CN217703871U - U-shaped fiber reinforced composite beam permanent template prefabricating mold - Google Patents
U-shaped fiber reinforced composite beam permanent template prefabricating mold Download PDFInfo
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- CN217703871U CN217703871U CN202221294201.3U CN202221294201U CN217703871U CN 217703871 U CN217703871 U CN 217703871U CN 202221294201 U CN202221294201 U CN 202221294201U CN 217703871 U CN217703871 U CN 217703871U
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Abstract
The utility model provides a U-shaped fiber reinforced composite beam permanent template prefabricating mold, which comprises a bottom plate, an inner layer mold, an outer layer moving mold, an inner layer U-shaped plug used for being sleeved outside two ends of the inner layer mold and an outer layer U-shaped plug used for being sleeved outside the inner layer U-shaped plug, wherein the plate thickness of the inner layer U-shaped plug is consistent with the thickness of an inner layer cement-based composite material layer, and the plate thickness of the outer layer U-shaped plug is consistent with the thickness of an outer layer cement-based composite material layer; the bottom plate is provided with a positioning member for fixing the inner layer mold and a fixing member for fixing the outer layer moving mold which moves outwards; the bottom plate, the inner layer mold, the outer layer moving mold and the inner layer U-shaped plug/the outer layer U-shaped plug form a U-shaped cavity. Adopt the technical scheme of the utility model, mould simple structure has solved among the composite material fibre dispersion inhomogeneous, has pour incompact and fibre net and has consolidated the restriction scheduling problem of the number of piles, the life cycle of multiplicable structure.
Description
Technical Field
The utility model relates to a prefabricated mould technical field of building especially relates to a permanent template prefabricated mould of U type fibre reinforced composite roof beam.
Background
With the wide application of reinforced concrete structures in buildings, bridges and marine structures, pebble, river sand and fresh water resources adopted by concrete gradually become scarce, so that the construction cost is greatly increased, and the geological conditions on land become worse and worse. Therefore, many scholars adopt seawater and sea sand to replace fresh water and river sand so as to relieve the problem of resource scarcity. However, seawater and sea sand contain a large amount of SO4-2, cl-and the like with negative ions with an erosion effect, and the corrosion degree of a poured reinforced concrete structure is far greater than that of fresh water river sand reinforced concrete, SO that the strength and the rigidity of the structure are rapidly reduced. Therefore, in order to alleviate the decrease of mechanical properties due to corrosion of members, domestic and foreign researchers have developed and researched various reinforcement technologies, in which Fiber Reinforced Plastic (FRP) is attached as a commonly used reinforcement means and has good durability.
The FPR has the characteristics of high specific strength, good corrosion resistance, thermal expansion coefficient similar to that of concrete and the like, so that the FPR is widely applied to the fields of reinforcing civil buildings, bridges, ocean structures and the like. Although the FRP material has the capability of resisting various environments in a short period, due to the complexity and diversity of practical application environments, and under the action of long-term load and severe environment after the FRP reinforced structure is in a reinforced state, the matrix material epoxy resin is easy to degrade due to high temperature or low temperature, so that the bonding force between the FRP material and the concrete is weakened, and the coordination working capability between the two materials is reduced. In addition, the further corrosion and aging of the reinforcing steel bars in the reinforced concrete cannot be prevented by simple structural reinforcement, the bearing capacity and rigidity of the structure are continuously reduced, and the problem of durability of the structure is not completely solved. The impressed current cathodic protection technology forms a closed circuit with the reinforcing steel bars through an external power supply and an auxiliary anode material, can effectively protect the reinforcing steel bars in the reinforced concrete from erosion of negative ions such as Cl & lt- & gt, and avoids further corrosion of the reinforcing steel bars. Therefore, the durability and the corrosion resistance of the reinforced concrete structure can be effectively improved by combining the structure reinforcing technology and the impressed current cathodic protection technology.
The above-mentioned problems of corrosion and durability of the steel reinforcement not only cause the strength and rigidity degradation of the built structure, but also are the design problems of the life-cycle of the newly built structure which need to be considered. In order to solve the problem of durability of the reinforced concrete structure from the root, a technology which can play a protective role when the building is in service needs to be developed and researched.
