High-pressure dust-free molten iron spheroidizing device

Abstract

The molten iron high-pressure dust-free spheroidizing device comprises a ladle body, a ladle cover, a magnesium gun and a lifting oil cylinder, a cavity for containing molten iron is formed in the ladle body, the ladle cover covers the ladle body, the magnesium gun is vertically arranged and penetrates through the ladle cover to extend into the ladle body, and the lifting oil cylinder is installed at the top of the magnesium gun and is arranged to be capable of driving the magnesium gun to ascend or descend. A cavity formed in the bottom of the magnesium gun and used for containing a magnesium block ascends or is immersed in the molten iron; the ladle cover and the ladle body are connected in a sealed mode through a locking assembly, a sealed environment is formed in the ladle body, a high-pressure gas inlet is formed in the ladle cover and used for filling high-pressure gas into the ladle body, the pressure sensor is used for sensing the gas pressure in the ladle body and closing the gas inlet valve, and the safety valve is used for relieving pressure when the pressure is ultrahigh. And the electric deflation valve is used for releasing pressure and dust in the bag body. The molten iron quality can be improved, the absorption and utilization rate of magnesium in the molten iron spheroidizing process is increased, the cost is reduced, and meanwhile zero-dust emission is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ductile iron pipe production, and in particular to a molten iron high-pressure dust-free spheroidizing device. Background Art

[0002] For a long time, when producing ductile iron pipes, metallic magnesium is usually used to perform spheroidization treatment on molten iron, so that the graphite precipitated from the molten iron is spherical, thereby improving the mechanical and physical properties of the product.

[0003] At present, the commonly used magnesium spheroidization methods are wire feeding method and nitrogen blowing method. Magnesium is an active metal, which is easy to react with other elements and has strong volatility. When the molten iron is inoculated and spheroidized by the above two methods, due to being in a high temperature and normal pressure environment, the absorption and utilization rate of magnesium is usually not high (the lower the pressure, the lower the absorption and utilization rate), which will cause a waste of cost. In addition, both the wire feeding method and the nitrogen blowing method will increase the polluting elements in the molten iron, affecting the product quality. It can be seen that there are two core shortcomings of the prior art, one is the low absorption rate of magnesium, and the other is that the anti-spheroidization process will be accompanied by a large amount of smoke and dust overflow. Summary of the invention

[0004] The purpose of the present invention is to provide a molten iron high-pressure dust-free spheroidizing device, which can improve the quality of molten iron, increase the absorption and utilization rate of magnesium in the molten iron spheroidizing process, and achieve zero dust emission while reducing costs.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a molten iron high-pressure dust-free spheroidizing device, which comprises a ladle, a ladle cover, a magnesium gun and a lifting cylinder, wherein a cavity for accommodating molten iron is formed inside the ladle, the ladle cover is arranged on the ladle, the magnesium gun is vertically arranged and extends into the ladle through the ladle cover, the lifting cylinder is installed on the top of the magnesium gun, and is arranged to be able to drive the magnesium gun to rise or fall, so that the cavity for accommodating magnesium blocks formed at the bottom of the magnesium gun rises or immerses in the molten iron; wherein,

[0006] The bag cover and the bag body are sealed and connected by a locking assembly to form a sealed environment inside the bag body. The bag cover is provided with a high-pressure gas inlet, a pressure sensor, a safety valve and an electric air release valve. The high-pressure gas inlet is used to fill the bag body with high-pressure gas, the pressure sensor is used to sense the air pressure inside the bag body and close the air inlet valve, the safety valve is used to release the pressure when the pressure is too high, and the electric air release valve is used to release the pressure and dust inside the bag.

[0007] Preferably, a high temperature resistant sealing ring is provided between the sealing mounting surfaces of the package body and the package cover.

[0008] Preferably, the locking assembly includes a locking slot arranged on the package cover and a locking shaft arranged on the package body, and the locking slot is arranged to be able to align with the locking shaft and form a contact coupling when the package cover is covered on the package body, and can form locking when in place.

[0009] Preferably, the locking assembly further comprises a thrust plate arranged on the package cover and a thrust baffle plate arranged on the package body, a clamping groove is formed on the thrust plate, and the clamping groove is clamped on the thrust baffle plate.

[0010] Preferably, a thrust cylinder is provided on the thrust plate, and the thrust cylinder is configured to be able to drive the thrust plate to extend by extending, so that the slot of the thrust plate pushes the thrust baffle to generate a reaction force, thereby causing the bag cover to rotate relative to the bag body.

[0011] Preferably, the pressure sensor is configured to activate the lifting cylinder to drive the magnesium gun to descend so as to immerse the magnesium block into the bottom of the molten iron when the pressure reaches 0.5 MPa.

