CN201339935Y

CN201339935Y - Energy concentration supersonic speed continuous casting cutting nozzle

Info

Publication number: CN201339935Y
Application number: CNU2008202147458U
Authority: CN
Inventors: 陈国庆
Original assignee: YANGZHOU HONGCHANG MACHINE CO Ltd
Current assignee: YANGZHOU HONGCHANG MACHINE CO Ltd
Priority date: 2008-12-11
Filing date: 2008-12-11
Publication date: 2009-11-04
Anticipated expiration: 2018-12-11

Abstract

The utility model relates to an energy concentration supersonic speed continuous casting cutting nozzle, and belongs to the technical field of metal cutting devices. The energy concentration supersonic speed continuous casting cutting nozzle is mainly characterized in that the cutting nozzle comprises a cylindrical upper main body, a lower main body which is connected with one end of the upper main body and has one circular frustum-shaped end, a spray pipe built in the axial central hole of the lower main body and a sleeve casing sleeved outside the upper main body and the lower main body; the axial through hole of the spray pipe is connected with the high pressure oxygen hole of the upper main body; and the inner wall of the hole is a vase-shaped streamline type curved surface. In the utility mode, the oxygen supply pressure can be effectively reduced to 0.6 to 1.0 MPa; the cutting speed of a continuous casting blank can be improved by above 30 percent; because the hole diameters of a fuel gas hole and a preheating oxygen hole are smaller, the total flow capacity of gas is less, therefore, a large amount of fuel gas and oxygen can be saved during the cutting process; a cutting seam can be reduced to 1 to 2.5 mm; the cutting section is level, the upper edge thereof does not fall down, and the lower edge thereof can not occur adhering slag, so as to completely satisfy the demands of modern steel enterprises.

Description

Cumulative supersonic speed continuous casting cutting head

Technical field

The utility model relates to a kind of cumulative supersonic speed continuous casting cutting head, belongs to Metal Cutting device technique field.

Background technology

Perfect day by day along with smelting technique and technology, the specification of square billet, slab and round billet continuous casting machine is to large scale development, the casting speed that improves strand is an inevitable trend, and the cutting operation of strand flame cutting machine is online finishing, and synchronous with the mobile maintenance of strand.Owing to be subjected to the restriction of place and technology, the strand scale size of cutting is short as far as possible, so the cutting speed of cutting torch become to improve the key of continuous casting production efficiency, thus require higher continuous casting cutting speed, to satisfy the requirement of the casting speed of raising day by day.In addition, the metal loss of cutting slot more and more is much accounted of.Simultaneously the quality of cutting section is also had higher requirement, cutting section requires smooth, dross will be lacked, existing continuous casting cutting nozzle is because of its reasons in structure, the mist flat fire ejection of its combustion gas and preheat oxygen causes firepower not concentrate, and the cutting oxygen jet pipe adopts a kind of fertile material to be processed into, and is not in place because of the length and the tubular form processing oxygen of its jet pipe in addition, and inwall is not wear-resisting, and service life is short.

Summary of the invention

It is little that the purpose of this utility model provides a kind of power consumption, and firepower is concentrated, wind line length and tall and straight strong, moving property is good, penetration power is strong, and the cutting slot is little, face is smooth, fireballing cumulative supersonic speed continuous casting cutting head.

The purpose of this utility model is achieved through the following technical solutions, a kind of cumulative supersonic speed continuous casting cutting head, it is characterized in that described cutting torch is by the last main body that is cylindrical shape, with the following main body that last main body one end joins, an end is circular cone shape, jet pipe of inserting in the following main body axial center hole and the sheath body that is enclosed within outside main body, the following main body constitute; The hyperbaric oxygen hole of the axially extending bore of described jet pipe and last main body joins, and the inwall in hole is the streamlined curved surface of " vase-like ", is divided into stable section, diffuser, cumulative section and high speed steady flow segment.

