Spring static load fatigue strength testing device

Abstract

The utility model discloses a spring static load fatigue strength testing device, which comprises a mounting rack, a lifting assembly and a measuring scale, and is characterized in that the mounting rack comprises a bottom plate and a top plate, and the top plate is provided with a through hole; the lifting assembly comprises a base, a connecting rod, a limiting piece, a driving piece and a pressure sensor. A limiting groove is formed in the base; one end of the connecting rod is fixedly connected with the base, the other end of the connecting rod extends out of the through hole, and the limiting piece is installed on the part, protruding out of the top plate, of the connecting rod. The driving piece is installed on the top plate and used for driving the connecting rod to move up and down in the axial direction. The pressure sensor is arranged between the limiting piece and the driving end of the driving piece and is used for measuring the compression force value of the tested spring; the measuring scale is installed on the installation frame and used for measuring the compression amount of the measured spring. In the static load fatigue strength test period, the tested spring does not need to be installed on a spring checking machine, and the working time of the spring checking machine is not occupied; the device is reasonable in structure, small in friction coefficient and reliable in test result.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a spring static load fatigue strength testing device. Background Art

[0002] The purpose of the spring static load fatigue test is to measure the static load fatigue strength of the spring. Generally, the spring is placed under compression by applying an external force to the spring for a period of time. The spring compression is usually performed on a spring testing machine, which generally requires long-term continuous compression, resulting in high static load testing costs. Utility Model Content

[0003] The utility model provides a spring static load fatigue strength testing device, which comprises:

[0004] A mounting frame, the mounting frame comprising a bottom plate and a top plate arranged opposite to each other, the top plate being provided with a through hole, and an accommodation space for accommodating a spring to be tested being defined between the bottom plate and the top plate;

[0005] A lifting assembly, the lifting assembly comprising a base, a connecting rod, a limiter, a driving member and a pressure sensor; the base is located in the accommodating space, and the base is provided with a limiter groove for partially accommodating the spring to be tested; one end of the connecting rod is fixedly connected to the base, and the other end of the connecting rod extends out of the through hole, and the limiter is installed on the part of the connecting rod protruding from the top plate; the driving member is installed on the top plate, and is used to drive the connecting rod to move up and down along the axial direction; the pressure sensor is installed between the limiter and the driving end of the driving member, and is used to measure the compression force value of the spring to be tested;

[0006] A measuring ruler is mounted on the mounting frame and is used to measure the compression amount of the spring being measured.

[0007] In some embodiments, the mounting frame further includes a plurality of support columns, and the plurality of support columns connect the bottom plate and the top plate.

[0008] In some embodiments, the mounting frame further includes a fixing member, and the fixing member is used to fix the top plate on the supporting column.

[0009] In some embodiments, the support column is detachably connected to the base plate.

[0010] In some embodiments, the support column includes a first columnar portion and a second columnar portion axially connected, the outer diameter of the first columnar portion is larger than the outer diameter of the second columnar portion, the first columnar portion is connected to the bottom plate, and the top plate is connected to the second columnar portion.

[0011] In some embodiments, the mounting bracket further comprises a sleeve, the inner diameter of the sleeve is smaller than the outer diameter of the first columnar portion and the inner diameter of the sleeve is larger than the outer diameter of the second columnar portion;

[0012] The sleeve is used to be sleeved on a portion of the outer circumference of the second columnar portion, the top plate is installed on the second columnar portion and the bottom surface of the top plate abuts against the upper end surface of the sleeve.

[0013] In some embodiments, the connecting rod is coaxially arranged with the base.

[0014] In some embodiments, the base includes a bottom wall and a peripheral wall extending from an upper surface of the bottom wall, and the bottom wall and the peripheral wall define the limiting groove;

[0015] One end of the connecting rod is fixedly connected to the bottom wall.

[0016] In some embodiments, the lower surface of the bottom wall is further provided with a convex portion;

[0017] The bottom plate is also provided with a recessed portion for limiting the convex portion.

