An automatic centering and quick detachable long-life rotary lance

Abstract

The application provides a high-life rotary spray gun with automatic centering and quick dismounting, which comprises a first structure and a second structure. The first structure comprises a first powder spraying pipe, a first thin-walled pipe and a first thick-walled pipe from inside to outside. The first thick-walled pipe comprises a clamping block, the outer wall of the clamping block is provided with a lifting plate, and the upper end is provided with a wedge-shaped hook. The second structure comprises a second powder spraying pipe, a second thin-walled pipe and a second thick-walled pipe from inside to outside. The second structure comprises a flange section, a column section, a stirring section and a spraying section from top to bottom. The outer circumferential surface of the stirring section is provided with a stirring paddle. The first powder spraying pipe and the second powder spraying pipe constitute a same spraying pipe, which penetrates through the first structure and the second structure. The two ends of the spraying pipe are respectively a desulfurizer inlet and a desulfurizer spraying port. The application solves the phenomenon that the rotary spray gun rubs against the upper edge of the hole wall when the rotary spray gun is dismounted or mounted, and the stirring paddle of the rotary spray gun is blocked by the upper edge of the hole wall. The application avoids the falling of the refractory material layer on the outer wall during the operation process, which affects the service life of the rotary spray gun.

Description

Technical Field

[0001] This invention relates to the technical field of desulfurization equipment for molten iron in the metallurgical industry, and more specifically, to a long-life rotary spray gun that can be automatically centered and quickly disassembled. Background Technology

[0002] Hot metal desulfurization is a pretreatment process that removes sulfur from molten iron before it enters the steelmaking furnace for smelting. It can reduce the coke ratio in continuous casting and increase productivity, while also reducing lime consumption and slag production, thereby lowering production costs. It is an indispensable step in modern metallurgical production. Because the desulfurization lance needs to be inserted into the molten iron to inject the desulfurizing agent, the working conditions are extremely harsh, resulting in a short lance lifespan; typically, a single lance needs to be replaced after 10-30 heats.

[0003] Most steel plants use a quick-clamping method for installing / removing desulfurization spray guns. However, due to the characteristics of the desulfurization equipment, the existing spray gun structure, and the lifting method, the current installation / removal methods have many inconsistencies and safety hazards. Taking spray gun removal as an example, when a spray gun needs to be replaced, the spray gun must first be lowered below the secondary platform using the desulfurization unit's lifting system. Then, the lifting point of the desulfurization spray gun is secured by a gantry crane hook. The quick-clamping device is then opened to detach the desulfurization spray gun from the lifting device. After the lifting system is raised, the gantry crane pulls the desulfurization spray gun off the secondary platform and lifts it away. Because the center of the gantry crane hook and the center of the spray gun are offset by approximately 500-1000mm, the spray gun is dragged off the platform by being pressed obliquely against the platform's bore wall. Because the spray gun is heavy (weighing about 1-1.5 tons) and its outer wall is lined with refractory material, the refractory material is easily damaged when it is pulled out, affecting the life of the spray gun. Furthermore, when pulled out at an angle, the spray gun is prone to getting stuck on the upper edge of the hole wall. Therefore, the position of the crane needs to be adjusted frequently, which poses a significant safety hazard to the surrounding personnel.

[0004] In conclusion, improving the shortcomings of the existing structure, resolving safety hazards, and optimizing and improving the current dehydration and desulfurization gun-changing device and its installation / disassembly process have become urgent priorities. Summary of the Invention

[0005] In response to the aforementioned technical problems, a long-life rotary spray gun with automatic centering and quick disassembly / reassembly is provided.

[0006] The technical means employed in this invention are as follows:

[0007] A long-life rotary spray gun with automatic centering and quick disassembly includes: an upper first structure and a lower second structure, wherein the first structure and the second structure are connected by a flange; the first structure is a connecting flange for fixed connection with the flange of the rotary drive device.

