A stop mechanism for spring fatigue detection
Patent Information
- Application Number
- CN202521740140.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-08-15
AI Technical Summary
[0002]弹簧作为汽车、机械等领域的核心基础部件，其性能直接关系到设备的运行稳定性与安全性，在汽车悬挂系统、发动机气门机构等关键部位，弹簧需长期承受交变载荷，极易因疲劳失效引发机械故障，甚至造成安全事故，因此，对弹簧进行疲劳度检测是确保其质量合格的关键环节，通过模拟弹簧实际工作中的受力状态，测试其在反复拉伸、压缩作用下的使用寿命与性能衰减规律，是保障设备可靠运行的重要前提，现有技术中，弹簧疲劳度检测设备通常通过驱动机构带动弹簧进行往复伸缩运动，同时借助限位机构控制弹簧的最大形变行程，以模拟其实际工作时的极限受力状态，其工作过程大致为：将待检测弹簧固定于检测台上，驱动装置通过连杆、凸轮等传动部件带动弹簧一端做周期性往复运动，使弹簧不断被拉伸或压缩；限位机构则通过挡块、限位杆等部件，在弹簧达到预设形变极限时对其运动进行阻挡，避免弹簧因过度形变而提前损坏，从而在可控条件下完成疲劳寿命测试，然而，现有限位机构存在一些问题，多数机构仅通过单一限位部件实现行程控制，若该部件出现松动或磨损，易引发行程失控，影响检测结果的准确性，为此，我们提出一种弹簧疲劳度检测用限位机构
与现有技术相比，本实用新型的有益效果是：本弹簧疲劳度检测用限位机构，具有以下好处：
Smart Images
Figure CN224839380U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts technology, specifically a limiting mechanism for spring fatigue testing. Background Technology
[0002] As a core component in the automotive and mechanical industries, springs directly affect the operational stability and safety of equipment. In critical components such as automotive suspension systems and engine valve mechanisms, springs must withstand alternating loads for extended periods, making them highly susceptible to fatigue failure, which can lead to mechanical malfunctions and even safety accidents. Therefore, fatigue testing of springs is a crucial step in ensuring their quality. By simulating the stress state of springs in actual operation, testing their service life and performance degradation under repeated stretching and compression is an important prerequisite for ensuring reliable equipment operation. In existing technologies, spring fatigue testing equipment typically uses a drive mechanism to move the spring in a reciprocating stretching motion, while simultaneously using a limiting mechanism to control the maximum deformation stroke of the spring. Simulating the ultimate stress state during actual operation, the working process is roughly as follows: the spring to be tested is fixed on the testing platform, and the driving device drives one end of the spring to make periodic reciprocating motion through transmission components such as connecting rods and cams, so that the spring is continuously stretched or compressed; the limiting mechanism, through components such as stops and limiting rods, blocks the movement of the spring when it reaches the preset deformation limit, preventing the spring from being damaged prematurely due to excessive deformation, thus completing the fatigue life test under controllable conditions. However, existing limiting mechanisms have some problems. Most mechanisms only use a single limiting component to achieve stroke control. If this component becomes loose or wears out, it is easy to cause stroke loss of control, affecting the accuracy of the test results. Therefore, we propose a limiting mechanism for spring fatigue testing. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a limiting mechanism for spring fatigue detection. By limiting twice, the limiting accuracy and reliability of spring fatigue detection are effectively improved, which can effectively solve the problems in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a limiting mechanism for spring fatigue testing, comprising an adjusting frame and a mounting base; Adjustment frame: A slider is slidably connected in the middle of the slider, a pin is fixedly connected to the front side of the slider, a connecting rod is rotatably connected to the outer arc surface of the pin, a rotating shaft is fixedly connected to the upper end of the connecting rod, a first tightening screw is threaded to the right end of the slider, and the left end of the first tightening screw contacts the left side of the adjustment frame. Mounting base: Both ends of the upper and lower inner walls are provided with sliding rods, and a sliding seat is slidably connected between the outer arc surfaces of the two sliding rods. Threaded holes are opened on the bottom wall of the mounting base and the lower side of the sliding seat. The rear side of the sliding seat is fixedly connected to the front side of the rotating shaft. A limit plate is slidably connected between the outer arc surfaces of the two sliding rods. The limit plate and the sliding seat are used in conjunction to effectively improve the accuracy and reliability of the limit for spring fatigue detection through two limit operations.
