CN213388244U - Sled dress formula sewage treatment plant - Google Patents
Sled dress formula sewage treatment plant Download PDFInfo
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- CN213388244U CN213388244U CN202022094491.4U CN202022094491U CN213388244U CN 213388244 U CN213388244 U CN 213388244U CN 202022094491 U CN202022094491 U CN 202022094491U CN 213388244 U CN213388244 U CN 213388244U
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Abstract
The utility model relates to a sled dress formula sewage treatment plant, including device base, an outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo and a section of thick bamboo that deposits, an outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo and a section of thick bamboo are fixed in on the device base, an interior sewage treatment section of thick bamboo is in an outer sewage treatment section of thick bamboo inboard, an interior sewage treatment section of thick bamboo with form the aeration zone between the outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo inboard has the anoxic zone, and a section of thick bamboo is located an outer sewage treatment section of thick bamboo outside or inboard, the aeration zone with anoxic zone and a. The utility model discloses in, an outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo, a sediment section of thick bamboo and device base can the mill prefabricate also can the on-the-spot preparation, and each device can be assembled the back fortune to the scene also can install on-the-spot, need not pile up on the scene like prior art, and the use of tubular structure, then can reduce sewage treatment plant's size, when convenient the transportation, has also reduced sled dress formula sewage treatment plant's occupation space.
Description
Technical Field
The utility model relates to a skid-mounted sewage treatment device in the sewage treatment field.
Background
The present activated sludge process sewage treatment apparatus, such as "integrated sewage treatment tank for improving AAO and sewage treatment method" disclosed in chinese patent CN104891656A, discloses an integrated sewage treatment tank and sewage treatment method, which comprises a rectangular tank body, and the tank body is divided into an anaerobic dephosphorization zone, a low-oxygen aeration zone, a strengthening aeration zone and a sedimentation zone which are adjacent to each other in sequence by a partition wall. The anaerobic phosphorus removal zone comprises a first anaerobic phosphorus removal zone and a second anaerobic phosphorus removal zone, the low-oxygen aeration zone comprises a first low-oxygen aeration zone and a second low-oxygen aeration zone, the first low-oxygen aeration zone is provided with an air thrust zone at the water inlet end, and the settling zone is communicated with the anaerobic phosphorus removal zone through a sludge backflow channel.
Aeration devices with self-cleaning function are arranged in the hypoxia aeration area and the strengthening aeration area, an air impeller is arranged in the air impeller area, and a sludge suction and scraper is arranged in the sedimentation area. When the device is used, wastewater is conveyed into the first anaerobic phosphorus removal zone, mixed liquid which circulates to the first anaerobic phosphorus removal zone from the second anaerobic phosphorus removal zone is mixed, and denitrification and anaerobic phosphorus release reactions are carried out in the first anaerobic phosphorus removal zone and the second anaerobic phosphorus removal zone; circulating most of the mixed liquor treated in the second anaerobic dephosphorization zone to the first anaerobic dephosphorization zone, wherein the inlet water is only required to be mixed, allowing a small part of the mixed liquor to sequentially enter the first low-oxygen aeration zone and the second low-oxygen aeration zone, absorbing and degrading COD, ammonia nitrogen and the like by using microorganisms, and simultaneously performing nitration reaction and denitrification reaction, thereby effectively removing part of organic matters which are difficult to degrade, allowing most of the mixed liquor treated in the second aeration zone to flow to the mixed liquor entering the second anaerobic dephosphorization zone through an air flow pushing zone and mixing the mixed liquor, allowing a small part of the mixed liquor to enter an enhanced aeration zone, enhancing the removal of the organic matters, allowing the mixed liquor treated in the enhanced aeration zone to enter a settling zone for sludge-water separation, allowing the separated sludge to flow back to the first anaerobic dephosphorization zone, and discharging supernatant above the settling zone.
