Inner wall spraying mechanism for alloy steel pipe

Abstract

The invention belongs to the technical field of inner wall spraying, and discloses an alloy steel pipe inner wall spraying mechanism which comprises a rack, a limiting groove is formed outside the rack, a supporting frame is slidably connected to the interior of the rack, a moving mechanism is installed outside the rack, an adjusting mechanism is fixed to the exterior of the supporting frame, and a limiting mechanism is arranged at one end of the rack. According to the alloy steel pipe inner wall spraying device, through cooperation of a sleeve, a third electric motor, a gear and other structures, uniform spraying of the inner wall of an alloy steel pipe can be achieved through the device, the coating quality is improved, spraying materials are conveyed to the sleeve through a connecting pipe and the corrugated pipe, and the spraying efficiency is improved; and a third electric motor drives a gear to rotate, and the sleeve, the spraying seat and the spraying rods are driven to rotate synchronously through gear meshing, so that the atomized spraying material is uniformly covered in the circumferential direction of the inner wall of the steel pipe, and the problem of spraying blind areas or uneven thickness is avoided.

Description

Technical Field

[0001] This invention belongs to the field of internal wall spraying technology, specifically an internal wall spraying mechanism for alloy steel pipes. Background Technology

[0002] Alloy steel pipes, with their superior properties such as high strength, corrosion resistance, and high temperature resistance, have been widely used in many fields such as petrochemicals, power engineering, aerospace, and machinery manufacturing. In actual service, the inner wall of alloy steel pipes is often in direct contact with the transported medium, making them susceptible to various destructive effects such as erosion, corrosion, and wear. This can lead to a shortened service life of the pipeline and even cause safety accidents such as leaks and ruptures, resulting not only in economic losses but also potentially serious environmental hazards and safety risks. Therefore, spraying the inner wall of alloy steel pipes to form a protective coating has become a key technical means to improve their service life and safety performance.

[0003] CN111299040A discloses a spraying device for the inner wall of a steel pipe, comprising a base plate, a plurality of V-shaped steel pipe mounting seats fixed on one side of the base plate, and a positioning seat fixed on the other side of the base plate. The device is characterized by: positioning holes formed on the positioning seat; a guide tube formed on the positioning seat; an end cap fixed to the end of the guide tube; a guide head fixed above the positioning seat; a rectangular tube inserted into the guide head; a cap formed at one end of the rectangular tube near the steel pipe mounting seat; a spraying pipe inserted and fixed to the cap of the rectangular tube; the spraying pipe being inserted into the rectangular tube; a spherical nozzle extending out of the rectangular tube at one end; a plurality of spray holes formed on the outer wall of the nozzle; an external thread formed on the outer wall of the spraying pipe inside the rectangular tube; an internally threaded sleeve screwed onto the spraying pipe; the internally threaded sleeve being inserted into the rectangular tube; and an impeller fixed at one end of the internally threaded sleeve extending out of the rectangular tube.

[0004] The device is used by inserting the spray tube into the alloy steel pipe for spraying. However, the spraying length is limited by the length of the spray tube. If the alloy steel pipe is too long, the device cannot effectively spray the inside of the alloy steel pipe. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention provides an inner wall spraying mechanism for alloy steel pipes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an inner wall spraying mechanism for alloy steel pipes, comprising a frame, a limiting groove formed on the outside of the frame, a support frame slidably connected inside the frame, a moving mechanism installed on the outside of the frame, an adjusting mechanism fixed on the outside of the support frame, a connecting pipe provided at one end of the frame, a limiting mechanism provided at one end of the frame, a corrugated pipe fixed inside the frame, and a spraying mechanism installed inside the support frame; The moving mechanism includes a first link, a first travel wheel, and a first electric motor. The first link is hinged to the outside of the frame, and one end of the first link is rotatably connected to the first travel wheel. The first electric motor is fixed to the outside of the first link. The adjustment mechanism includes a limit seat, a limit block, and a cylinder. The limit seat is fixed to the outside of the support frame, the limit block is fixed to the outside of the limit seat, and the cylinder is fixed to the outside of the frame.

[0007] Preferably, the support frame is externally hinged with a second connecting rod, one end of which is rotatably connected to a second travel wheel, and a second electric motor is fixed externally to the second connecting rod. The first and second connecting rods are arranged in three sets, and the first and second connecting rods are arranged in a circular array about the central axis of the frame.

[0008] Preferably, there are two sets of limiting seats, which are symmetrically distributed about the central axis of the limiting block. There are three sets of limiting blocks, which are arranged in a ring array about the central axis of the support frame. The diameter of the limiting block is equal to the width of the limiting groove.

