A nuclear fuel canister weld removal apparatus and method

Abstract

The present application belongs to the technical field of nuclear reactor engineering, and particularly relates to a nuclear fuel tank weld removal device and method, which comprises a rack, a machine head lifting device is installed on the rack; the machine head lifting device drives a machine head assembly to move up and down; a positioning rod is connected to one end of the machine head assembly away from the machine head lifting device, and the machine head assembly drives the positioning rod to rotate; a positioning ring is arranged at one end of the positioning rod away from the machine head assembly; the positioning ring is adapted to the center of the tank cover; the machine head lifting device drives the positioning rod and the machine head assembly to pass through the hole so that the positioning ring is in contact with the tank cover; the positioning ring is positioned by cooperating with the tank cover, and the tank opening is cut by rotating the cutting knife head around the positioning rod, so that the sealing weld of the nuclear fuel tank of the pebble bed high temperature gas cooled reactor nuclear power plant is removed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of nuclear reactor engineering, and particularly relates to a nuclear fuel tank weld removal device and method. BACKGROUND

[0002] The pebble bed high temperature gas cooled reactor nuclear power plant adopts spherical fuel elements, the diameter of the fuel element is 6 cm, and tens of thousands of fuel elements are stored in a tank, the tank opening has a diameter of about 13 cm, and the tank opening and the tank cover are sealed by welding to prevent radioactive substances from escaping during storage.

[0003] When refueling of the reactor core is required, a nuclear fuel tank sealing weld removal device is used to remove the sealing weld of the tank, so as to pull out the tank cover and take out the fuel elements in the tank. Due to the limited space of the nuclear power plant, the nuclear fuel tank sealing weld removal device needs to pass through the floor and a narrow hole downward to reach above the nuclear fuel tank located in the shielding cover, and the weld removal is completed at the tank opening part under the condition of being irradiated by the radiation from the tank.

[0004] A nuclear fuel tank sealing weld removal device is designed in the prior art, which can realize cutting of the spent fuel storage tank. However, the cutting execution part of these devices cannot pass through the narrow hole, and is not suitable for nuclear fuel tank sealing weld removal of the pebble bed high temperature gas cooled reactor nuclear power plant. SUMMARY

[0005] In view of the above problems, the present application provides a nuclear fuel tank sealing weld removal device, which comprises a rack, a machine head lifting device is installed on the rack; the machine head lifting device drives the machine head assembly to move up and down; one end of the machine head assembly away from the machine head lifting device is connected with a positioning rod, and the machine head assembly drives the positioning rod to rotate; one end of the positioning rod away from the machine head assembly is provided with a positioning ring; the positioning ring is matched with the center of the tank cover;

[0006] The machine head lifting device drives the positioning rod and the machine head assembly to pass through the hole so that the positioning ring contacts the tank cover;

[0007] The machine head assembly comprises a cutting tool bit; the positioning rod is located at the center axis position of the machine head assembly, the distance between the cutting tool bit and the positioning rod is equal to the radius of the tank cover; the machine head assembly drives the cutting tool bit to rotate simultaneously around the positioning rod, and the cutting tool bit cuts the weld between the tank cover and the tank opening.

[0008] Further, a position adjusting mechanism is installed between the machine head lifting device and the machine head assembly, the machine head lifting device drives the machine head assembly and the position adjusting mechanism to move up and down, and the position adjusting mechanism drives the machine head assembly to move in the horizontal direction; the machine head assembly further comprises a rotary motor, a thrust cylinder and a cutting motor connected in sequence; the fixed end of the rotary motor is connected with the position adjusting mechanism, and the output end of the rotary motor is connected with the thrust cylinder; the cutting motor is installed inside the mounting shell, and the output end of the thrust cylinder is connected with the upper end of the mounting shell; the cutting tool head is connected with the output end of the cutting motor; one end of the positioning rod is connected with the thrust cylinder shell; a speed reducer is installed between the cutting motor and the cutting tool head.

