CN117869499A - Brake disc surface performance monitoring system and method - Google Patents
Brake disc surface performance monitoring system and method Download PDFInfo
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- CN117869499A CN117869499A CN202311692204.1A CN202311692204A CN117869499A CN 117869499 A CN117869499 A CN 117869499A CN 202311692204 A CN202311692204 A CN 202311692204A CN 117869499 A CN117869499 A CN 117869499A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 50
- 239000000523 sample Substances 0.000 claims abstract description 22
- 239000012530 fluid Substances 0.000 claims description 6
- 238000011897 real-time detection Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 7
- 238000011161 development Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
- F16D66/026—Apparatus for indicating wear using electrical detection or indication means indicating different degrees of lining wear
- F16D66/027—Sensors therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a system and a method for monitoring the surface performance of a brake disc, wherein the system comprises a driving module, a control module and a control module, wherein the driving module is used for driving the brake disc to rotate; the speed detection module is used for detecting the rotation speed of the brake disc; the torque detection module is used for detecting the torque born by the brake disc; the distance detection module comprises at least two detection probes which are oppositely arranged on two sides of the friction surface of the brake disc, and the detection probes are used for detecting the distance between the detection probes and the side surface of the brake disc; the hardness detection module is used for detecting the hardness of the surface of the brake disc; a brake caliper module that brakes a brake disc by hydraulic drive; the hydraulic pressure detection module is used for detecting the braking hydraulic pressure of the brake caliper assembly, detecting the real-time thickness, thickness variation, end jump value, friction coefficient or surface hardness data of the brake disc, judging the variation trend of the parameters, testing the service life of the brake disc meeting the use conditions, predicting the service life of the part according to the data variation trend, and realizing the process monitoring of the performance variation of the brake disc.
Description
Technical Field
The invention relates to the technical field of vehicle braking tests, in particular to a system and a method for monitoring the surface performance of a brake disc.
Background
At present, the design level of the brake disc is continuously improved, and more heat treatment processes in other fields are beginning to be applied to the field of the brake disc, such as nitrocarburizing, hot chromium plating and the like. These treatments give very significant performance improvements to the brake discs, but because these techniques do not take long time to apply to the brake discs, do not have sufficient application experience, and the brake discs are subject to wear parts, and there is no prediction of the service life of the brake discs treated by these techniques, this results in the performance of the brake discs in relation to the friction discs being affected by the amount of wear on their surfaces during development of the project in which these surface treated brake discs are used, especially in certain friction disc tests where the wear strength is high, there may be cases where the surface layer of the brake discs wears out, or even one friction material is in contact with both brake disc surfaces. Some devices for detecting the performance of the brake disc also appear in the related technology, but the existing detection technology is difficult to detect different parameters of the brake disc in real time along with the braking, so that the change trend of the surface performance of the brake disc is difficult to accurately obtain, and the service life of a surface layer is difficult to estimate.
Disclosure of Invention
The invention provides a system and a method for monitoring the surface performance of a brake disc, which are used for detecting various parameters of the brake disc in real time along with the braking, and detecting and recording the change condition of the performance of the brake disc along with the increase of the braking times.
According to an embodiment of the first aspect of the invention, a brake disc surface performance monitoring system comprises:
the driving module is used for driving the brake disc to rotate;
the speed detection module is used for detecting the rotation speed of the brake disc;
the torque detection module is used for detecting the torque born by the brake disc;
the distance detection module comprises at least two detection probes which are oppositely arranged on two sides of the friction surface of the brake disc, and the detection probes are used for detecting the distance between the detection probes and the side surface of the brake disc;
the hardness detection module is used for detecting the hardness of the surface of the brake disc;
a brake caliper module that brakes a brake disc by hydraulic drive;
and the hydraulic pressure detection module is used for detecting the brake hydraulic pressure of the brake caliper assembly.
