CN215341974U - Long-distance operation short-handle tool for nuclear fuel assembly - Google Patents

Long-distance operation short-handle tool for nuclear fuel assembly Download PDF

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Publication number
CN215341974U
CN215341974U CN202121101937.XU CN202121101937U CN215341974U CN 215341974 U CN215341974 U CN 215341974U CN 202121101937 U CN202121101937 U CN 202121101937U CN 215341974 U CN215341974 U CN 215341974U
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China
Prior art keywords
unlocking
fuel assembly
groove
pipe body
hollow pipe
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Active
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CN202121101937.XU
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Chinese (zh)
Inventor
粟彬
***
龙建辉
马清
周鑫
曾海舰
刘刚
郑传栋
丁慧民
薛胤
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China General Nuclear Power Corp
China Nuclear Power Technology Research Institute Co Ltd
CGN Power Co Ltd
China Nuclear Power Operation Co Ltd
China Nuclear Power Institute Co Ltd
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China General Nuclear Power Corp
China Nuclear Power Technology Research Institute Co Ltd
CGN Power Co Ltd
China Nuclear Power Operation Co Ltd
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Application filed by China General Nuclear Power Corp, China Nuclear Power Technology Research Institute Co Ltd, CGN Power Co Ltd, China Nuclear Power Operation Co Ltd filed Critical China General Nuclear Power Corp
Priority to CN202121101937.XU priority Critical patent/CN215341974U/en
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Publication of CN215341974U publication Critical patent/CN215341974U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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Abstract

The utility model relates to a long-distance operation short handle tool for a nuclear fuel assembly, which comprises an actuating mechanism for taking and placing the fuel assembly, wherein the actuating mechanism comprises a first hollow pipe body, a core rod and a clamping jaw mechanism; the clamping jaw mechanism is engaged or loosened along with the displacement of the core bar, and a rotary operation assembly capable of controlling the releasing time of the fuel assembly is arranged at the top end of the first hollow pipe body; the rotary operation assembly comprises a rotatable unlocking pin, an unlocking pull rod and a control piece, wherein the unlocking pull rod synchronously rotates with the unlocking pin, and the control piece drives the unlocking pull rod to rotate; the first hollow pipe body is also internally provided with a resetting mechanism for resetting the core rod from a lower position state to an upper position state; can realize long-range operation of loosening fuel assembly to make the staff cancel the pond operation of going down, avoid the risk that the operation brought, still possess the function of auto-lock, prevent that fuel assembly from taking off in the transportation.

Description

Long-distance operation short-handle tool for nuclear fuel assembly
Technical Field
The utility model relates to a gripping apparatus, in particular to a long-distance operation short-handle tool for a nuclear fuel assembly.
Background
When the nuclear power plant carries out dry state inspection and function test on the refueling machine and the transmission system at every time, the simulation fuel assembly stored in the spent fuel pool needs to be transferred into a fuel basket in the transmission system of the transmission pool for storage. And accomplish this operation, use the short handle instrument of current manual operation fuel assembly to snatch the fuel assembly, climb to the fuel basket top that highly is more than four meters from the transmission pond bottom, manually carry out the fuel assembly again and loosen the operation, whole operation process is very dangerous and examines staff's ability.
The space of the transmission pool is narrow, and even if the falling protector is hung on a worker, the risk of air leakage caused by damage of the gas clothes and injury of the worker still exists. Moreover, the personnel that relate to of this work still need consume the development of a large amount of manpower support work simultaneously to unexpected risks such as pollution risk, external exposure dose risk, altitude climbing operation risk and personnel injury in the pond down.
In addition, the operation of the fuel assembly is carried out under water, and there is a certain deformation of the fuel assembly during its combustion, with a certain amount of variation in both height and horizontal position. Therefore, the centering performance, the gripping ability, the structural strength and the self-locking function of the gripper are important to ensure safe, reliable, flexible and accurate operation and correct gripping of the fuel assembly.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to solve the problem that the existing manual operation fuel assembly short handle tool needs to be manually operated in a severe environment.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a long-distance operation short handle tool for a nuclear fuel assembly comprises an actuating mechanism for taking and placing the fuel assembly, wherein the actuating mechanism comprises a first hollow pipe body and a clamping jaw mechanism connected to the lower end of the first hollow pipe body; a core bar capable of axially reciprocating is arranged in the first hollow pipe body, and the clamping jaw mechanism is engaged with or released from the fuel assembly along with the displacement of the core bar;
a rotary operation assembly capable of controlling the releasing time of the fuel assembly is arranged at the top end of the first hollow pipe body; the rotary operating assembly mechanism comprises a rotatable unlocking pin, an unlocking pull rod and a control piece, wherein the unlocking pull rod synchronously rotates with the unlocking pin, and the control piece drives the unlocking pull rod to rotate; the side wall of the middle part of the unlocking pin is inwards sunken to form an unlocking groove, and the middle part of the unlocking groove is provided with an unlocking through hole which radially penetrates through the side wall of the unlocking groove;
the first hollow pipe body is also internally provided with a resetting mechanism which restores the core rod from a lower position to an upper position when no external pressure is applied;
the upper end of the core rod is provided with an extension piece bolt piece which is matched with the unlocking pin and is fixedly connected with the upper end of the core rod, the bolt piece can be abutted against the bottom side wall of the unlocking groove to limit the displacement of the core rod, or the bolt piece penetrates through the unlocking groove under the matching of the unlocking pull rod and the reset mechanism to enable the core rod to be displaced.
