CA1142016A - Method and apparatus for collecting process generated fume and/or slag - Google Patents
Method and apparatus for collecting process generated fume and/or slagInfo
- Publication number
- CA1142016A CA1142016A CA000348750A CA348750A CA1142016A CA 1142016 A CA1142016 A CA 1142016A CA 000348750 A CA000348750 A CA 000348750A CA 348750 A CA348750 A CA 348750A CA 1142016 A CA1142016 A CA 1142016A
- Authority
- CA
- Canada
- Prior art keywords
- fume
- slag
- nozzle
- air
- process apparatus
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims abstract description 100
- 239000003517 fume Substances 0.000 title claims abstract description 50
- 239000002893 slag Substances 0.000 title claims abstract description 42
- 239000012809 cooling fluid Substances 0.000 claims abstract description 20
- 239000013618 particulate matter Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 6
- 239000002699 waste material Substances 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims description 29
- 229910052799 carbon Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005204 segregation Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 2
- 239000000112 cooling gas Substances 0.000 claims description 2
- 239000000110 cooling liquid Substances 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 239000002923 metal particle Substances 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims 1
- 238000010891 electric arc Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 10
- 238000003466 welding Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 241001527902 Aratus Species 0.000 description 1
- 101100379067 Caenorhabditis elegans anc-1 gene Proteins 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 environment Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
Classifications
-
- 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
Landscapes
- Arc Welding In General (AREA)
Abstract
233-P-USO2350 METHOD AND APPARATUS FOR COLLECTING PROCESS GENERATED FUME AND/OR SLAG ABSTRACT OF THE DISCLOSURE Method and system for collecting fume and/or waste particulate matter generated in a process used to surface treat, cut, gouge or join a workpiece by means of elevated temperature (e.g. electric arc). The system includes means to collect and quench the effluent (slag and/or fume) in a cooled nozzle coupled with means to separate solid particles and cooling fluid, in the case of working environment including air and return cleansed air to the ambient environment.
Description
i0 A KGROUND OF THE INVENTION
11 1. Field of the Invention 12 This invention pertains to -the field of collec-ting 13 process generated fume and/or waste particulate matter (e.y.
14 slag) generated by a process used to surface treat, cut, gouge or join a workpiece by means of elevated temperature te.g. electric 16 arc).
17 In particular the air-carbon arc cut-ting and gouging 18 process is used to prepare metals for subsequent finishing oper-19 ations such as welding. In th~ air-carbon arc cutting and goug-ing process an electric arc is struck between an electrode and a 21 workpiece to initiate melting of the workpiece under the arc.
22 The molten metal produced by the arc is forcibly removed from the 23 workpiece by a stream of high pressure air. The air-carbon arc 24 cutting and gouginq process generates a large amount of fume 25 , because of the thermochemic~l reactions and produces waste parti-l 26 ! culate material in the form of a metal containing slag. With the' 27'' advent of tighter air pollution control xestrictions ways have 28i been sought to prevent the process genera-ted fume and/or slag , ,. I
,, I
i! . ` . -- .- .
. ~' ,~' j '' '' ' ' , ' ' ' ' .
'', ~.
16 1 ,, 1 fxom being forced into the ambient environment and in particular
11 1. Field of the Invention 12 This invention pertains to -the field of collec-ting 13 process generated fume and/or waste particulate matter (e.y.
14 slag) generated by a process used to surface treat, cut, gouge or join a workpiece by means of elevated temperature te.g. electric 16 arc).
17 In particular the air-carbon arc cut-ting and gouging 18 process is used to prepare metals for subsequent finishing oper-19 ations such as welding. In th~ air-carbon arc cutting and goug-ing process an electric arc is struck between an electrode and a 21 workpiece to initiate melting of the workpiece under the arc.
22 The molten metal produced by the arc is forcibly removed from the 23 workpiece by a stream of high pressure air. The air-carbon arc 24 cutting and gouginq process generates a large amount of fume 25 , because of the thermochemic~l reactions and produces waste parti-l 26 ! culate material in the form of a metal containing slag. With the' 27'' advent of tighter air pollution control xestrictions ways have 28i been sought to prevent the process genera-ted fume and/or slag , ,. I
,, I
i! . ` . -- .- .
. ~' ,~' j '' '' ' ' , ' ' ' ' .
'', ~.
16 1 ,, 1 fxom being forced into the ambient environment and in particular
2 the environment within which the user of the process has to
3 function.
4 2. The Prior Art Fume collectors have been known for some time and are 6 , widely available for use with conventional welding torches.
7 , These devices are associated with a welding torch wherein as the 8 welding proceeds, dense volumes of fume are produced which are 9 forcibly removed by creating a partial vacuum in a sleeve disposed near the nozzle of the torch. The fume is sucked away from the 11 torch head through a conduit and dispcsed of in a safe rn~nner as 12 is well known in the air handling art.
13 Insofar as the air-carbon arc cutting and gouging 14 process is concerned and any other process that would generate funle and/or slag U.S. Patent No. 3,524,038 discloses a device for 16 removing solid particulate matter from the vicinity of the arc.
17 The device of the '038 patent has been available for some time as 18 a hand held tool or a machine mounted tool that must be used in 19 close proximity to an air-carbon arc cuttin~ and gouging torch.
While the device of the '038 patent will remove some process 21 generated fume, it will not provide the type of atmosphere 22 movement to comply with current air pollution requirements.
23 The literature shows that in Japan installations em-24i ploying the Air-Carbon Arc Cutting and Gouging Process have utilized conventional cutting tables with a water bath to collect 26 slag generated by the process. The Japanese have further com-27,i bined the conventional water table with a acoustically lined hood 2Q;¦ to contain fume and to control the noise level of the process in ' 29 il the immediate environment of the process user. This type of 30~l apparatus is not readily portable and requires a fixed installa-. ~ . .
, 3~.~
t~n where the workpiece must be transportecl to theinstallation to be treatecl.