SUMMERY OF THE UTILITY MODEL
To above technical problem, the utility model discloses a prefabricated mould of permanent template of U type fibre reinforced composite roof beam has solved among the cement base combined material fibre dispersion inhomogeneous, has pour uncompacted problem, has avoided the fibre of doping among the cement base combined material to hang on fibre net, and the permanent template that the production obtained has good anti crack, electrically conducts and anti erosion capacity.
To this end, the utility model discloses a technical scheme do:
the U-shaped fiber reinforced composite beam permanent template prefabricating mold comprises an inner cement-based composite material layer, an outer cement-based composite material layer and fiber grids, wherein the fiber grids are positioned between the inner cement-based composite material layer and the outer cement-based composite material layer;
the U-shaped fiber reinforced composite beam permanent template prefabricating mould comprises a bottom plate, an inner layer mould, an outer layer moving mould, inner layer U-shaped plugs and outer layer U-shaped plugs, wherein the inner layer U-shaped plugs are used for being sleeved outside two ends of the inner layer mould, the outer layer U-shaped plugs are used for being sleeved outside the inner layer U-shaped plugs, the thickness of a plate of each inner layer U-shaped plug is consistent with that of the inner layer cement-based composite layer, and the thickness of a plate of each outer layer U-shaped plug is consistent with that of the outer layer cement-based composite layer;
the outer layer moving die comprises two die plates which are respectively positioned at the front side and the rear side of the inner layer die;
the bottom plate is provided with a positioning component for fixing the inner layer mold and a fixing component for fixing the outer layer moving mold moving outwards, the inner diameter of the inner layer U-shaped plug is consistent with the width of the inner layer mold, and the inner diameter of the outer layer U-shaped plug is matched with the outer diameter of the inner layer U-shaped plug;
the bottom plate, the inner layer mold, the outer layer moving mold and the inner layer U-shaped plug/the outer layer U-shaped plug form a U-shaped cavity. And after the cement-based composite material is poured into the U-shaped cavity, the outer-layer moving mold is moved outwards, and the bottom plate, the inner-layer cement-based composite material layer, the outer-layer moving mold and the outer-layer U-shaped plug form another U-shaped cavity.
Adopt this technical scheme, through the bottom plate, the inlayer mould, the outer mould that removes, the equipment of each part such as inlayer U type end cap and outer U type end cap can obtain the detachable mould, pour cement base combined material to U type cavity and can obtain inlayer cement base combined material layer, remove the outer mould that removes, after the fibre net is installed, install outer U type end cap, make inlayer cement base combined material layer, the outer mould that removes, form second U type cavity between the outer U type end cap, pour cement base combined material to second U type cavity and can with inlayer cement base combined material layer, the outer cement base combined material layer that the fibre net links together. The mold has simple structure, convenient operation and low cost; and the obtained template has good durability and corrosion resistance.
As the utility model discloses a further improvement, the inlayer mould includes that two C type templates are assembled and are formed, gap between the concatenation of C type template adopts foamer or rubber to fill, the fixed die plate of C type template's bottom for the enstrophe, the bottom is equipped with the bolt hole, can be connected with the bottom plate through the bolt. By adopting the technical scheme, the installation and the disassembly are convenient, and the cost is low. Furthermore, both ends of the C-shaped template are provided with positioning holes, so that the U-shaped plugs of the inner layer can be conveniently installed and fixed. Further, the C-shaped template is a C-shaped steel plate.
As a further improvement of the present invention, the positioning member includes a circular positioning hole.
As a further improvement, the fixing member comprises a long strip-shaped fixing hole, the outer moving mold can move in the long strip-shaped fixing hole according to the cement-based thickness, and the bolt is adopted for fixed connection. By adopting the technical scheme, the installation is convenient, the movement is convenient, and the dislocation is not easy to occur.
As a further improvement of the utility model, the two sides of the inner layer U-shaped plug are provided with connecting holes for fixedly connecting with the inner layer mold, and the two sides of the outer layer U-shaped plug are provided with connecting holes for connecting with the inner layer U-shaped plug; two sides of the inner layer U-shaped plug are fixedly connected with the inner layer die through connecting members, and two sides of the outer layer U-shaped plug are connected with the inner layer U-shaped plug through connecting pieces; therefore, the two layers of plugs can fix fiber grids and adopt bolts for pre-tightening and tensioning besides preventing slurry leakage and controlling the thickness of the inner cement-based composite material layer and the outer cement-based composite material layer.
