CN220746089U - Buried PCCP cathode protection detection probe device - Google Patents
Buried PCCP cathode protection detection probe device Download PDFInfo
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- CN220746089U CN220746089U CN202322444334.5U CN202322444334U CN220746089U CN 220746089 U CN220746089 U CN 220746089U CN 202322444334 U CN202322444334 U CN 202322444334U CN 220746089 U CN220746089 U CN 220746089U
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- 239000000523 sample Substances 0.000 title claims abstract description 73
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 230000010287 polarization Effects 0.000 claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 239000004567 concrete Substances 0.000 claims abstract description 47
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 239000002689 soil Substances 0.000 claims abstract description 20
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 14
- 238000004210 cathodic protection Methods 0.000 claims description 21
- 238000004804 winding Methods 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims 7
- 239000010410 layer Substances 0.000 claims 2
- 238000003556 assay Methods 0.000 claims 1
- 239000011241 protective layer Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
- 238000003466 welding Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The embodiment of the utility model provides a buried PCCP cathode protection detection probe device, and relates to the technical field of pipeline detection. The device comprises a polarization probe and a test pile, wherein the polarization probe comprises an inner concrete tube core, a steel cylinder, an outer concrete tube core, a prestressed steel wire and a mortar protection layer which are sequentially arranged from inside to outside, the polarization probe is used for being buried into soil together with PCCP, the test pile is connected with the polarization probe, and the test pile is used for measuring the natural potential of a pipeline in the soil through the polarization probe. The device can realize accurate measurement of the natural potential of the buried PCCP in the cathode protection operation, thereby accurately evaluating the cathode protection effect of the pipeline.
Description
Technical Field
The utility model relates to the technical field of pipeline detection, in particular to a buried PCCP cathodic protection detection probe device.
Background
The prestressed steel cylinder concrete pipe (English name: prestressed concrete cylinder pipe, abbreviated as PCCP) is a novel composite pipe which is manufactured by adopting a steel sheet and bell and spigot joint steel ring to weld into a cylinder, then pouring concrete inside and outside the cylinder by using a vertical vibration method to manufacture a pipe core (for small-caliber pipes, the pipe core can be formed in the cylinder by adopting a horizontal centrifugal method), winding prestressed steel wires on the surface of the pipe core after maintenance, so that the pipe wall concrete builds circumferential prestress, and finally spraying a mortar protection layer on the outer surface of the wound pipe core.
The cathode protection of PCCP is to electrify the prestressed wire and the steel cylinder to obtain electrons, the electrons are located at the cathode, the other end of the PCCP is made of metal with higher activity than the prestressed wire or the steel cylinder of the pipeline, the metal is used as an anode, the anode is continuously consumed in soil, and the electrons are continuously transmitted to the prestressed wire and the steel cylinder through a cable, so that the protection effect is achieved.
Currently, the evaluation standard of the cathodic protection effect of PCCP mainly adopts the absolute value of the pipe polarization potential > 100mv, wherein the pipe polarization potential=pipe power-off potential-pipe natural potential. During cathodic protection operation, PCCP can obtain the pipeline polarization potential by measuring the pipeline outage potential and the pipeline natural potential. However, the natural potential of the pipeline is not constant due to the long-term change of the geological condition of the soil. Therefore, how to accurately measure the pipe outage potential of PCCP and the pipe natural potential of PCCP is a key to evaluate whether the cathodic protection of PCCP fails.
The existing method for detecting the power-off potential of the PCCP pipeline mainly adopts a corrosion hanging piece method during the operation of the PCCP, the natural potential of the pipeline is simulated and measured, a pipeline prestressed steel wire and a steel cylinder are simulated through the corrosion hanging piece, the pipeline prestressed steel wire and the steel cylinder are welded through a connecting cable and the corrosion hanging piece, an independent test point is reserved in a test pile, and the natural potential of the pipeline prestressed steel wire and the steel cylinder is equivalent to the natural potential of the pipeline by detecting the potential of the corrosion hanging piece relative to soil.
The main disadvantage of corrosion hangers is the inability to truly simulate the complete structure of the PCCP pre-stressed steel wire. Because PCCP's prestressing force steel wire has certain deformation when pipeline full load water and empty load, prestressing force steel wire also can expand or shrink along with the pipeline this moment, therefore the steel wire mainly receives stress corrosion effect, and corrosion hanging piece is mainly received comprehensive corrosion effect owing to there is not prestressing force.
The differential corrosion results in errors or even inaccuracies in measuring the natural potential of the pipe during operation of the PCCP, and eventually in erroneous evaluation of the cathodic protection effect of the PCCP.
Disclosure of Invention
The utility model aims to solve the technical problems: the natural potential detection of the pipeline of the existing buried PCCP during the cathodic protection operation is inaccurate, so that the cathodic protection effect of the PCCP is inaccurately evaluated.
