Magnesium adding device for nodular cast iron pipe production

Abstract

The utility model belongs to a magnesium adding device for nodular cast iron pipe production in the technical field of metal pipe fitting production. Comprising a ladle shell (10) and a ladle cover (9), a lifting oil cylinder (1) and a high-pressure gas inlet (6) are installed on the upper portion of the ladle cover (9), the high-pressure gas inlet (6) is communicated with a high-pressure gas source, the lifting oil cylinder (1) is connected with a magnesium gun (2) located on the lower portion of the ladle cover (9), and a magnesium block (16) is clamped in a bottom cavity (19) in the lower portion of the magnesium gun (2). The magnesium adding device for nodular cast iron pipe production is simple in structure, magnesium can be better fused into molten iron under the action of pressure, sufficient inoculation and spheroidization of the magnesium and the molten iron are promoted, the absorption and utilization rate of the magnesium is improved, meanwhile, the tapping temperature of the molten iron can be reduced, raw material volatilization loss caused by too high temperature is reduced, cost is further reduced, and the production efficiency is improved. Harmful gas is reduced, and the molten iron quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal pipe production, and more specifically relates to a magnesium adding device for producing ductile iron pipes. Background Art

[0002] When producing ductile iron pipes, magnesium is usually used to inoculate molten iron for spheroidization, so that the graphite precipitated from the molten iron is spherical, thereby improving the mechanical and physical properties of the product. The commonly used magnesium spheroidization methods are wire feeding and nitrogen injection. Magnesium is an active metal that easily reacts with other elements and has strong volatility. When the molten iron is inoculated and spheroidized by the above two methods, the absorption and utilization rate of magnesium is usually not high due to the high temperature and normal pressure environment (the lower the pressure, the lower the absorption and utilization rate), resulting in a waste of costs. In addition, both the wire feeding method and nitrogen injection will increase the polluting elements in the molten iron, affecting product quality.

[0003] The prior art has a technology named "copper-magnesium smelting furnace magnesium adding device" and a publication number of "CN102353267A". The technology relates to a special tool for adding magnesium, which is mainly used for producing copper-magnesium alloy contact wires and belongs to the field of alloy smelting technology. It includes a graphite rod (1), and the head of the graphite rod (1) is arranged in an arc shape that is concave upward. The present invention provides a special tool for adding magnesium, which includes a graphite rod, and the head of the graphite rod is arranged in an arc shape that is concave upward. When adding magnesium during the smelting process, the tool head can press the magnesium ingot to the bottom of the smelting furnace like an inverted bowl. The magnesium ingot is not easy to slip during the entire pressing process, which can effectively ensure that the copper and magnesium are fully mixed, and the uniformity and accuracy of the final copper-magnesium alloy are high.

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a magnesium adding device for the production of ductile iron pipes is provided, which has a simple structure and can make magnesium better integrated into molten iron under pressure, so as to promote full incubation and spheroidization of magnesium and molten iron, and improve the absorption and utilization rate of magnesium, and at the same time can reduce the iron tapping temperature of molten iron, reduce the volatilization loss of raw materials caused by excessively high temperature, thereby reducing costs, reducing the entry of undesirable gases, and improving the quality of molten iron.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the utility model is:

[0007] The utility model discloses a magnesium adding device for producing ductile iron pipes, comprising a cladding shell and a cladding cover. A lifting oil cylinder and a high-pressure gas inlet are installed on the upper part of the cladding cover. The high-pressure gas inlet is connected to a high-pressure gas source. The lifting oil cylinder is connected to a magnesium gun located at the lower part of the cladding cover. A magnesium block is clamped in the bottom cavity of the lower part of the magnesium gun.

[0008] When the cladding is connected to the cladding cover, the magnesium block in the bottom cavity of the magnesium gun is configured to be a structure capable of extending into the molten iron in the cladding.

[0009] The bag cover is provided with a safety valve and an air release valve.

[0010] A packing liner is arranged inside the packing shell, a sealing ring is arranged outside the packing shell, and a sealing groove which can be engaged with the sealing ring is arranged at the lower part of the packing cover.

[0011] A thrust oil cylinder is arranged on the outer surface of the cladding shell, a thrust plate is installed on the end of the thrust oil cylinder, and a thrust baffle is arranged on the outer surface of the cladding cover.

[0012] The outer surface of the package shell is provided with a locking shaft, and the outer surface of the package cover is provided with a locking slot.

[0013] A pressure sensor is arranged on the high-pressure gas inlet.

[0014] A molten iron outflow valve is arranged at the bottom of the ladle cover.

[0015] The locking shafts on the outer surface of the shell are arranged in multiple gaps along the outer surface of the shell, and the locking grooves on the outer surface of the cover are arranged in multiple gaps along the outer surface of the cover, and the number and position of the locking shafts and the locking grooves correspond one to one.

