A pipe inner wall spraying device

Abstract

The invention relates to a pipeline inner wall spraying device, which belongs to the technical field of pipeline spraying and solves the problems existing in the current pipeline spraying device during cleaning. The invention comprises a pipeline supporting mechanism, a spray gun mechanism is arranged on one side of the pipeline supporting mechanism, the spray gun mechanism is connected to a feeding mechanism, a cleaning mechanism is arranged between the spray gun mechanism and the pipeline supporting mechanism, the cleaning mechanism comprises a cleaning box, the cleaning box is connected to a moving mechanism, the output movement direction of the moving mechanism and the output movement direction of the feeding mechanism are perpendicular to each other, the cleaning box is provided with an opening for the spray gun mechanism to pass through, the bottom of the cleaning box is connected to one end of a waste liquid recovery pipeline, the other end of the waste liquid recovery pipeline is connected to a waste liquid barrel, and the pipeline inner wall spraying device of the invention is adopted, and the surrounding environment is not affected during cleaning.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline coating spraying, and in particular to a pipeline inner wall spraying device. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the rapid development of modern industry, pipelines, as important facilities for conveying media, have been widely used in many fields such as petroleum, chemical industry, electricity, shipbuilding, and construction. The anti-corrosion, waterproof and wear-resistant coating treatment of the inner wall of the pipeline plays a vital role in extending the service life of the pipeline and ensuring the safety of transportation. However, the traditional inner wall spraying technology of the pipeline has many shortcomings.

[0004] Manual spraying or using inefficient equipment to spray the inner wall of the pipeline is labor-intensive and has low operating efficiency, which is difficult to meet the needs of large-scale industrial production. At present, automatic spraying equipment for the inner wall of the pipeline has emerged, which can realize the automatic spraying of the inner wall coating of the pipeline, reduce labor intensity, and improve operating efficiency. When the automatic spraying equipment for the inner wall of the pipeline cleans its spray gun and pipeline, the cleaning liquid is injected into the pipeline and spray gun of the automatic spraying equipment, and then the cleaning liquid is sprayed through the spray gun to clean the spray gun and the pipeline. When the current automatic spraying equipment for the inner wall of the pipeline is cleaned, the spray gun sprays the waste liquid of the cleaning liquid after cleaning into the surrounding environment, which has an adverse effect on the working environment of the staff and the automatic spraying equipment. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a pipeline inner wall spraying device, which avoids the adverse effects on the surrounding environment when the spray gun and the pipeline are cleaned.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] An embodiment of the present invention provides a pipeline inner wall spraying device, including a pipeline support mechanism, a spray gun mechanism is provided on one side of the pipeline support mechanism, the spray gun mechanism is connected to a feeding mechanism, a cleaning mechanism is provided between the spray gun mechanism and the pipeline support mechanism, the cleaning mechanism includes a cleaning box, the cleaning box is connected to a moving mechanism, the output movement direction of the moving mechanism and the output movement direction of the feeding mechanism are perpendicular to each other, the cleaning box is provided with an opening for the spray gun mechanism to pass through, the bottom of the cleaning box is connected to one end of a waste liquid recovery pipeline, and the other end of the waste liquid recovery pipeline is connected to a waste liquid barrel.

[0008] Optionally, a brush is provided on the hole surface of the opening.

[0009] Optionally, the pipe support mechanism includes a first support block for supporting one end of the pipe and a second support block for supporting the other end of the pipe, the top surfaces of the first support block and the second support block are both provided with V-shaped grooves matching the pipe, and the spray gun mechanism adopts a pneumatic rotary spray gun mechanism.

[0010] Optionally, a groove surface of the V-shaped groove for matching with the pipe is provided with a silicone buffer insulation pad.

[0011] Optionally, the pneumatic rotary spray gun mechanism is connected to the airless sprayer via a feed pipe and connected to the air compressor via an air intake pipe.

