Pipeline inner wall spraying device

Abstract

According to the pipeline inner wall spraying device, a fixing assembly in lap joint with the inner wall of a pipeline is arranged on the surface of the side, close to a spraying assembly, of a bearing rod, the fixing assembly comprises an outer fixing part and an inner fixing part, and the outer fixing part expands outwards on the outer portion of the bearing rod to abut against the inner wall of the pipeline; the inner fixing part extends out of an inner cavity of the bearing pipe and abuts against the inner wall of the pipeline, and the expanding stroke of the outer fixing part is larger than that of the inner fixing part. The driving part sequentially triggers the inner fixing part and the outer fixing part to be unfolded, the current pipe diameter can be automatically judged according to the stroke and resistance changes, the corresponding supporting mode is selected, and the self-locking type pipe connector can be quickly self-locked in a small-diameter pipe and can be stably supported and fixed in a large-diameter pipe. In this way, self-adaptive installation of the pipelines of multiple specifications is achieved, and the stability and the operation efficiency of the spraying device are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of pipeline spraying, specifically to a pipeline inner wall spraying device. Background Technology

[0002] In the maintenance of non-core pipelines in nuclear power plants, some process sections use small-diameter metal pipes, whose inner walls often require spraying or repair. However, existing small-scale spraying equipment generally faces difficulties in placement and fixation within such narrow pipes. The traveling mechanism typically used for pipeline spraying employs a three-jaw support structure, using the radial expansion of the three claws to position and limit the spraying device. However, when the pipe diameter is small, the three-jaw structure often contacts the pipe wall before fully expanding to the optimal force-bearing angle, resulting in insufficient effective support and affecting the equipment's normal stability and spraying accuracy. To adapt the three-jaw structure to small-diameter pipes, the size of the three-jaw structure must be reduced accordingly, but this makes it difficult to provide the necessary support in medium or large-diameter pipes, significantly reducing the applicability of the spraying equipment.

[0003] Furthermore, existing support structures typically rely on single-section deployment mechanisms with limited working stroke. When the pipe diameter does not match the support range set by the structure, deployment either fails to occur smoothly or a stable contact cannot be established, resulting in unreliable installation of the spraying device. These single-support mechanisms generally lack adaptability to different pipe diameters, requiring frequent replacement of different models of support mechanisms during the maintenance of multi-specification pipelines, which not only increases operational complexity but also affects overall construction efficiency.

[0004] Therefore, there is an urgent need for a fixing device that can be reliably deployed in small and medium diameter pipes, has multi-level support capabilities, and can automatically switch support modes according to pipe diameter, so as to improve the compatibility and stability of spraying equipment in pipes of different specifications.

[0005] Therefore, a pipe inner wall spraying device is provided to address the above problems. Summary of the Invention

[0006] In order to solve the problem of poor internal coating of small-diameter metal pipes in the prior art, the present invention provides a pipe inner wall coating device.

[0007] The present invention solves the above-mentioned technical problems through the following technical solutions: The present invention provides a pipe inner wall spraying device, including a hollow support rod, with a spraying component for an external pump body and a handle at each end of the support rod, and the handle is fixed to the outer wall of the support rod; A fixing component is provided on the surface of the support rod near the spraying assembly to overlap with the inner wall of the pipe. The fixing component includes an outer fixing part and an inner fixing part. The outer fixing part extends outward from the outside of the support rod to abut against the inner wall of the pipe, and the inner fixing part extends out from the inner cavity of the support tube to abut against the inner wall of the pipe. The extension stroke of the outer fixing part is greater than that of the inner fixing part. That is, the inner fixing part can be used to install the entire device inside the pipe with a smaller diameter, while the outer fixing part can install the entire device inside the pipe with a larger diameter. While ensuring that the entire device can enter the small diameter pipe, the adaptability of the spraying device to pipes of different diameters is further increased. It also includes a drive assembly that is also mounted on the support rod. The drive assembly is located on the side near the grip handle. The drive assembly drives the drive component to pass sequentially through the trigger end of the inner fixing part and the trigger end of the outer fixing part, pushing the inner fixing part or the outer fixing part to unfold. The moving drive component stops at the trigger end of the inner fixing part or the trigger end of the outer fixing part it triggers.

[0008] In this technical solution, the external fixing part includes three external fixing units arranged in a ring array, and the external fixing units are mounted on the bearing rod. Each external fixing unit includes an external support rod, one end of which is rotatably connected to the outer wall of the bearing rod, and the other end is provided with a first traveling wheel. The first traveling wheel contacts the inner wall of the pipe. A first coil spring is provided at the rotatable connection between the external support rod and the bearing rod, and the two ends of the first coil spring are respectively connected to the external support rod and the bearing rod. One end of the push rod is rotatably connected to the outer wall of the middle area of ​​the bearing rod, and the other end of the push rod is rotatably connected to the outer wall of the sliding ring. The sliding ring is slidably connected to the bearing rod and is connected to the transmission part inside the bearing rod through the moving through groove. The transmission part is the trigger end of the external fixed part.

