CN217606562U

CN217606562U - Special gripping apparatus for nuclear fuel assembly

Info

Publication number: CN217606562U
Application number: CN202220935629.5U
Authority: CN
Inventors: 钱立波; 李仕民; 曹聚明; 王恒; 吴有峰; 霍明庆; 周琦
Original assignee: China Nuclear Longan Co ltd
Current assignee: China Nuclear Longan Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-10-18
Anticipated expiration: 2032-04-22

Abstract

The application provides a special gripping apparatus of nuclear fuel assembly, includes: the top cover (1), the top cover (1) is provided with a through hole; the bottom cover (2), the bottom cover (2) is a hollow annular structure; a push rod (3) movably extending into the top cover (1) from the through hole; the grapple module is arranged between the top cover (1) and the bottom cover (2); the grapple module comprises at least one grapple (4) connected or in contact with the push rod (3) for protruding from the bottom cover (2) and grabbing an object. Move through grapple and grapple support to contact through grapple and fuel assembly side, realize accurate and efficient to fuel assembly's the work of snatching, simple structure, simple to operate operates safe and reliable, has avoided unexpected release simulation fuel assembly, has reduced the potential safety hazard and has improved work efficiency.

Description

Special gripping apparatus for nuclear fuel assembly

Technical Field

The application relates to the technical field of hoisting grippers, in particular to a gripper special for a nuclear fuel assembly.

Background

In the wet unloading process of the nuclear fuel post-treatment plant, routine inspection can be carried out on the nuclear fuel assembly unloading system, the nuclear fuel assembly unloading system is located below the water surface of a water pool of the unloading plant, and corresponding maintenance is carried out after the fuel assembly gripping apparatus is remotely disassembled from the water pool during maintenance.

Traditional fuel assembly gripping apparatus moves comparatively loaded down with trivial details when snatching fuel assembly, and gripping apparatus stability and reliability are relatively poor, and is wayward to fuel assembly's the dynamics of snatching moreover, and the directness has reduced the security of snatching fuel assembly.

Therefore, a new fuel assembly gripping apparatus needs to be designed to solve the problem of potential safety hazard caused by poor firmness of gripping the fuel assembly.

SUMMERY OF THE UTILITY MODEL

To solve the problems set forth in the background art described above. The gripping apparatus special for the nuclear fuel assembly is designed, and has the characteristics of ensuring the stability and safety of gripping the fuel assembly and being convenient and fast in the process of lifting the nuclear fuel assembly.

The application provides a special gripping apparatus of nuclear fuel assembly, includes:

the top cover is provided with a through hole;

the bottom cover is of a hollow annular structure;

the push rod movably extends into the top cover from the through hole; and

the grapple module is arranged between the top cover and the bottom cover; the grapple module comprises at least one grapple which is connected with or contacted with the push rod and is used for extending out of the bottom cover and grabbing objects.

According to an embodiment of the present application, the grapple module further comprises at least one grapple bracket; each grapple support is connected with a grapple.

According to one embodiment of the application, the inside of the grapple support is provided with a groove, and the grapple is embedded in the groove; the upper end of the grapple is rotatably connected with the grapple support.

According to an embodiment of the application, the upper end of the grapple and the grapple support are rotatably connected by a pin.

According to an embodiment of the application, still include to be located the recess reset spring, reset spring's both ends are connected respectively the grapple support with the grapple is used for with the grapple resumes to former rotational position.

According to one embodiment of the application, the lower end of the grapple has a lower protruding edge facing towards or away from the push rod, the lower protruding edge being intended to be fixed to an object.

According to one embodiment of the application, the upper end of the grapple is provided with an upper convex edge gradually protruding towards the push rod, and the surface of the upper convex edge, which is connected or contacted with the push rod, is a straight line or a curve in uniform transition or step transition.

According to an embodiment of the application, the bottom of push rod is equipped with to the bellied protruding structure of grapple module, protruding structure with go up protruding edge sliding contact.

According to an embodiment of the present application, a locking module is provided between the upper cover and the push rod.

According to an embodiment of the present application, the bottom cover is circumferentially provided with at least one positioning pin protruding downward.

