Self-locking mechanism and high-temperature fatigue test sample

Abstract

The utility model relates to the technical field of gas turbines, in particular to a self-locking mechanism and a high-temperature fatigue test sample, which comprise a connecting component, a connecting sleeve, a connecting cavity arranged at the bottom end of the connecting sleeve, and a threaded head fixedly connected at the top end of the connecting sleeve, an operation assembly is adaptively mounted in the connecting sleeve, a positioning assembly is adaptively mounted in the connecting sleeve, a limiting assembly is arranged in the connecting sleeve, and a connecting cavity is formed in an inverted trapezoidal shape; when a sample to be tested needs to be installed, only one end of the sample to be tested needs to be inserted into the connecting cavity, the sample to be tested can be installed and fixed by the threaded rod through the operation steps of pressing and rotating, meanwhile, the mistaken touch prevention design can ensure that the threaded rod cannot be mistakenly touched and loosened after being installed and fixed, and the accuracy of experimental data is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbines, in particular to a self-locking mechanism and a high-temperature fatigue test sample. Background Art

[0002] Under load and high temperature environment, frequent start-stop operation will cause turbine blades to be prone to various mechanical fracture failures, among which fatigue failure is the main failure form. Therefore, fatigue performance analysis of turbine blades is an important means to ensure the safe operation of gas turbines.

[0003] In order to accurately evaluate the fatigue performance of turbine blades in different overhaul cycles, researchers usually use bulk sampling methods to conduct related research. Due to the complex hollow structure and small geometric shape of turbine blades, it is a common practice to prepare small-sized plate-shaped non-standard fatigue specimens and their corresponding fixtures.

[0004] At present, the fixtures for small-sized plate-shaped non-standard fatigue specimens are mainly divided into two types: pin-fastened type and hanging plate type. The pin-fastened fixture requires drilling a hole in the center of the clamping section to install the pin, which will cause greater stress concentration during the test, especially for specimens with smaller thickness, which can easily cause the pin hole to be torn. The traditional hanging plate type fixture has certain limitations due to insufficient positioning accuracy and clamping force, as well as high requirements for the size of the fixture raw materials. Although the two types of clamping and fixing can achieve installation and positioning, they are prone to accidental touch during the experiment and after installation and fixing, causing the fixture to loosen and fail to effectively fix the test sample, affecting the accuracy of the experimental data.

[0005] Moreover, the current test samples need to be completely connected with the fixture, and they themselves cannot be preliminarily installed with the fixture, resulting in inconvenience in the actual installation process. Utility Model Content

[0006] In view of the problem that the above or prior art technologies are prone to accidental touches, which may cause the clamp to loosen, the present utility model is proposed.

[0007] Therefore, the purpose of the utility model is to provide a self-locking mechanism.

[0008] In order to solve the above technical problems, the utility model provides the following technical solutions: a self-locking mechanism, comprising:

[0009] The connecting component comprises a connecting sleeve, a connecting cavity provided at the bottom end of the connecting sleeve, and a threaded head fixedly connected to the top end of the connecting sleeve, wherein an anti-slip cavity is provided on the outside of the connecting sleeve;

[0010] Among them, the operating component is adapted and installed inside the connecting sleeve, the positioning component is adapted and installed inside the connecting sleeve, a limiting component is arranged inside the connecting sleeve, and the opening shape of the connecting cavity is an inverted trapezoid.

[0011] As a preferred solution of the self-locking mechanism of the utility model, the operating component includes a rotating block rotatably connected to the inside of the threaded head, an annular cavity opened at the top center of the rotating block, and a slot opened at the bottom end of the annular cavity, a turntable is rotatably connected to the inner bottom end of the slot, a control part is adapted to be installed at the top of the turntable, and a transmission part is arranged at the bottom end of the rotating block.

[0012] As a preferred solution of the self-locking mechanism of the utility model, wherein: the control member includes a first spring fixedly connected to the top of the turntable, a clamping block fixedly connected to the top of the first spring, and a hexagonal adapter head fixedly connected to the top of the clamping block;

[0013] Wherein, the card slot and the card block are adapted and connected to each other.

