CN110171836B - Automatic feeding and discharging device for salt-making brine - Google Patents
Automatic feeding and discharging device for salt-making brine Download PDFInfo
- Publication number
- CN110171836B CN110171836B CN201910404315.5A CN201910404315A CN110171836B CN 110171836 B CN110171836 B CN 110171836B CN 201910404315 A CN201910404315 A CN 201910404315A CN 110171836 B CN110171836 B CN 110171836B
- Authority
- CN
- China
- Prior art keywords
- lock pin
- flashboard
- water
- switch
- positioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 36
- 239000012267 brine Substances 0.000 title claims abstract description 35
- 238000007599 discharging Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims description 20
- 230000008020 evaporation Effects 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 14
- 150000003839 salts Chemical class 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Barrages (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses an automatic salt-making brine supply and discharge device, which comprises a U-shaped water trough arranged on a low-level bank between an upstream and a downstream, wherein the U-shaped water trough is provided with a hinged rotating shaft, a lower cross beam is arranged below the U-shaped water trough, a circular continuous flashboard is arranged on the rotating shaft, three flashboards are uniformly arranged on the circular continuous flashboard along the axial direction, a switch lock pin rotating disc is arranged on one side of the circular continuous flashboard, three positioning grooves are uniformly arranged on the switch lock pin rotating disc, and switch lock pins and water passing positioning lock pins are arranged at the positioning grooves; one side of the U-shaped water passing groove is provided with a buoy with a counterweight, and the buoy is respectively connected with the switch brake lock pin and the water passing positioning lock pin through a guy cable wire; the invention has the advantages that: the automatic opening and closing device has the advantages that the water level is not needed to be observed by workers at the mouth, the opening and closing of the valve are automatically and accurately realized according to the set water level, the labor emphasis is reduced, and the working efficiency is improved.
Description
Technical Field
The invention relates to a feeding and discharging device, in particular to an automatic feeding and discharging device for salt-making brine, and belongs to the field of feeding and discharging devices.
Background
The salt-making brine is prepared by concentrating the water containing salt into a reservoir by adopting moisture or extracting groundwater containing salt, and then preparing salt by using a fractional evaporation process to reach the crystallization concentration.
In the process of the fractional evaporation technology, a water pump is utilized by a 'running worker' to pump brine with a certain concentration into the highest brine pool of an upstream brine making unit, the upstream and downstream evaporation pools are designed with natural fall, the brine is evaporated step by step through the evaporation pools with different concentrations, the brine is evaporated to saturated brine, and the brine is crystallized in a crystallization pool to form crude salt.
In the step-by-step steaming process, a running worker opens a gate according to the water level of the brine pond to inject brine into the downstream evaporation brine pond, and closes the gate to stop water injection when the required water level is observed. In the process, the water level gate opening and closing are frequently observed by a gate runner. The labor intensity of the mouth running worker is extremely high and the water level is unstable to master.
Disclosure of Invention
In order to solve the problems, the invention designs the automatic salt-making brine feeding and discharging device, which can automatically and accurately open and close the gate according to the set water level without observing the water level by a worker at a running port, thereby reducing labor emphasis and improving working efficiency.
The technical scheme of the invention is as follows:
the automatic salt-making brine supply and discharge device comprises a U-shaped water passing groove arranged on a low-heat-transfer pond between the upstream and the downstream, wherein the U-shaped water passing groove is provided with a hinged rotating shaft, a lower cross beam is arranged below the U-shaped water passing groove, a circular continuous flashboard is arranged on the rotating shaft, three flashboards are uniformly arranged on the circular continuous flashboard along the axial direction, a switch lock pin rotating disc is arranged on one side of the circular continuous flashboard, three positioning grooves are uniformly arranged on the switch lock pin rotating disc, and switch lock pins and water passing positioning lock pins are arranged at the positioning grooves; the U-shaped water passing groove is characterized in that a buoy with a counterweight is arranged on one side of the U-shaped water passing groove, and the buoy is respectively connected with the switch brake lock pin and the water passing positioning lock pin through inhaul cable wires.
And a hydraulic expansion sealing strip is arranged between the circular continuous flashboard and the lower cross beam.
