Fixing clamp for tensile fatigue test of conical engineering plastic retainer

Abstract

The utility model belongs to the field of test fixture detection, and particularly relates to a fixing fixture for a tensile fatigue test of a conical engineering plastic retainer, which comprises a clamping connecting plate, a large-end fixing baffle plate, a small-end fixing baffle plate, a rotatable pulling plate and a rotatable limiting block, the large-end fixing baffle and the small-end fixing baffle are fixedly connected to the clamping connecting plate, and the large-end fixing baffle abuts against the end face of the large end of the conical engineering plastic retainer and is attached to the end face of the large end. The small-end fixing baffle plate is propped against the outer diameter surface of the small end of the conical engineering plastic retainer and is attached to the outer diameter surface of the small end; the rotatable pulling plate is assembled in the holder window hole and hinged to the clamping connecting plate, and the rotatable limiting block is hinged to the rotatable pulling plate and attached to the holder window beam in parallel. The fixture can be used for fixedly clamping the conical engineering plastic retainer, simulating the state and the performance of the retainer in the use process of a bearing, and completing an anti-fatigue test. Interference of other assemblies is avoided, and performance measurement work is completed.

Description

Technical Field

[0001] This utility model belongs to the field of test fixture testing, specifically relating to a fixing fixture for tensile fatigue testing of a conical engineering plastic cage. Background Technology

[0002] Currently, all tapered plastic bearing cages use a tapered roller design, characterized by tapered apertures. Their fatigue resistance in actual use can only be assessed through assembly onto the bearing and subsequent running tests. This testing method is extremely expensive and time-consuming. If the plastic cage fails to meet standards, the entire bearing assembly must be re-verified, which is labor-intensive and time-consuming. Furthermore, newly designed bearings require testing of their inner ring, outer ring, rolling elements, and other components. If a bearing problem is found, it's difficult to determine whether the issue stems from the plastic cage. Therefore, a separate fatigue testing fixture is needed to perform individual fatigue tests on the plastic bearing cages on a fatigue testing machine. Summary of the Invention

[0003] In view of the deficiencies of the existing technology, and in order to solve the problem of testing the tensile fatigue performance of tapered engineering plastic cages for bearings, the purpose of this utility model is to provide a fixing fixture for testing the tensile fatigue performance of tapered engineering plastic cages for bearings, and to conduct a separate durability test on the tensile fatigue performance of tapered engineering plastic cages for bearings.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a fixing clamp for tensile fatigue testing of a conical engineering plastic cage, comprising a clamping connecting plate, a large-end fixing baffle, a small-end fixing baffle, a rotatable pull plate, and a rotatable limiting block; the large-end fixing baffle and the small-end fixing baffle are fixedly connected to the clamping connecting plate, the large-end fixing baffle abuts against the end face of the large end of the conical engineering plastic cage and is in contact with the end face of the large end; the small-end fixing baffle abuts against the outer diameter surface of the small end of the conical engineering plastic cage and is in contact with the outer diameter surface of the small end; the rotatable pull plate is assembled in the cage window hole and hinged to the clamping connecting plate, and the rotatable limiting block is hinged to the rotatable pull plate and is parallel to and in contact with the cage window beam.

[0005] Based on the above technical solution, the clamping connecting plate, small end fixing baffle, and large end fixing baffle of the clamp are made of quenched material, which has high hardness and strength, and is resistant to acid, alkali and corrosion, while also having excellent rust prevention and impact resistance.

[0006] Furthermore, the outer diameter surface of the large end of the conical engineering plastic retainer is in contact with the surface of the clamping connecting plate, and the axis of the conical engineering plastic retainer is parallel to the clamping connecting plate.

[0007] Furthermore, the large-end fixed baffle is an L-shaped structure formed by the large-end baffle connecting part and the large-end baffle limiting part. The large-end baffle connecting part is connected to the clamping connecting plate by fastening screws. The inner surface of the large-end baffle limiting part is flat and fits against the large end face of the conical engineering plastic retainer.

