Device for quickly dismounting blast furnace tuyere bushing

Abstract

The utility model belongs to the technical field of blast furnace smelting, and particularly relates to a device for quickly dismantling a blast furnace tuyere bushing, which comprises a drill rod, a drill bit is arranged at the first end of the drill rod, and a first connecting flange is arranged at the second end of the drill rod; a lower limiting mechanism and an upper limiting mechanism are arranged on the drill rod, the lower limiting mechanism and the upper limiting mechanism are bearings and outer side annular steel plates, bearing inner rings are welded to the drill rod and rotate along with rotation of the drill rod, and bearing outer rings are welded to the annular steel plates; the diameter of the head of the drill bit is larger than the minimum inner diameter of the tuyere bushing but smaller than the minimum outer diameter of the tuyere bushing; the tuyere bushing is quickly dismounted and cleaned through the drill rod, the dismounting mechanism and the cleaning mechanism, and the problems that the blast furnace damping-down time is long and the yield of the blast furnace is affected due to dismounting of the belly pipe are solved; the method improves the dismantling and cleaning efficiency, reduces the labor intensity of workers, and is beneficial to the stability of blast furnace production and the increase of yield.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace smelting, and in particular relates to a device for quickly removing a blast furnace tuyere bushing. Background Art

[0002] To maintain stable regulation of the lower part of the blast furnace, ensure the stability of the tuyere whirlpool area, uniform and reasonable distribution of airflow and temperature, active operation of the hearth, and select the appropriate tuyere area under a certain blast furnace operation system to obtain a certain value of wind speed and blast kinetic energy, so as to keep the blast furnace condition smooth. However, with the changes in market conditions and the actual production situation of enterprises, the blast furnace smelting intensity will also change, and the blast furnace output needs to be able to make flexible adjustments.

[0003] When reducing the blast furnace capacity, in order to increase the kinetic energy of the blast and optimize the distribution of coal gas flow, it is necessary to reduce the tuyere area. There are three ways to reduce the tuyere area: blocking part of the tuyere, replacing a small area tuyere, and adding a refractory bushing to the tuyere. Among them, blocking part of the tuyere can easily cause uneven air volume around the blast furnace, affecting the smooth operation of the furnace; replacing a small area tuyere has a long production and installation cycle and cannot be adjusted quickly. Therefore, most manufacturers currently use the installation of tuyere bushings to achieve the purpose of reducing the tuyere area.

[0004] When the blast furnace capacity needs to be increased, the tuyere bushing is removed to expand the tuyere area. Since the tuyere bushing is a hard refractory material that is resistant to high temperature and wear, and the thickness of the bushing is only 20mm, it is difficult to break the bushing with a steel chisel or other equipment without removing the direct blowpipe. The bushing can only be removed after the direct blowpipe is removed. It takes 80-90 minutes to disassemble and assemble the direct blowpipe, which directly affects the blast furnace downtime and the blast furnace output. In addition, the disassembly and assembly of the direct blowpipe is cumbersome and the labor intensity of the employees is high. Utility Model Content

[0005] The utility model aims to provide a device for quickly removing a blast furnace tuyere liner.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a device for quickly removing a blast furnace tuyere bushing, comprising a drill rod, a drill bit is provided at the first end of the drill rod, and a first connecting flange is provided at the second end of the drill rod; a lower limit mechanism and an upper limit mechanism are provided on the drill rod, the lower limit mechanism and the upper limit mechanism are both a bearing plus an outer annular steel plate, the inner ring of the bearing is welded to the drill rod, the inner ring of the bearing rotates with the rotation of the drill rod, and the outer ring of the bearing is welded to the annular steel plate; the drill bit is a spiral drill bit, the diameter of the drill bit head is larger than the minimum inner diameter of the tuyere bushing, but smaller than its minimum outer diameter; the diameter of the drill bit tail is larger than the maximum inner diameter of the tuyere bushing, but smaller than its maximum outer diameter.

