CN111997124A - Power station silt cleaning device - Google Patents
Power station silt cleaning device Download PDFInfo
- Publication number
- CN111997124A CN111997124A CN202010923178.9A CN202010923178A CN111997124A CN 111997124 A CN111997124 A CN 111997124A CN 202010923178 A CN202010923178 A CN 202010923178A CN 111997124 A CN111997124 A CN 111997124A
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- China
- Prior art keywords
- shell
- face
- rotating shaft
- motorboat
- inner cavity
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- 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.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/8833—Floating installations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/92—Digging elements, e.g. suction heads
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a power station sludge cleaning device, which comprises a motorboat, wherein two sludge conveying devices are symmetrically arranged at the left end and the right end of the motorboat serving as a symmetrical center, each sludge conveying device comprises a sensor fixedly connected with the motorboat, one end of the sensor far away from the motorboat is fixedly provided with a first shell, a first inner cavity is arranged in the first shell, the inner wall of the upper side of the first inner cavity is fixedly provided with a sliding groove, a sliding rod is arranged in the sliding groove in a sliding manner, the lower side of the sliding rod is provided with a buoyancy block, the buoyancy block is arranged in the sliding groove in a sliding manner, the lower end surface of the first shell is fixedly provided with a magnet, and the lower side of the magnet is provided with an electromagnet. And can intensively treat the silt and the fine sand on the water surface.
Description
Technical Field
The invention relates to the field of hydroelectric power generation equipment, in particular to a power station sludge cleaning device.
Background
Hydroelectric power generation, and scientific technology for researching technical and economic problems of engineering construction, production, operation and the like for converting water energy into electric energy. The water energy utilized by hydroelectric power generation is mainly potential energy stored in water. In order to convert water energy into electric energy, different types of hydropower stations need to be built. The hydroelectric generation is that the potential energy contained in rivers, lakes and the like which are positioned at high positions and have potential energy is converted into the kinetic energy of a water turbine by utilizing the water turbine as motive power to drive a generator to generate electric energy. The generator is easy to be broken down by the flowing sand and silt in the water during the working process.
Disclosure of Invention
The invention aims to provide a power station sludge cleaning device, which overcomes the defect that a hydroelectric generator is paralyzed due to the entering of quicksand and sludge in the working process of the hydroelectric generator.
The invention is realized by the following technical scheme.
The invention discloses a power station sludge cleaning device, which comprises a motorboat, wherein two sludge conveying devices are symmetrically arranged at the left end and the right end of the motorboat as a symmetrical center, each sludge conveying device comprises a sensor fixedly connected with the motorboat, one end of the sensor far away from the motorboat is fixedly provided with a first shell, a first inner cavity is arranged in the first shell, the inner wall of the upper side of the first inner cavity is fixedly provided with a sliding groove, a sliding rod is arranged in the sliding groove in a sliding manner, the lower side of the sliding rod is provided with a buoyancy block, the buoyancy block is arranged in the sliding groove in a sliding manner, the lower end surface of the first shell is fixedly provided with a magnet, the lower side of the magnet is provided with an electromagnet, the two electromagnets are fixedly connected with a second shell, the second shell is internally provided with a second inner cavity, the inner wall of the lower side of the second inner cavity, a trigger rod is arranged on the upper side of the reset button, one end, close to the motorboat, of the trigger rod is fixedly connected to the right end face of the pressure block, two first springs are fixedly arranged on the lower end face of the pressure block, the first springs are fixed on the upper end face of the third shell, the pressure block moves downwards under the pressure from the given pressure to compress the first springs, the trigger rod triggers the reset button downwards to disconnect the power supply, the electromagnet is disconnected from the magnet, and the motorboat rises according to the buoyancy of the motorboat; a supporting block is fixedly arranged on the left end face of the third shell, a sludge storage device is arranged on the upper side of the supporting