A collision-proof and wear-resistant air outlet small sleeve

Abstract

The invention discloses a collision-proof and wear-resistant air outlet small sleeve, comprising a flange, an inner sleeve, an outer sleeve, a deflector, a front protective cap and a plurality of first fixing screws, wherein the outer sleeve is arranged outside the inner sleeve, the rear end of the outer sleeve and the rear end of the inner sleeve are both fixedly connected to the flange, the outer sleeve, the inner sleeve and the flange form an internal cavity, and the deflector is arranged in the internal cavity; the front protective cap is provided with a plurality of first through holes, the front end surface of the outer sleeve is provided with a plurality of first screw holes, the number of the first screw holes and the number of the first fixing screws are the same as the number of the first through holes and correspond one to one; the front protective cap is installed on the front end surface of the outer sleeve, each first fixing screw is in the corresponding first screw hole, the rod of each first fixing screw passes through the corresponding first through hole, the head of each first fixing screw and the front end surface of the outer sleeve jointly lock the front protective cap, and the head of each first fixing screw protrudes to the front side of the front side of the front protective cap. The invention has good wear resistance and impact resistance, and has a long service life.

Description

Technical Field

[0001] The invention relates to cooling equipment for an air supply system of an ironmaking blast furnace, in particular to an anti-collision and wear-resistant air inlet sleeve. Background Art

[0002] The tuyere sleeve of a blast furnace is an important process component for air supply and coal injection in an iron-making blast furnace. The tuyere sleeve can be used to transport hot air of more than 1,000 degrees Celsius into the blast furnace. Most of the existing tuyere sleeves are made of red copper through casting and processing. They are in a high-temperature environment above 1200°C and are always subject to the high-temperature erosion of high-temperature hot air. They are often hit and eroded by molten slag above 1400°C and high-temperature materials in high-speed circulation. The working temperature at the front end of the tuyere sleeve is as high as 1500°C. Due to the impact and erosion of coke particles and furnace materials rotating at high speed in the blast furnace cyclotron area, as well as the shedding of slag skin, the front outer wall and front end of the tuyere sleeve are rapidly worn, and the life of the tuyere sleeve is sharply reduced. When the furnace condition is not smooth or the slag skin falls off, the tuyere sleeve is severely worn. The front end of the tuyere sleeve is severely worn in less than 1 month of use, resulting in damage to the tuyere sleeve and a low service life. Under normal circumstances, the tuyere sleeve should be used for more than 9 months. In order to solve the problem that the front outer wall and the front end of the tuyere sleeve are burned, worn and corroded, resulting in a short service life, both domestic and foreign countries are seeking a wear-resistant and impact-resistant tuyere sleeve, but little progress has been made. Summary of the invention

[0003] The problem to be solved by the present invention is to provide a collision-proof and wear-resistant air vent small sleeve, which has good wear resistance and impact resistance and a long service life.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A collision-proof and wear-resistant air outlet small sleeve, comprising a flange, an inner sleeve, an outer sleeve and a deflector, the outer sleeve is arranged on the outside of the inner sleeve, the rear ends of the outer sleeve and the inner sleeve are fixedly connected to the flange, the outer sleeve, the inner sleeve and the flange surround an internal cavity, and the deflector is arranged in the internal cavity; it is characterized in that: it also includes a front protective cap and a plurality of first fixing screws; the front protective cap is provided with a plurality of first through holes, and the front end surface of the outer sleeve is provided with a plurality of first screw holes, the number of the first screw holes and the number of the first fixing screws are the same as the number of the first through holes and correspond one to one; the front protective cap is installed on the front end surface of the outer sleeve, each first fixing screw is in the corresponding first screw hole, the rod of each first fixing screw passes through the corresponding first through hole, the head of each first fixing screw and the front end surface of the outer sleeve jointly lock the front protective cap, and the head of each first fixing screw protrudes to the front side of the front side of the front protective cap.

[0006] The above-mentioned front protective cap covers the front end of the outer jacket, which plays a further blocking role on the front end of the outer jacket to prevent the furnace charge from directly corroding the front end of the outer jacket when the furnace condition is not smooth or the slag skin falls off; then use multiple first fixing screws to lock the front protective cap on the front end surface of the outer jacket of the tuyere sleeve, and make the head of each first fixing screw protrude to the front side of the front side of the front protective cap. When the slag in the blast furnace falls, the slag first falls on the head of the first fixing screw, which can prevent the front protective cap from being damaged; in addition, when placing the tuyere sleeve, if the front end of the tuyere sleeve is placed downward, the heads of each first fixing screw at the front end of the tuyere sleeve can support the tuyere sleeve to prevent the front end surface of the front protective cap at the front end of the tuyere sleeve from directly contacting the ground and causing damage or friction scratches.

