CN213892795U - Embedded buffering backstop board - Google Patents
Embedded buffering backstop board Download PDFInfo
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- CN213892795U CN213892795U CN202021989021.8U CN202021989021U CN213892795U CN 213892795 U CN213892795 U CN 213892795U CN 202021989021 U CN202021989021 U CN 202021989021U CN 213892795 U CN213892795 U CN 213892795U
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Abstract
The utility model relates to a technical field of making an uproar falls in the damping especially relates to embedded buffering backstop board, include: a stopper plate body and a rubber buffer block; the rubber buffer block is inserted into the stopper plate main body through the T-shaped connecting plate and fixed, and the top surface of the rubber buffer block protrudes out of the inclined surface of the stopper plate main body; the rubber buffer block is internally provided with a cavity structure, and a damping unit capable of buffering vibration impact of the damping plate is arranged in the cavity. The utility model discloses the cooperation that other members need not in the navigation ware at the in-process of making an uproar is fallen in the realization.
Description
Technical Field
The utility model relates to a technical field of making an uproar falls in the damping especially relates to embedded buffering backstop board.
Background
The aircraft may have a plurality of channels with a front cover disposed over each channel port. When the front cover is opened in place, the resistance reducing plate collides with the stop plate, and great impact noise is generated. The opening noise of the resistance reducing plate is reduced, and the impact stress can be reduced by reducing the impact speed when the resistance reducing plate is contacted with the stop plate or increasing the contact time of the resistance reducing plate and the stop plate.
In the prior art, the method is realized by optimizing a hydraulic transmission control system. However, the optimization method is not only complex but also requires the cooperation of a plurality of components, and the satisfactory noise reduction effect is difficult to achieve.
SUMMERY OF THE UTILITY MODEL
The utility model provides an embedded buffering backstop board, it is simple structure not only, realizes moreover that the in-process of making an uproar is fallen and need not the cooperation of other members in the navigation ware.
The utility model provides an embedded buffering backstop board, include: a stopper plate body and a rubber buffer block;
the rubber buffer block is inserted into the stopper plate main body through the T-shaped connecting plate and fixed, and the top surface of the rubber buffer block protrudes out of the inclined surface of the stopper plate main body;
the rubber buffer block is internally provided with a cavity structure, and a damping unit capable of buffering vibration impact of the damping plate is arranged in the cavity.
Further, the damping unit includes: a plurality of support friction modules and a plurality of clamping friction modules;
when the rubber buffer block is subjected to vibration impact of the resistance reducing plate, each supporting friction module generates a first friction force in the direction opposite to the impact force of the resistance reducing plate, and each clamping connection friction module generates a second friction force in the direction opposite to the impact force of the resistance reducing plate.
More closely, a plurality of support friction module symmetry respectively set up the both sides at a plurality of joint friction module.
More closely, the supporting friction module comprises: the upper supporting damping block and the lower supporting damping block;
the top end of the upper supporting damping block is fixed on the top wall of the rubber buffer block;
the bottom end of the lower supporting damping block is fixed on the bottom wall of the rubber buffer block;
the bottom end of the upper supporting damping block is movably sleeved with the top end of the lower supporting damping block;
when the rubber buffer block is subjected to vibration impact of the damping plate, the bottom end of the upper supporting damping block moves along the lower supporting damping block, and the top end of the lower supporting damping block moves along the upper supporting damping block, so that corresponding first friction force is generated.
More closely, the clamping friction module comprises: the upper clamping damping block and the lower clamping damping block are clamped;
the top end of the upper clamping damping block is fixed on the top wall of the rubber buffer block;
the bottom end of the lower clamping damping block is fixed on the bottom wall of the rubber buffer block;
the bottom of the upper clamping damping block is movably clamped with the top of the lower clamping damping block;
when the rubber buffer block is subjected to vibration impact of the damping plate, the bottom of the upper clamping damping block moves along the lower clamping damping block, and the top of the lower clamping damping block moves along the upper clamping damping block, so that corresponding second friction force is generated.
Furthermore, two supporting friction modules are arranged and are respectively and symmetrically arranged on two sides of the inner cavity of the rubber buffer block;
the upper supporting damping block is a planar damping block;
the included angles between the two upper supporting damping blocks and the central axis of the rubber buffer block are acute angles, and the bottom ends of the upper supporting damping blocks and the central axis of the rubber buffer block point to the bottom of the side of the cavity respectively;
the lower supporting damping block is a folding damping block, the lower part of the lower supporting damping block is parallel to the central axis of the rubber buffer block, and the upper part of the lower supporting damping block is parallel to the upper supporting damping block;
an energy absorption plate is arranged on the top wall of the rubber buffer block; the top end of each upper supporting damping block is fixedly connected with the top wall of the rubber buffer block through an energy absorption plate.
