CN212042578U - 1Cr17Ni2 or 5CrNiMoV molten steel casting system with movable airtight cover - Google Patents

Abstract

The utility model belongs to the technical field of metallurgical casting, and relates to a movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system with an airtight cover; the utility model comprises a ingot casting unit, an airtight cover and a moving unit, wherein the ingot casting unit comprises a middle injection pipe and an ingot mold, and the airtight cover is movably arranged above the middle injection pipe and the ingot mold through the moving unit; the moving unit comprises a first rotating shaft, the airtight cover is arranged on the first rotating shaft, and the first rotating shaft drives the airtight cover to move back and forth above the middle injection pipe and the ingot mould; the utility model drives the airtight cover to move back and forth above the central pouring pipe and the ingot mould through the moving unit, so that the airtight cover can be conveniently moved above the central pouring pipe or the ingot mould at different stages of molten steel casting; the building cost is low, the use convenience is high, and the production efficiency is effectively improved.

Description

1Cr17Ni2 or 5CrNiMoV molten steel casting system with movable airtight cover

Technical Field

The utility model belongs to the technical field of the metallurgical casting, more specifically say, relate to a portable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of airtight cover.

Background

The 1Cr17Ni2 series is a steel type of martensitic stainless steel with better matching of strength and toughness. It has good corrosion resistance to aqueous solutions of oxidizing acids, most organic acids and organic salts. The alloy is generally applicable to parts such as shafts, piston rods, pumps and the like which require obdurability and corrosion resistance in the production of nitric acid and acetic acid and the industries of light industry, textile and the like. The 5CrNiMoV is high-wear-resistance hot forging die steel and has the following component design characteristics: good toughness, high strength and good wear resistance; the die steel produced by adopting an Electric Arc Furnace (EAF), refining (LT) and Vacuum (VD) has high purity and good performance.

The steel grades have excellent performances and are widely applied in specific fields, but the steel grades have higher requirements on inclusions in the actual production process, and particularly, oxygen in the air easily enters molten steel in the casting process at present, so that inclusions appear in casting blanks and the performance of steel is influenced; therefore, it is required to insulate the molten steel using an insulation apparatus during the casting of the molten steel.

At present, the above-mentioned steel is cast by combining a central pouring pipe and an ingot mold, for example, in a device disclosed in "a method for improving cooling conditions of a steel ingot" (publication No. CN107790651A), molten steel is poured into the ingot mold through the central pouring pipe to be cast. However, since the pouring position needs to be changed during the pouring of molten steel and the insulation from air during the pouring of molten steel needs to be ensured, if the insulation devices are arranged on the intermediate pouring pipe and the ingot mold, not only the construction cost is increased, but also the subsequent process operation is very inconvenient, and if the replacement is carried out back and forth, the time cost is increased, so that the problem needs to be solved urgently.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

Aiming at the problem that the isolation device of the injection pipe and the ingot mould is difficult to arrange in the casting process of the existing equipment, the movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of the airtight cover is provided, and the airtight cover can move between the injection pipe and the ingot mould through the arrangement of the moving unit, so that the convenience is improved under the condition of ensuring the isolation of the molten steel.

2. Technical scheme

In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:

the utility model discloses a movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system with an airtight cover, which comprises a cast ingot unit, the airtight cover and a movable unit; the ingot casting unit comprises a middle injection pipe and an ingot mold, and the airtight cover is arranged above the middle injection pipe and the ingot mold in a reciprocating manner through the moving unit; the airtight cover comprises a cover body shell and a second rotating shaft, the cover body shell consists of 2 half shells, the second rotating shaft is arranged at the joint of the half shells, and the half shells are rotatably connected through the second rotating shaft; the mobile unit comprises a first rotating shaft and a lifter, and the airtight cover is arranged on the first rotating shaft through the lifter.

Preferably, the cover body shell is provided with a water gap accommodating hole, a casting accommodating hole and an injection pipe, the water gap accommodating hole is formed in the top of the cover body shell, the casting accommodating hole is formed in the bottom of the cover body shell, and the injection pipe is connected with an air source through a vent pipe.

Preferably, the bottom of the middle injection pipe is communicated with the bottom of the ingot mold through a drainage pipe, and the lower part of the outer wall of the ingot mold is provided with a water cooling pipe.

Preferably, the inner side wall of the cover body shell is provided with paraffin, and the paraffin is uniformly arranged on the inner side wall of the cover body shell along the circumferential direction.

