A bending fatigue testing device

Abstract

This invention provides a bending fatigue testing device, including a base, a testing body, a protective cover, and a locking assembly. The testing body is mounted on the base and includes a pair of clamps for holding the product under test and rotating along the same axis. The protective cover is located above the testing body and surrounds the outside of the clamps. One side of the bottom of the protective cover is hinged to the base, with its hinge axis parallel to the rotation axis of the clamps. The other side has at least one positioning protrusion. The base has a positioning groove and a sliding groove. The positioning protrusion can be engaged in the positioning groove, and the sliding groove communicates with the groove wall of the positioning groove. The locking assembly slides within the sliding groove and can lock the positioning protrusion. In this bending fatigue testing device, before testing, rotating the protective cover allows the positioning protrusion to insert into the positioning groove of the base. The locking assembly then limits the position, ensuring the protective cover stably covers the product under test, effectively improving testing safety.

Description

Technical Field

[0001] This utility model relates to the field of bending fatigue testing technology, and specifically to a bending fatigue testing device. Background Technology

[0002] Bending fatigue testing is a test method for determining the durability of materials under repeated or alternating bending loads. A bending fatigue testing machine simulates the fatigue failure process of materials under alternating stress by rotating the specimen and applying a constant bending moment. Typically, one end of the specimen is clamped to a rotating spindle, while the other end is free and suspended by weights to apply the bending moment. The specimen is then rotated at high speed, and the number of cycles at fracture is recorded for use in plotting SN curves or routine life testing.

[0003] Chinese patent CN202211121475.7 discloses a rotary bending fatigue testing machine, which includes a main shaft component, a table component, a tailstock component, a loading component, a fixture, and a frame component. A left guard, a right guard, and a movable guard are arranged on the upper part of the frame component. The movable guard is slidably connected between the left and right guards to shield the fixture and high-temperature furnace area during the test, preventing external debris from entering the test area and preventing parts such as samples and fixtures from flying out and causing injury. However, during use, small fragments or dust can still leak out from the gaps in the aforementioned rotary bending fatigue testing machine, posing a safety hazard. Utility Model Content

[0004] Therefore, in order to solve the problem of insufficient safety during the testing process, this utility model provides a bending fatigue testing device, the specific technical solution of which is as follows: A bending fatigue testing device includes a base, a test body, a protective cover, and a locking assembly. The test body is mounted on the base and includes a pair of clamps for holding the product under test and rotating along the same axis. The protective cover is located above the test body and surrounds the outside of the clamps. One side of the bottom of the protective cover is hinged to the base, with its hinge axis parallel to the rotation axis of the clamps. At least one positioning protrusion is provided on the other side. The base has a positioning groove and a sliding groove. The positioning protrusion can be engaged in the positioning groove, and the sliding groove communicates with the groove wall of the positioning groove. The locking assembly slides within the sliding groove and can lock the positioning protrusion.

[0005] The bending fatigue testing device of this utility model only requires rotating the protective cover before testing to allow the positioning protrusion to be accurately inserted into the positioning groove of the base. Then, the positioning protrusion is firmly limited in the positioning groove by the locking component, so that the protective cover is stably placed on top of the product to be tested without occupying extra lateral space, and at the same time improving the safety of the test.

[0006] Furthermore, the locking assembly includes a locking rod and a toggle block. The locking rod is slidably disposed within the sliding groove. A limiting hole is formed at the position of the positioning protrusion corresponding to the locking rod. The locking rod passes through the limiting hole to lock the positioning protrusion. A toggle groove is formed at the top of the base, connecting the sliding groove and the outside of the base. The toggle groove is arranged along the length direction of the sliding groove. The toggle block is slidably disposed within the toggle groove. One end of the toggle block is connected to one end of the locking rod, and the other end extends out of the toggle groove.

