Steel-making ladle scrap steel preheating device

Abstract

The utility model relates to steelmaking equipment, in particular to a steel scrap preheating device for a steelmaking ladle. The deep position of the oxygen lance can be adjusted according to the scrap steel amount in the ladle, so that the scrap steel preheating efficiency is effectively improved, and energy consumption is reduced; the device specifically comprises a bottom sliding table unit used for containing a hot metal ladle and a hot metal ladle cover lifting unit located on one side of the bottom sliding table unit, the hot metal ladle cover lifting unit is used for opening and closing a hot metal ladle cover, and a first oxygen lance hole used for an oxygen lance to penetrate through is formed in the top of the hot metal ladle cover; the ladle cover lifting unit is further provided with an oxygen lance lifting unit used for stretching and retracting of an oxygen lance. The nozzle end of the oxygen lance penetrates through the first oxygen lance hole, and an oxygen lance main pipe of the oxygen lance is fixed to the oxygen lance lifting unit.

Description

Technical Field

[0001] The utility model relates to steelmaking equipment, in particular to a waste steel preheating device for a molten iron ladle in steelmaking. Background Art

[0002] In the smelting process of the iron and steel industry, the iron-containing raw materials mainly come from two ways: ores and waste steel. Ores are natural resources, while waste steel is recycled resources recovered from society. Using waste steel as a direct raw material for steelmaking can save complex processes such as sintering, coking, and ironmaking, thus effectively reducing energy consumption and environmental pollution. In addition, the use of waste steel can also promote the effective recycling of waste metal resources accumulated in society. Therefore, in order to improve the economic benefits of iron and steel enterprises, it is particularly important to deeply study and increase the proportion of waste steel in the converter.

[0003] Increasing the proportion of waste steel in the converter smelting process has become an inevitable trend in the development of iron and steel enterprises at home and abroad. By increasing the utilization rate of waste steel, not only can the consumption of molten iron per ton of steel be reduced, but also the goals of energy conservation, environmental protection, increased production, and efficiency can be achieved. Currently, one of the main methods to reduce molten iron consumption is to increase the input amount of waste steel in the converter. However, the waste steel must be fully preheated before entering the converter, otherwise it may disrupt the heat balance in the converter, and then have an adverse impact on the operation of the oxygen lance, the control of the end-point composition, and the regulation of the end-point temperature. Therefore, ensuring the sufficiency of waste steel preheating is crucial for optimizing the converter smelting process.

[0004] Another preheating method is to preheat through the oxygen lance. In this method, the oxygen lance is usually fixedly installed at the entrance of the molten iron ladle, and it is difficult to reach an appropriate position inside the ladle to fully preheat the waste steel. This not only results in poor preheating effect but also increases energy consumption. Therefore, both of these two traditional preheating methods have obvious limitations in practical applications, restricting their effectiveness in increasing the temperature of waste steel entering the furnace. To overcome these challenges, developing more efficient and safe waste steel preheating technology has become a key direction for the industry's development. Summary of the Invention

[0005] The utility model aims at the defects existing in the prior art and provides a waste steel preheating device for a molten iron ladle in steelmaking.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme, including a bottom sliding table unit for placing the molten iron ladle, and a molten iron ladle cover lifting unit located on one side of the bottom sliding table unit. The molten iron ladle cover lifting unit is used for opening and closing the molten iron ladle cover. An oxygen lance hole one for the oxygen lance to pass through is opened at the top of the molten iron ladle cover. The molten iron ladle cover lifting unit is also provided with an oxygen lance lifting unit for the telescopic movement of the oxygen lance. The nozzle end of the oxygen lance passes through the oxygen lance hole one, and the oxygen lance main pipe of the oxygen lance is fixed on the oxygen lance lifting unit.

[0007] Furthermore, the bottom sliding table unit includes a sliding table plate slidably mounted on two tracks. A sliding table plate oil cylinder is arranged between the two tracks and below the sliding table plate, and the piston rod of the sliding table plate oil cylinder is parallel to the two tracks; the sliding table plate oil cylinder is fixed to the ground through an oil cylinder fixing seat; the end of the piston rod of the sliding table plate oil cylinder is connected to the sliding table plate through an oil cylinder connecting plate; and it is used to pull the sliding table plate to slide back and forth along the two tracks.

