CN215443103U - A formwork instrument for shutoff reservation entrance to a cave - Google Patents
A formwork instrument for shutoff reservation entrance to a cave Download PDFInfo
- Publication number
- CN215443103U CN215443103U CN202120892612.1U CN202120892612U CN215443103U CN 215443103 U CN215443103 U CN 215443103U CN 202120892612 U CN202120892612 U CN 202120892612U CN 215443103 U CN215443103 U CN 215443103U
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- Prior art keywords
- hoop
- locking
- staple bolt
- rod
- formwork
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- 238000009415 formwork Methods 0.000 title claims abstract description 59
- 230000002040 relaxant effect Effects 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 238000000034 method Methods 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 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
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a formwork tool for plugging reserved holes, which comprises a plurality of supports and a locking hoop, wherein the plurality of supports are used for surrounding the periphery of a vertical component in the reserved holes; the locking staple bolt is including encircling the staple bolt ring of vertical component circumference, and the staple bolt is encircled and is connected each support and can hold each support tightly the centre gripping in vertical component's periphery, and the locking staple bolt is still including being used for tightening up and relaxing the staple bolt regulation structure of embracing the staple bolt ring. The formwork erecting tool provided by the utility model can reduce manpower, is convenient to construct, is safe and reliable, and improves the construction quality and speed of plugging the reserved hole.
Description
Technical Field
The utility model relates to the technical field of construction tools, in particular to a formwork supporting tool for plugging a reserved hole.
Background
When a reserved hole is plugged, the prior art generally adopts a formwork hanging method for construction, a U-shaped iron wire penetrates through a formwork below a floor slab, a reinforcing steel bar larger than the hole is bound at the upper end of the iron wire, the reinforcing steel bar is supported on the upper surface of the floor slab, the formwork is enabled to be tightly attached to the lower surface of the floor slab, then the hole is plugged, after the hole is tightly plugged, the iron wire on the upper surface and the lower surface of the floor slab is cut off from the root when concrete is solidified and can be disassembled, and the rest iron wire is reserved in the concrete.
The traditional mould hanging method has the following defects:
1) the mould lifting method consumes more manpower: after the iron wire penetrates through the lifting die, at least one person below the floor slab is required to support and adjust the position of the die plate, and at least one person is required to fix the upper part of the floor slab, so that the method can ensure tight bottom sealing only by the up-and-down matching operation of at least two persons on the floor slab, and more labor is consumed;
2) the mould hanging method has the following hidden troubles: according to the existing scheme, after the hole is plugged and the hanging die is removed, iron wires remained in the plugged part cannot be taken out, and after a period of time, the iron wires are easily corroded to cause water seepage and water leakage;
3) the template is not firmly fixed and is easy to fall off and leak: because the hanging mould only depends on the iron wire ligature as the support on the reinforcing bar, the iron wire breaks easily and drops when pouring plugging material vibrates, leads to the bottom hanging mould to become flexible, the seepage.
Therefore, how to conveniently, quickly, safely and reliably plug the reserved hole is a technical problem to be solved by the technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a formwork supporting tool for blocking a reserved hole, which can reduce labor, facilitate construction, and improve construction quality and speed of blocking the reserved hole.
In order to achieve the purpose, the utility model provides the following technical scheme:
a formwork tool for plugging a reserved hole, comprising:
the number of the brackets is multiple, the brackets are used for surrounding the periphery of a vertical component in a reserved hole, each bracket comprises a contact rod for contacting the vertical component and a support rod for supporting the bottom of a formwork, and the support rods are connected to the upper ends of the contact rods;
the locking staple bolt, the locking staple bolt is including encircleing the staple bolt ring of vertical component circumference, the staple bolt is encircled and is connected each the support can with each the support is embraced the centre gripping and is in vertical component's periphery, the locking staple bolt is still including being used for tightening up and relaxing the staple bolt regulation structure of hoop ring.
Preferably, the hoop includes that one is bent annular staple bolt pole, the both ends of staple bolt pole are passed through staple bolt adjusting structure links to each other, staple bolt adjusting structure includes connecting plate and fastener, be equipped with the regulation hole on the connecting plate, the tip of staple bolt pole passes the regulation hole, the fastener is used for locking the staple bolt pole passes the length in regulation hole.
Preferably, the end of the hoop rod is provided with an external thread, and the fastener is a fastening nut.