[0005] Furthermore, the right end of the front side of the adjustment frame is provided with a scale line, and the upper side of the slider is used in conjunction with the scale line. The slider and the scale line are referenced to determine the movement distance of the slider.
[0006] Furthermore, a laser rangefinder is installed on the top wall of the mounting base. The laser rangefinder is bidirectionally electrically connected to an external microcontroller. The laser rangefinder is configured in conjunction with the limiting plate to detect the distance the limiting plate moves.
[0007] Furthermore, the upper side of the limiting plate is fixedly connected with symmetrically distributed limiting cylinders. Each limiting cylinder is sleeved on the outer arc surface of the adjacent slide rod. The front end of the cylinder wall of each limiting cylinder is threaded with a second tightening screw. The rear end of each second tightening screw contacts the front end of the outer arc surface of the adjacent slide rod on the rear side to lock the position of the limiting plate.
[0008] Furthermore, a rubber block is fixedly connected to the lower side of the limiting plate, and the lower side of the rubber block contacts the upper side of the sliding seat to reduce impact.
[0009] Furthermore, a drive hole is provided at the lower end of the adjustment frame, and a keyway is provided at the upper end of the inner arc surface of the drive hole to drive the adjustment frame to rotate.
[0010] Furthermore, mounting plates are provided on both the left and right sides of the lower end of the mounting base to facilitate installation. Compared with the prior art, the beneficial effects of this utility model are as follows: This limiting mechanism for spring fatigue detection has the following advantages: By adjusting the scale lines on the slider of the adjustment frame, the maximum upward stroke of the spring tension component in the sliding seat can be precisely controlled according to the circumferential radius of the slider, realizing the first precise limit for spring fatigue detection and meeting the detection stroke requirements of different springs. The limit plate and the sliding seat work together, and the laser rangefinder can accurately locate the position of the limit plate to form a secondary limit. Through two limits, the accuracy and reliability of the limit for spring fatigue detection can be effectively improved. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial structural schematic diagram of the adjustment frame of this utility model; Figure 3This is a partial structural schematic diagram of the mounting base of this utility model.
[0012] In the diagram: 1 Adjustment frame, 2 Slider, 3 Pin, 4 Connecting rod, 5 Rotating shaft, 6 Scale line, 7 First tightening screw, 8 Mounting seat, 9 Slide rod, 10 Sliding seat, 11 Limiting plate, 12 Rubber block, 13 Limiting cylinder, 14 Second tightening screw, 15 Laser rangefinder, 16 Drive hole, 17 Keyway, 18 Mounting plate. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] Please see Figure 1-3 This embodiment provides a technical solution: a limiting mechanism for spring fatigue detection, including an adjusting frame 1 and a mounting base 8; Adjustment frame 1: A slider 2 is slidably connected to the middle of the frame. A scale line 6 is provided on the right end of the front side of the adjustment frame 1. The upper side of the slider 2 is used in conjunction with the scale line 6. A pin 3 is fixedly connected to the front side of the slider 2. A connecting rod 4 is rotatably connected to the outer arc surface of the pin 3. A rotating shaft 5 is fixedly connected to the upper end of the connecting rod 4. A first tightening screw 7 is threadedly connected to the right end of the slider 2. The left end of the first tightening screw 7 contacts the left side of the adjustment frame 1. A drive hole 16 is provided at the lower end of the adjustment frame 1. A keyway 17 is provided at the upper end of the inner arc surface of the drive hole 16. Mounting plates 18 are provided on both the left and right sides of the lower end of the mounting base 8. The output shaft of the external drive motor is connected to the drive hole 16 and the adjustment frame 18 through the cooperation of the flat key and the keyway 17. The frame 1 forms a rigid connection. When the motor starts, it drives the adjusting frame 1 to perform a circular motion. At this time, the slider 2 rotates synchronously with the adjusting frame 1. It drives the connecting rod 4 through the pin 3 to produce a pushing and pulling action, which in turn drives the sliding seat 10 to move up and down along the sliding rod 9 through the rotating shaft 5. Before this, the operator can loosen the first tightening screw 7 and slide to adjust the position of the slider 2 on the adjusting frame 1. When the slider 2 is farther away from the center axis of the drive hole 16, the radius of the circular motion of the slider 2 is larger, and the pushing and pulling amplitude of the connecting rod 4 increases accordingly, ultimately increasing the maximum upward