CN217897274U - Construction device for reinforcing inner side of silo - Google Patents
Construction device for reinforcing inner side of silo Download PDFInfo
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- CN217897274U CN217897274U CN202221867291.0U CN202221867291U CN217897274U CN 217897274 U CN217897274 U CN 217897274U CN 202221867291 U CN202221867291 U CN 202221867291U CN 217897274 U CN217897274 U CN 217897274U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/51—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for storing agricultural or horticultural products
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Abstract
The utility model relates to a silo construction technical field especially relates to a reinforced (rfd) construction equipment of silo inboard, include: a load bearing assembly; the repairing template assembly is arranged below the bearing assembly and comprises a supporting frame, and a first telescopic oil cylinder which is telescopic in the horizontal direction is arranged on the supporting frame; the side template is fixed on a piston rod of the first telescopic oil cylinder and is vertically arranged in parallel with the inner wall of the silo; the bottom formwork is horizontally fixed to the bottoms of the side formworks, the first telescopic oil cylinder drives the side formworks and the bottom formwork to move in the direction of the inner wall of the silo until the bottom formwork is in close contact with the inner wall of the silo, the side formworks, the bottom formwork and the inner wall of the silo form a repairing space, concrete is poured in the repairing space to reinforce the inner wall of the silo, construction operation is simple and convenient, construction materials in an upper construction area can be dragged in the construction process, influence on lower equipment is small, construction efficiency is improved, and cost is reduced.
Description
Technical Field
The utility model relates to a silo construction technical field especially relates to a construction equipment of inboard reinforcement of silo.
Background
After the construction of the concrete circular silo is completed, relevant equipment is installed inside the silo. When the strength of the silo is found to have defects and needs to be reinforced, due to the fact that the related equipment is difficult to dismantle, construction parts are easy to fall off when the silo is directly constructed on the inner wall of the silo, equipment is damaged, and maintenance and construction are difficult.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists among the above-mentioned prior art, the utility model provides a construction equipment of inboard reinforcement of silo that structural design is reasonable, construction operation is simple and convenient.
The utility model provides an inboard reinforced (rfd) construction equipment of silo, include:
the bearing assembly is arranged at the opening at the top of the silo;
the repairing template component is arranged below the bearing component and used for reinforcing the inner side of the silo;
the repair template assembly comprises
The supporting frame is fixedly connected with the bearing assembly, and a first telescopic oil cylinder which is telescopic in the horizontal direction is arranged on the supporting frame;
the side templates are fixed on a piston rod of the first telescopic oil cylinder, and are vertically arranged in parallel to the inner wall of the silo;
the bottom templates are the same as the side templates in number and are horizontally fixed at the bottoms of the side templates,
the first telescopic oil cylinder drives the side templates and the bottom template to move towards the inner wall direction of the silo until the bottom template is in close contact with the inner wall of the silo, the side templates, the bottom template and the inner wall of the silo form a repair space, and concrete is poured in the repair space to reinforce the inner wall of the silo.
In the technical scheme, the construction device for reinforcing the inner side of the silo is used, when reinforcing construction is carried out on the inner side of the silo, relevant equipment in the installed silo does not need to be dismantled, construction operation is simple and convenient, construction materials in an upper construction area can be dragged in the construction process, the influence on lower equipment is small, construction efficiency is improved, and cost is reduced.
In some embodiments of this application, the side form board be with the silo vertical arc panel that sets up with heart, the die block board be with the bottom surface of silo horizontal arc panel that sets up with heart, the die block board with the side form board is detachable and connects.
In some embodiments of the present application, the support frame includes a lateral support tube, a vertical support tube, and an inclined tube for increasing strength;
the transverse supporting tube comprises an outer tube and an inner tube, the inner tube is sleeved inside the outer tube, a slide way is arranged on the inner wall of the outer tube, and a sliding block is correspondingly arranged on the outer wall of the inner tube, so that the inner tube can slide along the length direction of the outer tube.
In some embodiments of the present application, a cylinder barrel of the first telescopic cylinder is fixed on the outer tube, and a piston rod of the first telescopic cylinder is fixedly connected with the side form; the outer end of the inner pipe is fixed with the side die plate so as to improve the stability of the side die plate during moving.
