Grillwork spring relaxation device and use method thereof

Abstract

The invention discloses a grillage spring relaxation device and a using method thereof. The grillage spring relaxation device comprises a lower template, an upper template, a limiting piece and an adjusting assembly. According to the grillwork spring relaxation device, the lower die plate is adopted as a supporting device of the grillwork spring so as to support and position the grillwork spring, the limiting holes are formed in the lower die plate and used for being matched with the limiting pieces so that the required compression amount of the grillwork spring can be met, the limiting pieces of different sizes and specifications can be selected so that initial adjustment of the compression amount can be conducted according to actual requirements, and the operation is convenient. According to the grillwork spring relaxation device, the grillwork spring is compressed through the upper die plate, the grillwork spring can be kept in a compressed state for a long time, the effect of relaxing the spring is achieved, the grillwork spring generates plastic deformation, the compression amount of the grillwork spring can be flexibly adjusted through the adjusting assembly, and the grillwork spring relaxation device can obtain the large relaxation amount. And the loosening amount of the grillage spring is more uniform.

Description

Technical Field

[0001] The invention relates to the technical field of pressurized water reactor fuel assemblies, and in particular to a grid spring relaxation device and a use method thereof. Background Art

[0002] The grid spring is an important component of the grid of the pressurized water reactor fuel assembly. The grid spring and the grid rigid convex form a clamping system to achieve the positioning and clamping of the fuel rods. During the operation in the reactor, it resists the hydraulic lifting force and its own gravity to maintain the relative position of the fuel rods in the assembly.

[0003] During operation, the spring will relax due to the influence of irradiation creep. After the spring relaxes, the spring force will decrease, the clamping performance of the spring on the fuel rod will weaken, and the vibration abrasion will increase.

[0004] In order to study the effects of different grid spring relaxation amounts on the vibration characteristics and wear resistance of fuel rods, grid relaxation needs to be carried out.

[0005] The existing grid relaxation method is mainly the rod insertion method, which inserts thick rods with a diameter larger than the fuel rods into the grid to cause plastic deformation of the springs, thereby achieving the required relaxation effect. However, this solution has certain defects, such as the inability to achieve the required large relaxation amount, because when the rod diameter is increased to a certain extent, the thick rod cannot be inserted due to the limitation of the rigid convexity; in addition, the relaxation amount obtained by this method is not regular. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a grid spring relaxation device and a method for using the same.

[0007] The technical solution adopted by the present invention to solve the technical problem is: construct a grid spring relaxation device, which includes:

[0008] A lower template, used for supporting and positioning the grid spring, wherein the lower template is provided with a limiting hole;

[0009] An upper template, mounted on the lower template and used to compress the grid spring;

[0010] A limiting member, installed on the limiting hole and used to limit the compression amount of the grid spring;

[0011] The adjusting assembly comprises a positioning rod installed on the lower template and a plurality of adjusting washers rotatably connected to the positioning rod, wherein the adjusting washers are used to adjust the compression amount of the grid spring.

[0012] In some embodiments, the grid spring relaxation device also includes a fastener, the lower template is provided with a first matching hole, the upper template is provided with a second matching hole corresponding to the first matching hole, the fastener is passed through the second matching hole and installed on the first matching hole to fix the position of the lower template and the upper template.

[0013] In some embodiments, the number of the first matching holes is two, and the two first matching holes are distributed on both sides of the lower template;

[0014] The number of the second matching holes is two, and the two second matching holes are distributed on both sides of the upper template.

[0015] In some embodiments, the first mating hole is a bolt hole, and the second mating hole is a through hole.

[0016] In some embodiments, the limiting member is a limiting pin, and the fastening member is a fastening screw.

[0017] In some embodiments, a first avoidance hole is provided on the lower template, and a second avoidance hole corresponding to the first avoidance hole is provided on the upper template.

[0018] In some embodiments, the lower template is provided with a groove for positioning the grid spring.

[0019] In some embodiments, the number of the limiting holes is four, and the four limiting holes are arranged at the four corners of the lower template.

[0020] In some embodiments, the lower template and the upper template are both made of stainless steel.

[0021] In this embodiment, a method for using the grid spring relaxation device is also constructed, which is based on the grid spring relaxation device and includes the steps of:

[0022] S1, installing the grid spring on the groove of the lower template;

[0023] S2. Install the limiter on the limit hole;

[0024] S3. Adjust the number of gaskets according to actual needs;

[0025] S4. Use fasteners to connect and fix the upper template and the lower template.

