Standard test piece vibration fatigue test clamp and installation method

Abstract

The invention belongs to the technical field of vibration tests, and particularly relates to a standard test piece vibration fatigue test clamp and an installation method, the standard test piece vibration fatigue test clamp comprises a clamp body and a clamping plate, and the clamping plate is inserted into the clamp body; the clamping plate comprises a transverse clamping plate, a longitudinal clamping plate, a columnar clamping plate and a mounting groove; the longitudinal clamping plate is vertically connected to one long side of the transverse clamping plate to form a T shape, the upper and lower plate surfaces of the transverse clamping plate protrude to form columnar clamping plates, and the mounting groove is located in the upper plate surface of the transverse clamping plate and extends to the opposite side from the side where the longitudinal clamping plate is located; preformed holes are formed in the longitudinal clamping plates; the clamp body is provided with a T-shaped groove, the shape of the T-shaped groove is the same as the projection of the clamping plate in the inserting direction of the clamping plate, and the clamp body is provided with a mounting hole communicated and matched with the preformed hole. When the clamping plate is inserted into the clamp body along the T-shaped groove, the mounting hole in the clamp body is connected with the preformed hole in the clamping plate through a bolt.

Description

Technical Field

[0001] The present application belongs to the field of vibration test technology, and in particular relates to a vibration fatigue test fixture for a standard test piece and an installation method. Background Art

[0002] Standard test pieces (referred to as standard pieces) are usually used to determine the mechanical properties of materials. In the field of dynamics, the vibration fatigue life, fatigue limit and fatigue crack propagation of materials can all be measured through vibration fatigue tests of standard pieces.

[0003] The vibration fatigue test of standard parts is mainly carried out by installing the standard parts on the vibration table using a fixture. The test results are affected by factors such as stress concentration, average stress, notch effect and surface state. Therefore, the installation effect formed by the design of the fixture greatly affects the results of the vibration fatigue test. At present, there are two types of standard parts vibration fatigue test fixtures. One is two pressure plates with bolt holes. The standard parts are pressed between the two plates by bolt connection to ensure the fixed support boundary conditions and the vibration transmission rate. However, in the vibration fatigue test, the pressure plate is squeezed by the bolts, causing the fixed support section of the standard part to be stressed, which can easily cause stress concentration at the end of the standard part, changing its stress state and the alternating stress during the test, thereby affecting the vibration fatigue test results; the second method is to process a certain number of through holes on the standard part and connect it to the fixing fixture through bolts. This method cannot quantify the force at the bolt connection. If the bolt tightening force is too small, the bolt is easy to loosen and the vibration transmission rate cannot be guaranteed. If the bolt tightening force is too large, it will cause stress concentration in the through hole accessories.

[0004] In addition, the current vibration fatigue test fixture has a fixed size and its purpose is to match with existing standard parts, which leads to its poor versatility, poor matching and low precision for test pieces of varying sizes, and difficulty in repeated application. Therefore, it is necessary to explore a new and effective vibration fatigue test fixture and its installation method. Summary of the invention

[0005] In order to solve the above problems, the present application provides a standard test piece vibration fatigue test fixture, comprising:

[0006] A clamp body and a card plate, wherein the card plate is inserted into the clamp body;

[0007] The cardboard includes: a horizontal cardboard, a longitudinal cardboard, a columnar cardboard and a mounting groove;

[0008] The longitudinal card plate is vertically connected to a long side of the transverse card plate to form a T-shape, the upper and lower board surfaces of the transverse card plate are raised to form a columnar card plate, and the mounting groove is located on the upper board surface of the transverse card plate, which extends from the side where the longitudinal card plate is located to the opposite side; the longitudinal card plate has a reserved hole;

[0009] The clamp body has a T-shaped slot, the shape of the T-shaped slot is the same as the projection of the card board along the card board insertion direction, and the clamp body has a mounting hole connected and matched with the reserved hole;

[0010] When the clamping plate is inserted into the clamping body along the T-slot, the mounting holes on the clamping body are connected with the reserved holes on the clamping plate by bolts.

[0011] Preferably, one side of the card plate has a mounting ring.

[0012] Preferably, the clamp body comprises a bottom plate and an upper plate, the T-slot is located on the upper plate, the bottom plate has a larger area than the upper plate, the upper plate is mounted on the bottom plate, and the bottom plate has a round through hole for fixed installation.

[0013] Preferably, the shape of the mounting groove is adapted to the standard component to be tested.

[0014] Preferably, the T-slot includes a longitudinal slot adapted to the longitudinal clamping plate, and a transverse slot adapted to the transverse clamping plate, wherein the transverse slot passes through the side surface of the clamp body so that the standard part to be tested is partially exposed.

