CN217059688U

CN217059688U - Stress corrosion test device

Info

Publication number: CN217059688U
Application number: CN202220019705.8U
Authority: CN
Inventors: 龚鹏锋; 黄洁明; 高长源; 陈刘涛; 李伟才; 张国梁
Original assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd; Lingdong Nuclear Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd; Lingdong Nuclear Power Co Ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-07-26
Anticipated expiration: 2032-01-05

Abstract

The utility model relates to a stress corrosion test device, which comprises a bolt, a supporting seat and a movable block; the supporting seat is provided with a screw hole for mounting the bolt, and the bolt is mounted in the screw hole; still be equipped with the confession on the supporting seat the through-hole of movable block installation, the movable block is installed in the through-hole, the movable block can be followed through-hole axial displacement, the bolt with the movable block sets up relatively, through control the bolt drive the movable block is tested the sample along axial displacement. The utility model discloses a stress corrosion test device size is retrencied, and occupation space is little, and more samples can be put into simultaneously in the experiment at every turn, can make things convenient for the experimenter to use, practices thrift the cost, raises the efficiency.

Description

Stress corrosion test device

Technical Field

The utility model relates to a stress corrosion test field especially relates to a stress corrosion test device.

Background

Due to the high-temperature and high-pressure environment inside the reactor, the material exposed to severe working conditions for a long time can generate certain characteristic changes, and then the in-reactor behavior of the material is influenced. While nickel-based alloys are susceptible to Stress Corrosion Cracking (SCC), which refers to the failure, even fracture, of metallic materials in a medium under the combined action of residual stress or strain and corrosion caused by applied stress, which is typically transgranular corrosion. Meanwhile, the working principle of the grid spring leads to the inevitable existence of stress corrosion effect and failure risk, once the grid spring is broken, the grid spring loses the clamping effect on the fuel rod, the overall clamping performance of the clamping system on the fuel rod can be weakened, the flow-induced vibration and vibration abrasion effect are increased, in the worst case, the grid loses the clamping effect, and the fuel rod directly falls on the lower tube seat.

Therefore, the stress corrosion effect is a non-negligible failure phenomenon, and in order to ensure that the influence of the stress corrosion effect cannot reach an unacceptable degree and ensure the in-pile performance of the material, it is necessary to perform a stress corrosion performance test on the grid spring material and research the influence and failure rule of the effect.

In a stress corrosion test, a clamp is usually needed for preparing a sample, different types of clamps can prepare the sample in different loading modes, such as three-point loading, four-point loading and the like, the universal clamp is not stable enough for controlling the four-point loading, and the clamps in different loading modes are inconsistent and inconvenient to replace. Among the prior art, remove and fix through installing limit structure additional between rotatory bolt and sample, but this kind of limit structure spare part is more, need the installation cooperation during design, increases the operation complexity, and the relative sample of anchor clamps appearance is great, and occupation space is more.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in that, it is little to provide an occupation space, can practice thrift the cost, raises the efficiency stress corrosion test device.

The utility model provides a technical scheme that its technical problem adopted is: constructing a stress corrosion test device, which comprises a bolt, a supporting seat and a movable block;

the supporting seat is provided with a screw hole for mounting the bolt, and the bolt is mounted in the screw hole; the supporting seat is further provided with a through hole for installation of the movable block, the movable block is installed in the through hole, the movable block can be moved axially along the through hole, the bolt is arranged opposite to the movable block, and the bolt drives the movable block to test the sample along the axial movement.

Preferably, the supporting seat comprises a sample supporting part and a supporting main body, the sample supporting part is connected with the supporting main body, and a testing space is formed between the inner wall of the supporting main body and the inner wall of the sample supporting part.

Preferably, an opening for installing and moving the movable block is formed in the middle of the sample supporting portion, and the movable block enters the test space from the opening of the sample supporting portion and is installed in the through hole of the supporting main body.

Preferably, the diameter of the opening is larger than that of the movable block, so that the movable block can be mounted on the support seat.

