CN112775103A - Instrument and meter dust collector based on negative pressure dust absorption principle - Google Patents
Instrument and meter dust collector based on negative pressure dust absorption principle Download PDFInfo
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- CN112775103A CN112775103A CN201911057677.8A CN201911057677A CN112775103A CN 112775103 A CN112775103 A CN 112775103A CN 201911057677 A CN201911057677 A CN 201911057677A CN 112775103 A CN112775103 A CN 112775103A
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- fixedly connected
- dust
- instrument
- negative pressure
- placing table
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
- B08B5/023—Cleaning travelling work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the technical field of instruments and meters and discloses an instrument and meter dust removal device based on a negative pressure dust absorption principle, which comprises a cabinet body, a cabinet door is hinged outside the cabinet body, a transparent plate is fixedly connected on the surface of the cabinet door, a fixed seat is fixedly connected at the bottom inside the cabinet body, the inside of the fixed seat is fixedly connected with a bearing, the inside of the bearing is fixedly connected with a rotating shaft, the outside of the rotating shaft is fixedly connected with a driven gear, the outside of the driven gear is engaged and connected with a driving gear, the inside of the driving gear is fixedly connected with a motor, the top of the rotating shaft is fixedly connected with a placing table, the top of the placing table is movably connected with a clamping component which is matched with the placing table through a rotating shaft, therefore, instruments and meters needing dust removal rotate on the placing table, the dust removal direction is increased, and the dust removal effect and the dust removal speed are improved.
Description
Technical Field
The invention relates to the technical field of instruments and meters, in particular to an instrument and meter dust removal device based on a negative pressure dust collection principle.
Background
The instruments and meters are instruments or equipment for detecting, measuring, observing and calculating various physical quantities, material components, physical property parameters and the like, and the vacuum leak detector, the pressure gauge, the length measuring instrument, the microscope, the multiplier and the like belong to instruments and meters, and the instruments and meters can improve, expand or supplement functions of people. The human sense organs are used for seeing, hearing, tasting and touching external things, and instruments such as microscopes, telescopes, sound level meters, acidometers, pyrometers, vacuum centrifugal concentrators and the like can improve and expand the functions of the human sense organs.
But current instrument and meter are mostly live working, because operational environment or self static often make instrument and meter adsorb a large amount of dusts, too much dust both can cause the hindrance to the instrument operation, influence the sensitivity of instrument, make the operation result inaccurate, also can influence the heat dissipation of instrument and meter self circuit, cause the component ageing, lead to instrument to scrap.
In addition, the existing workers remove dust indoors for instruments and meters, often manually blow the instruments and meters by using a high-pressure air gun, so that the dust removal efficiency is poor, the operation is troublesome, dust can fly upwards to pollute air, the air environment with multiple dusts not only influences the health of the workers, but also increases the dust adsorption speed of the instruments and meters.
In order to solve the problems, the invention provides an instrument dust removal device based on a negative pressure dust absorption principle, which has the advantages of high dust removal speed, simplicity in operation, automatic dust removal and no pollution to air, the instrument dust removal device enables an instrument needing dust removal to rotate on a placing table through the matching use of a rotating shaft and the placing table, the dust removal direction is increased, the dust removal effect and the dust removal speed are improved, the automatic clamping is realized through the matching use of the placing table and a clamping assembly, the manual supporting effect is avoided, the stability of the instrument is ensured, the use precision of the instrument is prevented from being influenced due to the collision of the instrument and a cabinet body, the effect of blowing up dust in the instrument is realized through the matching use of an air nozzle and the placing table, the dust removal purpose is realized, and the influence of the dust on the use of the instrument is prevented. The problems of poor dust removal efficiency, troublesome operation and pollution to air caused by dust removal are solved.
Disclosure of Invention
In order to realize the purposes of high dust removal speed, simple operation, automatic dust removal and no pollution to air, the invention provides the following technical scheme: the utility model provides an instrument dust collector based on negative pressure dust absorption principle, includes the cabinet body, cabinet door, transparent plate, fixing base, bearing, pivot, driven gear, driving gear, motor, places platform, centre gripping subassembly, baffle, telescopic link, spring, clamping jaw, inflator, air nozzle, dust absorption mouth, negative pressure motor, breather pipe, dust removal subassembly, box body, filter, connecting rod, backup pad, dust falling mouth, gas outlet, collection dirt steamer tray, baffle.
