Crack repairing device for inner wall of hard chromium coating pipe fitting

Abstract

The invention discloses a crack repairing device for the inner wall of a hard chromium coating pipe fitting, and the crack repairing device comprises a clamping assembly which comprises a clamping piece, and the pipe fitting can be clamped on the clamping piece in the direction that the inner wall of the pipe fitting is perpendicular to the horizontal plane; the repairing assembly comprises a laser emitting head, and the laser emitting head is used for emitting laser to the inner wall of the pipe so that a transversely-sunken molten pool can be formed in the inner wall of the pipe. According to the device, the clamping piece is vertically arranged, the pipe fitting is vertically clamped, the inner wall of the pipe fitting is made to be perpendicular to the horizontal plane, then the crack position is transversely irradiated through the laser emission head, the crack position is transversely sunken outwards from the surface of the inner wall to form a molten pool, and a solution in the molten pool cannot transversely jump under the combined action of surface tension and gravity of the solution; concave parts and protrusions cannot be formed on the surface of the metal after the molten pool is solidified, and therefore the roughness of the metal surface machined through the laser remelting technology is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipe crack repair, in particular to a crack repair device for the inner wall of a hard chrome plated pipe. Background Art

[0002] For some petrochemical pipelines, in order to improve the hardness, corrosion resistance and wear resistance of the inner wall, a hard chrome coating is usually plated on the inner wall. However, chrome plating is accompanied by hydrogen embrittlement, and the resulting small cracks seriously limit the anti-corrosion life.

[0003] Based on this, in the prior art, cracks are usually repaired by laser remelting technology, such as the record of the patent document with the publication number "CN118272808A", which discloses a composite equipment and process for laser cleaning and cladding of the inner wall of a pipeline. Among them, the composite equipment includes: a platform, having a mounting seat for installing the pipeline; a rotating table, used to drive the pipeline to rotate circumferentially; a support rod, used to be horizontally penetrated in the pipeline and move axially relative to the pipeline; a laser, used to emit a laser beam; a composite repair head, which is arranged on the support rod, including a laser optical path, a turntable, a laser cleaning head and a laser cladding head. The laser optical path is used to transmit the laser beam. The turntable is located on the output side of the laser optical path. The laser cleaning head and the laser cladding head are arranged on the turntable, wherein the turntable can rotate circumferentially and has a first rotation position and a second rotation position relative to the laser optical path. In the first rotation position, the laser cleaning head is aligned with the optical path, and in the second rotation position, the laser cladding head is aligned with the optical path. In this way, the problem that the inner surface of the pipeline cannot be cleaned locally can be solved, which is conducive to improving the cladding quality.

[0004] However, in the above scheme and the prior art, a laser head is used to irradiate the crack to form a molten pool to repair the crack. However, after the molten pool formed by the melting of the metal surface solidifies, its surface tends to form a gold ingot shape with the middle arched upward and the surrounding areas concave downward. The surface roughness is extremely low and cannot meet the processing requirements with high surface accuracy. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a crack repair device for the inner wall of a hard chrome-plated pipe fitting, so as to solve the problem of low roughness of the inner wall of the pipe fitting after laser remelting in the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is a crack repair device for the inner wall of a hard chrome-plated pipe, comprising:

[0007] A clamping assembly, comprising a clamping member, the pipe member can be clamped on the clamping member in a direction in which the inner wall of the pipe member is perpendicular to a horizontal plane;

[0008] A repair component is arranged in the height direction with the clamping component, and the repair component includes a laser emitting head, which is used to emit laser to the inner wall of the pipe fitting to form a transversely depressed molten pool on the inner wall of the pipe fitting; the laser emitting head can slide to different depths in the pipe fitting along the height direction relative to the pipe fitting, and the laser emitting head can be rotated relative to the pipe fitting to different positions facing the same depth in the pipe fitting.

[0009] Furthermore, the clamping member is arranged in a tubular shape, and the clamping member includes a first connecting section and a second connecting section fixed to each other, the inner diameter of the first connecting section is larger than the inner diameter of the second connecting section, so as to form a step surface at the connection between the first connecting section and the second connecting section, and the step surface can be abutted against the bottom of the pipe.