[0007] Furthermore, the locking assembly also includes a first elastic element, one end of which abuts against the bottom of the sliding groove, and the other end of which abuts against the side of the locking rod away from the limiting hole; a second elastic element is provided at the bottom of the positioning groove; when the locking rod is inserted into the limiting hole, the positioning protrusion presses down on the second elastic element. Through the above technical solution, the protective cover can be unlocked and locked without frequent manipulation of the toggle block, improving the efficiency of opening and closing the protective cover.

[0008] Furthermore, one end of the locking rod is inserted into the limiting hole, and a guide surface is provided facing the opening of the positioning groove. The guide surface is an inclined surface or an arc-shaped curved surface. With the above technical solution, the protective cover can be locked simply by pressing down, improving locking efficiency.

[0009] Furthermore, a handle is installed on the outer side wall of the protective cover away from the hinge.

[0010] Furthermore, the test body also includes a pair of rotating shafts, a loading element, a drive motor, and a pair of brackets. The two brackets are arranged opposite each other on the base and extend upward. The two rotating shafts are respectively and rotatably mounted on the brackets at intervals, and the axes of the two rotating shafts are coaxial. The two clamps are respectively mounted on the ends of the two rotating shafts that are close to each other. The drive motor is fixedly mounted on the base, and the output shaft of the drive motor is drivenly connected to the end of one of the rotating shafts away from the clamp. The loading element is used to apply a load to the product under test.

[0011] Furthermore, there are two loading components, which are respectively connected to the product under test near the two clamps. Each loading component includes a hanging arm, a bearing, a support plate, and several weights. The inner ring of the bearing is fitted onto the product under test. The top end of the hanging arm is connected to the outer ring of the bearing. The hanging arm extends towards the base. The support plate is located at the bottom of the hanging arm. The weights are engaged with the hanging arm and abut against the support plate. The base is provided with a clearance groove for the loading components to pass through.

[0012] Furthermore, the base is provided with at least one pair of slide rails extending parallel to the axis of the rotating shaft, and the two slide rails are located on both sides of the hanging arm; the slide rails are provided with limiting rods, the two ends of the limiting rods are respectively inserted into the two slide rails and perpendicular to the axis of the rotating shaft, the limiting rods can slide along the extension direction of the slide rails, and are provided with limiting grooves for the hanging arm to be inserted.

[0013] Furthermore, at least one end of the slide rail is provided with a fixing block. When the hanging arm is engaged in the limiting groove, the limiting rod abuts against the fixing block, so that the hanging arm is in a vertical state. Through the above technical solution, the swing amplitude of the hanging arm can be reduced after adding or removing weights, allowing the hanging arm to quickly return to a vertical state.

[0014] Furthermore, the bottom of the base is provided with several supporting rubber seats spaced circumferentially. This technical solution improves the overall structural stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the bending fatigue testing device of this utility model; Figure 2 This is a side sectional view of the locking component of this utility model; Figure 3 This is a top view of the bending fatigue testing device of this utility model after the protective cover has been removed; Figure 4 This is a schematic diagram of the installation structure of the loading component of this utility model; Figure 5 This is a schematic diagram of the installation structure of the limiting rod of this utility model.

[0016] Figure label: 1. Base; 11. Positioning groove; 12. Support rubber seat; 13. Sliding groove; 14. Actuating groove; 15. Second elastic element; 16. Alternating groove; 17. Slide rail; 18. Limiting rod; 181. Limiting groove; 19. Fixing block; 2. Test body; 21. Rotating shaft; 22. Clamp; 23. Loading element; 231. Hanging arm; 232. Bearing; 233. Support plate; 234. Weight; 24. Drive motor; 25. Bracket; 3. Protective cover; 31. Positioning protrusion; 311. Limiting hole; 32. Handle; 33. Recess; 4. Locking assembly; 42. Locking rod; 422. Guide surface; 44. Actuating block; 46. First elastic element. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit its scope of protection.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] In this utility model, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0021] The existing bending fatigue testing machine uses a sliding assembly structure for its protective cover, which occupies lateral space and does not have a corresponding locking mechanism. When the equipment vibrates during operation, the movable cover is prone to displacement, resulting in gaps at the sliding connection between it and the left and right covers. This may not only allow small fragments or dust to spill out from the gaps, but also weaken the sealing and protection effect on the test area, posing a safety hazard.