[0008] The first structure includes a first powder spray pipe, a first thin-walled circular pipe and a first thick-walled pipe arranged coaxially from the inside to the outside. The first thick-walled pipe includes a clamping block. The outer wall of the clamping block is provided with a lifting plate and the upper end is provided with a wedge-shaped hook. The wedge-shaped hook is used to align with the wedge-shaped hole at the corresponding position of the clamping flange of the rotary drive device and is inserted into the wedge-shaped hole to realize automatic centering of the rotary spray gun and the rotation center of the rotary drive device.

[0009] The second structure is the main body of the rotary spray gun, which includes, from the inside out, a second powder spray pipe, a second thin-walled round pipe and a second thick-walled pipe arranged coaxially in sequence, and from top to bottom, a flange section, a column section, a stirring section and a spray section connected in sequence. The stirring section is provided with a stirring paddle on its lower outer circumference.

[0010] The first powder injection pipe and the second powder injection pipe constitute the same injection pipe, which runs through the first structure and the second structure. The upper and lower ends of the injection pipe are the desulfurizing agent inlet and the desulfurizing agent injection port, respectively.

[0011] Furthermore, the connecting flange also includes 8-12 connecting bolts and 8-12 locating pins evenly distributed along its upper circumference, an upper baffle and a lower baffle. The upper baffle is a flange connecting block located at the lower end of the clamping block, and the lower baffle is located at the upper end of the column section. The upper baffle and the lower baffle are coaxially fixed together by 8-12 connecting bolts and 8-12 locating pins. The locating pins can also be keys to achieve keyed connections.

[0012] Furthermore, the first thick-walled tube is an integral forging; the clamping block is a structure with a lower circle and an upper circle, consisting of an upper square structure and a lower circular structure.

[0013] Furthermore, the lifting plate is in the shape of an inverted trapezoid and is welded to the outer corner of the square structure near the top. The lifting plate has a round hole for lifting the rotating spray gun when disassembling / installing it.

[0014] Furthermore, a frustum-shaped end is welded to the upper end of the square structure. The frustum-shaped end is an integral forging and has an overall flat frustum-shaped structure. The wedge-shaped hook is located on the outer edge of the frustum-shaped structure and is arranged opposite to the lifting plate.

[0015] Furthermore, circular support plates are welded to the upper and lower ends of the inner cavity of the first thick-walled tube, and multiple vent holes are evenly distributed along the circumference on the inner and outer sides of the first thin-walled circular tube on the circular support plates.

[0016] Multiple circular support plates are provided between the inner wall of the second thick-walled tube and the outer wall of the second thin-walled tube, and between the inner wall of the second thin-walled tube and the outer wall of the second powder spraying tube. The circular support plates 18 are welded to the inner and outer sides of the second thin-walled tube, and multiple vent holes are opened on the inner and outer sides of the second thin-walled tube on the circular support plates.

[0017] Furthermore, the outer circumferential surface of the column section is provided with reinforcing ribs evenly distributed along the circumference; the stirring paddle includes multiple stirring blades, which are spirally distributed along the circumference on the outer circumferential surface of the stirring section.

[0018] Furthermore, the outer circumferential surface of the column section, the outer circumferential surface of the stirring paddle, and the outer circumferential surface of the stirring core plate of the stirring paddle are all provided with a refractory material layer, and multiple V-shaped steel bars are welded between the outer circumferential surface of the column section and the refractory material layer, and between the outer circumferential surface of the stirring core plate and the refractory material layer.

[0019] Furthermore, the angle η between the upper surface of the upper layer of the stirring paddle and the horizontal plane satisfies: 0 < η ≤ 30°.

[0020] Furthermore, the radial projection of the stirring paddle is a spiral inverted trapezoid; the forward tilt angle β of the iron-facing surface of the stirring paddle from bottom to top satisfies: 5≤β≤20°, the forward tilt angle γ of the back iron-facing surface from bottom to top satisfies: 0≤γ≤20°, the outward tilt angle α of the side surface from bottom to top satisfies: 2≤α≤4°, and the upward tilt angle of the bottom surface from left to right is 0≤δ≤20°.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The automatic centering and quick-disassembly high-life rotary spray gun provided by this invention solves the problem of the spray gun rubbing against the upper edge of the platform hole wall and the spray gun agitator getting stuck with the upper edge of the hole wall when disassembling / installing the rotary spray gun. At the same time, it avoids the problem of the refractory material layer on the outer layer of the wall falling off during this operation, which affects the life of the spray gun.