Described axial central part setting of going up main body is truncated cone hyperbaric oxygen air admission hole, the last main body end face of the big end of truncated cone air admission hole is provided with the combustion gas air inlet duct and the preheat oxygen air inlet duct of ring-type from inside to outside, the last main body end face of truncated cone air admission hole small end is provided with the once mixed air drain of ring-type, mix on the air drain some gas mixed holes are set, suitable for reading and the fuel gas hole and the preheating oxygen hole that lead to combustion gas air inlet duct and preheat oxygen air inlet duct respectively of each gas mixed hole communicate, and are the cylindrical main body upper end of going up and are the evagination step.

The groove width of described combustion gas air inlet duct and preheat oxygen air inlet duct is respectively 1～4mm, 1.5～4.5mnm, and groove depth is respectively 0.8～2.5mm, 1～3mm; 2～16 combustion gas through holes and 2～16 preheat oxygen through holes are set respectively in combustion gas air inlet duct and the preheat oxygen air inlet duct, and its aperture is respectively 0.2～1.3mm and 0.4～2.6mm; The corresponding connection back extension in last main body of two holes communicates with the gaseous mixture body opening, and gaseous mixture body opening aperture is 0.4～2.6mm; The described width and the degree of depth of once mixing air drain is respectively 2～7mm and 1.5～4mm.

The described hyperbaric oxygen air admission hole heavy caliber of going up main body is 1.8～8.5mm, and small-bore is 1.3～6.5mm, and the length of hyperbaric oxygen air admission hole is 10～42mm.

Described main body down has axial center hole, one end is circular cone shape, the other end is cylindrical shape, be than the little cylinder of an end cylinder diameter between the both ends, the inwall of its cylindrical outer wall and sheath body forms the secondary mixing air chamber, and an end cylinder axis is to being provided with 2～16 mist through holes, and the mist through hole communicates with the secondary mixing air chamber, the mist through-hole aperture is 0.4～2.6mm, and its length is 4～9mm; The length of described secondary mixing air chamber and the degree of depth are respectively 12～18mm and 1.5～6mm.

Described main body circular cone shape down is respectively 12～24mm and 2～8mm near the round platform diameter and the length partly perpendicular to the plane of secondary mixing air chamber; Following main body outlet side minimum diameter is 6～14mm, and the vertical length of its frustum of a cone contraction section is 10～16mm, and its angle of taper is 25 °～45 °; The outer peripheral face of the frustum of a cone is provided with 10～21 axial notches, and the width of groove and the degree of depth are respectively 0.5～1.5mm and 1.5～2.5mm.

The total length of described jet pipe is 20～45mm, and inwall has one deck antifriction metal (AFM) protective layer; The inlet calibre of its stable section is 1.3～6.5mm, equate with the hyperbaric oxygen of last main body outlet bore and be connected, begin internal diameter from diffuser and slowly become big, maximum inner diameter is 3.8～8mm, begun slowly to receive little again by the cumulative section, being reduced to minimum until the internal diameter of high speed steady flow segment is 1.4～2.7mm, and the length of high speed steady flow segment is 5～15mm, this section is a parallel-segment, and the bore of entrance and exit equates.

One end of described sheath body has external screw thread, outer threaded portion is followed successively by hexagon section, shell portion, the frustum of a cone section of one, insert down main body and last main body in the axially extending bore of sheath body successively, the external diameter of last main body upper end evagination step is greater than the internal diameter of sheath body external thread part, the lower plane of sheath body will grow down the lower plane 1～3mm of main body, and the entire length after last main body and following main body are inserted in the sheath body successively is 40～80mm.

