Hollow threaded connection type small punch test fixture fixing base

Abstract

The utility model provides a hollow threaded connection type small punch test fixture fixing base, which relates to the technical field of material mechanical property testing and comprises a fixture base and a base locking head which are coaxially arranged. The clamp base is of a hollow cylinder structure with an open top, the inner wall of the upper part of the clamp base is provided with an internal thread for connecting a small punch test clamp, and the outer side of the lower part is provided with a radially protruding annular fixing table; at least one observation window is formed in the side wall of the cylinder of the clamp base; the clamp base is sleeved with the base locking head, and the inner wall of the base locking head is provided with a locking thread used for being connected with a testing machine body; when the base locking head is screwed, the upper end face of the base locking head presses the surface of the annular fixing table so as to lock the clamp base, and the device is compact in structural design, small in size, light in weight and suitable for small punch testing machines of various models; the mounting and dismounting processes are simple and fast, no special tool is needed, and the test efficiency is remarkably improved; and the method has good universality and expansibility.

Description

Technical Field

[0001] This utility model belongs to the field of material mechanical property testing technology, and more specifically, it relates to a hollow threaded connection type small punch rod test fixture fixing base. Background Technology

[0002] Small punch testing is an important micro-sample mechanical testing technique that evaluates the tensile, creep, and fatigue properties of materials using tiny samples. It plays an irreplaceable role in the life assessment of critical materials in fields such as nuclear power and aerospace.

[0003] With technological advancements, the demand for fatigue tests involving bidirectional reciprocating loading of small punch specimens is growing in order to more realistically simulate the alternating loads experienced by components in actual service. These tests require testing machines to apply loads not only above the specimen but also to have independent loading capabilities below it. This fundamental change has led to the failure of traditional fixture mounting methods.

[0004] In traditional unidirectional (top-loading only) small punch testing machines, the lower part is typically a simple rigid support rod, with the test fixture directly fitted and fixed to this support rod through a central hole at its bottom. However, in bidirectional loading tests, this lower position must be occupied by a movable loading rod to perform downward or upward movements. This means the fixture loses its direct physical foundation for mounting. Simply fixing the fixture to the testing machine base would completely block the movement path of the lower loading rod, making bidirectional loading impossible.

[0005] Therefore, existing technologies lack a dedicated structure that can provide a free movement path for the lower loading rod while simultaneously securing and accurately mounting the test fixture onto the testing machine. This bottleneck limits the effective implementation and application of the bidirectional loading small punch test method. Utility Model Content

[0006] The purpose and effect of this utility model, a hollow threaded connection type small punch rod test fixture fixing base, are achieved by the following specific technical means:

[0007] A hollow threaded connection type small punch test fixture fixing base includes a fixture base and a base locking head arranged coaxially;

[0008] The fixture base is a hollow cylindrical structure with an open top. Its upper inner wall is provided with internal threads for connecting the small punch test fixture, and its lower outer side is provided with a radially protruding annular fixing platform.

[0009] The columnar sidewall of the clamp base is provided with at least one observation window;

[0010] The base locking head is sleeved on the outside of the fixture base, and its inner wall is provided with locking threads for connecting with the testing machine body;

[0011] When the base locking head is tightened, its upper end face presses against the surface of the annular fixing platform to lock the clamp base.

[0012] Furthermore, the sidewall of the base locking head is provided with at least two opposing operating planes.

[0013] Furthermore, both the internal thread and the locking thread are fine-pitch threads.

[0014] Furthermore, the outer diameter of the annular fixing platform is larger than the outer diameter of the clamp base column portion.

[0015] Furthermore, the observation window is an elongated through-hole extending along the axial direction.

[0016] Furthermore, a sealing washer is provided between the internal thread of the clamp base and the external thread of the special clamp.

[0017] Furthermore, the upper surface of the annular fixing platform is provided with at least one positioning pin hole.

[0018] Furthermore, the bottom outer edge of the clamp base is provided with a chamfered structure.

[0019] Furthermore, the lower end face of the base locking head is provided with an annular groove, and an elastic sealing ring is embedded in the annular groove.

[0020] Furthermore, the clamp base is made of high-strength stainless steel, and the base locking head is made of tool steel.