In order to solve the technical problems, the utility model provides a buried PCCP cathodic protection detection probe device, which comprises a polarization probe and a test pile, wherein the polarization probe comprises an inner concrete tube core, a steel cylinder, an outer concrete tube core, a prestressed steel wire and a mortar protection layer which are sequentially arranged from inside to outside, the polarization probe is used for being buried in soil together with PCCP, the test pile is connected with the polarization probe, and the test pile is used for measuring the natural potential of a pipeline in the soil through the polarization probe.
In an alternative embodiment, the wall thickness of the steel cylinder in the polarized probe is equal to the wall thickness of the steel cylinder in the PCCP.
In an alternative embodiment, the wall thickness of the steel cylinder in the polarization probe is at least 1.5mm, the strength of the steel cylinder is not lower than 235Mpa, and the elastic modulus of the steel cylinder is not lower than 206000Mpa.
In an alternative embodiment, the prestressed wire in the polarization probe is a wire with a diameter of at least 5mm, the winding stress is not lower than 1099Mpa, and the elastic modulus is not lower than 205000Mpa.
In an alternative embodiment, the prestressed wire of the polarized probe is wound with a cross-sectional area of at least 6mm 2 And leading out the copper wire test cable to the test pile.
In an alternative embodiment, the wall thickness of the mortar protection layer is at least 25mm, the compressive strength of the mortar protection layer is at least 45Mpa, and the tensile strength is at least 3.49Mpa.
In an alternative embodiment, the compressive strength of the inner concrete core and the outer concrete core is not less than 50Mpa and the tensile strength is not less than 2.64Mpa.
In an alternative embodiment, the inner concrete core of the polarization probe and the inner concrete core of the PCCP are formed by adopting concrete with the same proportion, and the outer concrete core of the polarization probe and the outer concrete core of the PCCP are formed by adopting concrete with the same proportion.
In an alternative embodiment, the device further comprises a sacrificial anode and a reference electrode, both of which are buried in the soil, both of which are connected to the test stake, and the PCCP is provided with a welding spot connected to the test stake by a cable.
In an alternative embodiment, the device further comprises a protective box and a foundation pier, the foundation pier is buried in the soil, the protective box is mounted on the foundation pier, and the test pile is arranged in the protective box.
The buried PCCP cathode protection detection probe device provided by the embodiment of the utility model has the beneficial effects that:
1. through experiments, the accuracy of the device provided by the embodiment to the natural potential measurement of the pipeline is more than 95%;
2. the polarization probe and the PCCP are buried in the soil together, and have the same service life, so that the polarization probe cannot fail too early like the existing corrosion hanging piece, and the follow-up detection data are prevented from being dug again and damaged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an application scenario of a buried PCCP cathode protection detection probe device provided by an embodiment of the present utility model;
fig. 2 is a schematic structural view of a polarization probe.
Icon: 1-soil; 2-PCCP; 3-welding spots; 4-sacrificial anode; 5-a reference electrode; 6, protecting the box body; 7-base piers; 8-testing piles; 9-polarizing probes; 91-an inner concrete core; 92-steel cylinder; 93-an outer concrete core; 94-prestressed steel wire; 95-mortar protection layer; 96-copper wire test cable.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the present embodiment provides a buried PCCP cathode protection detection probe device (hereinafter referred to as "device") comprising a polarization probe 9, a sacrificial anode 4, a reference electrode 5, a protection box 6, a foundation pier 7 and a test pile 8.
Wherein, polarization probe 9, sacrificial anode 4, reference electrode 5, PCCP2 and foundation pier 7 are all buried in soil 1, and protection box 6 is installed on foundation pier 7, and test stake 8 sets up in the protection box 6, and polarization probe 9, sacrificial anode 4 and reference electrode 5 all are connected to test stake 8 through the cable, are provided with solder joint 3 on the PCCP2, and the one end of cable is connected to solder joint 3, and the other end of cable is connected to test stake 8.
The device provided by the embodiment can be used for measuring the pipeline power-on potential, the pipeline power-off potential, the anode open-circuit potential, the pipeline protection current and the pipeline natural potential and calculating the pipeline polarization potential. These parameters are all indicators of the evaluation of PCCP2 performance.
Wherein the potential of the reference electrode 5 measured by the test stake 8 is used as a reference.
Under the condition that the welding spot 3 on the PCCP2 is conducted with the sacrificial anode 4 through a cable, the potential of the sacrificial anode 4 relative to the reference electrode 5 measured by the test pile 8 is the pipeline energizing potential.
Under the condition that the welding spot 3 on the PCCP2 is disconnected from the sacrificial anode 4, the potential of the welding spot 3 on the PCCP2 relative to the reference electrode 5 measured by the test pile 8 is the pipeline outage potential.