Preferably, the height of the tundish and the ingot mould is the same.

Preferably, the height of the transverse section of the ingot mould from the bottom of the ingot mould is H, the area of the transverse section of the ingot mould being a continuously increasing function of H.

Preferably, the middle injection pipe is sequentially provided with a high-temperature resistant layer and a heat insulation layer from inside to outside.

Preferably, refractory wool is provided around the nozzle receiving bore.

Preferably, the injection pipe comprises an upper injection pipe and a lower injection pipe, the injection direction of the upper injection pipe is inclined upwards, the injection direction of the lower injection pipe is inclined downwards, the upper injection pipe is connected with the air source through an upper vent pipe, and the lower injection pipe is connected with the air source through a lower vent pipe.

Preferably, the water cooling pipe is provided with a water inlet and a water outlet, the height from the ground of the water inlet is D1, the height from the ground of the water outlet is D2, the distance from the ground of the highest position of the ingot mould is D3, D1 is less than D2, and D2: D3 is 1/4-1/3.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of an airtight cover, the airtight cover is movably arranged above a ingot casting unit through a first rotating shaft on a moving unit; the moving unit drives the airtight cover to move back and forth above the central pouring pipe and the ingot mold, so that the airtight cover can be conveniently moved above the central pouring pipe or the ingot mold at different stages of molten steel casting; the building cost is low, the use convenience is high, and the production efficiency is effectively improved.

(2) The utility model discloses a movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of an airtight cover, wherein a cover body shell of the airtight cover consists of 2 half shells and rotates relatively through a second rotating shaft of a moving unit; the design can lead the airtight cover to be matched with the middle injection pipe and the ingot mould, thus improving the air tightness of the airtight cover.

(3) The utility model discloses a portable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of airtight cover, the area of ingot mould upper portion cross section is greater than the area of lower part cross section, the installation of the airtight cover of being convenient for, and the ingot mould drops when preventing to use, improves the device security.

(4) The utility model discloses a portable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of airtight cover, cover body shell's inside lateral wall evenly is provided with the paraffin layer along the circumferencial direction, and at the initial stage of casting process, molten steel radiant heat makes the paraffin burning, and then paraffin will cover body shell internal residual oxygen consumption, avoids oxygen to get into the molten steel to the realization is to the protection of molten steel.

(5) The utility model discloses a portable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of airtight cover, cover body shell's top is provided with refractory cotton along mouth of a river accommodation hole around, can prevent to cause equipment to damage when high temperature molten steel sputters to the accommodation hole.

Drawings

FIG. 1 is a top view of the opened state of the half shell in the movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of the present invention;

FIG. 2 is a top view of the movable airtight cover of the present invention, in which the airtight cover is located on the middle pouring pipe in the 1Cr17Ni2 or 5CrNiMoV molten steel casting system;

FIG. 3 is a top view showing the moving state of the airtight cover in the movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system;

FIG. 4 is a side view of the movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system with the airtight cover;

FIG. 5 is a front view of the movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system with the airtight cover;

FIG. 6 is a schematic view of the device of the present invention, in which the airtight cover is movable, for the airtight cover in the 1Cr17Ni2 or 5CrNiMoV molten steel casting system;

FIG. 7 is a schematic view showing the use state of the airtight cover in the movable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of the present invention;

FIG. 8 is a schematic structural view of an ingot casting device in the 1Cr17Ni2 or 5CrNiMoV molten steel casting system with a movable airtight cover according to the present invention in the embodiment 1;

FIG. 9 is a schematic structural view of an ingot casting device in the 1Cr17Ni2 or 5CrNiMoV molten steel casting system with a movable airtight cover according to the embodiment of the present invention.

The reference numbers in the figures illustrate:

100. a middle injection pipe; 110. a thermal insulation layer; 120. a high temperature resistant layer; 130. a molten steel outlet; 200. an ingot mold; 210. a molten steel inlet; 300. a drainage tube; 400. a water-cooled tube; 410. a water inlet; 411. a water inlet flange; 420. a water outlet; 421. a water outlet flange; 500. molten steel;

600. a cover body housing; 601. a nozzle receiving hole; 602. casting the accommodating hole; 603. a half-shell; 610. refractory cotton; 620. the bottom of the cover body;

710. an upper blowing pipe; 711. an upper vent pipe; 720. a lower blowing pipe; 721. a lower vent pipe;

801. a ladle; 802. casting a water gap; 803. a ingot casting device; 810. a fixing member; 820. paraffin wax;

901. a first rotating shaft; 902. a lifter; 903. a second rotating shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

The utility model discloses a portable 1Cr17Ni2 or 5CrNiMoV molten steel casting system of airtight cover, as shown in FIG. 1, including ingot casting unit, airtight cover and mobile unit, the ingot casting unit includes well notes pipe 100 and ingot mould 200, and airtight cover sets up in the top of well notes pipe 100 and ingot mould 200 through mobile unit round trip movement ground.

