Strip spring fatigue test device

Abstract

The present disclosure belongs to the field of nuclear power technology, and specifically relates to a strip spring fatigue test device. The present disclosure uses a pad and a test rod to press against the steel convexity and spring sheet of the strip spring, constrains the contact point between the spring and the base plate, and uses multiple pressure blocks to press against the position of one side of each spring sheet on the strip spring, which can effectively fix the strip spring and simulate the stress conditions when the strip springs overlap each other, thereby realistically simulating the real working condition constraints of the strip spring and solving the problem of being unable to test and study the overall fatigue performance of the strip spring. It can achieve simulation and testing of the real working condition of the spring, provide important theoretical guidance and technical support for studying the fatigue performance of the strip spring, and has important scientific significance and engineering application value.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to a strip spring fatigue test device. Background Art

[0002] Strip springs are widely used in the production of nuclear fuel elements and play a key supporting role. Therefore, their fatigue performance is directly related to the service life and reliability of the equipment. However, due to the special size of strip springs and the complex stress conditions during service, the current testing and research on the fatigue performance of strip springs is based on a single spring or simplified actual working conditions. With the improvement of equipment quality and service life requirements, traditional testing methods and means can no longer meet the needs of engineering applications. Therefore, there is an urgent need for suitable equipment to test the fatigue performance of the strip spring as a whole according to actual service conditions. Summary of the invention

[0003] In order to overcome the problems existing in the related art, a strip spring fatigue test device is provided.

[0004] According to one aspect of an embodiment of the present disclosure, there is provided a strip spring fatigue test device, the strip spring fatigue test device comprising: a bottom plate, a pressure plate, a test rod, a plurality of pressure blocks and a plurality of cushion blocks;

[0005] The upper surface of the bottom plate is provided with a plurality of grooves, each groove is embedded with a cushion block, and the arc-shaped upper surface of each cushion block faces the opening of the embedded groove;

[0006] The strip spring to be tested covers the plurality of strip grooves, and the upper surface of each pad is in contact with a steel convex;

[0007] The pressing plate is connected to the top of the bottom plate, and a plurality of grooves are provided on the lower surface of the pressing plate, each groove is embedded with a pressing block, and the lower surface of each pressing block is pressed against one side of the spring on the upper surface of the strip spring to be tested, and each spring is located between two pressing blocks;

[0008] The upper end of the test rod is connected to the fatigue testing machine, the pressure plate is a U-shaped frame structure, the lower end of the test rod can pass through the inner frame of the pressure plate and press against the spring sheet of each strip spring to be tested, and the fatigue testing machine is used to apply multiple preset threshold pressures to the test rod to test the fatigue pressure value of the strip spring to be tested.

[0009] In a possible implementation, the plurality of pads are divided into a plurality of groups, the pads in each group have the same height, the number of pads in each group is the same as the number of the plurality of grooves, and the pads in different groups have different heights.

[0010] In a possible implementation, the lower surface of each pressing block is a plane, and the width of the lower surface of each pressing block is smaller than the width of the upper surface of the pressing block.

[0011] In a possible implementation, the lower end of the test rod includes a plurality of pressure heads, and each pressure head can press against a spring leaf of the strip spring to be tested.

[0012] In a possible implementation manner, the pressing plate is connected to the base plate by a plurality of screws.

[0013] In a possible implementation, the pressing plate and the bottom plate are aligned by a plurality of positioning pins axially penetrating the pressing plate and the bottom plate.

[0014] In a possible implementation, a plurality of positioning grooves are provided on the edge of the strip spring to be tested, and a plurality of positioning threaded holes are provided along the axial direction on the bottom plate and the pressure plate;

[0015] The strip spring fatigue testing device also includes a plurality of positioning screws, each of which is threadedly connected in a positioning threaded hole of the base plate and a positioning threaded hole of a pressure plate, and is clamped in a positioning groove.

[0016] In a possible implementation, the curvature of the upper surface of the cushion block is consistent with the curvature of the side surface of the fuel rod.

[0017] In a possible implementation, the strip spring fatigue testing device further includes a plurality of baffles, each of which is connected to a side surface of the base plate.

[0018] In a possible implementation manner, each baffle is connected to the base plate via screws.

