EP0136983A2 - Device to collect and dump the smoke and dust which are generated during a scarfing operation of slabs - Google Patents
Device to collect and dump the smoke and dust which are generated during a scarfing operation of slabs Download PDFInfo
- Publication number
- EP0136983A2 EP0136983A2 EP84830227A EP84830227A EP0136983A2 EP 0136983 A2 EP0136983 A2 EP 0136983A2 EP 84830227 A EP84830227 A EP 84830227A EP 84830227 A EP84830227 A EP 84830227A EP 0136983 A2 EP0136983 A2 EP 0136983A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- tunnel
- scarfing
- smoke
- slabs
- retractable
- 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.)
- Granted
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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
Definitions
- the present invention refers to a device to collect and dump the smoke and dust generated during a scarfing operation of slabs.
- such scarfing operation is carried out by sliding the scarfing head described above, along two rails located on the sides of a bench, or of a supporting surface on which the slabs to be scarfed are arranged.
- the operating head is equipped with a hood, integral to said operating head while the latter moves.
- Said hood is placed over the slab surface to be scarfed, and is connected to a sliding seal, acting as a hood, which directs the smoke and dust into a manifold directly connected to the exhaust fan.
- the above described known device has the drawback that it sucks in and removes from the working area only a part of the dust and smoke generated during the scarfing operation.
- the residual dust and smoke thus, remain in the working area, negatively affecting the working conditions; further damages to machinery in the working area are to be ascribed to the effects of the smoke and dust which have not been sucked in by the hood.
- the purpose of the present invention is to eliminate such drawbacks, by using a retractable tunnel of a particular shape, which can move together with the operating head and makes it possible to collect all the dust and smoke generated during the scarfing operation.
- the retractable tunnel is secured at one end to a wall placed near the end of the bench and on which the suction duct begins for the smoke sucked in by a suitable exhaust fan.
- the retractable tunnel is secured to the scarfing head by means of a firm metal structure, and follows its movement, contracting while said head operates and expanding when it goes back to its start position for a new operation cycle.
- the retractable tunnel according to the invention has the shape of a bellow, suitably supported.
- 10 indicates a long shaped base on which the slabs to be scarfed are to be placed; said base 10 has, on its sides, two rails 11, on which the supporting means of the scarfing head and of the bellow shaped retractable tunnel slide, all of which having reference number 20.
- the retractable tunnel 20 is formed by a number of folds 21, made of fire and abrasion proof material. It results in a bellow shape which enables the retractable tunnel to change from the expanded position, shown in figure 1, to the contracted position shown in figure 2
- the bellow shaped retractable tunnel is provided with frames 22, substantially shaped like an upside down U, located at pre-set spaces, for example, constant ones.
- Said frames are connected to joints 32 of the articulated arms 32 of a pair of pantographs 30, placed at both sides of the tunnel.
- Joints 32 of arms 31 suitably slide along frames 22 of the bellow shaped retractable tunnel.
- bellow shaped retractable tunnel 20 is suspended from a pair of portals 40, provided with feet 41, which, by means of wheels 42 move along said rails 11. Arms 31 and joints 32 of pantograph 30 allow for uniform length variations of the retractable tunnel.
- the bellow shaped retractable tunnel is also supported on its front part, by the supporting frame 60 of the scarf ing head, said frame being supported by a carriage 61, provided with moving equipment.
- the retractable tunnel On its rear part, which is fixed, the retractable tunnel is secured to a wall, for example a plain concrete wall 43, through which the dust and smoke suction duct 44 goes, which terminates against said wall.
- a wall for example a plain concrete wall 43, through which the dust and smoke suction duct 44 goes, which terminates against said wall.
- the retractable tunnel 20 and the scarfing head 62 are pulled back to cover the slabs 70 which have just been arranged on base 10.
- the retractable tunnel 20 reaches here its maximum length (see figure 1).
