CN117401428A - Nuclear fuel assembly handling device and nuclear fuel assembly handling system - Google Patents

Abstract

The application provides a nuclear fuel assembly handling device and a nuclear fuel assembly handling system, wherein the nuclear fuel assembly handling device comprises a sleeve, a core bar, a limiting rod and a grabbing mechanism, and the sleeve comprises a cylinder body and a first limiting hole penetrating through the cylinder body; the core rod is arranged in the sleeve in a penetrating way and can reciprocate in the sleeve, and comprises a rod body, and a second limiting hole and a third limiting hole which penetrate through the rod body and are arranged at intervals; the limiting rod is used for limiting the displacement of the core rod relative to the sleeve, and is arranged in the first limiting hole and the second limiting hole in a penetrating manner or in the first limiting hole and the third limiting hole in a penetrating manner; the grabbing mechanism is arranged at one end of the core rod and used for clamping or releasing the nuclear fuel assembly along with the displacement of the core rod. The utility model provides a nuclear fuel assembly handling device and nuclear fuel assembly handling system can realize the remote automatic operation of fuel assembly handling process, improves fuel assembly's transport effect and conveying efficiency, reduces staff's working strength in the operation in-process, reduces the potential safety hazard.

Description

Nuclear fuel assembly handling device and nuclear fuel assembly handling system

Technical Field

The present disclosure relates to the field of nuclear fuel assembly handling, and more particularly, to a nuclear fuel assembly handling apparatus and a nuclear fuel assembly handling system.

Background

The nuclear fuel assembly handling device is used for loading and unloading the nuclear fuel assembly when the nuclear power plant reactor is charged or stopped for the first time, and transporting the nuclear fuel assembly between the reactor core and the transfer device. When the nuclear power station is in shutdown and refueling, the simulated fuel assembly is loaded through the nuclear fuel assembly carrying device, so that the simulated fuel assembly is in a vertical state, the simulated fuel assembly is lifted from the spent fuel pool to the bottom of a transmission pool of a fuel plant of the nuclear power station, the simulated fuel assembly is inserted into a fuel basket at the bottom of the transmission pool from top to bottom, and the transmission pool is in a non-water state during shutdown and refueling so as to facilitate working of staff.

In the related art, the conventional nuclear fuel assembly handling apparatus requires a worker to manually release the dummy fuel assembly after inserting the dummy fuel assembly into the fuel basket. Because the simulation fuel assembly has the risk of radioactive contamination after putting forward from the spent fuel pond, the staff need wear the special protection gas clothing of nuclear power station and get into the fuel transmission pond of 12 meters deep through the vertical ladder and carry out the operation of simulating fuel assembly dismantlement, and the fuel basket bottom is higher to the height on top, and after the simulation fuel assembly inserts, the staff need climb the top manual release simulation fuel assembly of fuel basket, leads to the whole loading and unloading operation flow of simulation fuel assembly complicated and working strength big, and the risk that radioactive contamination and personnel fall is higher, and the potential safety hazard is great.

Disclosure of Invention

Based on this, it is necessary to provide a nuclear fuel assembly handling device and a nuclear fuel assembly handling system, which aim to realize the remote automatic handling of the nuclear fuel assembly, improve the handling effect and the handling efficiency of the nuclear fuel assembly, reduce the working strength of staff in the handling process, and reduce the potential safety hazard.

An embodiment of a first aspect of the present application provides a nuclear fuel assembly handling device, including a sleeve, a core rod, a gripping mechanism, and a limiting rod, where the sleeve includes a barrel and a first limiting hole penetrating through the barrel, the barrel has a first central axis, the first limiting hole has a first axis, and the first axis intersects with the first central axis; the core rod is arranged in the sleeve in a penetrating manner, can reciprocate in the sleeve along the extending direction of the first central shaft, comprises a rod body, and a second limiting hole and a third limiting hole which penetrate through the rod body and are arranged at intervals, wherein the second limiting hole is provided with a second axis, the third limiting hole is provided with a third axis, and the second axis and the third axis are intersected with the first central shaft and are parallel to the first axis; the grabbing mechanism is arranged at one end of the core rod, the third limiting hole is arranged closer to the grabbing mechanism than the second limiting hole, and the grabbing mechanism is used for grabbing or releasing the nuclear fuel assembly along with the displacement of the core rod relative to the sleeve; the limiting rod extends along the extending direction of the first axis, the limiting rod is used for fixing the core rod and the sleeve, and the limiting rod penetrates through the first limiting hole and the second limiting hole or penetrates through the first limiting hole and the third limiting hole.

In this embodiment of the application, through penetrating and stretching out of control gag lever post in core bar and sleeve, inject the core bar and for telescopic removal displacement to realize snatching the automation of mechanism and snatch and release, realize nuclear fuel assembly handling device and nuclear fuel assembly's fixed and separation, realize nuclear fuel assembly's long-range automatic handling. Compared with manual operation, the remote automatic carrying of the nuclear fuel assembly is realized through the nuclear fuel assembly carrying device, the control mode is simple and convenient, the working strength of workers in the operation process can be reduced, the carrying efficiency of the nuclear fuel assembly is improved, the positioning accuracy and repeated positioning accuracy of the nuclear fuel assembly in the carrying process can also be improved, the stability and safety of the nuclear fuel assembly in the carrying and loading and unloading processes are improved, the carrying effect of the nuclear fuel assembly is improved, and the potential safety hazard in the carrying process is reduced. Secondly, can realize having the nuclear fuel assembly transport operation under the radioactive contamination risk environment through nuclear fuel assembly handling device, need not the staff self to reach the junction of nuclear fuel assembly handling device and nuclear fuel assembly and realize the fixed and the separation of nuclear fuel assembly handling device and nuclear fuel assembly, can reduce the radioactive contamination risk and the risk of falling that the staff bore in the handling, further improve the security of nuclear fuel assembly handling process.

