Spring fatigue test mechanism

Abstract

The utility model belongs to the technical field of spring performance test, and particularly relates to a spring fatigue test mechanism, which comprises a loading assembly capable of enabling the mechanism to operate stably, and a driving assembly capable of applying periodic stress to a tested spring is arranged in the loading assembly. And a test assembly capable of flexibly adjusting the stretching degree of the tested spring according to the specification of the tested spring and the test requirement is arranged in front of the driving assembly. According to the utility model, the rotating shaft which drives the rotating wheel to rotate is installed on the liftable lifting frame, and the distance between the transmission rod and the rotating shaft is adjustable, so that the height of the transmission block in the swing piece which accommodates the tested spring can be adjusted according to the length of the tested spring; and the swinging amplitude of the transmission block in the swinging piece can be adjusted according to test requirements, so that the device can test springs of various specifications, and the stretching amplitude of the spring can meet the test requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of spring performance testing, in particular to a spring fatigue testing mechanism. Background Art

[0002] As an essential component of mechanical systems, springs can break or deform for various reasons, leading to failure. Therefore, after spring production, it is often necessary to sample and subject the springs to cyclical stress testing in a laboratory environment to verify their fatigue strength and ensure they meet production requirements.

[0003] A Chinese patent document with authorization publication number CN220729599U discloses a spring fatigue testing mechanism. After the two ends of the tested spring are respectively embedded between two externally threaded sleeves on the same side, a drive motor is started to cause a cam to reciprocate and drive a movable table and a movable frame to perform fatigue testing on the spring between the two externally threaded sleeves.

[0004] However, in the prior art, the degree of expansion and contraction of the spring is limited by the cam specifications and its own length. When conducting a spring fatigue test, it is inconvenient to adjust the compression and expansion degrees of the tested spring as needed. Therefore, a spring fatigue test mechanism is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a spring fatigue testing mechanism.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] A spring fatigue testing mechanism includes a loading assembly that enables the mechanism to operate stably, a driving assembly that applies periodic stress to a spring under test, and a testing assembly that is arranged in front of the driving assembly and can flexibly adjust the degree of expansion and contraction of the spring under test according to the specifications of the spring under test and test requirements;

[0008] The driving assembly includes a lifting frame, a shaft seat is fixedly connected to the lifting frame, and a rotating shaft is movably installed between the shaft seats;

[0009] The test assembly includes a rotating part that can adjust the expansion and contraction degree of the tested spring, a swinging part that can prevent the spring from tilting or deflecting during the test, and a detection part that can measure the force of the tested spring in real time;

[0010] The rotating member includes a rotating wheel fixedly connected to the outer side of the rotating shaft, a slider movably connected to the rotating wheel, and a transmission rod fixedly connected to the front of the slider;

[0011] The detection component comprises a transmission block movably connected to the outer side surface of the transmission rod.

[0012] Preferably: the rotating member further comprises an end seat fixedly mounted in the rotating wheel, a lead screw is provided between the slider and the two end seats, one end of the lead screw is fixedly connected to a knob, and the front end of the rotating shaft is fixedly connected to an anti-drop cap.

[0013] Preferably, the swinging member includes a fixing seat fixedly connected to the loading assembly, a support movably connected to the fixing seat, an accommodating cylinder fixedly connected above the support, and a top cover fixedly connected to the upper end of the accommodating cylinder.

[0014] Preferably, the detection component further comprises a tension and compression sensor fixedly installed in the accommodating cylinder, a transmission block is provided below the top cover, and a fixing cylinder is fixedly connected above the tension and compression sensor and below the transmission block.

[0015] Preferably, the shaft seat is rotatably connected to the rotating shaft.

[0016] Preferably, the rotating wheel is slidably connected to the slider, the end seat is rotationally connected to the lead screw, and the transmission rod and the lead screw are both connected to the slider through threads.

[0017] Preferably, the fixing seat is rotatably connected to the support, and the transmission rod and the accommodating cylinder are both slidably connected to the transmission block.

[0018] Preferably, a spiral groove is integrally formed in the fixing cylinder.

[0019] The beneficial effects of the present invention are as follows: by facilitating the installation of a rotating shaft for driving the rotating wheel on a liftable lifting frame and making the distance between the transmission rod and the rotating shaft adjustable, the height of the transmission block in the swinging member accommodating the tested spring can be adjusted according to the length of the tested spring, and the swing amplitude of the transmission block in the swinging member can be adjusted according to test requirements, thereby enabling the device to test springs of various specifications and ensuring that the expansion and contraction amplitude of the springs can meet test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a structural diagram of a spring fatigue testing mechanism described in the present utility model;

[0022] Figure 2 This is a schematic diagram of the main structure of a spring fatigue testing mechanism described in the present utility model;

[0023] Figure 3 This is a left-side structural schematic diagram of a spring fatigue testing mechanism described in the present utility model;

[0024] Figure 4 yes Figure 1A schematic diagram of the structure of some parts of the same scale;

[0025] Figure 5 yes Figure 1 A schematic diagram of the structure of some parts of the device is enlarged in proportion.

