Rigidity measuring device

Abstract

The invention provides a rigidity measuring device, which comprises a displacement detection piece and a clamping piece, and is characterized in that the clamping piece is used for clamping a to-be-measured bearing and is connected with the circumferential outer wall of a shaft sleeve of the to-be-measured bearing, and the displacement detection piece is used for detecting the displacement of the clamping piece along the radial direction of the to-be-measured bearing; the device comprises a clamping piece, a flexible chain and at least one counterweight piece, one end of the flexible chain is connected with the at least one counterweight piece, the other end of the flexible chain is connected with the clamping piece through a flexible loading assembly, and the flexible loading assembly is used for limiting the loading force transmitted to the clamping piece by the counterweight piece to be the force in the radial direction of the bearing to be measured, so that the clamping piece moves in the radial direction of the bearing to be measured. According to the invention, the problem of low test accuracy of the radial rigidity of the air bearing in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of stiffness testing of aerostatic bearings, and more particularly, to a stiffness measurement device. Background Art

[0002] The performance parameters of aerostatic bearings include load-carrying capacity, stiffness, air film thickness, etc. Among them, stiffness (especially radial stiffness) has an important impact on the dynamic performance and system stability of aerostatic bearings.

[0003] When testing the radial stiffness of an aerostatic bearing, generally, a cylinder loading or an electric push rod and other mechanisms are used for loading. However, the structures of the cylinder loading or the electric push rod and other loading mechanisms are complex, which not only increases the cost of the testing device, but also easily generates a large dynamic load impact, and may introduce additional unexpected loads. Especially for aerostatic bearings with a small load-bearing capacity, this impact will cause large fluctuations in the measurement data and affect the accurate measurement of the radial stiffness. Summary of the Invention

[0004] The main object of the present invention is to provide a stiffness measurement device to solve the problem of low testing accuracy of the radial stiffness of aerostatic bearings in the prior art.

[0005] To achieve the above object, the present invention provides a stiffness measurement device, including: a displacement detection member and a clamping member. The clamping member is used for clamping the bearing to be measured and connecting with the circumferential outer wall of the bushing of the bearing to be measured. The displacement detection member is used for detecting the displacement of the clamping member along the radial direction of the bearing to be measured; a flexible chain and at least one counterweight member. One end of the flexible chain is connected with at least one counterweight member, and the other end is connected with the clamping member through a flexible loading assembly. The flexible loading assembly is used for defining that the loading force transmitted by the counterweight member to the clamping member is a force in the radial direction of the bearing to be measured, so as to make the clamping member move along the radial direction of the bearing to be measured.

[0006] Further, the flexible loading assembly includes a first direction control hinge unit and a second direction control hinge unit. The fixed end of the first direction control hinge unit is connected with the clamping member. The free end of the second direction control hinge unit is simultaneously connected with the free end of the first direction control hinge unit and the flexible chain. The free end of the first direction control hinge unit is swingably arranged relative to the fixed end of the first direction control hinge unit around a first preset axis. The free end of the second direction control hinge unit is swingably arranged relative to the bearing to be measured around a second preset axis along a direction close to or away from the bearing to be measured; wherein, the extending direction of the first preset axis, the extending direction of the second preset axis and the radial direction of the bearing to be measured are arranged perpendicular to each other in pairs.

[0007] Further, the stiffness measuring device further includes a tensile force detecting member disposed between the clamping member and the first-direction control hinge unit. The tensile force detecting end of the tensile force detecting member is connected to the fixed end of the first-direction control hinge unit to detect the tensile force extending in the radial direction of the bearing to be measured and transmitted by the first-direction control hinge unit to the clamping member.

[0008] Further, the stiffness measuring device further includes a support assembly and a support platform. The bearing to be measured is disposed on the support platform. The support assembly is connected to the clamping member. The two fixed ends of the second-direction control hinge unit are respectively connected to the support platform and the support assembly. The free end of the second-direction control hinge unit is swingably disposed relative to the fixed end of the second-direction control hinge unit around a second preset axis in a direction approaching or departing from the bearing to be measured.