[0007] As a preferred solution of the present invention, an annular groove is provided on the outer side wall of the front part of the jacket, the outer edge of the front protective cap is in the annular groove, and the outer side wall of the outer edge of the front protective cap is flush with the outer side wall of the jacket. The outer edge of the front protective cap is arranged in the annular groove, so that the front protective cap is more closely combined with the jacket, and the structure of the air outlet small cover is kept compact.

[0008] In a specific solution, the inner edge of the front end of the outer sleeve has an annular indentation, the front end face of the annular indentation is located at the rear side of the front end face of the outer sleeve, the front end face of the inner sleeve is located at the rear side of the front end face of the outer sleeve, and the outer side face of the front end of the inner sleeve is connected to the annular indentation through a first annular weld; the front protective cap covers the front end face of the outer sleeve, the first annular weld and the front end face of the inner sleeve. The inner side face of the front protective cap covers the front end face of the inner sleeve, the first annular weld and the front end of the outer sleeve, which further blocks the front end face of the inner sleeve, and prevents the furnace charge from directly eroding the front end face of the inner sleeve when the furnace condition is not smooth or the slag skin falls off.

[0009] As a preferred solution of the present invention, the thickness of the front protective cap is 3-12 mm, preferably 5 mm.

[0010] As a preferred solution of the present invention, a front buffer layer is provided between the front end face of the outer jacket and the rear side face of the front protective cap. Since the front protective cap is relatively hard, the front buffer layer needs to be provided between the front end face of the outer jacket and the rear side face of the front protective cap to eliminate the gap between the front protective cap and the outer jacket, so as to avoid the front protective cap from being broken due to manufacturing errors or impact by materials in the furnace during use.

[0011] The thickness of the front buffer layer is generally 0.5-3 mm; preferably, the thickness of the front buffer layer is generally 1 mm.

[0012] As a further preferred embodiment of the present invention, the front buffer layer is made of a soft heat-resistant material. Usually, the soft heat-resistant material is asbestos cloth or mica board.

[0013] As a preferred embodiment of the present invention, the anti-collision and wear-resistant air outlet small sleeve also includes an outer protective cover and multiple second fixing screws. The outer protective cover is provided with multiple second through holes, and the outer side wall of the front part of the outer jacket is provided with multiple second screw holes. The number of the second screw holes and the number of the second fixing screws are the same as the number of the second through holes and correspond one to one. The outer protective cover is sleeved on the front part of the outer jacket, and each second fixing screw is in the corresponding second screw hole. The rod of each second fixing screw passes through the corresponding second through hole, and the head of each second fixing screw and the outer side wall of the front part of the outer jacket jointly lock the outer protective cover, and the head of each second fixing screw protrudes to the outside of the outer side surface of the outer protective cover. The above-mentioned outer protective cover covers the outer side wall of the front part of the outer jacket, and further blocks the outer side wall of the front part of the outer jacket to prevent the furnace charge from directly corroding the front part of the outer jacket when the furnace condition is not smooth or the slag skin falls off; then use multiple second fixing screws to lock the outer protective cover on the outer side wall of the front part of the outer jacket of the tuyere small sleeve, and make the head of each second fixing screw protrude to the outside of the outer side surface of the outer protective cover. When the slag in the blast furnace falls, the slag first falls on the head of the second fixing screw, which can prevent the outer protective cover from being damaged.

[0014] As a further preferred embodiment of the present invention, an annular groove is provided on the outer side wall of the front part of the outer jacket, the rear end of the outer protective cover is in the annular groove, and the outer side wall of the rear end of the outer protective cover is flush with the outer side wall of the outer jacket. The rear end of the outer protective cover is arranged in the annular groove, so that the outer protective cover is more closely combined with the outer jacket, and the structure of the air outlet small cover is kept compact.

[0015] As a further preferred embodiment of the present invention, the thickness of the outer protective cover is 3-12 mm, preferably 5 mm.

