A disc spring damping characteristic frequency testing device and method

Abstract

The application discloses a disc spring damping characteristic frequency testing device and method, and relates to the technical field of disc spring testing; the testing device comprises a positioning column and a fixing plate, the positioning column is internally provided with a positioning assembly, two abutting blocks are symmetrically installed at the top of a pressing plate, connecting wheels are abuttingly connected to the top of the two abutting blocks, a connecting hole is formed in the center of the connecting wheel, a mounting plate one is fixedly installed on the top of the fixing plate in a left-right symmetrical mode, a connecting column is rotatably connected to the left mounting plate one through a motor, and an adjusting assembly is arranged between the connecting hole and the connecting column; the positioning column positioning range is flexibly adjusted by driving the bidirectional screw rod to rotate, moving the sliding block, and synchronously moving the positioning rod, so that different inner diameter disc springs are adapted; the position of the connecting wheel relative to the connecting column is adjusted under the action of the abutting groove and the abutting strip through the transmission cooperation of the screw groove sleeve and the connecting rod, so that the excitation amplitude adjustment is realized; and the problems of poor universality and easy test deviation of the existing testing device are solved.

Description

Technical Field

[0001] This invention relates to the field of disc spring testing technology, specifically to a disc spring damping characteristic frequency testing device and method. Background Technology

[0002] A disc spring is a conical, disc-shaped elastic element characterized by high stiffness and strong shock absorption capacity. Disc spring damping characteristic frequency testing refers to the process of detecting the disc spring's ability to attenuate vibrations under dynamic alternating excitation force by changing the excitation frequency, thereby determining key parameters such as its critical damping frequency and fully damped frequency. Because different equipment operating conditions significantly vary the requirements for disc spring damping effects, applicable frequency ranges, and load-bearing characteristics, damping characteristic frequency testing is necessary to obtain the disc spring's damping response under different excitation conditions.

[0003] Traditional testing devices typically use guide posts of fixed diameter for centering disc springs. This structure is generally suitable for disc springs with a single inner diameter, and its versatility for disc springs with different inner diameters is poor. When the inner diameter of the disc spring to be tested is larger than the diameter of the guide post, a guide post of the corresponding diameter needs to be replaced, which is a cumbersome process. If the guide post is not replaced, there will be a large gap between the two, which can easily lead to eccentricity, tilting, and wobbling of the disc spring during clamping and excitation, resulting in distortion of the force measurement signal and large deviations in the test results. On the other hand, the eccentricity of the cam used in traditional testing devices is fixed and the excitation amplitude is not adjustable. When dealing with disc springs with different testing requirements, different specifications of cams need to be replaced to meet the testing requirements, which is a cumbersome and complicated operation. Especially when conducting multi-amplitude comparison tests on the same disc spring, it is necessary to stop the machine to disassemble and replace the cam, which reduces the testing efficiency. Moreover, it is not easy to ensure that the phase and relative position of the cam are completely consistent after each installation, which can lead to insufficient data stability and affect the accuracy and reliability of the frequency detection of the disc spring damping characteristics. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art by proposing a disc spring damping characteristic frequency testing device and method. It solves the problems of existing traditional testing devices using fixed diameter guide posts for positioning, which has poor versatility and is prone to test deviation. At the same time, the fixed cam eccentricity requires stopping the machine to replace the cam, which can reduce testing efficiency and affect data stability and detection accuracy.

[0005] This invention is achieved through the following technical solution: A disc spring damping characteristic frequency testing device includes a testing box. A force sensor is installed at the bottom of the testing box, and a positioning plate is installed at the top of the force sensor. A positioning column is fixedly installed at the top of the positioning plate. A positioning component is installed inside the positioning column for positioning the disc spring. A pressure plate and a fixing plate are slidably connected from bottom to top at the bottom of the testing box via multiple sliding rods. The bottom of the fixing plate is connected to the bottom of the testing box via hydraulic mechanisms on both sides. Two abutting blocks are symmetrically installed on the top of the pressure plate. A connecting wheel is connected to the top of each abutting block. A connecting hole is opened at the center of the connecting wheel. A symmetrical mounting plate is fixedly installed on the top of the fixing plate. The left mounting plate is rotatably connected to the connecting column via a motor. The connecting column is rotatably connected to the right mounting plate via a bearing. An adjustment component is provided between the connecting hole and the connecting column for adjusting the position of the connecting wheel.

