A radioactive metal channel underwater stripping device

Abstract

The present invention relates to an underwater stripping device for radioactive metal channels, belonging to the field of nuclear, biological and chemical safety protection technology. The device comprises an underwater stripping device body, a control cabinet, a compressed air system and a special water tank. The special water tank is sealed on four sides and the bottom, and is open at the top. When in use, it is placed in a spent fuel storage pool. The underwater stripping device body comprises a rotating lifting assembly and a cutting unit. The rotating lifting assembly is arranged on the top of the special water tank. The rotating lifting assembly comprises a fixed operating frame, a rotating unit and a clamping lifting unit. The fixed operating frame provides support for the rotating unit and the clamping lifting unit. The rotating unit is used to control the rotation of the process pipe. The lower end of the clamping lifting unit is connected to the cutting unit. The cutting unit is arranged inside the special water tank. The lifting and lowering of the cutting unit is controlled by the clamping lifting unit, so as to realize cutting of process pipes of different lengths. The device provided by the present invention can solve the problem of spent fuel leakage in the underwater thermal cutting process.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear, biological and chemical safety protection, and specifically relates to an underwater stripping device for radioactive metal channels, which is suitable for underwater stripping of medium and high-level radioactive metal channels. Background Art

[0002] During the retrieval of spent fuel assemblies in the process tubes of the research reactor, the spent fuel assemblies may become stuck. In order not to damage the spent fuel assemblies, the spent fuel assemblies must be retrieved by cutting and stripping the process tubes. However, due to the high dose on the surface of the spent fuel process tubes, personnel are unable to cut and strip them on site.

[0003] The shielding effect of water can reduce the radiation dose of operators. Therefore, there are many underwater cutting and retrieval methods, mainly thermal cutting methods such as high-temperature arc plasma cutting, high-temperature flame cutting, and high-temperature laser cutting. Due to the high radioactivity level of spent fuel in the process tube, there may be spent fuel leakage during the thermal cutting process, which will cause radioactive hazards to operators. In order to deal with the situation of spent fuel jamming, underwater stripping can be used to retrieve the spent fuel in the process tube to achieve successful retrieval of spent fuel. Summary of the invention

[0004] In order to solve the defects of the prior art, the purpose of the present invention is to provide a radioactive metal channel underwater stripping device, which can solve the problem of spent fuel leakage during underwater thermal cutting.

[0005] In order to achieve the above purpose, a technical solution adopted by the present invention is:

[0006] A radioactive metal channel underwater stripping device, comprising an underwater stripping device body, a control cabinet, a compressed air system and a special water tank, wherein:

[0007] The special water tank is sealed on four sides and at the bottom, with an opening at the top, and is placed in the spent fuel storage pool when in use;

[0008] The underwater stripping device body includes a rotating lifting assembly and a cutting unit. The rotating lifting assembly is arranged on the top of the special water tank. The rotating lifting assembly includes a fixed operating frame, a rotating unit and a clamping lifting unit. The fixed operating frame is the carrier of the device and provides support for the rotating unit and the clamping lifting unit. The rotating unit is used to control the rotation of the process pipe. The lower end of the clamping lifting unit is connected to the cutting unit. The cutting unit is arranged inside the special water tank. The cutting unit is lifted and lowered by the clamping lifting unit, so as to achieve cutting of process pipes of different lengths.

[0009] The control cabinet and the compressed air system are placed outside the spent fuel storage pool. The control cabinet is used to intelligently control the stripping process, and the compressed air system is used to provide air source power for the device.

[0010] Furthermore, in the radioactive metal channel underwater stripping device as described above, the fixed operating frame includes a bracket and a support beam, the bracket serves as a mounting platform for the various components of the rotating lifting assembly, and its lower end is connected to the support beam, and the support beam is fixed to the upper end of the dedicated water tank.

[0011] Furthermore, in the underwater stripping device for the radioactive metal channel as described above, the rotating unit includes a first servo motor, a reducer, a driving gear, a slewing bearing, an adapter plate and a three-jaw chuck. The first servo motor and the reducer are inverted and fixed on the lower surface of the bracket, the driving gear and the slewing bearing are fixed on the upper surface of the bracket, the adapter plate is connected to the three-jaw chuck and the slewing bearing, and the three-jaw chuck is used to fix and clamp the process pipe. Under the drive of the first servo motor and the reducer, the driving gear drives the slewing bearing to rotate, and then drives the three-jaw chuck to rotate, thereby realizing the rotation of the process pipe.

