CN220016188U - Self-turning flap valve for powder discharging - Google Patents
Self-turning flap valve for powder discharging Download PDFInfo
- Publication number
- CN220016188U CN220016188U CN202320568436.5U CN202320568436U CN220016188U CN 220016188 U CN220016188 U CN 220016188U CN 202320568436 U CN202320568436 U CN 202320568436U CN 220016188 U CN220016188 U CN 220016188U
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- valve plate
- limiting part
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- powder
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- 239000000843 powder Substances 0.000 title claims abstract description 19
- 238000007599 discharging Methods 0.000 title description 7
- 239000008187 granular material Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 31
- 230000007423 decrease Effects 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 32
- 238000000034 method Methods 0.000 abstract description 16
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- Lift Valve (AREA)
Abstract
The utility model relates to the technical field of gate valves, in particular to a self-turning flap valve for powder and granule blanking, which comprises a first channel and a second channel, wherein one end of the first channel is coated outside one end of the second channel; the valve plate is arranged in the first channel, and one end of the valve plate is rotatably connected to the first channel; in a closed state, the valve plate is attached to one end of the second channel; in the process of closing or opening the second channel by rotating the valve plate, the valve plate cannot rub with one end of the second channel, so that one end of the second channel and/or the valve plate is worn, and the service lives of the second channel and the valve plate can be further prolonged; accordingly, friction between one end of the second channel and the valve plate is avoided, friction scraps are not generated, and the situation that friction scraps are mixed into materials in the blanking process is avoided, so that the materials are polluted.
Description
Technical Field
The utility model relates to the technical field of flap valves, in particular to an automatic flap valve for powder discharging.
Background
At present, in the industries of pharmacy, chemical industry and the like, solid materials are often required to be conveyed in a state of frequently switching between vacuum and normal pressure in the production process of products.
The solid materials are usually powder, granules and the like, and commonly adopted blanking devices are butterfly valves, gate valves and the like; when the butterfly valve is used for blanking, certain requirements are set on the properties of materials, the materials with viscosity cannot be obtained, otherwise, the butterfly valve is easy to squeeze the materials in the operation process, so that the materials are clustered, and the valve can be blocked for a long time. Even for common powder materials, the butterfly valve is easy to squeeze between the butterfly plate and the inner valve body when the butterfly valve rotates along with the rotation of the butterfly plate due to the fact that materials falling on the upper portion of the butterfly plate fall down in the long-time opening and closing process, and therefore tightness is poor.
If the gate valve is used for discharging, the required installation space is large, and in the opening and closing process, the sealing surfaces are rubbed relatively, abrasion is large, the service life is short, and friction scraps can be mixed in materials to pollute the materials.
Disclosure of Invention
The utility model provides a self-turning flap valve for powder and granule blanking, which aims at the problems in the prior art.
In order to solve the technical problems, the utility model is solved by the following technical scheme:
an automatic turning flap valve for powder and granule blanking, which comprises,
the device comprises a first channel and a second channel, wherein one end of the first channel is coated outside one end of the second channel;
the valve plate is arranged in the first channel, and one end of the valve plate is rotatably connected to the first channel;
in the closed state, the valve plate is attached to one end of the second channel.
Preferably, a first sealing ring extruded with the valve plate is arranged at one end of the second channel.
Preferably, a first mounting groove is formed at one end of the second channel; the first sealing ring is fixedly connected in the first mounting groove.
Preferably, the width of the cross section of the first mounting groove is gradually reduced from the inner end of the first mounting groove to the outer end of the first mounting groove.
Preferably, the first channel further comprises a first limit part and a second limit part; the first limiting part and the second limiting part are arranged outside the first channel, the first limiting part and the second limiting part are arranged at an included angle, and one ends of the first limiting part and the second limiting part, which are close to each other, are fixedly connected to the first channel;
and a third limiting part is further arranged between the first limiting part and the second limiting part, and one end of the third limiting part is fixedly connected with one end of the valve plate.