[0009] Further, the machine head lifting device comprises a driving mechanism and a chain wheel; two groups of chain wheels are rotatably installed on the two opposite inner walls of the rack, and a transmission mechanism is installed between the two groups of chain wheels; the driving mechanism is installed on the rack, and drives the transmission mechanism to rotate; the two output ends of the transmission mechanism are respectively connected with one chain wheel in the two groups of chain wheels; each group of chain wheels is meshed with an annular chain; the annular chain is connected with the position adjusting mechanism; two groups of slide rail pairs are installed on the rack, and the two end faces of the position adjusting mechanism are respectively connected with the two groups of slide rail pairs in sliding mode.

[0010] Further, the position adjusting mechanism comprises an outer shell; the two side faces of the outer shell are respectively fixedly connected with two groups of annular chains and slidably connected with two groups of slide rail pairs; a horizontal adjusting mechanism is arranged on the outer shell; the fixed end of the rotary motor is installed on the horizontal adjusting mechanism, and the horizontal adjusting mechanism drives the rotary motor to move in the horizontal direction.

[0011] Further, a spring assembly is installed between the horizontal adjusting mechanism and the rotary motor; the spring assembly comprises a first disc and a second disc; the first disc is connected with the horizontal adjusting mechanism; the second disc is connected with the rotary motor, and a plurality of spring bodies are uniformly arranged between the first disc and the second disc.

[0012] Further, the mounting end of the rotary motor is fixedly installed at the lower end of the second disc, and the output end of the rotary motor is connected with a slewing bearing inner part; the slewing bearing inner part is rotatably connected with a slewing bearing outer part; the slewing bearing outer part is connected with a first outer cylinder between the second disc, and the inner wall of the first outer cylinder is fixed with the rotary motor shell.

[0013] Further, a bearing is sleeved inside the positioning ring, the positioning ring is rotatably connected with the positioning rod through the bearing, and the positioning ring and the tank cover remain relatively stationary.

[0014] Further, the driving mechanism is a manual operation mechanism and a lifting motor, and the manual operation mechanism and the lifting motor are connected with the transmission mechanism.

[0015] An inner slide rail is installed on the inner wall of the outer shell; an inner tray is slidably connected to the inner slide rail; the horizontal adjustment mechanism is installed on the inner tray; a drive assembly is installed on the outer shell; the drive assembly includes a drive motor and a transmission assembly; a screw is rotatably connected between the upper and lower ends of the inner wall of the outer shell, and the drive motor drives the screw to rotate through the transmission assembly; a ball nut is slidably connected to the screw, and the ball nut is fixedly connected to the inner tray.

[0016] Furthermore, it also includes a chip cleaning device, which is installed on the head assembly; the chip cleaning device includes an air supply nozzle and an exhaust nozzle, and one end of the air supply nozzle, the exhaust nozzle and the camera are fixed to the cutting motor housing; one end of the air supply nozzle and the exhaust nozzle is connected to the air pump, and the other end of the air supply nozzle, the exhaust nozzle and the camera are limited by the No. 3 disk; the No. 2 outer cylinder is connected between the No. 3 disk and the rotary bearing inner part.

[0017] The present invention provides a method for removing weld seams from a nuclear fuel tank, using any of the above-mentioned devices for removing weld seams from a nuclear fuel tank, and specifically comprising the following steps:

[0018] Use the tank moving device to move the tank to the tank mouth cutting position;

[0019] Start the machine head lifting device, which drives the machine head assembly and the positioning rod to move downward. The machine head and the positioning rod pass through the floor and the hole and descend to the tank cover;

[0020] Start the horizontal adjustment mechanism, which drives the head assembly and the positioning rod to move horizontally, so that the center of the positioning rod is aligned with the center of the tank cover;

[0021] The positioning rod is pressed down to the center of the tank cover, and the positioning rod serves as the rotation axis for the circumferential feed of the cutting head;

[0022] Start the thrust electric cylinder to drive the cutting head to move slowly downward to achieve axial feeding;

[0023] The rotating motor and the cutting motor are started, the cutting motor drives the cutting head to rotate, and the rotating motor drives the cutting head to move circumferentially along the annular weld.