[0012] Furthermore, in the radioactive metal channel underwater stripping device as described above, the clamping and lifting unit includes a second servo motor, a ball screw and a guide tube, the second servo motor is fixed to the upper surface of the bracket through a motor flange, and the output shaft of the second servo motor is connected to the ball screw through a coupling; a slide is provided on the ball screw, and the slide is fixed on a guide rail, and the guide rail is fixed on the bracket; the guide tube is connected to the slide, and the tail end of the guide tube is connected to the cutting unit; under the action of the second servo motor, the ball screw drives the slide and the guide tube to rise and fall, thereby driving the cutting unit to rise and fall, so as to cut tubular waste of different lengths.

[0013] Furthermore, in the above-mentioned radioactive metal channel underwater stripping device, the top end of the guide pipe is in a trumpet shape, which can be used to perform initial positioning of the process pipe.

[0014] Furthermore, in the above-mentioned radioactive metal channel underwater stripping device, a clamping block is provided on the guide tube, and the clamping block is connected to the slide table through a clamping seat. The guide tube is clamped by the clamping block to prevent the guide tube from sliding during the cutting process.

[0015] Further, in the above-mentioned radioactive metal channel underwater stripping device, the cutting unit includes a connecting bottom plate, a guide rail slider assembly, a cutting feed assembly, a cutting assembly and a clamping assembly, and the cutting unit is fixed to the tail end of the guide tube through the connecting bottom plate; the guide rail slider assembly is fixed to the connecting bottom plate;

[0016] The cutting feed assembly comprises a feed cylinder, the feed cylinder is fixed on a cylinder seat, a piston rod of the feed cylinder is connected to a tie rod through a tie rod cross beam, the other end of the tie rod is connected to a cutting slide, the cylinder seat is fixed, and the cutting slide is fixed on a slide of the guide rail slide assembly;

[0017] The cutting assembly comprises an air motor, which is fixed to the cutting slide via a spindle holder, and the end of the output shaft of the air motor is connected to a flat-bottomed sharp knife;

[0018] The clamping assembly is used to clamp the process pipe, and comprises a positioning block, an auxiliary support block and an elastic assembly, wherein the positioning block is fixed on the cylinder seat, and the auxiliary support block is arranged on the cutting slide and connected to the cutting slide via the elastic assembly;

[0019] The cutting slide is driven to translate by the movement of the piston rod in the feed cylinder, thereby realizing the cutting feed of the flat-bottomed sharp knife; the flat-bottomed sharp knife is driven to rotate at a high speed by the pneumatic motor, thereby realizing the cutting of the process pipe.

[0020] Furthermore, in the radioactive metal channel underwater stripping device as described above, a V-shaped groove of the same shape and size is opened in the middle of the positioning block and the auxiliary support block, and the process pipe is clamped by the two V-shaped grooves; the positioning block and the auxiliary support block have the same thickness and the same horizontal height, ensuring that no shear force is generated when cutting the process pipe.

[0021] Furthermore, in the radioactive metal channel underwater stripping device as described above, the cutting unit also includes a U-shaped stopper, which is arranged directly below the guide tube and fixed to the connecting base plate by screws for positioning the process tube.

[0022] Furthermore, as described above, the underwater stripping device for radioactive metal channels, the underwater stripping device body also includes a camera unit, which is arranged on the connecting base plate and is used to record the underwater real-time stripping and cutting images, and transmit the process pipe stripping and cutting images to the display of the control cabinet in real time for real-time display.