In some embodiments of the present application, the load bearing assembly comprises:
at least two bearing cross beams which are fixed on the top opening of the silo in parallel;
the at least two second telescopic oil cylinders are vertically fixed on the bearing cross beam;
the upper end of the lifting pipe is connected with the second telescopic oil cylinder, and the lower end of the lifting pipe is fixedly connected with the support frame of the repair template assembly;
the lifting pipe is driven to lift through the extension of the second telescopic oil cylinder, so that the repairing template assembly is driven to lift.
In some embodiments of the present application, in order to form a complete closed-loop structure in the repair space, a second side template is disposed between two adjacent side templates, and a second bottom template is disposed between two adjacent bottom templates;
the second side template is an arc-shaped plate which is vertically arranged; the second bottom template is an arc-shaped plate horizontally arranged.
In some embodiments of this application, be provided with the orthographic projection shape on the both sides terminal surface of side form board and be trapezoidal protruding slider, second side form board with all be provided with the slide rail on two side terminal surfaces that the side form board docks, the slide rail is the trapezoidal groove structure for the orthographic projection shape, the slide rail with the shape looks adaptation of protruding slider.
In some embodiments of the application, the end surfaces of the bottom formwork and the second bottom formwork, which are close to the inner wall of the silo, are provided with the sealing strips, so that when the repairing space at the bottommost layer is constructed, the bottom formwork and the second bottom formwork are tightly contacted with the inner wall of the silo, leakage is prevented when concrete is poured, and the reinforcing effect is prevented from being influenced.
Based on above-mentioned technical scheme, use the embodiment of the utility model provides an in the time of the inboard reinforced (rfd) construction equipment of silo consolidates the construction, need not to demolish the silo in that has installed relevant equipment, construction operation is simple and convenient, can drag the regional construction material of upper portion construction in the work progress, and is little to lower part equipment influence, has improved the efficiency of construction height, the cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a top view of a repair formwork assembly in an embodiment of the present invention placed in a silo;
FIG. 2 is a top view of an embodiment of the present invention with the load bearing assembly placed at the top opening of the silo;
fig. 3 is a schematic structural diagram of the first repair space constructed in the embodiment of the present invention;
fig. 4 is a schematic structural view illustrating the first reinforcing layer poured in the embodiment of the present invention;
FIG. 5 is a schematic top view of the bottom form in contact with the inner wall according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second repair space constructed in an embodiment of the present invention;
fig. 7 is a schematic structural view of pouring the second reinforcing layer in the embodiment of the present invention;
fig. 8 is a schematic structural view of the embodiment of the present invention in which a second side form plate is added between the side form plates and a second bottom form plate is added between the bottom form plates;
FIG. 9 is an enlarged view of portion A of FIG. 8;
in the figure, the position of the upper end of the main shaft,
10. a silo; 11. the top is open; 12. an inner wall; 20. repairing the template assembly; 21. a bottom template; 211. A projection; 22. a sideform; 221. a projecting slider; 23. a first telescopic cylinder; 24. a support frame; 241. a transverse supporting tube; 2411. an outer tube; 2412. an inner tube; 242. a vertical supporting tube; 243. an inclined tube; 25. a second side formwork; 251. a slide rail; 26. a second bottom form; 261. a groove; 30. a load bearing assembly; 31. a load-bearing beam; 32. a second telescopic cylinder; 33. lifting the pipe; 40. a first repair space; 41. a first reinforcing layer; 50. a second repair space; 51. and a second reinforcing layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to limit the invention to the precise embodiments disclosed. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 4, the construction device for reinforcing the inner side of a silo according to the embodiment includes:
a load bearing assembly 30 disposed at the top opening 11 of the silo 10;
the repair template component 20 is arranged below the bearing component 30 and used for reinforcing the inner side of the silo;
a repair template assembly 20 comprising
The supporting frame 24 is fixedly connected with the bearing component 30, and a plurality of first telescopic oil cylinders 23 which can be stretched in the horizontal direction are arranged on the supporting frame 24;
four side templates 22 are fixed on a piston rod of the first telescopic oil cylinder 23, and the side templates 22 are vertically arranged in parallel to the inner wall 12 of the silo;
the bottom templates 21 are the same as the side templates 22 in number, the bottom templates 21 are horizontally fixed at the bottoms of the side templates 22,
the first telescopic oil cylinder 23 drives the side templates 22 and the bottom template 21 to move towards the inner wall 12 of the silo 10 until the bottom template 21 is in close contact with the inner wall 12 of the silo, the side templates 22, the bottom template 21 and the inner wall 12 of the silo form a repair space, and concrete is poured in the repair space to reinforce the inner wall of the silo.