The opening of the switch lock pin and the opening of the water passing positioning lock pin are uniformly distributed on the periphery of the switch lock pin rotating disc, and an included angle is 120 degrees; the initial sealing position of the first flashboard has an included angle of 30 degrees with the lead weight direction, the circular continuous flashboard rotates for 30 degrees, and the water-feeding positioning lock pin falls into the positioning groove; the circular continuous flashboard rotates 90 degrees again, and the switch brake lock pin returns to a positioning groove.
When the water level of the downstream evaporation pond drops to a certain water level due to the requirement, the buoy with the counterweight pulls the pull rope, the pull rope pulls the switch gate lock pin, under the action of upstream water pressure, the first gate plate of the circular continuous gate plate is pushed open, the water passing positioning lock pin rotates for 30 degrees, the brine flows into the downstream evaporation pond through the upper part of the lower beam, and meanwhile, the second gate plate of the circular continuous gate plate rotates to a proper position and is controlled by the water passing positioning lock pin; when water is injected to a set water level, the buoy pulls the inhaul cable line to pull the switch brake positioning lock pin, the circular continuous flashboard rotates 90 degrees, the switch brake lock pin returns to the positioning groove, the brake is closed, meanwhile, the flashboard and the lower cross beam are positioned on the same axis, the sealing strip is expanded by pressurized water, and under the action that the upstream water pressure is greater than the downstream water pressure, the transverse sealing strip is expanded by water injection, clings to the lower part of the flashboard, and upstream brine leakage is stopped. When the evaporation is carried out again to the lower limit, the second flashboard of the circular continuous flashboard is opened again, and the repeated automatic brine feeding and discharging function is formed.
Furthermore, the U-shaped water trough is provided with a sundry interception grate in the water facing direction, so that sundries are prevented from entering the device when the gate is opened.
Further, a water-stopping sealing strip is arranged between the U-shaped water passing groove and the gap of the circular continuous flashboard.
The beneficial effects of the invention are as follows: the automatic opening and closing device has the advantages that the water level is not needed to be observed by workers at the mouth, the opening and closing of the valve are automatically and accurately realized according to the set water level, the labor emphasis is reduced, and the working efficiency is improved.
The invention is further described below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of a buoy according to an embodiment of the present invention;
FIG. 4 is a diagram showing the lock pin in place according to an embodiment of the present invention;
FIG. 5 is a standby state diagram of the lock pin according to the embodiment of the present invention;
FIG. 6 is a drawing showing the state of the lock pin pulled out according to the embodiment of the present invention;
in the figure: the device comprises a 1-U-shaped water passing tank, a 2-sundry interception grate, a 3-rotating shaft, a 4-lower cross beam, a 5-circular continuous flashboard, a 6-switch lock pin for rotating, a 7-positioning groove, an 8-water stop sealing strip, a 9-water pressure expansion sealing strip, a 10-buoy, a 11-guy wire, a 12-switch lock pin, a 13-water passing positioning lock pin, a 14-first flashboard, a 15-second flashboard and a 16-closed maintenance flashboard.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and explanation only and is not intended to limit the present invention.
Example 1
As shown in fig. 1-3, an automatic salt-making brine feeding and discharging device comprises a U-shaped water passing groove 1 arranged on a pool bank between an upstream and a downstream, wherein a sundry interception grate 2 is arranged in the water facing direction of the U-shaped water passing groove to prevent sundries from entering the device when the device is opened, a rotating shaft 3 which is fixed on two sides and parallel to the bottom of the U-shaped water passing groove 1 is arranged in the U-shaped water passing groove, a lower cross beam 4 is arranged below the U-shaped water passing groove 1, two ends of the rotating shaft 3 are connected with two side vertical beams of the U-shaped water passing groove 1, a circular continuous flashboard 5 is arranged on the rotating shaft 3, three flashboard blocks are uniformly arranged on one side (on one side of the lockpin rotating disc, combined with on-site determination) of the circular continuous flashboard 5, a switch lockpin rotating disc 6 is uniformly arranged on the switch lockpin rotating disc 6, and a switch lockpin 12 and a water passing positioning 13 (the included angle between the switch lockpin 12 and the lockpin and the bayonet is 90 degrees with the center of the circle center of the bayonet are arranged at the position of the positioning groove 7); a water stop sealing strip 8 is arranged between the U-shaped water passing groove 1 and the gap of the circular continuous flashboard 5, and a water pressure expansion sealing strip 9 is arranged between the circular continuous flashboard 5 and the lower cross beam 4; the U-shaped water trough 1 is provided with a float 10 with a counterweight on one side, the float 10 is respectively connected with a switch gate lock pin 12 and a water passing positioning lock pin 13 through a pull rope wire 11, when the water level of a downstream evaporation pool is lowered to a certain water level due to the requirement, the float 10 with the counterweight pulls the pull rope wire 11, the pull rope wire 11 pulls the switch gate lock pin 12, under the action of upstream water pressure, a first block gate plate 14 of a circular continuous gate plate 5 is pushed open, the rotation is carried out by 30 degrees, the water passing positioning lock pin 13 falls into a