Pipeline inner wall anti-corrosion powder spraying system

Abstract

The invention discloses a pipeline inner wall anti-corrosion powder spraying system, and relates to the technical field of pipeline inner wall spraying. The pipeline inner wall anti-corrosion powder spraying system comprises a powder storage tank, a powder amount control valve, a worm quantitative conveying device, a first driving mechanism, an adjustable-speed motor, a Venturi powder ejector, an adjustable air source conveying mechanism, a powder spraying gun pipe and a self-rotating type powder diffusion spraying head. The powder storage tank is connected with the worm quantitative conveying device; the worm quantitative conveying device is connected with the venturi powder ejector, the venturi powder ejector is connected with the input end of the powder spray gun pipe, and the self-rotating powder diffusion spray head is installed on the powder spray gun pipe through the rotating connector. The self-rotating type powder diffusion spray head comprises a spray head body, a plurality of self-rotating type blades and a plurality of auxiliary diffusion blades. According to the spraying device, anti-corrosion powder in the powder storage tank can act on the surface of the inner wall of the pipeline in a uniform diffusion mode, the overall spraying quality of the inner wall of the pipeline is improved, and meanwhile the spraying efficiency of the anti-corrosion powder on the inner wall of the pipeline is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline inner wall spraying, and in particular to a pipeline inner wall anti-corrosion powder spraying system. Background Art

[0002] Hot-melt powder coatings are widely used in the anti-corrosion treatment of special oil pipelines. They have good insulation, anti-corrosion and anti-waxing properties. Since China introduced the internal anti-corrosion technology of special oil pipelines in the 1990s, all kinds of drill pipes and oil casings are treated with anti-corrosion internal coatings before use. In order to ensure the continuity of the anti-corrosion coating, all kinds of short-section drill pipes and oil casing couplings need to be sprayed with anti-corrosion. At present, when the industry handles the powder spraying operation on the inner wall of this type of annular pipe fittings, the spraying equipment is mostly long-pole spray guns. During the spraying process, the operator uses a handheld long-pole spray gun to spray the inner wall of the pipe. However, the manual handheld spray gun is used for spraying, which is easy to cause uneven spraying of the paint during the spraying process, reducing the anti-corrosion treatment effect on the outer wall of the pipe. The handheld long pole uses a traditional powder spray head inserted into the inner cavity of the pipe, and the paint is sprayed on the inner wall of the pipe through multiple spray holes opened on the spray head. However, the spraying efficiency of the spray head of this equipment is low, and the spraying uniformity is relatively poor, resulting in different thicknesses of the powder sprayed on the inner wall of the pipe. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a pipeline inner wall anti-corrosion powder spraying system, which can apply the anti-corrosion powder in the powder storage tank to the surface of the inner wall of the pipeline in a uniform diffusion manner, effectively improving the thickness uniformity of the pipeline inner wall coating during the powder spraying operation, thereby improving the overall spraying quality of the pipeline inner wall, and also improving the spraying efficiency of the anti-corrosion powder on the pipeline inner wall.

[0004] The present application provides a pipeline inner wall anti-corrosion powder spraying system, comprising: a powder storage tank, a powder quantity control valve, a worm quantitative conveying device, a first driving mechanism, an adjustable speed motor, a Venturi powder injector, an adjustable air source conveying mechanism, a powder spray gun tube and a spinning powder diffusion nozzle;

[0005] The upper end of the powder storage tank is cylindrical, the lower end of the powder storage tank is in an inverted trapezoidal shape, a flow-aiding air pipe is arranged inside the powder storage tank, the flow-aiding air pipe is arranged close to the bottom of the powder storage tank, and the two ends of the flow-aiding air pipe are respectively in contact with the inner wall of the powder storage tank, the powder quantity control valve is arranged at the output end of the bottom of the powder storage tank, the first driving mechanism is connected to the worm quantitative conveying device, the adjustable speed motor is connected to the first driving mechanism, the output end of the bottom of the powder storage tank is connected to the input end of the worm quantitative conveying device, and a worm is built in the worm quantitative conveying device;

