Device and method for coating inner wall of long and narrow space

Abstract

The invention discloses a coating device and method for the inner wall of a long and narrow space. The device comprises a paint spraying gun device with a plurality of compressed air chambers, the paint spraying gun device is connected with a suspensible conveying nested hose set, and the conveying nested hose set is connected to a nozzle of each compressed air chamber; a coating atomization flow guide assembly is arranged at an outlet of the conveying nested hose set. During use, the conveying nested hose set is assembled, and a plurality of starting ends of the conveying nested hose set are connected with nozzles of a plurality of compressed air chambers respectively; the coating atomization flow guide assembly is installed at an outlet of the conveying nested hose set; one compressed air chamber is used for ventilating a hose on the outermost layer of the conveying nested hose group, so that the other end of the conveying nested hose group floats; and the other compressed air chambers are used for ventilating the inner-layer hose of the conveying nested hose group, and paint spraying is realized through the paint atomization flow guide assembly at the other end. And the quality problem of non-uniform coating thickness caused by the paint filling process of the oil mist sealing component of the main pump motor can be eliminated.

Description

Technical Field

[0001] The present invention relates to a coating device and method for the inner wall of a narrow space, belonging to the technical field of coating. Background Art

[0002] The main pump motor is an important component in the reactor coolant pump, the only continuously operating equipment in the main system of the nuclear power plant loop, and the heart of the nuclear power plant, playing an important role in ensuring the safe circulation of the coolant in the main loop of the nuclear power plant. Among them, the oil mist seal in the bearing chamber is one of the crucial structures, and the stability of its sealing function directly determines the lubricating oil level in the bearing chamber of the main pump motor, thus having an important impact on the long-term safe operation of the main pump motor. Therefore, it is necessary to carry out anti-rust coating on the inner cavity of the oil mist seal, and by applying a layer of oil mist-proof coating, maintain a good oil mist sealing function. However, in order to form a good sealing effect, the oil mist seal is usually designed as a narrow channel to increase the sealing pressure, which poses great difficulties to the production and manufacturing of this component, especially the inner cavity coating process. Conventional means use the paint filling process for coating, but this process cannot ensure good film uniformity, the adhesion is uneven, and the film dropping will block key holes, having a negative impact on the oil mist sealing function. Therefore, it is necessary to develop a suitable coating process equipment and its effective method for the structure of the oil mist seal.

[0003] In order to solve the problem of coating the inner wall of the oil mist seal of the main pump motor, the existing coating process methods usually adopt the paint filling method. Although a coating that meets the coating technical specification can be obtained, new problems are brought in many aspects: First, the paint required usually needs to select single-component paint for coating. If two-component or multi-component paint is used, it is easy to cure during the paint filling process, which is not conducive to forming a film with uniform thickness, and it is easy to block the holes. Second, the paint filling process requires the workpiece to be rotated and the position to be changed, with a lot of operation man-hours and high labor intensity. Otherwise, an electric position-changing device needs to be equipped, which will also increase the coating cost. Third, the procurement cost of single-component paint is relatively high. Therefore, the present invention considers the adverse effects brought by the existing paint filling process and single-component paint, and explores a suitable new coating device and its usage method. Summary of the Invention

[0004] The purpose of the present invention is to: aiming at the above problems, provide a coating device and method for the inner wall of a narrow space, which can eliminate the quality problem of uneven coating thickness caused by the paint filling process of the oil mist seal component of the main pump motor, improve the service life of the oil mist seal component, and maintain the lubricating oil level in the bearing chamber of the main pump motor.

[0005] The technical solution adopted by the present invention is as follows: A painting device for the inner wall of a narrow space, comprising a paint spraying gun device with multiple compressed air chambers, the paint spraying gun device is connected with a suspendable conveying nested hose group, and the conveying nested hose group is respectively connected to the nozzles of each compressed air chamber; a paint atomization and diversion assembly is arranged at the outlet of the conveying nested hose group.