Preferably, the bracket is provided with a through hole for the hoop to pass through, and two sides of the through hole are provided with locking pieces for locking the relative positions of the bracket and the hoop.
Preferably, the periphery of the hoop ring is provided with external threads, and the locking piece is a locking nut matched with the hoop ring in a threaded manner.
Preferably, the diameter of the through hole is larger than the rod diameter of the hoop, a gasket is arranged between the locking nut and the through hole, and the diameter of the gasket is larger than the diameter of the through hole.
Preferably, each of the brackets is connected through two locking hoops, each of the brackets is provided with two through holes, and the two locking hoops are sequentially arranged along the axial direction of the vertical member.
Preferably, the contact rod and/or the support rod are/is an angle steel.
Preferably, the contact bar and the support bar are arranged vertically.
Preferably, the supporting rod is hinged to the upper end of the contact rod, and the formwork supporting tool further comprises an angle adjusting mechanism for locking an included angle between the supporting rod and the contact rod.
The utility model provides a formwork tool for plugging reserved holes, which comprises a plurality of supports and a locking hoop, wherein the plurality of supports are used for surrounding the periphery of a vertical member in the reserved hole; the locking staple bolt is including encircling the staple bolt ring of vertical component circumference, and the staple bolt is encircled and is connected each support and can hold each support tightly the centre gripping in vertical component's periphery, and the locking staple bolt is still including being used for tightening up and relaxing the staple bolt regulation structure of embracing the staple bolt ring.
The use process of the formwork supporting tool provided by the utility model is as follows:
before the entrance to a cave is reserved in the shutoff, install this formwork instrument in the periphery of vertical component earlier, at first, relax and embrace the hoop, make the whole below of going up to reserving the entrance to a cave along vertical component of formwork instrument, and make the bracing piece contact template lower surface of support, then, utilize staple bolt adjusting structure to tighten up and embrace the hoop and make the contact bar of each support embrace the centre gripping in the periphery of vertical component tightly, at this moment, this formwork instrument firmly is fixed in the periphery of vertical component, and form firm support to the template, accomplish the support of the template of reserving the entrance to a cave, then alright with carrying out the shutoff operation, after concrete solidification in reserving the entrance to a cave, relax and embrace the hoop, can dismantle this formwork instrument.
According to the scheme, the utility model has the following beneficial effects:
1) the operation is simple and convenient, and the labor is saved: according to the scheme, the formwork supporting tool can be moved and fastened by only a worker at the lower side of the floor slab, and two workers do not need to operate at the upper side and the lower side of the floor slab, so that the labor is greatly saved, the operation process is very simple, and the construction efficiency is high;
2) the construction quality is high: after the plugging is finished, any material or part except for the plugging material cannot be left in the reserved hole, so that the risks of corrosion, water seepage and the like do not exist, the construction quality is greatly improved, and the method is safe and reliable;
3) firm reliable, reuse: the formwork supporting tool provided by the scheme can be adjusted according to the specific size specification of the vertical member, has enough rigidity and strength, and can be repeatedly utilized;
4) the application range is wide: because the elasticity state of the hoop is adjustable, the vertical member in the hole can be bent at will according to the specific shape of the reserved hole, and the supports are supported and arranged in different directions along with the change of the hoop, so that the clamp is suitable for plugging reserved holes in various shapes, and the application range is expanded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an elevation view of the installation of a formwork tool in an embodiment of the present invention;
fig. 2 is a plan view of the installation of the formwork tool in the embodiment of the present invention.
The meaning of the various reference numerals in figures 1 to 2 is as follows:
1-bracket, 11-contact rod, 12-support rod, 2-perforation, 3-hoop, 4-connecting plate, 5-fastening nut, 6-locking nut and 7-gasket.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, fig. 1 is an elevation view illustrating the installation of a formwork tool according to an embodiment of the present invention; fig. 2 is a plan view of the installation of the formwork tool in the embodiment of the present invention.
The utility model provides a formwork tool for plugging reserved holes, which comprises a plurality of supports 1 and a locking hoop, wherein the number of the supports 1 is multiple, the supports 1 are used for surrounding the periphery of a vertical member in the reserved hole, each support 1 comprises a contact rod 11 for contacting the vertical member and a support rod 12 for supporting the bottom of a formwork, and the support rod 12 is connected to the upper end of the contact rod 11; the locking staple bolt is including encircling the staple bolt ring 3 of vertical component circumference, and each support 1 is connected and can hold each support 1 tightly the centre gripping in vertical component's periphery to the hoop ring 3, and the locking staple bolt still adjusts the structure including the staple bolt that is used for tightening up and relaxing hoop ring 3.
