High-purity oxygen-free copper rod forming device

Abstract

The application discloses a high-purity oxygen-free copper rod forming device and belongs to the technical field of metal continuous casting forming equipment. The device comprises a liquid supply cylinder, a steady flow tank, a steady pressure cylinder, an inlet protection pipe, an oxygen isolation pipe and a crystallizer which are sequentially communicated along the flow direction of copper liquid. The steady pressure cylinder is internally provided with an oxygen isolation disc which ascends and descends along with the liquid level of the copper liquid. The bottom side of the oxygen isolation disc is provided with a first skirt and a second skirt which can move downward. The inlet protection pipe is communicated with a negative pressure air supplement assembly. The oxygen isolation pipe is internally provided with a follow-up valve block. The follow-up valve block and the oxygen isolation pipe form a flow gap. When negative pressure disturbance is generated at the liquid inlet side of the crystallizer, the follow-up valve block moves towards the crystallizer to reduce the flow gap. The negative pressure air supplement assembly supplements protection gas and drives the second skirt to probe to the oxygen isolation position, so that the copper liquid flows around and then enters the second connecting pipe, thereby reducing air suction and gas entrainment in the continuous casting process and flow state mutation before liquid inlet.

Description

Technical Field

[0001] This application relates to the technical field of continuous casting equipment for copper rods, specifically to a high-purity oxygen-free copper rod forming device. Background Technology

[0002] High-purity oxygen-free copper rods are typically produced through processes including continuous liquid supply, pressure-stabilized liquid supply, crystallization, and traction output. During the forming process, molten copper enters the pressure-stabilized area through the liquid supply structure, and then enters the crystallizer through the inlet transition structure. The molten copper cools and crystallizes in the crystallizer to form a continuous copper rod, which is then continuously output under traction.

[0003] During the aforementioned forming process, the inlet side of the crystallizer is affected by the traction forming process. When the traction state fluctuates, instantaneous negative pressure disturbances are easily generated on the inlet side of the crystallizer. These negative pressure disturbances may be transmitted upstream along the inlet transition channel, causing changes in the flow pattern of the molten copper before it enters the crystallizer. When the flow cross-section near the inlet maintains a large opening, the molten copper is prone to local velocity abrupt changes or gas-liquid interface disturbances before entering the crystallizer, thereby increasing the risk of gas entrapment.

[0004] On the other hand, the copper liquid surface in the stabilizing region is usually adjacent to the protective gas space, and oxide films or gas disturbances are prone to exist near the liquid surface. When the negative pressure disturbance on the crystallizer side is transmitted to the vicinity of the liquid intake inlet, the liquid surface gas or surface oxide film in the stabilizing region may move towards the liquid intake inlet, causing the copper liquid entering the inlet protection zone to be entrained with gas or surface impurities. Existing devices usually rely on baffles of fixed height, protective gas coverage, or fixed flow channels for oxygen isolation, making it difficult to ensure that the oxygen isolation path, gas replenishment state, and crystallizer inlet flow cross section near the liquid intake inlet are triggered and occur separately by the same traction negative pressure disturbance when a traction negative pressure occurs.

[0005] Therefore, there is an urgent need in the existing technology for a high-purity oxygen-free copper rod forming device, so that when a traction negative pressure disturbance occurs on the liquid inlet side of the crystallizer, the corresponding relationship is formed by the gas replenishment in the inlet protection area, the extension of the oxygen isolation path of the liquid outlet in the pressure stabilizing cylinder, and the reduction of the flow gap in the oxygen isolation pipe, thereby reducing the problems of gas intake and entrapment near the liquid inlet of the second connecting pipe and the sudden change of flow state before liquid inlet of the crystallizer. Summary of the Invention

[0006] The main objective of this application is to provide a high-purity oxygen-free copper rod forming device.

[0007] To achieve the above objectives, the technical solution of this application is as follows: a high-purity oxygen-free copper rod forming device, comprising a liquid supply cylinder, a flow stabilizing tank, a pressure stabilizing cylinder, an inlet protection pipe, an oxygen barrier pipe, and a crystallizer connected sequentially along the copper liquid flow direction. The inlet protection pipe is connected to the bottom of the pressure stabilizing cylinder through a second connecting pipe. The crystallizer is used to receive the copper liquid output from the oxygen barrier pipe and crystallize the copper liquid to form a copper rod.

[0008] The device also includes an oxygen-barrier plate, a first skirt, a second skirt, a negative pressure gas supply assembly, and a follower valve block. The oxygen-barrier plate is disposed inside the pressure-stabilizing cylinder and can rise and fall vertically with the copper liquid level inside the cylinder. The first skirt is disposed on the bottom side of the oxygen-barrier plate, and the second skirt is disposed relative to the oxygen-barrier plate and located inside the first skirt. The negative pressure gas supply assembly is connected to the inlet protection pipe and is used to supply protective gas to the inlet protection pipe and drive the second skirt to move downward relative to the oxygen-barrier plate. The follower valve block is movably disposed inside the oxygen-barrier pipe, forming a flow gap between the follower valve block and the oxygen-barrier pipe for the copper liquid to enter the crystallizer. When negative pressure disturbance occurs at the inlet side of the crystallizer due to traction molding, the disturbance is transmitted to the flow gap, causing the follower valve block to move towards the crystallizer to reduce the flow gap. The negative pressure gas supply component injects protective gas into the inlet protection pipe and drives the second skirt to descend relative to the oxygen barrier plate to the oxygen barrier position. At the oxygen barrier position, the bottom end of the second skirt is lower than the bottom end of the first skirt, and the second skirt is located above or circumferentially outside the inlet of the second connecting pipe, so that the copper liquid flows around the outside of the second skirt and enters the second connecting pipe. This allows the injection of protective gas into the inlet protection pipe, the extension of the oxygen barrier path near the inlet of the second connecting pipe, and the reduction of the flow cross-section within the oxygen barrier pipe to occur under the same negative pressure disturbance conditions.

[0009] Furthermore, the negative pressure gas replenishment assembly includes a gas supply pipe, a valve body, a negative pressure pipe, and a pneumatic actuator. The gas supply pipe is fixed to the top side of the pressure stabilizing cylinder and connects to the inside of the pressure stabilizing cylinder. The gas supply pipe is connected to the inlet end of the valve body through the main pressure replenishment pipe. The negative pressure pipe connects to the inlet protection pipe and the valve body. The valve body has a docking hole as the outlet end, which connects to a second branch pipe. One path of the second branch pipe connects to the inlet protection pipe through the first branch pipe to form a gas replenishment branch, which is used to guide the protective gas in the valve body into the inlet protection pipe. The other path of the second branch pipe connects to the pneumatic actuator for cooperation with the second skirt drive to form a downward drive branch, which is used to guide the protective gas in the valve body to the pneumatic actuator. A switching element is provided inside the valve body. The switching element is used to block the connection between the inlet end and the outlet end of the valve body when no negative pressure disturbance is generated on the liquid inlet side of the crystallizer, and to connect the inlet end and the outlet end of the valve body when a negative pressure disturbance is generated on the liquid inlet side of the crystallizer. With this setup, the protective gas can be diverted into the inlet protection pipe and pneumatic actuators when negative pressure disturbances occur.