The moving unit comprises a first rotating shaft 901, the airtight cover is arranged on the first rotating shaft 901, the first rotating shaft 901 is driven by a motor to rotate, as shown in fig. 2, the first rotating shaft 901 drives the airtight cover to move back and forth above the central pouring pipe 100 and above the ingot mold 200, when molten steel needs to be switched from the central pouring pipe 100 to the ingot mold 200 for casting, as shown in fig. 3, the motor drives the first rotating shaft 901 to rotate, and the first rotating shaft 901 drives the airtight cover to move from the upper part of the central pouring pipe 100 to the upper part of the ingot mold 200 for isolation.

As shown in fig. 3, the moving unit further includes a lifter 902, the lifter 902 is disposed on the first rotating shaft 901 in a manner of moving up and down, in this embodiment, the lifter 902 includes a gear driven by a motor, a driving gear matched with the gear is disposed on the first rotating shaft 901, and when the driving gear is matched with the gear, the motor drives the gear to rotate, so that the lifter 902 can be lifted on the first rotating shaft 901. The airtight cover is provided on the lifter 902, and the height of the airtight cover can be adjusted by the lifter 902.

The airtight enclosure of the present embodiment, as shown in fig. 6-7, includes an enclosure 600, the enclosure 600 is composed of 2 half enclosures 603, a second rotating shaft 903 is disposed at a joint of the 2 half enclosures 603, the half enclosures 603 are connected to the moving unit through the second rotating shaft 903, and the half enclosures 603 rotate relatively through the second rotating shaft 903 of the moving unit. As shown in fig. 4 and 5, this arrangement allows the cover body case 600 to wrap the top of the ingot mold 200 and the tundish 100 having a large steel inlet, thereby achieving effective separation of molten steel. The top of the cover body shell 600 is provided with a nozzle accommodating hole 601, refractory wool 610 is arranged around the nozzle accommodating hole 601, and the refractory wool 610 contacts the bottom of the ladle 801 in the casting process, so that the insulating effect can be achieved to a certain extent. The cover bottom 620 of the cover housing 600 is provided with a casting accommodation hole 602; during casting, as shown in the use state diagram of fig. 2, the casting nozzle 802 of the ladle 801 is inserted into the nozzle accommodating hole 601 from the top of the cover body housing 600, so that the casting accommodating hole 602 of the cover body bottom 620 surrounds the molten steel inlet of the ingot casting device 803, and the molten steel in the ladle 801 flows into the molten steel inlet of the ingot casting device 803 from the casting nozzle 802 through the interior of the cover body housing 600.

In this embodiment, the two half shells 603 of the cover body shell 600 are separately arranged, and during casting, the two separate half shells 603 are combined to surround the casting nozzle 802 of the ladle 801 and the molten steel inlet of the tundish 100 or the ingot mold 200, and then the lifting component drives the cover body shell 600 to move upwards, so that the refractory wool 610 at the top of the cover body shell 600 contacts the bottom of the ladle 801, and then the molten steel can be released.

In order to ensure the air seal effect, an upper blowing pipe 710 and a lower blowing pipe 720 are arranged in the cover body casing 600, the blowing direction of the upper blowing pipe 710 is inclined upwards, the blowing direction of the lower blowing pipe 720 is inclined downwards, the upper blowing pipe 710 is connected with an air source through an upper vent pipe 711, and the lower blowing pipe 720 is connected with the air source through a lower vent pipe 721. In the casting process, the obliquely arranged upper injection pipe 710 obliquely and upwardly injects argon gas, and the obliquely and upwardly injects argon gas to seal the gap between the top of the cover body shell 600 and the casting nozzle 802; the lower blowing pipe 720 which is arranged obliquely blows argon gas obliquely downwards, and the argon gas obliquely downwards blows the argon gas to seal the gap between the bottom 620 of the cover body and the ingot casting device 803. In this embodiment, the angle of inclination of the upper blowing pipe 710 to the horizontal plane is 30 to 60 °, and the angle of inclination of the lower blowing pipe 720 to the horizontal plane is 30 to 60 °.

