Melt transport device, melt transport device provided with a lance, and method for producing a lance for the melt transport device

Abstract

The invention relates to a lance (5) for a melt transport device (1). The lance (5) comprises: a connection end (20) for connecting to the melt transport device (1); a siphon (10); and a tubular flow connection section (21) extending between the connection end (20) and the siphon (10) and forming a flow connection channel (22) between the connection end (20) and the siphon (10). The lance (5) has a main part (26) and a siphon cap (27), wherein the main part (26) and the siphon cap (27) are each independent components, which are coupled to one another, wherein the siphon (10) is formed via cooperation of the main part (26) and the siphon cap (27).

Description

[0001] Melt transport device, as well as a melt transport device equipped with the lance, and a method for producing a lance for the melt transport device

[0002] The invention relates to a lance for a melt transport device, as well as a melt transport device equipped with the lance, and a method for producing a lance for the melt transport device.

[0003] DE 102007 011 253 A1 discloses a casting device with a melt container for metallic materials. An injector is arranged on the underside of the melt container, which has an opening for discharging the melt. Furthermore, a closing device is provided, which serves to close the opening.

[0004] The casting device known from DE 10 2007 011 253 A1 has the disadvantage that the closing device can become dirty, as a result of which its tightness can no longer be guaranteed after a certain amount of use. The casting device and the casting process also have the disadvantage that the described design of the closing device means that the flow behavior and the flow velocity of the melt during casting can only be inadequately controlled. The casting device and the casting process also have the disadvantage that, due to the positioning of the closing device above the lance, the melt hits the casting mold from a great height, which can damage the mold. In addition, the great drop height can cause turbulence and thus oxide inclusions in the casting. This all leads to the production of inferior cast workpieces.

[0005] The object of the present invention was to overcome the disadvantages of the prior art and to provide a device and a method by means of which improved cast workpieces can be produced.

[0006] This object is achieved by a device and a method according to the claims.

[0007] According to the invention, a lance is designed for a melt transport device.

[0008] Lance includes:

[0009] - a connection end for connection to the melt transport device; - a siphon;

[0010] - a tubular flow connection section extending between the connection end and the siphon and forming a flow connection channel between the connection end and the siphon.

[0011] The lance has a main part and a siphon cap, wherein the main part and the siphon cap are each independent components which are coupled to one another, wherein the siphon is formed by the interaction of the main part and the siphon cap.

[0012] The lance according to the invention offers the advantage that the main part and the siphon cap together form the siphon, whereby a corresponding internal geometry for forming the siphon can be easily realized by using individual components. In particular, the measures according to the invention make it possible for the individual components of the lance to be manufactured using a primary forming process, such as pressing a blank.

[0013] Furthermore, it can be expedient if the siphon cap is inseparably coupled to the main part. This has the advantage that this measure can create a melt-tight connection between the siphon cap and the main part. An inseparable connection between the main part and the siphon cap can be achieved, for example, by sintering the siphon cap and the main part together. By sintering them together, a connection created by a thread between the main part and the siphon cap can be compressed or coupled together in such a way that the individual components are inseparably coupled to one another and, moreover, fit so tightly against one another that the ingress of melt between the components is prevented.

[0014] Furthermore, it can be provided that a connecting element is formed at the connecting end of the lance.

[0015] Furthermore, it can be provided that the siphon cap is made of aluminum titanate, and that the main part is made of aluminum titanate. This has the advantage that a lance designed in this way can have sufficiently high thermal resistance for transporting melt. Furthermore, the individual components made of aluminum titanate can be efficiently bonded to one another in a common sintering process. Furthermore, it can be provided that additional components are formed in a basic structure made of aluminum titanate. Such additional components can, for example, be mold inserts made of a different material.

[0016] In an alternative design variant, it is also conceivable for fiber materials to be embedded in the aluminum titanate base structure to increase tensile strength or reduce brittleness. Such fiber materials could be, for example, glass fiber or carbon fiber.