[0010] Furthermore, the switching component includes a second piston, a first connecting rod, and a valve ball. The second piston is slidably sealed within the valve housing, the first connecting rod is connected to the second piston, and the valve ball is located at the end of the first connecting rod away from the second piston. The valve housing has a valve orifice located at its inlet end, the valve ball being used to block or open the valve orifice, and a mating hole is also provided on the valve housing. A first air guide hole is provided on the top side of the second piston, and a second air guide hole communicating with the first air guide hole is provided on the side of the second piston. The second air guide hole is misaligned with the mating hole when no negative pressure disturbance occurs, and moves to a position communicating with the mating hole when the valve ball opens the valve orifice. A fifth spring is provided between the second piston and the valve housing, the fifth spring being used to push the second piston back to its original position after the negative pressure in the inlet protection tube weakens. In this way, the movement of the second piston can simultaneously form two states: valve orifice open and air guide hole aligned, and can be reset after the negative pressure weakens.

[0011] Furthermore, the pneumatic actuator includes a piston cylinder positioned above the oxygen-barrier plate. The top side of the piston cylinder is connected to a downward drive branch. A first piston is slidably sealed within the piston cylinder, and a transmission rod, connected to the second skirt drive, is fixedly connected to the bottom side of the first piston. Protective gas entering the piston cylinder via the downward drive branch acts on the first piston, causing it to drive the second skirt downward via the transmission rod. Based on this structure, the replenished protective gas can be converted into the downward movement of the transmission rod.

[0012] Furthermore, a first sealing groove and a second sealing groove, which communicate with each other, are respectively formed on the bottom and top sides of the oxygen barrier plate. A first base plate is slidably sealed in the first sealing groove, and the top of the second skirt is fixed to the bottom side of the first base plate. A second base plate, fixed to the top side of the first base plate, is slidably sealed in the second sealing groove, and the top side of the second base plate is in a driving engagement with the bottom end of the transmission rod. A first limiting block is provided on the outer wall of the second base plate, and a first limiting groove is axially formed on the side wall of the second sealing groove, which slides in engagement with the first limiting block. Through the engagement of the first limiting block and the first limiting groove, the downward travel of the second skirt relative to the oxygen barrier plate can be limited.

[0013] Furthermore, a second limiting block is provided at the bottom of the transmission rod, and a second limiting groove is opened on the top side of the second base plate, with the second limiting block located within the second limiting groove. A first spring is sleeved on the outside of the transmission rod, with its two ends fixed to the top side of the second limiting block and the top side of the second limiting groove, respectively. When the transmission rod is driven downward by the first piston, the second limiting block first moves downward along the second limiting groove, stretching the first spring. After the second limiting block abuts against the bottom of the second limiting groove, the transmission rod drives the second base plate, the first base plate, and the second skirt to move downward together. The forming device also includes a locking mechanism. When the second limiting block moves towards the bottom of the second limiting groove, the locking mechanism is used to lock the lifting position of the oxygen barrier plate relative to the pressure stabilizing cylinder, thereby limiting the oxygen barrier plate from continuing to rise and fall with the copper liquid level. Thus, the position locking action of the oxygen barrier plate can occur before the downward movement of the second skirt.

[0014] Furthermore, a lower limit ring and an upper limit ring are respectively provided on the inner wall of the pressure stabilizing cylinder. The lower limit ring is located below the upper limit ring, and the oxygen barrier plate is located between the lower limit ring and the upper limit ring. Through the lower limit ring and the upper limit ring, the range of the oxygen barrier plate rising and falling with the copper liquid level can be limited within a predetermined height range inside the pressure stabilizing cylinder.

[0015] Furthermore, the locking mechanism includes a bracket fixed to the top side of the oxygen barrier plate, a hanging rod fixed to the bottom side of the bracket, a clearance groove parallel to the transmission rod on the hanging rod, a support slider slidably disposed in the clearance groove, and a third spring disposed between the bottom side of the support slider and the bottom of the clearance groove. A rotating shaft is horizontally inserted and fixed to the support slider, and an inclined swing rod is rotatably sleeved on the outside of the rotating shaft. One end of the swing rod is hinged to the outer wall of the transmission rod, and the other end of the swing rod is fixed to a fixed block perpendicular to it. A third limiting groove is formed on the side of the fixed block away from the swing rod, and a positioning rod parallel to the swing rod is slidably disposed in the third limiting groove. A fourth spring is disposed between the top side of the positioning rod and the top side of the third limiting groove. A guide cylinder is fixed to the top side of the oxygen barrier plate, and a guide rod is slidably inserted into the top of the guide cylinder. The top side of the guide rod is fixed to the bottom side of the upper limit ring, and multiple positioning holes are axially formed on the outer wall of the guide rod to engage with the positioning rod. Based on this engagement relationship, when the transmission rod moves downward, the positioning rod can be driven into the corresponding positioning hole by the swing rod.

[0016] Furthermore, the guide cylinder has a movable opening for the positioning rod to pass through. When the transmission rod moves downward, it drives the swing arm to deflect, causing the positioning rod to engage with the positioning hole through the movable opening, thus locking the relative position of the guide cylinder and the guide rod. A limit plate is also provided on the oxygen barrier plate to restrict the swing arm from deflecting to a horizontal position. The positioning rod can maintain its engagement with the positioning hole after the swing arm is limited. When the transmission rod returns to its original position and moves upward, it drives the swing arm to deflect in the opposite direction, causing the positioning rod to exit the positioning hole, thus releasing the engagement lock between the guide cylinder and the guide rod.

[0017] Furthermore, a telescopic tube is connected to the top of the piston cylinder. One end of the telescopic tube is connected to the piston cylinder, and the other end is fixed to the inner top wall of the pressure stabilizing cylinder and connected to the downward drive branch. The telescopic tube can extend and retract with the rise and fall of the oxygen-barrier plate relative to the pressure stabilizing cylinder, allowing the oxygen-barrier plate to rise and fall with the copper liquid level in the pressure stabilizing cylinder when no negative pressure disturbance is generated on the crystallizer inlet side. Through the telescopic tube, the piston cylinder is kept in communication with the downward drive branch, while the floating of the oxygen-barrier plate is not restricted.

[0018] Furthermore, a first flow channel and a second flow channel are sequentially formed within the oxygen-barrier pipe along the copper liquid flow direction. The first flow channel connects to the inlet protection pipe, and the second flow channel connects to the crystallizer via a third connecting pipe. A second slope is formed at the junction of the first and second flow channels. A follower valve block is disposed within the first flow channel and has a first slope opposite to the second slope. A flow gap is formed between the first and second slopes, connecting the first and second flow channels. Through the cooperation of the first and second slopes, the axial movement of the follower valve block can be converted into a change in the opening degree of the flow gap.

[0019] Furthermore, a guide cone is provided on the side of the follower valve block facing away from the first slope, and a slot is also provided inside the oxygen barrier pipe. A second connecting rod is slidably sealed in the slot. One end of the second connecting rod is connected to the follower valve block, and a sixth spring is provided between the other end of the second connecting rod and the slot wall. When negative pressure disturbance is generated at the liquid inlet side of the crystallizer due to traction molding, the negative pressure disturbance acts on the first slope and the flow gap through the third connecting pipe and the second flow channel, causing the follower valve block to move towards the third connecting pipe and compress the sixth spring. The first slope moves closer to the second slope, thereby reducing the flow gap. Thus, the flow gap can be reset by the sixth spring after the negative pressure disturbance weakens.