Preferably, the device further comprises a cover plate, wherein two ends of the cover plate are detachably connected with the first limiting part and the second limiting part respectively.
Preferably, a second sealing ring is arranged between the other end of the first limiting part and/or the other end of the second limiting part and the cover plate.
Preferably, the third limiting part is provided with a weight.
Preferably, an electromagnet for adsorbing the weight is arranged at the first limit part and/or the second limit part.
Preferably, the valve plate is in rotational engagement with the first passage via a tetrafluoro bearing.
The utility model has at least the following beneficial effects:
in the process of closing or opening the second channel by rotating the valve plate, the valve plate cannot rub with one end of the second channel, so that one end of the second channel and/or the valve plate is worn, and the service lives of the second channel and the valve plate can be further prolonged; accordingly, friction between one end of the second channel and the valve plate is avoided, friction scraps are not generated, and the situation that friction scraps are mixed into materials in the blanking process is avoided, so that the materials are polluted.
Drawings
FIG. 1 is a schematic illustration of a self-turning flap valve of the present utility model;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a partial enlarged view at B in FIG. 1;
fig. 4 is a schematic view of a third limiting portion and a valve plate in the present utility model.
The names of the parts indicated by the numerical references in the drawings are as follows:
110. a first channel; 111. a first flange; 112. a rotating shaft; 120. a second channel; 121. a second flange; 130. a valve plate; 140. a first limit part; 150. a second limit part; 160. a third limit part; 161. a weight block; 162. a third mounting groove; 163. a mounting hole; 164. a fastening nut; 170. a cover plate; 171. a handle; 180. an electromagnet; 210. a first seal ring; 220. a first mounting groove; 230. a tetrafluoro bearing; 310. a second seal ring; 320. and a second mounting groove.
Detailed Description
For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples. It is to be understood that the examples are illustrative of the present utility model and are not intended to be limiting.
As shown in fig. 1 and 4, the present embodiment provides a self-turning flap valve for powder and granular material discharging, which includes,
a first channel 110 and a second channel 120, wherein one end of the first channel 110 is coated outside one end of the second channel 120;
a valve plate 130 disposed in the first channel 110 and having one end rotatably connected to the first channel 110;
in the closed state, the valve plate 130 is attached to one end of the second channel 120.
In the present embodiment, the outer periphery of the other end of the first channel 110 is provided with a first flange 111, and the outer periphery of the other end of the second channel 120 is provided with a second flange 121; a rotating shaft 112 is arranged at the side wall of the first channel 110, and one end of the valve plate 130 is sleeved on the rotating shaft 112, so that the rotating connection between the valve plate 130 and the first channel 110 is realized.
During installation, the first flange 111 is connected with the collecting device through bolts, and the second flange 121 is connected with the host device through bolts, so that the other end of the first channel 110 is connected with the collecting device, and the other end of the second channel 120 is connected with the host device, so that the material can be transported from the host device to the collecting device through the self-turning flap valve in the embodiment.
In the use process, since one end of the valve plate 130 is rotationally connected in the first channel 110, when the valve plate 130 is driven to rotate towards one end of the second channel 120 until the valve plate 130 rotates to the second channel 120 and is attached to one end of the second channel 120, at this time, the valve plate 130 seals one end of the second channel 120, so that materials can only be accumulated on the valve plate 130 and cannot fall into the collecting device; when the valve plate 130 is driven to rotate in a direction away from one end of the second channel 120, the valve plate 130 unblocks the second channel 120, so that materials can fall into the collecting device from a gap between one end of the second channel 120 and the valve plate 130; further, in the process that the valve plate 130 rotates away from the second channel 120, as the gap between one end of the second channel 120 and the valve plate 130 is larger, the blanking efficiency is correspondingly improved, whereas in the process that the valve plate 130 rotates towards the second channel 120 until the second channel 120 is blocked, as the gap between one end of the second channel 120 and the valve plate 130 is smaller, the blanking efficiency is correspondingly reduced.
