Anti-oxidation protection device for continuous casting of zinc alloy ingot

Abstract

The utility model discloses an anti-oxidation protection device for zinc alloy ingot continuous casting, which comprises a positioning base plate, the top of the positioning base plate is fixedly connected with a lower die, the top of the lower die is provided with an upper die, the top of the positioning base plate is provided with a sealing cover, the lower die and the upper die are both located in the sealing cover, and the sealing cover is provided with a sealing groove. The side wall of one side of the sealing cover fixedly communicates with an air inlet pipe, one end of the air inlet pipe is connected with an air inflation assembly, and through cooperative use of the positioning base plate, the sealing cover, the air inlet pipe, the air inflation assembly, the air outlet pipe and the air exhaust assembly, the sealing cover and the positioning base plate form a relatively sealed space environment. According to the zinc alloy casting device, air in the sealing cover is exhausted through the air exhaust assembly, then the sealing cover is filled with inert gas through the air inflation assembly, so that the phenomenon of oxidation in the zinc alloy casting process can be prevented, meanwhile, the utilization rate of the inert gas can be increased, the oxygen content in the sealing cover can be conveniently controlled, and the device is easy and rapid to operate.

Description

Technical Field

[0001] This utility model relates to the field of zinc alloy ingot casting technology, specifically to an anti-oxidation protection device for continuous casting of zinc alloy ingots. Background Technology

[0002] Zinc alloys are non-ferrous metal materials formed by adding alloying elements such as aluminum, copper, and magnesium to zinc as the base metal. Due to their excellent casting fluidity, mechanical properties, and corrosion resistance, they are widely used in precision die casting fields such as automotive parts, building hardware, and electronic components. The current continuous casting process for zinc alloy ingots includes three stages: melting, casting, and gradient cooling. During the ladle transfer, mold pouring, and pre-solidification settling process, the molten alloy is continuously exposed to air. Especially in the phase transformation temperature range of 380-420℃, the oxidation rate of the zinc melt surface can reach 2-5 μm / min, forming a grayish-white oxide layer that degrades processing performance.

[0003] Existing anti-oxidation technologies using inert / reducing gases have significant drawbacks: open gas spray designs result in low gas utilization due to turbulent flow during ladle movement and disturbances during mold opening and closing; single-point gas supply mode leads to excessive oxygen content in edge areas; and the temperature field disturbance in the mold causes changes in the gas volume expansion rate, forcing excessive gas supply for compensation, yet it is still difficult to maintain the oxygen content control standard. Therefore, we need to propose an anti-oxidation protection device for continuous casting of zinc alloy ingots. Utility Model Content

[0004] The purpose of this invention is to provide an anti-oxidation protection device for continuous casting of zinc alloy ingots, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An anti-oxidation protection device for continuous casting of zinc alloy ingots includes a positioning base plate, a lower mold fixedly connected to the top of the positioning base plate, an upper mold disposed on the top of the lower mold, a sealing cover disposed on the top of the positioning base plate, the lower mold and the upper mold being located inside the sealing cover, an air inlet pipe fixedly connected to one side wall of the sealing cover, one end of the air inlet pipe being connected to an air filling component for filling the interior of the sealing cover with inert gas, and an air outlet pipe fixedly connected to one side of the sealing cover from the air inlet pipe, one end of the air outlet pipe being connected to an air extraction component for discharging air from inside the sealing cover.

[0007] Preferably, the air extraction assembly includes a first telescopic hose, one end of which is fixedly connected to one end of the air outlet pipe, and the other end of which is fixedly connected to a vacuum pump.

[0008] Preferably, a mounting bracket is fixedly connected to the top of the vacuum pump, and the mounting bracket is fixedly installed on the bottom of the positioning base plate.

[0009] Preferably, the inflation assembly includes a second telescopic hose, one end of which is fixedly connected to one end of the air inlet pipe, and the other end of which is fixedly connected to a delivery pump, one end of which is connected to a storage container.

[0010] Preferably, the storage container is fixedly installed on the bottom of the positioning base plate, and the delivery pump is in communication with the interior of the storage container.

[0011] Preferably, a sealing block is fixedly connected to the top of the positioning base plate, and the bottom of the sealing cover is snapped into the inside of the sealing block.

[0012] Preferably, four sets of guide posts are fixedly connected to the top of the positioning base plate, and two sets of protrusions are fixedly connected to the two side walls of the sealing cover, with the guide posts slidably inserted into the protrusions.