[0020] The beneficial effects of this application are reflected in:

[0021] First, this application incorporates an oxygen-barrier plate within the pressure-stabilizing cylinder, capable of rising and falling with the copper liquid level. A first skirt is positioned at the bottom of the oxygen-barrier plate, and a second skirt, capable of moving downwards relative to the oxygen-barrier plate, is positioned inside the first skirt. Simultaneously, a follow-up valve block, capable of altering the flow gap, is installed within the oxygen-barrier pipe. When a negative pressure disturbance occurs at the crystallizer inlet, the second skirt descends to the oxygen-barrier position, and the follow-up valve block reduces the flow gap before the copper liquid enters the crystallizer. At the oxygen-barrier position, the bottom of the second skirt is lower than the bottom of the first skirt, and the second skirt is located above or circumferentially outside the inlet of the second connecting pipe, allowing the copper liquid to flow around the outside of the second skirt before entering the second connecting pipe. This extends the gas intrusion path near the inlet of the second connecting pipe, and reduces the cross-sectional area of ​​the copper liquid before entering the crystallizer under the same traction negative pressure disturbance, thereby reducing the problems of gas intake and entrapment near the inlet of the second connecting pipe and sudden changes in flow pattern before the crystallizer enters.

[0022] Secondly, this application connects the inlet protection pipe to the valve body via a negative pressure pipe, and installs a switching component within the valve body that can move under negative pressure. This allows the valve body to block the gas supply path when no negative pressure disturbance occurs, and to connect the gas supply path when a negative pressure disturbance occurs. Thus, the replenishment of protective gas corresponds to the pressure state within the inlet protection pipe, reducing airflow disturbances caused by the continuous entry of protective gas into the inlet protection pipe under undisturbed conditions.

[0023] Third, this application utilizes the cooperation of the transmission rod, the second limiting block, the second limiting groove, the locking mechanism, the second base plate, and the first base plate to ensure that the transmission rod first triggers the position locking of the oxygen barrier plate during its downward movement, and then drives the second skirt to descend relative to the oxygen barrier plate. This allows the oxygen barrier plate to first maintain its relative lifting position to the pressure stabilizing cylinder, and then allows the second skirt to enter the oxygen barrier position, reducing the weakening of the oxygen barrier effect due to the overall movement of the oxygen barrier plate.

[0024] Fourth, this application, by setting a first slope, a second slope, a second connecting rod, and a sixth spring inside the oxygen-barrier pipe, enables the follower valve block to move towards the third connecting pipe and reduce the flow gap under negative pressure disturbance on the crystallizer side. After the negative pressure disturbance weakens, it is pushed back to its original position by the sixth spring. Thus, the flow cross-section before the copper liquid enters the crystallizer can change with the pressure state on the crystallizer side. Attached Figure Description

[0025] In the attached diagram:

[0026] Figure 1 This is a three-dimensional structural diagram of the entire application;

[0027] Figure 2 for Figure 1 Cross-sectional structural diagram of the medium-stability flow box;

[0028] Figure 3 for Figure 1 A cross-sectional view of the medium-pressure stabilizer cylinder shows that the liquid inlet side of the crystallizer is not affected by negative pressure disturbance due to traction molding.

[0029] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0030] Figure 5 for Figure 3 Enlarged structural diagram at point B;

[0031] Figure 6 for Figure 1 A cross-sectional view of the valve housing, where the valve orifice is blocked by the valve ball;

[0032] Figure 7 for Figure 3 A schematic diagram of the locking mechanism's rocker arm and other components in their initial state;

[0033] Figure 8 for Figure 1 Schematic diagram of the cross-sectional structure of the inlet protection pipe;

[0034] Figure 9 for Figure 1 A cross-sectional view of the oxygen septum tube shows that the follower valve block has not moved toward the third connecting tube.

[0035] Figure 10 for Figure 3 A structural schematic diagram of the central oxygen diaphragm, the first skirt, the second skirt, etc.;

[0036] Figure 11 for Figure 10 Schematic diagram of the structure of the central oxygen diaphragm and the first skirt;

[0037] Figure 12 for Figure 10 A structural schematic diagram of the first base plate, the second skirt, the second base plate, etc.

[0038] Figure 13 for Figure 3 A cross-sectional view of the medium-pressure stabilizer cylinder in another state. At this time, the liquid inlet side of the crystallizer is disturbed by negative pressure due to traction molding, and the second limiting block moves to the bottom of the second limiting groove.

[0039] Figure 14 for Figure 13 Enlarged structural diagram at point C;

[0040] Figure 15 for Figure 13 Enlarged structural diagram at point D;

[0041] Figure 16 for Figure 6 A cross-sectional view of the valve body in another state, where the valve ball is disengaged from the valve hole, the valve hole is open, and the second air guide hole is connected to the docking hole.

[0042] Figure 17 for Figure 9 A cross-sectional view of the oxygen diaphragm tube in another state, where the follower valve block moves toward the third connecting pipe, causing the flow gap to decrease.

[0043] Figure 18 for Figure 3 A cross-sectional structural diagram of the medium-pressure stabilizing cylinder in another state. At this time, the liquid inlet side of the crystallizer is affected by negative pressure disturbance due to traction molding, and the transmission rod drives each base plate and the second skirt to move downward.

[0044] Figure 19 for Figure 18 Enlarged structural diagram at point E;

[0045] Figure 20 for Figure 18 Enlarged structural diagram at point F.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Liquid supply cylinder; 2. Flow stabilizing box; 201. First connecting pipe; 3. Pressure stabilizing cylinder; 4. Inlet protection pipe; 5. Oxygen barrier pipe; 501. First flow channel; 502. Second slope; 503. Second flow channel; 504. Slot; 6. Crystallizer; 7. Gas supply pipe; 8. Valve shell; 801. Valve hole; 802. Connecting hole; 9. Negative pressure pipe; 10. Main pressure replenishment pipe; 11. First branch pipe; 12. Second branch pipe; 13. Second connecting pipe; 14. Bracket; 16. Oxygen barrier plate; 17. Lower limit ring; 18. Upper limit ring; 19. First skirt; 20. First base plate; 21. Second skirt; 22. Support; 23. First sealing groove; 24. Second base plate; 25. Second sealing groove; 26. First limiting block; 27. First limiting groove; 28. Transmission rod; 29. 30. Second limiting block; 31. First spring; 32. Telescopic tube; 33. Piston cylinder; 34. First piston; 35. Second spring; 36. Swing rod; 37. Limiting plate; 38. Hanging rod; 39. Support slider; 40. Avoidance groove; 41. Rotating shaft; 42. Fixed block; 43. Third spring; 44. Positioning rod; 45. Third limiting groove; 46. Fourth spring; 47. Guide cylinder; 48. Guide rod; 49. Positioning hole; 50. Movable port; 51. Valve ball; 52. First connecting rod; 53. Second piston; 54. First air guide hole; 55. Second air guide hole; 56. Fifth spring; 57. Follower valve block; 58. First slope; 59. Flow guide cone; 60. Second connecting rod; 61. Sixth spring; 62. Third connecting tube; 63. Flow gap. Detailed Implementation

[0048] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. Unless otherwise specified, the embodiments and features described in the present application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of this application.