[0023] 2. The automatic centering and quick-disassembly long-life rotary spray gun provided by this invention has a simple structure and is easy to disassemble and assemble. It effectively solves the problem of the spray gun rubbing against the nozzle of the second-layer platform during the disassembly and assembly of the spray gun. It can effectively avoid problems such as the bending of the spray gun and the peeling off of the refractory material layer caused by this operation, and solves the safety hazards of disassembling and assembling the rotary spray gun.

[0024] 3. The automatic centering and quick-disassembly high-life rotary spray gun provided by this invention divides the traditional one-piece spray gun into two parts: a flange connection section and an upper and lower stirring and blowing section. The flange connection section requires machining, while the refractory material of the stirring and blowing section needs to be sintered at high temperature. This method can reduce the processing difficulty and improve production efficiency, and effectively avoid the thermal deformation of the connecting flange during high-temperature sintering.

[0025] 4. The automatic centering and quick-disassembly long-life rotary spray gun provided by the present invention is suitable for spraying and stirring high-temperature liquids, and is particularly suitable for molten iron desulfurization devices that drive the spray gun to rotate and spray desulfurizing agent into molten iron through the spray gun.

[0026] Based on the above reasons, this invention can be widely promoted in fields such as molten iron desulfurization in the metallurgical industry. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front view of the rotary stirring spray gun in a specific embodiment of the present invention.

[0029] Figure 2 For the present invention Figure 1 Sectional view of AA.

[0030] Figure 3 For the present invention Figure 2 A sectional view of CC.

[0031] Figure 4 For the present invention Figure 1 A cross-sectional view of BB.

[0032] Figure 5 This is an enlarged view of the hollow tube in this invention.

[0033] Figure 6 For the present invention Figure 1 Detailed sectional view of AA.

[0034] Figure 7 For the present invention Figure 6 Enlarged view of point E in the middle.

[0035] Figure 8 For the present invention Figure 6 Enlarged view of point F in the middle.

[0036] Figure 9 For the present invention Figure 6 A magnified view of point G in the middle.

[0037] Figure 10 For the present invention Figure 6 Sectional view at point DD.

[0038] Figure 11 This is a top view of the present invention.

[0039] In the diagram: 1. Connecting flange; 2. Lifting plate; 3. Connecting bolts; 4. Upper baffle of connecting flange; 5. Lower baffle of connecting flange; 6. Column section; 7. Agitator; 8. Injection section; 9. Desulfurizing agent inlet; 10. Injection pipe; 11. Hollow pipe; 12. Refractory material layer; 13. V-shaped steel bar; 14. Desulfurizing agent injection port; 15. Cooling gas outlet; 16. Positioning pin; 17. Wedge hook; 18. Circular support plate; 19. Vent hole; 20. Frustum-shaped end; 21. Cooling gas inlet; 22. Cooling gas inlet chamber; 23. Cooling gas outlet chamber; 24. Sealing gasket; 25. Lateral vent hole. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0045] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0046] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0047] like Figure 1-11As shown, this invention provides an automatically centered, quickly detachable, and long-life rotary spray gun, suitable for the spraying and stirring of high-temperature liquids, and particularly suitable for molten iron desulfurization devices that use a rotating spray gun to inject desulfurizing agent into molten iron. This invention solves the problems of the spray gun rubbing against the upper edge of the platform hole wall and the spray gun's stirring paddle getting stuck against the upper edge of the hole wall during disassembly / installation of the rotary spray gun. It also avoids the problem of the refractory material layer on the outer wall peeling off during this operation, which would affect the lifespan of the spray gun.

[0048] The traditional one-piece spray gun is divided into two parts: a flange connection section and an upper and lower stirring and blowing section. The flange connection section requires machining, while the refractory material of the stirring and blowing section needs to be sintered at high temperature. This method can reduce the processing difficulty and improve production efficiency, and effectively avoid thermal deformation of the connecting flange during high-temperature sintering.

