Rigidity measuring system and method for seat spring type variable force spring hanging device

Abstract

The invention relates to the technical field of spring stiffness measurement, and discloses a stiffness measurement system and method for a seat spring type variable force spring hanging device, and the system comprises a measurement assembly and a controller. The measuring assembly comprises a supporting assembly and two loading assemblies. The bottom end of the supporting assembly is connected with the top of the seat spring type variable force spring hanging device. The two loading assemblies are arranged at the bottom end of the supporting assembly, and the driving ends of the two loading assemblies abut against the two sides of the top of the seat spring type variable force spring hanging device. A measuring caliper is arranged on the supporting assembly; a strain measuring sheet is arranged on the seat spring type variable force spring hanging device; and the two groups of loading assemblies and the strain measuring sheet are respectively connected with the controller. Through the arrangement of the two loading assemblies, pressure can be accurately applied to the two sides of the top of the seat spring type variable-force spring hanging device. The double-side loading mode is beneficial to simulation of a more real stress environment, so that the accuracy of rigidity measurement is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of spring stiffness measurement, and specifically to a stiffness measurement system and method for a sitting spring type variable force spring hanging device. Background Art

[0002] The variable force spring hanging device is a common pipeline hanging device. During the operation of the pipeline system, since the variable force spring hanging device relies on the internal spring to work, when the spring performance deteriorates, the pipeline stress at its hanging point may exceed the allowable stress of the pipe material, resulting in phenomena such as pipeline cracking and deformation, or abnormal conditions, and it cannot reach the designed working condition of the normal pipeline operation, affecting the operation of the entire pipeline system; in extreme cases, it may even damage the pipeline and components, causing huge economic losses or safety threats.

[0003] Currently, for the spring performance of the variable force spring hanging device, the performance deterioration is mostly judged by comparing the cold and hot state working conditions, that is, observing the cold and hot state heights of the spring pressing plate and comparing them based on the thermal displacement to evaluate its performance. However, this judgment method is relatively rough, there is no accurate numerical comparison, and it is only applicable to the hanging points with large changes in cold and hot state working conditions, and can only be used when the deterioration has already occurred. Summary of the Invention

[0004] In order to overcome the defects existing in the above-mentioned prior art, the purpose of the present invention is to provide a stiffness measurement system and method for a sitting spring type variable force spring hanging device to solve the technical problem of low accuracy in measuring the spring performance of the variable force spring hanging device in the prior art.

[0005] The present invention is realized through the following technical solutions: In a first aspect, the present invention provides a stiffness measurement system for a sitting spring type variable force spring hanging device, including a measurement component and a controller; The measurement component includes a support component and two groups of loading components. The bottom end of the support component is connected to the top of the sitting spring type variable force spring hanging device; the two groups of loading components are respectively arranged at the bottom end of the support component, and the driving ends of the two groups of loading components respectively abut against both sides of the top of the sitting spring type variable force spring hanging device for applying pressure to the sitting spring type variable force spring hanging device; A measurement caliper is provided on the support component for measuring the lifting displacement of the support component; A strain measurement sheet is provided on the sitting spring type variable force spring hanging device for measuring the pressure data applied by the two groups of loading components to the sitting spring type variable force spring hanging device; The two groups of loading components and the strain measurement sheet are respectively connected to the controller.

[0006] Preferably, the support assembly includes a load-bearing steel frame; the load-bearing steel frame includes an upper top plate and a lower bottom plate; the center lines of the upper top plate and the lower bottom plate are connected by a connecting plate along the long side direction of the plate body to form an I-shaped steel structure; The tops of the two sets of loading assemblies are respectively arranged on both sides of the lower bottom plate; a connecting sleeve is fixedly arranged at the center position of the lower bottom plate, and is connected to the top of the seat spring type variable force spring suspension device through the connecting sleeve; The measuring caliper is arranged perpendicular to the load-bearing steel frame, and the measuring caliper is assembled on the lower bottom plate.