[0006] The output end of the adjustable air source conveying mechanism is communicated with the interior of the Venturi powder injector through the air inlet of the Venturi powder injector, the output end of the worm quantitative conveying device is connected to the input end of the Venturi powder injector, the output end of the Venturi powder injector is connected to the input end of the powder spray gun tube, the inner wall of the output end of the powder spray gun tube is provided with a rotary joint, and the self-spinning powder diffusion nozzle is installed on the powder spray gun tube through the rotary joint;

[0007] The self-spinning powder diffusion nozzle includes a nozzle body, a plurality of self-spinning blades and a plurality of auxiliary diffusion blades. The plurality of self-spinning blades and the plurality of auxiliary diffusion blades are arranged side by side and at intervals on the nozzle body, and each of the auxiliary diffusion blades is arranged between two self-spinning blades. The length of the auxiliary diffusion blade is half or two-thirds of the length of the self-spinning blade. The self-spinning blade and the auxiliary diffusion blade both present continuous curved surfaces that gradually bend away from the preset rotation direction, and an arc-shaped channel is formed between the self-spinning blade and the adjacent auxiliary diffusion blade.

[0008] According to some embodiments of the present application, the pipeline inner wall anti-corrosion powder spraying system also includes a control device, and the control device is respectively connected to the powder quantity control valve, the first driving mechanism, and the adjustable speed motor.

[0009] According to some embodiments of the present application, an air volume regulating valve is provided at the air inlet of the Venturi powder injector, and the air volume regulating valve is connected to the control device.

[0010] According to some embodiments of the present application, the pipeline inner wall anti-corrosion powder spraying system also includes a first powder conveying pipeline, the input end of the first powder conveying pipeline is connected to the output end of the powder storage tank, and the output end of the first powder conveying pipeline is connected to the input end of the worm quantitative conveying device.

[0011] According to some embodiments of the present application, the pipeline inner wall anti-corrosion powder spraying system also includes a second powder conveying pipeline, the input end of the second powder conveying pipeline is connected to the output end of the worm quantitative conveying device, and the output end of the second powder conveying pipeline is connected to the input end of the Venturi powder injector.

[0012] According to some embodiments of the present application, a powder input port is provided on the top of the powder storage tank, and a movable cover is provided on the powder input port.

[0013] According to some embodiments of the present application, the pipeline inner wall anti-corrosion powder spraying system also includes a gas input pipeline, and the side wall of the powder storage tank is provided with a pipeline opening. The gas input pipeline extends into the interior of the powder storage tank through the pipeline opening and is connected to the flow-aiding air pipe.

[0014] According to some embodiments of the present application, the spin-type powder diffusion nozzle further includes a limiting shaft, a first fastener and a guide cone, and the first fastener, the nozzle body and the guide cone are sequentially sleeved on the limiting shaft.

[0015] According to some embodiments of the present application, the pipeline inner wall anti-corrosion powder spraying system also includes a powder spray gun tube connector, the powder spray gun tube connector includes an internal connector and an external connector, the interior of the external connector is hollow, the internal connector is arranged inside the external connector, and the internal connector is fixedly connected to one end of the external connector, and a plurality of strip-shaped through holes are provided at the connection between the internal connector and the external connector, the internal connector is sleeved on the limiting shaft, and the internal connector is arranged between the nozzle body and the guide cone.

[0016] According to some embodiments of the present application, the continuous curved surface is an arc curved surface.