[0009] Further, the second-direction control hinge unit includes two interconnected hinge structures. The connection portion of each hinge structure forms the free end of the second-direction control hinge unit, and the end portion of each hinge structure away from the connection portion forms the fixed end of the second-direction control hinge unit.

[0010] Further, the clamping member includes two interconnected clamping plates. Each clamping plate is provided with a clamping recess. The two clamping recesses together form a receiving groove for receiving the bearing to be measured. The stiffness measuring device further includes two support load-sharing assemblies. The two support load-sharing assemblies are respectively disposed corresponding to the two clamping plates. Each support load-sharing assembly includes a support rod extending in the axial direction of the bearing to be measured. The two ends of the support rod are respectively connected to the support assembly and the corresponding clamping plate. Wherein, the central axis of the receiving groove coincides with the central axis of the bearing to be measured.

[0011] Further, each support load-sharing assembly further includes two elastic members. The two ends of one elastic member are respectively connected to the support assembly and the support rod, and the two ends of the other elastic member are respectively connected to the corresponding clamping plate and the support rod.

[0012] Further, the stiffness measuring device further includes a reversing wheel. The flexible chain is wound around and passes through the reversing wheel. The height of the reversing wheel in the axial direction of the bearing to be measured is adjustable so that the chain segment of the flexible chain between the clamping member and the reversing wheel extends in the radial direction of the bearing to be measured.

[0013] Further, the stiffness measuring device further includes a limiting member and a rotating shaft. The extending direction of the rotating shaft is parallel to the extending direction of the second preset axis. The rotating shaft passes through the axial center of the reversing wheel, and the reversing wheel is rotatably disposed around the rotating shaft. The limiting member is disposed on the support platform, and the height of the rotating shaft in the axial direction of the bearing to be measured is adjustable on the limiting member.

[0014] Further, the stiffness measurement device further includes a support base and a limiting rod. The displacement detection member and the bearing to be measured are both arranged on the support base, and one axial end of the bearing to be measured is connected to the support base; the limiting rod is arranged on the support assembly, the limiting rod extends along the axial direction of the bearing to be measured, and the other axial end of the bearing to be measured abuts against the limiting rod.

[0015] Applying the technical solution of the present invention, the stiffness measurement device includes a displacement detection member, a clamping member, a flexible chain, a flexible loading assembly and at least one counterweight. During the test, the clamping member is used to fix the bearing to be measured, and is tightly connected to the outer circumferential wall of the bushing of the bearing, ensuring that the radial displacement of the clamping member detected by the displacement detection member can accurately reflect the radial displacement change of the bushing of the bearing to be measured. One end of the flexible chain is connected to one or more counterweights, and the other end is connected to the clamping member through the flexible loading assembly. Due to the special design of the flexible chain and the flexible loading assembly, non-radial forces can be effectively filtered out, ensuring the purity of the loading force, avoiding the introduction of additional unexpected loads, and avoiding measurement errors caused by the interference of vertical, axial or inclined forces in the traditional loading method; at the same time, the force transmitted by the counterweight to the clamping member through the flexible loading assembly and the flexible chain is more stable and controllable, avoiding the dynamic load impact that may be caused by rapid loading such as cylinder or electric push rod loading, resulting in deformation of the bearing to be measured, thus solving the problem of low test accuracy of the radial stiffness of the air bearing in the prior art; in addition, the structural design of the stiffness measurement device is simple and the operation is intuitive, which not only reduces the manufacturing and maintenance costs, but also reduces the technical requirements for the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0017] Figure 1 Shows an isometric structural schematic diagram of an embodiment of the stiffness measurement device according to the present invention;

[0018] Figure 2 Shows a front view structural schematic diagram of an angle of the stiffness measurement device according to the present invention;

[0019] Figure 3 Shows a front view structural schematic diagram of another angle of the stiffness measurement device according to the present invention;

[0020] Figure 4 Shows a side view structural schematic diagram of an angle of the stiffness measurement device according to the present invention;

[0021] Figure 5FIG2 shows a schematic side structural diagram of the stiffness measuring device according to the present invention from another angle.

