Electromagnetic induction heating device and heating method of nuclear power RPV connecting pipe section

Abstract

The invention provides an electromagnetic induction heating device and a heating method of a nuclear power RPV connecting pipe section, and relates to the technical field of nuclear power, the electromagnetic induction heating device comprises a carrier roller, a chassis, a support, a first induction heater, a second induction heater, a first telescopic cylinder and a second telescopic cylinder, and the carrier roller is used for installing the connecting pipe section and driving the connecting pipe section to rotate along the axis of the carrier roller; the support is arranged on the chassis, the fixed ends of the first telescopic cylinder and the second telescopic cylinder are connected to the support in a spaced mode, the telescopic end of the first telescopic cylinder is connected to the first induction heater, the telescopic end of the second telescopic cylinder is connected to the second induction heater, and the first induction heater and the second induction heater are both in an arc shape. Compared with the prior art, the electromagnetic induction heating device has the advantages that an electromagnetic induction heating mode is adopted, the temperature is controllable, meanwhile, the heat efficiency is high, the first induction heater and the second induction heater are both designed to be in an arc shape, and the uniformity of the heating temperature can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and in particular to an electromagnetic induction heating device and a heating method for a nuclear power RPV pipe section. Background Art

[0002] When welding the inner wall of the nozzle section of a nuclear power reactor pressure vessel (RPV), it is necessary to preheat before welding and keep the material warm during welding. This is because the welding process will cause local heating of the material, resulting in stress and deformation, and heating can help reduce the thermal stress during welding and improve the quality of the welded joint.

[0003] The traditional heating method at present is gas combustion flame heating. However, when welding the connecting pipe section, it needs to rotate continuously in the circumferential direction to ensure continuous welding of the weld. The flame heating method has problems such as slow speed, uneven heating, inability to accurately control temperature, low thermal efficiency and carbon emissions. Summary of the invention

[0004] The problem to be solved by the present invention is: how to provide an electromagnetic induction heating device with uniform heating, controllable temperature and high thermal efficiency to replace traditional flame heating.

[0005] The present invention provides an electromagnetic induction heating device, which is used for heating a pipe section of a nuclear power RPV, wherein the pipe section includes a large diameter section and a small diameter section, and the electromagnetic induction heating device includes: a roller, a chassis, a bracket, a first induction heater, a second induction heater, a first telescopic cylinder and a second telescopic cylinder, wherein the roller is used for mounting the pipe section and driving the pipe section to rotate along its own axis, the bracket is arranged on the chassis, the fixed ends of the first telescopic cylinder and the second telescopic cylinder are connected to the bracket at intervals along an axial direction parallel to the pipe section, the telescopic end of the first telescopic cylinder is connected to the first induction heater and is used for driving the first induction heater to move toward the large diameter section, the telescopic end of the second telescopic cylinder is connected to the second induction heater and is used for driving the second induction heater to move toward the small diameter section, and the first induction heater and the second induction heater are both arc-shaped.

[0006] The electromagnetic induction heating device provided by the present invention has the following beneficial effects compared with the prior art:

[0007] The electromagnetic induction heating device described in the present invention places the take-up pipe section of the nuclear power RPV on rollers, and the rotation of the rollers can drive the take-up pipe section to rotate along its axis. The electromagnetic induction heating device is divided into two sections for heating according to the different diameters and lengths of the take-up pipe section of the nuclear power RPV, and two separate induction heaters are used, namely the first induction heater and the second induction heater. In order to ensure the heating speed and uniformity, a symmetrical heating method can be adopted on the left and right sides of the take-up pipe section, namely a total of four induction heaters, two of which (the first induction heaters) heat the large diameter part, and two (the second induction heaters) heat the small diameter part. When in use, first place the take-over section of the nuclear power RPV on the roller, then drive the first induction heater to move to the large diameter section close to the take-over section and keep a certain distance through the first telescopic cylinder, drive the second induction heater to move to the small diameter section close to the take-over section and keep a certain distance through the second telescopic cylinder, start the roller to drive the take-over section to rotate along its axis, start the first induction heater and the second induction heater, adjust the output power of the first induction heater and the second induction heater, preheat the take-over section before surfacing welding, and measure the temperature. When the temperature reaches the surfacing welding requirement, surfacing welding is performed on the inner wall of the take-over section, and the output power of the first induction heater and the second induction heater is adjusted to ensure the temperature between the welding layers. After the surfacing welding of the inner wall of the take-over section is completed, the output power of the first induction heater and the second induction heater is adjusted to increase the temperature. After reaching the post-weld heat treatment temperature, insulation is performed. After the post-weld heat treatment time is reached, the first induction heater and the second induction heater are turned off, and the rollers are stopped at the same time, thereby completing the heating work of the take-over section of the nuclear power RPV. Compared with the prior art, the electromagnetic induction heating device of the present invention adopts an electromagnetic induction heating method, has the advantages of controllable temperature, and has the advantage of high thermal efficiency. In addition, the first induction heater and the second induction heater are both designed to be arc-shaped, which can ensure the uniformity of the heating temperature.