[0009] When the driving component passes the inner driving part and moves to the transmission part at the trigger end of the outer fixed part, it pushes the transmission part to move away from the driving component, thereby pushing the sliding ring to move synchronously. The moving sliding ring pushes the rod to move, thereby pushing the outer support rod to rotate outward, so that the outer fixed part unfolds until the first traveling wheel on the end of the outer support rod touches the inner wall of the pipe, thereby completing the installation of the spraying device through the unfolded outer fixed part.

[0010] In this technical solution, the transmission part includes a synchronizing rod, which has a "Z" shaped structure. The synchronizing rod passes through the side wall of the bearing rod via a movable through groove. The two ends of the synchronizing rod are fixedly connected to a sliding ring and a driven ring, respectively. The driven ring is the trigger end of the outer fixed part.

[0011] The driving component pushes the driven ring to move, thereby driving the entire external fixing part to unfold.

[0012] A first spring is sleeved on the bearing rod on one side of the sliding ring, and the two ends of the first spring are connected to the sliding ring and the bearing rod respectively.

[0013] In this technical solution, the internal fixing part includes three internal fixing units arranged in a ring array. Each internal fixing unit includes a sliding rod distributed radially along the bearing rod. The sliding rod passes through the side wall of the bearing rod and is slidably connected to the guide sleeve on the side wall of the bearing rod. A mounting plate is fixed to the end of the sliding rod away from the center of the bearing cavity, and a second traveling wheel is provided on the mounting plate to overlap with the inner wall of the pipe; The other end of the sliding rod is provided with a pulley protruding from its end. The pulley is the trigger end of the inner fixed part, and an initial space is left between the three pulleys for the end of the driving component to pass through. A second spring is fitted onto the surface of the sliding rod, and the two ends of the second spring are respectively connected to the side wall of the sliding rod and the bearing rod or the sliding sleeve.

[0014] Preferably, the projections of the three external fixing units and the three internal fixing units on the axial direction of the bearing rod coincide, and the mounting plate on the end of the sliding rod passes through the corresponding external support rod.

[0015] That is, the sliding rod and the mounting plate pass through the outer support rod. Furthermore, the through slot area on the outer support rod must be large enough to avoid interference when the outer support rod rotates.

[0016] In this technical solution, the driving component includes a movable rod disposed on the central axis of the bearing rod, and a guide rod is fixed on the end of the movable rod near the driving assembly. The guide rod is slidably connected inside the guide shell, and the guide shell is fixed to the inner wall of the bearing rod by the rod. Three drive blocks arranged in a circular array are fixed on the surface of the moving rod. The outer wall of the drive block is inclined towards the side closer to the drive assembly to form a drive ramp. The three drive ramps in motion respectively connect with the pulleys on the ends of the three sliding rods. The other end of the moving rod is connected to the drive assembly via a connecting part.

[0017] During the movement of the moving rod, the guide rod always slides inside the guide housing, and the third spring deforms.

[0018] In this technical solution, the connecting part includes a first connecting rope. One end of the first connecting rope is connected to the end of the moving rod, and the other end passes through the driven ring and is fixedly connected to the center of the first adapter plate. Multiple branch ropes are fixed on the surface of the first adapter plate. The ends of the branch ropes pass around the guide wheel and extend to one side of the drive assembly, and are fixedly connected to the second adapter plate. The transmission direction of the connecting part is changed by the guide wheel. The guide wheel is fixed on the inner wall of the bearing rod cavity. The branch ropes and the sliding rod are arranged alternately. A second connecting rope is fixed at the center of the outer wall on the other side of the second adapter plate, and the second connecting rope is connected to the drive assembly for transmission.

[0019] Multiple branch ropes between the first and second adapter plates can improve the stability of the drive assembly when it pulls the moving rod.

[0020] The drive assembly pulls the second connecting rope to one side, changing the transmission direction through the guide wheel, causing the moving rod to be pulled away from the drive assembly.

[0021] In this technical solution, the drive assembly includes a mounting shell, which is fixed to the outer wall of the support rod and communicates with the inner cavity of the support rod. The interior of the mounting shell is provided with a self-rotating winding wheel, and the second connecting rope is wound on the winding wheel. The top of the winding wheel extends into the inner cavity of the support rod. The winding reel is equipped with a check valve with a release function and a crank handle on both sides.

[0022] A rotating shaft is fixed at the center of the outer wall on both sides of the winding reel. A mounting bracket is sleeved on the surface of the rotating shaft. The mounting bracket is fixed on the inner wall of the mounting shell. A disc spring is sleeved on the rotating shaft. The two ends of the disc spring are connected to the rotating shaft and the inner wall of the mounting shell, respectively. The anti-return part includes a ratchet, which is fixed on one of the rotating shafts. The crank is fixed on another rotating shaft that passes through the side wall of the mounting housing and is concentric with the rotating shaft. A pawl is provided on one side of the ratchet and engages with it. The pawl is rotatably connected to the connecting frame. The engagement of the ratchet and the pawl allows the winding wheel to rotate only in the direction of winding. A second coil spring is provided at the rotatable connection between the pawl and the connecting frame, and the two ends of the second coil spring are fixed to the pawl and the connecting frame respectively. The connecting frame is fixed to the transmission rod, which passes through the side wall of the mounting shell and is slidably connected to the inside of the sleeve on the side wall of the mounting shell. A gripping cylinder is fixed on the end of the transmission rod located on the outside of the mounting shell. When the second coil spring does not deform, the pawl engages with the rotating ratchet. A fourth spring is fitted onto the surface of the transmission rod, and the two ends of the fourth spring are fixed to the transmission rod and the sleeve, respectively.