[0018] In some embodiments, the driving member comprises a pneumatic cylinder or a hydraulic cylinder.

[0019] The implementation of the utility model includes the following beneficial effects: the application of the spring static load fatigue strength testing device can ensure that the tested spring is reliably fixed, and can effectively avoid the tested spring from falling out during the static load fatigue test; during the static load fatigue strength test, the tested spring does not need to be installed on the spring testing machine, and does not occupy the working time of the spring testing machine; the structure is reasonable, the friction coefficient is small, and the test results are reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the utility model, the utility model 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 utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 It is a structural schematic diagram of a spring static load fatigue strength testing device in some embodiments of the utility model;

[0022] Figure 2 yes Figure 1 Detail of the rig for testing the spring's static fatigue strength. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods 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", "rear", "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 include a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0024] 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 utility model can be understood according to the specific circumstances.

[0025] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0026] See also Figure 1 and Figure 2 The utility model shows a spring static load fatigue strength testing device, which includes a mounting frame 10, a lifting assembly 20, and a measuring scale 30.

[0027] The mounting frame 10 includes a bottom plate 11 and a top plate 12 that are disposed opposite to each other. The top plate 12 is provided with a through hole 12 a. An accommodating space A for accommodating the spring 100 to be tested is defined between the bottom plate 11 and the top plate 12 .

[0028] The lifting assembly 20 includes a base 21, a connecting rod 22, a limit member 23, a driving member 24 and a pressure sensor 25; the base 21 is located in the accommodating space A, and the base 21 is provided with a limit groove B for partially accommodating the spring 100 to be tested; one end of the connecting rod 22 is fixedly connected to the base 21, and the other end of the connecting rod 22 extends out of the through hole 12a, and the limit member 23 is installed on the part of the connecting rod 22 protruding from the top plate 12; the driving member 24 is installed on the top plate 12, and is used to drive the connecting rod 22 to move up and down along the axial direction; the pressure sensor 25 is installed between the limit member 23 and the driving end of the driving member 24, and is used to measure the compression force value of the spring 100 to be tested.

[0029] The measuring scale 30 is mounted on the mounting frame 10 and is used to measure the compression of the spring 100 being measured.

[0030] The application of the spring static load fatigue strength testing device is as follows: the spring 100 to be tested is installed in the base 21. When the driving member 24 is started, the torque can be transmitted to the connecting rod 22 through the limit member 23, driving the connecting rod 22 to move upward in the axial direction (or height direction or longitudinal direction), and the connecting rod 22 drives the base 21 to move axially. At this time, the spring 100 to be tested is located between the base 21 and the top plate 12 and is compressed. The pressure sensor 25 can measure the compressive elastic force of the spring 100 to be tested, and the measuring scale 30 can measure the compression amount of the spring 100 to be tested, thereby realizing the spring static load fatigue strength test.

[0031] In some embodiments, the upper and lower surfaces of the bottom plate 11 are both planes, and the upper and lower surfaces of the top plate 12 are both planes, so that the upper portion of the tested spring 100 contacts the lower portion of the top plate 12 more smoothly.

[0032] A through hole 12a is provided in the middle of the top plate 12, and the axis of the through hole 12a can be on the axis of the entire top plate 12. The aperture of the through hole 12a of the top plate 12 is slightly larger than the outer diameter of the connecting rod 22, so that the connecting rod 22 can move smoothly in the through hole 12a to avoid friction and test errors. At the same time, the aperture of the through hole 12a of the top plate 12 is slightly larger than the outer diameter of the connecting rod 22, which can avoid the connecting rod 22 from shaking greatly when moving up and down due to the large gap between the outer periphery of the connecting rod 22 and the inner surface of the through hole 12a.

