Automatic reduced iron powder adding device for crystallizer

Abstract

The utility model discloses an automatic reduced iron powder adding device for a crystallizer. The automatic reduced iron powder adding device comprises a powder storage mechanism; the metering and conveying mechanism is arranged below the powder storage mechanism, and a feeding port of the metering and conveying mechanism is communicated with a discharging port of the powder storage mechanism; the gas control box is connected with the metering conveying mechanism so as to feed high-pressure gas to a discharge port of the metering conveying mechanism; according to the automatic reduced iron powder adding device for the crystallizer, the reduced iron powder is stored in a stock bin mode, automatic conveying of the reduced iron powder can be achieved, and the reduced iron powder is fed into the crystallizer.

Description

TECHNICAL FIELD

[0001] The utility model relates to continuous casting equipment field, more specifically, the utility model relates to a crystallizer reduced iron powder automatic adding device. BACKGROUND

[0002] The crystallizer is the heart of the continuous casting machine. Its function is to gradually solidify the high-temperature molten steel into a certain thickness of shell to ensure that the shell has sufficient strength to support and resist the static pressure of the un-solidified molten steel in the casting shell after it leaves the crystallizer. In addition, the cooling intensity and uniformity of the crystallizer are crucial. For example, if the cooling intensity of the crystallizer is not enough, the safety thickness of the shell leaving the crystallizer is not enough, which can easily cause a breakout; if the cooling intensity of the crystallizer is too large, the columnar crystals will develop when the molten steel initially solidifies in the crystallizer, which is not good for the internal quality of the casting. In order to alleviate this contradiction, the following methods are currently used by steel enterprises:

[0003] 1. Low superheat method:

[0004] The temperature of the molten steel in the tundish is generally higher than the liquidus temperature of the molten steel, which is the superheat. Under normal circumstances, the superheat is required to be within 30±5℃. If it exceeds 35℃, it is considered high superheat, and if it is below 25℃, it is considered low superheat. Generally, each furnace of molten steel has a relatively long pouring period from the start of pouring to the end of pouring, and in each pouring period, the superheat must be able to overcome the process temperature drop, otherwise the water hole will be frozen. Modern low superheat methods rely on the following methods to achieve them: full-process insulation pouring to reduce process temperature drop; tundish plasma or electromagnetic heating to ensure relatively constant tundish temperature.

[0005] 2. Feeding steel strip or wire to the crystallizer:

[0006] Feeding steel strip or wire to the crystallizer can obtain better primary grain structure and lower superheat. Through the crystallizer steel strip feeding technology, the superheat of the molten steel in the crystallizer can be reduced, the solidification process can be improved, and the length of the casting shell can be shortened; at the same time, the vibration of the steel strip can break the formed dendrites, promote nucleation, increase the nucleation rate, and thus increase the equiaxed crystal zone, improve the casting quality and production efficiency. For the low superheat method, the tundish heating method requires a large amount of power consumption, and the quality of the tundish lining material is required to be very high, which also brings some adverse side effects to the molten steel. For the method of feeding steel strip or wire to the crystallizer, the steel coil is relatively heavy and inconvenient to install, on the other hand, the steel coil is not easy to melt quickly in the crystallizer, and the effect of promoting nucleation is not as obvious as that of reduced iron powder. SUMMARY

[0007] The utility model aims at providing a crystallizer reduced iron powder automatic adding device, which stores reduced iron powder in a bin and can automatically deliver the reduced iron powder into the crystallizer.

[0008] The utility model discloses a technical scheme that solves the above technical problem: a crystallizer reduced iron powder automatic adding device, including,

[0009] Powder storage mechanism,

[0010] Metering and conveying mechanism is set below powder storage mechanism, and the feed inlet of metering and conveying mechanism communicates with the discharge port of powder storage mechanism,

[0011] Pneumatic control box is connected with metering and conveying mechanism to send high-pressure gas to the discharge port of metering and conveying mechanism,

[0012] Iron powder discharge mechanism communicates with the discharge port of metering and conveying mechanism through iron powder conveying pipeline.

[0013] Further, the powder storage mechanism includes in the crystallizer reduced iron powder automatic adding device,

[0014] Hopper, and the lower end opening communicates with the feed inlet of metering and conveying mechanism,

[0015] Movable trolley, and the hopper is arranged on the movable trolley.

[0016] Further, the hopper is equipped with a level sensor in the crystallizer reduced iron powder automatic adding device.

[0017] Further, the hopper is equipped with a sound-light alarm in the crystallizer reduced iron powder automatic adding device.

[0018] Further, the metering and conveying mechanism includes in the crystallizer reduced iron powder automatic adding device,

[0019] Screw conveyor, and the feed inlet communicates with the lower end opening of hopper, and the discharge port communicates with iron powder conveying pipeline,

[0020] Air inlet pipe, and one end communicates with the inside of screw conveyor, and the other end communicates with the gas outlet of pneumatic control box through air pipe, and the air inlet pipe is equipped with a valve.

