A molten iron pretreatment slagging device and a method thereof

Abstract

The application discloses a molten iron pretreatment slagging-off device and a method thereof and belongs to the technical field of slagging-off plates. The molten iron pretreatment slagging-off device comprises a connecting arm, one end of the connecting arm is fixedly connected with a supporting plate, a slagging-off plate is mounted on the surface of the supporting plate, the other end of the connecting arm is connected with a driving assembly, the slagging-off plate is driven to move by the driving assembly, and the slagging-off plate is used for slagging-off molten iron; and the bottom end of the slagging-off plate is provided with a heat insulation sleeve. The molten iron pretreatment slagging-off device is provided with the heat insulation sleeve outside the slagging-off plate, the bottom end of the slagging-off plate is prevented from directly contacting with the molten iron, and the service life of the slagging-off plate is effectively prolonged. After the slagging-off plate works for a period of time, the motor is started, the threaded plate is driven to move, the inserting rod is retracted, and then the heat insulation sleeve is detached from the slagging-off plate, so that the heat insulation sleeve can be maintained and replaced, the service life of the slagging-off plate can be effectively prolonged, the production cost is reduced, the replacement time of the slagging-off plate is reduced, and the production efficiency of a steel plant is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slag skimming plate, more particularly to a molten iron pretreatment slag skimming device and method thereof. BACKGROUND

[0002] At present, the molten iron pretreatment technology is generally used for desulfurization in large steel plants, and the slag skimming treatment directly relates to the quality of the treated molten iron in the molten iron pretreatment process. After the harmful elements such as sulfur in the steel react with the desulfurizer, the desulfurizer floats to the slag to form desulfurization slag. If the sulfur-containing desulfurization slag cannot be effectively removed from the ladle, the sulfur-containing slag will enter the next process, and the sulfur in the slag will return to the molten steel.

[0003] In the prior art, the slag skimmer is connected to the slag skimming head plate through a slag skimming arm, and the slag skimming head plate drives the slag skimming plate to skim the slag of the molten iron. The currently used slag skimming plate is mostly made of iron material and has a shovel-shaped structure. Since the slag skimming plate is in contact with the high-temperature molten iron and slag for a long time during the slag skimming process, the part of the slag skimming plate in contact with the slag and molten iron is quickly in a high-temperature red-hot state. The strength of the slag skimming plate in the high-temperature red-hot state is greatly reduced compared to that at room temperature. The slag skimming plate is quickly eroded by the slag during the slag skimming process. In general, the slag skimming plate needs to be replaced after 2-3 shifts of slag skimming operation, and the service life of the slag skimming plate is short, which increases the cost and workload. Moreover, the slag skimming plate cannot be replaced under high temperature and needs to be replaced after the temperature decreases, which affects the production rhythm of the steel plant. Therefore, we propose a molten iron pretreatment slag skimming device to solve the above problems.

[0004] The slag skimming plate of the slag skimmer can directly skim the slag in the molten steel of the ladle, but since the slag skimming plate is directly in contact with the molten steel and needs to be replaced regularly, a new type of slag skimming plate that is easy to replace and its use method need to be developed. SUMMARY

[0005] 1. Technical problems to be solved by the application

[0006] In view of the defects and deficiencies of the prior art, the present application provides a molten iron pretreatment slag skimming device and method thereof. The present application is characterized in that a heat insulation sleeve is sleeved on the outer surface of the bottom end of the slag skimming plate, which facilitates heat insulation and protection of the bottom end of the slag skimming plate, prevents the bottom end of the slag skimming plate from being directly in contact with the molten iron, and prevents the temperature of the slag skimming plate from rising too high during the operation of the device, thereby affecting the service life of the slag skimming plate. After the slag skimming plate has been in operation for a period of time, the motor is started to drive the threaded plate to move, the insertion rod is retracted, and then the heat insulation sleeve is detached from the slag skimming plate, so as to maintain and replace the heat insulation sleeve. This can effectively improve the service life of the slag skimming plate, reduce the production cost, reduce the replacement time of the slag skimming plate, and improve the production efficiency of the steel plant.

[0007] 2. Technical solutions

[0008] To achieve the above object, the technical scheme provided by the present application is:

[0009] The molten iron pretreatment slagging-off device comprises a connecting arm, one end of the connecting arm is fixedly connected with a supporting plate, a slagging-off plate is mounted on the surface of the supporting plate, the other end of the connecting arm is connected with a driving assembly, the slagging-off plate is driven to move by the driving assembly, and the molten iron is slagged off.

[0010] The bottom end of the slagging-off plate is provided with a heat insulation sleeve, the inside of the slagging-off plate is provided with a fixing cavity, the inside of the fixing cavity is provided with a fixing assembly, and the slagging-off plate is fixed with the heat insulation sleeve through the fixing assembly.

