CN219224350U

CN219224350U - Micro-motion test device

Info

Publication number: CN219224350U
Application number: CN202222931828.1U
Authority: CN
Inventors: 蔡振兵; 王俊; 李好杰; 王浩宇; 张晓宇; 方修洋
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-06-20
Anticipated expiration: 2032-11-03

Abstract

The utility model discloses a micro-motion test device, which comprises a top plate and a bottom plate; the front part of the top plate and the bottom plate are fixedly connected through a plurality of guide posts; the center of the top plate is provided with an opening, and a normal loading assembly is arranged at the opening; an upper clamp is connected below the normal loading assembly; the bottom plate is provided with a positioning sliding block for fixing the lower clamp; one end of the positioning slide block is connected with the tangential loading assembly. The device is provided with the normal record combination and the tangential loading assembly, can perform independent tangential or normal loading, and can also perform normal and tangential fretting wear tests simultaneously.

Description

Micro-motion test device

Technical Field

The utility model belongs to the technical field of fretting wear tests, and particularly relates to a fretting test device.

Background

In Pressurized Water Reactors (PWR), fretting wear (GTRF) between the clamping grid and the fuel rods is one of the primary causes of fuel assembly failure. Nuclear power equipment is extremely demanding on the environment and generally operates at high temperature, high pressure and high flow rates of coolant. The fuel rod is a core component in the whole nuclear power reactor and mainly comprises a fuel core and cladding tubes, wherein the cladding tubes are clamped by springs and rigid projections on a grid, and when the reactor runs, coolant flows through the surface of the fuel cladding tubes from bottom to top along the direction of the fuel rod, and the fuel rod in the fuel rod is disturbed to generate slight vibration due to high flow velocity, so that fretting friction and wear are generated near the contacts of the grid springs, the rigid projections and the cladding tube, and the fuel rod is damaged and radioactive products leak when severe, thereby affecting the safe running of the nuclear power plant, and therefore, the fretting friction and wear performance of the fuel cladding needs to be fully studied.

Based on the above, the fretting wear behavior of each key component is studied deeply, the performance and the service life of the key component can be evaluated and estimated, and the safe operation of the nuclear power station is facilitated. Most of the conventional fretting wear test devices only can perform a single tangential fretting wear test, cannot perform a normal fretting wear test (i.e., an impact test), cannot meet the requirements of various wear tests, and is not beneficial to comprehensively evaluating the performance of products.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a fretting test device so as to solve the problem that the conventional fretting wear test device cannot perform normal fretting wear test.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a micro-motion test device comprises a top plate and a bottom plate; the front part of the top plate and the bottom plate are fixedly connected through a plurality of guide posts; the center of the top plate is provided with an opening, and a normal loading assembly is arranged at the opening; an upper clamp is connected below the normal loading assembly; the bottom plate is provided with a positioning sliding block for fixing the lower clamp; one end of the positioning slide block is connected with the tangential loading assembly.

Further, the upper end and the lower end of the guide post are provided with external threads; the top plate is positioned at the upper ends of the plurality of guide posts, and is fixed at the upper ends of the guide posts through the threaded cooperation of the plurality of hexagonal thin nuts and the guide posts; the bottom plate is provided with a plurality of threaded holes, the external threads of the guide posts are in threaded connection with the threaded holes, and the bottom plate is fixedly connected with the bottoms of the guide posts through a plurality of hexagonal thin nuts.

Further, the normal loading assembly comprises a plurality of weights, a weight guide post for fixing the weights and a pressure-bearing sliding block; one end of the pressure-bearing sliding block passes through the central opening of the top plate and is connected with the upper clamp; the other end of the pressure-bearing sliding block is provided with an opening, and the weight guide post is vertically inserted into the opening.

Further, the upper clamp comprises a clamping plate; the clamping plate is used for fixing the upper sample at the lower end of the pressure-bearing sliding block through a plurality of compression ring bolts.

Further, the lower clamp is fixed on the positioning slide block through a plurality of bolts; the lower clamp is in a convex shape, and a groove for accommodating a lower sample is formed in the top of the convex shape.

Further, the tangential loading assembly comprises a linear servo motor; the free end of the output shaft of the linear servo motor is fixedly connected with one surface of the transmission plate, and the opposite surface of the transmission plate is fixed on the positioning slide block through a plurality of bolts.

Further, the linear servo motor is fixed on a base, and a displacement sensor is arranged on the base.