[0015] Preferably, a card is further included to fill the gap between the standard part to be tested and the installation groove.

[0016] Preferably, the T-slot is through or half-through along the card insertion direction.

[0017] A method for installing a standard test piece vibration fatigue test fixture, using the standard test piece vibration fatigue test fixture, comprises the following steps:

[0018] Install one end of the standard part into the mounting groove of the card plate;

[0019] When the height of the standard part is less than the height of the installation slot, install the card;

[0020] Insert the card plate with standard parts into the T-slot of the clamp body through the mounting ring, and connect the mounting holes on the clamp body with the reserved holes on the card plate through bolts;

[0021] Connect the clamp body to the vibration table through the bottom through hole to complete the installation of the standard parts;

[0022] Determine the measurement points and control points of the vibration fatigue test, connect the vibration control and data acquisition equipment, start the vibration table, and conduct the vibration fatigue test of the standard parts.

[0023] The advantages of the present application include: by setting a mounting groove on the clamping plate, the clamping end of the test piece is closely matched with the inner surface of the mounting groove of the clamping plate, and a T-shaped groove is designed inside the clamping body, so that the clamping plate and the clamping body are closely matched, thereby achieving fixation of the clamping body, effectively avoiding local stress concentration of the test piece due to external clamping, avoiding fatigue damage and fatigue cracks at the clamping end, ensuring the reliability and stability of the vibration fatigue test process, and the effectiveness and accuracy of the test results.

[0024] In addition, mounting holes are designed on the clamp body and reserved holes are designed on the clamp plate, which are connected by bolts to limit the freedom of the clamp plate in the T-slot in the direction perpendicular to the transverse slot, which will not cause adverse effects such as stress concentration on the test piece. At the same time, vibration transmission is guaranteed, and the stability of the fixture is very good.

[0025] At the same time, a columnar clamp is set on the clamp, which is in close contact with the concave arc groove of the clamp body, limiting the freedom of the clamp and the transverse groove in the same direction. Compared with the traditional pressure plate bolt connection and hole bolt connection, it will not bring stress concentration and prestress to the standard parts, ensuring the effectiveness of the fatigue test, while ensuring the rigid connection and transmission rate, and the stability of the fixture is further improved.

[0026] Furthermore, a card is designed between the clamping end of the standard part and the transverse groove. When the depth of the installation groove is much greater than the thickness of the standard part, the gap can be filled to ensure close contact between the standard part and the clamp body. At the same time, for the vibration fatigue test, in order to obtain the SN curve, it is necessary to repeat the vibration fatigue test many times. It cannot be guaranteed that every standard part is in complete and close contact with the card slot. The card can be used to fill the gap between standard parts of different thicknesses, which expands the use scope of the vibration fatigue test fixture and has strong versatility.

[0027] At the same time, the present invention also provides a method for installing a vibration fatigue test fixture for a standard test piece. The test fixture is simple, the components are easy to disassemble and assemble, the vibration transmission characteristics are good, the efficiency of the vibration fatigue test is improved, and the authenticity and effectiveness of the vibration fatigue test results are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the vibration test fixture;

[0029] Figure 2 It is a three-dimensional picture with a specific clip;

[0030] Figure 3 It is an isometric view of the clamp concrete;

[0031] Figure 4 It is a top view of the concrete clamp;

[0032] Figure 5 It is the AA section view of the concrete;

[0033] Figure 6 It is a three-dimensional picture of the pallet;

[0034] Figure 7 is an isometric view of the pallet;

[0035] Figure 8 It is a three-dimensional picture of the card;

[0036] Fig. 9 It is the assembly diagram of the pallet and standard parts;

[0037] Fig.10 It is the assembly diagram of the card board, standard parts and cards;

[0038] Fig.11 It is a schematic diagram of the assembly of pallets, standard parts, cards and clamps. DETAILED DESCRIPTION

[0039] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0040] like Figure 1-Figure 11 As shown, the present invention provides a standard part vibration fatigue test fixture, including a clamp body 1, a card, a card and a standard part. The standard part is installed in the card, and the card is installed in the clamp body 1; the card is provided with a mounting groove 26, and the clamping end of the standard part contacts and fits tightly with the groove surface; the clamp body 1 has a T-slot 13, and the outer surface of the card contacts and fits tightly with the inner surface of the T-slot 13. At the same time, the clamp body 1 and the card limit the freedom of the card along the direction of the T-slot 13 through 6 bolt holes, thereby limiting the freedom of the standard along its width direction.