positioning groove 7, brine flows into the downstream evaporation pool through the upper part of a lower cross beam 4, and meanwhile, a second block gate plate 15 of the circular continuous gate plate 5 is rotated to a proper position (rotated by 30 degrees) and is controlled by the water passing positioning lock pin 13; when water is injected to a set water level (the pulling stroke is set according to production requirements), the buoy 10 pulls the pulling rope line 11 to pull the switch gate positioning lock pin 12, the circular continuous flashboard rotates 90 degrees, the switch gate lock pin 12 returns to the positioning groove 7, the circular continuous flashboard is closed, meanwhile, the circular continuous flashboard and the lower cross beam 4 are positioned on the same axis, and the water pressure expansion sealing strip 9 is subjected to the action that the upstream water pressure is greater than the downstream water pressure, so that the transverse sealing strip of the water pressure expansion sealing strip is injected and expanded, clings to the lower part of the circular continuous flashboard, and upstream brine leakage is stopped. When the evaporation is carried out again to the lower limit, the second block of shutters 15 of the circular continuous shutters are opened again, so that the repeated automatic brine feeding and discharging function is formed.
The opening of the switch lock pin and the opening of the water passing positioning lock pin are uniformly distributed on the periphery of the switch lock pin rotating disc, and an included angle is 120 degrees; the initial sealing position of the first flashboard has an included angle of 30 degrees with the plumb line direction, the circular continuous flashboard rotates for 30 degrees, and the water-running positioning lock pin falls into the positioning groove; the circular continuous flashboard rotates 90 degrees again, and the switch brake lock pin returns to a positioning groove.
As shown in fig. 4, the locking pin is tightly engaged with the positioning groove. As shown in fig. 5, the locking pin is ready to engage the detent under its own weight. As shown in fig. 6, the locking pin is separated from the engaged state by the pull of the pull wire.
In addition, the buoy is arranged in the buoy vertical shaft, and the bottom of the buoy vertical shaft is communicated to the brine pond.
By utilizing the drop of the brine ponds at the upstream and downstream, brine acts on the circular continuous flashboard to rotate through the U-shaped water trough, the lock pin is linked to open and close the lock pin, the lock pin is linked to pull open or reset by a float, the float stroke is set according to the water level of the brine pond at the downstream, the upper limit is set to be full of water and close the lock, and the lower limit is set to be lack of water and open the lock, so that the automatic brine supply and discharge by evaporation is realized.
Claims (5)
1. Automatic device of discharging of giving of salt brine, its characterized in that: the water passing device comprises a U-shaped water passing groove arranged on a low bank between an upstream water passing pond and a downstream water passing pond, wherein the U-shaped water passing groove is provided with a hinged rotating shaft, a lower cross beam is arranged below the U-shaped water passing groove, a circular continuous flashboard is arranged on the rotating shaft, three flashboards are uniformly arranged on the circular continuous flashboard along the axial direction, a switch lock pin rotating disc is arranged on one side of the circular continuous flashboard, three positioning grooves are uniformly arranged on the switch lock pin rotating disc, and a switch lock pin and a water passing positioning lock pin are arranged at the positioning grooves; one side of the U-shaped water passing groove is provided with a buoy with a counterweight, and the buoy is respectively connected with the switch brake lock pin and the water passing positioning lock pin through a guy cable wire;
the opening of the switch lock pin and the opening of the water passing positioning lock pin are uniformly distributed on the periphery of the switch lock pin rotating disc, and an included angle is 120 degrees; the initial sealing position of the first flashboard has an included angle of 30 degrees with the lead weight direction, the circular continuous flashboard rotates for 30 degrees, and the water-feeding positioning lock pin falls into the positioning groove; the circular continuous flashboard rotates 90 degrees again, and the switch brake lock pin returns to a positioning groove;
when the water level of the downstream evaporation pond drops due to the required water level, the buoys with the counterweights pull the pull rope wires, the pull rope wires pull the switch gate lock pins, the switch gate lock pins are under the action of upstream water pressure, the first gate plates of the circular continuous gate plates are pushed open, the switch gate lock pins rotate for 30 degrees, the water passing positioning lock pins fall into the positioning grooves, brine flows into the downstream evaporation pond through the upper part of the lower cross beam, and meanwhile, the second gate plates of the circular continuous gate plates are controlled by the water passing positioning lock pins; when water is injected to a set water level, the buoy pulls the inhaul cable line to pull the switch gate positioning lock pin, the circular continuous flashboard rotates 90 degrees, the switch gate lock pin returns to the positioning groove, the gate is closed, the flashboard and the lower cross beam are positioned on the same axis, the water pressure expansion sealing strip is subjected to water injection expansion of the transverse sealing strip under the action that the upstream water pressure is larger than the downstream water pressure, the transverse sealing strip is tightly attached to the lower part of the flashboard, and when the water is evaporated to the lower limit again, the second flashboard of the circular continuous flashboard is opened again, so that the repeated automatic brine supply and discharge function is formed.