In some embodiments, the nuclear fuel assembly handling device further includes a hanging ring, a fixing member, and a first elastic member, where the hanging ring is disposed on a side of the core rod away from the grabbing mechanism, and the core rod portion is disposed in the hanging ring in a penetrating manner; the fixing piece is arranged in the lifting ring and fixedly connected with the core rod, and the fixing piece is used for limiting the core rod to be separated from the lifting ring; and the first elastic piece is arranged between the fixing piece and the hanging ring and surrounds the core rod.

In some embodiments, the nuclear fuel assembly handling apparatus further includes a guide assembly including a guide cylinder and a connecting rope, the guide cylinder being fixedly connected with the outer wall of the sleeve, the guide cylinder extending along the extending direction of the first axis and communicating with the first limiting hole for the limiting rod to extend at least partially therein; one end of the connecting rope is used for penetrating through the guide cylinder and fixedly connecting with the limiting rod, and the other end of the connecting rope is used for extending out of the guide cylinder and fixedly arranging the connecting rope; the first axis and the first central axis form an included angle smaller than 90 degrees.

In some embodiments, the nuclear fuel assembly handling device further includes a guide assembly including a guide cylinder fixedly connected to an outer wall of the sleeve, a connecting rope, and a second elastic member, the guide cylinder extending along an extension direction of the first axis and communicating with the first limiting hole for at least partially extending the limiting rod therein; one end of the connecting rope is used for penetrating through the guide cylinder and fixedly connecting with the limiting rod, and the other end of the connecting rope is used for extending out of the guide cylinder and fixedly arranging the connecting rope; the second elastic piece is arranged in the guide cylinder along the first axis direction and surrounds the connecting rope, and is used for providing force towards the first limiting hole for the limiting rod.

In some embodiments, the guide assembly further comprises a support fixedly connected between the outer wall of the guide cylinder and the outer wall of the sleeve.

In some embodiments, the gripping mechanism comprises a housing, a control cylinder, and a jaw assembly, the housing being fixedly connected to the lower end of the sleeve; the control cylinder is positioned in the shell, the control cylinder is fixedly connected with the lower end of the core rod, and a protruding structure is arranged on the periphery of the lower end of the control cylinder; the clamping jaw assembly is arranged around the control cylinder, and one side, close to the core rod, of the clamping jaw assembly is at least partially positioned in the shell; the clamping jaw assembly comprises a plurality of clamping jaws which are uniformly and alternately arranged, a part between two ends of each clamping jaw is connected with the shell through a rotating shaft, the extending direction of the rotating shaft is perpendicular to the first central shaft, and a grapple is arranged on one side of the clamping jaw, which is far away from the core rod; the raised structure is for sliding abutment with an inner surface of the jaw assembly.

In some embodiments, the clamping jaw comprises a first part, a second part and a third part which are fixedly connected, the first part is arranged closer to the core rod than the second part and the third part, the second part and the third part are arranged at intervals along the circumferential direction of the control cylinder, the first part is connected with the shell through the rotating shaft, and the grapple is arranged on one side, away from the first part, of the second part and the third part.

In some embodiments, the nuclear fuel assembly handling apparatus further includes at least one guide pin fixedly coupled to the sleeve, the guide pin extending in a direction parallel to the first central axis.

In some embodiments, the guide pin has a second central axis parallel to the first central axis, and the guide pin includes a guide head rotatable about the second central axis, the guide head having an eccentric circular cross section in a cross section perpendicular to an extending direction of the first central axis.

Embodiments of the second aspect of the present application provide a nuclear fuel assembly handling system comprising a nuclear fuel assembly handling apparatus as described in any one of the preceding claims.

In the nuclear fuel assembly handling system that this application embodiment provided nuclear fuel assembly handling system includes, penetrating and stretching out in core bar and sleeve through control gag lever post, inject the core bar and for telescopic removal displacement to realize snatching the automation of mechanism snatch and release, realize the fixed and the separation of nuclear fuel assembly handling device and nuclear fuel assembly, realize the long-range automatic handling of nuclear fuel assembly. Compared with manual operation, the remote automatic carrying of the nuclear fuel assembly is realized through the nuclear fuel assembly carrying device, the control mode is simple and convenient, the working strength of workers in the operation process can be reduced, the carrying efficiency of the nuclear fuel assembly is improved, the positioning accuracy and repeated positioning accuracy of the nuclear fuel assembly in the carrying process can also be improved, the stability and safety of the nuclear fuel assembly in the carrying and loading and unloading processes are improved, the carrying effect of the nuclear fuel assembly is improved, and the potential safety hazard in the carrying process is reduced. Secondly, can realize having the nuclear fuel assembly transport operation under the radioactive contamination risk environment through nuclear fuel assembly handling device, need not the staff self to reach the junction of nuclear fuel assembly handling device and nuclear fuel assembly and realize handling device and nuclear fuel assembly's fixed and separation, can reduce the radioactive contamination risk and the risk of falling that the staff bore in the handling, further improve the security of nuclear fuel assembly handling process.

Drawings

FIG. 1 is a schematic diagram of a nuclear fuel assembly handling apparatus according to one embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of a nuclear fuel assembly handling apparatus in an embodiment of the present application;

FIG. 3 is a left side view of a nuclear fuel assembly handling apparatus in an embodiment of the present application;

FIG. 4 is a schematic structural view of a grabbing mechanism according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a guide pin according to an embodiment of the present application;

FIG. 6 is a cross-sectional view taken along the direction A-A in FIG. 5;

reference numerals: the nuclear fuel assembly handling device-100, a sleeve-1, a barrel-11, a first central shaft-110, a first limiting hole-12, a first axis-120, a core rod-2, a rod body-21, a second limiting hole-22, a third limiting hole-23, a limiting protrusion-24, a limiting rod-3, a grabbing mechanism-4, a shell-41, a control barrel-42, a protrusion structure-421, a clamping jaw assembly-43, a clamping jaw-431, a first part-4311, a second part-4312, a third part-4313, a clamping hook-432, a rotating shaft-433, a third elastic piece-44, a hanging ring-5, a fixing piece-6, a first elastic piece-7, a guiding assembly-8, a guiding barrel-81, a connecting rope-82, a second elastic piece-83, a supporting piece-9, a guiding pin-10 and a guiding head-101.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In describing positional relationships, when an element such as a layer, film or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present unless otherwise indicated. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more intervening elements may also be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening elements may also be present.

