CN117385133A - Automatic centering and quick-detachable long-service-life rotary spray gun - Google Patents

Abstract

The invention provides an automatic centering and quick-detachable long-service-life rotary spray gun, which comprises a first structure and a second structure, wherein the first structure comprises a first powder injection pipe, a first thin-wall round pipe and a first thick-wall pipe from inside to outside, the first thick-wall pipe comprises a clamping block, the outer wall of the clamping block is provided with a lifting plate, and the upper end of the clamping block is provided with a wedge-shaped hook; the second structure comprises a second powder injection pipe, a second thin-wall round pipe and a second thick-wall pipe from inside to outside, and comprises a flange section, a column section, a stirring section and an injection section from top to bottom, wherein stirring paddles are arranged on the peripheral surface below the stirring section; the first powder injection pipe and the second powder injection pipe form the same injection pipe, penetrate through the first structure and the second structure, and are respectively provided with a desulfurizing agent inlet and a desulfurizing agent injection port at two ends. The invention solves the problems that when the rotary spray gun is dismounted/mounted, the spray gun wipes and hangs the upper edge of the wall of the platform and the stirring paddle of the spray gun is blocked with the upper edge of the wall of the platform, thereby avoiding the falling of the refractory material layer on the outer layer of the wall in the operation process and affecting the service life of the spray gun.

Description

Automatic centering and quick-detachable long-service-life rotary spray gun

Technical Field

The invention relates to the technical field of molten iron desulfurization equipment in the metallurgical industry, in particular to a high-service-life rotary spray gun capable of being automatically centered and quickly disassembled.

Background

The molten iron desulfurization is a molten iron pretreatment process for removing sulfur from molten iron before the molten iron enters a steelmaking furnace for smelting, can reduce the coke ratio of continuous cast steel, improve the productivity, reduce the lime consumption, slag quantity and the like of steelmaking, thereby reducing the production cost, and being one of the indispensable working procedures of the current metallurgical production process. Because the desulfurizing spray gun needs to be inserted into molten iron when the desulfurizing agent is sprayed into molten iron, the working condition is very bad, the service life of the spray gun is short, and usually one spray gun needs to be replaced when being used in a 10-30 furnace.

Most steel mills desulfurization spray guns are installed/removed in a quick-clamp manner. Due to the characteristics of the desulfurization equipment, the structure of the existing spray gun and the lifting mode, the existing spray gun mounting/dismounting mode has various unchanged and potential safety hazards. Taking the disassembly of the spray gun as an example, when the spray gun needs to be replaced, the spray gun is firstly required to be lowered below the secondary platform through a lifting system of the desulfurization device, then a lifting hook is used for lifting a lifting point of the desulfurization spray gun, then a quick clamping device is opened, after the desulfurization spray gun is separated from the lifting device, the lifting system is lifted, and then the desulfurization spray gun is pulled out of the secondary platform by a crane, and then lifted off. Because the center of the travelling crane lifting hook and the center of the spray gun are offset by about 500-1000mm, when the spray gun is pulled, the spray gun is obliquely pressed on the wall of the platform hole and is pulled out of the platform along the hard direction. Because the spray gun is heavier (weighing about 1-1.5 tons), and the refractory material is paved on the outer wall of the spray gun, the refractory material is easy to damage when pulled out to influence the service life of the spray gun, and the spray gun is easy to be blocked with the upper edge of the hole wall when pulled out obliquely, the crane position needs to be frequently adjusted, and the safety hazard to surrounding personnel is large.

In summary, the defects of the existing structure are overcome, the potential safety hazard is solved, and the optimization and improvement of the existing dehydration desulfurization gun exchange device and the installation/disassembly process are urgent.

Disclosure of Invention

According to the technical problems, the high-service-life rotary spray gun capable of automatically centering and quickly dismounting is provided.

