Ski cycle load test device and test method

Abstract

A kind of ski cyclic loading test device and test method, belong to ski performance test field.The present application is aimed at the problems that existing ski cannot carry out fatigue life test under the condition of load control, and is not conducive to product quality control.The device comprises: test piece support structure for placing ski test piece;The center position of ski test piece is fixed between upper pressing plate and lower pressing plate;Lower pressing plate is connected between slider through force sensor, slider is connected with the first end of swing bar through bearing, and the tail end of swing bar is connected with oscillation generating structure through bearing;Driving motor drives oscillation generating structure to make vertical direction circular motion, oscillation generating structure drives swing bar to produce pendulum swing, swing bar drives slider to make up-down reciprocating motion, so as to realize reciprocating stretching oscillation to ski test piece through upper pressing plate and lower pressing plate.The present application is used for ski cyclic loading test.

Description

Technical Field

[0001] This invention relates to a test apparatus and test method for cyclic load testing of skis, and belongs to the field of ski performance testing. Background Technology

[0002] With the development of the ice and snow industry, ice and snow sports are gradually becoming more popular.

[0003] As a key piece of equipment in skiing, the performance of skis directly affects the outcome of the sport. Because the ski market is still in its early stages, ski products mainly occupy the low-to-mid-range market, resulting in inconsistent quality of ski equipment and inadequate product quality management.

[0004] Currently, there is no professional testing method for alpine ski performance, which is detrimental to the healthy development of the ski industry. Therefore, a targeted and widely applicable cyclic load testing method is needed to test the fatigue life of skis, in order to strictly control product quality. Summary of the Invention

[0005] To address the problem that existing skis cannot undergo fatigue life testing under controlled load conditions, which is detrimental to product quality control, this invention provides a ski cyclic load testing device and method.

[0006] The present invention provides a cyclic load testing device for skis, comprising a drive motor, an oscillation generating structure, a slider, a force sensor, a specimen support structure, an upper pressure plate, a lower pressure plate, and a pendulum rod.

[0007] The specimen support structure is used to place the ski specimen; the center of the ski specimen is fixed between the upper pressure plate and the lower pressure plate; the lower pressure plate is connected to the slider through a force sensor, the slider is connected to the beginning of the swing rod through a bearing, and the end of the swing rod is connected to the oscillation generator structure through a bearing.

[0008] The drive motor drives the oscillation generator to make a vertical circular motion. The oscillation generator drives the pendulum to swing in a pendulum-like motion. The pendulum then drives the slider to move up and down reciprocally, thereby realizing the reciprocating tensile oscillation of the ski specimen through the upper and lower pressure plates.

[0009] According to the cyclic load testing device for skis of the present invention, the specimen support structure includes two identical support sections, which are fixed on the test platform and symmetrically distributed on both sides of the slider; the two sides of the ski specimen are placed between two rollers provided on each support section.

[0010] According to the ski cyclic load testing device of the present invention, the oscillation generating structure includes a vertical connecting rod, an amplitude adjusting rod, and a horizontal connecting rod. The vertical connecting rod is fixedly connected to the output shaft of the drive motor. The amplitude adjusting rod includes a horizontal section and a vertical section. The first end of the horizontal section is fixed to the position of the vertical connecting rod by a positioning bolt. The last end of the vertical section is fixedly connected to the first end of the horizontal connecting rod. The last end of the horizontal connecting rod is connected to the end of the pendulum rod by a bearing.

[0011] According to the ski cyclic load testing device of the present invention, the two ends of the slider are fixed on the slide rail, the slide rail is connected to the guide optical axis, and the guide optical axis is supported and fixed by the optical axis bracket.

[0012] According to the ski cyclic load testing device of the present invention, an amplitude scale is provided on the vertical connecting rod, and a scale arrow is provided on the amplitude adjustment rod. The amplitude adjustment rod adjusts the oscillation amplitude of the oscillation generating structure by adjusting the value on the amplitude scale pointed to by the scale arrow.

[0013] According to the ski cyclic load testing apparatus of the present invention, a limit switch is provided on the test bench to record the number of oscillation cycles of the ski specimen.

[0014] According to the ski cyclic load testing apparatus of the present invention, the rollers of the specimen support structure are metal rollers.