According to a second aspect of the embodiment of the invention, a method for detecting the surface performance of a brake disc comprises the following steps:
circularly braking the brake disc by controlling the brake hydraulic pressure and the brake initial speed;
calculating the real-time thickness, thickness variation and end jump value of the brake disc by detecting the distance between the detection probe and the side surface of the brake disc in real time;
calculating to obtain real-time braking pressure by detecting the braking hydraulic pressure in real time;
detecting the real-time braking torque applied to the brake disc in real time;
calculating to obtain the real-time friction coefficient of the surface of the brake disc and the friction plate according to the brake pressure, the brake torque and the effective radius of the brake caliper;
detecting the surface hardness of the brake disc;
and controlling the thickness, the thickness variation, the end jump value, the friction coefficient and the preset variation threshold value of the surface hardness of the brake disc, and stopping circulating braking when any one of the thickness, the thickness variation, the end jump value, the friction coefficient and the surface hardness of the brake disc reaches the preset variation threshold value.
According to some embodiments of the invention, the method for detecting surface properties of a brake disc further comprises:
and predicting the service life of the brake disc according to the thickness, the thickness variation, the end jump value, the friction coefficient or the variation trend of the surface hardness of the brake disc.
According to some embodiments of the invention, the circulating braking of the brake disc by controlling the brake hydraulic pressure and the initial braking speed further comprises:
detecting the temperature of the brake disc in real time, and setting a first preset temperature threshold value and a second preset temperature threshold value;
and stopping circulating braking when the temperature of the brake disc is higher than the first preset temperature threshold value, and cooling the brake disc to be lower than the second preset temperature threshold value and then performing circulating braking.
According to some embodiments of the invention, the circulating braking of the brake disc by controlling the brake hydraulic pressure and the initial braking speed further comprises:
the brake final speed per cycle braking was controlled to be 0km/h.
According to some embodiments of the invention, the detecting the surface hardness of the brake disc further comprises:
the surface hardness of the brake disc after stopping rotation is detected.
According to some embodiments of the invention, the calculating the real-time thickness, the thickness variation and the end jump value of the brake disc by detecting the distance between the distance sensor and the side surface of the brake disc in real time further comprises:
confirming that the distances between the detection probes on two sides of the brake disc and the surfaces on two sides of the brake disc are a1 and a2 respectively, and the distance between the two detection probes on two sides of the brake disc is L;
calculating the end jump values of the two sides of the brake disc respectively through the variation amounts of a1 and a 2;
obtaining the real-time thickness of the brake disc through a relation L- (a1+a2);
respectively calculating the thickness average value of each circle of the brake disc according to the real-time thickness set of each circle of the brake disc;
and obtaining the thickness variation of the brake disc of each circle through the difference value between the maximum value and the minimum value of the real-time thickness of the brake disc of each circle.
According to some embodiments of the invention, the calculating the real-time brake pressure by detecting the brake fluid pressure in real time includes:
through the relationCalculation is performed, wherein P is the brake fluid pressure, S is the piston end surface area of the hydraulic cylinder in the brake caliper assembly, and F is the brake pressure provided by the brake caliper assembly to the brake disc.
According to some embodiments of the invention, the calculating the real-time friction coefficient of the brake disc and the friction plate surface according to the brake pressure, the brake torque and the brake friction area includes:
through the relationCalculation is performed, wherein mu is the friction coefficient of the surface of the brake disc and the friction plate, M is the real-time braking torque applied to the brake disc, F is the braking pressure provided by the brake caliper assembly to the brake disc, and r is the effective radius of the brake caliper.
According to some embodiments of the invention, the brake disc surface performance monitoring system further comprises:
according to the real-time deceleration obtained by calculating the braking speed of the brake disc through real-time detection, the braking moment is controlled to achieve the aim of constant deceleration through controlling the braking hydraulic pressure.
According to the system and the method for monitoring the surface performance of the brake disc, disclosed by the embodiment of the invention, the system and the method have the following beneficial effects: the invention can judge the variation trend of the parameters according to the detected thickness, thickness variation, end jump value, friction coefficient or surface hardness data of the brake disc in real time, can test the service life of the brake disc meeting the use condition, can estimate the service life of parts according to the data variation trend, realizes the process monitoring of the performance variation of the brake disc, and provides objective data supplement for the development of a brake system, in particular the evaluation of the performance of the brake disc in the development process of the brake disc.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a partial front view of a brake disc surface performance monitoring system of the present invention;
FIG. 2 is a side view of the brake disc surface performance monitoring system of the present invention;
FIG. 3 is a control logic diagram of the method for monitoring the surface properties of a brake disc according to the present invention;
fig. 4 is a control logic diagram of the brake disc surface performance monitoring method according to the present invention, which controls hydraulic pressure according to real-time deceleration.