block and comprises a first box, a first baffle is arranged on the lower side of the first box, the right end of the first baffle is rotatably connected with a fourth shell through a first torsion spring, a fixed block is arranged on the lower side of the first torsion spring and is fixedly arranged in the fourth shell, a spring groove with an opening facing to the left is arranged in the fixed block, a second spring is fixedly arranged on the inner wall of the right side of the spring groove, a piston which is slidably connected with the spring groove is fixedly arranged on the left end face of the second spring, a sliding rod is fixedly arranged on the left end face of the piston, a first thin rope is fixedly arranged on the right end face of the sliding rod, the first thin rope is wound on a first wire wheel, the other end of the first thin rope is fixedly arranged on the lower end face of the second baffle, a second box is arranged on the upper side of the second baffle, the rotation of the first baffle can drive the second baffle to rotate, the second box freely falls onto the first baffle, and the first box slides onto the motorboat through the supporting block; the sludge collecting device comprises a first belt pulley fixedly arranged on the first rotating shaft, a first belt is rotatably arranged on the first belt pulley, the first belt is rotatably connected with a second belt pulley, a third inner cavity is arranged in the fifth shell, a first shaft sleeve is fixedly arranged on the inner wall of the lower side of the third inner cavity, a second rotating shaft is rotatably arranged in the first shaft sleeve, the second belt pulley is fixedly arranged on the second rotating shaft, a spiral blade is fixedly arranged on the second rotating shaft, and a sixth shell is fixedly arranged on the fifth shell, a fourth inner cavity is formed in the sixth shell, the upper side of the fourth inner cavity is communicated with a material conveying port, a material feeding pipe is connected to the front and the rear of the sixth shell respectively, a filtering port is fixedly formed in the lower end face of the material feeding pipe, the first motor rotates the first belt pulley through the first rotating shaft, and the first belt pulley rotates the second rotating shaft through the first belt to clean sludge; the upper side of the sludge collecting device is provided with a centrifugal sand removing device which comprises the first rotating shaft, the first rotating shaft penetrates through the seventh shell to be fixedly connected with the third belt pulley, a second belt is rotatably arranged on the third belt pulley and connected with the second belt pulley, a fifth inner cavity is arranged in the seventh shell, two second shaft sleeves are symmetrically arranged in front and back by taking the first rotating shaft as a symmetric center and fixed on the inner wall of the lower side of the fifth inner cavity, three second belt pulleys are respectively provided with a third rotating shaft in a rotating way, the third rotating shaft is fixedly provided with a blade, the front part and the rear part of the blade are fixedly provided with two sieve pores, the front part and the rear part of each sieve pore are provided with two fine sand inflow cavities, the fine sand flows into chamber downside intercommunication second material transmission mouth, the blade passes through the rotation of third pivot is according to centrifugal force with aquatic fine sand flow in the sieve is downthehole.
Preferably, silt conveyor is still including setting up sixth inner chamber in the third shell, the fixed receiver that is equipped with of sixth inner chamber rear side inner wall, the fixed second motor that is equipped with of receiver left end face, the torsion shaft is connected in the rotation of second motor left end face, the fixed second reel that is equipped with on the torsion shaft, it has the second string to wind in the second reel, the second string runs through the third shell with pressure piece with terminal surface fixed connection under the motor boat.
The invention has the beneficial effects that: the invention can remove silt and fine sand doped in water flow near the water outlet of the power station, prevent the generator from being paralyzed due to the entering of the quicksand and the silt in the working process of the hydroelectric generator, and can intensively treat the silt and the fine sand on the water surface.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a left side cross-sectional view of the embodiment of the present invention FIG. 1;
FIG. 3 is an enlarged schematic view of the embodiment of the present invention at A in FIG. 1;
FIG. 4 is an enlarged schematic view of the embodiment of the present invention at B in FIG. 1;
FIG. 5 is an enlarged schematic view of the embodiment of the present invention at C in FIG. 1.
Detailed Description
The invention will now be described in detail with reference to fig. 1-5, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.