Where the terms "comprising," "having," and "including" are used herein, another component may also be added unless explicitly defined as such, e.g., "consisting of … …," etc. Unless mentioned to the contrary, singular terms may include plural and are not to be construed as being one in number.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.

It will be further understood that when interpreting an element, although not explicitly described, the element is intended to include the range of errors which should be within the acceptable limits of deviation from the particular values identified by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, and is not limited herein.

Further, in the specification, the phrase "planar distribution diagram" refers to the drawing when the target portion is viewed from above, and the phrase "cross-sectional diagram" refers to the drawing when the cross section taken by vertically cutting the target portion is viewed from the side.

Further, the drawings are not 1:1, and the relative dimensions of the various elements are drawn by way of example only in the drawings and are not necessarily drawn to true scale.

Based on the above-mentioned problem, this application provides a nuclear fuel assembly handling device and nuclear fuel assembly handling system, aims at realizing the long-range automatic handling of nuclear fuel assembly, improves nuclear fuel assembly's transport effect and conveying efficiency, reduces staff's working strength in handling, reduces the potential safety hazard.

The embodiment of the first aspect of the present application provides a nuclear fuel assembly handling apparatus 100, as shown in fig. 1 to 3, the nuclear fuel assembly handling apparatus 100 includes a sleeve 1, a core rod 2, a gripping mechanism 4, and a stopper rod 3, the sleeve 1 includes a barrel 11 and a first stopper hole 12 penetrating the barrel 11, the barrel 11 has a first central axis 110, the first stopper hole 12 has a first axis 120, the first axis 120 intersects with the first central axis 110, in other words, the sleeve 1 itself forms an internal hole penetrated at both ends in an axial direction, that is, in a direction parallel to the first central axis 110, and the first stopper hole 12 penetrates from an outer peripheral wall of the sleeve 1 to the other side of the barrel 1 in a direction oblique to the first central axis 110; the core rod 2 is arranged in the sleeve 1 in a penetrating way, the core rod 2 can axially reciprocate in the sleeve 1, the core rod 2 comprises a rod body 21, and a second limiting hole 22 and a third limiting hole 23 which penetrate through the rod body 21 and are arranged at intervals, the second limiting hole 22 is provided with a second axis, the third limiting hole 23 is provided with a third axis, and the second axis and the third axis are intersected with the first central shaft 110 and are parallel to the first axis 120; the grabbing mechanism 4 is arranged at one end of the core rod 2, the third limiting hole 23 is arranged closer to the grabbing mechanism 4 than the second limiting hole 22, and the grabbing mechanism 4 is used for grabbing or releasing the nuclear fuel assembly along with axial displacement of the core rod 2 relative to the sleeve 1; the stop lever 3 extends along the extending direction of the first axis 120, the stop lever 3 is used for fixing the core rod 2 and the sleeve 1, and the stop lever 3 is arranged in the first stop hole 12 and the second stop hole 22 in a penetrating manner or in the first stop hole 12 and the third stop hole 23 in a penetrating manner.

In this embodiment, as shown in fig. 2, the third limiting hole 23 is disposed closer to the grabbing mechanism 4 than the second limiting hole 22, that is, the third limiting hole 23 is disposed below the second limiting hole 22. Under the condition that the limiting rod 3 penetrates through the first limiting hole 12 and the second limiting hole 22, the grabbing mechanism 4 can grab the nuclear fuel assembly, so that the nuclear fuel assembly carrying device 100 is fixedly connected with the nuclear fuel assembly. The gripping mechanism 4 can release the nuclear fuel assembly with the stopper rod 3 penetrating the first stopper hole 12 and the third stopper hole 23, and the nuclear fuel assembly handling apparatus 100 is separated from the nuclear fuel assembly. The nuclear fuel assembly transport device 100 will be simply referred to as a transport device 100 hereinafter. In the process of connecting the carrying device 100 and the nuclear fuel assembly, firstly, the carrying device 100 is moved to the upper part of the nuclear fuel assembly to be aligned with the nuclear fuel assembly, at this time, the center of gravity of the nuclear fuel assembly is located on the extension line of the first central shaft 110 of the sleeve 1, the limiting rod 3 is arranged in the first limiting hole 12 and the third limiting hole 23 in a penetrating manner, the core rod 2 and the sleeve 1 are in a locking state, the core rod 2 is limited to be unable to generate displacement in the sleeve 1, the grabbing mechanism 4 is in a shrinking state, and the grabbing mechanism 4 is not blocked from extending into the nuclear fuel assembly.

In this embodiment, after the handling device 100 is in alignment contact with the nuclear fuel assembly, the sleeve 1 is fixed in position and does not change, the stop lever 3 is moved out of the first stop hole 12 and the third stop hole 23, so that the core rod 2 and the sleeve 1 are in an unlocking state, the core rod 2 is controlled to move downwards or the core rod 2 is controlled to move downwards under the action of gravity or other forces, so that the second stop hole 22 moves to a height position corresponding to the first stop hole 12, and the grabbing mechanism 4 is in an opening state under the driving of the core rod 2. And then the limiting rod 3 is penetrated into the first limiting hole 12 and the second limiting hole 22 again, so that the core rod 2 and the sleeve 1 are in a locking state again, the core rod 2 is limited and cannot generate displacement in the sleeve 1, the grabbing mechanism 4 is in an open state and is kept in an engaged state, so that the clamping state of the grabbing mechanism 4 and the nuclear fuel assembly is kept, the fixed connection of the nuclear fuel assembly and the carrying device 100 is completed, and the probability that the nuclear fuel assembly falls off from the carrying device 100 in the carrying process is reduced. When the crane drives the carrying device 100 to move, the nuclear fuel assembly can be synchronously driven to move.