Compared with the prior art, the beneficial effects of the utility model include:

move through grapple and grapple support to contact through grapple and fuel assembly side, realize accurate and efficient to fuel assembly's the work of snatching, simple structure, simple to operate operates safe and reliable, has avoided unexpected release simulation fuel assembly, has reduced the potential safety hazard and has improved work efficiency.

Through the slip of locking module, play the limiting displacement to the grapple, improve the stability and the security of gripping apparatus in the grabbing process.

Through the setting of locating pin, can realize accurate positioning fuel assembly, positioning accuracy when improving the subassembly and snatching.

Drawings

Fig. 1 shows a perspective view of a gripper specific for nuclear fuel assemblies according to the present application.

Fig. 2 showsbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of the gripping apparatus specific tobase:Sub>A nuclear fuel assembly according to the present application.

Fig. 3 showsbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A andbase:Sub>A partially enlarged view of the gripping apparatus forbase:Sub>A nuclear fuel assembly according to the present application.

Fig. 4 shows a D-D cross-sectional view of a gripping apparatus specific to a nuclear fuel assembly according to the present application.

Fig. 5 shows a cross-sectional E-E view of the gripping apparatus specific to the nuclear fuel assembly of the present application.

Fig. 6 shows a schematic view of the locking unit in the locked state.

Fig. 7 shows a schematic view of the locking unit in the unlocked state.

Detailed Description

The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.

In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description is not to be taken in a limiting sense, and the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

Fig. 1 shows a perspective view of a gripper specific for nuclear fuel assemblies according to the present application. Fig. 2 shows a cross-sectional view a-a of the gripping apparatus specific to a nuclear fuel assembly according to the present application. Fig. 3 shows a cross-sectional view a-a and a partially enlarged view of the gripping apparatus for a nuclear fuel assembly according to the present application. Wherein, this special gripping apparatus of nuclear fuel assembly includes: top cap 1, bottom 2, push rod 3 and grapple module.

Specifically, the outer edge of the bottom surface of the top cover 1 is fixedly connected with the upper end of the grapple module, and the outer edge of the top surface of the bottom cover 2 is fixedly connected with the lower end of the grapple module through bolts, so that a hollow cavity is formed for the push rod 3 to move in. A through hole is reserved in the center of the top cover 1 and is used for penetrating the push rod 3. Optionally, the through hole is circular, square or special-shaped, and only the push rod 3 can be accommodated. More preferably, the center of the through hole coincides with the center of the top cover 1, so that the push rod 3 can move at the axis of the cavity.

Specifically, the bottom cover 2 is a hollow annular structure; the grapple module comprises at least one grapple 4, the grapple 4 is connected or contacted with the push rod 3, the grapple 4 also extends out of the bottom cover 2, and the grapple 4 can be pushed to move towards or away from each other along with the movement of the push rod 3 in the cavity, thereby realizing the function of grabbing the nuclear fuel assembly.

In particular, the outermost edge of the special gripping apparatus for the nuclear fuel assembly can be provided with a cylinder body which is used for encapsulating the integral structure of the special gripping apparatus. This cylinder body plays the effect of reinforcing overall structure integrality and reinforced structure. The cylinder body is the main structure of the gripping apparatus, and other modules are installed on the cylinder body structure. The cylinder body structure is directly connected with a crane hoisting mechanism, bears all stress in the hoisting process, and has higher requirement on the structural rigidity of the cylinder body structure.

(about push rod 3)

The push rod 3 is connected with a driving mechanism (not shown in the figure) and the grapple 4, and the push rod 3 can push the grapple 4 to move towards or away from each other, thereby realizing the function of grabbing the nuclear fuel assembly. The pneumatic driving mechanism is selected to ensure that the grapple 4 is stable and reliable when opening and closing to move in consideration of the requirements of higher radioactivity of the working environment and safety and reliability.

Optionally, the push rod 3 is formed by coaxially connecting two or more push rod 3 units.

(about grapple module)

The grapple module further comprises at least one grapple bracket 5; each gripper bracket 5 is connected to a gripper 4. A groove is formed in the inner side of the grapple support 5, and the grapple 4 is embedded in the groove; the upper end of the grapple 4 is rotatably connected with the grapple bracket 5.