The power station sludge cleaning device described in conjunction with fig. 1-5 comprises a motorboat 45, two sludge conveying devices 100 are symmetrically arranged at the left end and the right end of the motorboat 45, the two sludge conveying devices 100 comprise a sensor 76 fixedly connected with the motorboat 45, one end of the sensor 76 far away from the motorboat 45 is fixedly provided with a first housing 77, a first inner cavity 78 is arranged in the first housing 77, the inner wall of the upper side of the first inner cavity 78 is fixedly provided with a sliding groove 79, a sliding rod 80 is arranged in the sliding groove 79 in a sliding manner, the lower side of the sliding rod 80 is provided with a buoyancy block 81, the buoyancy block 81 is arranged in the sliding groove 79 in a sliding manner, the lower end surface of the first housing 77 is fixedly provided with a magnet 82, the lower side of the magnet 82 is provided with an electromagnet 46, a second housing 48 is fixedly connected between the two electromagnets 46, and a second inner cavity 83 is arranged, two power supplies 49 are symmetrically and fixedly arranged on the left and right of the inner wall of the lower side of the second inner cavity 83, a reset button 50 is fixedly arranged on the upper end face of each power supply 49, a trigger rod 51 is arranged on the upper side of each reset button 50, one end, close to the motorboat 45, of each trigger rod 51 is fixedly connected to the right end face of a pressure block 72, two first springs 74 are fixedly arranged on the lower end face of each pressure block 72, each first spring 74 is fixed on the upper end face of a third shell 47, each pressure block 72 is pressed by the pressure given by the corresponding pressure block 45 to move downwards to compress each first spring 74, each reset button 50 is triggered downwards by the corresponding trigger rod 51 to disconnect the power supply of the corresponding power supply 49, the electromagnet 46 is disconnected from the magnet 82; the left end face of the third shell 47 is fixedly provided with a supporting block 11, the upper side of the supporting block 11 is provided with a sludge storage device 101, the sludge storage device 101 comprises a first box 41, the lower side of the first box 41 is provided with a first baffle 44, the right end of the first baffle 44 is rotatably connected with the fourth shell 35 through a first torsion spring 67, the lower side of the first torsion spring 67 is provided with a fixed block 69 and fixed in the fourth shell 35, a spring groove 63 with an opening facing to the left is arranged in the fixed block 69, the inner wall of the right side of the spring groove 63 is fixedly provided with a second spring 71, the left end of the second spring 71 is fixedly provided with a piston 70 which is slidably connected with the spring groove 63, the left end face of the piston 70 is fixedly provided with a sliding rod 68, the right end face of the sliding rod 68 is fixedly provided with a first string 39, the first string 39 is wound on the first reel 64, and the other end of the first string 39 is fixed, the second baffle 37 is rotatably connected to the fourth shell 35 through a second torsion spring 36, a second box 34 is arranged on the upper side of the second baffle 37, the first baffle 44 rotates to drive the second baffle 37 to rotate, the second box 34 freely falls onto the first baffle 44, and the first box 41 slides onto the 45 motorboat through the supporting block 11; the left side of the supporting block 11 is provided with a stirrer 12, the upper end surface of the stirrer 12 is fixedly provided with a first rotating shaft 13, the first rotating shaft 13 penetrates through a fifth shell 14 and is rotatably connected with the lower end surface of a first motor 60, the lower end surface of the first motor 60 is fixed on the upper end surface of the fifth shell 14, two sludge collecting devices 102 are symmetrically arranged front and back by taking the first rotating shaft 13 as a symmetry center, each sludge collecting device 102 comprises a first belt pulley 59 fixedly arranged on the first rotating shaft 13, a first belt 17 is rotatably arranged on the first belt pulley 59, the first belt 17 is rotatably connected with a second belt pulley 16, a third inner cavity 18 is arranged in the fifth shell 14, a first shaft sleeve 15 is fixedly arranged on the inner wall of the lower side of the third inner cavity 18, a second rotating shaft 58 is rotatably arranged in the first shaft sleeve 15, and the second belt pulley 16 is fixed on the second rotating shaft 58, the second rotating shaft 58 is fixedly provided with a helical blade 19, the fifth shell 14 is fixedly provided with a sixth shell 21, the sixth shell 21 is internally provided with a fourth inner cavity 33, the upper side of the fourth inner cavity 33 is communicated with the material conveying port 22, the front and the rear of the sixth shell 21 are respectively connected with a feeding pipe 57, the lower end surface of the feeding pipe 57 is fixedly provided with a filtering port 56, the first motor 60 rotates the first belt pulley 59 through the first rotating shaft 13, and the first belt pulley 59 rotates the second rotating shaft 58 through the first belt 17 to clean sludge; collect silt device 102 upside and be equipped with centrifugal sand removal device 103, centrifugal sand removal device 103 includes first pivot 13, first pivot 13 runs through seventh shell 23 and third belt pulley 38 fixed connection, it is equipped with second belt 26 to rotate on the third belt pulley 38, second belt 26 is connected with second belt pulley 25, be equipped with fifth inner chamber 27 in the seventh shell 23, with first pivot 13 is equipped with two second shaft sleeves 24 for symmetry center front and back symmetry and fixes on the inner wall of fifth inner chamber 27 downside, it is three each rotation is equipped with a third pivot 28 on the second belt pulley 25, the fixed blade 31 that is equipped with on third pivot 28, fixed two sieve meshes 30 that are equipped with around the blade 31, be equipped with two fine sand around the sieve mesh 30 and flow into chamber 62, fine sand flows into chamber 62 downside intercommunication second material conveying mouth 29, blade 31 passes through the rotation of third pivot 28 flows into the fine sand according to centrifugal force in the sieve mesh 30 .