SUMM~RY Ol~ .l'l-IE INV~N'i'ION
. _ In order to provide an improved method and apparatus for maintaining the ambient environment around a process apparatus which generates fume and/or waste partlculate material it was discovered that isolating the area immediately surrounding the process apparatus enables the environment in the isolated area (fume, air or other gas, and particulate matter) to be subjected to processes whereby the particulate matter is removed, the pollutents separated from the ; environmental gas (e.g. air) alld the envirotlmental gas recycled. The invention is achieved through the use of a system arrangement whereby a housing containing means to isolate the environment can be disposed adjacent to the workpiece and moved along with the treating apparatus. The housing is adapted to pos:ition the treating apparatus at the proper angle to tlle workpiece and also to support a nozzle adapted to receive a cooling fluid mixed with air. The fluid cooled noæzle is evacuated continuously thus drawing process generated fume, the isolated environment, and the par~iculate matter through the nozzle and propelling it to a filtering system where the water, environment, fume, and particulate matter can be separated for reuse without po:Lluting the environment.
In one particular aspect the present invention provides a system for collecting fume and/or waste particulate matter generated by process apparatus used to perform cutting, gouging, surEace treatment or joining a workplece which processes generate large volumes of molten metal, slag and/or fume comprising in combinatlon:
a mounting arm adapted for positioning adjacent to a jl/ _3 ~
2~33L~
workpiece upon wtlich the process apparatus i~; to per~or111 an operation;
first means on said mounting arn1 adclpted to recelve the process apparatus and positio~ said process apparatus in relation to said workpiece for facilitating operating of said process apparatus;
second Dleans on saic1 mounting arm to receive and position a noæzle assembly relat:ive to sai.d workpiece so that a mixture of air and a cooling rluicl can be introducecl into 1~ s.1id nozzle to produce je~s convergi1lg along a center line of said noæzle and to cover tlle inside of ~aid nozzle during operation of.said process, said process apparatus and said nozzle assembly juxtaposi.tioned so that ~u111e and/or slag generated by said process apparatus is directed toward said nozzle assembly wherein sa:id air and cooling fluid mixture :in said nozzle assembly break up n1olten metal and/or slag into small pieces while quenchir1g t1~e metal and/or slag and keep collected material in suspension witllout con~paction or segregation;
~0 ~aid proce~s apparatus and said nozzle fixed at an angular relations11.ip to eacll ot11er so ti~at said process app.lratus direcL~; gellcr;lLu(l lunle an(l/or .s.lag into sucl nozz.le; and a pu1np to witlldraw process generated fume, metal particles, slag particles a1ld/or environment containing particulate matter and cooling fluid collected in sa:icl nozzle assembly and direct said material, to a separator to separate s.1id fu111e, collect part:iculate matter and coo.ling fluid and return clean ai.r to the surround.ing environ111ent.
In anotller particular aspect tlle prese1lt :LIlvelltioll provides a system for col:Lecting fume anc1/or sla~ generated by operation of air-carbon arc CUtti11g and goug:L1lg process jl/ -3a-. = == = _ _ __ . ... .
2~6 p aratus conlprising in coml~irlation:
a n~ounting arn~ assembly adapted for positionillg adjacent to a workpiece upon which the a:ir-carbon arc cutting and gouging apparatus is to perEorm an operation;
first means on said mounting arm assembly to position said air-carbon arc cutting and gouging apparatus at an angle to said workpiece;
second means on said mount:ing arm assembly to receive and position a nozzle assembly relating to said process apparatus so that when saicl process aE~paratus is in opera'ion fun~e, molten metal and/or mol.ten slag generated by said cutting and gouging apparatus is directed toward said nozzle for collection inside thereof, said nozzle including means to introduce a cooling fluicl mixed with air in the form of jets converging along the center line of said nozzle said jets of cooling fluid-air mixture serving to keep said generated fume and/or slag in suspension, break up large solid pieces of Dlolten metal and/or molten slag, cool said particles and prevent particl.es adherirlg to the walls of 0 said nozzle assembly;
said pro.cess apparatus and said nozzle Eixed at an allgul..lr re~ati.onsllip to CclCIl oLI~er so tl~aL sa:icl procesx apparatus directs generated ~ume, metal ancl/or slag into said nozzle; and a pump to withdraw process environlllellt containing fume, DletaL and/or slag suspendecl ill said nozzle and cooling flui.d througll said noz~le and clirect said suspension and coo:ling ~`~ S~pa~a+D~
fluid to~tneans to separate ~a:id Lume, coJ.lect slag and cool:ing fluid and return clean air to the alobient environl~ent.
ln a further particular aspect tl)e present lnvent:ioll provicles a method Eor coLJ.e-:~ing lull~e ancl/or .s.l.ag gelloraLed by operatioll of an a-ir-carl)oll arc Cllttillg alld ~OUg:illg appllratus 31~-comprising the steps of:
isolating from the ambient environment an area surrounding the apparatus where fume and/or slag is generated;
continuously withdrawing the atmosphere inside said isolated area through a fluid cooled withdrawal apparatus, the fluid of which is a mixed stream of cooling gas and liquid;
separating said cooling fluid and slag from said atmosphere; and filtering said fume from said atmosphere.
DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 is a schematic diagram illustrating the method and one system employing the method according to the present invention.
Figure 2 is a front elevational view of an apparatus according to the present invention. ~~
Figure 3 is a bottom plan view of the apparatus of Figure 2.
Figure 4 is an elevational view-of the nozzle according to the present invention.
Figure 5 is a front elevational view of the nozzle of Figure 4.
DETAILED DESCRIPTION OF THE PREF_ RED EMBODIMENT
The present invention will be described in relation to the air-carbon arc cutting and gouging process as it was first disclosed in U.S. Patent No. 2,706,236. This patent discloses the method which resides in providing an electrode so that an electric arc can be struck between the electrode and a workpiece to cause portions of the workpiece to melt under the influence of the electric arc. Simultaneously~ as the arc causes the metal to ., ., il ., ,~ ~
~ J~LV
1 , melt a stream of high pressure air is forced along the electrode 2 to forcibly remove -the molten metal from under the influence o~
3 the arc. In this manner the process can be utilized to remove 4 surface defects or sever complete portions of a workpiece.