[0026] The implementation of the present invention has the following beneficial effects: the lattice spring relaxation device uses a lower template as a support device for the lattice spring to support and position the lattice spring, and a limit hole is provided on the lower template for cooperating with a limit member to meet the required compression amount of the lattice spring, and limit members of different sizes can be selected to adjust the initial compression amount according to actual needs, and the lattice spring relaxation device also uses an upper template to compress the lattice spring, which can keep the lattice spring in a compressed state for a long time, achieving the effect of relaxing the spring, and causing the lattice spring to produce plastic deformation. At the same time, because the adjustment gasket can rotate relative to the positioning rod, the compression amount of the lattice spring can be flexibly adjusted by using different numbers of adjustment gaskets, and the lattice spring relaxation device can obtain a large relaxation amount and a more uniform relaxation amount of the lattice spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 is a schematic diagram of the cooperation between the upper template and the grid spring in some embodiments of the present invention;

[0029] Figure 2 is a schematic structural diagram of an upper template in some embodiments of the present invention;

[0030] Figure 3 is a schematic structural diagram of a lower template in some embodiments of the present invention;

[0031] Figure 4 is a partial coordination schematic diagram of a grid spring relaxation device in some embodiments of the present invention;

[0032] Figure 5 It is a schematic diagram of the overall structure of the grid spring relaxation device in some embodiments of the present invention. DETAILED DESCRIPTION

[0033] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0034] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] See also Figures 1 to 5 , is a grid spring relaxation device in some embodiments of the present invention, which includes a lower template 1, an upper template 2, a limiter 3 and an adjustment assembly 4, the lower template 1 is used to support and position the grid spring 5, and the lower template 1 is provided with a limiter hole 11; the upper template 2 is installed on the lower template 1, and is used to compress the grid spring 5; the limiter 3 is installed on the limiter hole 11, and is used to limit the compression amount of the grid spring 5; the adjustment assembly 4 includes a positioning rod 41 installed on the lower template 1 and a plurality of adjustment gaskets 42 rotatably connected to the positioning rod 41, and the adjustment gasket 42 is used to adjust the compression amount of the grid spring 5.

[0036] It can be understood that the grid spring relaxation device uses the lower template 1 as a supporting device for the grid spring 5 to support and position the grid spring 5, and the lower template 1 is provided with a limit hole 11 for cooperating with the limit member 3 to meet the required compression amount of the grid spring 5. The limit members 3 of different sizes can be selected to adjust the initial compression amount according to actual needs, and the grid spring relaxation device also uses the upper template 2 to compress the grid spring 5, which can keep the grid spring 5 in a compressed state for a long time, so as to achieve the effect of relaxing the spring and cause the grid spring 5 to produce plastic deformation. At the same time, since the adjustment gasket 42 can be rotated relative to the positioning rod 41, the compression amount of the grid spring 5 can be flexibly adjusted by using different numbers of adjustment gaskets 42, and the grid spring relaxation device can obtain a grid spring 5 with a large relaxation amount and a more uniform relaxation amount.

[0037] The grid spring relaxation device further includes a fastener 6. A first matching hole 12 is provided on the lower template 1, and a second matching hole 21 corresponding to the first matching hole 12 is provided on the upper template 2. The fastener 6 is passed through the second matching hole 21 and installed on the first matching hole 12 to fix the position of the lower template 1 and the upper template 2. After the compression amount of the grid spring 5 is adjusted, the upper template 2 and the lower template 1 are fixed by the fastener 6. In this embodiment, the number of the first matching holes 12 is two, and the two first matching holes 12 are distributed on both sides of the lower template 1. The number of the second matching holes 21 is two, and the two second matching holes 21 are distributed on both sides of the upper template 2. The first matching hole 12 is a bolt hole, the second matching hole 21 is a through hole, the limiter 3 is a limit pin, and the fastener 6 is a fastening screw.

[0038] Furthermore, the lower template 1 is provided with a first avoidance hole 13, and the upper template 2 is provided with a second avoidance hole 23 corresponding to the first avoidance hole 13. The first avoidance hole 13 and the second avoidance hole 23 are used to avoid the mixing wing, the rigid protrusion, the welding tongue and other components. In addition, the lower template 1 is provided with a groove 14 for positioning the grid spring 5.

