CN220267767U - Novel trolley-based cooperation lifting system - Google Patents
Novel trolley-based cooperation lifting system Download PDFInfo
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- CN220267767U CN220267767U CN202321763902.1U CN202321763902U CN220267767U CN 220267767 U CN220267767 U CN 220267767U CN 202321763902 U CN202321763902 U CN 202321763902U CN 220267767 U CN220267767 U CN 220267767U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000010276 construction Methods 0.000 claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 238000004873 anchoring Methods 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 238000005422 blasting Methods 0.000 description 10
- 239000002893 slag Substances 0.000 description 10
- 238000005553 drilling Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
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Abstract
The utility model discloses a novel trolley-based matched lifting system, which comprises a trolley, an auxiliary platform, a tractor, a track, a bend pulley and a plane pulley, wherein the auxiliary platform is arranged on the trolley; the tractor passes through the plane pulley and the bend pulley through the steel wire rope to be connected with the trolley; the auxiliary platform is provided with a direction-changing pulley, and a plane pulley is arranged within a certain distance from one side of the auxiliary platform, which is close to the tractor; the utility model provides a novel trolley-based coordination lifting system for guaranteeing construction safety of operators and improving expanding and excavating efficiency.
Description
Technical Field
The utility model relates to the field of inclined shaft construction, in particular to a novel trolley-based cooperation lifting system.
Background
In order to realize the aim of carbon peak and carbon neutralization, the country greatly develops renewable clean energy, wherein the pumped storage power station is used as the main force of renewable clean energy, the construction of the pumped storage power station is accelerated, and the number of projects is greatly increased.
The pumped storage power station has a complex structure, wherein the inclined shaft construction occupies a large part in the pumped storage power station, the inclined shaft excavation work engineering quantity is large, the danger coefficient is high, the construction difficulty is large, and the inclined shaft construction method becomes an important ring in the construction process of the pumped storage power station.
In the inclined shaft expanding and excavating stage, a well-reversing drilling machine method is generally adopted to excavate an A2.0-A3.0 m guide well in the inclined shaft excavation outline, and then the inclined shaft expanding and excavating stage is completed by manually drilling, blasting, layering and expanding all sections from top to bottom. The construction operation of drilling, blasting, prying and slag skimming is carried out from the upper part and the lower part of the traditional trolley to the face by using the manual shoulder pneumatic drill. The traditional inclined shaft excavation method has the advantages of high risk, high labor intensity, high operation difficulty, low operation efficiency and difficult standardized construction.
Disclosure of Invention
The utility model overcomes the defects of the prior art and provides the cooperation lifting system based on the novel trolley, which ensures the construction safety of operators and the lifting of the expanding and digging efficiency.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
a novel trolley-based cooperation lifting system comprises a trolley, an auxiliary platform, a tractor, a track, a redirection pulley and a plane pulley; the tractor passes through the plane pulley and the bend pulley through the steel wire rope to be connected with the trolley; the auxiliary platform is provided with a direction-changing pulley, and a plane pulley is arranged within a certain distance from one side of the auxiliary platform, which is close to the tractor;
the trolley comprises a main frame, an underframe, a rear platform, an upper platform, an operation platform, a left-right extension platform and wheels; the main frame is arranged on the underframe, and the wheels are arranged below the underframe; the whole main frame is trapezoid, an upper platform is arranged right above the main frame, left and right extension platforms are arranged on the left side and the right side of the main frame, an operation platform is arranged on the front side of the main frame, and a rear platform is arranged on the rear side of the main frame; the upper platform, the left and right extension platforms on the main frame are parallel to the underframe;
the included angle between the horizontal plane of the working platform and the face of the expanding and digging operation is controlled to be 60-80 degrees;
the auxiliary platform comprises a bearing part, a channel part and a conveying part; one side of the bearing part is connected with the channel part, and the other side is connected with the transport part; the bearing part is made of thick patterned steel materials, steel plates are welded up and down on the upright posts of the bearing part, 4 dowel bars are arranged under each upright post, the rock is put into the steel plates for more than 1.5m, and concrete pouring is arranged after the steel plates at exposed ends of the dowel bars are firmly welded; the passage part is used for workers to pass through and adopts the same structure as the bearing part; the upright posts of the transport part are driven into one piece every 0.5m, rock is put into the upright posts by more than 0.5m, and the rail is fixed on the transport part.
