CN218865672U - Flange gasket compression resilience test testing machine - Google Patents
Flange gasket compression resilience test testing machine Download PDFInfo
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- CN218865672U CN218865672U CN202223142265.4U CN202223142265U CN218865672U CN 218865672 U CN218865672 U CN 218865672U CN 202223142265 U CN202223142265 U CN 202223142265U CN 218865672 U CN218865672 U CN 218865672U
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Abstract
The utility model belongs to the technical field of testing machines, in particular to a flange gasket compression resilience testing machine, which comprises a bracket and a base, wherein the bracket is arranged on the base and also comprises a pressure-applying device, a pressure-down device, a load sensor, a moving device, a power device and a measuring device; the moving device and the power device are both arranged in the base, and the power device is in driving connection with the moving device; the upper pressing device is arranged at the lower end of the bracket, the lower pressing device is arranged on the base, and the load sensor is arranged at the lower end of the heating and cooling device II; the measuring device is arranged on one side of the upper pressure plate and one side of the lower pressure plate; the flange gasket compression and resilience testing machine is externally connected with a control system, and the power device, the load sensor, the measuring device, the upper pressure plate and the lower pressure plate are all in communication connection with the control system; compared with the prior art, the utility model discloses can enough be experimental under normal atmospheric temperature, also can be experimental under low temperature or high temperature, have that the precision is high, superior performance, reliability are high, the noise is low, operate steadily, characteristics such as convenient operation.
Description
Technical Field
The utility model belongs to the technical field of the testing machine, concretely relates to flange gasket compression resilience test testing machine.
Background
At present, with the development of petrochemical industry, higher requirements are provided for the compression rebound rate, residual deformation, performance indexes at normal temperature and high temperature of various flange gaskets for pipelines, and when the flange gaskets are connected by pipeline flanges, the gaskets between two flanges play a role in sealing. The existing testing machine can only test at normal temperature, and needs to test some flange gaskets at low temperature or high temperature, the existing testing machine cannot complete the test, if the existing testing machine is used for testing at low temperature or high temperature, data inaccuracy is inevitably caused, and the use of the flange gaskets is finally influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a flange gasket compression resilience test testing machine to foretell problem.
In order to achieve the above object, the utility model discloses a technical scheme be: a compression and resilience test testing machine for a flange gasket comprises a support and a base, wherein the support is arranged on the base and comprises an upper pressing device, a lower pressing device, a load sensor, a moving device, a power device and a measuring device; the moving device and the power device are both arranged in the base, and the power device is in driving connection with the moving device; the upper pressing device is arranged below the bracket, and one end of the upper pressing device, which is far away from the bracket, is arranged on the moving device; a heating and cooling device set is arranged in the upper pressing device; a first bulge and a first groove are formed in the upper pressing device, and the first groove and the first bulge are matched with each other; a gasket to be measured is placed in the first groove; the load sensor is arranged at the lower end of the upper pressing device and the lower pressing device; the measuring device is arranged on one side of the upper pressing device and the lower pressing device; the external control system of flange gasket compression resilience test testing machine, power device, load sensor, measuring device and heating cooling device group all with control system communication connection.
Preferably, the upper pressing device comprises an upper pressing device and a lower pressing device; the heating and cooling device group comprises a first heating and cooling device and a second heating and cooling device; the first heating and cooling device is arranged in the upper pressing device, and the first bulge is arranged at one end of the upper pressing device, which is far away from the support; the pressing device is arranged on the moving device; the heating and cooling device II is arranged in the pressing device, and the groove I is formed in one end, far away from the moving device, of the pressing device; and the first heating and cooling device and the second heating and cooling device are in communication connection with the control system.
Preferably, the upper pressing device comprises an upper pressing disc, and the first heating and cooling device is installed below the bracket; the upper pressure plate is arranged at the lower end of the first heating and cooling device, and the first bulge is arranged at one end of the upper pressure plate, which is far away from the first heating and cooling device; the second heating and cooling device is arranged above one end, far away from the base, of the moving device; the lower pressing plate is installed at the upper end of the heating and cooling device II, and a first groove is formed in one end, far away from the base, of the lower pressing plate.