[0019] The beneficial effects of the present disclosure are as follows: the present disclosure uses a pad and a test rod to press against the steel convex and spring sheet of the strip spring, constrains the contact point between the spring and the bottom plate, and uses multiple pressure blocks to press against the position of one side of each spring sheet on the strip spring, which can effectively fix the strip spring and simulate the stress conditions when the strip springs overlap each other, thereby realistically simulating the real working condition constraint conditions of the strip spring and solving the problem of being unable to test and study the overall fatigue performance of the strip spring. It can achieve simulation and testing of the real working condition of the spring, provide important theoretical guidance and technical support for studying the fatigue performance of the strip spring, and has important scientific significance and engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a strip spring fatigue testing device according to an exemplary embodiment.

[0021] Figure 2 The figure is a top view of a strip spring fatigue testing device according to an exemplary embodiment. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the present disclosure, one side of the strip spring may be a steel bulge, and the other side of the strip spring opposite to the steel bulge may be a spring sheet. During the actual service of the strip spring, the steel bulge and the spring sheet of the strip spring are squeezed by different fuel rods at the same time.

[0024] Figure 1 is a schematic diagram of a strip spring fatigue test device according to an exemplary embodiment. Figure 1 As shown, the strip spring fatigue test device comprises: a base plate 2, a pressure plate 6, a test rod 4, a plurality of pressure blocks 3 and a plurality of cushion blocks 5;

[0025] like Figure 1 As shown, the bottom plate can be fixedly connected to the mobile workbench fixing frame 1, and a plurality of grooves are provided on the upper surface of the bottom plate 2, and a cushion block 5 is embedded in each groove, and the arc-shaped upper surface of each cushion block 5 faces the opening of the embedded groove;

[0026] The strip spring 10 to be tested covers a plurality of strip grooves, and the upper surface of each pad 5 contacts a steel convex 101;

[0027] The pressing plate 6 is connected to the top of the bottom plate 2. Figure 2 FIG. 1 is a top view of a strip spring fatigue test device according to an exemplary embodiment. Figure 2 As shown, the pressing plate 6 is connected to the bottom plate ( Figure 2 The pressing plate 6 and the bottom plate 2 can be connected (not shown), and the pressing plate 6 and the bottom plate 2 can be aligned by a plurality of positioning pins 7 axially penetrating the pressing plate 6 and the bottom plate 2.

[0028] like Figure 1 As shown, the lower surface of the pressing plate 6 is provided with a plurality of grooves, each groove is embedded with a pressing block 3, the lower surface of each pressing block 3 is pressed against one side of the spring sheet 100 on the upper surface of the strip spring 10 to be tested, and each spring sheet 100 is located between two pressing blocks 3;

[0029] In one possible implementation, Figure 1 As shown, the lower surface of each pressing block 3 is a plane, and the width of the lower surface of each pressing block 3 is smaller than the width of the upper surface of the pressing block 3. The stress state of the overlapping strip springs 10 to be tested can be simulated more realistically.

[0030] The upper end of the test rod 4 is connected to the fatigue testing machine, and the pressure plate 6 is a circular frame structure. The lower end of the test rod 4 can pass through the inner frame of the pressure plate 6 and press against the spring piece 100 of each strip spring 10 to be tested. The fatigue testing machine is used to apply multiple preset threshold pressures to the test rod 4 to test the fatigue pressure value of the strip spring 10 to be tested.

[0031] During the fatigue test, it is ensured that the contact surface between the grid spring and the fuel rod is subjected to positive pressure throughout the test. During the test, the grid spring is compressed to the nominal displacement, and then a certain amount of compression is applied. The grid spring is reciprocated at this position according to the cyclic load, and the number of cycles experienced when the grid spring completely breaks is recorded; if the grid spring has not broken after 1×107 load cycles, the test can be stopped.

[0032] The present invention uses a pad and a test rod to press against the steel convex and spring sheet of the strip spring to be tested, constrains the contact point between the spring and the bottom plate, and uses multiple pressure blocks to press against the position of one side of each spring sheet on the strip spring to be tested, which can effectively fix the strip spring to be tested and simulate the stress conditions when the strip springs to be tested overlap each other, thereby realistically simulating the real working condition constraints of the strip spring to be tested, and solving the problem of being unable to test and study the overall fatigue performance of the strip spring to be tested. It can simulate and test the real working conditions of the spring, provide important theoretical guidance and technical support for studying the fatigue performance of the strip spring to be tested, and has important scientific significance and engineering application value.