[0017] In addition, it can be provided that the siphon cap is screwed to the main part, wherein the siphon cap and the main part are sintered together, thus forming an inseparable connection between the siphon cap and the main part. This has the advantage that this measure can create a melt-tight connection between the siphon cap and the main part. An inseparable connection between the main part and the siphon cap can be achieved, for example, by sintering the siphon cap and the main part together. By sintering them together, a connection created by means of a thread between the main part and the siphon cap can be compressed or pressed in such a way that the individual components are inseparably coupled to one another and, moreover, fit so tightly against one another that the ingress of melt between the components is prevented.In particular, melt penetration into the thread area can be prevented. Preventing melt penetration can improve the longevity of the components, since melt entering between two components would exert such a force on the components upon solidification that they would be destroyed. The measures according to the invention thus ensure that no melt can penetrate into the gaps in the thread between the siphon cap and the main part, thereby preventing damage to or bursting of the lance due to solidifying melt.

[0018] Also advantageous is an embodiment according to which it can be provided that the siphon cap has a siphon cap base and an adjoining siphon cap shell, wherein at least one passage opening is formed in the siphon cap shell. This has the advantage that the melt can escape through the passage opening. In particular, it can be provided that the siphon cap base and the siphon cap shell form a pot shape or bowl shape. Furthermore, it can be provided that a plurality of the passage openings are formed distributed over the circumference. In particular, it can be provided that the passage openings are formed evenly distributed over the circumference. In particular, three of the passage openings can be formed evenly distributed over the circumference.

[0019] According to a further development, it is possible for the siphon cap shell to have a shell end wall on the side facing away from the siphon cap base, wherein the main part has a main part end wall, wherein the shell end wall abuts the main part end wall. This has the advantage that, due to the shell end wall abutting the main part end wall, a clear axial positioning of the siphon cap relative to the main part can be achieved. Furthermore, due to the shell end wall abutting the main part end wall, a melt-tight connection can be achieved between the siphon cap and the main part, thus preventing unwanted penetration of melt into the thread.

[0020] Furthermore, it may be expedient if a threaded section is formed on the main part, wherein the threaded section protrudes axially relative to the main part end wall, and a mating thread corresponding to the threaded section is formed on the siphon cap casing. A durable connection between the main part and the siphon cap can be established, particularly by means of such a threaded connection. In particular, the arrangement of the thread according to the invention can ensure good durability of the lance.

[0021] Furthermore, a siphon wall can be provided adjacent to the threaded section. This has the advantage that the siphon wall, together with the siphon cap, can form the siphon.

[0022] Furthermore, it can be provided that the siphon wall is formed coaxially with the siphon cap shell, with an annular gap being formed between the siphon wall and the siphon cap shell. This has the advantage that the annular gap can serve as a passage for melt. In particular, it can be provided that the annular gap is formed all the way around. In an alternative embodiment, it is also conceivable for webs to be formed on the outside of the siphon wall, so that the annular gap is designed in the form of a segmented annular gap. This can result in an increase in the strength properties.According to a particular embodiment, it is possible for the siphon to have a reservoir, wherein the reservoir is formed in the siphon cap, wherein the reservoir has an overflow level which is defined by the passage opening in the siphon cap casing, wherein the siphon wall has a siphon wall lower edge, wherein the siphon wall protrudes into the reservoir such that the siphon wall lower edge is arranged at a lower level than the overflow level. A siphon formed in this way in particular has the advantage of being simple in construction and thus easy and cost-effective to manufacture. Furthermore, such a siphon can have a robust and durable construction.

[0023] According to an advantageous development, it can be provided that the siphon cap jacket has a siphon cap outer diameter and that the main part has a main part outer diameter, wherein the siphon cap outer diameter is between 90% and 110%, in particular between 95% and 105%, preferably between 99% and 101% of the main part outer diameter. This has the advantage that the lance can have a continuous surface in the transition between the main part and the siphon cap, whereby any melt deposits at the transition between the main part and the siphon cap can be avoided. In particular, it can be provided that the main part is offset in the region of the main part end wall in such a way that this corresponds to the jacket thickness of the siphon cap jacket in order to achieve a functional part between the main part and the siphon cap in the assembled state.

[0024] In particular, it can be advantageous to have a flow guide element in the form of a centrally located protrusion on the base of the siphon cap. This has the advantage that the melt can be redirected in the area of ​​the siphon with as little turbulence as possible.

[0025] In particular, it can be provided that the flow guide element is designed in the form of a pyramid-like elevation with a rotationally symmetrical shape.