Further, the main frame is provided with a reinforcing structure, the reinforcing structure comprises a first cross bar arranged at the front side of the main frame, a second cross bar corresponding to the first cross bar arranged at the rear side of the main frame, a vertical bar perpendicular to the underframe arranged at the middle position of the main frame, a third cross bar corresponding to the first cross bar arranged between the vertical bars, and a third vertical bar arranged between the third cross bar and an upper platform arranged on the main frame; splayed reinforcing rods are arranged among the first cross rod, the second cross rod, the third cross rod and the underframe.
Further, a fourth cross rod is arranged in the middle of the underframe and at a position corresponding to the vertical rod, the underframe is divided into two rectangular areas by the fourth cross rod, and each rectangular area is provided with an inclined reinforcing rod.
Further, the rear platform comprises a supporting rod and a placing frame, one end of the placing frame is welded at the rear side of the main frame, and the supporting rod is welded between the main frame and the placing frame; the included angle between the placing rack and the working platform is controlled between 5 degrees and 35 degrees.
Further, a guide pulley for the traction steel wire rope and a lateral carrier roller for placing the traction steel wire rope to change the angle are arranged on the main frame.
Further, the wheels are disposed on the front and rear sides of the chassis, and the wheels on the front side are 2m to 3.5m from the front side edge of the chassis.
Furthermore, the auxiliary platform is erected by adopting a round steel pipe with the diameter of 200mm multiplied by 6 mm; welding steel plates with the thickness of 25mm multiplied by 2mm on the upright post: wheels are arranged on the front side and the rear side of the chassis, and the wheels on the front side are 2m to 3.5m away from the edge of the front side of the chassis.
Furthermore, the whole bracket of the transportation part of the auxiliary platform is in a grid shape, and permanent anchoring parts are additionally arranged on the upright posts of the transportation part, which are close to the bearing part and are 2.5m to 3.5 m; the permanent anchoring piece is put into the rock for 2.7m and exposed for 0.3m, the dowel bars are arranged around the permanent anchoring piece, and one dowel bar is arranged every 0.3 m.
Further, the auxiliary platform further comprises a gradual change part, and an upright post of the gradual change part is perpendicular to the inclined shaft construction surface; the gradual change portion is provided with a track.
Further, the rail is provided with a lower pad type steel cushion block so as to ensure stable structure.
Compared with the prior art, the utility model has the advantages that:
the matched lifting system has the advantages of simple structure composition, small occupied space, convenience in maintenance and scientific operation; the novel expanding and excavating trolley towed by the lifting system has the advantages of simple structure, great saving of time of drilling and slag skimming processes in the expanding and excavating process, high operation efficiency and wide application to expanding and excavating construction of hydraulic inclined shafts.
Drawings
FIG. 1 is a schematic illustration of the present utility model;
FIG. 2 is a schematic cross-sectional view of the present utility model;
FIG. 3 is a schematic top view of the auxiliary platform of the present utility model;
FIG. 4 is a schematic side cross-sectional view of the auxiliary platform of the present utility model;
FIG. 5 is a schematic view of a track of the present utility model;
FIG. 6 is a block diagram of the present utility model;
FIG. 7 is a block diagram of the utility model with the left and right extension platforms removed;
FIG. 8 is a cross-sectional view of another rear platform of the present utility model;
FIG. 9 is a view of a use scenario of a conventional expanding and excavating trolley;
FIG. 10 is a view of a usage scenario of the expanding excavation trolley of the present utility model;
FIG. 11 is a schematic diagram of a conventional hydraulic inclined shaft blasting;
FIG. 12 is a schematic view of a hydraulic inclined shaft blasting of the present utility model;
FIG. 13 is a schematic diagram of a conventional inclined shaft expansion and slag removal construction;
FIG. 14 is a schematic diagram of the inclined shaft expansion and slag skimming construction of the present utility model.