In this embodiment, when the moving and carrying of the nuclear fuel assembly are completed and the carrying device 100 is required to be separated from the nuclear fuel assembly, the stop lever 3 is moved out of the first stop hole 12 and the second stop hole 22, so that the core rod 2 and the sleeve 1 are in an unlocking state, the core rod 2 is controlled to move upwards, the third stop hole 23 is moved to a height position corresponding to the first stop hole 12, the grabbing mechanism 4 is in a contracted state under the driving of the core rod 2 so as to be separated from the nuclear fuel assembly, then the stop lever 3 is threaded into the first stop hole 12 and the third stop hole 23 again, the core rod 2 and the sleeve 1 are in a locking state again, the core rod 2 is limited to be unable to generate displacement in the sleeve 1, the grabbing mechanism 4 is in and keeps in a contracted state, no obstruction is generated to the grabbing mechanism 4 extending out of the nuclear fuel assembly, and the nuclear fuel assembly cannot be accidentally carried in the continuous upward moving process of the crane driving the carrying device 100.

In this embodiment, through penetrating and moving out of remote control gag lever post 3 in core bar 2 and sleeve 1, inject the axial displacement of core bar 2 for sleeve 1 to realize snatching the automation of mechanism 4 snatch and release, realize handling device 100 and nuclear fuel assembly's fixed and separation, thereby realize nuclear fuel assembly's removal, installation and dismantlement, realize nuclear fuel assembly's long-range automatic handling. In this process, compare in manual operation, realize the long-range automatic handling of nuclear fuel assembly through handling device 100, control method is simple and convenient, can reduce staff's working strength in the operation in-process, improve nuclear fuel assembly's transport efficiency, can also improve nuclear fuel assembly's positioning accuracy and repeated positioning accuracy in the transport, improve nuclear fuel assembly's stability and security in transport and loading and unloading in-process, improve nuclear fuel assembly's transport effect, reduce the potential safety hazard in the transport. Secondly, can be with nuclear fuel assembly safety removal and release the fuel basket at the bottom of the transmission water tank of nuclear power station fuel factory building through handling device 100, realize having the nuclear fuel assembly transport operation under the radioactive contamination risk environment, the fixed and the separation of handling device 100 and nuclear fuel assembly are realized to the junction that does not need staff self to reach handling device 100 and nuclear fuel assembly, can reduce the radioactive contamination risk that the staff bore in handling and fall risk, further improve the security of nuclear fuel assembly handling process.

Alternatively, as shown in fig. 2, when the stop lever 3 is disposed through the first stop hole 12 and the second stop hole 22, or is disposed through the first stop hole 12 and the third stop hole 23, the stop lever 3 at least partially extends out of the first stop hole 12, preferably at an end below. From this, whether staff's accessible observation gag lever post 3 at least partially stretches out first spacing hole 12, judges that gag lever post 3 is fixed in place to guarantee that the locking of core bar 2 and sleeve 1 is reliable, guarantee the security and the reliability of handling device 100 transport nuclear fuel assembly, and judge that the standard is simple and easy clear, can reduce staff's the work degree of difficulty, improve handling efficiency. Specifically, in the transportation project of the simulated nuclear fuel assembly for the refueling overhaul of the nuclear power plant, after the carrying device 100 is applied, the operation of a fuel transmission pool under special protective equipment worn by a worker can be canceled, and the overhaul period is shortened by more than 4 hours.

In the handling process of the nuclear fuel assembly, the core rod 2 is not only used for controlling the expansion and contraction of the grabbing mechanism 4, but also used for bearing the pressure applied by the nuclear fuel assembly together with the sleeve 1 and the grabbing mechanism 4, and the safety load of the sleeve 1, the core rod 2 and the grabbing mechanism 4 is more than or equal to three times of the gravity of the nuclear fuel assembly so as to ensure the safety and stability of the nuclear fuel assembly in the handling process and meet the special requirements of a lifting appliance of the nuclear fuel assembly. Specifically, the bearing force of the core rod 2 is greater than or equal to 1300 kg. The handling device 100 provided by the embodiment of the application can be further applied to an underwater area of a nuclear power station, and is capable of remotely grabbing, releasing and hoisting an underwater nuclear fuel assembly, so that the handling device has a large application range.

In some embodiments, as shown in fig. 1 to 3, the nuclear fuel assembly handling apparatus 100 further includes a hanging ring 5 and a fixing member 6, where the hanging ring 5 is disposed on a side of the core rod 2 away from the gripping mechanism 4. Optionally, the core rod 2 at least partially penetrates through the lifting ring 5, the fixing piece 6 is disposed in the lifting ring 5 and fixedly connected with the core rod 2, and the fixing piece 6 is used for limiting the core rod 2 to deviate from the lifting ring 5.

In one embodiment, the nuclear fuel assembly handling apparatus 100 further includes a first elastic member 7, where the first elastic member 7 is disposed between the fixing member 6 and the suspension ring 5 along the axial direction, and is sleeved on the core rod 2. The hanging ring 5 is used for being connected with a crane in the nuclear power station, and the upper end of the hanging ring 5 is arc-shaped, so that the crane is convenient to hoist. The first elastic member 7 includes, but is not limited to, a spring. The fixing piece 6 is in threaded connection and/or pin connection with the core rod 2, so that the connection stability and the disassembly and assembly convenience of the fixing piece 6 and the core rod 2 are guaranteed, the first elastic piece 7 is better fixed, the spring can be replaced by disassembling the fixing piece 6, and the replacement mode is simple and reliable.

