A cutting device for control rod guide tubes of nuclear power plants

Abstract

The present invention discloses a control rod guide cylinder cutting device for a nuclear power plant, comprising a guiding mechanism, a clamping mechanism, a cutting mechanism and a recovery mechanism. The length direction of the guide cylinder is vertical, the guiding mechanism is located above the clamping mechanism, and the recovery mechanism is located below the clamping mechanism. The guiding mechanism is used to keep the guide cylinder vertical when clamped by the clamping mechanism, the clamping mechanism is used to clamp the guide cylinder, and the recovery mechanism is used to collect the guide cylinder cut pieces that fall after cutting. The cutting direction of the cutting mechanism is perpendicular to the guide cylinder. The control rod guide cylinder cutting device for a nuclear power plant of the present invention can realize automatic cutting of the control rod guide cylinder, making the control rod guide cylinder cutting and preparation process more efficient and safer, effectively preparing and disposing of the decommissioned and dismantled control rod guide cylinder, and is easy to operate.

Description

Technical Field

[0001] The present invention particularly relates to a control rod guide tube cutting device for a nuclear power plant. Background Art

[0002] Currently, my country lacks experience in decommissioning nuclear power plants and handling radioactive metal waste. Military nuclear facility decommissioning waste treatment technologies differ in process design and scale, and are still in the development and implementation stages. The primary function of control rod guide cylinders during nuclear power plant operation is to guide control rods and ensure that rod drop times meet nuclear safety requirements. As units age and gradually retire, dismantled control rod guide cylinders require maintenance and disposal.

[0003] For high-dose radioactive old control rod guide tubes (with an overall length of 4 meters), current disposal solutions at home and abroad tend to place the guide tube as a whole in a customized, dedicated large-scale disposal unit and perform volume expansion disposal through cement solidification. This solution cannot reduce the output of radioactive waste and is not conducive to subsequent transportation and disposal. Therefore, there is an urgent need to provide a cutting device for control rod guide tubes to effectively dispose of retired guide tubes and avoid generating a large amount of radioactive waste during the cutting process. In addition, the guide tubes are placed vertically when in use or when stored after decommissioning. They are large in size and need to be hoisted or transported using a sling, which makes it inconvenient to change their vertical placement state. Otherwise, not only will the operation be troublesome, but the time and dose of radiation received by personnel will also be increased. Therefore, a cutting device is required to adapt to the requirement of vertical placement of the guide tubes. Summary of the Invention

[0004] In view of this, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a control rod guide tube cutting device for a nuclear power plant, which can cut and decompose the decommissioned and dismantled control rod guide tubes, effectively dispose of the radioactive guide tubes, and reduce the radiation dose of the workers.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A nuclear power plant control rod guide tube cutting device includes a guiding mechanism, a clamping mechanism, a cutting mechanism and a recovery mechanism. The length direction of the guide tube is vertical. The guiding mechanism is located above the clamping mechanism, and the recovery mechanism is located below the clamping mechanism. The guiding mechanism is used to keep the guide tube vertical when clamped by the clamping mechanism. The clamping mechanism is used to clamp the guide tube. The recovery mechanism is used to collect the guide tube cut pieces that fall after cutting. The cutting direction of the cutting mechanism is perpendicular to the guide tube.

[0007] By setting up a guiding mechanism, a clamping mechanism, a cutting mechanism and a recovery mechanism, etc., the control rod guide tube can be automatically cut, and the control rod guide tube cutting and preparation process can be made more efficient and safer. In addition, the length direction of the guide tube is vertical, which matches the placement state of the control rod guide tube during storage. The guide tube is also placed vertically when stored. When cutting, it is directly placed vertically into the guide mechanism without changing direction, which is convenient for operation. At the same time, the number of times the staff comes into contact with the radioactive guide tube is reduced, which can reduce the radiation dose of the staff and improve safety.

[0008] According to some preferred embodiments of the present invention, the device further includes a shielding cover, a frame, and a support platform. The shielding cover is provided with a passage for the guide cylinder to enter. The guide cylinder is parallel to the length of the shielding cover, and the guide cylinder vertically downward from the top of the shielding cover into the passage and the guide mechanism. The guide mechanism, clamping mechanism, and cutting mechanism are all located within the frame. The shielding cover is located at the top of the frame and communicates with the frame. The frame is located on the support platform and fixedly connected to the support platform. The shielding cover can shield the radioactivity of the guide cylinder before it enters the guide mechanism, thereby reducing the radiation dose. In some embodiments of the present invention, the shielding cover is not fixedly connected to the frame. During the cutting process, the shielding cover is simply placed on a support plate provided at the top of the frame. The shielding cover can be removed from the top of the frame and used to hoist the guide cylinder and transfer it from the storage bin to the cutting device. The shielding cover can also shield the radioactivity of the guide cylinder during transfer.

[0009] According to some preferred embodiments of the present invention, the guide mechanism is located below the shielding cover and includes an upper guide portion and a lower guide portion arranged in parallel. The upper guide portion is located above the lower guide portion. The upper guide portion includes a first clamping hook and a second clamping hook arranged symmetrically, and the lower guide portion includes a third clamping hook and a fourth clamping hook arranged symmetrically. The guide mechanism is configured to ensure that the guide cylinder remains vertical as it enters downward from the shielding cover, preventing the guide cylinder from tilting, which would be detrimental to cutting.

[0010] According to some preferred embodiments of the present invention, a first frame is formed between the first clamping hook and the second clamping hook, and a second frame is formed between the third clamping hook and the fourth clamping hook. The centers of the first frame, the second frame and the guide tube are all located in the same vertical direction.

[0011] According to some preferred embodiments of the present invention, the first enclosure and / or the second enclosure include a first angle and a second angle that are symmetrical to each other, and a third angle and a fourth angle that are symmetrical to each other; the first angle, the second angle, the third angle, and the fourth angle correspond to the edges of the outer wall of the guide tube. In some embodiments of the present invention, the guide tube includes a cylindrical upper guide tube portion and a square lower guide tube portion with an edged outer wall. For the lower guide tube portion with an edged outer wall, at least one of the first enclosure and the second enclosure is provided with a first angle, a second angle, a third angle, and a fourth angle, so that when the guide tube is extended into the guide mechanism, the four edges on the outer wall of the square tube portion can match the first angle, the second angle, the third angle, and the fourth angle respectively, and the guide tube will not tilt or shake at will, thereby ensuring that the guide tube always remains in a vertical state when it is extended downward.

