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CN-115985533-B - Rod taking device and rod replacing method

CN115985533BCN 115985533 BCN115985533 BCN 115985533BCN-115985533-B

Abstract

The invention discloses a rod taking device and a rod replacing method, comprising a box body, a power unit, an executing unit and a control unit, wherein the power unit and the executing unit are arranged in the box body, the control unit is in communication connection with the power unit, the executing unit comprises a core rod, clamping jaws, a locking pipe and an outer sleeve, the core rod, the clamping jaws and the locking pipe are arranged in the outer sleeve and can move along the axial direction of the outer sleeve, the locking pipe is sleeved on the core rod and the clamping jaws and can move along the axial direction of the core rod, two ends of the core rod are respectively connected with the power unit and the clamping jaws, and one end of the clamping jaws, which is far away from the core rod, is provided with a pawl for grabbing a fuel rod to be replaced. The rod taking device can safely extract the fuel rods to be replaced from the new fuel assembly.

Inventors

  • TAN ZIWEN
  • QIAO SUKAI
  • CHEN PENGYIN
  • HUANG JIAWU
  • LI LIANGLIANG
  • LIU PING
  • JIANG DONG
  • Sun xiwang

Assignees

  • 中广核核电运营有限公司
  • 中国广核集团有限公司
  • 中国广核电力股份有限公司

Dates

Publication Date
20260505
Application Date
20221121

Claims (10)