[0007] Specifically, a centering mechanism and a spring are provided between the lower limit mechanism and the upper limit mechanism. The centering mechanism is a hollow cone. The upper and lower outer diameters of the cone are the same as the inner diameter of the straight blowing pipe at the corresponding position. The inner diameter of the cone is 1-2mm larger than the drill rod diameter. The spring is a light-load spring and is only used to support the centering mechanism.

[0008] Specifically, the device for quickly removing the blast furnace tuyere bushing also includes a main shaft box for placing the drill rod, a main shaft sleeve in the main shaft box, and a tooth groove engraved on the outer wall of the main shaft sleeve. The main shaft sleeve is used to move the main shaft and the main shaft sleeve through a first handle with a gear.

[0009] Specifically, a reduction gear is arranged in the main spindle box.

[0010] A method for quickly removing a blast furnace tuyere bushing comprises the following steps:

[0011] 1) Hoist the steel platform with the motor spindle box onto the moving small flat car, extend the drill rod into the straight blow pipe until the drill bit touches the tuyere bushing, push the small flat car to align the second connecting flange in the spindle box with the first connecting flange of the drill rod and connect them with bolts to fix the position of the small flat car;

[0012] 2) Turn on the motor to rotate the spindle and drill rod, turn the handle on the spindle box to move the drill rod until the drill rod cannot move, repeat the operation 3-4 times, stop the motor, release the connection between the drill rod and the spindle box, and take out the drill rod;

[0013] 3) The dismantling device extends into the direct blowing pipe to break the remaining tuyere bushing;

[0014] 4) Use the cleaning device to remove the broken refractory materials and complete the removal and cleaning of the entire tuyere bushing.

[0015] Specifically, the removal device is provided with a first steel plate, a first rod and a second handle. The first steel plate is a rectangular steel plate, the first steel plate is perpendicular to the first rod, the width of the first steel plate is smaller than the inner diameter of the air outlet bushing, and the second handle is also perpendicular to the first rod.

[0016] Specifically, the cleaning device is provided with a second steel plate, a second rod body and a third handle. The second steel plate is a semicircular steel plate, the semicircular diameter is smaller than the minimum outer diameter of the tuyere bushing, the second rod body is perpendicular to the second steel plate, and the third handle is perpendicular to the second rod body.

[0017] The utility model has the following beneficial effects:

[0018] 1) The drill rod, dismantling mechanism and cleaning mechanism are used to quickly dismantle and clean the tuyere bushing, solving the problem of long blast furnace shutdown time and affecting blast furnace output caused by dismantling the direct blowing pipe;

[0019] 2) This method improves the efficiency of dismantling and cleaning, reduces the labor intensity of employees, and is beneficial to the stability of blast furnace production and the increase of output. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the air outlet bushing.

[0021] Figure 2 Schematic diagram of the drill pipe structure.

[0022] Figure 3 This is a schematic diagram of the structure of the spindle box and motor.

[0023] Figure 4 It is a structural diagram of the dismantling mechanism.

[0024] Figure 5 It is a schematic diagram of the structure of the cleaning mechanism.

[0025] Figure 6 for Figure 5 The view from A.

[0026] In the figure: 1-drill bit; 2-lower limit mechanism; 3-centering mechanism; 4-spring; 5-upper limit mechanism; 6-drill rod; 7-first connecting flange; 8-second connecting flange; 9-spindle; 10-spindle sleeve; 11-first handle; 12-spindle box; 13-reduction gear; 14-motor; 15-steel platform; 16-first steel plate; 17-first rod body; 18-second handle; 19-second steel plate; 20-second rod body; 21-third handle; 22-air outlet bushing. DETAILED DESCRIPTION

[0027] The utility model will now be further described in detail with reference to the accompanying drawings.