Reference numerals:
a drive shaft 100;
a brake caliper module 200;
a speed sensor 300;
a torque sensor 400;
a distance sensor 500; a detection probe 510;
hardness tester 600;
a hydraulic pressure sensor 700;
brake disc 800.
Detailed Description
Reference numerals of (c) denote the same or similar elements or elements having the same or similar functions. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1 and 2, a brake disc surface performance monitoring system according to an embodiment of the present invention includes: the device comprises a driving module, a speed detection module, a torque detection module, a distance detection module, a hardness detection module, a brake caliper module 200 and a hydraulic pressure detection module.
The driving module of this embodiment is used for driving the brake disc 800 to rotate, and the driving module includes a driving shaft 100, and when testing, the brake disc 800 is clamped on the driving shaft 100, and the brake caliper module 200 is driven through hydraulic pressure, and the brake caliper module 200 is connected with hydraulic piping system, and hydraulic piping system is connected with the pneumatic cylinder on the brake caliper module 200, and the pneumatic cylinder drives the brake caliper to realize the action to braking, and the friction disc is installed on the brake caliper, drives two friction discs of brake disc 800 both sides through the brake caliper and is close to each other or keep away from each other to realize the braking to brake disc 800.
The speed detection module of the present embodiment is for detecting the rotational speed of the brake disc 800, and includes a speed sensor 300 installed at the driving shaft 100 in the center of the brake disc 800.
The torque detection module of the present embodiment is used for detecting the torque applied to the brake disc 800, and is mounted on the torque sensor 400 at the driving shaft 100 in the center of the brake disc 800.
The distance detection module of this embodiment includes a distance sensor 500, the distance sensor 500 is disposed on two sides of the friction surface of the brake disc 800, and the distance sensor 500 is provided with detection probes 510, the detection probes 510 on two sides of the brake disc 800 are disposed opposite to each other along the axial direction of the brake disc 800, and the detection probes 510 are spaced from the side surfaces of the brake disc 800 by a distance based on different brake discs 800, and meanwhile, the distance between the detection probes 510 on two sides of the brake disc 800 in this embodiment is also constant.
The hardness detection module of this embodiment is used for detecting the hardness of the surface of the brake disc 800, and the hardness detection module includes a non-contact hardness detector 600 disposed on two sides of the brake disc 800.
The hydraulic pressure detection module of this embodiment is used for detecting the brake hydraulic pressure of the brake caliper assembly, and the hydraulic pressure detection module includes a hydraulic pressure sensor 700 installed in the brake caliper oil inlet pipe.
The brake disc surface performance monitoring system of this embodiment further includes a data processor and a controller, where the data processor is connected with the controller, and the data processor is connected with the driving module, the speed detecting module, the torque detecting module, the distance detecting module, the hardness detecting module, the brake caliper module 200 and the hydraulic pressure detecting module at the same time.
As shown in fig. 3, this embodiment further provides a method for detecting surface properties of a brake disc, including:
step S1: the brake disc 800 is mounted, and the distance between the detection probes 510 on the distance sensors 500 on both sides of the brake disc 800 and the surfaces on both sides of the brake disc 800 is a1 and a2, respectively, and the distance between the two detection probes 510 is L.
Step S2: the system is started, the brake disc 800 rotates at a preset initial braking speed, the distance sensor 500 keeps a measuring state, the numerical values of a1 and a2 are recorded, the data processor calculates the end jump values b1 and b2 on two sides of the brake disc 800 respectively according to the change amounts of a1 and a2, and the real-time thickness of the brake disc 800 is obtained through L- (a1+a2)And calculating the average value delta of the thickness of each circle of the brake disc 800 by a data processor, and obtaining the thickness variation of each circle by the difference value between the maximum value and the minimum value of the real-time thickness of each circle of the brake disc 800.
Step S3: the data processor calculates deceleration according to the speed variation amount from the data detected by the speed sensor 300 while monitoring the pressure p of the brake fluid pressure in real time by the fluid pressure sensor 700 by the relational expressionThe calculation is performed where S is the area of the piston face of the hydraulic cylinder in the caliper assembly and F is the brake pressure provided by the caliper assembly to the brake disc 800 to obtain the brake pressure, where the area of the piston face of the hydraulic cylinder in the caliper assembly is a fixed value and is known prior to testing.
