Test tool clamp

Abstract

The utility model relates to the field of airplane bracing wire stretching and fatigue tests, in particular to a test tool clamp. Comprising two cushion blocks which are oppositely arranged, long grooves are formed in the opposite sides of the two cushion blocks in the length direction, and rough knurls are arranged on the surfaces of the long grooves; spherical grooves are respectively formed in the same ends of the long grooves of the two cushion blocks; the two cushion blocks are further provided with bolt connecting holes and positioning holes. The two cushion blocks are connected and fixed through bolts penetrating through the bolt connecting holes and nuts, and the two cushion blocks are fixed together through the two flat head pins at the positions of the positioning holes. The utility model effectively solves the problems of insufficient stability and insufficient friction force in the prior art. According to the utility model, not only is the contact area with the bracing wire increased, but also the friction force is obviously improved through the rough knurling, and the bracing wire is fixed more firmly. And the spherical groove can accommodate the steel ball block welded at the tail end of the bracing wire test piece, so that the bracing wire is further locked, and the fixing effect is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of aircraft tension line stretching and fatigue test, and specifically relates to a test tool fixture. BACKGROUND

[0002] In the field of aviation, the stretching and fatigue test of aircraft tension line is crucial to ensure flight safety. When conducting such tests, traditional tool fixtures mainly use ordinary knurling methods to increase the roughness of the contact surface to improve friction, in the hope of better fixing the aircraft landing tension line. However, this method has significant limitations: it can only fix the tension line by increasing friction unilaterally, while ignoring the overall stability of the fixing structure and the convenience of operation. In practical applications, this design may result in insufficient stability, and the friction may not be strong enough to firmly hold the tension line, leading to large errors under high-load test conditions, or even causing the test piece to come out, resulting in test failure. In addition, the structure of the traditional fixture is often complex, which not only increases the manufacturing cost, but also increases the maintenance difficulty, which is not conducive to rapid deployment and use in variable test environments.

[0003] To address the above problems, although some improved tool fixtures have emerged, such as the fatigue test fixture for plate-shaped samples described in patent CN114577591A, which solves the problem of fixing plate-shaped samples by opening grooves on the fixture base, reducing processing costs, and enabling repeated use on multiple fatigue machines when the sample shape is fixed, improving the clamping stability of plate-shaped samples during fatigue testing with MTS fatigue machines. However, these improved tool fixtures are either difficult to operate due to complex design, or are not easy to promote due to high cost, or cannot meet the strict requirements of aircraft tension line fatigue testing due to insufficient stability and friction. Therefore, there is an urgent need in the industry for a new type of test tool fixture that can provide sufficient friction to firmly hold the tension line, ensure the stability of the structure, and be easy to operate and maintain to meet the high standards of aircraft tension line fatigue testing. SUMMARY

[0004] The utility model aims at providing a test tool fixture to solve the problems of insufficient stability, insufficient friction, complex operation, and high cost of existing aircraft tension line fatigue test tool fixtures.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted.

[0006] A test tool fixture, comprising:

[0007] Two pads for relative arrangement, the opposite sides of the two pads are respectively provided with long grooves along the length direction, and the surface of the long grooves is provided with rough knurling; the same end of the long grooves of the two pads is respectively provided with a spherical groove;

[0008] The two pads are also provided with bolt connection holes and positioning holes;

[0009] The two pads are connected and fixed by bolts passing through the bolt connection holes and nuts, and the two pads are fixed together at the positions of the positioning holes by two flat-head pins.

[0010] Optionally, the pad is made of 45# steel.

[0011] Optionally, when the two pads are fixed together, the two spherical grooves can be combined to form a hemisphere.

[0012] Optionally, the bolt connection holes are symmetrically distributed on both sides of the long groove, and there are two positioning holes, which are respectively set at the diagonal positions of the pad.

[0013] Optionally, the first end of the pad is arc-shaped, the second end is planar, and the spherical groove is disposed at the second end.

[0014] Optionally, the cross-section of the long groove is semi-circular.