[0023] The drive rod is positioned along the axial direction of the winding reel. The crank handle has a "Z" shaped structure.

[0024] In this technical solution, the spraying assembly is mounted on the fixed housing, which is fixed to the end of the support rod. A motor is installed in the inner cavity of the fixed housing, and the drive shaft on the drive end of the motor passes through the side wall of the mounting housing and extends to the outside of the fixed housing. The end of the drive shaft is fixed to one end of an "L"-shaped connecting pipe, and the other end of the connecting pipe is fixed with a nozzle. A hollow connecting disc is fitted onto the surface of the connecting pipe. The connecting disc is fixed to the outer wall of the fixed shell by a connecting rod. The connecting pipe and the connecting disc are connected by a through hole. The rotating connection between the connecting pipe and the connecting disc is covered by an outer shell. The outer shell is used to install the rotating sealing structure between the connecting pipe and the connecting disc.

[0025] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0026] The positive and progressive effects of this invention are as follows: By having the moving drive component pass sequentially through the inner and outer fixing parts, a step-by-step triggering and segmented deployment mechanism is formed during actual installation. When the drive component first acts on the inner fixing part, the inner fixing part begins to unfold outward. If the inner fixing part can successfully abut against the inner wall of the pipe within a predetermined short stroke range, a reliable self-locking state will be formed between the inner fixing part and the drive component, thereby immediately completing the fixed installation of the spraying device. This mode is suitable for pipes with small diameters, enabling rapid and stable positioning within the shortest stroke, reducing unnecessary structural movements, and improving installation efficiency.

[0027] Once the drive component continues forward and completely passes through the inner fixing part, it indicates that the inner fixing part is fully open but has not yet contacted the inner wall of the pipe, meaning the current pipe diameter is larger than the applicable range of the inner fixing part. In this case, the drive component continues to move axially and begins to trigger the deployment of the outer fixing part. The outer fixing part provides support over a wider range of strokes and eventually forms a stable contact with the inner wall of the pipe, thus completing the installation of the spraying device. The outer fixing part has a greater deployment capacity and compensation range, enabling it to adapt to a wider range of pipe diameters, thereby ensuring stable operation of the equipment in pipes of different sizes.

[0028] The moving drive unit itself has a detection function. By monitoring changes in stroke position, deployment status, and applied resistance, it can identify and attempt to trigger the inner and outer fixed parts throughout the entire process, from small to large strokes. Using this mechanical detection capability, the drive unit can automatically determine whether the current pipe diameter is within the effective deployment range of the inner fixed part. If the condition is not met, it continues moving and switches to the deployment stage of the outer fixed part. This "step-by-step trial + automatic judgment" arrangement allows the spraying device to adaptively fix pipes of different diameters without manual pre-adjustment, improving compatibility and operational reliability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the structure with fixed components on the load-bearing part; Figure 3 For the present invention Figure 1 A schematic diagram of the structure viewed from below; Figure 4 For the present invention Figure 1 A top-view structural diagram; Figure 5For the present invention Figure 4 Schematic diagram of the cross-sectional structure at point AA; Figure 6 For the present invention Figure 5 A structural diagram showing the portion with fixed components; Figure 7 For the present invention Figure 1 Schematic diagram of the structure after the concealed load-bearing rod is removed; Figure 8 This is a schematic diagram of the structure of the fixing component of the present invention; Figure 9 For the present invention Figure 8 A structural diagram from another perspective; Figure 10 This is a schematic diagram of the structure of the driving component of the present invention; Figure 11 For the present invention Figure 10 A structural diagram from another perspective; Figure 12 This is a schematic diagram of the structure of the check valve of the present invention; Figure 13 This is a schematic diagram of the structure of the spraying assembly of the present invention; Figure 14 For the present invention Figure 13 Internal structure diagram; Figure 15 This is a schematic diagram of the structure of the driving component, the inner fixing part, and the transmission part of the present invention; Figure 16 For the present invention Figure 15 A structural diagram from another perspective; Figure 17 This is a schematic diagram of the structure of the external support rod of the present invention with a first traveling wheel.

