A laser cleaning device and method for the interior of a GIL pipe with conductors

Abstract

The application provides a laser cleaning device and method for a GIL pipe with a conductor, which comprises a laser, a transmission optical cable, a laser cleaning processing head, a water chiller, a ring centering motion mechanism and an electrical control cabinet; the water chiller is used for cooling the laser and the laser cleaning processing head; the laser transmits laser energy to the laser cleaning processing head through the transmission optical cable; and the electrical control cabinet is used for providing electrical control for the laser, the water chiller, the laser cleaning processing head and the ring centering motion mechanism. The device utilizes the characteristics of high intensity, large energy density, strong focusing and good directivity of laser to melt and vaporize burrs, finally remove the burrs, greatly improve the operation efficiency of removing burrs on the inner wall of the GIL pipe, remove dust on the surface of the conductor and improve the consistency of the surface quality after cleaning.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser cleaning processing, in particular to a laser cleaning device and method for the interior of a GIL pipeline with a conductor. BACKGROUND

[0002] A gas insulated metal enclosed transmission line (GIL) is a high-voltage, large-current, long-distance power transmission device that uses sulfur hexafluoride (SF6) or other gas insulation, and has a coaxial arrangement of the outer shell and the conductor. The internal conductor is used for high-voltage and large-current transmission, and the GIL pipeline is used to seal the conductor. The GIL has the advantages of large transmission capacity, small loss, small land occupation, high operation reliability, small maintenance amount, long service life, and small environmental impact, and has been widely used in the hydropower industry. However, the internal surface of the GIL pipeline may produce burrs and other defects during the welding manufacturing process, which may cause arc breakdown failure during the GIL withstand voltage test or daily operation, resulting in economic losses due to shutdown and maintenance, and also causing adverse effects on normal power use.

[0003] At present, the traditional cleaning methods for the GIL pipeline with an internal conductor have the disadvantages of slow operation efficiency and environmental pollution, whether it is manual polishing or high-pressure water jet flushing. Therefore, there is an urgent need for a non-contact, efficient and environmentally friendly cleaning method to solve the problem of arc breakdown caused by burrs on the inner wall of the GIL pipeline due to welding under the condition of the GIL pipeline with an internal conductor, and to remove dust on the surface of the conductor. SUMMARY

[0004] The present application provides a laser cleaning device and method for the interior of a GIL pipeline with a conductor. The device utilizes the characteristics of high intensity, high energy density, strong focusing and good directivity of laser to melt and vaporize the burrs, ultimately removing the burrs and removing the dust on the surface of the conductor. This can greatly improve the operation efficiency of removing burrs on the inner wall of the GIL pipeline and improve the consistency of the surface quality after cleaning.

[0005] To achieve the above technical features, the purpose of the present application is achieved as follows: a laser cleaning device for the interior of a GIL pipeline with a conductor, comprising a laser, a transmission optical cable, a laser cleaning processing head, a water chiller, an annular centering motion mechanism and an electrical control cabinet; the water chiller is used to cool the laser and the laser cleaning processing head; the laser transmits laser energy to the laser cleaning processing head through the transmission optical cable; the electrical control cabinet is used to provide electrical control for the laser, the water chiller, the laser cleaning processing head and the annular centering motion mechanism.

[0006] The chiller is connected to the laser through a laser cooling water pipe to provide circulating cooling water, maintain the operation of the laser, and enable the laser to continuously generate a laser energy beam; the laser is connected to the laser cleaning processing head through a transmission optical cable to transmit the laser energy beam to the laser cleaning processing head; the chiller is connected to the laser cleaning processing head through a laser cleaning processing head cooling water pipe to provide cooling water, maintain the thermal balance of the laser cleaning processing head during operation, and prevent the laser cleaning processing head from being damaged due to excessive temperature.

[0007] The electrical control cabinet controls the size, frequency, and switching of the laser energy beam energy output by the laser through a laser control cable; the electrical control cabinet controls the movement speed of each shaft of the ring centering motion mechanism through a ring centering motion mechanism control cable; the electrical control cabinet controls the forward and backward movement of the linear motor module of the laser cleaning processing head through a laser cleaning processing head control cable; and the electrical control cabinet supplies power to the chiller through a chiller cable.