The positions and the connection relations of the structures are as follows:
a cabinet door is hinged outside the cabinet body, a transparent plate is fixedly connected on the surface of the cabinet door, a fixed seat is fixedly connected at the bottom inside the cabinet body, the inside of the fixed seat is fixedly connected with a bearing, the inside of the bearing is fixedly connected with a rotating shaft, the outside of the rotating shaft is fixedly connected with a driven gear, the outside of the driven gear is engaged and connected with a driving gear, the inside of the driving gear is fixedly connected with a motor, the top of the rotating shaft is fixedly connected with a placing table, the top of the placing table is movably connected with a clamping component, the interior of the cabinet body is fixedly connected with an air injection cylinder, an air nozzle is fixedly connected with the outside of the air injection cylinder, a dust absorption opening is arranged at the top of the cabinet body, the top fixedly connected with negative pressure motor of dust absorption mouth, the outside fixedly connected with breather pipe of negative pole motor, the one end fixedly connected with dust removal component that negative pressure motor was kept away from to the breather pipe.
The centre gripping subassembly includes the baffle, the outside fixedly connected with telescopic link of baffle, the inside swing joint of telescopic link has the spring, the one end fixedly connected with clamping jaw of baffle is kept away from to the telescopic link.
The dust removal component comprises a box body, a filter plate is sleeved in the box body in a movable mode, a connecting rod is fixedly connected to the inside of the filter plate, a supporting plate is movably connected to the bottom of the filter plate, a dust falling port is formed in the supporting plate, an air outlet is movably connected to the inside of the box body, a dust collection drawer is movably connected to the bottom of the supporting plate, and a partition plate is fixedly connected to the inside of the dust collection drawer.
Preferably, the transparent plate is made of transparent glass.
Preferably, the placing table is circular, and the rotating shaft is fixedly connected to the circle center of the bottom of the placing table.
Preferably, the two groups of clamping assemblies are movably connected to the top of the placing table respectively, the connecting line of the centers of the two groups of clamping assemblies passes through the circle center of the placing table, and the structural quantity and the connection relation of the two groups of clamping assemblies are completely the same.
Preferably, the baffle is fixedly connected with the placing table.
Preferably, the spring is fixedly connected with the baffle and the spring is fixedly connected with the clamping jaw.
Preferably, the number of the gas cylinders and the number of the gas nozzles are two, and the two gas cylinders are fixedly connected to the side wall of the inner part of the cabinet body and located at positions higher than the placing table.
Preferably, the negative pressure motor and the dust removal assembly are fixedly connected to the top of the cabinet body.
Preferably, the filter plates are provided with five to seven filter plates which are uniformly and movably connected inside the box body.
Preferably, the connecting rod is fixedly connected with the box body.
Preferably, five to seven dust falling ports are arranged and are communicated with the upper part and the lower part of the bearing plate.
Preferably, four to six partition plates are fixedly connected to the inner part of the dust collection drawer respectively, and the partition plates are positioned between the two dust falling openings.
(III) advantageous effects
Compared with the prior art, the invention provides an instrument dust removal device based on a negative pressure dust collection principle, which has the following beneficial effects:
1. this instrument and meter dust collector based on negative pressure dust absorption principle uses through the pivot with the cooperation of placing the platform to the instrument and meter that makes to remove dust is placing the bench and is rotating, increases the position of removing dust, thereby promotes the effect of removing dust and the speed of removing dust.
2. This instrument and meter dust collector based on negative pressure dust absorption principle uses through the cooperation of placing platform and centre gripping subassembly to reach automatic centre gripping, avoid artifical effect of holding, guarantee instrument and meter's stability, prevent to influence instrument and meter's use accuracy because of colliding with of instrument and the cabinet body.
3. This instrument dust collector based on negative pressure dust absorption principle uses through the air nozzle and the cooperation of placing the platform to reach the effect of blowing the inside dust of instrument, reach the purpose of automatic dust removal, prevent the influence that the dust used to instrument.
4. This instrument and meter dust collector based on negative pressure dust absorption principle uses through the cooperation of dust absorption mouth and negative pressure motor to reach the effect of absorbing the internal dust of cabinet, prevent that the secondary pollution of the internal dust of cabinet to instrument and meter, guarantee the effect of removing dust, and then guarantee instrument and meter's use accuracy and life.
5. This instrument and meter dust collector based on negative pressure dust absorption principle uses through the cooperation of filter and collection dirt steamer tray to reach the effect of adsorbing the gaseous dust of exhaust, guarantee operational environment's clean, prevent to clear away the pollution of instrument and meter's dust to operational environment, guarantee staff's health.
