Nuclear power plant casing cutting device

Abstract

The present invention relates to a nuclear power plant casing cutting device, comprising: a cutting seat, on which a sleeve hole is provided, for being sleeved on the casing; a cutter disc, which can be rotatably mounted on the cutting seat along the circumference of the cutting seat; a cutting assembly, including a cutter, which can be radially movably mounted on the cutter disc; a driving mechanism, which is used to drive the cutter disc and the cutting assembly to rotate along the circumference of the cutting seat, and when the cutting assembly rotates to the feed position, the driving mechanism drives the cutting assembly to feed radially to cut the outer wall of the casing. The cutting assembly of the casing cutting device cuts the outer wall of the casing during the rotation process, and when the cutting assembly rotates to the feed position, it can be driven to feed the cutting action, further cutting the outer wall of the casing, and so on, until the casing is cut off. The casing has the characteristics of compact structure, good stability, simple operation, etc., and the operation process does not require on-site operation by personnel, and the cutting process is automated, without manual adjustment, with high efficiency, and reduces the working time of personnel in the irradiated environment.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power, and more particularly to a casing cutting device for a nuclear power plant. Background Art

[0002] In a pressurized water reactor nuclear power plant, the pressurizer is used to regulate the pressure of the reactor coolant system, and the pressurizer electric heater plays a key role in the pressure regulation process. The life of the pressurizer electric heater is generally lower than the design life of the reactor, which means that the faulty electric heater needs to be repaired and replaced.

[0003] Since the electric heaters of the voltage stabilizer are densely distributed at the bottom of the voltage stabilizer and are installed on the casing at the bottom of the voltage stabilizer by welding, and there are structural restrictions such as surge tubes around them, if a failed electric heater of the voltage stabilizer is replaced, it is first necessary to cut the connecting weld between the electric heater and the casing, but the cutting operation space between the electric heater and the casing is narrow.

[0004] At present, due to environmental factors such as small space and high radiation dose, the above cutting process is completed by manual operation, which has the disadvantages of complex preparation process and low work efficiency, and the cutting operators have to bear high radiation dose on site. In order to ensure the cutting quality, the existing manual operation requires a lot of preliminary preparation work and has low work efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a nuclear power plant casing cutting device which is convenient for cutting in view of the above-mentioned defects of the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is: construct a nuclear power plant casing cutting device, comprising:

[0007] A cutting seat, wherein the cutting seat is provided with a sleeve hole for sleeve-mounting on the sleeve;

[0008] A cutter disc is rotatably mounted on the cutting seat along the circumference of the cutting seat;

[0009] A cutting assembly, including a cutter, is radially movably mounted on the cutter disc;

[0010] The driving mechanism is used to drive the cutter disc and the cutting assembly to rotate along the circumference of the cutting seat, and when the cutting assembly rotates to the feed position, it is driven by the driving mechanism to perform radial feed to cut the outer wall of the sleeve.

[0011] In some embodiments, the cutter disc is annular, and is provided with teeth in the circumferential direction. The driving mechanism includes a driving gear, and the driving gear is engaged with the teeth to drive the cutter disc and the cutting assembly to rotate in the circumferential direction of the cutting seat.

[0012] In some embodiments, a rotation groove for rotatably mounting the cutter disc is circumferentially provided on the cutting seat, the cutter disc includes a rotating cylinder rotatably matched with the rotation groove, and a rolling mechanism rollingly matched with the rotating cylinder is provided in the rotation groove.

[0013] In some embodiments, the rolling mechanism includes a plurality of rotating wheels distributed circumferentially in the rotating groove, each of the rotating wheels being rotatably arranged and rollingly engaged with the rotating cylinder.

[0014] In some embodiments, the outer ring of the rotating wheel is provided with a positioning groove, and the inner wall surface of the rotating cylinder is provided with an annular protrusion along the circumference, and the annular protrusion is inserted into each of the positioning grooves.

[0015] In some embodiments, the rotating groove is located at one end of the cutting seat, the teeth are located on the outer ring of the rotating cylinder, the driving mechanism is installed on the outside of the cutting seat, and the outer wall surface of the cutting seat is provided with an engagement opening for the driving gear to be inserted into and engage with the teeth.

[0016] In some embodiments, the nuclear power plant casing cutting device includes at least two cutting assemblies distributed along the circumference of the cutter head.

[0017] In some embodiments, the cutting assembly further comprises a knife seat for mounting the knife, and the knife seat is radially movably mounted on the knife disc;

[0018] The cutter disc is provided with a transmission mechanism connected to the cutting assembly, and the transmission mechanism includes a triggering member for triggering the driving mechanism. When the cutting assembly rotates to the feed position, the driving mechanism triggers the triggering member to drive the cutting assembly to feed radially.