[0008] Optionally, the first induction heater includes a first arc-shaped frame and a first induction heating cable, the first induction heating cable is arranged in the first arc-shaped frame, and the first arc-shaped frame is connected to the telescopic end of the first telescopic cylinder.

[0009] Optionally, the electromagnetic induction heating device also includes a third telescopic cylinder and a fourth telescopic cylinder, the first arc frame includes a first arc plate, a second arc plate and a third arc plate, the two ends of the second arc plate are respectively hinged to the first arc plate and the third arc plate, the fixed end of the third telescopic cylinder is connected to the bracket, the telescopic end of the third telescopic cylinder is connected to the first arc plate, the fixed end of the fourth telescopic cylinder is connected to the bracket, the telescopic end of the fourth telescopic cylinder is connected to the third arc plate, and the second arc plate is connected to the telescopic end of the first telescopic cylinder.

[0010] Optionally, the first induction heater further comprises a first roller, the first roller is arranged on the end surface of the first arc-shaped frame facing the connecting pipe section, and the first roller is used to contact the large diameter section of the connecting pipe section.

[0011] Optionally, the first induction heater includes a second arc-shaped frame and a second induction heating cable, the second induction heating cable is arranged in the second arc-shaped frame, and the second arc-shaped frame is connected to the telescopic end of the second telescopic cylinder.

[0012] Optionally, the electromagnetic induction heating device also includes a fifth telescopic cylinder and a sixth telescopic cylinder, the second arc frame includes a fourth arc plate, a fifth arc plate and a sixth arc plate, the two ends of the fifth arc plate are respectively hinged to the fourth arc plate and the sixth arc plate, the fixed end of the fifth telescopic cylinder is connected to the bracket, the telescopic end of the fifth telescopic cylinder is connected to the fourth arc plate, the fixed end of the sixth telescopic cylinder is connected to the bracket, the telescopic end of the sixth telescopic cylinder is connected to the sixth arc plate, and the fifth arc plate is connected to the telescopic end of the second telescopic cylinder.

[0013] Optionally, the first induction heater further comprises a second roller, the second roller is arranged on the end surface of the second arc-shaped frame facing the connecting pipe section, and the second roller is used for contacting the small diameter section of the connecting pipe section.

[0014] Optionally, the bracket includes a column, a beam, a vertical guide rail, a transverse guide rail, a transverse drive mechanism and a vertical drive mechanism, the column is vertically mounted on the chassis, the column is provided with the vertical guide rail, the beam is slidably connected to the vertical guide rail, the beam is provided with the transverse guide rail, the first telescopic cylinder and the second telescopic cylinder are respectively slidably connected to the transverse guide rail, the vertical drive mechanism is driven and connected to the beam for driving the beam to slide in the vertical direction, and the transverse drive mechanism is driven and connected to the first telescopic cylinder and the second telescopic cylinder respectively for driving the first telescopic cylinder and the second telescopic cylinder to slide in the horizontal direction.

[0015] Optionally, the electromagnetic induction heating device further comprises a turntable, the turntable comprising a base, a turntable and a slewing bearing, the slewing bearing is connected between the base and the turntable, the base is arranged on the chassis, and the bracket is arranged on the turntable.

