Integrated taper graphite mould suitable for copper crystallizer

Abstract

This utility model discloses an integrated tapered graphite mold suitable for copper crystallizers, comprising a tapered graphite mold, wherein the tapered graphite mold is a cylindrical body with a tapered shape, the outer diameter of the lower end of the tapered graphite mold is larger than the outer diameter of the upper end of the tapered graphite mold, and the inner cavity of the tapered graphite mold is designed as a micro-tapered cylinder; a straight-cylinder copper crystallizer; and a high-temperature sealing component. This application, by designing an integrated tapered graphite mold, in conjunction with a straight-cylinder copper crystallizer and a high-temperature sealing module, can provide a self-lubricating and guiding effect on the molten copper during the copper rod drawing process, preventing premature solidification of the molten copper, thereby reducing the intense friction between the copper rod and the inner wall of the graphite, and preventing severe wear inside the graphite. This innovative design can not only significantly improve the production quality of copper rods and reduce the generation of defects such as surface cracks, but also increase the drawing speed, thereby greatly improving production efficiency and bringing significant economic benefits and technical advantages to the production of copper and copper alloy rods.

Description

Technical Field

[0001] This utility model belongs to the field of oxygen-free copper rod production technology, specifically relating to an integrated tapered graphite mold suitable for copper crystallizers. Background Technology

[0002] In the production of copper and copper alloy bars, the upward continuous casting technology occupies a core position. It is a key process for producing oxygen-free copper bars and copper alloy bars. The core equipment that this technology relies on mainly consists of graphite molds and water-cooled copper crystallizers, which work together to achieve continuous casting of copper bars.

[0003] In traditional assembly methods, one end of the graphite mold is immersed in molten copper to allow the copper to flow smoothly into the mold for molding; the other end is directly fixed to the water-cooled copper crystallizer via flat end-face bonding or rigid threaded connection. However, this seemingly conventional structural design has a fundamental flaw, which has a serious negative impact on the production quality and efficiency of copper rods: First, the problem of uncontrolled heat conduction is extremely prominent. Under the action of circulating cooling water, the water-cooled copper crystallizer can always maintain a low temperature of about 20-40℃, which is far below the freezing point of copper, 1083℃. Graphite molds have high thermal conductivity, usually between 80-120W / (m·K). When the graphite mold is in direct contact with the water-cooled copper crystallizer, the cooling energy of the crystallizer will be rapidly conducted to the graphite mold through the contact interface. According to actual measurement data, the temperature of the graphite mold 3-5cm away from the connection surface will drop sharply from above 800℃ to below 200℃. This rapid temperature change makes the temperature field distribution inside the graphite mold extremely uneven, which seriously interferes with the solidification process of the copper liquid. Secondly, premature solidification of molten copper occurs frequently. Due to the low temperature of the graphite mold, the molten copper solidifies prematurely inside. During the drawing process of the copper rod, there will be severe friction between the solid copper rod and the inner wall of the graphite mold. This friction not only increases the drawing resistance, making the drawing process difficult, but the large drawing resistance can also easily cause periodic cracks on the surface of the copper rod. In actual production, in order to avoid generating too many drawing cracks, it is necessary to reduce the drawing speed. However, reducing the drawing speed will lead to a significant decrease in production efficiency, which cannot meet the needs of large-scale production.

[0004] Furthermore, copper rods produced using the traditional graphite mold and copper crystallizer continuous casting method exhibit obvious periodic cracks on their surface. During the casting process, due to the intense friction between the copper rod and the inner surface of the graphite, severe wear occurs inside the graphite. This wear further increases the casting resistance, creating a vicious cycle that not only seriously affects the production quality of the copper rods but also greatly limits the improvement of production efficiency. Therefore, this utility model proposes an integrated tapered graphite mold suitable for copper crystallizers. Utility Model Content

