Fatigue test equipment for aero seat structural member

Abstract

The invention relates to the technical field of fatigue testing, and discloses aero seat structural member fatigue testing equipment, which comprises a detection table, a torsion disc assembly is arranged at the top of the detection table, and a coil spring in an aero seat is clamped at the top of the torsion disc assembly; four groups of guide rods are fixedly mounted between the top wall and the bottom wall of the detection table, an upper supporting plate and a lower supporting frame are slidably connected to the guide rods, and a sliding frame is slidably connected between the upper supporting plate and the lower supporting frame; a rotation driving part is arranged on the sliding frame, and a transmission gear set is arranged between the rotation driving part and the torsion disc assembly. The reflector lamp irradiates the indicator board, and the initial scale of the angle scale irradiated by the reflector lamp is read; and after the torsion disc body is reset, the spotlight irradiates a scale on the angle scale again, so that whether the elasticity of the coil spring can be reset to the initial state or not is judged according to the difference of the scales irradiated on the angle scale by the spotlight before and after the torsion disc body rotates, and the purpose of conveniently detecting the fatigue limit of the coil spring is achieved.

Description

Technical Field

[0001] This invention relates to the field of fatigue testing technology, specifically to a fatigue testing device for aircraft seat structural components. Background Technology

[0002] An aircraft seat is a seat installed inside an aircraft. It consists of a seat cushion and a backrest. The seat cushion can be raised, lowered, and moved forward and backward, while the backrest can be tilted relative to the seat cushion. An adjuster is located between the backrest and the seat cushion. Inside the adjuster is a coil spring. The spring's elasticity allows the tilted backrest to return to its original position. Therefore, the elasticity of the coil spring is crucial for adjusting the angle of the aircraft seat, and it is necessary to test the fatigue limit of the coil spring to determine the number of times the seat backrest can tilt.

[0003] Chinese patent CN113758734B, filed on June 1, 2020, discloses a seat fatigue testing system, relating to the field of seat fatigue testing technology, with the main objective of achieving multi-point testing of seats. The main technical solution adopted is a seat fatigue testing system comprising: a test bench base with a seat mounting area at a first position; and a load loading unit including a first load loading component and a second load loading component. The first load loading component is disposed at a second position on the test bench base, and the second load loading component is slidably disposed on a sliding track at a third position on the test bench base to adjust the relative position of the second load loading component to the seat mounting area at the first position on the test bench base. Compared to existing technologies, this system can conveniently perform multi-point fatigue testing.

[0004] In this technical solution, fatigue testing of the complete seat requires sampling of finished products for inspection. Individual testing of seat components (coil springs) is not possible; if a component fails to meet quality standards, the entire batch of finished products becomes defective, resulting in significant costs and necessitating further improvements. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fatigue testing device for aircraft seat structural components. It has advantages such as facilitating the detection of the fatigue limit of disc springs and solves the problem of only testing the entire seat without individually testing individual components. If the components are substandard, a large number of finished products become defective, resulting in high costs.

[0006] To achieve the aforementioned objective of facilitating the testing of the fatigue limit of coil springs, the present invention provides the following technical solution: a fatigue testing device for aircraft seat structural components, comprising a testing platform, a torsion disc assembly disposed on the top of the testing platform, and a coil spring in the aircraft seat being engaged with the top of the torsion disc assembly; four sets of guide rods are fixedly installed between the top and bottom walls of the testing platform, an upper support plate and a lower support frame are slidably connected to the guide rods, the upper support plate is located above the lower support frame, and a sliding frame is slidably connected between the upper support plate and the lower support frame; a rotation drive component is disposed on the sliding frame, and a transmission gear set is disposed between the rotation drive component and the torsion disc assembly. Preferably, the torsion disc assembly includes a torsion disc body rotatably connected to the top of the testing platform, a bearing ring is fixedly installed on the top of the testing platform, the bearing ring is sleeved on the outside of the torsion disc body, an arc-shaped push plate is fixedly installed at the top edge of the torsion disc body, and an arc-shaped baffle is fixedly installed on the top of the bearing ring, the arc-shaped push plate and the arc-shaped baffle being engaged with both ends of the coil spring respectively. Preferably, an indicator plate is fixedly installed on the top of the testing platform, the arc center of the indicator plate coincides with the axis of the torsion disk body, an angle scale is provided on the inner side of the indicator plate, and a spotlight is fixedly installed at the center of the torsion disk body, the spotlight is arranged along the radial direction of the torsion disk body.

[0007] Preferably, a sliding groove is provided through the right half of the upper support plate, and a slider is slidably connected in the sliding groove. An extension plate is fixedly installed at the bottom right end of the slider, and the extension plate is attached to the bottom of the upper support plate. A vertical rod is slidably connected through the right end of the extension plate, and a connecting plate is fixedly installed at the bottom end of the vertical rod. The connecting plate is attached to the top wall of the testing table, and a support frame is fixedly installed at the left end of the connecting plate. A collar is rotatably connected in the support frame, and the support frame is slidably connected to the top wall of the testing table.

