both sides, and the end of inflating of the inflating valve in this embodiment is located the inner circle of rim body 1 is different from conventional structure, accessible the mounted position of inflating valve is differentiated whether the emergency device 100 that blows out has been installed, need make the mark in addition after avoiding the installation of current structure, easy neglected loading.
Furthermore, in order to ensure the sealing performance of the assembly of the fixing rod 31 and prevent the air leakage of the tire, in this embodiment, sealing gaskets are respectively disposed between the annular limiting protrusion 313 and the supporting rubber strip 2, and between the fixing nut 32 and the rim body 1
Alternatively, the fixing rod 31 is formed with a vent hole 311 extending in the radial direction toward the side of the mounting hole 111, and the vent hole 311 is used for inflating the tire. The fixing rod 31 is provided with an air pumping function by machining.
The total length of the supporting rubber strip 2 is slightly shorter than the circumference of the annular mounting groove 11, so that the supporting rubber strip 2 cannot shake after being mounted. Therefore, the first end and the second end need to be pulled to reach the required mounting positions in the mounting process, and the outer surface of the fixed rod 31 facing the side end of the mounting hole 111 is provided with a threading hole 312 communicated with the vent hole 311; the fixing structure 3 further includes a lead 33, one end of the lead 33 penetrates through the threading hole 312, and the other end of the lead passes through the second through hole 2221 and the mounting hole 111 in sequence to extend into the inner ring of the rim body 1. Before installing the tire, the fixing rod 31 penetrates through the first through hole 2121, the second end is fixedly installed on the bottom wall surface of the annular installation groove 11, the second through hole 2221 corresponds to the installation hole 111, then the lead 33 penetrates through the threading hole 312, the lead 33 sequentially penetrates through the gasket, the second through hole 2221 and the installation hole 111, after the tire is installed, the lead 33 is pulled, the fixing rod 31 is guided to penetrate through the rim body 1, and finally the sealing gasket is installed and the fixing nut 32 is screwed down, so that the assembly can be completed.
If the fixing rod 31 is an air valve, the threading hole 312 is correspondingly formed on the air valve, which can be specifically referred to fig. 5. When the tire is disassembled, the inflating valve is firstly disassembled, the inflating valve is pushed to the bottom, the supporting rubber strip 2 is separated from the rim body 1, and then the tire is disassembled according to a common tire disassembling mode.
Further, in order not to affect the normal installation of the tire, the supporting rubber strip 2 is at least partially adhered in the annular installation groove 11. In this embodiment, only 1/3 of the supporting rubber strip 2 is adhered to the rim from the second end, which does not affect the normal installation of the tire and ensures the fixation of the second end.
It should be noted that, in this embodiment, the supporting rubber strip 2 is fixed by 3M glue, and the 3M glue has an excellent adhesion effect, an excellent waterproof performance, a good processability, and a good temperature resistance.
The supporting rubber strip 2 and the rim body 1 cannot slide relatively under the combined action of the 3M rubber and the fixing rod 31; the supporting rubber strip 2 is light in weight, the cross section can be made into various optional devices to match different rims, the anti-drop effect of the tire is improved, meanwhile, the tire wall does not need to be pressed to arrange the tire burst emergency device 100 during assembly, the assembly is simple, and a professional tool is not needed. The supporting rubber strip 2 is simple in structure, convenient for batch production and more excellent in overall vehicle cost.
In addition, the end of the second through hole 2221 where the fixing lever 31 is installed is provided with a guide slope to facilitate the penetration of the fixing lever 31.
The invention further provides a rim assembly, which comprises the tire burst emergency device 100, and the rim assembly comprises all the technical characteristics of the tire burst emergency device 100, so that the rim assembly also has the technical effects brought by all the technical characteristics, and the details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An emergency device for tire burst, comprising:
a rim body, an outer surface of which is used for mounting a tire, the outer surface of which is formed with an annular mounting groove;
the supporting rubber strip is wound in the annular mounting groove and provided with a first end and a second end which are opposite, and the first end is connected with the second end so that the supporting rubber strip is matched with the annular mounting groove; and the number of the first and second groups,
a securing structure to secure the first end and the second end to the annular mounting groove.
2. A flat tire emergency device as in claim 1 wherein said first end and said second end are joined by an overlapping ramp.
3. A tire burst emergency device according to claim 2, wherein the first end is sequentially formed with a first positioning straight section and a first inclined section along a length direction of the supporting rubber strip, the first positioning straight section extends in a radial direction of the annular mounting groove, and the first inclined section is disposed toward the rim body;
a second positioning straight section and a second inclined section are correspondingly arranged at the second end along the length direction of the supporting rubber strip, the second positioning straight section extends along the radial direction, and the second inclined section deviates from the rim body;
the first inclined surface section and the second inclined surface section are in lap joint and are matched, and the opposite side ends of the first inclined surface section and the second inclined surface section are respectively abutted against the second positioning straight section and the second positioning straight section.
4. A tire burst emergency device according to claim 1, wherein a bottom wall surface of the annular mounting groove is provided with a mounting hole extending in a radial direction of the annular mounting groove;
the first end and the second end are at least partially overlapped, a first through hole which extends along the radial direction and is arranged corresponding to the mounting hole is formed in the first end, and a second through hole is correspondingly formed in the second end;
the fixing structure comprises a fixing rod, and the fixing rod sequentially penetrates through the first through hole and the second through hole to be fixedly installed in the installation hole.
5. A tire burst emergency device as in claim 4, wherein the portion of the fixing rod extending out of the mounting hole at one end is externally threaded;
the fixing structure further comprises a fixing nut, and the fixing nut is fixed with the external thread through threads.
6. A tire burst emergency device as claimed in claim 4, wherein the end of the fixing rod away from the mounting hole is provided with an annular limiting protrusion, and the annular limiting protrusion abuts against the supporting rubber strip.
7. The emergency device for tire burst as claimed in claim 4, wherein the fixing rod is a valve; alternatively, the first and second electrodes may be,
the side surface of the fixing rod facing the mounting hole is provided with a vent hole extending along the radial direction, and the vent hole is used for inflating the tire.
8. The emergency device for tire burst as claimed in claim 7, wherein the fixing rod is formed with a threading hole communicating with the vent hole toward the outer surface of the side end of the mounting hole;
the fixed knot constructs still includes the lead wire, the one end of lead wire is worn to locate in the threading hole, the other end passes in proper order the second through-hole with the mounting hole is in order to stretch into to in the inner circle of rim body.
9. A flat tire emergency device as in claim 1 wherein said supporting rubber strip is at least partially adhered within the annular mounting groove.
10. A rim assembly comprising a flat tire emergency device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185914.1A CN112248723B (en) | 2020-10-28 | 2020-10-28 | Tire burst emergency device and rim assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011185914.1A CN112248723B (en) | 2020-10-28 | 2020-10-28 | Tire burst emergency device and rim assembly |
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| CN112248723A true CN112248723A (en) | 2021-01-22 |
| CN112248723B CN112248723B (en) | 2022-02-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113910841A (en) * | 2021-11-10 | 2022-01-11 | 北京爱尼机电有限公司 | Inner support body of hub |
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| CN113910841A (en) * | 2021-11-10 | 2022-01-11 | 北京爱尼机电有限公司 | Inner support body of hub |
| CN113910841B (en) * | 2021-11-10 | 2024-06-07 | 北京爱尼机电有限公司 | Inner support body of hub |
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| CN112248723B (en) | 2022-02-25 |
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