Advantageously, the sludge transporting device 100 further comprises a sixth inner cavity 52 arranged in the third housing 47, a receiver 53 is fixedly arranged on the inner wall of the rear side of the sixth inner cavity 52, a second motor 54 is fixedly arranged on the left end surface of the receiver 53, the left end surface of the second motor 54 is rotatably connected with a torsion shaft 55, a second wire wheel 75 is fixedly arranged on the torsion shaft 55, a second string 73 is wound in the second wire wheel 75, and the second string 73 penetrates through the third housing 47 and the pressure block 72 and is fixedly connected with the lower end surface of the motorboat 45.
In the initial state, the buoyancy block 81 is in the floating state.
The first motor 60 is started to rotate the stirrer 12 through the first rotating shaft 13, the first belt pulley 59, the third belt pulley 38, the stirrer 12 stirs the sludge on the lower side, the first belt pulley 59 drives the second belt pulley 16 on the front and rear sides through the first belt 17, the second belt pulley 16 rotates the spiral blade 19 through the second rotating shaft 58 to generate a pressure from bottom to top in the fourth inner chamber 33, the feed pipe 57 adsorbs the sludge on the lower side to the fourth inner chamber 33, the sludge flows into the first tank 41 through the feed port 22 from the fourth inner chamber 33, the third belt pulley 38 rotates the second belt pulley 25 on the front and rear sides through the second belt 26, the second belt pulley 25 rotates the blade 31 through the third rotating shaft 28, the fine sand in the water flows into the fine sand flow-in chamber 62 through the sieve holes 30 according to a centrifugal force generated by the rotation of the blade 31, the fine sand flowing into the chamber 62 flows into the first tank 41 through the second feed port 29, when the sludge in the first box 41 reaches a certain weight, the first baffle 44 rotates downwards to make the first box 41 fall, the rotation of the first baffle 44 drives the second baffle 37 to also rotate downwards to make the second box 34 fall, the first baffle 44 slides down to the motorboat 45 through the slope on the supporting block 11, the first baffle 44 and the second baffle 37 reset, the second box 34 falls on the first baffle 44, the pressure block 72 drives the trigger rod 51 to move downwards to trigger the reset button 50 to turn off the power supply 49 under the action of gravity, the electromagnet 46 is disconnected with the magnet 82 after power failure, the motorboat 45 drives the first box 41 to move upwards under the buoyancy force, the second string 73 under the motorboat 45 is pulled out from the second reel 75 to float upwards, when the first box 41 floats out of the water, the motorboat 45 can ascend by a distance to make the buoyancy block 81 on the horizontal plane, and the buoyancy block 81 lifts up to drive the slide rod 80 to press the sensor 76 to be in a closed state under the buoyancy force, when the buoyancy block 81 floats out of the water, the sliding rod 80 freely falls due to the buoyancy of the buoyancy block 81 to start the sensor 76, the receiver 53 receives a signal to start the second motor 54 to rotate the second wire wheel 75 through the torsion shaft 55, the second string 73 is retracted to pull the motorboat 45 to the initial position, and the electromagnet 46 adsorbs the magnet 82 to fix the motorboat.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. The utility model provides a power station silt cleaning device, includes the motor boat, its characterized in that: the two sludge conveying devices are symmetrically arranged at the left end and the right end of the motorboat serving as a symmetrical center, each sludge conveying device comprises a sensor fixedly connected with the motorboat, one end of each sensor, which is far away from the motorboat, is fixedly provided with a first shell, a first inner cavity is arranged in the first shell, the inner wall of the upper side of the first inner cavity is fixedly provided with a chute, a slide bar is arranged in the chute in a sliding manner, the lower side of the slide bar is provided with a buoyancy block, the buoyancy block is arranged in the chute in a sliding manner, the lower end face of the first shell is fixedly provided with a magnet, the lower side of the magnet is provided with an electromagnet, the two electromagnets are fixedly connected with a second shell, a second inner cavity is arranged in the second shell, the inner wall of the lower side of the second inner cavity is fixedly provided with two power supplies in, one end, close to the motorboat, of the trigger rod is fixedly connected to the right end face of the pressure block, two first springs are fixedly arranged on the lower end face of the pressure block, the first springs are fixed on the upper end face of the third shell, the pressure block moves downwards under the pressure from the given pressure to compress the first springs, the trigger rod triggers the reset button downwards to disconnect the power supply, the electromagnet is disconnected with the magnet, and the motorboat rises according to the buoyancy of the motorboat; a supporting block is fixedly arranged on the left end face of the third shell, a sludge storage device is arranged on the upper side of the supporting block and comprises a