[0012] Preferably, a refractory lining is formed on the inner wall of the encasement.

[0013] Preferably, a plurality of reinforcing ribs are provided at the connection between the lifting cylinder and the cover, and the plurality of reinforcing ribs are evenly arranged along the circumferential direction.

[0014] Preferably, the lifting cylinder, the magnesium gun, the bag cover and the bag body are coaxially arranged.

[0015] Preferably, the high-pressure gas inlet, the safety valve and the electric air release valve are evenly distributed around the lifting cylinder.

[0016] According to the above technical scheme, the present invention utilizes the spheroidization reaction of magnesium under high pressure environment to be more sufficient, and the absorption rate is doubled. In addition, the construction of pressure space requires the establishment of a sealed environment, which also means that smoke and dust cannot overflow during the reaction process. After the reaction, it can be directly discharged into the dust collector through a sealed pipeline to achieve dust removal sealing. The whole system has no open ports and achieves zero overflow. Accordingly, by first constructing a high-pressure environment in a closed environment and then adding magnesium blocks, magnesium can be better integrated into the molten iron under pressure to achieve the purpose of incubating spheroidization.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic structural diagram of a molten iron high-pressure dust-free spheroidizing device according to an embodiment of the present invention;

[0020] Figure 2 It is a cross-sectional view of a molten iron high-pressure dust-free spheroidizing device according to an embodiment of the present invention.

[0021] Description of Reference Numerals

[0022] 1-Lifting Cylinder 2-Magnesium Gun

[0023] 3-Refractory lining 4-Molten iron

[0024] 5-pressure sensor 6-high pressure gas inlet

[0025] 7-Electric air release valve 8-Safety valve

[0026] 9-package cover 10-package body

[0027] 11-Thrust cylinder 12-Thrust plate

[0028] 13-Thrust baffle 14-Locking shaft

[0029] 15-locking slot 16-magnesium block

[0030] 17-High temperature resistant sealing ring DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0032] In the present invention, unless otherwise stated, directional words such as "up, down, top, bottom, inside, outside" contained in the terms merely represent the orientation of the terms in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the terms.

[0033] See also Figure 1 and Figure 2 The present invention provides a high-pressure dust-free spheroidizing device for molten iron, which includes a ladle 10, a ladle cover 9, a magnesium gun 2 and a lifting cylinder 1. A cavity for accommodating molten iron 4 is formed inside the ladle 1, the ladle cover 9 is covered on the ladle 10, the magnesium gun 2 is vertically arranged and extends into the ladle 10 through the ladle cover 9, and the lifting cylinder 1 is installed on the top of the magnesium gun 2 and is arranged to be able to drive the magnesium gun 2 to rise or fall, so that the cavity for accommodating magnesium blocks 16 formed at the bottom of the magnesium gun 2 rises or immerses in the molten iron 4; wherein,

[0034] The package cover 9 is sealed and connected to the package body 10 through a locking assembly to form a sealed environment inside the package body 10. The package cover 9 is provided with a high-pressure gas inlet 6, a pressure sensor 5, a safety valve 8 and an electric air release valve 7. The high-pressure gas inlet 6 is used to fill the package body 10 with high-pressure gas, the pressure sensor 5 is used to sense the air pressure inside the package body 10 and close the air inlet valve, the safety valve 8 is used to release the pressure when the pressure is too high, and the electric air release valve 7 is used to release the pressure and dust inside the package.

[0035] Through the above technical solution, the spheroidization reaction of magnesium in a high-pressure environment is more sufficient, and the absorption rate is doubled. In addition, the construction of a pressure space requires the establishment of a sealed environment, which also means that smoke and dust cannot overflow during the reaction process. After the reaction, it can be directly discharged into the dust collector through a sealed pipeline to achieve dust removal sealing. There is no open port in the entire system, and zero overflow is achieved. Accordingly, by first constructing a high-pressure environment in a closed environment and then adding magnesium blocks, magnesium can be better integrated into the molten iron under pressure to achieve the purpose of incubating spheroidization.

[0036] In this embodiment, in order to obtain a better sealing effect, preferably, a high temperature resistant sealing ring 17 is provided between the sealing mounting surface of the package body 10 and the package cover 9. In this way, the high pressure gas enters the package body 10 from the high pressure gas inlet 6 on the package cover 9, and the high temperature resistant sealing ring 17 located between the package body 10 and the mounting surface of the package cover 9 can block the high pressure gas, forming a high pressure environment in the package.