It should be noted that, in the process of closing or opening the second channel 120 by rotating the valve plate 130 in the present embodiment, friction is not performed with one end of the second channel 120, so that wear is caused on one end of the second channel 120 and/or the valve plate 130, and the service lives of the second channel 120 and the valve plate 130 can be further improved; accordingly, friction between one end of the second channel 120 and the valve plate 130 is avoided, friction scraps are not generated, and the situation that friction scraps are mixed into materials in the blanking process and cause pollution to the materials is avoided.
In this embodiment, as shown in fig. 2, a first sealing ring 210 pressed against the valve plate 130 is disposed at one end of the second channel 120.
Through the arrangement of the first sealing ring 210 in this embodiment, when the valve plate 130 rotates towards the direction of one end of the second channel 120, after the valve plate 130 releases to the first sealing ring 210, the valve plate 130 extrudes the first sealing ring 210 along with the continued rotation of the valve plate 130, so that after the valve plate 130 rotates in place, the first sealing ring 210 seals a gap between one end of the second channel 120 and the valve plate 130, and further, the sealing effect of the valve plate 130 on the second channel 120 is improved.
In this embodiment, a first mounting groove 220 is formed at one end of the second channel 120; the first seal ring 210 is fixedly connected to the first mounting groove 220.
By the arrangement of the first mounting groove 220 in this embodiment, the first sealing ring 210 can be preferably fixedly mounted on one end of the second channel 120; since there may be fine displacement of the valve plate 130 during rotation, the stability of the first sealing ring 210 disposed on the valve plate 130 is poor, and the first sealing ring 210 is directly disposed on one end of the second channel 120, so that even if the valve plate 130 is displaced, the sealing effect is not affected.
It should be noted that, in another preferred embodiment of the present utility model, the first sealing ring 210 may be fixedly mounted on one end of the second channel 120 by adhesion or other existing fixing methods.
In this embodiment, the width of the cross section of the first mounting groove 220 gradually decreases from the inner end of the first mounting groove 220 to the outer end of the first mounting groove 220.
Through the structure of the first mounting groove 220 in this embodiment, after the first sealing ring 210 is placed in the first mounting groove 220, the outer end of the first mounting groove 220 will clamp the first sealing ring 210 in a clamping manner, so as to further improve the stability of the first sealing ring 210 in the first mounting groove 220 in a fixed manner, and avoid the first sealing ring 210 from falling off.
In this embodiment, the first channel 110 further includes a first limiting portion 140 and a second limiting portion 150; the first limiting portion 140 and the second limiting portion 150 are disposed outside the first channel 110, the first limiting portion 140 and the second limiting portion 150 are disposed at an included angle, and two ends of the first limiting portion 140 and the second limiting portion 150, which are close to each other, are fixedly connected to the first channel 110;
a third limiting portion 160 is further disposed between the first limiting portion 140 and the second limiting portion 150, and one end of the third limiting portion 160 is fixedly connected with one end of the valve plate 130.
By the configuration in the present embodiment, one end of the third limiting portion 160 is fixedly connected to one end of the valve plate 130, so when the valve plate 130 rotates around the rotation shaft 112, the third limiting portion 160 rotates along with the valve plate 130, whereas when the third limiting portion 160 rotates around the rotation shaft 112, the valve plate 130 also rotates along with the third limiting portion 160.
Through the setting of first spacing portion 140 and second spacing portion 150, the rotation of third spacing portion 160 that can be preferred is spacing, because be the contained angle setting between first spacing portion 140 and the second spacing portion 150, so, the corresponding can only rotate in the contained angle scope between first spacing portion 140 and the second spacing portion 150 of third spacing portion 160 to make valve plate 130 only rotate in certain contained angle scope.