Preferably, the screw hole and the through hole are provided on the support body, and the bolt is installed in the screw hole from the outer wall side of the support body; the movable block is installed in the through hole from one side of the inner wall of the support main body.

Preferably, a first bulge is arranged on the movable block, and a second bulge is arranged on the sample supporting part;

during the test, the sample is placed in the test space, the first protrusion is in contact with the first surface of the sample, the second protrusion is in contact with the second surface of the sample, the first surface of the sample and the second surface of the sample are opposite surfaces, and the movable block moves along the axial direction by controlling the bolt.

Preferably, the movable block comprises a movable plate, a guide post is arranged on a first side surface of the movable plate, and the first protrusion is arranged on a second side surface opposite to the first side surface of the movable plate; the guide post penetrates through the through hole and can move axially along the through hole, and the movable plate is accommodated in the test space.

Preferably, the number of the first protrusions is at least one, the number of the second protrusions is two, and the two second protrusions are respectively arranged on two sides of the first protrusions.

Preferably, the movable block is provided with scales for auxiliary measurement, and the scale lines are arranged along the outer surface of the guide post.

Preferably, one end of the bolt, which is far away from the nut, is of an arc surface shape, and the sample supporting part and the supporting main body are of an integral structure.

Implement the utility model discloses following beneficial effect has: the utility model discloses a stress corrosion test device size is retrencied, and occupation space is little, and more samples can be put into simultaneously in the experiment at every turn, can make things convenient for the experimenter to use, practices thrift the cost, raises the efficiency.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is a schematic structural diagram of the stress corrosion test apparatus of the present invention;

fig. 2 is an exploded view of the stress corrosion test apparatus of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, the embodiments of the present invention will be 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", "upper", "lower", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention, but do not indicate that the device or element referred to must have a specific direction, and thus, should not 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; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

Referring to fig. 1-2, the stress corrosion test device of the present invention comprises a bolt 1, a support base 2 and a movable block 3;

the supporting seat 2 is provided with a screw hole 221 for installing the bolt 1, the bolt 1 is installed in the screw hole 221, and the bolt 1 can be controlled to move up and down or be fixed by rotating the bolt 1 for adjusting the loading capacity of a sample; still be equipped with the through-hole 222 that supplies the movable block 3 installation on the supporting seat 2, the movable block 3 is installed in through-hole 222, and the movable block 3 can be followed through-hole 222 axial displacement, and bolt 1 sets up with the movable block 3 is relative, makes the movable block 3 along axial displacement through control bolt 1 and tests the sample. Specifically, the top of the bolt 1 can be spherical, one end of the bolt, which is far away from the nut, is cambered, and the bolt 1 pushes the movable block 3 to move, so that point contact is formed between the top of the bolt and the movable block. In some embodiments, the top of the bolt may be a table top, a circular truncated cone top, a cylinder top, or the like, so that the bolt and the movable block are in surface contact, thereby playing a role in transmitting driving force.

Further, the support base 2 includes a sample support portion 21 and a support main body 22, the sample support portion 21 is connected with the support main body 22, the sample support portion 21 is disposed below the support main body 22 and is connected by the support main body 22, and a test space is formed between an inner wall of the support main body 22 and an inner wall of the sample support portion 21.

Further, the support base 2 is C-shaped, the middle of the sample support portion 21 is provided with an opening for the movable block 3 to be mounted and moved, and the movable block 3 enters the test space from the opening of the sample support portion 21 and is mounted in the through hole 222 of the support main body 22.

Specifically, the diameter of the opening is greater than the diameter of the movable block 3, so that the movable block 3 can smoothly enter the test space, the movable block 3 can move in and out of the opening, and the movable block 3 is mounted on the support main body 22 of the support base 2 or detached from the support main body 22.