[0006] Furthermore, the positioning assembly includes a bidirectional screw, which is rotatably mounted inside the positioning post via two symmetrical bearings. The bottom end of the bidirectional screw is rotatably connected to the inside of the positioning plate via a motor. The outer thread of the bidirectional screw has two symmetrical sliders, which are slidably connected to corresponding grooves inside the positioning post by protrusions. Multiple positioning rods are slidably connected to the outer sides of the two sliders, and these positioning rods are slidably connected to multiple slots on the outer side of the positioning post. A connecting block is provided on the inner side of the positioning rod, and a connecting groove is provided inside the positioning post. The connecting block on the inner side of the positioning rod and the connecting groove inside the positioning post are connected by a spring.

[0007] Furthermore, the outer side of the slider has a conical structure, and the upper and lower sides of the positioning rod are both inclined surfaces, which correspond to the conical structure of the slider.

[0008] Furthermore, the top of the contact block is arc-shaped, which is used to abut against the connecting wheel; the top of the pressure plate has a movable hole for the sliding of the positioning post and the positioning rod.

[0009] Furthermore, the adjusting component includes a screw sleeve, which is rotatably connected to the right side of the connecting column via a bearing. A connecting rod is slidably arranged inside the screw sleeve, and a push plate is fixedly connected to the left end of the connecting rod. The push plate is limited to slide in a square groove inside the connecting column. Two abutting grooves are opened on both the upper and lower sides of the push plate. Abutting strips are abutting the inner walls of the four abutting grooves. The abutting strips are slidably connected in the through hole inside the connecting column. The outer ends of the two symmetrical abutting strips are fixedly installed on the inner wall of the connecting hole.

[0010] Furthermore, a second mounting plate is fixed to the top right of the fixed plate, and a conductive slip ring is fixedly connected inside the round hole of the second mounting plate. A connecting sleeve is fixed to the right side of the connecting column. The connecting sleeve is rotatably connected to the screw groove sleeve through the motor output end, and the connecting sleeve is connected to the rotor end of the conductive slip ring through the motor stator end.

[0011] Furthermore, the contact groove is designed as a sloping structure, and the end of the contact strip that matches the sloping structure of the contact groove forms an arc-shaped contact surface. The symmetrically opened upper and lower sloping surfaces of the contact groove are parallel to each other.

[0012] Furthermore, a convex ball is installed on the outside of the connecting rod. The convex ball slides in conjunction with the helical groove opened inside the screw sleeve. The convex ball is used to convert the rotational motion of the screw sleeve into the linear motion of the connecting rod.

[0013] Furthermore, the connecting hole is oblong, and it slides into the vertical groove on the outer side of the connecting post.

[0014] A method for testing the frequency characteristics of a disc spring damping characteristic, using the aforementioned disc spring damping characteristic frequency testing device, includes the following steps: S1. Start the positioning component. The positioning component moves radially outward along the positioning column to change the positioning range of the positioning column and adapt to disc springs with different inner diameters. S2. Start the hydraulic mechanism to move the fixed plate and pressure plate downward. The pressure plate passes through the positioning column and presses the disc spring so that the disc spring reaches the required preload stiffness for the test. S3. Start the adjustment component and adjust the eccentric position of the connecting wheel to adjust the excitation amplitude. S4. By rotating the connecting column and connecting wheel, the rotating connecting wheel drives the pressure plate to reciprocate and excite the disc spring. The force sensor collects the pressure signal, and the system determines the damping characteristic frequency based on the signal critical point to complete the test.

[0015] The beneficial effects of this invention compared to the prior art are as follows: 1. This invention, by setting up a positioning component, uses a motor to drive a bidirectional screw to rotate during the positioning stage, causing the upper and lower sliders to move towards or away from each other. This enables multiple positioning rods to expand outward or contract inward synchronously, thereby flexibly adjusting the effective positioning range of the positioning posts to adapt to disc springs with different inner diameters. The disc springs are always constrained at the center of the positioning posts, preventing eccentricity, tilting, or displacement of the disc springs during the positioning process. This ensures that the disc springs are subjected to uniform and symmetrical force during testing, improving the device's adaptability and versatility to disc springs of different specifications.