[0012] According to some preferred embodiments of the present invention, the clamping mechanism is located below the guide mechanism and includes an upper clamping portion and a lower clamping portion arranged in parallel, each of which includes a clamped state and an open state. The upper clamping portion includes a first clamping member and a second clamping member arranged symmetrically, and the lower clamping portion includes a third clamping member and a fourth clamping member arranged symmetrically, the first clamping member and the second clamping member being located in the same horizontal direction, and the third clamping member and the fourth clamping member being located in the same horizontal direction. The arrangement of the clamping mechanism facilitates keeping the guide cylinder fixed during cutting.

[0013] According to some preferred embodiments of the present invention, the clamping mechanism further comprises a first driver connected to the first clamping member, a second driver connected to the second clamping member, a third driver connected to the third clamping member, and a fourth driver connected to the fourth clamping member; the first driver and the second driver are used to drive the upper clamping portion to be in the clamping state or the open state, and the third driver and the fourth driver are used to drive the lower clamping portion to be in the clamping state or the open state. In some embodiments of the present invention, the movements of the upper clamping portion and the lower clamping portion are not completely synchronized, and the two are controlled by different drivers. When the guide cylinder is cutting, the upper clamping portion and the lower clamping portion both tightly clamp the portion to be cut of the guide cylinder, and the cutting mechanism cuts the portion between the upper clamping portion and the lower clamping portion. When the cutting is completed, the lower clamping portion is released and is in an open state, allowing the cut guide cylinder to fall downward into the recovery mechanism, while the upper clamping mechanism is still in a clamping state, tightly clamping the guide cylinder to prevent the guide cylinder from falling. In some embodiments of the present invention, the clamping mechanism is a hydraulic clamping mechanism, and the hydraulic control cabinet provides power for the hydraulic clamping mechanism.

[0014] According to some preferred embodiments of the present invention, the cutting mechanism includes a saw blade, a cutting motor, a gearbox, a reducer, a fixed frame, and a slide rail. The saw blade is positioned between the upper and lower clamping portions. The saw blade is connected to the reducer via the reducer output shaft, the gearbox is connected to the reducer, and the output shaft of the cutting motor is connected to the gearbox. The cutting motor and gearbox are both fixedly connected to the fixed frame, which is slidably connected to the slide rail, with the fixed frame moving perpendicularly to the guide cylinder. In some embodiments of the present invention, the saw blade is a spark-free cutting saw blade coated with a metal-ceramic coating, eliminating the need for lubricants, coolants, etc. during the cutting process. The cutting motor controls the rotation of the saw blade to cut the guide cylinder. The slide rail facilitates adjustment of the distance between the cutting mechanism and the guide cylinder. When cutting is not required, the fixed frame can be moved on the slide rail to move the saw blade and other components away from the guide cylinder. When cutting is required, the saw blade can be moved closer to the guide cylinder. In addition, a cutting motor protective cover is provided on the outside of the cutting motor to protect the cutting motor from damage.

[0015] According to some preferred embodiments of the present invention, the cutting mechanism includes a feed motor, which is connected to the fixed frame via a screw rod. The feed motor is used to drive the fixed frame to move, thereby facilitating adjustment of the distance between the saw blade and the guide cylinder.

[0016] According to some preferred embodiments of the present invention, the cutting mechanism also includes a saw blade protective cover for accommodating the saw blade, the output shaft of the reducer passes through the thickness direction of the saw blade protective cover, and a notch is provided on the side of the saw blade protective cover close to the guide cylinder, and the notch is used to expose part of the saw blade outside the saw blade protective cover.

[0017] According to some preferred embodiments of the present invention, the frame includes a first frame portion and a second frame portion that are interconnected, and the guide mechanism and the clamping mechanism are located in the first frame portion; the saw blade and the gear box portion of the cutting mechanism are located in the first frame portion, and a baffle is provided between the first frame portion and the second frame portion; an accordion cover is provided on the outside of the cutting mechanism, and the portion of the cutting mechanism located in the second frame portion is all located in the accordion cover, and the open end of the accordion cover is connected to the baffle. The outside of the entire cutting mechanism is covered with an accordion cover, which can contain the radioactive contamination generated by the cutting guide cylinder. In addition, a fan is provided inside the accordion cover for cooling the saw blade and the guide cylinder in real time during the cutting process to avoid excessively high cutting temperatures. The accordion cover can be stretched and contracted, and is easy to operate.

[0018] According to some preferred embodiments of the present invention, the first frame portion comprises a first accommodating portion, a second accommodating portion, a third accommodating portion and a fourth accommodating portion, the first accommodating portion is located at the upper end portion of the first frame portion, the second accommodating portion is located on the left side below the first accommodating portion, the third accommodating portion and the fourth accommodating portion are located on the right side below the first accommodating portion, and the third accommodating portion is located above the fourth accommodating portion; the guide mechanism is located in the first accommodating portion, the clamping mechanism is located in the second accommodating portion, the first accommodating portion is communicated with the second accommodating portion, the second accommodating portion is communicated with the third accommodating portion, the third accommodating portion is communicated with the fourth accommodating portion, the bottom of the second accommodating portion is flush with the bottom of the third accommodating portion, and the bottoms of the second accommodating portion and the third accommodating portion both have openings, and the openings at the bottom of the second accommodating portion and the third accommodating portion are provided to ensure that the cut guide cylinder cut pieces can fall downward into the recovery mechanism after cutting.

[0019] According to some preferred embodiments of the present invention, the guide mechanism further includes a guide member disposed below the clamping mechanism, wherein a top surface of the guide member is connected to a bottom of the fourth accommodating portion, the guide member is partially located in the second accommodating portion, and a remaining portion of the guide member is located in the third accommodating portion. A feed port is defined on a bottom surface of the guide member. The guide member is configured to guide the cut guide cylinder pieces into a designated area of the recovery mechanism after cutting.