[0024] The beneficial effects of the present invention compared to the prior art are as follows:

[0025] (1) The present invention drives the head assembly and the positioning rod to descend through the floor and the hole through the head lifting device, and cooperates with the tank cover to position it through the positioning ring. The cutting head rotates around the positioning rod to cut the tank mouth, thereby realizing the removal of the sealing welding seam of the nuclear fuel tank of the pebble bed type high temperature gas-cooled reactor nuclear power plant.

[0026] (ii) The application limits the position of the air supply nozzle, the air exhaust nozzle and the camera by the third disc, when the air supply nozzle, the air exhaust nozzle and the camera rotate under the drive of the rotary motor, the third disc and the second outer cylinder body rotate together, improving the stability of the relative position of the air supply nozzle, the air exhaust nozzle and the camera during rotation and the cutting knife head.

[0027] (iii) The air supply nozzle, the air exhaust nozzle and the camera move a small distance downward together with the cutting motor under the drive of the thrust cylinder, which can align the cutting position, and the air supply and exhaust orientation is more accurate, and the camera observation is more accurate.

[0028] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0030] Figure 1 The three-dimensional structure schematic diagram in the embodiment of the present application is shown.

[0031] Figure 2 The structure schematic diagram of the position close to the tank opening in the embodiment of the present application is shown.

[0032] Figure 3 The structure schematic diagram of the position of the machine head assembly in the embodiment of the present application is shown.

[0033] Figure 4 The structure schematic diagram of the position of the driving assembly in the embodiment of the present application is shown.

[0034] In the figure, 1 is a tank cover, 2 is a tank opening, 3 is a weld, 4 is an inner slide rail, 5 is an inner tray, 10 is a machine frame, 20 is a machine head lifting device, 201 is a driving mechanism, 2011 is a manual operation mechanism, 2012 is a lifting motor, 202 is a sprocket, 203 is a transmission mechanism, 204 is an endless chain, and 205 is a slide rail pair.

[0035] 30 is a position adjusting mechanism, 301 is an outer shell, 302 is a horizontal adjusting mechanism, 303 is a spring assembly, 3031 is a first disc, 3032 is a second disc, and 3033 is a spring main body.

[0036] 40, head assembly; 401, rotary motor; 402, thrust cylinder; 403, cutting motor; 404, cutting bit; 405, mounting housing; 406, rotary bearing inner member; 407, rotary bearing outer member; 408, speed reducer;

[0037] 50, positioning rod; 60, positioning ring; 70, chip removal device; 701, air supply nozzle; 702, air exhaust nozzle; 703, No. 3 disc; 80, camera;

[0038] 901, driving motor; 902, transmission assembly; 903, screw rod; 904, ball nut. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely explain the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0040] The current nuclear fuel storage tank port is sealed by welding, the weld is annular, and the diameter is about 13 cm. If the storage tank is to be reopened, the seal weld of the tank port of the storage tank needs to be cut to pull out the tank cover and take out the fuel elements in the tank.

[0041] The present application provides a nuclear fuel storage tank weld removal device, referring to Figure 1 , comprising a rack 10, a head lifting device 20 is installed on the rack 10; the head lifting device 20 drives the head assembly 40 to move up and down; the head assembly 40 is connected with a positioning rod 50 at one end away from the head lifting device 20, and the head assembly 40 drives the positioning rod 50 to rotate; the positioning rod 50 is provided with a positioning ring 60 at one end away from the head assembly 40; the positioning ring 60 is adapted to the center of the tank cover 1;

[0042] The head lifting device 20 drives the positioning rod 50 and the head assembly 40 to pass through the hole to make the positioning ring 60 contact with the tank cover 1;

[0043] Referring to Figure 2 , the head assembly 40 comprises a cutting bit 404; the positioning rod 50 is located at the central axis position of the head assembly 40, and the distance between the cutting bit 404 and the positioning rod 50 is equal to the radius of the tank cover 1; the head assembly 40 drives the cutting bit 404 to rotate simultaneously around the positioning rod 50, and the cutting bit 404 cuts the weld 3 between the tank cover 1 and the tank port 2.