[0008] Furthermore, walking wheel systems are arranged on both sides of the bottom of the sliding table plate, and the sliding table plate walks on the corresponding tracks through the walking wheel systems.

[0009] Furthermore, a retaining ring is arranged on the upper surface of the sliding table plate, and the ladle is placed within the retaining ring for positioning the ladle.

[0010] Furthermore, the ladle cover lifting unit includes a support base. An elevating mechanism frame is installed on the top of the support base, and a lifting oil cylinder with its piston rod facing upward is installed within the support base. The piston rod of the lifting oil cylinder passes through the oil cylinder rod through-hole at the top of the support base and is connected to a lifting slider. The lifting slider is slidably arranged on two guide shafts I, and the two guide shafts I are vertically arranged within the elevating mechanism frame; and one side of the lifting slider facing the bottom sliding table unit is connected to the ladle cover through a horizontal cover mounting plate.

[0011] When the lifting oil cylinder expands and contracts, it drives the lifting slider on the piston rod to move up and down along the guide shaft I, and further drives the ladle cover to lift through the cover mounting plate; in cooperation with the bottom sliding table unit, it completes the operation of covering or uncovering the ladle.

[0012] Furthermore, a fire baffle is arranged on the bottom of the cover mounting plate near one side of the elevating mechanism frame to prevent the flame from damaging the ladle cover lifting unit.

[0013] Furthermore, the oxygen lance lifting unit includes an oxygen lance lifting unit frame arranged on the top of the cover mounting plate. The oxygen lance lifting unit frame is in the shape of a rectangular frame, and a lead screw and two guide shafts II are vertically arranged in parallel within the rectangular frame. The lead screw can rotate freely relative to the rectangular frame, and a nut slider is drivingly connected to the lead screw, and the nut slider is slidably connected to the guide shaft II; the nut slider is connected to an oxygen lance bracket for fixing the oxygen lance; and the lead screw is driven to rotate by a motor.

[0014] Furthermore, the oxygen lance is connected to an oxygen supply system through an oxygen lance hose.

[0015] Furthermore, an oxygen lance hole II for the oxygen lance to pass through is arranged on the cover mounting plate.

[0016] The beneficial effects of the present utility model compared with the prior art.

[0017] The utility model aims at the existing problem of oxygen lance preheating. By arranging an oxygen lance hole in the middle of the ladle cover and a separately configured oxygen lance lifting mechanism, the depth position of the oxygen lance can be adjusted according to the amount of scrap steel in the ladle, so as to effectively improve the preheating efficiency of scrap steel and reduce energy consumption. At the same time, a fire baffle is added to the side of the ladle cover, which can effectively block the high-temperature damage to the equipment caused by the flame. In addition, the design of the bottom slide unit realizes the conversion between offline and online operations of the ladle, which greatly facilitates the lifting operation of the overhead crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the present utility model in conjunction with the drawings and specific embodiments. The protection scope of the present utility model is not limited to the description of the following content.

[0019] Figure 1 is the front view of a scrap steel preheating device for a steelmaking ladle.

[0020] Figure 2 is the top view of a scrap steel preheating device for a steelmaking ladle.

[0021] Figure 3 is the three-dimensional view of a scrap steel preheating device for a steelmaking ladle Figure 1 .

[0022] Figure 4 is the three-dimensional view of a scrap steel preheating device for a steelmaking ladle Figure 2 .

[0023] In the figure, 1 is the bottom slide unit; 2 is the ladle cover lifting unit; 3 is the oxygen lance lifting unit; 4 is the ladle.

[0024] 101 is the slide plate; 102 is the track; 103 is the walking wheel system; 104 is the retaining ring; 105 is the slide plate oil cylinder; 106 is the oil cylinder fixing seat; 107 is the oil cylinder connecting plate.

[0025] 201 is the support base; 202 is the lifting mechanism frame; 203 is the ladle cover; 204 is the cover mounting plate; 205 is the second oxygen lance hole; 206 is the lifting oil cylinder; 207 is the oil cylinder rod through hole; 208 is the first guide shaft; 209 is the lifting slider; 210 is the first guide shaft fixing bolt; 211 is the fire baffle.