[0009] Preferably, the limiting mechanism includes a limiting rod, a limiting cylinder, and a return spring. The limiting rod is slidably connected inside the frame. The limiting cylinder is fixed at the bottom end of the limiting rod. The return spring is sleeved on the outside of the limiting rod. A pull rod is fixed at the top end of the limiting rod.

[0010] Preferably, three sets of limiting rods and limiting cylinders are provided, and the limiting rods and limiting cylinders are arranged in a circular array about the central axis of the frame. The outer wall of the limiting cylinder is attached to the inner wall of the frame, and the limiting cylinder and the connecting pipe are slidably connected.

[0011] Preferably, three sets of return springs are provided, which are used to compress the limiting cylinder and the limiting rod and keep them moving towards the connecting tube.

[0012] Preferably, the spraying mechanism includes a sleeve, a third electric motor, and gears. The sleeve is fitted onto the output end of the corrugated pipe. The third electric motor is fixed inside the support frame, and a gear is fixed to the rotating end of the third electric motor. A spraying seat is fixed to the output end of the sleeve, and a spraying rod is fixed to the outside of the spraying seat. The third electric motor drives the gear, which in turn rotates the sleeve, spraying seat, and spraying rod. The rotation of the two sets of spraying rods avoids blind spots and uneven thickness. The sleeve fits onto the corrugated pipe, which is flexible and allows the device to move along the steel pipe, meeting the requirements for long-distance continuous spraying. The gear meshing transmission has high efficiency and low loss. The mechanism is integrated into the support frame, making it compact and suitable for the narrow environment inside the steel pipe. The spraying seat diverts the spray material to two sets of symmetrical spraying rods, expanding the coverage area, reducing the frequency of device movement, and balancing the spraying pressure.

[0013] Preferably, the outer wall of the sleeve is fixed with several sets of teeth, which are arranged at equal intervals about the central axis of the sleeve, and the sleeve and the gear are meshed together.

[0014] Preferably, the output end of the sleeve is connected to a spraying base, the output end of the spraying base is connected to a spraying rod, and two sets of spraying rods are provided, the spraying rods being symmetrically distributed about the central axis of the spraying base.

[0015] Preferably, the limiting grooves are provided in six sets, and the limiting grooves are arranged at equal intervals about the central axis of the frame, and the output end of the connecting pipe is connected to a corrugated pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the combination of a sleeve, a third electric motor, gears, and other structures, enables the device to achieve uniform spraying of the inner wall of alloy steel pipes, improving coating quality. The spray material is transported to the sleeve via a connecting pipe and a corrugated pipe, and then distributed to two sets of symmetrical spray rods through a spraying seat for atomization. The third electric motor drives the gears to rotate, and through gear meshing, the sleeve, spraying seat, and spray rods rotate synchronously, so that the atomized spray material uniformly covers the inner wall of the steel pipe in a circumferential direction, avoiding problems such as blind spots or uneven thickness.

[0017] This invention, through the coordinated arrangement of a first connecting rod, a first traveling wheel, and a first electric motor, enables the device to move autonomously along the inner wall of an alloy steel pipe, adapting to the spraying requirements of steel pipes of different lengths. After the first and second connecting rods of the three sets of annular arrays are deployed, the first and second traveling wheels fit against the inner wall of the steel pipe. The first and second electric motors drive the traveling wheels to rotate, causing the entire device to move axially along the steel pipe. Combined with a flexible corrugated pipe to deliver the spray material, this invention breaks through the length limitations of traditional fixed spray pipes, enabling continuous spraying of the inner wall of long-distance steel pipes.

[0018] This invention, through the combination of a limiting seat, a limiting block, and a cylinder, enables the device to adapt to alloy steel pipes of different inner diameters, enhancing its versatility. The cylinder's extension and retraction cause the support frame to slide along the machine frame, and the limiting block moves and positions itself along the limiting groove. This, in turn, adjusts the unfolding angle of the first and second connecting rods, ensuring that the first and second traveling wheels are always in close contact with the inner walls of steel pipes of different inner diameters. At the same time, it ensures that the center of the device is aligned with the central axis of the steel pipe, thus ensuring spraying accuracy.