[0049] like Figures 1 to 20As shown, this application provides a high-purity oxygen-free copper rod forming device, including a supply cylinder 1, a flow stabilizing tank 2, a pressure stabilizing tank 3, an inlet protection pipe 4, an oxygen barrier pipe 5, and a crystallizer 6, which are connected sequentially along the copper liquid flow direction. The supply cylinder 1 is used to supply copper liquid to the flow stabilizing tank 2. The bottom side of the flow stabilizing tank 2 is connected to the inlet port of the pressure stabilizing tank 3 near the bottom side wall through a first connecting pipe 201, so that the copper liquid enters the pressure stabilizing tank 3. The bottom of the pressure stabilizing tank 3 is connected to the inlet protection pipe 4 through a second connecting pipe 13. The side of the inlet protection pipe 4 away from the second connecting pipe 13 is connected to the oxygen barrier pipe 5. The oxygen barrier pipe 5 is connected to the crystallizer 6 through a third connecting pipe 62. The crystallizer 6 is used to receive the copper liquid output from the oxygen barrier pipe 5 and crystallize the copper liquid therein to form a copper rod. A protective gas space is formed in the inlet protection pipe 4 above the main flow of copper liquid, and the connecting port of the first branch pipe 11 is connected to the protective gas space.

[0050] The gas supply pipe 7 is fixed to the top side of the pressure stabilizing cylinder 3 and communicates with the interior of the pressure stabilizing cylinder 3. The gas supply pipe 7 is used to supply protective gas into the pressure stabilizing cylinder 3. The protective gas can be argon, nitrogen, or other gases used to reduce the oxidation of copper liquid. A bracket 14 is fixed to the outer wall of the pressure stabilizing cylinder 3, and the valve housing 8 is mounted on the bracket 14. The gas supply pipe 7 is also connected to the gas inlet end of the valve housing 8 through the pressure replenishment main pipe 10, and the inlet protective pipe 4 is connected to the valve housing 8 through the negative pressure pipe 9.

[0051] A second piston 53 is slidably sealed inside the valve housing 8, and the second piston 53 can move axially along the valve housing 8. A fifth spring 56 is provided between the bottom side of the second piston 53 and the bottom side of the valve housing 8. One end of the fifth spring 56 abuts against or is connected to the bottom side of the second piston 53, and the other end abuts against or is connected to the bottom side of the valve housing 8, and is used to provide a restoring force after the second piston 53 moves down under negative pressure. The second piston 53 is connected to a valve ball 51 through a first connecting rod 52. A valve hole 801 is provided at the air inlet end of the valve housing 8, and the valve ball 51 is used to block or open the valve hole 801.

[0052] The second piston 53 has a first air guide hole 54 on its top side and a second air guide hole 55 on its side, which communicates with the first air guide hole 54. A docking hole 802 is provided on the side wall of the valve housing 8. When there is no negative pressure disturbance, the valve ball 51 blocks the valve hole 801, and the second air guide hole 55 is misaligned with the docking hole 802, preventing the protective gas in the supply pipe 7 from entering the docking hole 802 through the valve housing 8. When a negative pressure disturbance occurs, the negative pressure in the inlet protective pipe 4 is transmitted to the valve housing 8 through the negative pressure pipe 9. The second piston 53 moves downward along the valve housing 8 axis, the fifth spring 56 is compressed, the valve ball 51 moves downward with the first connecting rod 52 and leaves the valve hole 801, and simultaneously the second air guide hole 55 moves to a position communicating with the docking hole 802. At this time, the protective gas can be output through the supply pipe 7, the pressure replenishment main pipe 10, the valve hole 801, the valve housing 8, the first air guide hole 54, the second air guide hole 55, and the docking hole 802.

[0053] In one specific structure, the docking hole 802 is connected to the second branch pipe 12, which forms a diversion pipe. One path of the second branch pipe 12 connects to the inlet protection pipe 4 via the first branch pipe 11, forming a gas replenishment branch. The connection port between the first branch pipe 11 and the inlet protection pipe 4 is located above or slightly above the copper liquid flow channel inside the inlet protection pipe 4, allowing the replenished protective gas to enter the protective gas space inside the inlet protection pipe 4, rather than being directly sprayed towards the main copper liquid flow. The other path of the second branch pipe 12 connects to the piston cylinder 33 via the telescopic pipe 32, forming a downward driving branch. In this way, part of the protective gas output from the valve housing 8 can enter the inlet protection pipe 4 via the first branch pipe 11, and the other part can enter the piston cylinder 33 via the telescopic pipe 32.

[0054] An oxygen-barrier plate 16 is provided inside the pressure stabilizing cylinder 3. The oxygen-barrier plate 16 is located inside the pressure stabilizing cylinder 3 and can rise and fall vertically with the copper liquid level inside the pressure stabilizing cylinder 3. Specifically, the oxygen-barrier plate 16 includes a closed buoyancy cavity, or the oxygen-barrier plate 16 is made of a refractory material that is resistant to high temperature and has a density lower than that of copper liquid, so that the oxygen-barrier plate 16 can obtain buoyancy support at the copper liquid level. A lifting gap is left between the outer periphery of the oxygen-barrier plate 16 and the inner wall of the pressure stabilizing cylinder 3, and its swing is limited by the cooperation of the guide cylinder 47 and the guide rod 48.

[0055] The inner wall of the pressure stabilizing cylinder 3 is provided with a lower limit ring 17 and an upper limit ring 18, respectively. The lower limit ring 17 is located below the upper limit ring 18, and the oxygen barrier 16 is located between the lower limit ring 17 and the upper limit ring 18. The oxygen barrier 16 can rise and fall between the lower limit ring 17 and the upper limit ring 18 as the copper liquid level in the pressure stabilizing cylinder 3.

[0056] The oxygen barrier plate 16 has a first skirt 19 on its bottom side. A first sealing groove 23 and a second sealing groove 25, which communicate with each other, are respectively formed on the bottom and top sides of the oxygen barrier plate 16. A first base plate 20 is slidably sealed in the first sealing groove 23, and a second skirt 21 is fixed to the bottom side of the first base plate 20. The second skirt 21 is located inside the first skirt 19. When no negative pressure disturbance occurs, the second skirt 21 maintains its initial position; after the second skirt 21 descends to the oxygen barrier position, its bottom end is lower than the bottom end of the first skirt 19. A second base plate 24 is slidably sealed in the second sealing groove 25, and the second base plate 24 is fixed to the top side of the first base plate 20. A first limiting block 26 is provided on the outer wall of the second base plate 24, and a first limiting groove 27 is axially formed on the side wall of the second sealing groove 25. The first limiting block 26 is located within the first limiting groove 27 and can move up and down along the first limiting groove 27. The first limiting groove 27 is used to limit the downward travel of the second base plate 24, the first base plate 20, and the second skirt 21 relative to the oxygen barrier plate 16.

