Melt transportation device

Abstract

The invention relates to a melt transportation device (1) comprising a melt container (3) in which a melt-receiving space (4) is formed and an outlet (5) which is coupled to the melt container (3), wherein the outlet (5) has an outlet opening (6) which is fluidically connected to the melt-receiving space (4). A gas valve (7) is also provided, which is fluidically connected to the melt-receiving space (4) and which is designed for controlling the entry of gas into the melt-receiving space (4).

Description

[0001] MELT TRANSPORT DEVICE The invention relates to a melt transport device. DE 102007011253 A1 discloses a casting device with a melt container for metallic materials. An injector is arranged on the underside of the melt container, which injector has an opening for discharging the melt. Furthermore, a closing device is formed, which serves to close the opening. The casting device known from DE 102007011253 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 method 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 process also has 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. All of this leads to the production of inferior cast workpieces. 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. This object is achieved by a device and a method according to the claims.The invention relates to a melt transport device comprising a melt container in which a melt receiving space is formed and a spout which is coupled to the melt container, wherein the spout has a pouring opening which is fluidly connected to the melt receiving space. Furthermore, a gas valve is formed which is fluidly connected to the melt receiving space and which is designed to regulate the introduction of gas into the melt receiving space. Furthermore, it can be expedient if the melt container has a gas-tight outer shell, wherein a melt receiving vessel is arranged within the gas-tight outer shell, wherein the melt receiving vessel is formed from a first material and the outer shell is formed at least in sections from a second material, wherein the first material and the second material have different material properties from one another.A structural separation of the gas-tight outer shell and the melt receiving vessel offers the advantage that the outer shell and the melt receiving vessel can have different mechanical properties. Thus, the melt receiving vessel can be made of a material designed for high temperatures or for holding a liquid melt. The melt receiving vessel only needs to absorb low mechanical forces. In particular, it can be provided that the mechanical forces are absorbed in the gas-tight outer shell or transferred to it. In addition, the gas-tight outer shell can be made of a material that is easy to weld, thus enabling gas-tight welding of the individual components.In particular, it can be provided that the gas-tight outer shell serves to accommodate the melt receiving vessel, wherein the melt receiving vessel is placed in the gas-tight outer shell and the weight of the melt receiving vessel acts in the form of a tensile force on the gas-tight outer shell. Furthermore, it can be provided that the second material of the outer shell comprises a metallic material, in particular a steel material, and / or that the first material of the melt receiving vessel comprises a fiber-reinforced material, in particular a glass-fiber-reinforced material. This has the advantage that a steel material has good weldability. Furthermore, a steel material is well suited to absorbing tensile forces. A glass-fiber-reinforced material can, with sufficient strength, have high temperature resistance and can thus be well suited to absorbing melt.Furthermore, it can be provided that the glass fiber reinforced material of the melt receiving vessel comprises a calcium silicate, a quartz glass, a silicon carbide or a zirconium silicate. In particular, it can be provided that glass fibers are embedded in a base material made of calcium silicate, a quartz glass, a silicon carbide or a zirconium silicate. Furthermore, it can be provided that the outer shell comprises a jacket and a bottom flange, wherein the jacket is coupled, in particular welded, to a bottom flange. This has the advantage that the bottom flange can be used to connect additional components. In particular, it can be provided that the jacket is formed from a steel sheet. The steel sheet can be wound into a thin-walled hollow cylinder.In particular, it can be provided that the hollow cylinder has an axial weld seam, by means of which a first longitudinal end and a second longitudinal end of the wound steel sheet are welded together. Another advantageous embodiment is according to which it can be provided that the outer shell comprises a bottom cover which is detachably coupled to the bottom flange by means of fastening means. This measure can ensure that the interior of the gas-tight outer shell is easily accessible by loosening and removing the bottom cover. This allows the melt container to be easily replaced or the melt container to be easily accessible when required. Furthermore, this measure can ensure that the melt container can be supported on the bottom cover or that the bottom cover can serve to receive and hold the melt container.Furthermore, it can be provided that a seal is arranged between the base cover and the base flange. In particular, it can be provided that the seal is in the form of a