[0007] Furthermore, a plurality of reinforcing rib plates are arranged side by side and vertically between the upper top plate and the lower bottom plate.

[0008] Furthermore, a level is arranged on the upper top plate.

[0009] Furthermore, the seat spring type variable force spring suspension device includes a sleeve, a seat spring type variable force spring and a suspension rod; The sleeve is sleeved outside the seat spring type variable force spring, the driving ends of the two sets of loading assemblies penetrate into the sleeve and abut against the top of the seat spring type variable force spring, the suspension rod is arranged through the vertical central axis of the seat spring type variable force spring, one end of the suspension rod passes through the top of the sleeve and is connected to the connecting sleeve through a bolt, and the strain measuring sheet is arranged at the other end of the suspension rod.

[0010] Even further, the suspension rod and the connecting sleeve are coaxially arranged.

[0011] Preferably, the bottom surface of the support assembly is parallel to the top surface of the seat spring type variable force spring suspension device.

[0012] Preferably, a control module is arranged in the controller, the input end of the control module is connected to the output end of the signal input module, and the input end of the signal input module is connected to the strain measuring sheet; the output end of the control module is connected to the input end of the signal output module, the output end of the signal output module is connected to the processor, the human-computer interaction module and the driving module, and the output end of the driving module is connected to the two sets of loading assemblies.

[0013] In a second aspect, the present invention also provides a method for measuring the stiffness of a seat spring type variable force spring suspension device, based on the above-mentioned stiffness measurement system of a seat spring type variable force spring suspension device, which is characterized in that it includes the following processes: Connect the seat spring type variable force spring suspension device to the bottom of the support assembly, and perform a zero initial strain operation on the strain measuring sheet on the seat spring type variable force spring suspension device; The controller starts the two sets of loading assemblies, compresses the height of the seat spring type variable force spring suspension device by loading, the controller monitors the real-time strain of the spring suspension device in real time, and records the lifting displacement according to the measuring caliper; The controller manipulates two groups of loading components to repeatedly load and compress the height of the seat spring type variable force spring suspension device, and records multiple groups of strain-displacement data; Process and calculate multiple groups of strain-displacement data to obtain the stiffness of the seat spring type variable force spring suspension device.

[0014] Preferably, in the step of processing and calculating multiple groups of strain-displacement data to obtain the stiffness of the seat spring type variable force spring suspension device, the calculation formula for stiffness is as follows:

[0015] Wherein, R is the spring stiffness, i is the data number, F is the load output by the strain measuring device, h is the displacement output by the stiffness measuring device, and g is the acceleration due to gravity.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a stiffness measurement system for a seat spring type variable force spring suspension device. By setting two groups of loading components, it can accurately apply pressure to both sides of the top of the seat spring type variable force spring suspension device. This bilateral loading method helps to simulate a more realistic stress environment, thereby improving the accuracy of stiffness measurement. At the same time, the use of strain gauges can obtain the pressure data borne by the device during the loading process in real time and accurately, further enhancing the measurement accuracy. The two groups of loading components and the strain gauges are both connected to the controller, which means that the system can collect and process data in real time. The controller can quickly analyze the pressure applied by the loading components and the strain situation of the seat spring type variable force spring suspension device, so as to realize the real-time monitoring and evaluation of the device stiffness. This real-time feedback mechanism helps to detect and solve potential problems in a timely manner, improving the measurement efficiency and safety.

[0017] Furthermore, the bearing steel frame adopts an I-shaped steel structure formed by an upper top plate, a lower bottom plate and a connecting plate, which not only improves the overall structural bearing capacity, but also enhances its torsional and bending resistance. The I-shaped steel structure disperses stress, enabling the support components to remain stable when facing large pressures, thus ensuring the accuracy of the measurement results. A connecting sleeve is fixedly arranged at the center position of the lower bottom plate for connecting with the top of the seat spring type variable force spring suspension device, ensuring the accuracy and stability of the connection point, and reducing measurement errors caused by insecure connection or deviation. The tops of the two groups of loading components are respectively arranged on both sides of the lower bottom plate. This layout helps to simulate more uniform loading conditions and reduce measurement deviations caused by uneven loading. At the same time, it is also convenient for operators to monitor and adjust the loading process.