[0008] Preferably, a fixing plate is fixedly installed on the bottom of both the front and rear sides of the lower support frame. An inclined groove is opened through the fixing plate. A U-shaped frame is slidably connected to the bottom wall of the testing platform. A sliding column is fixedly installed on one of the opposite sides of both ends of the U-shaped frame. The sliding column is slidably connected in the inclined groove. A threaded rod is rotatably connected to the bottom wall of the testing platform. The threaded rod is threadedly connected to the U-shaped frame.

[0009] Preferably, the sliding frame includes a base slidably connected to the top of the lower support frame, with L-shaped plates fixedly installed on both the front and rear sides of the base. The two L-shaped plates are slidably connected to the front and rear sides of the upper support plate, respectively. A threaded rod is rotatably connected to the left end of the L-shaped plate, and a lug is fixedly installed on the lower surface of the left half of the upper support plate. The threaded rod is threadedly connected to the lug.

[0010] Preferably, the transmission gear set includes a first rotating shaft rotatably connected through the center of the upper support plate, and a second rotating shaft rotatably connected through the center of the slider. Supports are fixedly installed on the circumferential surfaces of both the first and second rotating shafts. The two supports are respectively attached to the top of the upper support plate and the top of the slider. Raised strips are fixedly installed on the upper half of the circumferential surfaces of both the first and second rotating shafts. The transmission gear set also includes a first gear and a second gear, which mesh with each other. A connecting pipe is fixedly installed at the center of the bottom of the torsion disc body. The first rotating shaft is inserted into the center of the first gear and inside the connecting pipe, and the second rotating shaft is inserted into the center of the second gear and inside the collar. The two supports are respectively attached to the bottom of the first and second gears. The connecting pipe is attached to the top of the first gear, and the collar is attached to the top of the second gear.

[0011] Preferably, the rotation drive component includes a drive disk rotatably connected to the lower half of the second rotating shaft. The drive disk has support arms arranged in an array along its edge. An avoidance arc surface is provided between two adjacent support arms. A straight groove is provided through the middle of each support arm. A motor is fixedly installed at the bottom of the base. A rotating arm and a fan-shaped plate are fixedly installed at the output end of the motor. A push column is fixedly installed at the top of the end of the rotating arm away from the motor. The push column is slidably connected in the straight groove. The fan-shaped plate is attached to the avoidance arc surface. A connecting component is provided between the drive disk and the second rotating shaft.

[0012] Preferably, two guide rails are fixedly installed on the bottom wall of the right half of the sliding frame; the connecting assembly includes a left clamping plate and a right clamping plate, both of which have semi-circular arc surfaces on opposite sides; two pads are fixedly installed at the bottom of both the left and right clamping plates, and the pads are slidably connected to the guide rails; a reverse transmission component is provided between the left and right clamping plates; a mounting cover is fixedly installed at the center of the bottom of the drive disk; U-shaped plates are slidably connected in an array on the circumferential surface of the mounting cover; the U-shaped plates are V-shaped at one end outside the mounting cover; an arc-shaped pressure plate is fixedly installed at one end inside the mounting cover; a spring is fixedly installed between the U-shaped plate and the outer wall of the mounting cover; the mounting cover is sleeved on the outer side of the bottom end of the second rotating shaft; a friction wheel is fixedly installed at the bottom end of the second rotating shaft; the arc-shaped pressure plate is attached to the circumferential surface of the friction wheel; and the arc surfaces of the left and right clamping plates are attached to the V-shaped ends of the U-shaped plates.

[0013] Preferably, the reverse transmission component includes two rack plates, which are respectively fixedly installed on the pads at the bottom of the left and right clamping plates, and a gear three meshes between the two rack plates; a fixing plate two is fixedly installed on the left side of the left clamping plate, and a sliding column two is fixedly installed at the bottom left end of the fixing plate two; a turntable is connected to the motor output end, the turntable is located on the lower side of the rotating arm, and the top of the turntable has an inner arc groove and an outer arc groove, the radius of the outer arc groove is larger than the radius of the inner arc groove, and the ends of the inner arc groove and the outer arc groove are connected by a connecting groove; the sliding column two is slidably connected in the inner arc groove, the outer arc groove and the connecting groove; a concave plate is fixedly installed on each of the two rack plates, and when the two rack plates move in opposite directions, the two concave plates move closer to the mounting cover; a friction plate is slidably connected on the concave plate, and a spring two is fixedly installed between the friction plate and the spring two, the spring two being used to drive the friction plate closer to the mounting cover. (III) Beneficial Effects Compared with the prior art, the present invention provides a fatigue testing device for aircraft seat structural components, which has the following beneficial effects:

[0014] 1. This fatigue testing equipment for aircraft seat structural components places the disc spring to be tested on the top of the torsion disc body and the bearing ring. An arc-shaped push plate and an arc-shaped baffle are respectively engaged with both ends of the disc spring. A spotlight illuminates the indicator plate, and the initial reading on the angle scale illuminated by the spotlight is recorded. The rotating arm and push column are driven by a motor to rotate. During the process of the push column sliding inside the straight groove, the sliding column slides inside the outer arc groove. The left and right clamping plates remain in contact with each other. Under the pressure of the left or right clamping plates, the arc-shaped pressure plate presses against the circumferential surface of the friction wheel. When the drive disc rotates, it causes the mounting cover to rotate, which, in conjunction with the arc-shaped pressure plate, presses against the friction wheel, causing the second rotating shaft and the second fixed plate to rotate. This, in turn, causes the first rotating shaft and the torsion disc body to rotate, making the torsion disc body rotate relative to the bearing ring, thus causing the disc spring to torsion. After the torsion disc body returns to its original position, the spotlight shines on a mark on the angle scale again. By comparing the difference between the marks on the angle scale before and after the torsion disc body rotates, it can be determined whether the disc spring is elastic enough to return to its initial state, thereby facilitating the detection of the disc spring's fatigue limit. 2. This fatigue testing equipment for aircraft seat structural components, by screwing on threaded rod one, moves the U-shaped frame from right to left along the bottom wall of the testing platform. Sliding column one slides to the left along the inclined groove, causing the lower support frame and fixed plate one to move downwards. This, in turn, causes the upper support plate and sliding frame to move downwards along the guide rod, disengaging the transmission gear set from the bottom of the torsion disc body. Gear one and gear two with the required gear ratio are then replaced, and the slider slides accordingly inside the groove to adapt to the gear ratio of gear one and gear two. The U-shaped frame is then rotated in the opposite direction, causing the lower support frame, sliding frame, and upper support plate to move upwards until rotating shaft one is inserted into the connecting tube and rotating shaft two is inserted into the collar, completing the replacement of gear one and gear two. Replacing gear one and gear two facilitates adjustment of the disc spring's torsion angle each time, allowing for the testing of the disc spring's fatigue limit at different torsion angles. 3. In this fatigue testing equipment for aircraft seat structural components, after the push column separates from the linear groove, the elasticity of spring two causes the friction plate to press against the surface of the mounting cover, preventing the drive disc and mounting cover from continuing to rotate under inertia. Simultaneously, the left and right clamping plates separate, and the arc-shaped pressure plate moves outward under the elasticity of spring one, separating from the friction wheel. As a result, the torsion disc body rotates in the opposite direction to reset under the elasticity of the disc spring, and the friction wheel rotates relative to the mounting cover, preventing the drive disc from rotating with the rotating shaft two. This ensures that the resistance encountered by the disc spring during torsion reset is small, and the resistance encountered during multiple resets is relatively stable. At the same time, the drive disc rotates only under the drive of the rotating arm and push column, ensuring that the shape of the drive disc remains consistent each time the push column enters the linear groove, and that the time difference between two adjacent torsion cycles of the disc spring remains consistent, ensuring stable testing conditions. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 2 This is a front view schematic diagram of a fatigue testing device for aircraft seat structural components proposed in this invention; Figure 3 This is a three-dimensional structural diagram of the torsion disc assembly of a fatigue testing device for aircraft seat structural components proposed in this invention; Figure 4 This is a three-dimensional structural diagram of the lower support frame of a fatigue testing device for aircraft seat structural components proposed in this invention; Figure 5 This is a three-dimensional structural diagram of the upper support plate and sliding frame of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 6 This is a three-dimensional structural diagram of the upper support plate and transmission gear set of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 7 This is a three-dimensional structural diagram of the transmission gear set and rotation drive component of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 8 This is a three-dimensional structural diagram of the rotating shaft and connecting pipe of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 9 This is a three-dimensional structural diagram of the sliding frame and connecting components of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 10 This is a three-dimensional structural diagram of the reverse transmission component of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 11 This is a three-dimensional structural diagram of the left and right clamping plates of a fatigue testing device for aircraft seat structural components proposed in this invention. Figure 12 This is a schematic diagram of the mounting cover and friction plate structure of a fatigue testing device for aircraft seat structural components proposed in this invention.

[0016] In the diagram: 100, testing table; 200, torsion disc assembly; 300, guide rod; 400, upper support plate; 500, lower support frame; 600, sliding frame; 700, transmission gear set; 800, rotation drive component; 900, connecting assembly; 201. Torque disc body; 202. Bearing ring; 203. Arc-shaped push plate; 204. Arc-shaped baffle; 205. Indicator plate; 206. Angle scale; 207. Spotlight; 401. Slide rail; 402. Slider; 403. Extension plate; 404. Vertical rod; 405. Connecting plate; 406. Support frame; 407. Collar; 501. Fixed plate 1; 502. Inclined groove; 503. U-shaped frame; 504. Sliding column 1; 505. Threaded rod 1; 601. Base; 602. L-shaped plate; 603. Threaded rod II; 604. Lug; 605. Guide rail; 701. Shaft 1; 702. Shaft 2; 703. Support; 704. Protruding strip; 705. Gear 1; 706. Gear 2; 707. Connecting pipe; 801. Drive plate; 802. Support arm; 803. Straight groove; 804. Avoidance arc surface; 805. Motor; 806. Swing arm; 807. Push column; 808. Sector plate; 901. Left clamping plate; 902. Right clamping plate; 903. Pad plate; 904. Rack plate; 905. Gear three; 906. Fixing plate two; 907. Sliding column two; 908. Turntable; 909. Inner arc groove; 910. Outer arc groove; 911. Connecting groove; 912. Mounting cover; 913. U-shaped plate; 914. Arc-shaped pressure plate; 915. Spring one; 916. Friction wheel; 917. Concave plate; 918. Friction plate; 919. Spring two. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-2 A fatigue testing device for aircraft seat structural components includes a testing platform 100. A torsion disk assembly 200 is mounted on the top of the testing platform 100, and a disc spring from the aircraft seat is engaged with the top of the torsion disk assembly 200. Four sets of guide rods 300 are fixedly installed between the top and bottom walls of the testing platform 100. An upper support plate 400 and a lower support frame 500 are slidably connected to the guide rods 300. The upper support plate 400 is located above the lower support frame 500, and a sliding frame 600 is slidably connected between the upper support plate 400 and the lower support frame 500. A rotation drive component 800 is mounted on the sliding frame 600, and a transmission gear set 700 is provided between the rotation drive component 800 and the torsion disk assembly 200.