[0023] The radioactive metal channel underwater stripping device of the present invention has the following significant technical effects:

[0024] 1. The underwater stripping, cutting and transportation operations of the radioactive channels are all carried out underwater to reduce the radiation dose of the operators;

[0025] 2. The mechanical part of the present invention has a reasonable design structure, conforms to ergonomics, and is easy to install and operate;

[0026] 3. The control part has functions such as remote start and stop and real-time monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of system connections of an underwater channel stripping device provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the main structure of the underwater stripping device in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of a rotary lifting assembly according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of a stripping unit according to an embodiment of the present invention;

[0031] Figure 5 It is a cross-sectional view of the stripping unit AA according to an embodiment of the present invention;

[0032] In the figure: 1-underwater stripping device body; 2-control cabinet; 3-compressed air system; 4-special water tank; 100-rotating lifting assembly; 200-cutting unit; 300-camera unit;

[0033] 101- bracket; 102- first servo motor; 103- speed reducer; 104- driving gear; 105- slewing bearing; 106- adapter plate; 107- three-jaw chuck; 108- second servo motor; 109- motor flange; 110- coupling; 111- ball screw; 112- guide rail; 113- slide table; 114- clamping seat; 115- clamping block; 116- guide tube; 117- support beam; 118- fixing ring; 119- support shaft; 120- base;

[0034] 201-connecting base plate; 202-guide rail slider assembly; 203-cylinder seat; 204-feed cylinder; 205-pull rod crossbeam; 206-pull rod; 207-positioning block; 208-auxiliary support block; 209-elastic component; 210-spindle holder; 211-pneumatic motor; 212-cutting slide; 213-flat bottom sharp knife; 214-U-shaped stopper. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with specific embodiments and the accompanying drawings.

[0036] In order to deal with the stuck situation of spent fuel, an underwater stripping device for a radioactive metal channel is provided in an embodiment of the present invention, which uses underwater stripping to retrieve the spent fuel in the process tube, so as to achieve successful retrieval of the spent fuel.

[0037] like Figure 1As shown, a radioactive metal channel underwater stripping device provided in an embodiment of the present invention is mainly composed of an underwater stripping device body 1, a control cabinet 2, a compressed air system 3, and a special water tank 4, wherein the special water tank 4 is located in a spent fuel storage pool, is sealed on four sides and the bottom, and is loaded from the top to provide an installation space for an underwater cutting machine and an underwater cutting environment; the underwater stripping device body 1 is mainly composed of a rotating lifting assembly 100 and a cutting unit 200, the rotating lifting assembly 100 is arranged on the top of the special water tank 4, and the cutting unit 200 is arranged inside the special water tank 4, and the rotating lifting assembly 100 is arranged on the top of the special water tank 4. The assembly 100 can rotate the process tube and lift it up and down so as to cut tubular wastes of different lengths; at the same time, the cutting unit 200 can be lifted above the water surface by rotating the lifting assembly 100, so as to facilitate the replacement of the cutting tool; the cutting unit 200 adopts an air motor 211 to provide power for the flat-bottomed sharp knife 213, and the feeding is realized under the action of the feeding cylinder 204 to realize the cutting of the metal tubular waste; the control cabinet 2 and the compressed air system 3 are placed on the ground of the spent fuel storage pool, and the stripping process is intelligently controlled by the control cabinet 2, and the compressed air system 3 provides air source power for the stripping device.

[0038] like Figure 2 and 3 As shown, the rotating lifting assembly 100 is mainly composed of a fixed operating frame, a rotating unit and a clamping lifting unit. The fixed operating frame is the carrier of the entire process pipe underwater stripping and cutting device, and provides support for the rotating unit and the clamping lifting unit.

[0039] The fixed operating frame is mainly composed of a bracket 101, a support beam 117, a fixing ring 118, a support shaft 119 and a base 120. The bracket 101 serves as a mounting platform for the various components of the rotating lifting assembly 100, and its lower end is connected to the support beam 117. The support beam 117 is fixed to the base 120 through the fixing ring 118 and the support shaft 119, and the base 120 is fixed to the dedicated water tank 4 by bolts.