[0019] This invention, through the combination of a limiting rod, a limiting cylinder, and a return spring, enables the device to achieve a stable connection between the connecting pipe and the frame, improving operational safety. During installation, pulling the lever moves the limiting rod and the limiting cylinder upwards. After inserting the connecting pipe, releasing the lever causes the return spring to push the limiting cylinder into the slot of the connecting pipe to complete the fixation. The three sets of ring-shaped limiting structures form a multi-locking mechanism, requiring multiple people to operate in conjunction to disassemble, thus avoiding the safety hazards caused by single-person misoperation leading to connection detachment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall right-side structure of the present invention; Figure 3 This is a schematic diagram of the adjustment mechanism structure of the present invention; Figure 4 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged cross-sectional view of a portion of point A in the middle section; Figure 6 For the present invention Figure 4 Enlarged cross-sectional view of section B in the middle section; Figure 7 For the present invention Figure 4 Enlarged cross-sectional view of section C.

[0021] In the diagram: 1. Frame; 2. Limiting groove; 3. Support frame; 4. Moving mechanism; 401. First connecting rod; 402. First traveling wheel; 403. First electric motor; 404. Second connecting rod; 405. Second traveling wheel; 406. Second electric motor; 5. Adjusting mechanism; 501. Limiting seat; 502. Limiting block; 503. Cylinder; 6. Connecting pipe; 7. Limiting mechanism; 701. Limiting rod; 702. Limiting cylinder; 703. Return spring; 704. Pull rod; 8. Bellows; 9. Spraying mechanism; 901. Sleeve; 902. Third electric motor; 903. Gear; 904. Spraying seat; 905. Spraying rod. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1 to 7As shown, the present invention provides an inner wall spraying mechanism for alloy steel pipes, including a frame 1, a limiting groove 2 formed on the outside of the frame 1, a support frame 3 slidably connected inside the frame 1, a moving mechanism 4 installed on the outside of the frame 1, an adjusting mechanism 5 fixed on the outside of the support frame 3, a connecting pipe 6 provided at one end of the frame 1, a limiting mechanism 7 provided at one end of the frame 1, a corrugated pipe 8 fixed inside the frame 1, a spraying mechanism 9 installed inside the support frame 3, six sets of limiting grooves 2 are formed, the limiting grooves 2 are arranged at equal intervals about the central axis of the frame 1, and the output end of the connecting pipe 6 is connected to the corrugated pipe 8.

[0024] like Figures 1 to 5 As shown, the moving mechanism 4 includes a first connecting rod 401, a first traveling wheel 402, and a first electric motor 403. The first connecting rod 401 is hinged to the outside of the frame 1. One end of the first connecting rod 401 is rotatably connected to the first traveling wheel 402. The first electric motor 403 is fixed to the outside of the first connecting rod 401. A second connecting rod 404 is hinged to the outside of the support frame 3. One end of the second connecting rod 404 is rotatably connected to the second traveling wheel 405. A second electric motor 406 is fixed to the outside of the second connecting rod 404. There are three sets of the first connecting rod 401 and the second connecting rod 404. The first connecting rod 401 and the second connecting rod 404 are arranged in a circular array about the central axis of the frame 1.

[0025] like Figures 1 to 5 As shown, the adjustment mechanism 5 includes a limiting seat 501, a limiting block 502, and a cylinder 503. The limiting seat 501 is fixed to the outside of the support frame 3, and the limiting block 502 is fixed to the outside of the limiting seat 501. The cylinder 503 is fixed to the outside of the frame 1. There are two sets of limiting seats 501, which are symmetrically distributed about the central axis of the limiting block 502. There are three sets of limiting blocks 502, which are arranged in a ring array about the central axis of the support frame 3. The diameter of the limiting block 502 is equal to the width of the limiting groove 2.

[0026] The above solution involves connecting and fixing the connecting pipe 6 to the frame 1, placing the entire device inside the alloy steel pipe, and extending and retracting the cylinder 503 to move the positions of the limiting seat 501, the limiting block 502, and the support frame 3. This changes the distance between the support frame 3 and the frame 1, causing the first connecting rod 401 and the second connecting rod 404 to unfold, bringing the first traveling wheel 402 and the second traveling wheel 405 into contact with the inner wall of the alloy steel pipe. Because of the three sets of first connecting rods 401 and second connecting rods 404, the device can remain on the central axis of the alloy steel pipe. The device then moves by rotating the first traveling wheel 402 and the second traveling wheel 405 by starting the first electric motor 403 and the second electric motor 406.

[0027] like Figures 1 to 7As shown, the limiting mechanism 7 includes a limiting rod 701, a limiting cylinder 702, and a return spring 703. The limiting rod 701 is slidably connected inside the frame 1. The limiting cylinder 702 is fixed at the bottom end of the limiting rod 701. The return spring 703 is sleeved on the outside of the limiting rod 701. A pull rod 704 is fixed at the top end of the limiting rod 701. There are three sets of limiting rods 701 and limiting cylinders 702. The limiting rods 701 and limiting cylinders 702 are arranged in a circular array about the central axis of the frame 1. The outer wall of the limiting cylinder 702 is attached to the inner wall of the frame 1. The limiting cylinder 702 is slidably connected to the connecting pipe 6. There are three sets of return springs 703. The return springs 703 are used to squeeze the limiting cylinder 702 and the limiting rod 701 and keep them moving towards the connecting pipe 6.