[0016] In addition, the present invention also provides a method for heating a nuclear power RPV pipe section, based on the electromagnetic induction heating device as described above, the method comprising:

[0017] Place the pipe section on the roller;

[0018] The first induction heater is driven by the first telescopic cylinder to move toward the large diameter section close to the pipe section and maintain a preset distance, and the second induction heater is driven by the second telescopic cylinder to move toward the small diameter section close to the pipe section and maintain a preset distance;

[0019] Starting the roller, starting the first induction heater and the second induction heater, adjusting the output power of the first induction heater and the second induction heater, preheating the connecting pipe section before surfacing welding, and measuring the temperature;

[0020] When the temperature reaches the surfacing requirement, surfacing welding is performed on the inner wall of the connecting pipe section, and the output power of the first induction heater and the second induction heater is adjusted to ensure the temperature between the welding layers;

[0021] After the inner wall surfacing of the connecting pipe section is completed, the output power of the first induction heater and the second induction heater are adjusted to increase the temperature, and the temperature is kept after reaching the post-weld heat treatment temperature;

[0022] After the post-weld heat treatment time is reached, the first induction heater and the second induction heater are turned off, and the roller is stopped at the same time.

[0023] Since the technical improvement and technical effect of the heating method of the nuclear power RPV take-over section are the same as those of the electromagnetic induction heating device, the technical effect of the heating method of the nuclear power RPV take-over section will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the electromagnetic induction heating device according to an embodiment of the present invention;

[0025] Figure 2 The present invention is a flowchart of a method for heating a nuclear power RPV take-over section according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. roller; 2. chassis; 3. bracket; 31. column; 32. crossbeam; 4. first arc frame; 5. second arc frame; 6. second telescopic cylinder; 7. third telescopic cylinder; 8. fifth telescopic cylinder; 9. sixth telescopic cylinder; 10. turntable; 100. pipe section; 200. large diameter section; 300. small diameter section; 400. first induction heating power supply; 500. first controller; 600. second induction heating power supply; 700. second controller. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0032] Moreover, the Z-axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction of the arrow of the Z-axis) represents the top, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the bottom; the X-axis in the accompanying drawings represents the horizontal direction, that is, the left and right position, and the positive direction of the X-axis (that is, the direction of the arrow of the X-axis) represents the left, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the right; the Y-axis in the accompanying drawings represents the longitudinal direction, that is, the front and back position, and the positive direction of the Y-axis (that is, the direction of the arrow of the Y-axis) represents the front, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the back.

[0033] It should also be noted that the aforementioned Z-axis, X-axis and Y-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0034] like Figure 1As shown, the electromagnetic induction heating device of the embodiment of the present invention is used for heating the pipe section 100 of the nuclear power RPV, the pipe section 100 includes a large diameter section 200 and a small diameter section 300, and the electromagnetic induction heating device includes: a roller 1, a chassis 2, a bracket 3, a first induction heater, a second induction heater, a first telescopic cylinder and a second telescopic cylinder 6, the roller 1 is used to install the pipe section 100 and drive the pipe section 100 to rotate along its own axis, the bracket 3 is arranged on the chassis 2, the fixed ends of the first telescopic cylinder and the second telescopic cylinder 6 are connected to the bracket 3 at intervals along the axial direction parallel to the pipe section 100, the telescopic end of the first telescopic cylinder is connected to the first induction heater and is used to drive the first induction heater to move toward the large diameter section 200, the telescopic end of the second telescopic cylinder 6 is connected to the second induction heater and is used to drive the second induction heater to move toward the small diameter section 300, and the first induction heater and the second induction heater are both arc-shaped.