[0005] The purpose of this invention is to provide an integrated tapered graphite mold suitable for copper crystallizers, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an integrated tapered graphite mold suitable for copper crystallizers, comprising... A conical graphite mold, wherein the conical graphite mold is a cylinder with a taper, the outer diameter of the lower end of the conical graphite mold is larger than the outer diameter of the upper end of the conical graphite mold, and the inner cavity of the conical graphite mold is designed as a micro-tapered cylinder, and a graphite filter screen is also provided in the inner cavity of the conical graphite mold. A straight-cylinder copper crystallizer, wherein the inner cavity of the straight-cylinder copper crystallizer is a smooth cylindrical tube of equal diameter, and the top of the conical graphite mold is inserted into the inner side of the straight-cylinder copper crystallizer, and the lower section of the conical graphite mold is immersed in the copper liquid; A high-temperature sealing assembly is disposed between a conical graphite mold and a straight-cylinder copper crystallizer.

[0007] Preferably, the high-temperature sealing assembly includes an axial compression structure and a sealing ring. The bottom inner wall of the straight cylindrical copper crystallizer is provided with an annular bottom groove for the installation of the sealing ring. The sealing ring is embedded in the annular bottom groove, and the inner wall of the sealing ring is in extrusion contact with the outer wall of the conical graphite mold.

[0008] Preferably, the axial clamping structure includes a stainless steel threaded pressure ring rotatably sleeved on the outer wall of the conical graphite mold, and the top end of the stainless steel threaded pressure ring is threadedly connected to the straight cylindrical copper crystallizer.

[0009] Preferably, the outer wall of the conical graphite mold is provided with an integral annular shoulder, and the bottom inner wall of the stainless steel threaded pressure ring is provided with an annular guide groove that matches the annular shoulder, and the annular shoulder is located in the annular guide groove.

[0010] Preferably, the outer wall of the top end of the stainless steel threaded pressure ring has a plurality of integral strip-shaped protrusions evenly distributed.

[0011] Preferably, the bottom outer wall of the straight-cylinder copper crystallizer is provided with an external thread, and the thread on the inner wall of the stainless steel threaded pressure ring is engaged with the external thread.

[0012] Preferably, the outer wall of the straight-cylinder copper crystallizer is provided with a spiral cooling water channel above the external thread, and the straight-cylinder copper crystallizer is made of chromium-zirconium copper alloy.

[0013] Preferably, the outer wall of the sealing ring is provided with an integral annular outer locking block, and the inner wall of the annular bottom groove is provided with an annular inner locking groove for the annular outer locking block to be inserted.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This application designs an integrated tapered graphite mold, which, together with a straight-cylinder copper crystallizer and a high-temperature sealing module, can play a self-lubricating guiding role for the copper liquid during the copper rod drawing process, preventing the copper liquid from solidifying too early, thereby reducing the severe friction between the copper rod and the inner wall of the graphite and preventing serious wear inside the graphite. This innovative design can not only significantly improve the production quality of copper rods and reduce the generation of defects such as surface cracks, but also increase the drawing speed, thereby greatly improving production efficiency and bringing significant economic benefits and technical advantages to the production of copper and copper alloy rods. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This utility model Figure 2 A magnified view of a portion of region A in the middle; Figure 4 This is a cross-sectional view of the present invention; Figure 5 This utility model Figure 4 A magnified view of a portion of region B in the middle; In the figure: 1. Conical graphite mold; 11. Annular shoulder; 12. Graphite filter screen; 2. Straight cylindrical copper crystallizer; 21. Spiral cooling water channel; 22. External thread; 23. Annular bottom groove; 231. Annular inner groove; 31. Stainless steel threaded pressure ring; 311. Strip-shaped protrusion; 312. Annular guide groove; 32. Sealing ring; 321. Annular outer clamping block. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0017] Please see Figures 1 to 4 This is the first embodiment of the present invention, which provides the following technical solution: an integrated tapered graphite mold suitable for copper crystallizers, comprising... A conical graphite mold 1 is a cylinder with a taper (the taper angle α is strictly controlled within 0.5°~2°). The outer diameter of the lower end of the conical graphite mold 1 is larger than the outer diameter of the upper end of the conical graphite mold 1, and the inner cavity of the conical graphite mold 1 is designed as a micro-tapered cylinder (taper angle β=0.1°~0.5°) to achieve self-lubricating guidance of the copper liquid flow channel. The conical graphite mold 1 is made of high-purity isostatic graphite material with a density ≥1.85g / cm³, thermal conductivity ≥100W / (m·K), and surface polishing roughness Ra≤0.8μm. A graphite filter screen 12 is also provided in the inner cavity of the conical graphite mold 1. The mesh structure of the graphite filter screen 12 can filter impurities in the copper liquid during subsequent use. The straight-cylinder copper crystallizer 2 has an inner cavity that is a smooth cylindrical tube of equal diameter. The top of the conical graphite mold 1 is inserted into the inner side of the straight-cylinder copper crystallizer 2, and the lower section of the conical graphite mold 1 is immersed in the copper liquid. In actual use, the top of the straight-cylinder copper crystallizer 2 is connected to a vacuum device, and the copper liquid below can be drawn up by negative pressure to achieve upward water-cooled copper casting. The straight-cylinder copper crystallizer 2 is made of chromium zirconium copper alloy (CuCrZr, thermal conductivity ≥330W / (m·K)) material, and the inner wall is plated with hard chrome (thickness 10~20μm). A high-temperature sealing component is installed between the conical graphite mold 1 and the straight-cylinder copper crystallizer 2 to achieve high-temperature sealing, prevent copper liquid leakage, and prevent vacuum leakage.

