A laser cladding pretreatment device for inner wall of oil well pipe

Abstract

The utility model belongs to the field of oil well pipe processing, concretely relates to an oil well pipe inner wall laser cladding pretreatment device, including center column, tow head and cleaning mechanism, at least three groups of advancing support structures are arranged around the center column array, each group advancing support structure includes support arm and adjusting arm, adjusting arm one end is hinged with support arm middle part, support arm one end is hinged with center column front end, and support arm other end is provided with walking wheel, the adjusting ring is sleeved on the center column, and each adjusting arm other end is hinged with the adjusting ring, the tow head is fixedly arranged in the center column front end, the adjusting ring is provided with the connecting ring, and the adjusting ring moves through the tow connecting ring, and the cleaning mechanism is installed on each support arm.

Description

Technical Field

[0001] This utility model belongs to the field of oil well pipe processing technology, and more specifically, it relates to a laser cladding pretreatment device for the inner wall of oil well pipe. Background Technology

[0002] During oil extraction, well pipes operate in high-temperature, high-pressure, and highly corrosive environments for extended periods. Their inner walls are prone to rust, scaling, and oil buildup, severely impacting the quality of subsequent repair processes such as laser cladding. Laser cladding demands extremely high cleanliness, roughness, and geometric consistency of the substrate surface. The presence of an oil film or oxide layer will lead to insufficient bonding strength or even failure of the cladding layer. Common pretreatment methods for the inner walls include sandblasting, wire brushing, or chemical cleaning, but these often rely on fixed equipment or require frequent replacement of specialized tools adapted to different pipe diameters.

[0003] For oil well pipes that are tens of meters long and have various inner diameter specifications, existing devices generally suffer from problems such as poor pipe diameter adaptability and inability to move independently.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a laser cladding pretreatment device for the inner wall of oil well pipe, in order to achieve a more practical purpose. Utility Model Content

[0005] In view of the problems mentioned in the background art above, this utility model provides a laser cladding pretreatment device for the inner wall of oil well pipe.

[0006] The technical solution adopted by this utility model is as follows: A laser cladding pretreatment device for the inner wall of an oil well pipe includes a central column, a traction head, and a cleaning mechanism. At least three sets of traveling support structures are arranged around the central column array. Each set of traveling support structures includes a support arm and an adjusting arm. One end of the adjusting arm is hinged to the middle of the support arm, and one end of the support arm is hinged to the front end of the central column. The other end of the support arm is provided with a traveling wheel. An adjusting ring is sleeved on the central column, and the other end of each set of adjusting arms is hinged to the adjusting ring. The traction head is fixedly arranged at the front end of the central column, and a connecting ring is provided on the adjusting ring. The adjusting ring is moved by traction of the connecting ring. The cleaning mechanism is installed on each set of support arms.

[0007] Furthermore, the cleaning mechanism includes a tripod fixedly mounted on a support arm, a protective box mounted on the tripod, a motor mounted on the protective box, and a cleaning brush disc rotatably mounted on the protective box, the cleaning brush disc being driven by the motor.

[0008] Furthermore, the bottom of the cleaning brush disc is not higher than the outer end of the walking wheel.

[0009] Furthermore, the traction head is a hollow traction head, with a tension hole at the end of the traction head and a cable inlet at the coaxial location of the traction head and the connecting ring.

[0010] Furthermore, a limit ring is provided near the inlet of the central column.

[0011] The beneficial effects of this utility model are:

[0012] When the adjusting ring is pulled and moves axially along the central column, each adjusting arm applies force to the middle of the support arm, causing the support arm to rotate around its hinge point with the central column, thereby changing the radial extension of the traveling wheels. Because multiple sets of structures are circumferentially distributed and synchronously controlled by the same adjusting ring, each traveling wheel can synchronously adjust to contact the current pipe wall and maintain pressure balance, forming a stable three-point centering support. This mechanical linkage structure requires no external sensors or electrical control; pipe diameter adaptation can be completed solely through the traction adjusting ring. This ensures the axial centering of the device during movement and avoids uneven cleaning or equipment jamming caused by eccentricity, providing a clean inner wall surface with consistent geometric reference for subsequent laser cladding. Attached Figure Description

[0013] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0014] Figure 1 This is a frontal view of the present invention;

[0015] Figure 2 This is a schematic diagram of the rear view angle of this utility model;

[0016] The attached diagram is labeled as follows:

[0017] 1. Central column, 11. Adjusting ring, 12. Connecting ring, 13. Limiting ring, 2. Support arm, 21. Walking wheel, 22. Triangle frame, 23. Protective box, 24. Cleaning brush, 3. Adjusting arm, 4. Traction head, 41. Tension hole, 42. Cable inlet. Detailed Implementation

[0018] like Figures 1-2 As shown, a laser cladding pretreatment device for the inner wall of an oil well pipe includes a central column 1, a traction head 4, and a cleaning mechanism. At least three sets of traveling support structures are arranged in an array around the central column 1. Each set of traveling support structures includes a support arm 2 and an adjusting arm 3. One end of the adjusting arm 3 is hinged to the middle of the support arm 2, and one end of the support arm 2 is hinged to the front end of the central column 1. The other end of the support arm 2 is provided with a traveling wheel 21. An adjusting ring 11 is sleeved on the central column 1, and the other end of each set of adjusting arms 3 is hinged to the adjusting ring 11. The traction head 4 is fixedly installed at the front end of the central column 1, and a connecting ring 12 is provided on the adjusting ring 11. The adjusting ring 11 is moved by traction of the connecting ring 12. The cleaning mechanism is installed on each set of support arms 2.