Preferably, a second hollow pipe body is sleeved on the upper part of the periphery of the first hollow pipe body; the unlocking pin radially penetrates through the upper end of the second hollow pipe body, and two ends of the unlocking pin extend out of the circumferential side wall of the second hollow pipe body to be fixedly connected with the unlocking pull rod and are matched with the unlocking pull rod to rotate synchronously; the lower end of the second hollow pipe body is connected with the clamping jaw mechanism;
and a movable space for the extension bolt piece to extend out is reserved in the second hollow pipe body above the unlocking pin.
Preferably, the circumferential side surfaces of the first hollow pipe body and the second hollow pipe body are respectively provided with a first opening and a second opening, and the extension piece bolt piece is provided with an operating hand lever which extends out of the first opening and the second opening along the radial direction of the extension piece bolt piece; the operating handle drives and controls the core rod to axially reciprocate.
Preferably, the jaw mechanism comprises a finger hook; the lower end of the core rod is provided with a control sleeve for controlling the finger-shaped hook to open and close; the control sleeve moves downwards to abut against and drive the finger-shaped hook to complete meshing work.
Preferably, the reset mechanism comprises a spring part and a spring pin shaft arranged in the spring part in a penetrating way; the bolt piece is provided with a radially extending protruding part, a fixing plate is arranged below the spring in the first hollow tube body, the lower end part of the spring pin shaft penetrates through the fixing plate, and the top end of the spring pin shaft is fixedly connected with the protruding part of the bolt piece;
and when the core rod is in a lower position, the fixing plate is abutted against and compresses the spring piece.
Preferably, the lower end of the second hollow pipe body is provided with a gravity interlocking mechanism for limiting the movement of the control sleeve.
Preferably, the gravity interlocking mechanism comprises a locking sleeve which is sleeved outside the control sleeve and can axially displace relative to the control sleeve, a first interlocking plate arranged on the inner wall of the locking sleeve and a locking roller; a second interlocking plate matched with the first interlocking plate is also arranged on the outer wall of the control sleeve; the locking roller is movably connected between the first interlocking plate and the second interlocking plate;
the first interlocking plate is provided with a first concave groove at the upper part of the first side surface, and a first boss at the lower part; a second groove is formed in the upper portion, facing the second side face of the first side face, of the second interlocking plate, a third groove is formed in the lower portion of the second interlocking plate, and a second boss is formed between the second groove and the third groove;
the locking sleeve is in an upper state, the first groove is staggered relative to the second groove and the third groove respectively, and the first boss and the second boss abut against the locking roller to limit the axial displacement of the control sleeve;
or the locking sleeve is in a lower position state, the locking sleeve and the first groove move downwards relative to the control sleeve, the locking roller enters the first groove, and the control sleeve can displace and drive the finger-shaped hook to work.
Preferably, the side wall of the middle part of the unlocking pin is inwards recessed to form the unlocking groove, and the direction of the unlocking groove is intersected with the axial direction of the second hollow pipe body to form an included angle.
Preferably, the upper part of the latch piece is provided with a fourth groove for matching with the unlocking pin, and the fourth groove extends towards the axial direction of the latch piece; the lower part of the bolt piece is fixedly connected with the upper end of the core rod.
Preferably, the control element comprises a control pull rope for remotely controlling the unlocking pull rod to rotate up and down, and the control pull rope is connected with the unlocking pull rod.
