A nuclear power plant radioactive waste compaction cake grab

Abstract

The present application belongs to the field of nuclear power plant radioactive waste treatment, and particularly relates to a nuclear power plant radioactive waste compaction cake grab. The nuclear power plant radioactive waste compaction cake grab comprises a travelling crane fixing assembly, a rotating assembly, a compaction cake grabbing and placing assembly and an instrument detection switch. The compaction cake grabbing and placing assembly is connected with the fixing assembly, the rotating assembly and the instrument detection switch. The nuclear power plant radioactive waste compaction cake grab has the following advantages: (1) the compaction cake grab is provided with a rotating motor, and can rotate at any angle to reduce the manual rotation operation of the steel barrel by the on-site operator and reduce the operation dose of the operator; and (2) the grab adopts a steel wire rope lifting structure, and adopts a cooperation mode of a guide wheel and a guide fixed plate. When the compaction cake assembly is lifted to the highest position, the guide plate 203 cooperates with the guide wheel 104 to prevent the shaking of the compaction cake grab.

Description

Technical Field

[0001] This invention belongs to the field of radioactive waste treatment in nuclear power plants, and specifically relates to a compaction cake gripper for radioactive waste in nuclear power plants. Background Technology

[0002] Radioactive dry waste from nuclear power plants is typically sorted and then placed in 160L or 200L steel drums. After being manually sealed, the drums are sent to an overpressure machine to be overpressurized into drum cakes.

[0003] After overpressure, the compacted cake is loaded into a 200L or 400L steel drum using a compaction cake gripper for subsequent cement fixing. According to national standards, when cement fixing the steel drum containing the compacted cake, a 20mm-30mm thick cement fixing layer must be ensured around the compacted cake. Therefore, a central support for the compacted cake is installed inside the steel drum used in nuclear power plants. This central support has three or a certain number of columns extending from the bottom to the top surface of the drum. The compaction cake gripper is fixed to a guide rail on the ceiling of the room by a steel wire rope and a trolley. When the trolley moves to the compacted cake position, the steel wire rope descends, the gripper opens, and the gripper clamps the compacted cake pneumatically or electrically. After clamping, the gripper rises, the trolley moves to the position of the steel drum, the gripper lowers the cake to the bottom of the drum, and then the gripper opens again and rises again. To minimize radioactive waste, the gap between the compaction cake and the steel drum is generally the outer diameter of the compaction cake gripper when it is open, with a certain margin. Therefore, the position of the compaction cake gripper must not overlap with the position of the central support of the compaction cake inside the steel drum; otherwise, the compaction cake cannot be placed into the steel drum.

[0004] Therefore, in order to safely place the compressed cakes into the steel drum, personnel must place them into the drum at a fixed angle, ensuring that the cake gripper avoids the central support column, or personnel must manually rotate the steel drum on-site. This operation is complex, prone to human error, and the compressed cakes contain a certain amount of radioactivity, which will cause external radiation exposure to personnel. Summary of the Invention

[0005] The purpose of this invention is to provide a compaction cake gripper with a rotating gripper function, which can effectively reduce the labor intensity of personnel or external radiation. Operators can rotate the gripper in the control room according to the camera display and then load the compaction cake into the steel drum, avoiding the need for personnel to load the drum at a specified angle on site or manually rotate the steel drum.

[0006] The technical solution of the present invention is as follows: a nuclear power plant radioactive waste compaction cake gripper, comprising a crane fixing component, a rotating component, a compaction cake gripping and releasing component, and an instrument detection switch, wherein the compaction cake gripping and releasing component is connected to the fixing component, the rotating component, and the instrument detection switch.

[0007] The aforementioned trolley fixing assembly includes an axle support, an axle, a guide wheel, and a guide wheel support plate. The fixing assembly is fixed to the traveling trolley of the upstream hoisting equipment via the axle support and the axle.

[0008] The guide wheel cooperates with the rotating component fixing plate in the rotating assembly to reduce the shaking of the compaction cake gripper when it moves with the trolley.