[0026] In particular, it can be provided that the main part is designed as a substantially rotationally symmetrical body. Furthermore, it can be provided that the siphon cap is designed as a substantially rotationally symmetrical body. Only the threaded sections in the main part or in the siphon cap can have a shape deviating from the rotationally symmetrical shape. Furthermore, it can be provided that the passage opening is arranged at a passage opening distance from the jacket end wall. Furthermore, it can be provided that the threaded section has a thread section length. The thread section length can be between 90% and 110%, in particular between 95% and 105%, preferably between 99% and 101% of the passage opening distance.

[0027] Furthermore, it can be provided that the distance between the lower edge of the siphon wall and the overflow level is between 100% and 1000%, in particular between 300% and 600%, preferably between 400% and 500% of the discharge height. This offers the advantage of improved flow behavior.

[0028] Furthermore, the passage opening can be inclined downwards from the horizontal at an outflow angle. The outflow angle can be between 1° and 60°, in particular between 10° and 30°, preferably between 15° and 25°.

[0029] Furthermore, it can be provided that the passage opening has a passage opening height. The passage opening height can be between 50% and 200%, in particular between 80% and 120%, preferably between 90% and 110% of the passage height.

[0030] Furthermore, it can be provided that the siphon cap is made of a material with a porous structure, wherein the porous structure has such coarse pores that the siphon cap is permeable to the melt when new. Such a siphon cap can be used for all of the described embodiments. This has the advantage that this measure not only allows the pouring opening to be used to discharge the melt, but that the melt can also flow out through the wall of the siphon cap. This can increase the amount of melt flowing out. Furthermore, such a siphon cap has the advantage that if the porous structure freezes over or becomes blocked, the pouring opening continues to function and the melt can still be discharged at least via the pouring opening.

[0031] Furthermore, the siphon cap can be made of foam ceramic. In particular, the foam ceramic can comprise silicon carbide. Such SiC foam ceramic filters are open-pore ceramic bodies made of SiC (silicon carbide). Foam ceramic filters have a foam-like structure, with pores that are permeable to melt. Their free cross-section depends on the pore size, which have approximately uniform dimensions.

[0032] According to the invention, a melt transport device is designed. The melt transport device comprises a melt container in which a melt receiving space is formed, and a lance coupled to the melt container, wherein the lance has a pouring opening that is fluidly connected to the melt receiving space.

[0033] Furthermore, a gas valve is provided, which is fluidly connected to the melt receiving chamber and is designed to regulate the gas input into the melt receiving chamber. The lance has a siphon. In particular, the lance is designed according to one of the above-mentioned embodiments.

[0034] According to an advantageous development, a plug can be provided, wherein the plug is designed to be displaceable on the melt container in a plug axial direction and serves to reduce an outflow cross-section in the melt container, wherein, in a closed position, a minimum outflow cross-section remains for the flow of melt. This has the advantage that the spout is not tightly closed by the plug, but the outflow amount of melt can be regulated. By maintaining a minimal outflow cross-section, displacement of the melt from the siphon during the displacement of the plug can be prevented, thereby improving the quality of the melt discharge.

[0035] In particular, it can be provided that the plug is arranged in the receiving space of the melt container and that the plug interacts with an opening of the melt container.

[0036] In an alternative design variant, the plug can also interact with a constriction in the lance.

[0037] In a further embodiment, it can be provided that the plug interacts with another component. The further component can be arranged between the lance and the melt container. In a first embodiment, it can be provided that the minimum outflow cross-section is achieved by arranging longitudinal grooves in the plug or in the melt container or in the further component or in the lance, wherein the longitudinal grooves allow the melt to flow even in the closed position. The longitudinal grooves are designed to be at least large enough that no capillary effect occurs and the melt is not held in the melt container by capillary action.

[0038] In a further embodiment, the minimum outflow cross-section can be achieved by positioning the plug in the closed position only close enough to the melt container, the other component, or the lance to form an annular gap that allows the melt to flow through. The annular gap is designed to be at least large enough to prevent capillary action and prevent the melt from being held in the melt container by capillary action.

[0039] The annular gap can be achieved by arranging the plug axially spaced from the counterpart component.

[0040] Alternatively, the annular gap can be achieved by having a plug with a smaller diameter than the opening in the mating component corresponding to the plug.

[0041] In particular, it may be advantageous if the plug is movably attached to the head unit by means of an actuator.