[0018] In this embodiment, preferably, the high-temperature sealing assembly includes an axial compression structure and a sealing ring 32. The sealing ring 32 is made of flexible graphite strip (expanded graphite content ≥99%, density 1.1~1.5g / cm³). The bottom inner wall of the straight cylindrical copper crystallizer 2 is provided with an annular bottom groove 23 for the installation of the sealing ring 32. The sealing ring 32 is embedded in the annular bottom groove 23, and the inner wall of the sealing ring 32 is pressed and contacted with the outer wall of the conical graphite mold 1 to form an annular seal, preventing copper liquid leakage and vacuum leakage.

[0019] In this embodiment, preferably, the axial pressing structure includes a stainless steel threaded pressure ring 31 (material 316L) rotatably sleeved on the outer wall of the conical graphite mold 1, and the top end of the stainless steel threaded pressure ring 31 is threadedly connected to the straight cylindrical copper crystallizer 2. Subsequently, the stainless steel threaded pressure ring 31 can be tightened clockwise to apply axial pressure (≥5MPa) to the conical graphite mold 1, which can push the conical graphite mold 1 upward, so that the sealing ring 32 is fully compressed and deformed, achieving a tight fit between the sealing ring 32 and the inner wall of the straight cylindrical copper crystallizer 2 and the outer wall of the conical graphite mold 1, thus completing the high-temperature sealing.

[0020] In this embodiment, preferably, the outer wall of the conical graphite mold 1 is provided with an integral annular shoulder 11, and the inner wall of the bottom end of the stainless steel threaded pressure ring 31 is provided with an annular guide groove 312 that is adapted to the annular shoulder 11. The annular shoulder 11 is located in the annular guide groove 312, so that the stainless steel threaded pressure ring 31 can be smoothly rotated and fitted onto the surface of the conical graphite mold 1.

[0021] In this embodiment, preferably, the top outer wall of the stainless steel threaded pressure ring 31 has a plurality of integral strip-shaped protrusions 311 evenly distributed, which can play an anti-slip role when the operator rotates and twists the stainless steel threaded pressure ring 31.

[0022] In this embodiment, preferably, the bottom outer wall of the straight cylindrical copper crystallizer 2 is provided with an external thread 22, and the thread on the inner wall of the stainless steel threaded pressure ring 31 is engaged with the external thread 22.