[0041] The clamp body 1 is composed of a bottom plate 12 and an upper plate 14, which are integrally formed during processing. On the bottom plate 12, there are 4 round through holes, the centers of which are symmetrically distributed on the entire bottom plate 12. Bolts pass through these through holes and are connected to the threaded holes on the vibration table top; the upper plate 14 is located at the center of the bottom plate 12, and is provided with a T-shaped slot 13, including a vertical slot and a transverse slot, which can be through or semi-through. The figure shows a through scheme, in which the transverse slot is perpendicular to the longitudinal slot, and an inwardly concave arc slot is designed at a certain distance from the end of the transverse slot. On one side of the clamp body 1 in the same direction as the vertical slot, there are two rows of 6 mounting holes 11 evenly distributed in three columns with equal spacing, with wire screw sleeves embedded therein, which penetrate into the space where the vertical slot is located, and extend to a certain depth on the other side of the vertical slot of the clamp body 1.

[0042] The card plate 2 is composed of a horizontal card plate 24, a vertical card plate 21, a columnar card plate 25, a mounting groove 26 and a mounting ring 23. The horizontal card plate 24 and the vertical card plate 21 are perpendicular to each other. On the vertical card plate 21, there are two rows and three columns of 6 circular reserved holes 22 evenly distributed, which penetrate the vertical card plate and are embedded with wire screw sleeves. These 6 holes are the same size as the 6 holes on the side of the clamp body 1, and the distance between each hole is the same; the mounting groove 26 is located at the center of the horizontal card plate 24, penetrates the horizontal card plate 24 by a certain distance, and has a certain height reserved from the bottom of the horizontal card plate 24. At the same time, the mounting groove 26 also penetrates the upper part of the columnar card plate 25; the mounting ring 23 is located on either side of the horizontal card plate 24, in a mouth shape, with the other side of the mounting ring 23 as the observation angle, and the card plate and the T-shaped groove 13 of the clamp body 1 have the same edge line.

[0043] When the card plate 2 is installed on the clamp body 1, the horizontal card plate 24 is installed in the horizontal groove, the vertical card plate is installed in the vertical groove, and the columnar card plate 25 is installed in the concave arc groove, and all three are tightly fitted in surface contact; the function of the mounting ring 23 is to facilitate the card plate to be sent in and out of the T-shaped groove 13.

[0044] When viewed from above, the mounting grooves 26 on the card and the card plate have the same edge lines, and the card has a certain thickness. The card is installed in the gap between the standard part and the clamp body 1. If the thickness of the standard part is equal to the depth of the mounting groove 26, the card is not required; if the thickness of the standard part is less than the depth of the mounting groove 26, the card is required to fill it to ensure that the test piece and the card in the mounting groove 26 are still tightly fitted to the clamp body 1.

[0045] The present invention also provides a method for installing a standard test piece vibration fatigue test fixture, comprising the following steps:

[0046] First, install one end of the standard part in the mounting groove 26 of the card plate. Choose whether to install the card as needed. Then push the card plate with the standard part into the T-shaped groove 13 of the clamp body 1 through the mounting ring 23, and connect the mounting hole 11 on the clamp body 1 with the reserved hole 22 on the card plate 2 through bolts. Finally, connect the clamp body 1 to the vibration table surface; determine the measuring points and control points of the vibration fatigue test, and connect the vibration control and data acquisition equipment; start the vibration table to conduct the vibration fatigue test of the standard part.

[0047] Beneficial effects:

[0048] The standard part vibration fatigue test fixture described in the present invention provides a mounting groove 26 on the clamping plate so that the clamping end of the test piece is tightly matched with the inner surface of the clamping plate mounting groove 26, and a T-shaped groove 13 is designed inside the clamp body 1 so that the clamping plate and the clamp body 1 are tightly matched, thereby achieving the fixation of the clamp body 1, effectively avoiding local stress concentration of the test piece due to external clamping, avoiding fatigue damage and fatigue cracks at the clamping end, and ensuring the reliability and stability of the vibration fatigue test process and the effectiveness and accuracy of the test results.

[0049] In addition, a mounting hole 11 is designed on the clamp body 1, and a reserved hole 22 is designed on the clamp plate. Through bolt connection, the freedom of the clamp plate in the T-slot 13 in a direction perpendicular to the transverse slot is limited, which will not cause adverse effects such as stress concentration on the test piece. At the same time, vibration transmission is guaranteed, and the stability of the fixture is very good.

