CN112023584A - Weaving is with weaving quick-witted weaving dust collection device of weaving - Google Patents

Weaving is with weaving quick-witted weaving dust collection device of weaving Download PDF

Info

Publication number
CN112023584A
CN112023584A CN202010883297.6A CN202010883297A CN112023584A CN 112023584 A CN112023584 A CN 112023584A CN 202010883297 A CN202010883297 A CN 202010883297A CN 112023584 A CN112023584 A CN 112023584A
Authority
CN
China
Prior art keywords
fixedly connected
textile
chamber
water
dust collecting
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.)
Pending
Application number
CN202010883297.6A
Other languages
Chinese (zh)
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202010883297.6A priority Critical patent/CN112023584A/en
Publication of CN112023584A publication Critical patent/CN112023584A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/60Combinations of devices covered by groups B01D46/00 and B01D47/00

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

The invention discloses a textile dust collecting device of a textile machine for textile, and belongs to the technical field of dust collection. A textile dust collecting device of a textile machine for spinning comprises a working chamber, wherein water chambers are symmetrically and fixedly connected to two sides of the working chamber, a communicating pipe is arranged between the water chambers and the working chamber, a one-way valve is arranged in the communicating pipe, an air inlet is fixedly connected to the upper end of the working chamber, a support frame is fixedly connected in the air inlet, a motor is fixedly connected to the support frame, a rotating shaft is rotatably connected to the support frame, one end of the rotating shaft is fixedly connected with the output end of the motor, and one end of the rotating shaft, close to the motor, is fixedly connected with a blade; according to the invention, impurities in air are filtered through the working cavity, the air inlet, the water cavity, the first filter screen, the second filter screen and the like, and water resources are recycled through the check valve, the third filter screen and the like, so that the waste of the water resources is reduced, and the health of master workers is protected.