[0037] The locking assembly can be any common connection structure in the art that can tightly seal the two. However, from the perspective of easy operation and simplified structure, the locking assembly preferably includes a locking slot 15 provided on the package cover 9 and a locking shaft 14 provided on the package body 10. The locking slot 15 is arranged to be aligned with the locking shaft 14 and form a contact coupling when the package cover 9 is covered on the package body 10, and can be locked after being in place. With this structure, the package cover 9 and the package body 10 can be tightly combined by relatively rotating the package cover 9 and the package body 10.

[0038] Furthermore, in order to apply a restraining force from the outside to ensure the tightness of the connection between the package cover 9 and the package body 10, preferably, the locking assembly further includes a thrust plate 12 provided on the package cover 9 and a thrust baffle 13 provided on the package body 10, and a clamping groove is formed on the thrust plate 12, and the clamping groove is clamped on the thrust baffle 13. In this way, when the package cover 9 and the package body 10 are relatively rotated, the clamping between the thrust plate 12 and the thrust baffle 13 can further improve the sealing of the connection between the package cover 9 and the package body 10.

[0039] Furthermore, in order to achieve mechanical control of the relative rotation of the package cover 9 and the package body 10 and save the physical effort consumed by manual rotation, a thrust cylinder 11 is preferably provided on the thrust plate 12, and the thrust cylinder 11 is configured to be able to drive the thrust plate 12 to extend by extending, so that the slot of the thrust plate 12 pushes the thrust baffle 13 to generate a reaction force, thereby causing the package cover 9 to rotate relative to the package body 10.

[0040] In addition, in order to accurately control the timing of adding magnesium, the pressure sensor 5 is preferably configured to activate the lifting cylinder 1 to drive the magnesium gun 2 to descend when the pressure reaches 0.5 MPa to immerse the magnesium block 16 into the bottom of the molten iron 4.

[0041] In this embodiment, preferably, a layer of refractory lining 3 is formed on the inner wall of the encasement.

[0042] In addition, in order to improve the stability of the core components of the molten iron high-pressure dust-free spheroidizing device after connection and extend the service life of the entire device, preferably, a plurality of reinforcing ribs are provided at the connection between the lifting cylinder 1 and the cover 9, and the plurality of reinforcing ribs are evenly arranged along the circumferential direction.

[0043] When operating the molten iron high-pressure dust-free spheroidizing device, in order to ensure its stability and avoid easy tipping due to external force after the center of gravity shifts, resulting in waste of raw materials or even production accidents, it is preferred to set the lifting cylinder 1, magnesium gun 2, ladle cover 9, and ladle body 10 coaxially.

[0044] In order to provide a sufficiently large operating space to facilitate manual opening of the high-pressure gas inlet 6, the safety valve 8 or the electric air release valve 7 and prevent operating inconveniences from affecting work efficiency, preferably, the high-pressure gas inlet 6, the safety valve 8 and the electric air release valve 7 are evenly distributed around the lifting cylinder 1.

[0045] In actual operation, the magnesium block 16 is placed in the bottom cavity of the magnesium gun 2, and the lifting cylinder 1 drives the magnesium gun 2 to rise to the top. The package cover 9 is covered on the package body 10 as a whole, and the opening of the locking slot 15 is aligned with the locking shaft 14. The slot of the thrust plate 12 is stuck on the thrust baffle 13, and the thrust cylinder 11 extends to drive the thrust plate 12 installed on the head to extend and move. The slot of the thrust plate 12 pushes the thrust baffle 13 on the package body to generate a reaction force, causing the package cover 9 to rotate relative to the package body 10. When the package cover 9 rotates, the locking shaft 14 on the package body 10 rotates into the locking slot 15 on the package cover 9, and forms a contact coupling, and is locked after it is in place. High-pressure gas enters the package body from the high-pressure gas inlet 6 on the package cover 9, and the high-temperature resistant sealing ring 17 located between the package body 10 and the mounting surface of the package cover 9 blocks the high-pressure gas, forming a high-pressure environment in the package. The pressure sensor 5 on the ladle cover 9 can detect the real-time pressure. When the pressure reaches 0.5Mpa, the lifting cylinder 1 drives the magnesium gun 2 to fall, thereby driving the magnesium block 16 to enter the bottom of the molten iron 4 for a magnesium reaction. The magnesium reaction process will further increase the internal pressure. The safety valve 8 can release the pressure when the pressure reaches the design pressure to ensure safety. When the magnesium reaction is completed, the electric vent valve 7 is started to release the pressure and dust in the ladle. When the magnesium reaction is completed, the thrust cylinder 11 is driven in reverse, the ladle cover 9 rotates in the opposite direction, and the locking shaft 14 leaves the locking position and aligns with the outlet position. At this time, the ladle cover 9 is lifted away as a whole, the molten iron has completed magnesiumization, and the iron-discharging process can be entered.