[0011] Further, the upper surface of the heat insulation sleeve is provided with an insertion slot, and the bottom end of the slagging-off plate is inserted into the insertion slot.

[0012] Further, the surface of the slagging-off plate is mounted with a plurality of heat-resistant bolts, and the slagging-off plate is assembled with the supporting plate through the heat-resistant bolts.

[0013] Further, the heat insulation sleeve is composed of a heat-resistant ceramic layer, a refractory castable layer and heat-resistant steel fibers, the heat-resistant steel fibers are filled in the refractory castable layer, and the heat-resistant ceramic layer is arranged on the outer surface of the refractory castable layer.

[0014] Further, the fixing assembly comprises a bidirectional screw rod rotatably mounted in the fixing cavity, a threaded plate is screw-mounted on the rod body of the bidirectional screw rod, the threaded plate is provided with two groups and symmetrically arranged on the two sides of the bidirectional screw rod, and the distal ends of the two groups of threaded plates are fixedly installed with insertion rods; the two side inner walls of the insertion slot are provided with fixing holes, and the insertion rods extend into the fixing holes.

[0015] The middle outer surface of the bidirectional screw rod is fixedly installed with a bevel gear two, the top wall of the fixing cavity is fixedly installed with a motor, the output end of the motor is fixedly installed with an output shaft, the bottom end of the output shaft is fixedly installed with a bevel gear one, and the bevel gear one is engaged with the bevel gear two.

[0016] Further, the bottom wall of the fixing cavity is fixedly installed with two limiting blocks, and the limiting blocks are used for limiting the movement distance of the threaded plate.

[0017] Further, the two side walls of the fixing cavity are provided with communication holes, and the insertion rods pass through the communication holes and extend out of the slagging-off plate.

[0018] The application discloses a method for a molten iron pretreatment slagging device, and the method comprises the following steps: sleeving a heat insulation sleeve on the outer surface of the bottom end of a slagging plate, conveniently performing heat insulation protection on the bottom end of the slagging plate, preventing the bottom end of the slagging plate from directly contacting with the molten iron, preventing the temperature of the slagging plate from being excessively high during the working of the device, and affecting the service life of the slagging plate; when the device works for a period of time, the motor is started to drive the output shaft to rotate, the output shaft drives the bevel gear two to rotate through the bevel gear one, so that the bidirectional screw rod is driven to rotate, when the bidirectional screw rod rotates, the two groups of threaded plates on the rod body move relatively, the threaded plates drive the inserting rod to retract from the fixed cavity of the slagging plate to the fixed cavity of the slagging plate, the heat insulation sleeve can be disassembled from the slagging plate, and the heat insulation sleeve is conveniently maintained and replaced.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:

[0021] The application discloses a method for a molten iron pretreatment slagging device, and the method comprises the following steps: sleeving a heat insulation sleeve on the outer surface of the bottom end of a slagging plate, conveniently performing heat insulation protection on the bottom end of the slagging plate, preventing the bottom end of the slagging plate from directly contacting with the molten iron, preventing the temperature of the slagging plate from being excessively high during the working of the device, and affecting the service life of the slagging plate; when the device works for a period of time, the motor is started to drive the output shaft to rotate, the output shaft drives the bevel gear two to rotate through the bevel gear one, so that the bidirectional screw rod is driven to rotate, when the bidirectional screw rod rotates, the two groups of threaded plates on the rod body move relatively, the threaded plates drive the inserting rod to retract from the fixed cavity of the slagging plate to the fixed cavity of the slagging plate, the heat insulation sleeve can be disassembled from the slagging plate, and the heat insulation sleeve is conveniently maintained and replaced, can effectively improve the service life of the slagging plate, reduces the production cost, reduces the replacement time of the slagging plate, and improves the production efficiency of the steel plant. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The figure is a structural schematic diagram of the application patent;

[0023] Figure 2 The figure is an internal schematic diagram of the heat insulation sleeve of the application patent;

[0024] Figure 3 The figure is an internal structural schematic diagram of the connecting plate of the application patent;

[0025] Figure 4 The figure is a structure schematic diagram of the inner wall material of the heat insulation sleeve of the application patent.