[0042] The melt transport device according to the invention offers the advantage that the main part and the siphon cap together form the siphon, whereby a corresponding internal geometry for forming the siphon can be easily realized by using individual components. In particular, the measures according to the invention make it possible for the individual components of the lance to be manufactured using a primary forming process, such as pressing a blank.

[0043] According to the invention, a method for producing a lance for a melt transport device is provided. The method comprises the following steps:

[0044] - Providing a green body of a main part;

[0045] - Providing a green body of a siphon cap; - Joining the green body of the main part and the green body of the siphon cap;

[0046] - Joint sintering of the green body of the main part and the green body of the siphon cap.

[0047] The method according to the invention has the advantage that the individual components of the lance can be easily manufactured.

[0048] Also advantageous is a method according to which it can be provided that after the green compact of the main part has been provided, this is mechanically machined, in particular provided with a threaded section, and that after the green compact of the siphon cap has been provided, this is mechanically machined, in particular provided with a counter thread, and that in order to join the green compact of the main part and the green compact of the siphon cap, these are screwed together. This has the advantage that the green compact can be easily machined. Furthermore, thanks to the threaded connection, the green compact of the main part can be easily connected to the green compact of the siphon cap and subsequently the two components can be sintered together in order to achieve a good connection between the two components.

[0049] For a better understanding of the invention, it is explained in more detail using the following figures.

[0050] They show in a highly simplified, schematic representation:

[0051] Fig. 1 is a schematic representation of a first embodiment of a melt transport device;

[0052] Fig. 2 is a perspective view of a first embodiment of a lance;

[0053] Fig. 3 is a longitudinal sectional view of the first embodiment of the lance;

[0054] Fig. 4 is a longitudinal sectional view of the first embodiment of a main part of the

[0055] Lance;

[0056] Fig. 5 is a longitudinal sectional view of the first embodiment of a siphon cap of the lance;

[0057] Fig. 6 is a cross-sectional view of another embodiment of the melt transport device; Fig. 7 is a cross-sectional view of another embodiment of the melt transport device.

[0058] By way of introduction, it should be noted that in the variously described embodiments, identical parts are provided with identical reference symbols or component designations. The disclosures contained throughout the description can be applied analogously to identical parts with identical reference symbols or component designations. Furthermore, the positional information chosen in the description, such as top, bottom, side, etc., refers to the directly described and illustrated figure, and these positional information must be applied analogously to the new position in the event of a change in position.

[0059] Fig. 1 shows a first embodiment of a melt transport device 1, which serves to transport melt 2.

[0060] The melt transport device 1 has a melt container 3 in which a melt receiving space 4 is formed, which serves to receive the melt 2.

[0061] Furthermore, the melt transport device 1 can comprise a lance 5, which is coupled to the melt container 3. The lance 5 can be interchangeably coupled to the melt container 3. In particular, it is conceivable for the lance 5 to be designed as a separate component, which is coupled to the melt container 3. The lance 5 has a pouring opening 6, through which the melt 2 held in the melt container 3 can flow out of the melt transport device 1 into a casting mold.

[0062] Furthermore, a gas valve 7 can be formed, which is fluidly connected to the melt receiving space 4 and which is designed to regulate a gas input into the melt receiving space 4.

[0063] Furthermore, it can be provided that a suction line 8 is formed, which can be coupled to a vacuum pump 9. The gas valve 7 can also be arranged in the region of the suction line 8 or be designed to allow gas to flow into the melt receiving chamber 4 in a targeted manner via the suction line 8.

[0064] As further shown in Fig. 1, the melt transport device 1 may be provided with a siphon 10. The siphon 10 may be arranged between the melt receiving space 4 and the pouring opening 6.

[0065] In particular, it can be provided that the siphon 10 is arranged on the underside of the lance 5.

[0066] Furthermore, it can be provided that a bottom flange 11 is formed, which can be welded to a casing 12 of the melt container 3. In particular, it can be provided that the bottom flange 11 is designed to receive a bottom cover 13. In particular, it can be provided that the bottom cover 13 is coupled to the bottom flange 11 by means of fastening means 14. Such fastening means 14 can be designed, for example, in the form of screws. In particular, it can be provided that a hole pattern in the form of through holes 15 is formed in both the bottom flange 11 and the bottom cover 13, which serve for the insertion of the fastening means 14.