[0022] To address this issue, the applicant proposes a bending fatigue testing device with a flip-lock assembly for the protective cover. This device incorporates a locking component; when the protective cover is rotated to a fully closed state, the locking component achieves precise alignment and stable positioning, ensuring the protective cover tightly covers the product under test. This design eliminates the need for additional lateral space and avoids displacement and gaps caused by vibration, significantly improving the reliability and safety of the testing process.

[0023] Please see Figure 1-2 This is a schematic diagram of the overall structure of the bending fatigue testing device of this utility model. The bending fatigue testing device of this utility model includes a base 1, a test body 2, a protective cover 3, and a locking component 4. The test body 2 is mounted on the base 1, the protective cover 3 is placed above the base 1 and surrounds the rotating sample part of the test body 2, and the locking component 4 is used to lock the protective cover 3 to the base 1.

[0024] Specifically, please refer to Figure 3The test body 2 includes a pair of rotating shafts 21, a pair of clamps 22, a loading element 23, a drive motor 24, and a pair of supports 25. The two supports 25 are arranged opposite each other on the base 1 and extend upwards. The two rotating shafts 21 are respectively and rotatably mounted on the supports 25 at intervals, with the axes of the two rotating shafts 21 on the same straight line. The two clamps 22 are respectively mounted on the ends of the two rotating shafts 21 that are close to each other. The clamps 22 are three-jaw clamps, which are existing technology and will not be described in detail here. The two clamps 22 are used to fix the ends of the product under test. The drive motor 24 is fixedly mounted on the base 1, and the output shaft of the drive motor 24 is fixedly connected to the end of one of the rotating shafts 21 away from the clamp 22. The loading element 23 is used to apply a load to the product under test. In use, both ends of the product under test are clamped by the clamps 22, and then a load is applied to the product under test by the loading element 23. The drive motor 24 is started to drive the product under test to rotate, thereby detecting its fatigue life under this load.

[0025] Furthermore, there are two loading elements 23, each connected to the product under test near one of the two clamps 22. Please refer to [link / reference]. Figure 4 The loading component 23 includes a hanging arm 231, a bearing 232, a support plate 233, and several weights 234. The inner ring of the bearing 232 is fitted onto the product to be tested, and the top end of the hanging arm 231 is fitted onto the outer ring of the bearing 232. Under the action of gravity, the hanging arm 231 extends vertically downward, thereby ensuring that the product to be tested can rotate smoothly when a load is applied to it. The support plate 233 is located at the bottom of the hanging arm 231, and its cross-sectional area is larger than that of the hanging arm 231. A slot is provided on the outer periphery of the weight 234. The slot extends radially along the weight 234, and the weight 234 is engaged with the hanging arm 231 and abuts against the support plate 233 through the slot, thereby completing the positioning of the weight 234. The base 1 is provided with a through-hole relief groove 16 at the position corresponding to the two loading components 23, which facilitates the adjustment of the weights 234 by adding or removing them through the relief groove 16.

[0026] Please see Figure 5The base 1 is provided with at least one pair of slide rails 17 extending parallel to the axis of the rotating shaft 21. The two slide rails 17 are located on both sides of the hanging arm 231. Limiting rods 18 are installed on the slide rails 17. The limiting rods 18 are located above the weight 234 and are inserted into the slide rails 17 at both ends. They are arranged perpendicular to the axis of the rotating shaft 21 and can slide along the extension direction of the slide rails 17. The limiting rods 18 are provided with limiting grooves 181 for the hanging arm 231 to be engaged. The limiting grooves 181 extend radially along the hanging arm 231. A fixing block 19 is fixedly installed at one end of the slide rail 17. When the limiting rod 18 slides to abut against the fixing block 19 and the limiting groove 181 engages with the hanging arm 231, the hanging arm 231 is in a vertical state. Therefore, before adding or removing the corresponding number of weights 234, the limiting rod 18 can be slid to abut against the fixing block 19, and the hanging arm 231 can be engaged in the limiting groove 181. Thus, after adding or removing the weights 234, the swing amplitude of the hanging arm 231 can be reduced, and it can quickly return to the vertical state.