[0006] Optionally, an air inlet channel and multiple compressed air chambers are arranged in the paint spraying gun device, the air inlet channel is communicated with each compressed air chamber, each compressed air chamber is cylindrical, and one end of each compressed air chamber is provided with a joint, and the other end is connected with a control rod through a thread. A knob is arranged at the outer end of the control rod, and the control rod can move along the compressed air chamber through the knob and the thread; a conical end is arranged at the inner end of the control rod, and the conical end acts on the joint.

[0007] Optionally, the conveying nested hose group includes a paint spraying hose, the paint atomization and diversion assembly is arranged at the front end of the paint spraying hose, an external hose is sleeved outside the paint spraying hose, and a first end cap is arranged between the inside of the external hose and the paint spraying hose. The first end cap is located at the front end of the external hose; air spraying holes are further arranged on the outer periphery of the front part of the external hose, and the air spraying holes are arranged around the circumference of the external hose.

[0008] Optionally, the paint spraying hose includes a core hose, the paint atomization and diversion assembly includes an annular support arranged in the core hose, an inclined surface is arranged on the front side of the annular support, a first central part is arranged in the annular support, a conical surface that increases forward is arranged on the front side of the first central part, and a paint mist flow gap is arranged between the annular support and the first central part.

[0009] Optionally, the first central part and the annular support are connected by a thread, and the thread between the first central part and the annular support has at least two sections separated in the circumferential direction, and a gap is arranged between each section of the thread, and this gap is the paint mist flow gap.

[0010] Optionally, the first central part can be adjusted to move along the axial direction of the core hose.

[0011] Optionally, the paint spraying hose includes a core hose and a middle hose nested outside the core hose.

[0012] Optionally, the paint atomization and diversion assembly includes a second central part arranged in the core hose, the second central part has atomization holes, and an arc surface is arranged at the front end of the second central part; a second end cap is further arranged in the middle hose, and an arc surface matching the front end of the second central part is arranged at the rear end of the second end cap; an adjusting screw is arranged in the second end cap, and a paint mist flow gap is arranged between the second end cap and the adjusting screw.

[0013] A painting method for the inner wall of a narrow space, comprising the following steps: S1. Assemble a conveying nested hose group, and connect the starting ends of the multiple conveying nested hoses in the group to the nozzles of the multiple compressed air chambers of the paint spraying gun device respectively; S2. Install a paint atomizing and guiding component at the outlet of the conveying nested hose group; S3. One of the compressed air chambers ventilates the outermost hose of the conveying nested hose group, so that the other end of the conveying nested hose group floats; S4. The remaining compressed air chambers ventilate the inner hoses of the conveying nested hose group, and realize paint spraying through the paint atomizing and guiding component at the other end.

[0014] Optionally, in S4, the conveying nested hose group realizes the siphon effect through the paint atomizing and guiding component, and the paint is sucked out from the small holes of the paint atomizing and guiding component to generate atomization and spraying.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. The painting device and method for the inner wall of a narrow space provided by the present invention meet the requirements of the painting process for the surface of a narrow inner cavity, have wide applicability, and can repair the coating on the space area that cannot be reached by conventional painting tools, especially the inner cavity surface of large equipment that cannot be disassembled and inspected.

[0016] 2. The painting device and method for the inner wall of a narrow space provided by the present invention can adjust for different key painting parameters such as the inner cavity space of different sizes, paint materials of different components, and different temperatures until it fully meets the requirements of the painting process.

[0017] 3. The painting device and method for the inner wall of a narrow space provided by the present invention can ensure that the paint spraying nozzle floats on the center line of the narrow inner cavity, and the sprayed paint mist can cover the 360° side surface in front of the nozzle, ensuring the uniformity of the paint film on each inner cavity surface. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 is a schematic diagram of the connection between the conveying nested hose group and the paint atomizing and guiding component.

[0020] Figure 3 is a schematic diagram of the spraying of the device of the present invention in a narrow inner cavity.

[0021] Figure 4 is a schematic diagram of Embodiment 1.