Further, the screw hole 221 and the through hole 222 are disposed on the supporting main body 22, the supporting main body 22 is provided with the screw hole 221 for mounting the bolt 1 and the through hole 222 for mounting the movable block 3, two through holes 222 are symmetrically formed at two sides of the screw hole 221 corresponding to the bolt 1, the guide column of the movable plate 32 can be allowed to freely pass through, a limiting effect is achieved, the movable plate 32 is guaranteed to move only along the axial direction of the through hole 222, and the stability during loading force is improved. The bolt 1 is installed in the screw hole 221 from the outer wall side of the support body 22; the movable block 3 is mounted in the through hole 222 from the inner wall side of the support body 22, and the bolt 1 and the movable block 3 are both mounted on the support body 22, but the mounting directions of the two are opposite.

Further, a first protrusion 31 is provided on the movable block 3, and a second protrusion 211 is provided on the sample support portion 21;

specifically, the movable block includes a movable plate 32, a first side of the movable plate 32 is provided with a guide post 33, and the first protrusion is arranged on a second side opposite to the first side of the movable plate 32; the guide post 33 is opposite to the two through holes 222, the diameter of the guide post 33 is equal to the diameter of the through hole 222, the guide post 33 is inserted into the through hole 222, and the two are tightly attached to each other, that is, the installation is completed, at this time, the movable plate 32 is accommodated in the test space 4, and the first protrusion 31 on the movable plate 32 contacts with the test sample 100. During testing, the guide post 33 can move axially along the through hole 222.

The second protrusions 211 are respectively provided on both sides of the specimen support part 21 near the opening, and a fulcrum may be provided by the second protrusions 211 contacting the specimen 100.

Further, at least one first protrusion 31 is arranged on the movable block 3, when the first protrusion 31 is arranged on the movable block 3, two second protrusions 211 are arranged on the sample supporting portion 21, and the two second protrusions 211 are respectively arranged on two sides of the first protrusion 31, so that a three-point loading test is formed.

When the movable block 3 is provided with two first protrusions 31, the sample support portion 21 is provided with two second protrusions 211, and the two second protrusions 211 are respectively disposed on two sides of the two first protrusions 31 to form a four-point loading test.

It is understood that the number of the first protrusions 31 and the second protrusions 211 may be adjusted according to actual test conditions to match the test sample loading, and the number of the first protrusions 31 and the second protrusions 211 is not particularly limited.

During the test, the test sample 100 is placed in the test space 4, the first protrusion and the second protrusion respectively act on the opposite surfaces of the test sample, the first protrusion 31 contacts with the first surface of the test sample 100, the second protrusion 211 contacts with the second surface of the test sample 100, the first surface of the test sample and the second surface of the test sample are opposite surfaces, the movable block 3 is moved up and down along the axial direction by controlling the bolt 1 to move up and down, and the adjustment of the sample loading capacity is completed under the action of the movable block 3 and the protrusions.

Furthermore, be equipped with the scale that is used for the auxiliary measuring on the movable block 3, specifically, the guide post 33 surface is equipped with annular scale mark, and the scale mark can encircle the round setting or only set up in one side along guide post 33 surface. When the bolt 1 pushes the movable block 3 out, the scales can be displayed, and the operation and recording functions of the experimenter are assisted.

Specifically, the surface of the guiding column 33 is provided with a scale, for example, by photolithography, etching, etc., and the scale can be disposed on the outward surface, i.e., the side close to the reading side, for convenient observation. The scale is increased from 0 to the top, the minimum scale is 1mm, and the scale can be directly read as a common scale. During the experiment, other measuring tools and modes, such as a vernier caliper, can be used for determining the bending distance of the test sample according to the experiment requirement. The scale is designed for assisting recording and identification, and is suitable for occasions which do not need high precision and do not influence the common distance measuring method. Because the whole design is suitable for the high-temperature high-pressure corrosion closed environment of a high-temperature reaction kettle, a batch of samples can be put into a single experiment, so that the experiment conditions are controlled to be consistent, and the scale can be used as a mark to help distinguish a plurality of samples.

The scale reading mode is illustrated as follows:

when the sample is installed in the stress corrosion test device, the movable block 3 falls down to naturally contact the sample, and the reading on the guide column 33 is recorded as a. After the drive bolt 1 has been advanced to the desired position, the sample is bent, the movable block 3 is moved downwards and the reading on the guide column 33 is recorded as b. At the moment, the parameter setting of the bending distance of the sample is roughly read as b-a, and a high-precision result can be obtained by actually measuring by using a vernier caliper or other methods.