[0019] Please see Figure 3 The torsion disc assembly 200 includes a torsion disc body 201 rotatably connected to the top of the testing table 100. A bearing ring 202 is fixedly installed on the top of the testing table 100, and the bearing ring 202 is sleeved on the outside of the torsion disc body 201. An arc-shaped push plate 203 is fixedly installed at the top edge of the torsion disc body 201, and an arc-shaped baffle 204 is fixedly installed on the top of the bearing ring 202. The arc-shaped push plate 203 and the arc-shaped baffle 204 are respectively engaged at both ends of the disc spring. The top of the bearing ring 202 is flush with the top of the torsion disc body 201 to prevent the disc spring from tilting when it is placed. By rotating the torsion disc body 201 relative to the bearing ring 202, the arc-shaped push plate 203 pushes the disc spring to twist. Then, the elasticity of the disc spring drives the torsion disc body 201 to rotate and return to its original position.

[0020] An indicator plate 205 is fixedly installed on the top of the testing platform 100. The center of the arc of the indicator plate 205 coincides with the axis of the torsion disk body 201. An angle scale 206 is provided on the inner side of the indicator plate 205. A spotlight 207 is fixedly installed at the center of the torsion disk body 201, and the spotlight 207 is arranged along the radial direction of the torsion disk body 201. The spotlight 207 shines on the indicator plate 205. When the disc spring drives the torsion disk body 201 to reset, if the elasticity of the disc spring decreases, the position of the spotlight 207 on the indicator plate 205 will deviate before and after the torsion disk body 201 rotates. The difference in readings on the angle scale 206 between two previous and subsequent illuminations by the spotlight 207 indicates the change in the elasticity of the disc spring.

[0021] Please see Figures 4-5A fixing plate 501 is fixedly installed on the bottom of both the front and rear sides of the lower support frame 500. An inclined groove 502 is formed through the fixing plate 501. A U-shaped frame 503 is slidably connected to the bottom wall of the testing table 100. Sliding columns 504 are fixedly installed on opposite sides of both ends of the U-shaped frame 503, and the sliding columns 504 are slidably connected within the inclined groove 502. A threaded rod 505 is rotatably connected to the bottom wall of the testing table 100, and the threaded rod 505 is threadedly connected to the U-shaped frame 503. By rotating the threaded rod 505, the U-shaped frame 503 slides along the left and right direction on the bottom wall of the testing table 100, and the sliding columns 504 slide within the inclined groove 502, thereby causing the lower support frame 500 to move up and down along the guide rod 300. After the lower support frame 500 descends, the transmission gear set 700 can be removed from between the torsion disc assembly 200 and the rotation drive component 800. By replacing the transmission gear set 700 with different gear ratios, the angle of rotation of the torsion disc body 201 can be adjusted each time. This allows for the detection of the fatigue limit of the disc spring under different rotation angles.

[0022] Please see Figures 5-6 The sliding frame 600 includes a base 601 slidably connected to the top of the lower support frame 500. L-shaped plates 602 are fixedly installed on both the front and rear sides of the base 601. The two L-shaped plates 602 are slidably connected to the front and rear sides of the upper support plate 400, respectively. A threaded rod 603 is rotatably connected to the left end of each L-shaped plate 602. A lug 604 is fixedly installed on the lower surface of the left half of the upper support plate 400, and the threaded rod 603 is threadedly connected to the lug 604. When changing the transmission gear set 700, the gear ratio changes, and the spacing between the gears inside the transmission gear set 700 changes. This causes the base 601 and L-shaped plates 602 to slide along the upper support plate 400 by turning the threaded rod 603, adapting to the change in the gear spacing.

[0023] Please see Figure 6 A groove 401 is formed through the right half of the upper support plate 400. A slider 402 is slidably connected within the groove 401. An extension plate 403 is fixedly installed at the bottom right end of the slider 402. The extension plate 403 is attached to the bottom of the upper support plate 400. A vertical rod 404 is slidably connected through the right end of the extension plate 403. A connecting plate 405 is fixedly installed at the bottom end of the vertical rod 404. The connecting plate 405 is attached to the top wall of the testing table 100. A support frame 406 is fixedly installed at the left end of the connecting plate 405. A collar 407 is rotatably connected within the support frame 406. The support frame 406 is slidably connected to the top wall of the testing table 100. Through the connection of the extension plate 403, the vertical rod 404, and the connecting plate 405, the slider 402 and the support frame 406 move synchronously.