[0027] like Figure 1-2 As shown, the protective cover 3 is positioned above the test body 2. Specifically, the protective cover 3 is installed between the pair of clamps 22, enclosing a portion of the rotating sample to be tested. The protective cover 3 has recesses 33 on its two sides near the clamps 22, extending away from the base 1 to form a clearance structure that conforms to the contour of the clamps 22. This configuration ensures that when the protective cover 3 is positioned above the product under test, its two sides can smoothly engage with the outside of the clamps 22 through the recesses 33. This avoids interference between the protective cover 3 and the test body 2, while ensuring a tightly fitted, enclosed protective space between the protective cover 3, the base 1, and the product under test, further improving the protective sealing and structural compatibility.

[0028] One side of the bottom of the protective cover 3 is hinged to the base 1, with its hinge axis parallel to the axis of the rotating shaft 21. The other side of the bottom is provided with at least one positioning protrusion 31. The base 1 has a positioning groove 11 for inserting the positioning protrusion 31. The base 1 is provided with a locking component 4 for locking the positioning protrusion 31. The locking component 4 can restrict the movement of the positioning protrusion 31 in the positioning groove 11, thereby locking it after the protective cover 3 is closed, so that the protective cover 3 is stably placed over the product under test, blocking the fragments that are ejected during the test and improving safety.

[0029] Furthermore, in this embodiment, there are two positioning protrusions 31, which are spaced apart along a direction parallel to the axis of the rotating shaft 21. Correspondingly, the base 1 is provided with two positioning grooves 11, which extend downward along a direction perpendicular to the top surface of the base 1. The width of the positioning groove 11 is greater than the thickness of the positioning protrusions 31, so that when the protective cover 3 is rotated, the positioning protrusions 31 can be smoothly inserted into the positioning grooves 11.

[0030] Projecting along the axis of the rotating shaft 21, the base 1 has a sliding groove 13 corresponding to the groove wall of each positioning groove 11, communicating with the interior of the positioning groove 11. The sliding groove 13 is perpendicular to the groove wall of the positioning groove 11 and extends in a direction away from the protective cover 3. Each sliding groove 13 is provided with a locking component 4. The locking component 4 includes a locking rod 42, a toggle block 44, and a first elastic element 46. The locking rod 42 is slidably installed in the sliding groove 13. A limiting hole 311 is opened on the side of the positioning protrusion 31 at the position corresponding to the locking rod 42. The extension direction of the limiting hole 311 is consistent with the extension direction of the sliding groove 13. The locking rod 42 passes through the limiting hole 311 to lock the positioning protrusion 31. The top of the base 1 and at the position corresponding to the sliding groove 13 have a toggle groove 14 communicating with the sliding groove 13. The toggle groove 14 extends along the... The sliding groove 13 extends along its length and is shorter than the length of the sliding groove 13. The actuating block 44 is slidably installed in the actuating groove 14. One end of the actuating block 44 is connected to the end of the locking rod 42 away from the limiting hole 311, and the other end protrudes out of the actuating groove 14. The first elastic element 46 is a spring. One end of the first elastic element 46 is fixed to the bottom of the sliding groove 13, and the other end is connected to the end of the locking rod 42 away from the limiting hole 311. When no external force is applied, the locking rod 42 is pushed into the limiting hole 311. By actuating the actuating block 44, the locking rod 42 is driven to slide in the sliding groove 13 until the locking rod 42 leaves the limiting hole 311, thereby releasing the lock on the positioning protrusion 31 and allowing the protective cover 3 to be opened.