[0023] In this embodiment, preferably, a spiral cooling water channel 21 is also provided on the outer wall of the straight cylindrical copper crystallizer 2 above the external thread 22. Example 2

[0024] Please see Figures 1 to 5 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that the outer wall of the sealing ring 32 is provided with an integrated annular outer locking block 321, and the inner wall of the annular bottom groove 23 is provided with an annular inner locking groove 231 for the annular outer locking block 321 to be inserted. After the sealing ring 32 is pushed into the annular bottom groove 23, the annular outer locking block 321 will be inserted into the annular inner locking groove 231, ensuring the installation stability of the sealing ring 32 and preventing the sealing ring 32 from falling off unnecessarily during the assembly of the conical graphite mold 1 and the straight cylindrical copper crystallizer 2.

[0025] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated tapered graphite mold suitable for copper crystallizers, characterized in that: include A conical graphite mold (1) is a cylindrical body with a taper. The outer diameter of the lower end of the conical graphite mold (1) is larger than the outer diameter of the upper end of the conical graphite mold (1). The inner cavity of the conical graphite mold (1) is designed as a micro-tapered cylinder. A graphite filter screen (12) is also provided in the inner cavity of the conical graphite mold (1). A straight-cylinder copper crystallizer (2) has an inner cavity that is a smooth cylindrical tube of equal diameter, and the top of a conical graphite mold (1) is inserted into the inner side of the straight-cylinder copper crystallizer (2), with the lower section of the conical graphite mold (1) immersed in the copper liquid. A high-temperature sealing assembly is disposed between a conical graphite mold (1) and a straight-cylinder copper crystallizer (2).

2. The integrated tapered graphite mold suitable for copper crystallizers according to claim 1, characterized in that: The high-temperature sealing assembly includes an axial compression structure and a sealing ring (32). The bottom inner wall of the straight cylindrical copper crystallizer (2) is provided with an annular bottom groove (23) for the installation of the sealing ring (32). The sealing ring (32) is embedded in the annular bottom groove (23), and the inner wall of the sealing ring (32) is in contact with the outer wall of the conical graphite mold (1).

3. The integrated tapered graphite mold suitable for copper crystallizers according to claim 2, characterized in that: The axial clamping structure includes a stainless steel threaded clamping ring (31) that is rotatably sleeved on the outer wall of the conical graphite mold (1), and the top of the stainless steel threaded clamping ring (31) is threadedly connected to the straight cylindrical copper crystallizer (2).

4. The integrated tapered graphite mold suitable for copper crystallizers according to claim 3, characterized in that: The outer wall of the conical graphite mold (1) is provided with an integral annular shoulder (11), and the bottom inner wall of the stainless steel threaded pressure ring (31) is provided with an annular guide groove (312) that is adapted to the annular shoulder (11), and the annular shoulder (11) is located in the annular guide groove (312).

5. An integrated tapered graphite mold suitable for copper crystallizers according to claim 4, characterized in that: The stainless steel threaded pressure ring (31) has multiple integral strip-shaped protrusions (311) evenly distributed on the top outer wall.

6. An integrated tapered graphite mold suitable for copper crystallizers according to claim 5, characterized in that: The bottom outer wall of the straight cylindrical copper crystallizer (2) is provided with an external thread (22), and the thread on the inner wall of the stainless steel threaded pressure ring (31) is matched with the external thread (22).

7. An integrated tapered graphite mold suitable for copper crystallizers according to claim 6, characterized in that: The outer wall of the straight-cylinder copper crystallizer (2) is provided with a spiral cooling water channel (21) above the external thread (22), and the straight-cylinder copper crystallizer (2) is made of chromium zirconium copper alloy.

8. An integrated tapered graphite mold suitable for copper crystallizers according to claim 2, characterized in that: The outer wall of the sealing ring (32) is provided with an integral annular outer locking block (321), and the inner wall of the annular bottom groove (23) is provided with an annular inner locking groove (231) for the annular outer locking block (321) to be inserted.

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