[0019] In some embodiments, the transmission mechanism further includes a support seat and a transmission rod, wherein the support seat is mounted on the cutter disc, and the transmission rod is rotationally matched with the support seat and threadedly matched with the cutter seat;

[0020] The triggering member is mounted on the transmission rod, and drives the transmission rod to rotate after being triggered by the driving mechanism.

[0021] In some embodiments, the trigger member is a gear, and the driving mechanism includes a trigger head. The trigger head and the trigger member are arranged axially staggered so that when the rotation of the cutter disc drives the trigger member to rotate to the feed position where the trigger head is located, the trigger head can be inserted into the tooth groove of the gear. The trigger head drives the trigger member to rotate, driving the cutting assembly to feed radially.

[0022] In some embodiments, the radial position of the trigger head is adjustable to adapt to the radial position of the trigger member.

[0023] In some embodiments, the driving mechanism includes a driving seat, and the driving seat is provided with a guide groove for guiding the radial movement of the trigger head.

[0024] In some embodiments, a side of the drive seat adjacent to the trigger member is provided with an escape opening for exposing the trigger head, and the drive mechanism also includes an adjusting head connected to the trigger head, and the adjusting head radially passes through the drive seat, so that the adjusting head drives the trigger head to move radially.

[0025] The implementation of the nuclear power plant casing cutting device of the present invention has the following beneficial effects: the cutting component of the nuclear power plant casing cutting device can cut the outer wall of the casing during the rotation process. At the same time, when the cutting component rotates to the feed position, it can also be driven to perform the feed action to further cut the outer wall of the casing, and this cycle is repeated until the casing is cut off. It has the characteristics of compact structure, good stability, and simple operation. The operation process does not require on-site operation by personnel, and the cutting process is automated without manual adjustment, which is efficient and reduces the working time of personnel in the irradiated environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 It is a schematic diagram of the assembly structure of a nuclear power plant casing cutting device in an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the exploded structure of the casing cutting device of the nuclear power plant;

[0029] Figure 3 yes Figure 1 Schematic cross-section of the casing cutting device of the nuclear power plant. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0031] like Figures 1 to 3 As shown, a nuclear power plant casing cutting device in a preferred embodiment of the present invention includes a cutting seat 1, a cutter head 2, a cutting assembly 3, and a driving mechanism 4.

[0032] The cutting seat 1 is provided with a sleeve hole 11. Usually, the inner diameter of the sleeve hole 11 is equivalent to the diameter of the sleeve of the electric heater. It is used to be sleeved on the sleeve of the electric heater to make the position after sleeve connection more stable and less prone to shaking, which is convenient for the cutting component 3 to cut the sleeve.

[0033] The cutter disc 2 is rotatably mounted on the cutting seat 1 along the circumference of the cutting seat 1, and the cutting assembly 3 is mounted on the cutter disc 2 and rotates with the cutter disc 2. The cutting assembly 3 includes a cutter 31, which is radially movably mounted on the cutter disc 2 to perform feed cutting.

[0034] The driving mechanism 4 is used to drive the cutter disc 2 and the cutting assembly 3 to rotate along the circumferential direction of the cutting seat 1, and when the cutting assembly 3 rotates to the feed position, it is driven by the driving mechanism 4 to perform radial feed to cut the outer wall of the casing.

[0035] The cutting component 3 cuts the outer wall of the casing during its rotation. At the same time, when the cutting component 3 rotates to the feed position, it can also be driven to perform the feed action to further cut the outer wall of the casing. This cycle is repeated until the casing is cut off. It has the characteristics of compact structure, good stability, and simple operation. The operation process does not require on-site operation by personnel, and the cutting process is automated without manual adjustment. It is highly efficient and reduces the working hours of personnel in the irradiated environment.

[0036] Furthermore, in the present embodiment, the cutter disc 2 is annular and is arranged concentrically with the cutting seat 1. It can rotate concentrically relative to the cutting seat 1, so that the cutting of the tool 31 is more uniform. Specifically, in the present embodiment, a rotation groove 12 is provided on the cutting seat 1 along the circumference for the cutter disc 2 to be rotatably installed, so that the cutter disc 2 and the rotation groove 12 can be rotated and matched, and the positioning is more accurate. In other embodiments, the cutter disc 2 and the cutting seat 1 can also be arranged side by side in the axial direction and rotate relative to the cutting seat 1. The cutter disc 2 may not be annular, so that the driving mechanism 4 drives the cutter disc 2 to rotate along the circumference of the cutting seat 1.