[0008] Furthermore, the small end fixing baffle is an L-shaped structure formed by the small end baffle connecting part and the small end baffle limiting part. The small end baffle connecting part is connected to the clamping connecting plate by fastening screws. The end face of the small end baffle limiting part away from the small end baffle connecting part is the abutting surface. The abutting surface of the small end baffle limiting part is a conical surface that matches the outer diameter surface of the small end of the conical engineering plastic cage. The abutting surface of the small end baffle limiting part is in contact with the outer diameter surface of the small end of the conical engineering plastic cage.

[0009] Based on the above technical solution, the small-end fixing baffle and the large-end fixing baffle of the clamp are designed to fit the outer diameter of the small end and the large end of the tapered engineering plastic cage for bearings, so that the engineering plastic cage for bearings can fit perfectly with the overall clamp. By tightening the fastening screws, the clamp is ensured to be safe, reliable and without gaps, ensuring that the tapered engineering plastic cage for bearings does not move or resonate during the experiment, thus ensuring the accuracy and effectiveness of the experiment.

[0010] Furthermore, the clamping connecting plate is provided with mounting threaded holes on both sides. The two mounting threaded holes are used to connect the large end fixing baffle and the small end fixing baffle, respectively. The clamping connecting plate is provided with mounting holes, which are used to connect with the rotatable pull plate shaft, so that the rotatable pull plate can rotate on the clamping connecting plate.

[0011] Furthermore, the clamping connecting plate is clamped on the clamping fixture of the tensile testing machine, and the clamped portion of the clamping connecting plate is provided with a knurled surface to increase friction.

[0012] Based on the above technical solution, the top of the clamping connecting plate of the fixture has a knurled design to ensure a tight fit with the clamping fixture of the tensile fatigue testing machine and to keep it firmly fixed during the experiment. The bottom has a precision positioning mounting hole to ensure the relative position of the small end fixed baffle, the rotatable pull plate and the large end fixed baffle. The mounting hole is made of high precision slow wire EDM, which has high precision, good surface finish and accurate positioning.

[0013] Furthermore, a rotating shaft for hinged clamping connecting plate is provided on one side of the rotatable pull plate. The rotating shaft and the rotatable pull plate are integral structures. The head of the rotating shaft is threaded. The rotating shaft is locked to a fastening stainless steel nut through the thread on the head. The fastening stainless steel nut is pressed against the clamping connecting plate. The rotatable pull plate is provided with a limiting screw hole for hinged rotatable limiting block.

[0014] Based on the above technical solution, the rotatable pull plate of the clamp is an integrated design. One side of the pull plate is designed with a threaded rotating shaft. One end of the rotating shaft is threaded and fixed in place with a fastening stainless steel nut. Laser welding technology is used to weld the stainless steel nut and the rotating shaft together, ensuring that the rotatable pull plate can rotate freely on the upper and lower connecting plates, while also having a certain tight fit. This ensures that there is a gap but no loosening while rotating, and has high precision.

[0015] Furthermore, the rotatable limiting block is provided with limiting screw holes corresponding to the rotatable pull plate. The rotatable limiting block can be rotated relative to the rotatable pull plate to adjust the angle and fixed by the limiting screws, so that the rotatable limiting block and the retainer window beam remain parallel and in contact.

[0016] Based on the above technical solution, the rotatable limiting block of the clamp is made of high-impact stainless steel, which is not only acid- and alkali-resistant, corrosion-resistant, rust-proof, and impact-resistant, but also has excellent toughness, capable of withstanding millions of stress impacts without deformation or breakage. The rotatable limiting block of the clamp is fixed to the rotatable pull plate by limiting screws, and it fits tightly against the window beam part of the conical engineering plastic cage for the bearing, ensuring horizontal positional stability and effectiveness during testing.

[0017] Furthermore, the fixing clamps are used in two sets simultaneously, and the two sets of fixing clamps are symmetrically arranged. Each set of fixing clamps includes a clamping connecting plate, a large end fixing baffle, a small end fixing baffle, a rotatable pull plate, and a rotatable limiting block. The two sets of fixing clamps are fixed as a whole on the tensile fatigue testing machine.