The marks in the figure are as follows: the device comprises a trolley 1, an auxiliary platform 2, a tractor 3, a track 4, a bend pulley 5, a plane pulley 6, a bearing part 2-1, a channel part 2-2, a transport part 2-3, a permanent anchor 2-31, a gradual change part 2-4 and a profile steel cushion block 4-1;
the novel horizontal type lifting frame comprises a main frame 1-1, an underframe 1-2, a rear platform 1-3, an upper platform 1-4, an operation platform 1-5, a left-right extension platform 1-6, wheels 1-7, guide pulleys 1-8, lateral carrier rollers 1-9, a first cross rod 1-11, a second cross rod 1-12, a third cross rod 1-13, a third vertical rod 1-14, a splayed reinforcing rod 1-15, a fourth cross rod 1-16, an oblique reinforcing rod 1-17, isosceles trapezoid reinforcing rods 1-18, supporting rods 1-31, a placing frame 1-32 and a step 1-61.
Detailed Description
The utility model is further described below with reference to the drawings and the detailed description.
As shown in fig. 1 to 14, a novel trolley 1-based cooperative lifting system comprises a trolley 1, an auxiliary platform 2, a tractor 3, a track 4, a diverting pulley 5 and a plane pulley 6. The tractor 3 passes through the plane pulley 6 and the direction-changing pulley 5 through a steel wire rope to be connected with the trolley 1; the auxiliary platform 2 is provided with a direction-changing pulley 5, and a plane pulley 6 is arranged in a certain distance from one side of the auxiliary platform 2 close to the tractor 3. When the expanding and excavating trolley 1 in the inclined shaft is operated, personnel can be ensured to stably and safely excavate and support the trolley 1, and the safety of the trolley 1 during blasting is ensured.
The trolley 1 comprises a main frame 1-1, an underframe 1-2, a rear platform 1-3, an upper platform 1-4, an operation platform 1-5, a left and right extension platform 1-6 and wheels 1-7. The main frame 1-1 is arranged on the underframe 1-2, and the wheels 1-7 are arranged below the underframe 1-2. The main frame 1-1 is of a trapezoid shape as a whole, an upper platform 1-4 is arranged right above the main frame 1-1, left and right extension platforms 1-6 are arranged on the left side and the right side of the main frame 1-1, an operation platform 1-5 is arranged on the front side of the main frame 1-1, and a rear platform 1-3 is arranged on the rear side of the main frame 1-1. The upper platform 1-4 and the left and right extension platform 1-6 on the main frame 1-1 are parallel to the underframe 1-2.
The trolley 1 in the scheme adopts the main frame 1-1 of the steel structure as a main structural support, the rear platform 1-3 is used as a material and equipment placement platform (meanwhile, equipment material is used as a weight), and 4-5 layers of steel structure platforms extend from the front side of the trolley 1 to serve as the personnel drilling construction operation platform 1-5. Compared with the traditional expanding and excavating trolley 1, personnel can stand on the expanding and excavating trolley 1 to directly perform drilling, explosion and slag skimming operations, the underground construction is avoided, and the risk of drilling, explosion and slag skimming operations is greatly reduced. Because the drilling operator does not need to bear hand wind drill to go down to the working face of the construction, namely the working face does not need to stand.