[0020] According to some preferred embodiments of the present invention, the recycling mechanism includes a recycling bucket. When the cutting mechanism cuts the guide cylinder, the recycling bucket is located below the guide member and the feed port is docked with the top of the recycling bucket. The diameter of the feed port is larger than the inner diameter of the recycling bucket and smaller than the outer diameter of the recycling bucket. The guide member is accurately docked with the recycling bucket to prevent the radioactive guide cylinder cut piece from falling to the outside, causing radioactive leakage and endangering the health of the workers. Moreover, when the feed port is well docked with the opening of the recycling bucket, the position of the entire cutting mechanism is well sealed, which can minimize the radioactive contamination generated during cutting. In some embodiments of the present invention, the recycling bucket can be a standard concrete bucket for solid waste treatment in nuclear power plants.

[0021] According to some preferred embodiments of the present invention, a partition plate is provided in the recycling bin, the partition plate is parallel to the top surface of the recycling bin, a plurality of through holes are provided on the partition plate, the inner diameter of the through hole is larger than the outer diameter of the guide cylinder cutting piece, and the distance from the partition plate to the bottom surface of the interior of the recycling bin is smaller than the length of the guide cylinder cutting piece. In some embodiments of the present invention, each through hole on the partition plate has the same size, and when collecting the cut guide cylinder cutting pieces, one through hole corresponds to one guide cylinder cutting piece, and by adjusting the position of the recycling bin, the guide cylinder cutting pieces fall into the recycling bin from different through holes on the partition plate; and the distance from the partition plate to the bottom surface of the interior of the recycling bin is smaller than the length of the guide cylinder cutting piece, which can prevent the guide cylinder cutting pieces that fall into the recycling bin from stacking together, causing the guide cylinder cutting pieces in the recycling bin to be placed in a messy manner, and effectively reducing the volume for storing the guide cylinder cutting pieces.

[0022] According to some preferred embodiments of the present invention, the recycling mechanism further includes a turntable, a fixed plate, a bottom frame, and a guide rail. The recycling bucket is located on the turntable, one end of the guide rail is located below the clamping mechanism, and the other end of the guide rail is away from the support platform. The turntable is rotatably connected to the fixed plate, the fixed plate is fixedly connected to the bottom frame, and the bottom frame is slidably connected to the guide rail. The back-and-forth movement of the bottom frame on the guide rail drives the fixed plate, the turntable, and the recycling bucket to move relative to the guide rail as a whole, so that during the cutting process, the recycling bucket can be moved to the bottom of the guide cylinder to collect the guide cylinder cuttings. When the cutting is completed, the recycling bucket is moved outward from the bottom of the guide cylinder, and the guide cylinder cuttings are promptly transported away. The entire operation process is simple and efficient. By rotating the turntable, the recycling bucket can be rotated, which facilitates the adjustment of the position of the through holes opened on the partition plate in the recycling bucket, so that the guide cylinder cuttings can fall into the recycling bucket at different through holes.

[0023] According to some preferred embodiments of the present invention, a plurality of stoppers are provided on the top surface of the turntable, and the stoppers abut against the outer wall of the recycling bin. The plurality of stoppers are used to limit the position of the recycling bin fixed to the turntable, preventing the recycling bin from falling off the turntable during movement, and ensuring that the recycling bin is fixed in place on the turntable.

[0024] According to some preferred embodiments of the present invention, the recycling mechanism further includes a first motor and a second motor, the first motor being used to drive the bottom frame to move along the length direction of the guide rail, and the second motor being used to drive the turntable to rotate. The second motor drives the turntable to rotate, which in turn drives the recycling barrel to rotate, so as to facilitate adjustment of the position of the through holes on the partition plate in the recycling barrel below the guide cylinder, so that the guide cylinder cutting pieces can accurately fall into the recycling barrel from different through holes. In some embodiments of the present invention, a sensor is provided on the side of the fixed plate close to the turntable, and an iron block is provided on the bottom of the turntable close to the fixed plate. During the rotation process, when the iron block touches the sensor, the position of the turntable at this time is positioned as the origin position. Thereafter, the angle of rotation of the turntable can be directly controlled so that the different through holes on the partition plate can all be located directly below the guide cylinder.

[0025] According to some preferred embodiments of the present invention, a nuclear air purification device is further included. A purification interface is provided on the side of the fourth accommodating portion of the first frame portion away from the second frame portion. The purification interface is connected to the nuclear air purification device through a pipeline. The nuclear air purification device is used to maintain a negative pressure in the first frame portion. When the guide member is well docked with the recovery barrel, the sealing performance at the cutting mechanism is good. At this time, the fourth accommodating portion is maintained at a negative pressure by connecting the nuclear air purification device at the purification interface. Due to the communication relationship between the fourth accommodating portion and the third accommodating portion, the second accommodating portion and the first accommodating portion, the entire first frame portion is ultimately maintained at a negative pressure, thereby preventing radioactive waste such as flying chips generated during cutting from flying out of the first frame portion and causing nuclear pollution to the external environment.

[0026] According to some preferred embodiments of the present invention, the support platform is provided with two lead brick stacking platforms, located on the front and rear sides of the second frame portion, respectively, for placing lead bricks. Providing these platforms for placing lead bricks provides radiation shielding, minimizing the risk of radiation exposure to personnel from the guide tube.

[0027] According to some preferred embodiments of the present invention, a cover plate and a support plate are provided at one end of the shielding cover close to the frame, and the guide tube passes through the cover plate and the support plate at one end close to the frame. The cover plate is located above the support plate, and the support plate is connected to the top of the first frame portion, and the support plate is used to support the shielding cover.

