CN113914799A - Construction system that drilling bored concrete pile just, reverse circulation combined together - Google Patents
Construction system that drilling bored concrete pile just, reverse circulation combined together Download PDFInfo
- Publication number
- CN113914799A CN113914799A CN202111140023.9A CN202111140023A CN113914799A CN 113914799 A CN113914799 A CN 113914799A CN 202111140023 A CN202111140023 A CN 202111140023A CN 113914799 A CN113914799 A CN 113914799A
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- Prior art keywords
- pipeline
- mud
- screen
- vibrating screen
- valve
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 238000005553 drilling Methods 0.000 title claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 26
- 238000011065 in-situ storage Methods 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 38
- 230000035939 shock Effects 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009288 screen filtration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/02—Combinations of filters of different kinds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Cyclones (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention provides a construction system combining forward circulation and reverse circulation of a bored pile, which comprises a drilling machine, a pile casing, a mud tank, a mud pump, a screen filtering device, a vibrating screen, a mud receiving disc and a cyclone sand remover, wherein the drilling machine, the pile casing, the mud tank, the mud pump, the screen filtering device, the vibrating screen, the mud receiving disc and the cyclone sand remover are connected with each other by a pipeline and a valve for forward circulation and reverse circulation processes of the bored pile. The cast-in-situ bored pile construction system can select forward circulation or reverse circulation construction under different geological conditions, is suitable for complex geological conditions, improves the construction efficiency and ensures the quality of formed holes.
Description
Technical Field
The invention relates to the technical field of cast-in-situ bored piles, in particular to a construction system combining forward circulation and reverse circulation of cast-in-situ bored piles.
Background
The development of buildings, traffic and municipal engineering such as super high-rise buildings, large-span bridges and the like enables the foundation load of the buildings to be larger and larger, higher requirements on the bearing capacity and deformation of the foundation are provided, the diameter of an engineering pile is continuously enlarged, the pile foundation is deeper and deeper, the faced geological conditions are also more and more complex, particularly in soft soil areas, the properties of upper and lower soil layers have larger differences, the existing construction requirements are difficult to meet through the original construction process, the hole forming efficiency is low, and the hole forming quality is not ideal.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention mainly aims to solve the technical problems that the existing cast-in-situ bored pile construction system cannot meet the construction requirements of geological conditions at different depths, the hole forming rate is low, and the hole forming quality is not ideal.
The invention provides a construction system combining forward circulation and reverse circulation of a cast-in-situ bored pile, which comprises a drilling machine, a pile casing, a slurry tank, a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone desander, wherein the drilling machine is arranged at a pile position, the pile casing is connected with a pile hole through a first pipeline, and the pile casing is connected with the slurry pump and the slurry tank through a second pipeline and a third pipeline respectively;
a fourth pipeline is connected between the mud pump and the screen filtering device, the vibrating screen is adjacent to the screen filtering device and used for receiving mud processed by the screen filtering device for further processing, the mud receiving disc is arranged below the vibrating screen, and a fifth pipeline is connected between the mud receiving disc and the mud tank; the mud pump comprises a turbine volute, a driving motor and a motor speed regulator, and the vibrating screen comprises a screen bucket and a first shock exciter arranged on the screen bucket through a cross beam;
a first valve is arranged on the second pipeline, a second valve is arranged on the third pipeline, a fifth valve is arranged on the fourth pipeline, and a sixth valve is arranged on the fifth pipeline;
a feed port of the cyclone desander is connected with the fourth pipeline between the mud pump and the fifth valve through a sixth pipeline, a top flow port of the cyclone desander flows to the mud receiving disc through a seventh pipeline, and a bottom flow port of the cyclone desander flows to the vibrating screen through an eighth pipeline;
a seventh valve is arranged on the sixth pipeline; a ninth pipeline is connected to an upper branch of the sixth pipeline between the seventh valve and the mud pump, the ninth pipeline is connected with a drill rod of the drilling machine, and an eighth valve is arranged on the ninth pipeline; and the mud pump is connected with the ninth pipeline between the eighth valve and the drill rod through a tenth pipeline, and the tenth pipeline is provided with a ninth valve.