[0057] A first refractory sliding seal structure is provided on the wall of the first sealing groove 23. The first refractory sliding seal structure includes at least one of a graphite sealing bushing, a boron nitride coated graphite bushing, a silicon carbide ceramic bushing, or an alumina ceramic bushing embedded in the wall of the first sealing groove 23. A first sliding seal outer wall is formed on the outer periphery of the first base plate 20 to cooperate with the first refractory sliding seal structure, and an axial sliding seal is formed between the first sliding seal outer wall and the first refractory sliding seal structure. An annular sealing step or a labyrinthine groove may be provided on the first sliding seal outer wall to restrict the copper liquid or gas near the liquid surface from entering the interior of the oxygen barrier 16 along the first sealing groove 23 when the first base plate 20 moves up and down relative to the oxygen barrier 16. This allows the first base plate 20 to maintain its downward movement capability near the surface of the high-temperature copper liquid and reduces its movement gap from becoming a gas intrusion channel.

[0058] A second refractory sliding seal structure is provided on the groove wall of the second sealing groove 25. The second refractory sliding seal structure includes at least one of a heat-resistant metal guide sleeve, a graphite sealing bushing, a boron nitride coated graphite bushing, or a refractory ceramic bushing. The outer periphery of the second base plate 24 forms a second sliding seal outer wall that mates with the second refractory sliding seal structure, and an axial sliding seal fit is formed between the second sliding seal outer wall and the second refractory sliding seal structure. The second refractory sliding seal structure is used to guide and seal the second sealing groove 25 when the second base plate 24 moves downward relative to the oxygen barrier plate 16 driven by the transmission rod 28, restricting the leakage of protective gas or high-temperature gas along the second sealing groove 25, and enabling the downward movement of the second base plate 24 to be transmitted to the first base plate 20 and the second skirt 21.

[0059] In this application, at least the surfaces of the oxygen barrier plate 16, the first skirt 19, the second skirt 21, the first base plate 20, the second base plate 24, the inner wall of the oxygen barrier tube 5, and the follower valve block 57 that are in direct contact with the copper liquid are made of graphite, boron nitride coated graphite, silicon carbide ceramic, alumina ceramic, or heat-resistant alloy material resistant to copper liquid corrosion.

[0060] A bracket 22 is fixed to the top side of the oxygen-barrier plate 16, and a piston cylinder 33 is fixedly inserted into the bracket 22. The top end of the piston cylinder 33 is connected to a telescopic tube 32. The upper end of the telescopic tube 32 is connected to the second branch pipe 12 and fixed relative to the inner top wall of the pressure stabilizing cylinder 3. The lower end of the telescopic tube 32 is connected to the top end of the piston cylinder 33. The telescopic tube 32 can extend or shorten as the oxygen-barrier plate 16 rises and falls relative to the pressure stabilizing cylinder 3, so that the piston cylinder 33 can still maintain communication with the second branch pipe 12 when the oxygen-barrier plate 16 rises and falls. When there is no negative pressure disturbance, the extension and retraction of the telescopic tube 32 allows the oxygen-barrier plate 16 to rise and fall freely with the copper liquid level in the pressure stabilizing cylinder 3.

[0061] A first piston 34 is slidably sealed inside the piston cylinder 33. The cavity of the piston cylinder 33 below the first piston 34 is provided with an exhaust port. The exhaust port is connected to the protective gas space inside the pressure stabilizing cylinder 3 or the external low-pressure return gas channel, so as to discharge the gas in the cavity below the first piston 34 when the first piston 34 moves down.

[0062] A transmission rod 28 is fixed to the bottom side of the first piston 34. The transmission rod 28 extends downward from the piston cylinder 33 and engages with the second base plate 24. A second spring 35 is sleeved on the outside of the transmission rod 28. One end of the second spring 35 abuts against or is connected to the bottom side of the first piston 34, and the other end abuts against or is connected to the bottom side of the groove in the piston cylinder 33. After the protective gas enters the piston cylinder 33, it acts on the first piston 34 and causes the first piston 34 to move downward along the axial direction of the piston cylinder 33. The second spring 35 is compressed, and the transmission rod 28 moves downward with the first piston 34.

[0063] A second limiting block 29 is provided at the bottom end of the transmission rod 28, and a second limiting groove 30 is formed on the top side of the second base plate 24, with the second limiting block 29 located within the second limiting groove 30. A first spring 31 is sleeved on the outside of the transmission rod 28, with one end of the first spring 31 fixed to the top side of the second limiting block 29 and the other end fixed to the top side of the second limiting groove 30. In the initial stage of the downward movement of the transmission rod 28, the second limiting block 29 first moves along the second limiting groove 30 towards the bottom of the groove, stretching the first spring 31. Before the second limiting block 29 abuts the bottom of the second limiting groove 30, the transmission rod 28 moves downward relative to the second base plate 24.

[0064] The molding device also includes a locking mechanism. A hanging rod 38 is fixed to the bottom of the support 22. A clearance groove 40 parallel to the transmission rod 28 is formed on the hanging rod 38. A support slider 39 is slidably disposed in the clearance groove 40. A third spring 43 is disposed between the bottom of the support slider 39 and the bottom of the clearance groove 40. One end of the third spring 43 abuts against or is connected to the bottom of the support slider 39, and the other end abuts against or is connected to the bottom of the clearance groove 40. A rotating shaft 41 is horizontally inserted and fixed to the support slider 39. The shaft of the swing rod 36 is rotatably sleeved on the outside of the rotating shaft 41. One end of the swing rod 36 is hinged to the outer wall of the transmission rod 28, and the other end is fixed to a block 42 perpendicular to the swing rod 36.

[0065] A third limiting groove 45 is provided on the side of the fixed block 42 away from the swing rod 36, and a positioning rod 44 parallel to the swing rod 36 is slidably disposed in the third limiting groove 45. A fourth spring 46 is disposed between the top side of the positioning rod 44 and the top side of the third limiting groove 45. One end of the fourth spring 46 abuts or is connected to the top side of the positioning rod 44, and the other end abuts or is connected to the top side of the third limiting groove 45. A guide cylinder 47 is fixed to the top side of the oxygen isolation plate 16, and a guide rod 48 is slidably inserted into the top of the guide cylinder 47. The top side of the guide rod 48 is fixed to the bottom side of the upper limit ring 18, and multiple positioning holes 49 are axially opened on the outer wall of the guide rod 48. A movable opening 50 is opened on the guide cylinder 47 for the positioning rod 44 to pass through.

[0066] In the initial stage of the downward movement of the transmission rod 28, the transmission rod 28 drives one end of the swing rod 36 to move downward. Since the body of the swing rod 36 is rotatably sleeved on the outside of the rotating shaft 41, the swing rod 36 deflects around the rotating shaft 41, and drives the fixed block 42 and the positioning rod 44 to move toward the movable opening 50 of the guide cylinder 47. When the swing rod 36 deflects to a horizontal state, the limiting plate 37 restricts the swing rod 36 from continuing to deflect, and the positioning rod 44 is engaged in the corresponding positioning hole 49 of the guide rod 48 through the movable opening 50, so that the relative position of the guide cylinder 47 and the guide rod 48 is locked. Since the guide cylinder 47 is fixed to the oxygen isolation plate 16 and the guide rod 48 is fixed to the upper limit ring 18, after the guide cylinder 47 and the guide rod 48 are locked, the lifting position of the oxygen isolation plate 16 relative to the pressure stabilizing cylinder 3 is locked.