The implementation of the utility model has the following beneficial effects: through arranging the rotary operation assembly and the reset mechanism in the execution mechanism, a worker can remotely loosen the fuel assembly by controlling the operation of the pull rope; not only the staff can cancel the pond operation of going down, avoids the risk that the operation brought, improves work efficiency, reduces the human cost, still possesses the function of auto-lock, prevents that fuel assembly from taking off in the transportation, strengthens transportation fuel assembly's security.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a cross-sectional view of a remotely operated short handled tool of the nuclear fuel assembly of the present invention;
FIG. 2 is an external block diagram of a remote operated short handled tool of the nuclear fuel assembly of the present invention;
FIG. 3 is an enlarged view of the box B shown in FIG. 1;
FIG. 4 is an enlarged view of the frame A shown in FIG. 1;
FIG. 5 is a block diagram of an unlocking pin in the remote operated short handled tool of the nuclear fuel assembly of the present invention;
FIG. 6 is a block diagram of a second connector in the remote operated short handled tool of the nuclear fuel assembly of the present invention;
fig. 7 is a block diagram of a latch member in the remotely operated short shank tool of the nuclear fuel assembly of the present invention;
FIG. 8 is a schematic view of a remotely operated short handled tool gripping fuel assembly of the present invention;
FIG. 9 is a schematic view of a remotely operated short handled tool release fuel assembly of the nuclear fuel assembly of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 shows a first embodiment of a remotely operated short handled tool of a nuclear fuel assembly of the present invention. The short handle tool can be used for grabbing fuel assemblies, and the short handle tool for remote operation of the nuclear fuel assemblies can be not limited to grabbing fuel assemblies, and has the advantages of remote operation, misoperation prevention, safety and reliability.
Further, in this embodiment, the short-handled tool for remote operation of nuclear fuel assembly may include an actuating mechanism, a suspension assembly, and a connecting mechanism, wherein the connecting mechanism is connected to the rotation operating assembly and the gravity self-locking mechanism, respectively. The actuator may be used to engage or disengage the fuel assembly. The hitch assembly is used to transport the entire short handle tool to a designated location. The connecting mechanism is used for supporting the whole structure of the whole short-handle tool and can be respectively connected with the hoisting assembly and the actuating mechanism. The rotary operating assembly can be matched with the actuating mechanism for use, so that the actuating mechanism is limited to work, the fuel assembly is protected from falling off in the transportation process, and the rotary operating assembly can be used for remotely operating and controlling the short-handle tool to release the fuel assembly. The gravity self-locking mechanism can also be used for limiting the work of the actuating mechanism, and the action of engaging or releasing the actuating mechanism is limited by the gravity.
As shown in fig. 1, in this embodiment, the actuator may include a first hollow tube 11, a jaw mechanism 12, and a stem 13. Specifically, the core rod 13 is disposed in the first hollow tube 11 and can perform reciprocating displacement along the first hollow tube 11 in the axial direction; the clamping jaw mechanism 12 is connected to the lower end of the first hollow pipe body 11 and is engaged or released along with the displacement of the core rod 13; it will be appreciated that the fuel assembly includes a housing having an opening formed therein for engagement with the jaw mechanism 12, the jaw mechanism 12 being extendable into the opening for engagement with an interior wall of the housing for transport of the fuel assembly, or alternatively, the jaw mechanism 12 being released and removed from the housing for transport.
Further, the gripper mechanism 12 includes a finger hook 121; in the embodiment, four finger-shaped hooks 121 bent outward are respectively arranged, opposite to each other and spaced below the core rod 13; it will be appreciated that the finger hooks 121 are not limited to finger hooks, and that suitable hook types may be used depending on the particular article to be grasped, and that four finger hooks 121 may be provided for greater stability, and in some embodiments at least one finger hook 121 may be provided.
A positioning component 18 is arranged on the circumferential side surface of the clamping jaw mechanism 12 and comprises a guide pin, a positioning pin and a first connecting piece 19; the guide pin is used for guiding the short-handle tool to the general orientation of the fuel assembly; the locating pin is used for accurate positioning after guiding, and ensures that the short handle tool can be safely engaged or released from the fuel assembly without errors. In the embodiment, the first connecting member 19 is a square structure and is fixedly connected to the bottom of the clamping jaw mechanism 12; two guide pins are arranged and respectively penetrate through and are fixedly connected with two opposite corners of the first connecting piece 19; the positioning pin passes through and is fixedly connected with the third angle of the first connecting piece 19; the positioning assembly 18 further includes a support pin passing through and fixedly coupled to a fourth corner of the first coupling member 19 as an additional support point. The fuel assembly is respectively provided with a guide hole and a positioning hole which are matched with the guide pin and the positioning pin, the lower end of the guide pin is inserted into the guide hole in sequence, and the clamping jaw mechanism can work after the lower end of the positioning pin is inserted into the positioning hole. Preferably, the guide pin and the positioning pin are cylindrical, so that the guide pin and the positioning pin can be conveniently inserted into the guide hole and the positioning hole; the length of each guide pin is greater than that of each positioning pin, so that the short-handle tool can be guided in one step and then accurately positioned; the outer diameter of the guide pin is larger than that of the positioning pin, so that the problem that the guide pin is easy to bend in the guide process is effectively solved.