The utility model is the improvement to existing cutting head structure, jet pipe in the existing cutting head mostly adopts the structure of simple processing technology, jet pipe oxygen flow duct mostly is the linear pattern design, and this structure is easy to generate shock wave and a large amount of turbulent flows, causes a large amount of losses of energy; And the essence of continuous casting billet flame cutting is the burning of iron in oxygen flow, is oxidation reaction, and active is the purity and the kinetic energy of oxygen flow, must import high-purity, high-octane Oxygen Flow to cutting zone, strengthens reaction and improves the ability of washing away slag.It is cylindrical that the cutting oxygen duct of common cutting torch is ladder, the geometry of die cavity and roughness have limited the raising of exit velocity, chap causes significant sinuous flow if the oxygen pressure of unilateral raising cutting torch porch only can make the air-flow lateral expansion of outlet, cause cutting oxygen purity descends because suck ambient air, worsen the effect of cutting, make slot become big, the top fusing of otch, form horn mouth, bottom dross phenomenon is serious.

The central part of main body adopts the cumulative supersonic nozzle under the utility model, the die cavity of the principle design cutting torch hyperbaric oxygen of applied aerodynamics, form by the contraction section of last main part and stable section, diffuser, cumulative section and the high speed steady flow segment of following main part, the whole perforation is converted into kinetic energy with the potential energy of Compressed Gas.Contraction section plays the gas importing and gradually reduces and quickens the effect of air-flow; Stable section plays the effect of transition, and the high velocity air that contraction section is sent into is stable to be transported to next stage, and be air-flow from subsonic speed to ultrasonic transition stage; Diffuser reaches the acceleration of further expanding of ultrasonic air-flow with what stable section was sent into; Further Compressed Gas density of air-flow and quickening air velocity that the cumulative section will expand on last stage and quicken, 2.5～3 overtone speed that finally reach the exit play the important function that thick long-pending book is sent out; Steady flow segment plays the effect that the supersonic airstream that makes outlet obtains the stronger parallel airflow of directionality, and this section design is longer, exactly for the supersonic airstream of outlet can be remained a constant speed in length one segment distance and enough parallel conductive being arranged to output region.

Combustion gas and preheat oxygen respectively on the last main body the combustion gas air inlet duct on plane and preheat oxygen air inlet duct import, mix in two gas joints after mix the once mixed air drain that pore enters lower plane by fuel gas hole and preheating oxygen hole, carry out step-down for the first time and mix the back and import the secondary mixing air chamber by the mixing pore on plane on the main body down, realize step-down for the second time and fully mix after again the groove around main body end down penetrate.The process of cutting is to utilize gas flame that metal is preheating to the temperature that can burn in Oxygen Flow, penetrates the hyperbaric oxygen air-flow then and makes the metal vigorous oxidation become slag, and with slag oxygen blast from slot of oxidation, thereby reach the purpose that continuous casting billet is separated.

Consider that the oxygen pressure that the continuous casting flame cutting machine provides is generally 0.8～1.4Mp19, need to expend a large amount of oxygen in the cutting, and the utility model of selecting to design behind the design parameter of 2.5～3 times of factors as continuous casting cutting head die cavity can effectively be reduced to oxygen supply pressure 0.6～1.0Mp19, and the cutting speed of continuous casting billet can improve more than 30%, because the aperture design of fuel gas hole of the present utility model and preheating oxygen hole is less, thereby the total flow of gas is also less, so cutting the time can be saved a large amount of combustion gas and oxygen.Cutting seam can be reduced to 1～2.5mm, and the cut length face is smooth, the upper limb limit of not collapsing, and lower edge is dross not, can satisfy the modern steel requirement of enterprise fully.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model plan structure schematic diagram;

Fig. 3 looks up structural representation for the utility model;

Among the figure, 1 combustion gas air inlet duct, 2 preheat oxygen air inlet ducts, 3 hyperbaric oxygen air admission holes, 4 fuel gas holes, 5 preheating oxygen holes, 6 gas mixing pipes, 7 once mix air drain, 8 evagination steps, 9 combustion gas and preheat oxygen joint, 10 gas mixed holes, 11 secondary mixing air chambers, 12 grooves of giving vent to anger, 13 steps that cave in, 14 stable sections, 15 diffusers,, 16 cumulative sections, 17 high speed steady flow segments, the outlet of 18 hyperbaric oxygen, main body on 19,20 times main bodys, 21 sheath bodies, 22 jet pipes.