In addition, a plurality of upper blowing pipes 710 and a plurality of lower blowing pipes 720 are provided, and the upper blowing pipes 710 are uniformly arranged along the circumferential direction inside the cover body case 600; so as to ensure the uniformity of argon blowing of the blowing pipe and the uniformity of the air seal effect. And the upper blowing pipe 710 and the lower blowing pipe 720 are at least provided with two layers in the height direction, and the arrangement of the multiple layers of blowing pipes can improve the air seal area, thereby further improving the air seal effect of the blowing pipes for blowing argon.

It should be noted that the paraffin 820 is disposed on the inner sidewall of the cover housing 600, and the paraffin 820 is uniformly disposed on the inner sidewall of the cover housing 600 along the circumferential direction. At the beginning of the casting process, the molten steel radiation heat enables the paraffin 820 to be burned, and then the residual oxygen in the cover body shell 600 is consumed by the paraffin 820, so that oxygen is prevented from entering the molten steel, and the molten steel is protected; and the uniform arrangement of the paraffin 820 makes the consumption of the oxygen remaining in the cover casing 600 more uniform and sufficient. The inner sidewall of the cover body case 600 is provided with a fixing member 810 protruding from the sidewall, and the paraffin 820 is fixed to the fixing member 810. The fixing member 810 may be a supporting plate/pin for fixing the wax 820 on the inner sidewall of the cover housing 600 more firmly.

As shown in FIG. 8, the height of the middle injection pipe 100 of the ingot unit is the same as that of the ingot mold 200, and the bottom of the middle injection pipe 100 and the bottom of the ingot mold 200 are communicated with each other through a draft tube 300. The middle injection pipe 100 is sequentially provided with the high-temperature-resistant layer 120 and the heat insulation layer 110 from inside to outside, and the thickness of the high-temperature-resistant layer 120 is smaller than that of the heat insulation layer 110, so that the heat dissipation of the molten steel 500 in the middle injection pipe 100 can be reduced; furthermore, the inlet of the middle pouring pipe 100 is provided with a liquid inlet funnel, which can prevent the molten steel 500 from splashing outside when the molten steel 500 is poured. It should be noted that the bottom of the central pouring tube 100 is provided with a molten steel outlet 130, the bottom of the ingot mold 200 is provided with a molten steel inlet 210, and the area of the molten steel outlet 130 is larger than that of the molten steel inlet 210, so that the molten steel 500 injection speed can be ensured, and the cooled finished product can be conveniently demoulded.

The ingot mold 200 is used for cooling the molten steel 500, and the outer wall of the ingot mold 200 is provided with the heat insulation layer, so that the molten steel 500 can be prevented from being cooled too fast, and the product quality is improved. The area of the upper cross section of the ingot mold 200 is larger than that of the lower cross section, the height from the cross section of the ingot mold 200 to the bottom of the ingot mold 200 is H, and the area of the cross section of the ingot mold 200 is a continuously increasing function related to H, so that the device has a structure with a large upper part and a small lower part; the design is beneficial to cooling the central part of the lower layer molten steel 500, so that the overall temperature is uniform, the defects of central segregation, central porosity and the like of the steel ingot are further reduced, and the quality of a finished product is improved.

The water cooling pipe 400 is arranged at the lower part of the outer wall of the ingot mould 200 in a surrounding mode, the water cooling pipe 400 is provided with a water inlet 410 and a water outlet 420, the ground clearance of the water inlet 410 is D1, the ground clearance of the water outlet 420 is D2, the ground clearance of the highest position of the ingot mould 200 is D3, D1 is less than D2, and D2: D3 is 1/4-1/3. Cooling the lower part of the ingot mold 200 by using flowing water to accelerate the cooling speed of the molten steel 500 at the lower layer; furthermore, the bottom-up water feeding mode can minimize the temperature of the flowing water contacted by the molten steel 500 at the lowest layer, and can discharge the hot water which has been used for cooling from the upper opening immediately, so as to achieve the best cooling effect. A gap is formed between the pipelines of the water-cooling pipes 400, so that heat exchange between the water-cooling pipes can be prevented, and the cooling effect of the water-cooling pipes is reduced. The water inlet 410 is provided with a water inlet flange 411, and the water outlet 420 is provided with a water outlet flange 421, so that the water cooling pipe 400 can be conveniently detached when the ingot mold 200 needs to be lifted.