The invention adopts the following technical means:

an automatically centered and fast detachable high life rotary spray gun comprising: the first structure is connected with the second structure through a flange; the first structure is a connecting flange and is fixedly connected with a flange of the rotary driving device;

the first structure comprises a first powder injection pipe, a first thin-wall round pipe and a first thick-wall pipe which are coaxially arranged from inside to outside in sequence, wherein the first thick-wall pipe comprises a clamping block, a lifting plate is arranged on the outer wall of the clamping block, a wedge-shaped hook is arranged at the upper end of the clamping block, and the wedge-shaped hook is used for being aligned with a wedge-shaped hole at the corresponding position of a clamping flange of the rotary driving device and inserted into the wedge-shaped hole, so that the rotary spray gun and the rotary center of the rotary driving device are automatically centered;

the second structure is a main body part of the rotary spray gun, and comprises a second powder spraying and blowing pipe, a second thin-wall round pipe and a second thick-wall pipe which are coaxially arranged in sequence from inside to outside, wherein the second structure comprises a flange section, a column section, a stirring section and a spraying and blowing section which are sequentially connected from top to bottom, and a stirring paddle is arranged on the peripheral surface below the stirring section;

the first powder injection pipe and the second powder injection pipe form the same injection pipe, the injection pipe penetrates through the first structure and the second structure, and the upper end and the lower end of the injection pipe are respectively provided with a desulfurizing agent inlet and a desulfurizing agent injection port.

Further, the connecting flange further comprises 8-12 connecting bolts and 8-12 positioning pins which are uniformly distributed along the circumference, a connecting flange upper end baffle and a connecting flange lower end baffle, the connecting flange upper end baffle is a flange connecting block arranged at the lower end of the clamping block, the connecting flange lower end baffle is arranged at the upper end of the upright column section, the connecting flange upper end baffle and the connecting flange lower end baffle are coaxially fixedly connected through the 8-12 connecting bolts and the 8-12 positioning pins, and the positioning pins can also be keys to realize key connection.

Further, the first thick-walled tube is a unitary forging; the clamping block is of a lower upper structure and consists of an upper square structure and a lower round structure.

Further, the appearance of lifting plate is trapezoidal, welds the position that is close to the upper end in square structure's outside edges and corners department, the round hole has been seted up on the lifting plate for it uses to lift by crane rotatory spray gun when dismantling/installing rotatory spray gun.

Further, the upper end of the square structure is welded with a round table-shaped end head, the round table-shaped end head is an integral forging piece and is in a flat round table-shaped structure, the wedge-shaped hooks are arranged at the outer edge of the round table-shaped structure, and the wedge-shaped hooks and the lifting plate are oppositely arranged.

Further, the upper end and the lower end of the inner cavity of the first thick-wall pipe are welded with round support thin plates, and a plurality of vent holes which are uniformly distributed along the circumference are formed in the inner side and the outer side of the first thin-wall round pipe on the round support thin plates;

a plurality of round support thin plates are arranged between the inner wall of the second thick-wall pipe and the outer wall of the second thin-wall circular pipe and between the inner wall of the second thin-wall circular pipe and the outer wall of the second powder injection pipe, the round support plates 18 are welded on the inner side and the outer side of the second thin-wall circular pipe, and a plurality of vent holes uniformly distributed along the circumference are formed in the inner side and the outer side of the second thin-wall circular pipe on the round support thin plates.

Further, reinforcing rib plates uniformly distributed along the circumference are arranged on the outer circumferential surface of the upright post section; the stirring paddle comprises a plurality of stirring paddles which are spirally and circumferentially uniformly distributed on the outer circumferential surface of the stirring section.

Further, the outer peripheral surface of the upright post section, the outer peripheral surface of the stirring paddle and the outer peripheral surface of the stirring core plate of the stirring paddle are all provided with refractory material layers, and a plurality of V-shaped reinforcing steel bars are welded between the outer peripheral surface of the upright post section and the refractory material layers and between the outer peripheral surface of the stirring core plate and the refractory material layers.