[0014] As a preferred solution of the self-locking mechanism of the utility model, wherein: the transmission member includes a transmission rod fixedly connected to the bottom end of the rotating block, and a convex strip fixedly connected to the outer side of the transmission rod.

[0015] As a preferred solution of the self-locking mechanism of the utility model, wherein: the internal thread of the connecting sleeve is connected with a threaded rod, a mounting cavity provided on the outside of the threaded rod, and a groove provided inside the threaded rod;

[0016] Wherein, the transmission rod is slidably connected to the threaded rod, and the convex strip is located inside the groove.

[0017] As a preferred solution of the self-locking mechanism of the utility model, wherein: the limit assembly includes a mounting ring sleeved inside the mounting cavity, a connecting rod fixedly connected to the outside of the mounting ring, and a connecting plate fixedly connected to both ends of the connecting rod, and the bottom end of the connecting plate is adapted to be installed with a fastener;

[0018] Wherein, the connecting rod and the connecting plate are slidably connected inside the connecting sleeve.

[0019] As a preferred solution of the self-locking mechanism of the utility model, the fastener includes a second spring fixedly connected to the bottom end of the connecting plate, and a limit block fixedly connected to the bottom end of the second spring, and the bottom end of the limit block is opened at an oblique angle on one side away from the mounting ring.

[0020] As a preferred solution of the self-locking mechanism of the utility model, it also includes:

[0021] The auxiliary component includes a locking block clamped in the connecting cavity, a limiting groove arranged at the top of the locking block, and first inclined surfaces arranged at both sides of the locking block. The locking block is shaped into an inverted trapezoid through the opening of the first inclined surfaces.

[0022] The beneficial effect of the self-locking mechanism of the utility model is as follows: when the test sample needs to be installed, it is only necessary to insert one end of the test sample into the connecting cavity first, and through the operation steps of "one press and one turn", the threaded rod can be installed and fixed to the test sample. At the same time, the anti-accidental touch design can ensure that the threaded rod cannot be accidentally loosened after installation and fixation, thereby ensuring the accuracy of the experimental data.

[0023] In view of the fact that in actual use, there is still a problem that the clamp cannot be initially installed.

[0024] Therefore, another object of the present invention is to provide a high temperature fatigue test specimen.

[0025] In order to solve the above technical problems, the utility model also provides the following technical solutions: a high temperature fatigue test sample, including the self-locking mechanism, and

[0026] The testing mechanism comprises a testing sample and positioning holes provided at two ends of the testing sample, wherein the positioning holes are adapted to be clamped with the threaded rod.

[0027] As a preferred solution of the high temperature fatigue test sample of the utility model, the two ends of the test sample are designed in a semi-disc shape, and second inclined surfaces are opened on both sides of the two ends of the test sample. The opening of the second inclined surfaces makes the shapes of the two ends of the test sample inverted trapezoidal.

[0028] The high temperature fatigue test sample of the utility model has the beneficial effect that the stability of the test sample and the connecting sleeve after initial installation can be achieved through the ingenious structural design of the two ends of the test sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0030] Figure 1 It is an overall schematic diagram of the utility model.

[0031] Figure 2 It is an explosion diagram of the utility model.

[0032] Figure 3 It is a side schematic diagram of the test sample of the present utility model.

[0033] Figure 4 It is a schematic diagram of the connecting components of the present utility model.

[0034] Figure 5 It is a cross-sectional schematic diagram of the utility model.

[0035] Figure 6 This is a second schematic cross-sectional view of the present invention.

[0036] Figure 7 It is an overall schematic diagram of the positioning component of the utility model.

[0037] Figure 8 It is an overall schematic diagram of the limit assembly of the utility model.

[0038] Fig. 9 It is an overall schematic diagram of the auxiliary components of the utility model. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0042] Example 1

[0043] Reference Figure 1 to Figure 7 , is the first embodiment of the utility model, which provides a self-locking mechanism, including:

[0044] The connecting component 100 includes a connecting sleeve 101, a connecting cavity 102 opened at the bottom end of the connecting sleeve 101, and a threaded head 103 fixedly connected to the top end of the connecting sleeve 101. An anti-slip cavity 104 is arranged outside the connecting sleeve 101.