[0022] Figure 5Schematic diagram of the second embodiment.

[0023] Markings in the figure: 1 - paint spraying gun device, 11 - air inlet passage, 12 - compressed air chamber, 13 - joint, 14 - control rod, 15 - knob, 16 - air valve, 17 - spring, 2 - conveying nested hose group, 21 - paint spraying hose, 211 - core hose, 212 - middle hose, 22 - outer hose, 221 - air spraying hole, 23 - first head, 3 - paint atomization and diversion assembly, 31 - annular support, 32 - first central member, 33 - second central member, 34 - second head, 35 - adjusting screw, 4 - narrow inner cavity, 5 - paint film. Detailed implementation mode

[0024] The present invention will be described in detail below with reference to the accompanying drawings.

[0025] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] A coating device for the inner wall of a narrow space, as Figures 1-5 shown, includes a paint spraying gun device 1 with a plurality of compressed air chambers 12, the paint spraying gun device 1 is connected with a suspendable conveying nested hose group 2, and the conveying nested hose group 2 is respectively connected to the nozzles of each compressed air chamber 12; a paint atomization and diversion assembly 3 is arranged at the outlet of the conveying nested hose group 2.

[0027] The paint spraying gun device 1 serves as a control center, and realizes fine air flow distribution through a plurality of independent compressed air chambers 12: part of the air flow is directly conveyed to the end of the hose for the suspension positioning of the nozzle; part of the air flow pushes the paint liquid from the paint tank into the conveying hose or assists in paint atomization. The conveying nested hose group 2 adopts a multi-layer flexible hose nesting structure, and the air flow sprayed from the outer layer forms an air cushion effect to push the atomization assembly to suspend, so that the nozzle suspends at the central axis of the inner cavity; the inner layer conveys the paint liquid to the end atomization assembly. The flexible nested hose extends to a deep cavity that cannot be reached by conventional tools, and the nozzle automatically suspends in the middle, ensuring that the thickness of the paint film 5 is uniform. The paint atomization and diversion assembly 3 is composed of a group of wear-resistant metal elements and is installed at the end face of the conveying nested hose group 2. The paint liquid is sheared into uniform paint mist and guided to spray onto the inner cavity wall at a specific angle. The high-efficiency atomization mechanism is suitable for high-viscosity two-component paints, reduces the dependence on special paints; avoids the risks of uneven paint film 5 and peeling in the traditional paint filling process, and ensures the long-term safe operation of the main pump of the nuclear power plant.

[0028] In view of the difficulty in implementing the coating of the existing long and narrow inner cavity 4, through reasonable design, the spray port of a conventional spray gun is extended into the narrow inner cavity through a flexible hose, and an atomization mechanism is arranged at the end of the flexible hose, which is beneficial to ensuring the atomization effect and forming a uniform coating on the inner cavity surface. In addition, the flexible hose is set as a multi-layer composite pipe with an inner and outer nesting structure. The inner layer is used to transport the pre-configured paint liquid, and the outer layer is connected to compressed air at the starting end. An exhaust hole is arranged at the end of the hose to ensure that the end of the composite pipe together with the atomization component is suspended on the axis of the long and narrow space under the push of compressed air, ensuring that the paint mist ejected from the end atomization component reaches the inner cavity surface after the same distance.

[0029] As another specific embodiment, an air inlet channel 11 and a plurality of compressed air chambers 12 are provided inside the spray gun device 1. The air inlet channel 11 is connected to each compressed air chamber 12. Each compressed air chamber 12 is cylindrical, and a joint 13 is provided at one end of each compressed air chamber 12, and a control rod 14 is connected to the other end through a thread. A knob 15 is provided at the outer end of the control rod 14. The control rod 14 can move along the compressed air chamber 12 through the knob 15 and the thread. A tapered end is provided at the inner end of the control rod 14, and the tapered end acts on the joint 13.