[0010] Furthermore, the inner diameter of the first connecting section is greater than or equal to the outer diameter of the pipe.

[0011] Furthermore, the axial direction of the clamping member is perpendicular to the horizontal plane, and the step surface is parallel to or coincides with the horizontal plane.

[0012] Furthermore, it also includes a fixed stand, and the repair component is installed on the fixed stand;

[0013] A rotating motor is arranged on the fixed stand, and the clamping member is connected to the rotating motor.

[0014] Furthermore, the repair component also includes a fixed frame connected to the fixed platform, and a slide rail arranged along the vertical direction is provided on the fixed frame, a slider is slidably provided on the slide rail, and the laser transmitter head is arranged on the slider.

[0015] Furthermore, a detection unit is also provided on the fixing frame, and the detection unit includes: a first connecting rod, which is rotatably arranged on the fixing frame; a second connecting rod, which is rotatably arranged on the first connecting rod; a third connecting rod, which is rotatably arranged on the second connecting rod; and a fourth connecting rod, which is rotatably arranged on the third connecting rod.

[0016] A mounting frame is rotatably arranged on the fourth connecting rod; and a temperature sensor is arranged on the mounting frame.

[0017] Further, the first connecting rod and the repair assembly are respectively located at opposite sides of the fixing frame, the first connecting rod can rotate relative to the fixing frame around a first rotation axis, the second connecting rod can rotate relative to the first connecting rod around a second rotation axis, the third connecting rod can rotate relative to the second connecting rod around a third rotation axis, the fourth connecting rod can rotate relative to the third connecting rod around a fourth rotation axis, and the mounting frame can rotate relative to the fourth connecting rod around a fifth rotation axis;

[0018] The axial directions of the first rotating shaft, the second rotating shaft and the third rotating shaft are all perpendicular to the horizontal plane, the axial directions of the fourth rotating shaft and the fifth rotating shaft are all parallel to the horizontal plane, and the axial direction of the fourth rotating shaft is perpendicular to the axial direction of the fifth rotating shaft.

[0019] Furthermore, a heating tube is provided on the outer periphery of the clamping assembly.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The clamping piece is arranged vertically to clamp the pipe vertically so that the inner wall of the pipe is perpendicular to the horizontal plane. The crack is then irradiated laterally by the laser transmitter head, so that the crack is laterally sunken from the inner wall surface to the outside to form a molten pool. The solution in the molten pool cannot jump laterally due to the combined action of its surface tension and gravity, and cannot form depressions and protrusions on its surface after the molten pool solidifies, thereby improving the roughness of the metal surface after laser remelting technology processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the crack repair device in the embodiment;

[0023] Figure 2 It is a schematic diagram of the structure of the repair component and the clamping component in the embodiment;

[0024] Figure 3 It is a structural schematic diagram of the repair component and the detection unit in the embodiment;

[0025] Figure 4 Schematic diagram of the structure of the pipe fitting and the clamping member in the embodiment;

[0026] In the figure:

[0027] 100, clamping assembly; 110, clamping member; 120, rotating motor;

[0028] 200, repair component; 210, laser transmitter head; 220, slider; 230, slide rail;

[0029] 300, detection unit; 310, first connecting rod; 320, second connecting rod; 330, third connecting rod; 340, fourth connecting rod; 350, mounting bracket; 360, temperature sensor;

[0030] 400, heating tube;

[0031] 500, control box;

[0032] 600, fixed stand; 610, fixed stand;

[0033] 700. Pipe fittings. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] Please refer to Figure 1-Figure 4 The present invention discloses a crack repair device for the inner wall of a hard chrome plated pipe, comprising:

[0036] The clamping assembly 100 comprises a clamping member 110, and the pipe 700 can be clamped on the clamping member 110 in a direction in which the inner wall thereof is perpendicular to a horizontal plane;

[0037] The repair component 200 is arranged in the height direction with the clamping component 100. The repair component 200 includes a laser emitting head 210. The laser emitting head 210 is used to emit laser to the inner wall of the pipe 700 to form a transversely depressed molten pool on the inner wall of the pipe 700. The laser emitting head 210 can slide to different depths in the pipe 700 along the height direction relative to the pipe 700, and the laser emitting head 210 can rotate relative to the pipe 700 to different positions at the same depth in the pipe 700.