[0037] Preferably, in this embodiment, teeth 21 are provided on the cutter disc 2 along the circumferential direction, and the driving mechanism 4 includes a driving gear 41, which meshes with the teeth 21. The driving gear 41 rotates under the drive of the motor, driving the cutter disc 2 and the cutting assembly 3 to rotate along the circumferential direction of the cutting seat 1, so that the driving gear 41 of the driving mechanism 4 meshes with the cutter disc 2, which can reduce transmission and make the structure more compact.

[0038] In order to keep the cutter disc 2 concentric with the cutting seat 1 during rotation, the cutter disc 2 includes a rotating cylinder 22 that rotates with the rotating groove 12. A rolling mechanism 14 that rolls with the rotating cylinder 22 is provided in the rotating groove 12. During the rotation of the cutter disc 2, the rolling mechanism 14 positions the rotating cylinder 22 to minimize vibration during the processing, thereby improving processing accuracy and equipment reliability.

[0039] In this embodiment, the rolling mechanism 14 includes a plurality of rotating wheels 141 distributed circumferentially in the rotating groove 12. Each rotating wheel 141 is rotatably arranged and rollingly cooperates with the rotating cylinder 22. It can guide and position the rotation of the cutter disc 2, and can also control the center of the cutter disc 2 to avoid vibration caused by the deviation of the cutter disc 2.

[0040] In order to position the cutter disc 2 in both the axial and radial directions, a positioning groove 142 is provided on the outer ring of the rotating wheel 141, and an annular protrusion 23 is provided on the inner wall surface of the rotating cylinder 22 along the circumferential direction. The annular protrusion 23 is inserted into each positioning groove 142. During the rotation of the cutter disc 2, the annular protrusion 23 remains engaged with the positioning groove 142 of the outer ring of each rotating wheel 141. The rotating wheel 141 rotates, which also guides and positions the rotation of the cutter disc 2. Preferably, in this embodiment, the rotation axis of the rotating wheel 141 is parallel to the axis of the sleeve hole 11, so that the axial positioning of the cutter disc 2 is more accurate and stable.

[0041] In this embodiment, the rotation groove 12 is located at one end of the cutting seat 1, and the teeth 21 are located at the outer ring of the rotating cylinder 22. The driving mechanism 4 is installed on the outer side of the cutting seat 1, and the outer wall surface of the cutting seat 1 is provided with an engagement opening 13 for the driving gear 41 to be inserted and engaged with the teeth 21. The driving mechanism 4 directly drives the cutter disc 2 to rotate on the outer side of the cutting seat 1, which can save transmission space. In other embodiments, the rotation groove 12 can also be located at the outer edge of the end of the cutting seat 1, so that the cutter disc 2 can be rotatably installed.

[0042] Of course, the drive mechanism 4 can also cooperate with other exposed parts of the cutter disc 2 to drive the cutter disc 2 to rotate relative to the cutting seat 1. In addition to using gear transmission, the drive mechanism 4 can also use belt transmission or turbine transmission to drive the cutter disc 2 to rotate relative to the cutting seat 1.

[0043] In this embodiment, the nuclear power plant casing cutting device includes two cutting assemblies 3 distributed along the circumference of the cutter disc 2. During the rotation of the cutter disc 2, the two cutting assemblies 3 perform cutting at different positions respectively, thereby improving the cutting efficiency. It can be understood that in other embodiments, the number of cutting assemblies 3 can also be one or more, and cutting can be performed separately.

[0044] In some embodiments, the cutting assembly 3 further includes a knife seat 32 for mounting the knife 31, and the knife seat 32 can be radially movably mounted on the knife disc 2, and can be radially moved to achieve knife feeding under the action of external force. Preferably, the knife disc 2 is provided with a slide groove 25 for slidingly mounting the knife seat 32, and the slide groove 25 is a dovetail groove, which can play a role in guiding and preventing escape. It can be understood that in other embodiments, the knife seat 32 can also be eliminated, so that the knife 31 is directly mounted on the knife disc 2, and the knife 31 is driven to move radially to achieve knife feeding.

[0045] Furthermore, a transmission mechanism 24 connected to the cutting assembly 3 is provided on the cutter disc 2, and the transmission mechanism 24 includes a trigger member 241 for triggering the driving mechanism 4. When the cutting assembly 3 rotates to the feed position, the driving mechanism 4 triggers the trigger member 241 to drive the cutting assembly 3 to feed radially, so that the cutting assembly 3 is triggered to automatically feed after the previous feed cutting is completed.