[0067] After the positioning rod 44 engages with the positioning hole 49, the transmission rod 28 continues to move downwards. When the second limiting block 29 abuts against the bottom of the second limiting groove 30, the transmission rod 28 drives the second base plate 24, the first base plate 20, and the second skirt 21 to move downwards together. At this time, the first limiting block 26 moves along the first limiting groove 27 from the top side to the bottom side, and the second skirt 21 descends relative to the oxygen barrier plate 16 to the oxygen barrier position.

[0068] During the downward movement of the second skirt 21, to avoid interference between the swing arm 36, the fixed block 42, and the positioning rod 44 and the downward movement of the second skirt 21, the swing arm 36 drives the support slider 39 to move downward in the clearance groove 40 via the pivot 41, compressing the third spring 43. Simultaneously, the fixed block 42 moves downward relative to the positioning rod 44 via the third limiting groove 45, compressing the fourth spring 46. The positioning rod 44 remains engaged in the positioning hole 49, thus allowing the second skirt 21 to continue downward while the oxygen barrier plate 16 is locked. The extension direction of the clearance groove 40 is consistent with the downward movement direction of the transmission rod 28, and the extension direction of the third limiting groove 45 is consistent with the axial direction of the positioning rod 44. This allows the swing arm 36 to release the continued downward movement of the transmission rod 28 through the downward movement of the support slider 39 and the sliding of the fixed block 42 relative to the positioning rod 44, even while the positioning rod 44 remains engaged.

[0069] After the second skirt 21 descends, it enters the oxygen-barrier position. In this position, the bottom of the second skirt 21 is lower than the bottom of the first skirt 19, and the second skirt 21 is located above or circumferentially outside the inlet of the second connecting pipe 13, requiring the molten copper to flow around the outside of the second skirt 21 before entering the second connecting pipe 13. The first skirt 19 and the second skirt 21 together form a flow path, allowing the second connecting pipe 13 to draw liquid from the lower layer of molten copper in the pressure stabilizing cylinder 3 and extending the path for gas near the liquid surface to enter the vicinity of the inlet of the second connecting pipe 13.

[0070] A first flow channel 501 and a second flow channel 503 are sequentially formed within the oxygen-barrier pipe 5 along the copper liquid flow direction. The first flow channel 501 is connected to the inlet protection pipe 4, and the second flow channel 503 is connected to the crystallizer 6 via a third connecting pipe 62. A second slope 502 is formed at the junction of the first flow channel 501 and the second flow channel 503. A follower valve block 57 is axially movable in the first flow channel 501. The follower valve block 57 has a first slope 58 opposite to the second slope 502, and a flow gap 63 is formed between the first slope 58 and the second slope 502. After entering the first flow channel 501 through the inlet protection pipe 4, the copper liquid enters the second flow channel 503 through the flow gap 63, and then enters the crystallizer 6 via the third connecting pipe 62.

[0071] A guide cone 59 is provided on the side of the follower valve block 57 facing away from the first slope 58. The guide cone 59 is used to guide the copper liquid to flow towards the flow gap 63. A slot 504 is also provided inside the oxygen barrier tube 5. A second connecting rod 60 is slidably sealed in the slot 504. One end of the second connecting rod 60 is connected to the follower valve block 57, and a sixth spring 61 is provided between the other end of the second connecting rod 60 and the groove wall of the slot 504. One end of the sixth spring 61 abuts against or is connected to the second connecting rod 60, and the other end abuts against or is connected to the groove wall of the slot 504.

[0072] To ensure the second connecting rod 60 remains movable near the high-temperature molten copper environment, a refractory guide seal (not shown) is provided at one end of the slot 504 near the first flow channel 501. The refractory guide seal is embedded with at least one of a graphite guide sleeve, a boron nitride coated graphite sleeve, a silicon carbide ceramic sleeve, or an alumina ceramic sleeve. The second connecting rod 60 passes through the refractory guide seal and forms an axial sliding seal with it. The outer periphery of the second connecting rod 60 may be provided with a heat-resistant alloy outer wall or a refractory ceramic coating. The end of the refractory guide seal near the first flow channel 501 forms a constricted sealing section or a labyrinth sealing groove to allow axial movement of the second connecting rod 60 while restricting the outward intrusion of molten copper, oxide inclusions, or high-temperature gas along the slot 504. Thus, even when the follower valve block 57 moves under negative pressure disturbance, the second connecting rod 60 can still be stably guided along the slot 504.

[0073] When negative pressure disturbance occurs at the inlet side of the crystallizer 6 due to traction molding, this disturbance is transmitted to the flow gap 63 via the third connecting pipe 62 and the second flow channel 503. Since the first slope 58 of the follower valve block 57 faces the second flow channel 503, the negative pressure on the crystallizer 6 side acts on the area near the first slope 58 and the flow gap 63 via the second flow channel 503, causing the follower valve block 57 to experience an axial force towards the third connecting pipe 62. When this axial force exceeds the preload of the sixth spring 61, the follower valve block 57 compresses the sixth spring 61 and moves towards the third connecting pipe 62. As the follower valve block 57 moves, the first slope 58 approaches the second slope 502, reducing the flow gap 63, while the second connecting rod 60 compresses the sixth spring 61. After the flow gap 63 decreases, the flow cross-section before the copper liquid enters the crystallizer 6 also decreases. After the negative pressure disturbance is reduced, the sixth spring 61 pushes the second connecting rod 60 and the follower valve block 57 to reset, so that the flow gap 63 is restored to the opening degree in the undisturbed state.

[0074] In addition, the oxygen isolation tube 5 is provided with a limiting step to limit the maximum travel of the follower valve block 57 toward the third connecting pipe 62. When the follower valve block 57 abuts against the limiting step, the minimum flow gap 63 is still maintained between the first slope 58 and the second slope 502.

[0075] The working process for this application is as follows:

[0076] When no negative pressure disturbance occurs, the oxygen barrier plate 16 floats between the lower limit ring 17 and the upper limit ring 18 along with the copper liquid level in the pressure stabilizing cylinder 3, and the telescopic tube 32 extends and retracts with the rise and fall of the oxygen barrier plate 16. The valve ball 51 blocks the valve hole 801, and the second air guide hole 55 is misaligned with the docking hole 802, preventing the protective gas from entering the gas supply branch and the downward drive branch through the valve shell 8. The second skirt 21 maintains its initial position, the follower valve block 57 does not move towards the third connecting pipe 62, the flow gap 63 maintains an undisturbed opening, and the copper liquid enters the crystallizer 6 through the second connecting pipe 13, the inlet protection pipe 4, the oxygen barrier pipe 5, and the third connecting pipe 62.

[0077] When negative pressure disturbance occurs at the inlet side of the crystallizer 6 due to traction molding, on the one hand, the negative pressure disturbance is transmitted to the flow gap 63 through the third connecting pipe 62 and the second flow channel 503, causing the follower valve block 57 to move towards the crystallizer 6, thus reducing the flow gap 63. On the other hand, the negative pressure in the inlet protection pipe 4 is transmitted to the valve housing 8 through the negative pressure pipe 9, causing the second piston 53 to move downward, the valve ball 51 to release the blockage of the valve hole 801, and the second air guide hole 55 to move to the position communicating with the docking hole 802. The protective gas enters the second branch pipe 12 through the gas supply pipe 7, the pressure replenishment main pipe 10, the valve housing 8, and the docking hole 802, and is then diverted to the first branch pipe 11 and the telescopic pipe 32.