Preferably, the first heating and cooling device comprises an upper cooling plate, an upper heating plate and a first connecting piece group, and the first connecting piece group is arranged below the bracket; the upper cooling plate is arranged below the connecting piece group; the upper heating plate is arranged below the upper cooling plate; the upper pressing plate is arranged below the upper heating plate; a first cooling pipeline is installed in the upper cooling disc and is externally connected with a first cooling device; a first heating plate is arranged in the upper heating plate; the first cooling device and the first heating plate are both in communication connection with the control system.
Preferably, the second heating and cooling device comprises a lower heating plate, a lower cooling plate and a third connecting piece, and the third connecting piece is arranged above the moving device; the lower cooling plate is arranged above the third connecting piece; the lower heating plate is arranged above the lower cooling plate; the lower pressing disc is arranged above the lower heating disc; a second cooling pipeline is installed in the lower cooling disc and is externally connected with a second cooling device; a second heating plate is arranged in the upper heating plate; and the second cooling device and the second heating plate are in communication connection with the control system.
Preferably, the load sensor is installed below the third connecting member.
Preferably, the moving device comprises a screw rod and a moving block, and a first thread is formed on the periphery of the screw rod; a second thread matched with the first thread is formed in the moving block, and the moving block can move up and down along the lead screw; the moving block is connected with one end of the third connecting piece, which is far away from the lower cooling disc; the power device is in driving connection with the screw rod.
Preferably, the power device comprises a speed reducer, a servo motor and a transmission device, and an output shaft of the speed reducer is detachably connected with the screw rod; the input shaft of the speed reducer is connected with the output shaft of the servo motor through a transmission device; and the servo motor is in communication connection with the control system.
Preferably, the measuring device comprises a measuring meter, a first meter frame, a second meter frame and a measuring block, wherein the first meter frame is arranged on the side surface of the upper pressure plate, and the second meter frame is arranged on the side surface of the lower pressure plate; a measuring head of the measuring meter penetrates through the meter frame I and is flush with the lower end of the bulge I of the upper pressure plate; the upper end of the measuring block penetrates through the second meter frame to be flush with the bottom end of the first groove of the lower pressure plate; the measuring meter is in communication connection with the control system.
Compared with the prior art, the utility model discloses an advantage lies in with positive effect:
(1) The existing testing machine can not carry out the test at low temperature or high temperature, but the upper heating plate and the lower heating plate are arranged in the utility model, so that the testing machine can carry out the test at high temperature, and the accuracy of the test data at high temperature is ensured;
(2) The utility model is also provided with an upper cooling plate and a lower cooling plate, so that the testing machine can carry out the test at low temperature and ensure the accuracy of the test data at low temperature;
(3) The utility model can be tested at normal temperature and at low temperature or high temperature, and meets all the requirements of the flange gasket on the measured temperature;
(4) The utility model adopts the ball screw and the servo motor, and the thickness of the gasket when stressed is measured through the digital display dial indicator, so that the compression ratio and the rebound rate of the flange gasket can be accurately tested;
(5) The utility model has the characteristics of the precision is high, superior performance, the reliability is high, the noise is low, operate steadily, convenient operation etc.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described as follows:
FIG. 1 is a front view of a flange gasket compression spring back test machine according to example 1 in an initial state;
FIG. 2 is a front view of a flange gasket compression spring back test machine in a working state;
FIG. 3 is a schematic view of the initial state of the compression spring test tester for flange gaskets;
FIG. 4 is a schematic view of the working state of the compression and rebound testing machine for flange gaskets;
FIG. 5 is a cross-sectional view of the flange gasket in an initial state of the compression spring back test machine;
FIG. 6 is a cross-sectional view showing the operation state of the compression spring tester for flange gasket.
Description of reference numerals:
1-bracket, 101-pillar, 102-beam;
2-a base, 3-a first connecting piece, 4-a second connecting piece, 5-an upper cooling plate, 6-an upper heating plate and 7-an upper pressure plate;
8-measuring device, 801-measuring meter, 802-meter frame one, 803-meter frame two, 804-measuring block;
9-lower pressure plate, 10-lower heating plate, 11-lower cooling plate, 12-connecting piece III, 13-load sensor, 14-sensor connecting block, 15-moving block, 16-screw rod, 17-speed reducer, 18-servo motor, 19-transmission device, 20-opening device and 21-gasket.