  1. 1. The rod taking device is characterized by comprising a box body (5), a power unit (1) arranged in the box body (5), an execution unit (2) and a control unit (3) in communication connection with the power unit (1); The execution unit (2) comprises a core bar (22), clamping jaws (23), a locking pipe (24) and an outer sleeve (25), wherein the core bar (22), the clamping jaws (23) and the locking pipe (24) are arranged in the outer sleeve (25) and can move along the axial direction of the outer sleeve (25), the locking pipe (24) is sleeved on the core bar (22) and the clamping jaws (23) and can move along the axial direction of the core bar (22), two ends of the core bar (22) are respectively connected with the power unit (1) and the clamping jaws (23), and a pawl (231) for grabbing a fuel rod (6) to be replaced is arranged at one end, far away from the core bar (22), of the clamping jaws (23). The power unit (1) comprises a motor (11), a winding drum (12) and a lifting rope (13), wherein the motor (11) is connected with the winding drum (12), the winding drum (12) is connected with the box body (5), and two ends of the lifting rope (13) are respectively connected with the winding drum (12) and the core bar (22); The execution unit (2) further comprises a balancing weight (21), wherein the balancing weight (21) is sleeved on the outer sleeve (25) and can move along the axial direction of the outer sleeve (25), and the lifting rope (13) is connected with the core bar (22) through the balancing weight; the balancing weight (21) comprises an annular piece and a rib plate (211), wherein the annular piece is sleeved on the outer peripheral wall of the outer sleeve (25), and the rib plate (211) sequentially penetrates through the annular piece and the outer sleeve (25) along the radial direction of the annular piece; The outer sleeve (25) comprises at least two strip-shaped parts with annular cross sections, at least two strip-shaped parts are enclosed and used for the core rod (22), the clamping jaw (23) and the locking tube (24) to pass through, a strip-shaped channel is arranged between two adjacent strip-shaped parts, the strip-shaped channel extends along the axial direction, and two ends of the rib plate (211) respectively pass through the strip-shaped channel to be connected with the annular parts.
  2. 2. The rod taking device according to claim 1, wherein the number of the lifting ropes (13) is at least two, a first through hole (212), at least two second through holes (213) and a first screw hole (214) are formed in the rib plate (211), the first through hole (212) extends along the axial direction of the outer sleeve (25) and is arranged close to the power unit (1), the first screw hole (214) is far away from the power unit (1), the first screw hole (214) is used for being connected with the core rod (22), a gap is reserved between the first through hole (212) and the first screw hole (214), at least two second through holes (213) are respectively arranged on two sides of the gap, and the second through holes (213) extend along the axial direction perpendicular to the outer sleeve (25); one end of each lifting rope (13) sequentially passes through the first through hole (212) and the corresponding second through hole (213) and extends out of the rib plate (211); The balancing weight (21) further comprises a pressing cover (216), wherein the pressing cover (216) is connected with the rib plates (211) and is used for pressing one end, extending out of the rib plates (211), of each lifting rope (13).
  3. 3. Rod extraction device according to claim 2, characterized in that the core rod (22) comprises a body portion (224), a first thread section (221), a second thread section (222) and a third thread section (223); The first thread section (221) is arranged at one end part of the body part (224) and is inserted into the first screw hole (214) for connection, the third thread section (223) is arranged at the other end part of the body part (224) and is connected with the clamping jaw (23), and the second thread section (222) is arranged between the first thread section (221) and the third thread section (223) and is connected with the locking pipe (24).
  4. 4.A rod extraction device according to any one of claims 1-3, characterized in that the strip comprises an inner strip section (251) and an outer strip section (252), the outer strip section (252) being arranged on the peripheral wall of the inner strip section (251) and being connected to the inner strip section (251).
  5. 5. Rod extraction device according to claim 4, characterized in that the outer sleeve (25) further comprises an upper end cap (253), a lower end cap (254) and at least two support rods (255); The upper end cover (253) is connected with the end part, close to the power unit (1), of the outer strip-shaped section (252) and fixes at least two outer strip-shaped sections (252), and the upper end cover (253) is provided with a central through hole for the hanging rope (13) to pass through; One side of the lower end cover (254) is connected with the end part of the outer strip-shaped section (252) far away from the power unit (1) and fixes at least two outer strip-shaped sections (252), and a protection tube (256) for the fuel rod (6) to be replaced to pass through is arranged on the other side of the lower end cover (254); One end of each of the at least two support rods (255) is connected with at least two outer strip-shaped sections (252), and the other ends of the two support rods (255) are connected and fixed with the box body (5).
  6. 6. A rod extraction device according to any one of claims 1 to 3, characterized in that it further comprises a torque sensor (41) and an encoder (42), the power unit (1) further comprising a guide wheel (14); The lifting rope (13) is wound on the guide wheel (14) and extends out to be connected with the balancing weight (21); One end of the moment sensor (41) is connected with the guide wheel (14), and the other end of the moment sensor (41) is connected with the encoder (42).
  7. 7. A rod taking device according to any one of claims 1 to 3, further comprising a limiter (43), wherein the limiter (43) is in communication connection with the control unit (3), the limiter (43) is partially arranged in the box (5) close to the balancing weight (21), and one end of a limiting piece (431) of the limiter (43) extends out of the box (5) and is used for contacting with the balancing weight (21) to trigger the limiter (43) to act.
  8. 8. A rod taking device according to any one of claims 1 to 3, characterized in that the control unit (3) comprises a PLC module (31) for processing data and transmitting control signals, a motor (11) driving module for controlling the direction and rate of rotation of the motor (11), an industrial machine for setting parameters, monitoring and data processing, a wireless transmitting module and a wireless receiving module for establishing communication between the industrial machine and the PLC module (31), a control panel (32) for displaying and modifying parameters, a controller for controlling the operation of the motor (11) and an antenna (33) for providing wireless transmitting and receiving of signals; The PLC module (31), the motor (11) driving module, the wireless transmitting module and the wireless receiving module are all arranged in the box body (5), and the control panel (32) and the antenna (33) are arranged outside the box body (5); an operator port is arranged on the outer side of the box body (5), and the operator is connected to the operator port or is connected in a wireless mode.
  9. 9. A rod changing method, characterized in that the rod taking device according to any one of claims 1 to 8 is used, comprising the steps of: s10, using an auxiliary crane to lift the rod taking device and aligning the rod taking device with the rod position of a fuel rod (6) to be replaced; s20, descending the auxiliary crane main hoisting, and vertically aligning an outer sleeve (25) with guide holes on guide plates with opposite rod positions of the fuel rods (6) to be replaced; s30, starting a power unit (1) to descend a core bar (22), a clamping jaw (23) and a locking pipe (24), and stopping the power unit (1) when the locking pipe (24) is exposed out of the outer sleeve (25) and approaches to the position above the end part of the fuel rod (6) to be replaced; s40, rotating the locking tube (24) to move along the core rod (22) in a direction away from the pawl (231) so that the pawl (231) is opened; s50, continuously starting the power unit (1) to descend the core bar (22) so that the pawl (231) surrounds the periphery of the end part of the fuel rod (6) to be replaced and stops the power unit (1) from acting; S60, rotating the locking pipe (24) to move along the core rod (22) towards a direction approaching to the pawl (231), wherein the pawl (231) is sleeved in the locking pipe (24) and clamped on the periphery of the end part of the fuel rod (6) to be replaced in a closing way; S70, starting the power unit (1) to ascend the core bar (22), driving the fuel rod (6) to ascend by the clamping jaw (23), and stopping the power unit (1) when the fuel rod (6) completely enters the outer sleeve (25); S80, lifting the auxiliary crane main lifting device, moving the rod taking device to the position above a hole site of a temporary storage container, and placing the fuel rods (6) to be replaced into the temporary storage container; and S90, grabbing the stainless steel replacing rod by using the rod taking device and inserting the stainless steel replacing rod back into the original rod position of the fuel rod (6) to be replaced.
  10. 10. The rod changing method according to claim 9, wherein step S90 includes: s91, grabbing a stainless steel replacement rod by using the rod taking device, starting the power unit (1) to ascend the core rod (22), driving the stainless steel replacement rod to ascend by the clamping jaw (23), and stopping the power unit (1) when the stainless steel replacement rod completely enters the outer sleeve (25); S92, using the auxiliary crane to move the rod taking device to the position above the original rod position of the fuel rod (6) to be replaced; s93, descending the auxiliary crane main hoisting, and vertically aligning the outer sleeve (25) to be close to the original rod position of the fuel rod (6) to be replaced; S94, starting the power unit (1) to descend the core rod (22), and completely inserting the stainless steel replacement rod into the original rod position of the fuel rod (6) to be replaced.