[0030] Each compressed air chamber 12 independently controls the airflow of different functions. Each air chamber corresponds to an independent knob 15, and the on-off and flow rate of different air paths can be adjusted separately. When the knob 15 is rotated, the tapered tip of the control rod 14 approaches or moves away from the outlet of the joint 13. When the tapered tip presses the outlet of the joint 13, the air path is closed, and when the tapered tip moves away from the outlet of the joint 13, the air path is opened. The size of the gap determines the flow rate of the compressed air. By precisely controlling the suspension airflow, it is ensured that the nozzle is always located on the axis of the inner cavity, so that the paint mist evenly covers the inner wall 360°, solving the problem of uneven coating in the long and narrow space. Further, a trigger is also provided on the spray gun device 1. The trigger is linked to the air inlet channel 11 through an air valve 16. When the trigger is pressed, the air valve opens, and the air inlet channel 11 starts to intake air. A spring 17 is provided on the control rod 14 to push the threads to fit tightly together, reducing air leakage between the threads.

[0031] As another specific embodiment, the conveying nested hose group 2 includes a spray paint hose 21. The paint atomization and diversion assembly 3 is arranged at the front end of the spray paint hose 21. An outer hose 22 is sleeved outside the spray paint hose 21. A first head 23 is provided between the inside of the outer hose 22 and the spray paint hose 21. The first head 23 is located at the front end of the outer hose 22. Spray holes 221 are also provided on the outer periphery of the front part of the outer hose 22. The spray holes 221 are arranged around the circumference of the outer hose 22.

[0032] The paint spraying hose 21 serves as the core channel for paint delivery. Its flexible design allows it to penetrate into the narrow and long cavity along a curved path. The smooth inner wall material reduces paint residue, ensuring efficient delivery of the paint liquid to the front-end atomization component. The paint atomization and diversion component 3 shears the paint liquid into uniform droplets. The outer hose 22 forms an annular compressed air channel, delivering the suspended positioning air flow to the front-end air injection holes 221; at the same time, it physically isolates the paint spraying hose 21 to prevent frictional damage to the cavity or paint contamination of the air path. The first end cap 23 seals the annular air path channel, forcing the compressed air to be ejected only from the air injection holes 221; it cooperates with the air injection holes 221 to form a high-pressure air cushion base, providing a stable suspension thrust. The circumferential air injection holes 221 are designed with a porous and uniform distribution to eject an annular and uniform air curtain, generating a symmetric reaction force to suspend the atomization component at the axis of the cavity. Among them, the air injection holes 221 are provided with multiple fine holes for ejecting the compressed air flow. The air injection holes 221 and the first end cap 23 cooperate to generate a directional high-pressure air cushion, automatically adjusting the atomization component to the center line of the cavity, and avoiding the problem of uneven thickness of the paint film 5 caused by eccentricity from the source. An opening is made at the center of the first end cap 23, and the circumference is flanged. The flange of the first end cap 23 is embedded between the paint spraying hose 21 and the outer air hose, forming a seal for the outer air hose. Preferably, a hoop is added to the outer surface of the end of the outer hose to increase the firmness of the first end cap 23 and improve the resistance to the impact of compressed air.

[0033] As another specific embodiment, the paint spraying hose 21 includes a core hose 211. The paint atomization and diversion component 3 includes an annular support 31 disposed inside the core hose 211. The front side of the annular support 31 has an inclined surface. Inside the annular support 31, there is a first central member 32. The front side of the first central member 32 has a tapered surface that increases forward. There is a paint mist flow gap between the annular support 31 and the first central member 32. Certain taper angles are provided on the inner surfaces at both ends of the annular support 31 to reduce the flow resistance of the paint liquid and the wear of the annular support 31, and to form the spraying angle of the paint mist. The inclined surface on the front side of the annular support 31 cooperates with the tapered surface of the first central member 32 to form a converging-diverging flow channel, accelerating the shearing atomization of the paint liquid; this flow channel is continuous at 360° around the axis of the support and the central member, enabling 360° dead-angle-free spraying of the nozzle. The paint mist flow gap allows paint particles to pass through. Among them, a paint pot is provided between the input end of the core hose 211 and the compressed air chamber 12. The paint pot has a short inlet and a long outlet, and the air flow direction is towards the paint liquid tank, thereby pushing the paint liquid into the core hose 211 to avoid the seal failure of the paint film 5 caused by air bubbles mixing in.