[0044] Referring to Figure 3The position adjusting mechanism 30 is installed between the machine head lifting device 20 and the machine head assembly 40, the machine head lifting device 20 drives the machine head assembly 40 and the position adjusting mechanism 30 to move up and down, and the position adjusting mechanism 30 drives the machine head assembly 40 to move in the horizontal direction; the machine head assembly 40 further comprises a rotary motor 401, a thrust cylinder 402 and a cutting motor 403 connected in sequence; the fixed end of the rotary motor 401 is connected with the position adjusting mechanism 30, and the output end of the rotary motor 401 is connected with the thrust cylinder 402; the cutting motor 403 is installed inside the mounting shell 405, and the output end of the thrust cylinder 402 is connected with the upper end of the mounting shell 405; the cutting tool head 404 is connected with the output end of the cutting motor 403; one end of the positioning rod 50 is connected with the outer shell of the thrust cylinder 402; a speed reducer 408 is installed between the cutting motor 403 and the cutting tool head 404.

[0045] With reference to Figure 1 The machine head lifting device 20 comprises a driving mechanism 201 and a sprocket 202; two groups of the sprockets 202 are rotatably installed on two opposite inner walls of the rack 10, and a transmission mechanism 203 is installed between the two groups of sprockets 202; the driving mechanism 201 is installed on the rack 10, and the driving mechanism 201 drives the transmission mechanism 203 to rotate; two output ends of the transmission mechanism 203 are respectively connected with one sprocket 202 in each group of sprockets 202; each group of sprockets 202 is meshed with an endless chain 204; the endless chain 204 is connected with the position adjusting mechanism 30; two groups of slide rail pairs 205 are installed on the rack 10, and two end faces of the position adjusting mechanism 30 are respectively connected with the two groups of slide rail pairs 205 in sliding mode.

[0046] The driving mechanism 201 is a manual operation mechanism 2011 and a lifting motor 2012, and the manual operation mechanism 2011 and the lifting motor 2012 are connected with the transmission mechanism 203;

[0047] With reference to Figure 4 An inner slide rail 4 is installed on the inner wall of the outer shell 301; an inner tray 5 is connected with the inner slide rail in sliding mode; the horizontal adjusting mechanism 302 is installed on the inner tray 5; a driving assembly is installed on the outer shell 301; the driving assembly comprises a driving motor 901 and a transmission assembly 902; a lead screw 903 is rotatably connected between the upper end and the lower end of the inner wall of the outer shell 301, the driving motor 901 drives the lead screw 903 to rotate through the transmission assembly 902; a ball nut 904 is connected with the lead screw 903 in sliding mode, and the ball nut 904 is fixedly connected with the inner tray 5.

[0048] The position adjusting mechanism 30 comprises an outer housing 301; two sides of the outer housing 301 are fixedly connected with two groups of annular chains 204 and slidably connected with two groups of slide rail pairs 205; a horizontal adjusting mechanism 302 is arranged on the outer housing 301; a fixed end of the rotary motor 401 is mounted on the horizontal adjusting mechanism 302, and the horizontal adjusting mechanism 302 drives the rotary motor 401 to move in the horizontal direction.

[0049] The positioning ring 60 is internally sleeved with a bearing, and the positioning ring 60 is rotationally connected with the positioning rod 50 through the bearing, and the positioning ring 60 keeps relative stillness with the tank cover 1.

[0050] In the implementation process, first, the tank moving device is started to move the tank to the tank opening cutting position, at which time the tank opening is in a sealed and welded state; then the head lifting device 20 is started, the lifting motor 2012 drives the two sprockets 202 to rotate through the transmission mechanism 203, and the two sprockets 202 drive the annular chains 204 to rotate on the two sprockets 202; the annular chains 204 drive the outer housing 301 to move downward, and the outer housing 301 simultaneously moves downward along the slide rail pairs 205; the outer housing 301 drives the positioning rod 50 to move downward, and the head assembly 40 and the positioning rod 50 pass through the floor and the hole and are lowered to the tank cover 1, the tank cover 1 is provided with a hole slot matched with the positioning ring 60, the positioning ring 60 is inserted into the hole slot on the tank cover 1, the positioning ring 60 reliably contacts the tank cover 1, the positioning ring 60 is located at the center position of the head assembly 40, and the head lifting device 20 is stopped; wherein the outer housing 301 and the head lifting device 20 are detachably connected, if the head assembly 40 fails, the head lifting device 20 can be lifted by the manual operation mechanism 2011, and the head lifting device 20 is separated from the head assembly 40, so that the head assembly 40 is independently maintained.