[0045] The connection sleeve 101 has an operating assembly 105 installed therein, a positioning assembly 106 installed therein, a limiting assembly 107 arranged therein, and the connection cavity 102 has an inverted trapezoidal shape.

[0046] Specifically, the operating component 105 includes a rotating block 105a rotatably connected to the inside of the threaded head 103, an annular cavity 105b opened at the top center of the rotating block 105a, and a slot 105c opened at the bottom end of the annular cavity 105b. The bottom end of the inner bottom of the slot 105c is rotatably connected to a turntable 105d, the top of the turntable 105d is adapted to be installed with a control member 105e, and the bottom end of the rotating block 105a is provided with a transmission member 105f.

[0047] Furthermore, the control member 105e includes a first spring 105e-1 fixedly connected to the top of the rotating disk 105d, a clamping block 105e-2 fixedly connected to the top of the first spring 105e-1, and a hexagon socket adapter 105e-3 fixedly connected to the top of the clamping block 105e-2;

[0048] The card slot 105c and the card block 105e-2 are adapted to be connected with each other.

[0049] Preferably, the transmission member 105f includes a transmission rod 105f-1 fixedly connected to the bottom end of the rotating block 105a, and a convex strip 105f-2 fixedly connected to the outer side of the transmission rod 105f-1.

[0050] It should be noted that the internal thread of the connecting sleeve 101 is connected with a threaded rod 106a, a mounting cavity 106b provided outside the threaded rod 106a, and a groove 106c provided inside the threaded rod 106a;

[0051] The transmission rod 105f-1 is slidably connected to the threaded rod 106a, and the convex strip 105f-2 is located inside the groove 106c.

[0052] When the test sample 301 needs to be installed and fixed, first insert one end of the test sample 301 into the connecting cavity 102, then insert the hexagonal adapter 105e-3 into the hexagonal adapter head 105e-3 and press it, so that the block 105e-2 at the bottom end of the hexagonal adapter head 105e-3 squeezes the first spring 105e-1 and inserts it into the slot 105c, then rotate the hexagonal adapter head 105e-3 with the hexagonal wrench, and the rotating block 105a is driven to rotate with the cooperation of the block 105e-2 and the slot 105c, and the rotating block 105a will drive the transmission rod 105f-1 and the convex strip 105f-2 to rotate synchronously through the rotating block 105a, and at this time, the threaded rod 106a will be driven to rotate and gradually slide downward until the bottom end of the threaded rod 106a is completely inserted into the positioning hole 302, then stop rotating and remove the hexagonal wrench to complete the installation of one end of the test sample 301.

[0053] After taking out the hexagonal wrench, under the elasticity of the first spring 105e-1, the block 105e-2 will be driven to leave the inside of the slot 105c and reset. At this time, if the hexagonal adapter 105e-3 is rotated, it will only cause the block 105e-2 to rotate inside the annular cavity 105b, and synchronously drive the turntable 105d to rotate, but will not cause the rotating block 105a to rotate, ensuring that the threaded rod 106a cannot be accidentally loosened after being installed and fixed, thereby ensuring the accuracy of the experimental data.

[0054] In summary, when the test sample 301 needs to be installed, it is only necessary to insert one end of the test sample 301 into the connecting cavity 102 first, and through the "one press and one turn" operation steps, the threaded rod 106a can be installed and fixed to the test sample 301. At the same time, the anti-accidental touch design can ensure that the threaded rod 106a cannot be accidentally loosened after installation and fixation, thereby ensuring the accuracy of the experimental data.

[0055] Example 2

[0056] Reference Figure 7 to Figure 9 , which is the second embodiment of the utility model. Different from the previous embodiment, this embodiment provides a limit assembly 107, including a mounting ring 107a sleeved inside the mounting cavity 106b, a connecting rod 107b fixedly connected to the outside of the mounting ring 107a, and a connecting plate 107c fixedly connected to both ends of the connecting rod 107b, and a fastener 107d is adapted to be installed at the bottom end of the connecting plate 107c;

[0057] The connecting rod 107b and the connecting plate 107c are slidably connected inside the connecting sleeve 101 .