[0028] like Figure 1-6 , a method for quickly removing the tuyere bushing of a blast furnace, hoisting the steel platform 15 with the motor 14 and the spindle box 12 on a pushable small flat car, extending the entire drill rod 6 into the straight blowing pipe until the drill bit 1 contacts the tuyere bushing 22, pushing the small flat car, aligning the second connecting flange 8 in the spindle box 12 with the first connecting flange 7 of the drill rod 6 and connecting them with bolts, fixing the position of the small flat car so that it cannot move. Turn on the motor 14 to rotate the spindle 9 and the drill rod 6, manually turn the handle on the spindle box 12 to move the drill rod 6 forward, until it contacts the limit and cannot move forward, then withdraw, repeat the operation 3-4 times, stop the motor 14, release the connection between the drill rod 6 and the spindle box 12, and take out the drill rod 6. Use as Figure 4 The manual removal device shown is inserted into the straight blow pipe, and the residual tuyere bushing 22 is completely broken by knocking, rotating and hooking toward the tuyere inlet. Figure 5The manual cleaning device shown in the figure manually removes the broken refractory material completely by scraping it in the direction of the tuyere inlet, thereby completing the removal and cleaning of the entire tuyere bushing 22. The entire work process can be completed within 15 minutes, saving time and effort.

[0029] like Figure 1 As shown, the tuyere bushing 22 is installed in the straight blowing pipe and is made of a refractory material that is resistant to high temperature and wear and has a relatively hard texture. It is in the shape of a hollow truncated cone structure with a wall thickness of about 20 mm.

[0030] like Figure 2 As shown, a device for quickly removing a blast furnace tuyere bushing comprises a drill bit 1, a lower limit mechanism 2, a centering mechanism 3, a spring 4, a lower limit mechanism 5, a drill rod 6, and a connecting flange 7.

[0031] The drill bit 1 is a spiral drill bit 1, the head diameter of the drill bit 1 is larger than the minimum inner diameter of the tuyere bushing 22, but smaller than its minimum outer diameter; the tail diameter of the drill bit 1 is larger than the maximum inner diameter of the tuyere bushing 22, but smaller than its maximum outer diameter. Within the fixed stroke range of the drill bit 1, the drill bit 1 is able to damage the tuyere bushing 22 but does not contact the wall of the direct blowpipe.

[0032] The structure of the lower limit mechanism 5 and the lower limit mechanism 2 is a bearing plus an outer annular steel plate. The inner ring of the bearing is welded to the drill rod 6, and the inner side rotates with the drill rod 6. The outer ring of the bearing is welded to the annular steel plate. The centering mechanism 3 and the spring 4 only contact with the outer ring annular steel plate. After contact, the centering mechanism 3 and the spring 4 do not rotate with the drill rod 6.

[0033] The overall length of the drill rod 6 is 4m. A centering mechanism 3 is set on the drill rod 6 at a distance of 1m from the drill bit. The centering mechanism 3 is in the shape of a hollow cone. The upper and lower outer diameters of the cone are the same as the inner diameter of the straight blow pipe at the corresponding position. The inner diameter of the cone is 1-2mm larger than the diameter of the drill rod. The centering mechanism 3 is pushed to the lower limit mechanism 2 by the action of the spring 4. The centering mechanism 3 does not rotate with the drill rod. When the centering mechanism 3 contacts the lower limit mechanism 2, the head of the drill bit 1 just contacts the air outlet bushing.

[0034] The spring 4 is a light-load spring, which is only used to support the centering mechanism 3 . The compression distance of the spring 4 is the stroke of the drill bit 1 , that is, the distance from the drill bit 1 head contacting the air outlet bushing 22 to the drill bit 1 head drilling out the smallest end of the air outlet bushing 22 .

[0035] The first connecting flange 7 and the second connecting flange 8 of the spindle box have the same diameter and can be connected by bolts.

[0036] like Figure 3 As shown, a device for quickly removing the tuyere bushing of a blast furnace also includes a second connecting flange 8, a main shaft 9, a main shaft sleeve 10, a handle 11, a main shaft box 12, a reduction gear 13, a motor 14, and a steel platform 15.