[0046] In some embodiments, the transmission mechanism 24 further includes a support seat 242 and a transmission rod 243. The support seat 242 is mounted on the cutter disc 2. The transmission rod 243 is rotationally matched with the support seat 242 and threadedly matched with the cutter seat 32. The trigger member 241 is mounted on the transmission rod 243 and drives the transmission rod 243 to rotate after being triggered by the driving mechanism 4.

[0047] Specifically, in this embodiment, the trigger member 241 is a gear mounted on the transmission rod 243. The trigger member 241 rotates, driving the transmission rod 243 to rotate, thereby driving the cutting assembly 3 to move radially to achieve cutting. In other embodiments, the trigger member 241 may also be directly threaded with the knife holder 32, or, by means of electrical control, the trigger member 241 generates a stepping signal after being triggered, and drives the cutting assembly 3 to advance through a motor or the like.

[0048] Furthermore, in this embodiment, the driving mechanism 4 also includes a trigger head 42, and the trigger head 42 and the trigger member 241 are arranged axially in an alternate manner, so that when the cutter disc 2 rotates to drive the trigger member 241 to rotate to the feed position where the trigger head 42 is located, the trigger head 42 can be inserted into the tooth groove of the trigger member 241, and the trigger head 42 drives the trigger member 241 to rotate, thereby driving the cutting assembly 3 to feed radially.

[0049] Preferably, the radial position of the trigger head 42 is adjustable to adapt to the radial position of the trigger member 241. After the trigger member 241 moves radially, the radial position of the trigger head 42 can be adjusted so that the trigger head 42 can continue to trigger the trigger member 241. Of course, the radial width of the trigger head 42 and the trigger member 241 can also be increased so that the two can always contact and trigger.

[0050] In this embodiment, the driving mechanism 4 also includes a driving seat 43, and the driving gear 41 is rotatably mounted on the driving seat 43. In addition, the driving seat 43 is provided with a guide groove 431 for guiding the radial movement of the trigger head 42, which not only provides support for the trigger head 42, but also realizes the radial position adjustment of the trigger head 42, and also ensures the stability and accuracy of the position movement.

[0051] Specifically, in this embodiment, a side of the drive seat 43 adjacent to the trigger member 241 is provided with an escape opening 432 for exposing the trigger head 42. After the trigger head 42 is exposed, it can collide with the trigger member 241 to achieve triggering. In addition, in order to facilitate the adjustment of the radial position of the trigger head 42, the drive mechanism 4 also includes an adjustment head 44 connected to the trigger head 42. The adjustment head 44 radially passes through the drive seat 43, so that the adjustment head 44 drives the trigger head 42 to move radially. Preferably, the adjustment head 44 can be screwed with the trigger head 42, and when the adjustment head 44 is rotated, the trigger head 42 is driven to move radially along the guide groove 431. Of course, the trigger head 42 can also be directly dragged to move radially.

[0052] Furthermore, in order to clamp and fix the casing more stably, the cutting device also includes two clamping mechanisms 5, which can be clamped at the two ends of the cutting seat 1 and the cutter disc 2 respectively, so that the cutting seat 1, the cutter disc 2, the driving mechanism 4, etc. are located between the two clamping mechanisms 5. When the clamping mechanism 5 clamps the casing, the cutting seat 1, the cutter disc 2, the driving mechanism 4, etc. in the middle are more stable and less likely to shake.

[0053] The clamping mechanism 5 includes two rotatably connected clamping arms 51 and a force-applying component 52 such as a cylinder and a motor that drives the two clamping arms 51 to open and close. A clamping hole for clamping the sleeve is formed between the two clamping arms 51. When the clamping arms 51 are closed, the clamping hole clamps the sleeve, and when the clamping arms 51 are opened, the sleeve is released.

[0054] After the casing is cut, the drive gear 41 is reversed to complete the retraction of the cutter, and after the two clamping mechanisms 5 are released, the cutting seat 1, the cutter disc 2, the drive mechanism 4, etc. can be removed to complete the cutting steps and carry out subsequent work.

[0055] In addition, in order to facilitate the transportation of the nuclear power plant casing cutting device, a support frame 6 can also be set. The support frame 6 may include a support seat 61 and a support column 62. A through hole 611 is provided in the middle of the support seat 61 for the casing to pass through. The support column 62 extends axially upward from the support seat 61. The lower end of the casing tube can be placed on the supporting surface, and the support column 62 can be supported on the end face of the cutter disc 2 to provide support for the cutting seat 1, the cutter disc 2, the driving mechanism 4, etc.

[0056] It can be understood that the above-mentioned technical features can be used in any combination without limitation.