Further, the included angle eta between the upper surface of the upper layer of the stirring paddle and the horizontal plane meets the following conditions: η is more than 0 and less than or equal to 30 degrees.

Further, the radial projection of the stirring paddle is in a spiral inverted trapezoid shape; the front inclination angle beta of the iron facing surface of the stirring paddle from bottom to top meets the following conditions: beta is more than or equal to 5 and less than or equal to 20 degrees, and the front inclination angle gamma of the back iron surface from bottom to top meets the following conditions: gamma is more than or equal to 0 and less than or equal to 20 degrees, and the camber angle alpha of the side surface from bottom to top meets the following conditions: alpha is more than or equal to 2 and less than or equal to 4 degrees, and the upward inclination angle of the bottom surface from left to right is more than or equal to 0 and less than or equal to delta and less than or equal to 20 degrees.

Compared with the prior art, the invention has the following advantages:

1. the high-service-life rotary spray gun capable of being automatically centered and quickly disassembled and assembled solves the problem that when the rotary spray gun is disassembled/assembled, the upper edge of the wall of the platform is wiped and hung by the spray gun, the stirring paddle of the spray gun is blocked with the upper edge of the wall, and meanwhile, the problem that the service life of the spray gun is influenced due to the fact that a refractory material layer on the outer layer of the wall falls off in the operation process is avoided.

2. The high-service-life rotary spray gun capable of being automatically centered and quickly assembled and disassembled is simple in structure and convenient to assemble and disassemble, the problem that the spray gun and the two-layer platform spray gun mouth scratch during assembly and disassembly of the spray gun is effectively solved, the problems of bending of the spray gun, falling of a refractory material layer and the like caused by the operation can be effectively avoided, and the potential safety hazard of assembly and disassembly of the rotary spray gun is solved.

3. The invention provides an automatic centering and quick-detachable long-service-life rotary spray gun, which is characterized in that a traditional integrated spray gun is divided into an upper part and a lower part of a flange connecting section and a stirring and blowing section; the flange connection section needs machining, and the refractory material of the stirring injection section needs high-temperature sintering molding, so that the machining difficulty can be reduced, the production efficiency can be improved, and the thermal deformation of the connection flange during high-temperature sintering can be effectively avoided.

4. The automatic centering and quick-detachable long-service-life rotary spray gun is suitable for spraying and stirring high-temperature liquid, and is particularly suitable for a molten iron desulfurization device which drives the spray gun to rotate and sprays desulfurizing agent into molten iron through the spray gun.

Based on the reasons, the invention can be widely popularized in the fields of molten iron desulfurization and the like in the metallurgical industry.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.

FIG. 1 is a front view of a rotary stirring spray gun in accordance with an embodiment of the present invention.

Figure 2 is a cross-sectional view of A-A of figure 1 in accordance with the present invention.

FIG. 3 is a cross-sectional view of C-C of FIG. 2 in accordance with the present invention.

Fig. 4 is a cross-sectional view of B-B of fig. 1 in accordance with the present invention.

Fig. 5 is an enlarged view of the hollow tube of the present invention.

Fig. 6 is a detailed cross-sectional view of A-A of fig. 1 in accordance with the present invention.

Fig. 7 is an enlarged view of fig. 6 at E in accordance with the present invention.

Fig. 8 is an enlarged view of the invention at F in fig. 6.

Fig. 9 is an enlarged view of the present invention at G in fig. 6.

Fig. 10 is a cross-sectional view of the invention at D-D in fig. 6.

Fig. 11 is a top view of the present invention.

