CN213295088U - Mariculture sewage treatment system convenient to retrieve - Google Patents
Mariculture sewage treatment system convenient to retrieve Download PDFInfo
- Publication number
- CN213295088U CN213295088U CN202021485565.0U CN202021485565U CN213295088U CN 213295088 U CN213295088 U CN 213295088U CN 202021485565 U CN202021485565 U CN 202021485565U CN 213295088 U CN213295088 U CN 213295088U
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- sewage treatment
- tank
- contact oxidation
- biological filter
- screw
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- 239000010865 sewage Substances 0.000 title claims abstract description 73
- 238000009364 mariculture Methods 0.000 title claims abstract description 20
- 230000003647 oxidation Effects 0.000 claims abstract description 29
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000011010 flushing procedure Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000005189 flocculation Methods 0.000 claims description 14
- 230000016615 flocculation Effects 0.000 claims description 14
- 238000004062 sedimentation Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000011001 backwashing Methods 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 8
- 239000002351 wastewater Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 210000003437 trachea Anatomy 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 239000004599 antimicrobial Substances 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000003640 drug residue Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The utility model discloses a mariculture sewage treatment system convenient for recovery, which comprises a sewage treatment box, wherein one side of the top end of the sewage treatment box is provided with an adjusting tank, the top end of the sewage treatment box is provided with a first contact oxidation tank near the adjusting tank, the middle part of the top end of the sewage treatment box is provided with a denitrification biological filter, the middle part of the top end of the sewage treatment box is provided with a second contact oxidation tank near the denitrification biological filter, the bottom end of the inner wall of the denitrification biological filter is provided with a rectangular support frame near a backwashing air pipe, a fixing screw rod can be fixed through a first fixing nut and a second fixing nut, the backwashing air pipe can be supported through the rectangular support frame, the fixing screw rod and a fixing fixture block, the backwashing air pipe can be fixed through a limiting fixture block, a fixing screw hole, a sealing clamp groove and a sealing clamp plate, and the installation difficulty of the backwashing air, the use of the back flushing air pipe by the working personnel is convenient.
Description
Technical Field
The utility model relates to a sewage treatment technical field specifically is a mariculture sewage treatment system convenient to retrieve.
Background
In the 21 st century, with the rapid development of the mariculture industry in China, the discharge amount of wastewater from coastal nursery and breeding farms is increasing day by day, the environment of offshore waters is seriously deteriorated, thereby causing the unbalance of the ecosystem of the offshore area, the frequent red tide and the breeding of diseases, the mariculture waste water comprises granular solid waste derived from excrement and feed, dissolved metabolic waste, dissolved nutrient salt, antimicrobial agent, drug residue and the like, so when the waste water is discharged in large quantity, the method can cause eutrophication or water quality deterioration of aquaculture water and adjacent water areas, in order to prevent and control the water quality pollution of the mariculture wastewater to the water areas and ensure the normal growth and reproduction of fishes, shellfishes and algae and the quality of aquatic products, the Ministry of agriculture of China issued the requirements for discharging the mariculture water (SC/T9103-2007) in 2007 and started to implement from 9 months and 1 days in the year, and the discharge of the mariculture wastewater into the sea after being treated becomes the inevitable trend of the development of the mariculture industry;
in the existing seawater treatment process, a denitrification biological filter is used, a back-flushing air pipe is arranged at the bottom of the denitrification biological filter, but when the existing back-flushing air pipe is used, the connection is easy to loosen due to the impact of water flow, and the use of the back-flushing air pipe is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a mariculture sewage treatment system convenient to retrieve can effectively solve the current sea water treatment in-process that proposes in the above-mentioned background art, can use the denitrification biological filter, at denitrification biological filter bottom of the pool, can install the recoil gas washing pipe, but current recoil gas washing pipe is when using, because of the impact of rivers, appears connecting not hard up phenomenon easily, can influence the problem of recoil gas washing pipe's use.