In an optional embodiment of the invention, the vibrating screen is obliquely arranged on the slurry receiving disc, the cyclone desander is erected above the vibrating screen through a bracket, and the number of the cyclone desander is 2.
In an alternative embodiment of the present invention, the mud pump, the screen filter device, the vibrating screen, the mud receiving pan, and the cyclone are all disposed on a crawler-type carrier.
In an alternative embodiment of the invention, the screen filtering device comprises a box body, a slurry inlet arranged at the top of the box body, a filter screen obliquely arranged in the box body and used for filtering coarse sand in slurry, and a sliding plate hinged with the bottom of the box body and used for guiding the coarse sand filtered by the filter screen to be discharged; the mud pump is connected with the mud inlet pipeline, and a mud outlet used for enabling filtered mud to flow to the vibrating screen is formed in the box body below the filter screen.
In an alternative embodiment of the invention, a mud guard for preventing mud from splashing from the mud inlet is arranged at the top of the box body, and a second shock exciter is arranged on the side wall of the box body.
In an alternative embodiment of the present invention, the filter screen includes a first filter portion adjacent to the side of the slurry inlet, and a second filter portion adjacent to the side of the sliding plate, wherein the filter holes of the first filter portion are elongated, and the filter holes of the second filter portion are circular.
In an optional embodiment of the invention, the vibrating screen comprises a first vibrating screen and a second vibrating screen engaged with the first vibrating screen, and both the underflow port of the cyclone sand remover and the mud outlet on the box body flow to the first vibrating screen.
In an optional embodiment of the present invention, each of the first vibrating screen and the second vibrating screen is provided with a spray pipe for cleaning the screen material.
Has the advantages that: the invention provides a construction system combining forward circulation and reverse circulation of a bored pile, which comprises a drilling machine, a pile casing, a mud tank, a mud pump, a screen filtering device, a vibrating screen, a mud receiving disc and a cyclone sand remover, wherein the drilling machine, the pile casing, the mud tank, the mud pump, the screen filtering device, the vibrating screen, the mud receiving disc and the cyclone sand remover are connected with each other by a pipeline and a valve for forward circulation and reverse circulation processes of the bored pile. The cast-in-situ bored pile construction system can select forward circulation or reverse circulation construction under different geological conditions, is suitable for complex geological conditions, improves the construction efficiency and ensures the quality of formed holes.
Drawings
Fig. 1 is a schematic structural diagram of a construction system combining forward circulation and reverse circulation of a cast-in-situ bored pile according to the present invention.
Fig. 2 is a schematic structural diagram of a crawler-type transport vehicle loaded with a screen filtering device.
Fig. 3 is a schematic structural diagram of a screen filtering device according to the present invention.
Figure 4 is a cross-sectional view of a screen filter arrangement of the present invention.
The reference numbers are as follows:
10-a drilling machine; 20-protecting the cylinder; 30-a mud tank; 40-a slurry pump; 50-screen filtration unit; 60-vibrating screen; 70-slurry receiving disc; 80-cyclone desander; 90-a first conduit; 100-pile hole; 110-a second conduit; 120-a third conduit; 130-a fourth conduit; 410-a turbine volute; 420-a drive motor; 430-motor speed controller; 440-a first shaker; 140-a fifth conduit; 150-a first valve; 160-a second valve; 170-a fifth valve; 180-a sixth valve; 190-a feed inlet; 200-a sixth conduit; 210-top flow port; 220-a seventh conduit; 230-underflow port; 240-an eighth conduit; 250-a seventh valve; 260-a ninth conduit; 270-an eighth valve; 280-a tenth conduit; 400-a ninth valve; 290-tracked carrier; 300-a box body; 310-a mud inlet; 320-a filter screen; 330-a sliding plate; 340-a mud outlet; 450-a mudguard; 460-a second shaker; 350-a first filter part; 360-a second filter part; 470-slide carriage; 370-a first