[0028] Due to the adoption of the above technical solution, compared with the prior art, the benefits of the present invention are as follows: a nuclear power plant control rod guide tube cutting device of the present invention can realize automatic cutting of the control rod guide tube, making the control rod guide tube cutting and preparation processing process more efficient and safer, and effectively preparing and disposing of the decommissioned and dismantled control rod guide tube; in addition, there is no need to change direction when transporting the guide tube from the storage bin to the cutting device or when entering the entire cutting device, which facilitates operation, reduces the number of times workers come into contact with the radioactive guide tube, can reduce the radiation dose of workers, and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Schematic diagram of the three-dimensional structure of the cutting device in a preferred embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure of the cutting device in a preferred embodiment of the present invention, excluding the recovery mechanism and the nuclear air purification device;

[0032] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure after some components are hidden;

[0033] Figure 4 for Figure 3 A schematic diagram of the three-dimensional structure after some components are hidden;

[0034] Figure 5 A schematic diagram of the three-dimensional structure of the cutting mechanism in the first perspective in a preferred embodiment of the present invention;

[0035] Figure 6 A schematic diagram of the three-dimensional structure of the cutting mechanism from a second viewing angle in a preferred embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the three-dimensional structure of the cutting device in a preferred embodiment of the present invention with some components hidden;

[0037] Figure 8 This is a schematic diagram of the three-dimensional structure of the cutting device in a preferred embodiment of the present invention with some components hidden;

[0038] Figure 9 This is a schematic diagram of the three-dimensional structure of the guide mechanism, the clamping mechanism and part of the cutting mechanism in the preferred embodiment of the present invention;

[0039] Figure 10 for Figure 9 A partial enlarged view of part A in the middle;

[0040] Figure 11 for Figure 9 Schematic diagram of the main structure;

[0041] Figure 12 This is a schematic diagram of the three-dimensional structure of the recovery mechanism in a preferred embodiment of the present invention;

[0042] Figure 13 This is a schematic top view of the recovery mechanism in a preferred embodiment of the present invention;

[0043] Among them, the figure markings are: frame-1, first frame part-11, second frame part-12, first accommodating part-121, second accommodating part-122, third accommodating part-123, fourth accommodating part-124, baffle-13, purification interface-14, nuclear air purification device-2, support platform-3, lead brick stacking platform-31, channel-32, foot-33, shielding cover-4, cover plate-41, support plate-42, first clamping hook-51, second clamping hook-52, third clamping hook-53, fourth clamping hook-54, first enclosure frame-55, first angle-551, second angle-552, third angle-553, fourth angle-554, second enclosure frame-56, guide member-57, feed port-571, first A clamping member -61, a second clamping member -62, a third clamping member -63, a fourth clamping member -64, a first driver -65, a second driver -66, a third driver -67, a fourth driver -68, a cutting mechanism -7, a saw blade -71, a saw blade protection cover -711, a cutting motor -72, a cutting motor protection cover -721, a gear box -73, a reducer output shaft -74, a fixed frame -75, a slide rail -76, a feed motor -77, an accordion cover -78, a recovery mechanism -8, a recovery barrel -81, a turntable -82, a limit block -821, a fixed plate -83, a bottom frame -84, a guide rail -85, a first motor -86, a second motor -87, a partition plate -88, a through hole -881, and a guide cylinder -9. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0045] Reference Figures 1 to 13This embodiment provides a device for cutting a control rod guide cylinder for a nuclear power plant, wherein the guide cylinder 9 to be cut includes a cylindrical upper guide cylinder and a square lower guide cylinder with an angular outer wall. The cutting device includes a guide mechanism, a clamping mechanism, a cutting mechanism 7, a recovery mechanism 8, a hydraulic control cabinet (not shown), a frame 1, a support platform 3, and a shielding cover 4. The guide mechanism, the clamping mechanism, and the cutting mechanism 7 are all located within the frame 1. The shielding cover 4 is disposed at the top of the frame 1. A passage for the guide cylinder 9 to enter is provided within the shielding cover 4. The support platform 3 is disposed at the bottom of the frame 1. The frame 1 is located on the support platform 3 and is fixedly connected to the support platform 3. The hydraulic control cabinet is located on the side of the support platform 3 close to the cutting mechanism 7.

[0046] Further, refer to Figures 1 to 4 and Figure 7 The frame 1 includes a first frame portion 11 and a second frame portion 12 connected to each other, with a baffle 13 provided between the first frame portion 11 and the second frame portion 12. Specifically, the first frame portion 11 includes a first accommodating portion 121, a second accommodating portion 122, a third accommodating portion 123, and a fourth accommodating portion 124. The first accommodating portion 121 is located at the upper end of the first frame portion 11, the second accommodating portion 122 is located on the left side below the first accommodating portion 121, the third accommodating portion 123 and the fourth accommodating portion 124 are located on the right side below the first accommodating portion 121, and the third accommodating portion 123 is located above the fourth accommodating portion 124. The guide mechanism is located in the first accommodating portion 121, and the clamping mechanism is located in the second accommodating portion 122. In addition, the first accommodating portion 121 is connected to the second accommodating portion 122, the second accommodating portion 122 is connected to the third accommodating portion 123, the third accommodating portion 123 is connected to the fourth accommodating portion 124, the bottoms of the second accommodating portion 122 and the third accommodating portion 123 are flush, and the bottoms of the second accommodating portion 122 and the third accommodating portion 123 both have openings. This arrangement is to ensure that the cut pieces of the guide cylinder 9 after cutting can fall downward into the recovery mechanism 8 without being blocked by the frame 1.

[0047] Specifically, a purification interface 14 is provided on a side of the fourth accommodating portion 124 away from the second frame portion 12 . The purification interface 14 is connected to the nuclear air purification device 2 through a pipeline and is used to maintain a negative pressure in the first frame portion 11 .