[0078] Protective gas enters the inlet protective pipe 4 through the first branch pipe 11, replenishing the inlet protective pipe 4; the protective gas then enters the piston cylinder 33 through the telescopic pipe 32, pushing the first piston 34 downward. The first piston 34 drives the transmission rod 28 downward. The transmission rod 28 first locks the lifting position of the oxygen barrier plate 16 relative to the pressure stabilizing cylinder 3 through the swing rod 36, positioning rod 44, guide cylinder 47, and guide rod 48, and then drives the second base plate 24, the first base plate 20, and the second skirt 21 to descend, causing the second skirt 21 to enter the oxygen barrier position. Thus, when a traction negative pressure disturbance occurs, the replenishment of gas into the inlet protective pipe 4, the extension of the oxygen barrier path near the liquid inlet of the second connecting pipe 13, and the reduction of the flow gap 63 all occur simultaneously.

[0079] When the negative pressure disturbance weakens, the fifth spring 56 pushes the second piston 53 to reset, causing the valve ball 51 to re-seal the valve hole 801 and misaligning the second air guide hole 55 with the docking hole 802. The second spring 35 pushes the first piston 34 to reset, and the first spring 31, the third spring 43, and the fourth spring 46 provide the reset basis for the transmission rod 28, the support slider 39, and the positioning rod 44, respectively. As the second spring 35 pushes the first piston 34 to move upward and reset, the transmission rod 28 drives the swing rod 36 to deflect in the opposite direction, and the fixed block 42 moves away from the guide cylinder 47 along with the swing rod 36; the fourth spring 46 pushes the positioning rod 44 to retract along the third limiting groove 45 in the direction away from the positioning hole 49, so that the positioning rod 44 exits the positioning hole 49, the guide cylinder 47 and the guide rod 48 are released from the jamming, and the oxygen barrier plate 16 returns to a state where it can rise and fall with the liquid level of the copper liquid in the pressure stabilizing cylinder 3. The sixth spring 61 pushes the follower valve block 57 to reset, so that the flow gap 63 returns to the opening degree in the undisturbed state.

[0080] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application; any equivalent substitutions or modifications made by those skilled in the art without departing from the technical solutions defined in the claims shall fall within the scope of protection of this application.

[0081] It should be noted that if the embodiments of the application involve directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0082] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, if the embodiments of the application involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in the application.

Claims

1. A high-purity oxygen-free copper rod forming device, comprising a liquid supply cylinder (1), a flow stabilizing tank (2), a pressure stabilizing cylinder (3), an inlet protection pipe (4), an oxygen barrier pipe (5), and a crystallizer (6) connected sequentially along the copper liquid flow direction, wherein the inlet protection pipe (4) is connected to the bottom of the pressure stabilizing cylinder (3) via a second connecting pipe (13), and the crystallizer (6) is used to receive the copper liquid output from the oxygen barrier pipe (5) and crystallize the copper liquid to form a copper rod, characterized in that, Also includes: The oxygen barrier (16) is set inside the pressure stabilizing cylinder (3) and can rise and fall vertically with the copper liquid level inside the pressure stabilizing cylinder (3); The first skirt (19) is located on the bottom side of the oxygen barrier plate (16); The second skirt (21) is disposed lower relative to the oxygen barrier (16) and is located inside the first skirt (19); The negative pressure gas supply component is connected to the inlet protection pipe (4) and is used to supply protective gas to the inlet protection pipe (4) and drive the second skirt (21) to move downward relative to the oxygen barrier plate (16); Follower valve block (57) is movably disposed inside oxygen barrier pipe (5), and a flow gap (63) is formed between the follower valve block (57) and oxygen barrier pipe (5) to allow copper liquid to enter the crystallizer (6); When the liquid inlet side of the crystallizer (6) is subjected to negative pressure disturbance due to traction molding, the negative pressure disturbance is transmitted to the flow gap (63), causing the follower valve block (57) to move toward the crystallizer (6) to reduce the flow gap (63). The negative pressure gas replenishment component replenishes protective gas into the inlet protection pipe (4) and drives the second skirt (21) to descend to the oxygen isolation position relative to the oxygen isolation plate (16). At the oxygen isolation position, the bottom end of the second skirt (21) is lower than the bottom end of the first skirt (19), and the second skirt (21) is located above or circumferentially outside the liquid inlet of the second connecting pipe (13), so that the copper liquid flows around the outside of the second skirt (21) and enters the second connecting pipe (13).

2. The high-purity oxygen-free copper rod forming device according to claim 1, characterized in that, The negative pressure air supply assembly includes an air supply pipe (7), a valve housing (8), a negative pressure pipe (9), and a pneumatic actuator. The air supply pipe (7) is fixed to the top side of the pressure stabilizing cylinder (3) and connects to the inside of the pressure stabilizing cylinder (3). The air supply pipe (7) is connected to the air inlet end of the valve housing (8) through the pressure replenishment main pipe (10). The negative pressure pipe (9) connects to the inlet protection pipe (4) and the valve housing (8). The valve housing (8) has a docking hole (802) as the air outlet end. The docking hole (802) is connected to a second branch pipe (12). One of the second branch pipes (12) is connected to the inlet protection pipe (4) through the first branch pipe (11) to form an air replenishment branch. The first branch is used to introduce the protective gas in the valve body (8) into the inlet protective pipe (4); the other branch of the second branch pipe (12) is connected to the pneumatic actuator for transmission cooperation with the second skirt (21) and forms a downward drive branch, which is used to guide the protective gas in the valve body (8) to the pneumatic actuator; a switching element is provided in the valve body (8), which is used to block the connection between the air inlet end and the air outlet end of the valve body (8) when no negative pressure disturbance is generated on the liquid inlet side of the crystallizer (6), and to connect the air inlet end and the air outlet end of the valve body (8) when a negative pressure disturbance is generated on the liquid inlet side of the crystallizer (6).

3. The high-purity oxygen-free copper rod forming device according to claim 2, characterized in that, The switching component includes a second piston (53), a first connecting rod (52), and a valve ball (51). The second piston (53) is slidably sealed inside the valve housing (8). The first connecting rod (52) is connected to the second piston (53). The valve ball (51) is located at the end of the first connecting rod (52) away from the second piston (53). The valve housing (8) has a valve hole (801) located at its air inlet end. The valve ball (51) is used to block or open the valve hole (801). A first air guide hole (54) is opened on the top side of the second piston (53), and a first air guide hole (54) is opened on the side of the second piston (53) to connect with the first air guide hole (54). 4) A second air guide hole (55) is connected. When no negative pressure disturbance is generated, the second air guide hole (55) is misaligned with the docking hole (802) and moves to the position connected with the docking hole (802) when the valve ball (51) opens the valve hole (801); a fifth spring (56) is provided between the second piston (53) and the valve body (8). The fifth spring (56) is used to push the second piston (53) to reset after the negative pressure in the inlet protection tube (4) weakens, so that the valve ball (51) re-seals the valve hole (801) and the second air guide hole (55) is misaligned with the docking hole (802).