[0051] After the head assembly 40 is roughly driven and positioned by the sprocket 202 and the annular chain 204, the driving motor 901 drives the lead screw 903 to rotate through the transmission assembly 902, the lead screw 903 drives the ball nut 904 to move up and down, thereby driving the inner tray 5 to accurately move up and down along the four inner slide rails 4; and precise driving and positioning are realized, and the self-locking effect is achieved, so that the head assembly 40 is prevented from falling.

[0052] If the position of the tank moving device is greatly deviated from the tank opening cutting position, the head assembly 40 is moved in the X and Y directions by the horizontal adjusting mechanism 302, and the horizontal displacement is further compensated, so that the center of the head assembly 40 is centered with the center of the tank cover 1; the horizontal adjusting mechanism 302 drives the positioning rod 50 to move horizontally on the linear slide rail by a linear motor or a manual adjusting mode, so as to compensate the horizontal displacement, and there is a set of linear motor and linear slide rail in the X and Y directions;

[0053] Afterwards, the cutting motor 403 is started, the cutting motor 403 drives the cutting head 404 to rotate, the cutting head 404 is located at the position of the weld 3 between the canister cover 1 and the canister, and the rotating motor 401 is started at the same time, the positioning ring 60 is located at the center position of the rotating motor 401, the rotating motor 401 rotates around the positioning rod 50 as the center axis, the positioning ring 60 keeps relatively static with the canister cover 1 through friction, the inner ring of the bearing in the positioning ring 60 is connected with the positioning rod 50 and rotates under the drive of the rotating motor 401; the cutting head 404 rotates around the positioning rod 50, the rotating motor 401 provides power for the cutting head 404 to feed axially along the annular weld 3; the rotating motor 401 drives the cutting head 404 to rotate to cut the annular weld 3; the thrust cylinder 402 drives the cutting motor 403 and the cutting head 404 to move a small distance downward to realize axial feeding and expand the cutting depth of the weld 3;

[0054] After the cutting of the weld 3 is completed, the rotating motor 401, the cutting motor 403 and the thrust cylinder 402 are stopped, the head lifting device 20 is started, the lifting motor 2012 drives the head assembly 40 and the positioning rod 50 to move upward, the positioning ring 60 is separated from the hole slot in the center of the canister cover 1, the head assembly 40 is lifted to the upper limit position of the stop, and the movement of the canister is not affected;

[0055] The above steps complete the removal of the sealing weld 3 of the canister port 2; the above steps can be repeated to remove the sealing weld 3 of multiple canister ports 2;

[0056] The transmission mechanism 203 also has a self-locking effect, so that the head lifting device 20 can be self-locked through the transmission mechanism 203 to prevent the head assembly 40 from falling accidentally; when the head lifting assembly fails to be automatically lifted, the manual operation mechanism 2011 is used in a long distance range for personnel to operate the drive transmission mechanism 203 to drive the sprocket 202 to rotate, so as to drive the head assembly 40 and the positioning rod 50 to move upward and separate from the canister, which is convenient for moving away the canister and then maintaining the head lifting device 20.

[0057] The head lifting device 20 drives the head assembly 40 and the positioning rod 50 to descend through the floor and the hole, and is positioned through the cooperation of the positioning ring 60 and the canister cover 1, the cutting head 404 rotates around the positioning rod 50 to cut the canister port 2, and the sealing weld 3 of the nuclear fuel canister of the pebble bed type high temperature gas cooled reactor nuclear power plant is removed.

[0058] The structure of the application is compact, the head assembly 40 can pass through a long and narrow hole with a diameter of not more than 25 cm and a depth of not more than 2 m, can withstand local irradiation of 20Gy / h of the canister port 2, realize automatic cutting and removal of the sealing weld 3, and clean the cutting chips;

[0059] In an embodiment of the present application, referring to Figure 3 The spring assembly 303 is installed between the horizontal adjustment mechanism 302 and the rotary motor 401; the spring assembly 303 comprises a first disc 3031 and a second disc 3032; the first disc 3031 is connected with the horizontal adjustment mechanism 302; the second disc 3032 is connected with the rotary motor 401; and a plurality of spring bodies 3033 are uniformly arranged between the first disc 3031 and the second disc 3032.

