CN220251698U - Friction testing device for wire rod surface coating for aviation fastener - Google Patents
Friction testing device for wire rod surface coating for aviation fastener Download PDFInfo
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- CN220251698U CN220251698U CN202321972968.1U CN202321972968U CN220251698U CN 220251698 U CN220251698 U CN 220251698U CN 202321972968 U CN202321972968 U CN 202321972968U CN 220251698 U CN220251698 U CN 220251698U
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- wire rod
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- friction force
- surface coating
- grinding tool
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- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 239000011248 coating agent Substances 0.000 title claims abstract description 49
- 238000000576 coating method Methods 0.000 title claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 7
- 229910001069 Ti alloy Inorganic materials 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 238000010998 test method Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Abstract
The utility model relates to a friction force testing device for a wire rod surface coating for an aviation fastener, which comprises a sample table, a grinding tool, a self-resistance heating device, a pressing device and a tangential stress sensor, wherein the grinding tool can be arranged above a placing part in an up-and-down moving way, can slide along the axial direction of the wire rod sample and forms a friction pair with the surface of the wire rod sample. The self-resistance heating device can apply pulse current to the wire rod sample, and the pressing device can apply normal load to the wire rod sample through the grinding tool. The utility model can establish a corresponding test mode aiming at the friction force under the actual working condition (such as the high temperature of 600-850 ℃), realize the relative movement of the wire rod sample under the high temperature state and the grinding tool at the room temperature, and meet the detection and collection of friction data under the condition of hot working.
Description
Technical Field
The utility model relates to the field of titanium alloy processing detection, in particular to a friction force testing device for a wire rod surface coating for an aviation fastener.
Background
The coating on the surface of the titanium alloy wire rod can effectively reduce the friction force between the titanium alloy wire rod and the grinding tool when upsetting the fastener, ensure that metal deformation is uniform, avoid upsetting defects, prolong the service life of the grinding tool, improve the production efficiency and meet the requirement of continuous upsetting processing of the titanium alloy fastener in the field of military industry. Whether the coating can meet the requirement of continuous upsetting processing of the titanium alloy fastener after the wire rod is coated with the coating or not often needs to measure the friction performance of the coating on the metal surface, so that the lubricity of the coating on the metal surface is correspondingly evaluated, whether the wire rod can be used or not can be verified, and uncertainty exists.
The conventional measurement mode is to realize the contact of the friction body and the metal surface by a friction performance tester to measure friction performance parameters, but the conventional detection method mainly measures the friction force of the coating of the wire rod at room temperature, and has no corresponding test method and evaluation system for the friction force under actual working conditions (such as high temperature 600-850 ℃); the friction force under the actual working condition (such as the high temperature of 600-850 ℃) can only depend on a hot upsetter to carry out the actual upsetting test at present so as to check whether the coating of the wire rod reaches the upsetting processing requirement of the titanium alloy fastener, and the process is time-consuming and labor-consuming, and even can cause the damage of equipment and a die.
Therefore, the inventor provides a friction force testing device for a wire rod surface coating for an aviation fastener by virtue of experience and practice of related industries for many years, so as to overcome the defects of the prior art.
Disclosure of Invention
The utility model aims to provide a friction force testing device for a wire rod surface coating for an aviation fastener, which can establish a corresponding testing mode aiming at friction force under actual working conditions (such as high temperature 600-850 ℃), realize relative movement between a wire rod sample in a high temperature state and a grinding tool at room temperature, and meet the detection and collection of friction data under the condition of hot working.
The above object of the present utility model can be achieved by the following technical solutions:
the utility model provides a friction force testing device for a wire and rod surface coating for an aviation fastener, which is used for carrying out friction force testing on a wire and rod sample with a coating on the surface, and comprises the following components:
a sample stage having a placement section for placing a wire rod sample;
the grinding tool can move up and down and is arranged above the placing part, and the grinding tool can slide along the axial direction of the wire rod sample and form a friction pair with the surface of the wire rod sample;
a self-resistance heating device capable of applying a pulse current to the wire rod sample;
a pressing device capable of applying a normal load to the wire rod sample by the grinding tool;
and the tangential stress sensor is used for detecting friction force between the grinding tool and the wire rod sample.
In a preferred embodiment of the present utility model, the self-resistance heating device comprises a power supply device and two contact electrodes arranged on the sample stage, wherein the power supply device is connected with the two contact electrodes through corresponding wires, and the two contact electrodes can be respectively contacted with two end surfaces of the wire rod sample.