S An improved hand operated air-carbon arc cutting and 6 gouging torch is disclosed in U.S. Patent No. 3,573,419. The 7 air-carbon arc cutting and gouging process has been automated and 8 one type automatic torch is disclosed in U.S. Patent No. 3,317,779.
9 U.S. Patent No. 3,559,071 discloses an improvement of the auto-lU matic torch of the '779 patent.
11 - Referring now to the drawing, Figure 1, discloses a 12 workpiece 10 shown to be a cylinder. The workpiece can be any 13 convenient shape and can be mounted for rotation about an axis as 14 in the case of a cylindrical bar, tube, extrusion or the like.
Assuming the workpiece has significant surface defects and that a 16 portion of the surface is to be removed by the air-carbon arc 17 cutting and gouging process the workpiece can be rotated and the 18 air-carbon arc cutting and gouging apparatus shown schematically 19 as 12 can be positioned so that electrode 14 can be utilized to strike an arc with the workpiece 10. High pressure air can be 21 forced longitudinally along the electrode by means of a remote 22 source of air (not shown). The process then can continue until 23 the surface of the workpiece 10 is cleaned and free of defects.
24 As set out above during the operation of the air-carbon arc cutting and gouging process molten metal is produced which is 26 forcibly removed from the arc. In -the case of the apparatus 27 shown schematically in Figure 1, assuming the workpiece is ro-tat-28 ' .in~ cvunterclockwise the molten metal would be forced toward tlle 29il hottom of the Figure and copious amounts of fume would be generat 30~ ed which ~ould flood the immediate area of the torch 12 and the .i 1 , - 5 ~ .
z~6 1 surrounding ambient enviromnent, thus exposing an operator to ~he 2 fume and particulate matter generated by the process.
3 In order to eliminate this hazard a housing shown generally 4 as 16 containing a mounting arm 18 and a collecting hood 20 is positioned adjacent the workpiece 10 opposite to the process 6 ; apparatus or tool (torch) 12. Mounting arm 18 is utilized to fix 7 housing 16 to the torch support ~not shown) or other fixed 8 support so that hood 20 can be properly positioned vis-a~vis the g workpiece 10. Hood 20 includes means for holding the process apparatus 12 (e.g. air-carbon arc cutting and gouging torch) in 11 the proper posi-tion to achieve its intended result of vis-a vis 12 the workpiece 10. Disposed opposite -to the torch 12 and also 13 held by hood 20 is a slag and fume collection apparatus 22. Hood 14 20 is preferably lined with an acoustical absorbing material to reduce process noise in the surrounding area. Hood 20 includes 16 viewing ports 23 so that the process can be observed. The 17 apparatus 22 includes a nozzle assembly 24 as will hereinafter be la more fully described and a collection tube 26. Associa-ted with 19 the nozzle assembly 24 is a conduit 28 for admitting cooling fluid and air to the nozzle assembly 24. Collection tube 26 is 21 connected by a conduit to an air pump 29 and through further 22 conduit to A filtering system 30. The filteriQg system includes 23 a reservoir 32 adapted to receive a ~uantity of cooling fluid.
24 In the upper part of filter system 30 there is included a particu-i late filter 3~ between the reservoir 32 and an air mover 36. Air 26 mover 36 is adapted to evacuate filtering sys-tem 30 and dispose 27 , of a cleaned gas as shown by arrow 38. The cleaned gas 38, in 28 ! the case of air, can be put back into the ambient environment.
29 '~ In the case of a gas such as an inert gas used to surround the 30 ! process apparatus this gas can be returned for reuse in ~l l 2~
1 association with the process. ~eservoir 32 includes a suitable 2 drain and valve arrangemen-t ~0 to remove fluid from reservoir 32.
3 ~ithdrawal flow in this system is shown by the continuous arrow 4 42 wllich contin~les on throu~h the filter system.
The hood 20 can include a flexible curtain 21 fixed to 6 the lower periphery of a hood 20 to provide a flexible seal 7 between the workpiece and the hood 20 to minimize escape of the 8 atmosphere surrounding the process apparatus or tool (e.g. torch 9 12).
In operation the workpiece lO is subjected to the 11 process apparatus and as the fume and solid particula-te matter 12 are generated they are forced by a combination of the process air 13 (in the case of the air-carbon arc cutting process) and the air 14 pump to be withdrawn into -the collection apparatus 22 (Figure 2).
Water and air introduced into noz~le assembly 24 cools any partic-16 ulate matter that is at elevated temperature and thus prevents 17 sticking of the particulate matter to the nozzle assembly.
18 Because of the air pump 29 the collec-ted fume, environment sur-19 rounding the process appara-tus, particulate matter, and cooling fluid are withdrawn into the filtering system 30. In the filtering 21 system 30 the wa-ter falls to the bottom and is collected in the 22 reservoir for draining and safe disposal. The water can be 23 sl~jec-t to further cleaning if necessary. The solid particulate 24 matter settles to the bottom of the filter system 30 and is periodically cleaned from the system. The process gas (e.g. air) 26 is directed toward the vacuum pump 36 and upon passing through 27 the filter is cleaned of airborne particulate matter. The cleaned 28 I process gas is then removed from filtering system 30 through the 29 I.fllter 3~ (arrow 38) and either placed in the environment or returned ~o the process apparatus for reuse.
., ' .
' , ~ ` ` ` ~4~ 6 Figure 2 is an enlarged view of t~e collection apparatus 16. As part of the col:Lection apparatus 16 the process apparatus e.g. automatic air-carbon arc cutting and gouging torch 12' is placed in the hood 20 so that the electrode 14 is positioned at the right angle to the workpiece 10. Air-carbon arc cutting and gouging torch 12' includes the necessary apparatus to automatically feed the electrode to the workpiece as it is consumed. The hood 20 includes a pair of resilient wheels 50,52 mounted on either side through suitable spring loaded slide mechanisms 54,56 so that the hood 20 can move along the surface of the workpiece 10. Flexible curtain 21 is provided so that process fume does not escape to the surrounding atmosphere.