Optionally, the upper end of the grapple 4 and the grapple bracket 5 are rotatably connected by a pin 6. Namely, the two sides of the upper half part of the groove of the grapple support 5 are respectively provided with a through hole, the corresponding position of the upper end of the grapple 4 is also provided with a through hole, and the grapple support are aligned and then penetrate into the coaxial through holes by utilizing a pin shaft 6, so that the grapple 4 and the grapple support 5 are rotatably connected. The thickness of the pin 6 and the through hole and the corresponding distance in the groove are not particularly limited in this embodiment and this application, but only the relative rotation between the grapple 4 and the grapple support 5 may take place.

More preferably, in order to enable the grapple 4 and the grapple support 5 to return to the original position after rotating, a return spring 7 is further disposed in the groove, and two ends of the return spring 7 are respectively connected to the grapple support 5 and the grapple 4, and are used for returning the grapple 4 to the original rotating position.

The original rotation position refers to the initial position of the grapple 4 before being driven by the push rod 3, relative to the end position of the grapple support 5 after rotation; alternatively, the original rotational position is the end position of the grapple 4 after being driven by the push rod 3, with respect to the initial position before the rotation of the grapple support 5. The reset spring 7 can be arranged at the upper end or the lower end of the pin shaft 6 according to actual conditions, and the grapple 4 is restored to the corresponding original rotating position according to actual conditions.

(about grapple 4)

The end of the grapple 4 connected with the pin shaft 6 is the upper end of the grapple 4, the upper end of the grapple 4 is provided with an upper convex edge 41 which gradually protrudes towards the push rod 3, and the surface of the upper convex edge 41 which is connected with or contacted with the push rod 3 is a straight line or a curve which is in uniform transition or step transition. The upper ledge 41 is connected to or in contact with the lower end of the push rod 3, and the ledge 41 is pressed by the ledge structure 31 during the movement of the push rod 3, pushing the grapple 4 equally, gradually or gently, depending on the specific shape of the surface to which it is connected or in contact with.

The grapple 4 takes the pin shaft 6 as the axis and rotates under the driving of the push rod 3. The lower end of the grapple 4 is provided with a lower protruding edge 42 facing to or away from the push rod 3, and the lower protruding edge 42 is used for fixing with an object.

Taking the example shown in fig. 4 as an example, fig. 4 shows a D-D cross-sectional view of the gripping apparatus dedicated for nuclear fuel assemblies of the present application. Fig. 5 shows a cross-sectional view E-E of the gripping apparatus specific to the nuclear fuel assembly of the present application. Wherein, the push rod 3 pushes the upper convex edge 41 in the process of moving downwards, so that the grapple 4 takes the pin shaft 6 as the axis, and the lower end of the grapple 4 rotates outwards and opens. The lower protruding edge 42 at the lower end of the grapple 4 deviates from the direction of the push rod 3 and is fixed with the grabbed nuclear fuel assembly in the process that the grapple 4 rotates outwards, so that the grabbing function is realized.

(with locking module)

Fig. 6 shows a schematic view of the locking module in the locked state. Fig. 7 shows a schematic view of the locking module in an unlocked state. The locking mode provided in the embodiment adopts a mode of locking the slide block 10, and the electric push rod 3 is adopted to drive the slide block 10. The adoption of the locking structure mainly considers that: 1. the control push rod 3 is small in stress, the slider 10 is small in stress in the vertical direction, and the locking mode can be met functionally; 2. the slider 10 has low manufacturing cost and long service life; 3. the driving design of the locking unit 11 is simple and easy for standardized production. The locking of the up-and-down movement of the control push rod 3 is realized, and the locking of the position of the gripper is ensured.

Preferably, a locking module is provided between the upper cover and the push rod 3. The locking module comprises at least one slider 10, a locking unit 11 and a connecting shaft 9.

When two or more sliders 10 are used, the sliders 10 are slidably disposed on the upper surface of the top cover 1 in a symmetrical or asymmetrical manner. The two sliders 10 are connected to each other with a locking unit 11 through connecting shafts 9, respectively.

The locking unit 11 is provided on the push rod 3 above the top cover 1. The locking unit 11 may be electrically driven to move up and down.