[0008] The laser, chiller, and electrical control cabinet are placed on the ground, the laser cleaning processing head is fixedly connected to the ring centering motion mechanism through an adapter plate, and the ring centering motion mechanism is stably supported coaxially with the inner wall of the pipeline through its fixed frame; the GIL pipeline and the conductor are the objects of laser cleaning of the device.

[0009] The laser cleaning processing head includes an optical cable connector, an adapter plate, a linear motor module, a protective mirror assembly, a collimating optical lens group, a focusing optical lens group, and a conical lens; the optical cable connector, adapter plate, collimating optical lens group, focusing optical lens group, conical lens, and protective mirror assembly are coaxially arranged; the laser beam transmitted by the transmission optical cable passes through the collimating optical lens group, focusing optical lens group, and conical lens in sequence to form a focused spot on the inner wall of the GIL pipeline and the surface of the conductor, and the circumferential feeding laser cleaning of the ring centering motion mechanism is cooperated.

[0010] The optical cable connector is used to connect, lock, and receive laser with the transmission optical cable; the collimating optical lens group is fixedly connected with the moving end of the linear motor module and constitutes an integrated design structure, the collimating optical lens group is driven by the linear motor module to move along the axial direction within a certain range, so that the light beam after passing through the collimating optical lens group presents different convergence states, and this structure can realize the effects of changing the focal length, focusing spot diameter, and focal depth to adapt to different pipeline inner wall diameters; and the moving distance of the collimating optical lens group can be selected according to actual processing requirements.

[0011] The focal length of the collimating optical group is selected as 50-75mm; the focusing optical group focuses the laser beam after the collimating optical group at a certain angle, and the focal length of the focusing optical group is selected as 175-250mm; the conical lens changes the propagation direction of the laser beam propagating along the optical axis and focuses to generate a ring-shaped beam profile; the protection mirror assembly is selected as a pluggable mode and is installed at the light outlet position of the laser cleaning machining head to protect the internal optical components of the laser cleaning machining head from pollution;

[0012] The included angle α between the mirror surface of the conical lens and the vertical surface is selected as 20°-50°, which is used to adjust the divergence angle of the laser beam after passing through the conical lens, and then determines the generated ring-shaped focused spot to adapt to the size of the diameter of the inner wall of the pipeline.

[0013] The ring-shaped centering motion mechanism includes a circumferential motion assembly and a position adjustment assembly, wherein the circumferential motion assembly is designed as a frame structure, and an integrated guide rail rack is installed on the top of the frame structure, and a driving motor can drive the position adjustment assembly to make circumferential motion along the pipeline.

[0014] The position adjustment assembly includes an X-axis motion module and a Y-axis motion module, and the X-axis motion module can drive the laser cleaning machining head to move along the radial direction of the pipeline to a suitable focal point position, and the Y-axis motion module can drive the laser cleaning machining head to move along the axial direction of the pipeline, so that the laser cleaning path is in a spiral shape, and finally covers the inner wall of the pipeline and the surface of the conductor to complete the entire cleaning process.

[0015] A method for laser cleaning of the inner wall of a GIL pipeline with a conductor is adopted, which includes the following steps:

[0016] S1: Before use, determine the diameter size of the inner wall of the GIL pipeline and the surface of the conductor, and adjust the X linear motion module to drive the laser cleaning machining head to move to the center position of the inner wall of the GIL pipeline and the surface of the conductor;

[0017] S2: Turn on the power switches of the water chiller, the electrical control cabinet and the laser in sequence, and adjust the linear motor module to focus the ring-shaped laser beam emitted by the laser cleaning machining head near the inner wall of the GIL pipeline and the surface of the conductor;

[0018] S3: Start the laser to emit laser, cooperate with the ring-shaped centering motion mechanism to move uniformly along the circumferential direction of the GIL pipeline, and the Y-axis motion module also feeds along the axial direction of the GIL pipeline at a certain speed, so that the laser cleaning path is in a spiral shape to complete the entire cleaning process; observe whether the pollution cleaning of the inner wall surface of the GIL pipeline and the surface of the conductor is qualified, if not, adjust the average power or pulse frequency parameters of the laser emitted by the laser again, and perform regional cleaning verification again until it is qualified;

[0019] S4: After passing, call the debugged program again to complete the cleaning.