In this embodiment, the first limiting portion 140 is located between the second limiting portion 150 and the other end of the second channel 120, and when the third limiting portion 160 is located in a state of being limited by the second limiting portion 150, the valve plate 130 is attached to one end of the second channel 120, so as to realize blocking of the second channel 120 by the valve plate 130; when the third limiting portion 160 is in the state of being limited by the first limiting portion 140, the gap between the valve plate 130 and one end of the second channel 120 is in the maximum state, that is, the efficiency of discharging the material is the highest.
The first limiting part 140, the second limiting part 150 and the third limiting part 160 in the embodiment can further standardize the motion state of the valve plate 130, and can more conveniently control the rotation of the valve plate 130 through the third limiting part 160, so that the valve plate is convenient to use.
In this embodiment, the cover plate 170 is further included, and two ends of the cover plate 170 are detachably connected with the first limiting portion 140 and the second limiting portion 150, respectively.
Through the configuration in this embodiment, the cover plate 170 is fixedly connected with the first limiting portion 140 and the second limiting portion 150 through bolts, and correspondingly, a handle 171 is further disposed on the cover plate 170 in this embodiment, so as to facilitate the operation of the cover plate 170.
In the use process, a worker can detach the cover plate 170 from the first limiting part 140 and the second limiting part 150, so that the position of the third limiting part 160 inside is adjusted, and the position of the valve plate 130 is further adjusted; by connecting the cover plate 170 to the first and second limiting portions 140 and 150, entry of impurities such as dust can be prevented accordingly, and contamination of materials can be avoided.
In this embodiment, as shown in fig. 3, a second sealing ring 310 is disposed between the other end of the first limiting portion 140 and/or the other end of the second limiting portion 150 and the cover 170.
Through the setting of the second sealing ring 310 in this embodiment, when the cover plate 170 is fixed on the first limiting portion 140 and the second limiting portion 150, the cover plate 170 will squeeze the second sealing ring 310, so that the gap between the cover plate 170 and the first limiting portion 140 and/or the second limiting portion 150 is plugged by the second sealing ring 310, and impurities such as dust are further prevented from entering between the first limiting portion 140 and the second limiting portion 150, so that materials are polluted, and the sealing structure has a certain air tightness.
It should be noted that at least the following cases exist in the arrangement of the second seal ring 310:
1) The second seal ring 310 is only disposed on the first limiting portion 140;
2) The second seal ring 310 is only disposed on the second limiting portion 150;
3) The first limiting portion 140 and the second limiting portion 150 are both provided with a second sealing ring 310.
In the present embodiment, the second seal ring 310 is disposed in the manner described in 3), that is, the second seal ring 310 is disposed on each of the first limiting portion 140 and the second limiting portion 150.
It can be appreciated that the fixing manner of the second seal ring 310 on the first limiting portion 140 and the second limiting portion 150 may be an adhesive or other existing fixing manner, and in this embodiment, the second seal ring 310 adopts the same fixing manner as the first seal ring 210;
in more detail, the second mounting groove 320 is formed at the other end of the first limiting portion 140 and the other end of the second limiting portion 150, and the width of the cross section of the second mounting groove 320 gradually decreases from the inner end of the second mounting groove 320 to the outer end of the second mounting groove 320, so that the outer end of the second mounting groove 320 can clamp the second sealing ring 310 after the second sealing ring 310 is placed in the second mounting groove 320, thereby preventing the second sealing ring 310 from falling off.
In this embodiment, the third limiting portion 160 is provided with a weight 161.
Through the arrangement of the weight 161 in this embodiment, the total weight of the weight 161 and the third limiting portion 160 is greater than the weight of the valve plate 130, so that under the action of the weights of the weight 161 and the third limiting portion 160, the third limiting portion 160 drives the valve plate 130 to rotate through the rotating shaft 112, so that the third limiting portion 160 is always in a state of being limited by the second limiting portion 150, and the valve plate 130 is in a state of blocking the second channel 120.