[0048] Further, refer to Figures 7 to 11 The guide mechanism is located below the shielding cover 4 and includes an upper guide portion and a lower guide portion arranged in parallel, and also includes a guide member 57 arranged below the clamping mechanism. Figures 9 to 11As shown, the upper guide portion is located above the lower guide portion, and the upper guide portion includes a first clamping hook 51 and a second clamping hook 52 that are symmetrically arranged, and the lower guide portion includes a third clamping hook 53 and a fourth clamping hook 54 that are symmetrically arranged. A first frame 55 is formed between the first clamping hook 51 and the second clamping hook 52, and a second frame 56 is formed between the third clamping hook 53 and the fourth clamping hook 54. The centers of the first frame 55 and the second frame 56 are all located in the same vertical direction as the center of the guide cylinder 9. In this embodiment, the first frame 55 includes a first angle 551 and a second angle 552 that are symmetrically arranged, and a third angle 553 and a fourth angle 554 that are symmetrically arranged; as shown in FIG. Figure 8 As shown, the cutting mechanism 7 is cutting the lower guide cylinder, wherein the first angle 551, the second angle 552, the third angle 553 and the fourth angle 554 of the guide mechanism correspond to the edges of the outer wall of the guide cylinder 9, so that when the guide cylinder 9 extends into the guide mechanism, the four edges on the outer wall of the lower guide cylinder can respectively match the first angle 551, the second angle 552, the third angle 553 and the fourth angle 554, and the guide cylinder 9 will not tilt or shake at will, thereby ensuring that the guide cylinder 9 always remains in a vertical state when entering downward from the shielding cover 4, avoiding the guide cylinder 9 from tilting, which is not conducive to cutting.

[0049] The top surface of the guide member 57 is connected to the bottom of the fourth accommodating portion 124, part of the guide member 57 is located in the second accommodating portion 122, and the remaining part of the guide member 57 is located in the third accommodating portion 123, and a feed port 571 is provided on the bottom surface of the guide member 57 for guiding the cut pieces of the guide cylinder 9 to fall into the designated area of the recovery mechanism 8.

[0050] Further, refer to Figures 7 to 11The clamping mechanism is located below the guide mechanism and includes an upper clamping portion and a lower clamping portion arranged in parallel. The upper clamping portion is located directly above the lower clamping portion. The upper clamping portion includes a first clamping member 61 and a second clamping member 62 arranged symmetrically, and the lower clamping portion includes a third clamping member 63 and a fourth clamping member 64 arranged symmetrically. The first clamping member 61 and the second clamping member 62 are located in the same horizontal direction, and the third clamping member 63 and the fourth clamping member 64 are located in the same horizontal direction. The clamping mechanism also includes a first driver 65 connected to the first clamping member 61, a second driver 66 connected to the second clamping member 62, a third driver 67 connected to the third clamping member 63, and a fourth driver 68 connected to the fourth clamping member 64. The first driver 65 and the second driver 66 are used to drive the upper clamping portion to a clamped state or an open state, and the third driver 67 and the fourth driver 68 are used to drive the lower clamping portion to a clamped state or an open state. The setting of the clamping mechanism facilitates the guide cylinder 9 to remain fixed during cutting; in this embodiment, the clamping mechanism is a hydraulic clamping mechanism, and the hydraulic control cabinet provides power for the hydraulic clamping mechanism. In addition, the movements of the upper clamping part and the lower clamping part are not completely synchronized. When the guide cylinder 9 is cutting, the upper clamping part and the lower clamping part both tightly clamp the part to be cut of the guide cylinder 9, and the cutting mechanism 7 cuts the part between the upper clamping part and the lower clamping part; when the cutting is completed, the lower clamping part is loosened and opened, allowing the cut part of the guide cylinder 9 to fall downward into the recovery mechanism 8, while the upper clamping mechanism is still in the clamping state, tightly clamping the guide cylinder 9 to prevent it from falling.

[0051] The cutting mechanism 7 cuts the guide cylinder 9 in the horizontal direction, and the cutting direction of the cutting mechanism 7 is perpendicular to the guide cylinder 9. Figures 3 to 8 The cutting mechanism 7 includes a saw blade 71, a cutting motor 72, a gear box 73, a reducer, a fixing frame 75, a slide rail 76 and a feed motor 77. Figure 9 and Figure 11As shown, the saw blade 71 is positioned between the upper and lower clamping portions. This embodiment utilizes a spark-free cutting saw blade 71 coated with a metal-ceramic coating, eliminating the need for lubricating oil, coolant, or the like during the cutting process. The saw blade 71 is connected to the reducer via a reducer output shaft 74, which is in turn connected to a gearbox 73. The output shaft of the cutting motor 72 is connected to the gearbox 73. Both the cutting motor 72 and the gearbox 73 are fixedly connected to a fixed frame 75, which is slidably connected to a slide rail 76. A feed motor 77 is connected to the fixed frame 75 via a screw. Specifically, the cutting motor 72 controls the rotation of the saw blade 71 to cut the guide cylinder 9. The feed motor 77 is used to drive the fixed frame 75 to move in a direction perpendicular to the guide cylinder 9, so as to facilitate adjustment of the distance between the saw blade 71 and the guide cylinder 9. When cutting is not required, the fixed frame 75 can be moved on the slide rail 76 to drive the saw blade 71 and other components away from the guide cylinder 9; when cutting is required, the saw blade 71 can be moved closer to the guide cylinder 9.

[0052] Specifically, a blade guard 711 is positioned outside the saw blade 71. The reducer output shaft 74 extends through the thickness of the blade guard 711. A notch is provided on the side of the blade guard 711 near the guide cylinder 9, exposing a portion of the saw blade 71 outside the blade guard 711. A motor guard 721 is positioned outside the cutting motor 72 to protect it from damage. The saw blade 71 and gearbox 73 of the cutting mechanism 7 are partially located within the second housing 122 of the first frame 11, while the remaining portion of the cutting mechanism 7 is located within the second frame 12. A retractable bellows 78 is positioned outside the cutting mechanism 7. The portion of the cutting mechanism 7 located within the second frame 12 is located within the bellows 78. The open end of the bellows 78 is connected to the baffle 13. When the bellows 78 is fully extended to completely enclose the portion of the cutting mechanism 7 located within the second frame 12, it can contain radioactive contamination from the cutting guide cylinder 9. In addition, a fan (not shown) is provided inside the accordion cover 78 for cooling the saw blade 71 and the guide cylinder 9 in real time during the cutting process to avoid excessive cutting temperature.