[0016] 2. This invention, by setting an adjustment component, converts the rotational motion of the screw sleeve into the linear motion of the connecting rod through the transmission cooperation between the internal spiral groove of the screw sleeve and the external convex ball of the connecting rod. This pushes the push plate to move horizontally and uses the abutment groove to drive the abutment strip to move up and down, thereby driving the connecting wheel to adjust its position relative to the connecting column. This achieves the adjustment of the excitation eccentricity distance and excitation amplitude. The entire adjustment process can be completed online without stopping the machine to replace the cam or other components, simplifying the testing, switching and debugging process of disc springs for different testing needs. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the testing box of the present invention; Figure 3 This is a schematic diagram showing the disassembled structure of the force sensor, positioning plate, and pressure plate of the present invention; Figure 4 This is a schematic diagram of the disassembled structure of the positioning plate and positioning post of the present invention; Figure 5 This is a schematic diagram of the positioning post and positioning assembly structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the positioning column of the present invention; Figure 7 For the present invention Figure 6 Enlarged detail diagram at point A in the middle; Figure 8 This is a schematic diagram of the positioning component structure of the present invention; Figure 9 This is a schematic diagram of the top structure of the fixing plate of the present invention; Figure 10 This is a schematic diagram of the connecting column and adjusting assembly structure of the present invention; Figure 11 This is a schematic diagram of the disassembled structure of the screw groove sleeve, push plate, and connecting wheel of the present invention; Figure 12 This is a schematic diagram of the connecting wheel, connecting column, mounting plate one, mounting plate two, and conductive slip ring of the present invention.

[0018] Figure label: 1. Detection box; 2. Force sensor; 3. Positioning plate; 4. Positioning post; 5. Positioning assembly; 51. Bidirectional screw; 52. Slider; 53. Positioning rod; 6. Pressure plate; 61. Movable hole; 7. Fixing plate; 8. Abutment block; 9. Connecting wheel; 91. Connecting hole; 10. Mounting plate one; 101. Connecting sleeve; 11. Connecting post; 12. Adjustment assembly; 121. Screw groove sleeve; 122. Connecting rod; 123. Push plate; 124. Abutment groove; 125. Abutment strip; 13. Mounting plate two; 14. Conductive slip ring. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0020] Please see Figures 1 to 12This embodiment proposes a disc spring damping characteristic frequency testing device, including a testing box 1. A mounting groove is provided at the bottom of the testing box 1, and a force sensor 2 is installed in the mounting groove. A positioning plate 3 is installed at the top of the force sensor 2, and a positioning post 4 is fixedly installed at the top of the positioning plate 3. A positioning component 5 is provided inside the positioning post 4 for positioning the disc spring. A pressure plate 6 and a fixing plate 7 are slidably connected from bottom to top at the bottom of the testing box 1 via multiple sliding rods. The bottom of the fixing plate 7 is connected to the bottom of the testing box 1 via hydraulic mechanisms on both sides. Two abutting blocks 8 are symmetrically installed on the top of the pressure plate 6, and the tops of the two abutting blocks 8 abut against each other. A connecting wheel 9 is connected, and a connecting hole 91 is opened at the center of the connecting wheel 9. A symmetrical mounting plate 10 is fixedly installed on the top of the fixing plate 7. The mounting plate 10 on the left side is connected to the connecting column 11 by a motor. The connecting column 11 is rotatably connected to the mounting plate 10 on the right side by a bearing. An adjustment component 12 is provided between the connecting hole 91 and the connecting column 11. The adjustment component 12 is used to adjust the position of the connecting wheel 9. The disc spring to be tested is sleeved on the outside of the positioning column 4. The fixing plate 7 is driven to move downward by the hydraulic mechanism. The downward movement of the fixing plate 7 drives the pressure plate 6 to move downward. The downward movement of the pressure plate 6 presses the disc spring, giving the disc spring a certain rigidity.