vibrating screen; 380-a second vibrating screen; 390-shower pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a construction system combining forward and reverse circulation of a bored pile, including a drilling rig 10, a pile casing 20, a mud tank 30, a mud pump 40, a screen filtering device 50, a vibrating screen 60, a mud receiving plate 70 and a cyclone desander 80, wherein the drilling rig 10 is disposed at a pile location, the pile casing 20 is connected to a pile hole 100 through a first pipe 90, the pile casing 20 is connected to the mud pump 40 and the mud tank 30 through a second pipe 110 and a third pipe 120, respectively, and a fourth pipe 130 is connected between the mud pump 40 and the screen filtering device 50;
referring to fig. 2, the shaker 60 is adjacent to the screen filter 50 and is configured to receive the slurry processed by the screen filter 50 for further processing, and the slurry receiving pan 70 is disposed below the shaker 60; the mud pump 40 comprises a turbine volute 410, a driving motor 420 and a motor speed regulator 430, and the vibrating screen 60 comprises a screen bucket and a first shock exciter 440 arranged on the screen bucket through a cross beam;
referring to fig. 1, a fifth pipe 140 is connected between the slurry receiving tray 70 and the slurry tank 30, a first valve 150 is disposed on the second pipe 110, a second valve 160 is disposed on the third pipe 120, a fifth valve 170 is disposed on the fourth pipe 130, and a sixth valve 180 is disposed on the fifth pipe 140;
referring to fig. 1 and 2, the feed port 190 of the cyclone desander 80 is connected to the fourth pipe 130 between the mud pump 40 and the fifth valve 170 through a sixth pipe 200, the top flow port 210 of the cyclone desander 80 flows to the mud receiving plate through a seventh pipe 220, and the bottom flow port 230 of the cyclone desander 80 flows to the vibrating screen through an eighth pipe 240;
referring to fig. 1, a seventh valve 250 is disposed on the sixth pipeline; a ninth pipeline 260 is connected to the upper branch of the sixth pipeline between the seventh valve 250 and the mud pump 40, the ninth pipeline 260 is connected to a drill rod of the drilling rig 10, and an eighth valve 270 is arranged on the ninth pipeline 260; the mud pump 40 is further connected to the ninth pipe 260 between the eighth valve 270 and the drill pipe through a tenth pipe 280, and a ninth valve 400 is provided on the tenth pipe 280.
The construction system combining the forward circulation and the reverse circulation of the cast-in-situ bored pile comprises a forward circulation mode and a reverse circulation mode, wherein the mud in the forward circulation mode moves from the pile hole 100 → the pile casing 20 → the mud pump 40 → the drill rod → the drill bit → the pile hole 100 → the pile casing 20, and the forward circulation drilling is mainly suitable for drilling in stratums such as a quicksand layer, a pebble layer, a sand layer, a permeable layer and the like; the mud in the reverse circulation mode is in the direction of a pile hole 100 → a drill bit → a drill rod → a mud pump 40 → a screen filter device 50 → a vibrating screen 60 → a mud receiving disc 70 → a mud box 70 → a casing 20 → a pile hole 100, the reverse circulation drilling is mainly suitable for drilling in strata other than the forward circulation, and the cyclone desander 80 can be started to carry out sand separation synchronization in the reverse circulation drilling process, namely, the mud flowing to the screen filter device 50 from the mud pump 40 simultaneously flows into the cyclone desander 80, then the separated fine sand flows to the vibrating screen 60, and the separated mud flows into the mud receiving disc 70.
Referring to fig. 2, in an alternative embodiment of the present invention, the vibrating screen 60 is obliquely arranged on the slurry receiving tray 70, the cyclone desander 80 is erected above the vibrating screen 60 by a bracket, and 2 cyclone desanders 80 are arranged.
Referring to fig. 2, in an alternative embodiment of the present invention, the mud pump 40, the screen filter 50, the shaker 60, the mud receiving pan 70, and the cyclone 80 are all disposed on a tracked vehicle 290. In the embodiment, the construction system combining the forward circulation and the reverse circulation of the cast-in-situ bored pile can be conveniently moved and flexibly arranged.