[0018] Furthermore, the test conical engineering plastic retainer mounted on the fixing fixture is a retainer module that has been cut off and retains at least one pocket and window beams on both sides of the pocket.

[0019] Furthermore, two rotatable pull plates in the two sets of fixing clamps are assembled in a retainer window hole, and two rotatable limiting blocks are set opposite to the two rotatable pull plates. The two rotatable limiting blocks are respectively parallel and attached to the two adjacent retainer window beams. The two sets of fixing clamps are clamped on the clamping fixture of the tensile testing machine through two clamping connecting plates.

[0020] The beneficial effects of this invention are as follows: The fixing fixture for fatigue testing can fix and clamp a tapered engineering plastic cage on a fatigue testing machine, simulating the state and performance of the engineering plastic cage during bearing use, and completing an individual fatigue test on the engineering plastic cage used in bearings. This avoids interference from other components and allows for performance determination before the entire bearing assembly, ensuring the normal operation and testing of the entire bearing system. It not only reduces testing costs but also mitigates risks, saving time and effort. Attached Figure Description

[0021] Figure 1 Front view of the fixing fixture used for tensile fatigue testing of conical engineering plastic cages;

[0022] Figure 2 Main view of clamp fastening screw installation;

[0023] Figure 3 Top view of the clamp fastening screw installation;

[0024] Figure 4 This is a schematic diagram showing the location of the mounting holes for the clamping connecting plate;

[0025] Figure 5 This is the main view of the rotatable pull plate;

[0026] Figure 6 Top view of the rotatable pull plate;

[0027] Figure 7 This is the main view of the rotatable limit block;

[0028] Figure 8 Top view of the rotatable limiting block;

[0029] Figure 9 Main view of the fixed baffle at the large end;

[0030] Figure 10 Top view of the fixed baffle at the large end;

[0031] Figure 11 Schematic diagram of two small-end fixed baffles;

[0032] Figure 12 Top view of the fixed baffle at the small end;

[0033] Figure 13 A schematic diagram of the assembly of the small-end fixed baffle;

[0034] Figure 14 Axonometric drawing of a fixing fixture for tensile fatigue testing of a conical engineering plastic cage;

[0035] In the picture:

[0036] 1. Clamping connecting plate; 101. Mounting threaded hole; 102. Mounting hole; 103. Knurled surface;

[0037] 2. Rotatable pull plate; 201. Rotating shaft; 2011. Thread; 202. Rotatable pull plate limiting screw hole; 203. First rounded chamfer; 204. Second rounded chamfer.

[0038] 3. Small end fixed baffle; 301. Small end baffle connecting part; 302. Small end baffle limiting part; 303. Small end baffle limiting part abutting surface;

[0039] 4. Large end fixed baffle; 401. Large end baffle connecting part; 402. Large end baffle limiting part; 403. Inner surface of the large end baffle limiting part;

[0040] 5. Rotatable limit block; 501. Rotatable limit block limit screw hole;

[0041] 6. Conical engineering plastic cage for bearings; 601. Cage window; 602. Cage window beam; 603. Large end of cage; 604. Small end of cage;

[0042] 7. Tighten the screws.

[0043] 8. Limit screws,

[0044] 9. Tighten the stainless steel nuts. Detailed Implementation

[0045] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0046] This utility model relates to a tensile fatigue testing fixture for tapered engineering plastic cages. It is used to simulate the fatigue resistance of tapered engineering plastic cages during actual use, and to simulate the state and performance of engineering plastic cage products during bearing use, thereby verifying their fatigue resistance. This fixture is specially designed and manufactured for the shape and size of tapered engineering plastic cages, and belongs to the field of testing fixtures.