[0067] Furthermore, it can be provided that a central recess 16 is formed in the base cover 13, which can serve as a passage for the melt 2. In particular, it can be provided that the lance 5 corresponds to the central recess 16 or is received therein. Furthermore, it can be provided that the lance 5 has a connecting element 17, which can be received in a depression 18 of the central recess 16. The connecting element 17 can bear against a contact surface 19 of the base cover 13. Thus, the lance 5 can be received in the base cover 13 in a form-fitting manner.

[0068] Figures 2 and 3 show a further and possibly independent embodiment of the lance 5, wherein the same reference numerals or component designations are used for the same parts as in the preceding Fig. 1. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Fig. 1.

[0069] As can also be seen from Fig. 1, a plug 57 can be provided, which can serve to reduce an outflow cross-section 60 in the melt container 3. In particular, it can be provided that the plug 57 is designed to be displaceable in a plug axial direction 58 relative to the melt container 3. The plug 57 can be displaced in the plug axial direction 58 by means of an actuator 59. In the illustration according to Fig. 1, the plug 57 is shown in its closed position. As can be seen from Fig. 1, an outflow cross-section 60 in the form of an annular gap can remain in the closed position of the plug 57. The annular gap can be achieved by making an inner diameter of the melt container 3 in the region of the outlet smaller than an outer diameter of the plug 57.

[0070] Fig. 2 shows the lance 5 in a perspective view. Fig. 3 shows the lance 5 in a longitudinal section. The structure of the lance 5 is described below using a combined view of Figures 2 and 3.

[0071] As can be seen from Figs. 2 and 3, the lance 5 can extend between a connection end 20 and the siphon 10. In particular, the connection element 17 can be formed at the connection end 20. The connection element 17 can, for example, be designed in the form of a collar or a flange.

[0072] Furthermore, it can be provided that a flow connection section 21 is formed between the connection end 20 and the siphon 10. The flow connection section 21 can form a flow connection channel 22. The flow connection channel 22 can serve to guide the melt 2. Furthermore, it can be provided that a tapered section 23 is formed between the flow connection section 21 and the connection end 20. This measure can achieve an inflow diameter 24 in the region of the connection end 20 that can be larger than a connection channel diameter 25 of the flow connection channel 22. This can result in improved inflow behavior into the lance 5.

[0073] As further evident from Figs. 2 and 3, the lance 5 can be provided with a main part 26 and a siphon cap 27. The main part 26 and the siphon cap 27 can be designed as structurally independent parts that are coupled to one another. In particular, the main part 26 and the siphon cap 27 can be inseparably coupled to one another. Furthermore, the siphon 10 can be formed by the interaction of the main part 26 with the siphon cap 27.

[0074] As further evident from Fig. 3, it can be provided that the flow connection section 21 is formed in the main part 26. Furthermore, it can be provided that the connection end 20 is formed in the main part 26. The main part 26 can have a main part outer diameter 28 in the region of the flow connection section 21. A flow connection section wall thickness 29 can result from the difference between the main part outer diameter 28 and the connecting channel diameter 25.

[0075] In particular, it can be provided that the flow connection section 21 is tubular.

[0076] As can be seen from Fig. 3, the siphon cap 27 can be provided with a siphon cap base 30 and a siphon cap shell 31. The siphon cap shell

[0077] 31 can be formed integrally with the siphon cap base 30. This can result in a pot-shaped structure or shape of the siphon cap 27.

[0078] Furthermore, it can be provided that a passage opening 32 is formed in the siphon cap casing 31. The passage opening 32 can serve to direct the melt 2 flowing in the flow connection channel 22 to the outside. In particular, it can be provided that the pouring opening 6 is formed in the passage opening 32.

[0079] As can be seen from Fig. 3, it can be provided that the siphon cap 27 forms a reservoir 33, which serves to hold the melt 2. Furthermore, it can be provided that a siphon wall 34 is formed in the main part 26 adjacent to the flow connection section 21. The siphon wall 34 can also be tubular. Furthermore, it can be provided that the siphon wall 34 has a siphon wall lower edge 35. In particular, it can be provided that the siphon wall 34 protrudes into the reservoir 33. The reservoir 33 can be increased in its capacity upwards by the passage opening

[0080] 32. In particular, it can be provided that an overflow level 36 is defined by the passage opening 32, wherein when the melt 2 rises above the overflow level 36, the melt 2 can flow outwards through the passage opening 32.