[0033] In some embodiments, the mounting frame 10 further includes a plurality of support columns 13, which connect the bottom plate 11 and the top plate 12. The plurality of support columns 13 may include two, three or any other number. For example, the number of the support columns 13 may be two, and the two support columns 13 are symmetrically arranged and connect the bottom plate 11 and the top plate 12. The height of the support columns 13 may be selected according to the size and compression amount of the spring 100 to be tested, so as to adapt to springs 100 of different sizes to improve applicability.

[0034] In some embodiments, the support column 13 is detachably connected to the base plate 11. For example, the base plate 11 may be provided with a fixing hole 11a, and the bottom of the support column 13 is threadedly fixed to the fixing hole 11a. Thus, the support column 13 of different heights can be replaced as needed.

[0035] In some embodiments, the mounting frame 10 further includes a fixing member 14, which is used to fix the top plate 12 on the support column 13. The top plate 12 may be provided with a mounting hole 12b so that the mounting hole 12b can be sleeved on the support column 13. The fixing member 14 may be a nut, which is locked on the support column 13 and pressed against the upper surface of the top plate 12 to limit the position of the top plate 12. Alternatively, the fixing member 14 may be a clamp, which is locked on the support column 13 and pressed against the upper surface of the top plate 12 to limit the position of the top plate 12.

[0036] In some embodiments, the support column 13 may include an axially connected first columnar portion 131 and a second columnar portion 132, the outer diameter of the first columnar portion 131 is larger than the outer diameter of the second columnar portion 132, the first columnar portion 131 is connected to the bottom plate 11, and the top plate 12 is connected to the second columnar portion 132. Since the outer diameter of the first columnar portion 131 is larger than the outer diameter of the second columnar portion 132, the connection between the first columnar portion 131 and the second columnar portion 132 forms a bearing surface, and the top plate 12 can be installed on the bearing surface and then fixed by a fixing member 14. The bearing surface can be a plane, which can improve the parallelism between the bottom plate 11 and the top plate 12.

[0037] In some embodiments, the mounting bracket 10 may further include a sleeve 15 , the inner diameter of the sleeve 15 is smaller than the outer diameter of the first columnar portion 131 and the inner diameter of the sleeve 15 is larger than the outer diameter of the second columnar portion 132 .

[0038] The axial dimension (height dimension) of the sleeve 15 can be larger than the axial dimension (height dimension) of the second columnar portion 132. Thus, the sleeve 15 can be used to be sleeved on a portion of the outer circumference of the second columnar portion 132. The top plate 12 is installed on the second columnar portion 132 and the bottom surface of the top plate 12 abuts against the upper end surface of the sleeve 15. The top plate 12 can then be fixed by the fixing member 14. Therefore, sleeves 15 of different sizes can be selected and installed on the second columnar portion 132 according to actual needs to improve the applicability of the mounting frame 10.

[0039] Preferably, the second columnar portion 132 may be cylindrical, and the sleeve 15 may be cylindrical.

[0040] In some embodiments, the connecting rod 22 is coaxially arranged with the base 21, and the spring 100 to be tested may include but is not limited to a helical cylindrical spring and a disc spring. When the spring 100 to be tested is a helical cylindrical spring, the connecting rod 22 is passed through the inner cavity of the spring 100 to be tested. At this time, the connecting rod 22 is coaxially arranged with the base 21, which can make the compression of the spring 100 to be tested more accurate.

[0041] In some embodiments, the base 21 may include a bottom wall 211 and a peripheral wall 212 extending from the upper surface of the bottom wall 211. The bottom wall 211 and the peripheral wall 212 define a limit groove B. The peripheral wall 212 can circumferentially limit the spring 100 under test. When it is necessary to measure springs 100 under test of different sizes, bases 21 of different sizes can be used as needed. The limit grooves B of bases 21 of different sizes can be the same or different.

[0042] One end of the connecting rod 22 (which can be regarded as the lower end of the connecting rod 22) is fixedly connected to the bottom wall 211. Preferably, one end of the connecting rod 22 and the bottom wall 211 can be threadedly connected. For example, the lower end of the connecting rod 22 is provided with a threaded portion, and the middle portion of the bottom wall 211 can be provided with a threaded groove 211a, and the two are threadedly connected and fixed. Of course, the connecting rod 22 can also be an integral structure with the base 21.