[0034] As another specific embodiment, the first central member 32 and the annular support member 31 are connected by threads. The threads between the first central member 32 and the annular support member 31 have at least two circumferentially separated segments, and there is a gap between each segment of the threads. This gap is the paint mist flow gap. The multiple segments of threads provide a uniform locking force, ensuring that the first central member 32 and the support member are strictly coaxial, and avoiding uneven paint film 5 caused by the deviation of the atomization gap. The physical gap between the threads forms a pre-mixing chamber for paint liquid and compressed air, and the air flow penetrates into the paint liquid flow in advance, improving the subsequent atomization efficiency.

[0035] As another specific embodiment, the first central member 32 can be axially moved and adjusted along the axial direction of the core hose 211. By axially moving the first central member 32, the gap between its conical surface and the inclined surface of the support member can be accurately adjusted. For high-viscosity coatings, the gap is reduced to enhance the shear force, and for low-viscosity coatings, the gap is increased to avoid dry spraying defects caused by excessive atomization. Among them, the first central member 32 has a slotted head, and through the axially adjusting assembly of the slotted head, the device does not need to be taken out.

[0036] As another specific embodiment, the paint spraying hose 21 includes a core hose 211 and a middle hose 212 nested outside the core hose 211. Different from the previous method, in this method, the middle hose 212 constructs a secondary gas-liquid isolation layer between the core hose 211 and the external hose 22, and forms an annular paint liquid buffer channel with the core hose 211, reducing the conveying resistance of high-viscosity coatings.

[0037] As another specific embodiment, the coating atomization and diversion assembly 3 includes a second central member 33 disposed inside the core hose 211. The second central member 33 has atomization holes, and the front end of the second central member 33 has an arc surface. A second end cap 34 is further disposed inside the middle hose 212. The rear end of the second end cap 34 is provided with an arc surface matching the front end of the second central member 33. An adjustment screw 35 is disposed inside the second end cap 34, and there is a paint mist flow gap between the second end cap 34 and the adjustment screw 35. The second central member 33 is designed for high-viscosity two-component coatings, and the small-aperture shear force forces the paint liquid to be preliminarily atomized. Rear arc surface: precisely matches the arc surface of the second central member 33 to form a tapered air flow gap. The adjustment screw 35 is similar to the above-mentioned first central member 32, and the symmetric external thread engages with the intermittent internal thread of the second end cap 34 to adjust the gap by screwing in / out. The conical diversion and the inner conical surface of the second end cap 34 form an annular atomization gap to shear the paint liquid into micron-sized particles. Compressed air is ejected at high speed through the gap between the second end cap 34 and the adjustment screw 35 to suck the paint liquid flowing out of the atomization holes. Among them, the second end cap 34 and the adjustment screw 35 are also connected by threads. The threads between the second end cap 34 and the adjustment screw 35 have at least two sections separated circumferentially, and there is a gap between each section of the threads, and this gap is the paint mist flow gap. The adjustment screw 35 can be axially moved and adjusted along the core hose 211.

[0038] A method for coating the inner wall of a narrow space includes the following steps: S1. Connect the multiple starting ends of the conveying nested hose group 2 to the nozzles of the multiple compressed air chambers 12 of the paint spraying gun device 1 respectively; S2. Install the coating atomization and diversion assembly 3 at the outlet of the conveying nested hose group 2; S3. One of the compressed air chambers 12 ventilates the outermost hose of the conveying nested hose group 2 to make the other end of the conveying nested hose group 2 float; S4. The remaining compressed air chambers 12 ventilate the inner hoses of the conveying nested hose group 2 and realize paint spraying through the coating atomization and diversion assembly 3 at the other end.