Briefly, wastewater is subjected to denitrification and anaerobic phosphorus release reaction in an anaerobic phosphorus removal area under an anaerobic environment, then subjected to nitrification and denitrification in an aeration area to decompose organic matters, and finally subjected to sludge-water separation in a settling area, wherein part of sludge in the settling area flows back to the first anaerobic phosphorus removal area. However, in the prior art, the whole sewage treatment tank is of a rectangular structure with a large volume, occupies a large area, basically needs to be piled up on site, and is not suitable for occasions with small sewage treatment capacity and inconvenient site construction.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a sled dress formula sewage treatment plant who conveniently transports and sparingly take up an area of.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model provides a sled dress formula sewage treatment plant, includes device base, an outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo and a section of thick bamboo that deposits, an outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo and a section of thick bamboo are fixed in on the device base, an interior sewage treatment section of thick bamboo is in an outer sewage treatment section of thick bamboo inboard, an interior sewage treatment section of thick bamboo with form the aeration district between the outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo inboard has the anoxic zone, and a section of thick bamboo that deposits is located an outer sewage treatment section of thick bamboo outside or inboard, the aeration district.
Further, the device base, the inner sewage treatment barrel, the outer sewage treatment barrel and the sedimentation barrel are made of metal materials and/or enamel materials.
Furthermore, the inner sewage treatment cylinder and the outer sewage treatment cylinder are concentrically arranged, the sedimentation cylinder is positioned outside the outer sewage treatment cylinder or between the inner sewage treatment cylinder and the outer sewage treatment cylinder, and the inner cavity of the inner sewage treatment cylinder forms the anoxic zone.
Further, deposit a section of thick bamboo and be located outer sewage treatment section of thick bamboo is inboard, and interior sewage treatment section of thick bamboo is located and deposits between a section of thick bamboo and the outer sewage treatment section of thick bamboo, and the space between interior sewage treatment section of thick bamboo and the section of thick bamboo that deposits constitutes the anoxic zone.
Furthermore, the skid-mounted sewage treatment device also comprises a sludge suction pipe extending into the sedimentation cylinder, a sludge discharge pump and a sludge reflux pump are arranged on the sludge suction pipe, the outlet of the sludge discharge pump is used for being connected with a sludge collection system, and the outlet of the sludge reflux pump is connected with the anoxic zone through a sludge discharge pipe; the skid-mounted sewage treatment device further comprises a nitrifying liquid return pipe, a nitrifying liquid return pump is mounted on the nitrifying liquid return pipe, an inlet of the nitrifying liquid return pipe is connected with the aeration area, and an outlet of the nitrifying liquid return pipe is connected with the anoxic area.
Furthermore, a precipitation cylinder is positioned at the inner side of the inner sewage treatment cylinder, and an annular anoxic zone is formed between the precipitation cylinder and the inner sewage treatment cylinder.
Furthermore, an anoxic zone air impeller is arranged in the anoxic zone, an aeration zone air impeller is arranged in the aeration zone with an annular structure, and air stirring equipment is also arranged in the anaerobic zone.
Furthermore, a plurality of radially distributed aeration devices taking the inner sewage treatment barrel as the center are arranged at the bottom of the aeration zone.
Furthermore, an inclined tube filler is arranged in the settling cylinder, a middle water inlet pipe with the lower end located on the lower side of the inclined tube filler is arranged in the middle of the settling cylinder, an inclined tube filler backwashing device is arranged on the lower side of the inclined tube filler, a water receiving tank is arranged at the upper end of the periphery of the settling cylinder, and a sludge hopper and a sludge suction device are arranged at the bottom of the settling cylinder.
Further, skid-mounted sewage treatment plant still include to the air-blower of aeration equipment air feed, be connected with the air main line on the air outlet of air-blower, be provided with gas flowmeter on the air main line, link to each other through two air branch lines between air main line and the aeration equipment, air main line and each air branch line pass through the air and mix and use the cylinder to link to each other.
