CN209493412U - A kind of chemical wastewater treatment device convenient for collecting waste water - Google Patents
A kind of chemical wastewater treatment device convenient for collecting waste water Download PDFInfo
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- CN209493412U CN209493412U CN201822254349.4U CN201822254349U CN209493412U CN 209493412 U CN209493412 U CN 209493412U CN 201822254349 U CN201822254349 U CN 201822254349U CN 209493412 U CN209493412 U CN 209493412U
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- settling tank
- fixedly connected
- reaction chamber
- wastewater treatment
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Abstract
The utility model discloses a kind of chemical wastewater treatment devices convenient for collecting waste water, it is related to chemical wastewater treatment technical field, it includes settling tank, the right side of the settling tank is fixedly connected with the left side of reaction chamber, the settling tank inside lap has filtering net cage, the left and right sides of the filtering net cage are fixedly connected to fixture block, and two fixture blocks are respectively engaged in the card slot opened up at left and right sides of settling tank upper surface, the lower surface of the fixture block and the upper surface of settling tank overlap, the front of the card slot inner wall is connected with slide cartridge, slide bar is slidably connected in the slide cartridge, slide bar is connected in the card hole that fixture block front opens up.This is convenient for the chemical wastewater treatment device for collecting waste water, pass through setting settling tank, filtering net cage, card hole, fixture block, slide cartridge and slide bar, do not need it is multiple to filtering net cage in clear up, sewage will not make troubles to the cleaning of staff, it facilitates staff to be collected sewage, meets the needs used.
Description
Technical field
The utility model relates to chemical wastewater treatment technical field, at specially a kind of wastewater from chemical industry convenient for collecting waste water
Manage device.
Background technique
Wastewater from chemical industry refer to chemical plant production product process produced in waste water, such as produce ethylene, polyethylene, rubber,
The oily waste water of the devices such as polyester, methanol, ethylene glycol, Oil Tank, space division air compression station, it is general reachable after biochemical treatment
To national secondary discharge standard, now due to the shortage of water resource, the water of discharge standard need to be up to using further depth
After reason, reach the recycling of industrial moisturizing requirement.
Wastewater from chemical industry is generally required by the bulky grain in waste water or after waste is collected filtering, anti-using reagent
Decontamination discharge should be adjusted.And the particulate collection in waste water get up it is very inconvenient, it is often necessary to being fished in sedimentation basin, sink
Sewage often stops the sight of salvage person in the pond of shallow lake, brings certain inconvenience to the salvaging of staff, drop
The low cleaning efficiency of staff, can not meet the needs used very well.
Utility model content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the utility model provides a kind of chemical wastewater treatment dress convenient for collecting waste water
Set, solve the particulate collection in waste water get up it is very inconvenient, it is often necessary to it is dirty in sedimentation basin to being fished in sedimentation basin
Water often stops the sight of salvage person, brings certain inconvenience to the salvaging of staff, reduces work
The cleaning efficiency of personnel can not meet the problem of use needs very well.
(2) technical solution
To achieve the above objectives, the technical scheme adopted by the utility model is that: it is a kind of convenient for collect waste water wastewater from chemical industry
Processing unit, including settling tank, the right side of the settling tank are fixedly connected with the left side of reaction chamber, are taken in the settling tank
Be connected to filtering net cage, the left and right sides of the filtering net cage are fixedly connected to fixture block, and two fixture blocks be respectively engaged with it is heavy
In the card slot opened up at left and right sides of the case upper surface of shallow lake, the lower surface of the fixture block and the upper surface of settling tank are overlapped, the card
The front of slot inner wall is connected with slide cartridge, and slide bar is slidably connected in the slide cartridge, and the slide bar is connected to what fixture block front opened up
In card hole, the slide bar front end is fixedly connected with handle, and the outer surface of the slide bar is socketed with spring, and the slide cartridge is just
Face is fixedly connected by spring with the back side of handle.