The specific embodiment

Further specify the utility model in conjunction with the accompanying drawings and embodiments, as shown in Figure 1, the utility model adopts the red copper material to make, and is made of last main body 19, following main body 20, sheath body 21 and jet pipe 22.Inlay cumulative supersonic nozzle 22 in the axial center hole of following main body 20.To descend main body 20, go up main body 19 and pack into successively in the whole sheath body 21, the external screw thread through the position, upper end of whole sheath body 21 is connected also fastening with the internal thread of burning torch mouth.The width of the combustion gas air inlet duct 1 on plane and preheat oxygen air inlet duct 2 is respectively 1.3mm and 2mm on the last main body 11, and the degree of depth is 1.3mm; The bore up and down in hyperbaric oxygen hole 3 is respectively 5mm and 2.5mm; The aperture is respectively fuel gas hole 4 and preheating oxygen hole 5 each even distribution 10 in annular air inlet duct of 0.6mm and 1.2mm, be connected with the air drain 7 that once mixes of lower plane by gas mixed hole 6, the aperture of gas mixed hole 6 is 1.2mm, and the width and the degree of depth of once mixing air drain 7 are 4mm and 2mm; Import the secondary mixing air chamber 11 that forms between whole sheath body 21 inwalls and following main body 20 outer walls around the annular mist that gas mixed hole 10 that 10 apertures are 1.2mm will once mix in the air drain that evenly distributes on the plane on the following main body 20, it is 15mm that secondary mixing gas stops up 11 length; 18 roads of being offered altogether around terminal by following main body 20 groove 12 of giving vent to anger penetrates the gas that abundant step-down mixes again, and 12 the degree of depth and width are respectively 2mm and 0.6mm; Following main body 20 outlet sides and secondary mixing air chamber 11 near diameter and length perpendicular to the round platform on plane part be respectively 16mm and 4mm, the outlet side diameter is 10mm, the vertical length of its frustum of a cone contraction section is 12.6mm, its angle of taper is 26.78 °.Main body is loaded in the whole sheath body 21, and sheath body 21 lower planes will grow down main body 20 lower plane 2mm.This design is intended to allow the lower plane of sheath body 21 grow root one segment distance of flame, makes the root of flame not be subjected to the influence of air pressure, thus the fiery Shu Gengwei of flame concentrate, tall and straight.

The 22 inwall nickel plating of the utility model cumulative supersonic nozzle, have stable section 14, diffuser 15, cumulative section 16 and high speed steady flow segment 17, the bore of stable section 14 inlets is 2.5mm, the maximum inner diameter of diffuser 15 is 5.5mm, the outlet of cumulative section 16 is the inlet of high speed steady flow segment 17, its internal diameter equates with the outlet of high speed steady flow segment 17 to be 1.9mm that the length of high speed steady flow segment 17 is 8mm.

Claims

1, a kind of cumulative supersonic speed continuous casting cutting head, it is characterized in that described cutting torch is by the last main body that is cylindrical shape, with the following main body that last main body one end joins, an end is circular cone shape, jet pipe of inserting in the following main body axial center hole and the sheath body that is enclosed within outside main body, the following main body constitute; The hyperbaric oxygen hole of the axially extending bore of described jet pipe and last main body joins, and the inwall in hole is the streamlined curved surface of " vase-like ", is divided into stable section, diffuser, cumulative section and high speed steady flow segment.

2, cumulative supersonic speed continuous casting cutting head according to claim 1, it is characterized in that described axial central part setting of going up main body is truncated cone hyperbaric oxygen air admission hole, the last main body end face of the big end of truncated cone air admission hole is provided with the combustion gas air inlet duct and the preheat oxygen air inlet duct of ring-type from inside to outside, the last main body end face of truncated cone air admission hole small end is provided with the once mixed air drain of ring-type, mix on the air drain some gas mixed holes are set, suitable for reading and the fuel gas hole and the preheat oxygen that lead to combustion gas air inlet duct and preheat oxygen air inlet duct respectively of each gas mixed hole communicate, and are the cylindrical main body upper end of going up and are the evagination step.