In the technical scheme, at least two clamping friction modules are arranged;
the upper clamping damping block and the lower clamping damping block are both in a 7 shape;
the first end face of the bottom of the upper clamping damping block abuts against the second inner face of the lower clamping damping block;
the second end surface of the top of the lower clamping damping block abuts against the first inner surface of the upper clamping damping block;
go up the first terminal surface and the first inner face of joint damping piece to and the second terminal surface and the second inner face of joint damping piece all are parallel to each other with rubber buffer block center pin down.
Further, a lower spring is connected between the bottom surface of the bottom of the upper clamping damping block and the bottom wall of the rubber buffer block;
an upper spring is connected between the top surface of the top of the lower clamping damping block and the top wall of the rubber buffer block;
when the rubber buffer block is subjected to vibration impact of the resistance reducing plate, the lower spring and the upper spring generate elastic force in the direction opposite to the impact force of the resistance reducing plate.
Furthermore, an energy absorption plate is arranged on the top wall of the rubber buffer block;
go up the top of joint damping piece, all pass through energy-absorbing plate and rubber buffer block roof fixed connection with the top of going up the spring.
In the technical scheme, the top surface of the rubber buffer block is parallel to the inclined surface of the stopper plate main body;
the end surface of the T-shaped connecting plate and the rubber buffer block are mutually vulcanized;
two threaded holes are formed in the inclined surface of the stop plate main body and respectively correspond to two ends of the T-shaped connecting plate;
and the T-shaped connecting plate is connected with the stop plate main body through two threaded holes after being inserted into the stop plate main body.
The utility model discloses in, insert the rubber buffer block to the backstop main part through T type connecting plate in, make the rubber buffer block dismantle conveniently, stability is good, the rubber buffer block can be directly in the face of the impact of drag reduction plate. In addition, the damping unit is designed in the rubber buffer block, so that the impact speed of the damping plate and the stop plate can be reduced, the contact time of the damping plate and the stop plate is prolonged, and the noise generated by the impact of the damping plate and the stop plate is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the rubber buffer block and the T-shaped connection plate in the embodiment of the present invention;
fig. 3(a) is a schematic structural diagram of an upper clamping damping block in the embodiment of the present invention; fig. 3(b) is a schematic structural diagram of a lower clamping damping block in the embodiment of the present invention;
FIG. 4 is a plot of fairing angular velocity for an aircraft;
FIG. 5 is a fairing angular acceleration profile for an aircraft;
FIG. 6 is a plot of flight vehicle drag reduction plate impact force variation.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 4 to 6, in order to find the magnitude of the impact force of the drag reduction plate with the stopper plate, it is necessary to determine the velocity, acceleration and time history of the drag reduction plate. Although the whole process can be regarded as a uniform acceleration process, the velocity of the drag reduction plate is always increased before the collision, which causes the final collision force to be too large and the noise to be too high. From the impact force profile of FIG. 6, it can be seen that the maximum impact force reached 14791N. To solve this problem, the collision time between the resistance reducing plate and the stopper plate must be prolonged to make the collision more stable and reduce the peak force generated during collision. Therefore, the collision time can be increased by additionally arranging the rubber anti-impact pad, the impact force generated in the collision process is reduced, and the noise generated in the collision is reduced.
As shown in fig. 1, the in-line buffering stopper provided by the present embodiment includes: a stopper plate body 1 and a rubber buffer block 3;
the rubber buffer block 3 is inserted into the stopper plate body 1 through the T-shaped connecting plate 2 and fixed, and the top surface of the rubber buffer block 3 protrudes out of the inclined surface of the stopper plate body 1;
the rubber buffer block 3 is internally provided with a cavity structure, and a damping unit capable of buffering vibration impact of the damping plate is arranged in the cavity.
In this embodiment, insert rubber buffer 3 to backstop piece main part 1 through T type connecting plate 2 in, make rubber buffer dismantle the convenience, stability is good, and rubber buffer 3 can be directly to the impact of subtracting the resistance plate. In addition, the damping unit is designed in the rubber buffer block 3, so that the impact speed of the resistance reducing plate and the stop plate can be reduced, the contact time of the resistance reducing plate and the stop plate is prolonged, and the noise generated by the impact of the resistance reducing plate and the stop plate is reduced.