[0037] The spindle box 12 contains a spindle sleeve 10, the outer wall of which is engraved with tooth grooves. The spindle sleeve 10 realizes the up and down movement of the spindle 9 and the spindle sleeve 10 through a handle 11 with a gear, and the movement stroke is determined by the stroke requirement of the drill bit 1. Its main principle and internal structure are the same as those of a bench drilling machine.

[0038] A reduction gear 13 is arranged in the spindle box 12 to realize three-stage speed change and obtain a greater torque by reducing the motor speed.

[0039] The motor 14 and the spindle box 12 are all mounted and fixed on the steel platform 15. The entire spindle box 12 and the motor 14 have a certain tilt angle, and the tilt angle after the drill rod 6 is installed is the same as the installation angle of the blast furnace direct blowing pipe.

[0040] The steel platform 15 is provided with lifting lugs, and a crane can be used to lift the equipment.

[0041] like Figure 4 As shown, it includes a first steel plate 16 , a first rod body 17 , and a second handle 18 .

[0042] The first steel plate 16 is made of a rectangular steel plate with a thickness of 20 mm, and its width perpendicular to the direction of the first rod body 17 is smaller than the inner diameter of the bushing; the first rod body 17 is made of a steel rod with a diameter of 30 mm and a length of 3.6 m; the second handle 18 is a steel pipe with a diameter of 20 mm.

[0043] like Figure 4 As shown, it includes a second steel plate 19 , a second rod body 20 , and a third handle 21 .

[0044] The second steel plate 19 is made of a semicircular steel plate with a thickness of 20 mm, and the semicircular diameter is smaller than the minimum outer diameter of the air outlet bushing 22; the second rod body 20 is made of a steel rod with a diameter of 30 mm and a length of 4 m; the third handle 21 is a steel pipe with a diameter of 20 mm.

[0045] The existing process of removing the bushing of the direct blowing pipe takes 80-90 minutes, and the labor intensity of removing the direct blowing pipe is high. After adopting the utility model, the bushing of the tuyere can be removed smoothly in 15 minutes, which can greatly reduce the downtime time of the blast furnace process and improve the output of the blast furnace.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for quickly removing a blast furnace tuyere bushing, characterized in that: It comprises a drill rod, a drill bit is arranged at the first end of the drill rod, and a first connecting flange is arranged at the second end of the drill rod; a lower limit mechanism and an upper limit mechanism are arranged on the drill rod, both of which are bearings plus outer annular steel plates, the inner ring of the bearing is welded to the drill rod, the inner ring of the bearing rotates with the rotation of the drill rod, and the outer ring of the bearing is welded to the annular steel plate; the drill bit is a spiral drill bit, the diameter of the drill bit head is larger than the minimum inner diameter of the air outlet bushing, but smaller than its minimum outer diameter; the diameter of the drill bit tail is larger than the maximum inner diameter of the air outlet bushing, but smaller than its maximum outer diameter.

2. A device for quickly removing a blast furnace tuyere bushing according to claim 1, characterized in that: A centering mechanism and a spring are provided between the lower limit mechanism and the upper limit mechanism. The centering mechanism is a hollow cone. The upper and lower outer diameters of the cone are the same as the inner diameter of the straight blow pipe at the corresponding position. The inner diameter of the cone is 1-2mm larger than the drill rod diameter. The spring is a light-load spring and is only used to support the centering mechanism.

3. The device for quickly removing the blast furnace tuyere bushing according to claim 1, characterized in that: The device for quickly removing the blast furnace tuyere bushing also includes a main shaft box for placing the drill rod, a main shaft sleeve is arranged in the main shaft box, and the outer wall of the main shaft sleeve is engraved with tooth grooves. The main shaft sleeve is used to move the main shaft and the main shaft sleeve through a first handle with a gear.

4. A device for quickly removing a blast furnace tuyere bushing according to claim 3, characterized in that: A reduction gear is arranged in the main spindle box.

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