As shown in fig. 1, in the present embodiment, the repairing formwork assembly 20 includes four side formworks 22 and four bottom formworks 21, the side formworks 22 are quarter-circle arc-shaped plates concentrically arranged with the silo 10 and vertically arranged parallel to the silo inner wall 12; the bottom formwork 21 is horizontally fixed at the bottom of the side formwork 22 and is vertical to the side formwork 22, and the bottom formwork 21 is a quarter-circle horizontal arc-shaped plate which is concentrically arranged with the bottom surface of the silo. For the convenience of subsequent construction, the bottom formwork 21 and the side formwork 22 are detachably connected,
as shown in fig. 3, the support frame 24 of the repair template assembly 20 of the present application includes lateral support tubes 241, vertical support tubes 242, and inclined tubes 243 for increasing the strength of the repair template assembly;
the transverse support tube 241 includes an outer tube 2411 and an inner tube 2412, the inner tube 2412 is sleeved inside the outer tube 2411, a slide is disposed on the inner wall of the outer tube 2411, a slide block is correspondingly disposed on the outer wall of the corresponding inner tube 2412, and the inner tube 2412 can slide along the length direction of the outer tube 2411.
As shown in fig. 4, a cylinder barrel of the first telescopic cylinder 23 is fixed on the outer tube 2411, and a piston rod of the first telescopic cylinder 23 is fixedly connected with the back of the side template 22; the outer end of the inner tube 2412 is also fixed to the back of the sideform 22, which improves the stability of the sideform 22 during movement. In steps S2, S5, and S6, the first telescopic cylinder 23 drives the sideform 22 to extend or retract, and the inner tube 2412 slides along the outer tube 2411 to limit the movement track of the sideform 22, thereby improving the movement stability of the sideform 22.
Referring to fig. 2-3, the load bearing assembly 30 includes:
four bearing cross beams 31 are divided into two groups, and two bearing cross beams 31 are one group and are fixed on the top opening 11 of the silo 10 in parallel;
the four second telescopic oil cylinders 32 are vertically fixed on the bearing cross beams, two second telescopic oil cylinders are arranged on each group of bearing cross beams 31, and the extension directions of the second telescopic oil cylinders are vertically downward;
each second telescopic cylinder 32 is connected with one lifting pipe 33, the upper end of each lifting pipe 33 is connected with the second telescopic cylinder 32, and the lower end of each lifting pipe 33 is fixedly connected with the support frame 24 of the repair template assembly 20;
the lifting pipe 33 is driven to lift by the extension of the second telescopic oil cylinder 32, and the lifting pipe 33 drives the repairing template assembly 20 to lift to reach the construction height.
After the side formworks 22 are stretched in place, gaps exist between two adjacent side formworks 22, in order to enable the first repair space 40 and the second repair space 50 to be of a complete closed-loop structure and prevent leakage in the concrete pouring process, a second side formwork 25 is arranged between two adjacent side formworks 22, and a second bottom formwork 26 is arranged between two adjacent bottom formworks 21, in the embodiment, four second side formworks 25 and four second bottom formworks 26 are arranged;
the second side formwork 25 is an arc-shaped plate which is vertically arranged; the second bottom form 26 is an arc-shaped plate 26 which is horizontally arranged.
As shown in fig. 8-9, two side end surfaces of the sideform 22 are provided with protruding sliding blocks 221 with an orthographic projection shape being trapezoidal, two side end surfaces of the second sideform 25 in butt joint with the sideform 22 are provided with sliding rails 251, the sliding rails 251 are groove structures with an orthographic projection shape being trapezoidal, the sliding blocks 221 are adapted to the shapes of the sliding rails 251, and the orthographic projection profile area of the sliding rails 251 is slightly larger than the orthographic projection area of the sliding blocks 221, so that the sliding rails 251 can be smoothly in butt joint with the sliding blocks 221, the top ends of the sliding blocks 221 are lower than the sideform 22, and the bottom ends are flush with the bottom edges of the sideform 22. In order to firmly connect the bottom template 21 and the second bottom template 26, the two ends of the bottom template 21 are provided with protrusions 211 with trapezoidal orthographic projection shapes, the two ends of the second bottom template 26 are provided with grooves 261 with trapezoidal orthographic projection shapes, and the grooves 261 are matched with the shapes of the protrusions 211.