As shown in fig. 1, a control sleeve 17 for controlling the finger-shaped hook 121 to open and close is arranged at the lower end of the core rod 13; specifically, the top end of the control sleeve 17 is provided with a first connecting member 19, and is fixedly connected with the core bar 13, in this embodiment, the first connecting member 19 is provided with a first slot 1711, the bottom of the core bar 13 is provided with a first convex portion matched with the first slot 1711, the first convex portion is clamped in the first slot 1711, and the first connecting member 19 is fixedly connected with the core bar 13. The control sleeve 17 moves up and down along with the core bar 13, the outer diameter of the bottom of the control sleeve 17 is larger than that of the upper end part of the control sleeve, the inner wall of the finger-shaped hook 121 can be abutted when the core bar 13 descends, so that the finger-shaped hook 121 completes the meshing action, and when the core bar 13 ascends, the control sleeve 17 leaves the finger-shaped hook 121, and the finger-shaped hook 121 is gathered to perform the loosening action.
As shown in fig. 1 and 2, the connecting mechanism includes a third hollow tube body 22, and the third hollow tube body 22 is connected to the bottom of the first hollow tube body 11; specifically, the first hollow tube 11 and the third hollow tube 22 are fixedly connected through a second disc 24, the second disc 24 is provided with a second hollow hole for fixedly connecting the core rod 13 and the control sleeve 17 arranged on the third hollow tube 22; furthermore, a limiting member 221 extending towards the direction of the control sleeve 17 is disposed on the inner wall of the third hollow tube 22, and a limiting groove 172 engaged with the limiting member 221 is disposed on the outer wall of the control sleeve 17 for limiting the maximum range of upward or downward movement of the control sleeve 17, so as to avoid the problem that the control sleeve 17 is too displaced upward to damage other internal components or too displaced downward to contact with the fuel assembly.
As shown in fig. 1 and 2, the connecting mechanism further includes a second hollow tube 21, and the second hollow tube 21 is sleeved on the upper portion of the outer periphery of the first hollow tube 11; specifically, a first disc 23 provided with a first hollow hole is connected above the second disc 24, the first hollow tube 11 is fixedly connected with the second disc 24 after passing through the first hollow hole, the second hollow tube 21 is fixedly connected with the first disc 23, and preferably, the second hollow tube 21 is vertically fixed on the upper surface of the first disc 23.
As shown in fig. 1, a rotary operation component is arranged at the top end of the first hollow tube 11 for controlling the releasing time of the fuel component; the rotary operating assembly mechanism comprises a rotatable unlocking pin 31, an unlocking pull rod 32 which rotates synchronously with the unlocking pin 31 and a control piece for driving the unlocking pull rod 32 to rotate; the side wall of the middle part of the unlocking pin 31 is inwards sunken to form an unlocking groove 311;
specifically, as shown in fig. 5, the side walls of the two opposite sides of the middle part of the unlocking pin 31 are recessed inwards to form an unlocking groove 311 for cooperating with the latch piece 14, and the latch piece 14 can pass through the unlocking pin 31 along the unlocking groove after the unlocking pin 31 rotates to a certain angle;
specifically, as shown in fig. 6, the top of the first hollow tube 11 is provided with a second connector 34, and the lower portion of the second connector 34 is fixedly connected to the top of the first hollow tube 11. In this embodiment, the lower portion of the second connecting member 34 is provided with an external thread, the inner wall of the top of the first hollow tube 11 is provided with an internal thread matching with the external thread, and the two are connected by a thread, and the second connecting member 34 is fixedly connected to the top of the first hollow tube 11. The second connecting piece 34 is provided with a third hollow hole 341 extending along the axial direction thereof, and the latch piece 14 is arranged in the third hollow hole 341 in a penetrating manner and then matched with the unlocking pin 31 to complete self-locking or unlocking action; both ends of the upper part of the second connecting piece 34 are provided with third through holes 342 extending along the radial direction thereof for penetrating and fixing the unlocking pin 31; preferably, the outer diameter of the upper portion of the second connector 34 is smaller than the inner diameter of the second hollow tube 21, and the outer diameter of the upper portion of the second connector 34 is larger than the outer diameter of the lower portion thereof, and when the lower portion of the second connector 34 is fixedly connected with the top of the first hollow tube 11, the lower surface of the upper portion of the second connector 34 abuts against the top of the first hollow tube 11.