[0040] The rotating unit is used to control the rotation of the process tube, so as to realize the cross-cutting of the process tube. The rotating unit is mainly composed of a first servo motor 102, a reducer 103, a driving gear 104, a slewing bearing 105, an adapter plate 106 and a three-jaw chuck 107. The first servo motor 102 and the reducer 103 are inverted and fixed on the lower surface of the bracket 101, the driving gear 104 and the slewing bearing 105 are fixed on the upper surface of the bracket 101 by screws, and the adapter plate 106 is connected with the three-jaw chuck 107 and the slewing bearing 105. The three-jaw chuck 107 is used to fix and clamp the process tube. Driven by the first servo motor 102 and the reducer 103, the driving gear 104 drives the slewing bearing 105 to rotate, thereby rotating the three-jaw chuck 107 connected thereto, and driving the process tube fixed on the three-jaw chuck 107 to rotate together.

[0041] The clamping and lifting unit is used to control the up and down movement of the cutting unit 200, so as to realize cutting at any position of the process tube. The clamping and lifting unit is mainly composed of a second servo motor 108, a motor flange 109, a coupling 110, a ball screw 111, a guide rail 112, a slide 113, a clamping seat 114, a clamping block 115, and a guide tube 116. The second servo motor 108 is fixed to the upper surface of the bracket 101 through the motor flange 109, and its lower end is connected to the coupling 110. The other end of the coupling 110 is connected to the ball screw 111, and the slide 113 is provided on the ball screw 111. The slide 113 is fixed on the guide rail 112, and the guide rail 112 is fixed on the bracket 101 by bolts; the guide tube 116 is fixed on the slide 113 by the clamping block 115 and the clamping seat 114, and the top of the guide tube 116 is in a trumpet shape, which can be used to initially position the process tube; the clamping block 115 is sleeved on the guide tube 116, which can clamp the guide tube 116 to prevent the guide tube from sliding during the cutting process; the tail end of the guide tube 116 is connected to the cutting unit 200. Under the power provided by the second servo motor 108, the ball screw 111 drives the slide 113 and the guide tube 116 to rise and fall along the guide rail slider 30, thereby driving the cutting unit 200 to move up and down to cut process tubes of different lengths. The lifting stroke of the clamping and lifting unit meets the requirements for cross-cutting and longitudinal cutting of process tubes.

[0042] like Figure 4 and 5 As shown, the cutting unit 200 is mainly composed of a connecting base plate 201, a guide rail slider assembly 202, a cutting feed assembly, a cutting assembly and a clamping assembly. The entire cutting unit 200 is fixed to the tail end of the guide tube 116 through the connecting base plate 201; the guide rail slider assembly 202 is fixed to the connecting base plate 201, and the guide rail slider assembly 202 includes a linear guide rail, and the linear guide rail is provided with a first slider and a second slider. In this embodiment, the guide rail slider assembly 202 includes two rows of parallel linear guide rails, and each linear guide rail is provided with a first slider and a second slider.

[0043] The cutting feed assembly includes a feed cylinder 204, which is fixed to the cylinder seat 203 by screws, and the piston rod of the feed cylinder 204 is connected to the tie rod 206 through the tie rod cross beam 205, and the other end of the tie rod 206 is connected to the cutting slide 212, the cylinder seat 203 is fixed to the first slider by screws, and the cutting slide 212 is fixed to the second slider by screws; the front and rear ends of the cylinder seat 203 are respectively provided with limit blocks, which are fixed to the connecting bottom plate 201 and are used to restrict the movement of the feed cylinder 204. The pressure energy of the compressed air is converted into mechanical energy through the movement of the piston rod in the feed cylinder 204, driving the cutting slide 212 to translate along the linear guide rail of the guide rail slider assembly 202, thereby realizing the cutting feed of the cutting assembly.

[0044] The cutting assembly includes an air motor 211 and a flat-bottomed sharp knife 213. The air motor 211 is fixed on the cutting slide 212 through a spindle holder 210. The end of the output shaft of the air motor 211 is connected to the flat-bottomed sharp knife 213. The air motor 211 drives the flat-bottomed sharp knife 213 to rotate at high speed, thereby realizing cutting of the process tube.

[0045] The clamping assembly is used to clamp the process pipe, which includes a positioning block 207, an auxiliary support block 208 and an elastic assembly 209. The positioning block 207 is fixed on the cylinder seat 203, and the auxiliary support block 208 is arranged on the cutting slide 212 and connected to the cutting slide 212 through the elastic assembly 209; V-shaped grooves of the same shape and size are opened in the middle of the positioning block 207 and the auxiliary support block 208, and the process pipe is clamped by the two V-shaped grooves, and the positioning block 207 and the auxiliary support block 208 have the same thickness and the same horizontal height, so as to ensure that no shear force is generated when the process pipe is cut.