[0038] Specifically, the pipe 700 is clamped by the clamp 110, and the laser head in the repair assembly 200 slides into the pipe 700 in the vertical direction and irradiates the cracks, so that a molten pool is formed and solidified, thereby repairing the cracks. By the relative sliding of the laser head and the pipe 700, the laser emitting head 210 can act on different heights of the inner wall of the pipe 700, and by the relative rotation of the laser head and the pipe 700, the laser emitting head 210 can act on different positions of the same height of the inner wall of the pipe 700.

[0039] It is important to note that, in the existing cases of repairing cracks on the inner wall of the pipe 700 by laser remelting technology, the pipe 700 is placed horizontally and the laser is irradiated downward to the lowest point of the inner wall of the pipe 700, in order to form a molten pool that is concave from the inner wall downward, and then the solution in the molten pool is pressed downward under the action of its gravity, so that the molten liquid can fill the gap of the crack to repair the crack. Such a setting has been generally recognized by technicians in this field. However, due to the horizontal arrangement of the pipe 700, the molten pool formed by it is concave from the inner wall downward, causing the solution to jump up and down at high temperature, resulting in many protrusions and depressions on the surface of the inner wall of the pipe 700 after solidification, and the surface roughness is extremely low, so it is impossible to use this technology to process the pipe 700 with high precision requirements.

[0040] Based on this, in the present application, the clamping member 110 is vertically arranged to clamp the pipe 700 vertically so that the inner wall of the pipe 700 is perpendicular to the horizontal plane, and then the crack is laterally irradiated by the laser transmitting head 210, so that the crack is laterally sunken from the inner wall surface to the outside to form a molten pool. The solution in the molten pool cannot jump laterally due to the combined action of its surface tension and gravity, and it is also impossible to form depressions and protrusions on its surface after the molten pool solidifies, thereby improving the roughness of the metal surface after laser remelting technology processing.

[0041] It should be noted that the hydrogen embrittlement cracks on the surface of the hard chromium coating are micron or nanometer-sized cracks, and the molten pool formed is also very small. Even if the pipe 700 is placed vertically, the metal solution in the molten pool cannot break through the surface tension and flow downward, but will stay in the molten pool and will not affect the crack repair effect.

[0042] At the same time, the laser emitting head 210 irradiates the crack to form a molten pool, so that the chromium plating layer and the iron body are melted into an alloy layer, thereby improving the bonding strength between the chromium plating layer and the body.

[0043] Furthermore, the clamping member 110 is arranged in a tubular shape, and the clamping member 110 includes a first connecting section and a second connecting section fixed to each other, and the inner diameter of the first connecting section is larger than the inner diameter of the second connecting section, so as to form a step surface at the connection between the first connecting section and the second connecting section, and the step surface can be abutted against the bottom of the pipe 700.

[0044] Specifically, the inner diameter of the first connecting section is larger, and the inner diameter of the second connecting section is smaller, so that a step surface is formed at the connection between the two. The pipe fitting 700 is extended into the first connecting section and the bottom of the pipe fitting 700 is abutted against the step surface to achieve clamping of the pipe fitting 700.

[0045] Furthermore, the inner diameter of the first connecting section is greater than or equal to the outer diameter of the pipe 700 .

[0046] Furthermore, the axial direction of the clamping member 110 is perpendicular to the horizontal plane, and the step surface is parallel to or coincides with the horizontal plane.

[0047] The axis of the clamping member 110 is perpendicular to the horizontal plane, and the step surface is horizontal, so that after the clamping member 110 clamps the pipe 700, the axis of the pipe 700 is perpendicular to the vertical direction, thereby achieving a horizontal depression of the molten pool, and the molten liquid will not jump horizontally, which greatly improves the roughness of the inner wall of the pipe 700 after processing.

[0048] Furthermore, it also includes a fixed stand 600, and the repair assembly 200 is installed on the fixed stand 600;

[0049] A rotating motor 120 is disposed on the fixed stand 600 , and the clamping member 110 is connected to the rotating motor 120 .