- the scarfing head 62 is then started, together with a fan, not shown in figure, which'sucks in the smoke generated inside the tunnel, through duct 44 (see figure 1).
- the opening between the front part of the tunnel and the supporting and transporting structure of the head does not allow for a flow of smoke as, due to said fan, through said opening a strong current of air flows in.
- the cleansing means for raceways 12 consist of paddles 45 supported articulately by feet 41 of the mobile suspension portals of the tunnel.
- Said paddles have a cross section which is substantially equal to the cross section of the raceways 12. If the working direction of the scarfing head is that shown by arrow F1, they are provided with pawl means preventing a rotation towards the right beyond the vertical position shown in the right part of figure 3: in this way, they gather the dust and deposits which settle on the bottom of raceways 12, and direct them to a system of collection tanks and hydroseparators indicated schematically with reference number 46.
- paddles can freely rotate towards the left, with respect to figure 3, they scrape the upper surface of the deposits settled in raceways 12, during the return of the retractable tunnel from the position shown in figure 2 to the position shown in figure 1 (see arrow F2 in figure 3).
- raceways 12 are cleaned automatically and continuously.
- the latter in order to protect the retractable tunnel walls from the jets of red-hot material caused by the scarfing head work, the latter is equipped with a side deflector 51, and with an upper deflector 52.
- the jets of red-hot material caused by the scarfing head work are deviated in the longitudinal direction of the tunnel, so as to protect its side and upper walls.
- the part of the tunnel facing the scarfing head is made of two suitably hardened iron sheets: an upper iron sheet "53", and a side iron sheet "54".
- Deflectors 51 and 52, and iron sheets 53 and 54 are placed only on one side, in view of the fact that, as shown in figures 1, 2 and 4, the scarfing head faces downwards and sideways.
- raceways 12 shown in figure 5 corresponds to the embodiment shown in figures 1, 2 and 4, with the retractable tunnel frame external to the tunnel itself.
Landscapes
- Lining And Supports For Tunnels (AREA)
- Incineration Of Waste (AREA)
Abstract
Description
- The present invention refers to a device to collect and dump the smoke and dust generated during a scarfing operation of slabs.
- It is well known that slabs, and other metallurgical semifinished products in general, must be scarfed before any successive operations, that is to say, the defective surface material must be removed.
- This is done by means of a 100 mm diameter torch, which, through the spark-starting of a voltaic arc, forms a bath of molten steel on the surface, which it pushes along the entire slab surface, by the pressure of the oxygen and the longitudinal traverse of the apparatus. The transverse and longitudinal inclinations of the nozzle render such an operation easy.
- should be noted that such scarfing operation is carried out by sliding the scarfing head described above, along two rails located on the sides of a bench, or of a supporting surface on which the slabs to be scarfed are arranged. It is known that, in order to remove the dust and smoke generated by the scarfing operation from the working area, the operating head is equipped with a hood, integral to said operating head while the latter moves. Said hood is placed over the slab surface to be scarfed, and is connected to a sliding seal, acting as a hood, which directs the smoke and dust into a manifold directly connected to the exhaust fan.
- The above described known device has the drawback that it sucks in and removes from the working area only a part of the dust and smoke generated during the scarfing operation. The residual dust and smoke, thus, remain in the working area, negatively affecting the working conditions; further damages to machinery in the working area are to be ascribed to the effects of the smoke and dust which have not been sucked in by the hood.
- t Hence, the purpose of the present invention is to eliminate such drawbacks, by using a retractable tunnel of a particular shape, which can move together with the operating head and makes it possible to collect all the dust and smoke generated during the scarfing operation.
- Moreover, as such dust and smoke often cause the plant to be stopped because of the impossibility for the staff to work there, therefore causing a loss in production, the present invention is a thorough solution to said problems.
- It should also be remembered that scarfing is very noisy (because of the oxygen blast) and the retractable tunnel has also the function of lowering noise level.