Detailed Description
In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the limitations set forth in the following description of the specific embodiments.
Example 1
The utility model discloses it is next described to combine accompanying drawing 1-6, a flange gasket compression resilience test testing machine, as shown in fig. 1-6, including support 1 and base 2, support 1 installs on base 2, as shown in fig. 5-6, including top pressure equipment, push down the device, load sensor 13, mobile device, power device and measuring device 8, mobile device and power device all install in base 2, and power device and mobile device drive are connected, the external control system of flange gasket compression resilience test testing machine.
The rack 1 includes a plurality of columns 101 and a beam 102, the plurality of columns 101 being mounted on the base 2, and the beam 102 being mounted between the plurality of columns 101.
As shown in fig. 1-6, the pressing device comprises an upper pressing plate 7 and a first heating and cooling device, the first heating and cooling device comprises an upper cooling plate 5, an upper heating plate 6 and a first connecting piece group, and the first connecting piece group is arranged below the cross beam 102; the upper cooling plate 5 is arranged below the connecting piece group; the upper heating plate 6 is arranged below the upper cooling plate 5; an upper platen 7 is mounted below the upper heating pan 6.
As shown in fig. 1 to 6, the first connecting member set includes a first connecting member 3 and a second connecting member 4, the first connecting member 3 is installed at the lower end of the beam 102, and the second connecting member 4 is installed between the first connecting member 3 and the upper cooling plate 5.
A first cooling pipeline is installed in the upper cooling disc 5 and is externally connected with a first cooling device; a first heating plate is arranged in the upper heating plate 6; the first cooling device and the first heating plate are both in communication connection with the control system.
The first cooling pipeline in the upper cooling disc 5 is disc-shaped, and the cooling device leads cooling water or tap water into the first cooling pipeline to achieve the effect of cooling.
Go up the heating plate one in the heating plate 6 and can improve flange gasket compression resilience test machine's temperature, be applicable to the flange gasket under the high temperature condition experimental.
The pressing device comprises a pressing plate 9 and a heating and cooling device II, the heating and cooling device II comprises a lower heating plate 10, a lower cooling plate 11 and a connecting piece III 12, and the connecting piece III 12 is arranged above the moving device; the lower cooling plate 11 is arranged above the third connecting piece 12; the lower heating plate 10 is arranged above the lower cooling plate 11; the lower platen 9 is mounted above the lower heating pan 10.
A second cooling pipeline is installed in the lower cooling disc 11 and is externally connected with a second cooling device; a second heating plate is arranged in the upper heating plate 6; and the second cooling device and the second heating plate are both in communication connection with the control system.
The second cooling pipeline in the lower cooling disc 11 is disc-shaped, cooling water or tap water is introduced into the cooling pipeline in two directions by the cooling device, and the lower cooling disc 11 and the upper cooling disc 5 act together to achieve the cooling effect. The heating plate I in the lower heating plate 10 and the heating plate II in the upper heating plate 6 act together to achieve the effect of temperature rise.
As shown in fig. 1, 3 and 5, a first protrusion is arranged at one end of the upper platen 7, which is far away from the first heating and cooling device; one end of the lower pressure plate 9, which is far away from the base 2, is provided with a first groove; the first groove is matched with the first protrusion; a second circular protrusion is formed in the first groove, and the measured gasket 21 is sleeved on the periphery of the second circular protrusion.
The circular ring can be sleeved on the two peripheries of the circular bulges according to different sizes of the gasket 21, so that the gasket 21 is not easy to loosen when sleeved.