[0050] Furthermore, the repair component 200 also includes a fixed frame 610, which is connected to the fixed platform 600, and a slide rail 230 arranged along the vertical direction is provided on the fixed frame 610, a slider 220 is slidably provided on the slide rail 230, and the laser transmitter 210 is arranged on the slider 220.

[0051] Specifically, the rotating motor 120 drives the clamping member 110 to rotate, thereby realizing the relative rotation of the pipe 700 and the laser emitting head 210. The sliding of the slider 220 on the slide rail 230 can realize the relative sliding of the pipe 700 and the laser emitting head 210.

[0052] Furthermore, a detection unit 300 is further provided on the fixing frame 610, and the detection unit 300 includes: a first connecting rod 310, which is rotatably provided on the fixing frame 610; a second connecting rod 320, which is rotatably provided on the first connecting rod 310; a third connecting rod 330, which is rotatably provided on the second connecting rod 320; and a fourth connecting rod 340, which is rotatably provided on the third connecting rod 330.

[0053] A mounting bracket 350 is rotatably disposed on the fourth connecting rod 340 ; and a temperature sensor 360 is disposed on the mounting bracket 350 .

[0054] Furthermore, a heating tube 400 is provided on the outer periphery of the clamping assembly 100 .

[0055] Specifically, the heating tube 400 is provided to heat the pipe 700. The temperature sensor 360 is provided to detect the temperature of the pipe 700 in real time, and the power of the heating tube 400 is controlled by the detected temperature. In this way, the cooling rate after laser remelting is precisely controlled to avoid stress accumulation and secondary cracks in the coating caused by excessive cooling.

[0056] Further, the first connecting rod 310 and the repair assembly 200 are respectively located at opposite sides of the fixing frame 610, the first connecting rod 310 can rotate relative to the fixing frame 610 around a first rotation axis, the second connecting rod 320 can rotate relative to the first connecting rod 310 around a second rotation axis, the third connecting rod 330 can rotate relative to the second connecting rod 320 around a third rotation axis, the fourth connecting rod 340 can rotate relative to the third connecting rod 330 around a fourth rotation axis, and the mounting frame 350 can rotate relative to the fourth connecting rod 340 around a fifth rotation axis;

[0057] The axial directions of the first rotating shaft, the second rotating shaft and the third rotating shaft are all perpendicular to the horizontal plane, the axial directions of the fourth rotating shaft and the fifth rotating shaft are all parallel to the horizontal plane, and the axial direction of the fourth rotating shaft is perpendicular to the axial direction of the fifth rotating shaft.

[0058] Specifically, since the repair assembly 200 is disposed on the front of the fixing frame 610, the detection unit 300 is disposed on the back of the fixing frame 610 to avoid positional interference between the two. The first connecting rod 310, the second connecting rod 320 and the third connecting rod 330 are disposed, and the first rotating shaft, the second rotating shaft and the third rotating shaft are vertical, so that the temperature sensor 360 can pass over the fixing frame 610 from the back of the fixing frame 610 and rotate to the front of the fixing frame 610 to realize temperature detection of the pipe 700. The fourth rotating shaft and the fifth rotating shaft are disposed perpendicular to each other and in the same horizontal plane, so that the detection angle and detection height of the temperature sensor 360 can be adjusted by rotating the fourth rotating shaft and the fifth rotating shaft, so as to be continuously adjusted as the detection head is gradually extended.

[0059] Furthermore, a laser processing crack repair method is also disclosed, comprising the following steps:

[0060] S1, placing the pipe 700 with a chrome coating on the clamp 110 for heating;

[0061] S2. Set the rotation speed of the pipe 700, and then set the start and stop positions of the laser transmitter 210 according to the length of the pipe 700 to be processed to ensure full coverage of the laser processing of the internal coating of the pipe 700, and finally set the feed speed of the laser transmitter 210 according to the crack repair requirements.