[0060] The spring body 3033 is arranged to make the positioning rod 50 have a vertical buffering function, so as to adapt to the size error in the vertical direction caused by various factors and ensure the cutting position accuracy of the tank mouth 2.

[0061] In an embodiment of the present application, the mounting end of the rotary motor 401 is fixedly installed at the lower end of the second disc 3032, and the output end of the rotary motor 401 is connected with a rotary bearing inner part 406; the rotary bearing inner part 406 is rotatably connected with a rotary bearing outer part 407; the rotary bearing outer part 407 is connected with the second disc 3032 through a first outer cylinder body, and the inner wall of the first outer cylinder body is fixed with the shell of the rotary motor 401.

[0062] In an embodiment of the present application, the debris removal device 70 is further included, and the debris removal device 70 is installed on the head assembly 40; the debris removal device 70 comprises a gas feeding nozzle 701 and a gas exhaust nozzle 702, and the gas feeding nozzle 701 and the gas exhaust nozzle 702 are fixed with the shell of the cutting motor 403; one end of the gas feeding nozzle 701 is communicated with a gas pump, one end of the gas exhaust nozzle 702 is communicated with the atmosphere, and the other ends of the gas feeding nozzle 701 and the gas exhaust nozzle 702 are limited by a third disc 703; a camera 80 is installed at the lower end of the third disc 703; and the third disc 703 is connected with the rotary bearing inner part 406 through a second outer cylinder body.

[0063] In the implementation process, while the rotary motor 401 drives the thrust cylinder 402 to rotate, the first outer cylinder and the rotary bearing outer part 407 do not rotate with the rotary motor 401, the rotary motor 401 drives the rotary bearing inner part 406 to rotate, the rotary bearing inner part 406 drives the second outer cylinder (not shown in the figure) and the third disc 703 to rotate synchronously, the third disc 703 is provided with holes for limiting the gas supply nozzle 701, the gas exhaust nozzle 702 and the camera 80, and the third disc 703 rotates with the rotary motor 401, the rotary motor 401 drives the cutting knife head 404 to rotate, and the third disc 703 drives the gas supply nozzle 701 (the nozzle part is flat and thin in the figure, which can more concentratedly blow gas to the cutting part), the gas exhaust nozzle 702 (the nozzle part is round and thick in the figure, which can better discharge the debris) and the camera 80 to rotate synchronously; the gas supply nozzle 701 and the gas exhaust nozzle 702 collect and process the debris after cutting the area of the tank opening 2, and the camera 80 checks the cutting weld 3 in the rotating process, and the camera 80 is connected with the data acquisition and storage system and the monitoring and control system to store the collected data and adjust and control according to the monitoring data in the cutting process.

[0064] In the process of driving the cutting knife head 404 to move downward by a small distance by the thrust cylinder, the gas supply nozzle 701 and the camera 80 move downward by a small distance with the cutting motor 403, which can more accurately observe the cutting part, and the gas supply nozzle 701 can more accurately supply gas, and the camera 80 can more accurately observe.

[0065] The air pump is installed around the weld 3 removing device, the gas of the air pump is filtered by the high-efficiency filter and then enters the gas supply nozzle 701 to blow out, forming a clean debris gas flow at the position of the weld 3, and the air pump drives the gas exhaust nozzle 702 to carry the smoke and debris in the cutting area, which is then discharged from the gas exhaust nozzle 702 and then discharged through the high-efficiency filter.

[0066] The application also provides a nuclear fuel tank weld removing method, which applies the nuclear fuel tank seal weld 3 removing device described above, and specifically includes the following steps.

[0067] The tank is moved to the tank opening cutting position by the tank moving device.

[0068] The head lifting device 20 is started, the head lifting device 20 drives the head assembly 40 and the positioning rod 50 to move downward, the head and the positioning rod 50 pass through the floor and the hole and descend to the tank cover 1.

