A buried pipe casting pouring system and pouring method under deep metal liquid level

Abstract

The present invention relates to buried pipe casting and pipe protection technology, and specifically to a buried pipe casting pouring system and pouring method under deep metal liquid level. A buried pipe casting pouring system under deep metal liquid level, wherein a pre-buried pipe is provided at the bottom of the pouring cavity, the inlet end of the pre-buried pipe is connected to the medium box through a feed pipe, and the outlet end of the pre-buried pipe is connected to the medium box through a return pipe, and a mud pump is provided in the feed pipe. A plurality of agitators are provided in the medium box, the medium box is in a high-pressure state, and the medium box is filled with a cooling medium, which enters the buried pipe through the feed pipe and returns to the medium box through the return pipe. A metal hose is stuffed in the buried pipe, and a plurality of fixed rib rings are mounted on the outside of the metal hose in the axial direction, and a grid structure is provided on the fixed rib ring. This pouring system operates under pressure, and deformation of the buried pipe is avoided by stuffing the metal hose; cooling is performed by passing the cooling medium, thereby improving the casting success rate.

Description

Technical Field

[0001] The invention relates to a buried pipe casting and protection technology, and in particular to a buried pipe casting pouring system and a pouring method under a deep metal liquid level. Background Art

[0002] Cooling devices are typically installed inside high-temperature equipment such as blast furnace walls, slag outlets, tuyeres, inspection holes, reaction towers, slag retaining plates, oxygen-enriched smelting furnace flues, and metal crystallizers. These devices protect the equipment from high-temperature damage and extend its service life. These cooling devices are typically made of copper for rapid heat conduction. During manufacturing, cooling water channels are typically created in a specific copper shape. During use, cooling water flows through these channels, removing heat from the equipment and achieving a cooling effect.

[0003] Regarding the forming of the water flow cavity, the main method currently used is buried tube casting, that is, a pre-buried tube with the same shape as the water flow cavity is pre-placed in the forming cavity, and then molten copper is injected into the forming cavity. When the molten copper cools, the pre-buried tube and the molten copper become one. This method has high technical difficulties, mainly because: in order to achieve a good metallurgical bond between the pre-buried tube and the poured molten copper, the outer wall temperature of the pre-buried tube must reach its melting point, so that it can achieve metallurgical bonding with the poured liquid copper; and the inner wall temperature of the pre-buried tube must be lower than or even close to the melting point, so that it maintains its physical shape and does not soften, collapse, or even melt through, resulting in casting failure. Therefore, tube protection technology is required in the buried tube casting integrated molding process.

[0004] There are two main types of pipe protection technologies at present: one is to use high melting point alloys as embedded pipes. Due to the high melting point of embedded pipes, they are not easy to deform or collapse during the pouring process. However, in order to achieve metallurgical bonding between the outer wall of the embedded pipe and the poured liquid copper, the pouring temperature has to be increased, which increases the heating cost expenditure; and the cooling device after molding has a low heat transfer efficiency due to the casting base material being copper and the embedded pipe being a copper alloy. The thermal conductivity of the copper alloy is lower than that of pure copper. Another pipe protection technology is to embed pure copper pipes, and fill the embedded pipes with flowing medium during the pouring process to absorb part of the heat of the liquid metal, so that the temperature of the inner wall of the embedded pipe is not close to the temperature of the liquid copper, thus protecting the embedded pipe from deformation. However, when this method is applied to thick and large parts or when a section of the embedded pipe is located at a deep liquid level and under heavy pressure, the embedded pipe at this position is prone to deformation under the dual effects of gravity and the rise in the temperature of the embedded pipe, resulting in pouring failure. For example Figure 1 As shown, the water flow cavity rotates three-dimensionally in the cooling equipment. No matter how the pouring direction and angle of the casting are adjusted, there is always a section of the embedded pipe that is easily collapsed under the buried pressure of the deep liquid level. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a buried pipe casting pouring system and pouring method under deep metal liquid level. The pouring system operates under pressure to prevent the embedded pipe from softening and deforming due to buried pressure at deep metal liquid level; and a metal hose is filled in the embedded pipe to increase the speed of the medium in the pipe, effectively reducing the temperature inside the embedded pipe; the embedded pipe is cooled by passing a cooling medium between the embedded pipe and the metal hose; the above measures overcome the difficulties in buried pipe casting under deep metal liquid level and improve the casting success rate.