The lower surface of the precipitating chamber interior wall is fixedly connected with the first water pump, and the water inlet of first water pump is communicated with the
One drinking-water pipe, first drinking-water pipe are located in settling tank, one end phase of the water outlet and the first flow pipe of first water pump
Connection, the other end of first flow pipe pass through the right side of settling tank and the left side of reaction chamber and extend to reaction chamber
Interior, the upper surface of the reaction chamber is connected with bearing, and the bearing inner sleeve is connected to shaft, and the outer surface of the shaft, which is socketed with, to be stirred
Bar is mixed, the top of the shaft is fixedly connected with driven gear, and the driven gear is engaged with the outer surface of driving device, described
The lower surface of driving device is fixedly connected with the upper surface of reaction chamber, and the upper surface of the reaction chamber is connected with the second flow pipe,
The right end of second flow pipe is connected with the water outlet of the second water pump, the lower surface of second water pump and reaction chamber it is upper
Surface is fixedly connected, and the water inlet of second water pump at the top of the second drinking-water pipe and spray tank by being connected, the medical fluid
The left side of case and the right side of reaction chamber overlap, and the lower surface of the spray tank is fixedly connected with the upper surface of fixed plate, institute
The left side for stating fixed plate is fixedly connected with the right side of reaction chamber.
Preferably, the bottom end of second drinking-water pipe extends to the bottom of spray tank, and first flow pipe is located at stirring
The lower section of bar.
Preferably, the right side of the reaction chamber is connected with outlet valve, and outlet valve is located at the bottom of reaction chamber right side.
Preferably, the upper surface of the spray tank offers through-hole, is provided with tapered plug in the through-hole.
Preferably, the front of the reaction chamber is fixedly connected with power supply, and the front of the reaction chamber is fixedly connected with first
Switch and second switch, the front of the settling tank are fixedly connected with third switch, the output end of the power supply by conducting wire with
The input terminal electrical connection of first switch, second switch and third switch.
Preferably, the driving device includes motor, and the output shaft of the motor is fixedly connected with driving gear, the master
Moving gear is engaged with driven gear, and the lower surface of the motor body is fixedly connected with the upper surface of reaction chamber, the motor
Input terminal is electrically connected by conducting wire with the output end of first switch.
Preferably, first water pump is immersible pump, what the input terminal of first water pump was switched by conducting wire and third
The input terminal of output end electrical connection, second water pump is electrically connected by conducting wire with the output end of second switch.
Preferably, the shape of the filtering net cage is rectangle, and the size of filtering net cage and the size of settling tank match,
And the height for filtering net cage is less than the height of settling tank.
(3) beneficial effect
The utility model has the beneficial effects that:
1, should convenient for collect waste water chemical wastewater treatment device, by setting settling tank, filtering net cage, card hole, fixture block,
Slide cartridge and slide bar, sewage are discharged into filtering net cage, large particle and rubbish by being discharged into settling tank after filtering net cage filtering, when
When rubbish in filtering net cage is more, by pulling the handle grip moving slide-bar of two sides to remove card hole, the fixture block of two sides is pulled at this time
It drives filtering net cage to separate with settling tank, is taken out rubbish out of settling tank by filtering net cage to facilitate staff,
Do not need it is multiple to filtering net cage in clear up, sewage will not make troubles to the cleaning of staff, facilitate work
Make personnel to be collected sewage, meets the needs used.
2, should convenient for collect waste water chemical wastewater treatment device, by setting driving device, stirring rod, the second water pump and
Spray tank, motor output shaft rotation drive driving gear rotation, and driving gear drives driven gear and shaft rotation, shaft rotation
Stirring rod is driven to be stirred to react the sewage in case, the second pump working extracts neutralization examination by the second drinking-water pipe from spray tank
Agent, neutralization reagent are pumped into reaction chamber by the second flow pipe, and the sewage in reaction chamber passes through discharging after reacting with neutralization reagent
Valve discharge, so that sewage can accelerate the efficiency of sewage treatment, facilitate work faster with neutralization reagent hybrid reaction
Make the work of personnel.