[0016] The bag cover and the bag lining are both configured to have a U-shaped cross-section.

[0017] The technical solution of the utility model is adopted, and the working principle and beneficial effects are as follows:

[0018] The magnesium adding device for the production of ductile iron pipes described in the utility model is provided with a cladding and a cladding cover during the structural setting. When in use, the cladding and the cladding cover need to be connected to form a sealed cavity. The high-pressure gas inlet is connected to the high-pressure gas source for supplying high-pressure gas. The magnesium block is placed in the bottom cavity of the magnesium gun. Before the magnesium adding reaction, the lifting cylinder contracts to drive the magnesium gun to rise to the top, and the magnesium block does not contact the molten iron at this time. When the magnesium adding reaction is required, the lifting cylinder extends to drive the magnesium block into the molten iron to react with the molten iron. The innovative point of the magnesium adding device for the production of ductile iron pipes described in the utility model is that a high-pressure environment is first constructed in the closed environment formed by the cladding and the cladding cover, and then the magnesium block is added. Under the action of pressure, the magnesium can be better integrated into the molten iron, which can promote the full incubation of magnesium and molten iron into spheroidization and improve the absorption and utilization rate of magnesium. At the same time, the utility model causes the magnesium block to react in the molten iron through the action of pressure. It can lower the tapping temperature of molten iron, reduce the volatilization loss of raw materials caused by excessively high temperature, and thus reduce costs; reduce the entry of undesirable gases and improve the quality of molten iron; promote the full incubation and spheroidization of magnesium and molten iron, and improve the absorption and utilization rate of magnesium. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 This is a structural schematic diagram of a magnesium adding device for producing ductile iron pipes according to the utility model;

[0021] Figure 2 This is a structural schematic diagram of a magnesium adding device for producing ductile iron pipes according to the utility model;

[0022] The marks in the attached drawings are: 1. lifting cylinder; 2. magnesium gun; 3. lining; 4. molten iron; 5. pressure sensor; 6. high-pressure gas inlet; 7. vent valve; 8. safety valve; 9. cladding cover; 10. cladding shell; 11. thrust cylinder; 12. thrust plate; 13. thrust baffle; 14. locking shaft; 15. locking slot; 16. magnesium block; 17. sealing ring; 18. sealing slot; 19. bottom cavity. DETAILED DESCRIPTION

[0023] The following is a detailed description of the embodiments of the present invention, such as the shapes, structures, positions and connection relationships of the components involved, the functions and working principles of the components, etc., by referring to the accompanying drawings:

[0024] As attached Figure 1 , Attachment Figure 2As shown, the utility model is a magnesium adding device for ductile iron pipe production, comprising a cladding 10 and a cladding cover 9. A lifting cylinder 1 and a high-pressure gas inlet 6 are installed on the upper part of the cladding cover 9. The high-pressure gas inlet 6 is connected to a high-pressure gas source. The lifting cylinder 1 is connected to a magnesium gun 2 located at the lower part of the cladding cover 9. A magnesium block 16 is clamped in the bottom cavity 19 at the lower part of the magnesium gun 2. When the cladding 10 is connected to the cladding cover 9, the magnesium block 16 in the bottom cavity of the magnesium gun 2 is set to a structure that can extend into the molten iron in the cladding 10. The above structure proposes an improved technical solution to the deficiencies in the prior art. When the structure is set, the cladding 10 and the cladding cover 9 are set. When in use, the cladding 10 and the cladding cover 9 need to be connected to form a sealed cavity. The high-pressure gas inlet 6 is connected to a high-pressure gas source for supplying high-pressure gas. The magnesium block 16 is placed in the bottom cavity of the magnesium gun 2. Before the magnesium adding reaction, the lifting cylinder 1 contracts to drive the magnesium gun 2 to rise to the top, and at this time, the magnesium block 16 does not contact the molten iron. When magnesium addition reaction is required, the lifting cylinder 1 extends to drive the magnesium block 16 into the molten iron 4 to react with the molten iron 4. The innovation of the utility model is that by first constructing a high-pressure environment in the closed environment formed by the cladding and the cladding cover, and then adding the magnesium block, under the action of pressure, the magnesium can be better integrated into the molten iron, and the magnesium and the molten iron can be fully inoculated and spheroidized, thereby improving the absorption and utilization rate of magnesium. At the same time, the utility model makes the magnesium block react in the molten iron through pressure. It can reduce the iron tapping temperature of the molten iron, reduce the loss of raw materials caused by excessive temperature, and thus reduce costs; reduce the entry of undesirable gases, and improve the quality of the molten iron; promote the magnesium and the molten iron to fully inoculate and spheroidize, and improve the absorption and utilization rate of magnesium. The ductile iron pipe production magnesium adding device described in the utility model has a simple structure, can make magnesium better integrated into the molten iron under pressure, promote the magnesium and the molten iron to fully inoculate and spheroidize, and improve the absorption and utilization rate of magnesium, and at the same time can reduce the iron tapping temperature of the molten iron, reduce the loss of raw materials caused by excessive temperature, and thus reduce costs, reduce the entry of undesirable gases, and improve the quality of the molten iron.