In the use process, materials are continuously piled on the valve plate 130, and along with the continuous increase of the materials piled on the valve plate 130, when the weight of the valve plate 130 plus the materials on the valve plate 130 is gradually increased until the weight is larger than the weight of the third limiting part 160 plus the weight 161, the valve plate 130 and the third limiting part 160 rotate through the rotating shaft 112, so that the valve plate 130 rotates towards the direction far away from one end of the second channel 120, and the blanking is realized; after blanking, the weight of the valve plate 130 is smaller than the weights of the third limiting part 160 and the weight 161, so that at this time, the third limiting part 160 and the valve plate 130 are reversed through the rotating shaft 112, thereby blocking the second channel 120 by the valve plate 130 again.
It can be appreciated that the cover plate 170 is opened to replace the weight 161, and the bearing capacity of the valve plate 130 to materials can be changed by replacing the weight 161 with different weights, so that the materials with different weights can be fed according to actual needs.
In this embodiment, the other end of the third limiting portion 160 is provided with a third mounting groove 162, and the weight 161 is provided with a mounting hole 163, wherein the other end of the third limiting portion 160 is screwed with a fastening nut 164; the weight 161 is sleeved on the third mounting groove 162 through the mounting hole 163, and the fastening nut 164 is sleeved on the other end of the third limiting part 160, so that the fixed connection between the weight 161 and the third limiting part 160 is realized.
In this embodiment, an electromagnet 180 for attracting the weight 161 is disposed at the first limiting portion 140 and/or the second limiting portion 150.
Through the arrangement of the electromagnet 180 in the embodiment, after the corresponding electromagnet 180 is electrified, the weight 161 can be better absorbed, so that the weight 161 is absorbed on the first limit part 140 or the second limit part 150; in this embodiment, the weight 161 is made of iron.
It should be noted that, the following at least several situations exist in the arrangement of the electromagnet 180:
1) The electromagnet 180 is only arranged on the first limiting part 140;
2) The electromagnet 180 is only arranged on the second limiting part 150;
3) The first and second limiting portions 140 and 150 are provided with electromagnets 180.
In the present embodiment, the electromagnet 180 is provided in the manner described in 3) above, that is, the electromagnet 180 is provided on each of the first and second stopper portions 140 and 150.
When the electromagnetic valve is further used, after the electromagnet 180 on the first limiting part 140 is electrified, the weight 161 is adsorbed at the first limiting part 140, so that the valve plate 130 is always positioned at a position far away from one end of the second channel 120, and the material is always discharged; when the electromagnet 180 on the second limiting portion 150 is energized, the weight 161 is adsorbed at the second limiting portion 150, so that the valve plate 130 always keeps blocking one end of the second channel 120.
In this embodiment, the valve plate 130 is in a rotational fit with the first channel 110 via a tetrafluoro bearing 230.
Through the arrangement of the tetrafluoro bearing 230 in this embodiment, one end of the valve plate 130 is sleeved on the rotating shaft 112 through the tetrafluoro bearing 230, so that the rotation connection between the valve plate 130 and the rotating shaft 112 can be better realized, and the friction force is reduced.
Further, in this embodiment, a self-turning flap valve for powder or granule blanking includes at least the following cases during operation:
1. the host device and the collecting device are both in a vacuum state or a normal pressure state, namely, the inside of the self-turning flap valve is in the vacuum state or the normal pressure state, the air pressures at two sides of the valve plate 130 are the same, the valve plate 130 is in a closed state, at the moment, the host device continuously stacks materials on the valve plate 130, when the materials stacked on the valve plate 130 reach a certain amount, the weight of the materials added on the valve plate 130 is larger than that of the third limiting part 160 and the weight 161, the valve plate 130 rotates, the materials stacked on the valve plate 130 are naturally discharged, the discharging of the materials is completed, and then the weight of the valve plate 130 is smaller than that of the third limiting part 160 and the weight 161, and the valve plate 130 is reversed, so that the second channel 120 is plugged;
in the blanking process, if the valve plate 130 is required to be kept normally open, the electromagnet 180 on the first limiting part 140 is electrified, and at the moment, the weight 161 is adsorbed at the first limiting part 140, so that the normally open state of the valve plate 130 is maintained;
if the valve plate 130 is required to be kept normally closed, the electromagnet 180 on the second limiting portion 150 is energized, and at this time, the weight 161 is adsorbed at the second limiting portion 150, thereby keeping the normally closed state of the valve plate 130.