In the figure: 1. a connecting flange; 2. a lifting plate; 3. a connecting bolt; 4. a baffle plate at the upper end of the connecting flange; 5. a baffle plate at the lower end of the connecting flange; 6. a column section; 7. stirring paddles; 8. a blowing section; 9. a desulfurizing agent inlet; 10. a blowing pipe; 11. a hollow tube; 12. a refractory material layer; 13. v-shaped steel bars; 14. desulfurizing agent jetting port; 15. a cooling gas discharge port; 16. a positioning pin; 17. wedge-shaped hooks; 18. a circular support sheet; 19. a vent hole; 20. a truncated cone-shaped end; 21. a cooling gas inlet; 22. a cooling gas inlet chamber; 23. a cooling gas discharge chamber; 24. a sealing backing plate; 25. and a transverse vent.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

As shown in fig. 1-11, the invention provides a high-service-life rotary spray gun capable of automatically centering and quickly dismounting, which is suitable for spraying and stirring high-temperature liquid, in particular to a molten iron desulfurization device for spraying desulfurizing agent into molten iron by driving the spray gun to rotate and spraying desulfurizing agent into molten iron by the spray gun. The invention solves the problems that when the rotary spray gun is dismounted/mounted, the spray gun wipes and hangs the upper edge of the wall of the platform and the stirring paddle of the spray gun is blocked with the upper edge of the wall of the platform, and simultaneously, the problem that the service life of the spray gun is influenced because the refractory material layer on the outer layer of the wall falls off in the operation process is avoided.

The traditional integral spray gun is divided into an upper part and a lower part of a flange connecting section and a stirring and blowing section; the flange connection section needs machining, and the refractory material of the stirring injection section needs high-temperature sintering molding, so that the machining difficulty can be reduced, the production efficiency can be improved, and the thermal deformation of the connection flange during high-temperature sintering can be effectively avoided.

The rotary spray gun consists of an upper part and a lower part which are connected through flanges; 8-12 connecting bolts 3 and 8-12 cylindrical pins (positioning pins 16) are uniformly distributed on the connecting flange 1 along the circumference, and the cylindrical pins are used for bearing axial torque, and can be changed into key connection according to design requirements; the connecting flange 1 further comprises a connecting flange upper end baffle 4 and a connecting flange lower end baffle 5, wherein the connecting flange upper end baffle 4 is arranged at the lower end of the upper part (is a flange connecting block arranged at the lower end of the clamping block), the connecting flange lower end baffle 5 is arranged at the upper end of the lower part (is arranged at the upper end of the upright post section 6), and the connecting flange upper end baffle 4 and the connecting flange lower end baffle 5 are coaxially and fixedly connected through 8-12 connecting bolts 3 and 8-12 positioning pins 16.

The main function of the upper half part of the rotary spray gun is to be fixedly connected with the connecting flange of the existing rotary driving device through the clamping structure. The part is respectively a coaxial powder injection pipe, a thin-wall round pipe, a thick-wall pipe and a round table-shaped end head 20 at the upper end of the thick-wall pipe from inside to outside;

the thick-wall pipe is an integral forging piece, and is divided into two parts from bottom to top in appearance, wherein one part is a flange connecting block (upper end) at the lowest side, and the other part is a clamping block above the lower circle. The circular portion of the clamp block described herein is primarily subjected to radial forces and bending moments; the square part of the clamping block is mainly used for bearing torque;

a lifting plate 2 with an inverted trapezoid shape is welded at the position, close to the upper end, of the edge of the square block at the outer side of the square part of the clamping block, and a round hole is formed in the lifting plate 2 and is used for lifting the rotary spray gun when the rotary spray gun is dismounted/mounted;

the round table-shaped end 20 is welded at the upper end of the square part of the clamping block, the round table-shaped end 20 is a whole forging piece and is in a flat round table shape, a wedge-shaped hook 17 is designed at the outer side of the round table, and the wedge-shaped hook 17 and the lifting plate 2 are oppositely arranged. When the rotary spray gun is installed, when the lifting position reaches the position near the clamping flange clamping block of the rotary driving device, the wedge-shaped hooks 17 are automatically aligned with the wedge-shaped holes at the corresponding positions of the clamping flange of the rotary driving device, and when the spray gun continues to descend, the wedge-shaped hooks 17 are automatically inserted into the wedge-shaped holes, so that the rotary spray gun is automatically aligned with the rotation center of the rotary driving device.