Figures 4 and 5 show the nozzle assembly 24 which includes a jacketed assembly containing a plurality of holes or apertures 60 around the periphery of the inner wall 62 so that a cooling fluid (e.g. water and air) in conduit 28 will flow through the water jacket defined by the inner and outer shell 64,66 to the aperture 60 and be directed to the inside of the nozzle~assembly 24. Apertures 60 are so constructed and arranged so that high pressure air and water jets converge at the center of the collector nozæle along its longitudinal axis and to direct (propel) the collected environment, fume and particulate matter to the filtering system 30 as shown by the arrows of Figures 4 and 5. The high pressure air and water break up molten slag and particulate matter into small pieces while quenching the slag. The water and air stream keeps all the collected material in suspension for movement to the filtering system 30 without compaction or segregation in system conduits or sticking on the walls of the system. The air and water continuously wets the inner surface of nozzle assembly 24 to cool the nozzle and prevent molten metal from sticking to 1 its inner sllrface...Thus, a water bath i~ ereated inside the 2 noz~le assembly ~4 so that hot gases and particulate matte;r 3 forced into the nozzle assembly 24 where the particulate mattex is broken up and held in .suspension and the suspension is cooled and will not stick to the inner wall 62 of the nozæle a~sembly 6 and can be readily conducted into the filter system 30 (Figu~e 7 1). -8 In the event that it is desireable to mimimi~e the 9 operating noise associated with the air-carbon arc cutting and gouging process or any other process for which the apparatus and 11 the invention is used, the collection assembly 16 can be surround-12 ed with a cover lined with a sound absorbing material which 13 contains a viewing port so that the process apparatus can be 14 ¦ observed during opera-tion. Such a cover can be readily con-structed and need not seal against the workpiece in order to 16 ¦ achieve a significant reduction in the operating noise level of 17 ¦ the process apparatus.
18 ¦ It is been found that the angle of the process device 19 I can be between 20 and 90 to the point of contact with the workpiece in order to achieve effective colleetion of the fume 21 ¦ and particulate matter generated by the process.
~2 ¦ ~len using the slag and/or fwne apparatus according to 23 ¦ the presen-t invention with the air-carbon are eutting and gouging ~4 I proeess the apparatus can be adapted for use in a stationary pos-25 ¦ ition while the workpiece is moved by suitable means in a straight 26 ¦ line, circular motion or a cu.~ilinear motion. The collection 27 I apparatus can be construc-tecl for movement while the workpiece 28 ¦ remains s-tationary by affi~ing the apparatus to a carriage or to 29 I a like structure CarryincJ the air-carbon arc cutting and gouginq 30 ¦ torch. The apparatus is adaptable for all positions of gouging 31 I and/or cu-tti.ng such as in Lhe Elat or do~m hand position, in the t,.~
1 verfical up or ver~ical down positlon, in the horizontal position, 2 and in the over hand position. Lastly, the apparatus can be used 3 in combinations wi~h motion and position which reguire automatic 4 control of the collectors, gouging electrode and gouging air jets.
6 ~aving thus described our invention what is desired to 7 be secured by letters patent ~ n- ~ ' ` - is set forth in 8 I the appende claims.
.
7 , These devices are associated with a welding torch wherein as the 8 welding proceeds, dense volumes of fume are produced which are 9 forcibly removed by creating a partial vacuum in a sleeve disposed near the nozzle of the torch. The fume is sucked away from the 11 torch head through a conduit and dispcsed of in a safe rn~nner as 12 is well known in the air handling art.
13 Insofar as the air-carbon arc cutting and gouging 14 process is concerned and any other process that would generate funle and/or slag U.S. Patent No. 3,524,038 discloses a device for 16 removing solid particulate matter from the vicinity of the arc.
17 The device of the '038 patent has been available for some time as 18 a hand held tool or a machine mounted tool that must be used in 19 close proximity to an air-carbon arc cuttin~ and gouging torch.
While the device of the '038 patent will remove some process 21 generated fume, it will not provide the type of atmosphere 22 movement to comply with current air pollution requirements.
23 The literature shows that in Japan installations em-24i ploying the Air-Carbon Arc Cutting and Gouging Process have utilized conventional cutting tables with a water bath to collect 26 slag generated by the process. The Japanese have further com-27,i bined the conventional water table with a acoustically lined hood 2Q;¦ to contain fume and to control the noise level of the process in ' 29 il the immediate environment of the process user. This type of 30~l apparatus is not readily portable and requires a fixed installa-. ~ . .
, 3~.~
t~n where the workpiece must be transportecl to theinstallation to be treatecl.
SUMM~RY Ol~ .l'l-IE INV~N'i'ION
. _ In order to provide an improved method and apparatus for maintaining the ambient environment around a process apparatus which generates fume and/or waste partlculate material it was discovered that isolating the area immediately surrounding the process apparatus enables the environment in the isolated area (fume, air or other gas, and particulate matter) to be subjected to processes whereby the particulate matter is removed, the pollutents separated from the ; environmental gas (e.g. air) alld the envirotlmental gas recycled. The invention is achieved through the use of a system arrangement whereby a housing containing means to isolate the environment can be disposed adjacent to the workpiece and moved along with the treating apparatus. The housing is adapted to pos:ition the treating apparatus at the proper angle to tlle workpiece and also to support a nozzle adapted to receive a cooling fluid mixed with air. The fluid cooled noæzle is evacuated continuously thus drawing process generated fume, the isolated environment, and the par~iculate matter through the nozzle and propelling it to a filtering system where the water, environment, fume, and particulate matter can be separated for reuse without po:Lluting the environment.