[0053] Further, refer to Figure 1 、 Figure 12 and Figure 13The recovery mechanism 8 includes a recovery bucket 81, a turntable 82, a fixed plate 83, a bottom frame 84, a guide rail 85, a first motor 86, and a second motor 87. The recovery bucket 81 is preferably a concrete bucket that meets the solid waste treatment standards of nuclear power plants. One end of the guide rail 85 is located below the guide member 57, and the other end is away from the support platform 3. The recovery bucket 81 is located on the turntable 82 and is fixedly connected to the turntable 82. The turntable 82 is rotatably connected to the fixed plate 83, which is fixedly connected to the bottom frame 84. The bottom frame 84 is slidably connected to the guide rail 85. A plurality of limit blocks 821 are provided on the top surface of the turntable 82, and the plurality of limit blocks 821 abut against the outer wall of the recycling bucket 81. The plurality of limit blocks 821 in this embodiment together form a circle with a diameter greater than the outer diameter of the recycling bucket 81. The plurality of limit blocks 821 are used to limit the recycling bucket 81 fixed on the turntable 82 to prevent the recycling bucket 81 from falling from the turntable 82 during movement, thereby ensuring that the position of the recycling bucket 81 on the turntable 82 is fixed. The first motor 86 is used to drive the bottom frame 84 to move along the length direction of the guide rail 85. The back and forth movement of the bottom frame 84 on the guide rail 85 drives the fixed plate 83, the turntable 82 and the recovery bucket 81 to move relative to the guide rail 85 as a whole, so that during the cutting process, the recovery bucket 81 can move to the bottom of the guide cylinder 9 to collect the cut pieces of the guide cylinder 9; when the cutting is completed, the recovery bucket 81 is moved outward from the bottom of the guide cylinder 9, and the cut pieces of the guide cylinder 9 are transported away in time. The whole operation process is simple and efficient; the second motor 87 is used to drive the turntable 82 to rotate.

[0054] Specifically, refer to Figure 12 and Figure 13A circular partition plate 88 parallel to the top surface of the recycling bin 81 is provided in the recycling bin 81. In this embodiment, the partition plate 88 is provided with five through holes 881 of the same size. The inner diameter of each through hole 881 is larger than the outer diameter of the guide cylinder 9 cut pieces. When the cut guide cylinder 9 cut pieces are collected, one through hole 881 corresponds to one guide cylinder 9 cut piece, and the guide cylinder 9 cut pieces fall into the recycling bin 81 from different through holes 881 on the partition plate 88. The distance from the partition plate 88 to the bottom surface of the recycling bin 81 is set to be less than the length of the guide cylinder 9 cut pieces, which can prevent the guide cylinder 9 cut pieces that fall into the recycling bin 81 from stacking together, resulting in a messy arrangement of the guide cylinder 9 cut pieces in the recycling bin 81, and effectively reduce the volume for storing the guide cylinder 9 cut pieces. The second motor 87 drives the turntable 82 to rotate and drives the recycling bin 81 to rotate, so as to adjust the position of the through hole 881 on the partition plate 88 in the recycling bin 81 below the guide cylinder 9, so that the cut pieces of the guide cylinder 9 can accurately fall into the recycling bin 81 from different through holes 881. In order to facilitate accurate adjustment of the angle of the turntable 82, a sensor (not shown) is provided on the side of the fixed plate 83 close to the turntable 82, and an iron block (not shown) is provided on the bottom of the turntable 82 close to the fixed plate 83. During the rotation process, when the iron block touches the sensor, the position of the turntable 82 at this time is positioned as the origin position, which corresponds to one of the through holes 881. Thereafter, the rotation angle of the turntable 82 can be directly controlled according to the positional relationship between the other through holes 881 and the through hole 881 corresponding to the origin position. If necessary, it is also necessary to control the second motor 87 to drive the bottom frame 84 to move, so that the turntable 82 and the recycling bin 81 move outward, so that the different through holes 881 on the partition plate 88 can be located directly below the guide cylinder 9 after adjustment.

[0055] Specifically, when the cutting mechanism 7 cuts the guide cylinder 9, the recovery bucket 81 is located below the guide member 57 of the guide mechanism and the feed port 571 of the guide member 57 is docked with the opening at the top of the recovery bucket 81, thereby preventing the radioactive cut parts of the guide cylinder 9 from falling to the outside and causing radioactive leakage that endangers the health of the workers, and can minimize the radioactive contamination generated during cutting. The feed port 571 of the guide member 57 is also provided with a diameter larger than the inner diameter of the recovery barrel 81 and smaller than the outer diameter of the recovery barrel 81. When the feed port 571 is properly connected to the opening of the recovery barrel 81, the position of the entire cutting mechanism 7 is well sealed. At this time, by connecting the nuclear air purification device 2 at the purification interface 14, the fourth accommodating portion 124 of the first frame portion 11 is kept at a negative pressure. Due to the communication relationship between the fourth accommodating portion 124 and the third accommodating portion 123, the second accommodating portion 122 and the first accommodating portion 121, the entire first frame portion 11 is ultimately kept at a negative pressure, thereby preventing radioactive waste such as flying chips generated during cutting from flying out of the first frame portion 11 and causing nuclear pollution to the external environment.

[0056] Further, refer to Figure 1 and Figure 2 Two lead brick stacking platforms 31 are provided on the support platform 3 near the cutting mechanism 7. The two lead brick stacking platforms 31 are located on the front and rear sides of the second frame portion 12 respectively. The lead brick stacking platforms 31 are used to place lead bricks, which are used for radiation shielding to minimize the harm caused by the radioactivity of the guide cylinder 9 to the workers. In addition, Figure 1 and Figure 2 As shown, the support platform 3 is provided with a channel 32 located directly below the guide cylinder 9. The channel 32 extends through the height direction of the support platform 3 and its length direction is parallel to the length direction of the support platform 3. The provision of the channel 32 facilitates the laying of the guide rail 85 of the recovery mechanism 8 and the placement of the recovery bucket 81. The bottom of the support platform 3 is also provided with a foot 33.