It 3, should be convenient for the chemical wastewater treatment device of collection waste water, by the way that the first water pump is arranged, so that working as settling tank
After the completion of interior settlement of sewage, switched by operation third so that the first pump working send sewage by first out of settling tank
Water pipe is pumped into reaction chamber, is adjusted to facilitate staff to the sewage quantity in reaction chamber, it is excessive to avoid sewage
Or it is very few and sewage treatment is caused to be affected.
Detailed description of the invention
Fig. 1 is the schematic diagram of the section structure that the utility model is faced；
Fig. 2 is the structural schematic diagram that the utility model settling tank is overlooked；
Fig. 3 is the structural schematic diagram of part A amplification in Fig. 1；
Fig. 4 is the structural schematic diagram that the utility model spray tank is overlooked；
Fig. 5 is the structural schematic diagram that the utility model reaction chamber is faced.
In figure: 1 settling tank, 2 filtering net cages, 3 fixture blocks, 4 card holes, 5 card slots, 6 slide cartridges, 7 slide bars, 8 handles, 9 springs, 10 the
One water pump, 11 first drinking-water pipes, 12 first flow pipes, 13 reaction chambers, 14 bearings, 15 shafts, 16 driven gears, 17 driving dresses
It sets, 171 driving gears, 172 motors, 18 stirring rods, 19 second flow pipes, 20 second water pumps, 21 second drinking-water pipes, 22 medical fluids
Case, 23 through-holes, 24 tapered plugs, 25 fixed plates, 26 power supplys, 27 first switches, 28 second switches, 29 thirds switch, 30 outlet valves.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figs. 1-5, the utility model provides a kind of technical solution: a kind of chemical wastewater treatment convenient for collecting waste water
The right side of device, including settling tank 1, settling tank 1 is fixedly connected with the left side of reaction chamber 13, and the front of reaction chamber 13 is fixed
It is connected with power supply 26, the front of reaction chamber 13 is fixedly connected with first switch 27 and second switch 28, and the front of settling tank 1 is fixed
It is connected with third switch 29, the output end of power supply 26 passes through conducting wire and first switch 27, second switch 28 and third switch 29
Input terminal electrical connection, by setting first switch 27, second switch 28 and third switch 29, to facilitate staff to electricity
The operation of machine 172, the first water pump 10 and the second water pump 20, the right side of reaction chamber 13 are connected with outlet valve 30, and outlet valve 30
Positioned at the bottom of 13 right side of reaction chamber, by the way that outlet valve 30 is arranged, to facilitate the sewage that staff completes processing
It is discharged, 1 inside lap of settling tank, which has, filters net cage 2, and the shape of filtering net cage 2 is rectangle, and filters the size of net cage 2 and sink
The size of shallow lake case 1 matches, and the height for filtering net cage 2 is less than the height of settling tank 1, filters net cage 2 by setting, thus side
Just staff avoids and directly fishes in sewage directly to clearing up inside filtering net cage 2 after taking out filtering net cage 2
Rubbish bring is inconvenient, and the left and right sides of filtering net cage 2 are fixedly connected to fixture block 3, and two fixture blocks 3 be respectively engaged with it is heavy
In the card slot 5 opened up at left and right sides of 1 upper surface of shallow lake case, the lower surface of fixture block 3 and the upper surface of settling tank 1 are overlapped, in card slot 5
The front of wall is connected with slide cartridge 6, and slide bar 7 is slidably connected in slide cartridge 6, by setting slide cartridge 6 and slide bar 7, so that slide bar 7
Movement in slide cartridge 6 is more stable, and fixture block 3 can be connected in card slot 5 by slide bar 7, avoids filtering net cage 2 because dirty
Water buoyancy and separated with settling tank 1, improve the stability of filtering net cage 2, slide bar 7 is connected to the card hole 4 that 3 front of fixture block opens up
Interior, 7 front end of slide bar is fixedly connected with handle 8, and the outer surface of slide bar 7 is socketed with spring 9, by the way that spring 9 is arranged, avoids
Slide bar 7 is caused to remove card hole 4 because of accidentally touching, so that slide bar 7 and the clamping of card hole 4 are even closer, the front of slide cartridge 6 is logical
Spring 9 is crossed to be fixedly connected with the back side of handle 8.