[0013] Preferably, the top of the sealing cover has a through hole, and the top of the upper mold is fixedly connected to a casting pipe adapted to the through hole, the casting pipe being slidably inserted into the inside of the through hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention utilizes a positioning base plate, a sealing cover, an air inlet pipe, an inflation component, an air outlet pipe, and an air extraction component in combination. The sealing cover and the positioning base plate form a relatively sealed space environment. First, the air extraction component removes the air from inside the sealing cover, and then the inflation component fills the inside of the sealing cover with inert gas. This prevents oxidation during the zinc alloy casting process, improves the utilization rate of inert gas, and facilitates the control of the oxygen content inside the sealing cover. The device is simple and quick to operate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the axial side structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the positioning substrate and sealing cover of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the sealing cover, the air extraction component, and the air inflation component of this utility model.

[0020] In the figure: 1. Positioning base plate; 2. Lower mold; 3. Upper mold; 4. Sealing cover; 5. Air inlet pipe; 6. Inflation assembly; 601. Second telescopic hose; 602. Delivery pump; 603. Storage container; 7. Air outlet pipe; 8. Air extraction assembly; 801. First telescopic hose; 802. Vacuum pump; 9. Mounting bracket; 10. Sealing block; 11. Guide post; 12. Protrusion; 13. Through hole; 14. Casting pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 This utility model provides a technical solution:

[0023] An anti-oxidation protection device for continuous casting of zinc alloy ingots includes a positioning base plate 1. The positioning base plate 1 is made of a 20mm thick Q235B steel plate, with reinforcing ribs welded to the bottom (rib height 15mm, spacing 150mm). This achieves the mechanical strength required to support the total weight of the casting mold system of 2.3 tons. Its flatness is controlled within ±0.05mm / m to ensure the accuracy of the installation reference surface of the lower mold 2. The base plate surface is coated with a 0.2mm thick aluminum-silicon alloy high-temperature resistant coating, maintaining structural stability at 300℃. The lower mold 2 is fixedly connected to the top of the positioning base plate 1, and an upper mold 3 is located on top of the lower mold 2. A sealing cover 4 is located on top of the positioning base plate 1, with both the lower mold 2 and the upper mold 3 inside the sealing cover 4. An air inlet pipe 5 is fixedly connected to one side wall of the sealing cover 4. One end of the air inlet pipe 5 is connected to an inflation component 6 that fills the interior of the sealing cover 4 with inert gas. The sealing cover 4 is fixedly connected to an outlet pipe 7 on one side of the air inlet pipe 5. One end of the outlet pipe 7 is connected to an exhaust component 8 for venting the air inside the sealing cover 4. By setting up the positioning base plate 1, the sealing cover 4, the air inlet pipe 5, the inflation component 6, the outlet pipe 7 and the exhaust component 8 in cooperation, the sealing cover 4 and the positioning base plate 1 form a relatively sealed space environment. First, the air inside the sealing cover 4 is vented by the exhaust component 8, and then the interior of the sealing cover 4 is filled with inert gas by the inflation component 6. This can prevent oxidation during the zinc alloy casting process, improve the utilization rate of inert gas, and facilitate the control of the oxygen content inside the sealing cover 4. The device is simple and quick to operate.

[0024] The air extraction assembly 8 includes a first telescopic hose 801, one end of which is fixedly connected to one end of the air outlet pipe 7, and the other end of which is fixedly connected to a vacuum pump 802, which can exhaust the air inside the sealing cover 4.

[0025] A mounting bracket 9 is fixedly connected to the top of the vacuum pump 802. The mounting bracket 9 is fixedly installed on the bottom of the positioning base plate 1. By setting a two-stage rotary vane vacuum pump 802 (ultimate vacuum degree 5×10-2Pa, pumping speed 40m3 / h), and cooperating with the bellows structure of the first telescopic hose 801 (axial extension ±150mm), the ability to pump the volume (2.8m3) of the sealing cover 4 to a low pressure state of 5kPa within 3 minutes is achieved, creating a negative pressure environment for subsequent inert gas filling.

[0026] The inflation assembly 6 includes a second telescopic hose 601, one end of which is fixedly connected to one end of the air inlet pipe 5, and the other end of which is fixedly connected to a delivery pump 602. One end of the delivery pump 602 is connected to a storage container 603.

[0027] The storage container 603 is fixedly installed at the bottom of the positioning base plate 1. The delivery pump 602 is connected to the inside of the storage container 603. Through the delivery pump 602, the inert gas inside the storage container 603 can be pumped to the inner cavity of the sealing cover 4. By setting up a double-layer vacuum insulated storage container 603 (volume 500L, daily evaporation rate <0.15%), and with the PID flow control system of the delivery pump 602 (adjustment accuracy ±0.5L / min), the protective gas is dynamically supplied according to 0.8-1.2 times the theoretical gas demand, which is more energy-efficient than the traditional constant flow gas supply method.

[0028] A sealing block 10 is fixedly connected to the top of the positioning base plate 1, and the bottom of the sealing cover 4 is snapped into the inside of the sealing block 10. By setting the V-shaped dovetail groove sealing block 10 (groove depth 25mm, included angle 60°), and cooperating with the nitrile rubber sealing strip (Shore hardness 70±5) embedded at the bottom of the sealing cover 4, the installation effect of axial positioning accuracy ±0.2mm and radial freedom fully constrained is achieved, effectively preventing the sealing cover 4 from displacing under vibration conditions.