In one particular aspect the present invention provides a system for collecting fume and/or waste particulate matter generated by process apparatus used to perform cutting, gouging, surEace treatment or joining a workplece which processes generate large volumes of molten metal, slag and/or fume comprising in combinatlon:
a mounting arm adapted for positioning adjacent to a jl/ _3 ~
2~33L~
workpiece upon wtlich the process apparatus i~; to per~or111 an operation;
first means on said mounting arn1 adclpted to recelve the process apparatus and positio~ said process apparatus in relation to said workpiece for facilitating operating of said process apparatus;
second Dleans on saic1 mounting arm to receive and position a noæzle assembly relat:ive to sai.d workpiece so that a mixture of air and a cooling rluicl can be introducecl into 1~ s.1id nozzle to produce je~s convergi1lg along a center line of said noæzle and to cover tlle inside of ~aid nozzle during operation of.said process, said process apparatus and said nozzle assembly juxtaposi.tioned so that ~u111e and/or slag generated by said process apparatus is directed toward said nozzle assembly wherein sa:id air and cooling fluid mixture :in said nozzle assembly break up n1olten metal and/or slag into small pieces while quenchir1g t1~e metal and/or slag and keep collected material in suspension witllout con~paction or segregation;
~0 ~aid proce~s apparatus and said nozzle fixed at an angular relations11.ip to eacll ot11er so ti~at said process app.lratus direcL~; gellcr;lLu(l lunle an(l/or .s.lag into sucl nozz.le; and a pu1np to witlldraw process generated fume, metal particles, slag particles a1ld/or environment containing particulate matter and cooling fluid collected in sa:icl nozzle assembly and direct said material, to a separator to separate s.1id fu111e, collect part:iculate matter and coo.ling fluid and return clean ai.r to the surround.ing environ111ent.
In anotller particular aspect tlle prese1lt :LIlvelltioll provides a system for col:Lecting fume anc1/or sla~ generated by operation of air-carbon arc CUtti11g and goug:L1lg process jl/ -3a-. = == = _ _ __ . ... .
2~6 p aratus conlprising in coml~irlation:
a n~ounting arn~ assembly adapted for positionillg adjacent to a workpiece upon which the a:ir-carbon arc cutting and gouging apparatus is to perEorm an operation;
first means on said mounting arm assembly to position said air-carbon arc cutting and gouging apparatus at an angle to said workpiece;
second means on said mount:ing arm assembly to receive and position a nozzle assembly relating to said process apparatus so that when saicl process aE~paratus is in opera'ion fun~e, molten metal and/or mol.ten slag generated by said cutting and gouging apparatus is directed toward said nozzle for collection inside thereof, said nozzle including means to introduce a cooling fluicl mixed with air in the form of jets converging along the center line of said nozzle said jets of cooling fluid-air mixture serving to keep said generated fume and/or slag in suspension, break up large solid pieces of Dlolten metal and/or molten slag, cool said particles and prevent particl.es adherirlg to the walls of 0 said nozzle assembly;
said pro.cess apparatus and said nozzle Eixed at an allgul..lr re~ati.onsllip to CclCIl oLI~er so tl~aL sa:icl procesx apparatus directs generated ~ume, metal ancl/or slag into said nozzle; and a pump to withdraw process environlllellt containing fume, DletaL and/or slag suspendecl ill said nozzle and cooling flui.d througll said noz~le and clirect said suspension and coo:ling ~`~ S~pa~a+D~
fluid to~tneans to separate ~a:id Lume, coJ.lect slag and cool:ing fluid and return clean air to the alobient environl~ent.
ln a further particular aspect tl)e present lnvent:ioll provicles a method Eor coLJ.e-:~ing lull~e ancl/or .s.l.ag gelloraLed by operatioll of an a-ir-carl)oll arc Cllttillg alld ~OUg:illg appllratus 31~-comprising the steps of:
isolating from the ambient environment an area surrounding the apparatus where fume and/or slag is generated;
continuously withdrawing the atmosphere inside said isolated area through a fluid cooled withdrawal apparatus, the fluid of which is a mixed stream of cooling gas and liquid;
separating said cooling fluid and slag from said atmosphere; and filtering said fume from said atmosphere.
DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 is a schematic diagram illustrating the method and one system employing the method according to the present invention.
Figure 2 is a front elevational view of an apparatus according to the present invention. ~~
Figure 3 is a bottom plan view of the apparatus of Figure 2.
Figure 4 is an elevational view-of the nozzle according to the present invention.
Figure 5 is a front elevational view of the nozzle of Figure 4.
DETAILED DESCRIPTION OF THE PREF_ RED EMBODIMENT
The present invention will be described in relation to the air-carbon arc cutting and gouging process as it was first disclosed in U.S. Patent No. 2,706,236. This patent discloses the method which resides in providing an electrode so that an electric arc can be struck between the electrode and a workpiece to cause portions of the workpiece to melt under the influence of the electric arc. Simultaneously~ as the arc causes the metal to ., ., il ., ,~ ~
~ J~LV
1 , melt a stream of high pressure air is forced along the electrode 2 to forcibly remove -the molten metal from under the influence o~
3 the arc. In this manner the process can be utilized to remove 4 surface defects or sever complete portions of a workpiece.
S An improved hand operated air-carbon arc cutting and 6 gouging torch is disclosed in U.S. Patent No. 3,573,419. The 7 air-carbon arc cutting and gouging process has been automated and 8 one type automatic torch is disclosed in U.S. Patent No. 3,317,779.
9 U.S. Patent No. 3,559,071 discloses an improvement of the auto-lU matic torch of the '779 patent.
11 - Referring now to the drawing, Figure 1, discloses a 12 workpiece 10 shown to be a cylinder. The workpiece can be any 13 convenient shape and can be mounted for rotation about an axis as 14 in the case of a cylindrical bar, tube, extrusion or the like.
Assuming the workpiece has significant surface defects and that a 16 portion of the surface is to be removed by the air-carbon arc 17 cutting and gouging process the workpiece can be rotated and the 18 air-carbon arc cutting and gouging apparatus shown schematically 19 as 12 can be positioned so that electrode 14 can be utilized to strike an arc with the workpiece 10. High pressure air can be 21 forced longitudinally along the electrode by means of a remote 22 source of air (not shown). The process then can continue until 23 the surface of the workpiece 10 is cleaned and free of defects.