The lower surface of 1 inner wall of settling tank is fixedly connected with the first water pump 10, and the water inlet of the first water pump 10 is communicated with first
Drinking-water pipe 11, the first water pump 10 are immersible pump, and the input terminal of the first water pump 10 passes through the output end of conducting wire and third switch 29 electricity
The input terminal of connection, the second water pump 20 is electrically connected by conducting wire with the output end of second switch 28, by the way that the first water pump 10 is arranged,
So that making the first water pump 10 work from heavy by operating third switch 29 after the completion of the settlement of sewage in settling tank 1
Sewage is pumped into reaction chamber 13 by the first flow pipe 12 in shallow lake case 1, to facilitate staff in reaction chamber 13
Sewage quantity is adjusted, and avoids that sewage is excessive or very few and sewage treatment is caused to be affected, and the first drinking-water pipe 11 is located at heavy
In shallow lake case 1, the water outlet of the first water pump 10 is connected with one end of the first flow pipe 12, and the other end of the first flow pipe 12 passes through
The right side of settling tank 1 and the left side of reaction chamber 13 simultaneously extend in reaction chamber 13, and the upper surface of reaction chamber 13 is connected with axis
14 are held, shaft 15 is socketed in bearing 14, by setting bearing 14 and shaft 15, so that shaft 15 turns in bearing 14
Dynamic more stable, so that the rotation of stirring rod 18 is more stable, the outer surface of shaft 15 is socketed with stirring rod 18, shaft 15
Top be fixedly connected with driven gear 16, driven gear 16 is engaged with the outer surface of driving device 17, and driving device 17 includes
Motor 172, the output shaft of motor 172 are fixedly connected with driving gear 171, and driving gear 171 is engaged with driven gear 16, motor
The lower surface of 172 fuselages is fixedly connected with the upper surface of reaction chamber 13, and the input terminal of motor 172 passes through conducting wire and first switch 27
Output end electrical connection, pass through setting driving device 17,172 output shaft of motor rotation drive driving gear 171 rotate, driving tooth
Wheel 171 drives driven gear 16 and shaft 15 to rotate, and the rotation of shaft 15 drives stirring rod 18 to be stirred to react the sewage in case 13, from
And enable sewage faster with neutralization reagent hybrid reaction, accelerate the efficiency of sewage treatment, the following table of driving device 17
Face is fixedly connected with the upper surface of reaction chamber 13, and the upper surface of reaction chamber 13 is connected with the second flow pipe 19, the second flow pipe 19
Right end be connected with the water outlet of the second water pump 20, the upper surface of the lower surface of the second water pump 20 and reaction chamber 13 is fixed to be connected
It connects, the water inlet of the second water pump 20 is connected by the second drinking-water pipe 21 with the top of spray tank 22, by the way that the second water pump is arranged
20, the work of the second water pump 20 extracts neutralization reagent by the second drinking-water pipe 21 from spray tank 22, and neutralization reagent is sent by second
Water pipe 19 is pumped into reaction chamber 13, without staff manually to dosing is carried out in reaction chamber 13, saves work
The physical strength of personnel facilitates the work of staff, and the bottom end of the second drinking-water pipe 21 extends to the bottom of spray tank 22, and first send
Water pipe 12 is located at the lower section of stirring rod 18, and by the way that the second drinking-water pipe 21 is arranged, and the second drinking-water pipe 21 extends to spray tank 22
Medical fluid can not be extracted completely when extracting medical fluid so as to avoid the second water pump 20, the waste of resource be avoided, by setting by bottom
The first flow pipe 12 is set, and the first flow pipe 12 is located at the lower section of stirring rod 18, is touched when so as to avoid the rotation of stirring rod 18
To the first flow pipe 12, the normal rotation of stirring rod 18 ensure that, the left side of spray tank 22 and the right side of reaction chamber 13 are taken
It connecing, the upper surface of spray tank 22 offers through-hole 23, tapered plug 24 is provided in through-hole 23, by the way that through-hole 23 and tapered plug 24 is arranged,
It is fixed to facilitate staff to medical fluid, the lower surface of spray tank 22 and the upper surface of fixed plate 25 is added in spray tank 22
Connection, the left side of fixed plate 25 is fixedly connected with the right side of reaction chamber 13.