[0012] Optionally, the pneumatic rotary spray gun mechanism includes a rotating power chamber and a material mixing chamber arranged in front and back, the rotating power chamber and the material mixing chamber are connected by a connecting piece, a rotating shaft is rotatably connected in the rotating power chamber, the rotating shaft is provided with blades, the rotating power chamber is also provided with an air inlet and an exhaust port, the air inlet is connected to the air inlet pipe, the front end of the rotating shaft extends to the outside of the rotating power chamber and is connected to the rotating head, the material mixing chamber is connected to the feed pipe, a plurality of spiral conveying rods are provided inside the material mixing chamber, the discharge end of the material mixing chamber is rotatably connected to the rotating chamber, the rotating chamber is connected to one end of a plurality of material pipes, and the other end of the material pipe is connected to the rotating head.

[0013] Optionally, adjacent spiral conveying rods are connected via a transmission mechanism, and at least one spiral conveying rod is connected to a power element disposed at the end of the material mixing chamber.

[0014] Optionally, a splash shield for installation at the end of the pipeline is further included, wherein the splash shield for installation at the end of the pipeline close to the spray gun mechanism is provided with a through hole for the spray gun mechanism to pass through.

[0015] Optionally, the splash shield is provided with a second fixing hole matching the first fixing hole on the flange at the end of the pipeline.

[0016] Optionally, a heating belt is also included for wrapping around the outer circumference of the pipeline.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The pipeline inner wall spraying device of the present invention is provided with a moving mechanism and a cleaning box. The cleaning box is provided with an opening for the spray gun mechanism to extend therein, and the cleaning box is connected to a waste liquid barrel through a waste liquid recovery pipeline. When the spray gun mechanism and the corresponding pipeline need to be cleaned, the cleaning box is moved to the opening corresponding to the spray gun mechanism by the moving mechanism, and the feeding mechanism drives the spray gun mechanism to move until the end of the spray gun mechanism extends into the cleaning box. At this time, the spray gun mechanism can be started, and cleaning liquid is injected into the spray gun mechanism. The cleaning liquid is sprayed into the cleaning box from the end of the spray gun mechanism to clean the spray gun mechanism and the corresponding pipeline. The waste liquid after cleaning in the cleaning box flows into the waste liquid barrel through the waste liquid recovery pipeline and is collected by the waste liquid barrel. The waste liquid will not flow to the environment around the spraying device, thereby avoiding adverse effects on the spraying device and the working environment of the staff.

[0019] 2. The pipeline inner wall spraying device of the present invention has a material mixing chamber in the spray gun mechanism. The two components of the material can be fully mixed during the conveying process of multiple spiral conveying rods in the material mixing chamber, and then sprayed out through the discharge end of the material pipe, thereby ensuring the quality of the pipeline inner wall coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0022] Figure 2 The structure of the pipeline support mechanism and the cleaning mechanism of the embodiment 1 of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 3 The structure of the pipeline support mechanism and the cleaning mechanism of the embodiment 1 of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 4 It is a schematic diagram of the assembly of the feeding mechanism and the spray gun mechanism of Example 1 of the present invention;

[0025] Figure 5 is a schematic diagram of the structure of the spray gun mechanism of embodiment 1 of the present invention;

[0026] Figure 6 The spray gun mechanism of embodiment 1 of the present invention is shown in cross section Figure 1 ;

[0027] Figure 7 The spray gun mechanism of embodiment 1 of the present invention is shown in cross section Figure 2 ;

[0028] Figure 8is a schematic diagram of the installation of the blade on the rotating shaft in Example 1 of the present invention;

[0029] Among them, 1. pipeline support mechanism, 2. spray gun mechanism, 3. feeding mechanism, 4. air compressor, 5. airless sprayer, 6. cleaning mechanism, 7. pipeline, 8. heating belt, 9. control cabinet, 10. splash shield, 11. workbench, 12. photoelectric sensor, 13. spray gun mechanism mounting shell, 14. counterweight, 15. air intake pipeline, 16. feed pipe;

[0030] 1-1. Support table, 1-2. First support block, 1-3. Second support block;