In the present embodiment, the surface of the stopper plate body 1 is coated with a waterproof coating.
As shown in fig. 2, the damping unit includes: two supporting friction modules and two clamping friction modules;
when the rubber buffer block 3 is subjected to vibration impact of the resistance reducing plate, each supporting friction module generates a first friction force in the direction opposite to the impact force of the resistance reducing plate, and each clamping friction module generates a second friction force in the direction opposite to the impact force of the resistance reducing plate.
When the resistance plate hits the stopper plate, it is the rubber bumper 3 that comes into contact with the resistance plate. Due to the action of the material of the rubber buffer block 3, the impact force of a part of the resistance reducing plate can be relieved. The damping unit in the rubber cushion block 3 further damps the impact of the damper plate by the frictional force generated by the damping unit. Therefore, the buffering effect of the embodiment is good, the structure of the stop plate is only improved, and the matching of other components is not needed when the buffering and resistance reducing plate is impacted.
As shown in fig. 2, the two supporting friction modules are respectively and symmetrically arranged at two sides of the two clamping friction modules.
The support friction module includes: an upper support damping block 31 and a lower support damping block 32;
the top end of the upper supporting damping block 31 is fixed on the top wall of the rubber buffer block 3;
the bottom end of the lower supporting damping block 32 is fixed on the bottom wall of the rubber buffer block 3;
the bottom end of the upper supporting damping block 31 is movably sleeved with the top end of the lower supporting damping block 32;
when the rubber buffer block 3 is subjected to vibration impact of the damping plate, the bottom end of the upper support damping block 31 moves along the lower support damping block 32, and the top end of the lower support damping block 32 moves along the upper support damping block 31, so that a corresponding first frictional force is generated.
In the present embodiment, the friction coefficient of the contact surface between the upper support damper block 31 and the lower support damper block 32 is a first friction coefficient. The contact surface of the upper support damping block 31 and the lower support damping block 32 is specially processed, and the friction coefficient of the contact surface is larger than that of the common damping block.
As shown in fig. 2, the clamping friction module includes: an upper clamping damping block 33 and a lower clamping damping block 34;
the top end of the upper clamping damping block 33 is fixed on the top wall of the rubber buffer block 3;
the bottom end of the lower clamping damping block 34 is fixed on the bottom wall of the rubber buffer block 3;
the bottom of the upper clamping damping block 33 is movably clamped with the top of the lower clamping damping block 34;
when the rubber buffer block 3 is subjected to vibration impact of the damping plate, the bottom of the upper clamping damping block 33 moves along the lower clamping damping block 34, and the top of the lower clamping damping block 34 moves along the upper clamping damping block 33, so that corresponding second friction force is generated.
In the present embodiment, the friction coefficient of the contact surface between upper click damping piece 33 and lower click damping piece 34 is the first friction coefficient. The contact surfaces of the upper clamping damping block 33 and the lower clamping damping block 34 are specially processed, and the friction coefficient of the contact surfaces is larger than that of the surfaces of the common damping blocks.
As shown in fig. 2, two of the supporting friction modules are respectively and symmetrically arranged at two sides of the cavity in the rubber buffer block 3;
the upper supporting damping block 31 is a planar damping block;
the included angles between the two upper supporting damping blocks 31 and the central axis of the rubber buffer block 3 are acute angles, and the bottom ends of the upper supporting damping blocks point to the bottom of the side of the cavity respectively;
that is, the bottom ends of both upper support damping blocks 31 are directed outward, respectively.
The lower supporting damping block 32 is a folding damping block, the lower part of the lower supporting damping block is parallel to the central axis of the rubber buffer block 3, and the upper part of the lower supporting damping block is parallel to the upper supporting damping block 31;
an energy absorption plate 37 is arranged on the top wall of the rubber buffer block 3; the top end of each upper supporting damping block 31 is fixedly connected with the top wall of the rubber buffer block 3 through an energy absorption plate 37.
The above-mentioned structure of the upper support damping block 31 and the lower support damping block 32 allows a sufficient space between the two support friction modules to accommodate all the clamping friction modules. The lower part of the lower supporting damping block 32 is parallel to the central axis of the rubber buffer block 3. When the upper support damping block 31 and the lower support damping block 32 generate friction force after being impacted, the lower part of the lower support damping block 32 can be better supported.