- The retractable tunnel, according to the invention is secured at one end to a wall placed near the end of the bench and on which the suction duct begins for the smoke sucked in by a suitable exhaust fan. At its other end, the retractable tunnel is secured to the scarfing head by means of a firm metal structure, and follows its movement, contracting while said head operates and expanding when it goes back to its start position for a new operation cycle.
- The retractable tunnel according to the invention has the shape of a bellow, suitably supported.
- The essential characteristics of the invention are summed up and described in the claims; its advantages and objects will also be discussed in the following specification, with respect to embodiments chosen by way of example only and with particular reference to the enclosed drawings, in which:
- Figure 1 shows a side perspective view of the retractable tunnel according to the invention, in the expanded position;
- Figure 2 shows a top view of the retractable tunnel according to the invention, in the closed position;
- Figure 3 shows a longitudinal vertical section view of one of the two side raceways in which the bottom parts of the tunnel sides project, so as to form a hydraulic seal against the flow of smoke. Said figure dealing in particular with the means necessary to remove the dust and deposits which continuously settle in said raceways;
- Figure 4 shows a view of the scarfing head according to plane IV-IV figure 2;
- Figure 5 and 6 show a cross section of two possible positions of the above mentioned raceways.
- With particular reference to figure 1, 2 and 3: 10 indicates a long shaped base on which the slabs to be scarfed are to be placed; said
base 10 has, on its sides, tworails 11, on which the supporting means of the scarfing head and of the bellow shaped retractable tunnel slide, all of which havingreference number 20. - Along the internal side of the two
tracks 11, there are tworaceways 12 full of water, in which the lower parts of theretractable tunnel 20 project, so as to form a hydraulic seal. - The
retractable tunnel 20 is formed by a number offolds 21, made of fire and abrasion proof material. It results in a bellow shape which enables the retractable tunnel to change from the expanded position, shown in figure 1, to the contracted position shown in figure 2 - In order for it to stiffen up transversally, the bellow shaped retractable tunnel is provided with
frames 22, substantially shaped like an upside down U, located at pre-set spaces, for example, constant ones. - Said frames are connected to
joints 32 of the articulatedarms 32 of a pair ofpantographs 30, placed at both sides of the tunnel.Joints 32 ofarms 31 suitably slide alongframes 22 of the bellow shaped retractable tunnel. - Furthermore, the bellow shaped
retractable tunnel 20 is suspended from a pair ofportals 40, provided withfeet 41, which, by means ofwheels 42 move along saidrails 11.Arms 31 andjoints 32 ofpantograph 30 allow for uniform length variations of the retractable tunnel. - The bellow shaped retractable tunnel is also supported on its front part, by the supporting
frame 60 of the scarf ing head, said frame being supported by acarriage 61, provided with moving equipment. - On its rear part, which is fixed, the retractable tunnel is secured to a wall, for example a
plain concrete wall 43, through which the dust and smoke suction duct 44 goes, which terminates against said wall. - The operation is therefore very simple: when the tunnel is in its contracted position (see figure 2),
slabs 70 to be scarfed are placed onbase 10. As in its contracted position the tunnel according to the invention has an extremely short length, depending substantially on the size ¡offeet 41 of supportingportals 40, the area of thebase 10 available for theslabs 70 to be scarfed is used in the best way. - When the
slabs 70 to be scarfed are arranged, theretractable tunnel 20 and thescarfing head 62 are pulled back to cover theslabs 70 which have just been arranged onbase 10. Theretractable tunnel 20 reaches here its maximum length (see figure 1). - The
scarfing head 62 is then started, together with a fan, not shown in figure, which'sucks in the smoke generated inside the tunnel, through duct 44 (see figure 1). - As the
scarfing head 62 moves forward, the length of thetunnel 20 decreases until it reaches the final position shown in figure 2. - As the lower ends of the side walls of the tunnel move in the water contained in
raceways 12, a perfect seal of the tunnel is obtained, preventing the dust and smoke from leaking through into the working area surrounding the tunnel. . - The opening between the front part of the tunnel and the supporting and transporting structure of the head, does not allow for a flow of smoke as, due to said fan, through said opening a strong current of air flows in.