[0046] The U-shaped stopper 214 is arranged just below the guide tube 116 and fixed to the connecting bottom plate 201 by screws for positioning the process tube. After the cutting is completed, the cutting unit 200 moves backwards to facilitate the removal of the waste cut from the bottom of the water tank 4.

[0047] The camera unit 300 is disposed on the connecting bottom plate 201 and is used to record the real-time underwater peeling and cutting images, and can transmit the process pipe peeling and cutting images to the display in real time.

[0048] The control cabinet 2 is mainly composed of a monitoring display and operating buttons. The monitoring display can display the underwater cutting picture in real time; the operating buttons are used to start and stop the cutting unit, open and close the feed door, and switch the system power on and off.

[0049] The compressed air system 3 is composed of a small air compressor, which is used to provide air source for the feed gate cylinder.

[0050] The invention provides an underwater stripping device for a radioactive metal channel. The main body of the underwater stripping device is installed in a special water tank. The stripping and cutting of the workpiece is carried out in the special water tank, so as to reduce the exposure dose of operators. The stripping unit adopts a flat-bottomed sharp knife to pneumatically strip and cut the metal process pipe. A video monitoring device is equipped to transmit the stripping and cutting process to a display device in real time. The control cabinet carries out intelligent control of the stripping process, and has functions such as remote start and stop and real-time monitoring. The compressed air system is placed on the ground of a spent fuel storage pool to provide an air source for a feed door cylinder. The special water tank is located in the spent fuel storage pool, is sealed on four sides and at the bottom, and is loaded from the top.

[0051] The above embodiments are merely illustrative of the present invention, and the present invention may also be implemented in other specific ways or other specific forms without departing from the gist or essential features of the present invention. Therefore, the described embodiments should be considered illustrative rather than restrictive in any respect. The scope of the present invention should be described by the appended claims, and any changes equivalent to the intent and scope of the claims should also be included within the scope of the present invention.

Claims

1. A radioactive metal channel underwater stripping device, characterized in that: The device comprises an underwater stripping device body (1), a control cabinet (2), a compressed air system (3) and a dedicated water tank (4), wherein: The dedicated water tank (4) is sealed on four sides and at the bottom, and is open at the top, and is placed in the spent fuel storage pool when in use; The underwater stripping device body (1) comprises a rotating lifting assembly (100) and a cutting unit (200). The rotating lifting assembly (100) is arranged on the top of the special water tank (4). The rotating lifting assembly (100) comprises a fixed operating frame, a rotating unit and a clamping and lifting unit. The fixed operating frame is a carrier of the device and provides support for the rotating unit and the clamping and lifting unit. The rotating unit is used to control the rotation of the process pipe. The lower end of the clamping and lifting unit is connected to the cutting unit (200). The cutting unit (200) is arranged inside the special water tank (4). The cutting unit (200) is lifted and lowered by the clamping and lifting unit, thereby cutting process pipes of different lengths. The fixed operating frame comprises a bracket (101) and a support beam (117); the bracket (101) serves as a mounting platform for various components of the rotary lifting assembly (100); the lower end of the bracket (101) is connected to the support beam (117); and the support beam (117) is fixed to the upper end of the dedicated water tank (4); The clamping and lifting unit comprises a second servo motor (108), a ball screw (111) and a guide tube (116); the second servo motor (108) is fixed to the upper surface of the bracket (101) via a motor flange (109); the output shaft of the second servo motor (108) is connected to the ball screw (111) via a coupling (110); a slide table (113) is arranged on the ball screw (111), and the slide table (113) is fixed on the guide rail (111). 2), the guide rail (112) is fixed on the bracket (101); the guide tube (116) is connected to the slide table (113), and the tail end of the guide tube (116) is connected to the cutting unit (200); under the action of the second servo motor (108), the ball screw (111) drives the slide table (113) and the guide tube (116) to rise and fall, thereby driving the cutting unit (200) to rise and fall, so as to cut tubular wastes of different lengths; The control cabinet (2) and the compressed air system (3) are placed outside the spent fuel storage pool; the control cabinet (2) is used to intelligently control the stripping process; and the compressed air system (3) is used to provide air source power for the device.