[0069] The horizontal adjustment mechanism 302 is started, the horizontal adjustment mechanism 302 drives the head assembly 40 and the positioning rod 50 to move in the horizontal direction, so that the center of the positioning rod 50 is centered with the center of the tank cover 1.

[0070] The positioning rod 50 is pressed down to the center of the tank cover 1, and the positioning rod 50 serves as the rotation axis for the circumferential feeding of the cutting head 404;

[0071] Start the thrust cylinder 402 to drive the cutting head 404 to move slowly downward to achieve axial feeding;

[0072] The rotating motor 401 and the cutting motor 403 are started, the cutting motor 403 drives the cutting head 404 to rotate, and the rotating motor 401 drives the cutting head 404 to move circumferentially along the annular weld 3 .

[0073] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nuclear fuel tank weld removal device, characterized in that: The machine frame (10) includes a machine head lifting device (20) mounted on the machine frame (10); the machine head lifting device (20) drives the machine head assembly (40) to move up and down; the end of the machine head assembly (40) away from the machine head lifting device (20) is connected to a positioning rod (50), and the machine head assembly (40) drives the positioning rod (50) to rotate; a positioning ring (60) is provided on the end of the positioning rod (50) away from the machine head assembly (40); the positioning ring (60) is adapted to the center of the storage tank cover (1); The head lifting device (20) descends to drive the positioning rod (50) and the head assembly (40) through the hole so that the positioning ring (60) contacts the tank cover (1); The machine head assembly (40) includes a cutting head (404); the positioning rod (50) is located at the central axis of the machine head assembly (40); the distance between the cutting head (404) and the positioning rod (50) is equal to the radius of the tank cover (1); the machine head assembly (40) drives the cutting head (404) to rotate around the positioning rod (50) and the cutting head (404) to cut the weld (3) between the tank cover (1) and the tank opening (2); A position adjustment mechanism (30) is installed between the head lifting device (20) and the head assembly (40). The head lifting device (20) drives the head assembly (40) and the position adjustment mechanism (30) move up and down, and the position adjustment mechanism (30) drives the head assembly (40) to move in the horizontal direction; the head assembly (40) also includes a rotating motor (401), a thrust electric cylinder (402) and a cutting motor (403) connected in sequence; the fixed end of the rotating motor (401) is connected to the position adjustment mechanism (30), and the output end of the rotating motor (401) is connected to the thrust electric cylinder (402); the cutting motor (403) is installed inside the installation shell (405), and the output end of the thrust electric cylinder (402) is connected to the upper end of the installation shell (405); the cutting head (404) is connected to the output end of the cutting motor (403); one end of the positioning rod (50) is connected to the outer shell of the thrust electric cylinder (402); a reducer (408) is installed between the cutting motor (403) and the cutting head (404).

2. A nuclear fuel tank weld removal device according to claim 1, characterized in that: The machine head lifting device (20) includes a driving mechanism (201) and a sprocket (202); two groups of the sprockets (202) are rotatably mounted on two opposite inner walls of the frame (10), and a transmission mechanism (203) is installed between the two groups of sprockets (202); the driving mechanism (201) is mounted on the frame (10), and the driving mechanism (201) drives the transmission mechanism (203) to rotate; two output ends of the transmission mechanism (203) are respectively connected to one sprocket (202) in the two groups of sprockets (202); an annular chain (204) is engaged with each group of the sprockets (202); the annular chain (204) is connected to the position adjustment mechanism (30); two groups of slide rail pairs (205) are installed on the frame (10), and the two end surfaces of the position adjustment mechanism (30) are respectively slidably connected to the two groups of slide rail pairs (205).

3. A nuclear fuel tank weld removal device according to claim 2, characterized in that: The position adjustment mechanism (30) includes an outer shell (301); two side surfaces of the outer shell (301) are fixedly connected to two sets of ring chains (204) and slidably connected to two sets of slide rail pairs (205); a horizontal adjustment mechanism (302) is provided on the outer shell (301); a fixed end of the rotating motor (401) is installed on the horizontal adjustment mechanism (302), and the horizontal adjustment mechanism (302) drives the rotating motor (401) to move in a horizontal direction.