[0006] In order to solve the problems of the existing technology, the present invention discloses a buried pipe casting pouring system under deep metal liquid level, including a pouring cavity, a pre-buried pipe is arranged at the bottom of the pouring cavity, the inlet end of the pre-buried pipe is connected to the medium box through a feed pipe, and the outlet end of the pre-buried pipe is connected to the medium box through a return pipe, and a mud pump is arranged in the feed pipe.

[0007] The medium box is connected to the air compressor, and multiple agitators are arranged in the medium box. The medium box is in a high-pressure state and is filled with a cooling medium. The cooling medium enters the embedded pipe through the feed pipe under high pressure and returns to the medium box through the return pipe.

[0008] The inlet end and the outlet end of the embedded pipe are respectively connected to the feed pipe and the return pipe through a flexible joint. A metal hose is stuffed in the embedded pipe. Both ends of the metal hose are provided with fixed hard pipes, and the fixed hard pipes are fixedly connected to the inlet end and the outlet end of the embedded pipe. A plurality of fixed rib rings are sleeved on the outside of the metal hose along the axial direction. The sum of the diameters of the fixed rib ring and the metal hose is smaller than the inner diameter of the embedded pipe. A grid structure is provided on the fixed rib ring.

[0009] Preferably, the multiple agitators in the medium box are arranged in an array. In the horizontal projection direction, the agitators include outer agitators projected on the same circle and evenly spaced and a central agitator located at the center of the circle. In the vertical direction, the multiple agitators are located at different heights of the liquid surface in the medium box.

[0010] Preferably, five agitators are provided in the medium box, including four agitators on the outside and one agitator located in the center, wherein in the horizontal direction, the axes of the four outer agitators are projected on the same circle, and the axis of the agitator located in the center is projected at the center of the circle, and the angle between two adjacent outer agitators is 90°, wherein in the vertical direction, the four outer agitators are grouped into two groups to form two groups of agitators, and the two groups of agitators are respectively located at 1 / 4 depth and 3 / 4 depth of the liquid surface of the medium box, and the central agitator is located at 1 / 2 depth of the liquid surface of the medium box.

[0011] Preferably, the cooling medium is a mixture of a non-flammable and highly viscous organic mixture and fine sand.

[0012] Preferably, the cooling medium comprises 10-20% polyvinyl alcohol, 10-20% sodium polyacrylate, 1-5% methyl cellulose, 1-5% polydimethylsiloxane, 30-50% water and 5-15% fine sand.

[0013] Preferably, a spare mud pump and a stop valve are further provided in the feed pipeline, and a stop valve, a regulating valve and a pressure gauge are provided on the return pipeline.

[0014] Preferably, the feed pipe is provided with a feed guide plate at the inlet position in the medium box, and the feed guide plate is provided with rectangular feed guide holes arranged radially; the return pipe is provided with a return guide plate at the outlet position in the medium box, and the return guide plate is provided with fan-shaped return guide ports distributed radially.

[0015] Preferably, the stirrer is driven to rotate by a stirring motor, the stirring motor is provided with an upper portion of a medium box, a motor sealing box is provided on the outside of the stirring motor, and the motor sealing box is connected to a variable frequency fan.

[0016] A method for casting a buried pipe under a deep metal liquid level, comprising the following steps:

[0017] (1) Insert the metal hose into the pre-buried pipe and fix the two ends of the metal hose at the inlet and outlet of the pre-buried pipe respectively. Then, under the action of gravity, the bottom of the fixed rib ring of the metal hose contacts the inner wall of the pre-buried pipe, while the top of the fixed rib ring is at a distance from the inside of the pre-buried pipe.

[0018] (2) using an air compressor to increase the gas pressure in the medium box to 10 atmospheres, and using the air compressor to maintain the pressure in the medium box, and turning on the agitator in the medium box to stir the cooling medium in the medium box;

[0019] (3) The evenly stirred cooling medium enters the feed pipe, and the slurry pump is used to pressurize the cooling medium in the embedded pipe and stabilize it at 10 atmospheres, and then pouring the casting begins;

[0020] (4) Liquid copper is poured into the casting cavity, and the cooling medium also flows under pressure between the embedded pipe and the metal hose, and returns to the medium box from the return pipe;

[0021] (5) After the pouring is completed and the cooling medium has all returned to the medium box, the metal hose is separated from the embedded pipe and the metal hose is pulled out from the embedded pipe to complete the casting of the deep metal liquid level embedded pipe.