[0024] Please see Figures 6-8The transmission gear set 700 includes a first rotating shaft 701 rotatably connected through the center of the upper support plate 400, and a second rotating shaft 702 rotatably connected through the center of the slider 402. Supports 703 are fixedly mounted on the circumferential surfaces of both rotating shafts 701 and 702, respectively fitting against the top of the upper support plate 400 and the top of the slider 402. Protrusions 704 are fixedly mounted on the upper circumferential surfaces of both rotating shafts 701 and 702. Thus, the position of rotating shaft 701 on the upper support plate 400 is fixed, while rotating shaft 702 can move with the slider 402 within the slide groove 401. Therefore, the distance between rotating shafts 701 and 702 can be adjusted to accommodate changes in the distance between the gears.

[0025] The transmission gear set 700 also includes gear one 705 and gear two 706, which mesh with each other. A coupling tube 707 is fixedly installed at the center of the bottom of the torsion disc body 201. Rotary shaft one 701 is inserted into the center of gear one 705 and inside the coupling tube 707. Rotary shaft two 702 is inserted into the center of gear two 706 and inside the collar 407. Two supports 703 are respectively attached to the bottom of gear one 705 and gear two 706. The coupling tube 707 is attached to the top of gear one 705 and the collar 407 is attached to the top of gear two 706. When replacing gear 1 705 and gear 2 706, the lower support frame 500 is moved downward to place gear 1 705 and gear 2 706 on top of the support 703. The lower support frame 500 is then moved upward to insert shaft 1 701 into the connecting pipe 707 and shaft 2 702 into the collar 407, thus completing the replacement of gear 1 705 and gear 2 706.

[0026] Please see Figures 6-8 The rotating drive component 800 includes a drive disk 801 rotatably connected to the lower half of the rotating shaft 702. Support arms 802 are arrayed along the edge of the drive disk 801, and a clearance arc surface 804 is provided between adjacent support arms 802. A straight groove 803 is formed through the middle of each support arm 802. A motor 805 is fixedly mounted on the bottom of the base 601. A rotating arm 806 and a sector plate 808 are fixedly mounted on the output end of the motor 805. A push column 807 is fixedly mounted on the top of the end of the rotating arm 806 away from the motor 805. The push column 807 is slidably connected within the straight groove 803, and the sector plate 808 is fitted against the clearance arc surface 804. The positioning effect of the sector plate 808 and the clearance arc surface 804 facilitates the determination of the motor 805's installation position when installing the rotating arm 806 and the motor 805.

[0027] The rotating arm 806 is driven to rotate by the motor 805, and the push column 807 performs a circular motion. During rotation, the push column 807 first inserts into the straight groove 803, pushing the drive disk 801 and the straight groove 803 to deflect. After the drive disk 801 follows the push column 807 to deflect a certain angle, the push column 807 disengages from the straight groove 803. In this embodiment, there are six sets of support arms 802, so that when the rotating arm 806 rotates one revolution, the drive disk 801 rotates 60°. A connecting assembly 900 is provided between the drive disk 801 and the rotating shaft 702. When the rotating arm 806 and the push column 807 drive the drive disk 801 to deflect, the connecting assembly 900 connects the drive disk 801 to the second rotating shaft 702, causing the second rotating shaft 702 to rotate with the drive disk 801, thereby driving the second gear 706, the first gear 705 and the torsion disk body 201 to rotate; when the push column 807 disengages from the straight groove 803, the connecting assembly 900 releases the connection between the drive disk 801 and the second rotating shaft 702, and when the disc spring drives the torsion disk body 201 to rotate in the opposite direction to reset, the second rotating shaft 702 can rotate relative to the drive disk 801.

[0028] Please see Figures 9-12 Two guide rails 605 are fixedly installed on the bottom wall of the right half of the sliding frame 600. Specifically, the guide rails 605 are fixedly installed on the top of the right half of the base 601. The connecting assembly 900 includes a left clamping plate 901 and a right clamping plate 902. The opposite sides of the left clamping plate 901 and the right clamping plate 902 are both semi-circular arc surfaces. Two pads 903 are fixedly installed at the bottom of the left clamping plate 901 and the right clamping plate 902. The pads 903 are slidably connected to the guide rails 605. A reverse transmission component is provided between the left clamping plate 901 and the right clamping plate 902. The reverse transmission component drives the left clamping plate 901 and the right clamping plate 902 to move simultaneously towards each other or simultaneously away from each other.

[0029] A mounting cover 912 is fixedly installed at the center of the bottom of the drive disk 801. When the drive disk 801 rotates, it drives the mounting cover 912 to rotate synchronously. U-shaped plates 913 are slidably connected in an array through the circumference of the mounting cover 912. The outer end of the U-shaped plate 913 is V-shaped, and the inner end of the U-shaped plate 913 is fixedly installed with an arc-shaped pressure plate 914. A spring 915 is fixedly installed between the U-shaped plate 913 and the outer wall of the mounting cover 912. The mounting cover 912 is sleeved on the outer side of the bottom end of the second rotating shaft 702. A friction wheel 916 is fixedly installed at the bottom end of the second rotating shaft 702. The arc-shaped pressure plate 914 is attached to the circumference of the friction wheel 916. The arc-shaped surfaces of the left clamping plate 901 and the right clamping plate 902 are attached to the V-shaped end of the U-shaped plate 913. When the left clamping plate 901 and the right clamping plate 902 move towards each other, they compress the V-shaped end of the U-shaped plate 913, thereby pressing the arc-shaped pressure plate 914 against the circumferential surface of the friction wheel 916. When the drive disc 801 rotates, it drives the mounting cover 912 to rotate, thereby driving the friction wheel 916 and the rotating shaft 702 to rotate. Furthermore, a rubber sheet can be fixedly installed inside the arc-shaped pressure plate 914. When the arc-shaped pressure plate 914 is pressed against the circumferential surface of the friction wheel 916, the rubber sheet can deform, ensuring the friction between the rubber sheet and the friction wheel 916.