In the embodiment of the application, in the process of lifting the nuclear fuel assembly, the handling device 100 is required to enable the new nuclear fuel assembly to keep upward pulling force of not more than 250 kg before the support frame is released, so that the new nuclear fuel assembly is kept in a vertical state all the time, and the transportation safety of the nuclear fuel assembly is ensured. The fixing member 6 and the first elastic member 7 may form a mechanical buffer structure, and provide pre-tightening force protection for the nuclear fuel assembly during the transporting process of the nuclear fuel assembly, so that the transporting device 100 has an automatic tension buffer. Specifically, the first elastic piece 7 is arranged between the fixing piece 6 and the lifting ring 5 along the axial direction, and is sleeved on the core bar 2, the first elastic piece 7 can buffer the impact force between the lifting ring 5 and the core bar 2 which are directly connected with the crane in the process of switching the click stroke of the crane, the impact force in the process of clicking the crane is reduced, the risk that the pulling force provided by the handling device for the nuclear fuel assembly exceeds the limit is reduced due to the factors such as the speed of the crane, the click response speed of the operation button box, the operation skill of the personnel and the like, the probability of damage of the nuclear fuel assembly caused by the exceeding of the pulling force is reduced, the operation risk of the personnel is reduced, and the safety and the stability of the handling process of the nuclear fuel assembly are improved.

Optionally, as shown in fig. 1 and fig. 2, the core rod 2 is further provided with a limiting protrusion 24, and the limiting protrusion 24 is located between the hanging ring 5 and the sleeve 1, so as to limit the maximum displacement of the core rod 2 in the handling process, and ensure the safety and stability of the nuclear fuel assembly in the handling process.

In some embodiments, as shown in fig. 1 and 2, the first axis 120 is disposed obliquely with respect to the first central axis 110, and an angle between the first axis 120 and the first central axis 110 is smaller than 90 °, so that the stop lever 3 can penetrate into or out of the first stop hole 12, the second stop hole 22, and the third stop hole 23. When the limiting rod 3 penetrates, the limiting rod 3 can enter the first limiting hole 12, the second limiting hole 22 or the third limiting hole 23 by means of self gravity, automatic alignment of the limiting rod 3 is achieved, and conveying efficiency of the conveying device 100 is improved.

In some embodiments, as shown in fig. 1 and 2, the nuclear fuel assembly handling apparatus 100 further includes a guide assembly 8, the guide assembly 8 includes a guide cylinder 81 and a connection rope 82, the guide cylinder 81 extends along the extending direction of the first axis 120, the guide cylinder 81 is fixedly connected with the outer wall of the sleeve 1 and is communicated with the upper end of the first limiting hole 12, the inner space of the guide cylinder 81 is used for guiding the limiting rod 3 to enter into the first limiting hole 12, one end of the connection rope 82 is used for penetrating into the guide cylinder 81 and is fixedly connected with the upper end of the limiting rod 3, the other end of the connection rope extends out of the guide cylinder 81, and an operator connects one end extending out of the guide cylinder 81 with a pool side of the nuclear power station or the like for fixing a safe position; the angle between the first axis 120 and the first central axis 110 is less than 90 °.

In this embodiment of the present application, the guiding cylinder 81 extends along the extending direction of the first axis 120, the extending direction of the guiding cylinder 81 is the same as the extending direction of the first limiting hole 12 and the limiting rod 3, the guiding cylinder 81 is used for providing a moving space for the limiting rod 3, so as to define the moving direction and the moving displacement of the limiting rod 3, and ensure the convenience of locking the sleeve 1 and the core rod 2. The connecting rope 82 is used for assisting a worker in remotely controlling penetration and extension of the limiting rod 3, specifically, the worker can pull the connecting rope 82 on the side of a pool of the nuclear power station, so that the limiting rod 3 moves out of the first limiting hole 12, the second limiting hole 22 or the third limiting hole 23 upwards, the limiting rod 3 is arranged in the guide cylinder 81, and the core rod 2 and the sleeve 1 are in an unlocking state. The staff can also release the connecting rope 82 on the side of the nuclear power station pool, the included angle between the first axis 120 and the first central shaft 110 is smaller than 90 degrees, so that the limiting rod 3 which is arranged in an upward inclined way stretches into the first limiting hole 12, the second limiting hole 22 or the third limiting hole 23 again along the direction of the first axis 120 under the action of self gravity, and the core rod 2 and the sleeve 1 are in a locking state. Through connecting rope 82 remote control gag lever post 3 removal to the operating condition of control handling device 100, the control mode is simple convenient, can reduce staff's working strength in the operation process, improves nuclear fuel assembly's transport efficiency, reduces the radioactive contamination risk and the risk of falling that the staff bore in the operation process.

In some embodiments, as shown in fig. 2, the guide assembly 8 includes a guide cylinder 81, a connecting rope 82 and a second elastic member 83, the guide cylinder 81 extends along the extending direction of the first axis 120, the guide cylinder 81 is fixedly connected with the outer wall of the sleeve 1 and is communicated with the upper end of the first limiting hole 12, the inner space of the guide cylinder 81 is used for guiding the limiting rod 3 to enter into the first limiting hole 12, one end of the connecting rope 82 is used for penetrating into the guide cylinder 81 and is fixedly connected with the upper end of the limiting rod 3, and the other end extends out of the guide cylinder 81; the second elastic member 83 is disposed in the guide cylinder 81 along the first axis 120 and around the connection rope 82 for providing a force to the stopper rod 3 toward the first stopper hole 12.