[0022] Preferably, the variable frequency fan pressurizes the motor sealing box and maintains the pressure in the motor sealing box at 10 atmospheres.

[0023] The beneficial effects of the present invention are:

[0024] 1. The system uses a high-viscosity fluid mixed with fine sand as the cooling medium flowing in the embedded pipe during embedded pipe casting, and the cooling medium maintains a pressure of about 10 atmospheres during the flow, thereby resisting the heavy pressure of the deep metal liquid level on the embedded pipe during the pouring process and improving the casting success rate.

[0025] 2. A metal hose is stuffed into the pre-buried pipe. Under the action of gravity, the bottom of the metal hose contacts the inner wall of the pre-buried pipe, while the upper part is separated from the inside of the pre-buried pipe. This achieves the effect of more cooling medium flowing in the upper part of the pre-buried pipe and less cooling medium flowing in the lower part of the pre-buried pipe, solving the problem of high temperature in the upper part of the pre-buried pipe caused by the deep metal liquid level. The stuffing of the metal hose can increase the flow rate of the cooling medium, strengthen convection, remove more heat per unit time, reduce the temperature inside the pre-buried pipe, and avoid deformation and other problems of the pre-buried pipe.

[0026] 3. Agitators arranged in arrays in horizontal and vertical directions are set in the medium box, and feed guide plates and discharge guide plates are added to the feed pipe and return pipe, which can make the cooling medium fully and evenly mixed and improve the cooling effect.

[0027] 4. The cooling medium uses non-flammable and highly viscous organic matter to prevent safety accidents in extreme cases when the embedded pipe is melted through. Fluids with high viscosity are more likely to carry sand, and adding fine sand to the organic matter can increase the flow stiffness of the cooling medium, which is beneficial for the embedded pipe to withstand the heavy pressure brought by the deep metal liquid level.

[0028] 5. The system operates under pressure throughout the entire process and can effectively withstand the heavy pressure in the embedded pipe. The pressure in the medium box is maintained by the air compressor, the pressure in the motor sealing box above the medium box is maintained by the frequency conversion fan, and the pressure in the feed pipe is maintained by the mud pump, which can effectively ensure the pressure of the cooling medium during the flow process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of an application scenario of the present invention;

[0030] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 3 It is a structural diagram of the metal hose in the present invention;

[0032] Figure 4 It is a structural schematic diagram of the fixed rib ring in the present invention;

[0033] Figure 5This is a schematic diagram of the connection between the metal hose and the embedded pipe in the present invention;

[0034] Figure 6 Schematic diagram of the horizontal distribution of the agitator in the present invention;

[0035] Figure 7 It is a structural schematic diagram of the feed guide plate in the present invention;

[0036] Figure 8 It is a structural schematic diagram of the return material guide plate in the present invention.

[0037] Reference numerals:

[0038] 1. Cooling equipment; 2. Pre-buried pipes; 3. Casting cavity; 4. Feed pipe; 5. Medium box; 6. Return pipe; 7. Mud pump; 8. Air compressor; 9. Agitator; 10. Spare mud pump; 11. Stop valve; 12. Regulating valve; 13. Pressure gauge; 14. Agitator motor; 15. Motor sealing box; 16. Variable frequency fan; 17. Union joint; 18. Metal hose; 19. Fixed hard pipe; 20. Fixed rib ring; 21. Feed guide plate; 22. Feed guide hole; 23. Return guide plate; 24. Return guide port; 25. Support rod; 26. Column; 27. Reducer. DETAILED DESCRIPTION

[0039] The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0040] like Figure 1 As shown, the water flow channel rotates three-dimensionally around the four bottom edges at the bottom of the cooling device 1. No matter how the pouring direction and angle of the casting are adjusted, there is always a section of the embedded pipe 2 that is easily collapsed under the buried pressure of the deep liquid level.

[0041] like Figure 2 As shown, a buried pipe casting pouring system under deep metal liquid level includes a pouring cavity 3, a pre-buried pipe 2 is arranged at the bottom of the pouring cavity 3, the inlet end of the pre-buried pipe 2 is connected to the medium box 5 through a feed pipe 4, and the outlet end of the pre-buried pipe 2 is connected to the medium box 5 through a return pipe 6, and a mud pump 7 is arranged in the feed pipe 4.