[0021] Further, the iron powder discharge mechanism includes in the crystallizer reduced iron powder automatic adding device,

[0022] Tubular iron powder nozzle is connected with the protective slag conveying pipeline of crystallizer through quick coupling,

[0023] Support is connected with tubular iron powder nozzle.

[0024] Further, the crystallizer reduction iron powder automatic adding device, the pneumatic control box sends the high pressure gas into the metering conveying mechanism, the high pressure gas is 0.3-0.7Mpa clean compressed nitrogen or compressed air, and the flow of high pressure gas is 3-5m 3 / h.

[0025] The beneficial effects of the utility model are:

[0026] 1, the utility model discloses a crystallizer reduction iron powder automatic adding device, through the bin type storage, automatic conveying, reduction iron powder gravity auxiliary effect and gas auxiliary conveying, can realize the automatic conveying of reduction iron powder, and the reduction iron powder is sent into the crystallizer, and the adding amount control is easy to grasp.

[0027] 2, the utility model discloses a crystallizer reduction iron powder automatic adding device can share the adding material port with the protective slag of crystallizer, and the reduction iron powder can automatically stratify and first pass through the crystallizer liquid slag layer and contact with molten steel through the characteristics that the specific gravity of protective slag is less than that of reduction iron powder.

[0028] 3, the utility model discloses a crystallizer reduction iron powder automatic adding device adds reduction iron powder into the crystallizer, can be very fast and molten steel fusion, promotes the crystallization of molten steel rapid nucleation, and the effect of increasing isometric crystal rate in the crystallizer of crystallizer molten steel is obvious, and simultaneously, under the same condition, to the improvement of the drawing speed of continuous casting billet, improve production efficiency has very important significance.

[0029] The other advantages, objects and features of the utility model will be embodied partly through the following description, and the skilled in the art will also understand them through the research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the application scene diagram of the crystallizer reduction iron powder automatic adding device of the utility model.

[0031] Figure 2 It is the structure schematic diagram of the automatic adding device of the utility model. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail in connection with the drawings, so that the skilled in the art can implement according to the description text.

[0033] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Figures 1-2 An automatic iron powder addition device for crystallizer reduction provided in this utility model embodiment is characterized by comprising:

[0035] Powder storage mechanism;

[0036] A metering and conveying mechanism 1 is disposed below the powder storage mechanism, and the inlet of the metering and conveying mechanism 1 is connected to the outlet of the powder storage mechanism.

[0037] The pneumatic control box 2 is connected to the metering and conveying mechanism 1 to send high-pressure gas into the outlet of the metering and conveying mechanism 1.

[0038] The iron powder discharge mechanism is connected to the discharge port of the metering and conveying mechanism 1 through an iron powder conveying pipe.

[0039] In this embodiment, such as Figure 1 As shown, the powder storage mechanism and the pneumatic control box 2 are set on the large package platform. The reduced iron powder is stored in the powder storage mechanism. The reduced iron powder in the powder storage mechanism enters the metering and conveying mechanism 1 under the action of gravity. The metering and conveying mechanism 1 automatically conveys the reduced iron powder to the iron powder conveying pipeline. At the same time, the pneumatic control box 2 sends high-pressure gas into the metering and conveying mechanism 1. The reduced iron powder is conveyed by the high-pressure gas. The reduced iron powder enters the iron powder discharge mechanism through the iron powder conveying pipeline and is then sent into the crystallizer by the iron powder discharge mechanism.

[0040] Preferably, in another embodiment of the present invention, the powder storage mechanism includes:

[0041] The hopper 3 has its lower opening connected to the feed inlet of the metering and conveying mechanism 1;

[0042] The trolley 4 is a mobile carriage, and the hopper 3 is mounted on the mobile carriage 4.

[0043] In this embodiment, reduced iron powder is stored in hopper 3, and hopper 3 is moved by moving trolley 4, and the position of hopper 3 is adjusted according to actual needs.

[0044] Preferably, in another embodiment of the present invention, the hopper 3 is provided with a material level sensor 5.

[0045] In the embodiment, the material level sensor 5 is electrically connected with the upper computer, and the staff can monitor the amount of the reduced iron powder in the hopper 3 through the material level sensor 5 to supplement the reduced iron powder in the hopper 3 in time.

[0046] Preferably, as another embodiment of the utility model, the hopper 3 is provided with a sound-light alarm 6.

[0047] In the embodiment, the hopper 3 is provided with the sound-light alarm 6, the sound-light alarm 6 is electrically connected with the upper computer, the alarm value of the material level in the hopper 3 is set, when the material level of the reduced iron powder detected by the material level sensor 5 is lower than the alarm value, the upper computer controls the sound-light alarm 6 to alarm, reminding the on-site staff to supplement the reduced iron powder in the hopper 3 in time.