Furthermore, the direction of the unlocking groove 311 formed by the inward concave side wall of the middle part of the unlocking pin 31 intersects with the axial direction of the second hollow tube 21 at an included angle, so that when the worker pulls the unlocking rod 32 downwards and upwards, the bolt piece 14 can better pass through the unlocking pin 31.
After the unlocking pin 31 passes through the third through hole 342 of the third connecting member 171, both ends of the unlocking pin 31 extend out of the second hollow tube 21 and are connected to the unlocking lever 32; furthermore, the unlocking pin 31 radially penetrates through the upper end of the second hollow tube 21, and two ends of the unlocking pin extend out of the circumferential side wall of the second hollow tube 21, and the extending end 312 is fixedly connected with the unlocking pull rod 32 and is matched with the unlocking pull rod 32 to rotate synchronously; in the embodiment, the unlocking pull rod 32 is U-shaped, the lower part of the unlocking pull rod 32 can be held by a worker, and a reinforcing rib can be arranged between two extending ends of the upper part of the unlocking pull rod for improving the structural strength of the unlocking pull rod; in addition, the end parts of the two extending ends of the upper part of the unlocking pull rod are respectively provided with a fourth connecting piece 321 which is fixedly connected with the extending end 312 of the unlocking pin 31; preferably, the fixed connection may be a screw connection provided on the fourth connecting member 321, a bolt hole on the protruding end 312 of the unlocking pin 31, and a bolt connecting the fourth connecting member 321 and the protruding end 312 of the unlocking pin 31 through the bolt hole, respectively; further, the fourth connector 321 may be a U-shaped member, and a side wall of the U-shaped member is provided with bolt holes.
As shown in fig. 1 and 3, a reset mechanism 15 for resetting the core rod 13 from the lower position to the upper position when no external pressure is applied is further provided in the first hollow tube 11; the upper end of the core rod 13 is provided with a latch piece 14 matched with the unlocking pin 31, the top of the latch piece 14 can be abutted against the bottom wall of the unlocking slot 311 to limit the displacement of the core rod 13, or the latch piece passes through the unlocking slot 311 under the matching of the unlocking pull rod 32 and the reset mechanism 15; in this embodiment, the upper portion of the latch member 14 is provided with a fourth recess 142 extending in the axial direction thereof for engagement with the unlocking pin 31, and the side wall of the unlocking pin 31 at the position of the unlocking groove 311 can pass through the fourth recess 142, thereby displacing the entire latch member 14 upward. The lower part of the bolt piece 14 is provided with a fifth connecting piece 143 which is fixedly connected with the upper end of the core rod 13; preferably, the fixed connection may be a snap connection, a second snap groove is formed in the fifth connecting member 143, a second convex portion matched with the second snap groove is formed in the upper portion of the core rod 13, the second convex portion is snapped in the second snap groove, and the fifth connecting member 143 is fixedly connected with the core rod 13.
As shown in fig. 3 and 7, the return mechanism 15 includes a spring member 151 and a spring pin 152 penetrating the spring member 151, both disposed in the first hollow tube 11; furthermore, the latch member 14 is provided with a radially extending protrusion 141, and the upper end of the spring pin 152 is fixedly connected to the lower surface of the protrusion 141; a fixing plate 153 is arranged below the spring in the first hollow tube 11, a fifth through hole capable of penetrating through the spring pin 152 is formed in the fixing plate 153, and after the lower end part of the spring pin 152 penetrates through the fifth through hole, the top end of the spring pin 152 is fixed on the protrusion 141 of the plug pin 14; when the latch member 14 is displaced downward, the spring member 151 is in a compressed state under the action of the protrusion 141 of the latch member 14 and the fixing plate 153; in this embodiment, the protruding portion 141 of the latch member 14 includes a cylindrical member sleeved on the middle portion of the latch member 14, and two spring members 151 and two spring pins 152 are respectively disposed on two sides of the lower surface of the cylindrical member, and the spring pins 152 are connected to the cylindrical member through threads, and two fixing plates 153 are simultaneously disposed and fixedly connected to the inner wall of the second hollow tube 21 for compressing the spring.
Further, after the stem 13 is moved downward, the unlocking lever 32 is rotated downward, the unlocking pin 31 is rotated until the bottom wall of the unlocking slot 311 thereof can contact the top end of the latch member 14, and the force of the latch member 14 acting on the unlocking slot 311 keeps the stem 13 in the downward state; because the flexible movable space of the plug pin 14 is reserved in the second hollow tube 21 above the unlocking pin 31, when the core rod 13 needs to move upwards, the unlocking pull rod 32 is rotated upwards to drive the unlocking pin 31 to rotate to a preset angle, the side wall of the unlocking pin 31 at the unlocking groove 311 can penetrate through the fourth groove 142 on the plug pin 14 under the action of the reset mechanism 15, the unlocking pin 31 can extend into the movable space of the second hollow tube 21, the core rod 13 synchronously moves upwards, and the clamping jaw mechanism 12 performs a loosening action.