graphite seal. All seals of the outer shell can be in the form of a graphite seal. According to a further development, it is possible for the spout to be designed as a lance, wherein the lance is positively received in a central recess in the base cover. This has the advantage that the lance can be arranged on the melt container in an easily replaceable manner or can be coupled to it. Furthermore, it can be expedient if the lance has a connecting element and for the melt receiving vessel to have a contact surface, wherein the connecting element is pressed against the contact surface by means of the base cover. This measure can achieve a simple coupling or connection of the lance to the melt receiving vessel.Furthermore, it can be provided that a seal is arranged between the connection element and the contact surface. In particular, it can be provided that the seal is in the form of a graphite seal. Furthermore, it can be provided that the melt receiving vessel is preloaded in the direction of the base cover by means of spring elements. This has the advantage that this measure can ensure that the contact surface of the melt receiving vessel is pressed against the connection element of the lance with a specific preload force, whereby a tight connection can be achieved between the connection element of the lance and the contact surface of the melt receiving vessel. Furthermore, this measure can ensure that the melt receiving vessel is securely held within the outer shell.In addition, the use of spring elements can compensate for different thermal expansions of the melt receiving vessel and the outer shell in order to avoid damage to the melt container when receiving melt. A spring element within the meaning of this document can, for example, be a steel spring or, more generally, a resilient material. A spring element within the meaning of this document can also be a pneumatic spring. As an alternative to the use of a spring element, it is also conceivable for an actuator, such as a pneumatic cylinder, to serve to preload the melt receiving vessel. Furthermore, it can be provided that the outer shell comprises a head unit, wherein the head unit is coupled to the casing, in particular welded. In particular, it can be provided that the head unit serves to accommodate essential components, such as a gas valve, etc.Furthermore, it can be provided that the head unit serves to connect the melt container to a manipulation device, such as a manipulation robot. According to a particular embodiment, it is possible for the spring elements to be supported on the head unit. According to an advantageous further development, it can be provided that a plug is formed, wherein the plug is designed to be displaceable on the melt container in a plug axial direction and serves to close the spout. This has the advantage that the spout can be closed by means of the plug or the outflow amount of melt can be regulated. In particular, it can be provided that the plug is arranged in the receiving space of the melt receiving vessel and that the plug interacts with an opening of the melt receiving vessel.In an alternative embodiment, it can also be provided that the plug interacts with a constriction in the lance or with another component. In particular, it can be advantageous if the plug is slidably attached to the head unit by means of an actuator. This has the advantage that when the melt receiving vessel is replaced, the plug can remain on the head unit of the outer shell. This achieves the simplest possible construction and easy replaceability of the melt receiving vessel. Furthermore, it can be provided that the plug has a heating element arranged in the plug. This has the advantage that this measure can largely prevent the melt from freezing on the plug.Furthermore, it can be provided that the plug has an outer wall, wherein an embedding powder, in particular a magnesium oxide powder, is accommodated within the outer wall, wherein the heating element is embedded in the embedding powder. Such a design has the advantage that these measures allow the heating element to be accommodated in the plug, wherein the high temperature fluctuations during the casting process do not lead to damage to the heating element. Also advantageous is a design according to which it can be provided that the heating element is coupled to a power supply cable, wherein the power supply cables are guided freely between the head unit and the plug in such a way that relative movement of the plug to the head unit is possible. This has the advantage that this measure allows the electrical power required for operating the heating elements to be transported to the heating elements.In an alternative embodiment, sliding contacts for power transmission can be provided between the head unit and the plug. Furthermore, the power supply cable can be sheathed with heat-resistant electrical insulation, wherein the insulation is designed for maximum temperatures between 900°C and 250°C. A connecting element within the meaning of this document is advantageously a flange, but can also be designed as a conical shaped element. The sealing force required for the tightness of the lance on the melt receiving vessel is applied via the connecting element. Furthermore, the geometric position, such as coaxiality, position of the outlet opening relative to the receptacle of the melt transport device can be defined by the connecting element. This ensures easy