[0033] In a possible implementation, the plurality of pads are divided into a plurality of groups, the pads in each group have the same height, the number of pads in each group is the same as the number of the plurality of grooves, and the pads in different groups have different heights.

[0034] In a possible implementation, the lower end of the test rod includes a plurality of pressure heads, each of which can press against a spring sheet of the strip spring to be tested, thereby testing a plurality of spring sheets at the same time, thereby improving the test efficiency.

[0035] In a possible implementation, a plurality of positioning grooves are provided on the edge of the strip spring to be tested, and a plurality of positioning threaded holes are provided in the axial direction on the bottom plate and the pressure plate; the strip spring fatigue test device further comprises a plurality of positioning screws, each of which is threadedly connected in a positioning threaded hole of the bottom plate and a positioning threaded hole of the pressure plate, and is clamped in a positioning groove. In this way, the strip spring to be tested can be further fixed.

[0036] In a possible implementation, the plurality of pads are divided into a plurality of groups, the pads in each group have the same height, the number of pads in each group is the same as the number of the plurality of grooves, and the pads in different groups have different heights. In this way, different pre-deformations when the actual spring is installed can be simulated by inserting pads of different heights.

[0037] like Figure 2 As shown, the strip spring fatigue test device also includes a plurality of baffles 9, each of which is connected to a side of a bottom plate (not shown) under the pressure plate 6. This can further effectively fix the strip spring to be tested. Each baffle is connected to the bottom plate by screws.

[0038] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A strip spring fatigue test device, characterized in that: The strip spring fatigue test device comprises: a base plate, a pressure plate, a test rod, a plurality of pressure blocks and a plurality of cushion blocks; The upper surface of the bottom plate is provided with a plurality of grooves, each groove is embedded with a pad, and the arc-shaped upper surface of each pad faces the opening of the embedded groove; The strip spring to be tested covers the plurality of strip grooves, and the upper surface of each pad is in contact with a steel convex; The pressing plate is connected to the top of the bottom plate, and a plurality of grooves are provided on the lower surface of the pressing plate, each groove is embedded with a pressing block, and the lower surface of each pressing block is pressed against one side of the spring on the upper surface of the strip spring to be tested, and each spring is located between two pressing blocks; The upper end of the test rod is connected to the fatigue testing machine, the pressure plate is a U-shaped frame structure, the lower end of the test rod can pass through the inner frame of the pressure plate and press against the spring sheet of each strip spring to be tested, and the fatigue testing machine is used to apply multiple preset threshold pressures to the test rod to test the fatigue pressure value of the strip spring to be tested.

2. The strip spring fatigue testing device according to claim 1, characterized in that: The plurality of pads are divided into a plurality of groups, the pads in each group have the same height, the number of pads in each group is the same as the number of the plurality of grooves, and the pads in different groups have different heights.

3. The strip spring fatigue testing device according to claim 1, characterized in that: The lower surface of each pressing block is a plane, and the width of the lower surface of each pressing block is smaller than the upper surface of the pressing block.

4. The strip spring fatigue testing device according to claim 1, characterized in that: The lower end of the test rod includes a plurality of pressure heads, each of which can press against a spring leaf of the strip spring to be tested.

5. The strip spring fatigue testing device according to claim 1, characterized in that: The pressing plate is connected to the bottom plate through a plurality of screws.

6. The strip spring fatigue testing device according to claim 1, characterized in that: A plurality of positioning grooves are provided on the edge of the strip spring to be tested, and a plurality of positioning threaded holes are provided along the axial direction on the bottom plate and the pressure plate; The strip spring fatigue testing device also includes a plurality of positioning screws, each of which is threadedly connected in a positioning threaded hole of the base plate and a positioning threaded hole of a pressure plate, and is clamped in a positioning groove.

7. The strip spring fatigue testing device according to claim 1, characterized in that: The curvature of the upper surface of the pad and the curvature of the lower surface of the test rod are consistent with the curvature of the side surface of the fuel rod.

8. The strip spring fatigue testing device according to claim 1, characterized in that: The strip spring fatigue testing device further comprises a plurality of baffles, each of which is connected to a side surface of the base plate.

9. The strip spring fatigue testing device according to claim 8, characterized in that: Each baffle is connected to the bottom plate by screws.

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