Drawings
FIG. 1 is a schematic view of the overall connection of the structure of the present invention;
FIG. 2 is a schematic front view of the structure of the present invention;
FIG. 3 is a schematic top view of the arrangement of the placement table and clamping assembly of the present invention;
FIG. 4 is a schematic view of the structural clamping assembly of the present invention;
FIG. 5 is a schematic view of the dust collecting assembly of the present invention;
FIG. 6 is a top view of the dust collecting drawer of the present invention.
In the figure: 1-cabinet body, 2-cabinet door, 3-transparent plate, 4-fixed seat, 5-bearing, 6-rotating shaft, 7-driven gear, 8-driving gear, 9-motor, 10-placing table, 11-clamping component, 111-baffle, 112-telescopic rod, 113-spring, 114-clamping jaw, 12-air injector, 13-air nozzle, 14-dust suction port, 15-negative pressure motor, 16-air pipe, 17-dust removing component, 171-box body, 172-filter plate, 173-connecting rod, 174-supporting plate, 175-dust falling port, 176-air outlet, 177-dust collecting drawer and 178-partition plate.
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. 1-6, an instrument and meter dust removing device based on the negative pressure dust suction principle includes a cabinet 1, a cabinet door 2, a transparent plate 3, a fixing seat 4, a bearing 5, a rotating shaft 6, a driven gear 7, a driving gear 8, a motor 9, a placing table 10, a clamping assembly 11, a baffle 111, a telescopic rod 112, a spring 113, a clamping jaw 114, an air injection cylinder 12, an air injection nozzle 13, a dust suction port 14, a negative pressure motor 15, an air pipe 16, a dust removing assembly 17, a box 171, a filter plate 172, a connecting rod 173, a supporting plate 174, a dust falling port 175, an air outlet 176, a dust collecting drawer 177, and a partition plate 178.
The positions and the connection relations of the structures are as follows:
the external of the cabinet body 1 is hinged with a cabinet door 2, the surface of the cabinet door 2 is fixedly connected with a transparent plate 3, the transparent plate 3 is made of transparent glass, the bottom of the internal of the cabinet body 1 is fixedly connected with a fixed seat 4, the internal of the fixed seat 4 is fixedly connected with a bearing 5, the internal of the bearing 5 is fixedly connected with a rotating shaft 6, the external of the rotating shaft 6 is fixedly connected with a driven gear 7, the external meshing of the driven gear 7 is connected with a driving gear 8, the internal of the driving gear 8 is fixedly connected with a motor 9, the top of the rotating shaft 6 is fixedly connected with a placing table 10, the placing table 10 is circular, the rotating shaft 6 is fixedly connected with the circle center of the bottom of the placing table 10, the instrument and the meter which need to be dedusted can rotate on the placing table 10 by the matching of the rotating shaft 6 and the placing table 10, centre gripping subassembly 11 has two sets ofly, swing joint is respectively at the top of placing platform 10, and the line at two sets of centre gripping subassembly 11 centers is through the centre of a circle of placing platform 10, and two sets of centre gripping subassembly 11's structure quantity and relation of connection are the same completely, uses through the cooperation of placing platform 10 and centre gripping subassembly 11 to reach automatic centre gripping, avoid the effect of artifical support, guarantee instrument and meter's stability, prevent to influence instrument and meter's use accuracy because of colliding with of instrument and the cabinet body.
The inside of the cabinet body 1 is fixedly connected with an air injection cylinder 12, the outside of the air injection cylinder 12 is fixedly connected with an air nozzle 13, the number of the air injection cylinder 12 and the number of the air nozzle 13 are respectively two, the two air injection cylinders 12 are fixedly connected to the side wall inside the cabinet body 1 and are positioned higher than the position of the placing table 10, the air nozzle 13 and the placing table 10 are used in a matched mode, so that the effect of blowing up dust inside instruments and meters is achieved, the purpose of automatic dust removal is achieved, the influence of the dust on the use of the instruments and meters is prevented, a dust suction opening 14 is formed in the top of the cabinet body 1, a negative pressure motor 15 is fixedly connected to the top of the dust suction opening 14, the effect of absorbing the dust inside the cabinet body 1 is achieved through the matched use of the dust suction opening 14 and the negative pressure motor 15, the secondary pollution of the dust inside the cabinet body 1 on the instruments and meters is prevented, one end of the vent pipe 16 far away from the negative pressure motor 15 is fixedly connected with a dust removal assembly 17, and the negative pressure motor 15 and the dust removal assembly 17 are fixedly connected to the top of the cabinet body 1.