[0015] According to the ski cyclic load testing device of the present invention, the roller is internally supported by a bearing.

[0016] The present invention also provides a method for testing cyclic loads on skis, implemented based on the aforementioned cyclic load testing device, comprising:

[0017] Adjust the height of the specimen support structure to ensure that the load exerted by the slider on the ski specimen meets the test requirements; adjust the relative position of the amplitude adjustment rod and the vertical connecting rod to adjust the oscillation amplitude of the slider on the ski specimen, and determine the amplitude of the ski specimen.

[0018] The drive motor is started to make the ski specimen perform a periodic motion from a free state to its center position, then pull it down to the maximum amplitude, and then return it to a free state. During the reciprocating tensile oscillation of the ski specimen, the fatigue failure point of the ski specimen is determined based on the amplitude change of the oscillation force generated by the ski specimen collected by the force sensor.

[0019] According to the cyclic load test method for skis of the present invention, when the center of the ski specimen is at the point of maximum amplitude, the roller structure of the two support sections of the specimen support structure adapts to the movement changes at both ends of the ski specimen.

[0020] The beneficial effects of this invention are as follows: This invention can be used to simulate the cyclic bending and pressurization test of skis. The device of this invention can accurately control the operating parameters according to the preset test spectrum, so that the skis can undergo oscillation load tests and automatically run until the end of the test. It can complete the fatigue life test of skis under cyclic load conditions, thereby realizing product quality monitoring.

[0021] The method of this invention is based on the change in oscillating force when fatigue cracks appear in a material under a constant degree of elastic deformation. By monitoring the change in load, the fatigue failure point of the ski specimen can be determined, thereby realizing fatigue monitoring.

[0022] This invention is used to monitor the lifespan of skis in winter sports and improve the overall performance of skis by testing the materials and performance of skis. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the ski cyclic load testing device described in this invention;

[0024] Figure 2 This is a schematic diagram of the specific connection structure of the slider;

[0025] Figure 3 This is a schematic diagram of the structure connecting the horizontal link and the rocker arm via bearings;

[0026] Figure 4 This is a schematic diagram of the ski cyclic load testing device described in this invention;

[0027] Figure 5 This is a diagram illustrating the principle of amplitude adjustment in an oscillation-generating structure.

[0028] Figure 6 This is a schematic diagram of the mechanical structure for amplitude adjustment;

[0029] Figure 7 This is a detailed structural diagram of the specimen support structure;

[0030] Figure 8 This is a simplified diagram of the slider's motion. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0034] Specific Implementation Method 1: Combination Figures 1 to 3 As shown, the present invention provides a cyclic load testing device for skis, including a drive motor 1, an oscillation generating structure 2, a slider 3, a force sensor 4, a specimen support structure 5, an upper pressure plate 6, a lower pressure plate 7, and a pendulum rod 8.

[0035] The specimen support structure 5 is used to place the ski specimen 9; the center of the ski specimen 9 is fixed between the upper pressure plate 6 and the lower pressure plate 7; the lower pressure plate 7 is connected to the slider 3 through the force sensor 4; the slider 3 is connected to the head end of the swing rod 8 through the bearing; and the end end of the swing rod 8 is connected to the oscillation generating structure 2 through the bearing.

[0036] The drive motor 1 drives the oscillation generating structure 2 to make a vertical circular motion. The oscillation generating structure 2 drives the pendulum 8 to produce a pendulum swing. The pendulum 8 then drives the slider 3 to make up-down reciprocating motion, thereby realizing the reciprocating tensile oscillation of the ski specimen 9 through the upper pressure plate 6 and the lower pressure plate 7.

[0037] The principle of this implementation method is as follows: Figure 4 As shown, it can include three parts: a mechanical system, a control system, and a data acquisition system. It mainly uses a drive motor 1 to rotate the oscillation generating structure 2, causing the pendulum 8 to swing and drive the slider 3 to perform linear reciprocating motion on a fixed track, thereby generating cyclic pressure oscillations on the skis. By adjusting the height of the specimen support structure 5, the load acting on the specimen by the slider 3 is made to meet the test requirements; this load is detected by a force sensor 4. Simultaneously, the force sensor 4 can also monitor the load on the specimen in real time during the test. The oscillation amplitude of the slider 3 on the specimen is determined by adjusting the oscillation generating structure 2. When the test is running, the oscillation frequency of the specimen can be verified by a limit switch installed below the specimen.