[0021] The positioning assembly 5 includes a bidirectional screw 51, which is rotatably mounted inside the positioning post 4 via two symmetrical bearings. The bottom end of the bidirectional screw 51 is rotatably connected to the positioning plate 3 via a motor. Two symmetrical sliders 52 are screwed onto the outside of the bidirectional screw 51. The two sliders 52 are slidably connected to corresponding grooves inside the positioning post 4 via protrusions. Multiple positioning rods 53 are slidably connected to the outside of each slider 52, and these positioning rods 53 are slidably connected to multiple slots on the outside of the positioning post 4. A connecting block is provided on the inner side of the positioning rod 53, and a connecting groove is provided inside the positioning post 4. The connecting block on the inner side of the positioning rod 53 is connected to the connecting groove inside the positioning post 4 via a spring. During the positioning operation, the motor at the bottom end of the bidirectional screw 51 is first started. The motor output drives the bidirectional screw 51 to rotate, and the bidirectional screw 51 rotates stably under the support of the two symmetrical bearings. As the bidirectional screw 51 rotates, the sliders 52, symmetrically arranged on the outer side of the bidirectional screw 51, move closer or further apart along the axial direction of the bidirectional screw 51 through the cooperation of the protrusions with the corresponding grooves inside the positioning post 4. When two sliders 52 move closer together, the sides of the sliders 52 will press against multiple positioning rods 53 to overcome the spring force and push the positioning rods 53 outward along the strip hole on the outer side of the positioning post 4, thereby expanding the effective positioning range of the positioning post 4. When two sliders 52 move further apart, the pressing effect of the sliders 52 on the positioning rods 53 decreases. Under the reset action of the spring, the positioning rods 53 retract inward, thereby reducing the effective positioning range of the positioning post 4. This allows for flexible adjustment of the positioning range of the positioning post 4 to accommodate disc springs of different inner diameters, ensuring that the disc spring is always in the center position during the positioning process, preventing eccentricity during disc spring positioning, and achieving positioning of disc springs of different sizes.

[0022] The outer side of the slider 52 is designed as a conical structure, and the upper and lower sides of the positioning rod 53 are both inclined structures. The inclined structure corresponds to the conical structure of the slider 52. The inclined structure of the positioning rod 53 is used to achieve contact sliding with the conical structure of the slider 52, which reduces the frictional resistance between the slider 52 and the positioning rod 53 during the relative sliding process, making the transmission smoother.

[0023] The top of the contact block 8 is designed to be arc-shaped. The arc shape at the top of the contact block 8 is used to make contact with the connecting wheel 9. The arc-shaped design at the top of the contact block 8 makes it easier to fit better with the outer surface of the connecting wheel 9 and reduces the contact stress between the two.

[0024] The top of the pressure plate 6 has a movable hole 61, which is used for the sliding of the positioning pin 4 and the positioning rod 53. During the pressing process, the positioning pin 4 and the positioning rod 53 slide through the movable hole 61 to prevent the disc spring from becoming eccentric or shifting during the pressing process.

[0025] Adjustment component 12 includes a threaded sleeve 121, which is rotatably connected to the right side of the connecting column 11 via a bearing. A connecting rod 122 is slidably disposed inside the threaded sleeve 121. A push plate 123 is fixedly connected to the left end of the connecting rod 122. The push plate 123 slides within a square groove inside the connecting column 11. Two abutment grooves 124 are provided on both the upper and lower sides of the push plate 123. Abutment strips 125 are abutted to the inner walls of the four abutment grooves 124. The abutment strips 125 are slidably connected to the through holes inside the connecting column 11. The outer ends of two symmetrical abutment strips 125 are fixedly installed on the inner wall of the connecting hole 91. During disc spring damping characteristic testing, the connecting column 11 is rotated by a motor, and the connecting column 11 drives the connecting wheel 9 synchronously. During rotation, the connecting wheel 9 transmits vibration to the disc spring under test through the contact block 8, causing the disc spring to generate a corresponding vibration response. At the same time, in order to adapt to disc springs with different testing requirements, the connecting rod 122 is moved by the rotation of the screw sleeve 121. The movement of the connecting rod 122 drives the push plate 123 to move synchronously. During the movement of the push plate 123, the contact grooves 124 on its upper and lower sides will slide relative to the contact strip 125, pushing the contact strip 125 to slide vertically along the through hole on the inner side of the connecting column 11, thereby driving the connecting wheel 9 to move vertically, so as to change the eccentric position of the connecting wheel 9. By adjusting the eccentric position of the connecting wheel 9, it is easy to meet the testing requirements of different disc springs, improving the versatility and adaptability of the device.