[0039] Inject controllable air flow into the outermost hose through the dedicated compressed air chamber 12 to form a directional jet air flow at the end of the nested hose, generating a reverse thrust to make the nozzle assembly stably suspended at the center of the inner cavity axis. The independent compressed air chamber 12 separately controls different functional air flows to achieve fine adjustment of key parameters. The multiple air flows do not interfere with each other, significantly reducing the dependence on single-component coatings. Two-component coatings with stronger adhesion can be selected to extend the equipment life. The nozzle floats relying on the air flow, and there is no risk of scraping the inner wall during the retraction process, protecting the integrity of the formed paint film 5. Fine-tune the position of the nozzle before construction to avoid paint waste caused by repeated test spraying.

[0040] As another specific embodiment, in S4, the nested hose group 2 is conveyed to achieve the siphon effect through the paint atomization and diversion assembly 3, and the paint is sucked out from the small holes of the paint atomization and diversion assembly 3 to generate atomization and ejection. When the trigger is pulled, when the compressed air in the middle hose sprays out at high speed through the conical gap between the adjusting screw 35 and the second end cap 34, a local vacuum area is formed at the outlet of the atomization holes of the second central member 33. A huge pressure difference is formed between the normal pressure of the paint can and the negative pressure area of the atomization holes, forcing the paint liquid to move from the core hose 211 to the atomization holes, realizing self-priming conveyance without a mechanical pump.

[0041] Embodiment 1 For paints with low viscosity, single-component paints, or paints with good dilutability: Step 1: Step 1.1: Pass the core hose 211 with an inner diameter of Ø5 and an outer diameter of Ø6 through the outer hose 22 with an inner diameter of Ø6 and an outer diameter of Ø8 to form a composite hose with nested sizes. Step 1.2: Connect the starting ends of the core hose 211 and the outer hose 22 to the nozzles of the two compressed air chambers 12 of the paint spraying gun device 1 respectively.

[0042] Step 2: Step 2.1: The outer circumferential surface of the annular support member 31 has M5.2 threads, and the inner circumferential surface has M3.6 internal threads; install the annular support member 31 on the end face of the core hose 211, and connect the threads on the outer circumferential surface of the annular support member 31 to the inner circumferential surface of the core hose 211. Step 2.2: Install the first central member 32 on the internal threads of the annular support member 31. The external threads of the first central member 32 form a tight fit with the internal threads of the annular support member 31, and a cross-shaped groove is provided on the end face of the first central member 32 to adjust the relative relationship between the first central member 32 and the annular support member 31, especially the gap formed between the two. Optionally, the external threads of the first central member 32 are not continuous along the circumferential surface, but four discontinuous external threads, and are symmetrically arranged around the axis of the first central member 32.

[0043] Step 3: Step 3.1: Put the outlet end of the nested hose group 2 into the long and narrow inner cavity 4 through the reserved screw hole of the long and narrow inner cavity 4, and at the same time put the endoscope into the long and narrow inner cavity 4 as well. Step 3.2: Push the endoscope to the position where the paint atomization and diversion assembly 3 is located to facilitate observing the paint atomization and diversion assembly 3. Step 3.3: Introduce compressed air into the pipeline of the outer hose 22, and adjust the air flow rate of the compressed air to adjust the position of the paint atomization and diversion assembly 3 in the long and narrow inner cavity 4. Step 3.4: When the position of the paint atomization and diversion assembly 3 is adjusted to the axis of the narrow inner cavity, fix the air flow rate and slowly withdraw the endoscope.

[0044] Step 4 Step 4.1: Turn on the compressed air in the core hose 211 through the paint spraying gun device 1. The air flow goes to the paint pot to push the paint into the core hose 211, and a relatively large pressure is formed near the atomization assembly at the end, realizing the atomization and spraying of the paint to form a uniform paint film 5. Step 4.2: Slowly withdraw the pipeline. The paint mist is continuously sprayed on the surface of the passing inner cavity following the paint atomization and diversion assembly 3 to form a uniform paint film 5 until the pipeline is completely withdrawn from the inner cavity.