[0026] 301 is the oxygen lance; 302 is the oxygen lance hose; 303 is the oxygen lance support; 304 is the motor; 305 is the lead screw; 306 is the second guide shaft; 307 is the oxygen lance lifting unit frame; 308 is the lead screw nut slider. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions and beneficial effects of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model.

[0028] As Figures 1-4 shown, the scrap steel preheating device for the molten iron ladle of the present utility model includes a bottom sliding table unit 1, a molten iron ladle cover lifting unit 2, and an oxygen lance lifting unit 3.

[0029] Embodiment 1, bottom sliding table unit 1:

[0030] The sliding table plate 101 is installed on the track 102 and moves on the track through the traveling wheel system 103.

[0031] The retaining ring 104 is arranged on the top of the sliding table plate 101 for positioning the molten iron ladle 4.

[0032] The sliding table plate oil cylinder 105 is fixed to the ground through the oil cylinder fixing seat 106. The oil cylinder connecting plate 107 is used to connect the oil cylinder piston rod and the sliding table plate 101 for driving the movement of the sliding table plate 101.

[0033] Embodiment 2, molten iron ladle cover lifting unit 2:

[0034] The support base 201 provides the basic support for the whole unit, and the support base 201 adopts a rectangular frame form.

[0035] The lifting mechanism frame 202 is installed on the top of the support base 201 and serves as the main structure for the lifting of the molten iron ladle cover 203.

[0036] The molten iron ladle cover 203 is fixed to the lifting mechanism frame 202 through the cover mounting plate 204.

[0037] The guide shaft 208 cooperates with the lifting slider 209 to ensure the linear movement of the molten iron ladle cover 203 during the lifting process.

[0038] The fire baffle 211 is installed on one side of the cover mounting plate to prevent the flame from damaging the equipment.

[0039] Embodiment 3, oxygen lance lifting unit 3:

[0040] The oxygen lance 301 is connected to the oxygen supply system through the oxygen lance hose 302.

[0041] The oxygen lance bracket 303 is used to fix the oxygen lance. The motor 304 drives the rotation of the lead screw 305, and drives the oxygen lance to move up and down along the guide shaft 306 through the lead screw nut slider 308 to realize the lifting of the oxygen lance.

[0042] The lance lifting unit frame 307 provides support for the above components and is installed on the ladle cover lifting unit to ensure that the lance can accurately insert into the lance hole 1 of the ladle cover 203.

[0043] In summary, these three units cooperate with each other to realize the preheating process of the ladle. The bottom sliding table unit 1 is responsible for the entry and exit of the ladle, the ladle cover lifting unit 2 is responsible for the opening and closing of the ladle cover 203, and the lance lifting unit 3 is responsible for the telescoping of the lance 301, jointly completing the preheating treatment of the scrap steel.

[0044] The usage process of the present utility model will be described in combination with the accompanying drawings and technical solutions:

[0045] 1. When it is necessary to preheat the scrap steel, first pour the scrap steel into the ladle, and the pouring amount is determined according to the actual steelmaking consumption.

[0046] 2. Lift the ladle filled with cold charge scrap steel to the sliding table plate 101 of the bottom sliding table unit 1 by a crane (at this time, the sliding table plate oil cylinder 105 is in the extended state), and the bottom sliding table unit 1 is in the offline state. Place the ladle into the retaining ring 104 on the sliding table plate 101.

[0047] 3. The sliding table plate oil cylinder 105 acts to pull the sliding table plate 101 to the online state position. The lifting oil cylinder in the ladle cover lifting unit 2 acts to lower the ladle cover 203 to cover the ladle, and the lance 301 is started.

[0048] 4. According to the amount of scrap steel added to the ladle, control the lance lifting unit 3 so that the lance 301 extends from the center lance hole of the ladle cover 203 into the ladle. The specific extension distance can be controlled according to the actual amount of scrap steel. The purpose is to enable the flame of the lance 301 to preheat the scrap steel at a short distance and achieve efficient preheating.

[0049] 5. When the preheating is completed, control the motor of the lance lifting unit 3 to lift the lance support 303, that is, to lift the lance 301 from the ladle, and end the scrap steel preheating work. The lifting oil cylinder controls to lift the ladle cover 203 to a certain height, which can facilitate the offline of the preheated ladle.

[0050] 6. The preheated ladle is driven by the sliding table plate oil cylinder to go offline (the ladle is separated from the ladle cover), which is convenient for the crane to lift the preheated ladle away from the preheating station.