[0017] In the present application, the powder storage tank is used to temporarily store anti-corrosion powder. Since the interaction force between powder particles in the entire powder storage tank increases with decreasing height, the mutual interaction force between particles reaches a maximum at the outlet. In addition, the outlet diameter of the powder storage tank is small, and the material falls into a cone shape, so the mineral powder is easy to form arches and bridges, and its fluidity is greatly reduced, making it difficult to fall from the outlet. By laterally arranging a flow-aiding air pipe on the inverted trapezoidal inner wall of the tank at the lower end of the powder storage tank, the anti-corrosion powder near the flow-aiding air pipe is in a fluidized state, thereby improving the fluidity of the anti-corrosion powder and helping the anti-corrosion powder to fall smoothly from the output end at the bottom of the powder storage tank; the powder flow rate delivered from the powder storage tank to the worm quantitative conveying device is controlled by controlling the opening of the powder quantity control valve; the adjustable speed motor is used to accurately control the rotation speed of the first drive mechanism; the first drive mechanism is used to drive the worm in the worm quantitative conveying device to make reciprocating motion, so as to push the anti-corrosion powder to the output end of the worm quantitative conveying device through the rotation of the worm; the adjustable speed motor is used to control the first drive mechanism The rotation speed of the worm is precisely controlled so that the rotation speed of the worm is uniform, so that the powder flow rate delivered to the Venturi powder injector can be easily controlled. The adjustable gas source delivery mechanism is used to deliver gas to the Venturi powder injector in real time. The gas contacts the anti-corrosion powder in the Venturi powder injector, and the anti-corrosion powder is purged with the gas to make the anti-corrosion powder in a more fluffy state, thereby reducing the compaction of the powder. The gas after chamber pressurization is mixed with the anti-corrosion powder and quickly delivered to the output end and then delivered to the powder spray gun pipe from the output end, and then delivered from the powder spray gun pipe to the self-spinning powder diffusion nozzle, sprayed through the self-spinning powder diffusion nozzle and sprayed onto the inner wall of the pipeline; when the powder is sprayed from the powder spray gun pipe, the high-speed airflow entrains the powder and acts on a plurality of self-spinning blades and a plurality of auxiliary diffusion blades to make the self-spinning blades in a rotating state. The rotating self-spinning blades and auxiliary diffusion blades will simultaneously generate axial and radial diffusion forces when rotating, so that the powder can act on the surface of the inner wall of the pipeline in a uniform diffusion manner. Through this setting, the present application can apply the anti-corrosion powder in the powder storage tank to the surface of the inner wall of the pipeline in a uniformly diffused manner, effectively improving the uniformity of the thickness of the coating on the inner wall of the pipeline during the powder spraying operation, thereby improving the overall spraying quality of the inner wall of the pipeline, while also improving the spraying efficiency of the anti-corrosion powder on the inner wall of the pipeline.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 A schematic diagram of the structure of a pipeline inner wall anti-corrosion powder spraying system provided in an embodiment of the present application;

[0021] Figure 2 A schematic side view of a spin-type powder diffusion nozzle provided in an embodiment of the present application;

[0022] Figure 3 A schematic top view of a spin-type powder diffusion nozzle provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the main structure of a spin-type powder diffusion nozzle provided in an embodiment of the present application;

[0024] Figure 5 A schematic rear view of a spinning powder diffusion nozzle provided in an embodiment of the present application.

[0025] Reference numerals:

[0026] Powder storage tank 110, flow-aiding air pipe 111, gas input pipeline 112, movable cover plate 113, powder quantity control valve 114, first powder delivery pipeline 115;

[0027] A worm quantitative conveying device 120, an adjustable speed motor 121, a second powder conveying pipeline 122, and a first driving mechanism 123;

[0028] Venturi powder injector 130, adjustable air source delivery mechanism 131, powder spray gun tube 132;

[0029] A self-spinning powder diffusion nozzle 140, a nozzle body 141, a self-spinning blade 142, an auxiliary diffusion blade 143, an arc-shaped channel 144, an axial hole 145, a first fastener 146, a guide cone 147, and an external connecting piece 148;

[0030] Pipeline 200. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0035] Hot-melt powder coatings are widely used in the anti-corrosion treatment of special oil pipelines. They have good insulation, anti-corrosion and anti-waxing properties. Since China introduced the internal anti-corrosion technology of special oil pipelines in the 1990s, all kinds of drill pipes and oil casings are treated with anti-corrosion internal coatings before use. In order to ensure the continuity of the anti-corrosion coating, all kinds of short-section drill pipes and oil casing couplings need to be sprayed with anti-corrosion. At present, when the industry handles the powder spraying operation on the inner wall of this type of annular pipe fittings, the spraying equipment is mostly long-pole spray guns. During the spraying process, the operator uses a handheld long-pole spray gun to spray the inner wall of the pipe. However, the manual handheld spray gun is used for spraying, which is easy to cause uneven spraying of the paint during the spraying process, reducing the anti-corrosion treatment effect on the outer wall of the pipe. The handheld long pole uses a traditional powder spray head inserted into the inner cavity of the pipe, and the paint is sprayed on the inner wall of the pipe through multiple spray holes opened on the spray head. However, the spraying efficiency of the spray head of this equipment is low, and the spraying uniformity is relatively poor, resulting in different thicknesses of the powder sprayed on the inner wall of the pipe.