[0020] The present application has the beneficial effects:

[0021] 1、The present application can cooperate with the circumferential movement mechanism to directly clean the inner wall of the pipeline by forming the focused light spot after the optical shaping of the conical lens, and the movement mode is simple, so that the efficient cleaning of the inner wall of the pipeline and the conductor can be realized.

[0022] 2、The present application adopts the linear motor module to drive the collimating optical lens group to move forward and backward along the axial direction, so that the light beams passing through the collimating optical lens group present different divergence or convergence states, the effects of changing the length of focal length, the size of focused light spot diameter and focal depth are realized, not only the cleaning of different GIL pipeline inner wall diameters can be adapted, but also the diversified cleaning process requirements can be met. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in combination with the drawings and examples.

[0024] Figure 1 is the schematic diagram of the present application.

[0025] Figure 2 is the schematic diagram of the wiring of the present application.

[0026] Figure 3 is the schematic diagram of the laser cleaning machining head of the present application.

[0027] Figure 4 is the optical path schematic diagram of the laser cleaning machining head of the present application.

[0028] Figure 5 is the optical path change schematic diagram of the laser cleaning machining head of the present application.

[0029] Figure 6 is the schematic diagram of the conical lens of the present application.

[0030] Figure 7 is the schematic diagram of the ring centering movement mechanism of the present application.

[0031] Figure 8 is the schematic diagram of the circumferential movement assembly of the present application.

[0032] Figure 9 is the schematic diagram of the position adjusting assembly of the present application.

[0033] In the figure: 1, laser cleaning processing head; 2, annular centering motion mechanism; 3, transmission optical cable; 4, laser; 5, cold water machine; 6, electrical control cabinet; 7, laser cooling water pipe; 8, laser cleaning processing head cooling water pipe; 9, laser control cable; 10, cold water machine cable; 11, annular centering motion mechanism control cable; 12, laser cleaning processing head control cable; 13, optical cable joint; 14, adapter plate; 15, linear motor module; 16, protective mirror assembly; 17, collimating optical lens group; 18, focusing optical lens group; 19, conical lens; 20, circumferential motion assembly; 21, position adjustment assembly; 22, fixed frame; 23, integrated guide rail rack; 24, driving motor; 25, X-axis motion module; 26, Y-axis motion module. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be further described below with reference to the accompanying drawings.

[0035] Example 1

[0036] Referring to Figure 1 , a laser cleaning device inside a GIL pipe with a conductor includes a laser 4, a transmission optical cable 3, a laser cleaning processing head 1, a cold water machine 5, an annular centering motion mechanism 2, and an electrical control cabinet 6; the cold water machine 5 is used to cool the laser 4 and the laser cleaning processing head 1; the laser 4 transmits laser energy to the laser cleaning processing head 1 through the transmission optical cable 3; the electrical control cabinet 6 is used to provide electrical control for the laser 4, the cold water machine 5, the laser cleaning processing head 1, and the annular centering motion mechanism 2. By using the characteristics of laser, such as high intensity, large energy density, strong focusing, and good directivity, burrs are melted and vaporized, and finally removed, which greatly improves the operation efficiency of removing burrs inside the GIL pipe and improves the consistency of the surface quality of the conductor after cleaning.

[0037] Further, referring to Figure 2 , the cold water machine 5 is connected to the laser 4 through the laser cooling water pipe 7 to provide circulating cooling water, maintain the operation of the laser 4, and enable the laser 4 to continuously generate a laser energy beam; the laser 4 is connected to the laser cleaning processing head 1 through the transmission optical cable 3 and transmits a laser energy beam to the laser cleaning processing head 1; the cold water machine 5 is connected to the laser cleaning processing head 1 through the laser cleaning processing head cooling water pipe 8 to provide cooling water, maintain the thermal balance of the laser cleaning processing head 1 during operation, and prevent the laser cleaning processing head 1 from being damaged due to excessive temperature. Further, the cold water machine 5 provides good cooling protection for the entire device.