As shown in fig. 2, 3(a) and 3(b), there are at least two snap friction modules;
the upper clamping damping block 33 and the lower clamping damping block 34 are both in a 7 shape;
the first end surface 331 at the bottom of the upper clamping damping block 33 abuts against the second inner surface 342 of the lower clamping damping block 34;
the second end surface 341 of the top of the lower clamping damping block 34 abuts against the first inner surface 332 of the upper clamping damping block 33;
the first end surface 331 and the first inner surface 332 of the upper clamping damping block 33, and the second end surface 341 and the second inner surface 342 of the lower clamping damping block 34 are parallel to the central axis of the rubber buffer block 3.
When the damping plate impacts the rubber buffer block 3, the upper clamping damping block 33 and the lower clamping damping block 34 which are abutted against each other generate a second friction force to relieve the impact force of the damping plate.
As shown in fig. 2, a lower spring 35 is connected between the bottom surface of the bottom of the upper clamping damping block 33 and the bottom wall of the rubber buffer block 3;
an upper spring 36 is connected between the top surface of the top of the lower clamping damping block 34 and the top wall of the rubber buffer block 3;
when the rubber cushion block 3 is subjected to the damper plate vibration impact, the lower spring 35 and the upper spring 36 generate elastic forces in the opposite direction to the damper plate impact force.
In the present embodiment, the lower spring 35 and the upper spring 36 can further alleviate the impact of the damper plate.
An energy absorption plate 37 is arranged on the top wall of the rubber buffer block 3;
the top of the upper clamping damping block 33 and the top end of the upper spring 36 are fixedly connected with the top wall of the rubber buffer block 3 through an energy absorption plate 37.
In this embodiment, the energy absorbing plate 37 is a flat damping block and is adhered to the top surface of the rubber cushion block 3. The energy absorbing plate 37 can absorb a part of the impact energy of the damping plate when the damping plate is impacted, and the rest vibration energy is transmitted to the supporting friction module and the clamping friction module. The energy absorption plate 37 can absorb energy and transmit energy, and can prevent the phenomenon that the upper support damping block 31, the upper clamping damping block 33 and the upper spring 36 fall off from the top wall of the rubber buffer block 3 after being impacted by the damping plate due to the direct connection with the rubber buffer block 3, so that the integrity and the durability of the embodiment are ensured.
The top surface of the rubber buffer block 3 is parallel to the inclined surface of the stopper plate main body 1;
this makes it possible to make the rubber bumper 3 have a larger impact surface against the resistance plate.
The end surface of the T-shaped connecting plate 2 and the rubber buffer block 3 are mutually vulcanized;
two threaded holes 4 are formed in the inclined surface of the stop plate main body 1 and respectively correspond to two ends of the T-shaped connecting plate 2;
the T-shaped connecting plate 2 is inserted into the stop plate body 1 and then is in bolted connection with the stop plate body 1 through two threaded holes 4.
In this embodiment, the damping units in the rubber buffer block 3 improve the transmission efficiency of the vibration force generated by the impact of the damping plate, so as to quickly absorb the consumed vibration energy and reduce the noise generation, and the other part of the vibration energy is absorbed by each damping block and prevents the vibration energy from being transmitted back, so that the generated friction force can consume the vibration energy as much as possible through the matching among the damping blocks, thereby improving the vibration and noise reduction effects of the device. Thus, the structure of the present embodiment can reduce noise generated when colliding with the resistance reducing plate.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, the invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An in-line cushioned stopper panel comprising: a stopper plate body (1) and a rubber buffer block (3);
the rubber buffer block (3) is inserted into the stopper plate main body (1) through the T-shaped connecting plate (2) for fixing, and the top surface of the rubber buffer block (3) protrudes out of the inclined surface of the stopper plate main body (1);
the rubber buffer block (3) is internally provided with a cavity structure, and a damping unit capable of buffering vibration impact of the damping plate is arranged in the cavity.
2. The in-line bumper stopper of claim 1, wherein the damping unit comprises: a plurality of support friction modules and a plurality of clamping friction modules;
when the rubber buffer block (3) is subjected to vibration impact of the resistance reducing plate, each supporting friction module generates a first friction force in the direction opposite to the impact force of the resistance reducing plate, and each clamping friction module generates a second friction force in the direction opposite to the impact force of the resistance reducing plate.
3. The in-line bumper stop of claim 2 wherein the plurality of support friction modules are symmetrically disposed on opposite sides of the plurality of snap friction modules.