Under the condition that the welding spot 3 on the PCCP2 is disconnected from the sacrificial anode 4, the potential of the sacrificial anode 4 relative to the reference electrode 5 measured by the test pile 8 is the anode open-circuit potential.
Under the condition that the welding spot 3 on the PCCP2 is conducted with the sacrificial anode 4 through the cable, the current on the cable between the welding spot 3 on the PCCP2 and the sacrificial anode 4 measured by the test pile 8 is the pipeline protection current.
In the case where no cathodic protection is applied to the PCCP2, i.e. in the case where the PCCP2 is not yet connected to the sacrificial anode 4, the potential of the soil 1 measured by the test stake 8 relative to the reference electrode 5 is the natural pipeline potential, that is, the potential of the polarized probe 9 measured by the test stake 8 relative to the reference electrode 5 is the natural pipeline potential.
The device provided by the embodiment measures the power-off potential and the natural potential of the pipeline, and then the formula is adopted: pipeline polarization potential = pipeline power-off potential-pipeline natural potential, the pipeline polarization potential can be obtained, and the cathodic protection effect of PCCP2 is evaluated.
More importantly, referring to fig. 2, the polarization probe 9 in the present embodiment includes an inner concrete core 91, a steel cylinder 92, an outer concrete core 93, a prestressed wire 94 and a mortar protection layer 95, which are sequentially disposed from inside to outside. In this way, the structure of the polarization probe 9 is similar to that of the normal buried PCCP2, that is, the PCCP2 also includes an inner concrete core 91, a steel cylinder 92, an outer concrete core 93, a prestressed wire 94 and a mortar protection layer 95 sequentially disposed from inside to outside, and the existing PCCP2 basically adopts such a layer structure. In this way, the polarization probe 9 can accurately simulate the stress state of the prestressed steel wire 94 and the steel cylinder 92 of the PCCP2, and can accurately reflect the natural potential of the pipeline during the operation of the PCCP 2.
The preparation process of the polarization probe 9 of this embodiment:
step 1: placing a steel cylinder 92 in a PVC sleeve, wherein the diameter of the PVC sleeve can be 100mm or 150mm, the wall thickness of the steel cylinder 92 of the polarization probe 9 is equal to that of the steel cylinder 92 in PCCP2, for example, the wall thickness of the steel cylinder 92 is at least 1.5mm, the strength of the steel cylinder 92 is not lower than 235Mpa, and the elastic modulus of the steel cylinder 92 is not lower than 206000Mpa;
step 2: pouring concrete on the inner side and the outer side of the steel cylinder 92, performing vertical vibration in the pouring process, further compacting the concrete, placing the concrete into a curing box for die curing after the pouring is completed to form an inner concrete die 91 and an outer concrete die 93, wherein the compression strength of the cured die concrete is not lower than 50Mpa, the tensile strength is not lower than 2.64Mpa, the inner concrete die 91 of the polarization probe 9 and the inner concrete die 91 in the PCCP2 are formed by adopting concrete with the same proportion, and the outer concrete die 93 of the polarization probe 9 and the outer concrete die 93 in the PCCP2 are formed by adopting concrete with the same proportion;
step 3: carrying out design calculation on the pre-stressed steel wire 94 to be wound, wherein the design calculation comprises bearing capacity limit calculation, core concrete cracking resistance checking calculation, mortar protection layer 95 stress checking calculation and anti-floating stability checking calculation, and the design requirement of the pre-stressed steel wire 94 of the polarization probe 9 can be referred to the design requirement of the pre-stressed steel wire 94 of PCCP2, so that the winding area, the winding layer number and the winding thread pitch of the pre-stressed steel wire 94 of the polarization probe 9 are determined;
step 4: the cured outer concrete core 93 is prestressed and wound according to the calculated winding area, number of winding layers and winding pitch, for example, steel wires with diameters of at least 5mm are adopted, and winding stress is controlled to be not lower than 1099Mpa, and elastic modulus is controlled to be not lower than 205000Mpa;
step 5: in the process of winding the pre-stressing wire 94, a cross-sectional area of at least 6mm is wound around the pre-stressing wire 94 2 A single-core or multi-core copper wire test cable 96, and the copper wire test cable 96 is led out;
step 6: and pouring a mortar protection layer 95 with the thickness of at least 25mm on the outer concrete pipe core 93 wound by the prestressed steel wire 94, and placing the outer concrete pipe core into a curing chamber for curing for 7 days after pouring, so that the compressive strength of the mortar protection layer 95 is at least 45Mpa and the tensile strength is at least 3.49Mpa.