24 As set out above during the operation of the air-carbon arc cutting and gouging process molten metal is produced which is 26 forcibly removed from the arc. In -the case of the apparatus 27 shown schematically in Figure 1, assuming the workpiece is ro-tat-28 ' .in~ cvunterclockwise the molten metal would be forced toward tlle 29il hottom of the Figure and copious amounts of fume would be generat 30~ ed which ~ould flood the immediate area of the torch 12 and the .i 1 , - 5 ~ .
z~6 1 surrounding ambient enviromnent, thus exposing an operator to ~he 2 fume and particulate matter generated by the process.
3 In order to eliminate this hazard a housing shown generally 4 as 16 containing a mounting arm 18 and a collecting hood 20 is positioned adjacent the workpiece 10 opposite to the process 6 ; apparatus or tool (torch) 12. Mounting arm 18 is utilized to fix 7 housing 16 to the torch support ~not shown) or other fixed 8 support so that hood 20 can be properly positioned vis-a~vis the g workpiece 10. Hood 20 includes means for holding the process apparatus 12 (e.g. air-carbon arc cutting and gouging torch) in 11 the proper posi-tion to achieve its intended result of vis-a vis 12 the workpiece 10. Disposed opposite -to the torch 12 and also 13 held by hood 20 is a slag and fume collection apparatus 22. Hood 14 20 is preferably lined with an acoustical absorbing material to reduce process noise in the surrounding area. Hood 20 includes 16 viewing ports 23 so that the process can be observed. The 17 apparatus 22 includes a nozzle assembly 24 as will hereinafter be la more fully described and a collection tube 26. Associa-ted with 19 the nozzle assembly 24 is a conduit 28 for admitting cooling fluid and air to the nozzle assembly 24. Collection tube 26 is 21 connected by a conduit to an air pump 29 and through further 22 conduit to A filtering system 30. The filteriQg system includes 23 a reservoir 32 adapted to receive a ~uantity of cooling fluid.
24 In the upper part of filter system 30 there is included a particu-i late filter 3~ between the reservoir 32 and an air mover 36. Air 26 mover 36 is adapted to evacuate filtering sys-tem 30 and dispose 27 , of a cleaned gas as shown by arrow 38. The cleaned gas 38, in 28 ! the case of air, can be put back into the ambient environment.
29 '~ In the case of a gas such as an inert gas used to surround the 30 ! process apparatus this gas can be returned for reuse in ~l l 2~
1 association with the process. ~eservoir 32 includes a suitable 2 drain and valve arrangemen-t ~0 to remove fluid from reservoir 32.
3 ~ithdrawal flow in this system is shown by the continuous arrow 4 42 wllich contin~les on throu~h the filter system.
The hood 20 can include a flexible curtain 21 fixed to 6 the lower periphery of a hood 20 to provide a flexible seal 7 between the workpiece and the hood 20 to minimize escape of the 8 atmosphere surrounding the process apparatus or tool (e.g. torch 9 12).
In operation the workpiece lO is subjected to the 11 process apparatus and as the fume and solid particula-te matter 12 are generated they are forced by a combination of the process air 13 (in the case of the air-carbon arc cutting process) and the air 14 pump to be withdrawn into -the collection apparatus 22 (Figure 2).
Water and air introduced into noz~le assembly 24 cools any partic-16 ulate matter that is at elevated temperature and thus prevents 17 sticking of the particulate matter to the nozzle assembly.
18 Because of the air pump 29 the collec-ted fume, environment sur-19 rounding the process appara-tus, particulate matter, and cooling fluid are withdrawn into the filtering system 30. In the filtering 21 system 30 the wa-ter falls to the bottom and is collected in the 22 reservoir for draining and safe disposal. The water can be 23 sl~jec-t to further cleaning if necessary. The solid particulate 24 matter settles to the bottom of the filter system 30 and is periodically cleaned from the system. The process gas (e.g. air) 26 is directed toward the vacuum pump 36 and upon passing through 27 the filter is cleaned of airborne particulate matter. The cleaned 28 I process gas is then removed from filtering system 30 through the 29 I.fllter 3~ (arrow 38) and either placed in the environment or returned ~o the process apparatus for reuse.
., ' .
' , ~ ` ` ` ~4~ 6 Figure 2 is an enlarged view of t~e collection apparatus 16. As part of the col:Lection apparatus 16 the process apparatus e.g. automatic air-carbon arc cutting and gouging torch 12' is placed in the hood 20 so that the electrode 14 is positioned at the right angle to the workpiece 10. Air-carbon arc cutting and gouging torch 12' includes the necessary apparatus to automatically feed the electrode to the workpiece as it is consumed. The hood 20 includes a pair of resilient wheels 50,52 mounted on either side through suitable spring loaded slide mechanisms 54,56 so that the hood 20 can move along the surface of the workpiece 10. Flexible curtain 21 is provided so that process fume does not escape to the surrounding atmosphere.
Figures 4 and 5 show the nozzle assembly 24 which includes a jacketed assembly containing a plurality of holes or apertures 60 around the periphery of the inner wall 62 so that a cooling fluid (e.g. water and air) in conduit 28 will flow through the water jacket defined by the inner and outer shell 64,66 to the aperture 60 and be directed to the inside of the nozzle~assembly 24. Apertures 60 are so constructed and arranged so that high pressure air and water jets converge at the center of the collector nozæle along its longitudinal axis and to direct (propel) the collected environment, fume and particulate matter to the filtering system 30 as shown by the arrows of Figures 4 and 5. The high pressure air and water break up molten slag and particulate matter into small pieces while quenching the slag. The water and air stream keeps all the collected material in suspension for movement to the filtering system 30 without compaction or segregation in system conduits or sticking on the walls of the system. The air and water continuously wets the inner surface of nozzle assembly 24 to cool the nozzle and prevent molten metal from sticking to 1 its inner sllrface...Thus, a water bath i~ ereated inside the 2 noz~le assembly ~4 so that hot gases and particulate matte;r 3 forced into the nozzle assembly 24 where the particulate mattex is broken up and held in .suspension and the suspension is cooled and will not stick to the inner wall 62 of the nozæle a~sembly 6 and can be readily conducted into the filter system 30 (Figu~e 7 1). -8 In the event that it is desireable to mimimi~e the 9 operating noise associated with the air-carbon arc cutting and gouging process or any other process for which the apparatus and 11 the invention is used, the collection assembly 16 can be surround-12 ed with a cover lined with a sound absorbing material which 13 contains a viewing port so that the process apparatus can be 14 ¦ observed during opera-tion. Such a cover can be readily con-structed and need not seal against the workpiece in order to 16 ¦ achieve a significant reduction in the operating noise level of 17 ¦ the process apparatus.