The included angle between the horizontal plane of the working platform 1-5 and the face surface of the expanding and digging work is controlled between 60 degrees and 80 degrees. The horizontal angle between the face and the working platform 1-5 is adjusted to be more than 60 degrees during the general expanding and digging. That is, after the trolley 1 of the present embodiment is adopted, the tunnel face does not need to be in a conventional horizontal shape during construction, but is inclined by 60 ° to 80 °, and generally 60 ° is adopted. This also allows the throwing surface of the ballast to be effectively controlled during the expanding excavation, and is not prone to hurting people and damaging the trolley 1.
The auxiliary platform 2 comprises a bearing part 2-1, a channel part 2-2 and a transport part 2-3. One side of the bearing part 2-1 is connected with the channel part 2-2, and the other side is connected with the transport part 2-3; the bearing part 2-1 is made of thick patterned steel materials, steel plates are welded up and down on the upright posts of the bearing part 2-1, 4 dowel bars are arranged under each upright post, the rock is put into more than 1.5m, and concrete pouring is arranged after the steel plates at the exposed ends of the dowel bars are firmly welded; the passage part 2-2 is used for workers to pass through and adopts the same structure as the bearing part 2-1; the upright posts of the transport part 2-3 are driven into one piece every 0.5m, and rock is put into the upright posts by more than 0.5m, and the rail 4 is fixed on the transport part 2-3. The vertical face diverting pulley 5 of the lifting system of the trolley 1 is arranged at the top of the upright post at the forefront end of the steel structure auxiliary platform 2 and is firmly welded with the post end.
Specifically, the auxiliary platform 2 is built by adopting a round steel pipe with the diameter of 200mm multiplied by 6 mm; welding steel plates with the thickness of 25mm multiplied by 2mm on the upright post: wheels are arranged on the front side and the rear side of the chassis, and the wheels on the front side are 2m to 3.5m away from the edge of the front side of the chassis.
The whole support of the transportation part 2-3 of the auxiliary platform 2 is in a grid shape, and permanent anchoring parts 2-31 are additionally arranged on the upright posts of the transportation part 2-3, which are close to the bearing part 2-12.5m to 3.5 m; the permanent anchoring pieces 2-31 are put into the rock for 2.7m and exposed for 0.3m, the dowel bars are arranged around the permanent anchoring pieces 2-31, and each dowel bar is arranged at intervals of 0.3 m. The trolley 1 can better control operation through the permanent anchoring parts 2-31, and generally only lifts and operates when blasting and blasting avoidance and dangerous rock cleaning and prying, and the maximum lifting range is 30m upwards from the face of the hand. The trolley 1 in other periods is attached to the face for working.
The auxiliary platform 2 further comprises a gradual change part 2-4, and an upright post of the gradual change part 2-4 is perpendicular to the inclined shaft construction surface; the gradual change part 2-4 is provided with a track 4. The lower pad steel cushion block 4-1 of the track 4 is used for ensuring the structural stability.
Preferably, the rail 4 is an I-shaped steel rail 4 or a standard steel rail, the track gauge is 3.0m, and the length of each section of rail 4 is 3.0m. The end of the track 4 is 3m away from the face, the track 4 of the front 3m adopts a temporary track 4, and the blasting flying stone is effectively prevented from being damaged before blasting.
The main frame 1-1 is provided with a reinforcing structure, the reinforcing structure comprises a first cross rod 1-11 arranged on the front side of the main frame 1-1, a second cross rod 1-12 corresponding to the first cross rod 1-11 arranged on the rear side of the main frame 1-1, a vertical rod perpendicular to the underframe 1-2 arranged in the middle of the main frame 1-1, a third cross rod 1-13 corresponding to the first cross rod 1-11 arranged between the vertical rods, and a third vertical rod 1-14 arranged between the third cross rod 1-13 and the main frame 1-1 and the upper platform 1-4. Splayed reinforcing rods 1-15 are arranged among the first cross rod 1-11, the second cross rod 1-12, the third cross rod 1-13 and the underframe 1-2. An effective reinforcement is achieved, whether the whole is formed with a partial triangle as a reinforcement form.