[0036] In order to solve the above-mentioned problems, the present application proposes a pipeline inner wall anti-corrosion powder spraying system. The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0037] Reference Figures 1 to 4The present application provides a pipeline inner wall anti-corrosion powder spraying system, including a powder storage tank 110, a powder quantity control valve 114, a worm quantitative conveying device 120, a first driving mechanism 123, an adjustable speed motor 121, a Venturi powder injector 130, an adjustable air source conveying mechanism 131, a powder spray gun tube 132 and a spin-type powder diffusion nozzle 140; the upper end of the powder storage tank 110 is cylindrical, the lower end of the powder storage tank 110 is in an inverted trapezoidal shape, and the inside of the powder storage tank 110 is provided with a flow-aiding air pipe 111, and the flow-aiding air pipe 111 is close to the powder. The bottom of the powder storage tank 110 is provided, and the two ends of the flow-aiding air pipe 111 are respectively in contact with the inner wall of the powder storage tank 110, the powder quantity control valve 114 is provided at the output end of the bottom of the powder storage tank 110, the first drive mechanism 123 is connected to the worm quantitative conveying device 120, the adjustable speed motor 121 is connected to the first drive mechanism 123, the output end of the bottom of the powder storage tank 110 is connected to the input end of the worm quantitative conveying device 120, and the worm is built in the worm quantitative conveying device 120; the output end of the adjustable air source conveying mechanism 131 is connected to the input end of the worm quantitative conveying device 120 through the Venturi powder spray The air inlet of the ejector 130 is communicated with the interior of the venturi powder ejector 130, the output end of the worm quantitative conveying device 120 is connected to the input end of the venturi powder ejector 130, the output end of the venturi powder ejector 130 is connected to the input end of the powder spray gun tube 132, the inner wall of the output end of the powder spray gun tube 132 is provided with a rotary joint, and the self-spinning powder diffusion nozzle 140 is installed on the powder spray gun tube 132 through the rotary joint; the self-spinning powder diffusion nozzle 140 includes a nozzle body 141, a plurality of self-spinning blades 142 and a plurality of The auxiliary diffusion blade 143, multiple spinning blades 142 and multiple auxiliary diffusion blades 143 are all arranged side by side and at intervals on the nozzle body 141, and each auxiliary diffusion blade 143 is arranged between two spinning blades 142. The length of the auxiliary diffusion blade 143 is half or two-thirds of the length of the spinning blade 142. The spinning blades 142 and the auxiliary diffusion blades 143 are both continuous curved surfaces that gradually bend away from the preset rotation direction, and an arc channel 144 is formed between the spinning blade 142 and the adjacent auxiliary diffusion blade 143.

[0038] It should be noted that the anti-corrosion powder transported to the powder storage tank 110 in the present application is sequentially sprayed onto the inner wall of the pipeline 200 through the first powder delivery pipeline 115, the spiral quantitative delivery device, the second powder delivery pipeline 122, the Venturi powder injector 130, the powder spray gun tube 132 and the spin-type powder diffusion nozzle 140.

[0039] It should be noted that when the anti-corrosion powder spraying system for the inner wall of the pipeline is working, the flow-aiding air pipe 111 is opened to prevent the anti-corrosion powder from accumulating and fluidizing it; at the same time, the powder quantity control valve 114 is adjusted according to the actual powder usage; the adjustable air source delivery mechanism 131 is opened, and the adjustable air source delivery mechanism 131 is used to allow compressed air to enter the Venturi powder injector 130. The Venturi powder injector 130 uses high-speed airflow to entrain the anti-corrosion powder and transport it into the powder spray gun tube 132. The anti-corrosion powder in the powder spray gun tube 132 is sprayed to the inner wall of the pipeline 200 through the spinning powder diffusion nozzle 140 so that the anti-corrosion powder is more evenly diffused.