Fig. 6 and 7 show the connecting shaft 9 in a chevron shape. When the locking unit 11 is moved downwards, the bottom ends of the connecting shafts 9 are moved away from each other, thereby pushing the sliders 10 to also move away from each other. The middle sections of the two sliding blocks 10 are bent, when the sliding blocks 10 move away from each other, the middle sections of the sliding blocks 10 are separated from each other, and the distance between the separated sliding blocks 10 is larger than or equal to the through hole in the top cover 1.

When the locking units 11 move upwards, the bottom ends of the connecting shafts 9 approach each other, thereby pushing the sliders 10 to move towards each other. The distance between the two sliding blocks 10 is smaller than the through hole on the top cover 1.

Correspondingly, a corresponding locking groove is also provided on the push rod 3. The locking groove can be chiseled on the push rod 3, and can also be formed into a structure with relative concave diameter by protruding outwards from the rod body of the push rod 3. The middle sections of the two locking blocks are mutually matched under the locking groove and the locking state to form a clamping and fixing mode to lock the positions of the push rod 3 and the grapple 4, so that the fuel assembly is ensured to be stably lifted on the grapple without falling.

(about the positioning pin 8)

In the present embodiment, the bottom cover 2 is provided with at least one positioning pin 8 protruding downward along the circumference. The number of the positioning pins 8 is preferably 4 or more, and the number of the positioning pins 8 is 4 in the embodiment and is symmetrically distributed below the bottom cover 2. The positioning pin 8 is used for being matched with a positioning hole in a pipe seat of the fuel assembly to complete the positioning of the gripping apparatus on the fuel assembly.

For different types of fuel assemblies, the fuel assembly gripper is designed into multiple sizes while keeping the function and the structure unchanged, and the gripper can grip the fuel assemblies. The standardized joint of the gripping apparatus is designed, and the interchange can be realized quickly.

The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.

Claims

1. A gripper for nuclear fuel assemblies, comprising:

the top cover (1), the top cover (1) is provided with a through hole;

the bottom cover (2), the bottom cover (2) is a hollow annular structure;

a push rod (3) movably extending into the top cover (1) from the through hole; and

the grapple module is arranged between the top cover (1) and the bottom cover (2); the grapple module comprises at least one grapple (4) connected or in contact with the push rod (3) for protruding from the bottom cover (2) and grabbing an object.

2. The gripping apparatus dedicated to nuclear fuel assemblies according to claim 1, characterized in that said grapple module further comprises at least one grapple bracket (5); each grapple support (5) is connected with a grapple (4).

3. The gripper special for nuclear fuel assemblies according to claim 2, characterized in that the inside of the gripper bracket (5) is provided with a groove in which the gripper (4) is embedded; the upper end of the grab hook (4) is rotatably connected with the grab hook bracket (5).

4. The gripper special for nuclear fuel assemblies according to claim 3, characterized in that the upper end of the gripper (4) and the gripper bracket (5) are rotatably connected by a pin (6).

5. The special gripping apparatus for nuclear fuel assemblies according to claim 4, characterized by further comprising a return spring (7) positioned in the groove, wherein both ends of the return spring (7) are respectively connected with the gripping hook bracket (5) and the gripping hook (4) for returning the gripping hook (4) to the original rotation position.

6. The gripping apparatus for nuclear fuel assemblies according to claim 1, characterized in that the lower end of the gripping hook (4) has a lower ledge (42) facing towards or away from the push rod (3), the lower ledge (42) being intended to be fixed to an object.

7. The gripper special for nuclear fuel assemblies according to any one of claims 1 to 5, characterized in that the upper end of the gripper hook (4) is provided with an upper convex edge (41) which gradually protrudes towards the push rod (3), and the surface of the upper convex edge (41) which is connected or contacted with the push rod (3) is a straight line or a curve with uniform transition or step transition.

8. The gripper for nuclear fuel assemblies according to claim 7, characterized in that the bottom of the push rod (3) is provided with a protruding structure (31) protruding towards the gripper hook module, said protruding structure (31) being in sliding contact with the upper protruding rim (41).

9. The gripping apparatus for nuclear fuel assemblies according to claim 7, characterized in that a locking module is provided between the top cover (1) and the push rod (3).

10. Gripper for nuclear fuel assemblies according to claim 1, characterized in that said bottom cover (2) is circumferentially provided with at least one positioning pin (8) projecting downwards.