2. The automatic salt brine feeding and discharging device according to claim 1, wherein: and a hydraulic expansion sealing strip is arranged between the circular continuous flashboard and the lower cross beam.
3. The automatic salt brine feeding and discharging device according to claim 1, wherein: the opening of the switch lock pin and the opening of the water passing positioning lock pin are uniformly distributed on the periphery of the switch lock pin rotating disc, and an included angle is 120 degrees; the initial sealing position of the first flashboard has an included angle of 30 degrees with the lead weight direction, the circular continuous flashboard rotates for 30 degrees, and the water-passing positioning lock pin falls into the positioning groove; the circular continuous flashboard rotates 90 degrees again, and the switch brake lock pin returns to the positioning groove.
4. The automatic salt brine feeding and discharging device according to claim 1, wherein: sundry interception grate is arranged in the water facing direction of the U-shaped water passing groove.
5. The automatic salt brine feeding and discharging device according to claim 1, wherein: and a water stop sealing strip is arranged between the U-shaped water passing groove and the gap of the circular continuous flashboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910404315.5A CN110171836B (en) | 2019-05-14 | 2019-05-14 | Automatic feeding and discharging device for salt-making brine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910404315.5A CN110171836B (en) | 2019-05-14 | 2019-05-14 | Automatic feeding and discharging device for salt-making brine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110171836A CN110171836A (en) | 2019-08-27 |
| CN110171836B true CN110171836B (en) | 2024-03-19 |
Family
ID=67691101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910404315.5A Active CN110171836B (en) | 2019-05-14 | 2019-05-14 | Automatic feeding and discharging device for salt-making brine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110171836B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2430479Y (en) * | 2000-07-05 | 2001-05-16 | 胡建新 | Water saving double row downward water outlet |
| JP2002285533A (en) * | 2001-03-26 | 2002-10-03 | Marsima Aqua System Corp | Non-power type gate |
| CN201362843Y (en) * | 2009-01-17 | 2009-12-16 | 金贤世 | Automatic water supplying gate for locating paddy fields |
| CN104488668A (en) * | 2014-12-16 | 2015-04-08 | 杨立军 | Buoyancy switch and automatic paddy field irrigation mechanism comprising buoyancy switch |
| CN106544989A (en) * | 2016-12-09 | 2017-03-29 | 能诚集团有限公司 | A kind of water level automatically controls lock |
| CN206625195U (en) * | 2017-04-06 | 2017-11-10 | 东北农业大学 | A kind of streamlined rotary hydraulic gate |
| CN108468310A (en) * | 2017-09-28 | 2018-08-31 | 贺健元 | Barrage turnstile door automatic switch |
| CN109113169A (en) * | 2018-10-23 | 2019-01-01 | 刘长江 | Drainage pipeline automatic flushing device |
| CN210457497U (en) * | 2019-05-14 | 2020-05-05 | 唐山三友盐化有限公司 | Automatic feeding and discharging device for salt-making brine |
-
2019
- 2019-05-14 CN CN201910404315.5A patent/CN110171836B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2430479Y (en) * | 2000-07-05 | 2001-05-16 | 胡建新 | Water saving double row downward water outlet |
| JP2002285533A (en) * | 2001-03-26 | 2002-10-03 | Marsima Aqua System Corp | Non-power type gate |
| CN201362843Y (en) * | 2009-01-17 | 2009-12-16 | 金贤世 | Automatic water supplying gate for locating paddy fields |
| CN104488668A (en) * | 2014-12-16 | 2015-04-08 | 杨立军 | Buoyancy switch and automatic paddy field irrigation mechanism comprising buoyancy switch |