4. A nuclear fuel tank weld removal device according to claim 3, characterized in that: A spring assembly (303) is installed between the horizontal adjustment mechanism (302) and the rotating motor (401); the spring assembly (303) includes a first disk (3031) and a second disk (3032); the first disk (3031) is connected to the horizontal adjustment mechanism (302); the second disk (3032) is connected to the rotating motor (401), and multiple groups of spring bodies (3033) are evenly arranged between the first disk (3031) and the second disk (3032).

5. A nuclear fuel tank weld removal device according to claim 4, characterized in that: The rotating electric machine The mounting end of (401) is fixedly mounted on the lower end of the second disk (3032), and the output end of the rotary motor (401) is connected to the rotary bearing inner part (406); the outer ring of the rotary bearing inner part (406) is rotatably connected to the rotary bearing outer part (407); a first outer cylinder is connected between the rotary bearing outer part (407) and the second disk (3032), and the inner wall of the first outer cylinder is fixed to the outer shell of the rotary motor (401).

6. A nuclear fuel tank weld removal device according to claim 3, characterized in that: A bearing is sleeved inside the positioning ring (60), and the positioning ring (60) is rotatably connected to the positioning rod (50) via the bearing. The positioning ring (60) and the storage tank cover (1) remain relatively stationary.

7. A nuclear fuel tank weld removal device according to claim 6, characterized in that: The driving mechanism (201) is a manual operating mechanism (2011) and a lifting motor (2012), and the manual operating mechanism (2011) and the lifting motor (2012) are connected to the transmission mechanism (203); An inner slide rail (4) is installed on the inner wall of the outer shell (301); an inner tray (5) is slidably connected to the inner slide rail; the horizontal adjustment mechanism (302) is installed on the inner tray (5); a drive assembly is installed on the outer shell (301); the drive assembly includes a drive motor (901) and a transmission assembly (902); a lead screw (903) is rotatably connected between the upper and lower ends of the inner wall of the outer shell (301), and the drive motor (901) drives the lead screw (903) to rotate through the transmission assembly (902); a ball nut (904) is slidably connected to the lead screw (903), and the ball nut (904) is fixedly connected to the inner tray (5).

8. A nuclear fuel tank weld removal device according to claim 7, characterized in that: The machine head assembly (40) further comprises a chip cleaning device (70), which is mounted on the machine head assembly (40); the chip cleaning device (70) comprises an air supply nozzle (701) and an exhaust nozzle (702), one end of the air supply nozzle (701), the exhaust nozzle (702) and the camera (80) are fixed to the outer shell of the cutting motor (403); one end of the air supply nozzle (701) and the exhaust nozzle (702) is connected to the air pump, and the other end of the air supply nozzle (701), the exhaust nozzle (702) and the camera (80) is limited by the third disk (703); a second outer cylinder is connected between the third disk (703) and the rotary bearing inner component (406).

9. A method for removing weld seams from a nuclear fuel tank, using a nuclear fuel tank weld seam removal device according to any one of claims 3 to 8, characterized in that: The specific steps include: Use the tank moving device to move the tank to the tank mouth cutting position; The machine head lifting device (20) is started, and the machine head lifting device (20) drives the machine head assembly (40) and the positioning rod (50) to move downward, and the machine head assembly (40) and the positioning rod (50) pass through the floor and the hole and descend to the storage tank cover (1); The horizontal adjustment mechanism (302) is activated, and the horizontal adjustment mechanism (302) drives the head assembly (40) and the positioning rod (50) to move in the horizontal direction, so that the center of the positioning rod (50) is aligned with the center of the tank cover (1); The positioning rod (50) is pressed down to the center of the tank cover (1), and the positioning rod (50) serves as a rotation axis for the circumferential feeding of the cutting head (404); The thrust electric cylinder (402) is activated to drive the cutting head (404) to move slowly downward to achieve axial feeding; The rotating motor (401) and the cutting motor (403) are started, the cutting motor (403) drives the cutting head (404) to rotate, and the rotating motor (401) drives the cutting head (404) to move circumferentially along the annular weld (3).

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