The upper end and the lower end of the inner cavity of the thick-wall pipe are welded with round support thin plates 18, and a plurality of vent holes 19 which are uniformly distributed along the circumference are formed on the inner side and the outer side of the thin-wall round pipe on the round support thin plates 18.

The lower half part of the rotary spray gun is the main body part of the rotary spray gun; the powder injection pipe, the thin-wall round pipe and the thick-wall pipe are coaxial from inside to outside as the upper half part.

A plurality of circular support thin plates 18 are arranged between the inner wall of the thick-wall pipe and the outer wall of the thin-wall pipe and between the inner wall of the thin-wall pipe and the outer wall of the powder injection pipe, the circular support plates 18 are welded on the inner side and the outer side of the thin-wall pipe, and a plurality of vent holes 19 which are uniformly distributed along the circumference are also formed on the inner side and the outer side of the thin-wall pipe on the circular support thin plates 18.

The powder injection pipe in the lower half part and the powder injection pipe in the upper half part of the rotary stirring spray gun are the same pipe, namely an injection pipe 10, and penetrate through the upper part and the lower part, and two ends of the injection pipe 10 are respectively provided with a desulfurizing agent inlet 9 and a desulfurizing agent outlet (a desulfurizing agent injection port 14). And the powder injection pipe in the lower half part and the powder injection pipe in the upper half part are sealed by a sealing backing plate 24.

The inner and outer vent holes 19 of the lower half of the rotary spray gun are respectively communicated with the inner and outer vent holes 19 of the upper half of the rotary spray gun.

Adjacent vent holes 19 on the inner side are communicated with each other through a pipeline. That is, the inside plurality of ventilation holes 19 are connected to each other by a plurality of stages of pipes, and a first pipe is formed inside which a cooling gas inlet chamber 22 (low temperature gas chamber) is formed.

Adjacent vent holes 19 on the outer side and on the same axis are communicated through a pipeline. The plurality of ventilation holes 19 on the outside are connected by a plurality of stages of pipes, and form a second pipe inside which a cooling gas discharge chamber 23 (high temperature gas chamber) is provided.

The inlet end of the cooling gas inlet chamber 22 is a cooling gas inlet 21. The outlet end of the cooling gas discharging chamber 23 is a cooling gas discharging port 15, and the cooling gas discharging port 15 and the cooling gas inlet 21 are located at the same end.

The hollow tube 11 is used as the thick-walled tube. In the inner cavity of the hollow tube 11, an air circulation pipeline (the first pipeline and the second pipeline are communicated through a transverse vent hole 25 at a position close to the desulfurizing agent injection port 14 to form a circulation pipeline), and due to the higher temperature at the bottom of the spray gun and the injection of the desulfurizing agent, natural circulation of air in the circulation pipeline, namely, cold air flows downwards (namely, a downward arrow in fig. 7-9 is shown as a downward flowing direction of the cold air) from a cavity (a cooling gas inlet cavity 22) close to the desulfurizing agent pipeline side (the injection tube 10 side), and hot air flows upwards (namely, an upward arrow in fig. 7-9 is shown as a upward flowing direction of the hot air) from a cavity (a cooling gas outlet cavity 23) close to the intermediate tube side (the hollow tube 11 side), so that circulation is formed, the intermediate tube is cooled, and the rigidity of the spray gun is increased.

The rotary stirring spray gun main body part from top to bottom include flange section, stand section 6, stirring section and jetting section 8 that are connected in proper order, stirring rake 7 set up in the outer peripheral face of stirring section.

The rotary stirring spray gun is characterized in that reinforcing rib plates uniformly distributed along the circumference are arranged on the outer circumferential surface of the upright post section 6.