[0043] In some embodiments, a protrusion 213 is further provided on the lower surface of the bottom wall 211, and a recess 11b is further provided on the bottom plate 11 for limiting the protrusion 213. The protrusion 213 and the recess 11b can form a guiding structure. When the base 21 moves up and down, the recess 11b can guide and limit the protrusion 213 to a certain extent to prevent the base 21 from shifting. In addition, when the spring static load fatigue strength testing device is assembled, the recess 11b can limit the protrusion 213 to a certain extent to prevent the base 21 from shifting and affecting the assembly efficiency.

[0044] In some embodiments, the outer periphery of the upper part of the connecting rod 22 may be provided with an external thread, and the limit member 23 may be a fastening nut, which can be installed at the external thread of the connecting rod 22, and the two are threadedly fixed. The pressure sensor 25 can be fixed on the side of the limit member 23 facing the top plate 12, and the driving end of the driving member 24 can be connected to the pressure sensor 25. By applying force to the pressure sensor 25, force is applied to the limit member 23 through the pressure sensor 25, and then a driving force is applied to the connecting rod 22 through the limit member 23. The driving force finally becomes the load of the spring 100 under test.

[0045] In some embodiments, the driving member 24 includes a pneumatic cylinder or a hydraulic cylinder. For example, the driving member 24 may be a hydraulic cylinder, which may be connected to a driving machine (e.g. Figure 1 As shown). Understandably, the spring is compressed by the hydraulic cylinder, which has high stability and safety.

[0046] In some embodiments, the lower end of the measuring scale 30 may be fixed to the bottom plate 11 , and the zero point position of the measuring scale 30 may be aligned with the lower surface of the base 21 .

[0047] In some embodiments, the measuring scale 30 can be provided in multiple numbers, for example, two, three or any other number, and multiple measuring scales 30 can be compared with each other, or finally the average value of the measurement data of multiple measuring scales 30 can be taken as the compression amount of the measuring spring 100 to improve the measurement accuracy. In addition, the display value of the measuring scale 30 can be the same as the height of the measuring spring 100, effectively avoiding over-compression of the measuring spring 100.

[0048] In this embodiment, the spring static load fatigue strength testing device is assembled as follows:

[0049] The support column 13 is connected and fixed to the bottom plate 11. As needed, a sleeve 15 can be added and installed on the support column 13. The base 21 is placed in the accommodating space A. The connecting rod 22 is connected to the base 21. The spring 100 to be tested is placed on the base 21. Then the through hole 12a of the top plate 12 is sleeved on the connecting rod 22. The upper part of the connecting rod 22 protrudes from the top plate 12. The fixing member 14 fixes the top plate 12 on the support column 13. The driving member 24 is installed on the top plate 12. The limiting member 23 is fixed to the connecting rod 22. The pressure sensor 25 can be fixed on the bottom surface of the limiting member 23. The driving end of the driving member 24 can be connected to the pressure sensor 25.

[0050] The application of the spring static load fatigue strength test device is as follows: after all components are installed, the driving member 24 applies force to the pressure sensor 25, and then applies force to the limit member 23 through the pressure sensor 25, and then applies driving force to the connecting rod 22 through the limit member 23. The driving force finally becomes the load of the spring 100 under test, wherein the spring 100 under test is located between the base 21 and the top plate 12 and is compressed, the pressure sensor 25 can measure the compressive elastic force of the spring 100 under test, and the measuring scale 30 can measure the compression amount of the spring 100 under test, thereby realizing the spring static load fatigue strength test.