[0026] Mounting plate 2 13 is fixed to the top right of the fixing plate 7. A conductive slip ring 14 is fixedly connected in the round hole of mounting plate 2 13. A connecting sleeve 101 is fixed to the right side of the connecting column 11. The connecting sleeve 101 is rotatably connected to the screw groove sleeve 121 through the motor output end. The connecting sleeve 101 is connected to the rotor end of the conductive slip ring 14 through the stator end of the motor. Under the action of the conductive slip ring 14, it is ensured that the power cord will not be tangled or broken when the screw groove sleeve 121 is rotated and adjusted for multiple turns, and a stable power support is continuously provided to the motor in the connecting sleeve 101.

[0027] The abutment groove 124 is designed as an inclined structure. The end of the abutment strip 125 that cooperates with the inclined structure of the abutment groove 124 forms an arc-shaped contact surface. The inclined surfaces of the abutment groove 124, which are symmetrically opened at the top and bottom, are designed to be parallel to each other. This design makes it easier for the abutment strip 125 to be evenly stressed during movement, reduces the deviation of the connecting wheel 9 during vertical movement, and enhances the structural stability.

[0028] A convex ball is installed on the outside of the connecting rod 122. The convex ball slides in conjunction with the spiral groove inside the screw sleeve 121. The convex ball is used to convert the rotational motion of the screw sleeve 121 into the linear motion of the connecting rod 122. When the screw sleeve 121 rotates, the spiral groove inside it rotates relative to the connecting rod 122. As the spiral groove rotates, the groove wall of the spiral groove generates a lateral thrust on the convex ball. Under the sliding contact between the convex ball and the spiral groove, the rotational torque of the screw sleeve 121 is converted into a linear thrust along the axial direction of the connecting rod 122, thereby driving the connecting rod 122 to move the push plate 123 smoothly.

[0029] The connecting hole 91 is designed as an elongated oval. The connecting hole 91 slides into the vertical groove on the outer side of the connecting post 11. When the connecting wheel 9 moves downward, the vertical groove of the connecting post 11 restricts the rotational freedom of the connecting wheel 9, ensuring that the connecting wheel 9 moves only in the vertical direction.

[0030] As one embodiment of the present invention, the method includes the following steps: S1: Start the motor at the bottom of the bidirectional screw 51, which drives the slider 52 to move through the bidirectional screw 51, and adjusts the positioning rod 53 to move outward to change the positioning range of the positioning post 4, adapting to disc springs with different inner diameters. S2: Start the hydraulic mechanism to move the fixed plate 7 and the pressure plate 6 downward. The movable hole 61 of the pressure plate 6 passes through the positioning column 4 and presses the disc spring so that the disc spring reaches the pre-tightening stiffness required for the test. S3: The screw sleeve 121 is driven to rotate by the motor. The screw sleeve 121 and the connecting rod 122 are engaged by the spiral groove of the screw sleeve 121 and the convex ball of the connecting rod 122 to drive the push plate 123 to move. Under the action of the contact groove 124 and the contact bar 125, the eccentric position of the connecting wheel 9 is adjusted to achieve the adjustment of the vibration amplitude. S4: The motor drives the connecting column 11 and the connecting wheel 9 to rotate. The rotation of the connecting wheel 9 drives the pressure plate 6 to reciprocate and excite the disc spring. The force sensor 2 collects the pressure signal. The system determines the damping characteristic frequency based on the signal critical point to complete the test.

[0031] The working principle of the disc spring damping characteristic frequency testing device provided by this invention is as follows: During operation, the motor in the positioning assembly 5 is started, and the motor output drives the bidirectional screw 51 to rotate. The rotation of the bidirectional screw 51 drives the upper and lower sliders 52 to move closer to each other axially. At this time, the conical structure of the slider 52 presses against the inclined structure of the positioning rod 53 to overcome the spring force and push the multiple positioning rods 53 to slide outward along the strip-shaped hole on the outside of the positioning post 4. At this time, the positioning rods 53 expand outward, thereby expanding the effective positioning range of the positioning post 4. When it is necessary to reduce the effective positioning range of the positioning post 4, the bidirectional screw 51 is rotated in the opposite direction. At this time, the two sliders 52 move away from each other, and the pressing effect of the sliders 52 on the positioning rods 53 decreases. Under the reset action of the spring, the positioning rods 53 contract inward, thereby reducing the effective positioning range of the positioning post 4. The effective positioning range of the positioning post 4 allows for flexible adjustment of its positioning range to accommodate disc springs with different inner diameters. This ensures that the disc spring remains centered during positioning, preventing eccentricity and enabling the positioning of disc springs of different sizes. After adjustment, the disc spring to be tested is placed on the outside of the positioning post 4. The hydraulic mechanism at the bottom of the testing box 1 is activated, causing the fixing plate 7 to move downwards along the slide rod. The fixing plate 7 then moves the pressure plate 6 downwards synchronously. During the descent, the movable hole 61 at the top of the pressure plate 6 allows the positioning post 4 and the positioning rod 53 to pass through, avoiding interference. As the pressure plate 6 continues to move downwards, it applies axial clamping force to the disc spring, bringing it to the pre-tensioned stiffness required for testing.