[0062] S3, using a high-frequency heating module to quickly raise the temperature to 400° C. and maintain the temperature, and start the nitrogen protective atmosphere and the workpiece rotating motor 120; wherein the high-frequency heating module includes a detection unit 300 and a heating tube 400;

[0063] S4, start the set laser processing automation program, including feeding, starting, stopping and resetting of the laser transmitting head 210; wherein the rotation parameters of the rotating motor 120, the sliding direction and speed of the slider 220 and the power of the heating tube 400 are controlled by the control box 500;

[0064] S5. Repeat steps S3-S4 to perform the next workpiece coating laser processing until the cracks are repaired.

[0065] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0066] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A crack repair device for the inner wall of a hard chrome plated pipe, characterized in that: include: A clamping assembly, comprising a clamping member, the pipe member can be clamped on the clamping member in a direction in which the inner wall of the pipe member is perpendicular to a horizontal plane; A repair component is arranged in the height direction with the clamping component, and the repair component includes a laser emitting head, which is used to emit laser to the inner wall of the pipe fitting to form a transversely depressed molten pool on the inner wall of the pipe fitting; the laser emitting head can slide to different depths in the pipe fitting along the height direction relative to the pipe fitting, and the laser emitting head can be rotated relative to the pipe fitting to different positions facing the same depth in the pipe fitting.

2. A crack repair device for the inner wall of a hard chrome plated pipe according to claim 1, characterized in that: The clamping member is arranged in a tubular shape, and includes a first connecting section and a second connecting section fixedly connected to each other. The inner diameter of the first connecting section is larger than the inner diameter of the second connecting section, so as to form a step surface at the connection between the first connecting section and the second connecting section, and the step surface can be abutted against the bottom of the pipe.

3. A crack repair device for the inner wall of a hard chrome plated pipe according to claim 2, characterized in that: The inner diameter of the first connecting section is greater than or equal to the outer diameter of the pipe.

4. A crack repair device for the inner wall of a hard chrome plated pipe according to claim 2, characterized in that: The axial direction of the clamping member is perpendicular to the horizontal plane, and the step surface is parallel to or coincides with the horizontal plane.

5. The crack repair device for the inner wall of a hard chrome plated pipe according to claim 1, characterized in that: It also includes a fixed stand, and the repair component is installed on the fixed stand; A rotating motor is arranged on the fixed stand, and the clamping member is connected to the rotating motor.

6. A crack repair device for the inner wall of a hard chrome plated pipe according to claim 5, characterized in that: The repair component also includes a fixed frame connected to the fixed platform, on which a slide rail arranged in a vertical direction is provided, on which a slider is slidably provided, and the laser transmitter head is arranged on the slider.

7. A crack repair device for the inner wall of a hard chrome plated pipe according to claim 6, characterized in that: A detection unit is also provided on the fixing frame, and the detection unit includes: a first connecting rod, which is rotatably arranged on the fixing frame; a second connecting rod, which is rotatably arranged on the first connecting rod; a third connecting rod, which is rotatably arranged on the second connecting rod; and a fourth connecting rod, which is rotatably arranged on the third connecting rod. A mounting frame is rotatably arranged on the fourth connecting rod; and a temperature sensor is arranged on the mounting frame.

8. The crack repairing device for the inner wall of a hard chrome plated pipe according to claim 7, characterized in that: The first connecting rod and the repair assembly are respectively located at opposite sides of the fixing frame, the first connecting rod can rotate relative to the fixing frame around a first rotation axis, the second connecting rod can rotate relative to the first connecting rod around a second rotation axis, the third connecting rod can rotate relative to the second connecting rod around a third rotation axis, the fourth connecting rod can rotate relative to the third connecting rod around a fourth rotation axis, and the mounting frame can rotate relative to the fourth connecting rod around a fifth rotation axis; The axial directions of the first rotating shaft, the second rotating shaft and the third rotating shaft are all perpendicular to the horizontal plane, the axial directions of the fourth rotating shaft and the fifth rotating shaft are all parallel to the horizontal plane, and the axial direction of the fourth rotating shaft is perpendicular to the axial direction of the fifth rotating shaft.

9. The crack repair device for the inner wall of a hard chrome plated pipe according to claim 1, characterized in that: A heating tube is also provided on the periphery of the clamping assembly.

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