[0057] Furthermore, the guide cylinder 9 is parallel to the length direction of the shielding cover 4, the shielding cover 4 is connected to the frame 1, and the guide cylinder 9 enters the guide mechanism vertically downward from the top of the shielding cover 4 along the length direction of the shielding cover 4. The shielding cover 4 can play a role in shielding the radioactivity of the guide cylinder 9 and reducing the radiation dose. Figures 1 to 4 The end of the shielding cover 4 close to the frame 1 is provided with a cover plate 41 and a support plate 42. The end of the guide tube 9 close to the frame 1 passes through the cover plate 41 and the support plate 42. The cover plate 41 is located above the support plate 42, and the support plate 42 is connected to the top of the first frame portion 11. The cover plate 41 covers the support plate 42 to prevent the radioactive waste generated by the cutting from flying outward from the gap between the support plate 42 and the shielding cover 4; the support plate 42 is used to support the shielding cover 4. In this embodiment, when it is necessary to transport the guide tube 9 from the storage bin to the cutting device, the shielding cover 4 is taken out, the guide tube 9 is lifted out of the storage bin, and then it is transported to the cutting device. It is easy to use and operate, and can also shield the radioactivity generated by the guide tube 9 during transportation, thereby improving safety performance.

[0058] The working process of the cutting device for the control rod guide tube 9 of a nuclear power plant in this embodiment is as follows:

[0059] Take out the shielding cover 4 and use it to transfer the control rod guide cylinder 9 to the top of the support plate 42, place the shielding cover 4 on the support plate 42 and cover it with the cover plate 41, and the guide cylinder 9 enters the guide mechanism vertically downward along the length of the shielding cover 4. The first frame 55 of the upper guide part of the guide mechanism ensures that the guide cylinder 9 always remains vertical during the descent process, and the guide cylinder 9 continues to extend downward to open the upper clamping part and the lower clamping part of the clamping mechanism. When the guide cylinder 9 extends into the clamping mechanism, the first driver 65, the second driver 66, the third driver 67 and the fourth driver 68 are controlled so that the upper clamping part and the lower clamping part are in a clamping state, and the guide cylinder 9 is tightly clamped. The first motor 86 is started to drive the bottom frame 84 to move along the guide rail 85 toward the guide cylinder 9, thereby driving the recovery bin 81 toward the guide cylinder 9 until the recovery bin 81 is directly below the guide cylinder 9. The second motor 87 is started to rotate the turntable 82 to the origin position. At this time, the through hole 881 on the partition plate 88 corresponding to the origin position is observed to be directly below the guide cylinder 9. If not, the first motor 86 is used to drive the bottom frame 84 and the recovery bin 81 again until the through hole 881 on the partition plate 88 corresponding to the origin position is directly below the guide cylinder 9. The feed motor 77 is started to move the saw blade 71 of the cutting mechanism 7 toward the portion of the guide cylinder 9 to be cut. The cutting motor 72 is started to drive the saw blade 71 to rotate and cut the portion of the guide cylinder 9 to be cut until the portion is cut. The third and fourth drivers 67 and 68 are started to open the lower clamping portion, allowing the cut guide cylinder 9 to fall into the recovery bin 81. At this time, the cutting motor 72 is turned off, causing the saw blade 71 to stop working. Then, the guide cylinder 9 is further extended downward by the lifting equipment to cut the remaining part. The cutting operation of the remaining part of the guide cylinder 9 is similar to the above steps. Before each cutting, the position of the recovery bucket 81 needs to be adjusted so that a new through hole 881 is just located below the guide cylinder 9, and then cutting is carried out until all the through holes 881 of the partition plate 88 fall into the guide cylinder 9 cutting piece. The cutting work can be stopped, the recovery bucket 81 can be moved out and transported, and a new recovery bucket 81 is replaced to restart the cutting work until the guide cylinder 9 is completely cut.

[0060] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A control rod guide tube cutting device for a nuclear power plant, characterized in that: The guide tube comprises a guide mechanism, a clamping mechanism, a cutting mechanism and a recovery mechanism. The longitudinal direction of the guide tube is vertical. The guide mechanism is located above the clamping mechanism, and the recovery mechanism is located below the clamping mechanism. The guide mechanism is used to keep the guide tube vertical when clamped by the clamping mechanism. The clamping mechanism is used to clamp the guide tube. The recovery mechanism is used to collect the cut pieces of the guide tube that fall after cutting. The cutting direction of the cutting mechanism is perpendicular to the guide tube. The guide mechanism includes an upper guide part and a lower guide part arranged in parallel, the upper guide part includes a first clamping hook and a second clamping hook arranged symmetrically, and the lower guide part includes a third clamping hook and a fourth clamping hook arranged symmetrically; a first frame is formed between the first clamping hook and the second clamping hook, and a second frame is formed between the third clamping hook and the fourth clamping hook, the first frame and / or the second frame include a first angle and a second angle that are symmetrical to each other and a third angle and a fourth angle that are symmetrical to each other, at least one of the first frame and the second frame is set with a first angle, a second angle, a third angle and a fourth angle; the first angle, the second angle, the third angle and the fourth angle correspond to the edge settings of the outer wall of the guide tube.

2. The nuclear power plant control rod guide tube cutting device according to claim 1, characterized in that: It also includes a shielding cover, a frame and a support platform, wherein a channel for the guide cylinder to enter is provided in the shielding cover, the guide cylinder is parallel to the length direction of the shielding cover, and the guide cylinder vertically enters the channel and the guide mechanism downward from the top of the shielding cover; The guiding mechanism, the clamping mechanism, and the cutting mechanism are all located in the frame. The shielding cover is arranged on the top of the frame. The shielding cover is communicated with the frame. The frame is located on the support platform and is fixedly connected to the support platform.

3. The nuclear power plant control rod guide tube cutting device according to claim 2, characterized in that: The guide mechanism is located below the shielding cover, the upper guide portion is located above the lower guide portion, and the centers of the first surrounding frame, the second surrounding frame, and the guide cylinder are all located in the same vertical direction.