[0035] In this embodiment, combined with the attached Figure 1 As shown, the pipe section 100 of the nuclear power RPV is placed on the roller 1, and the rotation of the roller 1 can drive the pipe section 100 to rotate along its axis. The electromagnetic induction heating device is divided into two sections for heating according to the diameter and length of the pipe section 100 of the nuclear power RPV (the diameter of the large diameter section 200 of the pipe section 100 is larger than the small diameter section 300, and the length of the large diameter section 200 is smaller than the small diameter section 300). Two separate induction heaters are used, namely the first induction heater and the second induction heater. In order to ensure the heating speed and uniformity, a heating device can be used around the pipe section 100 (see FIG. 2 ). Figure 1The induction heaters are symmetrically heated on both sides (in the X-axis direction), that is, there are four induction heaters in total, two of which (the first induction heaters) heat the large diameter part (the large diameter section 200), and two (the second induction heaters) heat the small diameter part (the small diameter section 300). When in use, the pipe section 100 of the nuclear power RPV is first placed on the roller 1, and then the first telescopic cylinder drives the first induction heater to move to the large diameter section close to the pipe section 100 and keep a certain distance, and the second telescopic cylinder drives the second induction heater to move to the small diameter section close to the pipe section 100 and keep a certain distance, and the roller 1 is started to drive the pipe section 100 to rotate along its axis, and the first induction heater and the second induction heater are started, and the output power of the first induction heater and the second induction heater is adjusted, and the pipe section 100 is preheated before surfacing welding, and the temperature is measured. When the temperature reaches the surfacing welding requirement, the inner wall of the pipe section 100 is surfacing, and the output power of the first induction heater and the second induction heater is adjusted to ensure the temperature between the welding layers. After the surfacing welding of the inner wall of the pipe section 100 is completed, the output power of the first induction heater and the second induction heater is adjusted, and the temperature is increased. After reaching the post-weld heat treatment temperature, the temperature is kept. After the post-weld heat treatment time is reached, the first induction heater and the second induction heater are turned off, and the roller 1 is stopped at the same time, thereby completing the heating work of the pipe section 100 of the nuclear power RPV. Compared with the prior art, the electromagnetic induction heating device of the present invention adopts the electromagnetic induction heating method, has the advantages of temperature controllability and high thermal efficiency, and the first induction heater and the second induction heater are both designed to be arc-shaped, which can ensure the uniformity of heating temperature. The first telescopic cylinder and the second telescopic cylinder 6 can both be servo electric cylinders.

[0036] It should be noted that the first induction heater is equipped with a first induction heating power supply 400 and a first controller 500, wherein the first induction heating power supply 400 and the first controller 500 can be placed on the chassis 2, and the first induction heating power supply 400 can be a medium-frequency induction heating power supply in the prior art. Similarly, the second induction heater is equipped with a second induction heating power supply 600 and a second controller 700, wherein the second induction heating power supply 600 and the second controller 700 can be placed on the chassis 2, and the second induction heating power supply 600 can be a medium-frequency induction heating power supply in the prior art.

[0037] Optionally, the first induction heater includes a first arc-shaped frame 4 and a first induction heating cable, the first induction heating cable is arranged in the first arc-shaped frame 4, and the first arc-shaped frame 4 is connected to the telescopic end of the first telescopic cylinder.

[0038] In this embodiment, combined with the attached Figure 1As shown, the first arc frame 4 is made of high temperature resistant insulating material (such as polyimide), and the first induction heating cable can be fixed in the first arc frame 4 by screws, wherein the screws are made of non-magnetic material (such as non-magnetic alloy), ensuring that the first arc frame 4 will not be damaged by induction heating. Based on the cylindrical structure of the connecting pipe section 100, the first arc frame 4 is designed as an arc structure, which can increase the heating area, thereby ensuring the uniformity of the heating temperature.

[0039] Optionally, the electromagnetic induction heating device also includes a third telescopic cylinder 7 and a fourth telescopic cylinder, the first arc frame 4 includes a first arc plate, a second arc plate and a third arc plate, the two ends of the second arc plate are respectively hinged to the first arc plate and the third arc plate, the fixed end of the third telescopic cylinder 7 is connected to the bracket 3, the telescopic end of the third telescopic cylinder 7 is connected to the first arc plate, the fixed end of the fourth telescopic cylinder is connected to the bracket 3, the telescopic end of the fourth telescopic cylinder is connected to the third arc plate, and the second arc plate is connected to the telescopic end of the first telescopic cylinder.

[0040] In this embodiment, combined with the attached Figure 1 As shown, the third telescopic cylinder 7 and the fourth telescopic cylinder can both be servo electric cylinders, and the first arc frame 4 can be divided into three sections, namely a first arc plate, a second arc plate and a third arc plate, wherein the second arc plate is hinged between the first arc plate and the third arc plate, and the use radius of the first arc frame 4 can be adjusted by the third telescopic cylinder 7 and the fourth telescopic cylinder to make it basically consistent with the outer wall radius of the connecting pipe section 100, thereby adapting to the heating of different diameter positions of the connecting pipe section 100.