18 ¦ It is been found that the angle of the process device 19 I can be between 20 and 90 to the point of contact with the workpiece in order to achieve effective colleetion of the fume 21 ¦ and particulate matter generated by the process.
~2 ¦ ~len using the slag and/or fwne apparatus according to 23 ¦ the presen-t invention with the air-carbon are eutting and gouging ~4 I proeess the apparatus can be adapted for use in a stationary pos-25 ¦ ition while the workpiece is moved by suitable means in a straight 26 ¦ line, circular motion or a cu.~ilinear motion. The collection 27 I apparatus can be construc-tecl for movement while the workpiece 28 ¦ remains s-tationary by affi~ing the apparatus to a carriage or to 29 I a like structure CarryincJ the air-carbon arc cutting and gouginq 30 ¦ torch. The apparatus is adaptable for all positions of gouging 31 I and/or cu-tti.ng such as in Lhe Elat or do~m hand position, in the t,.~
1 verfical up or ver~ical down positlon, in the horizontal position, 2 and in the over hand position. Lastly, the apparatus can be used 3 in combinations wi~h motion and position which reguire automatic 4 control of the collectors, gouging electrode and gouging air jets.
6 ~aving thus described our invention what is desired to 7 be secured by letters patent ~ n- ~ ' ` - is set forth in 8 I the appende claims.
.
Claims (12)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A system for collecting fume and/or waste particulate mutter generated by process apparatus used to perform cutting, gouging, surface treatment or joining a workpiece which processes generate large volumes of molten metal, slag and/or fume comprising in combination:
a mounting arm adapted for positioning adjacent to a workpiece upon which the process apparatus is to perform an operation;
first means on said mounting arm adapted to receive the process apparatus and position said process apparatus in relation to said workpiece for facilitating operating of said process apparatus;
second means on said mounting arm to receive and position a nozzle assembly relative to said workpiece so that a mixture of air and a cooling fluid can be introduced into said nozzle to produce jets con-verging along a center line of said nozzle and to cover the inside of said nozzle during operation or said process, said process apparatus and said nozzle assembly juxtapositioned so that fume and/or slag generated by said process apparatus is directed toward said nozzle assembly wherein said air and cooling fluid mixture in said nozzle assembly break up molten metal and/or slag into small pieces while quenching the metal and/or slag and keep collected material in suspension without compaction or segregation;
said process apparatus and said nozzle fixed at an angular relation-ship to each other so that said process apparatus directs generated fume and/or slag into such nozzle; and a pump to withdraw process generated fume, metal particles, slag particles and/or environment containing particulate matter and cooling fluid collected in said nozzle assembly and direct said material, to a separator to separate said fume, collect particulate matter and cooling fluid and return clean air to the surrounding environment.
a mounting arm adapted for positioning adjacent to a workpiece upon which the process apparatus is to perform an operation;
first means on said mounting arm adapted to receive the process apparatus and position said process apparatus in relation to said workpiece for facilitating operating of said process apparatus;
second means on said mounting arm to receive and position a nozzle assembly relative to said workpiece so that a mixture of air and a cooling fluid can be introduced into said nozzle to produce jets con-verging along a center line of said nozzle and to cover the inside of said nozzle during operation or said process, said process apparatus and said nozzle assembly juxtapositioned so that fume and/or slag generated by said process apparatus is directed toward said nozzle assembly wherein said air and cooling fluid mixture in said nozzle assembly break up molten metal and/or slag into small pieces while quenching the metal and/or slag and keep collected material in suspension without compaction or segregation;
said process apparatus and said nozzle fixed at an angular relation-ship to each other so that said process apparatus directs generated fume and/or slag into such nozzle; and a pump to withdraw process generated fume, metal particles, slag particles and/or environment containing particulate matter and cooling fluid collected in said nozzle assembly and direct said material, to a separator to separate said fume, collect particulate matter and cooling fluid and return clean air to the surrounding environment.
2. A system according to Claim 1 wherein there is included a housing surrounding said first and second means, said housing includes a fume seal adapted to engage said workpiece in an area surrounding said process apparatus and said nozzle.
3. A system according to Claim 1 wherein said process apparatus includes an air-carbon arc cutting and gouging torch.
4. A system according to Claim 2 wherein said housing includes a sound absorbing lining and access ports for viewing said process apparatus in operation.
5. A system according to Claim 1 wherein said separator includes a filtering system containing means to collect said cooling fluid, means to filter said air and means to create a partial vacuum in said filtering system whereby said air is filtered and returned to the ambient atmosphere.
6. A system for collecting fume and/or slag generated by operation of air-carbon are cutting and gouging process apparatus comprising in combination:
a mounting arm assembly adapted for positioning adjacent to a workpiece upon which the air-carbon arc cutting and gouging apparatus is to perform an operation;
first means on said mounting arm assembly to position said air-carbon are cutting and gouging apparatus at an angle to said workpiece;
second means on said mounting arm assembly to receive and position a nozzle assembly relating to said process apparatus so that when said process apparatus is in operation fume, molten metal and/or molten slag generated by said cutting and gouging apparatus is directed toward said nozzle for collection inside thereof, said nozzle including means to introduce a cooling fluid mixed with air in the form of jets converging along the center line of said nozzle said jets of cooling fluid-air mixture serving to to keep said generated fume and/or slag in suspension, break up large solid pieces of molten metal and/or molten slag, cool said particles and prevent particles adhering to the walls of said nozzle assembly;
said process apparatus and said nozzle fixed at an angular relationship to each other so that said process apparatus directs generated fume, metal and/or slag into said nozzle; and a pump to withdraw process environment containing fume, metal and/or slag suspended in said nozzle and cooling fluid through said nozzle and direct said suspension and cooling fluid to separator means to separate said fume, collect slag and cooling fluid and return clean air to the ambient environment.