Description

Rod taking device and rod replacing method Technical Field The invention relates to the technical field of maintenance of new fuel assemblies of nuclear power stations, in particular to a rod taking device and a rod replacing method. Background At present, for preventing unexpected loss of new fuel assemblies, each unit has a certain number of new fuel assemblies, the domestic nuclear power station does not have equipment and technology for carrying out maintenance work of the new fuel assemblies in a factory, the domestic nuclear power station is in a blank state in the maintenance field of the new fuel assemblies, when defective fuel rods appear in the new fuel assemblies, the only solution is to pack the new fuel assemblies and return the new fuel assemblies to the factory for reassembling and maintenance, and the implementation of the scheme is long in process time consumption, high in cost and complex in implementation, and has the risk of secondary damage in the process of returning the fuel assemblies to the factory. Disclosure of Invention The invention aims to solve the technical problem of providing a rod taking device and a rod replacing method. The invention solves the technical problems by adopting the technical scheme that the rod taking device comprises a box body, a power unit, an execution unit and a control unit, wherein the power unit and the execution unit are arranged in the box body; The executing unit comprises a core rod, clamping jaws, a locking pipe and an outer sleeve, wherein the core rod, the clamping jaws and the locking pipe are arranged in the outer sleeve and can move along the axial direction of the outer sleeve, the locking pipe is sleeved on the core rod and the clamping jaws and can move along the axial direction of the core rod, two ends of the core rod are respectively connected with the power unit and the clamping jaws, and a pawl for grabbing a fuel rod to be replaced is arranged at one end of the clamping jaws, which is far away from the core rod. In the rod taking device, the power unit comprises a motor, a winding drum and a lifting rope, wherein the motor is connected with the winding drum, the winding drum is connected with the box body, and two ends of the lifting rope are respectively connected with the winding drum and the core rod. Preferably, in the rod taking device, the execution unit further comprises a balancing weight, the balancing weight is sleeved on the outer sleeve and can move along the axial direction of the outer sleeve, and the lifting rope is connected with the core rod through the balancing weight. Preferably, in the rod taking device, the balancing weight comprises an annular piece and a rib plate, the annular piece is sleeved on the outer peripheral wall of the outer sleeve, the rib plate sequentially penetrates through the annular piece and the outer sleeve along the radial direction of the annular piece, and two sides of the rib plate are respectively connected with the lifting rope and the core rod. Preferably, in the rod taking device of the present invention, the number of the lifting ropes is at least two, and the rib plate is provided with a first through hole, at least two second through holes and a first screw hole; The first through hole extends along the axial direction of the outer sleeve and is close to the power unit, the first screw hole is far away from the power unit and is used for being connected with the core rod, a gap is reserved between the first through hole and the first screw hole, at least two second through holes are respectively arranged on two sides of the gap, and the second through holes extend along the axial direction perpendicular to the outer sleeve; one end of each lifting rope sequentially passes through the first through hole and the corresponding second through hole and extends out of the rib plate; the balancing weight further comprises a pressing cover, wherein the pressing cover is connected with the rib plates and used for pressing one end, extending out of the rib plates, of each lifting rope. Preferably, in the rod extraction device according to the present invention, the core rod includes a body portion, a first thread segment, a second thread segment, and a third thread segment; The first thread section is arranged at one end part of the body part and inserted into the first screw hole for connection, the third thread section is arranged at the other end part of the body part and connected with the clamping jaw, and the second thread section is arranged between the first thread section and the third thread section and connected with the locking pipe. Preferably, in the rod taking device according to the present invention, the outer sleeve includes at least two strip-shaped members with a ring-shaped cross section, at least two strip-shaped members enclose the core rod, the clamping jaw and the locking tube, a strip-shaped channel is provided between two adjacent strip-shaped members, the stri