[0018] Furthermore, the reinforcing ribs enhance the overall structural strength of the support assembly. These ribs, like the support columns of a bridge, share and transfer the pressure from the loading assembly, making the entire structure more stable. This helps prevent structural deformation or damage caused by excessive pressure during the measurement process.

[0019] Furthermore, the level can detect the horizontal state of the upper top plate in real time, ensuring that the support assembly remains horizontal during the measurement process, reducing measurement errors caused by the inclination or unevenness of the support assembly, and thus improving the accuracy of stiffness measurement.

[0020] Furthermore, the seat spring type variable force spring is tightly wrapped by the sleeve, which not only protects the spring from the direct influence of the external environment but also ensures the compactness of the structure. At the same time, the suspension rod is disposed through the vertical central axis of the spring and is connected to the connecting sleeve by bolts. This layout enables the entire hanging device to maintain high stability and efficiency when stressed. The strain gauge is arranged at the other end of the suspension rod and can directly measure the strain of the suspension rod during the stress process. Since the suspension rod is tightly connected to the seat spring type variable force spring, the data reflected by the strain gauge can accurately reflect the stress state of the spring. This design helps to achieve accurate measurement and instant feedback, providing reliable data support for stiffness analysis.

[0021] Furthermore, the suspension rod and the connecting sleeve are coaxially arranged. The coaxial arrangement ensures the precise alignment between the suspension rod and the connecting sleeve, reducing the structural instability factors caused by offset or inclination. This design enables the entire hanging device to distribute the load more evenly when stressed, reducing the risk of local stress concentration, and thus improving the stability of the overall structure.

[0022] Further, the bottom surface of the support assembly is parallel to the top surface of the seat spring type variable force spring hanging device. The parallel arrangement ensures that the contact surface between the support assembly and the hanging device is flat and evenly stressed. This helps reduce measurement errors caused by uneven contact surfaces or uneven stress, and thus improves the accuracy of stiffness measurement. When the bottom surface of the support assembly is parallel to the top surface of the hanging device, the pressure applied by the loading assembly can be transferred to the seat spring type variable force spring more directly and efficiently. This optimization of the force transmission path reduces energy loss and frictional resistance, making the measurement data more real and reliable.

[0023] Furthermore, the controller integrates key components such as a control module, a signal input module, and a signal output module, achieving centralized control and automated management of the entire measurement system. This highly integrated design simplifies the system structure, improves the operating efficiency, and reduces the maintenance cost. The strain measurement chip transmits the measured data to the signal input module in real time, and the control module processes and analyzes these data. Subsequently, through the signal output module, the processed data is transmitted to the processor, the human-machine interaction module, and the drive module. This real-time data processing and feedback mechanism ensures the timeliness and accuracy of the measurement process.

[0024] The present invention also provides a method for measuring the stiffness of a seat spring type variable force spring hanging device. By using the controller to monitor the real-time strain of the spring hanging device in real time and combining with a measuring caliper to record the lifting displacement, strain-displacement data can be accurately obtained. This high-precision data acquisition method helps to reduce measurement errors and improve the accuracy of stiffness measurement. In the method of the present invention, it is required to repeatedly load and compress the seat spring type variable force spring hanging device and record multiple groups of strain-displacement data. By processing and calculating multiple groups of data, the stability and consistency of the data can be further verified, thereby enhancing the reliability of the measurement results. Brief Description of the Drawings