[0048] Preferably, as another embodiment of the utility model, the metering and conveying mechanism 1 comprises:

[0049] A screw conveyor, a feeding port of the screw conveyor is communicated with the lower end opening of the hopper 3, and a discharging port of the screw conveyor is communicated with the iron powder conveying pipeline;

[0050] An air inlet pipe, one end of the air inlet pipe is communicated with the inside of the screw conveyor, and the other end of the air inlet pipe is communicated with the air outlet of the air control box 2 through an air pipe, and a valve is arranged on the air inlet pipe.

[0051] In the embodiment, the air inlet pipe is arranged in the screw conveyor

[0052] The screw conveyor is electrically connected with the upper computer, the upper computer accurately controls the rotating speed of the stepping motor of the screw conveyor, adjusts the conveying speed of the screw conveyor, and the stepping motor drives the screw rod to step feed the iron powder in the pipe cylinder to the vicinity of the discharging port of the screw conveyor.

[0053] Preferably, as another embodiment of the utility model, the iron powder discharging mechanism comprises:

[0054] A tubular iron powder nozzle 7, the tubular iron powder nozzle 7 is connected with the protective slag conveying pipeline of the crystallizer through a quick connector;

[0055] A support 8, the support 8 is connected with the tubular iron powder nozzle 7.

[0056] In the embodiment, the support 8 can be made of magnetic material, the support 8 is directly fixed on the cover plate of the crystallizer, the tubular iron powder nozzle 7 is connected with the protective slag conveying pipeline of the crystallizer through a quick connector, and the tubular iron powder nozzle 7 is convenient to disassemble and assemble. The reduced iron powder automatic adding device of the crystallizer can share the adding material port with the protective slag of the crystallizer, and the reduced iron powder enters the crystallizer together with the protective slag, the specific gravity of the iron powder is 3-4 Kg / cm 3 , and the specific gravity of the protective slag is 1-2 Kg / cm 3By the feature that the specific gravity of the protecting slag is less than that of the reduced iron powder, the reduced iron powder can automatically stratify and firstly pass through the crystallizer liquid slag layer to contact with the molten steel.

[0057] Preferably, as another embodiment of the utility model, the high pressure gas sent into the metering conveying mechanism 1 by the air control box 2 is 0.3-0.7Mpa clean compressed nitrogen or compressed air, and the flow of the high pressure gas is 3-5m 3 / h.

[0058] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the embodiments shown and described herein.

Claims

1. A crystallizer reduced iron powder automatic feeding device, characterized in that, The application relates to a powder feeding device for a continuous casting machine. The powder feeding device comprises: a powder storage mechanism; a metering and conveying mechanism (1) arranged below the powder storage mechanism, a feeding port of the metering and conveying mechanism (1) being communicated with a discharging port of the powder storage mechanism; an air control box (2) connected with the metering and conveying mechanism (1) to send high-pressure gas to the discharging port of the metering and conveying mechanism (1); 2. The apparatus according to claim 1, wherein the apparatus is characterized by: an iron powder discharging mechanism communicated with the discharging port of the metering and conveying mechanism (1) through an iron powder conveying pipeline. The powder storage mechanism comprises: a hopper (3) with an open lower end communicated with the feeding port of the metering and conveying mechanism (1); 3. The apparatus according to claim 2, wherein the apparatus is characterized by: a moving trolley (4) on which the hopper (3) is arranged.

4. The apparatus according to claim 3, wherein the apparatus is characterized by: A material level sensor (5) is arranged in the hopper (3).

5. The apparatus according to claim 2, wherein the apparatus is characterized by: An audible and visual alarm (6) is arranged on the hopper (3). The metering and conveying mechanism (1) comprises: a screw conveyor with a feeding port communicated with the open lower end of the hopper (3) and a discharging port communicated with the iron powder conveying pipeline; 6. The apparatus according to claim 1, wherein the apparatus is characterized by: an air inlet pipe with one end communicated with the screw conveyor and the other end communicated with an air outlet of the air control box (2) through an air pipe, a valve being arranged on the air inlet pipe. The iron powder discharging mechanism comprises: a tubular iron powder nozzle (7) connected with a protective slag conveying pipeline of a crystallizer through a quick connector; a support (8) connected with the tubular iron powder nozzle (7).

7. The apparatus according to claim 1, wherein the apparatus is characterized by: The high-pressure gas fed into the metering delivery mechanism (1) by the gas control box (2) is clean compressed nitrogen or compressed air with a pressure of 0.3-0.7 MPa, and the flow rate of the high-pressure gas is 3-5 m 3 / h.

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