[0026] In the figure: 1, connecting arm; 2, supporting plate; 3, slagging plate; 4, heat-resistant bolt; 5, heat insulation sleeve; 51, heat-resistant ceramic layer; 52, refractory castable layer; 53, heat-resistant steel fiber; 54, insertion groove; 55, fixed hole; 6, fixed cavity; 7, fixed assembly; 71, motor; 72, output shaft; 73, bevel gear one; 74, bidirectional screw rod; 75, threaded plate; 76, inserting rod; 77, bevel gear two; 8, communication hole; 9, limiting block. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with the drawings and examples:

[0028] Example 1

[0029] From Figures 1-4 It can be seen that the molten iron pretreatment slagging device of the embodiment comprises a connecting arm 1, one end of the connecting arm 1 is fixedly connected with a support plate 2, the surface of the support plate 2 is mounted with a slagging plate 3, the surface of the slagging plate 3 is mounted with a plurality of heat-resistant bolts 4, and the slagging plate 3 is assembled with the support plate 2 through the heat-resistant bolts 4; the slagging plate 3 can be disassembled from the support plate 2 by rotating and disassembling the heat-resistant bolts 4, and the slagging plate 3 can be replaced

[0030] The other end of the connecting arm 1 is connected with a driving assembly, the slagging plate 3 is moved by the driving assembly, and the molten iron is slagged;

[0031] The bottom end of the slagging plate 3 is provided with a heat insulation sleeve 5, the heat insulation sleeve 5 insulates and protects the bottom end of the slagging plate 3, prevents the bottom end of the slagging plate 3 from directly contacting the molten iron, and prevents the temperature of the slagging plate 3 from being too high during the working of the device, thereby affecting the service life of the slagging plate 3;

[0032] The upper surface of the heat insulation sleeve 5 is provided with an insertion slot 54, the bottom end of the slagging plate 3 is inserted into the insertion slot 54, the inside of the slagging plate 3 is provided with a fixing cavity 6, the inside of the fixing cavity 6 is provided with a fixing assembly 7, and the slagging plate 3 is fixed with the heat insulation sleeve 5 through the fixing assembly 7.

[0033] The heat insulation sleeve 5 is composed of a heat-resistant ceramic layer 51, a refractory castable layer 52 and a heat-resistant steel fiber 53, the heat-resistant steel fiber 53 is filled in the refractory castable layer 52, and the heat-resistant ceramic layer 51 is arranged on the outer surface of the refractory castable layer 52.

[0034] The heat-resistant steel fiber 53 is used to improve the strength of the refractory castable layer 52, the main components of the refractory castable layer 52 are high alumina clinker, electric smelting mullite, silicon carbide, alpha-Al2O3 micro powder, silicon oxide micro powder, pure calcium aluminate cement and the like, which has good anti-adhesion effect and long service life, and the heat-resistant ceramic layer 51 can further improve the heat insulation and high temperature resistance effect of the heat insulation sleeve 5.

[0035] The fixing assembly 7 comprises a bidirectional screw rod 74 rotatably installed in the fixing cavity 6, a threaded plate 75 threadedly assembled on the rod body of the bidirectional screw rod 74, the threaded plate 75 is provided with two groups and symmetrically arranged on the two sides of the bidirectional screw rod 74, and the distal faces of the two groups of threaded plates 75 are fixedly installed with insertion rods 76; the two side inner walls of the insertion slot 54 are provided with fixing holes 55, and the insertion rods 76 extend into the fixing holes 55;

[0036] The middle outer surface of the bidirectional screw rod 74 is fixedly provided with a bevel gear two 77, the top wall of the fixed cavity 6 is fixedly provided with a motor 71, the output end of the motor 71 is fixedly provided with an output shaft 72, the bottom end of the output shaft 72 is fixedly provided with a bevel gear one 73, and the bevel gear one 73 is engaged with the bevel gear two 77.

[0037] The bottom wall of the fixed cavity 6 is fixedly provided with two limiting blocks 9, the limiting blocks 9 are used for limiting the movement distance of the threaded plates 75, and prevent the insertion rod 76 from being completely separated from the inside of the communication hole 8 and entering the fixed cavity 6, thereby affecting the normal use of the device.

[0038] The two side walls of the fixed cavity 6 are provided with the communication hole 8, and the insertion rod 76 passes through the communication hole 8 and extends to the outside of the slag scraping plate 3.

[0039] The method of the molten iron pretreatment slag scraping device is characterized in that a heat insulation sleeve 5 is sleeved on the bottom end outer surface of the slag scraping plate 3, so that the bottom end of the slag scraping plate 3 is conveniently heat insulated and protected, direct contact of the bottom end of the slag scraping plate 3 with the molten iron is prevented, the temperature of the slag scraping plate 3 is prevented from being too high during the work of the device, and the service life of the slag scraping plate 3 is affected; after the device works for a period of time, the motor 71 is started to drive the threaded plate 75 to move, the insertion rod 76 is retracted from the fixed hole 55 to the fixed cavity 6 of the slag scraping plate 3, the heat insulation sleeve 5 is disassembled from the slag scraping plate 3, the heat insulation sleeve 5 is conveniently maintained and replaced, the service life of the slag scraping plate 3 can be effectively improved, the production cost is reduced, the replacement time of the slag scraping plate is reduced, and the production efficiency of the steel plant is improved.