[0028] The above solution involves two people pulling multiple sets of levers 704 when inserting the connecting pipe 6 into the frame 1, so that the connecting pipe 6 can be inserted into the connector of the frame 1. After the connecting pipe 6 is inserted, the two people release their grip, allowing the three sets of limiting cylinders 702 to be inserted into the slots opened on the outside of the connecting pipe 6 by the restoring force of the return spring 703, thereby fixing the connecting pipe 6 in place. This makes it impossible for a single person to remove the connecting pipe 6 and the frame 1.

[0029] like Figures 1 to 6 As shown, the spraying mechanism 9 includes a sleeve 901, a third electric motor 902, and a gear 903. The sleeve 901 is fitted onto the output end of the bellows 8. The third electric motor 902 is fixed inside the support frame 3. The gear 903 is fixed to the rotating end of the third electric motor 902. Several sets of teeth are fixed to the outer wall of the sleeve 901. The teeth are arranged at equal intervals about the central axis of the sleeve 901. The sleeve 901 and the gear 903 are meshed together. A spraying seat 904 is fixed to the output end of the sleeve 901. A spraying rod 905 is fixed to the outside of the spraying seat 904. The output end of the sleeve 901 is connected to the spraying seat 904. The output end of the spraying seat 904 is connected to the spraying rod 905. Two sets of spraying rods 905 are provided. The spraying rods 905 are symmetrically distributed about the central axis of the spraying seat 904.

[0030] The above scheme is adopted as follows: After connecting the connecting pipe 6 to the frame 1, the spray material is conveyed into the interior of the corrugated pipe 8 through the connecting pipe 6 and the frame 1, and then conveyed into the interior of the sleeve 901 and the spraying seat 904 through the corrugated pipe 8. After that, it is atomized and sprayed onto the inner wall of the alloy steel pipe through the spraying rod 905. At the same time, the third electric motor 902 is started to drive the gear 903 to rotate, and then the gear 903 drives the sleeve 901, the spraying seat 904 and the spraying rod 905 to rotate, so that the spray material rotates.

[0031] The working principle and usage process of this invention are as follows: First, when the connecting pipe 6 is inserted into the frame 1, two people need to pull multiple sets of pull rods 704 so that the connecting pipe 6 can be inserted into the joint of the frame 1. After the connecting pipe 6 is inserted, the two people release their hands, so that the three sets of limiting cylinders 702 are inserted into the slots opened on the outside of the connecting pipe 6 by the restoring force of the return spring 703, thereby fixing the connecting pipe 6. This makes it impossible for a single person to remove the connecting pipe 6 and the frame 1, ensuring the safety of the device operation and spraying. At this time, the length of the flexible end of the connecting pipe 6 can be used to accommodate alloy steel pipes of different lengths.

[0032] Secondly, after connecting and fixing the connecting pipe 6 to the frame 1, the entire device is placed inside the alloy steel pipe. The cylinder 503 is activated to extend and retract, thereby moving the positions of the limiting seat 501, the limiting block 502, and the support frame 3. This changes the distance between the support frame 3 and the frame 1, causing the first connecting rod 401 and the second connecting rod 404 to unfold. This brings the first traveling wheel 402 and the second traveling wheel 405 into contact with the inner wall of the alloy steel pipe. Because there are three sets of first connecting rods 401 and second connecting rods 404, the device can be kept on the central axis of the alloy steel pipe. By activating the first electric motor 403 and the second electric motor 406, the first traveling wheel 402 and the second traveling wheel 405 are rotated, thereby moving the entire device. This allows for moving spraying of the interior of alloy steel pipes of different lengths.