[0031] 2-1. Rotating power cavity, 2-2. Material mixing cavity, 2-3. First sleeve, 2-4. Second sleeve, 2-5. Rotating shaft, 2-6. Blades, 2-7. Air inlet, 2-8. Exhaust port, 2-9. Rotating head, 2-10. Screw conveying rod, 2-11. Gear transmission mechanism, 2-12. Motor, 2-13. Feed channel, 2-14. Rotating cavity, 2-15. Material pipe;

[0032] 6-1. Cleaning box, 6-2. Opening hole, 6-3. Moving mechanism, 6-4. Waste liquid recovery pipeline, 6-5. Waste liquid barrel. DETAILED DESCRIPTION

[0033] Example 1

[0034] This embodiment provides a pipeline inner wall spraying device, such as Figure 1 As shown, it includes a pipeline support mechanism 1, which is used to position and support the pipeline 7. A spray gun mechanism 2 is provided on one side of the pipeline support mechanism 1. The spray gun mechanism 2 is connected to a feeding mechanism 3. The feeding mechanism 3 can drive the spray gun mechanism 2 to move along a first direction, and the first direction is the axial direction of the pipeline 7, so that the spray gun mechanism 2 can extend into the pipeline 7 to spray the coating on the inner wall of the pipeline 7. The spray gun mechanism 2 adopts a pneumatic rotary spray gun mechanism, and the spray gun mechanism 2 is connected to an air compressor 4 and an airless sprayer 5. A cleaning device is provided between the spray gun mechanism 2 and the pipeline support mechanism 1. The cleaning mechanism 6 comprises a cleaning box 6-1, a box wall of the cleaning box 6-1 on one side facing the spray gun mechanism 2 is provided with an opening 6-2 for the spray gun mechanism 2 to extend therein, the cleaning box 6-1 is connected to a moving mechanism 6-3, the moving mechanism 6-3 can drive the cleaning box 6-1 to move in a second direction, the second direction is perpendicular to the first direction, the bottom of the cleaning box 6-1 is connected to a waste liquid barrel 6-5 via a waste liquid recovery pipeline 6-4, the waste liquid in the cleaning box 6-1 can enter the waste liquid barrel 6-5 via the waste liquid recovery pipeline 6-4 to collect the cleaning liquid waste after cleaning.

[0035] like Figure 2-Figure 3As shown, the pipeline support mechanism 1 includes a support platform 1-1, and support blocks are respectively arranged at both ends of the support platform 1-1, and the two support blocks are respectively a first support block 1-2 and a second support block 1-3. The first support block 1-2 is used to support one end of the pipeline 7, and the second support block 1-3 is used to support the other end of the pipeline 7. The upper surfaces of the first support block 1-2 and the second support block 1-3 are both provided with V-shaped grooves matching the pipeline 7, and the pipeline 7 is positioned and supported by the V-shaped grooves.

[0036] Furthermore, the groove surface of the V-shaped groove used to cooperate with the pipe 7 is provided with a silicone buffer insulation pad, which on the one hand prevents collision damage caused when the pipe is lowered to the first support block 1-2 and the second support block 1-3, and on the other hand prevents the pipe 7 from transferring heat to the pipe support mechanism 1 due to preheating before spraying.

[0037] In this embodiment, the first support block 1-2 and the second support block 1-3 are used to support the DN300 pipe. After support, the spray gun mechanism 2 is coaxially arranged with the DN300 pipe. In order to meet the inner wall spraying requirements of other pipes, the V-shaped grooves of the first support block 1-2 and the second support block 1-3 are also provided with countersunk threaded holes, so that the first support block 1-2 and the second support block 1-3 can be detachably connected to the support blocks corresponding to the other smaller diameter pipes, such as the support blocks corresponding to the DN125 pipe, so as to meet the spraying requirements of the inner walls of pipes of other specifications.

[0038] In this embodiment, the upper surfaces of the support blocks corresponding to pipes of different specifications are all provided with V-shaped grooves matching the pipes, and the groove surfaces of the V-shaped grooves used to match the pipes are provided with silicone cushioning and heat-insulating pads.