Further, a force sensor is arranged at one end, far away from the positioning sliding block, of the output shaft of the linear servo motor.

Further, the linear servo motor, the force sensor and the displacement sensor are all electrically connected with an external upper computer.

The micro-motion test device provided by the utility model has the following beneficial effects:

the utility model is provided with the normal record combination and the tangential loading assembly, can carry out independent tangential or normal loading, and can also carry out normal and tangential fretting wear tests simultaneously.

The normal loading component of the utility model adopts weights to apply normal force, can stably load 0-200N normal load, has simple structure and convenient operation, and simultaneously has more visual and controllable applied normal load compared with the traditional motor drive.

Drawings

FIG. 1 is a schematic diagram of a micro-motion test apparatus.

FIG. 2 is a schematic structural view of a tangential loading assembly of a micro-testing device.

17, a weight guide post; 18. a weight; 19. a pressure-bearing slide block; 20. a guide post; 21. a hexagonal thin nut; 22. a top plate; 23. positioning a sliding block; 24. a lower clamp; 25. a compression ring bolt; 26. clamping plates are arranged; 27. loading a sample; 28. a lower sample; 29. a bottom plate; 30. a linear servo motor; 31. an output shaft; 32. a force sensor.

Detailed Description

The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.

Example 1

Referring to fig. 1, the micro-motion test device of the present embodiment may perform normal load loading and tangential load loading simultaneously, and specifically includes:

a normal loading assembly and a tangential loading assembly, wherein the normal loading assembly is mounted on a support structure consisting of a bottom plate 29 and a top plate 22.

The supporting structure specifically includes a bottom plate 29, a top plate 22 and a plurality of guide posts 20, wherein the upper ends and the lower ends of the plurality of guide posts 20 are provided with external threads, as shown in fig. 1, the top plate 22 is fixed at the upper ends of the plurality of guide posts 20, specifically, the top of the guide post 20 passes through a hole on the top plate 22, and the positions of the top plate 22 are fixed by adopting a plurality of hexagonal thin nuts 21, namely, the top is fixed at the upper parts of the plurality of guide posts 20.

The bottom plate 29 is provided with a plurality of threaded holes, the lower part of the guide post 20 is inserted into the threaded holes, external threads on the guide post 20 are in threaded connection with the threaded holes, and the bottom plate 29 is fixedly connected with the bottom of the guide post 20 through a plurality of hexagonal thin nuts 21.

The center of the top plate 22 is provided with a hole, a normal loading assembly is arranged at the hole, and an upper clamp is connected below the normal loading assembly and is used for clamping an upper sample 27; the normal loading assembly is for providing a normal loading load.

The positioning slide block 23 is fixed on the bottom plate 29, and the positioning slide block 23 and the bottom plate 29 can be fixed by bolts or other modes; one end of the positioning slider 23 is connected to a tangential loading assembly for providing tangential loading.

The lower clamp 24 is fixed on the positioning slide block 23 through a plurality of bolts, the lower clamp 24 is in a convex shape, and a groove for accommodating the lower sample 28 is formed at the top of the convex shape.

The upper sample 27 of the present embodiment may be a plate-like structure such as a lattice; the lower test specimen 28 may be a tubular structure, such as a fuel rod, and the lattice and fuel rod are subjected to fretting wear testing and applied with normal and tangential loads.

Since the fuel rod has a tubular structure with a certain length, the fuel rod may be fixed in the groove of the lower clamp 24 by using a bead and a bolt for auxiliary fixation.

Example 2

Referring to fig. 1, the present embodiment provides a normal loading assembly with a simple structure and convenient operation, which specifically includes:

a plurality of weights 18, a weight guide post 20 for fixing the plurality of weights 18, and a pressure-bearing slider 19;

specifically, one end of the pressure-bearing slide block 19 passes through the central opening of the top plate 22 and is connected with the upper clamp, the other end of the pressure-bearing slide block 19 is provided with an opening, and the weight guide post 17 is vertically inserted in the opening.

The upper clamp includes a clamping plate 26, and the clamping plate 24 fixes an upper sample 27 to the lower end of the pressure-bearing slider 19 through a plurality of compression ring bolts 25.

During specific operation, an upper sample 27 is fixed on a clamping plate 26 through a compression ring bolt 25, and the clamping plate 26 is fixed at the lower end of a pressure-bearing slide block 19 by matching with a bolt; when normal load loading is performed, the normal load is configured according to the number of weights 18, and a plurality of weights 18 are directly inserted into the weight guide posts 17, and the weight guide posts 17 transmit the normal force to the pressure-bearing slide blocks 19, so that the normal load is loaded on the upper sample 27.