[0038] Furthermore, combined with Figure 1 As shown, the specimen support structure 5 includes two identical support sections, which are fixed on the test bench and symmetrically distributed on both sides of the slider 3; the two sides of the ski specimen 9 are placed between the two rollers set on each support section.

[0039] As an example, the rollers of the specimen support structure 5 are metal rollers, and the outer surface of the metal rollers can be bonded with a rubber layer to protect the appearance of the specimen.

[0040] The rollers are supported by high-precision bearings, which allow them to rotate flexibly while providing support.

[0041] When the test bench is in use, the ski's main oscillation position is in the middle. The ski is fixed at both ends by support structures to allow for oscillation. During oscillation, when the center point is at its maximum amplitude, the overall length of the ski must not change. Therefore, the support sections at both ends must not only fix the ski but also accommodate the movement of the ski's ends. The specimen support structure 5 adopts a two-roller 5-1 clamping structure design, such as... Figure 7 As shown. The height of roller 5-1 can be adjusted according to the load requirements of ski specimen 9, and the adjustment range is large, which can meet the requirements of different amplitudes of skis and play a limiting role for skis.

[0042] Accurate ski condition adjustment before the test is a prerequisite for accurate test results. The entire test process involves moving the ski from a free state to pulling the center of the ski down to its maximum amplitude, and then returning it to a free state. When different amplitude requirements are specified for the ski, the positions of the support structures at both ends need to be adjusted to ensure the ski remains in a free state before the test.

[0043] Furthermore, combining Figure 1 As shown, the oscillation generating structure 2 includes a vertical connecting rod 21, an amplitude adjusting rod 22, and a horizontal connecting rod 23. The vertical connecting rod 21 is fixedly connected to the output shaft of the drive motor 1. The amplitude adjusting rod 22 includes a horizontal section and a vertical section. The first end of the horizontal section is fixed to the position of the vertical connecting rod 21 by a positioning bolt. The end of the vertical section is fixedly connected to the first end of the horizontal connecting rod 23. The end of the horizontal connecting rod 23 is connected to the end of the swing rod 8 by a high-precision bearing to ensure that the swing rod 8 operates flexibly.

[0044] Amplitude Adjustment Principle and Method: One of the key technologies of this implementation method is to meet the requirements of different specimen amplitudes. Amplitude adjustment is achieved by adjusting the connection position between the amplitude adjustment rod 22 and the vertical connecting rod 21 to determine the amplitude of the ski. The principle is as follows: Figure 5 As shown. The specific value of the amplitude 2R is determined by the rotation radius R of the amplitude adjustment rod 22. When it is necessary to adjust the amplitude of the ski, the preload at both the positioning bolt and the fixing nut of the vertical connecting rod 21 should be loosened, such as... Figure 6 As shown.

[0045] Furthermore, combining Figure 3 As shown, the two ends of the slider 3 are fixed on the slide rail 31, the slide rail 31 is connected to the guide optical axis 32, and the guide optical axis 32 is supported and fixed by the optical axis bracket 33.

[0046] The working principle of slider 3 is as follows Figure 8 As shown. The movement of slider 3 is constrained by high-precision linear guide rail 31, performing linear reciprocating motion. When the oscillation generating structure 2 rotates, it drives slider 3 to perform reciprocating motion in the up-down direction through the swing arm 8, completing the oscillation action.

[0047] Furthermore, an amplitude scale is set on the vertical connecting rod 21, and a scale arrow is set on the amplitude adjustment rod 22. The amplitude adjustment rod 22 adjusts the oscillation amplitude of the oscillation generating structure 2 by adjusting the value on the amplitude scale pointed to by the scale arrow.

[0048] Combination Figure 6 As shown, the position of the amplitude adjustment rod 22 is adjusted according to the scale on the vertical connecting rod 21. After adjustment, the fixing bolt and the corresponding nut are tightened. This method allows for arbitrary adjustment of the amplitude without any limiting factors.

[0049] Furthermore, combining Figure 1 As shown, a limit switch 10 is installed on the test bench to record the number of oscillation cycles of the ski specimen 9.