In a preferred embodiment of the present utility model, the self-resistance heating device further comprises a controller and a temperature sensor, wherein the temperature sensor can be used for detecting the surface temperature of the wire rod sample, and the controller is connected with the power supply device and the temperature sensor and can control the output current of the power supply device.
In a preferred embodiment of the present utility model, a circulating water cooling channel is provided inside the grinding tool.
In a preferred embodiment of the utility model, a chute is arranged on the sample stage, a sliding block capable of sliding is arranged in the chute, the contact electrode is fixedly arranged on the sliding block, and the sliding block can be fixedly connected with the sample stage through a fastener.
In a preferred embodiment of the present utility model, a ceramic base is provided on the sample stage, and the upper surface of the ceramic base has grooves with two open ends and forms a placement portion.
In a preferred embodiment of the utility model, the friction force testing device for the surface coating of the wire rod further comprises a mounting seat, wherein the mounting seat comprises a fixed block and a movable block which are detachably connected, and the grinding tool is a rectangular plate body and is clamped and fixed between the fixed block and the movable block; the tangential stress sensor is fixedly arranged above the fixed block.
In a preferred embodiment of the utility model, a limit groove is formed on one side surface of the fixed block, one part of the movable block is embedded in the limit groove, the other part of the movable block is clamped on the bottom surface of the fixed block and forms a clamping groove with the extension plate on the bottom surface of the fixed block, and the grinding tool is clamped in the clamping groove; a bolt is connected between the movable block and the fixed block, a buffer spring is sleeved on the bolt, and two ends of the buffer spring respectively lean against between the side face of the movable block and the bottom of the limiting groove.
In a preferred embodiment of the utility model, a connecting column is fixedly arranged above the tangential stress sensor, and the pressing device is connected with the connecting column.
According to the friction force testing device, the test is not required to be carried out in an integral heating environment, the temperature control precision is high by adopting a self-heating mode of the wire rod, the grinding tool of the friction pair can be kept at a room temperature state, the relative movement between the wire rod sample in the high temperature state and the grinding tool at the room temperature is realized, the friction force test and evaluation under the actual working condition (such as high temperature 600-850 ℃) are more met, and whether the coating of the wire rod meets the requirement of upsetting processing of a fastener can be verified without depending on a hot forging machine to carry out an actual upsetting test; the method of directly performing the test on the wire rod material is adopted, a single plane test piece is not needed, the real working condition of the wire rod material during upsetting the fastener can be better simulated, and a time-saving and labor-saving test method is provided for the high-temperature friction force of the coating; the friction force test method is particularly suitable for friction force test of the surface coating of the titanium alloy wire rod for the aviation fastener.
Drawings
The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:
fig. 1: the utility model provides a structural schematic diagram I of a friction force testing device for a wire rod surface coating for an aviation fastener.
Fig. 2: the structural schematic diagram II of the friction force testing device for the wire rod surface coating for the aviation fastener is provided.
Fig. 3: the utility model provides a side view of a friction force testing device for a wire rod surface coating for an aviation fastener.
Fig. 4: the utility model provides a top view of a friction force testing device for a wire rod surface coating for an aviation fastener.
Fig. 5: is a cross-sectional view along A-A of fig. 4.
Reference numerals illustrate:
1. a sample stage; 11. a ceramic base; 12. a chute; 121. a track; 13. a slide block;
2. a wire rod sample;
31. a contact electrode; 32. a wire;
4. grinding tool;
5. a mounting base; 51. a fixed block; 511. a limit groove; 512. an extension plate; 52. a movable block; 53. a bolt; 54. a buffer spring;
6. a tangential stress sensor;
7. and (5) connecting the columns.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.
As shown in fig. 1 to 5, the present application provides a wire and rod surface coating friction force testing device for an aviation fastener, which is used for carrying out friction force testing on a wire and rod sample 2 with a coating on the surface, and the wire and rod surface coating friction force testing device for an aviation fastener comprises:
a sample stage 1 having a placement section for placing a wire rod sample 2;
the grinding tool 4 is arranged above the placement part in a vertically movable way, and the grinding tool 4 can slide along the axial direction of the wire rod sample 2 and form a friction pair with the surface of the wire rod sample 2;
a self-resistance heating device capable of applying a pulse current to the wire rod sample 2;
a pressing device capable of applying a normal load to the wire rod sample 2 through the grinding tool 4;
and a tangential stress sensor 6 for detecting the friction between the grinding tool 4 and the wire rod sample 2.