4. The in-line bumper stop of claim 2, wherein the support friction module comprises: an upper support damping block (31) and a lower support damping block (32);
the top end of the upper supporting damping block (31) is fixed on the top wall of the rubber buffer block (3);
the bottom end of the lower supporting damping block (32) is fixed on the bottom wall of the rubber buffer block (3);
the bottom end of the upper supporting damping block (31) is movably sleeved with the top end of the lower supporting damping block (32);
when the rubber buffer block (3) is subjected to vibration impact of the damping plate, the bottom end of the upper supporting damping block (31) moves along the lower supporting damping block (32), and the top end of the lower supporting damping block (32) moves along the upper supporting damping block (31), so that a corresponding first friction force is generated.
5. The in-line bumper stop of claim 2, wherein the snapping friction module comprises: an upper clamping damping block (33) and a lower clamping damping block (34);
the top end of the upper clamping damping block (33) is fixed on the top wall of the rubber buffer block (3);
the bottom end of the lower clamping damping block (34) is fixed on the bottom wall of the rubber buffer block (3);
the bottom of the upper clamping damping block (33) is movably clamped with the top of the lower clamping damping block (34);
when the rubber buffer block (3) is subjected to vibration impact of the damping plate, the bottom of the upper clamping damping block (33) moves along the lower clamping damping block (34), and the top of the lower clamping damping block (34) moves along the upper clamping damping block (33), so that corresponding second friction force is generated.
6. The inline buffer stop plate according to claim 4, wherein there are two supporting friction modules symmetrically disposed at both sides of the cavity in the rubber buffer block (3);
the upper supporting damping block (31) is a planar damping block;
the included angles between the two upper supporting damping blocks (31) and the central axis of the rubber buffer block (3) are acute angles, and the bottom ends of the upper supporting damping blocks point to the bottom of the side of the cavity respectively;
the lower supporting damping block (32) is a folding damping block, the lower part of the lower supporting damping block is parallel to the central axis of the rubber buffer block (3), and the upper part of the lower supporting damping block is parallel to the upper supporting damping block (31);
an energy absorption plate (37) is arranged on the top wall of the rubber buffer block (3); the top end of each upper supporting damping block (31) is fixedly connected with the top wall of the rubber buffer block (3) through an energy absorption plate (37).
7. The in-line bumper stop of claim 5, wherein there are at least two of the snapping friction modules;
the upper clamping damping block (33) and the lower clamping damping block (34) are both 7-shaped;
a first end surface (331) at the bottom of the upper clamping damping block (33) is propped against a second inner surface (342) of the lower clamping damping block (34);
the second end face (341) at the top of the lower clamping damping block (34) abuts against the first inner face (332) of the upper clamping damping block (33);
the first end face (331) and the first inner face (332) of the upper clamping damping block (33) and the second end face (341) and the second inner face (342) of the lower clamping damping block (34) are parallel to the central axis of the rubber buffer block (3).
8. The inline buffering stopper plate of claim 7, wherein a lower spring (35) is connected between the bottom surface of the bottom of the upper clamping damping block (33) and the bottom wall of the rubber buffer block (3);
an upper spring (36) is connected between the top surface of the top of the lower clamping damping block (34) and the top wall of the rubber buffer block (3);
when the rubber buffer block (3) is subjected to vibration impact of the resistance reducing plate, the lower spring (35) and the upper spring (36) generate elastic force in the direction opposite to the impact force of the resistance reducing plate.
9. The inline buffer stop plate according to claim 8, wherein an energy absorbing plate (37) is provided on the top wall of the rubber buffer block (3);
the top of the upper clamping damping block (33) and the top end of the upper spring (36) are fixedly connected with the top wall of the rubber buffer block (3) through an energy absorption plate (37).
10. The inline buffering stopper of claim 1, wherein the top surface of the rubber bumper (3) and the inclined surface of the stopper body (1) are parallel to each other;
the end surface of the T-shaped connecting plate (2) and the rubber buffer block (3) are mutually vulcanized;
two threaded holes (4) are formed in the inclined surface of the stop plate main body (1) and respectively correspond to two ends of the T-shaped connecting plate (2);
the T-shaped connecting plate (2) is inserted into the stop plate main body (1) and then is in bolt connection with the stop plate main body (1) through two threaded holes (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021989021.8U CN213892795U (en) | 2020-09-13 | 2020-09-13 | Embedded buffering backstop board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021989021.8U CN213892795U (en) | 2020-09-13 | 2020-09-13 | Embedded buffering backstop board |
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| Publication Number | Publication Date |
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| CN213892795U true CN213892795U (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021989021.8U Active CN213892795U (en) | 2020-09-13 | 2020-09-13 | Embedded buffering backstop board |
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| CN (1) | CN213892795U (en) |
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