a mounting arm assembly adapted for positioning adjacent to a workpiece upon which the air-carbon arc cutting and gouging apparatus is to perform an operation;
first means on said mounting arm assembly to position said air-carbon are cutting and gouging apparatus at an angle to said workpiece;
second means on said mounting arm assembly to receive and position a nozzle assembly relating to said process apparatus so that when said process apparatus is in operation fume, molten metal and/or molten slag generated by said cutting and gouging apparatus is directed toward said nozzle for collection inside thereof, said nozzle including means to introduce a cooling fluid mixed with air in the form of jets converging along the center line of said nozzle said jets of cooling fluid-air mixture serving to to keep said generated fume and/or slag in suspension, break up large solid pieces of molten metal and/or molten slag, cool said particles and prevent particles adhering to the walls of said nozzle assembly;
said process apparatus and said nozzle fixed at an angular relationship to each other so that said process apparatus directs generated fume, metal and/or slag into said nozzle; and a pump to withdraw process environment containing fume, metal and/or slag suspended in said nozzle and cooling fluid through said nozzle and direct said suspension and cooling fluid to separator means to separate said fume, collect slag and cooling fluid and return clean air to the ambient environment.
7. A system according to Claim 6 wherein there is included a housing surrounding said process apparatus and said nozzle including a fume seal adapted to engage said workpiece in an area surrounding said process apparatus and said nozzle.
8. A system according to Claim 7 wherein said housing includes a sound absorbing lining and access ports for viewing said process apparatus in operation.
9. A system according to Claim 6 wherein said separator means include a filtering system containing means to collect said cooling fluid, means to filter said air and means to create a partial vacuum in said filtering system whereby said air is filtered and returned to the ambient atmosphere.
10. A method for collecting fume and/or slag generated by operation of an air-carbon arc cutting and gouging apparatus comprising the steps of:
isolating from the ambient environment an area surrounding the apparatus where fume and/or slag is generated;
continuously withdrawing the atmosphere inside said isolated area through a fluid cooled withdrawal apparatus, the fluid of which is a mixed stream of cooling gas and liquid;
separating said cooling fluid and slag from said atmosphere; and filtering said fume from said atmosphere.
isolating from the ambient environment an area surrounding the apparatus where fume and/or slag is generated;
continuously withdrawing the atmosphere inside said isolated area through a fluid cooled withdrawal apparatus, the fluid of which is a mixed stream of cooling gas and liquid;
separating said cooling fluid and slag from said atmosphere; and filtering said fume from said atmosphere.
11. A method according to Claim 10 wherein said atmosphere cleaned of fume, fluid and slag is returned to the ambient environment.
12. A method according to Claim 10 wherein said isolating step takes place in an environment adapted to absorb process generated noise.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2532079A | 1979-03-30 | 1979-03-30 | |
| US025,320 | 1979-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1142016A true CA1142016A (en) | 1983-03-01 |
Family
ID=21825344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000348750A Expired CA1142016A (en) | 1979-03-30 | 1980-03-28 | Method and apparatus for collecting process generated fume and/or slag |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0017442B1 (en) |
| AU (1) | AU5698080A (en) |
| CA (1) | CA1142016A (en) |
| DE (1) | DE3060324D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104769366A (en) * | 2012-09-14 | 2015-07-08 | 英格索尔-兰德公司 | ventilation device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6384372B1 (en) | 2000-07-20 | 2002-05-07 | Advanced Micro Devices, Inc. | Method and system for dust and fume removal in laser marking machines |
| CN102962234A (en) * | 2012-12-05 | 2013-03-13 | 南通亨特电器有限公司 | Novel slag removing device |
| CN109092798A (en) * | 2018-08-19 | 2018-12-28 | 国胜科技（惠州）有限公司 | A kind of industrial machinery dust low noise collector |
| CN110639924A (en) * | 2019-09-29 | 2020-01-03 | 浙江海洋大学 | A kind of slag cleaning device for civil engineering |
| CN110977233A (en) * | 2020-01-08 | 2020-04-10 | 长治市三耐铸业有限公司 | Roller sleeve welding machine |
| CN117620576B (en) * | 2024-01-11 | 2025-12-05 | 丹阳市新联汽车配件有限公司 | A multi-specification adaptive welding workbench |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2210370A (en) * | 1938-08-02 | 1940-08-06 | Herradora Juan Rafael | Portable protective chamber for arc welders |
| US3100255A (en) * | 1961-10-09 | 1963-08-06 | Miller Jack | Method for air carbon-arc cutting or gouging |
| SE396567C (en) * | 1975-08-07 | 1979-12-27 | Lindkvist Konsultbyra Ab A | DEVICE FOR DISPOSAL OF GAS CUTTING AND SIMILAR PREPARING POLLUTANTS |
| FR2363381A1 (en) * | 1976-09-07 | 1978-03-31 | Feurs Fonderies Acieries Elect | Collector for grinding dust etc. - with large dust particles drawn into container and small particles filtered through water |
-
1980
- 1980-03-28 CA CA000348750A patent/CA1142016A/en not_active Expired
- 1980-03-28 DE DE8080300979T patent/DE3060324D1/en not_active Expired
- 1980-03-28 EP EP19800300979 patent/EP0017442B1/en not_active Expired
- 1980-03-31 AU AU56980/80A patent/AU5698080A/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104769366A (en) * | 2012-09-14 | 2015-07-08 | 英格索尔-兰德公司 | ventilation device |
| CN104769366B (en) * | 2012-09-14 | 2018-03-23 | 英格索尔-兰德公司 | ventilation device |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0017442B1 (en) | 1982-04-28 |
| DE3060324D1 (en) | 1982-06-09 |
| AU5698080A (en) | 1980-10-02 |
| EP0017442A1 (en) | 1980-10-15 |
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