Step S4: the torque sensor 400 detects the torque M applied to the brake disc 800 at the time of braking in real time.
Step S5: the data processor can calculate F and the effective radius r of the brake caliper according to the formula through the torque M detected by the torque sensor 400 and F calculated in the step S3Obtain brakingFriction coefficient of disc 800 and friction plate surface +.>The effective radius of the brake caliper is a fixed value and is known prior to testing.
Step S6: after waiting until the brake disc 800 is affected by the braking force until the rotation is stopped, the hardness detector 600 is used to detect the surface hardness H of the brake disc 800, that is, to control the brake end speed per cycle to be 0km/H.
Step S7: and repeating the steps S1-S6, monitoring the temperature of the brake disc 800 through a temperature sensor during the process, stopping circulating braking when the temperature of the brake disc 800 is higher than the first preset temperature threshold value, cooling the brake disc 800 to be lower than the second preset temperature threshold value, and then performing circulating braking, wherein the first preset temperature threshold value is higher than the second preset temperature threshold value, and the first preset temperature threshold value and the second preset temperature threshold value are determined according to reality, so that the brake disc 800 is mainly ensured to be tested in a reasonable temperature range to meet the actual braking working condition.
Step S8: when the controller receives the friction coefficient mu, the thickness delta of the brake disc, the thickness variation DTV, the end jump values b1 and b2 or the surface hardness H output by the data processor and reaches a preset variation threshold value, the test is stopped after the cycle is completed.
The service life of the brake disc 800 can be estimated according to the change trend of the friction coefficient mu, the brake disc thickness delta, the thickness variation DTV, the end jump values b1 and b2 or the surface hardness H.
In some embodiments, different brake fluid pressures, initial brake speeds, are controlled to apply cyclic braking according to different brake discs 800.
As shown in fig. 4, in this embodiment, different braking strategies can be simulated in steps S3-S5 by using the data of the hydraulic pressure sensor 700 and the speed sensor 300, for example, the magnitude of hydraulic pressure is controlled according to the calculated deceleration detected by the speed sensor 300, so as to control the braking torque to achieve the purpose of constant deceleration, and the real-time deceleration is calculated according to the braking speed detected by the real-time brake disc 800, so as to control the braking torque to achieve the purpose of constant deceleration by controlling the braking hydraulic pressure.
The system can be added into other rack equipment to assist in controlling program operation in experiments of other brake discs 800 or friction plates, and can control the state of the brake discs 800.
According to the system and the method for monitoring the surface performance of the brake disc, disclosed by the embodiment of the invention, the system and the method have the following beneficial effects: the invention can judge the variation trend of the parameters according to the detected thickness, thickness variation, end jump value, friction coefficient or surface hardness data of the brake disc 800 in real time, can test the service life of the brake disc 800 meeting the use condition, can estimate the service life of parts according to the data variation trend, realizes the process monitoring of the performance variation of the brake disc 800, and provides objective data supplement for the development of a brake system, in particular the evaluation of the performance of the brake disc 800 in the development process.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (10)
1. A brake disc surface performance monitoring system, comprising:
the driving module is used for driving the brake disc to rotate;
the speed detection module is used for detecting the rotation speed of the brake disc;
the torque detection module is used for detecting the torque born by the brake disc;
the distance detection module comprises at least two detection probes which are oppositely arranged on two sides of the friction surface of the brake disc, and the detection probes are used for detecting the distance between the detection probes and the side surface of the brake disc;
the hardness detection module is used for detecting the hardness of the surface of the brake disc;
a brake caliper module that brakes a brake disc by hydraulic drive;
and the hydraulic pressure detection module is used for detecting the brake hydraulic pressure of the brake caliper assembly.
2. A method for detecting the surface property of a brake disc, comprising:
circularly braking the brake disc by controlling the brake hydraulic pressure and the brake initial speed;
calculating the real-time thickness, thickness variation and end jump value of the brake disc by detecting the distance between the detection probe and the side surface of the brake disc in real time;
calculating to obtain real-time braking pressure by detecting the braking hydraulic pressure in real time;
detecting the real-time braking torque applied to the brake disc in real time;
calculating to obtain the real-time friction coefficient of the surface of the brake disc and the friction plate according to the brake pressure, the brake torque and the effective radius of the brake caliper;
detecting the surface hardness of the brake disc;
and controlling the thickness, the thickness variation, the end jump value, the friction coefficient and the preset variation threshold value of the surface hardness of the brake disc, and stopping circulating braking when any one of the thickness, the thickness variation, the end jump value, the friction coefficient and the surface hardness of the brake disc reaches the preset variation threshold value.