[0049] The rotary spray gun of the present invention consists of two parts, upper and lower, which are connected by a flange. The connecting flange 1 has 8-12 connecting bolts 3 and 8-12 cylindrical pins (positioning pins 16) evenly distributed along its circumference. These cylindrical pins are used to withstand axial torque, and can also be replaced with a key connection according to design requirements. The connecting flange 1 also includes an upper flange baffle 4 and a lower flange baffle 5. The upper flange baffle 4 is located at the lower end of the upper part (as a flange connecting block located at the lower end of the clamping block), and the lower flange baffle 5 is located at the upper end of the lower part (located at the upper end of the column section 6). The upper flange baffle 4 and the lower flange baffle 5 are coaxially fixed together by 8-12 connecting bolts 3 and 8-12 positioning pins 16.

[0050] The upper part of the rotary spray gun described in this invention is mainly used to fix it to the connecting flange of the existing rotary drive device through a clamping structure. From the inside out, this part consists of a coaxial powder spray pipe, a thin-walled round pipe, a thick-walled pipe, and a frustum-shaped end 20 at the upper end of the thick-walled pipe.

[0051] The thick-walled tube described in this invention is an integral forging, and its shape is divided into two parts from bottom to top: one part is the flange connecting block at the bottom (upper end), and the other part is the clamping block above the lower circle. The circular part of the clamping block mainly bears radial force and bending moment; the square part of the clamping block mainly bears torque.

[0052] Outside the square part of the clamping block described in the text, a lifting plate 2 with an inverted trapezoidal shape is welded at the corner of the square block near the upper end. A round hole is provided on the lifting plate 2 for lifting the rotating spray gun when disassembling / installing it.

[0053] The frustum-shaped end 20 described in the text is welded to the upper end of the square portion of the clamping block. The frustum-shaped end 20 is an integral forging, generally in the shape of a flat frustum. A wedge-shaped hook 17 is designed on the outer side of the frustum, and the wedge-shaped hook 17 is arranged opposite to the lifting plate 2. When installing the rotary spray gun, when the lifting position reaches the vicinity of the clamping block of the rotary drive device clamping flange, the wedge-shaped hook 17 automatically aligns with the wedge-shaped hole at the corresponding position of the clamping flange of the rotary drive device. As the spray gun continues to descend, the wedge-shaped hook 17 automatically inserts into the wedge-shaped hole, thereby automatically centering the rotary spray gun with the rotation center of the rotary drive device.

[0054] The thick-walled tube described in the text has circular support plates 18 welded to its upper and lower ends. Multiple vent holes 19 are evenly distributed along the circumference on the inner and outer sides of the thin-walled tube on the circular support plates 18.

[0055] The lower half of the rotary spray gun described in this invention is the main body of the rotary spray gun; similar to the upper half, it consists of a coaxial powder spray pipe, a thin-walled round pipe, and a thick-walled pipe from the inside out.

[0056] Multiple circular support plates 18 are provided between the inner wall of the thick-walled pipe and the outer wall of the thin-walled circular pipe, and between the inner wall of the thin-walled circular pipe and the outer wall of the powder spray pipe. The circular support plates 18 are welded to the inner and outer sides of the thin-walled circular pipe. Similarly, multiple vent holes 19 are opened on the inner and outer sides of the thin-walled circular pipe on the circular support plates 18.

[0057] The powder injection pipe inside the lower half of the rotary stirring spray gun is the same pipe as the powder injection pipe inside the upper half, namely the injection pipe 10, which runs through both parts. The two ends of the injection pipe 10 are the desulfurizing agent inlet 9 and the desulfurizing agent outlet (desulfurizing agent injection port 14), respectively. The powder injection pipe inside the lower half and the powder injection pipe inside the upper half are sealed by a sealing gasket 24.

[0058] The inner and outer vents 19 of the lower half of the rotary spray gun are connected to the inner and outer vents 19 of the upper half of the rotary spray gun, respectively.

[0059] The adjacent coaxial vent holes 19 on the inner side are connected by pipes. That is, multiple vent holes 19 on the inner side are connected by multiple pipes to form a first pipe, and the interior of the first pipe is a cooling gas inlet chamber 22 (low temperature gas chamber).