[0050] The testing apparatus described in this embodiment can be used for monitoring ski failure.

[0051] Figure 4 As shown, the entire load test process of the skis was monitored by a data acquisition system, with the main data acquisition item being the acquisition of the skis' oscillation force. The oscillation force of the skis was monitored by a force sensor connected to the slider, and its acquisition frequency was much higher than the oscillation frequency of the skis, which was fully capable of showing the changes in the oscillation force of the skis during the test.

[0052] Specific Implementation Method Two: Combination Figure 1 and Figure 2 As shown, the present invention also provides a method for testing cyclic loads on skis, implemented based on the cyclic load testing apparatus for skis described in Specific Embodiment 1, comprising:

[0053] Adjust the height of the specimen support structure 5 so that the load of the slider 3 on the ski specimen 9 meets the test requirements; adjust the relative position of the amplitude adjustment rod 22 and the vertical connecting rod 21 to adjust the oscillation amplitude of the slider 3 on the ski specimen 9, and determine the amplitude of the ski specimen 9.

[0054] Start the drive motor 1 to make the ski specimen 9 perform a periodic motion from the free state to its center position to the maximum amplitude, and then return to the free state; during the process of making the ski specimen 9 reciprocate tensile oscillation, the fatigue failure point of the ski specimen 9 is determined based on the amplitude change of the oscillation force generated by the ski specimen 9 collected by the force sensor 4.

[0055] Before the test begins, the performance parameters of the ski specimen 9 should be confirmed, and the required amplitude for the ski test should be determined through cyclic loading. Adjust the relative position of the amplitude adjustment rod 22 and the vertical connecting rod 21 so that the arrow on the scale of the amplitude adjustment rod 22 points to the corresponding amplitude value on the vertical connecting rod 21, and adjust the amplitude accordingly. After the adjustment is complete, use positioning bolts to position the amplitude adjustment rod 22 to prevent changes in amplitude during the test from affecting the test results.

[0056] Fix the center of the ski specimen 9 between the upper pressure plate 6 and the lower pressure plate 7, ensuring the lock nuts are tight to prevent loosening. Adjust the position of the specimen support structure 5 on the test bench according to the length of the ski specimen 9. After determining the position, adjust the position of the two rollers on each support section so that they just clamp the ski. At this point, the ski should be in a free state, unloaded. Simultaneously, check the flexibility of the fixed rollers, ensuring they can rotate freely with the movement of the ski.

[0057] After the experiment begins, drive motor 1 provides the power source and can be fixed to the motor base on the lower surface of the test bench. The rotation of the motor drives the oscillation generating structure 2 to rotate accordingly. Both ends of the pendulum 8 are high-precision ball bearings. As the oscillation generating structure 2 rotates, the pendulum 8 reciprocates. The slider 3 is fixed to the slide rail 31, which runs through the high-precision guide optical shaft 32. Figure 2 As shown, slider 3 can only move up and down, and finally, through its connection with the pressure plate, it loads the skis to move back and forth.

[0058] A force sensor 4 is connected between the slider 3 and the lower pressure plate 7. The force sensor 4 can monitor the load applied to the skis in real time, which serves as the basis for judging ski failure.

[0059] The primary fatigue failure mode of skis is material failure, where the material changes from elastic deformation to plastic deformation. The most obvious change is a decrease in oscillating force. By monitoring load changes through a data acquisition system, fatigue failure is detected when the parameters monitored by the force sensor decrease, thus enabling fatigue monitoring.

[0060] When the center of the ski specimen 9 is at the point of maximum amplitude, the roller structure of the two support sections of the specimen support structure 5 adapts to the movement changes at both ends of the ski specimen 9.

[0061] Before the test, the performance parameters of the skis were confirmed, and the required amplitude for the ski test was determined through cyclic loading. The center position of the skis was fixed between the upper and lower pressure plates, ensuring the lock nuts were tight to prevent loosening. The position of the specimen support structure 5 on the test platform was adjusted according to the length of the skis. After determining the position, the positions of the two rollers on the support structure were adjusted so that they just clamped the skis. Simultaneously, the flexibility of the fixed rollers was checked, ensuring they could rotate freely with the movement of the skis. Both support sections were adjusted and checked in the same manner.