[0025] The bag cover 9 is provided with a safety valve 8 and a vent valve 7. In the above structure, the safety valve 8 is provided for the following purpose: the magnesium reaction process will further increase the internal pressure, and the safety valve 8 can release the pressure to ensure safety when the pressure reaches the design pressure. The vent valve 7 is provided for the following purpose: when the magnesium reaction is completed, the electric vent valve 7 is activated to release the pressure and dust in the bag.

[0026] The lining 3 is arranged inside the cladding shell 10, the sealing ring 17 is arranged outside the cladding shell 10, and the sealing groove 18 capable of engaging with the sealing ring 17 is arranged at the lower part of the cladding cover 9. With the above structure, when the cladding shell 10 and the cladding cover 9 are connected to form a sealed cavity, the sealing ring 17 can reliably improve the sealing effect.

[0027] The outer surface of the cladding shell 10 is provided with a thrust cylinder 11, and a thrust plate 12 is installed at the end of the thrust cylinder 11. The outer surface of the cladding cover 9 is provided with a thrust baffle 13. The outer surface of the cladding shell 10 is provided with a locking shaft 14, and the outer surface of the cladding cover 9 is provided with a locking slot 15. In the above structure, when the cladding cover 9 is connected with the cladding shell 10, the cladding cover 9 is entirely covered on the cladding shell 10, 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, and the thrust plate 12 can act on the thrust baffle 13 on the cladding shell, generating a reaction force on the thrust baffle 13, and the cladding cover 9 rotates relative to the cladding shell 10; the rotation of the cladding cover 9 causes the locking shaft 14 on the cladding shell to move into the locking slot 15 on the cladding cover, and forms a contact coupling, and forms a lock after being in place, so as to realize reliable locking of the cladding shell and the cladding cover. When the cover and the shell need to be separated, the thrust cylinder 11 is controlled to contract to achieve separation.

[0028] The pressure sensor 5 is arranged on the high pressure gas inlet 6. In the above structure, the pressure sensor 5 on the cover can detect the real-time pressure. When the pressure reaches 0.5Mpa, the upgrade cylinder drives the magnesium gun to fall, thereby driving the magnesium block 16 to enter the bottom of the molten iron 4 for magnesiumization reaction.

[0029] The bottom of the cladding cover 9 is provided with a molten iron outflow valve. With the above structure, after the magnesium block and the molten iron have reacted, the cladding cover is removed from the cladding shell, and the molten iron outflow valve can be opened to release the molten iron.

[0030] The locking shafts 14 on the outer surface of the cladding shell 10 are arranged in multiple gaps along the outer surface of the cladding shell 10, and the locking slots 14 on the outer surface of the cover 9 are arranged in multiple gaps along the outer surface of the cover 9. The number and position of the locking shafts 14 and the locking slots 15 correspond to each other. In the above structure, the locking shafts 14 and the locking slots 15 are arranged correspondingly, which are used to lock the cladding shell and the cover, improve the sealing effect between the cladding shell and the cover, and ensure that the magnesium block reacts in a reliable sealed environment. The locking shaft 14 is arranged perpendicular to the side surface of the cover. After the locking shaft 14 is inserted into the locking slot 15, the cover and the cladding shell are limited in the up and down directions, so that the two will not separate when the internal pressure increases.

[0031] The cladding cover 9 and the cladding liner 3 are both configured to have a U-shaped cross-section. In the above structure, the cladding cover is a cylindrical structure with an opening at one end, and the cladding shell is a cylindrical structure with an opening at one end. When the cladding cover and the cladding shell are connected, a closed sealed cavity is formed, which facilitates reliable reaction of the molten iron and magnesium blocks in the cladding shell.

[0032] The working process of the device of the utility model is as follows: the magnesium block 16 is placed in the bottom cavity of the magnesium gun 2, and the lifting cylinder 1 first drives the magnesium gun 2 to rise to the top. The cover 9 is covered on the cladding shell 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 the thrust plate 12 pushes the thrust baffle 13 on the cladding shell, generating a reaction force on the thrust baffle 13, and driving the cover to rotate relative to the cladding shell 10; the cover 9 rotates, driving the locking shaft 14 on the cladding shell 10 to rotate into the locking slot 15 on the cover, and forming a contact coupling, and locking is formed after it is in place, and the high-pressure gas enters the sealed cavity from the high-pressure gas inlet 6 on the cover 9, and the high-temperature resistant sealing ring 17 located between the mounting surfaces of the cladding shell 10 and the cover 9 blocks the high-pressure gas, ensuring that a high-pressure environment is formed in the sealed cavity. The pressure sensor 5 on the ladle cover can detect the real-time pressure in the sealed cavity. When the pressure reaches 0.5Mpa, the upgrade cylinder 1 drives the magnesium gun 2 to fall, 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 relieve 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. The thrust cylinder 11 drives in reverse, the ladle cover 9 rotates in the opposite direction, and the locking shaft leaves the locking position and aligns with the outlet position. The ladle cover is lifted away as a whole, and the molten iron completes magnesium and enters the iron-discharging process.