[0030] Explanation of reference numerals in the attached figures 1. Supporting rod; 11. Moving through groove; 2. Hold the handle; 3. Drive assembly; 31. Mounting housing; 32. Rewinding wheel; 33. Rotating shaft; 34. Mounting bracket; 35. Handle; 36. Ratchet; 37. Pad; 371. Connecting frame; 38. Drive rod; 381. Sleeve; 39. Grip sleeve; 4. Fixing Components; 41. External Fixing Unit; 411. External Support Rod; 4111. First Traveling Wheel; 412. Push Rod; 413. Sliding Ring; 42. Internal Fixing Unit; 421. Sliding Rod; 422. Guide Sleeve; 423. Mounting Plate; 424. Second Traveling Wheel; 425. Pulley; 43. Driving Component; 431. Moving Rod; 432. Driving Block; 4321. Driving Inclined Surface; 433. Guide Rod; 44. First Connecting Rope; 45. First Adapter Plate; 46. Branch Rope; 47. Guide Wheel; 48. Transmission Unit; 481. Transmission Unit; 482. Synchronizing Rod; 49. Second Adapter Plate; 491. Second Connecting Rope; 5. Fixed shell; 6. Spraying assembly; 61. Motor; 62. Drive shaft; 63. Connecting disc; 64. Outer casing; 65. Connecting pipe; 651. Through hole; 66. Spray nozzle; 67. Connecting rod. Detailed Implementation

[0031] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0032] like Figure 1 and Figure 3 As shown, a pipe inner wall spraying device includes a hollow support rod 1, with a spraying assembly 6 for an external pump body and a handle 2 respectively provided at both ends of the support rod 1, and the handle 2 is fixed to the outer wall of the support rod 1. A fixing component 4 is provided on the surface of the support rod 1 near the spraying component 6, which overlaps with the inner wall of the pipe. The fixing component 4 includes an outer fixing part and an inner fixing part. The outer fixing part extends outward from the outside of the support rod 1 and abuts against the inner wall of the pipe. The inner fixing part extends outward from the inner cavity of the support tube and abuts against the inner wall of the pipe. The extension stroke of the outer fixing part is greater than that of the inner fixing part. That is, the inner fixing part can be used to install the entire device inside the pipe with a smaller diameter, while the outer fixing part can install the entire device inside the pipe with a larger diameter. On the basis of ensuring that the entire device can enter the small diameter pipe, the adaptability of the spraying device to pipes of different diameters is further increased. It also includes a drive assembly 3, which is also set on the support rod 1. The drive assembly 3 is set on the side near the grip handle 2. The drive assembly 3 drives the drive member 43 to pass through the trigger end of the inner fixing part and the trigger end of the outer fixing part in sequence, pushing the inner fixing part or the outer fixing part to unfold. The moving drive member 43 stops at the trigger end of the inner fixing part or the trigger end of the outer fixing part it triggers.

[0033] The driving member 43 first passes through the inner fixed part. When the pipe diameter is small, the moving driving member 43 pushes the inner fixed part to unfold and abut against the inner wall of the pipe, thus stopping at the inner fixed part. When the driving member 43 passes through the inner fixed part and the inner fixed part is fully unfolded but still does not abut against the inner wall of the pipe, the driving member 43 passes over the inner fixed part and pushes the outer fixed part to unfold, so that the unfolded outer fixed part abuts against the inner wall of the pipe, and the driving member 43 stops at the outer fixed part.

[0034] Specifically, the moving drive component 43 first passes through the inner fixing part and then the outer fixing part. When the drive component 43 pushes the inner fixing part to unfold, and the unfolded inner fixing part abuts against the inner wall of the pipe, a self-locking mechanism is formed between the drive component 43 and the inner fixing part, thus completing the installation of the spraying device. When the drive component 43 has completely passed through the inner fixing part, it means that the inner fixing part has been fully unfolded, but it has not yet abutted against the inner wall of the pipe, thus failing to form a self-locking mechanism. The continuing movement of the drive component 43 triggers the unfolding of the outer fixing part, which then abuts against the inner wall of the pipe, thereby completing the installation of the spraying device.

[0035] The moving drive 43 has a detection function, and attempts to trigger the internal fixation part and the external fixation part in sequence from small stroke to large stroke.

[0036] like Figure 2 As shown, the external fixing part includes three external fixing units 41 arranged in a ring array, and the external fixing units 41 are mounted on the bearing rod 1. The external fixing unit 41 includes an external support rod 411. One end of the external support rod 411 is rotatably connected to the outer wall of the bearing rod 1, and the other end is provided with a first traveling wheel 4111. The first traveling wheel 4111 contacts the inner wall of the pipe. A first coil spring is provided at the rotatable connection between the external support rod 411 and the bearing rod 1. The two ends of the first coil spring are respectively connected to the external support rod 411 and the bearing rod 1. One end of the push rod 412 is rotatably connected to the outer wall of the middle area of ​​the bearing rod 1. The other end of the push rod 412 is rotatably connected to the outer wall of the sliding ring 413. The sliding ring 413 is slidably connected to the bearing rod 1. The sliding ring 413 is connected to the transmission part 481 inside the bearing rod 1 through the moving through groove 11. The transmission part 481 is the trigger end of the external fixed part.

[0037] When the drive unit 43 passes the inner drive unit and moves to the transmission unit 481 at the trigger end of the outer fixed part, it pushes the transmission unit 481 to move away from the drive assembly 3, thereby pushing the sliding ring 413 to move synchronously. The moving sliding ring 413 pushes the rod 412 to move, thereby pushing the outer support rod 411 to rotate outward, so that the outer fixed part unfolds until the first traveling wheel 4111 on the end of the outer support rod 411 reaches the inner wall of the pipe, thereby completing the installation of the spraying device through the unfolded outer fixed part.