[0057] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A nuclear power plant casing cutting device, characterized in that: include: A cutting seat (1), wherein the cutting seat (1) is provided with a sleeve hole (11) for being sleeved onto a sleeve; A cutter disc (2) is mounted on the cutting seat (1) so as to be rotatable along the circumference of the cutting seat (1); A cutting assembly (3), comprising a cutter (31), mounted on the cutter disc (2) in a radially movably manner; A driving mechanism (4) is used to drive the cutter disc (2) and the cutting assembly (3) to rotate along the circumference of the cutting seat (1); when the cutting assembly (3) rotates to a cutting position, it is driven by the driving mechanism (4) to perform radial cutting to cut the outer wall of the casing; The cutter disc (2) is annular, and teeth (21) are provided on the cutter disc (2) along the circumferential direction. The driving mechanism (4) comprises a driving gear (41), and the driving gear (41) is meshed with the teeth (21) to drive the cutter disc (2) and the cutting assembly (3) to rotate along the circumferential direction of the cutting seat (1); The cutting seat (1) is provided with a rotating groove (12) along the circumferential direction for the cutter disc (2) to be rotatably mounted, the cutter disc (2) comprising a rotating cylinder (22) rotatably matched with the rotating groove (12), and a rolling mechanism (14) rollingly matched with the rotating cylinder (22) is provided in the rotating groove (12); The rolling mechanism (14) comprises a plurality of rotating wheels (141) distributed along the circumferential direction in the rotating groove (12), each of the rotating wheels (141) being rotatably arranged and rollingly cooperating with the rotating cylinder (22); The cutting assembly (3) further comprises a knife seat (32) for mounting the knife (31), wherein the knife seat (32) is mounted on the knife disc (2) in a radially movable manner; The cutter disc (2) is provided with a transmission mechanism (24) connected to the cutting assembly (3); the transmission mechanism (24) comprises a triggering member (241) for being triggered by the driving mechanism (4); when the cutting assembly (3) rotates to the cutting feed position, the driving mechanism (4) triggers the triggering member (241) to drive the cutting assembly (3) to radially feed; The transmission mechanism (24) further comprises a support seat (242) and a transmission rod (243); the support seat (242) is mounted on the cutter disc (2); the transmission rod (243) is rotationally engaged with the support seat (242) and is threadedly engaged with the cutter seat (32); The trigger member (241) is mounted on the transmission rod (243), and drives the transmission rod (243) to rotate after being triggered by the driving mechanism (4).

2. The nuclear power plant casing cutting device according to claim 1, characterized in that: The outer ring of the rotating wheel (141) is provided with a positioning groove (142), and the inner wall surface of the rotating cylinder (22) is provided with an annular protrusion (23) along the circumference, and the annular protrusion (23) is inserted into each of the positioning grooves (142).

3. The nuclear power plant casing cutting device according to claim 1 or 2, characterized in that: The rotating groove (12) is located at one end of the cutting seat (1), the teeth (21) are located on the outer ring of the rotating cylinder (22), the driving mechanism (4) is installed on the outer side of the cutting seat (1), and the outer wall surface of the cutting seat (1) is provided with an engagement opening (13) for the driving gear (41) to be inserted into and engage with the teeth (21).

4. The nuclear power plant casing cutting device according to claim 1, characterized in that: The nuclear power plant casing cutting device comprises at least two cutting assemblies (3) distributed along the circumference of the cutter head (2).

5. The nuclear power plant casing cutting device according to claim 1, characterized in that: The trigger member (241) is a gear, and the driving mechanism (4) comprises a trigger head (42). The trigger head (42) and the trigger member (241) are arranged alternately in the axial direction, so that when the knife disc (2) rotates to drive the trigger member (241) to rotate to the feed position where the trigger head (42) is located, the trigger head (42) can be inserted into the tooth groove of the gear, and the trigger head (42) drives the trigger member (241) to rotate, thereby driving the cutting assembly (3) to feed radially.

6. The nuclear power plant casing cutting device according to claim 5, characterized in that: The radial position of the trigger head (42) is adjustable to adapt to the radial position of the trigger member (241).

7. The nuclear power plant casing cutting device according to claim 6, characterized in that: The driving mechanism (4) comprises a driving seat (43), and the driving seat (43) is provided with a guide groove (431) for guiding the radial movement of the trigger head (42).

8. The nuclear power plant casing cutting device according to claim 7, characterized in that: A side of the drive seat (43) adjacent to the trigger member (241) is provided with an escape opening (432) for exposing the trigger head (42). The drive mechanism (4) further comprises an adjustment head (44) connected to the trigger head (42). The adjustment head (44) radially passes through the drive seat (43) so that the adjustment head (44) drives the trigger head (42) to move radially.

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