The utility model has the advantages that: the utility model discloses in, whole sewage treatment plant adopts sled dress formula structure, outer sewage treatment section of thick bamboo promptly, interior sewage treatment section of thick bamboo, a sediment section of thick bamboo and device base all can the engineering prefabrication also can the on-the-spot preparation, each device can assemble the back and transport the on-the-spot and also can transport and assemble after the on-the-spot, can also carry out the on-the-spot preparation after certainly transporting the device material, do not need to pile up at the on-the-spot like prior art, and the use of tubular structure, then can reduce sewage treatment plant's size, when convenient the transportation, sled dress formula sewage treatment plant's occupation space has also been reduced.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the arrangement of the bottom of the tank of FIG. 1;
FIG. 3 is a schematic view of the partition of FIG. 1;
FIG. 4 is a sectional view taken along line A-A of FIG. 1;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 7 is a cross-sectional view taken along line D-D of FIG. 1;
fig. 8 is a schematic structural view of embodiment 2 of the present invention;
fig. 9 is a schematic structural view of embodiment 3 of the present invention.
In the figure: 1. an outer sewage treatment barrel, 2, an aeration zone, 3, an anoxic zone, 4, an inner sewage treatment barrel, 5, a settling zone, 6, a settling barrel, 7, a water passing hole, 8, a middle water inlet pipe, 9, an aeration zone water outlet pipeline, 10, a nitrifying liquid return pipe, 11, a nitrifying liquid return pump, 12, an inlet of the nitrifying liquid return pipe, 13, a sludge suction pipe, 14, a sludge discharge pump, 15, a sludge return pump, 16, an annular walkway plate, 17, a straight walkway plate, 18. the system comprises a dissolved oxygen meter, 19, an air stirring pipeline, 20, a water inlet pipe, 21, an air pipeline, 22, an aeration device, 23, an air stirring device, 24, an anoxic zone air impeller, 25, an aeration zone air impeller, 26, an inclined pipe filler, 27, an air flow meter, 28, an air cylinder, 29, a back washing device, 30, a device base, 31, a guide rail, 32, a blowing branch pipe and 33, and a sludge discharge pipe.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The following describes in detail various embodiments of the present invention with reference to the accompanying drawings.
The utility model provides an embodiment 1 of sled dress formula sewage treatment plant is as shown in fig. 1~7, including device base 30, be fixed with on the device base 30 from interior to the gradual grow of outer diameter's a section of thick bamboo 6, an interior sewage treatment section of thick bamboo 4 and an outer sewage treatment section of thick bamboo 1, a section of thick bamboo 6, an interior sewage treatment section of thick bamboo 4 and an outer sewage treatment section of thick bamboo 1 set up with one heart, the inboard space of a section of thick bamboo forms precipitation zone 5, the space between a section of thick bamboo and the interior sewage treatment section of thick bamboo forms anoxic zone 3, the space between an interior sewage treatment section of thick bamboo and an outer sewage treatment section of thick bamboo forms aeration zone 2, anoxic zone and aeration zone are the. In this embodiment, the device base 30 is a circular structure matched with the diameter of the outer sewage treatment cylinder, and the device base, the sedimentation cylinder, the inner sewage treatment cylinder and the outer sewage treatment cylinder are all prefabricated by steel materials in a factory.
The inner sewage treatment barrel 4 is provided with a water passing hole 7 for communicating the anoxic zone with the aeration zone, the effluent of the anoxic zone enters the aeration zone 2 through the water passing hole 7, and the removal of most pollutants such as COD, ammonia nitrogen and total nitrogen is completed in the aeration zone. Be provided with a plurality of interior sewage treatment section of thick bamboo as the aeration equipment 22 that is radial distribution of center in the bottom in aeration zone, in this embodiment, aeration equipment adopts the liftable formula micropore aeration hose that the cell body bottom laid, and this hose has the self-cleaning and does not stop and changes the function, easy to assemble and maintenance. The aeration equipment which is combined with the aeration zone and is radially distributed in shape not only facilitates the laying of pipelines and the installation of equipment, but also can fully ensure the uniform aeration of the whole aeration zone. In the figure, item 31 denotes a guide rail for moving the aeration apparatus up and down, and item 32 denotes a blast branch pipe for supplying air to the aeration apparatus.