[0016] As a further preferred embodiment of the present invention, the cross-sectional shape of the outer protective cover is an arc. Since the tuyere small sleeve is installed horizontally from front to back, only the top of the outer front wall of the outer jacket may be hit and damaged by the iron slag in the blast furnace, while the bottom of the outer front wall of the outer jacket will not be hit by the iron slag in the blast furnace. Therefore, the outer protective cover is designed to be an arc, and it is only necessary to cover the top of the outer front wall of the outer jacket, which can save the material of the outer protective cover and save production costs.

[0017] In other embodiments, the cross-sectional shape of the outer protective cover may also be annular, and the outer protective cover entirely covers the outer side wall of the front portion of the outer jacket.

[0018] As a further preferred embodiment of the present invention, the outer protective cover is independent of the front protective cap, and the front end face of the outer protective cover is in close contact with the rear end face of the outer edge of the front protective cap. The outer protective cover and the front protective cap are independent of each other (split into two parts), and the outer protective cover and the front protective cap can be processed one by one, making the processing technology relatively simple.

[0019] As a further preferred embodiment of the present invention, an outer buffer layer is provided between the outer side wall of the front portion of the outer jacket and the inner side wall of the outer protective cover. Since the outer protective cover is relatively hard, the outer buffer layer needs to be provided between the outer side wall of the front portion of the outer jacket and the inner side wall of the outer protective cover to eliminate the gap between the outer protective cover and the outer jacket, so as to avoid the outer protective cover from being broken due to manufacturing errors or the impact of the materials in the furnace during use. The thickness of the outer buffer layer is generally 0.5-3mm; preferably, the thickness of the outer buffer layer is generally 1mm.

[0020] As a further preferred embodiment of the present invention, the outer buffer layer is made of a soft heat-resistant material, usually asbestos cloth or mica board.

[0021] As a preferred embodiment of the present invention, the anti-collision and wear-resistant air outlet small sleeve also includes an inner protective sleeve, the inner sleeve front section is sleeved on the inner protective sleeve, and the outer wall of the inner protective sleeve is in close contact with the inner wall of the inner sleeve front section.

[0022] As a further preferred embodiment of the present invention, the thickness of the inner protective sleeve is 3-12 mm, preferably 5 mm.

[0023] In a specific solution, the inner edge of the front end of the outer sleeve has a front covering portion and an annular support portion, the annular support portion is arranged at the rear side of the front covering portion, the annular support portion is located outside the outer side surface of the front end of the inner sleeve, and the inner side surface of the annular support portion is tightly matched with the outer side surface of the front end of the inner sleeve; the front end surface of the inner sleeve is located at the rear side of the rear end surface of the front covering portion, and the front end surface of the inner sleeve is connected to the rear end surface of the front covering portion by a first annular weld, and the inner protective sleeve covers the inner side wall of the front section of the inner sleeve, the first annular weld and the inner side wall of the front section of the outer sleeve. The outer side wall of the inner protective sleeve covers the inner side wall of the front section of the inner sleeve, the first annular weld and the inner side wall of the front section of the outer sleeve together, and further blocks the inner side wall of the front section of the inner sleeve, so as to prevent the furnace charge from directly eroding the front section of the inner sleeve when the furnace condition is not smooth or the slag skin falls off.

[0024] In a specific solution, the front end of the inner protective sleeve is integrally connected to the rear end of the inner side of the front protective cap.

[0025] In another specific embodiment, the inner protective sleeve and the front protective cap are independent of each other.

[0026] As a further preferred embodiment of the present invention, the outer side surface of the front end of the inner protective sleeve is in close contact with the inner side surface of the inner edge of the front protective cap.

[0027] As a further preferred embodiment of the present invention, the front end surface of the inner protective sleeve is in close contact with the rear end surface of the inner edge of the front protective cap.

[0028] As a further preferred embodiment of the present invention, the front end surface of the inner protective sleeve is located at the rear side of the rear end surface of the inner edge of the front protective cap.

[0029] As a further preferred embodiment of the present invention, the front end surface of the inner protective sleeve is flush with the front end surface of the front protective cap.

[0030] As a further preferred embodiment of the present invention, an inner buffer layer is provided between the outer wall of the inner protective sleeve and the inner wall of the inner sleeve front section. Since the inner protective sleeve is relatively hard, the inner buffer layer needs to be provided between the outer wall of the inner protective sleeve and the inner wall of the inner sleeve front section to eliminate the gap between the inner protective sleeve and the inner sleeve, so as to avoid the inner protective sleeve from being broken due to manufacturing errors or the impact of materials in the furnace during use.