[0015] Optionally, the diameter of the spherical groove is larger than the cross-sectional diameter of the long groove.

[0016] Optionally, the long groove extends through both ends of the pad.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The test fixture provided in this application effectively solves the problems of insufficient stability and friction in existing technologies through its unique design. The fixture includes two opposing pads, each with a long groove along its length. The surface of the groove is roughened with knurling. This design not only increases the contact area with the tension wire but also significantly improves friction through the knurling, thus more firmly fixing the tension wire. Furthermore, one end of each pad has a spherical groove. When the two pads are fixed, the spherical grooves combine to form a hemisphere. This design can accommodate the steel ball welded to the end of the tension wire test piece, further locking the tension wire and enhancing the fixing effect between the fixture and the tension wire. The connection method using bolts, nuts, and flat-head pins allows the two pads to be quickly and stably fixed together, improving the stability and ease of operation of the fixture.

[0019] The spacers are made of 45# steel, a material whose excellent mechanical properties ensure the strength and durability of the clamp during high-load tests. The spherical grooves can be combined to form a hemisphere, enhancing the contact stability between the clamp and the tension wire and allowing the clamp to adapt to tension wires of different sizes, thus improving its applicability. The distribution of bolt holes and positioning holes makes the connection between the spacers more secure, and the diagonally positioned positioning holes help distribute force, improving the overall structural stability. The design of one end of the spacer being arc-shaped and the other end being flat allows the clamp to better adapt to the shape of the tension wire, improving clamping stability. The semi-circular cross-section of the long groove and the design of the spherical groove diameter being larger than the long groove cross-section diameter further ensure a tight fit between the tension wire and the clamp, improving the clamp's fixing effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the test fixture of this utility model.

[0021] Figure 2 This is a schematic diagram of the pad structure of an embodiment of the test fixture of this utility model.

[0022] The components include: 1. pad block; 2. long groove; 3. spherical groove; 4. bolt connection hole; 5. positioning hole. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0024] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention.

[0025] Example 1

[0026] like Figure 1 and Figure 2 As shown, a test fixture mainly includes two pads 1, which are designed to be positioned opposite each other, i.e., they can be placed face-to-face to clamp an object. On the opposite side of each pad 1, i.e., the side that contacts the other pad 1, a long groove 2 is provided along its length. The inner surface of these long grooves 2 is designed to be rough knurled to increase the friction between the groove and the clamped object, thereby providing a more stable clamping effect.

[0027] At the same end of the long groove 2 of each pad 1, i.e., at the end of the two long grooves 2, a spherical groove 3 is provided. These spherical grooves 3 are designed to accommodate the spherical end of the clamped object, such as the steel ball welded to the end of the aircraft tension test piece, so as to achieve locking and fixation of the object.

[0028] To secure the two pads 1 together, each pad 1 is provided with a bolt connection hole 4 and a positioning hole 5. The bolt connection hole 4 is for passing a bolt through so that the two pads 1 can be connected and secured by a bolt and nut. The positioning hole 5 is for inserting a flat-head pin to ensure that the two pads 1 are fixed in position after connection and to prevent relative movement during use.

[0029] In practice, bolts pass through the bolt connection holes 4 of the two pads 1, and the pads 1 are tightly connected by nuts. Simultaneously, two flat-head pins are inserted into the positioning holes 5 of the two pads 1, ensuring that the pads 1 do not shift relative to each other under external force, thus enhancing the overall stability of the fixture. This structural design is simple and effective, providing sufficient friction and clamping force, and facilitating quick installation and disassembly. It is suitable for tensile and fatigue tests on aircraft tension lines.

[0030] In practical applications, this tooling fixture can be operated according to the following steps: First, place two pads 1 opposite each other so that their long grooves 2 are aligned; then, pass the bolt through the bolt connection hole 4 and fix it with a nut; next, insert the flat-head pin into the positioning hole 5 to complete the fixing of the pads 1; finally, insert the test piece of the aircraft tension line into the spherical groove 3 of the pad 1, and use the rough knurling of the long groove 2 to increase the friction and achieve stable clamping of the tension line.