Be provided with anoxic zone air impeller 24 in the anoxic zone, be provided with aeration zone air impeller 25 in the aeration zone of annular structure, the anoxic zone still is provided with gas agitated vessel 23, and gas agitated vessel's effect is in the mixing state for making the sewage in anoxic zone, and anoxic zone air impeller's effect utilizes the air to promote sewage, makes sewage be in continuous circulation state to reach full mixing state, be favorable to in time diluting the pollutant concentration in the aquatic, reduce the impact of microorganism.
An inclined tube filler 26 is arranged in the sedimentation cylinder, a middle water inlet pipe 8 with the lower end positioned on the lower side of the inclined tube filler is arranged in the middle of the sedimentation cylinder, an inclined tube filler backwashing device 29 is arranged on the lower side of the inclined tube filler, and a water collecting tank is arranged at the upper end of the periphery of the sedimentation cylinder. The sewage treated by the aeration zone enters the middle water inlet pipe 8 through the water outlet pipeline 9 of the aeration zone and then enters the sedimentation zone to be subjected to mud-water separation to remove most suspended matters in the sewage, the design form of the sedimentation zone is that the sewage enters the middle part and goes out from the periphery, the sewage enters the sedimentation zone through the middle water inlet pipe, the effluent flows out through the water collecting groove positioned on the outer ring of the sedimentation zone, and finally the effluent is discharged after reaching the standard through the water outlet pipeline or enters the next unit for treatment, and the effluent is stable. After the operation is carried out for a period of time, a valve of the back washing pipeline needs to be opened, the inclined pipe is back washed by introducing air, sludge attached to the inclined pipe is removed, and the sludge-water separation effect of a settling zone is ensured.
The bottom plate in settling zone is provided with the sludge bucket, and the mud that subsides get off concentrates on the sludge bucket in, is provided with in the sludge bucket and inhales the mud device, and the other end of inhaling the mud device is connected with the mud straw, is provided with sludge discharge pump 14 and sludge reflux pump 15 on the mud straw 13, and the export of sludge discharge pump is used for linking to each other with mud collection system, and the export of sludge reflux pump passes through mud calandria 33 and links to each other with the anoxic zone. The sludge reflux pump works continuously, sludge in the settling zone can be refluxed to the anoxic zone to supplement microorganisms of a biochemical system, the sludge discharge pump works in a clearance mode, when sludge is required to be discharged, the sludge discharge pump discharges residual sludge in the settling zone to the sludge concentration tank, and the sludge reflux pump and the sludge discharge pump are connected through a pipeline and a valve. The skid-mounted sewage treatment device further comprises a nitrifying liquid return pipe 10, a nitrifying liquid return pump 11 is mounted on the nitrifying liquid return pipe, an inlet 12 of the nitrifying liquid return pipe is connected with the aeration area, and an outlet of the nitrifying liquid return pipe is connected with the anoxic area. The nitrifying liquid reflux pipe enables the nitrifying liquid to reflux from the tail end of the aeration tank to the anoxic zone, and the nitrogen removal effect is guaranteed. The tail end of the aeration zone is provided with a dissolved oxygen meter 18 which displays the dissolved oxygen concentration in the aeration zone on site and is connected with an automatic dissolved oxygen control system to control the dissolved oxygen concentration in the aeration zone in real time.