[0032] The motor drives the screw sleeve 121 to rotate. Through the cooperation between the internal spiral groove of the screw sleeve 121 and the outer convex ball of the connecting rod 122, the rotational motion of the screw sleeve 121 is converted into the axial linear motion of the connecting rod 122. The connecting rod 122 pushes the push plate 123 to move horizontally in the square groove inside the connecting column 11. The abutment grooves 124 on the upper and lower sides of the push plate 123 press the abutment strip 125, causing the abutment strip 125 to move vertically. The abutment strip 125 drives the connecting wheel 9 to move up and down, thereby changing the eccentric distance of the connecting wheel 9 relative to the connecting column 11. This facilitates stepless adjustment of the excitation amplitude according to the testing requirements of the disc spring. After the adjustment is completed, the motor on the mounting plate 10 on the left side is started, which drives the connecting column 11 to rotate. The connecting column 11 drives the connecting wheel 9 to rotate. The rotating connecting wheel 9 continuously abuts against the abutment block 8 on the pressure plate 6 through its outer surface, converting the rotational motion into pressure plate motion. The vertical reciprocating vibration motion of the pressure plate 6 transmits the dynamic excitation force to the disc spring below. Under the action of preload and alternating load, the disc spring generates a damping response. The motor speed is continuously adjustable, realizing a continuous distribution of excitation frequency from low to high, covering the test range of disc spring damping characteristics. The force sensor 2 at the bottom collects the force value change signal in real time. As the excitation frequency gradually increases, the damping effect of the disc spring changes continuously, and the pressure fluctuation amplitude collected by the sensor changes accordingly. The system determines the damping characteristic frequency of the disc spring based on the critical point from fluctuation to stability of the pressure signal, thereby completing the test of the disc spring damping characteristics and frequency response. If it is necessary to carry out multi-amplitude comparison test on the same disc spring, the position of the connecting wheel 9 relative to the connecting column 11 can be adjusted directly through the adjustment component 12 during the test. The entire adjustment process can be completed online without stopping the machine to replace the cam or other components, simplifying the test switching and debugging process.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A disc spring damping characteristic frequency testing device, comprising a testing box (1), a force sensor (2) installed at the bottom of the testing box (1), a positioning plate (3) installed at the top of the force sensor (2), and a positioning column (4) fixedly installed at the top of the positioning plate (3); characterized in that, The positioning column (4) is equipped with a positioning component (5), which is used for positioning the disc spring. The bottom of the test box (1) is connected to the pressure plate (6) and the fixing plate (7) by multiple sliding rods from bottom to top. The bottom of the fixing plate (7) is connected to the bottom of the test box (1) by hydraulic mechanisms on both sides. The top of the pressure plate (6) is symmetrically equipped with two abutting blocks (8). The tops of the two abutting blocks (8) are connected to the connecting wheel (9). The center of the connecting wheel (9) is provided with a connecting hole (91). The top of the fixing plate (7) is fixedly equipped with a symmetrical mounting plate (10). The mounting plate (10) on the left is connected to the connecting column (11) by a motor. The connecting column (11) is rotatably connected to the mounting plate (10) on the right by a bearing. An adjustment component (12) is provided between the connecting hole (91) and the connecting column (11). The adjustment component (12) is used to adjust the position of the connecting wheel (9).