Description

Weaving is with weaving quick-witted weaving dust collection device of weaving
Technical Field
The invention relates to the technical field of dust collection, in particular to a textile dust collecting device of a textile machine for textile.
Background
The textile machine is also called a spinning machine, a weaving machine, a cotton spinning machine and the like, the ancient textile machine is a manually driven weaving machine, and the textile machine is a tool for processing raw materials such as threads, silk, hemp and the like into silk threads and then weaving the silk threads into cloth;
textile machine can produce a large amount of fibre impurity at the during operation, these fibre impurity fly to the air, it is easy to harm workman's healthy to be inhaled by the workman, current dust collection device, most inhale in the weaving machine top and filter, make part fibre impurity inhaled by the workman easily, dust collection device is when handling the impurity of inhaling, need consume the water resource, and current device can not play the effect of using water wisely, consequently, according to current demand propose a weaving with weaving quick-witted weaving dust collection device.
Disclosure of Invention
The invention aims to solve the problems of filtering impurities in air and saving water, and provides a textile dust collecting device of a textile machine for textile.
In order to achieve the purpose, the invention adopts the following technical scheme:
a textile dust collecting device of a textile machine for textile comprises a working chamber, wherein water chambers are symmetrically and fixedly connected with the two sides of the working chamber, a communicating pipe is arranged between the water cavity and the working cavity, a one-way valve is arranged in the communicating pipe, the upper end of the working cavity is fixedly connected with an air inlet, a support frame is fixedly connected in the air inlet, a motor is fixedly connected on the support frame, a rotating shaft is rotatably connected on the support frame, one end of the rotating shaft is fixedly connected with the output end of the motor, one end of the rotating shaft close to the motor is fixedly connected with the blade, the rotating shaft is rotationally connected with the working cavity, a plurality of groups of second filter screens are fixedly connected on the rotating shaft, the upper end of the second filter screen is connected with a collecting cavity, the collecting cavity is connected with the working cavity in a sliding mode, the collecting cavity is attached to the rotating shaft, the rotating shaft is fixedly connected with a scraping rod, and the scraping rod is attached to the collecting cavity.
Preferably, the water cavity upper end is connected with the pipe that absorbs water, the one end that the water cavity was kept away from to the pipe that absorbs water is connected with the air inlet, the working chamber bilateral symmetry is equipped with the outlet duct, the one end fixedly connected with pressure pipe of working chamber is kept away from to the outlet duct, pressure pipe one end is connected with the water cavity, the one end fixedly connected with decompression piece that the water cavity was kept away from to the pressure pipe, be equipped with exhaust hole, spring groove in the decompression piece, be equipped with the ball in the exhaust hole, the spring groove is equipped with thrust spring, thrust spring both ends respectively with ball, decompression piece fixed connection.
Preferably, the upper end of the air inlet is fixedly connected with a first filter screen.
Preferably, an arc-shaped pulling block is fixedly connected to the collection cavity.
Preferably, the bottom end of the collecting cavity is fixedly connected with a third filter screen.
Preferably, the thrust spring is coated with a rust-proof paint.
Preferably, the mesh apertures of the first filter screen, the second filter screen and the third filter screen are reduced in sequence.
Preferably, the inlet is tapered.
Preferably, the collection chamber is fan-shaped, and only one side of the collection chamber is open.
Preferably, the diameter of the blocking ball is larger than that of the vent hole.
Compared with the prior art, the invention provides a textile dust collecting device of a textile machine for textile, which has the following beneficial effects:
when the device is used, the device is placed below a textile machine, impurities generated in the textile process are conveniently sucked into the device, the purpose of processing the impurities from the source is achieved, the impurities are prevented from flying in the air, the motor is started after the device is placed, the motor drives the rotating shaft to rotate, and further drives the blades, the second filter screen and the scraping rod to rotate, the blades rotate to generate suction force to suck the air with the impurities into the working cavity, the air flow rate of the mouth of the water suction pipe is accelerated and the pressure intensity is reduced due to the rotation of the blades, the pressure intensity in the water cavity is larger than the pressure intensity of the mouth of the water suction pipe, the water in the water cavity is sprayed into the air inlet through the water suction pipe due to the pressure intensity difference, the water is mixed with the impurities in the air, the impurities with the water are blown onto the second filter screen under the blowing of the blades, the impurities on the second filter screen are blown into the collecting cavity due to the rotation, part of impurities may fall to the upper end of the collecting cavity, the impurities at the upper end of the collecting cavity are scraped onto the second filter screen through the scraping of the scraping rod, and the third filter screen is fixedly connected to the bottom end of the collecting cavity, so that moisture seeped from the impurities can be discharged, the purpose of saving water is achieved, the collecting cavity can be taken out by pulling the arc-shaped pulling block, and the impurities in the collecting cavity are cleaned;
the pressure in the working cavity is increased due to continuous air suction into the working cavity, the air in the working cavity is discharged into the pressure pipe through the air outlet pipe, the pressure in the water cavity is increased due to the fact that the pressure pipe is communicated with the water cavity, water in the water cavity is further sprayed into the air inlet through the water suction pipe, mixing of the water and impurities is promoted, the impurities in the air are better filtered, when the liquid level of accumulated water at the bottom of the working cavity is higher than the liquid level of the water in the water cavity, the one-way valve is opened, the water in the working cavity flows back to the water cavity, recycling of the water is promoted, waste of water resources is reduced, when the pressure in the water cavity is too high, the pressure can push the blocking ball away, the thrust spring is compressed, part of the air is released, and when the pressure is reduced, the blocking ball returns to the original position under the thrust.
The device has the advantages that the device can filter impurities in the air through the working cavity, the air inlet, the water cavity, the first filter screen, the second filter screen and the like, the water resource recycling is realized through the check valve, the third filter screen and the like, the waste of the water resource is reduced, and the health of workers is protected.
Drawings
FIG. 1 is a schematic cross-sectional view of a dust collecting apparatus of a textile machine for textile according to the present invention;
FIG. 2 is a schematic sectional view of a top view of a textile dust collecting apparatus of a textile machine according to the present invention;
FIG. 3 is a schematic view showing a structure of a portion A of a textile dust collecting apparatus of a textile machine according to the present invention;
FIG. 4 is a schematic view showing a structure of a dust collecting apparatus of a textile machine for textile use in accordance with the present invention, which is shown in a portion B of FIG. 1