[0045] Embodiment 2 For paints with high viscosity, two-component or multi-component paints, or paints with poor dilutability: To adapt to high-viscosity two-component paints or multi-component paints, reduce the use of organic solvents, and improve the environmental protection effect of painting construction, an intermediate layer sleeve needs to be added in the middle of the core hose 211 and the outer hose in the coating device of the present invention, and a paint atomization and diversion assembly 3 with a siphon effect is installed at the end of the core sleeve.

[0046] Step 1 1.1: Pass a core hose 211 with an inner diameter of Ø5 and an outer diameter of Ø6 through a middle hose 212 with an inner diameter of Ø6 and an outer diameter of Ø8, and then pass the double-layer sleeve through an outer hose 22 with an inner diameter of Ø8 and an outer diameter of Ø10 to form a nested hose containing three types of hoses. 1.2: Connect the starting ends of the core hose 211, the middle hose 212, and the outer hose 22 to the nozzles of the three compressed air chambers 12 of the paint spraying gun device 1 respectively. Step 2 2.1: Install a second central part 33 on the end face of the core hose 211. A Ø1.2 small hole is provided in the center of the second central part 33, and waist-shaped small holes are evenly arranged around the small hole.

[0047] 2.2: Part of the outer cylindrical surface of the core hose 211 is installed inside the middle hose. 2.3: Continue to install a second end cap 34 inside the middle layer hose. A conical hole is provided in the middle of the second end cap 34. 2.4: Install an adjusting screw 35 on the conical hole. Intermittent threads are symmetrically distributed on the conical surface. 2.5: Install a first end cap 23 inside the outer hose. A circular light hole is provided in the middle of the first end cap 23.

[0048] Step 3 Step 3.1: Place the outlet end of the conveying nested hose group 2 into the long and narrow inner cavity 4 through the reserved screw hole of the long and narrow inner cavity 4. At the same time, place the endoscope into the long and narrow inner cavity 4 as well. Step 3.2: Push the endoscope to the position where the paint atomization and diversion assembly 3 is located to facilitate the observation of the paint atomization and diversion assembly 3. Step 3.3: Introduce compressed air into the pipeline of the external hose 22 and adjust the air flow rate of the compressed air to adjust the position of the paint atomization and diversion assembly 3 in the long and narrow inner cavity 4. Step 3.4: When the position of the paint atomization and diversion assembly 3 is adjusted to the axis of the narrow inner cavity, fix the air flow rate and slowly withdraw the endoscope.

[0049] Step 4 Step 4.1: Turn on the compressed air in the intermediate layer hose through the paint spray gun and form a siphon effect near the second central member 33 of the core hose 211. The paint is sucked out from the hole to generate atomization and sprays out from the paint mist flow gap of the central hole of the second head 34 on the intermediate hose to form a uniform paint film 5. Step 4.2: Slowly withdraw the pipeline, and the paint mist continuously sprays on the surface of the passing inner cavity following the paint atomization and diversion assembly 3 to form a uniform paint film 5 until the pipeline is completely withdrawn from the inner cavity.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. The present invention extends to any new feature or any new combination disclosed in this specification, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the detailed technical features not disclosed in this embodiment, such as the specific structure, are all prior art, and those skilled in the art can obtain them from the prior art; the connection method can be a fixed connection, a detachable connection, or an integral one; it can be a fixed connection, a movable connection, or a hinged connection, and can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific manner of the above terms in the embodiments of the present invention can be understood according to specific circumstances, and the present disclosure embodiments do not make specific limitations on this.

Claims

1. A coating device for the inner wall of a narrow space, characterized in that: It includes a paint spraying gun device (1) with multiple compressed air chambers (12). The paint spraying gun device (1) is connected to a suspendable conveying nested hose group (2), and the conveying nested hose group (2) is respectively connected to the nozzles of each compressed air chamber (12). A paint atomization and diversion assembly (3) is arranged at the outlet of the conveying nested hose group (2).