In order to achieve the above object, the utility model provides a following technical scheme: a mariculture sewage treatment system convenient to recover comprises a sewage treatment box, wherein a regulating reservoir is arranged on one side of the top end of the sewage treatment box, a first contact oxidation pond is arranged at the position, close to the regulating reservoir, of the top end of the sewage treatment box, a denitrification biological filter is arranged in the middle of the top end of the sewage treatment box, a second contact oxidation pond is arranged at the position, close to the denitrification biological filter, of the middle of the top end of the sewage treatment box, aeration pipes are respectively arranged at the bottom of one end of the inner wall of the first contact oxidation pond and the bottom of one end of the inner wall of the second contact oxidation pond, back flushing air pipes are equidistantly arranged at one end of the inner wall of the denitrification biological filter, a rectangular support frame is arranged at the position, close to the back flushing air pipes, positioning holes are equidistantly arranged on two sides of the top end of the rectangular support frame, second fixation nut is installed at fixation screw surface top, the welding of fixation screw top middle part has fixed fixture block, spacing hole has all been seted up to fixed fixture block top both sides limit portion, spacing screw has been seted up at spacing downthehole wall one end middle part, spacing downthehole internally mounted has spacing cardboard, spacing screw internally mounted has spacing screw, the welding of four terminal surface bottoms of rectangle support frame has spacing fixture block, fixed screw has been seted up at spacing fixture block top middle part.
Preferably, the flocculation and precipitation pond has been seted up to sewage treatment case top opposite side, the sewage treatment case top is close to flocculation and precipitation pond department and has seted up the clean water basin, sewage treatment case top both sides limit portion is close to denitrification biological filter department and has seted up sealed draw-in groove, sealed draw-in groove internally mounted has sealed cardboard, equal apart from the welding in sewage treatment case both sides top has Contraband type fixture block, Contraband type fixture block internally mounted has L type cardboard, extrusion screw is installed to L type cardboard top one side limit portion.
Preferably, connecting pipes are arranged between the regulating tank and the first contact oxidation tank, between the first contact oxidation tank and the denitrification biological filter, between the denitrification biological filter and the second contact oxidation tank, between the second contact oxidation tank and the flocculation sedimentation tank, and between the flocculation sedimentation tank and the clean water tank.
Preferably, the diameter of the positioning hole is larger than the inner diameter of the fixing screw, and the width of the cross section of the first fixing nut and the width of the cross section of the second fixing nut are both larger than the diameter of the positioning hole.
Preferably, the edge part of the bottom end of the sealing clamping plate is bonded with a rubber sealing gasket, and the rubber sealing gasket is positioned inside the sealing clamping groove.
Preferably, sewage treatment case top one side is close to the equalizing basin and installs the microstrainer, the input of microstrainer and the output electric connection of commercial power, microstrainer surface one side is connected with the inlet tube, the flow pipe is installed to microstrainer surface opposite side, flow pipe one end is connected with the equalizing basin, L type fixed plate is all installed to equalizing basin top four corners department, multistage telescopic cylinder is installed to L type fixed plate top one side, the filter screen is installed to multistage telescopic cylinder push rod end.
Compared with the prior art, the beneficial effects of the utility model are that:
1. through first fixation nut and second fixation nut, can fix fixation screw, through rectangle support frame, fixation screw and fixed fixture block, can support the back flush trachea, through spacing fixture block, fixed screw, sealed draw-in groove and sealed cardboard, can fix the back flush trachea, can reduce the installation degree of difficulty of back flush trachea, the staff of being convenient for is to the use of back flush trachea.
2. Through the cooperation use of sealed draw-in groove and sealed cardboard, can seal the denitrification biological filter, through Contraband type fixture block, L type cardboard and extrusion screw, can fix sealed cardboard, can make the connection of sealed draw-in groove and sealed cardboard inseparabler, the inside biological reaction's of denitrification biological filter of being convenient for goes on.