[0025] Figure 1 It is a structural diagram of the stiffness measurement system of the seat spring type variable force spring hanging device in the embodiment of the present invention; Figure 2 It is a three-dimensional schematic diagram of the measurement component in the embodiment of the present invention; Figure 3 It is a schematic diagram of the principle structure of the controller in the embodiment of the present invention; In the figure: 1. Measurement component; 2. Seat spring type variable force spring hanging device; 3. Controller; 11. Bearing steel frame; 12. Loading component; 13. Connecting sleeve; 14. Reinforcing rib plate; 15. Measuring caliper; 16. Level gauge; 21. Sleeve; 22. Seat spring type variable force spring; 23. Suspension rod; 24. Strain measurement chip. Detailed Embodiments

[0026] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] The object of the present invention is to provide a stiffness measurement system and method for a sitting spring variable force spring suspension device, so as to solve the technical problem of low accuracy in measuring the spring performance of the variable force spring suspension device in the prior art.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings: Embodiment 1 Referring to Figure 1 , in an embodiment of the present invention, a stiffness measurement system for a sitting spring variable force spring suspension device is provided, including a measurement component 1 and a controller 3; the measurement component 1 includes a support component and two sets of loading components 12, and the bottom end of the support component is connected to the top of the sitting spring variable force spring suspension device 2; the two sets of loading components 12 are respectively arranged at the bottom end of the support component, and the driving ends of the two sets of loading components 12 respectively abut against both sides of the top of the sitting spring variable force spring suspension device 2 for applying pressure to the sitting spring variable force spring suspension device 2; a measurement caliper 15 is arranged on the support component for measuring the lifting displacement of the support component; a strain measurement sheet 24 is arranged on the sitting spring variable force spring suspension device 2 for measuring the pressure data applied to the sitting spring variable force spring suspension device 2 by the two sets of loading components 12; the two sets of loading components 12 and the strain measurement sheet 24 are respectively connected to the controller 3.

[0029] Specifically, as shown in Figure 2 , the support component includes a load-bearing steel frame 11; the load-bearing steel frame 11 includes an upper top plate and a lower bottom plate; the center lines of the upper top plate and the lower bottom plate are connected by a connecting plate along the long side direction of the plate body to form an I-shaped steel structure; the tops of the two sets of loading components 12 are respectively arranged on both sides of the lower bottom plate; a connecting sleeve 13 is fixedly arranged at the center position of the lower bottom plate and is connected to the top of the sitting spring variable force spring suspension device 2 through the connecting sleeve 13; the measurement caliper 15 is vertically arranged with the load-bearing steel frame 11 and is assembled on the lower bottom plate.

[0030] In this embodiment, the load-bearing steel frame 11 is composed of an upper top plate, a lower bottom plate and a connecting plate, forming an I-shaped steel structure. This structural form has high load-bearing capacity and stability. The center lines of the upper top plate and the lower bottom plate are connected by the connecting plate to ensure the integrity and stability of the structure. The tops of the two groups of loading components 12 are respectively arranged on both sides of the lower bottom plate for loading and compressing the sitting spring type variable force spring hanging device 2. The loading speed and loading force of the loading component 12 are controlled by the controller 3 to achieve precise loading of the sitting spring type variable force spring hanging device 2. A connecting sleeve 13 is fixedly arranged at the central position of the lower bottom plate. The connecting sleeve 13 is used to connect with the top of the sitting spring type variable force spring hanging device 2 to ensure stability and accuracy during the loading process. The measuring caliper 15 is vertically arranged with respect to the load-bearing steel frame 11 and is assembled on the lower bottom plate. It is used to measure the lifting displacement of the sitting spring type variable force spring hanging device 2 during the loading process and provide accurate displacement data.

[0031] Among them, a number of reinforcing rib plates 14 are arranged vertically side by side between the upper top plate and the lower bottom plate.