Considering that the thickness of a batch of samples is usually the same, i.e. the readings of a can be considered very similar. Then the reading of b can be used as a marker for differentiation. If the experimenter does not conveniently mark the device, the experimenter can distinguish each sample through reading.

Further, the sample support portion 21 and the support main body 22 are of an integral structure. Supporting seat 2 is the integrated into one piece structure, and its spare part is few, and it is little to account for the space, can rationally hold the sample, and the sample of the same type generally has the fixed dimension requirement, and this anchor clamps stress corrosion test device size can be makeed as required, does not occupy extra space.

The stress corrosion test sample is generally a slender and straight metal strip, and the thickness of the strip is determined by the mechanical properties of the material and the shape of a supplied product. The test sample is generally flat and can be directly inserted into the test space 4 between the movable block 3 and the supporting seat 2 from the side of the stress corrosion experiment device. And then, pushing the movable block 3 by using the bolt 1, adjusting the sample from the just contacted state to the required loading amount, fixing the bolt 1, and finishing the preparation of the sample.

The utility model discloses a stress corrosion test device's anchor clamps are applicable to three point loading sample, four point loading sample's preparation and experiment. The stress corrosion test device and the sample are required to be placed in the high-pressure reaction kettle together in subsequent experiments, more samples of the same or different types can be placed in the stress corrosion test device simultaneously, the cost can be saved, and the efficiency can be improved. And the scales are marked on the stress corrosion test device, so that the setting of experiment parameters can be recorded in an auxiliary manner, and the device is convenient for experimenters to use.

It should be understood that the above examples only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements 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 changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A stress corrosion test device is characterized by comprising a bolt, a supporting seat and a movable block;

2. The stress-corrosion testing device of claim 1, wherein the supporting base comprises a sample supporting portion and a supporting body, the sample supporting portion is connected with the supporting body, and a testing space is formed between the inner wall of the supporting body and the inner wall of the sample supporting portion.

3. The stress-corrosion testing device of claim 2, wherein an opening for the movable block to be mounted and moved is provided in the middle of the sample support portion, and the movable block enters the testing space from the opening of the sample support portion and is mounted in the through hole of the support body.

4. The stress-corrosion testing apparatus of claim 3, wherein the diameter of said opening is larger than the diameter of said movable block for mounting said movable block on said support base.

5. The stress corrosion test apparatus according to claim 2, wherein said screw hole and said through hole are provided on said support main body, and said bolt is fitted in said screw hole from an outer wall side of said support main body; the movable block is installed in the through hole from one side of the inner wall of the support main body.

6. The stress corrosion test device according to claim 2, wherein a first protrusion is provided on the movable block, and a second protrusion is provided on the sample support portion;

during testing, the sample is placed in the testing space, the first protrusion is in contact with the first surface of the sample, the second protrusion is in contact with the second surface of the sample, the first surface of the sample and the second surface of the sample are opposite surfaces, and the movable block is enabled to move axially by controlling the bolt.

7. The stress corrosion test device according to claim 6, wherein the movable block comprises a movable plate, a first side surface of the movable plate is provided with a guide column, and the first protrusion is arranged on a second side surface opposite to the first side surface of the movable plate; the guide post penetrates through the through hole and can move axially along the through hole, and the movable plate is accommodated in the test space.

8. The stress corrosion test apparatus according to claim 7, wherein the number of the first protrusions is at least one, the number of the second protrusions is two, and the two second protrusions are respectively disposed on two sides of the first protrusions.

9. The stress corrosion test device according to claim 8, wherein scales for auxiliary measurement are arranged on the movable block, and the scales are arranged along the outer surface of the guide post.

10. The stress corrosion test device of claim 2, wherein the end of the bolt away from the nut is cambered, and the sample support part and the support body are of an integral structure.