[0060] Adjacent vent holes 19 on the outer side are connected by pipes. Multiple vent holes 19 on the outer side are connected by multiple pipe sections to form a second pipe, the interior of which is a cooling gas exhaust chamber 23 (high-temperature gas chamber).

[0061] The inlet end of the cooling gas inlet chamber 22 is the cooling gas inlet 21. The outlet end of the cooling gas outlet chamber 23 is the cooling gas outlet 15, and the cooling gas outlet 15 and the cooling gas inlet 21 are located at the same end.

[0062] The thick-walled tube uses a hollow tube 11. Inside the hollow tube 11, an air circulation pipe is installed (the first pipe and the second pipe are connected near the desulfurizing agent injection port 14 via a transverse vent 25, forming a circulation pipe). Due to the high temperature at the bottom of the spray gun and the injection of the desulfurizing agent, natural air circulation occurs within the circulation pipe; that is, cold air flows downwards from the cavity (cooling gas inlet chamber 22) on the side adjacent to the desulfurizing agent pipe (injection pipe 10 side). Figure 7-9 The downward-pointing arrow indicates the direction of cold air flow (i.e., the direction of downward flow), while hot air flows upward from the cavity (cooling gas exhaust cavity 23) immediately adjacent to the middle tube side (hollow tube 11 side). Figure 7-9 The upward-pointing arrow indicates the direction of upward flow of hot air, thus creating circulation, which in turn cools the intermediate tube and increases the rigidity of the spray gun.

[0063] The main body of the rotary mixing spray gun includes, from top to bottom, a flange section, a column section 6, a mixing section, and a spraying section 8 connected together, with the mixing blade 7 disposed on the outer circumferential surface of the mixing section.

[0064] The rotating stirring spray gun has reinforcing ribs evenly distributed along the circumference on the outer periphery of the column section 6.

[0065] The rotating stirring spray gun, the outer peripheral surface of the column section 6 and the stirring paddle 7, including the stirring core plate and the outer peripheral surface of the stirring core plate, are all covered with a refractory material layer 12, and multiple V-shaped steel bars 13 are welded between the outer peripheral surface of the column section 6 and the refractory material layer 12, and between the outer peripheral surface of the stirring core plate and the refractory material layer 12.

[0066] The rotary stirring spray gun has a stirring section equipped with multiple stirring blades, and the stirring blades are evenly distributed in a spiral shape along the circumference on the outer circumference of the stirring section body.

[0067] The rotating stirring spray gun has an angle η between the upper surface of the upper stirring paddle 7 and the horizontal plane that satisfies: 0 < η ≤ 30°.

[0068] Preferably, in the rotary stirring spray gun, the radial projection of the stirring paddle 7 is a spiral inverted trapezoid; and the forward tilt angle β of the iron-facing surface of the stirring paddle 7 from bottom to top satisfies: 5≤β≤20°, the forward tilt angle γ of the iron-backing surface from bottom to top satisfies: 0≤γ≤20°, the outward tilt angle α of the side surface from bottom to top satisfies: 2≤α≤4°, and the upward tilt angle of the bottom surface from left to right is 0≤δ≤20°.