[0031] As a further preferred embodiment of the present invention, the inner buffer layer is made of a soft material. Usually, the soft material is asbestos cloth or mica board. The thickness of the inner buffer layer is generally 0.5-3 mm; preferably, the thickness of the inner buffer layer is generally 1 mm.

[0032] As a further preferred embodiment of the present invention, the front protective cap, outer protective cover and inner protective cover are made of ceramic or wear-resistant metal. Usually, the front protective cap, outer protective cover and inner protective cover made of ceramic material can be made by vibrating casting with castable material, or by firing with sintered material. The wear-resistant metal can be made of wear-resistant white cast iron, high manganese steel or ductile iron, and the front protective cap, outer protective cover and inner protective cover are made by casting. The wear-resistant white cast iron is KmTBCr15Mo; the high manganese steel is ZGMn13-2; the ductile iron is QT900-2.

[0033] In a specific solution, the rear end of the outer sleeve is connected to the front end of the flange through a second annular weld, and the rear end of the inner sleeve is connected to the front end of the flange through a third annular weld.

[0034] In another specific solution, the rear end of the outer sleeve is connected to the front end of the flange through a second annular weld, and the rear end of the inner sleeve is integrally connected to the front end of the flange.

[0035] Usually, the outer sleeve is made of copper or copper alloy; the flange and inner sleeve are made of copper, copper alloy or steel.

[0036] Usually, a water inlet and a water outlet are generally provided on the flange, and the deflector divides the internal cavity surrounded by the outer sleeve, the inner sleeve and the flange to form a water cooling channel.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] This anti-collision and wear-resistant air outlet small sleeve can reinforce the front protective cap by locking with each first fixing screw, and prevent the front protective cap from being damaged or scratched by collision or friction. It has good wear resistance and impact resistance and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0040] Figure 2 is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0041] Figure 3 is a schematic structural diagram of an outer protective cover in Embodiment 2 of the present invention;

[0042] Figure 4 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0043] Figure 5 is a schematic structural diagram of the inner protective sleeve in Embodiment 3 of the present invention;

[0044] Figure 6 It is a structural schematic diagram of a tuyere sleeve in Embodiment 4 and Embodiment 7 of the present invention;

[0045] Figure 7 It is a structural schematic diagram of another tuyere sleeve in Embodiment 4 and Embodiment 7 of the present invention;

[0046] Figure 8 is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0047] Fig. 9 is a schematic diagram of the structure of Embodiment 6 of the present invention;

[0048] Fig.10 is a schematic structural diagram of Embodiment 8 of the present invention;

[0049] Fig.11 This is a schematic diagram of the structure of a tuyere sleeve in Embodiment 9 of the present invention;

[0050] Fig.12 It is a structural schematic diagram of another tuyere sleeve in Example 9 of the present invention. DETAILED DESCRIPTION

[0051] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Example 1

[0053] like Figure 1As shown, the anti-collision and wear-resistant air outlet small sleeve in this embodiment includes a flange 1, an inner sleeve 2, an outer sleeve 3, a deflector 4, a front protective cap 5 and a plurality of first fixing screws 6. The outer sleeve 3 is sleeved on the outside of the inner sleeve 2, and the rear ends of the outer sleeve 3 and the inner sleeve 2 are fixedly connected to the flange 1. The outer sleeve 3, the inner sleeve 2 and the flange 1 form an internal cavity 7, and the deflector 4 is arranged in the internal cavity 7; a plurality of first through holes 51 are provided on the front protective cap 5, and a plurality of first screw holes 32 are provided on the front end surface 31 of the outer sleeve 3. The number of the first screw holes 32 and the number of the first fixing screws 6 are the same as the number of the first through holes 51 and correspond one to one; the front protective cap 5 is installed on the front end surface 31 of the outer sleeve 3, and each first fixing screw 6 is in the corresponding first screw hole 32. The rod of each first fixing screw 6 passes through the corresponding first through hole 51, and the head 61 of each first fixing screw 6 and the front end surface 31 of the outer sleeve 3 jointly lock the front protective cap 5, and the head 61 of each first fixing screw 6 protrudes to the front side of the front side of the front protective cap 5.