Example 3

The present embodiment provides a tangential recording assembly for providing driving force by a motor, which specifically includes:

the tangential loading assembly comprises a linear servo motor 30, the free end of an output shaft 31 of the linear servo motor 30 is fixedly connected with one surface of a transmission plate, and the opposite surface of the transmission plate is fixed on the positioning slide block 23 through a plurality of bolts.

The power of the linear servo motor 30 drives the vibration between the upper specimen 27 and the lower specimen 28 by 1-30Hz through the transmission of the output shaft 31, i.e., the linear motion of the linear servo motor 30 acts on the positioning slider 23 to give the upper specimen 27 and the lower specimen 28 lateral load.

The linear servo motor 30 is fixed on a base, a displacement sensor or a grating ruler sensor is arranged on the base to detect the controllable inching amplitude of the linear servo motor 30, the controllable inching amplitude is +/-1 mu m to +/-1000 mu m, a displacement signal detected by the displacement sensor is sent back to an upper computer, and if the amplitude deviates from a set value, the output power of the linear servo motor is adjusted to calibrate the displacement, so that the displacement is kept stable in the whole experimental process.

A force sensor 32 is mounted on the output shaft 31 of the linear servo motor 30 at the end remote from the positioning slide 23,

the linear servo motor 30, the force sensor 32 and the displacement sensor are all electrically connected with an external upper computer, and the upper computer is preferably a computer, so that the control of the linear servo motor 30 can be performed based on the real-time data of the force sensor 32 and the displacement sensor.

Although specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, it should not be construed as limiting the scope of protection of the present patent. Various modifications and variations which may be made by those skilled in the art without the creative effort are within the scope of the patent described in the claims.

Claims

1. A micro-motion test device is characterized in that: comprises a top plate and a bottom plate; the front parts of the top plate and the bottom plate are fixedly connected through a plurality of guide posts; the center of the top plate is provided with an opening, and a normal loading assembly is arranged at the opening; an upper clamp is connected below the normal loading assembly; the bottom plate is provided with a positioning sliding block for fixing the lower clamp; one end of the positioning sliding block is connected with the tangential loading assembly.

2. The micro-motion test device according to claim 1, wherein: external threads are formed at the upper end and the lower end of the guide post; the top plate is positioned at the upper ends of the plurality of guide posts, and is fixed at the upper ends of the guide posts through the threaded cooperation of the plurality of hexagonal thin nuts and the guide posts; the bottom plate is provided with a plurality of threaded holes, the external threads of the guide posts are in threaded connection with the threaded holes, and the bottom plate is fixedly connected with the bottoms of the guide posts through a plurality of hexagonal thin nuts.

3. The micro-motion test device according to claim 1, wherein: the normal loading assembly comprises a plurality of weights, weight guide posts for fixing the weights and a pressure-bearing sliding block; one end of the pressure-bearing sliding block penetrates through the center opening of the top plate and is connected with the upper clamp; the other end of the pressure-bearing sliding block is provided with an opening, and the weight guide post is vertically inserted into the opening.

4. The micro-motion test device according to claim 3, wherein: the upper clamp comprises a clamping plate; the clamping plate is used for fixing an upper sample at the lower end of the pressure-bearing sliding block through a plurality of compression ring bolts.

5. The micro-motion test device according to claim 1, wherein: the lower clamp is fixed on the positioning slide block through a plurality of bolts; the lower clamp is in a convex shape, and a groove for accommodating a lower sample is formed in the top of the convex shape.

6. The micro-motion test device according to claim 5, wherein: the tangential loading assembly comprises a linear servo motor; the free end of the linear servo motor output shaft is fixedly connected with one surface of the transmission plate, and the opposite surface of the transmission plate is fixed on the positioning sliding block through a plurality of bolts.

7. The micro-motion test device of claim 6, wherein: the linear servo motor is fixed on the base, and the displacement sensor is arranged on the base.

8. The micro-motion test device of claim 7, wherein: and a force sensor is arranged at one end, far away from the positioning sliding block, of the output shaft of the linear servo motor.

9. The micro-motion test device of claim 8, wherein: the linear servo motor, the force sensor and the displacement sensor are all electrically connected with an external upper computer.