The skid-mounted sewage treatment device further comprises an air blower, the air blower provides air for the required air equipment, one path of air blower air volume is conveyed to the sewage treatment device through an air main pipeline 21, a gas flow meter 27 is arranged on the air main pipeline, the air main pipeline is connected with two air branch pipelines through an air mixing cylinder 28, the air branch pipelines are connected with corresponding aeration equipment through a plurality of air blowing branch pipes 32, and the air mixing cylinder is used for mixing air to enable the air entering the aeration equipment to be uniformly distributed. The air main pipeline is connected with an aeration zone air impeller which is supplied to the aeration zone and a sedimentation zone back washing device in a branching way, and a gas flow meter is arranged on an air pipeline going to the aeration zone air impeller to monitor the air quantity. And the other path of air blower is supplied to the air stirring equipment and the air impeller of the anoxic zone, and an air flow meter is arranged on an air pipe going to the air impeller of the anoxic zone to monitor the air quantity.
The edge of an outer sewage treatment barrel is provided with an annular walkway plate 16, a straight walkway plate 17 is arranged between an inner sewage treatment barrel and the outer sewage treatment barrel, and the walkway plate is correspondingly arranged by an operator to observe and overhaul the working condition of the skid-mounted sewage treatment device in real time. From the appearance, the utility model provides a sled dress formula sewage treatment plant is only a jar structure, and area is little, and the transportation is convenient, directly accomplishes at the mill prefabrication, transport to the field usage can, need not pile up the construction at the scene, be favorable to reducing the equipment investment, shorten production cycle's characteristics. The utility model discloses a sled dress formula sewage treatment plant is when using, and a sewage treatment section of thick bamboo, an outer sewage treatment section of thick bamboo, a sediment section of thick bamboo and device base can transport the scene respectively, accomplishes the equipment at the scene, also can accomplish the equipment back at the mill, directly transports to the scene. In other embodiments of the utility model, the sewage treatment barrel, the outer sewage treatment barrel and the sedimentation barrel can also be enamel structures with barrel bottoms, and are spliced and connected with the device base when in use; of course, when the equipment volume is larger, the device base, the sedimentation cylinder, the outer sewage treatment cylinder and the inner sewage treatment cylinder can be processed on site after the corresponding steel products are transported to the site.
During the use, the incoming water passes through the inlet tube and at first gets into the anoxic zone, evenly mix and circulate through the air impeller in the anoxic zone, get into the aeration district after the abundant reaction, through water hole intercommunication between aeration district and the anoxic zone, the organic matter fully reflects under aeration district aeration equipment etc. effect, after getting rid of most pollutants, get into the settling zone through middle inlet tube, carry out mud-water separation under the effect of pipe chute filler, settling zone upper portion clear water is collected through peripheral basin and is discharged through the drain pipe, the mud of lower part is by the dredge pipe through the dredge pump suction, most flows back to the anoxic zone through mud backwash pump, a small part is discharged to sludge collection system through mud discharge pump.
An example 2 of a skid-mounted sewage treatment apparatus is shown in fig. 8: embodiment 2 differs from embodiment 1 in that the inner wastewater treatment cartridge 4 is located between the sedimentation cartridge 6 and the outer wastewater treatment cartridge 1, and the inner bore area of the inner wastewater treatment cartridge 4 constitutes the anoxic zone 3.
An example 3 of a skid-mounted sewage treatment apparatus is shown in fig. 9: embodiment 3 is different from embodiment 1 in that the precipitation cylinder 6 is positioned outside the outer sewage treatment cylinder 1, the inner hole area of the inner sewage treatment cylinder 1 forms the anoxic zone 3, and in this case, the precipitation cylinder and the outer sewage treatment cylinder can share one device base or can respectively use independent device bases.
The above embodiments are only embodiments of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made in the specification and drawings or directly or indirectly applied to other related technical fields are included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a sled dress formula sewage treatment plant which characterized in that: including device base, an outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo and a section of thick bamboo that deposits are fixed in on the device base, an interior sewage treatment section of thick bamboo is in an outer sewage treatment section of thick bamboo inboard, an interior sewage treatment section of thick bamboo with form the aeration zone between the outer sewage treatment section of thick bamboo, an interior sewage treatment section of thick bamboo inboard has the anoxic zone, and a section of thick bamboo that deposits is located an outer sewage treatment section of thick bamboo outside or inboard, the aeration zone with.