[0046] It can be seen that the present invention uses pressure to make the magnesium block react in the molten iron, which can reduce the temperature of the molten iron, reduce the loss of raw materials caused by excessive temperature, and thus reduce costs. At the same time, it can reduce the entry of undesirable gases and improve the quality of molten iron. It promotes the full incubation and spheroidization of magnesium and molten iron, and improves the absorption and utilization rate of magnesium. In addition, because the reaction is sufficient, the amount of smoke generated is greatly reduced, the intensity is greatly reduced, and a fully sealed system is formed. During the reaction process, the smoke cannot overflow and can be directly discharged into the dust collector through a sealed pipeline after the reaction, achieving zero dust emission.

[0047] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0049] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A molten iron high-pressure dust-free spheroidizing device, characterized in that: The molten iron high-pressure dust-free spheroidizing device comprises a ladle (10), a ladle cover (9), a magnesium gun (2) and a lifting cylinder (1); a cavity for accommodating molten iron (4) is formed inside the ladle (1); the ladle cover (9) is arranged on the ladle (10); the magnesium gun (2) is arranged vertically and passes through the ladle cover (9) to extend into the ladle (10); the lifting cylinder (1) is installed on the top of the magnesium gun (2) and is arranged to be able to drive the magnesium gun (2) to rise or fall, so that the cavity for accommodating the magnesium block (16) formed at the bottom of the magnesium gun (2) rises or immerses in the molten iron (4); wherein, The package cover (9) and the package body (10) are sealed and connected via a locking assembly to form a sealed environment in the package body (10). The package cover (9) is provided with a high-pressure gas inlet (6), a pressure sensor (5), a safety valve (8) and an electric air release valve (7). The high-pressure gas inlet (6) is used to fill the package body (10) with high-pressure gas. The pressure sensor (5) is used to sense the air pressure in the package body (10) and close the air inlet valve. The safety valve (8) is used to release pressure when the pressure is too high. The electric air release valve (7) is used to release the pressure and dust in the package.

2. The molten iron high-pressure dust-free spheroidizing device according to claim 1, characterized in that: A high temperature resistant sealing ring (17) is provided between the sealing mounting surfaces of the package body (10) and the package cover (9).

3. The molten iron high pressure dust-free spheroidizing device according to claim 1, characterized in that: The locking assembly comprises a locking slot (15) arranged on the package cover (9) and a locking shaft (14) arranged on the package body (10); the locking slot (15) is arranged so as to be aligned with the locking shaft (14) and form a contact coupling when the package cover (9) is covered on the package body (10), and locking can be formed when in place.

4. The molten iron high-pressure dust-free spheroidizing device according to claim 3, characterized in that: The locking assembly further comprises a thrust plate (12) arranged on the package cover (9) and a thrust baffle plate (13) arranged on the package body (10); a clamping groove is formed on the thrust plate (12), and the clamping groove is clamped on the thrust baffle plate (13).

5. The molten iron high-pressure dust-free spheroidizing device according to claim 4, characterized in that: The thrust plate (12) is provided with a thrust cylinder (11), and the thrust cylinder (11) is configured to be able to drive the thrust plate (12) to extend by extending, so that the slot of the thrust plate (12) pushes the thrust baffle (13) to generate a reaction force, thereby causing the bag cover (9) to rotate relative to the bag body (10).

6. The molten iron high pressure dust-free spheroidizing device according to claim 1, characterized in that: The pressure sensor (5) is configured to activate the lifting cylinder (1) to drive the magnesium gun (2) to descend so as to immerse the magnesium block (16) into the bottom of the molten iron (4) when the pressure reaches 0.5 MPa.

7. The molten iron high pressure dust-free spheroidizing device according to claim 1, characterized in that: A layer of refractory lining (3) is formed on the inner wall of the encasement (10).

8. The molten iron high pressure dust-free spheroidizing device according to claim 1, characterized in that: A plurality of reinforcing ribs are provided at the connection between the lifting cylinder (1) and the cover (9), and the plurality of reinforcing ribs are evenly arranged along the circumferential direction.

9. The molten iron high pressure dust-free spheroidizing device according to claim 1, characterized in that: The lifting cylinder (1), the magnesium gun (2), the bag cover (9), and the bag body (10) are coaxially arranged.

10. The molten iron high pressure dust-free spheroidizing device according to claim 1, characterized in that: The high-pressure gas inlet (6), the safety valve (8) and the electric air release valve (7) are evenly distributed around the lifting cylinder (1).

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