[0009] The guide wheels are provided in a total of four sets along the circumference, each corresponding to the angle of the lifting wire rope.

[0010] The rotating assembly includes a lifting wire rope, a rotating motor, a rotating assembly fixing plate, a drive gear, a movable pulley, and a slewing bearing. The upstream end of the lifting wire rope is connected to the trolley winding drum, and the rotation of the upstream trolley winding drum controls the overall lifting and lowering of the compaction cake gripper. The other end of the lifting wire rope passes through the movable pulley, which is fixed to the upper surface of the slewing bearing. The rotating motor is a three-in-one motor that drives the drive gear to rotate. The drive gear meshes with the slewing bearing. The rotating assembly fixing plate covers the outside of the slewing bearing, and the slewing bearing is fixedly connected to the compaction cake gripper assembly.

[0011] The drive gear and slewing bearing are external gear meshing.

[0012] The compacted cake gripping and releasing assembly includes a protective cover, an electric push rod, a structural guide plate, and a gripper. The protective cover is used to protect the drive gear and the slewing bearing. The electric push rod includes a protective sleeve and an electric pushing mechanism. The connecting rod is connected to the gripper and drives the gripper to run horizontally. The gripper directly contacts the compacted cake.

[0013] The gripper adopts a three-piece or four-piece structure.

[0014] The instrument detection switch includes three detection switches.

[0015] The beneficial effects of the present invention are as follows: (1) The compaction cake gripper is equipped with a rotary motor, which can rotate the gripper at any angle to reduce the manual rotation operation of the steel drum by the on-site operators and reduce the workload of the personnel; (2) The gripper adopts a wire rope lifting structure and adopts a guide wheel and guide fixing plate in combination. When the compaction cake assembly is lifted to the highest point, the rotating assembly fixing plate 203 cooperates with the guide wheel 104 to prevent the compaction cake gripper from shaking. Attached Figure Description

[0016] Figure 1 A general structural drawing of a nuclear power plant radioactive waste compaction cake gripper provided by the present invention;

[0017] Figure 2 An exploded view of a component of a nuclear power plant radioactive waste compaction chuck provided by the present invention.

[0018] In the diagram: 1. Crane fixing assembly; 2. Rotating assembly; 3. Compactor cake gripping assembly; 4. Instrument detection switch; 101. Shaft; 102. Shaft support; 103. Guide wheel support plate; 104. Guide wheel; 201. Lifting wire rope; 202. Rotary motor; 203. Rotating assembly fixing plate; 204. Drive gear; 205. Counterweight; 206. Moving pulley; 207. Slewing bearing; 208. Base plate; 301. Protective cover; 303. Structural guide plate; 305. Grip; 310. Electric push rod; 401. Detection switch. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, a nuclear power plant radioactive waste compaction cake gripper includes a traveling fixed component 1, a rotating component 2, a compaction cake gripping and releasing component 3, and an instrument detection switch 4. The compaction cake gripping and releasing component 3 is connected to the fixed component 1, the rotating component 2, and the instrument detection switch 4.

[0021] like Figure 2 As shown, the trolley fixing assembly 1 includes an axle support 102, an axle 101, guide wheels 104, and a guide wheel support plate 103. The entire fixing assembly 1 is fixed to the traveling trolley of the upstream hoisting equipment via the axle support 102 and the axle 101, and can move with the trolley. The guide wheels 104 cooperate with the rotating assembly fixing plate 203 in the rotating assembly 2 to reduce the swaying of the compaction plate gripper when it moves with the trolley. There are a total of four sets of guide wheels 104 along the circumferential direction, corresponding to the angle of the lifting wire rope 201.