3. Through the microstrainer, can carry out the initial gross separation to the impurity in the sewage, carry out the initial gross filtration to sewage, through the filter screen, can carry out secondary filtration to sewage, through twice filtration, can reduce the impurity in the sewage, the staff of being convenient for is to the subsequent processing of sewage, through using, the staff can clear up the impurity of filter screen inside, is favorable to reducing staff's the clearance degree of difficulty.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic view of the structure of the sealing slot of the present invention;
fig. 3 is a cross-sectional view of the present invention;
FIG. 4 is a schematic view of the positioning hole of the present invention;
fig. 5 is a schematic view of an installation structure of a second fixing nut of the present invention;
reference numbers in the figures: 1. a sewage treatment tank; 2. a regulating tank; 3. a first contact oxidation pond; 4. a denitrification biological filter; 5. a second contact oxidation pond; 6. a flocculation sedimentation tank; 7. a clean water tank; 8. an aeration pipe; 9. back flushing the air pipe; 10. a rectangular support frame; 11. positioning holes; 12. fixing the screw rod; 13. a first fixing nut; 14. a second fixing nut; 15. fixing the fixture block; 16. a limiting hole; 17. a limiting screw hole; 18. a limiting clamping plate; 19. a limit screw; 20. a limiting clamping block; 21. fixing screw holes; 22. sealing the clamping groove; 23. a sealing clamping plate; 24. model Contraband latch; 25. an L-shaped clamping plate; 26. extruding the screw; 27. an L-shaped fixing plate; 28. a multi-stage telescopic cylinder; 29. a filter screen; 30. a micro-filter; 31. a water inlet pipe; 32. and a water supply pipe.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Example (b): as shown in figures 1-5, the utility model provides a technical scheme, a mariculture sewage treatment system convenient for recovery, which comprises a sewage treatment box 1, an adjusting tank 2 is arranged at one side of the top end of the sewage treatment box 1, a first contact oxidation tank 3 is arranged at the top end of the sewage treatment box 1 near the adjusting tank 2, a denitrification biological filter 4 is arranged at the middle part of the top end of the sewage treatment box 1, a second contact oxidation tank 5 is arranged at the middle part of the top end of the sewage treatment box 1 near the denitrification biological filter 4, aeration pipes 8 are respectively arranged at the bottom of one end of the inner wall of the first contact oxidation tank 3 and the bottom of one end of the inner wall of the second contact oxidation tank 5, back flushing pipes 9 are arranged at equal intervals at one end of the inner wall of the denitrification biological filter 4, a rectangular support frame 10 is arranged at the bottom of the inner wall of the denitrification biological filter 4, locating hole 11 internally mounted has set screw 12, the diameter of locating hole 11 is greater than set screw 12's internal diameter, the width of first set nut 13 cross section and the width of second set nut 14 cross section all are greater than locating hole 11's diameter, the staff of being convenient for is to fixed fixture block 15's use, first set nut 13 is installed to 12 outer surface bottoms of set screw, second set nut 14 is installed at 12 outer surface tops of set screw, 12 top middle welding of set screw have fixed fixture block 15, fixed fixture block 15 top both sides limit hole 16 has all been seted up to limit hole 15, spacing screw 17 has been seted up at spacing 16 inner wall one end middle part, spacing 16 internally mounted has spacing cardboard 18, spacing screw 17 internally mounted has spacing screw 19, all welding has spacing fixture block 20 bottom the four terminal surfaces of rectangular support frame 10, spacing fixture block 20 top middle part has seted up fixed screw.
The flocculation sedimentation tank 6 is arranged on the other side of the top end of the sewage treatment tank 1, the clean water tank 7 is arranged on the top end of the sewage treatment tank 1 close to the flocculation sedimentation tank 6, the sealing clamping groove 22 is arranged on the two side edges of the top end of the sewage treatment tank 1 close to the denitrification biological filter 4, the sealing clamping groove 22 is internally provided with the sealing clamping plate 23, the bottom edge of the sealing clamping plate 23 is bonded with the rubber sealing gasket, the rubber sealing gasket is positioned inside the sealing clamping groove 22, the sealing performance of the sealing clamping plate 23 can be improved, the denitrification reaction inside the denitrification biological filter 4 is convenient, Contraband-type clamping blocks 24 are welded on the tops of the two sides of the sewage treatment tank 1 at equal intervals, an L-type clamping plate 25 is arranged inside the Contraband-type clamping block 24, an extrusion screw 26 is arranged on one side edge of the top end of the L-type clamping plate 25, an adjusting tank 2 and a first contact oxidation tank 3, Connecting pipes are arranged between the second contact oxidation tank 5 and the flocculation sedimentation tank 6 and between the flocculation sedimentation tank 6 and the clean water tank 7, so that the sewage treatment tank 1 can treat sewage conveniently.