[0041] In other embodiments, the first arc-shaped frame 4 may also include a plurality of (more than 3) arc-shaped plates hinged to each other, and each arc-shaped plate is correspondingly provided with a telescopic cylinder.

[0042] Optionally, the first induction heater further includes a first roller, which is disposed on an end surface of the first arc-shaped frame 4 facing the connecting pipe section 100 , and is used to contact the large-diameter section 200 of the connecting pipe section 100 .

[0043] In this embodiment, combined with the attached Figure 1 As shown, a first roller is arranged on the end face of the first arc frame 4 facing the connecting pipe section 100, wherein a plurality of first rollers may be arranged at intervals, and the first roller is used to contact the large diameter section 200 of the connecting pipe section 100, and the first roller can prevent the first arc frame 4 from rubbing against the connecting pipe section 100.

[0044] Optionally, the first induction heater includes a second arc-shaped frame 5 and a second induction heating cable, the second induction heating cable is arranged in the second arc-shaped frame 5 , and the second arc-shaped frame 5 is connected to the telescopic end of the second telescopic cylinder 6 .

[0045] In this embodiment, combined with the attached Figure 1 As shown, the second arc frame 5 is made of high temperature resistant insulating material (such as polyimide), and the second induction heating cable can be fixed in the second arc frame 5 by screws, wherein the screws are made of non-magnetic material (such as non-magnetic alloy), ensuring that the second arc frame 5 will not be damaged by induction heating. Based on the cylindrical structure of the connecting pipe section 100, the second arc frame 5 is designed as an arc structure, which can increase the heating area, thereby ensuring the uniformity of the heating temperature.

[0046] Optionally, the electromagnetic induction heating device also includes a fifth telescopic cylinder 8 and a sixth telescopic cylinder 9, the second arc frame 5 includes a fourth arc plate, a fifth arc plate and a sixth arc plate, the two ends of the fifth arc plate are respectively hinged to the fourth arc plate and the sixth arc plate, the fixed end of the fifth telescopic cylinder 8 is connected to the bracket 3, the telescopic end of the fifth telescopic cylinder 8 is connected to the fourth arc plate, the fixed end of the sixth telescopic cylinder 9 is connected to the bracket 3, the telescopic end of the sixth telescopic cylinder 9 is connected to the sixth arc plate, and the fifth arc plate is connected to the telescopic end of the second telescopic cylinder 6.

[0047] In this embodiment, combined with the attached Figure 1 As shown, the fifth telescopic cylinder 8 and the sixth telescopic cylinder 9 can be servo electric cylinders, and the second arc frame 5 can be divided into three sections, namely a fourth arc plate, a fifth arc plate and a sixth arc plate, wherein the fifth arc plate is hinged between the fourth arc plate and the sixth arc plate, and the use radius of the second arc frame 5 can be adjusted by the fifth telescopic cylinder 8 and the sixth telescopic cylinder 9 to make it basically consistent with the outer wall radius of the connecting pipe section 100, thereby adapting to the heating of different diameter positions of the connecting pipe section 100.

[0048] In other embodiments, the second arc-shaped frame 5 may also include a plurality of (more than 3) arc-shaped plates hinged to each other, and each arc-shaped plate is correspondingly provided with a telescopic cylinder.

[0049] Optionally, the first induction heater further includes a second roller, which is disposed on an end surface of the second arc-shaped frame 5 facing the connecting pipe section 100 , and the second roller is used to contact the small diameter section 300 of the connecting pipe section 100 .

[0050] In this embodiment, combined with the attached Figure 1As shown, a second roller is arranged on the end face of the second arc frame 5 facing the connecting pipe section 100, wherein a plurality of second rollers may be arranged at intervals, and the second roller is used to contact the small diameter section 300 of the connecting pipe section 100, and the second roller can prevent the second arc frame 5 from rubbing against the connecting pipe section 100.