The use process of the formwork supporting tool provided by the utility model is as follows:
before the entrance to a cave is reserved in the shutoff, install this formwork instrument in the periphery of vertical component earlier, at first, loosen and embrace hoop 3, make the whole below of reserving the entrance to a cave of moving up along vertical component of formwork instrument, and make the bracing piece 12 contact template lower surface of support 1, then, utilize staple bolt to adjust structure tightening hoop 3 and make each support 1's contact lever 11 embrace the centre gripping in the periphery of vertical component, at this moment, this formwork instrument firmly is fixed in the periphery of vertical component, and form firm support to the template, accomplish the support of the template of reserving the entrance to a cave and establish, next alright in order to carry out the shutoff operation, after concrete solidification in reserving the entrance to a cave, relax hoop 3, can dismantle this formwork instrument.
It should be noted that the hoop ring 3 in this embodiment may be composed of one or two hoop rods, and the hoop adjusting structure may also be designed in various structural forms, for example, a connecting plate is used to connect the ends of the hoop rods and fasteners are used to fasten the positions of the hoop rods, or a sleeve structure is used and the sleeve is used to adjust the positions of the hoop rods in cooperation with the threads of the hoop rods, etc. Preferably, staple bolt ring 3 in this scheme includes that a bending becomes annular staple bolt pole, and the structure is adjusted through the staple bolt to the both ends of staple bolt pole and links to each other, and the structure is adjusted including connecting plate 4 and fastener to the staple bolt, is equipped with the regulation hole on the connecting plate 4, and connecting plate 4 can adopt the steel sheet preparation to form. The tip of staple bolt pole passes the regulation hole, and the fastener is used for locking the staple bolt pole and passes the length of adjusting the hole to adjust the annular girth of the hooping 3 that all staple bolts poles enclose, and then adjust the power of holding tightly to each support 1, realize holding tightly or relaxing of formwork instrument on vertical member.
Preferably, the end of the hoop rod is provided with external threads, and the fastening piece is a fastening nut 5. As shown in figures 1 and 2, the anchor ear rod extends out of the adjusting hole by the aid of threaded matching of the fastening nut 5 and the external threads at the end of the anchor ear rod.
It should be noted that the hoop ring 3 can clamp each bracket 1 in multiple ways, for example, a notch matched with the hoop ring 3 is designed on the outer side of each bracket 1, and the hoop ring 3 surrounds the periphery of each bracket 1, so as to form clamping force on the bracket 1; or, holes for the hooping rings 3 to pass through are designed on the brackets 1, the hooping rings 3 sequentially pass through the holes of the brackets 1, so that all the brackets 1 are stringed together, the clasping acting force can be applied to the brackets 1, and the like. Preferably, the support 1 in this scheme is provided with the perforation 2 that supplies staple bolt ring 3 to pass, and the both sides of perforation 2 still are equipped with the retaining member that is used for locking the relative position of support 1 and staple bolt ring 3 for prevent that support 1 from sliding along staple bolt ring 3 at will, guarantee that each support 1 is located the target location and supports the template.
It should be noted that, the above-mentioned retaining member can adopt structures such as fixed pin or lock nut, and preferably, the periphery of staple bolt ring 3 in this scheme is equipped with the external screw thread, namely, staple bolt ring 3 global design is the harness cord structure, and the retaining member is lock nut 6 with 3 screw-thread fit of staple bolt ring.
Preferably, the aperture of perforation 2 is greater than the rod diameter of hoop ring 3, in order to guarantee that lock nut 6 is effectively fixed to hoop ring 3 and support 1, gasket 7 has been arranged between lock nut 6 and perforation 2 to this scheme, and the diameter of gasket 7 is greater than the aperture of perforation 2. Specifically, the through hole 2 may be designed as a round hole or a square hole, and in a specific embodiment, the through hole 2 is a rectangular hole of 20mm × 10 mm. The interval and the straightness that hangs down of each support 1 can be fixed and adjusted to lock nut 6 and gasket 7 in this scheme, can be removed by a person with formwork instrument monolithic lifting after fixed, in order to avoid 2 frictions of perforation to damage the external screw thread of embracing hoop 3, this scheme is preferred to be equipped with the sheath at the hoop 3 and perforate between 2, and this sheath can adopt PVC or other plastics materials.