[0047] See appendix Figure 1-14A fixing fixture for tensile fatigue testing of a conical engineering plastic cage is disclosed. This fixture is used for a separate durability test of the tensile fatigue performance of a conical engineering plastic cage for bearings. The fixing fixture consists of two sets, symmetrically arranged and used simultaneously. Each set includes a clamping connecting plate 1, a large-end fixing baffle 4, a small-end fixing baffle 3, a rotatable pull plate 2, and a rotatable limiting block 5. The large-end fixing baffle 4 and the small-end fixing baffle 3 are fixedly connected to the clamping connecting plate 1. The large-end fixing baffle 4 abuts against the end face of the large end of the conical engineering plastic cage 6 and is in contact with the large-end end face. The small-end fixing baffle 3 abuts against the outer diameter surface of the small end of the conical engineering plastic cage 6 and is in contact with the outer diameter surface of the small end. The rotatable pull plate 2 is assembled inside the cage window hole 601 and hinged to the clamping connecting plate 1. The rotatable limiting block 5 is hinged to the rotatable pull plate 2 and is parallel to and in contact with the cage window beam 602. The test conical engineering plastic retainer mounted on the fixing fixture is a retainer module that has been cut off and retains at least one pocket and the window beams on both sides of the pocket.

[0048] Furthermore, the outer diameter surface of the large end of the conical engineering plastic retainer 6 is in contact with the surface of the clamping connecting plate 1, and the axis of the conical engineering plastic retainer 6 is parallel to the clamping connecting plate 1.

[0049] Furthermore, the large end fixing baffle 4 is an L-shaped structure formed by the large end baffle connecting part 401 and the large end baffle limiting part 402. The large end baffle connecting part 401 is connected to the clamping connecting plate 1 by fastening screws 7. The inner surface of the large end baffle limiting part 402 is flat, and the inner surface of the large end baffle limiting part 402 is in contact with the large end face of the retainer.

[0050] Furthermore, the small end fixing baffle 3 is an L-shaped structure formed by the small end baffle connecting part 301 and the small end baffle limiting part 302. The small end baffle connecting part 301 is connected to the clamping connecting plate 1 by fastening screws 7. The end face of the small end baffle limiting part 302 away from the small end baffle connecting part 301 is the abutting surface 303. The abutting surface 303 of the small end baffle limiting part is a conical surface that matches the outer diameter surface of the small end of the conical engineering plastic cage. The abutting surface 303 of the small end baffle limiting part is in contact with the outer diameter surface of the small end of the conical engineering plastic cage.

[0051] Furthermore, the clamping connecting plate 1 is provided with mounting threaded holes 101 on both sides. The two mounting threaded holes 101 are used to fasten the screw 7 by connecting the large end fixing baffle 4 and the small end fixing baffle 3 respectively. The clamping connecting plate 1 is provided with mounting holes 102, which are used to connect with the rotatable pull plate 2 shaft, so that the rotatable pull plate 2 can rotate on the clamping connecting plate 1.

[0052] Furthermore, the clamping connecting plate 1 is clamped on the clamping fixture of the tensile testing machine, and the clamped part of the clamping connecting plate is provided with a knurled surface 103 for increasing friction.

[0053] Furthermore, a rotating shaft 201 for hinged clamping of the connecting plate is provided on one side of the rotatable pull plate 2. The rotating shaft 201 and the main body of the rotatable pull plate are integrally formed. The head of the rotating shaft 201 is machined with a thread 2011. The rotating shaft 201 is locked to the fastening stainless steel nut 9 through the thread 2011 on the head. The fastening stainless steel nut 9 is pressed against the clamping connecting plate 1. The rotatable pull plate 2 is provided with a limiting screw hole 202 for hinged rotatable limiting block 5. The two sides of the rotatable pull plate 2 are transitioned by a first rounded chamfer 203, and the rotating shaft 201 and the main body of the rotatable pull plate are transitioned by a second rounded chamfer 204.

[0054] Furthermore, the rotatable limiting block 5 is provided with a rotatable limiting block limiting screw hole 501 corresponding to the rotatable pull plate limiting screw hole 202. The rotatable limiting block 5 can be rotated relative to the rotatable pull plate 2 to adjust the angle and fixed by the limiting screw 8, so that the rotatable limiting block 5 and the retainer window beam 602 remain parallel and in contact.