As shown in fig. 1 to 6, the measuring device 8 includes a measuring meter 801, a first meter holder 802, a second meter holder 803, and a measuring block 804, wherein the first meter holder 802 is installed on the side surface of the upper platen 7, and the second meter holder 803 is installed on the side surface of the lower platen 9; the measuring head of the measuring meter 801 penetrates through a meter frame I802 to be flush with the lower end of a bulge of the upper pressure plate 7; the upper end of the measuring block 804 passes through the second meter frame 803 and is flush with the bottom end of the groove of the lower pressing disc 9; the meter 801 is communicatively connected to the control system.
The measuring gauge 801 is a digital dial indicator which can detect the thickness of the gasket 21, and when the first groove of the lower pressing plate 9 and the first protrusion of the upper pressing plate 7 are matched with each other, the measuring gauge 801 obtains the thickness of the gasket 21 under the stress action through the distance between the measuring head at the lower end and the upper end of the measuring block 804.
As shown in fig. 5-6, the moving device comprises a lead screw 16 and a moving block 15, wherein a first thread is arranged on the periphery of the lead screw 16; a second thread matched with the first thread is formed in the moving block 15, and the moving block 15 can move up and down along the screw rod 16; the moving block 15 is connected with one end of the third connecting piece 12 far away from the lower cooling plate 11; the power device is in driving connection with the screw rod 16.
The moving device is a ball screw, the moving block 15 moves up and down along the direction of the screw 16 through matching with the screw 16, and drives the pressing device to move up and down, so that the first groove of the lower pressing plate 9 is matched with the first protrusion of the upper pressing plate 7.
As shown in fig. 5-6, the power device comprises a speed reducer 17, a servo motor 18 and a transmission device 19, wherein an output shaft of the speed reducer 17 is detachably connected with the screw rod 16; the input shaft of the speed reducer 17 is connected with the output shaft of the servo motor 18 through a transmission device 19; the servo motor 18 is in communication with the control system.
The load sensor 13 is arranged below the third connecting piece 12 of the low-pressure device; the lower end of the load sensor 13 is provided with a sensor connecting block 14, the load sensor 13 is used for calculating the load of the gasket 21, and the load sensor 13 is in communication connection with the control system.
The control system comprises a control box and an opening device 20, wherein the opening device 20 is installed on one side of the base 2 and used for opening the flange gasket compression and resilience testing machine, the servo motor 18, the cooling device I, the cooling device II, the heating sheet I and the heating sheet II are controlled by the control box, and a numerical value measured by the measuring meter 801 and the stress sensed by the load sensor 13 are transmitted to the control box.
The control box controls the speed of the output shaft of the servo motor 18, so as to control the moving speed of the moving block 15 along the screw rod 16, and finally control the stress of the gasket 21.
The control box has control modes such as constant-speed test deformation, constant-speed stress, test force holding and deformation holding.
The utility model discloses a flange gasket compression resilience test testing machine mainly tests compression ratio, rebound resilience, residual deformation isoparametric of gasket 21, before experimental, will be to name, internal diameter and the external diameter of gasket 21 that the control box internal input surveyed to set for experimental load.
The test process is that the preload is increased to the test load, and when the preload is reduced to the preload, the preload is 0.
The load of the gasket is calculated by the formula: gasket load = gasket force/gasket area = gasket force/[ 3.14 (gasket outer diameter) 2 Inner diameter of the gasket 2 ）/4]。
The compression ratio is: compressibility = thickness at test load/thickness at preload 100%.
The rebound resilience is as follows: rebound resilience = (thickness at test load-thickness at preload drop)/thickness at test load 100%. The larger the rebound rate is, the better the tension is when the pipeline is connected, and the sealing performance is good.