When the wire rod sample 2 to be tested is used, the wire rod sample 2 to be tested is placed on the placement part, and the grinding tool 4 is still positioned above the wire rod sample 2 and is separated and not contacted with the wire rod sample 2; then pulse current is applied to the wire rod sample 2 by utilizing a self-resistance heating device, joule heat generated by the current enables the wire rod sample 2 to be heated rapidly, after the wire rod sample 2 reaches the temperature, the grinding tool 4 is moved downwards to be in contact with the surface coating of the wire rod sample 2, a certain normal load is applied to the wire rod sample 2 by utilizing a pressing device, the grinding tool 4 is moved axially, a certain moving speed is kept, friction force is generated between the surface coating of the wire rod sample 2 and the grinding tool 4, and the tangential stress sensor 6 starts to collect friction data (friction force).
Therefore, the friction force testing device does not need to test in an integral heating environment, the temperature control precision is high by adopting a wire rod self-heating mode, the grinding tool 4 of the friction pair can be kept at a room temperature state, the relative movement between the wire rod sample 2 in the high temperature state and the grinding tool 4 at the room temperature is realized, the friction force testing and evaluation under actual working conditions (such as high temperature 600-850 ℃) are more met, and whether the coating of the wire rod meets the requirement of upsetting processing of a fastener can be verified without depending on a hot forging machine to carry out an actual upsetting test; the method of directly performing the test on the wire rod material is adopted, a single plane test piece is not needed, the real working condition of the wire rod material during upsetting the fastener can be better simulated, and a time-saving and labor-saving test method is provided for the high-temperature friction force of the coating; the friction force test method is particularly suitable for friction force test of the surface coating of the titanium alloy wire rod for the aviation fastener.
In a specific implementation, referring to fig. 1, the self-resistance heating device comprises a power supply device and two contact electrodes 31 arranged on the sample stage 1, the power supply device is connected with the two contact electrodes 31 through corresponding leads 32, and the two contact electrodes 31 can be respectively contacted with two end surfaces of the wire rod sample 2.
The contact electrode 31 may be, for example, a conductive copper electrode, and has higher conductivity. The two contact electrodes 31 are oppositely arranged, after the wire rod sample 2 is placed, the surface of the contact electrode 31 can be contacted with the end face of the wire rod sample 2, and the power supply device supplies power to the contact electrode 31 through a lead wire 32 (conductive and signal connecting wire).
Preferably, the self-resistance heating device further comprises a controller and a temperature sensor, wherein the temperature sensor can be used for detecting the surface temperature of the wire rod sample 2, and the controller is connected with the power supply device and the temperature sensor and can control the output current of the power supply device.
The temperature sensor may be, for example, an infrared temperature sensor, and may be mounted on the sample stage 1, and the temperature may be monitored by using an infrared temperature measurement method.
The controller, the temperature sensor, the power supply device and the contact electrode 31 form an intelligent closed loop self-resistance heating system, and after pulse current is applied to the wire rod sample 2, the wire rod sample 2 is quickly heated by Joule heat generated by the current to reach a required temperature range; the temperature sensor can detect the temperature of the wire rod sample 2 in real time in the whole test process, and feeds back a temperature signal to the controller, and the controller controls the output current of the power supply device according to the fed-back temperature to adjust the heating rate and the heating temperature of the wire rod sample 2 so as to ensure that the test temperature meets the requirements.
It should be noted that, because the whole test time is very short, and the wire rod sample 2 is heated before the test begins, the wire rod sample 2 and the grinding tool 4 are separated during heating, and the initial temperature of the grinding tool 4 during the test is room temperature, the relative movement between the wire rod sample 2 in a high temperature state and the grinding tool 4 in room temperature can be simulated, and the relative movement is consistent with the actual working condition.
In practical application, in order to better guarantee the room temperature state of grinding apparatus 4, better simulation actual operating mode can be equipped with the circulating water cooling passageway in the inside of grinding apparatus 4, through carrying out circulating water cooling, the temperature of grinding apparatus 4 stability of assurance friction pair that can be better.
Further, in order to facilitate the installation of the wire rod sample 2, a chute 12 is provided on the sample stage 1, a sliding block 13 capable of sliding is provided in the chute 12, the contact electrode 31 is fixedly provided on the sliding block 13, and the sliding block 13 can be fixedly connected with the sample stage 1 through a fastener. When the wire rod sample 2 is mounted, the sliding block 13 can be moved towards the direction that the two contact electrodes 31 are away from each other, the sliding block 13 can be moved towards the direction that the two contact electrodes 31 are close to each other after the wire rod sample 2 is placed, until the contact electrodes 31 are contacted with the end face of the wire rod sample 2, and then the sliding block 13 is fixed on the sample table 1 through a fastener.