In this embodiment, the second elastic member 83 is used for assisting the staff to control the connecting rope 82 more simply and laborsaving, so as to control the penetration and extension of the stop lever 3 more simply and laborsaving. Specifically, the first axis 120 is perpendicular to the first central shaft 110, the guide cylinder 81 and the sleeve 1 are perpendicular to each other, a worker can pull the connecting rope 82 on the side of the pool of the nuclear power station, and the connecting rope 82 drives the stop lever 3 to move in the guide cylinder 81 and compress the second elastic piece 83, so that the stop lever 3 extends out of the first stop hole 12, the second stop hole 22 or the third stop hole 23, and the core rod 2 and the sleeve 1 are in an unlocking state. The worker can also release the connecting rope 82 on the side of the pool of the nuclear power station, the second elastic element 83 rebounds, and the limit rod 3 stretches into the first limit hole 12, the second limit hole 22 or the third limit hole 23 again along the extending direction of the first axis 120 under the action of the elastic force provided by the second elastic element 83, so that the core rod 2 and the sleeve 1 are in a locking state.

In this embodiment, when the guide assembly 8 includes the second elastic member 83, the first axis 120 may be disposed obliquely with respect to the first central axis 110, or may be disposed perpendicularly, and an included angle between the first axis 120 and the first central axis 110 may be smaller than 90 °, or may be greater than or equal to 90 °, and may be disposed according to actual requirements, for example, according to space arrangement in the nuclear power plant, which is not limited in this application. The second elastic member 83 includes, but is not limited to, a spring.

In some embodiments, as shown in fig. 1 and 2, the guide assembly 8 further comprises a support 9, the support 9 being fixedly connected between the outer wall of the guide cylinder 81 and the outer wall of the sleeve 1. When the first axis 120 is inclined with respect to the first central axis 110, the support 9 is triangular; when the first axis 120 is perpendicular to the first central axis 110, the supporting element 9 is rectangular, and at this time, the supporting element 9 may be disposed on a side of the guiding cylinder 81 near the hanging ring 5, or may be disposed on a side of the guiding cylinder 81 near the grabbing mechanism 4. The support 9 is used for fixing the guide cylinder 81 and the sleeve 1, improving the connection stability of the guide cylinder 81 and the sleeve 1, and improving the reliability of the conveying device 100.

In some embodiments, as shown in fig. 1 to 4, the gripping mechanism 4 comprises a housing 41, a control cylinder 42 and a jaw assembly 43, the housing 41 being fixedly connected to the lower end of the sleeve 1; the control cylinder 42 is positioned in the shell 41, the control cylinder 42 is fixedly connected with the lower end of the core rod 2, and the periphery of the lower end of the control cylinder 42 is provided with a convex structure 421; the clamping jaw assembly 43 is arranged around the control cylinder 42, and one side of the clamping jaw assembly 43, which is close to the core rod 2, is at least partially positioned in the shell 41; the clamping jaw assembly 43 comprises a plurality of clamping jaws 431 which are uniformly and alternately arranged, wherein a part between two ends of each clamping jaw 431 is connected with the shell 41 through a rotating shaft 433, the extending direction of the rotating shaft 433 is vertical to the first central shaft 110, namely, the rotating shaft 433 is horizontal, one side of the clamping jaw 431 away from the core rod 2 is provided with a grabbing hook 432, and the grabbing hook 432 is bent towards a direction away from the first central shaft 110, namely, outwards; the boss 421 is adapted to slidably abut an inner surface of the jaw assembly 431.

In this embodiment of the present application, the clamping jaw assembly 43 includes a plurality of clamping jaws 431 that even and interval set up, specifically, as shown in fig. 1 to 4, the clamping jaw assembly 43 includes four clamping jaws 431 that even and interval set up, and four clamping jaws 431 can guarantee that nuclear fuel assembly atress is balanced in the handling, improves nuclear fuel assembly's stability in the handling, improves the handling effect. The inner surface of the jaw 431 is inclined, and the jaw 431 includes an upper portion located above the rotation shaft 433 and a lower portion located below the rotation shaft 433. Before the grabbing mechanism 4 is connected and clamped with the nuclear fuel assembly, the grabbing mechanism 4 is in a contracted state, the control cylinder 42 is located above the clamping jaw 431, the protruding structure 421 is abutted to the inner surface of the upper portion of the clamping jaw 431, and the lower portion of the clamping jaw 431 deflects to be folded along the direction close to the first central shaft 110, so that the clamping jaw 431 can extend into the nuclear fuel assembly unhindered.

In this embodiment, when the grabbing mechanism 4 grabs the nuclear fuel assembly, after the grabbing mechanism 4 stretches into the nuclear fuel assembly, the core rod 2 moves downwards, the control cylinder 42 is fixedly connected with the core rod 2, the core rod 2 drives the control cylinder 42 to move downwards, the protruding structure 421 moves downwards until being abutted with the inner surface of the lower portion of the grabbing jaw 431, the lower portion of the grabbing jaw 431 moves in the direction away from the first central shaft 110 under the action of the protruding structure 421, namely deflects outwards, the grabbing mechanism 4 is in an open state, and the grabbing hook 432 located at the tail end of the lower portion of the grabbing jaw 431 is abutted and clamped with the nuclear fuel assembly, so that the handling device 100 and the nuclear fuel assembly are fixed. When the grabbing mechanism 4 needs to release the nuclear fuel assembly, the core rod 2 moves upwards to drive the control cylinder 42 to synchronously move upwards, the protruding structure 421 moves upwards to be abutted with the inner surface of the upper portion of the clamping jaw 431, the lower inner surface of the clamping jaw 431 is not acted on any more, the upper portion of the clamping jaw 431 deflects outwards under the action of the protruding structure 421, and correspondingly, the lower portion of the clamping jaw 431 deflects inwards, the grabbing mechanism 4 is in a telescopic state again, and the clamping jaw 431 can move out of the nuclear fuel assembly unhindered, so that the separation of the carrying device 100 and the nuclear fuel assembly is realized.