[0026] The following are the descriptions of the reference numerals:

[0027] 1. Loading assembly; 101. Frame; 102. Cover; 2. Driving assembly; 201. Electric push rod; 202. Lifting frame; 203. Shaft seat; 204. Rotating shaft; 205. First pulley; 206. Motor; 207. Second pulley; 208. Belt; 3. Test assembly; 301. Rotating wheel; 302. Slider; 303. Transmission rod; 304. End seat; 305. Lead screw; 306. Knob; 307. Anti-drop cap; 308. Fixed seat; 309. Support; 310. Accommodating cylinder; 311. Top cover; 312. Tension and compression sensor; 313. Transmission block; 314. Fixed cylinder. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0030] The present invention will be further described below through embodiments in conjunction with the accompanying drawings.

[0031] like Figure 1-Figure 5As shown, a spring fatigue testing mechanism includes a loading assembly 1 that can ensure stable operation of the mechanism. A driving assembly 2 is provided in the loading assembly 1 and can apply periodic stress to the spring under test. A testing assembly 3 is provided in front of the driving assembly 2 and can flexibly adjust the degree of expansion and contraction of the spring during testing according to the specifications of the spring under test and test requirements.

[0032] In this embodiment: the loading assembly 1 includes a frame 101, and a cover plate 102 is fixedly connected to the top of the frame 101; the frame 101 provides an installation position for components such as the electric push rod 201, the lifting frame 202, and the fixing seat 308, and the cover plate 102 prevents the lifting frame 202 from rising excessively and falling off the frame 101.

[0033] In this embodiment: the drive assembly 2 includes an electric push rod 201 fixedly installed on both sides of the frame 101, a lifting frame 202 is fixedly connected between the telescopic ends of the electric push rod 201, a shaft seat 203 is fixedly connected to the lifting frame 202, a rotating shaft 204 is movably installed between the shaft seats 203, a first pulley 205 is fixedly connected to the rear end of the rotating shaft 204, a motor 206 is fixedly installed below the lifting frame 202, a second pulley 207 is fixedly connected to the output end of the motor 206, and a belt 208 is provided between the first pulley 205 and the second pulley 207;

[0034] The frame 101 is slidably connected to the lifting frame 202, and the shaft seat 203 is rotatably connected to the rotating shaft 204;

[0035] The height of the lifting frame 202 in the frame 101 is adjusted by the electric push rod 201, and the rotating shaft 204 is installed above the lifting frame 202 through the shaft seat 203. The rotation of the output end of the motor 206 is transmitted to the rotating shaft 204 through the second pulley 207, the belt 208, and the first pulley 205, so that the rotating shaft 204 can continue to rotate relative to the shaft seat 203 after the motor 206 is working.

[0036] In this embodiment: the test assembly 3 includes a rotating part that can adjust the expansion and contraction degree of the tested spring, a swinging part that can avoid skewing and offsetting during the spring test, and a detection part that can measure the force condition of the tested spring in real time. The rotating part includes a rotating wheel 301 fixedly connected to the outer side of the rotating shaft 204, a slider 302 is movably connected to the rotating wheel 301, and a transmission rod 303 is fixedly connected to the front of the slider 302. The detection part includes a transmission block 313 movably connected to the outer side of the transmission rod 303. The rotating part also includes an end seat 304 fixedly installed in the rotating wheel 301, and a wire is set between the slider 302 and the two end seats 304. Lever 305, one end of the lead screw 305 is fixedly connected to a knob 306, the front end of the rotating shaft 204 is fixedly connected to an anti-dropping cap 307, the swinging member includes a fixed seat 308 fixedly connected to the loading assembly 1, the fixed seat 308 is movably connected to a support 309, an accommodating cylinder 310 is fixedly connected above the support 309, and a top cover 311 is fixedly connected to the upper end of the accommodating cylinder 310. The detection member also includes a tension and compression sensor 312 fixedly installed in the accommodating cylinder 310, a transmission block 313 is provided below the top cover 311, and a fixed cylinder 314 is fixedly connected above the tension and compression sensor 312 and below the transmission block 313;

[0037] The rotating wheel 301 is slidably connected to the slider 302, the end seat 304 is rotatably connected to the lead screw 305, the transmission rod 303 and the lead screw 305 are both connected to the slider 302 by threads, the fixed seat 308 is rotatably connected to the support 309, the transmission rod 303 and the accommodating cylinder 310 are both slidably connected to the transmission block 313, and a spiral groove is integrally formed in the fixed cylinder 314;

[0038] The screw 305 is installed on the rotating wheel 301 through the end seat 304, and the screw 305 is easily rotated by the knob 306. The rotating wheel 301 and the screw 305 jointly limit the movable range of the slider 302. The rotated screw 305 adjusts the distance between the slider 302 and the rotating shaft 204, thereby changing the distance between the transmission rod 303 connected to the slider 302 and the rotating shaft 204. Synchronously, the height of the transmission block 313 in the accommodating tube 310 will change with the movement of the transmission rod 303. The anti-drop cap 307 prevents the rotating wheel 301 from accidentally falling off the rotating shaft 204. The accommodating tube 310 is installed through the support 309 whose movable range is limited by the fixed seat 308. The tension and compression sensor 312 and the transmission block 313 are installed through the accommodating tube 310. The upper end opening of the accommodating tube 310 is closed by the top cover 311, and the overall strength of the accommodating tube 310 is improved. One end of the tested spring is connected through the fixed tube 314.