first box, a first baffle is arranged on the lower side of the first box, the right end of the first baffle is rotatably connected with a fourth shell through a first torsion spring, a fixed block is arranged on the lower side of the first torsion spring and is fixedly arranged in the fourth shell, a spring groove with an opening facing to the left is arranged in the fixed block, a second spring is fixedly arranged on the inner wall of the right side of the spring groove, a piston which is slidably connected with the spring groove is fixedly arranged on the left end face of the second spring, a sliding rod is fixedly arranged on the left end face of the piston, a first thin rope is fixedly arranged on the right end face of the sliding rod, the first thin rope is wound on a first wire wheel, the other end of the first thin rope is fixedly arranged on the lower end face of the second baffle, a second box is arranged on the upper side of the second baffle, the rotation of the first baffle can drive the second baffle to rotate, the second box freely falls onto the first baffle, and the first box slides onto the motorboat through the supporting block; the sludge collecting device comprises a first belt pulley fixedly arranged on the first rotating shaft, a first belt is rotatably arranged on the first belt pulley, the first belt is rotatably connected with a second belt pulley, a third inner cavity is arranged in the fifth shell, a first shaft sleeve is fixedly arranged on the inner wall of the lower side of the third inner cavity, a second rotating shaft is rotatably arranged in the first shaft sleeve, the second belt pulley is fixedly arranged on the second rotating shaft, a spiral blade is fixedly arranged on the second rotating shaft, and a sixth shell is fixedly arranged on the fifth shell, a fourth inner cavity is formed in the sixth shell, the upper side of the fourth inner cavity is communicated with a material conveying port, a material feeding pipe is connected to the front and the rear of the sixth shell respectively, a filtering port is fixedly formed in the lower end face of the material feeding pipe, the first motor rotates the first belt pulley through the first rotating shaft, and the first belt pulley rotates the second rotating shaft through the first belt to clean sludge; the upper side of the sludge collecting device is provided with a centrifugal sand removing device which comprises the first rotating shaft, the first rotating shaft penetrates through the seventh shell to be fixedly connected with the third belt pulley, a second belt is rotatably arranged on the third belt pulley and connected with the second belt pulley, a fifth inner cavity is arranged in the seventh shell, two second shaft sleeves are symmetrically arranged in front and back by taking the first rotating shaft as a symmetric center and fixed on the inner wall of the lower side of the fifth inner cavity, three second belt pulleys are respectively provided with a third rotating shaft in a rotating way, the third rotating shaft is fixedly provided with a blade, the front part and the rear part of the blade are fixedly provided with two sieve pores, the front part and the rear part of each sieve pore are provided with two fine sand inflow cavities, the fine sand flows into chamber downside intercommunication second material transmission mouth, the blade passes through the rotation of third pivot is according to centrifugal force with aquatic fine sand flow in the sieve is downthehole.
2. The power station sludge cleaning apparatus of claim 1, wherein: silt conveyor still includes be equipped with the sixth inner chamber in the third shell, the fixed receiver that is equipped with of sixth inner chamber rear side inner wall, the fixed second motor that is equipped with of receiver left end face, second motor left end face rotates and connects the twist shaft, the fixed second wire wheel that is equipped with on the twist shaft, it has the second string to coil in the second wire wheel, the second string runs through the third shell with the pressure piece with terminal surface fixed connection under the motor boat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010923178.9A CN111997124A (en) | 2020-09-04 | 2020-09-04 | Power station silt cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010923178.9A CN111997124A (en) | 2020-09-04 | 2020-09-04 | Power station silt cleaning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111997124A true CN111997124A (en) | 2020-11-27 |
Family
ID=73468406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010923178.9A Withdrawn CN111997124A (en) | 2020-09-04 | 2020-09-04 | Power station silt cleaning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111997124A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112663643A (en) * | 2020-12-18 | 2021-04-16 | 王淑梅 | Prevent inside pipe blocking device when drawing water through to foundation ditch bottom |
-
2020
- 2020-09-04 CN CN202010923178.9A patent/CN111997124A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112663643A (en) * | 2020-12-18 | 2021-04-16 | 王淑梅 | Prevent inside pipe blocking device when drawing water through to foundation ditch bottom |
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Application publication date: 20201127 |
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| WW01 | Invention patent application withdrawn after publication |