[0042] The medium box 5 is connected to the air compressor 8, and multiple agitators 9 are arranged in the medium box 5. The medium box 5 is in a high-pressure state and is filled with a cooling medium. The cooling medium enters the embedded pipe 2 through the feed pipe 4 under high pressure and returns to the medium box 5 through the return pipe 6.

[0043] The cooling medium is a mixture of a non-flammable and highly viscous organic mixture and fine sand, and the cooling medium includes 10-20% polyvinyl alcohol, 10-20% sodium polyacrylate, 1-5% methyl cellulose, 1-5% polydimethylsiloxane, 30-50% water and 5-15% fine sand.

[0044] A standby mud pump 10 and a stop valve 11 are also provided in the feed pipeline 4 , and a stop valve 11 and a regulating valve 12 are provided on the return pipeline 6 .

[0045] The stirrer 9 is driven to rotate by a stirring motor 14 . The stirring motor 14 is provided on the upper portion of the medium box 5 . A motor sealing box 15 is provided outside the stirring motor 14 . The motor sealing box 15 is connected to a variable frequency fan 16 .

[0046] like Figure 3-5 As shown, the inlet end and the outlet end of the embedded pipe 2 are respectively connected to the feed pipe 4 and the return pipe 6 through a flexible joint 17, and a metal hose 18 is stuffed in the embedded pipe 2. Both ends of the metal hose 18 are provided with fixed hard pipes 19, and the fixed hard pipes 19 are fixedly connected to the inlet end and the outlet end of the embedded pipe 2. A plurality of fixed rib rings 20 are sleeved on the outside of the metal hose 18 along the axial direction. The sum of the diameters of the fixed rib rings 20 and the metal hose 18 is smaller than the inner diameter of the embedded pipe 2, and a grid structure is provided on the fixed rib rings 20.

[0047] The metal hose 18 is a flexible conduit made of metal that is bendable, pressure-resistant, and sealable, making it widely used in industries such as industry, construction, and energy. Its shape is variable and can be deformed to match the shape of the embedded pipe 2. After filling part of the cross-sectional area of ​​the embedded pipe 2, it can increase the flow rate of the cooling medium within the embedded pipe 2, remove more heat, reduce the temperature within the embedded pipe 2, and protect the embedded pipe 2 from softening and deformation. Because the combined diameter of the metal hose 18 and its external fixed rib ring 20 is smaller than the diameter of the embedded pipe 2, and under the action of gravity, the bottom of the external fixed rib ring 20 of the metal hose 18 contacts the inner wall of the embedded pipe 2, while the upper part is spaced apart from the inner wall of the embedded pipe 2, forming an eccentric filling. This creates a situation where the cooling medium has more space to flow in the upper part of the embedded pipe 2 and less space to flow in the lower part of the embedded pipe 2. This precisely solves the problem of high temperatures in the upper part of the embedded pipe 2 caused by the deep liquid metal level.

[0048] The retaining ribs 20 installed on the exterior of the metal hose 18 ensure that the metal hose 18 does not bottom out directly inside the embedded tube 2. If the metal hose 18 bottoms out, there will be no space between them, and the cooling medium will no longer flow, which will deteriorate heat transfer in that area and exacerbate softening and deformation of the embedded tube 2 at that location. The retaining ribs 20 are solid where they connect to the metal hose 18, ensuring connection strength. The remaining locations have a lattice structure to facilitate the flow of cooling medium.

[0049] Since the metal hose 18 extends along the axial direction of the embedded pipe 2 and the entire system is operated under pressure, the flowing cooling medium will flow at a high speed, which will inevitably cause the metal hose 18 to move within the embedded pipe 2. Therefore, the metal hose 18 must be fixed. In this application, a fixed hard pipe 19 is added to each end of the metal hose 18, and the outer surface of the fixed hard pipe 19 is welded to the inner wall of the embedded pipe 2, thereby achieving a stable connection between the embedded pipe 2 and the two ends of the metal hose 18.

[0050] In actual application, the outer diameter of the metal hose 18 is 1 / 2 of the inner diameter of the embedded pipe 2, and the sum of the diameters of the metal hose 18 and the fixed rib ring 20 is 3 / 4 of the inner diameter of the embedded pipe 2. Therefore, 1 / 4 of the space distance is reserved between the top of the metal hose 18 and the embedded pipe 2.