[0058] Specifically, the fastener 107d includes a second spring 107d-1 fixedly connected to the bottom end of the connecting plate 107c, and a limit block 107d-2 fixedly connected to the bottom end of the second spring 107d-1, and the bottom end of the limit block 107d-2 is opened at an oblique angle on one side away from the mounting ring 107a.

[0059] Furthermore, it also includes:

[0060] The auxiliary component 200 includes a locking block 201 that is clamped in the connecting cavity 102, a limiting groove 202 formed at the top of the locking block 201, and first inclined surfaces 203 formed on both sides of the locking block 201. The first inclined surfaces 203 are formed to give the locking block 201 an inverted trapezoidal shape.

[0061] When the bottom end of the threaded rod 106a is fully inserted into the positioning hole 302, the mounting ring 107a is simultaneously driven to slide down to a certain distance, so that the mounting ring 107a drives the connecting plate 107c to slide through the connecting rod 107b, and the limiting block 107d-2 slides out from the inside of the connecting sleeve 101;

[0062] At this time, the arc-shaped side of the locking block 201 is inserted into the interior of the connecting cavity 102. The inverted trapezoidal design of the locking block 201 and the connecting cavity 102 can ensure the tightness of the connection between the two. During the insertion of the locking block 201, the locking block 201 will be driven to squeeze the bevel of the limit block 107d-2, so that the limit block 107d-2 slides up and squeezes the second spring 107d-1, and finally, under the elasticity of the second spring 107d-1, the limit block 107d-2 is driven to be inserted into the interior of the limit groove 202. At this time, the locking block 201 cannot be removed, ensuring that the locking block 201 effectively limits and fixes the test sample 301.

[0063] After the connecting sleeve 101 and the locking block 201 are sequentially installed by the above method, the thread heads 103 of the two sets of connecting sleeves 101 are connected to the threaded installation ends of the material tensile test, and finally the experiment is carried out.

[0064] When disassembly is required, first separate the threaded head 103 of the connecting sleeve 101 from the threaded mounting end of the material tensile test, then use an Allen wrench to press and reverse the Allen adapter head 105e-3, which will drive the threaded rod 106a to gradually separate from the positioning hole 302, and also drive the limit block 107d-2 to gradually leave the limit groove 202, and finally take the locking block 201 and the test sample 301 out of the connecting cavity 102.

[0065] In summary, after the threaded rod 106a preliminarily fixes the test sample 301, it is only necessary to insert the locking blocks 201 into both sides of the connecting cavity 102 to complete the complete fixation of the test sample 301, ensuring that the test sample 301 is firmly installed while preventing accidental touch, thereby ensuring the accuracy of the experimental data; and the overall installation and disassembly operation process is relatively simple, which is convenient for personnel to operate.

[0066] Example 3

[0067] Reference Figure 2 and Figure 3 , which is the third embodiment of the utility model. Different from the previous embodiment, this embodiment provides a high temperature fatigue test sample, including a self-locking mechanism, and,

[0068] The testing mechanism 300 includes a test sample 301 and positioning holes 302 provided at two ends of the test sample 301. The positioning holes 302 are adapted to be engaged with the threaded rod 106a.

[0069] Specifically, the two ends of the test sample 301 are designed in a semi-disc shape, and second inclined surfaces 303 are provided on both sides of the two ends of the test sample 301. The second inclined surfaces 303 are provided so that the two ends of the test sample 301 are shaped like an inverted trapezoid.

[0070] When the test sample 301 and the connecting sleeve 101 are initially installed, it is only necessary to insert one end of the test sample 301 into the interior of the connecting cavity 102. With the inverted trapezoidal design of the connecting cavity 102 and both ends of the test sample 301, the initial installation is achieved while ensuring stability after installation, which facilitates subsequent operations.

[0071] In summary, through the ingenious structural design of the two ends of the test sample 301, the stability of the test sample 301 and the connecting sleeve 101 after initial installation can be achieved.