The rotary stirring spray gun comprises a stirring core plate and a fireproof material layer 12 wrapping the outer peripheral surface of the stirring core plate, wherein a plurality of V-shaped steel bars 13 are welded between the outer peripheral surface of the upright post section 6 and the fireproof material layer 12 and between the outer peripheral surface of the stirring core plate and the fireproof material layer 12.

The rotary stirring spray gun is characterized in that the stirring section is provided with a plurality of stirring paddles, and the stirring paddles are spirally arranged on the outer peripheral surface of the stirring section main body along the circumference.

The included angle eta between the upper surface of the stirring paddle 7 on the upper layer and the horizontal plane of the rotary stirring spray gun is as follows: η is more than 0 and less than or equal to 30 degrees.

Preferably, the radial projection of the stirring paddle 7 of the rotary stirring spray gun is in a spiral inverted trapezoid shape; and the front inclination angle beta of the iron facing surface of the stirring paddle 7 from bottom to top meets the following conditions: beta is more than or equal to 5 and less than or equal to 20 degrees, and the front inclination angle gamma of the back iron surface from bottom to top meets the following conditions: gamma is more than or equal to 0 and less than or equal to 20 degrees, and the camber angle alpha of the side surface from bottom to top meets the following conditions: alpha is more than or equal to 2 and less than or equal to 4 degrees, and the upward inclination angle of the bottom surface from left to right is more than or equal to 0 and less than or equal to delta and less than or equal to 20 degrees.

The invention has simple structure and convenient disassembly and assembly, effectively solves the problem of scraping and rubbing of the spray gun and the nozzle of the two-layer platform during disassembly and assembly of the spray gun, can effectively avoid the problems of bending of the spray gun, falling off of a refractory material layer and the like caused by the operation, solves the potential safety hazard of disassembly and assembly of the rotary spray gun, and can be expected to directly or indirectly improve the economic benefit by 100 ten thousand per year.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. The utility model provides a but self-centering and quick assembly disassembly's rotatory spray gun of high life, its characterized in that includes: the first structure is connected with the second structure through a flange; the first structure is a connecting flange (1) and is fixedly connected with a flange of the rotary driving device;

the first structure comprises a first powder injection pipe, a first thin-walled circular pipe and a first thick-walled pipe which are coaxially arranged from inside to outside in sequence, wherein the first thick-walled pipe comprises a clamping block, a lifting plate (2) is arranged on the outer wall of the clamping block, a wedge-shaped hook (17) is arranged at the upper end of the clamping block, and the wedge-shaped hook (17) is used for being aligned with a wedge-shaped hole at the corresponding position of a clamping flange of the rotary driving device and inserted into the wedge-shaped hole, so that the rotary spray gun and the rotary center of the rotary driving device are automatically centered;

the second structure is a main body part of the rotary spray gun, and comprises a second powder spraying and blowing pipe, a second thin-wall round pipe and a second thick-wall pipe which are coaxially arranged in sequence from inside to outside, wherein the second structure comprises a flange section, a column section (6), a stirring section and a spraying and blowing section (8) which are sequentially connected from top to bottom, and a stirring paddle (7) is arranged on the peripheral surface below the stirring section;

the first powder injection pipe and the second powder injection pipe form the same injection pipe (10), the injection pipe (10) penetrates through the first structure and the second structure, and the upper end and the lower end of the injection pipe (10) are respectively provided with a desulfurizing agent inlet (9) and a desulfurizing agent injection port (14).

2. The automatic centering and quick-detachable high-service-life rotary spray gun according to claim 1, wherein the connecting flange (1) further comprises 8-12 connecting bolts (3) and 8-12 positioning pins (16), a connecting flange upper end baffle (4) and a connecting flange lower end baffle (5) which are uniformly distributed along the circumference, the connecting flange upper end baffle (4) is a flange connecting block arranged at the lower end of the clamping block, the connecting flange lower end baffle (5) is arranged at the upper end of the upright column section (6), the connecting flange upper end baffle (4) and the connecting flange lower end baffle (5) are coaxially fixedly connected through 8-12 connecting bolts (3) and 8-12 positioning pins (16), and the positioning pins (16) can be keys for realizing key connection.