[0038] Further, the electrical control cabinet 6 controls the laser 4 to output laser energy beam energy size, frequency and switching through the laser control cable 9; the electrical control cabinet 6 controls the ring centering motion mechanism 2 to control the peripheral feed speed and the movement speed of the X, Y movement module through the ring centering motion mechanism control cable 11; the electrical control cabinet 6 controls the laser cleaning processing head 1 to move forward and backward through the linear motor module 15 through the laser cleaning processing head control cable 12; the electrical control cabinet 6 supplies power to the water chiller 5 through the water chiller cable 10.

[0039] Further, the laser 4, the water chiller 5 and the electrical control cabinet 6 are placed on the ground, the laser cleaning processing head 1 is fixedly connected with the ring centering motion mechanism 2 through the adapter plate 14, the ring centering motion mechanism 2 is stably supported coaxially with the inner wall of the pipeline through the fixed frame 22 thereof; the GIL pipeline and the conductor are the objects of laser cleaning of the device.

[0040] Further, as shown in the figure, Figures 3-4 the laser cleaning processing head 1 comprises a fiber cable joint 13, an adapter plate 14, a linear motor module 15, a protective mirror assembly 16, a collimating optical lens group 17, a focusing optical lens group 18 and a conical lens 19; the fiber cable joint 13, the adapter plate 14, the collimating optical lens group 17, the focusing optical lens group 18, the conical lens 19 and the protective mirror assembly 16 are coaxially arranged; the laser beam transported by the transmission optical cable 3 passes through the collimating optical lens group 17, the focusing optical lens group 18 and the conical lens 19 in turn to form a focused spot on the inner wall of the GIL pipeline, and the axial feeding of the ring centering motion mechanism 2 is matched to realize laser cleaning.

[0041] Further, the fiber cable joint 13 is used to connect, lock and receive laser with the transmission optical cable 3; the collimating optical lens group 17 is fixedly connected with the moving end of the linear motor module 15 and constitutes an integrated design structure, the collimating optical lens group 17 is driven by the linear motor module 15 to move axially within a certain range, so that the light beam passing through the collimating optical lens group 17 presents different convergence states, and this structure can realize the effects of changing the length of focal length, the size of focused spot diameter and the depth of focus to adapt to different pipeline inner wall diameters; and the moving distance of the collimating optical lens group 17 can be selected according to actual processing requirements, and the stroke of the collimating optical lens group 17 is selected as 15mm.

[0042] Further, the type of the fiber cable joint 13 is not limited to QBH / QD and Q+, and in this embodiment, the QBH fiber cable joint is adopted.

[0043] Further, as shown in the figure, Figures 4-5The focal length of the collimating optical lens group 17 is selected to be 50-75 mm; the focusing optical lens group 18 focuses the laser beam after passing through the collimating optical lens group 17 at a certain angle, and the focal length of the focusing optical lens group 18 is selected to be 175-250 mm; the conical lens 19 changes the propagation direction of the laser beam propagating along the optical axis and focuses to generate a ring-shaped beam profile; the protection mirror assembly 16 is selected to be pluggable, and is installed at the light outlet position of the laser cleaning machining head 1 to protect the internal optical components of the laser cleaning machining head 1 from pollution.

[0044] Figure 4 In the case where D1 is the diameter of the ring-shaped beam profile after passing through the laser cleaning machining head when the collimating optical lens group is located at the positive focal point.

[0045] Figure 5 In the case where D2 is the diameter of the ring-shaped beam profile after passing through the laser cleaning machining head when the collimating optical lens group is located at the negative focal point.

[0046] Further, as Figure 6 The angle α between the mirror surface of the conical lens 19 and the vertical surface is selected to be between 20° and 50°, which is used to adjust the divergence angle of the laser beam after passing through the conical lens 19, and then determine the generated focused spot to adapt to the size of the inner wall diameter of the pipeline.

[0047] Further, as Figures 7-8 The ring-shaped centering motion mechanism 2 includes a circumferential motion assembly 20 and a position adjustment assembly 21, wherein the circumferential motion assembly 20 is designed as a frame structure, and an integrated guide rail rack 23 is installed on the top of the frame structure, and a driving motor 24 can drive the position adjustment assembly 21 to make circumferential motion along the pipeline.