As a further improvement, the connecting holes are bolt holes. The connecting member and the connecting member may be bolts.
As the utility model discloses a further improvement, the outer mould that removes includes two L type templates, and is further, L type template is equipped with the stiffening rib, can ensure that the mould has sufficient rigidity. Wherein the L-shaped template is an L-shaped steel plate.
As a further improvement, the bottom of the L-shaped form is provided with bolt holes connected to the fixing members of the bottom plate, so as to be conveniently connected and fixed to the bottom plate.
As a further improvement of the utility model, the bottom of the L-shaped template is connected with the fixing component of the bottom plate through bolts.
As a further improvement, the inner layer U-shaped plug is a U-shaped steel plate, and the inner size of the inner layer U-shaped plug is the same as the outer size of the inner layer die.
As a further improvement, the structure of the outer U-shaped plug is consistent with that of the inner U-shaped plug, and the inner size of the outer U-shaped plug is the same as that of the inner U-shaped plug.
As a further improvement, the prefabricated mould of the permanent template of U type fiber reinforced composite beam include and be used for preventing to damage inlayer cement base combined material layer or cause the supplementary steel sheet of pouring that fibre net shifted when pouring and form outer cement base combined material layer. The auxiliary casting steel plate is an auxiliary tool used in the casting process.
Compared with the prior art, the beneficial effects of the utility model are that:
first, adopt the utility model discloses a prefabricated mould can easily satisfy the production demand of the permanent template of roof beam of different thickness, the number of piles and length, has solved among the cement base combined material fibre dispersion inhomogeneous, has pour uncompacted problem, can avoid the fibre of doping among the cement base combined material to hang on fibre net, and the permanent template that the production obtained has good anti crack, electrically conductive and anti erosion capacity. Meanwhile, the problem of durability of the reinforced concrete structure is solved fundamentally, and the obtained fiber reinforced cement-based composite material permanent template can be used as a structural external reinforcing material and an auxiliary anode material of an impressed current cathodic protection technology. In addition, the use of the fiber reinforced cement-based composite material permanent template obtained by adopting the prefabricated mould can save the consumption of the template, the template and concrete form a combined structure after construction, the combined structure is stressed together, the effect of improving the durability of the structure can be played from the initial use stage of the structure, and the service life of the structure is prolonged.
Second, adopt the technical scheme of the utility model, mould simple structure, easy installation is with low costs moreover.
Drawings
Fig. 1 is the structural schematic diagram of the U-shaped fiber reinforced cement-based composite beam permanent formwork preparation mold of the embodiment of the present invention after being assembled.
Fig. 2 is a top view of a base plate according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an inner layer mold according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an inner layer U-shaped plug according to an embodiment of the present invention.
Fig. 5 is the utility model discloses bottom plate, inlayer mould and inlayer U type end cap assemble the schematic diagram.
Fig. 6 is a schematic structural view of the outer layer moving mold according to the embodiment of the present invention.
Fig. 7 is the utility model discloses die assembly schematic diagram when inlayer cement based composite pours.
Fig. 8 is a schematic structural view of an outer U-shaped plug according to an embodiment of the present invention.
Fig. 9 is the utility model discloses supplementary steel sheet of pouring's schematic structure view.
The reference numerals include:
1-a bottom plate, 2-an inner layer mold, 3-an outer layer moving mold, 4-an inner layer U-shaped plug, 5-an outer layer U-shaped plug, 6-an auxiliary pouring steel plate and 7-bolts;
11-positioning hole, 12-fixing hole;
21-C type steel plate, 22-bottom plate connecting hole and 23-plug connecting hole;
31-L-shaped steel plate, 32-stiffening rib and 33-bolt hole;
41-connecting hole.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
The permanent U-shaped fiber reinforced cement-based composite beam template comprises an inner layer of cement-based composite material, an outer layer of cement-based material and a fiber grid, wherein the fiber grid is positioned between the inner layer of cement-based composite material and the outer layer of cement-based material.
