阅读说明：本技术 一种废钢预热密封装置及电弧炉 (Scrap steel preheating sealing device and electric arc furnace ) 是由 谈存真 于 2019-11-04 设计创作，主要内容包括：本发明涉及一种废钢预热密封装置及电弧炉,属于冶金技术领域。其中,一种废钢预热密封装置,包括料槽、依次对应设置在料槽上方的密封罩和烟气罩,以及安装在密封罩上且可绕回转中心点摆动的密封门组,所述密封门组至少有一套；所述密封门组包括设置在回转中心点下端的覆盖密封罩与料槽所形成的端面区域的密封门板,以及设置在回转中心点上端的抵消密封门板摆动状态重力矩的平衡单元；所述烟气罩上设有烟气出口。该密封装置易于控制、密封效果好、使用寿命长,提高生产效率,降低维护成本。(The invention relates to a scrap steel preheating sealing device and an electric arc furnace, and belongs to the technical field of metallurgy. The scrap steel preheating sealing device comprises a trough, a sealing cover and a flue gas cover which are sequentially and correspondingly arranged above the trough, and a sealing door group which is arranged on the sealing cover and can swing around a rotation central point, wherein at least one sealing door group is provided; the sealing door group comprises a sealing door plate which is arranged at the lower end of the rotation central point and covers an end surface area formed by the sealing cover and the trough, and a balancing unit which is arranged at the upper end of the rotation central point and offsets the gravity moment of the sealing door plate in a swinging state; and a flue gas outlet is arranged on the flue gas hood. The sealing device is easy to control, good in sealing effect and long in service life, improves the production efficiency and reduces the maintenance cost.)

1. The scrap steel preheating sealing device is characterized by comprising a trough, a sealing cover and a flue gas cover which are sequentially and correspondingly arranged above the trough, and a sealing door group which is arranged on the sealing cover and can swing around a rotation central point, wherein at least one sealing door group is provided; the sealing door group comprises a sealing door plate which is arranged at the lower end of the rotation central point and covers an end surface area formed by the sealing cover and the trough, and a balancing unit which is arranged at the upper end of the rotation central point and offsets the gravity moment of the sealing door plate in a swinging state; and a flue gas outlet is arranged on the flue gas hood.

2. The scrap steel preheating and sealing apparatus according to claim 1, wherein the balancing unit is a weight, so that the center of gravity of the sealing door group in a free state is located at 0 to h/2 below the center of rotation, and h is the height of the sealing door panel.

3. The scrap steel preheating and sealing apparatus according to claim 2, wherein the counterweight is formed by stacking a plurality of sub-counterweights.

4. The scrap preheating and sealing apparatus in accordance with claim 1, wherein the balancing unit is an elastic member, and the sealing door panel is closed when the elastic member is in a free state.

5. The scrap preheating sealing apparatus according to claim 4, wherein the elastic member is a spring having one end connected to an upper end of the rotation center point and the other end connected to the sealing cap.

6. The scrap steel preheating and sealing device according to claim 1, wherein the sealing door panel is composed of at least two sub-door panels which are arranged side by side and can swing independently, and the sub-door panels jointly block the end surface area formed by the sealing cover and the trough; and the sub-balancing units are correspondingly arranged above the sub-door plates and jointly form a balancing unit of the sealing door group.

7. The scrap steel preheating and sealing apparatus according to claim 1, wherein the upper end of the sealing door panel is connected to a driving shaft, the driving shaft is hinged to the sealing housing through bearing blocks respectively installed at both ends, a connecting shaft vertically connected to the driving shaft is further provided above one end of the driving shaft, and the balancing unit is provided on the connecting shaft.

8. The scrap steel preheating and sealing device according to claim 1, further comprising a sealing fan disposed on the sealing cover, wherein at least one set of sealing door set is disposed on a side of the sealing fan adjacent to the feeding port.

9. The scrap steel preheating sealing device according to any one of claims 1 to 8, wherein two sets of the sealing door groups are arranged along the scrap steel conveying direction.

10. An electric arc furnace, comprising an electric arc furnace body, a scrap steel preheating device and a scrap steel preheating sealing device which are arranged in sequence, wherein the scrap steel preheating sealing device is the scrap steel preheating sealing device as claimed in any one of claims 1 to 8.

Technical Field

The invention belongs to the technical field of metallurgy, and relates to a scrap steel preheating sealing device and an electric arc furnace.

Background

In the field of electric arc furnace steelmaking, the continuous scrap preheating and feeding technology realizes continuous feeding and continuous preheating of scrap steel, so that continuous melting and continuous smelting are guaranteed, production efficiency is improved, energy is saved, consumption is reduced, and the continuous scrap preheating and feeding device is widely popularized and applied at home and abroad. In the practical application of the scrap preheating electric arc furnace, the feeding port needs to be dynamically sealed in order to prevent gas exchange between the feeding port and the outside.