The clamping assembly 11 comprises a baffle 111 fixedly connected with a placing table, an expansion link 112 fixedly connected with the outside of the baffle 111, a spring 113 movably connected with the inside of the expansion link 112, the spring 113 fixedly connected with the baffle 111 and the spring 113 fixedly connected with a clamping jaw 114, and the expansion link 112 far away from the clamping jaw 114.
The dust removal assembly 17 comprises a box body 171, a filter plate 172 is sleeved in the box body 171 in a movable mode, five to seven filter plates 172 are arranged, the filter plates 172 are uniformly and movably connected inside the box body 171, a connecting rod 173 is fixedly connected inside the filter plates 172, the connecting rod 173 is fixedly connected with the box body 171, a supporting plate 174 is movably connected to the bottom of the filter plates 172, a dust falling port 175 is formed in the supporting plate 174, five to seven dust falling ports 175 are formed in the dust falling port 175 and communicated with the upper portion and the lower portion of a bearing plate 174, an air outlet 176 is movably connected inside the box body 171, a dust collection drawer 177 is movably connected to the bottom of the supporting plate 174, the filter plates 172 are used in cooperation with the dust collection drawer 177, so that the effect of adsorbing and discharging gas dust is achieved, the cleanness of a working environment is guaranteed, the pollution of the dust of instruments and meters, four to six partitions 178 are fixedly connected to the inside of the dust drawer 177, respectively, and the partitions 178 are located between the two dust falling ports 175.
The working principle is that when dust is removed, an instrument is placed on the placing table 10 and positioned between the two clamping jaws 144, because the baffle 111 is fixedly connected with the placing table 10, the baffle 111 is fixedly connected with the spring 113, the spring 113 is fixedly connected with the clamping jaws 114, under the elastic force of the spring 114, the instrument is clamped by the two clamping jaws 114, meanwhile, the motor 9 is fixedly connected with the driving gear 8, the driving gear 8 is meshed with the driven gear 7, the driven gear 7 is fixedly connected with the rotating shaft 6, the rotating shaft 6 is fixedly connected with the placing table 10, the motor 9 drives the driving gear 8 to rotate, the driving gear 8 drives the driven gear 7 to rotate, the driven gear 7 drives the rotating shaft 6 to rotate, the rotating shaft 6 drives the placing table 10 to rotate, the air injection cylinder 12 and the air injection nozzle 13 start air injection, and because the placing table 10 rotates, the air injection nozzle 13 blows different directions of the instrument, the dust is dispersed, negative pressure motor 15 and dust absorption mouth 14 fixed connection, dust absorption mouth 14 produces the negative pressure, begins to adsorb the dust in the cabinet body 1, negative pressure motor 15 and breather pipe 16 fixed connection, breather pipe 16 and dust removal subassembly 17 fixed connection, and dust removal subassembly 17 includes filter 172, and gas passes through a layer of filter 172, reaches the effect of removing dust, discharges from gas outlet 176 simultaneously, and the dust falls into collection drawer 177 from dust falling mouth 175, collects.
To sum up, this instrument dust collector based on negative pressure dust absorption principle uses through pivot 6 and the cooperation of placing platform 10 to the instrument that makes to remove dust rotates on placing platform 10, increases the position of removing dust, thereby promotes the effect of removing dust and the speed of removing dust.
Simultaneously, use through the cooperation of placing platform 10 and centre gripping subassembly 11 to reach automatic centre gripping, avoid artifical effect of supporting, guarantee instrument's stability, prevent to influence instrument's use accuracy because of colliding with of instrument and meter and the cabinet body 1.
Simultaneously, through the cooperation use of air nozzle 13 with place platform 10 to reach the effect of blowing the inside dust of instrument and meter, reach the purpose of automatic dust removal, prevent the influence that the dust used to instrument and meter.
Simultaneously, use through the cooperation of dust absorption mouth 14 and negative pressure motor 15 to reach the effect of absorbing the interior dust of the cabinet body 1, prevent that the interior dust of the cabinet body 1 from to instrument's secondary pollution, guarantee the effect of removing dust, and then guarantee instrument's use accuracy and life.