In some embodiments, as shown in fig. 2, the nuclear fuel assembly handling device further includes a third elastic member 44, the third elastic member 44 is disposed in the sleeve 1 along the direction of the first central axis 110, and the third elastic member 44 is sleeved at one end of the core rod 2 near the grabbing mechanism 4, one end of the third elastic member 44 is fixedly connected with the core rod 2, and the other end of the third elastic member is fixedly connected with the housing 41, so as to buffer the impact force applied to the sleeve 1 by the core rod 2 during the moving process, so that the rising and falling of the core rod 2 are more stable, thereby improving the stability of grabbing or releasing the nuclear fuel assembly by the grabbing mechanism 4 connected with the core rod 2, improving the stability of handling the nuclear fuel assembly by the handling device 100, and improving the handling effect. The third resilient member 44 includes, but is not limited to, a spring.

In some embodiments, as shown in fig. 1 to 4, the clamping jaw 431 includes a first portion 4311, a second portion 4312 and a third portion 4313 that are fixedly connected, the first portion 4311 is disposed closer to the core rod 2 than the second portion 4312 and the third portion 4313, the second portion 4312 and the third portion 4313 are disposed at intervals along the circumference of the control barrel 42, the first portion 4311 is connected to the housing 41 through a rotation shaft 433, and the catch 432 is disposed on a side of the second portion 4312 and the third portion 4313 away from the first portion 4311. When the grabbing mechanism 4 grabs the nuclear fuel assembly, the grabbing hooks 432 on the second part 4312 and the third part 4313 are simultaneously connected with the nuclear fuel assembly, so that the pressure applied to the clamping jaw 431 by the nuclear fuel assembly in the carrying process can be shared, the nuclear fuel assembly is balanced in stress in the carrying process, the grabbing of the grabbing mechanism 4 is stable, the stability of the carrying device 100 for carrying the nuclear fuel assembly is improved, and the carrying effect is improved.

In some embodiments, the sleeve 1 comprises a housing 41, the housing 41 being part of the sleeve 1, and the nuclear fuel assembly handling apparatus 100 further comprises at least one guide pin 10 connected to the sleeve 1. Alternatively, as shown in fig. 1 to 4, the sleeve 1 and the housing 41 are fixedly connected, and at least one guide pin 10 is connected to the housing 41. The guide pin 10 extends downwards along the direction parallel to the first central shaft 110, the guide pin 10 is used for being in alignment connection with the nuclear fuel assembly, guiding and auxiliary positioning are performed for alignment connection of the handling device 100 and the nuclear fuel assembly, centering and rigid connection of the grabbing mechanism 4 and the nuclear fuel assembly are achieved, accuracy of alignment connection of the handling device 100 and the nuclear fuel assembly is improved, the nuclear fuel assembly is guaranteed to be in an overall vertical state when lifted out, and handling effect and handling efficiency of the nuclear fuel assembly are improved.

Optionally, the handling device 100 includes two guide pins 10 disposed opposite to each other, or four guide pins 10 disposed uniformly, so as to further improve the accuracy and stability of the alignment connection between the handling device 100 and the nuclear fuel assembly. Of course, the number of the guide pins 10 may be two or three, and may be set according to actual requirements, which is not limited in this application.

In some embodiments, as shown in fig. 5 and 6, the guide pin 10 has a second central axis parallel to the first central axis 110, the guide pin 10 includes a guide head 101, the guide head 10 is rotatable around the second central axis, and the guide head 101 has an eccentric circular shape in cross section perpendicular to the extending direction of the first central axis 110. When the handling device 100 is not adjustable due to arrangement and fixation of an operation table in a factory building, the vertical height of a transport container and a nuclear fuel assembly is not coordinated with the height arm length of an operator, the nuclear fuel assembly protective plastic sleeve shields the sight of the operator, and the like, in the centering process of the gripping device and the nuclear fuel assembly, the gripping device is difficult to center in place with the nuclear fuel assembly once, and when the gripping mechanism 4 is blocked with an upper tube seat of the nuclear fuel assembly due to the misalignment, the eccentric circular guide pin 10 can be rapidly separated from the fuel assembly by rotating around the second central shaft, so that the alignment is performed again, the safety of the fuel assembly in the loading and unloading process is ensured, and the probability of damage to the gripping mechanism 4 or the nuclear fuel assembly due to the blocking of the gripping mechanism 4 and the upper tube seat of the nuclear fuel assembly is reduced.

Embodiments of the second aspect of the present application provide a nuclear fuel assembly handling system comprising a nuclear fuel assembly handling apparatus 100 as described in any one of the above.

In the nuclear fuel assembly handling device 100 included in the nuclear fuel assembly handling system provided by the embodiment of the application, as shown in fig. 1 to 4, the core rod 2 is limited to move and displace relative to the sleeve 1 by penetrating and extending the remote control limiting rod 3 into the core rod 2 and the sleeve 1, so as to realize automatic grabbing and releasing of the grabbing mechanism 4, realize fixing and separating of the handling device 100 and the nuclear fuel assembly, and realize remote automatic handling of the nuclear fuel assembly. Compared with manual operation, the remote automatic carrying of the nuclear fuel assembly is realized through the carrying device 100 device, the control mode is simple and convenient, the working strength of workers in the operation process can be reduced, the carrying efficiency of the nuclear fuel assembly is improved, the positioning accuracy and the repeated positioning accuracy of the nuclear fuel assembly in the carrying process can also be improved, the stability and the safety of the nuclear fuel assembly in the carrying and loading and unloading processes are improved, the carrying effect of the nuclear fuel assembly is improved, and the potential safety hazard in the carrying process is reduced. Secondly, can realize having the nuclear fuel assembly transport operation under the radioactive contamination risk environment through handling device 100, need not the staff self to reach the junction of handling device 100 and nuclear fuel assembly and realize the fixed and the separation of handling device 100 and nuclear fuel assembly, can reduce the radioactive contamination risk that the staff bore in handling and fall the risk, further improve the security of nuclear fuel assembly handling.