[0021] Compared with the prior art, the clamp fixing base provided by this utility model has the following significant advantages:

[0022] Successfully adapted to bidirectional loading tests: This utility model creatively adopts a hollow threaded connection structure, which allows the special fixture to be suspended and fixed to the base through the thread, while the hollow inner cavity of the base provides an unobstructed through channel for the lower loading rod, thus solving the problem of the contradiction between the traditional solid support rod structure and the bidirectional loading requirements.

[0023] Stable installation and precise alignment are achieved: the fixture base is firmly locked onto the testing machine through the end-face clamping mechanism of the base locking head and the annular fixed platform, preventing loosening and shaking during the test. The fixture base serves as the installation reference, ensuring that the fixture connected to it has high initial alignment accuracy.

[0024] In addition, this utility model has the following advantages: compact structure, small size, light weight, suitable for various models of small punch testing machines; simple and quick installation and disassembly process, no special tools required, significantly improving testing efficiency; good versatility and expandability, the appropriate clamp base and locking head can be replaced according to different testing needs; high structural strength, suitable for harsh testing environments such as high temperature and high pressure, and long service life. Attached Figure Description

[0025] Figure 1 This is an overall schematic diagram of a slotted thin-walled metal sealing gas protection cover for small punch testing, provided in an embodiment of a hollow threaded connection type small punch test fixture fixing base of this utility model.

[0026] Figure 2 This is a schematic diagram showing the connection between the slotted thin-walled metal sealing gas protection cover for small punch testing and a specially made top cover in an embodiment of a hollow threaded connection type small punch test fixture fixing base of this utility model.

[0027] Figure 3 This is a three-dimensional schematic diagram of the base locking head in the fixing base of a hollow threaded connection small punch test fixture of this utility model.

[0028] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0029] 1. Fixture base; 2. Base locking head; 3. Locating pin hole; 4. Sealing gasket; 5. Elastic sealing ring; 11. Internal thread; 12. Annular fixed platform; 13. Observation window; 21. Locking thread; 22. Operating plane; 23. Annular groove. Detailed Implementation

[0030] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0031] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Example:

[0034] As attached Figure 1 To be continued Figure 3 As shown:

[0035] This utility model provides a hollow threaded connection type small punch test fixture fixing base, including a fixture base 1 and a base locking head 2 arranged coaxially;

[0036] The fixture base 1 is a hollow cylindrical structure with an open top. Its upper inner wall is provided with an internal thread 11 for connecting the small punch test fixture, and its lower outer side is provided with a radially protruding annular fixing platform 12.

[0037] At least one observation window 13 is provided on the columnar side wall of the clamp base 1;

[0038] The base locking head 2 is sleeved on the outside of the fixture base 1, and its inner wall is provided with locking threads 21 for connecting with the testing machine body;

[0039] When the base locking head 2 is tightened, its upper end face presses against the surface of the annular fixing platform 12 to lock the clamp base 1, which is the core of this structure. Its main body is a hollow cylinder with an open top, the hollow channel allowing the lower loading rod to pass through without interference. The upper inner wall of the cylinder is machined with internal threads 11 for engaging with the external threads at the lower end of a specially designed small punch test fixture, thereby suspending and fixing the fixture in a central position. On the lower outer side of the cylinder, an integrally machined, radially protruding annular fixing platform 12 is provided, with both its upper and lower end faces ensuring flatness. Furthermore, an observation window 13 is provided on the side wall of the cylinder; this window is an elongated through-hole extending axially, used to directly observe the working status of the lower loading rod or make necessary adjustments during the test. In a preferred embodiment, the total length of the clamp base 1 is approximately 150 mm, wherein the axial height of the annular fixing platform 12 is approximately 10 mm, the outer diameter is approximately 42 mm, and the outer diameter of the column portion is approximately 34 mm.

[0040] The base locking head 2 is a key component used to rigidly lock the fixture base 1 onto the testing machine. It is a hollow cylindrical sleeve that fits over the cylindrical portion of the fixture base 1. The inner wall of the base locking head 2 is machined with locking threads 21 for connection with corresponding threaded holes on the base plate of the testing machine body. To facilitate installation and disassembly, two opposing operating planes 22 are machined on its outer wall to facilitate wrench clamping and force application. The inner diameter design of the base locking head 2 must ensure that it can easily fit over the cylindrical portion of the fixture base 1.