1 top one side of sewage treatment case is close to equalizing basin 2 and installs microstrainer 30, the microstrainer 30 model is TXWL1-TXWL8, the input of microstrainer 30 and the output electric connection of commercial power, microstrainer 30 surface one side is connected with inlet tube 31, water supply pipe 32 is installed to microstrainer 30 surface opposite side, water supply pipe 32 one end is connected with equalizing basin 2, L type fixed plate 27 is all installed to 2 top four corners departments of equalizing basin, multistage telescopic cylinder 28 is installed to L type fixed plate 27 top one side, filter screen 29 is installed to multistage telescopic cylinder 28 push rod end.
The utility model discloses a theory of operation and use flow: a mariculture sewage treatment system convenient to retrieve, in the actual use process, a worker starts a micro-filter 30 and connects a water inlet pipe 31 with culture sewage, the sewage reaches a water supply pipe 32 through the micro-filter 30 and reaches an adjusting tank 2 from the water supply pipe 32, under the action of gravity, the sewage passes through a filter screen 29 to reach the bottom of the adjusting tank 2, then the sewage enters a first contact oxidation tank 3 through a connecting pipe, the micro-filter 30 can preliminarily separate impurities in the sewage, the sewage is preliminarily filtered, the sewage can be filtered again through the filter screen 29, the impurities in the sewage can be reduced through twice filtering, the subsequent treatment of the sewage by the worker is convenient, when the impurities in the filter screen 29 are accumulated to a certain amount, the worker starts a multi-stage telescopic cylinder 28, the multi-stage telescopic cylinder 28 works to drive the impurities in the filter screen 29 to move upwards, the difficulty of cleaning impurities by workers is reduced;
the sewage passes through the first contact oxidation tank 3 and is aerated, the aerated sewage enters the denitrification biological filter 4, the sewage can be denitrified through biological reaction in the denitrification biological filter 4, the denitrified sewage enters the second contact oxidation tank 5 and is aerated again, the sewage enters the flocculation sedimentation tank 6 for sedimentation, and the settled sewage is discharged into the clean water tank 7;
when sludge in the denitrification biological filter 4 is cleaned, the backwashing gas pipe 9 needs to be used, when the backwashing gas pipe 9 is installed, a worker installs the rectangular support frame 10 at the bottom end of the backwashing gas pipe 9, installs the expansion screw in the fixing screw hole 21 to fix the rectangular support frame 10, then installs the fixing screw 12 in the positioning hole 11, adjusts the position of the fixing screw 12, then installs the first fixing nut 13 and the second fixing nut 14 to fix the fixing screw 12, the fixing screw 12 can be fixed by matching the first fixing nut 13 and the second fixing nut 14, meanwhile, the difficulty of height adjustment of the fixing screw 12 can be reduced, and by adjusting the height of the fixing screw 12, the worker puts the backwashing gas pipe 9 into the fixing fixture block 15, then, a worker installs a limiting clamping plate 18 in the limiting hole 16, rotates a limiting screw 19 to fix the limiting clamping plate 18, and can limit the backwashing air pipe 9 by fixing the limiting clamping plate 18, so that the worker can install and use the backwashing air pipe 9 conveniently;
use through the cooperation of sealed draw-in groove 22 and sealed cardboard 23, can seal up denitrification biological filter 4, the inside biological reaction of denitrification biological filter 4 of being convenient for goes on, through Contraband type fixture block 24, L type cardboard 25 and extrusion screw 26, can fix sealed cardboard 23, can make sealed draw-in groove 22 and sealed cardboard 23 be connected inseparabler, the use of denitrification biological filter 4 of being convenient for.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a mariculture sewage treatment system convenient to retrieve, includes sewage treatment case (1), its characterized in that: the device is characterized in that a regulating reservoir (2) is arranged on one side of the top end of a sewage treatment tank (1), a first contact oxidation pond (3) is arranged at the position, close to the regulating reservoir (2), of the top end of the sewage treatment tank (1), a denitrification biological filter (4) is arranged in the middle of the top end of the sewage treatment tank (1), a second contact oxidation pond (5) is arranged at the position, close to the denitrification biological filter (4), of the middle of the top end of the sewage treatment tank (1), aeration pipes (8) are respectively arranged at the bottom of one end of the inner wall of the first contact oxidation pond (3) and the bottom of one end of the inner wall of the second contact oxidation pond (5), back flushing pipes (9) are respectively arranged at equal intervals at one end of the inner wall of the denitrification biological filter (4), a rectangular support frame (10) is arranged at the position, close to the back flushing pipes (9), positioning holes (, locating hole (11) internally mounted has set screw (12), set screw (12) surface bottom installs first fixation nut (13), second fixation nut (14) are installed at set screw (12) surface top, set screw (12) top middle welding has fixed fixture block (15), spacing hole (16) have all been seted up to fixed fixture block (15) top both sides limit portion, spacing screw (17) have been seted up at spacing hole (16) inner wall one end middle part, spacing hole (16) internally mounted has spacing cardboard (18), spacing screw (17) internally mounted has stop screw (19), four terminal surface bottoms of rectangle support frame (10) have all welded spacing fixture block (20), fixed screw (21) have been seted up at spacing fixture block (20) top middle part.