[0054] The above-mentioned front protective cap 5 covers the front end surface 31 of the outer sleeve 3, and further blocks the front end of the outer sleeve 3 to prevent the furnace charge from directly corroding the front end of the outer sleeve 3 when the furnace condition is not smooth or the slag skin falls off; then use multiple first fixing screws 6 to lock the front protective cap 5 on the front end surface 31 of the outer sleeve 3 of the tuyere small sleeve, and make the head 61 of each first fixing screw 6 protrude to the front side of the front side of the front protective cap 5. When the slag in the blast furnace falls, the slag first falls on the head 61 of the first fixing screw 6, which can prevent the front protective cap 5 from being damaged; in addition, when placing the tuyere small sleeve, if the front end of the tuyere small sleeve is placed downward, the head 61 of each first fixing screw 6 at the front end of the tuyere small sleeve can support the tuyere small sleeve, and prevent the front end surface 31 of the front protective cap 5 at the front end of the tuyere small sleeve from directly contacting the ground and causing damage or friction scratches.

[0055] An annular groove 33 is provided on the outer side wall of the front portion of the outer jacket 3, and the outer edge of the front protective cap 5 is in the annular groove 33, and the outer side wall of the outer edge of the front protective cap 5 is flush with the outer side wall of the outer jacket 3. The outer edge of the front protective cap 5 is arranged in the annular groove 33, so that the front protective cap 5 is more closely combined with the outer jacket 3, and the structure of the air outlet small sleeve is kept compact.

[0056] The inner edge of the front end of the outer sleeve 3 has an annular indentation 34, the front end face of the annular indentation 34 is located at the rear side of the front end face 31 of the outer sleeve 3, the front end face of the inner sleeve 2 is located at the rear side of the front end face 31 of the outer sleeve 3, and the outer side face of the front end of the inner sleeve 2 is connected to the annular indentation 34 through the first annular weld 8; the front protective cap 5 covers the front end face 31 of the outer sleeve 3, the first annular weld 8 and the front end face of the inner sleeve 2. The inner side face of the front protective cap 5 covers the front end face of the inner sleeve 2, the first annular weld 8 and the front end of the outer sleeve 3, and further blocks the front end face of the inner sleeve 2, so as to prevent the furnace charge from directly eroding the front end face of the inner sleeve 2 when the furnace condition is not smooth or the slag skin falls off.

[0057] The thickness of the front protective cap is 5mm.

[0058] The material of the front protective cap 5 is ceramic. Usually, the front protective cap 5 made of the ceramic material can be formed by vibrating casting with a casting material, or by firing with a sintering material.

[0059] A front buffer layer 9 is provided between the front end face 31 of the outer jacket 3 and the rear side face of the front protective cap 5, and the material of the front buffer layer 9 is a soft heat-resistant material. Since the front protective cap 5 is relatively hard, the front buffer layer 9 needs to be provided between the front end face 31 of the outer jacket 3 and the rear side face of the front protective cap 5 to eliminate the gap between the front protective cap 5 and the outer jacket 3, so as to avoid the front protective cap 5 from being broken due to manufacturing errors or the impact of the materials in the furnace during use. The thickness of the front buffer layer 9 is generally 1 mm. Usually, the soft heat-resistant material is asbestos cloth or mica board.

[0060] The rear end of the outer sleeve 3 is connected to the front end of the flange 1 through a second annular weld 10 , and the rear end of the inner sleeve 2 is connected to the front end of the flange 1 through a third annular weld 11 .

[0061] Usually, the outer sleeve 3 is made of copper; the flange 1 and the inner sleeve 2 are both made of steel.

[0062] Typically, a water inlet 101 and a water outlet (not shown) are generally provided on the flange 1 , and the deflector 4 divides the internal cavity 7 surrounded by the outer sleeve 3 , the inner sleeve 2 and the flange 1 to form a water cooling channel.

[0063] Example 2

[0064] like Figure 2-3 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 1 is as follows:

[0065] This anti-collision and wear-resistant air outlet small sleeve also includes an outer protective cover 12 and a plurality of second fixing screws 13. The outer protective cover 12 is provided with a plurality of second through holes 121, and the outer side wall of the front part of the outer jacket 3 is provided with a plurality of second screw holes 35. The number of the second screw holes 35 and the number of the second fixing screws 13 are the same as the number of the second through holes 121 and correspond one to one; the outer protective cover 12 is sleeved on the front part of the outer jacket 3, and each second fixing screw 13 is in the corresponding second screw hole 35. The rod of each second fixing screw 13 passes through the corresponding second through hole 121, and the head 131 of each second fixing screw 13 and the outer side wall of the front part of the outer jacket 3 jointly lock the outer protective cover 12, and the head 131 of each second fixing screw 13 protrudes to the outside of the outer side surface of the outer protective cover 12; the cross-sectional shape of the outer protective cover 12 is arc-shaped. The above-mentioned outer protective cover 12 covers the outer side wall of the front part of the outer jacket 3, and further blocks the outer side wall of the front part of the outer jacket 3 to prevent the furnace charge from directly corroding the front part of the outer jacket 3 when the furnace condition is not smooth or the slag skin falls off; then use multiple second fixing screws 13 to lock the outer protective cover 12 on the outer side wall of the front part of the outer jacket 3 of the tuyere sleeve, and make the head 131 of each second fixing screw 13 protrude to the outside of the outer side surface of the outer protective cover 12. When the slag in the blast furnace falls, the slag first falls on the head 131 of the second fixing screw 13, which can prevent the outer protective cover 12 from being damaged.

[0066] An annular groove 33 is provided on the outer side wall of the front portion of the outer sleeve 3 , the rear end of the outer protective cover 12 is located in the annular groove 33 , and the outer side wall of the rear end of the outer protective cover 12 is flush with the outer side wall of the outer sleeve 3 .

[0067] The outer protective cover 12 is independent of the front protective cap 5, and the front end surface of the outer protective cover 12 is in close contact with the rear end surface of the outer edge of the front protective cap 5. The outer protective cover 12 and the front protective cap 5 are independent of each other (split), and the outer protective cover 12 and the front protective cap 5 can be processed one by one, making the processing technology relatively simple.

[0068] The thickness of the outer protective cover 12 is 5 mm. The material of the outer protective cover 12 is ceramic. Generally, the outer protective cover 12 of the ceramic material can be formed by vibrating casting with a casting material, or by firing with a sintering material.

[0069] An outer buffer layer 14 is provided between the outer side wall of the front part of the outer jacket 3 and the inner side wall of the outer protective cover 12, and the material of the outer buffer layer 14 is a soft heat-resistant material. Since the outer protective cover 12 is relatively hard, the outer buffer layer 14 needs to be provided between the outer side wall of the front part of the outer jacket 3 and the inner side wall of the outer protective cover 12 to eliminate the gap between the outer protective cover 12 and the outer jacket 3, so as to avoid the outer protective cover 12 from being broken due to manufacturing errors or the impact of the materials in the furnace during use. The thickness of the outer buffer layer 14 is generally 1 mm. Usually, the soft heat-resistant material is asbestos cloth or mica board.

[0070] Example 3

[0071] like Figure 4-5 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 1 is as follows:

[0072] This anti-collision and wear-resistant air vent small sleeve also includes an inner protective sleeve 15, and the front section of the inner sleeve 2 is sleeved on the inner protective sleeve 15, and the outer wall of the inner protective sleeve 15 is in close contact with the inner wall of the front section of the inner sleeve 2. An inner buffer layer 16 is provided between the outer wall of the inner protective sleeve 15 and the inner wall of the front section of the inner sleeve 2, and the material of the inner buffer layer 16 is a soft material. Since the above-mentioned inner protective sleeve 15 is relatively hard, it is necessary to set the inner buffer layer 16 between the outer wall of the inner protective sleeve 15 and the inner wall of the front section of the inner sleeve 2 to eliminate the gap between the inner protective sleeve 15 and the inner sleeve 2, so as to avoid the inner protective sleeve 15 from being broken due to manufacturing errors or the impact of materials in the furnace during use. Usually, the above-mentioned soft material is asbestos cloth or mica board. The thickness of the above-mentioned inner buffer layer 16 is generally 1 mm. The material of the inner protective sleeve 15 is ceramic. The thickness of the inner protective sleeve 15 is 5 mm.

[0073] The inner protective sleeve 15 and the front protective cap 5 are independent of each other; the outer side surface of the front end of the inner protective sleeve 15 is in close contact with the inner side surface of the inner edge of the front protective cap 5 .