[0032] In this embodiment, the reinforcing rib plates 14 are vertically arranged between the upper top plate and the lower bottom plate, forming a reinforcement structure. This design effectively increases the bending strength and shear strength of the support assembly, enabling it to withstand greater loads without deformation or damage. By adding the reinforcing rib plates 14, the overall stability of the support assembly is significantly improved. During the loading process, the reinforcing rib plates 14 can effectively disperse and resist the stress and deformation generated due to the load action, thereby maintaining the stable state of the support assembly.

[0033] Among them, a spirit level 16 is provided on the upper top plate. The main function of the spirit level 16 is to detect and display the levelness of the support assembly (and the sitting spring type variable force spring hanging device 2). By observing the indication of the spirit level 16, the operator can quickly determine whether the support assembly is in a horizontal state, thereby ensuring the accuracy and safety of the measurement process.

[0034] Among them, the sitting spring type variable force spring hanging device 2 includes a sleeve 21, a sitting spring type variable force spring 22 and a suspension rod 23; the sleeve 21 is sleeved outside the sitting spring type variable force spring 22, and the driving ends of the two groups of loading components 12 penetrate into the sleeve 21 and abut against the top of the sitting spring type variable force spring 22. The suspension rod 23 is arranged through the vertical central axis of the sitting spring type variable force spring 22. One end of the suspension rod 23 passes through the top of the sleeve 21 and is connected to the connecting sleeve 13 by bolts, and the strain gauge 24 is arranged at the other end of the suspension rod 23.

[0035] In this embodiment, the sleeve 21 is sleeved on the outside of the seat spring type variable force spring 22 to play a role of protection and guidance. At the same time, it also provides an access point for the driving end of the loading assembly 12, so that it can abut against the top of the seat spring type variable force spring 22 for loading. The suspension rod 23 is set through the vertical center axis of the seat spring type variable force spring 22, one end is connected to the connecting sleeve 13 by a bolt, and the other end is provided with a strain gauge 24. The suspension rod 23 not only plays the role of connection and force transmission, but also monitors the strain of the spring in real time through the strain gauge 24.

[0036] Specifically, the suspension rod 23 and the connecting sleeve 13 are coaxially arranged, which means that the axes of the suspension rod 23 and the connecting sleeve 13 are completely coincident, so that the additional stress and deformation caused by the axis deviation can be minimized. This design enables the device to remain stable when subjected to force and is not prone to overturning or instability.

[0037] In this embodiment, the bottom surface of the support assembly is arranged parallel to the top surface of the seat spring type variable force spring suspension device 2. When the bottom surface of the support assembly is parallel to the top surface of the seat spring type variable force spring suspension device 2, the loading force of the loading assembly 12 on the seat spring type variable force spring 22 can be evenly distributed on the entire spring surface. This helps to avoid local stress concentration and deformation caused by uneven force, thereby ensuring the accuracy of the measurement results.

[0038] according to Figure 3 As shown, in this embodiment, a control module is provided in the controller 3, the input end of the control module is connected to the output end of the signal input module, and the input end of the signal input module is connected to the strain measuring gauge 24; the output end of the control module is connected to the input end of the signal output module, and the output end of the signal output module is connected to the processor, the human-computer interaction module and the driving module, and the output end of the driving module is connected to two groups of loading components 12.

[0039] In summary, the present invention provides a stiffness measurement system for a spring-type variable force spring suspension device. By setting two sets of loading components 12, pressure can be accurately applied to both sides of the top of the spring-type variable force spring suspension device 2. This double-sided loading method helps to simulate a more realistic force environment, thereby improving the accuracy of stiffness measurement. At the same time, the use of the strain gauge 24 can obtain the pressure data borne by the device during the loading process in real time and accurately, further enhancing the accuracy of the measurement. Both sets of loading components 12 and the strain gauge 24 are connected to the controller 3, which means that the system can collect and process data in real time. The controller 3 can quickly analyze the pressure applied by the loading component 12 and the strain of the spring-type variable force spring suspension device 2, thereby realizing real-time monitoring and evaluation of the stiffness of the device. This real-time feedback mechanism helps to promptly discover and solve potential problems and improve measurement efficiency and safety.