[0040] The method of the molten iron pretreatment slag scraping device is characterized in that a heat insulation sleeve 5 is sleeved on the bottom end outer surface of the slag scraping plate 3, so that the bottom end of the slag scraping plate 3 is conveniently heat insulated and protected, direct contact of the bottom end of the slag scraping plate 3 with the molten iron is prevented, the temperature of the slag scraping plate 3 is prevented from being too high during the work of the device, and the service life of the slag scraping plate 3 is affected; after the device works for a period of time, the motor 71 is started to drive the threaded plate 75 to move, the insertion rod 76 is retracted from the fixed hole 55 to the fixed cavity 6 of the slag scraping plate 3, the heat insulation sleeve 5 is disassembled from the slag scraping plate 3, the heat insulation sleeve 5 is conveniently maintained and replaced, the service life of the slag scraping plate 3 can be effectively improved, the production cost is reduced, the replacement time of the slag scraping plate 3 is reduced, and the production efficiency of the steel plant is improved.

[0041] The above description of the present application and its embodiments is illustrative and not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A method of slagging of a molten metal pretreatment slagging device, which device comprises a connecting arm (1), characterized in that: One end of the connecting arm (1) is fixedly connected with a support plate (2), the surface of the support plate (2) is mounted with a slag removing plate (3), the other end of the connecting arm (1) is connected with a driving assembly, the slag removing plate (3) is driven to move by the driving assembly, and the molten iron is slagged; The bottom end of the slag removing plate (3) is provided with a heat insulation sleeve (5), the inside of the slag removing plate (3) is provided with a fixed cavity (6), the inside of the fixed cavity (6) is provided with a fixed assembly (7), and the slag removing plate (3) is fixed with the heat insulation sleeve (5) through the fixed assembly (7); The upper surface of the heat insulation sleeve (5) is provided with an insertion slot (54), and the bottom end of the slag removing plate (3) is inserted into the insertion slot (54); The surface of the slag removing plate (3) is mounted with a plurality of heat-resistant bolts (4), and the slag removing plate (3) is assembled with the support plate (2) through the heat-resistant bolts (4); The heat insulation sleeve (5) is composed of a heat-resistant ceramic layer (51), a refractory castable layer (52) and heat-resistant steel fibers (53), the heat-resistant steel fibers (53) are filled in the refractory castable layer (52), and the heat-resistant ceramic layer (51) is arranged on the outer surface of the refractory castable layer (52); The fixed assembly (7) comprises a bidirectional screw rod (74) rotatably installed in the fixed cavity (6), a threaded plate (75) threadedly assembled on the rod body of the bidirectional screw rod (74), two groups of threaded plates (75) symmetrically arranged on the two sides of the bidirectional screw rod (74), and two groups of insertion rods (76) fixedly installed on the faraway sides of the two groups of threaded plates (75); The two side inner walls of the insertion slot (54) are provided with fixed holes (55), and the insertion rods (76) extend into the fixed holes (55); The outer surface of the middle part of the bidirectional screw rod (74) is fixedly installed with a bevel gear two (77), the top wall of the fixed cavity (6) is fixedly installed with a motor (71), the output end of the motor (71) is fixedly installed with an output shaft (72), the bottom end of the output shaft (72) is fixedly installed with a bevel gear one (73), and the bevel gear one (73) is engaged with the bevel gear two (77); The bottom wall of the fixed cavity (6) is fixedly installed with two limiting blocks (9), and the limiting blocks (9) are used for limiting the movement distance of the threaded plate (75); The two side walls of the fixed cavity (6) are provided with communication holes (8), the insertion rods (76) pass through the communication holes (8) and extend to the outside of the slag removing plate (3); Its method for removing slag is: by setting a heat insulation sleeve (5) on the bottom end outer surface of the slag removing plate (3), conveniently heat insulation protection is conducted on the bottom end of the slag removing plate (3), the bottom end of the slag removing plate (3) is prevented from directly contacting with the molten iron, the temperature of the slag removing plate (3) is prevented from being too high during the working of the device, and the service life of the slag removing plate (3) is affected; when the device works for a period of time, the motor (71) is started to drive the output shaft (72) to rotate, the output shaft (72) drives the bevel gear two (77) to rotate through the bevel gear one (73), thereby driving the bidirectional screw rod (74) to rotate, when the bidirectional screw rod (74) rotates, the two groups of threaded plates (75) on the rod body move relatively, the threaded plate (75) drives the inserting rod (76) to retract from the fixed hole (55) to the fixed cavity (6) of the slag removing plate (3), namely the heat insulation sleeve (5) can be disassembled from the slag removing plate (3), conveniently the heat insulation sleeve (5) is maintained and replaced.

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