[0062] When using a control system, simply input the required ski vibration frequency and load alarm limit to start the test. During the test, the monitoring system will automatically record the ski's load changes, oscillation frequency, running time, and number of cycles. If the load on the ski decreases significantly during the test, reaching the preset limit, the equipment will issue an alarm and stop operating. This indicates that the ski has experienced fatigue failure.

[0063] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A cyclic load testing device for skis, characterized in that... It includes a drive motor (1), an oscillation generating structure (2), a slider (3), a force sensor (4), a specimen support structure (5), an upper pressure plate (6), a lower pressure plate (7), and a swing rod (8). The specimen support structure (5) is used to place the ski specimen (9); the center of the ski specimen (9) is fixed between the upper pressure plate (6) and the lower pressure plate (7); the lower pressure plate (7) is connected to the slider (3) through the force sensor (4), the slider (3) is connected to the head end of the swing rod (8) through the bearing, and the end of the swing rod (8) is connected to the oscillation generating structure (2) through the bearing; The drive motor (1) drives the oscillation generating structure (2) to make a vertical circular motion. The oscillation generating structure (2) drives the pendulum (8) to generate a pendulum swing. The pendulum (8) then drives the slider (3) to make up-down reciprocating motion, thereby realizing the reciprocating tensile oscillation of the ski specimen (9) through the upper pressure plate (6) and the lower pressure plate (7). During the process of reciprocating tensile oscillation of the ski specimen (9), the fatigue failure point of the ski specimen (9) is determined based on the amplitude change of the oscillation force generated by the ski specimen (9) collected by the force sensor (4). The specimen support structure (5) includes two identical support sections, which are fixed on the test bench and symmetrically distributed on both sides of the slider (3); the two sides of the ski specimen (9) are placed between the two rollers set on each support section. The oscillation generating structure (2) includes a vertical connecting rod (21), an amplitude adjusting rod (22), and a horizontal connecting rod (23). The vertical connecting rod (21) is fixedly connected to the output shaft of the drive motor (1). The amplitude adjusting rod (22) includes a horizontal section and a vertical section. The first end of the horizontal section is fixed to the position of the vertical connecting rod (21) by a positioning bolt. The end of the vertical section is fixedly connected to the first end of the horizontal connecting rod (23). The end of the horizontal connecting rod (23) is connected to the end of the swing rod (8) by a bearing. The two ends of the slider (3) are fixed on the slide rail (31), the slide rail (31) is connected to the guide optical axis (32), and the guide optical axis (32) is supported and fixed by the optical axis bracket (33); An amplitude scale is set on the vertical connecting rod (21), and a scale arrow is set on the amplitude adjustment rod (22). The amplitude adjustment rod (22) adjusts the oscillation amplitude of the oscillation generating structure (2) by adjusting the value on the amplitude scale pointed to by the scale arrow.

2. The ski cyclic load testing device according to claim 1, characterized in that, A limit switch (10) is set on the test bench to record the number of oscillation cycles of the ski specimen (9).

3. The ski cyclic load testing device according to claim 2, characterized in that, The rollers of the specimen support structure (5) are metal rollers.

4. The ski cyclic load testing device according to claim 3, characterized in that, The rollers are internally supported by bearings.

5. A method for testing cyclic loads on skis, implemented based on the cyclic load testing apparatus for skis as described in claim 1, characterized in that... include: Adjust the height of the specimen support structure (5) so that the load of the slider (3) on the ski specimen (9) meets the test requirements; adjust the relative position of the amplitude adjustment rod (22) and the vertical connecting rod (21) to adjust the oscillation amplitude of the slider (3) on the ski specimen (9) and determine the amplitude of the ski specimen (9); Start the drive motor (1) to make the ski specimen (9) perform a periodic motion from the free state to its center position to the maximum amplitude, and then return to the free state; during the process of making the ski specimen (9) reciprocate tensile oscillation, the fatigue failure point of the ski specimen (9) is determined according to the amplitude change of the oscillation force generated by the ski specimen (9) collected by the force sensor (4).

6. The method for cyclic load testing of skis according to claim 5, characterized in that, When the center of the ski specimen (9) is at the point of maximum amplitude, the roller structure of the two support sections of the specimen support structure (5) adapts to the movement changes at both ends of the ski specimen (9).

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