[0040] It should be noted that the powder spray gun tube 132 and the spin-type powder diffusion nozzle 140 are connected by threads and can be disassembled for easy cleaning, so that there is no powder retention and deposition inside the powder spray gun tube 132, thereby extending the service life of the powder spray gun tube 132 and achieving a good spraying effect without powder carryover and avoiding pits. That is, the powder spray gun tube 132 and the spin-type powder diffusion nozzle 140 are connected by threads, which saves installation time, ensures the cleanliness of the inside of the powder spray gun tube 132, improves spraying efficiency, and promotes rapid spraying of powder coating.

[0041] In some embodiments, the first driving mechanism 123 is a driving motor, which is the power source of the worm quantitative conveying device 120. The rotation speed of the driving motor is uniform, so that the lead of the worm is uniform, so that the amount of powder delivered to the Venturi powder injector 130 is easy to control.

[0042] In this embodiment, six spinning blades 142 and auxiliary diffusion blades 143 are provided, and the length of the auxiliary diffusion blades 143 is half the length of the spinning blades 142. The spinning blades 142 and the auxiliary diffusion blades 143 are interlaced to avoid the powder being dispersed to a low degree by the six long spinning blades 142. The auxiliary diffusion blades 143 are interlaced in the six long spinning blades 142 to increase the degree of powder dispersion, so that the powder can be sprayed onto the inner wall of the pipe more evenly. In some embodiments, the spinning blades 142 and the auxiliary diffusion blades 143 can also be provided in other numbers, and the length of the auxiliary diffusion blades 143 can also be two-thirds of the length of the spinning blades 142, and are not limited to the embodiments of the present application.

[0043] It should be noted that not only multiple spinning blades 142 are provided, but multiple auxiliary diffusion blades 143 are interspersed to avoid providing only spinning blades 142, which would result in excessive gravity of the spinning powder diffusion nozzle 140, reduce the spinning efficiency of the spinning blades 142, and further reduce the degree of powder dispersion.

[0044] In this embodiment, the spinning blades 142 are connected from one end of the nozzle body 141 to the other end of the nozzle body 141 , and the auxiliary diffusion blades 143 are connected from the half or one third of the spinning blades 142 to the other end of the nozzle body 141 .

[0045] In the present application, the powder storage tank 110 is used to temporarily store the anti-corrosion powder. Since the interaction force between the powder particles in the entire powder storage tank 110 increases with the decrease of height, the interaction force between the particles reaches the maximum at the outlet. In addition, the outlet diameter of the powder storage tank 110 is small, and the material falls into a cone shape. The mineral powder is easy to form an arch and bridge, and the fluidity is greatly reduced, and it is not easy to fall from the outlet. By horizontally arranging a flow-aiding air pipe 111 on the inner wall of the inverted trapezoidal tank at the lower end of the powder storage tank 110, the anti-corrosion powder near the flow-aiding air pipe 111 is in a fluidized state, thereby improving the fluidity of the anti-corrosion powder. It helps the antiseptic powder to fall smoothly from the output end at the bottom of the powder storage tank 110; the powder flow rate delivered from the powder storage tank 110 to the worm quantitative delivery device 120 is controlled by controlling the opening of the powder quantity control valve 114; the adjustable speed motor 121 is used to accurately control the rotation speed of the first driving mechanism 123; the first driving mechanism 123 is used to drive the worm in the worm quantitative delivery device 120 to reciprocate, so as to push the antiseptic powder to the output end of the worm quantitative delivery device 120 through the rotation of the worm; the adjustable speed motor 121 is used to control the first driving mechanism 123 The rotation speed of the worm 23 is precisely controlled to make the rotation speed of the worm gear uniform, so that the powder flow rate delivered to the venturi powder injector 130 can be easily controlled. The adjustable gas source delivery mechanism 131 is used to deliver gas to the venturi powder injector 130 in real time. The gas contacts the anti-corrosion powder in the venturi powder injector 130, and the anti-corrosion powder is purged with the gas to make the anti-corrosion powder more fluffy, thereby reducing the compaction of the powder. The gas after the chamber is pressurized is mixed with the anti-corrosion powder and quickly delivered to the output end and then delivered from the output end to the powder spray gun tube 132 , and then transported from the powder spray gun tube 132 to the self-spinning powder diffusion nozzle 140, sprayed through the self-spinning powder diffusion nozzle 140 and sprayed toward the inner wall of the pipeline 200; when the powder is sprayed from the powder spray gun tube 132, the high-speed airflow entrains the powder and acts on multiple self-spinning blades 142 and multiple auxiliary diffusion blades 143 to make the self-spinning blades 142 rotate. The self-spinning blades 142 and the auxiliary diffusion blades 143 in the rotating state will simultaneously generate axial and radial diffusion forces when rotating, so that the powder can act on the surface of the inner wall of the pipeline 200 in a uniform diffusion manner. Through this arrangement, the present application can make the anti-corrosion powder in the powder storage tank 110 act on the surface of the inner wall of the pipeline 200 in a uniform diffusion manner, effectively improving the uniform thickness of the coating on the inner wall of the pipeline 200 during the powder spraying operation, thereby improving the overall spraying quality of the inner wall of the pipeline 200, and also improving the spraying efficiency of the anti-corrosion powder on the inner wall of the pipeline 200.