[0051] like Figure 5 and Figure 6 As shown, five agitators 9 are provided in the medium box 5, including four agitators 9 on the outside and one agitator 9 located in the center, wherein in the horizontal direction, the centers of the four outer agitators are projected on the same circumference, while the center of the agitator located in the center is projected at the center of the circumference, and the angle between two adjacent outer agitators is 90°; wherein in the vertical direction, the four outer agitators 9 are in the form of a group of two, forming two groups of agitators 9, and the two groups of agitators 9 are respectively located at 1 / 4 depth and 3 / 4 depth of the liquid surface of the medium box 5, and the agitator 9 in the center is located at 1 / 2 depth of the liquid surface of the medium box 5.

[0052] like Figure 7 and Figure 8As shown, the feed pipe 4 is provided with a feed guide plate 21 at the inlet of the medium box 5. The feed guide plate 21 is provided with radially arranged rectangular feed guide holes 22. The return pipe 6 is provided with a return guide plate 23 at the outlet of the medium box 5. The return guide plate 23 is provided with radially distributed fan-shaped return guide openings 24. The middle of the feed guide plate 21 and the return guide plate 23 are both solid structures. The fan-shaped arcuate return guide openings 24 on the feed guide plate 21 allow the returning cooling medium to enter the medium box 5 in a vortex shape, consistent with the stirring direction of the agitator 9, thereby improving stirring efficiency. The feed guide plate 21 and the return guide plate 23 are provided with columns 26, which are welded to the feed pipe 4 and the return pipe 6, respectively, to connect the feed guide plate 21 to the feed pipe 4, and the return guide plate 23 to the return pipe 6.

[0053] In the present invention, on the one hand, it is necessary to resist the heavy pressure of deep liquid level metal, and on the other hand, it is necessary to resist the high temperature of liquid copper. The cooling medium is made to flow under pressure and the cooling medium uses high viscosity and carries fine sand, both of which are for resisting the heavy pressure of deep liquid level metal. The high temperature of liquid copper is resisted and the temperature in the embedded pipe 2 is reduced by the continuous circulation of the cooling medium. During pouring, the embedded pipe 2 is filled with a metal hose 18, and a fixed rib ring 20 is provided on the outside of the metal hose 18 to block part of the cross-section of the embedded pipe 2. The flow rate of the cooling medium is increased, and the heat in the embedded pipe 2 can be taken away faster.

[0054] The working principle of the present invention is as follows: cooling medium is introduced into the medium box 5, where it is mixed uniformly by the action of the stirrer 9. The internal pressure of the medium box 5 reaches 10 atmospheres by the action of the air compressor 8. The mixed cooling medium enters the embedded pipe 2 through the feed pipe 4. To ensure the pressure and flow of the cooling medium in the feed pipe 4, a mud pump 7 is provided on the feed pipe 4. To ensure the stable operation of the system, a spare mud pump 10 can also be prepared. After entering the embedded pipe 2, the cooling medium flows in the space between the top of the embedded pipe 2 and the metal hose 18, and in the grid structure of the fixed rib ring 20 outside the metal hose 18. To ensure that the cooling medium enters the embedded pipe 2 at a high flow rate, a reducing end 27 is provided at the inlet and outlet of the embedded pipe 2. The diameter of the reducing end 27 gradually increases from the feed pipe 4 and the return pipe 6 to the embedded pipe 2. According to the Bernoulli equation, the flow rate of the cooling medium gradually increases as it flows from a narrow area to a wide area. In order to ensure the fixation of the embedded pipe 2, a support rod 25 is provided between the bottom of the embedded pipe 2 and the bottom plate of the casting cavity 3, and the reducing ends 27 at the inlet and outlet positions of the embedded pipe 2 are respectively connected to the feed pipe 4 and the return pipe 6 through the flexible joints 17. When the casting is completed, the flexible joints 17 can be unscrewed to disassemble the embedded pipe 2 from the feed pipe 4 and the return pipe 6 respectively, and the metal hose 18 can be pulled out from the embedded pipe 2.