The operating procedure of the utility model are as follows:
S1, sewage is discharged into settling tank 1, sewage enters in settling tank 1 after being filtered by filtering net cage 2, passes through operation
Third switch 29 makes the first water pump 10 work, and the first water pump 10 is passed through sewage out of settling tank 1 by the first drinking-water pipe 11
First flow pipe 12 is pumped into reaction chamber 13；
S2, by operating second switch 28 second water pump 20 is worked, the work of 20 second water pump 20 of the second water pump passes through
Second drinking-water pipe 21 extracts neutralization reagent from spray tank 22, and neutralization reagent is pumped into reaction chamber 13 by the second flow pipe 19,
By operating first switch 27 motor 172 is worked, the rotation of 172 output shaft of motor drives driving gear 171 to rotate, driving tooth
Wheel 171 drives driven gear 16 and shaft 15 to rotate, and the rotation of shaft 15 drives stirring rod 18 to be stirred to react the sewage in case 13, dirty
After water fully reacting, outlet valve 30 is opened by what processing in reaction chamber 13 was completed and drains discharge；
S3, served as rubbish in filter screen box 2 it is more when, by pulling the handle 8 of two sides to remove card hole 4 with moving slide-bar 7, this
The fixture block 3 of the two sides Shi Ladong drives filtering net cage 2 to separate with settling tank 1, after filtering the cleaning of the rubbish in net cage 2, first pulls open
Fixture block 3 is caught in card slot 5 by handle 8, and card hole 4 and slide bar 7 are in relative position, unclamp handle 8, and spring 9 utilizes itself pull strap
Dynamic handle 8 and slide bar 7 reset, fixed to complete after slide bar 7 is caught in card hole 4.
Above-described specific embodiment, to the purpose of this utility model, technical scheme and beneficial effects carried out into
One step is described in detail, it should be understood that being not used to limit the foregoing is merely specific embodiment of the present utility model
The utility model processed, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done,
It should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of chemical wastewater treatment device convenient for collecting waste water, including settling tank (1), it is characterised in that: the settling tank
(1) right side is fixedly connected with the left side of reaction chamber (13), and settling tank (1) inside lap has filtering net cage (2), described
The left and right sides of filtering net cage (2) are fixedly connected to fixture block (3), and two fixture blocks (3) are respectively engaged on settling tank (1)
In the card slot (5) opened up at left and right sides of surface, the lower surface of the fixture block (3) and the upper surface of settling tank (1) are overlapped, described
The front of card slot (5) inner wall is connected with slide cartridge (6), is slidably connected slide bar (7) in the slide cartridge (6), slide bar (7) clamping
In the card hole (4) that fixture block (3) front opens up, slide bar (7) front end is fixedly connected with handle (8), the slide bar (7)
Outer surface be socketed with spring (9), the front of the slide cartridge (6) is fixedly connected by spring (9) with the back side of handle (8)；
The lower surface of settling tank (1) inner wall is fixedly connected with the first water pump (10), the water inlet of first water pump (10)
It is communicated with the first drinking-water pipe (11), first drinking-water pipe (11) is located in settling tank (1), the water outlet of first water pump (10)
Mouth is connected with one end of the first flow pipe (12), and the other end of first flow pipe (12) passes through the right side of settling tank (1)
Face and the left side of reaction chamber (13) simultaneously extend in reaction chamber (13), and the upper surface of the reaction chamber (13) is connected with bearing
(14), it being socketed with shaft (15) in the bearing (14), the outer surface of the shaft (15) is socketed with stirring rod (18), and described turn
The top of axis (15) is fixedly connected with driven gear (16), and the driven gear (16) and the outer surface of driving device (17) are nibbled
It closes, the lower surface of the driving device (17) is fixedly connected with the upper surface of reaction chamber (13), the upper table of the reaction chamber (13)
Face is connected with the second flow pipe (19), and the right end of second flow pipe (19) is connected with the water outlet of the second water pump (20),
The lower surface of second water pump (20) is fixedly connected with the upper surface of reaction chamber (13), the water inlet of second water pump (20)
By being connected at the top of the second drinking-water pipe (21) and spray tank (22), the left side and reaction chamber (13) of the spray tank (22)
Right side overlap joint, the lower surface of the spray tank (22) is fixedly connected with the upper surface of fixed plate (25), the fixed plate
(25) left side is fixedly connected with the right side of reaction chamber (13).