[0040] Embodiment 2 This embodiment provides a method for measuring the stiffness of a sitting spring type variable force spring hanging device. Based on the above-mentioned stiffness measurement system of a sitting spring type variable force spring hanging device, it includes the following processes: Connect the sitting spring type variable force spring hanging device 2 to the bottom of the support assembly, and perform a zero initial strain operation on the strain gauge 24 on the sitting spring type variable force spring hanging device 2; The controller 3 starts two groups of loading assemblies 12 to load and compress the height of the sitting spring type variable force spring hanging device 2. The controller 3 monitors the real-time strain of the spring hanging device in real time and records the lifting displacement according to the measuring caliper 15; The controller 3 controls the two groups of loading assemblies 12 to repeatedly load and compress the height of the sitting spring type variable force spring hanging device 2, and records multiple groups of strain-displacement data; Process and calculate multiple groups of strain-displacement data to obtain the stiffness of the sitting spring type variable force spring hanging device 2.

[0041] Specifically, in the step of processing and calculating multiple groups of strain-displacement data to obtain the stiffness of the sitting spring type variable force spring hanging device 2, during the continuous loading measurement process, the strain and displacement data should be read multiple times and recorded as ε 1 、ε 2 、ε 3 、…ε x and h 1 、h 2 、h 3 、…h x 。 At the same time, the nominal stress σ = ε E , E is the elastic modulus of the suspension device boom 23, and the real-time load can be obtained F = σ S， S is the cross-sectional area of the boom 23. Using the difference method to calculate the real-time load F and the displacement h, the spring stiffness of the measured variable force spring device can be obtained R , is the acceleration due to gravity, and the calculation formula for the stiffness is as follows:

[0042] Among them, R is the spring stiffness, i is the data number, F is the load output by the strain measurement device, h is the displacement output by the stiffness measurement device, and g is the acceleration due to gravity.

[0043] In summary, the present invention also provides a method for measuring the stiffness of a sitting spring variable force spring hanging device. By using the controller 3 to monitor the real-time strain of the spring hanging device in real time and combining with the measuring caliper 15 to record the lifting displacement, the strain-displacement data can be accurately obtained. This high-precision data acquisition method helps to reduce measurement errors and improve the accuracy of stiffness measurement. In the method of the present invention, it is required to repeatedly load and compress the sitting spring variable force spring hanging device 2 and record multiple groups of strain-displacement data. By processing and calculating multiple groups of data, the stability and consistency of the data can be further verified, thereby enhancing the reliability of the measurement results.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A stiffness measurement system for a seat spring type variable force spring suspension device, characterized in that: It includes a measuring component (1) and a controller (3); The measuring assembly (1) comprises a supporting assembly and two groups of loading assemblies (12), wherein the bottom end of the supporting assembly is connected to the top of the seat spring type variable force spring hanging device (2); the two groups of loading assemblies (12) are respectively arranged at the bottom end of the supporting assembly, and the driving ends of the two groups of loading assemblies (12) are respectively abutted against the top sides of the seat spring type variable force spring hanging device (2) for applying pressure to the seat spring type variable force spring hanging device (2); The support assembly is provided with a measuring caliper (15) for measuring the lifting displacement of the support assembly; The seat spring type variable force spring hanging device (2) is provided with a strain measuring sheet (24) for measuring the pressure data applied by the two groups of loading components (12) to the seat spring type variable force spring hanging device (2); The two groups of loading components (12) and the strain measuring gauge (24) are respectively connected to the controller (3).