The utility model discloses the operating procedure under the normal atmospheric temperature is as follows:
(1) Before the test, inputting the name, the inner diameter and the outer diameter of the tested gasket 21 and the thickness of the gasket 21 measured in the preloading process into a control box, and setting the test load;
(2) Sleeving a measured gasket 21 on the periphery of a circular bulge II in a groove I, opening an opening device 20, starting the operation of a flange gasket compression and resilience test machine, controlling a servo motor 18 to operate by a control box, and driving a pressing device to move towards an upward pressing device by a moving block 15;
(3) When the first bulge of the upper pressure plate 7 is in contact with the first groove of the lower pressure plate 9, the measured gasket 21 is stressed, the load sensor 13 senses the force applied to the gasket 21 and transmits the force value to the control box, and the measuring meter 801 also transmits the thickness value corresponding to the force applied to the gasket 21 to the control box;
(4) The servo motor 18 continuously operates, the moving block 15 continuously rises, in the test process, the load sensor 13 and the measuring meter 801 continuously transmit numerical values to the control box, and when the load displayed by the control box is the test load set before the test, the output shaft of the servo motor 18 changes the rotating direction, so that the moving block 15 moves downwards;
(5) When the load displayed by the control box is a preload, the measuring gauge 801 and the load sensor 13 stop transmitting numerical values, and the control box obtains the compression rate and the rebound rate through the force applied to the gasket 21 measured in the test process and the thickness of the gasket 21 corresponding to the force.
The utility model discloses operating procedure under the low temperature and the operating procedure difference under the normal atmospheric temperature are:
(1) Before the test, connecting the first cooling device with a first cooling pipeline in the upper cooling plate 5, and then connecting the second cooling device with a second cooling pipeline in the lower cooling plate 11;
(2) Before the servo motor 18 is controlled to operate, the first cooling device and the second cooling device are controlled to operate, the first cooling device conveys cooling water or tap water into the first cooling pipeline, the second cooling device conveys cooling water or tap water into the second cooling pipeline, and when the low temperature specified by the test is reached, the servo motor 18 is controlled to operate.
The utility model discloses operating procedure under the high temperature is different with the operating procedure under the normal atmospheric temperature:
(1) Before controlling the operation of the servo motor 18, the operation of the first heating plate in the upper heating plate 6 and the second heating plate in the lower heating plate 10 are controlled, and when the high temperature specified by the test is reached, the operation of the servo motor 18 is controlled.
The utility model provides a control box obtains gasket 21 load numerical value according to the gasket 21 thickness that the size of the gasket 21 that surveys received power and corresponds among the test process to obtain gasket 21 compression resilience curve that gasket 21 load numerical value and gasket 21 thickness correspond, and then obtain the compression ratio and the rebound rate of gasket 21 that survey.
The utility model is suitable for a winding gasket, graphite gasket, gather tetrafluoro gasket, parcel gasket and asbestos gasket etc..
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes to be applied in other fields, but all the technical matters of the present invention are not departed from the technical contents of the present invention, and any simple modification and equivalent changes made to the above embodiments according to the technical matters of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (9)
1. A compression and resilience test testing machine for a flange gasket comprises a support (1) and a base (2), wherein the support (1) is arranged on the base (2), and is characterized by further comprising an upper pressing and pressing device, a load sensor (13), a moving device, a power device and a measuring device (8);
the moving device and the power device are both arranged in the base (2), and the power device is in driving connection with the moving device;
the upper pressing device is arranged below the bracket (1), and one end of the upper pressing device, which is far away from the bracket (1), is arranged on the moving device; a heating and cooling device set is arranged in the upper pressing device;
a first bulge and a first groove are formed in the upper pressing device, and the first groove and the first bulge are matched with each other; a gasket (21) to be measured is placed in the first groove;
the load sensor (13) is arranged at the lower end of the upper pressing device and the lower pressing device; the measuring device (8) is arranged on one side of the upper pressing device and the lower pressing device;
the external control system of the flange gasket compression and resilience testing machine, wherein the power device, the load sensor (13), the measuring device (8) and the heating and cooling device set are all in communication connection with the control system.
2. The flange gasket compression spring back test testing machine of claim 1, wherein the upper pressing device and the lower pressing device comprise an upper pressing device and a lower pressing device; the heating and cooling device group comprises a first heating and cooling device and a second heating and cooling device;
the first heating and cooling device is arranged in the upper pressing device, and the first bulge is arranged at one end of the upper pressing device, which is far away from the support (1);
the pressing device is arranged on the moving device; the heating and cooling device II is arranged in the pressing device, and the groove I is formed in one end, far away from the moving device, of the pressing device;
and the first heating and cooling device and the second heating and cooling device are in communication connection with a control system.