Sealing strips (not shown in the figure) are arranged on the end faces, close to the silo inner wall 11, of the bottom formwork 21 and the second bottom formwork 26, so that when the first repair space 40 is constructed, the bottom formwork 21 and the second bottom formwork 26 are tightly contacted with the silo inner wall 11, and leakage is prevented from occurring when concrete is poured, and the reinforcing effect is prevented from being influenced.
When the construction device for reinforcing the inner side of the silo of the embodiment is used for reinforcing the inner side of the silo, firstly, the repairing formwork assembly 20 is hoisted by using a crane and is placed into the silo 10 from the opening at the top of the silo 10, as shown in fig. 1; placing the load bearing assembly at the top opening 11 of the silo 10, as shown in fig. 2, and fastening the repair formwork assembly 20 with the silo 10 through the load bearing assembly 40; the second telescopic oil cylinder 32 of the bearing assembly 30 is used for adjusting the height of the repairing formwork assembly 20, and the repairing formwork assembly is moved to a designated construction height, as shown in fig. 3, then the first telescopic oil cylinder 23 is extended until the bottom formwork 21 is contacted with the inner wall 12 of the silo 10, and the bottom formwork 21, the side formworks 22 and the inner wall 12 of the silo 10 form a first repairing space 40 in the shape of an annular groove with an open top; building a temporary construction platform on the repair formwork assembly 20, performing bar planting construction and steel bar binding in the first repair space 40, and then pouring concrete to form a first reinforcing layer 41, as shown in fig. 4; when the concrete of the first reinforcing layer 41 reaches the form removal strength, the bottom form 21 is removed; then the first telescopic oil cylinder 32 is recovered, and the side template 22 moves towards the direction departing from the first reinforcing layer 41 and is separated from the first reinforcing layer 41; after the side templates 22 are separated from the first reinforcing layer 41, the second telescopic oil cylinder 32 contracts to drive the repairing template assembly 20 to lift a certain distance, the first telescopic oil cylinder extends again, the side templates 22 move towards the direction close to the inner wall 12 of the silo 10 again until the side templates 22 are closely contacted with the upper part of the outer side surface of the first reinforcing layer 31, and a second repairing space 50 is formed by the side templates 22, the top surface of the first reinforcing layer 31 and the inner wall 12 of the silo as shown in fig. 6; performing bar planting construction and bar binding in the second repair space 50, and then pouring concrete to form a second reinforcing layer 51, as shown in fig. 7; and repeating the steps until the reinforced concrete layer on the inner wall 12 of the silo 10 is completely constructed, and removing the repair template assembly 20.
And the first reinforcing layer 41 achieves the form removal strength, the second bottom formwork 26 is removed after the bottom formwork 21 is removed, then the second side formwork 25 is removed, and then the step S5 is carried out to move the side formwork 22 and separate the side formwork 22 from the first reinforcing layer.
The hoisting pipe 33 lifts the repairing formwork assembly 20 upwards, the side formworks 22 lift along with the hoisting pipe, when the lower ends of the side formworks 22 are lower than the top ends of the first reinforcing layers 41 by about 10cm, the second telescopic oil cylinders 32 stop recovering, the first telescopic oil cylinders 23 extend, the side formworks 22 move towards the direction close to the inner wall 12 of the silo 10 again until the side formworks 22 are in close contact with the upper portion of the outer side faces of the first reinforcing layers 31, then the second side formworks 25 are installed, and the side formworks 22, the top faces of the first reinforcing layers 31 and the inner wall 12 of the silo form a second repairing space 50.
When a repairing space is constructed, the second side formwork 25 is installed, the second side formwork 25 moves from top to bottom, the bottom of the second side formwork 25 enters a gap between two adjacent side formworks 22 and continues to move downwards, the bottom of the sliding rail 251 is firstly butted with the upper end of the sliding block 221, then the second side formwork 25 continues to move downwards, the sliding rail 251 moves downwards along the sliding block 221 until the bottom of the second side formwork 25 is flush with the bottom of the side formwork 22, and the second side formwork 25 is installed in place.
When the second side formwork 22 is dismantled, the second side formwork 25 is lifted upwards, the sliding rail 251 moves along the sliding block 221 until the bottom of the second side formwork 25 is separated from the top end of the side formwork 22, and the second side formwork 22 continues to move upwards to a height which does not affect the construction of the second reinforcement layer.
When the method is used for reinforcing the inner side of the silo, the related equipment in the installed silo does not need to be dismantled, the construction operation is simple and convenient, the construction material in the upper construction area can be dragged in the construction process, the influence on the lower equipment is small, the construction efficiency is improved, and the cost is reduced.