Preferably, the respective supports 1 are connected by means of two locking hoops, each support 1 being provided with two perforations 2, the two locking hoops being arranged one after the other in the axial direction of the vertical member. This scheme can play the effect of further strengthening the fastening through two locking staple bolts to each support 1, guarantees that each support 1 can not take place not hard up to make the whole optional position that can firmly be fixed in vertical member of formwork instrument.
It should be noted that the support 1 in this embodiment may be designed in various structural forms, for example, a bent steel rod structure, a bent steel pipe structure, or a welded angle steel structure, etc. Preferably, the contact bar 11 and/or the support bar 12 are/is an angle steel, and the contact bar 11 and the support bar 12 are preferably welded and fixed into a whole.
It should be noted that, the shape of the bracket 1 in this embodiment is related to the shape of the formwork to be supported and the vertical member to be clamped and fixed, for example, when the vertical member is a cylindrical structure and the formwork is a flat plate structure perpendicular to the vertical member, the included angle between the support rod 12 and the contact rod 11 is 90 ° to satisfy the effective support of the formwork and the effective contact and fixation with the vertical member, and when the vertical member is a conical cylindrical structure, the included angle between the support rod 12 and the contact rod 11 is less than 90 ° or greater than 90 °. Preferably, the contact rod 11 and the support rod 12 in this embodiment are arranged vertically.
In another preferred scheme, the support rod 12 is movably connected with the contact rod 11, and the included angle between the support rod and the contact rod is adjustable, so that the support rod is suitable for formwork fixing of various vertical components. Preferably, the support rod 12 is hinged to the upper end of the contact rod 11, and the formwork tool further comprises an angle adjusting mechanism for locking the included angle between the support rod 12 and the contact rod 11. Specifically, the angle adjusting mechanism may be a bolt locking mechanism, or an inclined strut mechanism with an adjustable length connected between the contact rod 11 and the support rod 12, or an adjusting mechanism with a bayonet lock clamped and limited with the arc-shaped plate, or the like. When changing application scene after, if the outside shape of the intraoral vertical member of reservation hole changes, the formwork instrument that this scheme provided also can firmly the centre gripping be fixed in the vertical member periphery to effectively support the template.
The manufacturing process of the formwork supporting tool provided by the scheme is as follows:
firstly, determining the number of the brackets 1 and the harness cord length of the hoop ring 3 according to the size of a reserved hole, and if the reserved hole is smaller and is close to the cavity, adopting three brackets 1 as a group; if the reserved hole is small and far away from the cavity, four brackets 1 can be adopted as a group; if the reserved hole is large, six or eight brackets 1 can be adopted as a group. Then, a plurality of brackets 1 are manufactured by angle steel welding. After the number of the angle iron supports is determined, each hoop harness wire penetrates into the through holes 2 of each layer of the angle iron supports on the ground, the harness wire length (namely the length of the hoop harness wire) is slightly longer than the perimeter of the embraced vertical member, a hoop ring 3 can be encircled, the two ends of the hoop harness wire are partially overlapped, and the hoop harness wire is installed and locked according to the sequence of a locking nut 6, a gasket 7, a PVC (polyvinyl chloride) sheath, the support 1, another gasket 7 and another locking nut 6 while being penetrated. After the supports 1 and the hoop rings 3 are installed, the positions of the grouped supports 1 are adjusted according to the circumference of the vertical member, so that the supports 1 are uniformly arranged, and the templates to be supported are uniformly stressed in the circumferential direction. Then, penetrate the both ends of staple bolt pole respectively in the adjusting hole of connecting plate 4, fastening nut 5 is installed to the staple bolt pole outside, and at this moment, the staple bolt pole encloses into a hoop 3 structure, can not need to hold vertical member tightly temporarily. Then, the operation worker can move the group of formwork supporting tools upwards to the reserved hole position from the bottom surface along the vertical member, and the prefabricated formwork is supported and fixed by the formwork supporting tools. After the template and the formwork supporting tool are installed in place, two fastening nuts 5 are adjusted to enable the upper and lower layers of hoop hoops 3 to be tightened and utilize the contact rods 11 of the supports 1 to tightly hold the vertical members, and the template supporting of the reserved hole is completed.