3. A method of detecting surface properties of a brake disc according to claim 2, wherein:
the method for detecting the surface performance of the brake disc further comprises the following steps:
and predicting the service life of the brake disc according to the thickness, the thickness variation, the end jump value, the friction coefficient or the variation trend of the surface hardness of the brake disc.
4. A method of detecting surface properties of a brake disc according to claim 2, wherein:
the method for circularly braking the brake disc by controlling the brake hydraulic pressure and the brake initial speed further comprises the following steps:
detecting the temperature of the brake disc in real time, and setting a first preset temperature threshold value and a second preset temperature threshold value;
and stopping the circulating braking when the temperature of the brake disc is higher than the first preset temperature threshold value, and performing the circulating braking after the brake disc is cooled to be lower than the second preset temperature threshold value.
5. A method of detecting surface properties of a brake disc according to claim 2, wherein:
the method for circularly braking the brake disc by controlling the brake hydraulic pressure and the brake initial speed further comprises the following steps:
the brake final speed per cycle braking was controlled to be 0km/h.
6. The method for detecting the surface property of a brake disc according to claim 5, wherein:
the detecting the surface hardness of the brake disc further includes:
the surface hardness of the brake disc after stopping rotation is detected.
7. A method of detecting surface properties of a brake disc according to claim 2, wherein:
the method for calculating the real-time thickness, thickness variation and end jump value of the brake disc by detecting the distance between the distance sensor and the side surface of the brake disc in real time further comprises the following steps:
confirming that the distances between the detection probes on two sides of the brake disc and the surfaces on two sides of the brake disc are a1 and a2 respectively, and the distance between the two detection probes on two sides of the brake disc is L;
calculating the end jump values of the two sides of the brake disc respectively through the variation amounts of a1 and a 2;
obtaining the real-time thickness of the brake disc through a relation L- (a1+a2);
respectively calculating the thickness average value of each circle of the brake disc according to the real-time thickness set of each circle of the brake disc;
and obtaining the thickness variation of the brake disc of each circle through the difference value between the maximum value and the minimum value of the real-time thickness of the brake disc of each circle.
8. A method of detecting surface properties of a brake disc according to claim 2, wherein:
the calculating the real-time brake pressure by detecting the brake hydraulic pressure in real time comprises the following steps:
through the relationCalculation is performed, wherein P is the brake fluid pressure, S is the piston end surface area of the hydraulic cylinder in the brake caliper assembly, and F is the brake pressure provided by the brake caliper assembly to the brake disc.
9. The method for detecting surface properties of a brake disc according to, wherein:
the calculation of the real-time friction coefficient of the surface of the brake disc and the surface of the friction plate according to the brake pressure, the brake torque and the brake friction area comprises the following steps:
through the relationCalculation is performed, wherein mu is the friction coefficient of the surface of the brake disc and the friction plate, M is the real-time braking torque applied to the brake disc, F is the braking pressure provided by the brake caliper assembly to the brake disc, and r is the effective radius of the brake caliper.
10. A method of detecting surface properties of a brake disc according to claim 2, wherein:
the method for detecting the surface performance of the brake disc further comprises the following steps:
according to the real-time deceleration obtained by calculating the braking speed of the brake disc through real-time detection, the braking moment is controlled to achieve the aim of constant deceleration through controlling the braking hydraulic pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311692204.1A CN117869499A (en) | 2023-12-11 | 2023-12-11 | Brake disc surface performance monitoring system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311692204.1A CN117869499A (en) | 2023-12-11 | 2023-12-11 | Brake disc surface performance monitoring system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117869499A true CN117869499A (en) | 2024-04-12 |
Family
ID=90593642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311692204.1A Pending CN117869499A (en) | 2023-12-11 | 2023-12-11 | Brake disc surface performance monitoring system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117869499A (en) |
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2023
- 2023-12-11 CN CN202311692204.1A patent/CN117869499A/en active Pending
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