[0039] Working Principle: When this mechanism is installed and used for spring fatigue testing, the fixed cylinder 314 that matches the spring under test is selected, and the tension and compression sensor 312 is connected to an external signal processing device. Then, according to the length of the spring under test and the required degree of expansion and contraction, the height of the lifting frame 202 is adjusted by the electric push rod 201, and the distance between the transmission rod 303 and the rotating shaft 204 is adjusted by rotating the screw 305 with the knob 306. This ensures that the distance between the two fixed cylinders 314 meets the required length of the spring, and the rotation radius of the transmission rod 303 meets the required expansion and contraction length of the spring.

[0040] After the adjustment is completed, remove the top cover 311 relative to the accommodating tube 310, remove the transmission rod 303 relative to the slider 302, and then remove the transmission block 313 from the accommodating tube 310. Then, place the spring under test and the accommodating tube 310 into the accommodating tube 310 in sequence. After rotating the two ends of the spring into the two fixing tubes 314 to a certain depth, thus completing the fixing of the spring under test, reinstall the transmission rod 303 and the top cover 311 in sequence.

[0041] After the above work is completed, the motor 206 can be operated to drive the rotating shaft 204 to rotate. When the rotation of the rotating shaft 204 is transmitted to the transmission block 313 through the rotating wheel 301, the slider 302, and the transmission rod 303, the transmission block 313 will drive the accommodating cylinder 310 to swing and apply periodic stress to the spring under test. The force condition of the spring will be transmitted to the external signal processing equipment in real time through the tension and compression sensor 312, so that the force condition of the spring can be observed in real time through the signal processing equipment. When the spring reaches fatigue strength, the measured force condition will change.

[0042] The preferred embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A spring fatigue testing mechanism, characterized in that: The invention comprises a loading assembly (1) capable of enabling the mechanism to operate stably, a driving assembly (2) capable of applying periodic stress to a spring under test is provided in the loading assembly (1), and a testing assembly (3) capable of flexibly adjusting the degree of expansion and contraction of the spring under test according to the specifications of the spring under test and test requirements is provided in front of the driving assembly (2); The driving assembly (2) comprises a lifting frame (202), a shaft seat (203) is fixedly connected to the lifting frame (202), and a rotating shaft (204) is movably installed between the shaft seats (203); The test assembly (3) includes a rotating part that can adjust the expansion and contraction degree of the tested spring, a swinging part that can prevent the spring from tilting or deflecting during the test, and a detection part that can measure the stress condition of the tested spring in real time; The rotating member comprises a rotating wheel (301) fixedly connected to the outer side of the rotating shaft (204); a slider (302) is movably connected to the rotating wheel (301); and a transmission rod (303) is fixedly connected to the front of the slider (302); The detection member comprises a transmission block (313) movably connected to the outer side of the transmission rod (303).

2. A spring fatigue testing mechanism according to claim 1, characterized in that: The rotating member further comprises an end seat (304) fixedly mounted in the rotating wheel (301); a lead screw (305) is provided between the slider (302) and the two end seats (304); one end of the lead screw (305) is fixedly connected to a knob (306); and a front end of the rotating shaft (204) is fixedly connected to an anti-drop cap (307).

3. A spring fatigue testing mechanism according to claim 2, characterized in that: The swinging member comprises a fixed seat (308) fixedly connected to the loading assembly (1); a support (309) is movably connected to the fixed seat (308); a receiving tube (310) is fixedly connected above the support (309); and a top cover (311) is fixedly connected to the upper end of the receiving tube (310).

4. A spring fatigue testing mechanism according to claim 3, characterized in that: The detection component further comprises a tension and compression sensor (312) fixedly mounted in the accommodating cylinder (310); the transmission block (313) is provided below the top cover (311); and a fixing cylinder (314) is fixedly connected above the tension and compression sensor (312) and below the transmission block (313).

5. A spring fatigue testing mechanism according to claim 1, characterized in that: The shaft seat (203) is rotatably connected to the rotating shaft (204).

6. A spring fatigue testing mechanism according to claim 2, characterized in that: The rotating wheel (301) is slidably connected to the slider (302), the end seat (304) is rotationally connected to the lead screw (305), and the transmission rod (303) and the lead screw (305) are both connected to the slider (302) through threads.

7. A spring fatigue testing mechanism according to claim 4, characterized in that: The fixing seat (308) is rotatably connected to the support (309), and the transmission rod (303) and the accommodating cylinder (310) are both slidably connected to the transmission block (313).

8. A spring fatigue testing mechanism according to claim 4, characterized in that: A spiral groove is integrally formed in the fixing cylinder (314).

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