3. The compression spring test testing machine for flange gaskets according to claim 2, characterized in that the pressing device comprises an upper pressing disc (7), and the heating and cooling device is installed below the bracket (1); the upper pressing plate (7) is arranged at the lower end of the first heating and cooling device, and the first bulge is arranged at one end, far away from the first heating and cooling device, of the upper pressing plate (7);
the pressing device comprises a pressing plate (9), and the heating and cooling device II is installed above one end, far away from the base (2), of the moving device; lower pressure disk (9) are installed in heating and cooling device two upper ends, lower pressure disk (9) keep away from the one end of base (2) and seted up recess one.
4. The compression and resilience test machine for the gasket of the flange according to claim 3, wherein the first heating and cooling device comprises an upper cooling plate (5), an upper heating plate (6) and a first connecting piece group, and the first connecting piece group is arranged below the bracket (1);
the upper cooling plate (5) is arranged below the connecting piece group; the upper heating plate (6) is arranged below the upper cooling plate (5); the upper pressing plate (7) is arranged below the upper heating plate (6);
a first cooling pipeline is arranged in the upper cooling disc (5), and is externally connected with a first cooling device; a first heating plate is arranged in the upper heating plate (6);
the first cooling device and the first heating plate are both in communication connection with the control system.
5. The flange gasket compression resilience test testing machine according to claim 3, wherein the second heating and cooling device comprises a lower heating plate (10), a lower cooling plate (11) and a third connecting piece (12), and the third connecting piece (12) is installed above the moving device;
the lower cooling plate (11) is arranged above the third connecting piece (12); the lower heating plate (10) is arranged above the lower cooling plate (11); the lower pressing plate (9) is arranged above the lower heating plate (10);
a second cooling pipeline is installed in the lower cooling disc (11) and is externally connected with a second cooling device; a second heating plate is arranged in the upper heating plate (6);
and the second cooling device and the second heating plate are in communication connection with the control system.
6. A flange gasket compression rebound testing machine according to claim 5, characterized in that the load cell (13) is mounted below the third connecting member (12).
7. The compression and resilience test testing machine for the flange gasket according to claim 5, wherein the moving device comprises a lead screw (16) and a moving block (15), and the periphery of the lead screw (16) is provided with a first thread;
a second thread matched with the first thread is formed in the moving block (15), and the moving block (15) can move up and down along the lead screw (16);
the moving block (15) is connected with one end, far away from the lower cooling disc (11), of the connecting piece III (12); the power device is in driving connection with the screw rod (16).
8. The flange gasket compression resilience testing machine according to claim 7, wherein the power device comprises a speed reducer (17), a servo motor (18) and a transmission device (19), and an output shaft of the speed reducer (17) is detachably connected with the screw rod (16);
the input shaft of the speed reducer (17) is connected with the output shaft of the servo motor (18) through a transmission device (19);
the servo motor (18) is in communication connection with the control system.
9. The compression and rebound testing machine for flange gaskets according to claim 3, characterized in that the measuring device (8) comprises a measuring meter (801), a first meter frame (802), a second meter frame (803) and a measuring block (804), wherein the first meter frame (802) is mounted on the side of the upper platen (7), and the second meter frame (803) is mounted on the side of the lower platen (9);
the measuring head of the measuring meter (801) penetrates through the meter frame I (802) to be flush with the lower end of the bulge of the upper pressing plate (7);
the upper end of the measuring block (804) penetrates through the second meter frame (803) and is flush with the bottom end of the groove of the lower pressing disc (9);
the measuring meter (801) is in communication connection with the control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223142265.4U CN218865672U (en) | 2022-11-25 | 2022-11-25 | Flange gasket compression resilience test testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223142265.4U CN218865672U (en) | 2022-11-25 | 2022-11-25 | Flange gasket compression resilience test testing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218865672U true CN218865672U (en) | 2023-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223142265.4U Active CN218865672U (en) | 2022-11-25 | 2022-11-25 | Flange gasket compression resilience test testing machine |
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| Country | Link |
|---|---|
| CN (1) | CN218865672U (en) |
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2022
- 2022-11-25 CN CN202223142265.4U patent/CN218865672U/en active Active
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