FIG. 5 is a schematic view of a collecting chamber of a dust collecting device of a textile machine for textile according to the present invention;
FIG. 6 is a rear view schematically showing a dust collecting device of a textile machine for textile according to the present invention.
In the figure: 1. a working chamber; 2. an air inlet; 3. a water chamber; 4. a first filter screen; 5. a motor; 6. a support frame; 7. a blade; 8. a rotating shaft; 9. a suction pipe; 10. a second filter screen; 11. a pressure pipe; 12. an air outlet pipe; 13. a scraping rod; 14. a collection chamber; 15. an arc-shaped pulling block; 16. a pressure reducing block; 17. a one-way valve; 18. an exhaust hole; 19. blocking the ball; 20. a thrust spring; 21. a spring slot; 22. and a third filter screen.
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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
referring to fig. 1-6, a textile dust collecting device of a textile machine for textile comprises a working chamber 1, water chambers 3 are symmetrically and fixedly connected with two sides of the working chamber 1, a communicating pipe is arranged between the water chambers 3 and the working chamber 1, a one-way valve 17 is arranged in the communicating pipe, an air inlet 2 is fixedly connected with the upper end of the working chamber 1, a support frame 6 is fixedly connected in the air inlet 2, a motor 5 is fixedly connected with the support frame 6, a rotating shaft 8 is rotatably connected with the support frame 6, one end of the rotating shaft 8 is fixedly connected with the output end of the motor 5, one end of the rotating shaft 8 close to the motor 5 is fixedly connected with a blade 7, the rotating shaft 8 is rotatably connected with the working chamber 1, a plurality of groups of second filter screens 10 are fixedly connected with the rotating shaft 8, a collecting chamber 14 is connected with the upper end of the second filter screens 10, the collecting chamber 14, the scraping rod 13 is attached to the collecting cavity 14;
3 upper ends in water cavity are connected with the pipe 9 that absorbs water, the one end that the water cavity 3 was kept away from to the pipe 9 that absorbs water is connected with air inlet 2, 1 bilateral symmetry in working cavity is equipped with outlet duct 12, the one end fixedly connected with pressure pipe 11 of working cavity 1 is kept away from to outlet duct 12, 11 one end in pressure pipe is connected with water cavity 3, the one end fixedly connected with decompression piece 16 that water cavity 3 was kept away from to pressure pipe 11, be equipped with exhaust hole 18 in the decompression piece 16, spring groove 21, be equipped with ball retainer 19 in the exhaust hole 18, spring groove 21 is equipped with thrust spring 20, thrust spring 20 both ends respectively with ball retainer 19, 16 fixed connection.
When the device is used, the device is placed below a textile machine, impurities generated in the textile process can be conveniently sucked into the device, the purpose of removing the impurities from the source is achieved, the impurities are prevented from flying in the air, the motor 5 is started after the device is placed, the motor 5 can use but is not limited to Y160M2-2, the motor 5 drives the rotating shaft 8 to rotate, further the blade 7, the second filter screen 10 and the scraping rod 13 are driven to rotate, the blade 7 rotates to generate suction force to suck the air with the impurities into the working chamber 1, the air flow rate at the pipe opening of the water suction pipe 9 is accelerated and the pressure is reduced due to the rotation of the blade 7, the pressure in the water chamber 3 is greater than the pressure at the pipe opening of the water suction pipe 9, the water is sprayed into the air inlet 2 through the water suction pipe 9 due to the pressure difference, the water is mixed with the impurities in the air, the impurities with the water are blown onto the second filter screen 10 by the, because the second filter screen 10 rotates, the collection cavity 14 does not rotate, so that impurities on the second filter screen 10 are scraped into the collection cavity 14, part of the impurities can fall to the upper end of the collection cavity 14, the impurities at the upper end of the collection cavity 14 are scraped onto the second filter screen 10 through the scraping of the scraping rod 13, and because the bottom end of the collection cavity 14 is fixedly connected with the third filter screen 22, moisture seeped from the impurities can be discharged, so that the purpose of saving water is achieved, and the collection cavity 14 can be taken out by pulling the arc-shaped pull block 15 to clean the impurities in the collection cavity;
because air is continuously sucked into the working cavity 1, the pressure intensity in the working cavity 1 is increased, the air in the working cavity 1 is discharged into the pressure pipe 11 through the air outlet pipe 12, because the pressure pipe 11 is communicated with the water cavity 3, the pressure in the water cavity 3 is increased, water in the water cavity 3 is further sprayed into the air inlet 2 through the water suction pipe 9, the mixing of the water and impurities is promoted, the impurities in the air are better filtered, when the accumulated water level at the bottom of the working cavity 1 is higher than the level of the water in the water cavity 3, the one-way valve 17 is opened to make the water in the working cavity 1 flow back to the water cavity 3, thereby promoting the recycling of the water, reducing the waste of water resources, when the pressure in the water chamber 3 is too high, the pressure pushes the blocking ball 19 away, the thrust spring 20 is compressed to release part of air, and when the pressure is reduced, the blocking ball 19 returns to the original position under the thrust of the thrust spring 20.
Example 2:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: the upper end of the air inlet 2 is fixedly connected with a first filter screen 4 for preventing the cloth pieces from falling into the working cavity 1.
Example 3:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: an arc-shaped pull block 15 is fixedly connected to the collection cavity 14, so that the collection cavity 14 can be conveniently taken out.
Example 4:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: the bottom end of the collecting cavity 14 is fixedly connected with a third filter screen 22, which is convenient for discharging water seeped from impurities.
Example 5:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: the thrust spring 20 is coated with the anti-rust paint, so that the service life of the thrust spring 20 is prolonged.
Example 6:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: the mesh apertures of the first filter screen 4, the second filter screen 10 and the third filter screen 22 are reduced in sequence, so that impurities can be filtered sufficiently.
Example 7:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: the air inlet 2 is conical to facilitate air intake.
Example 8:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: the collection cavity 14 is fan-shaped, and only one side of the collection cavity 14 is open, so that impurities on the second filter screen 10 can be conveniently collected.
Example 9:
referring to fig. 1 to 6, a textile dust collecting apparatus of a textile machine for textile use, substantially the same as in embodiment 1, further comprising: the diameter of the stop ball 19 is larger than that of the vent hole 18, so that the vent hole 18 can be conveniently plugged.
According to the invention, impurities in the air are filtered through the working cavity 1, the air inlet 2, the water cavity 3, the first filter screen 4, the second filter screen 10 and the like, and the water resource is recycled through the check valve 17, the third filter screen 22 and the like, so that the waste of the water resource is reduced, and the health of teachers and masters of workers is protected.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (9)