- In figure 3 are shown the cleansing means for raceways 12: they consist of
paddles 45 supported articulately byfeet 41 of the mobile suspension portals of the tunnel. - Said paddles have a cross section which is substantially equal to the cross section of the
raceways 12. If the working direction of the scarfing head is that shown by arrow F1, they are provided with pawl means preventing a rotation towards the right beyond the vertical position shown in the right part of figure 3: in this way, they gather the dust and deposits which settle on the bottom ofraceways 12, and direct them to a system of collection tanks and hydroseparators indicated schematically withreference number 46. - As said paddles can freely rotate towards the left, with respect to figure 3, they scrape the upper surface of the deposits settled in
raceways 12, during the return of the retractable tunnel from the position shown in figure 2 to the position shown in figure 1 (see arrow F2 in figure 3). - Therefore,
raceways 12 are cleaned automatically and continuously. - With particular reference to figures 1, 2 and 4: in order to protect the retractable tunnel walls from the jets of red-hot material caused by the scarfing head work, the latter is equipped with a
side deflector 51, and with anupper deflector 52. Thus, the jets of red-hot material caused by the scarfing head work, are deviated in the longitudinal direction of the tunnel, so as to protect its side and upper walls. - Moreover, the part of the tunnel facing the scarfing head, is made of two suitably hardened iron sheets: an upper iron sheet "53", and a side iron sheet "54".
- In this way, the jets of red-hot material which the
deflectors protection iron sheets -
Deflectors iron sheets - With particular reference to figures 5 and 6, they show the two possible positions of the
guide rails 11 with respect toraceways 12, respectively 112. - The position of
raceways 12, shown in figure 5, corresponds to the embodiment shown in figures 1, 2 and 4, with the retractable tunnel frame external to the tunnel itself. - Such solution has the advantage that the tunnel supporting structures are protected against dust'and jets of molten metal and slag caused by the scarfing head.
- The solution shown in figure 6, on the other hand, would allow for an increase of the distance between the tunnel walls and the slabs, thereby increasing the tunnel wall durability.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1260783 | 1983-08-10 | ||
IT12607/83A IT1172935B (en) | 1983-08-10 | 1983-08-10 | RETRACTABLE TUNNEL FOR THE ASPIRATION OF THE SMOKES GENERATED DURING THE SANDING OPERATION OF A SLAB |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0136983A2 true EP0136983A2 (en) | 1985-04-10 |
EP0136983A3 EP0136983A3 (en) | 1987-12-09 |
EP0136983B1 EP0136983B1 (en) | 1989-04-26 |
Family
ID=11142135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84830227A Expired EP0136983B1 (en) | 1983-08-10 | 1984-07-25 | Device to collect and dump the smoke and dust which are generated during a scarfing operation of slabs |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0136983B1 (en) |
DE (1) | DE3477898D1 (en) |
ES (1) | ES8505560A1 (en) |
IT (1) | IT1172935B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103143541A (en) * | 2013-03-11 | 2013-06-12 | 广西中海环境工程设备有限公司 | Retractable dust removing system for large-sized workpiece |
CN105855258A (en) * | 2016-05-30 | 2016-08-17 | 哈电集团(秦皇岛)重型装备有限公司 | Push-pull type cleaning protective device and cleaning protective method |