[0069] This invention has a simple structure and is easy to assemble and disassemble. It effectively solves the problem of the spray gun rubbing against the nozzle of the second-layer platform when assembling and disassembling the spray gun. It can effectively avoid problems such as the bending of the spray gun and the peeling off of the refractory material layer caused by this operation. It also solves the safety hazards of assembling and disassembling the rotating spray gun. It is expected to directly or indirectly increase economic benefits by 1 million yuan per year.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A long-life rotary spray gun with automatic centering and quick disassembly / reassembly, characterized in that, include: The upper first structure and the lower second structure are connected by a flange. The first structure is a connecting flange (1), which is used to be fixedly connected to the flange of the rotary drive device; The first structure includes a first powder spray pipe, a first thin-walled round pipe and a first thick-walled pipe arranged coaxially from the inside to the outside. The first thick-walled pipe includes a clamping block. The outer wall of the clamping block is provided with a lifting plate (2) and the upper end is provided with a wedge hook (17). The wedge hook (17) is used to align with the wedge hole at the corresponding position of the clamping flange of the rotary drive device and is inserted into the wedge hole to realize automatic centering of the rotary spray gun and the rotation center of the rotary drive device. The second structure is the main body of the rotary spray gun, which includes, from the inside out, a second powder spray pipe, a second thin-walled round pipe and a second thick-walled pipe arranged coaxially in sequence, and from top to bottom, a flange section, a column section (6), a stirring section and a spray section (8) connected in sequence. The stirring section is provided with a stirring paddle (7) on its lower outer circumference. The first powder injection pipe and the second powder injection pipe constitute the same injection pipe (10). The injection pipe (10) runs through the first structure and the second structure. The upper and lower ends of the injection pipe (10) are the desulfurizing agent inlet (9) and the desulfurizing agent injection port (14), respectively. The first thick-walled tube is an integral forging; the clamping block is a structure with a lower circle and an upper circle, consisting of an upper square structure and a lower circular structure; The upper end of the square structure is welded with a frustum-shaped end (20), which is an integral forging and has a flat frustum-shaped structure. The wedge-shaped hook (17) is set at the outer edge of the frustum-shaped structure, and the wedge-shaped hook (17) and the lifting plate (2) are arranged opposite to each other. The upper and lower ends of the inner cavity of the first thick-walled tube are welded with circular support plates (18), and multiple ventilation holes (19) are opened on the inner and outer sides of the first thin-walled tube on the circular support plates (18) and evenly distributed along the circumference. Multiple circular support plates (18) are provided between the inner wall of the second thick-walled tube and the outer wall of the second thin-walled tube, and between the inner wall of the second thin-walled tube and the outer wall of the second powder spraying tube. The circular support plates (18) are welded to the inner and outer sides of the second thin-walled tube. Multiple ventilation holes (19) are opened on the inner and outer sides of the second thin-walled tube on the circular support plates (18) and evenly distributed around the circumference. The lifting plate (2) is in the shape of an inverted trapezoid and is welded to the outer corner of the square structure near the top. The lifting plate (2) has a round hole for lifting the rotating spray gun when disassembling / installing it. The outer circumferential surface of the column section (6) is provided with reinforcing ribs evenly distributed along the circumference; the stirring paddle (7) includes multiple stirring blades, which are spirally distributed along the circumference on the outer circumferential surface of the stirring section. The outer periphery of the column section (6), the outer periphery of the stirring paddle (7) and the outer periphery of the stirring core plate of the stirring paddle (7) are all provided with a refractory material layer (12), and multiple V-shaped steel bars (13) are welded between the outer periphery of the column section (6) and the refractory material layer (12) and between the outer periphery of the stirring core plate and the refractory material layer (12).

2. The high-lifespan rotary spray gun with automatic centering and quick disassembly as described in claim 1, characterized in that, The connecting flange (1) also includes 8-12 connecting bolts (3) and 8-12 locating pins (16) evenly distributed along the upper circumference, an upper baffle (4) and a lower baffle (5) of the connecting flange. The upper baffle (4) of the connecting flange is a flange connecting block set at the lower end of the clamping block. The lower baffle (5) of the connecting flange is set at the upper end of the column section (6). The upper baffle (4) and the lower baffle (5) of the connecting flange are coaxially fixed together by 8-12 connecting bolts (3) and 8-12 locating pins (16).

3. The high-lifespan rotary spray gun with automatic centering and quick disassembly as described in claim 1, characterized in that, The angle η between the upper surface of the upper layer of the stirring paddle (7) and the horizontal plane satisfies: 0 < η ≤ 30°.

4. The high-lifespan rotary spray gun with automatic centering and quick disassembly as described in claim 1, characterized in that, The radial projection of the stirring paddle (7) is a spiral inverted trapezoid; the forward tilt angle β of the iron-facing surface of the stirring paddle (7) from bottom to top satisfies: 5≤β≤20°, the forward tilt angle γ of the back iron-facing surface from bottom to top satisfies: 0≤γ≤20°, the outward tilt angle α of the side surface from bottom to top satisfies: 2≤α≤4°, and the upward tilt angle of the bottom surface from left to right is 0≤δ≤20°.

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