[0030] The reverse transmission component includes two rack plates 904, which are fixedly mounted on pads 903 at the bottom of the left clamping plate 901 and the right clamping plate 902, respectively. A gear 905 meshes between the two rack plates 904 and is rotatably connected to the base 601. Through the meshing action of the gear 905 and the rack plates 904, the left clamping plate 901 and the right clamping plate 902 move in opposite directions.

[0031] A fixing plate 906 is fixedly installed on the left side of the left clamping plate 901. A sliding column 907 is fixedly installed at the bottom left end of the fixing plate 906. A turntable 908 is connected to the output end of the motor 805. The turntable 908 is located under the rotating arm 806. The top of the turntable 908 has an inner arc groove 909 and an outer arc groove 910. The radius of the outer arc groove 910 is larger than the radius of the inner arc groove 909. The ends of the inner arc groove 909 and the outer arc groove 910 are connected by a connecting groove 911. The sliding column 907 is slidably connected in the inner arc groove 909, the outer arc groove 910 and the connecting groove 911.

[0032] When the second sliding column 907 slides into the inner arc groove 909, the distance between the left clamping plate 901 and the turntable 908 is small; when the second sliding column 907 slides into the outer arc groove 910, the distance between the left clamping plate 901 and the turntable 908 is large. The turntable 908 rotates counterclockwise. When the second sliding column 907 moves along the connecting groove 911 towards the outer arc groove 910, the left clamping plate 901 moves away from the turntable 908; when the second sliding column 907 moves along the connecting groove 911 towards the inner arc groove 909, the left clamping plate 901 moves closer to the turntable 908.

[0033] Specifically, when the second sliding column 907 slides to the rear end of the outer arc groove 910, the push column 807 just inserts into the straight groove 803; when the push column 807 disengages from the straight groove 803, the second sliding column 907 slides to the front end of the outer arc groove 910. During this process, the left clamping plate 901 and the right clamping plate 902 are in a mutually fitted state. When the second sliding column 907 slides out from the front end of the outer arc groove 910 and enters the connecting groove 911, the arc-shaped pressure plate 914 separates from the friction wheel 916. At this time, the torsion disc body 201 resets under the elastic action of the disc spring, and the second rotating shaft 702 and the friction wheel 916 rotate in opposite directions to prevent the drive disc 801 and the mounting cover 912 from rotating in the opposite direction with the second rotating shaft 702. When the second sliding column 907 slides into the inner arc groove 909, the left clamping plate 901 and the right clamping plate 902 separate from the U-shaped plate 913, and the first spring 915 is in a freely extended state.

[0034] Two rack plates 904 are fixedly mounted with concave plates 917. When the two rack plates 904 move in opposite directions, the two concave plates 917 move closer to the mounting cover 912. A friction plate 918 is slidably connected to the concave plate 917. A second spring 919 is fixedly mounted between the friction plate 918 and the second spring 919. The second spring 919 is used to drive the friction plate 918 to move closer to the mounting cover 912. When the second sliding column 907 slides inside the outer arc groove 910, the left clamping plate 901 and the right clamping plate 902 are in contact with each other, the distance between the two concave plates 917 is relatively large, the compression distance of the second spring 919 is relatively small, and the friction between the friction plate 918 and the mounting cover 912 is relatively small; when the second sliding column 907 slides from the outer arc groove 910 to the inside of the connecting groove 911, the two concave plates 917 move closer to each other, the compression distance of the second spring 919 is large, and the friction between the mounting cover 912 and the friction plate 918 is large; this prevents the drive disc 801 and the support arm 802 from continuing to rotate under inertia.