sliding stroke of the sliding seat 10. Conversely, when the slider 2 is closer to the center of the drive hole 16, the maximum upward stroke of the sliding seat 10 decreases. With the help of the scale line 6 on the adjustment frame 1, the stroke of the sliding seat 10 can be precisely controlled. The adjustment logic is as follows: the core relationship between the maximum upward stroke S of the sliding seat 10 and the circumferential radius r of the slider 2 is: S≈2r*sinθ, where S is the maximum upward stroke of the sliding seat 10, that is, the distance from the lowest point to the highest point during the up-and-down reciprocating motion; r is the distance from the center axis of the pin 3 to the center axis of the drive hole 16, which is the circumferential radius of the center axis of the pin 3, which can be read through the scale line 6 (because the distance between the center axis of the pin 3 and the upper side of the slider 2 is constant, the moving distance of the slider 2 = the moving distance of the center axis of the pin 3); θ is the maximum vertical distance between the connecting rod 4 and the vertical direction. The swing angle (approximately fixed after assembly, determined by the length and installation position of the connecting rod 4) is determined by the following: When the adjusting frame 1 drives the slider 2 to make circular motion, the movement trajectory of the pin 3 is a circle with radius r. Its maximum vertical displacement (the difference between the highest and lowest points) is 2r*sinθ. This displacement is directly transmitted to the sliding seat 10 through the connecting rod 4 and converted into the maximum upward stroke S of the sliding seat 10. Therefore, as r increases (the central axis of the pin 3 moves away from the center of the drive hole 16), S also increases; as r decreases (the central axis of the pin 3 moves closer to the center of the drive hole 16), S also decreases. With the precise adjustment of r by the scale line 6, quantitative control of S can be achieved, and the first limit for spring fatigue detection can be set. Mounting base 8: Slide rods 9 are provided at both ends of the upper and lower inner walls. A sliding seat 10 is slidably connected between the outer arc surfaces of the two slide rods 9. Threaded holes are provided on the bottom wall of the mounting base 8 and the lower side of the sliding seat 10. The rear side of the sliding seat 10 is fixedly connected to the front side of the rotating shaft 5. A limiting plate 11 is slidably connected between the outer arc surfaces of the two slide rods 9. The limiting plate 11 cooperates with the sliding seat 10. A laser rangefinder 15 is mounted on the top wall of the mounting base 8. The laser rangefinder 15 is bidirectionally electrically connected to an external microcontroller. The laser rangefinder 15 and the limiting plate 11... In conjunction with the design, symmetrically distributed limiting cylinders 13 are fixedly connected to the upper side of the limiting plate 11. Each limiting cylinder 13 is fitted onto the outer arc surface of an adjacent slide rod 9. A second tightening screw 14 is threaded to the front end of each limiting cylinder 13's wall. The rear end of each second tightening screw 14 contacts the front end of the outer arc surface of the adjacent slide rod 9. A rubber block 12 is fixedly connected to the lower side of the limiting plate 11. The lower side of the rubber block 12 contacts the upper side of the sliding seat 10. The position H of the limiting plate 11 serves as the second limiting point for the sliding seat 10. The position of the limiting plate 11 needs to be determined according to… The maximum upward stroke of the sliding seat 10 is calculated as follows: the limiting plate 11 and the rubber block 12 are integrated, the distance between the lower side of the rubber block 12 and the upper side of the limiting plate 11 is constant at X, the maximum upward stroke of the sliding seat 10 is ΔSmax, and the distance between the top and bottom walls of the mounting base 8 is constant at Y. Therefore, the position of the limiting plate 11, H = YX - ΔSmax, is the position that the limiting plate 11 needs to be adjusted to. Loosen the second tightening screw 14, and turn on the laser rangefinder 15 through the external microcontroller. The emitting end of the laser rangefinder 15 is aligned with the top wall of the mounting base 8. A flat surface is then slid upwards by the worker sliding the limiting plate 11. During this process, the laser emitted by the laser rangefinder 15 always illuminates the upper side of the limiting plate 11. When the distance displayed is H, tightening the second tightening screw 14 can fix its height position, thereby forming a secondary limit on the upper limit position of the sliding seat 10. When the sliding seat 10 moves upwards to contact the rubber block 12 at the bottom of the limiting plate 11, it will be rigidly blocked and stop moving upwards. During this process, the rubber block 12 can buffer the impact force, reduce component wear, and perform secondary limit detection of spring fatigue.