CN108787684A (en) * | 2018-07-20 | 2018-11-13 | 济南华信自动化工程有限公司 | The removable weldering cigarette dust exhaust apparatus of one kind |
CN111112274A (en) * | 2020-01-29 | 2020-05-08 | 中冶重工(唐山)有限公司 | Steel ladle dedusting process |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104625493A (en) * | 2014-12-10 | 2015-05-20 | 芜湖福马汽车零部件有限公司 | Welding work room dust removal device for air compressor production |
CN107030079A (en) * | 2017-05-26 | 2017-08-11 | 大连兆和环境科技股份有限公司 | A kind of collapsible dust gathering arrester of large span moving telescopic |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3176971A (en) * | 1962-10-08 | 1965-04-06 | Kirk And Blum Mfg Company | Metal scarfing apparatus |
US3695600A (en) * | 1969-09-18 | 1972-10-03 | Messer Griesheim Gmbh | Apparatus for flame scarfing the surfaces of crude blocks, billets, ingots and similar workpieces |
US3862749A (en) * | 1974-01-30 | 1975-01-28 | Af Ind | Metal slab conditioning system |
DE2548078A1 (en) * | 1975-10-28 | 1977-05-12 | Messer Griesheim Gmbh | DEVICE FOR THE REMOVAL OF SMOKE GASES, DUST AND THE LIKE |
GB2064395A (en) * | 1979-10-04 | 1981-06-17 | Mitsubishi Heavy Ind Ltd | Process and apparatus for exhausting welding fumes produced during arc welding |
EP0051250A1 (en) * | 1980-10-31 | 1982-05-12 | MDS Mannesmann Demag Sack GmbH | Torch cutting machine with sound proofing means |
-
1983
- 1983-08-10 IT IT12607/83A patent/IT1172935B/en active
-
1984
- 1984-07-25 EP EP84830227A patent/EP0136983B1/en not_active Expired
- 1984-07-25 DE DE8484830227T patent/DE3477898D1/en not_active Expired
- 1984-08-09 ES ES535017A patent/ES8505560A1/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3176971A (en) * | 1962-10-08 | 1965-04-06 | Kirk And Blum Mfg Company | Metal scarfing apparatus |
US3695600A (en) * | 1969-09-18 | 1972-10-03 | Messer Griesheim Gmbh | Apparatus for flame scarfing the surfaces of crude blocks, billets, ingots and similar workpieces |
US3862749A (en) * | 1974-01-30 | 1975-01-28 | Af Ind | Metal slab conditioning system |
DE2548078A1 (en) * | 1975-10-28 | 1977-05-12 | Messer Griesheim Gmbh | DEVICE FOR THE REMOVAL OF SMOKE GASES, DUST AND THE LIKE |
GB2064395A (en) * | 1979-10-04 | 1981-06-17 | Mitsubishi Heavy Ind Ltd | Process and apparatus for exhausting welding fumes produced during arc welding |
EP0051250A1 (en) * | 1980-10-31 | 1982-05-12 | MDS Mannesmann Demag Sack GmbH | Torch cutting machine with sound proofing means |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103143541A (en) * | 2013-03-11 | 2013-06-12 | 广西中海环境工程设备有限公司 | Retractable dust removing system for large-sized workpiece |
CN105855258A (en) * | 2016-05-30 | 2016-08-17 | 哈电集团(秦皇岛)重型装备有限公司 | Push-pull type cleaning protective device and cleaning protective method |
CN105855258B (en) * | 2016-05-30 | 2018-05-04 | 哈电集团(秦皇岛)重型装备有限公司 | A kind of plug-type cleaning and protecting device and cleaning means of defence |
CN108787684A (en) * | 2018-07-20 | 2018-11-13 | 济南华信自动化工程有限公司 | The removable weldering cigarette dust exhaust apparatus of one kind |
CN111112274A (en) * | 2020-01-29 | 2020-05-08 | 中冶重工(唐山)有限公司 | Steel ladle dedusting process |
Also Published As
Publication number | Publication date |
---|---|
EP0136983B1 (en) | 1989-04-26 |
ES535017A0 (en) | 1985-06-01 |
EP0136983A3 (en) | 1987-12-09 |
IT8312607A0 (en) | 1983-08-10 |
ES8505560A1 (en) | 1985-06-01 |
DE3477898D1 (en) | 1989-06-01 |
IT1172935B (en) | 1987-06-18 |
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