Preferably, a fourth cross bar 1-16 is arranged in the middle of the underframe 1-2 and at a position corresponding to the vertical bar, the fourth cross bar 1-16 divides the underframe 1-2 into two rectangular areas, and an inclined reinforcing bar 1-17 is arranged in each rectangular area. A partial triangular stable structure is formed at the bottom frame 1-2 to strengthen the deformation resistance of the trolley 1.
Preferably, the isosceles trapezoid reinforcing rods 1-18 are arranged on the front side of the underframe 1-2 corresponding to the main frame 1-1, so that the strength of the underframe 1-2 on the front side of the trolley 1 is reinforced, and the loss during operation is better reduced.
Preferably, the rear platform 1-3 comprises a supporting rod 1-31 and a placing frame 1-32, one end of the placing frame 1-32 is welded at the rear side of the main frame 1-1, and the supporting rod 1-31 is welded between the main frame 1-1 and the placing frame 1-32. The included angle between the placing frame 1-32 and the working platform 1-5 is controlled between 5 degrees and 35 degrees. As shown in fig. 6 and 8, different designs of the rear platform 1-3 can be adopted to strengthen the stability of the rear platform 1-3 and increase the bearing capacity.
Steps 1-61 are arranged on the left and right extension platforms 1-6, so that construction and transportation of corresponding materials are facilitated.
The main frame 1-1 is provided with a guide pulley 1-8 for traction steel wire ropes and a lateral idler 1-9 for placing the traction steel wire ropes to change angles. So as to better control the operation of the trolley 1.
Preferably, the wheels 1-7 are provided on the front and rear sides of the chassis 1-2, the wheels 1-7 on the front side being 2m to 3.5m from the front side edge of the chassis 1-2. The stone slag that produces during blasting is thrown in level and is got into the guide well, and the stone slag of throwing on is very little, and stone slag only destroys seriously to track 4 in the 5m within range of well head, still 2 ~ 3.5m distance because of novel expanding digger trolley 1 pastes behind the firm face, and track 4 that the front tread face contained angle leads to actually needing to cut off is only 1 ~ 2m because this scheme trolley 1 structure and face contained angle have shortened track 4 to a great extent and have changed installation time, have reduced the risk of track 4 installation work.
In conclusion, the matched lifting system of the scheme has the advantages of simple structure, small occupied space, convenience in maintenance and scientific operation; the novel expanding and excavating trolley 1 towed by the lifting system has the advantages of simple structure, great saving of time of drilling and slag skimming processes in the expanding and excavating process, high operation efficiency and wide application to expanding and excavating construction of hydraulic inclined shafts.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the concept of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (10)
1. The novel trolley-based cooperation lifting system is characterized by comprising a trolley, an auxiliary platform, a traction machine, a track, a bend pulley and a plane pulley; the tractor passes through the plane pulley and the bend pulley through the steel wire rope to be connected with the trolley; the auxiliary platform is provided with a direction-changing pulley, and a plane pulley is arranged within a certain distance from one side of the auxiliary platform, which is close to the tractor;
the trolley comprises a main frame, an underframe, a rear platform, an upper platform, an operation platform, a left-right extension platform and wheels; the main frame is arranged on the underframe, and the wheels are arranged below the underframe; the whole main frame is trapezoid, an upper platform is arranged right above the main frame, left and right extension platforms are arranged on the left side and the right side of the main frame, an operation platform is arranged on the front side of the main frame, and a rear platform is arranged on the rear side of the main frame; the upper platform, the left and right extension platforms on the main frame are parallel to the underframe;
the included angle between the horizontal plane of the working platform and the face of the expanding and digging operation is controlled to be 60-80 degrees;
the auxiliary platform comprises a bearing part, a channel part and a conveying part; one side of the bearing part is connected with the channel part, and the other side is connected with the transport part; the bearing part is made of thick patterned steel materials, steel plates are welded up and down on the upright posts of the bearing part, 4 dowel bars are arranged under each upright post, the rock is put into the steel plates for more than 1.5m, and concrete pouring is arranged after the steel plates at exposed ends of the dowel bars are firmly welded; the passage part is used for workers to pass through and adopts the same structure as the bearing part; the upright posts of the transport part are driven into one piece every 0.5m, rock is put into the upright posts by more than 0.5m, and the rail is fixed on the transport part.