In this embodiment, the paraffin 820 is provided on the side wall of the inner upper portion of the cover housing 600, and 1/3 to 1/2, which is the height of the paraffin 820 as the entire height of the cover housing 600, is provided in the height direction, because the molten steel is mainly exposed to the upper portion in the cover housing 600, the paraffin 820 is mainly burned at the upper portion in the cover housing 600, and the molten steel is specifically protected. The water cooling pipe 400 is disposed in the heat insulating layer of the ingot mold 200, and the molten steel outlet 130 at the bottom of the tundish pipe 100 and the molten steel inlet 210 at the bottom of the ingot mold 200 are on the same horizontal line.

Example 2

As shown in fig. 9, the basic contents of this embodiment are different from those of embodiment 1 in that: the water cooling pipe 400 is disposed around the outside of the heat insulating layer of the ingot mold 200, and the molten steel outlet 130 at the bottom of the tundish pipe 100 and the molten steel inlet 210 at the bottom of the ingot mold 200 are on the same horizontal line.

The invention has been described above in detail with reference to specific exemplary embodiments. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to illustrate the present state of the art and the meaning of the present development and is not intended to limit the present invention or the present application and the field of application of the present invention.

More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, such as combinations between various embodiments, adapted changes and/or substitutions as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims (10)

1. A1 Cr17Ni2 or 5CrNiMoV molten steel casting system with a movable airtight cover is characterized in that: comprises an ingot casting unit, an airtight cover and a moving unit;

the ingot casting unit comprises a central injection pipe (100) and an ingot mold (200), and the airtight cover is arranged above the central injection pipe (100) and the ingot mold (200) in a reciprocating manner through the moving unit;

the airtight cover comprises a cover body shell (600) and a second rotating shaft (903), the cover body shell (600) is composed of 2 half shells (603), the second rotating shaft (903) is arranged at the joint of the half shells (603), and the half shells (603) are rotatably connected through the second rotating shaft (903);

the moving unit comprises a first rotating shaft (901) and a lifter (902), and the airtight cover is arranged on the first rotating shaft (901) through the lifter (902).

2. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 1, wherein: the cover body shell (600) is provided with a water gap accommodating hole (601), a casting accommodating hole (602) and an injection pipe, the water gap accommodating hole (601) is formed in the top of the cover body shell (600), the casting accommodating hole (602) is formed in the bottom (620) of the cover body shell (600), and the injection pipe is connected with an air source through a vent pipe.

3. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 1, wherein: the bottom of the pouring pipe (100) is communicated with the bottom of the ingot mould (200) through a drainage pipe (300), and a water cooling pipe (400) is arranged on the lower portion of the outer wall of the ingot mould (200).

4. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 1, wherein: be provided with paraffin (820) on the inside lateral wall of cover body shell (600), paraffin (820) evenly set up in the inside lateral wall of cover body shell (600) along the circumferencial direction.

5. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 1, wherein: the height of the central pouring pipe (100) is the same as that of the ingot mould (200).

6. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 1, wherein: the height of the cross section of the ingot mold (200) from the bottom of the ingot mold (200) is H, and the area of the cross section of the ingot mold (200) is a continuously increasing function of H.

7. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 1, wherein: the middle injection pipe (100) is sequentially provided with a high temperature resistant layer (120) and a heat insulation layer (110) from inside to outside.

8. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 2, wherein: refractory wool (610) is arranged around the nozzle accommodating hole (601).

9. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 2, wherein: the blowing pipe comprises an upper blowing pipe (710) and a lower blowing pipe (720), the blowing direction of the upper blowing pipe (710) is arranged in an upward inclined mode, the blowing direction of the lower blowing pipe (720) is arranged in a downward inclined mode, the upper blowing pipe (710) is connected with an air source through an upper vent pipe (711), and the lower blowing pipe (720) is connected with the air source through a lower vent pipe (721).

10. The hermetic cover removable 1Cr17Ni2 or 5CrNiMoV molten steel casting system according to claim 3, wherein: the water cooling pipe (400) is provided with a water inlet (410) and a water outlet (420), the ground clearance of the water inlet (410) is D1, the ground clearance of the water outlet (420) is D2, the ground clearance of the highest position of the ingot mould (200) is D3, D1 is less than D2, and D2: D3 is 1/4-1/3.

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