[0081] In particular, it can be provided that a lower edge of the passage opening 32 forms the overflow level 36. In particular, it can be provided that the lower edge 35 of the siphon wall is arranged below the overflow level 36, whereby the siphon effect can be achieved.

[0082] Furthermore, it can be provided that the siphon wall 34 has an outer siphon wall diameter 37. The siphon wall 34 can be designed such that the connecting channel diameter 25 or the flow connection channel 22 extends through the siphon wall 34. Thus, the siphon wall 34 can have a connecting channel diameter 25 on its inner side.

[0083] The siphon wall 34 can have a siphon wall thickness 38, which results from a difference between the siphon wall outer diameter 37 and the connecting channel diameter 25.

[0084] In particular, it can be provided that the siphon wall outer diameter 37 is smaller than the main part outer diameter 28. A threaded section 39 can be formed in the upper region of the siphon wall 34 or in the region of the connection of the siphon wall 34 to the flow connection section 21. The threaded section 39 can have an external thread. In particular, it can be provided that the threaded section 39 has a thread diameter 40. The thread diameter 40 can be smaller than the main part outer diameter 28. Furthermore, it can be provided that the thread diameter 40 is larger than the siphon wall outer diameter 37. Furthermore, it can be provided that a relief cut 41 is formed between the threaded section 39 and the flow connection section 21.

[0085] Because the thread diameter 40 can be smaller than the main part outer diameter 28, a step can be formed on the underside of the flow connection section 21. The step can have a main part end wall 42. In particular, it can be provided that the undercut 41 extends between the main part end wall 42 and in the threaded section 39. Furthermore, it can be provided that the siphon cap jacket

[0086] 31 has a jacket end wall 43 on its upper side. In particular, it can be provided that the jacket end wall 43 rests against the main part end wall 42. Thus, an axial positioning of the siphon cap 27 can be achieved.

[0087] Furthermore, it can be provided that the passage opening 32 is formed axially spaced from the casing end wall 43. In particular, it can be provided that the passage opening

[0088] 32 is arranged at a passage opening distance 44 from the jacket end wall 43. Furthermore, it can be provided that the threaded section 39 has a threaded section length 45. The threaded section length 45 and the passage opening distance 44 can be approximately the same. Furthermore, it can be provided that a counter thread 46 is formed in the siphon cap jacket 31 of the siphon cap 27, which counter thread corresponds to the threaded section 39. The counter thread 46 can be designed as an internal thread, which can also have the thread diameter 40.

[0089] Furthermore, it can be provided that the mating thread 46 has a mating thread section length 47. The mating thread section length 47 can be approximately the same as the thread section length 45 or as the distance 44 from the passage opening. Furthermore, it can be provided that the siphon cap 27 has a siphon cap outer diameter 48 and a siphon cap inner diameter 49 in the region of the siphon cap jacket 31. In particular, it can be provided that the siphon cap outer diameter 48 is approximately the same size as the main part outer diameter 28. Thus, a continuously variable outer shell of the lance 5 can be formed. Furthermore, it can be provided that the siphon cap inner diameter 49 is larger than the thread diameter 40. In particular, it can be provided that the siphon cap inner diameter 49 is larger than the siphon wall outer diameter 37.An annular gap 50 can be formed by the difference between the siphon cap inner diameter 49 and the siphon wall outer diameter 37. The annular gap 50 can have an annular gap width 51. The annular gap 50 can form part of the reservoir 33. Furthermore, the annular gap 50 can serve to connect the flow connection channel 22 to the passage opening 32 in the siphon cap casing 31.

[0090] As further evident from Fig. 3, a flow guide element 52 can be formed on an inner surface 53 of the siphon cap base 30. The flow guide element 52 can extend to a level of the lower edge 35 of the siphon wall.

[0091] Furthermore, it can be provided that the siphon cap base 30 has a siphon cap base inner surface 53. The flow guide element 52 can be arranged on the siphon cap base inner surface 53. Furthermore, it can be provided that the siphon cap base inner surface 53 is arranged at a passage height 54 relative to the siphon wall lower edge 35.

[0092] In Fig. 4, the main part 26 of the lance 5 is shown in a longitudinal section, wherein the same reference numerals or component designations are used for the same parts as in the preceding Figures 1 to 3. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 3.