[0051] The spring static load fatigue strength testing device has the following technical effects:

[0052] 1. The tested spring 100 is reliably fixed, which can effectively prevent the tested spring 100 from coming out during the static load fatigue test;

[0053] 2. During the static load fatigue strength test, the tested spring 100 does not need to be installed on the spring tester, and does not occupy the working time of the spring tester;

[0054] 3. Reasonable structure, small friction coefficient and reliable test results;

[0055] 4. Wide application range, applicable to tested springs 100 of various sizes (including but not limited to helical columnar springs and disc springs).

[0056] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A spring static load fatigue strength testing device, characterized in that: include: A mounting frame (10), the mounting frame (10) comprising a bottom plate (11) and a top plate (12) arranged opposite to each other, the top plate (12) being provided with a through hole (12a), and an accommodation space (A) for accommodating a spring (100) to be tested therein being defined between the bottom plate (11) and the top plate (12); A lifting assembly (20), the lifting assembly (20) comprising a base (21), a connecting rod (22), a limiting member (23), a driving member (24) and a pressure sensor (25); the base (21) is located in the accommodating space (A), the base (21) is provided with a limiting groove (B) for partially accommodating the spring (100) to be tested; one end of the connecting rod (22) is fixedly connected to the base (21), the other end of the connecting rod (22) extends out of the through hole (12a), the limiting member (23) is installed on the portion of the connecting rod (22) protruding from the top plate (12); the driving member (24) is installed on the top plate (12) and is used to drive the connecting rod (22) to move up and down along the axial direction; the pressure sensor (25) is installed between the limiting member (23) and the driving end of the driving member (24) and is used to measure the compression force value of the spring (100) to be tested; A measuring scale (30), the measuring scale (30) being mounted on the mounting frame (10) and used for measuring the compression amount of the spring (100) being measured.

2. The spring static load fatigue strength testing device according to claim 1, characterized in that: The mounting frame (10) further comprises a plurality of support columns (13), wherein the plurality of support columns (13) connect the bottom plate (11) and the top plate (12).

3. The spring static load fatigue strength testing device according to claim 2, characterized in that: The mounting frame (10) further comprises a fixing member (14), wherein the fixing member (14) is used to fix the top plate (12) on the supporting column (13).

4. The spring static load fatigue strength testing device according to claim 2, characterized in that: The support column (13) is detachably connected to the bottom plate (11).

5. The spring static load fatigue strength testing device according to claim 2, characterized in that: The support column (13) comprises a first columnar portion (131) and a second columnar portion (132) which are axially connected, the outer diameter of the first columnar portion (131) is greater than the outer diameter of the second columnar portion (132), the first columnar portion (131) is connected to the bottom plate (11), and the top plate (12) is connected to the second columnar portion (132).

6. The spring static load fatigue strength testing device according to claim 5, characterized in that: The mounting frame (10) further comprises a sleeve (15), wherein the inner diameter of the sleeve (15) is smaller than the outer diameter of the first columnar portion (131) and the inner diameter of the sleeve (15) is larger than the outer diameter of the second columnar portion (132); The sleeve (15) is used to be sleeved on a portion of the outer circumference of the second columnar portion (132); the top plate (12) is installed on the second columnar portion (132) and the bottom surface of the top plate (12) abuts against the upper end surface of the sleeve (15).

7. The spring static load fatigue strength testing device according to claim 1, characterized in that: The connecting rod (22) is coaxially arranged with the base (21).

8. The spring static load fatigue strength testing device according to claim 7, characterized in that: The base (21) comprises a bottom wall (211) and a peripheral wall (212) extending from the upper surface of the bottom wall (211), and the bottom wall (211) and the peripheral wall (212) define the limiting groove (B); One end of the connecting rod (22) is fixedly connected to the bottom wall (211).

9. The spring static load fatigue strength testing device according to claim 8, characterized in that: The lower surface of the bottom wall (211) is also provided with a convex portion (213); The bottom plate (11) is also provided with a recessed portion for limiting the position of the protruding portion (213).

10. The spring static load fatigue strength testing device according to claim 1, characterized in that: The driving member (24) comprises a pneumatic cylinder or a hydraulic cylinder.

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