3. The self-centering and quick disconnect high life rotary spray gun of claim 1, wherein said first thick-walled tube is a unitary forging; the clamping block is of a lower upper structure and consists of an upper square structure and a lower round structure.

4. The automatic centering and quick-detachable long-life rotary spray gun according to claim 3, wherein the lifting plate (2) is in an inverted trapezoid shape, and is welded at a position close to the upper end at an outer edge of the square structure, and a round hole is formed in the lifting plate (2) for lifting the rotary spray gun during disassembly/assembly of the rotary spray gun.

5. The automatic centering and quick-detachable long-life rotary spray gun according to claim 3, wherein a round table-shaped end head (20) is welded at the upper end of the square structure, the round table-shaped end head (20) is an integral forging and is of a flat round table-shaped structure as a whole, the wedge-shaped hooks (17) are arranged at the outer edge of the round table-shaped structure, and the wedge-shaped hooks (17) are arranged opposite to the lifting plate (2).

6. The automatic centering and quick-dismantling long-life rotary spray gun according to claim 1, wherein the upper end and the lower end of the inner cavity of the first thick-wall pipe are welded with round support thin plates (18), and a plurality of vent holes (19) which are uniformly distributed along the circumference are formed in the inner side and the outer side of the first thin-wall round pipe on the round support thin plates (18);

a plurality of round support thin plates (18) are arranged between the inner wall of the second thick-wall pipe and the outer wall of the second thin-wall pipe and between the inner wall of the second thin-wall pipe and the outer wall of the second powder injection pipe, the round support plates 18 are welded on the inner side and the outer side of the second thin-wall pipe, and a plurality of vent holes (19) uniformly distributed along the circumference are formed in the inner side and the outer side of the second thin-wall pipe on the round support thin plates (18).

7. The automatic centering and quick-detachable long-life rotary spray gun according to claim 1, wherein reinforcing rib plates uniformly distributed along the circumference are arranged on the outer circumferential surface of the upright post section (6); the stirring paddle (7) comprises a plurality of stirring paddles, and the stirring paddles are spirally and uniformly distributed on the outer circumferential surface of the stirring section along the circumference.

8. The automatic centering and quick detachable high-service-life rotary spray gun according to claim 1, wherein the outer peripheral surface of the upright post section (6), the outer peripheral surface of the stirring paddle (7) and the outer peripheral surface of the stirring core plate of the stirring paddle (7) are all provided with refractory material layers (12), and a plurality of V-shaped steel bars (13) are welded between the outer peripheral surface of the upright post section (6) and the refractory material layers (12) and between the outer peripheral surface of the stirring core plate and the refractory material layers (12).

9. The self-centering and quick-detachable high-life rotary spray gun according to claim 1, wherein the included angle η between the upper surface of the upper layer of the stirring paddle (7) and the horizontal plane is as follows: η is more than 0 and less than or equal to 30 degrees.

10. The self-centering and quick detachable high life rotary spray gun according to claim 1, characterized in that the radial projection of the stirring paddle (7) is a spiral inverted trapezoid; the front inclination angle beta of the iron facing surface of the stirring paddle (7) from bottom to top meets the following conditions: beta is more than or equal to 5 and less than or equal to 20 degrees, and the front inclination angle gamma of the back iron surface from bottom to top meets the following conditions: gamma is more than or equal to 0 and less than or equal to 20 degrees, and the camber angle alpha of the side surface from bottom to top meets the following conditions: alpha is more than or equal to 2 and less than or equal to 4 degrees, and the upward inclination angle of the bottom surface from left to right is more than or equal to 0 and less than or equal to delta and less than or equal to 20 degrees.