2. The skid-mounted sewage treatment device according to claim 1, wherein: the device base, the inner sewage treatment cylinder, the outer sewage treatment cylinder and the sedimentation cylinder are made of metal materials and/or enamel materials.
3. The skid-mounted sewage treatment apparatus according to claim 1, wherein: the inner sewage treatment cylinder and the outer sewage treatment cylinder are concentrically arranged, the precipitation cylinder is positioned outside the outer sewage treatment cylinder or between the inner sewage treatment cylinder and the outer sewage treatment cylinder, and the inner cavity of the inner sewage treatment cylinder forms the anoxic zone.
4. The skid-mounted sewage treatment apparatus according to claim 1, wherein: the sedimentation cylinder is positioned on the inner side of the outer sewage treatment cylinder, the inner sewage treatment cylinder is positioned between the sedimentation cylinder and the outer sewage treatment cylinder, and the space between the inner sewage treatment cylinder and the sedimentation cylinder forms the anoxic zone.
5. The skid-mounted sewage treatment apparatus according to claim 1, wherein: the skid-mounted sewage treatment device also comprises a sludge suction pipe extending into the sedimentation cylinder, a sludge discharge pump and a sludge reflux pump are arranged on the sludge suction pipe, the outlet of the sludge discharge pump is used for being connected with a sludge collection system, and the outlet of the sludge reflux pump is connected with the anoxic zone through a sludge discharge pipe; the skid-mounted sewage treatment device further comprises a nitrifying liquid return pipe, a nitrifying liquid return pump is mounted on the nitrifying liquid return pipe, an inlet of the nitrifying liquid return pipe is connected with the aeration area, and an outlet of the nitrifying liquid return pipe is connected with the anoxic area.
6. The skid-mounted sewage treatment apparatus according to claim 4, wherein: the aeration zone and the anoxic zone are both in annular structures.
7. The skid-mounted sewage treatment apparatus according to claim 6, wherein: an anoxic zone air impeller is arranged in the anoxic zone, an aeration zone air impeller is arranged in the aeration zone with an annular structure, and an air stirring device is also arranged in the anaerobic zone.
8. The skid-mounted sewage treatment apparatus according to claim 6, wherein: the bottom of the aeration zone is provided with a plurality of aeration devices which are radially distributed and take the inner sewage treatment barrel as the center.
9. The skid-mounted sewage treatment apparatus according to claim 6, wherein: the sedimentation cylinder is internally provided with an inclined tube filler, the middle part of the sedimentation cylinder is provided with a middle water inlet pipe with the lower end positioned on the lower side of the inclined tube filler, the lower side of the inclined tube filler is provided with an inclined tube filler backwashing device, the upper end of the periphery of the sedimentation cylinder is provided with a water collecting tank, and the bottom of the sedimentation cylinder is provided with a sludge hopper and a sludge suction device.
10. The skid-mounted sewage treatment apparatus according to claim 8, wherein: sled dress formula sewage treatment plant still include to the air-blower of aeration equipment air feed is connected with the air on the air outlet of air-blower and is responsible for the line, is provided with gas flowmeter on the air is responsible for the line, links to each other through two air branch pipelines between air is responsible for the line and the aeration equipment, and the air is responsible for the line and is linked to each other through the cylinder for air mixing with each air branch pipeline, and the air branch pipeline links to each other through multichannel air blast branch pipe with corresponding aeration equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022094491.4U CN213388244U (en) | 2020-09-23 | 2020-09-23 | Sled dress formula sewage treatment plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022094491.4U CN213388244U (en) | 2020-09-23 | 2020-09-23 | Sled dress formula sewage treatment plant |
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| Publication Number | Publication Date |
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| CN213388244U true CN213388244U (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022094491.4U Active CN213388244U (en) | 2020-09-23 | 2020-09-23 | Sled dress formula sewage treatment plant |
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| CN (1) | CN213388244U (en) |
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