[0039] The pipeline inner wall spraying device further comprises a heating belt 8, which is used to wrap around and cover the outer circumference of the pipeline 7 to preheat the pipeline 7 before the inner wall of the pipeline 7 is sprayed.

[0040] Furthermore, the heating belt 8 is connected to a temperature probe, and both the heating belt 8 and the temperature probe are connected to a control system in a control cabinet 9 . The temperature probe can detect the heating temperature of the heating belt 8 so that the control system can accurately control the heating temperature of the heating belt 8 .

[0041] It also includes a splash shield 10 for fixing on the end of the pipeline. When the pipeline 7 is sprayed, the splash shield 10 is fixed on the end of the pipeline 7 to prevent the coating material from splashing into the surrounding environment.

[0042] In this embodiment, the splash shield 10 is provided with a plurality of second fixing holes, wherein the second fixing holes match the first fixing holes on the flange at the end of the pipeline 7, and the splash shield 10 can be detachably fixedly connected to the flange at the end of the pipeline through the second fixing holes and bolts and nuts.

[0043] A through hole for the spray gun mechanism 2 to extend into the interior of the pipeline 7 is provided at the center of the splash shield 10 which is arranged at the end of the pipeline close to the spray gun mechanism.

[0044] The moving mechanism 6-3 is fixed on the end of the support platform 1-1 close to the spray gun mechanism 2. In this embodiment, the moving mechanism 6-3 adopts a first screw transmission mechanism arranged along the second direction, including a first base, and a first motor is provided at one end of the first base. Preferably, the first motor adopts a stepper motor connected to the control system, the first motor is connected to the first screw, and the first screw is provided with a first screw slider which is slidably connected to the first base. The first screw slider is connected to the bottom of the cleaning box 6-1, and can drive the cleaning box 6-1 to move along the second direction.

[0045] In this embodiment, photoelectric sensors connected to the control system are provided at both ends of the first base. Preferably, the photoelectric sensor adopts a U-groove photoelectric switch. Correspondingly, the first lead screw slider connected to the cleaning box 6-1 is provided with a detection piece corresponding to the photoelectric sensor to limit the movement position of the cleaning box 6-1.

[0046] The wall of the cleaning box 6-1 facing the spray gun mechanism 2 is provided with an opening 6-2 for the spray gun mechanism 2 to extend into, and a brush is provided on the hole surface of the opening 6-2 to prevent the cleaning liquid from emitting from the opening 6-2 to the surrounding environment.

[0047] The bottom of the cleaning box 6-1 is connected to the waste liquid barrel 6-5 through the waste liquid recovery pipeline 6-4. Since the cleaning box 6-1 moves driven by the moving mechanism 6-3, the waste liquid recovery pipeline 6-4 adopts a flexible tube, such as a silicone tube or a rubber tube, etc., which can be set by technical personnel in this field according to actual needs.

[0048] like Figure 4 As shown, the feeding mechanism 3 is installed on the workbench 11, and the workbench 11 is fixedly connected to the end of the support table 1-1. In this embodiment, the feeding mechanism 3 adopts a second screw transmission mechanism arranged along the first direction, including a second base, and the second base is connected to the workbench 11 through a plurality of support seats. A second motor is provided at one end of the second base. Preferably, the second motor adopts a stepping motor connected to the control system, and the second motor is connected to the second screw. The second screw is provided with a second screw slider slidably connected to the second base, and the second screw slider is connected to the spray gun mechanism 2 to drive the spray gun mechanism 2 to move along the first direction.

[0049] Furthermore, the two ends of the second base are provided with photoelectric sensors 12 connected to the control system. Preferably, the photoelectric sensor 12 adopts a U-groove photoelectric switch. Correspondingly, the second lead screw slider connected to the spray gun mechanism 2 is provided with a detection piece corresponding to the photoelectric sensor 12, which is used to limit the movement of the spray gun mechanism 2.

[0050] The second lead screw slider of the second lead screw transmission mechanism is fixedly connected to the spray gun mechanism mounting shell 13. The spray gun mechanism 2 is mounted at the front end of the spray gun mechanism mounting shell 13, and a counterweight block 14 is provided at the rear end to ensure the stability of the spray gun mechanism 2 during operation.