[0033] Finally, after connecting the connecting pipe 6 to the frame 1, the spray material is conveyed into the interior of the corrugated pipe 8 through the connecting pipe 6 and the frame 1, and then conveyed into the interior of the sleeve 901 and the spraying seat 904 through the corrugated pipe 8. After being atomized and sprayed onto the inner wall of the alloy steel pipe by the spraying rod 905, the third electric motor 902 is started to drive the gear 903 to rotate. In turn, the gear 903 drives the sleeve 901, the spraying seat 904 and the spraying rod 905 to rotate, so that the spray material rotates, thereby enabling uniform spraying of the inner wall of the alloy steel pipe.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An inner wall spraying mechanism for alloy steel pipes, comprising a frame (1), characterized in that: The frame (1) has a limiting groove (2) on its outside, a support frame (3) is slidably connected inside the frame (1), a moving mechanism (4) is installed on the outside of the frame (1), an adjusting mechanism (5) is fixed on the outside of the support frame (3), a connecting pipe (6) is provided at one end of the frame (1), a limiting mechanism (7) is provided at one end of the frame (1), a corrugated pipe (8) is fixed inside the frame (1), and a spraying mechanism (9) is installed inside the support frame (3). The moving mechanism (4) includes a first link (401), a first traveling wheel (402) and a first electric motor (403). The first link (401) is hinged to the outside of the frame (1). One end of the first link (401) is rotatably connected to the first traveling wheel (402). The first electric motor (403) is fixed to the outside of the first link (401). The adjustment mechanism (5) includes a limiting seat (501), a limiting block (502) and a cylinder (503). The limiting seat (501) is fixed to the outside of the support frame (3), the limiting block (502) is fixed to the outside of the limiting seat (501), and the cylinder (503) is fixed to the outside of the frame (1).

2. The inner wall spraying mechanism for alloy steel pipes according to claim 1, characterized in that: The support frame (3) is externally hinged with a second connecting rod (404), one end of which is rotatably connected to a second traveling wheel (405). A second electric motor (406) is fixed externally to the second connecting rod (404). The first connecting rod (401) and the second connecting rod (404) are arranged in three sets, and the first connecting rod (401) and the second connecting rod (404) are arranged in a circular array about the central axis of the frame (1).

3. The inner wall spraying mechanism for alloy steel pipes according to claim 1, characterized in that: Two sets of limiting seats (501) are provided. The limiting seats (501) are symmetrically distributed about the central axis of the limiting block (502). Three sets of limiting blocks (502) are provided. The limiting blocks (502) are arranged in a ring array about the central axis of the support frame (3). The diameter of the limiting block (502) is equal to the width of the limiting groove (2).

4. The inner wall spraying mechanism for alloy steel pipes according to claim 1, characterized in that: The limiting mechanism (7) includes a limiting rod (701), a limiting cylinder (702), and a return spring (703). The limiting rod (701) is slidably connected inside the frame (1). The limiting cylinder (702) is fixed at the bottom end of the limiting rod (701). The return spring (703) is sleeved on the outside of the limiting rod (701). A pull rod (704) is fixed at the top end of the limiting rod (701).

5. The inner wall spraying mechanism for alloy steel pipes according to claim 4, characterized in that: The limiting rod (701) and the limiting cylinder (702) are provided in three sets. The limiting rod (701) and the limiting cylinder (702) are arranged in a ring array about the central axis of the frame (1). The outer wall of the limiting cylinder (702) is attached to the inner wall of the frame (1). The limiting cylinder (702) and the connecting pipe (6) are slidably connected.

6. The inner wall spraying mechanism for alloy steel pipes according to claim 4, characterized in that: The reset spring (703) is provided in three sets. The reset spring (703) is used to squeeze the limiting cylinder (702) and the limiting rod (701) and keep them moving towards the connecting tube (6).

7. The inner wall spraying mechanism for alloy steel pipes according to claim 1, characterized in that: The spraying mechanism (9) includes a sleeve (901), a third electric motor (902) and a gear (903). The sleeve (901) is fitted onto the output end of the bellows (8). The third electric motor (902) is fixed inside the support frame (3). The gear (903) is fixed to the rotating end of the third electric motor (902). The spraying base (904) is fixed to the output end of the sleeve (901). The spraying rod (905) is fixed to the outside of the spraying base (904).

8. The inner wall spraying mechanism for alloy steel pipes according to claim 7, characterized in that: The outer wall of the sleeve (901) is fixed with several sets of teeth, which are arranged at equal intervals about the central axis of the sleeve (901). The sleeve (901) and the gear (903) are meshed and connected.

9. The inner wall spraying mechanism for alloy steel pipes according to claim 7, characterized in that: The output end of the sleeve (901) is connected to the spraying base (904), and the output end of the spraying base (904) is connected to the spraying rod (905). There are two sets of spraying rods (905), and the spraying rods (905) are symmetrically distributed about the central axis of the spraying base (904).

10. The inner wall spraying mechanism for alloy steel pipes according to claim 1, characterized in that: The limiting groove (2) has six sets, and the limiting groove (2) is arranged at equal intervals about the central axis of the frame (1). The output end of the connecting pipe (6) is connected to the corrugated pipe (8).

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