2. The host device is in a vacuum state, and the collecting device is in a venting state, that is, the air pressure of the valve plate 130 relative to the side of the second channel 120 is smaller than the air pressure of the valve plate 130 relative to the side of the first channel 110, at this time, under the action of the air pressure and the weight 161, the valve plate 130 keeps blocking the second channel 120, the material can only be continuously deposited on the valve plate 130, and when the valve plate 130 is vacuumized relative to the side of the first channel 110, the situation in the above 1 is restored.
In summary, the foregoing description is only of the preferred embodiments of the present utility model, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the utility model.
Claims (9)
1. A turn over formula flap valve certainly for powder unloading, its characterized in that: comprising the steps of (a) a step of,
the device comprises a first channel and a second channel, wherein one end of the first channel is coated outside one end of the second channel;
the valve plate is arranged in the first channel, and one end of the valve plate is rotatably connected to the first channel;
in a closed state, the valve plate is attached to one end of the second channel;
the first channel further comprises a first limiting part and a second limiting part; the first limiting part and the second limiting part are arranged outside the first channel, the first limiting part and the second limiting part are arranged at an included angle, and one ends of the first limiting part and the second limiting part, which are close to each other, are fixedly connected to the first channel;
and a third limiting part is further arranged between the first limiting part and the second limiting part, and one end of the third limiting part is fixedly connected with one end of the valve plate.
2. A self-turning flap valve for powder and granular material blanking as set forth in claim 1, wherein: one end of the second channel is provided with a first sealing ring extruded with the valve plate.
3. A self-turning flap valve for powder and granular material blanking as set forth in claim 2, wherein: a first mounting groove is formed in one end of the second channel; the first sealing ring is fixedly connected in the first mounting groove.
4. A self-turning flap valve for powder or granular material blanking as set forth in claim 3, wherein: the width of the cross section of the first mounting groove gradually decreases from the inner end of the first mounting groove to the outer end of the first mounting groove.
5. A self-turning flap valve for powder and granular material blanking as set forth in claim 1, wherein: the novel anti-theft device comprises a first limiting part and a second limiting part, and is characterized by further comprising a cover plate, wherein two ends of the cover plate are detachably connected with the first limiting part and the second limiting part respectively.
6. A self-turning flap valve for powder and granular material blanking as set forth in claim 5, wherein: and a second sealing ring is arranged between the other end of the first limiting part and/or the other end of the second limiting part and the cover plate.
7. A self-turning flap valve for powder and granular material blanking as set forth in claim 1, wherein: and the third limiting part is provided with a weight.
8. A self-turning flap valve for powder and granular material blanking as set forth in claim 7 wherein: and an electromagnet for adsorbing the weight is arranged at the first limiting part and/or the second limiting part.
9. A self-turning flap valve for powder and granular material blanking as set forth in claim 1, wherein: the valve plate is in rotary fit with the first channel through a tetrafluoro bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320568436.5U CN220016188U (en) | 2023-03-22 | 2023-03-22 | Self-turning flap valve for powder discharging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320568436.5U CN220016188U (en) | 2023-03-22 | 2023-03-22 | Self-turning flap valve for powder discharging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220016188U true CN220016188U (en) | 2023-11-14 |
Family
ID=88673512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320568436.5U Active CN220016188U (en) | 2023-03-22 | 2023-03-22 | Self-turning flap valve for powder discharging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220016188U (en) |
-
2023
- 2023-03-22 CN CN202320568436.5U patent/CN220016188U/en active Active
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