replacement of the melt transport device.For a better understanding of the invention, it is explained in more detail with reference to the following figures. They show, in a highly simplified, schematic representation: Fig. 1 a schematic representation of a first embodiment of a melt transport device; Fig. 2 a sectional view of an embodiment of a plug; Fig. 3 a cross-sectional view of the plug along the section line II-II from Fig. 2; Fig. 4 a perspective view of a first embodiment of a bottom cover; Fig. 5 a further embodiment of a connection of a lance to the melt receiving vessel; Fig. 6 a further embodiment of a melt transport device with two lances; Fig. 7 a further embodiment of a melt transport device with two lances and two separate gas-tight chambers. By way of introduction, it should be noted that in the differently described embodiments, identical parts have the same reference numerals orthe same component designations, whereby the disclosures contained in the entire description can be transferred mutatis mutandis to identical parts with the same reference numerals or the same component designations. The position information chosen in the description, such as top, bottom, side, etc., also relates to the directly described and illustrated figure, and these position information are to be transferred mutatis mutandis to the new position in the event of a position change. Fig. 1 shows a first embodiment of a melt transport device 1, which serves to transport melt 2. 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. Furthermore, the melt transport device 1 can comprise a spout 5, which is coupled to the melt container 3. The spout 5 can be designed as an integral part of the melt container 3.Furthermore, it is also conceivable for the spout 5 to be designed as a separate component which is coupled to the melt container 3. The spout 5 has a spout opening 6, through which the melt 2 received in the melt container 3 can flow out of the melt transport device 1 into a casting mold. Furthermore, a gas valve 7 can be formed, which is fluidly connected to the melt receiving space 4 and which is designed to regulate the introduction of gas into the melt receiving space 4. The gas valve 7 is arranged above a maximum filling level 8 so that no melt 2 can flow into the gas valve 7. The maximum filling level is selected such that, when the melt container 3 is filled with melt 2 up to the maximum filling level 8, a gas-filled space remains in the melt receiving space 4, in which a pressure can be adjusted using the gas valve 7.Furthermore, a pressure detection means 9 can be provided, by means of which an internal pressure in the melt receiving chamber 4 can be detected. Thus, the gas pressure in the melt receiving chamber 4 can be specifically adjusted by the gas valve 7. Furthermore, it can be provided that a suction line 10 is formed, which can be coupled to a vacuum pump 11. The gas valve 7 can also be arranged in the region of the suction line 10 or be designed to allow gas to flow specifically into the melt receiving chamber 4 by means of the suction line 10. As can also be seen from Fig. 1, it can be provided that the melt transport device 1 has a siphon 12. The siphon 12 can be arranged between the melt receiving chamber 4 and the pouring opening 6. As can also be seen from Fig. 1, it can be provided that the pouring opening 5 is in the form of a lance 13. The siphon 12 can be arranged on the underside of the lance 13. As can be seen from Fig.1, it can be provided that the melt container 3 has a gas-tight outer shell 14. A melt receiving vessel 15 can be arranged within the gas-tight outer shell 14, which can serve to receive the melt 2. In particular, it can be provided that the melt receiving vessel 15 is in the form of a crucible, wherein the melt receiving space 4 is defined or delimited by the melt receiving vessel 15. Furthermore, it can be provided that the melt receiving vessel 15 has an outlet opening 16, which can be arranged in the lower region of the melt receiving vessel 15. In particular, it can be provided that the outlet opening 16 is designed as a central opening in the melt receiving vessel 15. In particular, it can be provided that a vacuum can be created within the outer shell 14 in order to be able to allow the melt 2 to flow out of the melt receiving space 4 in a controlled manner.in order to be able to suck the melt 2 into the melt receiving space 4. As can be seen particularly well from Fig. 1, it can be provided that the outlet opening 16 is formed in a base 17 of the melt receiving vessel 15. The base 17 of the melt receiving vessel 15 can be conical in this case, so that when the melt level drops, the melt 2 is guided to the outlet opening 16. As can also be seen from Fig. 1, it can be provided that the melt receiving vessel 15 is open at the top. In a variant embodiment not shown, it can be provided that a splash guard is formed on an upper side of the melt receiving vessel 15. Furthermore, it can be provided that the outer shell 14 has a jacket 18. The jacket 18 can be coupled to a head unit 19. In particular, it can be provided that the jacket 18 is welded to the head unit 19.In a first embodiment, it can be provided that the casing 18 is rolled from a flat sheet metal into a hollow cylinder, wherein the mutually facing ends of the rolled sheet metal can be welded together by means of a weld seam. Furthermore, it can be provided that a base flange 