[0046] It can be understood that the pipeline inner wall anti-corrosion powder spraying system also includes a control device, which is respectively connected to the powder quantity control valve 114, the first driving mechanism 123, and the adjustable speed motor 121.

[0047] It should be noted that the opening degree of the powder quantity control valve 114 is controlled by the control device, thereby controlling the flow rate of the anti-corrosion powder delivered from the powder storage tank 110 to the worm quantitative conveying device 120, thereby achieving precise control of the powder delivery amount; the control device controls the adjustable speed motor 121 to adjust the speed of the first drive mechanism 123, and controls the first drive mechanism 123 to drive the worm quantitative conveying device 120 to enter a working state.

[0048] It can be understood that an air volume regulating valve is provided at the air inlet of the venturi powder injector 130, and the air volume regulating valve is connected to the control device.

[0049] In this embodiment, the opening of the air volume regulating valve is controlled by the control device, thereby achieving the amount of compressed air supplied from the air source conveying mechanism 131 to the venturi powder injector 130 .

[0050] Reference Figure 1 It can be understood that the pipeline inner wall anti-corrosion powder spraying system also includes a first powder conveying pipeline 115, the input end of the first powder conveying pipeline 115 is connected to the output end of the powder storage tank 110, and the output end of the first powder conveying pipeline 115 is connected to the input end of the worm quantitative conveying device 120.

[0051] In this embodiment, the first powder conveying pipeline 115 is a powder discharge pipeline 200 , through which the anticorrosive powder in the powder storage tank 110 is conveyed to the worm quantitative conveying device 120 .

[0052] Reference Figure 1 It can be understood that the pipeline inner wall anti-corrosion powder spraying system also includes a second powder conveying pipeline 122, the input end of the second powder conveying pipeline 122 is connected to the output end of the worm quantitative conveying device 120, and the output end of the second powder conveying pipeline 122 is connected to the input end of the Venturi powder injector 130.

[0053] It should be noted that the second powder conveying pipeline 122 is provided to convey the powder in the worm quantitative conveying device 120 to the Venturi powder injector 130 .

[0054] Reference Figure 1 It can be understood that a powder input port is provided on the top of the powder storage tank 110 , and a movable cover plate 113 is provided on the powder input port.

[0055] It should be noted that the movable cover 113 is opened to transport the external anti-corrosion powder from the powder input port to the powder storage tank 110 .

[0056] Reference Figure 1 It can be understood that the pipeline inner wall anti-corrosion powder spraying system also includes a gas input pipeline 112. The side wall of the powder storage tank 110 is provided with a pipeline port. The gas input pipeline 112 extends into the interior of the powder storage tank 110 through the pipeline port and is connected to the flow-aiding air pipe 111.