[0051] Optionally, the bracket 3 includes a column 31, a beam 32, a vertical guide rail, a transverse guide rail, a transverse drive mechanism and a vertical drive mechanism, the column 31 is vertically mounted on the chassis 2, the column 31 is provided with the vertical guide rail, the beam 32 is slidably connected to the vertical guide rail, the transverse guide rail is provided on the beam 32, the first telescopic cylinder and the second telescopic cylinder 6 are respectively slidably connected to the transverse guide rail, the vertical drive mechanism is drivably connected to the beam 32, and is used to drive the beam 32 to slide in the vertical direction, and the transverse drive mechanism is drivably connected to the first telescopic cylinder and the second telescopic cylinder 6, respectively, and is used to drive the first telescopic cylinder and the second telescopic cylinder 6 to slide in the horizontal direction.

[0052] In this embodiment, combined with the attached Figure 1 As shown, the crossbeam 32 can be adjusted in the vertical direction (attached) by a vertical drive mechanism (not shown in the figure). Figure 1 The first telescopic cylinder and the second telescopic cylinder 6 can slide in the horizontal direction to adjust the relative height of the first induction heater and the second induction heater to the pipe section 100 in the vertical direction, wherein the vertical drive mechanism can be a vertical ball screw pair and a vertical servo motor installed on the column 31. The first telescopic cylinder and the second telescopic cylinder 6 can slide in the horizontal direction to adjust the relative height of the first induction heater and the second induction heater in the horizontal direction (attached Figure 1 The lateral driving mechanism can be a lateral ball screw pair and a lateral servo motor installed on the crossbeam 32, wherein the screw in the lateral ball screw pair is divided into a first section and a second section, wherein the thread directions of the first section and the second section are opposite, and the first telescopic cylinder and the second telescopic cylinder 6 are respectively threadedly connected to the first section and the second section, so that the lateral servo motor drives the lateral ball screw pair to realize the first induction heater and the second induction heater to move toward or away from each other in the horizontal direction.

[0053] Optionally, the electromagnetic induction heating device further comprises a turntable 10, wherein the turntable 10 comprises a base, a turntable and a slewing bearing, wherein the slewing bearing is connected between the base and the turntable, the base is arranged on the chassis 2, and the bracket 3 is arranged on the turntable.

[0054] In this embodiment, combined with the attached Figure 1As shown, a turntable 10 is installed between the chassis 2 and the bracket 3. The turntable 10 can be used to adjust the parallelism of the first induction heater and the second induction heater with the axis of the connecting pipe section 100 by the force generated by the first induction heater and the second induction heater being attached to the outer wall of the connecting pipe section 100.

[0055] In other embodiments, the bottom surface of the chassis 2 (attached Figure 1 Four electric universal wheels can be installed in the opposite direction of the middle Z axis to realize flexible adjustment of the overall position of the sensor (the first induction heater and the second induction heater).

[0056] In addition, the present invention also provides a method for heating a nuclear power RPV pipe section, based on the electromagnetic induction heating device as described above, the method comprising:

[0057] S1, placing the pipe section 100 on the roller 1;

[0058] S2, driving the first induction heater to move toward the large diameter section 200 close to the connecting pipe section 100 and maintaining a preset distance through the first telescopic cylinder, and driving the second induction heater to move toward the small diameter section 300 close to the connecting pipe section 100 and maintaining a preset distance through the second telescopic cylinder 6;

[0059] S3, starting the roller 1, starting the first induction heater and the second induction heater, adjusting the output power of the first induction heater and the second induction heater, preheating the connecting pipe section 100 before surfacing welding, and measuring the temperature;

[0060] S4, when the temperature reaches the surfacing requirement, surfacing welding is performed on the inner wall of the connecting pipe section 100, and the output power of the first induction heater and the second induction heater is adjusted to ensure the temperature between the welding layers;

[0061] S5, after the inner wall surfacing of the connecting pipe section 100 is completed, the output power of the first induction heater and the second induction heater are adjusted to increase the temperature, and the temperature is kept after reaching the post-weld heat treatment temperature;

[0062] S6, after the post-weld heat treatment time is reached, the first induction heater and the second induction heater are turned off, and the roller 1 is stopped at the same time.