[0072] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0073] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0074] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A self-locking mechanism, characterized in that: include, A connecting component (100) comprises a connecting sleeve (101), a connecting cavity (102) opened at the bottom end of the connecting sleeve (101), and a threaded head (103) fixedly connected to the top end of the connecting sleeve (101), wherein an anti-slip cavity (104) is arranged on the outside of the connecting sleeve (101); The connection sleeve (101) is internally adapted and installed with an operating component (105), the connection sleeve (101) is internally adapted and installed with a positioning component (106), the connection sleeve (101) is internally provided with a limiting component (107), and the opening shape of the connection cavity (102) is an inverted trapezoid.

2. The self-locking mechanism according to claim 1, characterized in that: The operating assembly (105) comprises a rotating block (105a) rotatably connected to the inside of the threaded head (103), an annular cavity (105b) opened at the top center of the rotating block (105a), and a slot (105c) opened at the bottom end of the annular cavity (105b), a rotating disk (105d) rotatably connected to the bottom end of the slot (105c), a control member (105e) is adapted to be installed at the top of the rotating disk (105d), and a transmission member (105f) is provided at the bottom end of the rotating block (105a).

3. The self-locking mechanism according to claim 2, characterized in that: The control member (105e) comprises a first spring (105e-1) fixedly connected to the top of the rotating disk (105d), a clamping block (105e-2) fixedly connected to the top of the first spring (105e-1), and a hexagon socket adapter (105e-3) fixedly connected to the top of the clamping block (105e-2); The card slot (105c) and the card block (105e-2) are adapted to be connected to each other.

4. The self-locking mechanism according to claim 2 or 3, characterized in that: The transmission member (105f) comprises a transmission rod (105f-1) fixedly connected to the bottom end of the rotating block (105a), and a convex strip (105f-2) fixedly connected to the outer side of the transmission rod (105f-1).

5. The self-locking mechanism according to claim 4, characterized in that: The connecting sleeve (101) is internally threadedly connected with a threaded rod (106a), a mounting cavity (106b) provided on the outside of the threaded rod (106a), and a groove (106c) provided inside the threaded rod (106a); Wherein, the transmission rod (105f-1) is slidably connected to the threaded rod (106a), and the convex strip (105f-2) is located inside the groove (106c).

6. The self-locking mechanism according to claim 5, characterized in that: The limiting assembly (107) comprises a mounting ring (107a) sleeved inside the mounting cavity (106b), a connecting rod (107b) fixedly connected to the outside of the mounting ring (107a), and a connecting plate (107c) fixedly connected to both ends of the connecting rod (107b), wherein a fastener (107d) is adapted to be installed at the bottom end of the connecting plate (107c); Wherein, the connecting rod (107b) and the connecting plate (107c) are slidably connected inside the connecting sleeve (101).

7. The self-locking mechanism according to claim 6, characterized in that: The fastener (107d) comprises a second spring (107d-1) fixedly connected to the bottom end of the connecting plate (107c), and a limit block (107d-2) fixedly connected to the bottom end of the second spring (107d-1), wherein the bottom end of the limit block (107d-2) is formed at an oblique angle on a side away from the mounting ring (107a).

8. The self-locking mechanism according to claim 7, characterized in that: Also includes, The auxiliary component (200) comprises a locking block (201) clamped inside the connecting cavity (102), a limiting groove (202) provided at the top of the locking block (201), and first inclined surfaces (203) provided on both sides of the locking block (201); the locking block (201) is shaped into an inverted trapezoid by the provision of the first inclined surfaces (203).

9. A high temperature fatigue test specimen, characterized in that: The invention comprises the self-locking mechanism according to any one of claims 5 to 8, and The testing mechanism (300) comprises a test sample (301) and positioning holes (302) provided at two ends of the test sample (301), wherein the positioning holes (302) are adapted to be snap-fitted with the threaded rod (106a).

10. The high temperature fatigue test specimen according to claim 9, characterized in that: The two ends of the test sample (301) are designed in a semi-disc shape, and second inclined surfaces (303) are provided on both sides of the two ends of the test sample (301). The second inclined surfaces (303) are provided so that the shapes of the two ends of the test sample (301) are inverted trapezoids.

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