[0057] It should be noted that by setting up a gas input pipeline 112, the flow-aiding air pipe 111 can be replenished with gas in real time, so that the anti-corrosion powder near the flow-aiding air pipe 111 can be fluidized, thereby improving the fluidity of the anti-corrosion powder and helping the anti-corrosion powder to fall smoothly from the output end at the bottom of the powder storage tank 110.

[0058] Reference Figure 2 and Figure 5 It can be understood that the spin-type powder diffusion nozzle 140 also includes a limiting shaft, a first fastener 146 and a guide cone 147, and the first fastener 146, the nozzle body 141 and the guide cone 147 are sequentially sleeved on the limiting shaft.

[0059] It should be noted that an axial hole 145 is opened in the axial direction of the nozzle body 141, and the limiting shaft is passed through the axial hole 145 and is arranged in the nozzle body 141. By setting the limiting shaft, the nozzle body 141 and the spinning blades 142 and the auxiliary diffusion blades 143 on the nozzle body 141 can rotate around the limiting shaft during rotation.

[0060] It should be noted that the powder is sprayed from the powder spray gun tube 132 toward the spinning powder diffusion nozzle 140 , and the powder is guided by the guide cone 147 and then flows toward the spinning powder diffusion nozzle 140 .

[0061] Reference Figure 2 and Figure 5 It can be understood that the pipeline inner wall anti-corrosion powder spraying system also includes a powder spray gun tube connector, the powder spray gun tube connector includes an internal connector and an external connector 148, the interior of the external connector 148 is hollow, the internal connector is arranged inside the external connector 148, and the internal connector is fixedly connected to one end of the external connector 148, and a plurality of strip through holes are provided at the connection between the internal connector and the external connector 148, the internal connector is sleeved on the limit shaft, and the internal connector is arranged between the nozzle body 141 and the guide cone 147.

[0062] It should be noted that a plurality of strip-shaped through holes are provided at the connection between the internal connecting member and the external connecting member 148, so that the high-speed airflow sprayed from the powder spray gun tube 132 to the external connecting member 148 and the powder entrained in the high-speed airflow can flow to the spin-type powder diffusion nozzle 140 through the plurality of strip-shaped through holes.

[0063] It can be understood that the continuous curved surface is an arc curved surface.

[0064] It should be noted that the continuous curved surfaces of the spinning blades 142 and the auxiliary diffusion blades 143 that are gradually bent away from the preset rotation direction are both set as circular arc curved surfaces, so that an arc channel 144 is formed between the spinning blades 142 and the adjacent auxiliary diffusion blades 143, so that when the high-speed airflow carried by the powder when it is ejected from the injection tube flows through the arc channel 144, it will exert a force on the spinning blades 142 to push the spinning blades 142.

[0065] It can be understood that the tube inner wall powder diffusion spraying device also includes a second fastener, the second fastener is sleeved on the limiting shaft, and the second fastener is arranged between the internal connecting piece and the guide cone 147.

[0066] In this embodiment, the first fastener 146 and the second fastener are both screw fasteners.

[0067] It can be understood that a threaded connection portion is provided on the outside of the end of the external connection member 148 away from the internal connection member, and the external connection member 148 is used for threaded connection with the external powder spray gun tube 132 through the threaded connection portion.