[0051] 7. A fire baffle 211 is installed at the corresponding position below the cover mounting plate 204 and corresponding to the cover to prevent the flame ejected from between the ladle and the cover during the ladle preheating process from affecting the equipment, and an effective blocking effect can be achieved.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; thus, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A scrap steel preheating device for a steelmaking ladle, comprising a bottom slide unit (1) for placing the ladle, and a ladle cover lifting unit (2) located on one side of the bottom slide unit (1), characterized in that: The ladle cover lifting unit (2) is used for opening and closing the ladle cover (203); an oxygen lance hole 1 for the oxygen lance (301) to pass through is provided on the top of the ladle cover (203); the ladle cover lifting unit (2) is also provided with an oxygen lance lifting unit (3) for retracting the oxygen lance (301); a nozzle end of the oxygen lance (301) passes through the oxygen lance hole 1, and an oxygen lance main pipe of the oxygen lance (301) is fixed on the oxygen lance lifting unit (3).

2. The scrap steel preheating device for a steelmaking ladle according to claim 1, characterized in that: The bottom slide unit (1) comprises a slide plate (101) slidably mounted on two rails (102); a slide plate oil cylinder (105) is arranged below the slide plate (101) and between the two rails (102); the piston rod of the slide plate oil cylinder (105) is parallel to the two rails (102); the slide plate oil cylinder (105) is fixed on the ground through an oil cylinder fixing seat (106); the end of the piston rod of the slide plate oil cylinder (105) is connected to the slide plate (101) through an oil cylinder connecting plate (107); and the slide plate (101) is used to pull the slide plate (101) to slide forward and backward along the two rails (102).

3. The scrap steel preheating device for a steelmaking ladle according to claim 2, characterized in that: Traveling wheel trains (103) are arranged on both sides of the bottom of the slide plate (101), and the slide plate (101) travels on the corresponding track (102) via the traveling wheel trains (103).

4. The scrap steel preheating device for a steelmaking ladle according to claim 2, characterized in that: The upper surface of the slide plate (101) is provided with a retaining ring (104), and the molten iron ladle (4) is placed in the retaining ring (104) for positioning the molten iron ladle (4).

5. The scrap steel preheating device for a steelmaking ladle according to any one of claims 1 to 4, characterized in that: The ladle cover lifting unit (2) comprises a support base (201), a lifting mechanism frame (202) is installed on the top of the support base (201), a lifting cylinder (206) with a piston rod facing upward is installed in the support base (201), the piston rod of the lifting cylinder (206) passes through the cylinder rod through hole (207) on the top of the support base (201) and is connected to a lifting slider (209), the lifting slider (209) is slidably arranged on two guide shafts, and the two guide shafts are vertically arranged in the lifting mechanism frame (202); and the lifting slider (209) is connected to the ladle cover (203) through a horizontal cover mounting plate (204) on the side facing the bottom slide unit (1).

6. The scrap steel preheating device for a steelmaking ladle according to claim 5, characterized in that: A fire baffle (211) is provided at the bottom of the cover mounting plate (204) near the lifting mechanism frame (202) to prevent flames from causing damage to the ladle cover lifting unit (2).

7. The scrap steel preheating device for a steelmaking ladle according to claim 5, characterized in that: The oxygen gun lifting unit (3) comprises an oxygen gun lifting unit frame (307) arranged on the top of the cover mounting plate (204); the oxygen gun lifting unit frame (307) is a rectangular frame, in which a lead screw (305) and a second guide shaft (306) are vertically and parallelly installed; the lead screw (305) can freely rotate relative to the rectangular frame, and a nut slider (308) is transmission-connected to the lead screw (305), and the nut slider (308) is slidably connected to the second guide shaft (306); the nut slider (308) is connected to an oxygen gun bracket (303) that fixes the oxygen gun; and the lead screw (305) is driven to rotate by a motor (304).

8. The scrap steel preheating device for a steelmaking ladle according to claim 7, characterized in that: The oxygen lance (301) is connected to the oxygen supply system via an oxygen lance hose (302).

9. The scrap steel preheating device for a steelmaking ladle according to claim 7, characterized in that: The cover mounting plate (204) is provided with an oxygen lance hole 2 (205) for the oxygen lance (301) to pass through.

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