[0055] Furthermore, the fixing clamps are used in two sets simultaneously, and the two sets of fixing clamps are symmetrically arranged. Each set of fixing clamps includes a clamping connecting plate 1, a large end fixing baffle 4, a small end fixing baffle 3, a rotatable pull plate 2, and a rotatable limiting block 5. The two sets of fixing clamps are fixed as a whole on the tensile fatigue testing machine.

[0056] Furthermore, two rotatable pull plates 2 of the two sets of fixing clamps are assembled in a retainer window hole 601, and two rotatable limiting blocks 5 are set opposite to the two rotatable pull plates 2. The two rotatable limiting blocks 5 are respectively parallel and attached to the two adjacent retainer window beams 602. The two sets of fixing clamps are clamped on the clamping fixture of the tensile testing machine through two clamping connecting plates 1.

[0057] The clamp mainly consists of seven parts: the first part is the clamping connecting plate 1, the second part is the rotatable pull plate 2, the third part is the small end fixed baffle 3, the fourth part is the large end fixed baffle 4, the fifth part is the rotatable limiting block 5, the sixth part is the bearing conical engineering plastic retainer 6, and the seventh part is the fastening screw 7, the limiting screw 8, and the fastening stainless steel nut 9. The upper and lower clamping connecting plates 1, the small end fixed baffle 2, and the large end fixed baffle 4 of this utility model clamp are made of quenched material, and the rotatable limiting block 5 is made of high impact-resistant stainless steel. The top of the upper and lower clamping connecting plates 1 has a knurled design to ensure a tight fit with the clamping fixture of the tensile fatigue testing machine. At the same time, its bottom end is designed with precision mounting threaded holes 101 and mounting holes 102 to ensure the relative position of the small end fixed baffle 3, the large end fixed baffle 4, and the rotatable pull plate 2. The mounting threaded holes 101 and mounting holes 102 are made of high-precision slow wire EDM, with high precision, good surface finish, and accurate positioning. The rotatable pull plate 2 is a one-piece design. One side of the rotatable pull plate 2 has a threaded rotating shaft 201, with a thread 2011 at one end. After being fixed in position with the fastening stainless steel nut 9, the stainless steel nut and rotating shaft are welded together using laser welding technology. This ensures that the rotatable pull plate 2 can rotate freely on the clamping connecting plate 1 while maintaining a certain tight fit, ensuring high precision with sufficient clearance for rotation. The stainless steel nut is welded to the rotating shaft, and the tightness of the rotating shaft can be adjusted by changing the position of the nut, ensuring that the rotating shaft can rotate freely without excessive clearance, loosening, or shifting. The welded rotatable pull plate 2 is disposable; if it deforms or breaks, it needs to be remanufactured and the stainless steel nut rewelded. The rotatable limiting block 5 is fixed to the rotatable pull plate 2 by limiting screws 8. It fits tightly against the window beam 602 of the bearing's conical engineering plastic retainer, ensuring horizontal positional stability and effectiveness during testing. The small-end fixing baffle 3 and the large-end fixing baffle 4 are designed to fit the outer diameter shapes of the small and large ends of the tapered plastic bearing cage, allowing the tapered plastic bearing cage 6 to fit perfectly with the overall clamp. The clamp is then locked in place by the fastening screws 7, ensuring a safe, reliable, and gap-free clamping system. This unique and precise design of the clamp as a whole guarantees the reliability and effectiveness of the tensile fatigue test on the tapered plastic bearing cage, and has profound significance for future research on the actual performance and application of tapered plastic bearing cages.

[0058] like Figure 1 The front view shows the assembled state of the bearing tapered plastic cage tensile fatigue test fixture. The upper part of the fixture features a knurled portion of the clamping connecting plate 1, which can be clamped and fixed by the tooling of the tensile testing machine. The knurled portion 103 designed on the clamping connecting plate 1 effectively increases the friction during clamping, ensuring the fixture's safety and reliability. Figure 2 As shown in the installation diagram of the clamp fastening screws, the rotatable pull plate 2, the small end fixing baffle 3, and the large end fixing baffle 4 are fixedly installed on the clamping connecting plate 1 by fastening screws 7 and fastening stainless steel nuts 9. The rotatable limit block 5 is fixedly installed on the rotatable pull plate 2 by limit screws 8; as shown in the diagram. Figure 3 The schematic diagram of the mounting hole positions on the clamping connecting plate is shown. The clamping connecting plate 1 is designed with mounting holes 102, whose positions are precisely achieved through wire cutting, resulting in a smooth inner surface. The mounting threaded holes 101 are machined using electrical discharge machining, which offers higher precision, more accurate positioning, and a more regular thread shape compared to conventional wire twisting. This overall machining design precisely secures the tapered engineering plastic cage 6 for the bearing in the vertical direction during testing.