2. a kind of chemical wastewater treatment device convenient for collecting waste water according to claim 1, it is characterised in that: described the
The bottom end of two drinking-water pipes (21) extends to the bottom of spray tank (22), and first flow pipe (12) is located under stirring rod (18)
Side.
3. a kind of chemical wastewater treatment device convenient for collecting waste water according to claim 1, it is characterised in that: described anti-
The right side of case (13) is answered to be connected with outlet valve (30), and outlet valve (30) is located at the bottom of reaction chamber (13) right side.
4. a kind of chemical wastewater treatment device convenient for collecting waste water according to claim 1, it is characterised in that: the medicine
The upper surface of liquid case (22) offers through-hole (23), is provided with tapered plug (24) in the through-hole (23).
5. a kind of chemical wastewater treatment device convenient for collecting waste water according to claim 1, it is characterised in that: described anti-
Answer the front of case (13) to be fixedly connected with power supply (26), the front of the reaction chamber (13) be fixedly connected with first switch (27) and
Second switch (28), the front of the settling tank (1) are fixedly connected with third switch (29), and the output end of the power supply (26) is logical
Conducting wire is crossed to be electrically connected with the input terminal of first switch (27), second switch (28) and third switch (29).
6. a kind of chemical wastewater treatment device convenient for collecting waste water according to claim 5, it is characterised in that: the drive
Dynamic device (17) include motor (172), and the output shaft of the motor (172) is fixedly connected with driving gear (171), the active
Gear (171) is engaged with driven gear (16), and the lower surface of motor (172) fuselage and the upper surface of reaction chamber (13) are fixed
The input terminal of connection, the motor (172) is electrically connected by conducting wire with the output end of first switch (27).
7. a kind of chemical wastewater treatment device convenient for collecting waste water according to claim 5, it is characterised in that: described the
One water pump (10) is immersible pump, and the input terminal of first water pump (10) is electrically connected by the output end of conducting wire and third switch (29)
It connects, the input terminal of second water pump (20) is electrically connected by conducting wire with the output end of second switch (28).
8. a kind of chemical wastewater treatment device convenient for collecting waste water according to claim 1, it is characterised in that: the mistake
The shape of filter screen box (2) is rectangle, and the size of filtering net cage (2) and the size of settling tank (1) match, and filter net cage
(2) height is less than the height of settling tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822254349.4U CN209493412U (en) | 2018-12-29 | 2018-12-29 | A kind of chemical wastewater treatment device convenient for collecting waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822254349.4U CN209493412U (en) | 2018-12-29 | 2018-12-29 | A kind of chemical wastewater treatment device convenient for collecting waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209493412U true CN209493412U (en) | 2019-10-15 |
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ID=68154405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822254349.4U Active CN209493412U (en) | 2018-12-29 | 2018-12-29 | A kind of chemical wastewater treatment device convenient for collecting waste water |
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| Country | Link |
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| CN (1) | CN209493412U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110668604A (en) * | 2019-10-18 | 2020-01-10 | 徐春霞 | Fine chemical wastewater treatment device |
| CN112627236A (en) * | 2020-12-18 | 2021-04-09 | 常德市两栖建筑工程有限公司 | Maintainable drainage system of single-line submarine tunnel |
-
2018
- 2018-12-29 CN CN201822254349.4U patent/CN209493412U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110668604A (en) * | 2019-10-18 | 2020-01-10 | 徐春霞 | Fine chemical wastewater treatment device |
| CN112627236A (en) * | 2020-12-18 | 2021-04-09 | 常德市两栖建筑工程有限公司 | Maintainable drainage system of single-line submarine tunnel |
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