[0031] The tooling fixture is designed with ease of operation and stability in mind. It achieves efficient and reliable clamping through a simple mechanical structure, making it suitable for various occasions that require precise clamping. It performs particularly well in fatigue tests of aircraft tension lines.

[0032] As a specific example, the pad 1 of this tooling fixture is made of 45# steel, a material widely used for its excellent mechanical and machinability properties, ensuring the strength and durability of the fixture under high loads. Each pad 1 has an arc-shaped end and a flat end, a design that contributes to its stability and adaptability in different directions. At the flat end, the second end, of the pad 1, there is a spherical groove 3. These grooves 3 engage with each other when two pads 1 are fixed together, forming a complete hemispherical structure that tightly wraps and locks the steel ball of the aircraft tensioner.

[0033] The long groove 2 on the pad 1 has a semi-circular cross-section. This design not only enhances the strength of the long groove 2 but also matches the shape of the aircraft tension line, providing a better clamping effect. The long groove 2 runs through both ends of the pad 1, making the entire pad 1 a continuous structure and enhancing the overall rigidity of the clamp. The surface of the long groove 2 is rough knurled to increase the friction between it and the clamped object.

[0034] To enhance the connection stability between the pads 1, multiple bolt connection holes 4 are designed, distributed in pairs on both sides of the long groove 2. This layout allows the bolts to evenly tighten the two pads 1, ensuring the stability of the clamp under stress. Two positioning holes 5 are designed, located diagonally opposite each other on the pads 1. This design helps to further fix the position of the pads 1 after the flat-head pin is inserted, preventing displacement during use.

[0035] Furthermore, the diameter of the spherical groove 3 is designed to be larger than the diameter of the cross-section of the long groove 2. This design allows the spherical groove 3 to better accommodate steel spheres of different sizes, improving the versatility and applicability of the fixture. The fit between the semi-circular cross-section of the long groove 2 and the spherical groove 3 enables the fixture to clamp the aircraft tension wire more tightly and stably, maintaining stability even under high-load tensile and fatigue tests.

[0036] In summary, the design of this test fixture takes into account material selection, structural stability, ease of operation, and adaptability. Precise dimensional and shape design ensures the fixture's high efficiency and reliability in practical applications. The design and manufacture of this fixture are carried out in accordance with the detailed specifications described above to ensure it meets the stringent requirements of aircraft tension fatigue testing.

[0037] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A test fixture clamp characterized by, The utility model relates to a kind of relative setting pad (1), two long grooves (2) are respectively arranged in length direction on the opposite side of two pad (1), the surface of long groove (2) is provided with rough knurling;Two long grooves (2) of two pad (1) are respectively provided with spherical groove (3) in the same end. Two pad (1) are further provided with bolt connection hole (4) and positioning hole (5). Two pad (1) are connected and fixed by bolt passing through bolt connection hole (4) and nut, and two flat pin are fixed in the position of positioning hole (5) to fix two pad (1) together. The pad (1) is made of 45 steel material.

2. A test fixture clamp according to claim 1, wherein, When two pad (1) are fixed together, two spherical grooves (3) can be combined into hemispherical shape.

3. A test fixture clamp according to claim 1, wherein, The bolt connection hole (4) has multiple, and is symmetrically distributed on the two sides of long groove (2), and the positioning hole (5) has two, and is respectively arranged in the diagonal position of pad (1).

4. A test fixture clamp according to claim 1, wherein, The first end of the pad (1) is circular arc, and the second end is planar, and the spherical groove (3) is arranged on the second end.

5. A test fixture clamp according to claim 1 wherein, The cross section of the long groove (2) is semicircular.

6. A test fixture clamp according to claim 1, wherein, The diameter of the spherical groove (3) is greater than the cross-sectional diameter of the long groove (2).

7. A test fixture clamp according to claim 6, wherein, The long groove (2) penetrates the two ends of the pad (1).

8. A test fixture clamp according to claim 1 wherein, ​

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