[0051] like Figure 5-Figure 8 As shown, the spray gun mechanism 2 adopts a pneumatic rotary spray gun mechanism, including a rotary power cavity 2-1 and a material mixing cavity 2-2 coaxially arranged front and back, and the rotary power cavity 2-1 and the material mixing cavity 2-2 are connected into a whole through a connecting piece.

[0052] The connecting part includes a first sleeve 2-3 sleeved on the outer periphery of the rotating power chamber 2-1 and a second sleeve 2-4 sleeved on the material mixing chamber 2-2. The first sleeve 2-3 and the second sleeve 2-4 are connected as a whole through a semicircular sleeve, wherein the second sleeve 2-4 is fixedly connected to the front end of the spray gun mechanism mounting shell 13.

[0053] The rotating power cavity 2-1 and the material mixing cavity 2-2 both adopt a cylindrical structure. A rotating shaft 2-5 is coaxially arranged inside the rotating power cavity 2-1. The rotating shaft 2-5 is rotatably connected to the rotating power cavity 2-1. The internal cavity cross-section of the rotating power cavity 2-1 is elliptical. The rotating shaft 2-5 is provided with a plurality of blades 2-6 at equal intervals along the circumferential direction. The width direction of the blades 2-6 is arranged along the radial direction of the rotating shaft 2-5 and is slidably connected to the rotating shaft 2-5. With this arrangement, the blades 2-6 can move radially along the rotating shaft 2-5, which can increase the upper limit of the rotation speed of the rotating shaft 2-5.

[0054] The cavity wall of the rotating power cavity 2-1 is also provided with an air inlet 2-7 and an exhaust port 2-8, wherein the air inlet 2-7 includes a first air inlet portion arranged along the axial direction of the rotating power cavity 2-1 and a second air inlet portion connected to the first air inlet portion and arranged radially along the rotating power cavity 2-1, the second air inlet portion is connected to the internal cavity of the rotating power cavity 2-1, the air inlet end of the first air inlet portion is connected to one end of the air inlet pipe 15, and the other end of the air inlet pipe 15 is connected to the air compressor 4.

[0055] Furthermore, at least a portion of the air intake pipe 15 is made of a flexible tube made of rubber.

[0056] The exhaust port 2-8 includes a first exhaust portion arranged along the axial direction of the rotating power cavity 2-1, one end of the first exhaust portion is connected to a second exhaust portion arranged radially along the rotating power cavity 2-1, and the other end extends to the end face of the rotating power cavity 2-1 to connect to the external environment, and the second exhaust portion is connected to the internal space of the rotating power cavity 2-1.

[0057] The air compressor 4 can introduce compressed air into the rotary power cavity 2-1 through the air intake duct 15 and the air intake port 2-7, thereby driving the rotary shaft 2-5 to rotate through the blades 2-6.

[0058] The front end of the rotating shaft 2-5 extends out of the rotating power cavity 2-1 and is connected to a rotating head 2-9.

[0059] A plurality of screw conveying rods 2-10 are provided in the material mixing chamber 2-2. In the present embodiment, two screw conveying rods 2-10 are provided. Both of the two screw conveying rods 2-10 are rotatably connected to the rear end cavity wall of the material mixing chamber 2-2. A power chamber is provided at the rear end of the material mixing chamber 2-2. A transmission mechanism connected to the two screw conveying rods 2-10 is provided in the power chamber. The transmission mechanism adopts a gear transmission mechanism 2-11 to realize the synchronous reverse rotation of the two screw conveying rods 2-10. Accordingly, the two screw conveying rods 2-10 rotate in opposite directions to realize the conveying of materials. One of the screw conveying rods 2-10 is connected to a power element installed in the power chamber, and the power element adopts a motor 2-12.

[0060] A feed chamber is formed between the rear end of the power cavity and the rear end of the second sleeve 2-4. The feed chamber is connected to one end of the feed channel 2-13. The feed channel 2-13 passes through the power cavity and is connected to the material mixing cavity 2-2 to realize the feeding of the material mixing cavity 2-2.