1. The textile dust collecting device of the textile machine for spinning is characterized by comprising a working chamber (1), wherein water chambers (3) are symmetrically and fixedly connected to two sides of the working chamber (1), a communicating pipe is arranged between each water chamber (3) and the working chamber (1), a one-way valve (17) is arranged in each communicating pipe, an air inlet (2) is fixedly connected to the upper end of the working chamber (1), a support frame (6) is fixedly connected to the inside of each air inlet (2), a motor (5) is fixedly connected to each support frame (6), a rotating shaft (8) is rotatably connected to each support frame (6), one end of each rotating shaft (8) is fixedly connected with the output end of each motor (5), one end, close to each motor (5), of each rotating shaft (8) is fixedly connected with a blade (7), each rotating shaft (8) is rotatably connected with the working chamber (1), and a plurality of groups of second filter screens (10) are fixedly connected, second filter screen (10) upper end is connected with collects chamber (14), collect chamber (14) and working chamber (1) sliding connection, collect chamber (14) and paste mutually in pivot (8), fixedly connected with scrapes pole (13) on pivot (8), scrape pole (13) and paste mutually with collecting chamber (14).
2. The textile dust collecting device of the textile machine for textile use according to claim 1, wherein a suction pipe (9) is connected to an upper end of the water chamber (3), one end of the suction pipe (9) far away from the water chamber (3) is connected with the air inlet (2), air outlet pipes (12) are symmetrically arranged on two sides of the working chamber (1), one end of each air outlet pipe (12) far away from the working chamber (1) is fixedly connected with a pressure pipe (11), one end of each pressure pipe (11) is connected with the water chamber (3), one end of each pressure pipe (11) far away from the water chamber (3) is fixedly connected with a pressure reducing block (16), an exhaust hole (18) and a spring groove (21) are arranged in each pressure reducing block (16), a blocking ball (19) is arranged in each exhaust hole (18), a thrust spring (20) is arranged in each spring groove (21), and two ends of each thrust spring (20) are respectively connected with the, The decompression block (16) is fixedly connected, and the upper end of the air inlet (2) is fixedly connected with a first filter screen (4).
3. Textile dust collecting device in a textile machine according to claim 1, characterized in that an arc-shaped pull block (15) is fixedly connected to the collecting chamber (14).
4. The textile dust collecting device of a textile machine according to claim 2, wherein a third filter screen (22) is fixedly connected to the bottom end of the collecting chamber (14).
5. The textile dust collecting device of claim 1, wherein said thrust spring (20) is coated with a rust preventive paint.
6. The textile dust collecting device of the textile machine of claim 1, wherein the mesh openings of the first filter (4), the second filter (10) and the third filter (22) are sequentially reduced.
7. A textile dust collecting device in a textile machine according to claim 4, wherein said air inlet (2) is conical.
8. The textile dust collecting device of a textile machine according to claim 1, wherein the collecting chamber (14) is fan-shaped, and only one side of the collecting chamber (14) is open.
9. The textile dust collecting device of the textile machine of claim 4, wherein the diameter of the ball (19) is larger than the diameter of the air vent (18).
CN202010883297.6A 2020-08-28 2020-08-28 Weaving is with weaving quick-witted weaving dust collection device of weaving Pending CN112023584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010883297.6A CN112023584A (en) 2020-08-28 2020-08-28 Weaving is with weaving quick-witted weaving dust collection device of weaving