[0022] The rotating assembly 2 includes a lifting wire rope 201, a rotary motor 202, a rotating assembly fixing plate 203, a drive gear 204, a counterweight 205, a movable pulley 206, a slewing bearing 207, and a base plate 208. The lifting wire rope 201 is connected upstream to the trolley's winding drum, and its rotation along with the upstream system's trolley winding drum controls the overall lifting and lowering of the compaction cake gripper. The other end of the lifting wire rope 201 passes through the movable pulley 206, which is fixed to the upper surface of the slewing bearing 207 to support the overall weight of the compaction cake gripper. The rotary motor 202 is a three-in-one motor that drives the drive gear 204 to rotate. The drive gear 204 meshes with the slewing bearing 207, and the drive gear 204 and the slewing bearing 207 are externally geared. The rotary motor drives the slewing bearing 207 to rotate. A structural guide plate 303, a drive gear 204, a rotary bearing 207, and a protective cover 301 are mounted on the base plate 208, forming the main power component mounting plate. A rotating component fixing plate 203 covers the rotary bearing 207 and is fixed to the base plate 208; it can be welded or bolted. The rotary bearing 207 is fixedly connected to the compaction plate gripping assembly 3, ultimately driving the gripping assembly 3 to rotate. A counterweight 205 is used to balance the overall center of the rotating component 2, controlling the center position of the component to balance the force on the four lifting steel wire ropes 201. The counterweight 205 is fixed to the base plate 208.

[0023] The compacted cake gripping and releasing assembly 3 includes a protective cover 301, an electric push rod 310, a structural guide plate 303, and a gripper 305. The protective cover 301 protects the drive gear 204 and the rotary bearing 207 to prevent foreign objects from entering between the gears. The protective cover 301 is bolted to the base plate 208. The electric push rod 310 includes a protective sleeve 311 and an electric pushing mechanism 312. The protective sleeve 311 and the electric pushing mechanism 312 are fixed by side wall bolt holes. A small motor is integrated inside. The assembly is a complete set of equipment. It moves horizontally left and right. The control link 308 is connected to the electric push rod 310 through a rotating shaft. Finally, the control link 308 moves horizontally. The link 308 is connected to the gripper 305 and drives the gripper 305 to move horizontally, so as to realize the gripping and releasing of the compacted cake. The gripper 305 directly contacts the compacted cake 5, controlling the gripping of the compacted cake through static friction. The gripper 305 can be a three-piece or four-piece structure, depending on the number of central support columns for the compacted cake inside the steel drum and the overall stress on the gripper. The structural guide plate 303 mainly serves to guide the compacted cake gripping assembly as it is lifted away from the steel drum. The structural guide plate 303 is fixed to the outer frame of the electric push rod 310 by bolts.

[0024] The instrument detection switch 4 includes three detection switches 401. Each detection switch 401 has a threaded structure and is fixed on the bottom fixed bracket of the electric push rod 310. When the compaction cake gripper descends to grab the compaction cake, the three detection switches 401 trigger signals to the control system. The surface compaction cake gripper has made contact with the cake, and the upstream trolley winding drum motor stops rotating, the wire rope 201 stops descending, and then the clamping action of the gripper 305 is executed.

[0025] The angle of the central support column inside the steel drum can be observed in the control room via a camera built into the upstream system or a camera installed on the structural guide plate 303. The operator controls the rotating motor 202 according to the camera. The rotating motor 202 can be stopped when the gripper 305 rotates to an angle that does not collide with the central support column inside the steel drum.

[0026] The traveling trolley and track are not described in detail in this equipment description, but the motor on the traveling trolley is equipped with necessary proximity switches and weighing sensors to determine when the compaction cake gripper is raised and lowered into place.

[0027] The working process of this invention is as follows:

[0028] 1. The upstream system trolley drives the barrel cake selection gripper to move above the compacted cake 5 that needs to be gripped;

[0029] 2. The upstream system trolley reel motor rotates, driving the wire rope 201 down; until the drum cake approaches and the detection switch 401 is triggered;

[0030] 3. When the electric push rod 310 is energized, it drives the gripper 305 to grip and compact the cake 5;

[0031] 4. The upstream system trolley restarts the winding drum motor, and the wire rope 201 rises until the rotating component fixing plate 203 and the guide wheel 104 are fully engaged and in contact, and the rope rises to the designated position.