Referring to fig. 3, in an alternative embodiment of the present invention, the screen filtering apparatus 50 includes a housing 300, a slurry inlet 310 disposed at the top of the housing 300, a screen 320 disposed in the housing 300 in an inclined manner for filtering coarse sand in slurry, and a slide plate 330 hinged to the bottom of the housing 300 for guiding the coarse sand filtered by the screen 320 to be discharged; the mud pump 40 is connected to the mud inlet 310 through a pipe, and a mud outlet 340 through which filtered mud flows to the vibrating screen 60 is formed in the case 300 under the filter screen 320.
Referring to fig. 3, in an alternative embodiment of the present invention, a mud guard 450 for preventing mud from splashing from the mud inlet 310 is provided at the top of the tank 300, and a second shock absorber 460 is provided on a sidewall of the tank 300.
Referring to fig. 3, in an alternative embodiment of the present invention, the filter screen 320 includes a first filter portion 350 adjacent to one side of the slurry inlet 310 and a second filter portion 360 adjacent to one side of the sliding plate 330, wherein the filter holes of the first filter portion 350 are elongated and the filter holes of the second filter portion 360 are circular. In this embodiment, the main function of the elongated filtering holes of the first filtering portion 350 is to prevent the sludge eluted from the sand from blocking the filtering holes, and simultaneously reduce the contact friction to guide the washed sand to move downward quickly, and the circular filtering holes of the second filtering portion 360 can prevent the washed large sand from falling under the filtering net 320.
Referring to fig. 4, a chute 470 for guiding the slurry to the slurry outlet 340 is provided in the casing 300 below the first filter part 350. In this embodiment, the height of the mud outlet 340 from the bottom of the casing 300 is a certain height, and the side of the slide carriage 470 located at the mud outlet 340 is lower than the bottom edge of the mud outlet 340, so as to prevent the large sand falling into the casing 300 from flowing into the subsequent vibrating screen, and only allow the fine sand of small particles to flow to the vibrating screen 60, and the slide carriage 470 is mainly arranged to make the fine particles in the filtered mud finally flowing to the vibrating screen for subsequent recovery.
Referring to fig. 4, in an alternative embodiment of the present invention, a drain port is provided on a bottom plate of the case 300 under the second filter part 360, and a valve is installed on the drain port. The valve can facilitate the discharge of the slurry accumulated in the box and the cleaning of the large sand in the screen filtering device.
Referring to FIG. 2, in an alternative embodiment of the present invention, the vibrating screens 60 include a first vibrating screen 370 and a second vibrating screen 380 engaged with the first vibrating screen 370, and both the underflow opening 230 of the cyclone desander 80 and the mud outlet 340 of the box 300 are directed to the first vibrating screen 370. In this embodiment, the vibrating screen 60 is provided with 2 places which can make fine sand better separated from mud, and simultaneously, the vibrating screen can be better cleaned by matching with a spraying pipeline.
Referring to fig. 2, in an alternative embodiment of the present invention, each of the first vibrating screen 370 and the second vibrating screen 380 is provided with a spraying pipe 390 for cleaning the screen material.