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010883297.6A CN112023584A (en) 2020-08-28 2020-08-28 Weaving is with weaving quick-witted weaving dust collection device of weaving

Publications (1)

Publication Number Publication Date
CN112023584A true CN112023584A (en) 2020-12-04

Family

ID=73587545

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010883297.6A Pending CN112023584A (en) 2020-08-28 2020-08-28 Weaving is with weaving quick-witted weaving dust collection device of weaving

Country Status (1)

Country Link
CN (1) CN112023584A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150130117A (en) * 2014-05-13 2015-11-23 이진환 Dust collector
CN107268161A (en) * 2017-07-14 2017-10-20 湖州南浔贵丰纺织有限公司 A kind of weaving loom weaving dirt collection device
CN107823984A (en) * 2017-12-01 2018-03-23 芜湖荣基实业有限公司 A kind of weaving loom weaving dirt collection device
CN111359353A (en) * 2020-03-21 2020-07-03 临泉县浪鲨克工贸有限公司 Weaving is with weaving dirt collection device
CN211112479U (en) * 2019-09-28 2020-07-28 嘉兴市瑞佳机械科技有限公司 Weaving machine weaving dirt collection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150130117A (en) * 2014-05-13 2015-11-23 이진환 Dust collector
CN107268161A (en) * 2017-07-14 2017-10-20 湖州南浔贵丰纺织有限公司 A kind of weaving loom weaving dirt collection device
CN107823984A (en) * 2017-12-01 2018-03-23 芜湖荣基实业有限公司 A kind of weaving loom weaving dirt collection device
CN211112479U (en) * 2019-09-28 2020-07-28 嘉兴市瑞佳机械科技有限公司 Weaving machine weaving dirt collection device
CN111359353A (en) * 2020-03-21 2020-07-03 临泉县浪鲨克工贸有限公司 Weaving is with weaving dirt collection device

Similar Documents

Publication Publication Date Title
CN209368559U (en) A kind of device for ribbon cleaning dedusting
CN210832458U (en) Novel efficient filtering air port in purifying equipment
CN214992222U (en) Circular knitting machine removes batting device
CN208786014U (en) A kind of weaving dust removal device with waste recovery function
CN212919652U (en) Processing head with dust collection device of clothing template machine
CN112023584A (en) Weaving is with weaving quick-witted weaving dust collection device of weaving
CN218046927U (en) Chemical fiber cotton spinning processing machine removes dust
CN112934445B (en) Discharging device convenient for collecting tetrachloromethionyl pyridine and using method
CN210560968U (en) Spinning machine with dust collector
CN211772292U (en) Weaving workshop dust collector
CN213061159U (en) Spinning equipment for spinning finishing
CN219342648U (en) Surface cleaning and dedusting device for woven cloth
CN207928919U (en) A kind of furniture process dedusting and purifying device
CN201835040U (en) Automatic cotton suction device of cotton suction chest in spinning frame
CN108854370A (en) A kind of weaving loom dust cleaner
CN221071756U (en) Air-flow type cotton opening and picking device
CN112762595A (en) Novel efficient filtering air port in purifying equipment
CN110523156A (en) A kind of sack cleaner of multi-angle air-supply
CN219089082U (en) Anti-blocking structure of dust collector filter screen
CN213866980U (en) Dust collecting equipment is used in processing of stamp surface fabric
CN216378857U (en) Easy-to-clean textile dust remover
CN214938076U (en) Automatic cleaning type spinning frame
CN212800957U (en) Textile dust removing device on textile fabric
CN220364655U (en) Drawing device
CN214715447U (en) Dust removal device for spun yarn fiber spinning machine

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
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20201204

WD01 Invention patent application deemed withdrawn after publication