[0055] Regarding the pressurized operation of the system, the system maintains a pressure of 10±0.5 atmospheres during the pouring process, and the agitator 9 in the medium box 5 is driven by the stirring motor 14 to rotate the stirring shaft. There must be a gap between the stirring shaft and the top wall of the medium box 5. During the rotation, the air in the medium box 5 will overflow outward, causing the pressure in the medium box 5 to decrease. On the one hand, the air compressor 8 is used to supplement the pressure in the medium box 5, and on the other hand, a motor sealing box 15 is set on the outside of the stirring motor 14. The motor sealing box 15 is connected to the frequency conversion fan 16, and the frequency conversion fan 16 ventilates the motor sealing box 15 to maintain the pressure in the motor sealing box 15, thereby ensuring the pressure in the medium box 5 and cooling the stirring motor 14 at the same time.

[0056] The present invention also includes another aspect, a method for casting buried pipes under a deep metal liquid level, comprising the following steps: (1) inserting a metal hose 18 into the buried pipe 2, and fixing the two ends of the metal hose 18 to the inlet and outlet ends of the buried pipe 2, respectively, so that under the action of gravity, the bottom of the fixed rib ring 20 of the metal hose 18 contacts the inner wall of the buried pipe 2, and there is a distance between the top of the fixed rib ring 20 and the inside of the buried pipe 2; (2) using an air compressor 8 to increase the gas pressure in the medium box 5 to 10 atmospheres, and using the air compressor 8 to maintain the pressure in the medium box 5, and turning on the agitator 9 in the medium box 5 The cooling medium in the medium box 5 is stirred; (3) the uniformly stirred cooling medium enters the feed pipe 4, and the slurry pump 7 is used to pressurize the cooling medium in the embedded pipe 2 and stabilize it at 10 atmospheres, and the casting begins; (4) liquid copper is poured into the casting cavity 3, and the cooling medium also flows under pressure between the embedded pipe 2 and the metal hose 18, and returns to the medium box 5 from the return pipe 6; (5) until the casting is completed and the cooling medium has all returned to the medium box 5, the metal hose 18 is separated from the embedded pipe 2, and the metal hose 18 is pulled out of the embedded pipe 2, completing the casting of the deep metal liquid level embedded pipe 2.

[0057] The variable frequency fan 16 pressurizes the motor sealing box 15 and maintains the pressure in the motor sealing box 15 at 10 atmospheres.

[0058] Obviously, various regulating valves 12, stop valves 11, flow meters and pressure gauges 13, etc. need to be installed on each pipeline and equipment to control and detect the flow and state of the cooling medium. This is something that can be clearly understood by those skilled in the art, so it will not be described in detail. When in use, insert the metal hose 18 into the embedded pipe 2 and fix both ends of the two. Then put the embedded pipe 2 into the designated position and connect the embedded pipe 2 with the feed pipe 4 and the return pipe 6. Then, when the agitator 9 is not working, ensure the sealing between the medium box 5, the motor sealing box 15, the feed pipe 4 and the return pipe 6. Then close the valves of the feed pipe 4 and the return pipe 6, and use the air compressor 8 and the variable frequency fan 16 to pressurize the medium box 5 and the motor sealing box 15 until the pressure gauge 13 shows 10±0 .5 atmospheres and maintain it continuously; start the agitator 9 to begin stirring. Once the system pressure stabilizes at the desired level and the cooling medium is fully uniform, open the valves on the feed pipe 4 and return pipe 6 and start the mud pump 7. The cooling medium in the feed pipe 4 and return pipe 6 will flow, injecting liquid copper into the casting cavity 3 to cast the casting; after the casting is completed, close the valves at both ends of the embedded pipe 2, remove the flexible joints 17 at both ends of the embedded pipe 2, and remove the metal hose 18 in the embedded pipe 2. This completes one casting process. Then place a new embedded pipe 2 into the casting cavity 3, connect the system, and cast the next casting.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A deep metal level buried pipe casting pouring system, comprising a pouring cavity, with a pre-buried pipe arranged at the bottom of the pouring cavity, characterized in that: The inlet end of the embedded pipe is connected to the medium box through a feed pipe, and the outlet end of the embedded pipe is connected to the medium box through a return pipe. A mud pump is provided in the feed pipe. The medium box is connected to the air compressor, and a plurality of stirrers are arranged in the medium box. The medium box is in a high-pressure state and is filled with a cooling medium. The cooling medium enters the pre-buried pipe through the feed pipe under high pressure and returns to the medium box through the return pipe. The inlet and outlet ends of the embedded pipe are respectively connected to the feed pipe and the return pipe through flexible joints. A metal hose is stuffed in the embedded pipe. Both ends of the metal hose are provided with fixed hard pipes, and the fixed hard pipes are fixedly connected to the inlet and outlet ends of the embedded pipe. A plurality of fixed rib rings are sleeved on the outside of the metal hose in the axial direction. The sum of the diameters of the fixed rib rings and the metal hose is smaller than the inner diameter of the embedded pipe. A grid structure is provided on the fixed rib rings. Under the action of gravity, the bottom of the fixed rib ring of the metal hose contacts the inner wall of the embedded pipe, while the top of the fixed rib ring is at a distance from the inside of the embedded pipe, and the cooling medium flows under pressure between the embedded pipe and the metal hose.