2. The stiffness measurement system of a seat spring type variable force spring suspension device according to claim 1, characterized in that: The support assembly comprises a bearing steel frame (11); the bearing steel frame (11) comprises an upper top plate and a lower bottom plate; the center lines of the upper top plate and the lower bottom plate are connected by a connecting plate along the long side direction of the plate body to form an I-shaped steel structure; The top ends of the two groups of loading assemblies (12) are respectively arranged on both sides of the lower base plate; a connecting sleeve (13) is fixedly arranged at the center of the lower base plate, and is connected to the top of the seat spring type variable force spring suspension device (2) via the connecting sleeve (13); The measuring caliper (15) is arranged vertically to the bearing steel frame (11), and the measuring caliper (15) is mounted on the lower base plate.

3. The stiffness measurement system of a seat spring type variable force spring suspension device according to claim 2, characterized in that: A plurality of reinforcing ribs (14) are arranged vertically side by side between the upper top plate and the lower bottom plate.

4. The stiffness measurement system of a seat spring type variable force spring suspension device according to claim 2, characterized in that: A level gauge (16) is provided on the upper top plate.

5. The stiffness measurement system of a seat spring type variable force spring suspension device according to claim 2, characterized in that: The seat spring type variable force spring hanging device (2) comprises a sleeve (21), a seat spring type variable force spring (22) and a hanging rod (23); The sleeve (21) is sleeved on the outside of the seat spring type variable force spring (22), the driving ends of the two sets of loading assemblies (12) penetrate the sleeve (21) and abut against the top of the seat spring type variable force spring (22), the suspension rod (23) is arranged through the vertical center axis of the seat spring type variable force spring (22), one end of the suspension rod (23) passes through the top of the sleeve (21) and is connected to the connecting sleeve (13) by a bolt, and the strain gauge (24) is arranged at the other end of the suspension rod (23).

6. The stiffness measurement system of a seat spring type variable force spring suspension device according to claim 5, characterized in that: The suspension rod (23) and the connecting sleeve (13) are coaxially arranged.

7. The stiffness measurement system of a seat spring type variable force spring suspension device according to claim 1, characterized in that: The bottom surface of the support assembly is arranged parallel to the top surface of the seat spring type variable force spring suspension device (2).

8. The stiffness measurement system of a seat spring type variable force spring suspension device according to claim 1, characterized in that: The controller is provided with a control module, the input end of the control module is connected to the output end of the signal input module, the input end of the signal input module is connected to a strain measuring gauge (24); the output end of the control module is connected to the input end of the signal output module, the output end of the signal output module is connected to a processor, a human-computer interaction module and a drive module, and the output end of the drive module is connected to two groups of loading components (12).

9. A method for measuring the stiffness of a seat spring type variable force spring suspension device, based on a stiffness measuring system for a seat spring type variable force spring suspension device according to any one of claims 1 to 8, characterized in that: The process includes the following: Connecting the seat spring type variable force spring hanging device (2) to the bottom of the support assembly, and performing a zeroing initial strain operation on the strain measuring gauge (24) on the seat spring type variable force spring hanging device (2); The controller (3) starts two sets of loading components (12) to load and compress the seat spring type variable force spring suspension device (2), and the controller (3) monitors the real-time strain of the spring suspension device in real time, and records the lifting displacement according to the measuring caliper (15); The controller (3) controls two groups of loading components (12) to repeatedly load and compress the seat spring type variable force spring suspension device (2) to increase its height, and records multiple groups of strain-displacement data; The stiffness of the seat spring variable force spring suspension device is obtained by processing and calculating multiple sets of strain-displacement data.

10. The stiffness measurement method of a seat spring type variable force spring suspension device according to claim 9, characterized in that: In the step of processing and calculating the multiple sets of strain-displacement data to obtain the stiffness of the seat spring type variable force spring suspension device, the stiffness calculation formula is as follows: Wherein, R is the spring stiffness, i is the data number, F is the load output by the strain measurement device, h is the displacement output by the stiffness measurement device, and g is the gravitational acceleration.

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