[0035] In use, by screwing the threaded rod 505, the U-shaped frame 503 is moved from right to left along the bottom wall of the testing table 100, and the sliding column 504 slides to the left along the inclined groove 502, causing the lower support frame 500 and the fixed plate 501 to move downward, thereby causing the upper support plate 400 and the sliding frame 600 to move downward along the guide rod 300, and the transmission gear set 700 disengages from the bottom of the torsion disc body 201; Replace gear 1 (705) and gear 2 (706) with the required gear ratio. Slider 402 slides inside slide groove 401 to adapt to the gear ratio of gear 1 (705) and gear 2 (706). Then rotate U-shaped frame 503 in the opposite direction to move lower support frame 500, sliding frame 600 and upper support plate 400 upward until rotating shaft 1 (701) is inserted into connecting pipe 707 and rotating shaft 2 (702) is inserted into collar 407, thus completing the replacement of gear 1 (705) and gear 2 (706). The disc spring to be tested is placed on top of the torsion disc body 201 and the bearing ring 202. The arc-shaped push plate 203 and the arc-shaped baffle 204 are respectively snapped onto the two ends of the disc spring. The spotlight 207 shines on the indicator plate 205 and reads the initial scale on the angle scale 206 illuminated by the spotlight 207. The rotating arm 806 and the push column 807 are driven to rotate by the motor 805. The push column 807 first inserts into the straight groove 803, which pushes the drive disk 801 to rotate. Then the push column 807 disengages from the straight groove 803. During the process of the push column 807 sliding inside the straight groove 803, the sliding column 907 slides inside the outer arc groove 910. The left clamping plate 901 and the right clamping plate 902 remain in a state of mutual contact. Under the squeezing action of the left clamping plate 901 or the right clamping plate 902, the arc-shaped pressure plate 914 is squeezed on the circumferential surface of the friction wheel 916. Thus, when the drive disc 801 rotates, it drives the mounting cover 912 to rotate. In conjunction with the arc-shaped pressure plate 914 squeezing on the friction wheel 916, it drives the rotating shaft 702 and the fixed plate 906 to rotate. This drives the gear 705, the rotating shaft 701 and the torsion disc body 201 to rotate, causing the torsion disc body 201 to rotate relative to the bearing ring 202, causing the disc spring to torsion. After the pusher 807 separates from the straight groove 803, the friction plate 918 is pressed against the surface of the mounting cover 912 by the elasticity of the second spring 919, so as to prevent the drive disk 801 and the mounting cover 912 from continuing to rotate under the action of inertia. At the same time, the left clamping plate 901 and the right clamping plate 902 separate, and the arc-shaped pressure plate 914 moves outward under the elastic action of the spring 915 and separates from the friction wheel 916. As a result, the torsion disc body 201 rotates in the opposite direction and resets under the elastic action of the disc spring. The friction wheel 916 rotates relative to the mounting cover 912 to prevent the drive disc 801 from rotating with the rotating shaft 702. After the torsion disc body 201 is reset, the spotlight 207 illuminates a mark on the angle scale 206 again. By measuring the difference between the marks illuminated by the spotlight 207 on the angle scale 206 before and after the torsion disc body 201 rotates, it can be determined whether the disc spring is elastic enough to return to its initial state.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fatigue testing device for aircraft seat structural components, comprising a testing table (100), characterized in that: The top of the testing platform (100) is provided with a torsion disk assembly (200), and the disc spring in the aircraft seat is engaged with the top of the torsion disk assembly (200); Four sets of guide rods (300) are fixedly installed between the top and bottom walls of the testing platform (100). An upper support plate (400) and a lower support frame (500) are slidably connected on the guide rods (300). The upper support plate (400) is located on the upper side of the lower support frame (500). A sliding frame (600) is slidably connected between the upper support plate (400) and the lower support frame (500). The sliding frame (600) is provided with a rotation drive (800), and a transmission gear set (700) is provided between the rotation drive (800) and the torsion disc assembly (200).

2. The fatigue testing equipment for aircraft seat structural components according to claim 1, characterized in that: The torsion disc assembly (200) includes a torsion disc body (201) rotatably connected to the top of the testing platform (100). A bearing ring (202) is fixedly installed on the top of the testing platform (100). The bearing ring (202) is sleeved on the outside of the torsion disc body (201). An arc-shaped push plate (203) is fixedly installed at the top edge of the torsion disc body (201). An arc-shaped baffle (204) is fixedly installed on the top of the bearing ring (202). The arc-shaped push plate (203) and the arc-shaped baffle (204) are respectively engaged at both ends of the disc spring.

3. The fatigue testing equipment for aircraft seat structural components according to claim 2, characterized in that: An indicator plate (205) is fixedly installed on the top of the testing platform (100). The center of the arc of the indicator plate (205) coincides with the axis of the torsion disk body (201). An angle scale (206) is provided on the inner side of the indicator plate (205). A spotlight (207) is fixedly installed at the center of the torsion disk body (201). The spotlight (207) is arranged along the radial direction of the torsion disk body (201).

4. The fatigue testing equipment for aircraft seat structural components according to claim 2, characterized in that: A groove (401) is provided through the right half of the upper support plate (400). A slider (402) is slidably connected in the groove (401). An extension plate (403) is fixedly installed at the bottom right end of the slider (402). The extension plate (403) is attached to the bottom of the upper support plate (400). A vertical rod (404) is slidably connected through the right end of the extension plate (403). A connecting plate (405) is fixedly installed at the bottom end of the vertical rod (404). The connecting plate (405) is attached to the top wall of the testing table (100). A support frame (406) is fixedly installed at the left end of the connecting plate (405). A collar (407) is rotatably connected in the support frame (406). The support frame (406) is slidably connected to the top wall of the testing table (100).

5. The fatigue testing equipment for aircraft seat structural components according to claim 1, characterized in that: The bottom of the front and rear sides of the lower support frame (500) is fixedly installed with a fixing plate (501). An inclined groove (502) is opened through the fixing plate (501). A U-shaped frame (503) is slidably connected to the bottom wall of the testing table (100). A sliding column (504) is fixedly installed on one side of each end of the U-shaped frame (503). The sliding column (504) is slidably connected in the inclined groove (502). A threaded rod (505) is rotatably connected to the bottom wall of the testing table (100). The threaded rod (505) is threadedly connected to the U-shaped frame (503).