[0039] like Figure 1 and Figure 2 As shown, there are four limiting holes 11 , which are arranged at four corners of the lower template 1 to ensure the uniformity of the grid spring 5 during the compression process.

[0040] The lower template 1 and the upper template 2 are both made of stainless steel to ensure that the lower template 1 and the upper template 2 have sufficient strength and rigidity, and to ensure the wear resistance and corrosion resistance of the lower template 1 and the upper template 2.

[0041] In this embodiment, a method for using a grid spring relaxation device is also constructed, which is based on the above-mentioned grid spring relaxation device and includes the following steps: S1, installing the grid spring 5 on the groove 14 of the lower template 1; S2, installing the limit member 3 on the limit hole 11; S3, adjusting the number of adjustment gaskets 42 according to actual needs; S4, using fasteners 6 to connect and fix the upper template 2 and the lower template 1.

[0042] Specifically, during the relaxation process of the grid spring 5, the grid spring 5 is first placed on the lower template 1, and then the limiter 3 is placed on the lower template 1, and then the number of the adjusting gaskets 42 is adjusted, and then the upper template 2 is placed on the lower template 1. At this time, the upper template 2 has compressed the grid spring 5, and finally the fastener 6 is installed to complete the fixation of the upper template 2 and the lower template 1. The use method of the grid spring relaxation device solves the problems that the existing grid spring 5 relaxation method cannot obtain a grid spring 5 with a large relaxation amount and the relaxation amount obtained by the existing grid spring 5 relaxation method is irregular.

[0043] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A grid spring relaxation device, characterized in that: include: A lower template (1) is used to support and position the grid spring (5), and a limiting hole (11) is provided on the lower template (1); An upper template (2) is mounted on the lower template (1) and is used to compress the grid spring (5); A limiting member (3) is installed on the limiting hole (11) and is used to limit the compression amount of the grid spring (5); An adjustment assembly (4) comprises a positioning rod (41) mounted on the lower template (1) and a plurality of adjustment washers (42) rotatably connected to the positioning rod (41), wherein the adjustment washers (42) are used to adjust the compression amount of the grid spring (5).

2. The grid spring relaxation device according to claim 1, characterized in that: The grid spring relaxation device also includes a fastener (6), the lower template (1) is provided with a first matching hole (12), the upper template (2) is provided with a second matching hole (21) corresponding to the first matching hole (12), the fastener (6) is passed through the second matching hole (21) and installed on the first matching hole (12) to fix the position of the lower template (1) and the upper template (2).

3. The grid spring relaxation device according to claim 2, characterized in that: The number of the first matching holes (12) is two, and the two first matching holes (12) are distributed on both sides of the lower template (1); The number of the second matching holes (21) is two, and the two second matching holes (21) are distributed on both sides of the upper template (2).

4. The grid spring relaxation device according to claim 2, characterized in that: The first matching hole (12) is a bolt hole, and the second matching hole (21) is a through hole.

5. The grid spring relaxation device according to claim 2, characterized in that: The limiting member (3) is a limiting pin, and the fastening member (6) is a fastening screw.

6. The grid spring relaxation device according to claim 1, characterized in that: The lower template (1) is provided with a first avoidance hole (13), and the upper template (2) is provided with a second avoidance hole (23) corresponding to the first avoidance hole (13).

7. The grid spring relaxation device according to claim 1, characterized in that: The lower template (1) is provided with a groove (14) for positioning the grid spring (5).

8. The grid spring relaxation device according to claim 1, characterized in that: The number of the limiting holes (11) is four, and the four limiting holes (11) are arranged at the four corners of the lower template (1).

9. The grid spring relaxation device according to claim 1, characterized in that: The lower template (1) and the upper template (2) are both made of stainless steel.

10. A method for using a lattice spring relaxation device, based on the lattice spring relaxation device according to any one of claims 1 to 9, characterized in that: Includes steps: S1, installing the grid spring (5) on the groove (14) of the lower template (1); S2, installing the limiting member (3) on the limiting hole (11); S3. Adjust the number of the adjustment gaskets (42) according to actual needs; S4. Use fasteners (6) to connect and fix the upper template (2) and the lower template (1).

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