Referring to fig. 1, two rails 121 disposed in parallel with each other may be fixed to the sample stage 1, and the space between the two rails 121 may constitute the chute 12. The slider 13 may be an L-shaped block as shown in fig. 1, a part of which is slidably inserted into the chute 12, and another perpendicular block is fixed to the contact electrode 31 (but may be fastened or otherwise). Corresponding mounting holes are formed in the sample table 1 at positions corresponding to the two sliding grooves 12 and in the two sliding blocks 13, and after the wire rod sample 2 is placed and the contact electrode 31 moves to a designated position, the sliding blocks 13 and the sample table 1 can be fixed through screws.
In order to facilitate placement of the wire rod sample 2, a ceramic base 11 is generally provided on the sample stage 1, and the upper surface of the ceramic base 11 has grooves open at both ends and constitutes a placement portion.
The material of the grinding tool 4 is generally the same as that of the upsetting die, and for example, high-speed steel or cemented carbide is used.
Further, in order to facilitate the installation of the grinding tool 4, the friction force testing device for the surface coating of the wire rod also comprises an installation seat 5, wherein the installation seat 5 comprises a fixed block 51 and a movable block 52 which are detachably connected, and the grinding tool 4 is a rectangular plate body and is clamped and fixed between the fixed block 51 and the movable block 52; the tangential stress sensor 6 is fixed above the fixed block 51.
Specifically, referring to fig. 2, 3 and 5, a limit groove 511 is formed on one side surface of the fixed block 51, a part of the movable block 52 is embedded in the limit groove 511, the other part of the movable block is clamped on the bottom surface of the fixed block 51 and forms a clamping groove with an extension plate 512 on the bottom surface of the fixed block 51, and the grinding tool 4 is clamped in the clamping groove; a bolt 53 is connected between the movable block 52 and the fixed block 51, a buffer spring 54 is sleeved on the bolt 53, and two ends of the buffer spring 54 respectively lean against between the side surface of the movable block 52 and the bottom of the limit groove 511.
The fixing block 51 may be a square block, the limit groove 511 is a T-shaped groove, and the extension plate 512 is formed by extending downward from one side of the bottom surface of the fixing block 51; the movable block 52 may be an i-shaped block, the upper T-shaped part of the i-shaped block is inserted into the T-shaped groove, and the lower block is clamped on the bottom surface of the fixed block 51 to form a clamping groove with the extension plate 512. The bolt 53 is connected between the upper T-shaped portion of the i-shaped block and the bottom of the limit groove 511, specifically, the fixed block 51 is passed through and then connected with the movable block 52. The buffer spring 54 has the function of giving a force to two sides after the bolt 53 is screwed up, increasing the friction force between the movable block 52 and the bolt 53, preventing the loosening of the bolt 53 caused by the vibration of equipment in operation, effectively relieving the vibration and the vibration, and playing a protective role. Of course, the grinding tool 4 may be fixed in other ways as desired, and this embodiment is merely illustrative.
Further, a connecting column 7 is fixedly arranged above the tangential stress sensor 6, and the pressing device is connected with the connecting column 7. The pressing device may be, for example, a conventional tester.
Furthermore, the application also provides a friction force testing method for the surface coating of the wire rod for the aviation fastener, which adopts the friction force testing device for the surface coating of the wire rod for the aviation fastener to test, and comprises the following steps:
placing a wire rod sample 2 to be tested on the placing part;
applying pulse current to the wire rod sample 2 by using a self-resistance heating device so as to enable the wire rod sample 2 to reach a preset temperature;
moving the grinding tool 4 downwards to be in contact with the surface coating of the wire rod sample 2, and applying a normal load to the wire rod sample 2 by using a pressing device;
the grinder 4 is moved axially and the friction between the wire rod sample 2 and the grinder 4 is collected by means of a tangential stress sensor 6.
The working principle and the beneficial effects of the testing method are the same as those of the device, and are not repeated here.