[0063] In this embodiment, combined with the attached Figure 1 and attached Figure 2As shown, the pipe section 100 of the nuclear power RPV is placed on the roller 1, and the rotation of the roller 1 can drive the pipe section 100 to rotate along its axis. The electromagnetic induction heating device is divided into two sections for heating according to the diameter and length of the pipe section 100 of the nuclear power RPV (the diameter of the large diameter section 200 of the pipe section 100 is larger than the small diameter section 300, and the length of the large diameter section 200 is smaller than the small diameter section 300). Two separate induction heaters are used, namely the first induction heater and the second induction heater. In order to ensure the heating speed and uniformity, a heating device can be used around the pipe section 100 (see FIG. 2 ). Figure 1 The induction heater is symmetrically heated on both sides (in the X-axis direction), that is, there are four induction heaters in total, two of which (the first induction heater and the second induction heater) heat the large diameter part (large diameter section 200), and two (the first induction heater and the second induction heater) heat the small diameter part (small diameter section 300). When in use, the pipe section 100 of the nuclear power RPV is first placed on the roller 1, and then the first telescopic cylinder drives the first induction heater to move to the large diameter section close to the pipe section 100 and keep a certain distance, and the second telescopic cylinder drives the second induction heater to move to the small diameter section close to the pipe section 100 and keep a certain distance, and the roller 1 is started to drive the pipe section 100 to rotate along its axis, and the first induction heater and the second induction heater are started, and the output power of the first induction heater and the second induction heater is adjusted, and the pipe section 100 is preheated before surfacing welding, and the temperature is measured. When the temperature reaches the surfacing welding requirement, the inner wall of the pipe section 100 is surfacing, and the output power of the first induction heater and the second induction heater is adjusted to ensure the temperature between the welding layers. After the surfacing welding of the inner wall of the pipe section 100 is completed, the output power of the first induction heater and the second induction heater is adjusted, and the temperature is increased. After reaching the post-weld heat treatment temperature, the temperature is kept. After the post-weld heat treatment time is reached, the first induction heater and the second induction heater are turned off, and the roller 1 is stopped at the same time, thereby completing the heating work of the pipe section 100 of the nuclear power RPV.

[0064] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0065] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An electromagnetic induction heating device for heating a pipe section (100) of a nuclear power RPV, wherein the pipe section (100) comprises a large diameter section (200) and a small diameter section (300), characterized in that: The electromagnetic induction heating device comprises: a roller (1), a chassis (2), a bracket (3), a first induction heater, a second induction heater, a first telescopic cylinder and a second telescopic cylinder (6); the roller (1) is used to mount the pipe section (100) and drive the pipe section (100) to rotate along its own axis; the bracket (3) is arranged on the chassis (2); the fixed ends of the first telescopic cylinder and the second telescopic cylinder (6) are connected to the bracket (3) at intervals along an axial direction parallel to the pipe section (100); the telescopic end of the first telescopic cylinder is connected to the first induction heater and is used to drive the first induction heater to move toward the direction close to the large diameter section (200); the telescopic end of the second telescopic cylinder (6) is connected to the second induction heater and is used to drive the second induction heater to move toward the direction close to the small diameter section (300); and the first induction heater and the second induction heater are both arc-shaped.

2. The electromagnetic induction heating device according to claim 1, characterized in that: The first induction heater comprises a first arc-shaped frame (4) and a first induction heating cable, wherein the first induction heating cable is arranged in the first arc-shaped frame (4), and the first arc-shaped frame (4) is connected to the telescopic end of the first telescopic cylinder.

3. The electromagnetic induction heating device according to claim 2, characterized in that: The first arc frame (4) further comprises a third telescopic cylinder (7) and a fourth telescopic cylinder. The first arc frame (4) comprises a first arc plate, a second arc plate and a third arc plate. The two ends of the second arc plate are respectively hinged to the first arc plate and the third arc plate. The fixed end of the third telescopic cylinder (7) is connected to the bracket (3). The telescopic end of the third telescopic cylinder (7) is connected to the first arc plate. The fixed end of the fourth telescopic cylinder is connected to the bracket (3). The telescopic end of the fourth telescopic cylinder is connected to the third arc plate. The second arc plate is connected to the telescopic end of the first telescopic cylinder.