As shown in fig. 2, the first hollow tube 11 and the second hollow tube 21 are respectively provided with a first opening 111 and a second opening 211 on the circumferential side, and the latch member 14 is provided with an operating lever 16 extending out of the first opening 111 and the second opening 211 along the radial direction thereof; specifically, the operating lever 16 is fixedly connected to the side walls of the protrusions 141 on the latch member 14, and in this embodiment, two operating levers 16 are provided, each of which is screwed to the side walls on the opposite sides of the cylindrical member; the operating handle 16 can move up and down at the overlapped position of the first opening 111 and the second opening 211, and the extending end 312 of the unlocking pin 31 extends out of the upper end part of the second opening 211 to be connected with the unlocking pull rod 32; when the operating handle 16 is displaced downwards, the transmission core bar 13 is displaced downwards, and the clamping jaw mechanism 12 is engaged with the fuel assembly; when the operating lever 16 is displaced upward, the drive stem 13 is displaced upward and the jaw mechanism 12 releases the fuel assembly.
As shown in fig. 1 and 4, a gravity interlock mechanism for restricting the movement of the control sleeve 17 is connected to the lower end of the second hollow tubular body 21; specifically, the circumferential side surface of the third hollow pipe body 22 is connected with a gravity self-locking mechanism, and the gravity self-locking mechanism comprises a locking sleeve 41 which is sleeved outside the control sleeve 17 and can axially displace relative to the control sleeve 17, a first interlocking plate 42 arranged on the inner wall of the locking sleeve 41 and a locking roller 43; the outer wall of the control sleeve 17 is also provided with a second interlocking plate 44 which is matched with the first interlocking plate 42; the locking roller 43 is movably connected in the side wall of the third hollow tube 22 and can abut against the first interlocking plate 42 or the second interlocking plate 44;
the first interlocking plate 42 is provided with a first groove 421 recessed inwards at the upper part of the first side surface, and a first boss 422 at the lower part; a second groove 441 is formed at the upper portion of the second side surface facing the first side surface of the second interlocking plate 44, a third groove 442 is formed at the lower portion of the second interlocking plate, and a second boss 443 is formed between the second groove 441 and the third groove 442;
in the locked state, the first groove 421 is staggered relative to the second groove 441 and the third groove 442, and the first boss 422 and the second boss 443 abut against the locking roller 43 to limit the axial displacement of the control sleeve 17;
after the positioning assembly 18 is positioned, the locking sleeve 41 and the first groove 421 move downward relative to the control sleeve 17, and the locking roller 43 enters the first groove 421, so that a moving space for controlling the displacement of the control sleeve 17 is reserved, and the finger-shaped hook 121 is controlled to work.
Specifically, a connecting column 231 is fixedly connected below the first disc 23, a second through hole axially penetrating through the body of the second disc 24 is formed in the second disc, and the connecting column 231 penetrates through the second through hole to be connected with the locking sleeve 41; a movable space is reserved between the first disc 23 and the second disc 24 and is used for enabling the first disc 23 to move up and down relative to the second disc 24; because the first disc 23 is connected with the second hollow tube 21, after the positioning assembly 18 is positioned, the second hollow tube 21, the first disc 23 and the locking sleeve 41 are linked and displaced downwards due to gravity, and are all in a lower position state; meanwhile, the first locking plate 42 is also in a lower position state, the locking roller 43 is not limited by the first boss 422 and the second boss 443, and can be displaced to the first groove 421, the control sleeve 17 can be displaced up and down, and the transmission clamping jaw mechanism 12 performs engagement or release action; during the lifting process, when the lifting device lifts the short-handle tool through the lifting ring 51 mechanism, the lifting device provides a lifting force to act on the first hollow tube body 11, the first disc 23 and the locking sleeve 41 to displace upwards, the first interlocking plate 42 is in an upper state, the first boss 422 and the second boss 443 and the locking roller 43 limit the displacement of the control sleeve 17, and the finger-shaped hook 121 is limited to engage or disengage.
As shown in fig. 2, the unlocking pull rod 32 is provided with a control pull rope 33 for remotely controlling the unlocking pull rod 32 to rotate up and down, and the length of the control pull rope 33 can be determined according to the distance between the fuel assembly and the transportation destination; in this embodiment, the operator pulls the control cord 33 at a high position to drivingly control the remote unlocking lever 32 to rotate upward.