[0032] 5. The upstream system trolley moves the compaction cake grabber to directly above the steel drum that needs to receive the compaction cake;

[0033] 6. The upstream system trolley starts the winding drum motor, and the wire rope 201 stops descending after reaching the upper surface of the steel drum;

[0034] 7. The operator in the control room controls the rotary motor 202 to rotate to a specified angle through the upstream system camera or the camera integrated on the structural guide plate 303, so that the gripper 305 does not collide with the central support column of the compacted cake inside the steel barrel.

[0035] 8. The upstream system trolley starts the winding drum motor, and the wire rope 201 descends to the bottom of the steel drum. When the weighing sensor of the upstream system trolley returns a weightlessness signal, the winding drum motor stops running, and the wire rope 201 stops descending.

[0036] 9. When the electric push rod 310 loses power, the drive linkage 308 opens, which in turn drives the gripper 305 to open completely;

[0037] 10. When the gripper 305 is fully opened, the upstream system trolley starts the winding drum motor, and the wire rope 201 rises until the compaction cake gripper rises to the initial position, that is, the rotating component fixing plate 203 and the guide wheel 104 are fully engaged and in contact, and rises to the position.

[0038] 11. Once the single compacted cake grabbing process is complete, the system will either power off or proceed with grabbing the second compacted cake.

[0039] In the above process, the open and closed states of the compaction cake gripper 305 can be fed back by adding a proximity switch to the compaction cake gripper assembly 3, or by setting a delay time in the control program before proceeding to the next action; similarly, the operation of the electric push rod 310 can also be supported by adding a proximity switch or by setting a delay time in the control program before proceeding to the next action.

Claims

1. A compaction cake gripper for radioactive waste from nuclear power plants, characterized in that: It includes a vehicle fixing component, a rotating component, a compacted cake gripping and releasing component, and an instrument detection switch. The compacted cake gripping and releasing component is connected to the fixing component, the rotating component, and the instrument detection switch. The aforementioned crane fixing assembly includes an axle support, an axle, a guide wheel, and a guide wheel support plate. The fixing assembly is fixed to the traveling trolley of the upstream hoisting equipment via the axle support and the axle. The guide wheel cooperates with the rotating component fixing plate in the rotating component to reduce the shaking of the compaction cake gripper when it moves with the trolley; The rotating assembly includes a lifting wire rope, a rotating motor, a rotating assembly fixing plate, a drive gear, a movable pulley, and a slewing bearing. The upstream end of the lifting wire rope is connected to the trolley winding drum, and the rotation of the upstream trolley winding drum controls the overall lifting and lowering of the compaction cake gripper. The other end of the lifting wire rope passes through the movable pulley, which is fixed to the upper surface of the slewing bearing. The rotating motor is a three-in-one motor that drives the drive gear to rotate. The drive gear meshes with the slewing bearing. The rotating assembly fixing plate covers the outside of the slewing bearing, and the slewing bearing is fixedly connected to the compaction cake gripper assembly.

2. The nuclear power plant radioactive waste compaction cake gripper as described in claim 1, characterized in that: The guide wheels are provided in a total of four sets along the circumference, each corresponding to the angle of the lifting wire rope.

3. The nuclear power plant radioactive waste compaction cake gripper as described in claim 1, characterized in that: The drive gear and slewing bearing are external gear meshing.

4. The nuclear power plant radioactive waste compaction cake gripper as described in claim 1, characterized in that: The compacted cake gripping and releasing assembly includes a protective cover, an electric push rod, a structural guide plate, and a gripper. The protective cover is used to protect the drive gear and the slewing bearing. The electric push rod includes a protective sleeve and an electric pushing mechanism. The connecting rod is connected to the clamp and drives the clamp to run horizontally. The clamp directly contacts the compacted cake.

5. The nuclear power plant radioactive waste compaction cake gripper as described in claim 4, characterized in that: The fixture adopts a three-piece or four-piece structure.

6. The nuclear power plant radioactive waste compaction cake gripper as described in claim 1, characterized in that: The instrument detection switch includes three detection switches.

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