[0068] It should be noted that by providing an internal connector and an external connector 148 in the powder spray gun pipe connector, the powder spray gun pipe 132 and the spin-type powder diffusion nozzle 140 can be connected via the powder spray gun pipe connector.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0071] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pipeline inner wall anti-corrosion powder spraying system, characterized in that: include: Powder storage tank, powder quantity control valve, worm quantitative conveying device, first drive mechanism, adjustable speed motor, Venturi powder injector, adjustable air source conveying mechanism, powder spray gun tube and spin-type powder diffusion nozzle; The upper end of the powder storage tank is cylindrical, the lower end of the powder storage tank is in an inverted trapezoidal shape, a flow-aiding air pipe is arranged inside the powder storage tank, the flow-aiding air pipe is arranged close to the bottom of the powder storage tank, and the two ends of the flow-aiding air pipe are respectively in contact with the inner wall of the powder storage tank, the powder quantity control valve is arranged at the output end of the bottom of the powder storage tank, the first driving mechanism is connected to the worm quantitative conveying device, the adjustable speed motor is connected to the first driving mechanism, the output end of the bottom of the powder storage tank is connected to the input end of the worm quantitative conveying device, and a worm is built in the worm quantitative conveying device; The output end of the adjustable air source conveying mechanism is communicated with the interior of the Venturi powder injector through the air inlet of the Venturi powder injector, the output end of the worm quantitative conveying device is connected to the input end of the Venturi powder injector, the output end of the Venturi powder injector is connected to the input end of the powder spray gun tube, the inner wall of the output end of the powder spray gun tube is provided with a rotary joint, and the self-spinning powder diffusion nozzle is installed on the powder spray gun tube through the rotary joint; The self-spinning powder diffusion nozzle includes a nozzle body, a plurality of self-spinning blades and a plurality of auxiliary diffusion blades. The plurality of self-spinning blades and the plurality of auxiliary diffusion blades are arranged side by side and at intervals on the nozzle body, and each of the auxiliary diffusion blades is arranged between two self-spinning blades. The length of the auxiliary diffusion blade is half or two-thirds of the length of the self-spinning blade. The self-spinning blade and the auxiliary diffusion blade both present continuous curved surfaces that gradually bend away from the preset rotation direction, and an arc-shaped channel is formed between the self-spinning blade and the adjacent auxiliary diffusion blade.

2. The pipeline inner wall anti-corrosion powder spraying system according to claim 1 is characterized in that: The pipeline inner wall anti-corrosion powder spraying system also includes a control device, which is respectively connected to the powder quantity control valve, the first driving mechanism, and the adjustable speed motor.

3. The pipeline inner wall anti-corrosion powder spraying system according to claim 2 is characterized in that: An air volume regulating valve is arranged at the air inlet of the Venturi powder injector, and the air volume regulating valve is connected to the control device.

4. The pipeline inner wall anti-corrosion powder spraying system according to claim 1 is characterized in that: The pipeline inner wall anti-corrosion powder spraying system also includes a first powder conveying pipeline, the input end of the first powder conveying pipeline is connected to the output end of the powder storage tank, and the output end of the first powder conveying pipeline is connected to the input end of the worm quantitative conveying device.

5. The pipeline inner wall anti-corrosion powder spraying system according to claim 1 is characterized in that: The pipeline inner wall anti-corrosion powder spraying system also includes a second powder conveying pipeline, the input end of the second powder conveying pipeline is connected to the output end of the worm quantitative conveying device, and the output end of the second powder conveying pipeline is connected to the input end of the Venturi powder injector.

6. The pipeline inner wall anticorrosion powder spraying system according to claim 1 is characterized in that: A powder material input port is provided on the top of the powder storage tank, and a movable cover plate is provided on the powder material input port.

7. The pipeline inner wall anticorrosion powder spraying system according to claim 1 is characterized in that: The pipeline inner wall anti-corrosion powder spraying system also includes a gas input pipeline. The side wall of the powder storage tank is provided with a pipeline opening. The gas input pipeline extends into the interior of the powder storage tank through the pipeline opening and is connected to the flow-aiding air pipe.

8. The pipeline inner wall anticorrosion powder spraying system according to claim 1 is characterized in that: The spin-type powder diffusion nozzle also includes a limiting shaft, a first fastener and a guide cone. The first fastener, the nozzle body and the guide cone are sequentially sleeved on the limiting shaft.

9. The pipeline inner wall anticorrosion powder spraying system according to claim 8, characterized in that: The pipeline inner wall anti-corrosion powder spraying system also includes a powder spray gun tube connector, which includes an internal connector and an external connector. The interior of the external connector is hollow, and the internal connector is arranged inside the external connector, and the internal connector is fixedly connected to one end of the external connector, and a plurality of strip-shaped through holes are provided at the connection between the internal connector and the external connector, and the internal connector is sleeved on the limiting shaft, and the internal connector is arranged between the nozzle body and the guide cone.

10. The pipeline inner wall anti-corrosion powder spraying system according to claim 1, characterized in that: The continuous curved surface is an arc curved surface.

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