3, cumulative supersonic speed continuous casting cutting head according to claim 2 is characterized in that the groove width of described combustion gas air inlet duct and preheat oxygen air inlet duct is respectively 1～4mm, 1.5～4.5mnm, and groove depth is respectively 0.8～2.5mm, 1～3mm; 2～16 combustion gas through holes and 2～16 preheat oxygen through holes are set respectively in combustion gas air inlet duct and the preheat oxygen air inlet duct, and its aperture is respectively 0.2～1.3mm and 0.4～2.6mm; The corresponding connection back extension in last main body of two holes communicates with the gaseous mixture body opening, and gaseous mixture body opening aperture is 0.4～2.6mm; The described width and the degree of depth of once mixing air drain is respectively 2～7mm and 1.5～4mm.

4, cumulative supersonic speed continuous casting cutting head according to claim 2 is characterized in that the described hyperbaric oxygen air admission hole heavy caliber of going up main body is 1.8～8.5mm, and small-bore is 1.3～6.5mm, and the length of hyperbaric oxygen air admission hole is 10～42mm.

5, cumulative supersonic speed continuous casting cutting head according to claim 1, it is characterized in that described main body down has axial center hole, one end is warhead shape, the other end is cylindrical shape, be than the little cylinder of an end cylinder diameter between the both ends, the inwall of its cylindrical outer wall and sheath body forms the secondary mixing air chamber, one end cylinder axis is to 2～16 mist through holes are set, the mist through hole communicates with the secondary mixing air chamber, the mist through-hole aperture is 0.4～2.6mm, and its length is 4～9mm; The length of described secondary mixing air chamber and the degree of depth are respectively 12～18mm and 1.5～6mm.

6, cumulative supersonic speed continuous casting cutting head according to claim 1, it is characterized in that described down main body circular cone shape near the diameter and the length perpendicular to the round platform part on plane of secondary mixing air chamber be respectively 12～24mm and 2～8mm; Following main body outlet side minimum diameter is 6～14mm, and the vertical length of its frustum of a cone contraction section is 10～16mm, and its angle of taper is 25 °～45 °; The outer peripheral face of the frustum of a cone is provided with 12～21 axial notches, and the width of groove and the degree of depth are respectively 0.5～1.5mm and 1.5～2.5mm.

7, cumulative supersonic speed continuous casting cutting head according to claim 1, the total length that it is characterized in that described jet pipe is 20～45mm, inwall has one deck antifriction metal (AFM) protective layer; The inlet calibre of its stable section is 1.3～6.5mm, equate with the hyperbaric oxygen of last main body outlet bore and be connected, begin internal diameter from diffuser and slowly become big, maximum inner diameter is 3.8～6.8mm, begun slowly to receive little again by the cumulative section, being reduced to minimum until the internal diameter of high speed steady flow segment is 1.4～2.7mm, and the length of high speed steady flow segment is 5～15mm, this section is a parallel-segment, and the bore of entrance and exit equates.

8, cumulative supersonic speed continuous casting cutting head according to claim 1, an end that it is characterized in that described sheath body has external screw thread, outer threaded portion is followed successively by hexagon section, shell portion, the frustum of a cone section of one, insert down main body and last main body in the axially extending bore of sheath body successively, the external diameter of last main body upper end evagination step is greater than the internal diameter of sheath body external thread part, the lower plane of sheath body will grow down the lower plane 1～3mm of main body, and the entire length after last main body and following main body are inserted in the sheath body successively is 40～80mm.

9, cumulative supersonic speed continuous casting cutting head according to claim 1 is characterized in that main body, following main body, sheath body all adopt the red copper material to make.