In conclusion, the invention provides a construction system combining forward circulation and reverse circulation of a bored pile, which comprises a drilling machine, a pile casing, a slurry tank, a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone sand remover, wherein the drilling machine, the pile casing, the slurry tank, the slurry pump, the screen filtering device, the vibrating screen, the slurry receiving disc and the cyclone sand remover are connected with each other by using pipelines and valves according to forward circulation and reverse circulation processes of the bored pile. The cast-in-situ bored pile construction system can select forward circulation or reverse circulation construction under different geological conditions, is suitable for complex geological conditions, improves the construction efficiency and ensures the quality of formed holes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A construction system combining forward circulation and reverse circulation of a bored pile is characterized by comprising a drilling machine, a pile casing, a slurry tank, a slurry pump, a screen filtering device, a vibrating screen, a slurry receiving disc and a cyclone desander, wherein the drilling machine is arranged at a pile position, the pile casing is connected with a pile hole through a first pipeline, and the pile casing is connected with the slurry pump and the slurry tank through a second pipeline and a third pipeline respectively;
a fourth pipeline is connected between the mud pump and the screen filtering device, the vibrating screen is adjacent to the screen filtering device and used for receiving mud processed by the screen filtering device for further processing, the mud receiving disc is arranged below the vibrating screen, and a fifth pipeline is connected between the mud receiving disc and the mud tank; the mud pump comprises a turbine volute, a driving motor and a motor speed regulator, and the vibrating screen comprises a screen bucket and a first shock exciter arranged on the screen bucket through a cross beam;
a first valve is arranged on the second pipeline, a second valve is arranged on the third pipeline, a fifth valve is arranged on the fourth pipeline, and a sixth valve is arranged on the fifth pipeline;
a feed port of the cyclone desander is connected with the fourth pipeline between the mud pump and the fifth valve through a sixth pipeline, a top flow port of the cyclone desander flows to the mud receiving disc through a seventh pipeline, and a bottom flow port of the cyclone desander flows to the vibrating screen through an eighth pipeline;
a seventh valve is arranged on the sixth pipeline; a ninth pipeline is connected to an upper branch of the sixth pipeline between the seventh valve and the mud pump, the ninth pipeline is connected with a drill rod of the drilling machine, and an eighth valve is arranged on the ninth pipeline; and the mud pump is connected with the ninth pipeline between the eighth valve and the drill rod through a tenth pipeline, and the tenth pipeline is provided with a ninth valve.
2. The bored pile forward and backward circulation combined construction system according to claim 1, wherein the vibrating screen is obliquely disposed on the slurry receiving tray, the cyclone sand remover is erected above the vibrating screen by a bracket, and the number of the cyclone sand remover is 2.
3. The system for constructing the bored pile by combining the forward circulation and the reverse circulation according to claim 1 or 2, wherein the mud pump, the screen filtering device, the vibrating screen, the mud receiving disc and the cyclone are all provided on a crawler-type carrier vehicle.
4. The bored pile forward and backward circulation combined construction system according to claim 3, wherein the screen filtering device includes a box, a slurry inlet provided at a top of the box, a screen obliquely provided in the box for filtering coarse sand in slurry, and a slide plate hinged to a bottom of the box for guiding the coarse sand filtered by the screen to be discharged; the mud pump is connected with the mud inlet pipeline, and a mud outlet used for enabling filtered mud to flow to the vibrating screen is formed in the box body below the filter screen.
5. The bored pile forward and backward circulation combined construction system according to claim 4, wherein a mud guard for preventing mud from splashing is provided at a top of the box body, and a second shock absorber is provided on a side wall of the box body.
6. The cast-in-situ bored pile forward and backward circulation combined construction system according to claim 5, wherein the filter net includes a first filter portion adjacent to the side of the slurry inlet, and a second filter portion adjacent to the side of the slide plate, and the filter holes of the first filter portion are elongated and the filter holes of the second filter portion are circular.
7. The bored pile forward and reverse circulation combined construction system according to claim 6, wherein the vibrating screens include a first vibrating screen and a second vibrating screen engaged with the first vibrating screen, and both the underflow port of the cyclone sand remover and the slurry outlet of the box body flow to the first vibrating screen.
8. The cast-in-situ bored pile forward and backward circulation combined construction system according to claim 7, wherein each of the first and second vibrating screens is provided with a spray pipe for cleaning the screen material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111140023.9A CN113914799A (en) | 2021-09-28 | 2021-09-28 | Construction system that drilling bored concrete pile just, reverse circulation combined together |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111140023.9A CN113914799A (en) | 2021-09-28 | 2021-09-28 | Construction system that drilling bored concrete pile just, reverse circulation combined together |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113914799A true CN113914799A (en) | 2022-01-11 |
Family
ID=79236590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111140023.9A Withdrawn CN113914799A (en) | 2021-09-28 | 2021-09-28 | Construction system that drilling bored concrete pile just, reverse circulation combined together |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113914799A (en) |
-
2021
- 2021-09-28 CN CN202111140023.9A patent/CN113914799A/en not_active Withdrawn
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Application publication date: 20220111 |
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| WW01 | Invention patent application withdrawn after publication |