[0033] The magnesium adding device for the production of ductile iron pipes described in the utility model is provided with a cladding 10 and a cladding cover 9. When in use, the cladding 10 and the cladding cover 9 need to be connected to form a sealed cavity. The high-pressure gas inlet 6 is connected to the high-pressure gas source for supplying high-pressure gas. The magnesium block 16 is placed in the bottom cavity of the magnesium gun 2. Before the magnesium adding reaction, the lifting cylinder 1 contracts to drive the magnesium gun 2 to rise to the top, and at this time the magnesium block 16 does not contact the molten iron. When the magnesium adding reaction is required, the lifting cylinder 1 extends to drive the magnesium block 16 into the molten iron 4 to react with the molten iron 4. The innovation of the utility model is that by first constructing a high-pressure environment in the closed environment formed by the cladding and the cladding cover, and then adding the magnesium block, under the action of pressure, the magnesium can be better integrated into the molten iron, which can promote the full incubation of magnesium and molten iron into spheroidization and improve the absorption and utilization rate of magnesium. At the same time, the utility model causes the magnesium block to react in the molten iron through pressure. It can lower the tapping temperature of molten iron, reduce the volatilization loss of raw materials caused by excessively high temperature, and thus reduce costs; reduce the entry of undesirable gases and improve the quality of molten iron; promote the full incubation and spheroidization of magnesium and molten iron, and improve the absorption and utilization rate of magnesium.

[0034] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A magnesium adding device for producing ductile iron pipes, characterized in that: The invention comprises a cladding shell (10) and a cladding cover (9). A lifting cylinder (1) and a high-pressure gas inlet (6) are installed on the upper part of the cladding cover (9). The high-pressure gas inlet (6) is connected to a high-pressure gas source. The lifting cylinder (1) is connected to a magnesium gun (2) located at the lower part of the cladding cover (9). A magnesium block (16) is clamped in a bottom cavity (19) at the lower part of the magnesium gun (2).

2. The magnesium adding device for producing ductile iron pipe according to claim 1, characterized in that: When the cladding (10) is connected to the cladding cover (9), the magnesium block (16) in the bottom cavity of the magnesium gun (2) is configured to have a structure capable of extending into the molten iron in the cladding (10).

3. The magnesium adding device for producing ductile iron pipe according to claim 1 or 2, characterized in that: The bag cover (9) is provided with a safety valve (8) and an air release valve (7).

4. The magnesium adding device for producing ductile iron pipe according to claim 1 or 2, characterized in that: A lining (3) is arranged inside the cladding shell (10), a sealing ring (17) is arranged outside the cladding shell (10), and a sealing groove (18) capable of being engaged with the sealing ring (17) is arranged at the lower part of the cladding cover (9).

5. The magnesium adding device for producing ductile iron pipe according to claim 4, characterized in that: A thrust cylinder (11) is arranged on the outer surface of the cladding shell (10), a thrust plate (12) is installed at the end of the thrust cylinder (11), and a thrust baffle (13) is arranged on the outer surface of the cladding cover (9).

6. The magnesium adding device for producing ductile iron pipe according to claim 5, characterized in that: A locking shaft (14) is arranged on the outer surface of the cladding shell (10), and a locking slot (15) is arranged on the outer surface of the cladding cover (9).

7. The magnesium adding device for producing ductile iron pipe according to claim 1 or 2, characterized in that: A pressure sensor (5) is provided on the high-pressure gas inlet (6).

8. The magnesium adding device for producing ductile iron pipe according to claim 1 or 2, characterized in that: A molten iron outflow valve is arranged at the bottom of the ladle cover (9).

9. The magnesium adding device for producing ductile iron pipe according to claim 6, characterized in that: A plurality of locking shafts (14) on the outer surface of the cladding shell (10) are arranged at intervals along the outer surface of the cladding shell (10), and a plurality of locking grooves (15) on the outer surface of the cladding cover (9) are arranged at intervals along the outer surface of the cladding cover (9), and the number and position of the locking shafts (14) and the locking grooves (15) correspond one to one.

10. The magnesium adding device for producing ductile iron pipe according to claim 1 or 2, characterized in that: The bag cover (9) and the bag lining (3) are both configured to have a U-shaped cross-section.

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