| CN106544989A (en) * | 2016-12-09 | 2017-03-29 | 能诚集团有限公司 | A kind of water level automatically controls lock |
| CN206625195U (en) * | 2017-04-06 | 2017-11-10 | 东北农业大学 | A kind of streamlined rotary hydraulic gate |
| CN108468310A (en) * | 2017-09-28 | 2018-08-31 | 贺健元 | Barrage turnstile door automatic switch |
| CN109113169A (en) * | 2018-10-23 | 2019-01-01 | 刘长江 | Drainage pipeline automatic flushing device |
| CN210457497U (en) * | 2019-05-14 | 2020-05-05 | 唐山三友盐化有限公司 | Automatic feeding and discharging device for salt-making brine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110171836A (en) | 2019-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1029131B1 (en) | Fishway system | |
| EP2464858B1 (en) | Shaft power plant | |
| EP2499353B1 (en) | Shaft power plant | |
| CN103798102A (en) | Wind-powered drip irrigation water supplying equipment | |
| RU2601040C1 (en) | Water intake structure for intake of water from surface sources | |
| CN110171836B (en) | Automatic feeding and discharging device for salt-making brine | |
| CN113622381B (en) | Floating-pushing water outlet device for gate of small and medium-sized water conservancy spillway | |
| CN210457497U (en) | Automatic feeding and discharging device for salt-making brine | |
| US20200024814A1 (en) | Fish lift and descent device for save the obstacles in the rivers, generating electrical energy | |
| KR200349016Y1 (en) | The little water-power generating equipment which applies the surplus water level of irrigation channel | |
| WO2008004202A2 (en) | System for preventing overflows | |
| DE102013020984A1 (en) | Steel hollow body systems as a pumped storage plant | |
| KR102260285B1 (en) | Small hydro power generator for efficient use of influent and discharged water | |
| DE102014002691A1 (en) | Steel hollow body systems as pumped storage tank improvements | |
| WO1987005078A1 (en) | Device for exploiting the wave energy of surface water and a wave power station which contains at least one such device | |
| CN109258047B (en) | Agricultural water-power wave water-fertilizer irrigation system | |
| DE202011100466U1 (en) | Pumped Storage Power Plant System | |
| CN208266787U (en) | A kind of reservoir automatic draining dredging structure | |
| CN105113464A (en) | Rubber dam self-collapsing protecting method and device and device using method | |
| CN204959696U (en) | Rubber dam is from protection device that bursts | |
| KR101061213B1 (en) | The method of using buoyancy hydropower agencies and the system of same | |
| DE102004025769A1 (en) | Mechanism for river infrastructure modernization has partition wall and sluice gates which open when water level in river rises above danger level to supply excess water to hydro-electric power plant through pipeline | |
| RU2529764C2 (en) | Pumped storage plant (psp) and riverbed water wheel of hydraulic power unit | |
| SU1493750A2 (en) | Spillway tunnel of high-head hydraulic power station | |
| CN117678363B (en) | Test device for saline-alkali soil used for halophyte improvement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ji Tianlong Inventor after: E Jianjun Inventor after: Zhang Xu Inventor after: Gao Yu Inventor after: Guo Fuxiong Inventor after: Zhang Jianmin Inventor after: Ma Haiyong Inventor after: Zhang Guiqiang Inventor after: Bi Ligang Inventor after: Zhang Qinglong Inventor after: An Yanping Inventor after: Wu Yutao Inventor after: Wang Xinrong Inventor before: Ji Tianlong Inventor before: E Jianjun Inventor before: Zhang Xu Inventor before: Gao Yu Inventor before: Guo Fuxiong Inventor before: Zhang Jianmin Inventor before: Ma Haiyong Inventor before: Zhang Guiqiang Inventor before: Bi Ligang Inventor before: Zhang Qinglong Inventor before: An Yanping Inventor before: Wu Yutao Inventor before: Wang Xinrong |