20 is formed, which is welded to the casing 18. In particular, it can be provided that the base flange 20 is designed to receive a base cover 21. In particular, it can be provided that the base cover 21 is coupled to the base flange 20 by means of fastening means 22. Such fastening means 22 can be designed, for example, in the form of screws. In particular, it can be provided that both the base flange 20 and the base cover 21 have a hole pattern in the form of through holes 23, which serve for the insertion of the fastening means 22.Furthermore, it can be provided that a central recess 24 is formed in the base cover 21, which can serve as a passage for the melt 2. In particular, it can be provided that the lance 13 corresponds to the central recess 24. Furthermore, it can be provided that the lance 13 has a connecting element 25, which can be received in a depression 26 in the central recess 24. The connecting element 25 can bear against a contact surface 27 of the melt receiving vessel 15. Furthermore, it can be provided that a spring element 29 is arranged between the head unit 19 and an upper side 28 of the melt receiving vessel 15. In particular, it can be provided that several of the spring elements 29 are arranged distributed over the circumference between the head unit 19 and the melt receiving vessel 15. The spring elements 29 serve to press the melt receiving vessel 15 against the bottom cover 21. As can be seen from Fig.1, it can be provided that a plug 30 is formed, which can serve to close the outlet opening 16. In particular, it can be provided that the plug 30 is designed to be displaceable in a plug axial direction 31 relative to the melt receiving vessel 15. The plug 30 can be displaceable in the plug axial direction 31 by means of an actuator 32. Furthermore, it can be provided that a heating element 33 is arranged in the plug 30, which is designed to heat the plug 30. In particular, it can be provided that the heating element 33 is coupled to a power supply cable 34, which serves to transmit the electrical energy for heating the heating element 33. The power supply cable 34 can be arranged on the head unit 19. As can also be seen from Fig. 1, it can be provided that a vessel holder 47 is arranged on an underside of the outer shell 14. The vessel holder 47 can be used to hold orserve to hold the melt receiving vessel 15 when the bottom cover 21 is removed from the outer shell 14 to replace the lance 13. In particular, it can be provided that the vessel holder 47 is formed parallel to the bottom cover 21. Fig. 2 shows a sectional view of an embodiment of the plug 30. Fig. 3 shows the corresponding cross-sectional view along the section line III - III from Fig. 2. In the illustration of Figures 2 and 3, the plug 30 is shown in its closed position, so that it projects into the outlet opening 16. As can be seen from Fig. 3, it can be provided that the plug 30 has an outer wall 35, which can be of hollow cylindrical design. A rod-shaped heating element 33 can be received within the outer wall 35. Furthermore, it can be provided that an embedding powder 36 is formed between the outer wall 35 and the rod-shaped heating element 33.The embedding powder 36 can serve to compensate for temperature-related thermal expansion between the outer wall 35 and the heating element 33. As can be seen particularly well in Fig. 3, the plug 30 can have an outer diameter 37. The outlet opening 16 can have an inner diameter 38. In particular, the outer diameter 37 of the plug 30 can be smaller than the inner diameter 38 of the outlet opening 16. This can create an annular gap 39 between the plug 30 and the inner wall of the outlet opening 16. The provision of the annular gap 39 serves to ensure that the plug 30 can be inserted into the outlet opening 16 or can close it without touching the melt receiving vessel 15. Fig. 4 shows a first embodiment of the bottom cover 21. As can be seen from Fig. 4, it can be provided that the bottom cover 21 has a depression 40 in the region of the central recess 24.The depression 40 can be designed such that the connection element 25 of the lance 13 can be received therein in a form-fitting manner. In particular, it can be provided that, in the installed state of the base cover 21, the depression 40 is formed on an upper side or facing the melt receiving space 4. Furthermore, it can be provided that tabs 41 are formed, in which the through-holes 23 are arranged. The tabs 41 can be designed to protrude radially outwards. As can also be seen from Fig. 4, it can be provided that a step 42 is formed which corresponds to the base flange 20. The step 42 allows the base cover 21 to be received centrally in the base flange 20. In particular, it can be provided that a first sealing groove 43 is formed in the region of the step 42. The first sealing groove 43 can be formed in an axial end face of the step 42 and serve to accommodate the axial seal.Furthermore, it can be provided that a second sealing groove 44 is formed in the step 42. The second sealing groove 44 can be arranged in a circumferential surface of the step 42 and serve to accommodate a radial seal. As can also be seen from Fig. 4, it can be provided that recesses 45 are formed in the base cover 21. The recesses 45 can serve to reduce the weight of the base cover 21. In particular, it can be provided that webs 46 are formed between the recesses 45. Fig. 5 shows a sectional view of a further embodiment of a detail for connecting the lance 13 to the melt receiving vessel 15, wherein again the same reference numerals or component designations as in the preceding Figures 1 to 4 are used for the same parts. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 4. As can be seen from Fig.5, it can be provided that a fastening nozzle 48 of the melt receiving vessel 15 protrudes through the base cover 21. In this case, it can be provided that a shoulder is formed in the melt receiving vessel 15, which corresponds to the step 42 in the base cover 21. This step, together with the step 42, can serve for the axial positioning of the melt receiving vessel 15. Furthermore, it can be provided that an external thread is formed on the fastening nozzle 48, which serves to interact with a union nut 49. The union nut 49 can serve to hold the lance 13 on the melt receiving vessel 15. In particular, it can be provided that the union nut 49 has a retaining ring 50, which engages in a form-fitting manner with the connecting element 25, whereby the connecting element 25 is pressed against the contact surface 27 by means of the union nut 49.In particular, it can be provided that a first seal 51 is arranged between the connecting element 25 and the contact surface 27. Furthermore, it can be provided that a second seal 52 is arranged between the retaining ring 50 of the union nut 49 and the connecting element 25 of the lance 13. Furthermore, it can be provided that a third seal 53 is arranged between the union nut 49 and the base cover 21. In particular, it can be provided that when the union nut 49 is screwed on or when the lance 13 is fastened, a seal is achieved between the lance 13 and the melt receiving vessel 15, between the lance 13 and the union nut 49 and between the union nut 49 and the base cover 21. Thus, on the one hand, a melt-tight connection can be achieved between the lance 13 and the melt receiving vessel 15. On the other hand, this measure can achieve a gas-tight connection of the outer shell 14.This allows a negative pressure to be generated in the melt receiving space 4. Fig. 6 shows a further embodiment of the melt transport device 1, wherein again the same reference numerals or component designations as in the preceding Figures 1 to 5 are used for the same parts. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 5. As can be seen from Fig. 6, it can be provided that a first lance 13a and a second lance 13b are formed. Furthermore, it can be provided that a first melt receiving vessel 15a and a second melt receiving vessel 15b are formed. The two melt receiving vessels 15a and 15b can both be arranged within the outer shell 14. Furthermore, it can be provided that the lances 13a and 13b are each cranked and can be pivoted about a vertical axis relative to the outer shell 14.The vertical axis can be in the center of the connection of 13a and 13b to the melt receiving vessel 15a and 15b. This measure makes it possible to adjust the distance between the two pouring openings 6a and 6b of the two lances 13a and 13b relative to one another. Fig. 7 shows a further embodiment of the melt transport device 1, wherein again the same reference numerals or component designations are used for the same parts as in the preceding Figures 1 to 6. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 to 6. As can be seen from Fig. 7, it can be provided that the first lance 13a and the second lance 13b are formed.Furthermore, it can be provided that the first melt receiving vessel 15a and the second melt receiving vessel 15b are formed and the lances 13a and 13b are each assigned to the associated melt receiving vessel 15a and 15b. The two melt receiving vessels 15a and 15b can both be arranged within the outer shell 14. As can also be seen from Fig. 7, it can be provided that the first melt receiving vessel 15a and the second melt receiving vessel 15b are each accommodated in a separate chamber. Thus, the first melt receiving vessel 15a and the second melt receiving vessel 15b can be subjected to a different negative pressure in order to be able to control the casting process differently. In particular, different melts can be accommodated in the first melt receiving vessel 15a and the second melt receiving vessel 15b. As can be seen from Fig.As can be seen from Figure 7, it can be provided that the pouring openings 6a and 6b of the two lances 13a and 13b are arranged at different heights. The exemplary embodiments show possible embodiments, whereby it should be noted at this point that the invention is not restricted to the specifically illustrated embodiments thereof, but rather various combinations of the individual embodiments with one another are also possible and that 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 based on the invention in question. The scope of protection is determined by the claims. However, the description and the drawings must be used to interpret the claims. Individual features or combinations of features from the different exemplary embodiments shown and described can represent independent inventive solutions in themselves.The problem underlying the independent inventive solutions can be taken from the description. 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 at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10. For the sake of clarity, it should be pointed out that, for the sake of better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced.