[0019] Using the above technical solution, when the adjusting ring 11 is pulled and moves axially along the central column 1, each adjusting arm 3 applies force to the middle of the support arm 2, causing the support arm 2 to rotate around its hinge point with the central column 1, thereby changing the radial extension of the traveling wheel 21. Since multiple sets of structures are circumferentially distributed and synchronously controlled by the same adjusting ring 11, each traveling wheel 21 can be synchronously adjusted to contact the current pipe wall and maintain pressure balance, forming a stable three-point centering support. This mechanical linkage structure does not require external sensors or electrical control; pipe diameter adaptation can be completed solely through the traction adjusting ring 11. This ensures the axial centering of the device during movement and avoids uneven cleaning or equipment jamming caused by eccentricity, providing a clean inner wall surface with consistent geometric reference for subsequent laser cladding.

[0020] In practical applications, each hinge point is fitted with a rubber sleeve to prevent contamination; secondly, the traction head 4 is pulled by an external traction mechanism, and the traction cable is connected to the connecting ring 12 on the adjusting ring 11 to ensure that the connecting ring 12 moves under force.

[0021] As a preferred embodiment, the cleaning mechanism includes a tripod 22 fixedly mounted on the support arm 2. A protective box 23 is mounted on the tripod 22, and the protective box 23 is used to mount a motor. A cleaning brush disc 24 is rotatably mounted on the protective box 23, and the cleaning brush disc 24 is driven by the motor. Since the cleaning mechanism is rigidly fixed to the support arm 2 by the tripod 22, and the support arm 2 itself has achieved dynamic contact with the pipe wall through the aforementioned adaptive mechanism, the cleaning brush disc 24 can always maintain a constant contact pressure with the inner wall, ensuring the uniformity of grinding and rust removal.

[0022] As a preferred embodiment, the bottom of the cleaning brush disc 24 is not higher than the outer end of the traveling wheel 21. This ensures that the traveling wheel 21 first interacts with the pipe wall, undertaking the functions of guidance and obstacle crossing. A higher wire brush can be installed on the cleaning brush disc 24 to contact and squeeze against the pipe wall, thereby achieving the cleaning work.

[0023] As a preferred embodiment, the traction head 4 is a hollow traction head 4, with a tension hole 41 at one end and a cable inlet 42 coaxially with the connecting ring 12 on the periphery of the traction head 4. The tension hole 41 is used to connect an external traction rope to enable axial movement of the device within the pipeline.

[0024] As a preferred embodiment, a limiting ring 13 is provided near the inlet 42 of the central column 1. When the traction cable enters the inner cavity of the central column 1 from the inlet 42 of the traction head 4, if there is no guiding limit, it is prone to shifting, knotting, or friction and wear against the inner wall when the device bends or is vibrated.

[0025] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core idea of ​​the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A laser cladding pretreatment device for the inner wall of an oil well pipe, characterized in that: include A central column (1) is surrounded by an array of at least three sets of traveling support structures. Each set of traveling support structures includes a support arm (2) and an adjusting arm (3). One end of the adjusting arm (3) is hinged to the middle of the support arm (2), and one end of the support arm (2) is hinged to the front end of the central column (1). The other end of the support arm (2) is provided with a traveling wheel (21). An adjusting ring (11) is fitted on the central column (1), and the other end of each set of adjusting arms (3) is hinged to the adjusting ring (11). The traction head (4) is fixedly installed at the front end of the central column (1). The adjusting ring (11) is provided with a connecting ring (12). The adjusting ring (11) is moved by pulling the connecting ring (12). A cleaning mechanism is mounted on each set of the support arms (2).

2. The laser cladding pretreatment device for the inner wall of an oil well pipe according to claim 1, characterized in that: The cleaning mechanism includes a tripod (22) fixedly mounted on a support arm (2), a protective box (23) mounted on the tripod (22), the protective box (23) is used to install a motor, and a cleaning brush (24) is rotatably mounted on the protective box (23), the cleaning brush (24) being driven by a motor.

3. The laser cladding pretreatment device for the inner wall of an oil well pipe according to claim 2, characterized in that: The bottom of the cleaning brush (24) is not higher than the outer end of the walking wheel (21).

4. The laser cladding pretreatment device for the inner wall of an oil well pipe according to claim 1, characterized in that: The traction head (4) is a hollow traction head (4), with a tension hole (41) at the end of the traction head (4) and a wire inlet (42) at the coaxial position of the traction head (4) and the connecting ring (12).

5. The laser cladding pretreatment device for the inner wall of an oil well pipe according to claim 4, characterized in that: A limit ring (13) is provided near the inlet (42) of the central column (1).

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