[0061] The feed chamber is connected to one end of the feed pipe 16, and the other end of the feed pipe 16 is connected to the airless sprayer 5. The airless sprayer technology can produce a fine atomization effect, ensure the uniform distribution of the coating on the inner wall of the pipe 7, avoid the problem of uneven coating thickness that may occur in the traditional method, and the airless sprayer 5 can generate a large pressure, so that the paint particles can penetrate deeper into the microscopic pores on the surface of the pipe 7, thereby enhancing the adhesion between the coating and the inner wall of the pipe 7.

[0062] Furthermore, at least a portion of the feed pipe 16 is a flexible tube made of rubber.

[0063] Furthermore, a flow regulating valve is provided on the feed pipe 16, and the flow regulating valve is connected to the control system to control the flow of the material.

[0064] The front end of the material mixing cavity 2-2 is rotationally connected and communicated with the rotating cavity 2-14, the rotating cavity 2-14 is connected to one end of a plurality of material pipes 2-15, and the other ends of the plurality of material pipes 2-15 are connected to the rotating head 2-9 to form an injection port.

[0065] In this embodiment, the airless sprayer 5 delivers the two components of the coating material into the material mixing chamber 2-2, and the two spiral conveying rods 2-10 drive the two components of the material forward and further mix them, and then the mixed material enters the rotating chamber 2-14, and then enters the material pipe 2-15. The material pipe 2-15 rotates with the rotating head 2-9, and the discharge end of the material pipe 2-15 rotates and sprays the coating material out.

[0066] In the spray gun mechanism 2 of this embodiment, the two components of the material can be further fully mixed during the conveying process of the two spiral conveying rods 2-10 in the material mixing chamber 2-2, and then sprayed through the discharge end of the material pipe 2-15, thereby ensuring the quality of the coating on the inner wall of the pipeline.

[0067] In this embodiment, the rotating head 2 - 9 realizes rotary spraying under the drive of the air compressor 4 , and the rotation speed is controllable by adjusting the pressure of the air compressor 4 .

[0068] The material enters the spray gun mechanism 2 through the airless sprayer 5, the feeding speed is achieved by adjusting the airless sprayer 5, and the flow rate of the sprayed material by the spray gun mechanism 2 is controlled by the flow regulating valve.

[0069] The working method of the pipeline inner wall spraying device of this embodiment is:

[0070] After the pipeline 7 is hoisted to the first support block 1-2 and the second support block 1-3, a heating belt 8 is coated on the outer periphery of the pipeline 7, and the pipeline 7 is heated to a set preheating temperature by using the heating belt 8. Then, splash guards 10 are installed at both ends of the pipeline 7, the heating belt 8 is removed, and the air compressor 4 and the airless sprayer 5 are started. The material enters the spray gun mechanism 2 through the airless sprayer 5, and the rotating head 2-9 rotates under the drive of the air compressor 4, thereby realizing rotary spraying. The feeding mechanism 3 works at a speed v, driving the spray gun mechanism 2 to extend into the interior of the pipeline 7 and move along the axial direction of the pipeline. At the same time, the air compressor 4 drives the rotating head 2-9 to rotate at an angular velocity of w to spray the inner wall of the pipeline 7.

[0071] After spraying is finished, the spray gun mechanism 2 returns to the original position, and after the splash shield 10 is removed, the pipeline 7 can be lifted off.

[0072] When the spray gun mechanism 2 and the corresponding feed pipe 16 need to be cleaned, the moving mechanism 6-3 drives the cleaning box 6-1 to move until the opening 6-2 corresponds to the spray gun mechanism 2, and the feeding mechanism 3 drives the front end of the spray gun mechanism 2 to enter the cleaning box 6-1, and the airless sprayer 5 inhales the cleaning liquid and starts the cleaning action. The cleaning liquid is sprayed into the cleaning box 6-1 by the spray gun mechanism 2, and the cleaning liquid waste in the cleaning box 6-1 enters the waste liquid barrel 6-5 through the waste liquid recovery pipeline 6-4. After the cleaning set time, the cleaning action is completed, the spray gun mechanism 2 returns to the origin driven by the feeding mechanism 3, and the cleaning box 6-1 returns to the origin driven by the moving mechanism 6-3, and the spraying is completed.