[0074] Example 4

[0075] like Figure 6-7 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 3 is as follows:

[0076] The inner edge of the front end of the outer sleeve 3 has a front covering portion 36 and an annular support portion 37. The annular support portion 37 is arranged at the rear side of the front covering portion 36. The annular support portion 37 is located outside the outer side of the front end of the inner sleeve 2. The inner side of the annular support portion 37 is tightly matched with the outer side of the front end of the inner sleeve 2. The front end face of the inner sleeve 2 is located behind the rear end face of the front covering portion 36. The front end face of the inner sleeve 2 is connected to the rear end face of the front covering portion 36 by a first annular weld 8. The inner protective sleeve 15 covers the inner side wall of the front section of the inner sleeve 2, the first annular weld 8 and the inner side wall of the front part of the outer sleeve 3. The outer side wall of the inner protective sleeve 15 covers the inner side wall of the front section of the inner sleeve 2, the first annular weld 8 and the inner side wall of the front part of the outer sleeve 3 together, and further blocks the inner side wall of the front section of the inner sleeve 2, so as to prevent the furnace charge from directly corroding the front section of the inner sleeve 2 when the furnace condition is not smooth or the slag skin falls off.

[0077] Example 5

[0078] like Figure 8 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 3 is as follows:

[0079] The front end surface of the inner protective sleeve 15 is in close contact with the rear end surface of the inner edge of the front protective cap 5 .

[0080] Example 6

[0081] like Fig. 9 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 3 is as follows:

[0082] The front end surface of the inner protective sleeve 15 is located at the rear side of the rear end surface of the inner side edge of the front protective cap 5 .

[0083] Example 7

[0084] like Figure 6-7 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 3 is as follows:

[0085] The front end surface of the inner protective sleeve 15 is flush with the front end surface of the front protective cap 5 .

[0086] Example 8

[0087] like Fig.10 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 3 is as follows:

[0088] The front end of the inner protective sleeve 15 is integrally connected to the rear end of the inner side of the front protective cap 5 .

[0089] Example 9

[0090] like Figure 7 , Fig.11 , Fig.12 As shown, the difference between the anti-collision and wear-resistant air outlet small sleeve in this embodiment and that in embodiment 1 is as follows:

[0091] This anti-collision and wear-resistant air outlet small sleeve also includes an outer protective cover 12 and a plurality of second fixing screws 13. The outer protective cover 12 is provided with a plurality of second through holes 121, and the outer side wall of the front part of the outer jacket 3 is provided with a plurality of second screw holes 35. The number of the second screw holes 35 and the number of the second fixing screws 13 are the same as the number of the second through holes 121 and correspond one to one; the outer protective cover 12 is sleeved on the front part of the outer jacket 3, and each second fixing screw 13 is in the corresponding second screw hole 35. The rod of each second fixing screw 13 passes through the corresponding second through hole 121. The head of each second fixing screw 13 and the outer side wall of the front part of the outer jacket 3 jointly lock the outer protective cover 12, and the head of each second fixing screw 13 protrudes to the outside of the outer side surface of the outer protective cover 12; the cross-sectional shape of the outer protective cover 12 is arc-shaped; an outer buffer layer 14 is provided between the outer side wall of the front part of the outer jacket 3 and the inner side wall of the outer protective cover 12. The above-mentioned outer protective cover 12 covers the outer side wall of the front part of the outer jacket 3, and further blocks the outer side wall of the front part of the outer jacket 3 to prevent the furnace charge from directly corroding the front part of the outer jacket 3 when the furnace condition is not smooth or the slag skin falls off; then use multiple second fixing screws 13 to lock the outer protective cover 12 on the outer side wall of the front part of the outer jacket 3 of the tuyere sleeve, and make the head of each second fixing screw 13 protrude to the outside of the outer side surface of the outer protective cover 12. When the slag in the blast furnace falls, the slag first falls on the head of the second fixing screw 13, which can prevent the outer protective cover 12 from being damaged.

[0092] The anti-collision and wear-resistant air outlet small sleeve also includes an inner protective sleeve 15, the front section of the inner sleeve 2 is sleeved on the inner protective sleeve 15, and the outer wall of the inner protective sleeve 15 is in close contact with the inner wall of the front section of the inner sleeve 2. An inner buffer layer 16 is provided between the outer wall of the inner protective sleeve 15 and the inner wall of the front section of the inner sleeve 2.