[0015] The working principle of the limiting mechanism for spring fatigue testing provided by this utility model is as follows: The mounting base 8 is installed on the worktable of the spring fatigue testing equipment through the mounting plate 18 at its lower end (the external bolts are inserted into the mounting holes of the mounting plate 18 and connected to the internal threaded holes of the worktable). The spring connecting parts are installed on the bottom wall of the mounting base 8 and the lower side of the sliding seat 10 respectively through the cooperation of the bolts and the threaded holes. Then, the spring to be fatigue tested is connected between the two connecting parts. Then, the output shaft of the external drive motor is connected to the drive hole 16 through the cooperation of the flat key and the keyway 17. The adjusting frame 1 forms a rigid connection. When the motor starts, it will drive the adjusting frame 1 to make a circular motion. At this time, the slider 2 rotates synchronously with the adjusting frame 1. It drives the connecting rod 4 to produce a push-pull action through the pin 3, and then drives the sliding seat 10 to make up-down reciprocating motion along the sliding rod 9 through the rotating shaft 5. Before this, the operator can loosen the first tightening screw 7 and slide to adjust the position of the slider 2 on the adjusting frame 1. When the slider 2 is farther away from the center axis of the drive hole 16, the radius of the circular motion of the slider 2 is larger, and the pushing and pulling amplitude of the connecting rod 4 increases accordingly, which ultimately increases the maximum stroke of the sliding seat 10 sliding upward.Conversely, when slider 2 approaches the center of drive hole 16, the maximum upward stroke of slider 10 decreases. Combined with the scale line 6 on adjustment bracket 1, precise control of the stroke of slider 10 can be achieved. The adjustment logic is as follows: the core relationship between the maximum upward stroke S of slider 10 and the circumferential radius r of slider 2 is: S≈2r*sinθ, where S is the maximum upward stroke of slider 10, i.e., the distance from the lowest point to the highest point during reciprocating motion, and r is the distance from the central axis of pin 3 to the central axis of drive hole 16, which is the circumferential radius of the central axis of pin 3, which can be read through scale line 6 (because the distance between the central axis of pin 3 and the upper side of slider 2 is constant). Since the distance the slider 2 moves is equal to the distance the central axis of the pin 3 moves, θ is the maximum swing angle of the connecting rod 4 in the vertical direction (approximately a fixed value after assembly, determined by the length and installation position of the connecting rod 4). When the adjusting frame 1 drives the slider 2 to make circular motion, the trajectory of the pin 3 is a circle with radius r. Its maximum vertical displacement (the difference between the highest and lowest points) is 2r*sinθ. This displacement is directly transmitted to the sliding seat 10 through the connecting rod 4, and is converted into the maximum upward stroke S of the sliding seat 10. Therefore, as r increases (the central axis of the pin 3 moves away from the center of the drive hole 16), S also increases; as r decreases (the central axis of the pin 3 moves closer to the center of the drive hole 16), S also increases. S also decreases. Combined with the precise adjustment of r by the scale line 6, quantitative control of S can be achieved. This is the first limit, thus meeting the stroke requirements of different spring fatigue detection. The position H of the limit plate 11 is the second limit of the sliding seat 10. The position of the limit plate 11 needs to be calculated based on the maximum upward stroke of the sliding seat 10. The limit plate 11 and the rubber block 12 are a single unit. The distance between the lower side of the rubber block 12 and the upper side of the limit plate 11 is constant at X. The maximum upward stroke of the sliding seat 10 is ΔSmax. The distance between the top and bottom walls of the mounting base 8 is constant at Y. Therefore, the