4. The high-purity oxygen-free copper rod forming device according to claim 2, characterized in that, The pneumatic actuator includes a piston cylinder (33) located above the oxygen barrier plate (16). The top side of the piston cylinder (33) is connected to the downward drive branch. A first piston (34) is provided in the piston cylinder (33). A transmission rod (28) connected to the second skirt (21) is fixed to the bottom side of the first piston (34). The protective gas entering the piston cylinder (33) through the downward drive branch acts on the first piston (34) so ​​that the first piston (34) drives the second skirt (21) to move downward through the transmission rod (28).

5. The high-purity oxygen-free copper rod forming device according to claim 4, characterized in that, The oxygen barrier plate (16) has a first sealing groove (23) and a second sealing groove (25) that are interconnected on its bottom and top sides, respectively. A first base plate (20) is slidably sealed in the first sealing groove (23), and the top of the second skirt (21) is fixed to the bottom side of the first base plate (20). A second base plate (24) is slidably sealed in the second sealing groove (25) and fixed to the top side of the first base plate (20). The top side of the second base plate (24) is in transmission cooperation with the bottom end of the transmission rod (28). A first limiting block (26) is provided on the outer wall of the second base plate (24), and a first limiting groove (27) that is slidably cooperates with the first limiting block (26) is axially opened on the side wall of the second sealing groove (25).

6. The high-purity oxygen-free copper rod forming device according to claim 5, characterized in that, The transmission rod (28) is provided with a second limiting block (29) at its bottom end, and a second limiting groove (30) is provided on the top side of the second base plate (24). The second limiting block (29) is located in the second limiting groove (30). A first spring (31) is sleeved on the outside of the transmission rod (28). The two ends of the first spring (31) are respectively fixed to the top side of the second limiting block (29) and the top side of the second limiting groove (30). When the transmission rod (28) is driven down by the first piston (34), the second limiting block (29) moves along the second limiting groove (30) first. The first spring (31) is stretched and the second limiting block (29) abuts against the bottom of the second limiting groove (30). The transmission rod (28) drives the second base plate (24), the first base plate (20) and the second skirt (21) to move down together. The forming device also includes a locking mechanism. When the second limiting block (29) moves towards the bottom of the second limiting groove (30), the locking mechanism is used to lock the lifting position of the oxygen barrier plate (16) relative to the pressure stabilizing cylinder (3) to limit the oxygen barrier plate (16) from continuing to rise and fall with the copper liquid level.

7. The high-purity oxygen-free copper rod forming device according to claim 6, characterized in that, The inner wall of the pressure stabilizing cylinder (3) is provided with a lower limit ring (17) and an upper limit ring (18). The lower limit ring (17) is located below the upper limit ring (18), and the oxygen barrier plate (16) is located between the lower limit ring (17) and the upper limit ring (18), and its stroke as the copper liquid level rises and falls is limited by the lower limit ring (17) and the upper limit ring (18).

8. The high-purity oxygen-free copper rod forming device according to claim 7, characterized in that, The locking mechanism includes a bracket (22) fixed to the top side of the oxygen barrier plate (16), a hanging rod (38) fixed to the bottom side of the bracket (22), an avoidance groove (40) parallel to the transmission rod (28) on the hanging rod (38), a support slider (39) slidably arranged in the avoidance groove (40), a third spring (43) between the bottom side of the support slider (39) and the bottom of the avoidance groove (40); a rotating shaft (41) is horizontally inserted and fixed on the support slider (39), an inclined swing rod (36) is rotatably sleeved on the outside of the rotating shaft (41), one end of the swing rod (36) is hinged to the outer wall of the transmission rod (28), and the other end of the swing rod (36) is fixed A fixed block (42) perpendicular to it is connected; a third limiting groove (45) is opened on the side of the fixed block (42) away from the swing rod (36), and a positioning rod (44) parallel to the swing rod (36) is slidably arranged in the third limiting groove (45). A fourth spring (46) is arranged between the top side of the positioning rod (44) and the top side of the third limiting groove (45); a guide cylinder (47) is fixed on the top side of the oxygen isolation plate (16), and a guide rod (48) is slidably inserted on the top of the guide cylinder (47). The top side of the guide rod (48) is fixed on the bottom side of the upper limit ring (18), and multiple positioning holes (49) that engage with the positioning rod (44) are axially opened on the outer wall of the guide rod (48).

9. The high-purity oxygen-free copper rod forming device according to claim 8, characterized in that, The guide cylinder (47) has an opening (50) for the positioning rod (44) to pass through. When the transmission rod (28) moves down, it drives the swing rod (36) to deflect, so that the positioning rod (44) is inserted into the positioning hole (49) through the opening (50) to lock the relative position of the guide cylinder (47) and the guide rod (48). The oxygen isolation plate (16) is also provided with a limit plate (37), which is used to limit the swing rod (36) to deflect to a horizontal state. When the transmission rod (28) moves up to reset, it drives the swing rod (36) to deflect in the opposite direction, so that the positioning rod (44) exits the positioning hole (49) to release the locking between the guide cylinder (47) and the guide rod (48).

10. The high-purity oxygen-free copper rod forming device according to claim 4, characterized in that, The piston cylinder (33) is connected to a telescopic tube (32) at the top. One end of the telescopic tube (32) is connected to the piston cylinder (33), and the other end of the telescopic tube (32) is fixed to the inner top wall of the pressure stabilizing cylinder (3) and connected to the downward driving branch. The telescopic tube (32) can extend and retract with the rise and fall of the oxygen barrier plate (16) relative to the pressure stabilizing cylinder (3) so that the oxygen barrier plate (16) can follow the rise and fall of the copper liquid level in the pressure stabilizing cylinder (3) when no negative pressure disturbance is generated on the liquid inlet side of the crystallizer (6).

11. The high-purity oxygen-free copper rod forming device according to claim 1, characterized in that, The oxygen-barrier pipe (5) has a first flow channel (501) and a second flow channel (503) sequentially opened along the copper liquid flow direction. The first flow channel (501) is connected to the inlet protection pipe (4), and the second flow channel (503) is connected to the crystallizer (6) through the third connecting pipe (62). The junction of the first flow channel (501) and the second flow channel (503) forms a second slope (502). The follower valve block (57) is set in the first flow channel (501) and has a first slope (58) opposite to the second slope (502). A flow gap (63) is formed between the first slope (58) and the second slope (502) to connect the first flow channel (501) and the second flow channel (503).

12. The high-purity oxygen-free copper rod forming device according to claim 11, characterized in that, A guide cone (59) is provided on the side of the follower valve block (57) away from the first slope (58). A slot (504) is also provided in the oxygen-barrier pipe (5). A second connecting rod (60) is slidably sealed in the slot (504). One end of the second connecting rod (60) is connected to the follower valve block (57). A sixth spring (61) is provided between the other end of the second connecting rod (60) and the groove wall of the slot (504). When the liquid inlet side of the crystallizer (6) generates negative pressure disturbance due to traction molding, the negative pressure disturbance acts on the first slope (58) and the flow gap (63) through the third connecting pipe (62) and the second flow channel (503), causing the follower valve block (57) to move towards the third connecting pipe (62) and compress the sixth spring (61). The first slope (58) moves closer to the second slope (502) so that the flow gap (63) is reduced.

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