As shown in fig. 8 and 9, the workflow of the whole fuel assembly remote operation short handle tool specifically includes:
the short-handle tool is taken out of the tool box through the hoisting device and moved to the position above the fuel assembly, at the moment, the locking sleeve 41 is in an upper locking state, the control sleeve 17 is limited and cannot move, and the clamping jaw mechanism 12 cannot work;
the short handle tool is controlled to descend, the positioning component 18 is inserted into a guide hole and a positioning hole which are arranged beside the fuel component and matched with the positioning component 18, after the guiding and positioning are finished, the locking sleeve 41 is changed into a lower unlocking state due to gravity, the control sleeve 17 is unlocked and can move up and down, the operating handle lever 16 is pressed down, and the transmission finger-shaped hook 121 is meshed with the fuel component; the unlocking pull rod 32 is rotated downwards, the reset mechanism 15 is in a compressed state, the latch piece 14 abuts against the side wall of the unlocking groove 311, and the locking clamping jaw mechanism 12 keeps an engaged state;
the short handle tool is controlled to ascend, the hoisting device provides ascending acting force to enable the locking sleeve 41 to be in an upper locking state, and the double-locking clamping jaw mechanism 12 keeps in a meshing state;
when the lifting device moves the short-handle tool engaged with the fuel assembly to a designated position, the short-handle tool is lowered, the positioning assembly 18 is inserted into the positioning hole to complete positioning, the locking sleeve 41 is changed into a lower unlocking state in the same way, the unlocking pull rod 32 can be rotated upwards by controlling the pull rope 33, the reset mechanism 15 provides acting force under the condition of losing external pressure, the bolt piece 14 penetrates through the unlocking groove 311, the core rod 13 is driven to move upwards, the finger-shaped hook 121 is loosened, and the work of loosening the fuel assembly is completed.
As shown in fig. 1, the top end of the second hollow pipe body 21 is connected to a hoist assembly for connection to a hoisting device. The hoisting assembly comprises a hoisting ring 51 and a hoisting connecting piece 52, the lower end of the hoisting connecting piece 52 is fixedly connected with the top end of the second hollow pipe body 21, and the modes of threaded connection, welding and the like can be adopted; the upper end of the hoisting connecting piece 52 is fixedly connected with a hoisting ring 51, the lower part of the hoisting ring 51 is provided with a first through hole connected with the hoisting connecting piece 52, the upper part of the connecting piece is provided with an external thread, and the external thread is connected with the hoisting ring 51 after penetrating through the first through hole and the hoisting ring 51; the upper end of the hanging ring 51 is arc-shaped, so that the hanging of the hoisting equipment is facilitated.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. A long-distance operation short handle tool for a nuclear fuel assembly comprises an actuating mechanism for taking and placing the fuel assembly, wherein the actuating mechanism comprises a first hollow pipe body (11) and a clamping jaw mechanism (12) connected to the lower end of the first hollow pipe body (11); a core rod (13) capable of axially reciprocating is arranged in the first hollow pipe body (11), and the clamping jaw mechanism (12) is engaged with or released from the fuel assembly along with the displacement of the core rod (13);
the fuel assembly releasing device is characterized in that a rotary operation assembly capable of controlling the releasing time of the fuel assembly is arranged at the top end of the first hollow pipe body (11); the rotary operation assembly comprises a rotatable unlocking pin (31), an unlocking pull rod (32) which rotates synchronously with the unlocking pin (31) and a control piece for driving the unlocking pull rod (32) to rotate; the side wall of the middle part of the unlocking pin (31) is inwards sunken to form an unlocking groove (311);
a reset mechanism (15) which resets the core rod (13) from a lower position state to an upper position state when no external pressure is applied is also arranged in the first hollow pipe body (11);
the upper end of the core rod (13) is provided with a bolt piece (14) matched with the unlocking pin (31); the latch piece (14) can abut against the bottom wall of the unlocking groove (311) to limit the displacement of the core rod (13); or passes through the unlocking slot (311) under the matching of the unlocking pull rod (32) and the reset mechanism (15), so that the core rod (13) is displaced.
2. The nuclear fuel assembly remote operated short handle tool according to claim 1, wherein a second hollow pipe body (21) is sleeved on an upper portion of the outer circumference of the first hollow pipe body (11);
the unlocking pin (31) radially penetrates through the upper end of the second hollow pipe body (21), and two ends of the unlocking pin extend out of the circumferential side wall of the second hollow pipe body (21) to be fixedly connected with the unlocking pull rod (32) and are matched with the unlocking pull rod (32) to rotate synchronously; the lower end of the second hollow pipe body (21) is connected with the clamping jaw mechanism (12);
and an active space for the bolt piece (14) to stretch and retract is reserved in the second hollow pipe body (21) above the unlocking pin (31).