2. The novel trolley-based cooperative lifting system as claimed in claim 1, wherein: the main frame is provided with a reinforcing structure, the reinforcing structure comprises a first cross bar arranged on the front side of the main frame, a second cross bar corresponding to the first cross bar arranged on the rear side of the main frame, a vertical bar perpendicular to the underframe arranged in the middle of the main frame, a third cross bar corresponding to the first cross bar arranged between the vertical bars, and a third vertical bar arranged between the third cross bar and an upper platform arranged on the main frame; splayed reinforcing rods are arranged among the first cross rod, the second cross rod, the third cross rod and the underframe.
3. The novel trolley-based cooperative lifting system as claimed in claim 2, wherein: a fourth cross rod is arranged in the middle of the underframe and corresponds to the vertical rod, the underframe is divided into two rectangular areas by the fourth cross rod, and each rectangular area is provided with an oblique reinforcing rod.
4. The novel trolley-based cooperative lifting system as claimed in claim 1, wherein: the rear platform comprises a supporting rod and a placing frame, one end of the placing frame is welded at the rear side of the main frame, and the supporting rod is welded between the main frame and the placing frame; the included angle between the placing rack and the working platform is controlled between 5 degrees and 35 degrees.
5. The novel trolley-based cooperative lifting system as claimed in claim 1, wherein: the main frame is provided with a guide pulley for the traction steel wire rope and a lateral carrier roller for placing the traction steel wire rope to change the angle.
6. The novel trolley-based cooperative lifting system as claimed in claim 1, wherein: wheels are arranged on the front side and the rear side of the chassis, and the wheels on the front side are 2m to 3.5m away from the edge of the front side of the chassis.
7. The novel trolley-based cooperative lifting system as claimed in claim 1, wherein: the auxiliary platform is erected by adopting a round steel pipe with the diameter of 200mm multiplied by 6 mm; welding steel plates with the thickness of 25mm multiplied by 2mm on the upright post: wheels are arranged on the front side and the rear side of the chassis, and the wheels on the front side are 2m to 3.5m away from the edge of the front side of the chassis.
8. The novel trolley-based cooperative lifting system as claimed in claim 1, wherein: the whole support of the transportation part of the auxiliary platform is in a grid shape, and permanent anchoring parts are additionally arranged on the upright posts of the transportation part, which are 2.5m to 3.5m close to the bearing part; the permanent anchoring piece is put into the rock for 2.7m and exposed for 0.3m, the dowel bars are arranged around the permanent anchoring piece, and one dowel bar is arranged every 0.3 m.
9. The novel trolley-based cooperative lifting system as claimed in claim 1, wherein: the auxiliary platform further comprises a gradual change part, and an upright post of the gradual change part is perpendicular to the inclined shaft construction surface; the gradual change portion is provided with a track.
10. The novel trolley-based cooperative lifting system as claimed in claim 9, wherein: the rail is padded with the shaped steel cushion under so as to guarantee stable structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321763902.1U CN220267767U (en) | 2023-07-06 | 2023-07-06 | Novel trolley-based cooperation lifting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321763902.1U CN220267767U (en) | 2023-07-06 | 2023-07-06 | Novel trolley-based cooperation lifting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220267767U true CN220267767U (en) | 2023-12-29 |
Family
ID=89297954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321763902.1U Active CN220267767U (en) | 2023-07-06 | 2023-07-06 | Novel trolley-based cooperation lifting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220267767U (en) |
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2023
- 2023-07-06 CN CN202321763902.1U patent/CN220267767U/en active Active
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