[0048] Further, as Figure 9 The position adjustment assembly 21 includes an X-axis motion module 25 and a Y-axis motion module 26, wherein the X-axis motion module can drive the laser cleaning machining head 1 to move along the radial direction of the pipeline to a suitable focal point position, and the Y-axis motion module can drive the laser cleaning machining head 1 to move along the axial direction of the pipeline, so that the laser cleaning path is in a spiral shape, and finally the cleaning area covers the inner wall of the pipeline and the surface of the conductor.

[0049] Embodiment 2:

[0050] A method for laser cleaning the inner wall of a GIL pipeline with a conductor, comprising the following steps:

[0051] S1: Before use, determine the diameter size of the inner wall of the GIL pipeline and the surface of the conductor, and adjust the X-axis motion module 25 to drive the laser cleaning machining head 1 to move to the center position of the inner wall of the GIL pipeline and the surface of the conductor;

[0052] S2: Turn on the power switches of the cooling water machine 5, the electrical control cabinet 6 and the laser 4 in turn, adjust the linear motor module 15 to focus the annular laser beam emitted by the laser cleaning processing head 1 on the inner wall of the GIL pipeline and the surface of the conductor;

[0053] S3: Start the laser 4 to emit laser, cooperate with the annular centering motion mechanism 2 to move uniformly along the circumference of the GIL pipeline, and the Y-axis motion module 26 also feeds axially along the GIL pipeline at a certain speed, so that the laser cleaning path is spiral and the entire cleaning process is completed; observe whether the pollution cleaning of the inner wall surface and the conductor surface of the GIL pipeline is qualified, if not, adjust the average power or pulse frequency parameters of the laser 4 again, and perform regional cleaning verification again until it is qualified;

[0054] S4: After being qualified, the complete cleaning is performed again by calling the debugged program.

Claims

1. A method for laser cleaning of the inner wall of a GIL pipe with a conductor by using a GIL pipe internal laser cleaning device, the GIL pipe internal laser cleaning device comprising a laser (4), a transmission optical cable (3), a laser cleaning processing head (1), a water chiller (5), a ring centering motion mechanism (2) and an electrical control cabinet (6); the water chiller (5) is used for cooling the laser (4) and the laser cleaning processing head (1); the laser (4) transmits laser energy to the laser cleaning processing head (1) through the transmission optical cable (3); the electrical control cabinet (6) is used for providing electrical control for the laser (4), the water chiller (5), the laser cleaning processing head (1) and the ring centering motion mechanism (2); the laser cleaning processing head (1) comprises an optical cable connector (13), an adapter plate (14), a linear motor module (15), a protective mirror assembly (16), a collimating optical lens group (17), a focusing optical lens group (18) and a conical lens (19); the optical cable connector (13), the adapter plate (14), the collimating optical lens group (17), the focusing optical lens group (18), the conical lens (19) and the protective mirror assembly (16) are coaxially arranged; the laser beam delivered by the transmission optical cable (3) passes through the collimating optical lens group (17), the focusing optical lens group (18) and the conical lens (19) in sequence to form a focused spot on the inner wall of the GIL pipe and the surface of the conductor, and the laser cleaning is performed in cooperation with the circumferential feeding of the ring centering motion mechanism (2); the optical cable connector (13) is used for connecting and locking with the transmission optical cable (3) and receiving laser; the collimating optical lens group (17) is fixedly connected with the moving end of the linear motor module (15) and constitutes an integrated design structure; the collimating optical lens group (17) is driven by the linear motor module (15) to move along the axial direction within a certain range, so that the light beam passing through the collimating optical lens group (17) presents different convergence states; this structure can realize the effects of changing the length of the focal length, the size of the focused spot diameter and the focal depth, so as to adapt to different pipe inner wall diameters; and the moving distance of the collimating optical lens group (17) can be selected according to actual processing requirements; the focal length of the collimating optical lens group (17) is selected as 50-75mm; the focusing optical lens group (18) focuses the laser beam passing through the collimating optical lens group (17) at a certain angle, and the focal length of the focusing optical lens group (18) is selected as 175-250mm; the conical lens (19) changes the propagation direction of the laser beam propagating along the optical axis to focus and generate a ring beam profile; the protective mirror assembly (16) is selected as a pluggable type and is installed at the light outlet position of the laser cleaning processing head (1) to protect the internal optical components of the laser cleaning processing head (1) from pollution; the included angle α between the mirror surface slope of the conical lens (19) and the vertical surface is selected between 20°-50°, which is used for adjusting the divergence angle of the laser beam passing through the conical lens (19), and then determining the generated ring focused spot to adapt to the size of the pipe inner wall diameter. The annular centering motion mechanism (2) comprises a circumferential motion assembly (20) and a position adjustment assembly (21), wherein the circumferential motion assembly (20) is designed as a frame structure, the top of which is provided with an integrated guide rail rack (23), and a driving motor (24) can drive the position adjustment assembly (21) to make a circumferential motion along the pipe; The position adjustment assembly (21) comprises an X-axis motion module (25) and a Y-axis motion module (26), the X-axis motion module can drive the laser cleaning processing head (1) to move along the radial direction of the pipe to a suitable focal point position, and the Y-axis motion module can drive the laser cleaning processing head (1) to move along the axial direction of the pipe, so that the laser cleaning path is in a spiral shape, finally covering the inner wall of the pipe and the surface of the conductor, and completing the whole cleaning process; The method comprises the following steps: S1: before use, the diameters of the inner wall of the GIL pipe and the surface of the conductor are determined, and the X-axis motion module (25) is adjusted to drive the laser cleaning processing head (1) to move to the center position of the inner wall of the GIL pipe and the surface of the conductor; S2: the power switches of the water chiller (5), the electrical control cabinet (6) and the laser (4) are turned on in sequence, and the linear motor module (15) is adjusted to focus the annular laser beam emitted by the laser cleaning processing head (1) on the surface near the inner wall of the GIL pipe and the surface of the conductor; S3: the laser (4) is started to emit laser, and the annular centering motion mechanism (2) is started to move at a constant speed along the circumferential direction of the GIL pipe, and the Y-axis motion module (26) is also fed at a certain speed along the axial direction of the GIL pipe, so that the laser cleaning path is in a spiral shape to complete the whole cleaning process; whether the pollution cleaning of the inner wall surface of the GIL pipe and the surface of the conductor is qualified is observed, if not, the average power or pulse frequency parameters of the laser emitted by the laser (4) are adjusted again, and the regional cleaning verification is carried out again until it is qualified; S4: after being qualified, the complete cleaning is carried out again by calling the debugged program.