[0038] like Figures 6-9As shown, the transmission part 481 includes a synchronizing rod 482, which has a "Z" shaped structure. The synchronizing rod 482 passes through the side wall of the bearing rod 1 via the movable through slot 11. The two ends of the synchronizing rod 482 are fixedly connected to the sliding ring 413 and the driven ring 481, respectively. The driven ring 481 is the trigger end of the outer fixed part.

[0039] The driving component 43 pushes the driven ring 481 to move, thereby driving the entire outer fixing part to unfold.

[0040] A first spring is sleeved on the bearing rod 1 on one side of the sliding ring 413, and the two ends of the first spring are respectively connected to the sliding ring 413 and the bearing rod 1.

[0041] When the sliding ring 413 is pushed by the synchronizing rod 482, the first spring deforms and accumulates elastic potential energy that allows the sliding ring 413 and the outer support rod 411 to return to their original positions.

[0042] The "Z"-shaped synchronizing rod 482 increases the distance between the trigger ends of the outer and inner fixed parts, preventing the driving component 43 from triggering the outer fixed part before it has completely passed the trigger end of the inner fixed part.

[0043] The internal fixation part includes three internal fixation units 42 arranged in a ring array. Each internal fixation unit 42 includes a sliding rod 421 distributed radially along the support rod 1. The sliding rod 421 passes through the side wall of the support rod 1 and is slidably connected to the guide sleeve 422 on the side wall of the support rod 1. A mounting plate 423 is fixed on the end of the sliding rod 421 away from the center of the bearing cavity, and a second traveling wheel 424 is provided on the mounting plate 423 to overlap with the inner wall of the pipe. The other end of the sliding rod 421 is provided with a pulley 425 protruding from its end. The pulley 425 is the trigger end of the inner fixed part. The initial space is left between the three pulleys 425 for the end of the driving member 43 to pass through. A second spring is fitted onto the surface of the sliding rod 421, and the two ends of the second spring are respectively connected to the sliding rod 421 and the side wall or sliding sleeve of the bearing rod 1.

[0044] The end of the moving drive member 43 first enters between the pulleys 425 at the ends of the three sliding rods 421. The moving drive member 43 gradually pushes the sliding rods 421 outward, so that the sliding rods 421 extend radially outward along the bearing rod 1 until the sliding rods 421 abut against the inner wall of the pipe. During the above process, the second spring deforms.

[0045] Alternatively, after the driving component 43 has completely passed the pulley 425, the second traveling wheel 424 on the end of the sliding rod 421 has not yet come into contact with the inner wall of the pipe. After the driving component 43 has passed, the sliding rod 421 returns to its original position under the elastic force of the second spring's return deformation.

[0046] Preferably, the projections of the three external fixing units 41 and the three internal fixing units 42 on the axial direction of the bearing rod 1 coincide, and the mounting plate 423 on the end of the sliding rod 421 passes through the corresponding external support rod 411.

[0047] That is, the sliding rod 421 and the mounting plate 423 pass through the outer support rod 411. And the area of ​​the through groove opened on the outer support rod 411 should be large enough to avoid interference when the outer support rod 411 rotates.

[0048] like Figure 15 and Figure 16 As shown, preferably, the driving component 43 includes a movable rod 431 disposed on the central axis of the bearing rod 1. A guide rod 433 is fixed on the end of the movable rod 431 near the driving assembly 3. The guide rod 433 is slidably connected inside the guide shell. The guide shell is fixed to the inner wall of the bearing rod 1 by the rod. Three drive blocks 432 arranged in a ring array are fixed on the surface of the moving rod 431. The outer wall of the drive block 432 is inclined towards the side closer to the drive assembly 3 to form a drive slope 4321. The three drive slopes 4321 in motion respectively connect with the pulleys 425 on the ends of the three sliding rods 421. The other end of the moving rod 431 is connected to the drive assembly 3 via a connecting part.

[0049] The drive assembly 3 drives the moving rod 431 and the three drive blocks 432 on its surface to move away from the drive assembly 3. The guide rod 433 moves synchronously. When the drive inclined surface 4321 on the drive block 432 moves, it pushes the sliding rod 421 that it is connected to outward, thereby causing the sliding rod 421 to move outward and causing the inner fixed part to unfold.

[0050] Before the pulley 425 disengages from the moving transmission ramp, the second traveling wheel 424 on the inner fixed part abuts against the inner wall of the pipe, and the entire coating device is installed through the inner fixed part.

[0051] After the drive ramp 4321 disengages from the pulley 425, the second traveling wheel 424 has not yet reached the inner wall of the pipe, so the stroke of the inner fixed part is insufficient, and the drive block 432 continues to move with the moving rod 431.

[0052] After passing through the inner fixing part, the moving rod 431 and the driving block 432 continue to move until they reach the driven ring 481. The moving rod 431 enters the inner ring of the driven ring 481, and the driving inclined surface 4321 on the driving block 432 is stuck on the side wall of the inner ring of the driven ring 481, thereby pushing the driven ring 481 to move synchronously, causing the outer support rod 411 to rotate outward until the first traveling wheel 4111 touches the inner wall of the pipe.