3. The long-distance operation short handle tool for nuclear fuel assembly according to claim 2, characterized in that the first hollow tube body (11) and the second hollow tube body (21) are respectively provided with a first opening (111) and a second opening (211) at the circumferential side, the plug member (14) is provided with an operation hand lever (16) extending out of the first opening (111) and the second opening (211) along the radial direction thereof;
the operating hand lever (16) controls the axial reciprocating displacement of the core rod (13) in a transmission way.
4. The nuclear fuel assembly remote operated short handle tool of claim 2 wherein the jaw mechanism (12) comprises a finger hook (121); the lower end of the core rod (13) is provided with a control sleeve (17) for controlling the finger-shaped hook (121) to open and close; the control sleeve (17) moves downwards to abut against and drive the finger-shaped hook (121) to complete meshing work.
5. The nuclear fuel assembly remote short handle tool of claim 1 wherein the return mechanism (15) comprises a spring member (151) and a spring pin (152) disposed through the spring member (151); the bolt piece (14) is provided with a protruding part (141) extending in the radial direction, a fixing plate (153) is arranged below the spring in the first hollow pipe body (11), the lower end part of the spring pin shaft (152) penetrates through the fixing plate (153), and the top end of the spring pin shaft (152) is fixedly connected with the protruding part (141) of the bolt piece (14);
when the core rod (13) is in a lower position, the fixing plate (153) abuts against and compresses the spring member (151).
6. The nuclear fuel assembly remote operated short handle tool according to claim 4, wherein the lower end of the second hollow tube body (21) is provided with a gravity interlock mechanism for restricting the movement of the control sleeve (17).
7. The nuclear fuel assembly remote short handle tool of claim 6 wherein the gravity interlock mechanism comprises a locking sleeve (41) fitted over the control sleeve (17) and axially displaceable relative to the control sleeve (17), a first interlock plate (42) disposed on an inner wall of the locking sleeve (41), and a locking roller (43); a second interlocking plate (44) matched with the first interlocking plate (42) is also arranged on the outer wall of the control sleeve (17); the locking roller (43) is movably connected between the first interlocking plate (42) and the second interlocking plate (44);
the first interlocking plate (42) is provided with a first concave groove (421) at the upper part of the first side surface, and a first boss (422) at the lower part; a second groove (441) is formed in the upper portion, facing the second side face of the first side face, of the second interlocking plate (44), a third groove (442) is formed in the lower portion of the second interlocking plate, and a second boss (443) is formed between the second groove (441) and the third groove (442);
the locking sleeve (41) is in an upper state, the first groove (421) is staggered relative to the second groove (441) and the third groove (442), and the first boss (422) and the second boss (443) abut against the locking roller (43) to limit the axial displacement of the control sleeve (17);
or the locking sleeve (41) is in a lower position, the locking sleeve (41) and the first groove (421) move downwards relative to the control sleeve (17), the locking roller (43) enters the first groove (421), and the control sleeve (17) can move and drive the finger hook (121) to work.
8. The nuclear fuel assembly remote-operated short handle tool according to claim 2, wherein a direction in which the central side wall of the unlocking pin (31) is recessed inward to form the unlocking groove (311) intersects with an axial direction of the second hollow tube body (21) at an angle.
9. The nuclear fuel assembly remote operated short handle tool according to claim 1, wherein an upper portion of the latch member (14) is provided with a fourth groove (142) for engaging with the release pin (31), the fourth groove (142) extending in an axial direction of the latch member (14); the lower part of the bolt piece (14) is fixedly connected with the upper end of the core rod (13).
10. The nuclear fuel assembly remote operated short handle tool according to claim 1, wherein the control member comprises a control cord (33) for remotely controlling the unlocking lever (32) to rotate up and down, the control cord (33) being connected to the unlocking lever (32).
CN202121101937.XU 2021-05-21 2021-05-21 Long-distance operation short-handle tool for nuclear fuel assembly Active CN215341974U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121101937.XU CN215341974U (en) 2021-05-21 2021-05-21 Long-distance operation short-handle tool for nuclear fuel assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121101937.XU CN215341974U (en) 2021-05-21 2021-05-21 Long-distance operation short-handle tool for nuclear fuel assembly

Publications (1)

Publication Number Publication Date
CN215341974U true CN215341974U (en) 2021-12-28

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