[0050] At the same time, a columnar clamping plate 25 is arranged on the clamping plate, which is in close contact with the concave arc groove of the clamp body 1, limiting the freedom of the clamping plate and the transverse groove in the same direction. Compared with the traditional pressure plate bolt connection and hole bolt connection, it will not bring stress concentration and prestress to the standard parts, thereby ensuring the effectiveness of the fatigue test, while ensuring the rigid connection and transmission rate, and further improving the stability of the fixture.

[0051] Furthermore, a card is designed between the clamping end of the standard part and the transverse groove. When the depth of the installation groove 26 is much greater than the thickness of the standard part, the gap can be filled to ensure close contact between the surface of the standard part and the clamp body 1. At the same time, for the vibration fatigue test, in order to obtain the SN curve, it is necessary to repeat the vibration fatigue test many times. It cannot be guaranteed that every standard part is in complete and close contact with the card slot, and the card can be used to fill the gap between standard parts of different thicknesses, thereby expanding the scope of use of the vibration fatigue test fixture and having strong versatility.

[0052] At the same time, the present invention also provides a method for installing a vibration fatigue test fixture for a standard test piece. The test fixture is simple, the components are easy to disassemble and assemble, the vibration transmission characteristics are good, the efficiency of the vibration fatigue test is improved, and the authenticity and effectiveness of the vibration fatigue test results are ensured.

[0053] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A standard test piece vibration fatigue test fixture, characterized in that: include: A clamp body (1) and a clamping plate (2), wherein the clamping plate (2) is inserted into the clamp body (1); The card plate (2) comprises: a transverse card plate (24), a longitudinal card plate (21), a columnar card plate (25) and a mounting groove (26); The longitudinal card plate (21) is vertically connected to a long side of the transverse card plate (24) to form a T-shape, the upper and lower plate surfaces of the transverse card plate (24) are raised to form a columnar card plate (25), and the mounting groove (26) is located on the upper plate surface of the transverse card plate (24), extending from the side where the longitudinal card plate (21) is located to the opposite side; the longitudinal card plate (21) has a reserved hole (22); The clamp body (1) has a T-shaped groove, the shape of the T-shaped groove is the same as the projection of the clamping plate (2) along the insertion direction of the clamping plate (2), and the clamp body (1) has a mounting hole (11) that is connected and matched with the reserved hole (22); When the clamping plate (2) is inserted into the clamping body (1) along the T-slot, the mounting hole (11) on the clamping body (1) is connected with the reserved hole (22) on the clamping plate (2) by means of bolts.

2. The standard test piece vibration fatigue test fixture as claimed in claim 1, characterized in that: One side of the clamping plate (2) is provided with a mounting ring (23).

3. The standard test piece vibration fatigue test fixture as claimed in claim 1, characterized in that: The clamp body (1) comprises a bottom plate (12) and an upper plate (14), the T-shaped slot is located on the upper plate (14), the bottom plate (12) has a larger area than the upper plate (14), the upper plate (14) is mounted on the bottom plate (12), and the bottom plate (12) has a round through hole for fixed installation.

4. The standard test piece vibration fatigue test fixture as claimed in claim 1, characterized in that: The shape of the mounting groove (26) is adapted to the standard part to be tested.

5. The standard test piece vibration fatigue test fixture as claimed in claim 1, characterized in that: The T-shaped slot comprises a longitudinal slot adapted to the longitudinal clamping plate (21) and a transverse slot adapted to the transverse clamping plate (24), wherein the transverse slot passes through the side surface of the clamp body (1) so that a portion of the standard part to be tested is exposed.

6. The standard test piece vibration fatigue test fixture as claimed in claim 1, characterized in that: It also includes a card (3) for filling the gap between the standard part to be tested and the installation groove (26).

7. The standard test piece vibration fatigue test fixture as claimed in claim 1, characterized in that: The T-shaped groove is through or half-through along the insertion direction of the clamping plate (2).

8. A method for installing a standard test piece vibration fatigue test fixture, using the standard test piece vibration fatigue test fixture as described in any one of claims 1 to 7, comprising the following steps: Mount one end of the standard part in the mounting groove (26) of the card plate (2); When the height of the standard part is less than the height of the installation slot (26), the card (3) is installed; Insert the clamping plate (2) equipped with standard parts into the T-shaped groove (13) of the clamping body (1) through the mounting ring (23), and connect the mounting hole (11) on the clamping body (1) with the reserved hole (22) on the clamping plate 2 by bolts; Connect the clamp body (1) to the vibration table through the bottom through hole, thus completing the installation of the standard parts; Determine the measurement points and control points of the vibration fatigue test, connect the vibration control and data acquisition equipment, start the vibration table, and conduct the vibration fatigue test of the standard parts.

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