As shown in fig. 1, this embodiment provides a preparation mold for preparing the permanent template of the U-shaped fiber reinforced cement-based composite beam, where the preparation mold includes a bottom plate 1, an inner layer mold 2, an outer layer moving mold 3, an auxiliary pouring steel plate 6, an inner layer U-shaped plug 4, and an outer layer U-shaped plug 5. The bottom plate 1 is respectively provided with a positioning hole 11 of the inner layer mold 2 and a fixing hole 12 of the outer layer moving mold 3, wherein the fixing hole 12 of the outer layer moving mold 3 is a long round hole, and the outer layer moving mold 3 can be freely fixed according to the thickness and layer number requirements of the cement-based composite material, as shown in fig. 2. In addition, the positioning hole 11 is provided with threads, the inner layer die 2 can be fixedly connected by using the bolt 7, and the outer layer moving die 3 is fixedly connected by using the high-strength bolt 7 and a nut.
Specifically, as shown in fig. 3, the inner layer die 2 is composed of two C-shaped steel plates 21, the lower parts of the C-shaped steel plates 21 are provided with inward-turned fixing steel plates, bottom plate connecting holes 22 are formed in the fixing steel plates, the two C-shaped steel plates 21 are assembled into the inverted U-shaped inner layer die 2, and a middle gap is filled with foaming agent or rubber so as to facilitate the die removal work after the permanent template of the U-shaped fiber reinforced cement-based composite beam is formed; meanwhile, plug connecting holes 23 are formed in the two ends of the inner layer die 2, so that the inner layer U-shaped plug 4 and the outer layer U-shaped plug 5 can be conveniently fixed.
As shown in fig. 4, the inner U-shaped plug 4 is a U-shaped steel plate, the inner dimension of the U-shaped plug is the same as the outer dimension of the inner mold 2, the thickness of the U-shaped plug is the same as that of the inner cement-based composite material, and the two sides of the inner U-shaped plug 4 are provided with connecting holes 41 fixed with the inner mold 2; the inner U-shaped plugs 4 are nested at two ends of the inner mold 2, so that slurry leakage at two ends is prevented, and the pouring thickness of the cement-based composite material can be controlled, as shown in fig. 5.
As shown in fig. 6, the outer layer moving mold 3 includes two L-shaped steel plates 31 located at the front and rear sides of the inner layer mold 2, the L-shaped steel plates 31 are provided with stiffening ribs 32 to ensure sufficient rigidity of the mold, and the bottom of the L-shaped steel plates 31 are provided with bolt holes 33 to facilitate connection and fixation with the base plate 1. As shown in fig. 7, the outer layer moving mold 3, the inner layer plug and the inner layer mold 2 form a U-shaped cavity, and the inner layer cement-based composite material is poured.
As shown in fig. 8, the outer layer U-shaped plug 5 and the inner layer U-shaped plug 4 have the same structure, the inner size of the outer layer U-shaped plug 5 is the same as the outer size of the inner U-shaped plug, and the thickness of the outer layer U-shaped plug is the same as the thickness of the outer layer cement-based composite material. Meanwhile, the side surfaces of the outer layer U-shaped plug 5 and the inner layer U-shaped plug 4 are provided with connecting holes 41 for fixing, besides preventing slurry leakage and controlling the pouring thickness of the cement-based composite material, a fiber grid can be fixed between the outer layer U-shaped plug 5 and the inner layer U-shaped plug 4, and bolts 7 are adopted for pre-tightening and tensioning, as shown in fig. 1.
As shown in fig. 9, the auxiliary cast steel plate 6 is a 2mm thick steel plate in this embodiment. The auxiliary pouring steel plate 6 is used in the following mode: and after the outer layer U-shaped plug 5 is installed, the outer layer moving mold 3 is moved inwards again to form a second layer U-shaped cavity together with the inner layer mold 2 and the outer layer U-shaped plug 5, and the cement-based composite material is poured. In the pouring process, the auxiliary pouring template is tightly attached to the inner-layer cement-based composite material, and is lifted while pouring, so that the inner-layer cement-based composite material is enabled to be subjected to vertical uniform pressure of cement slurry, the shearing force applied to the inner-layer cement-based composite material is reduced, the fiber grids are prevented from moving, the obtained beam permanent template is integrally formed, and the cement base and the fiber grids, and the cement base have good interface performance.