[0053] A third spring is sleeved on the surface of the guide rod 433, and the two ends of the third spring are respectively connected to the guide rod 433 and the guide shell.

[0054] During the movement of the moving rod 431, the guide rod 433 always slides inside the guide shell, and the third spring deforms.

[0055] like Figure 8 and Figure 9 As shown, the connecting part includes a first connecting rope 44. One end of the first connecting rope 44 is connected to the end of the moving rod 431, and the other end passes through the driven ring 481 and is fixedly connected to the center of the first adapter plate 45. Multiple branch ropes 46 are fixed on the surface of the first adapter plate 45. The ends of the branch ropes 46 pass around the guide wheel 47 and extend to one side of the drive assembly 3, and are fixedly connected to the second adapter plate 49. The transmission direction of the connecting part is changed by the guide wheel 47. The guide wheel 47 is fixed on the inner wall of the bearing rod 1. The branch ropes 46 and the sliding rod 421 are arranged alternately. A second connecting rope 491 is fixed at the center of the outer wall on the other side of the second adapter plate 49, and the second connecting rope 491 is connected to the drive assembly 3 for transmission.

[0056] Multiple branch ropes 46 between the first adapter plate 45 and the second adapter plate 49 can improve the stability of the drive assembly 3 when it pulls the moving rod 431 to move.

[0057] The drive assembly 3 pulls the second connecting rope 491 to one side, and changes the transmission direction through the guide wheel 47, so that the moving rod 431 is pulled to move away from the drive assembly 3.

[0058] like Figures 10-12 As shown, the drive assembly 3 includes a mounting shell 31, which is fixed to the outer wall of the support rod 1 and communicates with the inner cavity of the support rod 1. The interior of the mounting shell 31 is provided with a self-rotating winding wheel 32, and the second connecting rope 491 is wound on the winding wheel 32. The top of the winding wheel 32 extends into the inner cavity of the support rod 1. The winding reel 32 is provided with a check valve with a release function and a crank handle 35 on both sides.

[0059] A rotating shaft 33 is fixed at the center of the outer wall on both sides of the winding reel 32. A mounting bracket 34 is sleeved on the surface of the rotating shaft 33. The mounting bracket 34 is fixed on the inner wall of the mounting shell 31. A coil spring is sleeved on the rotating shaft 33. The two ends of the coil spring are connected to the rotating shaft 33 and the inner wall of the mounting shell 31, respectively. The anti-return part includes a ratchet 36, which is fixed on one of the rotating shafts 33. The crank 35 is fixed on another rotating shaft 33 that passes through the side wall of the mounting housing 31 and is concentric with the rotating shaft 33. A pawl 37 that engages with the ratchet 36 is provided on one side. The pawl 37 is rotatably connected to the connecting frame 371. The engagement of the ratchet 36 and the pawl 37 makes the winding wheel 32 rotate only in the direction of winding. A second coil spring is provided at the rotatable connection between the pawl 37 and the connecting frame 371, with both ends of the second coil spring fixed to the pawl 37 and the connecting frame 371 respectively. The connecting frame 371 is fixed to the transmission rod 38, which passes through the side wall of the mounting housing 31 and is slidably connected inside the sleeve 381 on the side wall of the mounting housing 31. A gripping cylinder 39 is fixed to the end of the transmission rod 38 located on the outside of the mounting housing 31. When the second coil spring does not deform, the pawl 37 engages with the rotating ratchet 36, and the position of the pawl 37 is... Figure 12 The location shown; A fourth spring is sleeved on the surface of the transmission rod 38, and the two ends of the fourth spring are fixed to the transmission rod 38 and the sleeve 381 respectively.

[0060] The drive rod 38 is arranged along the axial direction of the winding reel 32. The crank handle 35 has a "Z" shaped structure.

[0061] Hold the crossbar on the outside of the crank handle 35 and turn the handle 35. The crank handle 35 drives the take-up reel 32 to rotate, thereby winding up the second connecting rope 491. During the winding of the second connecting rope 491, the drive component 43 is pulled to move away from the drive assembly 3. During the above process, the coil spring deforms. During winding, the engagement between the ratchet 36 and the pawl 37 prevents the take-up reel 32 from rotating to the unwinding direction. When the inner or outer fixing part abuts against the inner wall of the pipe, the engagement between the ratchet 36 and the ratchet tooth forms a self-locking mechanism, thereby completing the fixation of the spraying device.

[0062] When it is necessary to release the unfolded state of the external and internal fixing parts, the transmission rod 38 is pulled outward by the gripping cylinder 39, thereby driving the transmission rod 38, the connecting frame 371 and the pawl 37 on the connecting frame 371 to move outward. The fourth spring deforms, causing the pawl 37 to be misaligned with the ratchet 36. Under the elastic force of the coil spring, the spring and the coil spring to restore their deformation, each component returns to its original position.

[0063] Then release the gripping cylinder 39, and under the elastic force of the fourth spring restoring its deformation, the pawl 37 returns to its original position.