[0031] Furthermore, a second elastic element 15 is provided at the bottom of the positioning groove 11. The second elastic element 15 is a spring, one end of which is fixedly installed at the bottom of the positioning groove 11. When the locking rod 42 is inserted into the limiting hole 311, the positioning protrusion 31 abuts against the second elastic element 15, and the second elastic element 15 is in a compressed state. Thus, when the actuating block 44 is moved, causing the locking rod 42 to leave the limiting hole 311, the second elastic element 15 recovers its elasticity due to the loss of the pressure of the locking rod 42, thereby popping the positioning protrusion 31 out of the positioning groove 11. This eliminates the need to press the actuating block 44 while pulling the positioning protrusion 31 out of the positioning groove 11, improving unlocking efficiency.

[0032] Furthermore, one end of the locking rod 42 is inserted into the limiting hole 311, and the side facing the opening of the positioning groove 11 is a guide surface 422. The guide surface 422 is an inclined surface or an arc-shaped curved surface, forming a large end and a small end on the locking rod 42, wherein the end closer to the positioning groove 11 is the small end, and the end farther away from the positioning groove 11 is the large end. The guide surface 422 plays a guiding role during the insertion and locking process of the positioning protrusion 31. When the protective cover 3 is rotated to close, the positioning protrusion 31 is inserted into the positioning groove 11. The bottom of the positioning protrusion 31 first contacts the guide surface 422 and slides smoothly under the guidance of the guide surface 422. As the insertion continues, the positioning protrusion 31 pushes the locking rod 42 to slide towards the first elastic member 46. At this time, the locking rod 42 and the side of the positioning protrusion 31 remain abutted, and the first elastic member 46 is compressed. When the positioning protrusion 31 is fully inserted into the positioning groove 11, the limiting hole 311 aligns with the locking rod 42. The first elastic member 46 resets and pushes the locking rod 42 into the limiting hole 311, thus completing the closing and locking of the protective cover 3. Through the guiding action of the guide surface 422 and the elastic cooperation of the first elastic member 166, after rotating to close the protective cover 3, only pressing down on the protective cover 3 is needed to achieve a continuous action of inserting and locking the positioning protrusion 31, effectively improving the locking efficiency of the protective cover 3.

[0033] Furthermore, a handle 32 is fixedly installed on the outer side wall of the protective cover 3 away from the hinge, making it easier to open the protective cover 3; several support rubber seats 12 are arranged at intervals along the circumference of the bottom of the base 1 to improve the overall stability.

[0034] The bending fatigue testing device of this application has the following testing procedure: First, the inner ring of the bearing 232 is precisely fitted and fixed to the outer circumference of the product to be tested. Then, the two ends of the product to be tested are firmly clamped and positioned by the clamp 22. Next, the sliding limit rod 18 is moved to abut the fixing block 19, so that the hanging arm 231 is engaged in the limit groove 181. Then, according to the test requirements, the weights 234 of the corresponding specifications and quantity are placed on the support plate 233 to complete the bending moment loading configuration. Finally, the protective cover 3 is rotated around the hinge axis so that the positioning protrusion 31 at the bottom of the protective cover 3 is precisely inserted into the positioning groove 11 of the base 1. The protective cover 3 is pressed until the locking rod 42 of the locking component 4 automatically passes through the limit hole 311 of the positioning protrusion 31, thus completing the rapid locking of the protective cover. The entire operation process is simple and efficient, with accurate positioning and reliable locking, effectively ensuring the safety of the testing process.

[0035] This utility model's bending fatigue testing device effectively blocks flying debris during testing by installing a protective cover above the testing body, preventing injury to personnel. The added locking component can achieve precise locking after the positioning protrusion is inserted into the positioning groove, ensuring that the protective cover will not be accidentally opened in a high-vibration testing environment, further enhancing the reliability of safety protection. The coordinated cooperation between the guide surface and the elastic element makes the locking and unlocking operation of the protective cover smoother and more convenient, and the switching can be completed without complicated steps, greatly improving the operating efficiency of the device. By opening a limiting groove on the limiting rod and engaging it with the hanging arm, the swing of the hanging arm can be quickly suppressed and it can be quickly restored to a vertical state after adjusting the loading parameters by adding or removing weights. This not only significantly enhances the stability of the equipment operation but also reduces the waiting time after parameter adjustment, directly improving the testing efficiency.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A bending fatigue testing device, characterized in that, include: Base; The test body is mounted on the base and includes a pair of clamps for holding the product to be tested and rotating along the same axis. A protective cover is provided above the test body and surrounds the outside of the fixture. One side of the bottom of the protective cover is hinged to the base, and its hinge axis is parallel to the rotation axis of the fixture. At least one positioning protrusion is provided on the other side. The base is provided with a positioning groove and a sliding groove; the positioning protrusion can be engaged in the positioning groove, and the sliding groove is in communication with the groove wall of the positioning groove; And a locking component, which slides within the sliding groove and is capable of locking the positioning protrusion.