2. The method for laser cleaning the inner wall of a GIL pipe using a conductor-equipped internal laser cleaning device according to claim 1, characterized in that, The water chiller (5) is connected to the laser (4) through a laser cooler water pipe (7) to provide circulating cooling water, maintain the work of the laser (4), and enable the laser (4) to continuously generate a laser energy beam; the laser (4) is connected to the laser cleaning processing head (1) through a transmission optical cable (3) and transmits the laser energy beam to the laser cleaning processing head (1); the water chiller (5) is connected to the laser cleaning processing head (1) through a laser cleaning processing head cooling water pipe (8) to provide cooling water, maintain the heat balance of the laser cleaning processing head (1) during work, and prevent the laser cleaning processing head (1) from being damaged due to excessive temperature.

3. The method for laser cleaning the inner wall of a GIL pipeline using a conductor-equipped internal laser cleaning device according to claim 1, characterized in that, The electrical control cabinet (6) controls the energy size, frequency and switch of the laser energy beam output by the laser (4) through a laser control cable (9); the electrical control cabinet (6) controls the motion speed of each shaft of the annular centering motion mechanism (2) through an annular centering motion mechanism control cable (11); the electrical control cabinet (6) controls the linear motor module (15) of the laser cleaning processing head (1) to move forward and backward through a laser cleaning processing head control cable (12); and the electrical control cabinet (6) supplies power to the water chiller (5) through a water chiller cable (10).

4. The method for laser cleaning the inner wall of a GIL pipe using a conductor-equipped internal laser cleaning device according to claim 1, characterized in that, The laser (4), the water chiller (5) and the electrical control cabinet (6) are placed on the ground, the laser cleaning processing head (1) is fixedly connected with the annular centering movement mechanism (2) through the adapter plate (14), the annular centering movement mechanism (2) is stably and coaxially supported with the inner wall of the pipeline through the fixing frame (22) thereof; the GIL pipeline and the conductor are the objects of laser cleaning of the device.

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