4. The electromagnetic induction heating device according to claim 2, characterized in that: The first induction heater further comprises a first roller, which is arranged on the end surface of the first arc-shaped frame (4) facing the connecting pipe section (100), and the first roller is used to contact the large diameter section (200) of the connecting pipe section (100).

5. The electromagnetic induction heating device according to claim 1, characterized in that: The first induction heater comprises a second arc-shaped frame (5) and a second induction heating cable, wherein the second induction heating cable is arranged in the second arc-shaped frame (5), and the second arc-shaped frame (5) is connected to the telescopic end of the second telescopic cylinder (6).

6. The electromagnetic induction heating device according to claim 5, characterized in that: The second arc frame (5) further comprises a fifth telescopic cylinder (8) and a sixth telescopic cylinder (9); the second arc frame (5) comprises a fourth arc plate, a fifth arc plate and a sixth arc plate; the two ends of the fifth arc plate are respectively hinged to the fourth arc plate and the sixth arc plate; the fixed end of the fifth telescopic cylinder (8) is connected to the bracket (3); the telescopic end of the fifth telescopic cylinder (8) is connected to the fourth arc plate; the fixed end of the sixth telescopic cylinder (9) is connected to the bracket (3); the telescopic end of the sixth telescopic cylinder (9) is connected to the sixth arc plate; and the fifth arc plate is connected to the telescopic end of the second telescopic cylinder (6).

7. The electromagnetic induction heating device according to claim 5, characterized in that: The first induction heater further comprises a second roller, which is arranged on the end surface of the second arc-shaped frame (5) facing the connecting pipe section (100), and the second roller is used for contacting the small diameter section (300) of the connecting pipe section (100).

8. The electromagnetic induction heating device according to claim 1, characterized in that: The support (3) comprises a column (31), a crossbeam (32), a vertical guide rail, a crossbeam, a cross-guide rail, a cross-drive mechanism and a vertical drive mechanism. The column (31) is vertically mounted on the chassis (2). The column (31) is provided with the vertical guide rail. The crossbeam (32) is slidably connected to the vertical guide rail. The crossbeam (32) is provided with the cross-guide rail. The first telescopic cylinder and the second telescopic cylinder (6) are respectively slidably connected to the cross-guide rail. The vertical drive mechanism is drivably connected to the crossbeam (32) and is used to drive the crossbeam (32) to slide in the vertical direction. The cross-drive mechanism is drivably connected to the first telescopic cylinder and the second telescopic cylinder (6) and is used to drive the first telescopic cylinder and the second telescopic cylinder (6) to slide in the horizontal direction.

9. The electromagnetic induction heating device according to claim 1, characterized in that: It also comprises a turntable (10), the turntable (10) comprising a base, a turntable and a turntable bearing, the turntable bearing being connected between the base and the turntable, the base being arranged on the chassis (2), and the bracket (3) being arranged on the turntable.

10. A method for heating a nuclear power RPV pipe section, characterized in that: Based on the electromagnetic induction heating device according to any one of claims 1 to 9, the method comprises: Placing the pipe section (100) on the roller (1); The first induction heater is driven by a first telescopic cylinder to move toward a large diameter section (200) close to the pipe section (100) and to maintain a preset distance, and the second induction heater is driven by a second telescopic cylinder (6) to move toward a small diameter section (300) close to the pipe section (100) and to maintain a preset distance; Starting the roller (1), starting the first induction heater and the second induction heater, adjusting the output power of the first induction heater and the second induction heater, preheating the connecting pipe section (100) before surfacing welding, and measuring the temperature; When the temperature reaches the cladding requirement, cladding the inner wall of the connecting pipe section (100) is performed, and at the same time, the output power of the first induction heater and the second induction heater is adjusted to ensure the temperature between the welding layers; After the inner wall surfacing of the pipe section (100) is completed, the output power of the first induction heater and the second induction heater are adjusted to increase the temperature, and after reaching the post-weld heat treatment temperature, the temperature is kept constant; After the post-weld heat treatment time is reached, the first induction heater and the second induction heater are turned off, and the roller (1) is stopped at the same time.

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