[0073] In the pipe inner wall spraying device of this embodiment, the waste liquid after cleaning in the cleaning box 6-1 flows into the waste liquid barrel 6-5 through the waste liquid recovery pipeline 6-4 and is collected by the waste liquid barrel 6-5. The waste liquid will not flow to the environment around the spraying device, avoiding adverse effects on the spraying device and the working environment of the staff.

[0074] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe inner wall spraying device, characterized in that: It includes a pipeline support mechanism, a spray gun mechanism is provided on one side of the pipeline support mechanism, the spray gun mechanism is connected to the feeding mechanism, a cleaning mechanism is provided between the spray gun mechanism and the pipeline support mechanism, the cleaning mechanism includes a cleaning box, the cleaning box is connected to the moving mechanism, the output movement direction of the moving mechanism is perpendicular to the output movement direction of the feeding mechanism, the cleaning box is provided with an opening for the spray gun mechanism to pass through, the bottom of the cleaning box is connected to one end of the waste liquid recovery pipeline, and the other end of the waste liquid recovery pipeline is connected to the waste liquid barrel; the spray gun mechanism adopts a pneumatic rotary spray gun mechanism, the pneumatic rotary spray gun mechanism includes a rotary power cavity and a material mixing cavity arranged front and back, the internal cavity cross-section of the rotary power cavity is elliptical, the material mixing cavity is connected to the feeding pipe, a plurality of spiral conveying rods are arranged inside, the discharge end of the material mixing cavity is rotatably connected to the rotating cavity, the rotating cavity is connected to one end of a plurality of material pipes, the other end of the material pipe is connected to the rotating head, and adjacent spiral conveying rods are connected by a transmission mechanism, the transmission mechanism adopts a gear transmission mechanism to realize the synchronous reverse rotation of the two spiral conveying rods, and at least one spiral conveying rod is connected to the power element arranged at the end of the material mixing cavity.

2. A pipe inner wall spraying device as claimed in claim 1, characterized in that: The hole surface of the opening is provided with a brush.

3. A pipe inner wall spraying device as claimed in claim 1, characterized in that: The pipeline support mechanism comprises a first support block for supporting one end of the pipeline and a second support block for supporting the other end of the pipeline. The top surfaces of the first support block and the second support block are both provided with V-shaped grooves matching the pipeline.

4. A pipe inner wall spraying device as claimed in claim 3, characterized in that: The groove surface of the V-shaped groove used to match the pipe is provided with a silicone buffer insulation pad.

5. A pipe inner wall spraying device as claimed in claim 3, characterized in that: The pneumatic rotary spray gun mechanism is connected to the airless sprayer through a feed pipe and is connected to the air compressor through an air intake pipe.

6. A pipe inner wall spraying device as claimed in claim 1, characterized in that: The rotary power cavity and the material mixing cavity are connected by a connecting piece. A rotating shaft is rotatably connected in the rotary power cavity. The rotating shaft is provided with blades. The rotary power cavity is also provided with an air inlet and an exhaust port. The air inlet is connected to the air inlet pipe. The front end of the rotating shaft extends to the outside of the rotary power cavity and is connected to the rotating head.

7. A pipe inner wall spraying device as claimed in claim 1, characterized in that: The utility model also comprises a splash shield for being installed at the end of the pipeline, wherein the splash shield for being installed at the end of the pipeline close to the spray gun mechanism is provided with a through hole for the spray gun mechanism to pass through.

8. A pipe inner wall spraying device as claimed in claim 7, characterized in that: The splash shield is provided with a second fixing hole matching the first fixing hole on the flange plate at the end of the pipeline.

9. A pipe inner wall spraying device as claimed in claim 1, characterized in that: Also included is a heating tape for wrapping around the outer circumference of the pipeline.

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