According to the scheme, the utility model has the following beneficial effects:
1) the operation is simple and convenient, and the labor is saved: according to the scheme, the formwork supporting tool can be moved and fastened by only a worker at the lower side of the floor slab, and two workers do not need to operate at the upper side and the lower side of the floor slab, so that the labor is greatly saved, the operation process is very simple, and the construction efficiency is high;
2) the construction quality is high: after the plugging is finished, any material or part except for the plugging material cannot be left in the reserved hole, so that the risks of corrosion, water seepage and the like do not exist, the construction quality is greatly improved, and the method is safe and reliable;
3) firm reliable, reuse: the formwork supporting tool provided by the scheme can be adjusted according to the specific size specification of the vertical member, has enough rigidity and strength, and can be repeatedly utilized;
4) the application range is wide: because the elasticity state of the hoop is adjustable, the vertical member in the hole can be bent at will according to the specific shape of the reserved hole, and the supports are supported and arranged in different directions along with the change of the hoop, so that the clamp is suitable for plugging reserved holes in various shapes, and the application range is expanded.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A formwork tool for plugging a reserved hole, comprising:
the number of the brackets is multiple, the brackets are used for surrounding the periphery of a vertical component in a reserved hole, each bracket comprises a contact rod for contacting the vertical component and a support rod for supporting the bottom of a formwork, and the support rods are connected to the upper ends of the contact rods;
the locking staple bolt, the locking staple bolt is including encircleing the staple bolt ring of vertical component circumference, the staple bolt is encircled and is connected each the support can with each the support is embraced the centre gripping and is in vertical component's periphery, the locking staple bolt is still including being used for tightening up and relaxing the staple bolt regulation structure of hoop ring.
2. The formwork tool for plugging a reserved hole according to claim 1, wherein the hoop holding ring comprises a hoop holding rod bent into a ring shape, two ends of the hoop holding rod are connected through the hoop adjusting structure, the hoop adjusting structure comprises a connecting plate and a fastener, the connecting plate is provided with an adjusting hole, the end of the hoop holding rod penetrates through the adjusting hole, and the fastener is used for locking the length of the hoop holding rod penetrating through the adjusting hole.
3. The formwork tool for plugging a reserved hole according to claim 2, wherein the end part of the hoop rod is provided with external threads, and the fastening piece is a fastening nut.
4. The formwork tool for blocking the reserved hole according to claim 1, wherein the bracket is provided with a through hole for the hoop to pass through, and locking pieces for locking the relative positions of the bracket and the hoop are arranged on two sides of the through hole.
5. The formwork tool for plugging a reserved hole according to claim 4, wherein the outer periphery of the hoop ring is provided with external threads, and the locking piece is a locking nut in threaded fit with the hoop ring.
6. The formwork tool for plugging a reserved hole according to claim 5, wherein the diameter of the through hole is larger than the rod diameter of the hoop, a gasket is arranged between the lock nut and the through hole, and the diameter of the gasket is larger than the diameter of the through hole.
7. A formwork tool for plugging a reserved hole according to claim 4, wherein each bracket is connected through two locking hoops, each bracket is provided with two through holes, and the two locking hoops are sequentially arranged along the axial direction of the vertical member.
8. The formwork tool for plugging a reserved hole according to claim 1, wherein the contact rod and/or the support rod are angle steel.
9. The formwork tool for plugging a reserved hole as claimed in claim 1, wherein the contact rod and the support rod are arranged vertically.
10. The formwork tool for plugging a reserved hole according to claim 1, wherein the supporting rod is hinged to the upper end of the contact rod, and the formwork tool further comprises an angle adjusting mechanism for locking an included angle between the supporting rod and the contact rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892612.1U CN215443103U (en) | 2021-04-27 | 2021-04-27 | A formwork instrument for shutoff reservation entrance to a cave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892612.1U CN215443103U (en) | 2021-04-27 | 2021-04-27 | A formwork instrument for shutoff reservation entrance to a cave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215443103U true CN215443103U (en) | 2022-01-07 |
Family
ID=79705919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120892612.1U Active CN215443103U (en) | 2021-04-27 | 2021-04-27 | A formwork instrument for shutoff reservation entrance to a cave |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215443103U (en) |
-
2021
- 2021-04-27 CN CN202120892612.1U patent/CN215443103U/en active Active
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