6. The fatigue testing equipment for aircraft seat structural components according to claim 1, characterized in that: The sliding frame (600) includes a base (601) slidably connected to the top of the lower support frame (500). L-shaped plates (602) are fixedly installed on the front and rear sides of the base (601). The two L-shaped plates (602) are slidably connected to the front and rear sides of the upper support plate (400). A threaded rod (603) is rotatably connected to the left end of the L-shaped plate (602). A lug (604) is fixedly installed on the lower surface of the left half of the upper support plate (400). The threaded rod (603) is threadedly connected to the lug (604).

7. The fatigue testing equipment for aircraft seat structural components according to claim 4, characterized in that: The transmission gear set (700) includes a first rotating shaft (701) that is rotatably connected through the center of the upper support plate (400), and a second rotating shaft (702) that is rotatably connected through the center of the slider (402). Supports (703) are fixedly installed on the circumferential surfaces of the first rotating shaft (701) and the second rotating shaft (702). The two supports (703) are respectively attached to the top of the upper support plate (400) and the top of the slider (402). A protrusion (704) is fixedly installed on the upper half of the circumferential surface of the first rotating shaft (701) and the second rotating shaft (702). The transmission gear set (700) also includes gear one (705) and gear two (706), gear one (705) and gear two (706) mesh with each other, a coupling tube (707) is fixedly installed at the center of the bottom of the torsion disc body (201), the rotating shaft one (701) is inserted into the center of gear one (705) and the inside of the coupling tube (707), the rotating shaft two (702) is inserted into the center of gear two (706) and the inside of the collar (407), the two brackets (703) are respectively attached to the bottom of gear one (705) and gear two (706), the coupling tube (707) is attached to the top of gear one (705), and the collar (407) is attached to the top of gear two (706).

8. The fatigue testing equipment for aircraft seat structural components according to claim 7, characterized in that: The rotating drive component (800) includes a drive disk (801) rotatably connected to the lower half of the rotating shaft (702). The drive disk (801) has an array of support arms (802) on its edge. An avoidance arc surface (804) is provided between two adjacent support arms (802). A straight groove (803) is provided through the middle of each support arm (802). A motor (805) is fixedly installed at the bottom of the base (601). A rotating arm (806) and a fan-shaped plate (808) are fixedly installed at the output end of the motor (805). A push column (807) is fixedly installed at the top of the end of the rotating arm (806) away from the motor (805). The push column (807) is slidably connected in the straight groove (803). The fan-shaped plate (808) is attached to the avoidance arc surface (804). A connecting component (900) is provided between the drive disk (801) and the second rotating shaft (702).

9. The fatigue testing equipment for aircraft seat structural components according to claim 8, characterized in that: Two guide rails (605) are fixedly installed on the bottom wall of the right half of the sliding frame (600). The connecting assembly (900) includes a left clamping plate (901) and a right clamping plate (902). The left clamping plate (901) and the right clamping plate (902) have semi-circular arc surfaces on opposite sides. Two pads (903) are fixedly installed at the bottom of the left clamping plate (901) and the right clamping plate (902). The pads (903) are slidably connected to the guide rail (605). A reverse transmission component is provided between the left clamping plate (901) and the right clamping plate (902). A mounting cover (912) is fixedly installed at the bottom center of the drive disk (801). U-shaped plates (913) are slidably connected in an array on the circumferential surface of the mounting cover (912). The U-shaped plate (913) is V-shaped at one end outside the mounting cover (912). An arc-shaped pressure plate (914) is fixedly installed at one end inside the mounting cover (912). A spring (915) is fixedly installed between the U-shaped plate (913) and the outer wall of the mounting cover (912). The mounting cover (912) is sleeved on the outer side of the bottom end of the rotating shaft (702). A friction wheel (916) is fixedly installed at the bottom end of the rotating shaft (702). The arc-shaped pressure plate (914) is attached to the circumferential surface of the friction wheel (916). The arc-shaped surfaces of the left clamping plate (901) and the right clamping plate (902) are attached to the V-shaped end of the U-shaped plate (913).

10. The fatigue testing equipment for aircraft seat structural components according to claim 9, characterized in that: The reverse transmission component includes two rack plates (904), which are fixedly installed on the pads (903) at the bottom of the left clamping plate (901) and the right clamping plate (902), respectively, and a gear three (905) meshes between the two rack plates (904). A fixing plate two (906) is fixedly installed on the left side of the left clamping plate (901). A sliding column two (907) is fixedly installed at the bottom left end of the fixing plate two (906). A turntable (908) is connected to the output end of the motor (805). The turntable (908) is located under the rotating arm (806). An inner arc groove (909) and an outer arc groove (910) are opened on the top of the turntable (908). The radius of the outer arc groove (910) is larger than the radius of the inner arc groove (909). The ends of the inner arc groove (909) and the outer arc groove (910) are connected by a connecting groove (911). The sliding column two (907) is slidably connected in the inner arc groove (909), the outer arc groove (910) and the connecting groove (911). A concave plate (917) is fixedly installed on each of the two rack plates (904). When the two rack plates (904) move in opposite directions, the two concave plates (917) move closer to the mounting cover (912). A friction plate (918) is slidably connected to the concave plate (917). A second spring (919) is fixedly installed between the friction plate (918) and the second spring (919). The second spring (919) is used to drive the friction plate (918) to move closer to the mounting cover (912).

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