[0029] Four sets of guide posts 11 are fixedly connected to the top of the positioning base plate 1. Two sets of protrusions 12 are fixedly connected to the two side walls of the sealing cover 4 respectively. The guide posts 11 are slidably inserted into the inside of the protrusions 12. By setting the guide posts 11 and the protrusions 12 in cooperation, the sealing cover 4 is limited. By setting four hard anodized aluminum alloy guide posts 11 with a diameter of Φ50mm, and cooperating with the polytetrafluoroethylene bushings (friction coefficient ≤0.04) embedded in the protrusions 12, the verticality deviation of the sealing cover 4 during the lifting process is achieved with a precision requirement of <0.1mm / 300mm, ensuring that the concentricity error between the casting pipe 14 and the through hole 13 is controlled within ±0.5mm.

[0030] The top of the sealing cover 4 is provided with a through hole 13. The top of the upper mold 3 is fixedly connected to a casting pipe 14 that is adapted to the through hole 13. The casting pipe 14 is slidably inserted into the inside of the through hole 13. Material can be filled into the mold cavity of the upper mold 3 and the lower mold 2 through the casting pipe 14. By setting the high temperature resistant ceramic casting pipe 14 with chrome-plated inner wall (inner diameter Φ80mm, wall thickness 10mm), and cooperating with the graphite packing sealing ring (compression amount 30%) at the through hole 13, the argon leakage rate is maintained at ≤0.1L / min at a high temperature of 400℃, realizing the dual control of melt flow and gas protection during continuous casting.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for the protection against oxidation for the continuous casting of ingots of zinc alloys, comprising a positioning base plate (1), characterized in that: The top of the positioning base plate (1) is fixedly connected with a lower mold (2), the top of the lower mold (2) is provided with an upper mold (3), the top of the positioning base plate (1) is provided with a sealing cover (4), the lower mold (2) and the upper mold (3) are located in the inside of the sealing cover (4), one side of the sealing cover (4) is fixedly connected with an air inlet pipe (5), one end of the air inlet pipe (5) is connected with an inflation assembly (6) for filling inert gas into the inside of the sealing cover (4), one side of the sealing cover (4) is fixedly connected with an air outlet pipe (7), one end of the air outlet pipe (7) is connected with an air exhaust assembly (8) for exhausting air in the inside of the sealing cover (4).

2. The anti-oxidation protection device for continuous casting of zinc alloy ingot according to claim 1, characterized in that: The air exhaust assembly (8) comprises a first telescopic hose (801), one end of the first telescopic hose (801) is fixedly connected with one end of the air outlet pipe (7), and the other end of the first telescopic hose (801) is fixedly connected with a vacuum pump (802).

3. The anti-oxidation protection device for continuous casting of zinc alloy ingot according to claim 2, characterized in that: The top of the vacuum pump (802) is fixedly connected with a mounting bracket (9), and the mounting bracket (9) is fixedly installed at the bottom of the positioning base plate (1).

4. The anti-oxidation protection device for continuous casting of zinc alloy ingot according to claim 1, characterized in that: The inflation assembly (6) comprises a second telescopic hose (601), one end of the second telescopic hose (601) is fixedly connected with one end of the air inlet pipe (5), the other end of the second telescopic hose (601) is fixedly connected with a conveying pump (602), and one end of the conveying pump (602) is connected with a storage container (603).

5. The anti-oxidation protection device for continuous casting of zinc alloy ingot according to claim 4, characterized in that: The storage container (603) is fixedly installed at the bottom of the positioning base plate (1), and the conveying pump (602) is in communication with the inside of the storage container (603).

6. The anti-oxidation protection device for continuous casting of zinc alloy ingot according to claim 1, characterized in that: The top of the positioning base plate (1) is fixedly connected with a sealing block (10), and the bottom of the sealing cover (4) is clamped in the inside of the sealing block (10).

7. The anti-oxidation protection device for continuous casting of zinc alloy ingot according to claim 1, characterized in that: The top of the positioning base plate (1) is fixedly connected with four groups of guide columns (11), two groups of protruding blocks (12) are fixedly connected on the two side walls of the sealing cover (4) respectively, and the guide columns (11) are slidingly inserted into the inside of the protruding blocks (12).

8. The anti-oxidation protection device for continuous casting of zinc alloy ingot according to claim 1, characterized in that: A through hole (13) is formed in the top of the sealing cover (4), the top of the upper mold (3) is fixedly connected with a casting pipe (14) matched with the through hole (13), and the casting pipe (14) is slidingly inserted into the inside of the through hole (13).

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