[0064] The tension between the third spring and the coil spring keeps the first connecting rope 44, the second connecting rope 491, and the branch rope 46 taut at all times.

[0065] The spraying assembly 6 is mounted on the fixed housing 5, which is fixed to the end of the support rod 1. A motor 61 is installed in the inner cavity of the fixed housing 5, and the drive shaft 62 on the drive end of the motor 61 passes through the side wall of the mounting housing 31 and extends to the outside of the fixed housing 5. The end of the drive shaft 62 is fixed to one end of the "L"-shaped connecting pipe 65, and the other end of the connecting pipe 65 is fixed with a nozzle 66. like Figure 13 and Figure 14 As shown, a hollow connecting disc 63 is fitted onto the surface of the connecting pipe 65. The connecting disc 63 is fixed to the outer wall of the fixed housing 5 by a connecting rod 67. The connecting pipe 65 and the connecting disc 63 are connected by a through hole 651. The rotatable connection between the connecting pipe 65 and the connecting disc 63 is covered by an outer cover 64. The outer cover 64 is used to install the rotatable sealing structure between the connecting pipe 65 and the connecting disc 63.

[0066] The rotary sealing structure in this application is a pre-existing sealing structure used to seal the connection between the connecting pipe 65 and the connecting disc 63 when the connecting pipe 65 rotates, preventing paint leakage. An interface is provided on the surface of the connecting disc 63, through which a feed pipe for connecting to an external pump body is connected.

[0067] During spraying, hold the entire spraying device by gripping handle 2, then insert the end with the spraying component 6 into the inner cavity of the pipe, and turn the crank handle 35 to drive the take-up wheel 32 to rotate until the inner or outer fixing part abuts against the inner cavity of the pipe. Then start the pump body and motor 61. The pump body pumps the paint through the guide pipe into the connecting plate 63, thereby pumping it into the connecting pipe 65, and spraying it out from the nozzle 66.

[0068] Motor 61 drives connecting pipe 65 to rotate, utilizing the "L"-shaped structure of connecting pipe 65 to achieve 360° spraying of the pipe wall. During the spraying process, by holding handle 2 and pulling the entire bearing rod 1 outward at a uniform speed, the spraying of the inner wall of the pipe is completed.

[0069] The first traveling wheel 4111 or the second traveling wheel 424 makes the movement of the bearing rod 1 in the pipe smoother.

[0070] To avoid obstructing the view of the first traveling wheel 4111 and affecting the illustration, the attached diagram in the instruction manual is not included. Figures 1-16 In the figures with external support rods 411, the first traveling wheel 4111 is not shown.

[0071] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A pipe inner wall spraying device, comprising a hollow support rod (1), wherein a spraying assembly (6) for an external pump body and a gripping handle (2) are respectively provided at both ends of the support rod (1), and the gripping handle (2) is fixed on the outer wall of the support rod (1), characterized in that: The surface of the support rod (1) near the spraying assembly (6) is provided with a fixing assembly (4) that overlaps with the inner wall of the pipe. The fixing assembly (4) includes an outer fixing part and an inner fixing part. The outer fixing part extends outward from the outside of the support rod (1) and abuts against the inner wall of the pipe. The inner fixing part extends out of the inner cavity of the support tube and abuts against the inner wall of the pipe. The extension stroke of the outer fixing part is greater than that of the inner fixing part. It also includes a drive assembly (3) set on the support rod (1). The drive assembly (3) drives the drive member (43) to pass through the trigger end of the inner fixing part and the trigger end of the outer fixing part in sequence, pushing the inner fixing part or the outer fixing part to unfold. The moving drive member (43) stops at the trigger end of the inner fixing part or the trigger end of the outer fixing part it triggers.

2. The pipe inner wall spraying device as described in claim 1, characterized in that: The external fixing part includes three external fixing units (41) arranged in a ring array. Each external fixing unit (41) includes an external support rod (411). One end of the external support rod (411) is rotatably connected to the outer wall of the bearing rod (1), and the other end is provided with a first traveling wheel (4111). A first coil spring is provided at the rotatable connection between the external support rod (411) and the bearing rod (1). One end of the push rod (412) is rotatably connected to the outer wall of the middle area of ​​the bearing rod (1), and the other end of the push rod (412) is rotatably connected to the outer wall of the sliding ring (413). The sliding ring (413) is slidably connected to the bearing rod (1). The sliding ring (413) is connected to the transmission part (481) inside the bearing rod (1) through the moving through groove (11), and the transmission part (481) is the trigger end of the external fixed part.

3. The pipe inner wall spraying device as described in claim 2, characterized in that: The transmission part (481) includes a synchronizing rod (482), which has a "Z" shaped structure. The synchronizing rod (482) passes through the side wall of the bearing rod (1) through the moving through groove (11). The two ends of the synchronizing rod (482) are fixedly connected to the sliding ring (413) and the driven ring (481) respectively.