2. The inner wall coating device for a narrow space according to claim 1, characterized in that: An air inlet passage (11) and multiple compressed air chambers (12) are provided in the paint spraying gun device (1). The air inlet passage (11) communicates with each compressed air chamber (12). Each compressed air chamber (12) is cylindrical, and a joint (13) is provided at one end of each compressed air chamber (12), and a control rod (14) is connected to the other end by a thread. A knob (15) is provided at the outer end of the control rod (14). The control rod (14) can move along the compressed air chamber (12) through the knob (15) and the thread. A conical end is provided at the inner end of the control rod (14), and the conical end acts on the joint (13).

3. The inner wall coating device for narrow spaces according to claim 2, characterized in that: The conveying nested hose group (2) includes a paint spraying hose (21). The paint atomization and diversion assembly (3) is arranged at the front end of the paint spraying hose (21). An outer hose (22) is sleeved outside the paint spraying hose (21). A first end cap (23) is provided between the inside of the outer hose (22) and the paint spraying hose (21), and the first end cap (23) is located at the front end of the outer hose (22). Spray holes (221) are further provided on the outer periphery of the front part of the outer hose (22), and the spray holes (221) are arranged around the circumference of the outer hose (22).

4. The inner wall coating device for narrow spaces according to claim 3, characterized in that: The paint spraying hose (21) includes a core hose (211). The paint atomization and diversion assembly (3) includes an annular support member (31) arranged in the core hose (211). An inclined surface is provided on the front side of the annular support member (31). A first central member (32) is provided inside the annular support member (31). A conical surface that increases forward is provided on the front side of the first central member (32). A paint mist flow gap is provided between the annular support member (31) and the first central member (32).

5. The inner wall coating device for narrow spaces according to claim 4, characterized in that: The first central member (32) and the annular support member (31) are connected by a thread. The thread between the first central member (32) and the annular support member (31) has at least two sections separated circumferentially, and there is a gap between each section of the thread, and this gap is the paint mist flow gap.

6. The inner wall coating device for narrow spaces according to claim 4, characterized in that: The first central member (32) can move axially along the core hose (211) for adjustment.

7. The inner wall coating device for narrow spaces according to claim 3, characterized in that: The paint spraying hose (21) includes a core hose (211) and a middle hose (212) nested outside the core hose (211).

8. The inner wall coating device for narrow spaces according to claim 7, characterized in that: The paint atomization and diversion assembly (3) includes a second central member (33) disposed inside the core hose (211). The second central member (33) has atomization holes, and the front end of the second central member (33) has an arc surface. A second end cap (34) is further disposed inside the middle hose (212). The rear end of the second end cap (34) has an arc surface matching the front end of the second central member (33). An adjustment screw (35) is disposed inside the second end cap (34), and there is a paint mist flow gap between the second end cap (34) and the adjustment screw (35).

9. A coating method for the inner wall of a narrow and long space, characterized in that: Using the device according to any one of claims 1-8, comprising the following steps: S1. Assemble the conveying nested hose group (2), and connect the plurality of starting ends of the conveying nested hose group (2) to the nozzles of the plurality of compressed air chambers (12) of the paint spraying gun device (1) respectively; S2. Install the paint atomization and diversion assembly (3) at the outlet of the conveying nested hose group (2); S3. One of the compressed air chambers (12) ventilates the outermost hose of the conveying nested hose group (2) to make the other end of the conveying nested hose group (2) float; S4. The remaining compressed air chambers (12) ventilate the inner hoses of the conveying nested hose group (2), and paint spraying is achieved through the paint atomization and diversion assembly (3) at the other end.

10. The method for coating the inner wall of a narrow space according to claim 9, characterized in that: In S4, the conveying nested hose group (2) realizes the siphon effect through the paint atomization and diversion assembly (3), and the paint is sucked out from the small holes of the paint atomization and diversion assembly (3) to generate atomization and be sprayed out.

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