[0041] The base locking head 2 has at least two opposing operating planes 22 on its side wall.

[0042] Both the internal thread 11 and the locking thread 21 are fine-pitch threads.

[0043] The outer diameter of the annular fixed platform 12 is larger than the outer diameter of the column part of the clamp base 1.

[0044] Among them, the observation window 13 is an elongated through hole extending along the axial direction.

[0045] Among them, a sealing washer 4 is provided between the internal thread 11 of the fixture base 1 and the external thread of the special fixture. The sealing washer 4 between the internal thread 11 of the fixture base 1 and the external thread of the special fixture is provided to prevent fluid medium from seeping into the thread gap during the test, which would affect the test accuracy and equipment life.

[0046] The upper surface of the annular fixing platform 12 is provided with at least one positioning pin hole 3. The upper surface of the annular fixing platform 12 is provided with two symmetrical positioning pin holes 3, which are used to cooperate with the positioning pins on the testing machine base plate to ensure the precise positioning of the fixture base 1 during the installation process and avoid rotational misalignment.

[0047] The bottom outer edge of the clamp base 1 is provided with a chamfered structure.

[0048] The lower end face of the base locking head 2 is provided with an annular groove 23, and an elastic sealing ring 5 is embedded in the annular groove 23. The annular groove on the lower end face of the base locking head 2, with the elastic sealing ring 5 embedded in it, enhances the sealing performance with the test machine substrate, making it suitable for high temperature, high pressure or corrosive test environments and preventing media leakage.

[0049] The clamp base 1 is made of high-strength stainless steel, and the base locking head 2 is made of tool steel.

[0050] The specific usage and function of this embodiment are as follows:

[0051] First, screw the small punch test fixture into the internal thread 11 on the upper end of the fixture base 1. Then, place the assembled fixture base 1 in the corresponding mounting position of the lower loading unit of the testing machine, ensuring that the lower loading rod can pass smoothly through the hollow channel. Next, fit the base locking head 2 onto the fixture base 1. Finally, use a wrench to tighten the base locking head 2, causing it to continuously screw into the testing machine base plate. During this process, the upper end face of the base locking head 2 will move downwards and eventually press against the lower surface of the annular fixing platform 12 of the fixture base 1. Through this strong end face clamping force, the entire fixture base 1 is firmly and vertically locked onto the testing machine, providing extremely high installation rigidity and stability for the fixtures connected to it, enabling it to withstand the reciprocating loads in bidirectional fatigue testing.

[0052] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A hollow threaded connection type small punch test fixture fixing base, characterized in that, Includes a clamp base (1) and a base locking head (2) arranged coaxially; The fixture base (1) is a hollow cylindrical structure with an open top. Its upper inner wall is provided with an internal thread (11) for connecting the small punch test fixture, and its lower outer side is provided with a radially protruding annular fixing platform (12). The column sidewall of the clamp base (1) is provided with at least one observation window (13); The base locking head (2) is sleeved on the outside of the clamp base (1), and its inner wall is provided with locking threads (21) for connecting with the test machine body. When the base locking head (2) is tightened, its upper end face presses against the surface of the annular fixing table (12) to lock the clamp base (1).

2. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, The base locking head (2) has at least two opposing operating planes (22) on its side wall.

3. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, Both the internal thread (11) and the locking thread (21) are fine-pitch threads.

4. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, The outer diameter of the annular fixed platform (12) is larger than the outer diameter of the column part of the clamp base (1).

5. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, The observation window (13) is an elongated through hole extending along the axial direction.

6. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, A sealing washer (4) is provided between the internal thread (11) of the clamp base (1) and the external thread of the special clamp.

7. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, The upper surface of the annular fixed platform (12) is provided with at least one positioning pin hole (3).

8. The hollow threaded connection type small punch test fixture fixing base according to claim 1, characterized in that, The bottom outer edge of the clamp base (1) is provided with a chamfered structure.

9. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, The lower end face of the base locking head (2) is provided with an annular groove (23), and an elastic sealing ring (5) is embedded in the annular groove (23).

10. A hollow threaded connection type small punch test clamp fixing base according to claim 1, characterized in that, The clamp base (1) is made of high-strength stainless steel, and the base locking head (2) is made of tool steel.

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