4. The pipe inner wall spraying device as described in claim 1, characterized in that: The internal fixation part includes three internal fixation units (42) arranged in a ring array. The internal fixation unit (42) includes a sliding rod (421) radially distributed along the support rod (1). The sliding rod (421) penetrates the side wall of the support rod (1) and is slidably connected to the guide sleeve (422) on the side wall of the support rod (1). The sliding rod (421) is fixed with a mounting plate (423) on the end away from the center of the bearing cavity, and the mounting plate (423) is provided with a second traveling wheel (424) that overlaps with the inner wall of the pipe. A pulley (425) is provided on the other end of the sliding rod (421), and the pulley (425) is the trigger end of the inner fixing part; A second spring is fitted onto the surface of the sliding rod (421).

5. The pipe inner wall spraying device as described in claim 4, characterized in that: The projections of the three external fixing units (41) and the three internal fixing units (42) on the bearing rod (1) coincide, while the mounting plate (423) on the end of the sliding rod (421) passes through the corresponding external support rod (411).

6. A pipe inner wall spraying device as described in claims 2 and 4, characterized in that: The driving component (43) includes a movable rod (431) disposed on the central axis of the bearing rod (1). A guide rod (433) is fixed on the end of the movable rod (431) near the driving assembly (3). The guide rod (433) is slidably connected inside the guide shell. The surface of the moving rod (431) is fixed with three driving blocks (432) arranged in a ring array. The outer wall of the driving block (432) is inclined towards the side closer to the driving assembly (3) to form a driving slope (4321). The three driving slopes (4321) in motion respectively connect with the pulleys (425) on the ends of the three sliding rods (421). The other end of the moving rod (431) is connected to the drive assembly (3) via a connecting part.

7. The pipe inner wall spraying device as described in claim 6, characterized in that: The connecting part includes a first connecting rope (44), one end of which is connected to the end of the moving rod (431), and the other end passes through the driven ring (481) and is fixedly connected to the center of the first adapter plate (45). A plurality of branch ropes (46) are fixed on the surface of the first adapter plate (45). The ends of the branch ropes (46) pass around the guide wheel (47) and extend toward one side of the drive assembly (3), and are fixedly connected to the second adapter plate (49). A second connecting rope (491) is fixed at the center of the outer wall on the other side of the second adapter plate (49), and the second connecting rope (491) is connected to the drive assembly (3) for transmission.

8. The pipe inner wall spraying device as described in claim 7, characterized in that: The drive assembly (3) includes a mounting shell (31) which is fixed to the outer wall of the support rod (1). The mounting shell (31) is provided with a self-rotating winding wheel (32) inside. The second connecting rope (491) is wound on the winding wheel (32), and the top of the winding wheel (32) extends into the inner cavity of the support rod (1). The winding reel (32) is provided with a check valve with a limit release function and a crank handle (35) on both sides respectively. The two outer walls of the take-up reel (32) are each fixed with a spin shaft (33). The surface of the spin shaft (33) is fitted with a mounting bracket (34). The mounting bracket (34) is fixed on the inner wall of the mounting shell (31). A disc spring is fitted on the spin shaft (33). The two ends of the disc spring are connected to the spin shaft (33) and the inner wall of the mounting shell (31) respectively.

9. A pipe inner wall spraying device as described in claim 8, characterized in that: The check valve includes a ratchet (36), which is fixed on one of the rotating shafts (33). The crank handle (35) is fixed on another rotating shaft (33) that passes through the side wall of the mounting housing (31). A pawl (37) is provided on one side of the ratchet (36) and engages with it. The pawl (37) is rotatably connected to the connecting frame (371). The engagement of the ratchet (36) and the pawl (37) makes the winding wheel (32) rotate only in the direction of winding. A second coil spring is provided at the rotatable connection between the pawl (37) and the connecting frame (371), and the two ends of the second coil spring are respectively fixed on the pawl (37) and the connecting frame (371). The connecting frame (371) is fixed on the transmission rod (38). The transmission rod (38) passes through the side wall of the mounting shell (31) and is slidably connected inside the sleeve (381) on the side wall of the mounting shell (31). A gripping cylinder (39) is fixed on the end of the transmission rod (38) located outside the mounting shell (31). The surface of the transmission rod (38) is fitted with a fourth spring, and the two ends of the fourth spring are fixed on the transmission rod (38) and the sleeve (381) respectively.

10. A pipe inner wall spraying device as described in claim 1, characterized in that: The spraying assembly (6) is mounted on the fixed housing (5), which is fixed to the end of the support rod (1). A motor (61) is installed in the inner cavity of the fixed housing (5), and the drive shaft (62) on the drive end of the motor (61) passes through the side wall of the mounting housing (31) and extends to the outside of the fixed housing (5). The end of the drive shaft (62) is fixed to one end of the "L"-shaped connecting pipe (65), and the other end of the connecting pipe (65) is fixed with a nozzle (66). The connecting pipe (65) is fitted with a hollow connecting disc (63) on its surface. The connecting disc (63) is fixed to the outer wall of the fixed shell (5) by a connecting rod (67). The connecting pipe (65) and the connecting disc (63) are connected by a through hole (651). The rotating connection between the connecting pipe (65) and the connecting disc (63) is covered by an outer cover (64). The outer cover (64) is used to install the rotating sealing structure between the connecting pipe (65) and the connecting disc (63).

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