[0093] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A collision-proof and wear-resistant air outlet small sleeve, comprising a flange, an inner sleeve, an outer sleeve and a deflector, wherein the outer sleeve is arranged outside the inner sleeve, the rear end of the outer sleeve and the rear end of the inner sleeve are fixedly connected to the flange, the outer sleeve, the inner sleeve and the flange enclose an internal cavity, and the deflector is arranged in the internal cavity; characterized in that: It also includes a front protective cap and a plurality of first fixing screws; a plurality of first through holes are provided on the front protective cap, and a plurality of first screw holes are provided on the front end surface of the outer sleeve, the number of the first screw holes and the number of the first fixing screws are the same as the number of the first through holes and correspond one to one; the front protective cap is installed on the front end surface of the outer sleeve, and each first fixing screw is in the corresponding first screw hole, and the rod of each first fixing screw passes through the corresponding first through hole, and the head of each first fixing screw and the front end surface of the outer sleeve jointly lock the front protective cap, and the head of each first fixing screw protrudes to the front side of the front side of the front protective cap; a front buffer layer is provided between the front end surface of the outer sleeve and the rear side of the front protective cap.

2. The anti-collision and wear-resistant air vent small sleeve according to claim 1 is characterized in that: An annular groove is arranged on the outer side wall of the front part of the outer jacket, the outer edge of the front protective cap is in the annular groove, and the outer side wall of the outer edge of the front protective cap is flush with the outer side wall of the outer jacket.

3. The anti-collision and wear-resistant air vent small sleeve according to claim 1 is characterized in that: The thickness of the front protective cap is 3-12 mm; The material of the front buffer layer is a soft heat-resistant material; The thickness of the front buffer layer is 0.5-3 mm; The material of the front protective cap is ceramic or wear-resistant metal.

4. The anti-collision and wear-resistant air vent small sleeve according to claim 1 is characterized in that: The outer protective cover is provided with a plurality of second through holes, and the outer side wall of the front part of the outer jacket is provided with a plurality of second screw holes, the number of the second screw holes and the number of the second fixing screws are the same as the number of the second through holes and correspond one to one; the outer protective cover is sleeved on the front part of the outer jacket, and each second fixing screw is in the corresponding second screw hole, and the rod of each second fixing screw passes through the corresponding second through hole, and the head of each second fixing screw and the outer side wall of the front part of the outer jacket jointly lock the outer protective cover, and the head of each second fixing screw protrudes to the outside of the outer side surface of the outer protective cover.

5. The anti-collision and wear-resistant air vent small sleeve according to claim 4 is characterized in that: An annular groove is provided on the outer side wall of the front part of the outer jacket, the rear end of the outer protective cover is located in the annular groove, and the outer side wall of the rear end of the outer protective cover is flush with the outer side wall of the outer jacket; The thickness of the outer protective cover is 3-12 mm; The cross-sectional shape of the outer protective cover is an arc; The outer protective cover and the front protective cap are independent of each other, and the front end surface of the outer protective cover is in close contact with the rear end surface of the outer edge of the front protective cap.

6. The anti-collision and wear-resistant air vent small sleeve according to claim 4 is characterized in that: An outer buffer layer is provided between the outer side wall of the front part of the outer jacket and the inner side wall of the outer protective cover; the material of the outer buffer layer is a soft heat-resistant material; the thickness of the outer buffer layer is 0.5-3mm; the material of the outer protective cover is ceramic or wear-resistant metal.

7. The anti-collision and wear-resistant air vent small sleeve according to claim 1 or 4, characterized in that: It also includes an inner protective sleeve, wherein the inner sleeve front section is sleeved on the inner protective sleeve, and the outer side wall of the inner protective sleeve is in close contact with the inner side wall of the inner sleeve front section.

8. The anti-collision and wear-resistant air vent small sleeve according to claim 7, characterized in that: The front end of the inner protective sleeve is integrally connected with the rear end inside the front protective cap.

9. The anti-collision and wear-resistant air vent small sleeve according to claim 7, characterized in that: The thickness of the inner protective sleeve is 3-12 mm; The inner protective sleeve and the front protective cap are independent of each other; The outer side surface of the front end of the inner protective sleeve is in close contact with the inner side surface of the inner edge of the front protective cap; or the front end surface of the inner protective sleeve is in close contact with the rear end surface of the inner edge of the front protective cap; or the front end surface of the inner protective sleeve is at the rear side of the rear end surface of the inner edge of the front protective cap; or the front end surface of the inner protective sleeve is flush with the front end surface of the front protective cap.

10. The anti-collision and wear-resistant air vent small sleeve according to claim 7, characterized in that: An inner buffer layer is provided between the outer wall of the inner protective sleeve and the inner wall of the inner sleeve front section; the material of the inner buffer layer is a soft material; the thickness of the inner buffer layer is 0.5-3mm; the material of the inner protective sleeve is ceramic or wear-resistant metal.

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