4. The nuclear power plant control rod guide tube cutting device according to claim 2, characterized in that: The clamping mechanism is located below the guide mechanism, and the clamping mechanism includes an upper clamping part and a lower clamping part arranged in parallel, and the upper clamping part and the lower clamping part both include a clamping state and an open state; the upper clamping part includes a first clamping member and a second clamping member arranged symmetrically, and the lower clamping part includes a third clamping member and a fourth clamping member arranged symmetrically, the first clamping member and the second clamping member are located in the same horizontal direction, and the third clamping member and the fourth clamping member are located in the same horizontal direction.

5. The nuclear power plant control rod guide tube cutting device according to claim 4, characterized in that: The clamping mechanism also includes a first driver connected to the first clamping member, a second driver connected to the second clamping member, a third driver connected to the third clamping member, and a fourth driver connected to the fourth clamping member; the first driver and the second driver are used to drive the upper clamping part to be in the clamping state or the open state, and the third driver and the fourth driver are used to drive the lower clamping part to be in the clamping state or the open state.

6. The nuclear power plant control rod guide tube cutting device according to claim 4, characterized in that: The cutting mechanism includes a saw blade, a cutting motor, a feed motor, a gear box, a reducer, a fixed frame and a slide rail, wherein the saw blade is located between the upper clamping portion and the lower clamping portion; the saw blade is connected to the reducer via a reducer output shaft, the gear box is connected to the reducer, and the output shaft of the cutting motor is connected to the gear box; the cutting motor and the gear box are both fixedly connected to the fixed frame, the fixed frame is slidably connected to the slide rail, and the moving direction of the fixed frame is perpendicular to the guide cylinder; The feed motor is connected to the fixed frame via a screw rod, and the feed motor is used to drive the fixed frame to move.

7. The nuclear power plant control rod guide tube cutting device according to claim 6, characterized in that: The cutting mechanism also includes a saw blade protective cover for accommodating the saw blade. The output shaft of the reducer passes through the thickness direction of the saw blade protective cover. A notch is provided on the side of the saw blade protective cover close to the guide cylinder. The notch is used to expose part of the saw blade outside the saw blade protective cover.

8. The nuclear power plant control rod guide tube cutting device according to claim 6, characterized in that: The frame includes a first frame portion and a second frame portion connected to each other, and the guiding mechanism and the clamping mechanism are located in the first frame portion; the saw blade and the gear box portion in the cutting mechanism are located in the first frame portion, and a baffle is provided between the first frame portion and the second frame portion; an accordion cover is provided on the outside of the cutting mechanism, and the portion of the cutting mechanism located in the second frame portion is all located in the accordion cover, and the open end of the accordion cover is connected to the baffle.

9. The nuclear power plant control rod guide tube cutting device according to claim 8, characterized in that: The first frame portion comprises a first accommodating portion, a second accommodating portion, a third accommodating portion and a fourth accommodating portion, wherein the first accommodating portion is located at the upper end portion of the first frame portion, the second accommodating portion is located on the left side below the first accommodating portion, the third accommodating portion and the fourth accommodating portion are located on the right side below the first accommodating portion, and the third accommodating portion is located above the fourth accommodating portion; the guide mechanism is located in the first accommodating portion, the clamping mechanism is located in the second accommodating portion, the first accommodating portion is communicated with the second accommodating portion, the second accommodating portion is communicated with the third accommodating portion, the third accommodating portion is communicated with the fourth accommodating portion, the bottoms of the second accommodating portion and the third accommodating portion are flush, and the bottoms of the second accommodating portion and the third accommodating portion both have openings.

10. The nuclear power plant control rod guide tube cutting device according to claim 9, characterized in that: The guide mechanism also includes a guide member arranged below the clamping mechanism, the top surface of the guide member is connected to the bottom of the fourth accommodating portion, the guide member is partially located in the second accommodating portion, and the remaining part of the guide member is located in the third accommodating portion. A feed port is provided on the bottom surface of the guide member.

11. The nuclear power plant control rod guide tube cutting device according to claim 10, characterized in that: The recovery mechanism includes a recovery bucket. When the cutting mechanism cuts the guide cylinder, the recovery bucket is located below the guide member and the feed port is docked with the top of the recovery bucket. The diameter of the feed port is larger than the inner diameter of the recovery bucket and smaller than the outer diameter of the recovery bucket.

12. The nuclear power plant control rod guide tube cutting device according to claim 11, characterized in that: A partition plate is provided in the recycling bin, and the partition plate is parallel to the top surface of the recycling bin. A plurality of through holes are provided on the partition plate, and the inner diameter of the through holes is larger than the outer diameter of the guide tube cutting piece. The distance from the partition plate to the bottom surface of the inside of the recycling bin is smaller than the length of the guide tube cutting piece.

13. The nuclear power plant control rod guide tube cutting device according to claim 12, characterized in that: The recycling mechanism also includes a turntable, a fixed plate, a bottom frame, a guide rail, a limit block, a first motor and a second motor. The recycling bin is located on the turntable, one end of the guide rail is located below the clamping mechanism, and the other end of the guide rail is away from the support platform; the turntable is rotatably connected to the fixed plate, the fixed plate is fixedly connected to the bottom frame, and the bottom frame is slidably connected to the guide rail; a plurality of limit blocks are provided on the top surface of the turntable, and the limit blocks abut against the outer wall of the recycling bin; the first motor is used to drive the bottom frame to move along the length direction of the guide rail, and the second motor is used to drive the turntable to rotate.

14. The nuclear power plant control rod guide tube cutting device according to claim 9, characterized in that: It also includes a nuclear air purification device. A purification interface is provided on the side of the fourth accommodating portion of the first frame portion away from the second frame portion. The purification interface is connected to the nuclear air purification device through a pipe. The nuclear air purification device is used to maintain negative pressure in the first frame portion.

15. The nuclear power plant control rod guide tube cutting device according to claim 9, characterized in that: Two lead brick stacking platforms are provided on the support platform. The two lead brick stacking platforms are respectively located at the front and rear sides of the second frame portion. The lead brick stacking platforms are used for placing lead bricks.

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