Simultaneously, use through the cooperation of filter 172 and dust collection steamer tray 177 to reach the effect of adsorbing exhaust gas dust, guarantee operational environment's clean, prevent to clear away the pollution of instrument's dust to operational environment, guarantee staff's health.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides an instrument and meter dust collector based on negative pressure dust absorption principle, includes cabinet body (1), its characterized in that: the cabinet is characterized in that a cabinet door (2) is hinged to the outside of the cabinet body (1), a transparent plate (3) is fixedly connected to the surface of the cabinet door (2), a fixing seat (4) is fixedly connected to the bottom inside the cabinet body (1), a bearing (5) is fixedly connected to the inside of the fixing seat (4), a rotating shaft (6) is fixedly connected to the inside of the bearing (5), a driven gear (7) is fixedly connected to the outside of the rotating shaft (6), a driving gear (8) is connected to the outside of the driven gear (7) in a meshed manner, a motor (9) is fixedly connected to the inside of the driving gear (8), a placing table (10) is fixedly connected to the top of the rotating shaft (6), a clamping assembly (11) is movably connected to the top of the placing table (10), a spraying nozzle (12) is fixedly connected to the inside of the cabinet body (1), a dust suction port (14) is formed in the top of the cabinet body (1), a negative pressure motor (15) is fixedly connected to the top of the dust suction port (14), a vent pipe (16) is fixedly connected to the outside of the negative electrode motor (15), and a dust removal assembly (17) is fixedly connected to one end, far away from the negative pressure motor (15), of the vent pipe (16);
the clamping assembly (11) comprises a baffle (111), an expansion rod (112) is fixedly connected to the outer portion of the baffle (111), a spring (113) is movably connected to the inner portion of the expansion rod (112), and a clamping jaw (114) is fixedly connected to one end, far away from the baffle (111), of the expansion rod (112);
the dust removal assembly (17) comprises a box body (171), a filter plate (172) is sleeved on the inner portion of the box body (171), a connecting rod (173) is fixedly connected to the inner portion of the filter plate (172), a supporting plate (174) is movably connected to the bottom of the filter plate (172), a dust falling port (175) is formed in the inner portion of the supporting plate (174), an air outlet (176) is movably connected to the inner portion of the box body (171), a dust collection drawer (177) is movably connected to the bottom of the supporting plate (174), and a partition plate (178) is fixedly connected to the inner portion of the dust collection drawer (177).
2. The instrument and meter dust removing device based on the negative pressure dust suction principle according to claim 1, wherein: the placing table (10) is circular, and the rotating shaft (6) is fixedly connected to the circle center of the bottom of the placing table (10).
3. The instrument and meter dust removing device based on the negative pressure dust suction principle according to claim 1, wherein: the two groups of clamping assemblies (11) are movably connected to the top of the placing table (10) respectively, the connecting line of the centers of the two groups of clamping assemblies (11) passes through the circle center of the placing table (10), and the structural quantity and the connection relation of the two groups of clamping assemblies (11) are completely the same.
4. The instrument and meter dust removing device based on the negative pressure dust suction principle according to claim 1, wherein: the spring (113) is fixedly connected with the baffle (111) and the spring (113) is fixedly connected with the clamping jaw (114).
5. The instrument and meter dust removing device based on the negative pressure dust suction principle according to claim 1, wherein: the cabinet is characterized in that the number of the air injection cylinders (12) and the number of the air nozzles (13) are respectively two, and the two air injection cylinders (12) are fixedly connected to the side wall inside the cabinet body (1) and are located at positions higher than the placement table (10).
6. The instrument and meter dust removing device based on the negative pressure dust suction principle according to claim 1, wherein: the negative pressure motor (15) and the dust removal assembly (17) are fixedly connected to the top of the cabinet body (1).
7. The instrument and meter dust removing device based on the negative pressure dust suction principle according to claim 1, wherein: five to seven filter plates (172) are arranged and are uniformly movably connected inside the box body (171).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911057677.8A CN112775103A (en) | 2019-11-01 | 2019-11-01 | Instrument and meter dust collector based on negative pressure dust absorption principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911057677.8A CN112775103A (en) | 2019-11-01 | 2019-11-01 | Instrument and meter dust collector based on negative pressure dust absorption principle |
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| Publication Number | Publication Date |
|---|---|
| CN112775103A true CN112775103A (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911057677.8A Pending CN112775103A (en) | 2019-11-01 | 2019-11-01 | Instrument and meter dust collector based on negative pressure dust absorption principle |
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| Country | Link |
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| CN (1) | CN112775103A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113262996A (en) * | 2021-05-17 | 2021-08-17 | 南京林业大学 | Dust removal device for electronic product and use method |
-
2019
- 2019-11-01 CN CN201911057677.8A patent/CN112775103A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113262996A (en) * | 2021-05-17 | 2021-08-17 | 南京林业大学 | Dust removal device for electronic product and use method |
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Application publication date: 20210511 |
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| WD01 | Invention patent application deemed withdrawn after publication |