The method for preparing the permanent U-shaped fiber reinforced cement-based composite beam template by adopting the die comprises the following steps:
(1) Splicing 2 inner-layer C-shaped steel plates, fixing the inner-layer C-shaped steel plates on a bottom plate by bolts, and blocking gaps between the inner-layer C-shaped steel plates and the bottom plate by foaming agents or rubber to prevent slurry leakage to obtain an inner-layer die;
(2) After the inner layer mold is assembled, fixing the inner layer U-shaped plugs at two ends of the inner layer mold, and then uniformly coating a release agent on the outer side of the inner layer mold and the inner side of the inner layer U-shaped plugs;
(3) The outer layer moving die is fixed on the bottom plate through the fixing hole of the outer layer moving die by adopting a fixing bolt, a U-shaped cavity is formed by the outer layer moving die, the inner layer die and the inner layer U-shaped plug, and then a release agent is uniformly smeared on the inner side of the outer layer moving die.
And then, fixing a layer of plastic film on the inner surface of the outer layer moving mold, and uniformly coating a release agent on the surface of the plastic film. Because the outer layer moving mould needs to move outwards when the cement base is initially set, in order to prevent the cement base from collapsing caused by demoulding, a layer of plastic film is covered on the mould, so that demoulding can be conveniently carried out when the cement base is initially set.
(4) And (3) tightly attaching the auxiliary pouring steel plate to the plastic film, pouring the cement-based composite material and lifting the steel plate at the same time so as to reduce the shearing force applied to the plastic film and prevent the plastic film from being damaged. In the pouring process, continuously vibrating to ensure the pouring compactness, and finally pouring to obtain a member formed by the inner-layer cement-based composite material;
(5) After the inner-layer cement-based composite material is poured, after the cement-based composite material is initially set (about 1 hour), the outer-layer movable mold fixing bolt is disassembled, the outer-layer movable mold is moved outwards, and the plastic film on the inner-layer cement-based composite material is removed. Then, the fiber grids are laid on the surface of the inner cement-based composite material, the fiber grids are compressed by a pressing plate and are embedded into the cement-based composite material, a strong bonding effect is guaranteed between the fiber grids and the cement-based composite material, the length of the fiber grids is larger than that of an inner layer mold, then the redundant fiber grids on the two sides are laid on the inner layer U-shaped plug, the outer layer U-shaped plug is sleeved, and the outer layer U-shaped plug is fixed and compressed by bolts to prevent the fiber grids from shifting.
(6) And uniformly coating a release agent on the inner side of the outer layer U-shaped plug, and then fixing the outer layer movable mould on the fixing hole of the bottom plate again to ensure that the outer layer movable mould, the inner layer cement-based composite material and the outer layer U-shaped plug form a second U-shaped cavity.
(7) And placing the auxiliary pouring steel plate close to the inner cement-based composite material, pouring the outer cement-based composite material as soon as possible, and lifting the steel plate while pouring the cement base so as to reduce the shearing force applied to the fiber grids and prevent the fiber grids from shifting. The in-process of pouring, constantly vibrate, guarantee to pour closely knit degree, this construction mode can ensure permanent template integrated into one piece of roof beam, and the time difference is less for pouring with outer cement base to inlayer cement base, can guarantee not have weak interface between the outer cement base of inlayer, makes permanent template's wholeness can be better.
(8) And (3) pasting a preservative film on the sample, then placing the sample in a cool place indoors for hardening, and removing the die after 48 hours. Firstly, the outer layer moving mold is dismantled, then the inner layer U-shaped plug and the outer layer U-shaped plug are dismantled, then the foaming agent or rubber in the middle of the inner layer mold is dismantled, and finally the inner layer mold is dismantled.
(9) Trimming redundant fiber grids to be flush with the cement-based composite material, covering the sample with a preservative film, and naturally curing for 28 days to finish the prefabrication of the permanent U-shaped beam template.
(10) And cleaning the disassembled inner layer mold, the outer layer moving mold, the inner layer U-shaped plug, the outer layer U-shaped plug, the bottom plate and the like so as to be reused.