2. The disc spring damping characteristic frequency testing device according to claim 1, characterized in that, The positioning component (5) includes a bidirectional screw (51), which is rotatably installed inside the positioning post (4) through two symmetrical bearings. The bottom end of the bidirectional screw (51) is rotatably connected to the positioning plate (3) through a motor. Two symmetrical sliders (52) are screwed to the outside of the bidirectional screw (51). The two sliders (52) are slidably connected to the corresponding grooves inside the positioning post (4) through a protrusion limit. Multiple positioning rods (53) are slidably connected to the outside of the two sliders (52). The multiple positioning rods (53) are slidably connected to multiple slots on the outside of the positioning post (4). A connecting block is provided on the inside of the positioning rod (53). A connecting groove is provided inside the positioning post (4). The connecting block on the inside of the positioning rod (53) is connected to the connecting groove inside the positioning post (4) through a spring.

3. The disc spring damping characteristic frequency testing device according to claim 2, characterized in that, The outer side of the slider (52) is a conical structure, and the upper and lower sides of the positioning rod (53) are both inclined structures, which correspond to the conical structure of the slider (52).

4. The disc spring damping characteristic frequency testing device according to claim 2, characterized in that, The top of the abutment block (8) is arc-shaped, and the arc shape of the top of the abutment block (8) is used to abut against the connecting wheel (9); the top of the pressure plate (6) is provided with a movable hole (61), and the movable hole (61) is used for the sliding of the positioning post (4) and the positioning rod (53).

5. The disc spring damping characteristic frequency testing device according to claim 1, characterized in that, The adjusting assembly (12) includes a screw sleeve (121), which is rotatably connected to the right side of the connecting column (11) via a bearing. A connecting rod (122) is slidably arranged inside the screw sleeve (121). A push plate (123) is fixedly connected to the left end of the connecting rod (122). The push plate (123) is limited to slide in a square groove inside the connecting column (11). Two abutting grooves (124) are opened on both the upper and lower sides of the push plate (123). Abutting strips (125) are abutted to the inner walls of the four abutting grooves (124). The abutting strips (125) are slidably connected to the through hole inside the connecting column (11). The outer ends of the two abutting strips (125) that are symmetrically arranged are fixedly installed on the inner wall of the connecting hole (91).

6. The disc spring damping characteristic frequency testing device according to claim 5, characterized in that, Mounting plate 2 (13) is fixed on the right side of the top of the fixing plate (7). A conductive slip ring (14) is fixedly connected in the round hole of mounting plate 2 (13). A connecting sleeve (101) is fixed on the right side of the connecting column (11). The connecting sleeve (101) is rotatably connected to the screw groove sleeve (121) through the motor output end. The connecting sleeve (101) is connected to the rotor end of the conductive slip ring (14) through the stator end of the motor.

7. The disc spring damping characteristic frequency testing device according to claim 5, characterized in that, The abutment groove (124) is set as an inclined structure. The end of the abutment strip (125) that cooperates with the inclined structure of the abutment groove (124) forms an arc-shaped contact surface. The inclined surfaces of the abutment groove (124) that are symmetrically opened at the top and bottom are parallel to each other.

8. The disc spring damping characteristic frequency testing device according to claim 5, characterized in that, A convex ball is installed on the outside of the connecting rod (122). The convex ball slides in conjunction with the spiral groove opened inside the screw sleeve (121). The convex ball is used to convert the rotational motion of the screw sleeve (121) into the linear motion of the connecting rod (122).

9. The disc spring damping characteristic frequency testing device according to claim 5, characterized in that, The connecting hole (91) is an elongated oval shape, and the connecting hole (91) slides with the outer vertical groove of the connecting post (11).

10. A method for testing the frequency of disc spring damping characteristics, characterized in that, The disc spring damping characteristic frequency testing device as described in any one of claims 1-9 is adopted, and includes the following steps: S1. Start the positioning component (5). Move the positioning component (5) radially outward along the positioning column (4) to change the positioning range of the positioning column (4) and adapt to disc springs with different inner diameters. S2. Start the hydraulic mechanism to drive the fixed plate (7) and pressure plate (6) to move down. The pressure plate (6) passes through the positioning column (4) and presses the disc spring so that the disc spring reaches the required pre-tightening stiffness for testing. S3. Start the adjustment component (12) and adjust the eccentric position of the connecting wheel (9) through the adjustment component (12) to achieve the adjustment of the excitation amplitude; S4. The connecting column (11) and connecting wheel (9) rotate, and the rotating connecting wheel (9) drives the pressure plate (6) to reciprocate and excite the disc spring. The force sensor (2) collects the pressure signal. The system determines the damping characteristic frequency according to the signal critical point to complete the test.

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