Finally, it should be noted that: the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: modifications can still be made to the embodiments of the invention or equivalents may be substituted for some of the features; without departing from the spirit of the technical solution of the present invention, the present invention should be covered by the technical solution of the present invention.
Claims (8)
1. A construction device for reinforcing the inner side of a silo is characterized by comprising:
the bearing assembly is arranged at the opening at the top of the silo;
the repairing template component is arranged below the bearing component and used for reinforcing the inner side of the silo;
the repair template assembly comprises
The supporting frame is fixedly connected with the bearing assembly, and a first telescopic oil cylinder which is telescopic in the horizontal direction is arranged on the supporting frame;
the side templates are fixed on a piston rod of the first telescopic oil cylinder and are vertically arranged in parallel to the inner wall of the silo;
the number of the bottom templates is the same as that of the side templates, the bottom templates are horizontally fixed at the bottoms of the side templates,
the first telescopic oil cylinder drives the side templates and the bottom template to move towards the inner wall direction of the silo until the bottom template is in close contact with the inner wall of the silo, the side templates, the bottom template and the inner wall of the silo form a repair space, and concrete is poured in the repair space to reinforce the inner wall of the silo.
2. The construction device for reinforcing the inner side of the silo as claimed in claim 1, wherein the side formworks are vertical arc-shaped plates concentrically arranged with the silo, the bottom formwork is a horizontal arc-shaped plate concentrically arranged with the bottom surface of the silo, and the bottom formwork and the side formworks are detachably connected.
3. The construction device for silo internal reinforcement of claim 2, wherein the support frame comprises a transverse support tube, a vertical support tube, and an inclined tube for increasing strength;
the transverse supporting tube comprises an outer tube and an inner tube, the inner tube is sleeved inside the outer tube, a slide way is arranged on the inner wall of the outer tube, and a sliding block is correspondingly arranged on the outer wall of the inner tube, so that the inner tube can slide along the length direction of the outer tube.
4. The construction device for reinforcing the inner side of the silo as claimed in claim 3, wherein the cylinder barrel of the first telescopic oil cylinder is fixed on the outer pipe, and the piston rod of the first telescopic oil cylinder is fixedly connected with the side template.
5. A construction apparatus for internal reinforcement of a silo as defined in claim 1 wherein the load bearing assembly comprises:
at least two bearing cross beams which are fixed on the top opening of the silo in parallel;
at least two second telescopic oil cylinders are vertically fixed on the bearing cross beam;
the upper end of the lifting pipe is connected with the second telescopic oil cylinder, and the lower end of the lifting pipe is fixedly connected with the support frame of the repair template assembly;
the lifting pipe is driven to lift through the extension and retraction of the second telescopic oil cylinder, so that the repairing template assembly is driven to lift.
6. The construction device for reinforcing the inner side of the silo as claimed in claim 1, wherein a second side formwork is arranged between two adjacent side formworks, and a second bottom formwork is arranged between two adjacent bottom formworks;
the second side template is an arc-shaped plate which is vertically arranged; the second bottom template is an arc-shaped plate horizontally arranged.
7. The construction device for reinforcing the inner side of the silo as claimed in claim 6, wherein the side formworks are provided with protruding sliding blocks with trapezoidal orthographic projections on the end faces of the two sides, the second side formwork is provided with sliding rails on the end faces of the two sides butted with the side formworks, the sliding rails are of a groove structure with trapezoidal orthographic projections, and the sliding rails are matched with the protruding sliding blocks in shape.
8. The construction device for reinforcing the inner side of the silo as claimed in claim 7, wherein the end surfaces of the bottom formwork and the second bottom formwork, which are close to the inner wall of the silo, are provided with sealing strips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221867291.0U CN217897274U (en) | 2022-07-18 | 2022-07-18 | Construction device for reinforcing inner side of silo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221867291.0U CN217897274U (en) | 2022-07-18 | 2022-07-18 | Construction device for reinforcing inner side of silo |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217897274U true CN217897274U (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221867291.0U Active CN217897274U (en) | 2022-07-18 | 2022-07-18 | Construction device for reinforcing inner side of silo |
Country Status (1)
| Country | Link |
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| CN (1) | CN217897274U (en) |
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2022
- 2022-07-18 CN CN202221867291.0U patent/CN217897274U/en active Active
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