2. The bending fatigue testing device according to claim 1, characterized in that: The locking assembly includes a locking rod and a toggle block. The locking rod is slidably disposed in the sliding groove. A limiting hole is formed at the position of the positioning protrusion corresponding to the locking rod. The locking rod passes through the limiting hole to lock the positioning protrusion. The top of the base is provided with a toggle groove that connects the sliding groove and the outside of the base. The toggle groove is arranged along the length direction of the sliding groove. The toggle block is slidably disposed in the toggle groove. One end of the toggle block is connected to one end of the locking rod, and the other end extends out of the toggle groove.

3. The bending fatigue testing device according to claim 2, characterized in that: The locking assembly further includes a first elastic element, one end of which abuts against the bottom of the sliding groove, and the other end of which abuts against the side of the locking rod away from the limiting hole; the bottom of the positioning groove is provided with a second elastic element; when the locking rod is inserted into the limiting hole, the positioning protrusion presses down on the second elastic element.

4. The bending fatigue testing device according to claim 3, characterized in that: The locking rod is inserted into one end of the limiting hole, and a guide surface is provided facing the opening of the positioning groove. The guide surface is an inclined surface or an arc-shaped curved surface.

5. The bending fatigue testing device according to claim 1, characterized in that: A handle is installed on the outer side wall of the protective cover away from the hinge.

6. The bending fatigue testing device according to claim 1, characterized in that: The test body also includes a pair of rotating shafts, a loading element, a drive motor, and a pair of brackets. The two brackets are arranged opposite each other on the base and extend upward. The two rotating shafts are respectively and rotatably mounted on the brackets at intervals, and the axes of the two rotating shafts are coaxial. The two clamps are respectively mounted on the ends of the two rotating shafts that are close to each other. The drive motor is fixedly mounted on the base, and the output shaft of the drive motor is driven to the end of one of the rotating shafts away from the clamp. The loading element is used to apply a load to the product under test.

7. A bending fatigue testing device according to claim 6, characterized in that: The loading component consists of two parts, each connected to the product under test near the two clamps. Each part includes a hanging arm, a bearing, a support plate, and several weights. The inner ring of the bearing is fitted onto the product under test. The top end of the hanging arm is connected to the outer ring of the bearing. The hanging arm extends toward the base. The support plate is located at the bottom of the hanging arm. The weights are engaged with the hanging arm and abut against the support plate. The base has a clearance groove for the loading component to pass through.

8. A bending fatigue testing device according to claim 7, characterized in that: The base is provided with at least one pair of slide rails extending parallel to the axis of the rotating shaft, and the two slide rails are located on both sides of the hanging arm; the slide rails are provided with limiting rods, the two ends of the limiting rods are respectively inserted into the two slide rails and perpendicular to the axis of the rotating shaft, the limiting rods can slide along the extension direction of the slide rails, and are provided with limiting grooves for the hanging arm to be engaged.

9. A bending fatigue testing device according to claim 8, characterized in that: At least one end of the slide rail is provided with a fixing block. When the hanging arm is engaged in the limiting groove, the limiting rod abuts against the fixing block, so that the hanging arm is in a vertical state.

10. A bending fatigue testing device according to claim 1, characterized in that: The bottom of the base is provided with several support rubber seats at circumferential intervals.

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