[0002] Reference symbol list Melt transport device 30 Plug Melt 31 Plug axial direction Melt vessel 32 Actuator Melt receiving chamber 33 Heating element Spout 34 Power supply cable Spout opening 35 Outer wall Gas valve 36 Investment powder Filling level maximum 37 Outer diameter Plug Pressure sensing device 38 Inner diameter Outlet opening Suction line 39 Annular gap Vacuum pump 40 Counterbore Siphon 41 Tab Lance 42 Stepped outer shell 43 First sealing groove Melt receiving vessel 44 Second sealing groove Outlet opening 45 Recess Base Melt receiving vessel 46 Web Jacket 47 Vessel holder Head unit 48 Fastening piece Base flange 49 Union nut Base cover 50 Retaining ring Fastening device 51 First seal Through hole 52 Second seal Central recess 53 Third seal Connection element Recess Contact surface Top Melt receiving vessel Spring element

Claims

Patent claims 1. Melt transport device (1) comprising a melt container (3) in which a melt receiving chamber (4) is formed and a spout (5) which is coupled to the melt container (3), wherein the spout (5) has a spout opening (6) which is fluid-connected to the melt receiving chamber (4), characterized in that a gas valve (7) is formed which is fluid-connected to the melt receiving chamber (4) and which is designed to regulate a gas input into the melt receiving chamber (4). 2.Melt transport device (1) according to claim 1, characterized in that the melt container (3) has a gas-tight outer shell (14), wherein a melt receiving vessel (15) is arranged inside the gas-tight outer shell (14), wherein the melt receiving vessel (15) is formed from a first material and the outer shell (14) is formed at least partially from a second material, wherein the first material and the second material have different material properties.

3. Melt transport device (1) according to claim 2, characterized in that the second material of the outer shell (14) comprises a metallic material, in particular a steel material, and / or that the first material of the melt receiving vessel (15) comprises a fiber-reinforced material, in particular a glass fiber-reinforced material. 4.Melt transport device (1) according to claim 2 or 3, characterized in that the outer casing (14) comprises a shell (18) and a bottom flange (20), wherein the shell (18) is coupled to a bottom flange (20), in particular by welding.

5. Melt transport device (1) according to claim 4, characterized in that the outer casing (14) comprises a bottom cover (21) which is detachably coupled to the bottom flange (20) by means of fastening means (22).

6. Melt transport device (1) according to claim 5, characterized in that the spout (5) is designed as a lance (13), wherein the lance (13) is positively engaged in a central recess (24) in the bottom cover (21).

7. Melt transport device (1) according to claim 6, characterized in that the lance (13) has a connecting element (25) and that the melt receiving vessel (15) has a contact surface (27), wherein the connecting element (25) is pressed against the contact surface (27) by means of the bottom cover (21).

8. Melt transport device (1) according to claim 7, characterized in that the melt receiving vessel (15) is biased towards the bottom cover (21) by means of spring elements (29).

9. Melt transport device (1) according to one of claims 4 to 8, characterized in that the outer shell (14) comprises a head unit (19), wherein the head unit (19) is coupled to the shell (18), in particular welded. 10.Melt transport device (1) according to claims 8 and 9, characterized in that the spring elements (29) are supported on the head unit (19).

11. Melt transport device (1) according to any one of the preceding claims, characterized in that a plug (30) is formed, wherein the plug (30) is slidably formed on the melt container (3) in a plug axial direction (31) and serves to close the spout (5).

12. Melt transport device (1) according to claims 9 and 11, characterized in that the plug (30) is slidably fixed to the head unit (19) by means of an actuator (32).

13. Melt transport device (1) according to claim 11, characterized in that the plug (30) has a heating element (33) arranged in the plug (30).

14. Melt transport device (1) according to claim 11 or 12, characterized in that the plug (30) has an outer wall (35) wherein an embedding powder (36), in particular a magnesium oxide powder, is contained within the outer wall (35), wherein the heating element (33) is embedded in the embedding powder (36).

15. Melt transport device (1) according to claim 12 and one of claims 13 to 14, characterized in that the heating element (33) is coupled with power supply cables (34), wherein the power supply cables (34) are guided freely between the head unit (19) and the plug (30) such that relative movement of the plug (30) to the head unit (19) is enabled.

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