[0059] like Figure 5 , 6 As shown, a rotating shaft 201 is designed on one side of the rotatable pull plate 2. It is an integral part of the rotatable pull plate and is made of high-toughness, impact-resistant stainless steel. The head of the rotating shaft 201 is threaded 2011. After passing through the mounting hole 102 of the clamping connecting plate 1, it is locked with a fastening stainless steel nut 9, ensuring that it can rotate within the clamping connecting plate 1 while maintaining a tight fit without slippage or vibration. The fastening stainless steel nut 9 is welded to the rotating shaft 201 of the rotatable pull plate using laser welding technology, ensuring its strength and tightness. A limit screw hole 202 is designed on the rotatable pull plate 2 according to the dimensions of the bearing tapered engineering plastic cage 6 and the window beam structure. This hole is also machined by electrical discharge machining, ensuring the accuracy and position of its threads. Figure 2 , 3 and Figure 7 , 8 As shown, the rotatable limiting block 5 is installed on the rotatable pull plate 2 by the limiting screw 8. By rotating and adjusting the angle, it is kept parallel and in contact with the window beam of the bearing conical engineering plastic cage 6, ensuring the horizontal position of the bearing conical engineering plastic cage 6 in the entire fixture, thus ensuring the reliability and accuracy of the test.

[0060] like Figure 2 , 3 and Figure 9-13 As shown, two sets of small-end fixing baffles 3 and large-end fixing baffles 4 are installed on both sides of the upper and lower clamping connecting plates 1 by fastening screws 7. Figure 13 As shown, the conical surface of the outer diameter of the small end of the tapered engineering plastic cage 6 is parallel and fits against the abutting surface of the end of the small end fixing baffle 3, and the end face of the large end of the tapered engineering plastic cage 6 is parallel and fits against the inner surface of the large end fixing baffle 4. This ensures the vertical position of the tapered engineering plastic cage 6 in the overall fixture, thus ensuring the reliability and accuracy of the test.

[0061] like Figure 14 As shown, under test conditions, without rolling elements installed, a section of the cage is cut off for testing. The entire tapered plastic bearing cage tensile fatigue test fixture is divided into upper and lower halves, forming a symmetrical structure. The entire structure is fixed by a tensile fatigue testing machine for testing. The test simulates the destructive effects of external forces such as vibration and tension on the tapered plastic bearing cage during actual use. Under high-frequency vibration, the rolling elements will continuously impact the beam portion of the tapered plastic bearing cage. The test simulates whether the tensile fatigue performance of the tapered plastic bearing cage meets the requirements for long-term bearing operation on rails. Verifying the reliability and safety of the tapered plastic bearing cage through testing ensures vehicle operation safety and has profound significance for future bearing maintenance and repair cycles.

[0062] It should be noted that the parts of this utility model not described in detail are existing technologies.

[0063] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are 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 are not intended to 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.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0068] The above-listed embodiments are merely preferred embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A fixture for use in a tensile fatigue test of a conical engineering plastic cage, characterized in that: The utility model provides a kind of fixed fixture for the tensile fatigue test of conical engineering plastic holder, including clamping connecting plate, big end fixed baffle, small end fixed baffle, rotatable pull plate and rotatable limit block;Big end fixed baffle and small end fixed baffle are fixedly connected on clamping connecting plate, and big end fixed baffle is supported on the end face of the big end of conical engineering plastic holder, and is attached to big end face;Small end fixed baffle is supported on the outer diameter surface of the small end of conical engineering plastic holder, and is attached to small end outer diameter surface;Rotatable pull plate is assembled in holder window hole and is hinged with clamping connecting plate, and rotatable limit block is hinged with rotatable pull plate and is attached to holder window beam.