To sum up, the test device and method of the present application fixes the coated wire rod sample 2 on the sample stage 1 to contact with the grinding tool 4, and moves the grinding tool 4 and the wire rod sample 2 into a friction pair under high temperature and normal load. In the test, friction data are measured by a tangential stress sensor 6 on the grinding tool 4, and a friction coefficient curve can be drawn on a measuring instrument. The wire and rod sample 2 is independently heated in a mode of electrifying and heating the wire and rod, so that the wire and rod sample 2 is independently tested at the hot working temperature, the grinding tool 4 is in the normal temperature range, reproduction of actual working conditions can be better realized, and friction data detection and collection under the hot working condition are realized. When the method and the device are applied to the titanium alloy wire and bar for the aviation fastener, a time-saving and labor-saving detection method and a time-saving detection device are provided for the wire and bar coating for the titanium alloy fastener, and the friction performance of the lubricating coating coated on the surface of the titanium alloy wire and bar can be detected and evaluated according to the characteristics of the titanium alloy and the manufacturing technical requirements of hot heading.
The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this utility model, and are intended to be within the scope of this utility model.
Claims (9)
1. The utility model provides a silk rod surface coating friction force testing arrangement for aviation fastener, its characterized in that is used for carrying out friction force test to the silk rod sample that has the coating on the surface, silk rod surface coating friction force testing arrangement for aviation fastener includes:
a sample stage having a placement section for placing the wire rod sample;
the grinding tool can move up and down and is arranged above the placing part, and the grinding tool can slide along the axial direction of the wire rod sample and forms a friction pair with the surface of the wire rod sample;
a self-resistance heating device capable of applying a pulsed current to the wire rod sample;
a pressing device capable of applying a normal load to the wire rod sample through the abrasive tool;
and a tangential stress sensor for detecting friction between the abrasive tool and the wire rod sample.
2. The friction force testing device for wire rod surface coating for aviation fastener according to claim 1, wherein,
the self-resistance heating device comprises a power supply device and two contact electrodes arranged on the sample table, wherein the power supply device is connected with the two contact electrodes through corresponding wires, and the two contact electrodes can be respectively contacted with two end surfaces of the wire rod sample.
3. The friction force testing device for wire rod surface coating for aviation fastener according to claim 2, wherein,
the self-resistance heating device further comprises a controller and a temperature sensor, wherein the temperature sensor can be used for detecting the surface temperature of the wire rod sample, and the controller is connected with the power supply device and the temperature sensor and can control the output current of the power supply device.
4. A wire rod surface coating friction force testing device for aviation fasteners according to claim 2 or 3, characterized in that,
and a circulating water cooling channel is arranged in the grinding tool.
5. The friction force testing device for wire rod surface coating for aviation fastener according to claim 2, wherein,
the sample bench is provided with a chute, a sliding block capable of sliding is arranged in the chute, the contact electrode is fixedly arranged on the sliding block, and the sliding block can be fixedly connected with the sample bench through a fastener.
6. The friction force testing device for wire rod surface coating for aviation fastener according to claim 1, wherein,
the sample table is provided with a ceramic base, and the upper surface of the ceramic base is provided with grooves with two open ends and forms the placing part.
7. The friction force testing device for wire rod surface coating for aviation fastener according to claim 1, wherein,
the friction force testing device for the surface coating of the wire rod material further comprises an installation seat, wherein the installation seat comprises a fixed block and a movable block which are detachably connected, and the grinding tool is a rectangular plate body and is clamped and fixed between the fixed block and the movable block; the tangential stress sensor is fixedly arranged above the fixed block.
8. The friction force testing device for wire rod surface coating for aviation fastener according to claim 7, wherein,
a limiting groove is formed in one side face of the fixed block, one part of the movable block is embedded in the limiting groove, the other part of the movable block is clamped on the bottom face of the fixed block and forms a clamping groove with the extending plate on the bottom face of the fixed block, and the grinding tool is clamped in the clamping groove; the movable block is connected with the fixed block through a bolt, a buffer spring is sleeved on the bolt, and two ends of the buffer spring respectively lean against between the side face of the movable block and the bottom of the limiting groove.
9. The friction force testing device for wire rod surface coating for aviation fastener according to claim 1, wherein,
and a connecting column is fixedly arranged above the tangential stress sensor, and the pressing device is connected with the connecting column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321972968.1U CN220251698U (en) | 2023-07-25 | 2023-07-25 | Friction testing device for wire rod surface coating for aviation fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321972968.1U CN220251698U (en) | 2023-07-25 | 2023-07-25 | Friction testing device for wire rod surface coating for aviation fastener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220251698U true CN220251698U (en) | 2023-12-26 |
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ID=89263430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321972968.1U Active CN220251698U (en) | 2023-07-25 | 2023-07-25 | Friction testing device for wire rod surface coating for aviation fastener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220251698U (en) |
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2023
- 2023-07-25 CN CN202321972968.1U patent/CN220251698U/en active Active
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