The existing dynamic sealing device has high sealing control difficulty and poor sealing effect, so that the dust removal effect is poor, a flue is blocked, and the difficulty is brought to the recycling of the waste heat of the flue gas and the treatment of dioxin. The sealing door used by the existing dynamic sealing device usually adopts a soft curtain, an elastic tube or a thin side laminated plate, and the strength and the rigidity of the thin side laminated plate are lower, so that the sealing door is very easy to bend, deform and even break. Moreover, because the scrap steel added into the electric arc furnace is various in form, the scrap steel is often wound on a soft curtain, an elastic pipe or a side laminated plate in the process of conveying the scrap steel, the sealing door is damaged or even broken, the charging process is blocked, the scrap steel is blocked and blocked, the due sealing effect cannot be achieved, and the scrap steel becomes a fault point needing frequent maintenance and treatment.

Disclosure of Invention

In view of the above, the present invention provides a scrap preheating and sealing device and an electric arc furnace, which are easy to control sealing, have good sealing effect and long service life, ensure smooth feeding, and improve production efficiency.

In order to achieve the purpose, the invention provides the following technical scheme:

a scrap steel preheating sealing device comprises a material groove, a sealing cover and a smoke cover which are sequentially and correspondingly arranged above the material groove, and a sealing door group which is arranged on the sealing cover and can swing around a rotation central point, wherein at least one sealing door group is provided; the sealing door group comprises a sealing door plate which is arranged at the lower end of the rotation central point and covers an end surface area formed by the sealing cover and the trough, and a balancing unit which is arranged at the upper end of the rotation central point and offsets the gravity moment of the sealing door plate in a swinging state; and a flue gas outlet is arranged on the flue gas hood.

Further, the balance unit is a balance weight, so that the center of gravity of the sealing door group in a free state is located at a position of 0-h/2 below the rotation center, and h is the height of the sealing door plate.

Furthermore, the counterweight is formed by superposing a plurality of sub-counterweights.

Further, the balancing unit is an elastic element, and when the elastic element is in a free state, the sealing door plate is closed.

Furthermore, the elastic element is a spring with one end connected to the upper end of the rotation central point and the other end connected to the sealing cover.

Furthermore, the sealing door plate is composed of at least two sub-door plates which are arranged in parallel and can independently swing, and the sub-door plates jointly block an end surface area formed by the sealing cover and the trough; and the sub-balancing units are correspondingly arranged above the sub-door plates and jointly form a balancing unit of the sealing door group.

Furthermore, the upper end of the sealing door plate is connected to the transmission shaft, the transmission shaft is hinged to the sealing cover through bearing seats respectively installed at two ends, a connecting shaft vertically connected with the transmission shaft is further arranged above one end of the transmission shaft, and the balancing unit is arranged on the connecting shaft.

And furthermore, the device also comprises a sealing fan arranged on the sealing cover, and one side of the sealing fan, which is close to the feeding port, is at least provided with a set of sealing door set.

Furthermore, two sets of sealing door sets are arranged along the scrap steel conveying direction.

The utility model provides an electric arc furnace, is including the electric arc furnace body, scrap steel preheating device and the scrap steel preheating sealing device that set gradually, the scrap steel preheating sealing device is foretell arbitrary scrap steel preheating sealing device.

The invention has the beneficial effects that:

(1) the sealing door plate swings along with the surface of the scrap steel material layer, is always tightly attached to the surface of the material layer, is easy to control, has good sealing effect, is economic and reliable, is beneficial to dust removal, flue gas waste heat recovery and waste gas treatment, and avoids blocking a flue.

(2) The sealing door plate is of an integral structure with a smooth surface, cannot be connected and wound with scrap steel, has high strength and rigidity and is not easy to deform; the continuity of scrap steel conveying is guaranteed, and the production benefit of enterprises is further guaranteed; the sealing device can not be damaged by the scrap steel in the feeding process, such as tension cracking and the like, the service life is prolonged, and the maintenance cost is reduced.

(3) The balance unit offsets most gravity moments when the sealing door plate swings, and the sealing door plate can be pushed away easily by the scrap steel, so that the normal conveying of the scrap steel cannot be hindered.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is illustrated by the following drawings:

FIG. 1 is a schematic structural diagram of a scrap preheating sealing device and an electric arc furnace according to an embodiment;

FIG. 2 is a schematic structural diagram of a sealing door assembly according to the first embodiment;

FIG. 3 is a right side view of the sealing gate set shown in FIG. 2;

FIG. 4 is a schematic structural view of a sealing door assembly according to the second embodiment;

FIG. 5 is a schematic structural view of a sealing door assembly according to a third embodiment;

FIG. 6 is a schematic structural view of a sealing door assembly according to a fourth embodiment;

reference numerals: the device comprises an electric arc furnace body 1, a scrap steel preheating device 2, a scrap steel preheating sealing device 3, a trough 31, a sealing cover 32, a flue gas cover 33, a flue gas outlet 331, a sealing door group 34, a sealing door panel 341, a counterweight 342, a connecting shaft 343, a bearing seat 344, a transmission shaft 345, a spring 346, a sub door panel 347, a sub counterweight 348, a scrap steel layer 4, a material layer surface 41, a sealing fan 5, a rotation center A and a gravity center B.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.