2. The easy-to-recover mariculture sewage treatment system according to claim 1, wherein: flocculation and precipitation pond (6) have been seted up to sewage treatment case (1) top opposite side, sewage treatment case (1) top is close to flocculation and precipitation pond (6) department and has seted up clean water basin (7), sewage treatment case (1) top both sides limit portion is close to denitrification biological filter (4) department and has seted up sealed draw-in groove (22), sealed draw-in groove (22) internally mounted has sealed cardboard (23), the equal equidistance welding in sewage treatment case (1) both sides top has Contraband type fixture block (24), Contraband type fixture block (24) internally mounted has L type cardboard (25), extrusion screw rod (26) are installed to one side limit portion in L type cardboard (25) top.
3. The easy-to-recover mariculture sewage treatment system according to claim 2, wherein: connecting pipes are arranged between the adjusting tank (2) and the first contact oxidation tank (3), between the first contact oxidation tank (3) and the denitrification biological filter (4), between the denitrification biological filter (4) and the second contact oxidation tank (5), between the second contact oxidation tank (5) and the flocculation sedimentation tank (6) and between the flocculation sedimentation tank (6) and the clean water tank (7).
4. The easy-to-recover mariculture sewage treatment system according to claim 1, wherein: the diameter of the positioning hole (11) is larger than the inner diameter of the fixing screw rod (12), and the width of the cross section of the first fixing nut (13) and the width of the cross section of the second fixing nut (14) are both larger than the diameter of the positioning hole (11).
5. The easy-to-recover mariculture sewage treatment system according to claim 2, wherein: the edge of the bottom end of the sealing clamping plate (23) is bonded with a rubber sealing gasket, and the rubber sealing gasket is positioned inside the sealing clamping groove (22).
6. The easy-to-recover mariculture sewage treatment system according to claim 1, wherein: sewage treatment case (1) top one side is close to equalizing basin (2) and installs microstrainer (30), the input of microstrainer (30) and the output electric connection of commercial power, microstrainer (30) surface one side is connected with inlet tube (31), water pipe (32) are installed to microstrainer (30) surface opposite side, water pipe (32) one end is connected with equalizing basin (2), L type fixed plate (27) are all installed to equalizing basin (2) top four corners department, multistage telescopic cylinder (28) are installed to L type fixed plate (27) top one side, filter screen (29) are installed to multistage telescopic cylinder (28) push rod end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021485565.0U CN213295088U (en) | 2020-07-24 | 2020-07-24 | Mariculture sewage treatment system convenient to retrieve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021485565.0U CN213295088U (en) | 2020-07-24 | 2020-07-24 | Mariculture sewage treatment system convenient to retrieve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213295088U true CN213295088U (en) | 2021-05-28 |
Family
ID=76021612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021485565.0U Active CN213295088U (en) | 2020-07-24 | 2020-07-24 | Mariculture sewage treatment system convenient to retrieve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213295088U (en) |
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2020
- 2020-07-24 CN CN202021485565.0U patent/CN213295088U/en active Active
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Effective date of registration: 20231113 Address after: 516300 Pinghai Town Bijia Xiaoao, Huidong County, Huizhou City, Guangdong Province Patentee after: Guangdong Zeng Tenghui Marine Technology Co.,Ltd. Address before: 261200 No. 171, Wangjiatun village, Jiulong sub district office, Fangzi District, Weifang City, Shandong Province Patentee before: Wang Yifu |