[0093] In Fig. 5, the siphon cap 27 of the lance 5 is shown in a longitudinal section, wherein the same reference numerals or component designations are used for the same parts as in the preceding Figures 1 to 3. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 3.

[0094] As can be seen particularly clearly in Fig. 5, the passage opening 32 can be provided not to penetrate the siphon cap casing 31 straight, but rather to be inclined downwards at an outflow angle 55 from the horizontal. This measure can achieve improved flow behavior when the melt flows into a casting mold. Furthermore, the passage opening 32 can be provided with a passage opening height 56.

[0095] In Fig. 6, the melt transport device 1 is shown in a cross-sectional view, wherein the same reference numerals or component designations are used for the same parts as in the preceding Figures 1 to 5. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 5.

[0096] As can be seen from Fig. 6, it can be provided that a further component 61 is arranged between the melt container 3 and the lance 5. For the sake of clarity, the further component 61 is shown in perspective in a detailed view in Fig. 6.

[0097] The additional component 61 can be annular. Furthermore, it can be provided that the additional component 61 has an inner surface 62 into which the plug 57 extends. The inner surface 62 can thus correspond with the plug 57. Furthermore, it can be provided that longitudinal grooves 63 are formed on the inner surface 62, which form the outflow cross-section 60.

[0098] In Fig. 7, the melt transport device 1 is shown in a cross-sectional view, wherein the same reference numerals or component designations are used for the same parts as in the preceding Figs. 1 to 6. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figs. 1 to 6.

[0099] As can be seen from Fig. 7, it can be provided that the plug 57 is arranged at a distance from the melt container 3 in the closed position, so that the outflow cross-section 60 is obtained.

[0100] The embodiments show possible embodiments, whereby it should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but rather various combinations of the individual embodiments with each other are also possible and this possibility of variation lies within the skill of the person skilled in the art in this technical field due to the teaching of technical action by means of the objective invention.

[0101] The scope of protection is determined by the claims. However, the description and drawings must be used to interpret the claims. Individual features or combinations of features from the various embodiments shown and described may represent independent inventive solutions. The problem underlying these independent inventive solutions can be derived from the description.

[0102] All information on value ranges in this description is to be understood as including any and all sub-ranges thereof, e.g. the information 1 to 10 is to be understood as including all sub-ranges starting from the lower limit of 1 and the upper limit of 10, ie all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0103] For the sake of clarity, it should be noted that, for a better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced in size. Reference symbol list

[0104] Melt transport device 30 Siphon cap base Melt 31 Siphon cap shell

[0105] Melt container 32 passage opening

[0106] Melt receiving chamber 33 Reservoir

[0107] Lance 34 siphon wall

[0108] Pouring opening 35 Siphon wall bottom edge Gas valve 36 Overflow level

[0109] Suction line 37 siphon wall outer diameter

[0110] Vacuum pump 38 siphon wall thickness

[0111] Siphon 39 threaded section

[0112] Bottom flange 40 thread diameter

[0113] Coat 41 undercut

[0114] Floor cover 42 main part front wall

[0115] Fasteners 43 Shell end wall through hole 44 Passage opening s distance central recess 45 Thread section length

[0116] Connecting element 46 counter thread

[0117] Recess 47 Counter thread section length contact surface 48 Siphon cap outer diameter connection end 49 Siphon cap inner diameter

[0118] Flow connection section 50 Annular gap Flow connection channel 51 Annular gap width Tapered section 52 Flow guide element Inlet diameter 53 Siphon cap bottom inner surface

[0119] Connection channel diameter 54 Passage height main part 55 Outflow angle

[0120] Siphon cap 56 Opening height Main part outer diameter 57 Plug

[0121] Flow connection section 58 Plug axial direction wall thickness 59 Actuator - I9 Outlet cross section further component inner surface further component longitudinal groove

Claims

Patent claims 1. Lance (5) for a melt transport device (1), the lance (5) comprising: - a connection end (20) for connection to the melt transport device (1); - a siphon (10); - a tubular flow connection section (21) extending between the connection end (20) and the siphon (10) and forming a flow connection channel (22) between the connection end (20) and the siphon (10), characterized in that the lance (5) has a main part (26) and a siphon cap (27), wherein the main part (26) and the siphon cap (27) are each independent components which are coupled to one another, wherein the siphon (10) is formed by the interaction of the main part (26) and the siphon cap (27).