2. The deep metal liquid level buried pipe casting pouring system according to claim 1, characterized in that: The multiple agitators in the medium box are arranged in an array. In the horizontal projection direction, the agitators include outer agitators projected on the same circle and evenly spaced and a central agitator located at the center of the circle. In the vertical direction, the multiple agitators are located at different heights of the liquid surface in the medium box.

3. The deep metal liquid level buried pipe casting pouring system according to claim 2, characterized in that: The medium box is provided with 5 agitators, including 4 agitators on the outside and one agitator in the center. In the horizontal direction, the axes of the four outer stirrers are projected on the same circumference, while the axis of the stirrer located in the center is projected at the center of the circumference. The angle between two adjacent outer stirrers is 90°. In the vertical direction, two of the four outer agitators form a group, forming two groups of agitators. The two groups of agitators are respectively located at 1 / 4 depth and 3 / 4 depth of the liquid surface of the medium box, and the central agitator is located at 1 / 2 depth of the liquid surface of the medium box.

4. The deep metal liquid level buried pipe casting pouring system according to claim 1, characterized in that: The cooling medium is a mixture of a non-flammable and highly viscous organic mixture and fine sand.

5. The deep metal liquid level buried pipe casting pouring system according to claim 4, characterized in that: The cooling medium comprises 10-20% of polyvinyl alcohol, 10-20% of sodium polyacrylate, 1-5% of methyl cellulose, 1-5% of polydimethylsiloxane, 30-50% of water and 5-15% of fine sand.

6. The deep metal liquid level buried pipe casting pouring system according to claim 1, characterized in that: The feed pipeline is also provided with a spare mud pump and a stop valve, and the return pipeline is provided with a stop valve and a regulating valve.

7. The deep metal liquid level buried pipe casting pouring system according to claim 1, characterized in that: The feed pipe is provided with a feed guide plate at the inlet position in the medium box, and the feed guide plate is provided with feed guide holes arranged radially; the return pipe is provided with a return guide plate at the outlet position in the medium box, and the return guide plate is provided with fan-shaped return guide ports distributed radially.

8. A method for deep-metal-level buried pipe casting using a deep-metal-level buried pipe casting pouring system according to any one of the preceding claims, characterized in that: The following steps are involved: (1) Insert the metal hose into the pre-buried pipe and fix the two ends of the metal hose at the inlet and outlet of the pre-buried pipe respectively. Then, under the action of gravity, the bottom of the fixed rib ring of the metal hose contacts the inner wall of the pre-buried pipe, while the top of the fixed rib ring is at a distance from the inside of the pre-buried pipe. (2) using an air compressor to increase the gas pressure in the medium box to 10 atmospheres, and using the air compressor to maintain the pressure in the medium box, and turning on the agitator in the medium box to stir the cooling medium in the medium box; (3) The evenly stirred cooling medium enters the feed pipe, and the slurry pump is used to pressurize the cooling medium in the embedded pipe and stabilize it at 10 atmospheres, and then pouring the casting begins; (4) Liquid copper is poured into the casting cavity, and the cooling medium also flows under pressure between the embedded pipe and the metal hose, and returns to the medium box from the return pipe; (5) After the pouring is completed and the cooling medium has all returned to the medium box, the metal hose is separated from the embedded pipe and the metal hose is pulled out from the embedded pipe to complete the casting of the deep metal liquid level embedded pipe.

9. The method for casting a buried pipe at a deep metal level according to claim 8, characterized in that: The stirrer is driven to rotate by a stirring motor, and the stirring motor is arranged on the upper part of the medium box. A motor sealing box is arranged outside the stirring motor, and the motor sealing box is connected to a variable frequency fan; the variable frequency fan pressurizes the motor sealing box and maintains the pressure inside the motor sealing box at 10 atmospheres.

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