2. The radioactive metal channel underwater stripping device according to claim 1, characterized in that: The rotating unit comprises a first servo motor (102), a reducer (103), a driving gear (104), a slewing bearing (105), an adapter plate (106) and a three-jaw chuck (107); the first servo motor (102) and the reducer (103) are invertedly fixed on the lower surface of the bracket (101); the driving gear (104) and the slewing bearing (105) are fixed on the upper surface of the bracket (101); the adapter plate (106) is connected to the three-jaw chuck (107) and the slewing bearing (105); the three-jaw chuck (107) is used to fix and clamp the process pipe; under the drive of the first servo motor (102) and the reducer (103), the driving gear (104) drives the slewing bearing (105) to rotate, thereby driving the three-jaw chuck (107) to rotate, thereby realizing the rotation of the process pipe.

3. The radioactive metal channel underwater stripping device according to claim 1, characterized in that: The top end of the guide tube (116) is in a bell-mouth shape, and can be used to initially position the process tube.

4. The radioactive metal channel underwater stripping device according to claim 1, characterized in that: The guide tube (116) is sleeved with a clamping block (115), and the clamping block (115) is connected to the slide table (113) via a clamping seat (114). The guide tube (116) is clamped by the clamping block (115) to prevent the guide tube from sliding during the cutting process.

5. The radioactive metal channel underwater stripping device according to claim 1, characterized in that: The cutting unit (200) comprises a connecting base plate (201), a guide rail slider assembly (202), a cutting feed assembly, a cutting assembly and a clamping assembly; the cutting unit (200) is fixed to the rear end of the guide tube (116) via the connecting base plate (201); the guide rail slider assembly (202) is fixed to the connecting base plate (201); The cutting feed assembly comprises a feed cylinder (204), the feed cylinder (204) is fixed on a cylinder seat (203), a piston rod of the feed cylinder (204) is connected to a pull rod (206) via a pull rod cross beam (205), the other end of the pull rod (206) is connected to a cutting slide (212), the cylinder seat (203) is fixed, and the cutting slide (212) is fixed on a slide of the guide rail slide assembly (202); The cutting assembly comprises an air motor (211), the air motor (211) is fixed on the cutting slide (212) via a spindle holder (210), and the end of the output shaft of the air motor (211) is connected to a flat-bottomed sharp knife (213); The clamping assembly is used to clamp the process pipe, and comprises a positioning block (207), an auxiliary support block (208) and an elastic assembly (209); the positioning block (207) is fixed on the cylinder seat (203); the auxiliary support block (208) is arranged on the cutting slide (212) and connected to the cutting slide (212) via the elastic assembly (209); The cutting slide (212) is driven to translate by the movement of the piston rod in the feed cylinder (204), thereby realizing the cutting feed of the flat-bottomed sharp knife (213); and the flat-bottomed sharp knife (213) is driven to rotate at a high speed by the pneumatic motor (211), thereby realizing the cutting of the process pipe.

6. The radioactive metal channel underwater stripping device according to claim 5, characterized in that: The positioning block (207) and the auxiliary support block (208) are both provided with V-shaped openings of the same shape and size in the middle, and the process pipe is clamped by the two V-shaped openings; the positioning block (207) and the auxiliary support block (208) have the same thickness and the same horizontal height, so as to ensure that no shear force is generated when the process pipe is cut.

7. The radioactive metal channel underwater stripping device according to claim 5, characterized in that: The cutting unit (200) further comprises a U-shaped stopper (214), which is arranged directly below the guide tube (116) and fixed to the connecting base plate (201) by screws, and is used for positioning the process tube.

8. The radioactive metal channel underwater stripping device according to any one of claims 5 to 7, characterized in that: The underwater stripping device body (1) further comprises a camera unit (300), which is arranged on the connection base plate (201) and is used to record the underwater real-time stripping and cutting images, and transmit the process pipe stripping and cutting images to the display of the control cabinet (2) in real time for real-time display.

Images