2. Lance (5) according to claim 1, characterized in that the siphon cap (27) is inseparably coupled to the main part (26).

3. Lance (5) according to claim 1 or 2, characterized in that the siphon cap (27) is formed from aluminum titanate and that the main part (26) is formed from aluminum titanate.

4. Lance (5) according to one of the preceding claims, characterized in that the siphon cap (27) is screwed to the main part (26), wherein the siphon cap (27) and the main part (26) are sintered together, and thereby an inseparable connection is formed between the siphon cap (27) and the main part (26).

5. Lance (5) according to one of the preceding claims, characterized in that the siphon cap (27) has a siphon cap base (30) and an adjoining siphon cap jacket (31), wherein at least one passage opening (32) is formed in the siphon cap jacket (31).

6. Lance (5) according to claim 5, characterized in that the siphon cap casing (31) has a casing end wall (43) on the side facing away from the siphon cap base (30). wherein the main part (26) has a main part end wall (42), wherein the jacket end wall (43) bears against the main part end wall (42).

7. Lance (5) according to claim 6, characterized in that a threaded portion (39) is formed on the main part (26), wherein the threaded portion (39) is formed to project axially relative to the main part end wall (42), wherein a counter-thread (46) corresponding to the threaded portion (39) is formed on the siphon cap jacket (31).

8. Lance (5) according to claim 7, characterized in that a siphon wall (34) is formed adjacent to the threaded section (39).

9. Lance (5) according to claim 8, characterized in that the siphon wall (34) is formed coaxially to the siphon cap shell (31), wherein an annular gap (50) is formed between the siphon wall (34) and the siphon cap shell (31).

10. Lance (5) according to one of claims 7 to 9, characterized in that the siphon (10) has a reservoir (33), wherein the reservoir (33) is formed in the siphon cap (27), wherein the reservoir (33) has an overflow level (36) which is defined by the passage opening (32) in the siphon cap casing (31), wherein the siphon wall (34) has a siphon wall lower edge (35), wherein the siphon wall (34) projects into the reservoir (33) in such a way that the siphon wall lower edge (35) is arranged at a lower level than the overflow level (36).

11. Lance (5) according to one of claims 5 to 10, characterized in that the siphon cap jacket (31) has a siphon cap outer diameter (48) and that the main part (26) has a main part outer diameter (28), wherein the siphon cap outer diameter (48) is between 90% and 110%, in particular between 95% and 105%, preferably between 99% and 101% of the main part outer diameter (28).

12. Lance (5) according to one of claims 5 to 11, characterized in that a flow guide element (52) in the form of a centrally arranged elevation is formed on the siphon cap base (30).

13. Lance (5) according to one of the preceding claims, characterized in that the siphon cap (27) is formed from a material with a porous structure, wherein the porous structure has such a coarse porosity that the siphon cap (27) is permeable to the melt (2) in the new state.

14. Melt transport device (1) comprising a melt container (3) in which a melt receiving space (4) is formed and a lance (5) which is coupled to the melt container (3), wherein the lance (5) has a pouring opening (6) which is fluidly connected to the melt receiving space (4), wherein a gas valve (7) is formed which is fluidly connected to the melt receiving space (4) and which is designed to regulate a gas introduction into the melt receiving space (4), characterized in that the lance (5) has a siphon (10), in particular that the lance (5) is designed according to one of the preceding claims.

15. Melt transport device (1) according to claim 14, characterized in that a plug (57) is formed, wherein the plug (57) is arranged on the melt container (3) so as to be displaceable in a plug axial direction (58) and serves to reduce an outflow cross-section (60) in the melt container (3), wherein in a closed position a minimum outflow cross-section (60) remains for the flow of melt (2).

16. A method for producing a lance (5) for a melt transport device (1), the method comprising the method steps: - providing a green body of a main part (26); - providing a green body of a siphon cap (27); - Joining the green part of the main part (26) and the green part of the siphon cap (27); - Joint sintering of the green body of the main part (26) and the green body of the siphon cap (27).

17. Method according to claim 16, characterized in that after the provision of the green body of the main part (26), this is mechanically machined, in particular provided with a threaded section (39), and that after the provision of the green body of the Siphon cap (27) is mechanically machined, in particular is provided with a counter thread (46), and that in order to join the green part of the main part (26) and the green part of the siphon cap (27) these are screwed together.

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