2. The fixture for the tensile fatigue test of a conical plastic holder according to claim 1, characterized in that: The outer diameter surface of the big end of the conical engineering plastic holder is attached to the surface of the clamping connecting plate, and the axis of the conical engineering plastic holder is parallel to the clamping connecting plate.

3. The fixture for the tensile fatigue test of a conical plastic holder according to claim 1, characterized in that: The big end fixed baffle is L-shaped structure formed by big end baffle connecting part and big end baffle limiting part, the big end baffle connecting part is connected with the clamping connecting plate by fastening screw, the inner surface of the big end baffle limiting part is flat, and the inner surface of the big end baffle limiting part is attached to the end face of the big end of the conical engineering plastic holder.

4. The fixture for the tensile fatigue test of conical plastic holder according to claim 1, characterized in that: The small end fixed baffle is L-shaped structure formed by small end baffle connecting part and small end baffle limiting part, the small end baffle connecting part is connected with the clamping connecting plate by fastening screw, and the end face of the small end baffle limiting part away from the small end baffle connecting part is the supporting face, the supporting face of the small end baffle limiting part is conical surface matched with the outer diameter surface of the small end of the conical engineering plastic holder, and the supporting face of the small end baffle limiting part is attached to the outer diameter surface of the small end of the conical engineering plastic holder.

5. The fixture for the tensile fatigue test of conical plastic holder according to claim 1, characterized in that: Both sides of the clamping connecting plate are provided with mounting threaded holes, and the two mounting threaded holes are respectively used for connecting the big end fixed baffle and the small end fixed baffle, the clamping connecting plate is provided with mounting hole, the mounting hole is used for connecting with the shaft of the rotatable pull plate to make the rotatable pull plate rotate on the clamping connecting plate.

6. The fixture for the tensile fatigue test of conical plastic holder according to claim 1, characterized in that: The clamping connecting plate is clamped on the clamping tool of the tensile testing machine, and the clamped part of the clamping connecting plate is provided with knurled surface for increasing friction.

7. The fixture for the tensile fatigue test of conical plastic holder according to claim 1, characterized in that: One side of the rotatable pull plate is provided with rotating shaft for hinging the clamping connecting plate, the rotating shaft is integrated with the rotatable pull plate, the head of the rotating shaft is processed with thread, the rotating shaft is locked by the thread of the head and the fastening white steel nut, and the fastening white steel nut is tightly pressed on the clamping connecting plate, and the rotatable pull plate is provided with limiting screw hole for hinging the rotatable limit block.

8. The fixture for the tensile fatigue test of conical plastic holder according to claim 1, characterized in that: The rotatable limit block is provided with limiting screw hole corresponding to the rotatable pull plate, the rotatable limit block is rotated and adjusted in angle relative to the rotatable pull plate and is fixed by limiting screw, so that the rotatable limit block is attached to the window beam of the holder.

9. The fixture for tensile fatigue test of conical plastic holder according to any one of claims 1-8, characterized in that: The fixed fixture is used simultaneously in two groups, and the two groups of fixed fixtures are symmetrically arranged, each group of fixed fixtures comprises clamping connecting plate, big end fixed baffle, small end fixed baffle, rotatable pull plate and rotatable limit block, and the two groups of fixed fixtures are fixed as a whole on the tensile fatigue testing machine, and the conical engineering plastic holder to be tested mounted on the fixed fixture is a holder module with at least one pocket and window beam on both sides of the pocket.

10. The fixture for the tensile fatigue test of conical plastic holder according to claim 9, characterized in that: The two rotatable pull plates in the two sets of fixed clamps are assembled in a retainer window hole, two rotatable limiting blocks are arranged on the two rotatable pull plates in opposite directions, and the two rotatable limiting blocks are respectively and parallelly attached to the two adjacent retainer window beams; the two sets of fixed clamps are clamped on the clamping tool of the tensile testing machine through the two clamping connecting plates.

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