In some embodiments, the nuclear fuel assembly handling system further includes a transfer device and a controller, wherein the transfer device is fixedly connected with the handling device 100 to drive the handling device 100 to move in different directions, thereby realizing movement and loading and unloading of the nuclear fuel assembly. The transfer device comprises a crane. The controller is used for controlling the moving direction and the moving displacement of the transferring device, thereby controlling the moving direction and the moving displacement of the carrying device 100. Controllers include, but are not limited to, PLCs (programmable logic controllers, programmable Logic Controller) and industrial computers.

In some embodiments, the nuclear fuel assembly handling system further includes a mechanical tension meter mounted on the handling device 100 for measuring the tension force born by the handling device 100, so that a worker can observe the tension force born by the handling device 100 in real time, and stability and safety of handling the nuclear fuel assembly by the handling device 100 are improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A nuclear fuel assembly handling apparatus, comprising:

the sleeve comprises a barrel body and a first limiting hole penetrating through the barrel body, wherein the barrel body is provided with a first central shaft, the first limiting hole is provided with a first axis, and the first axis and the first central shaft are intersected;

the core rod is arranged in the sleeve in a penetrating manner and can reciprocate in the sleeve along the extending direction of the first central shaft, the core rod comprises a rod body, a second limiting hole and a third limiting hole, the second limiting hole and the third limiting hole penetrate through the rod body and are arranged at intervals, the second limiting hole is provided with a second axis, the third limiting hole is provided with a third axis, and the second axis and the third axis are intersected with the first central shaft and are parallel to the first axis;

The grabbing mechanism is arranged at one end of the core rod, the third limiting hole is arranged closer to the grabbing mechanism than the second limiting hole, and the grabbing mechanism is used for grabbing or releasing the nuclear fuel assembly along with the displacement of the core rod relative to the sleeve;

the limiting rod extends along the extending direction of the first axis, the limiting rod is used for fixing the core rod and the sleeve, and the limiting rod penetrates through the first limiting hole and the second limiting hole or penetrates through the first limiting hole and the third limiting hole.

2. The nuclear fuel assembly handling apparatus of claim 1, further comprising:

the hanging ring is arranged at one side of the core rod, which is far away from the grabbing mechanism, and the core rod part penetrates through the hanging ring; and

the fixing piece is arranged in the lifting ring and fixedly connected with the core rod, and the fixing piece is used for limiting the core rod to be separated from the lifting ring; and

the first elastic piece is arranged between the fixing piece and the hanging ring and surrounds the core rod.

3. The nuclear fuel assembly handling apparatus of claim 1, further comprising a guide assembly, the guide assembly comprising:

The guide cylinder is fixedly connected with the outer wall of the sleeve, extends along the extending direction of the first axis, is communicated with the first limiting hole and is used for at least partially extending the limiting rod into the first limiting hole;

one end of the connecting rope is used for penetrating through the guide cylinder and fixedly connecting with the limiting rod, and the other end of the connecting rope is used for extending out of the guide cylinder and fixedly arranging;

the first axis and the first central axis form an included angle smaller than 90 degrees.

4. The nuclear fuel assembly handling apparatus of claim 1, further comprising a guide assembly, the guide assembly comprising:

the guide cylinder is fixedly connected with the outer wall of the sleeve, extends along the extending direction of the first axis, is communicated with the first limiting hole and is used for at least partially extending the limiting rod into the first limiting hole;

one end of the connecting rope is used for penetrating through the guide cylinder and fixedly connecting with the limiting rod, and the other end of the connecting rope is used for extending out of the guide cylinder and fixedly arranging;

the second elastic piece is arranged in the guide cylinder along the first axis direction and surrounds the connecting rope, and is used for providing force towards the first limiting hole for the limiting rod.

5. The nuclear fuel assembly handling apparatus of claim 3 or 4, wherein the guide assembly further comprises a support fixedly connected between an outer wall of the guide cylinder and an outer wall of the sleeve.

6. The nuclear fuel assembly handling apparatus of claim 1, wherein the gripping mechanism comprises:

the shell is fixedly connected with the lower end of the sleeve;

the control cylinder is positioned in the shell, the control cylinder is fixedly connected with the lower end of the core rod, and a protruding structure is arranged on the periphery of the lower end of the control cylinder;

the clamping jaw assembly is arranged around the control cylinder, and one side, close to the core rod, of the clamping jaw assembly is at least partially positioned in the shell; the clamping jaw assembly comprises a plurality of clamping jaws which are uniformly and alternately arranged, a part between two ends of each clamping jaw is connected with the shell through a rotating shaft, the extending direction of the rotating shaft is perpendicular to the first central shaft, and a grapple is arranged on one side of the clamping jaw, which is far away from the core rod; the raised structure is for sliding abutment with an inner surface of the jaw assembly.

7. The nuclear fuel assembly handling apparatus of claim 6, wherein the clamping jaw includes fixedly connected first, second and third portions, the first portion being disposed closer to the stem than the second and third portions, the second and third portions being disposed at circumferentially spaced intervals along the control barrel, the first portion being connected to the housing through the rotational axis, the grapple being disposed on a side of the second and third portions remote from the first portion.

8. The nuclear fuel assembly handling apparatus of any one of claims 1 to 7, further comprising at least one guide pin fixedly connected to the sleeve, the guide pin extending in a direction parallel to the first central axis.

9. The nuclear fuel assembly handling apparatus of claim 8, wherein the guide pin has a second central axis parallel to the first central axis, the guide pin includes a guide head rotatable about the second central axis, and the guide head has an eccentric circular cross section perpendicular to an extending direction of the first central axis.

10. A nuclear fuel assembly handling system comprising a nuclear fuel assembly handling apparatus as claimed in any one of claims 1 to 9.