CN2402425Y - Flow controlled mould - Google Patents

Abstract

A flow-controlled crystallizer comprises a crystallizer and an electromagnet. The electromagnet and crystallizer are separate components; the iron core and coil of the electromagnet are installed separately outside the crystallizer, while only a portion of the iron core is inside the crystallizer, which is fitted with the electromagnet using a small-gap process. This invention features high efficiency, convenient maintenance, and effectively improves the quality of cast billets.

Description

A flow control crystallizer

The utility model belongs to equipment for metallurgical ingot casting, in particular to a crystallizer formed by continuous pouring of liquid metal.

In the continuous casting process of metal, in order to improve the quality of the slab, it is necessary to control the flow rate of the submerged nozzle and the fluctuation of the meniscus in the mold; the more advanced flow control mold used in the existing technology, it passes through the crystallizer A constant and stable magnetic field is set at the outlet of the inner submerged nozzle and the meniscus area, so that the movement of the liquid metal cuts the magnetic force line to generate an induced current and an electromagnetic force in the opposite direction of movement, thereby achieving the purpose of improving the quality of the billet. However, one kind of setting of the constant and stable magnetic field of the existing flow control crystallizer is to set the electromagnet completely in the water cooling jacket of the crystallizer to form an integral body with the crystallizer; the other is to completely set the electromagnet outside the water cooling jacket of the crystallizer , Both of these situations make the electromagnet vibrate with the crystallizer at the same time, resulting in a large vibration device, inflexible maintenance control, and low efficiency.

The purpose of the utility model is to provide a flow control crystallizer in which the whole electromagnet does not vibrate with the crystallizer, and only a small part of the iron core vibrates with the crystallizer. The magnetic poles on the upper and lower sides of the crystallizer are different, but the N and S poles on both sides can be arranged arbitrarily.

The utility model is realized by following scheme. Its structure is composed of a crystallizer with a part of the iron core and an electromagnet outside the crystallizer. The electromagnet and the crystallizer adopt a split type. The iron core and coil of the electromagnet body are designed and installed separately outside the mold. They do not form a whole with the mold. There are only part of the iron core in the mold. The iron main body is matched, and the general gap is 3-5mm. The exposed cross-sectional area of the iron core in the crystallizer water-cooling jacket is equal to the thickness of the outer electromagnet iron core plus 2 times the mold amplitude, so that when the mold vibrates, the inner and outer iron cores Within the effective transmission range of magnetic flux lines. When the crystallizer vibrates, the main body of the electromagnet outside the crystallizer does not move. In order to improve the efficiency of the electromagnet, part of the iron core is set in the crystallizer water jacket, but no coil is installed. The gap between the water gap must be fully considered, and this part of the iron core is installed together with the crystallizer shell. Therefore, the crystallizer shell must be used Made of non-magnetic material.

Below with accompanying drawing and embodiment the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the main structure of the electromagnet;

FIG. 3 is a top view of FIG. 2 .

In the picture: 1 crystallizer, 2 coils, 3 iron cores.

Example: Flow Control Mold for Continuous Casting

a: Continuous casting process conditions:

Slab size: 50×200(mm), casting speed 3m/min, mold copper plate thickness: δ ₁ =10～12(mm), water joint: δ ₂ =6～8(mm), vibration mode is not limited ( There is a place to install the electromagnet), steel type: Q235, etc.

b: Solenoid design:

Industrial pure iron is used as the core material of the electromagnet; the maximum magnetic induction intensity at the working end of the magnetic pole is 0.6T; the calculation of the electromagnet parameters: taking the total length of the air gap as 90mm, the air gap reluctance is

Rg＝lg/(μ·Ag)＝9/(1.25·10 ^-8 ·20·2)＝1.35×107(1/henry)

Ampere-turns:

I·W＝φ·Rg·10 ^-8 ＝20·2·6000·1.35×10 ⁷ ·10 ^-8 ＝43200(A)

Fully consider the design margin, when the flux leakage coefficient is taken as δ=5, the total ampere-turns can be taken as 216000A.

When the coil current is 1000A, the total number of turns of the coil is 200 turns, and the number of turns on one side is 100 turns; each working arm is arranged with a double-layer coil structure; Conductor, copper tube wall thickness is 2mm);

The coil adopts the central water cooling process.

In the above formula: 1g--the total length of the working air gap, μ--the magnetic permeability in vacuum, Ag--the working cross-sectional area of the electromagnet, I--the current intensity, W--the total number of turns of the wire, δ--flux leakage coefficient.

DC power supply:

DC power supply is 2000A, continuously adjustable from 0 to 2000;

To adapt to the characteristics of large inductive loads, there must be filtering after DC rectification.

The utility model can effectively improve the quality of the billet, and has the advantages of high efficiency, convenient maintenance and the like.

Claims (3)

1, a kind of flow control mold that includes crystallizer and electromagnet, it is characterized in that taking between the electromagnet of this flow control mold and the crystallizer split type, the iron core of electromagnet main body and coil are installed separately outside crystallizer, has only the part iron core in the crystallizer, cooperate with the electromagnet main body with little gap technology, general gap is 3～5mm.

2, flow control mold according to claim 1 is characterized in that said part iron core in crystallizer is to be installed together with the crystallizer shell, and the crystallizer shell will be made of no magnetic material.

3, flow control mold according to claim 1 is characterized in that sectional area that the said part iron core that is positioned in the crystallizer is exposed equals to be located at crystallizer outside electromagnet core thickness and adds 2 times crystallizer vibration amplitude.

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