position H of the limit plate 11 = YX - ΔSmax is the position that the limit plate 11 needs to be adjusted to. Loosen the second tightening screw 14, and activate the laser rangefinder 15 via an external microcontroller. The emitting end of the laser rangefinder 15 is flush with the top wall of the mounting base 8. Then, the worker slides the limiting plate 11 upwards. During this process, the laser emitted by the laser rangefinder 15 continuously illuminates the upper side of the limiting plate 11. When the distance displayed is H, tightening the second tightening screw 14 fixes its height position, thus creating a secondary limit on the upward limit position of the sliding seat 10. When the sliding seat 10 moves upwards to contact the rubber block 12 at the bottom of the limiting plate 11, it will be rigidly blocked and stop moving upwards. The rubber block 12 buffers the impact force during this process, reducing component wear.
[0016] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A limiting mechanism for spring fatigue testing, characterized in that: Includes an adjustment bracket (1) and a mounting base (8); Adjustment frame (1): A slider (2) is slidably connected in the middle. A pin (3) is fixedly connected to the front side of the slider (2). A connecting rod (4) is rotatably connected to the outer arc surface of the pin (3). A rotating shaft (5) is fixedly connected to the upper end of the connecting rod (4). A first tightening screw (7) is threadedly connected to the right end of the slider (2). The left end of the first tightening screw (7) is in contact with the left side of the adjustment frame (1). Mounting base (8): Both the left and right ends of the upper and lower inner walls are provided with sliding rods (9), and a sliding seat (10) is slidably connected between the outer arc surfaces of the two sliding rods (9). Threaded holes are provided on the bottom wall of the mounting base (8) and the lower side of the sliding seat (10). The rear side of the sliding seat (10) is fixedly connected to the front side of the rotating shaft (5). A limiting plate (11) is slidably connected between the outer arc surfaces of the two sliding rods (9). The limiting plate (11) is used in conjunction with the sliding seat (10).
2. The limiting mechanism for spring fatigue testing according to claim 1, characterized in that: The right side of the front side of the adjustment frame (1) is provided with a scale line (6), and the upper side of the slider (2) is used in conjunction with the scale line (6).
3. The limiting mechanism for spring fatigue testing according to claim 1, characterized in that: A laser rangefinder (15) is installed on the top wall of the mounting base (8). The laser rangefinder (15) is bidirectionally electrically connected to an external microcontroller. The laser rangefinder (15) is set in conjunction with the limiting plate (11).
4. The limiting mechanism for spring fatigue testing according to claim 1, characterized in that: The upper side of the limiting plate (11) is fixedly connected with symmetrically distributed limiting cylinders (13). The limiting cylinders (13) are all sleeved on the outer arc surface of the adjacent slide rod (9). The front end of the cylinder wall of the limiting cylinder (13) is threaded with a second tightening screw (14). The rear end of the second tightening screw (14) is in contact with the front side of the outer arc surface of the adjacent slide rod (9).
5. A limiting mechanism for spring fatigue testing according to claim 1, characterized in that: A rubber block (12) is fixedly connected to the lower side of the limiting plate (11), and the lower side of the rubber block (12) contacts the upper side of the sliding seat (10).
6. The limiting mechanism for spring fatigue testing according to claim 1, characterized in that: The lower end of the adjustment frame (1) is provided with a drive hole (16), and the upper end of the inner arc surface of the drive hole (16) is provided with a keyway (17).
7. A limiting mechanism for spring fatigue testing according to claim 1, characterized in that: Mounting plates (18) are provided on both the left and right sides of the lower end of the mounting base (8).