Step 7: the polarization probe 9 manufactured according to the steps is used for measuring the natural potential of the pipeline, and is compared with the true natural potential of the pipeline, so that the accuracy of the measurement performance of the polarization probe 9 is judged. Wherein, the real natural potential of the pipeline refers to the natural potential measured on PCCP2 after PCCP2 is buried in test soil 1; in this step, the natural potential of the pipeline measured by the polarization probe 9 is the same as that measured by burying the polarization probe 9 in the same test soil 1, and if the natural potentials measured by the polarization probe 9 are equal, it can be determined that the measurement performance of the polarization probe 9 is accurate, and the polarization probe 9 can be used in the above device, otherwise, it is inaccurate.
The buried PCCP cathodic protection detection probe device provided by the embodiment has the beneficial effects that:
1. through experiments, the accuracy of the device provided by the embodiment to the natural potential measurement of the pipeline is more than 95%;
2. the polarization probe 9 and the PCCP2 are buried in the soil 1 together, the polarization probe 9 and the PCCP2 have the same service life, the polarization probe 9 cannot fail too early like the existing corrosion hanging piece, and the follow-up detection data are prevented from being dug again and damaged.
Therefore, the device provided by the embodiment can accurately simulate the steel wire stress corrosion in the PCCP2 by adopting the polarization probe 9, so that the detection data is accurate, and the service life is long.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides a buried PCCP cathodic protection detects probe device, its characterized in that, the device includes polarization probe (9) and test stake (8), polarization probe (9) are including interior concrete tube core (91), steel cylinder (92), outer concrete tube core (93), prestressing force steel wire (94) and mortar protective layer (95) that set gradually from interior to exterior, polarization probe (9) are arranged in burying soil (1) with PCCP (2) together, test stake (8) with polarization probe (9) are connected, test stake (8) are through pipeline natural potential in polarization probe (9) survey soil (1).
2. The buried PCCP cathodic protection inspection probe device of claim 1 wherein the wall thickness of the steel cylinder (92) in the polarization probe (9) is equal to the wall thickness of the steel cylinder (92) in the PCCP (2).
3. The buried PCCP cathodic protection inspection probe device of claim 1 wherein the wall thickness of the steel cylinder (92) in the polarization probe (9) is at least 1.5mm, the strength of the steel cylinder (92) is not lower than 235MPa, and the elastic modulus of the steel cylinder (92) is not lower than 206000MPa.
4. The buried PCCP cathodic protection inspection probe device according to claim 1, characterized in that said prestressed wire (94) of said polarization probe (9) is a wire having a diameter of at least 5mm, a winding stress of not less than 1099MPa, and an elastic modulus of not less than 205000MPa.
5. The buried PCCP cathodic protection assay of claim 1Probe device characterized in that said prestressed wire (94) of said polarization probe (9) is wound with a cross-sectional area of at least 6mm 2 A single-core or multi-core copper wire test cable (96), and leading out the copper wire test cable (96) to the test pile (8).
6. The buried PCCP cathodic protection inspection probe device of claim 1 wherein said mortar protection layer (95) has a wall thickness of at least 25mm, said mortar protection layer (95) having a compressive strength of at least 45MPa and a tensile strength of at least 3.49MPa.
7. The buried PCCP cathodic protection inspection probe device of claim 1 wherein the compressive strength of said inner concrete core (91) and said outer concrete core (93) is not lower than 50MPa and the tensile strength is not lower than 2.64MPa.
8. The buried PCCP cathodic protection inspection probe apparatus of claim 1 wherein said inner concrete core (91) of said polarization probe (9) is formed with the same ratio of concrete as said inner concrete core (91) in said PCCP (2) and said outer concrete core (93) of said polarization probe (9) is formed with the same ratio of concrete as said outer concrete core (93) in said PCCP (2).
9. The buried PCCP cathodic protection detection probe apparatus of claim 1 further comprising a sacrificial anode (4) and a reference electrode (5), both the sacrificial anode (4) and the reference electrode (5) being buried in the soil (1), both the sacrificial anode (4) and the reference electrode (5) being connected to the test stake (8), a solder joint (3) being provided on the PCCP (2), the solder joint (3) being connected to the test stake (8) by a cable.
10. The buried PCCP cathodic protection inspection probe device of claim 1 further comprising a protection box (6) and a foundation pier (7), said foundation pier (7) being buried in the soil (1), said protection box (6) being mounted on said foundation pier (7), said test pile (8) being disposed within said protection box (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322444334.5U CN220746089U (en) | 2023-09-08 | 2023-09-08 | Buried PCCP cathode protection detection probe device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322444334.5U CN220746089U (en) | 2023-09-08 | 2023-09-08 | Buried PCCP cathode protection detection probe device |
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| CN220746089U true CN220746089U (en) | 2024-04-09 |
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| CN202322444334.5U Active CN220746089U (en) | 2023-09-08 | 2023-09-08 | Buried PCCP cathode protection detection probe device |
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| CN (1) | CN220746089U (en) |
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- 2023-09-08 CN CN202322444334.5U patent/CN220746089U/en active Active
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