The foregoing is a more detailed description of the present invention, taken in conjunction with specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments thereof. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (9)
- The permanent template prefabrication mould of U type fibre reinforced composite beam, its characterized in that: the permanent template of the U-shaped fiber reinforced composite beam comprises an inner cement-based composite material layer, an outer cement-based composite material layer and fiber grids, wherein the fiber grids are positioned between the inner cement-based composite material layer and the outer cement-based composite material layer;the U-shaped fiber reinforced composite beam permanent template prefabricating mould comprises a bottom plate, an inner layer mould, an outer layer moving mould, inner layer U-shaped plugs and outer layer U-shaped plugs, wherein the inner layer U-shaped plugs are used for being sleeved outside two ends of the inner layer mould, the outer layer U-shaped plugs are used for being sleeved outside the inner layer U-shaped plugs, the thickness of a plate of each inner layer U-shaped plug is consistent with that of the inner layer cement-based composite layer, and the thickness of a plate of each outer layer U-shaped plug is consistent with that of the outer layer cement-based composite layer;the outer layer moving die comprises two die plates which are respectively positioned at the front side and the rear side of the inner layer die;the bottom plate is provided with a positioning member for fixing the inner layer mold and a fixing member for fixing the outer layer moving mold moving outwards; the bottom plate, the inner layer mold, the outer layer moving mold and the inner layer U-shaped plug/the outer layer U-shaped plug form a U-shaped cavity.
- 2. The prefabricated U-shaped fiber reinforced composite beam permanent formwork mold according to claim 1, wherein: the inner layer die comprises two C-shaped die plates which are spliced, and gaps between the spliced C-shaped die plates are filled with foaming agents or rubber.
- 3. The prefabricated mould for the permanent template of the U-shaped fiber reinforced composite beam as claimed in claim 2, wherein: the positioning component comprises a circular positioning hole, and the C-shaped template is connected with the positioning hole of the bottom plate through a bolt.
- 4. The prefabricated mould for the permanent template of the U-shaped fiber reinforced composite beam as claimed in claim 3, wherein: the fixing member comprises a long-strip-shaped fixing hole, and the outer layer moving die is fixedly connected with the fixing hole through a bolt.
- 5. The prefabricated mould for the permanent template of the U-shaped fiber reinforced composite beam as claimed in claim 4, wherein: and connecting holes for being fixedly connected with the inner layer mold are formed in two sides of the inner layer U-shaped plug, and connecting holes for being connected with the inner layer U-shaped plug are formed in two sides of the outer layer U-shaped plug.
- 6. The prefabricated mould for the permanent template of the U-shaped fiber reinforced composite beam as claimed in claim 2, wherein: the outer layer moving die comprises two L-shaped die plates.
- 7. The prefabricated mould for the permanent template of the U-shaped fiber reinforced composite beam as claimed in claim 6, wherein: the L-shaped template is provided with a stiffening rib.
- 8. The prefabricated mould for the permanent template of the U-shaped fiber reinforced composite beam as claimed in claim 6, wherein: the bottom of the L-shaped template is provided with a bolt hole connected with a fixing component of the bottom plate; the bottom of the L-shaped template is connected with the fixing component of the bottom plate through a bolt.
- 9. The prefabricated U-shaped fiber reinforced composite beam permanent formwork mold according to any one of claims 1 to 8, characterized in that: the auxiliary pouring steel plate is used for preventing the inner cement-based composite material layer from being damaged or causing fiber grids to be displaced when the outer cement-based composite material layer is formed by pouring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221294201.3U CN217703871U (en) | 2022-05-27 | 2022-05-27 | U-shaped fiber reinforced composite beam permanent template prefabricating mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221294201.3U CN217703871U (en) | 2022-05-27 | 2022-05-27 | U-shaped fiber reinforced composite beam permanent template prefabricating mold |
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| CN217703871U true CN217703871U (en) | 2022-11-01 |
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| CN202221294201.3U Active CN217703871U (en) | 2022-05-27 | 2022-05-27 | U-shaped fiber reinforced composite beam permanent template prefabricating mold |
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- 2022-05-27 CN CN202221294201.3U patent/CN217703871U/en active Active
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