[0022] The above drawings include the following reference numerals:

[0023] 10. Displacement detection member; 20. Clamping member; 30. Flexible chain; 40. First direction control hinge unit; 50. Tension detection member; 60. Second direction control hinge unit; 70. Support platform; 80. Support assembly; 910. Support rod; 920. Elastic member; 100. Reversing wheel; 110. Rotating shaft; 120. Limiting member; 130. Support base; 140. Limiting rod; 150. Counterweight; 170. Hinge structure; 21. Clamping plate; 1. Bearing to be measured; 31. Transition seat; 32. Adjusting seat; 33. Adjusting bolt. DETAILED DESCRIPTION

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary instructions, these orientation terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0027] Please refer to Figures 1 to 5 , the present invention provides a stiffness measuring device, including: a displacement detector 10 and a clamping member 20. The clamping member 20 is used to clamp the bearing 1 to be measured and is connected to the circumferential outer wall of the bushing of the bearing 1 to be measured. The displacement detector 10 is used to detect the displacement of the clamping member 20 in the radial direction of the bearing 1 to be measured; a flexible chain 30 and at least one counterweight 150. One end of the flexible chain 30 is used to connect to at least one counterweight 150, and the other end is connected to the clamping member 20 through a flexible loading assembly. The flexible loading assembly is used to define that the loading force transmitted by the counterweight 150 to the clamping member 20 is a force in the radial direction of the bearing 1 to be measured, so that the clamping member 20 moves in the radial direction of the bearing 1 to be measured.

[0028] The stiffness measuring device of the present invention includes a displacement detector 10, a clamping member 20, a flexible chain 30, a flexible loading assembly and at least one counterweight 150. During the test, the clamping member 20 is used to fix the bearing 1 to be measured and is tightly connected to the circumferential outer wall of the bushing of the bearing, ensuring that the displacement of the clamping member 20 in the radial direction detected by the displacement detector 10 can accurately reflect the displacement change of the bushing of the bearing 1 to be measured in the radial direction. One end of the flexible chain 30 is connected to one or more counterweights 150, and the other end is connected to the clamping member 20 through a flexible loading assembly. Due to the special design of the flexible chain 30 and the flexible loading assembly, non-radial forces can be effectively filtered out, ensuring the purity of the loading force, avoiding the introduction of additional unexpected loads, and avoiding measurement errors caused by the interference of vertical, axial or inclined direction forces in the traditional loading method; at the same time, the force transmitted by the counterweight 150 to the clamping member 20 through the flexible loading assembly and the flexible chain 30 is more stable and controllable, avoiding the dynamic load impact that may be caused by rapid loading such as cylinder or electric push rod loading, resulting in deformation of the bearing 1 to be measured, thus solving the problem of low test accuracy of the radial stiffness of the air bearing in the prior art; in addition, the structural design of this stiffness measuring device is simple and the operation is intuitive, which not only reduces the manufacturing and maintenance costs, but also reduces the technical requirements for the operator.

[0029] Specifically, the radial direction of the bearing to be measured only refers to Figure 2In the X direction in [description], the axial direction of the bearing to be measured refers to Figure 2 the Y direction in [description]. The counterweight 150 is a weight, and by adjusting the number of weights, the loading force applied to the clamping member 20 can be adjusted.

[0030] In this embodiment, the flexible loading assembly includes a first-direction control hinge unit 40 and a second-direction control hinge unit 60. The fixed end of the first-direction control hinge unit 40 is connected to the clamping member 20, and the free end of the second-direction control hinge unit 60 is simultaneously connected to the free end of the first-direction control hinge unit 40 and the flexible chain 30. The free end of the first-direction control hinge unit 40 is swingably arranged relative to the fixed end of the first-direction control hinge unit 40 around a first preset axis, and the free end of the second-direction control hinge unit 60 is swingably arranged relative to the bearing 1 to be measured around a second preset axis in a direction approaching or departing from the bearing 1 to be measured; wherein, the extending directions of the first preset axis, the second preset axis, and the radial direction of the bearing 1 to be measured are arranged perpendicular to each other in pairs.

[0031] Specifically, by swinging the free end of the first-direction control hinge unit 40 around the first preset axis, it can be restricted that the second-direction control hinge unit 60 can only move in the radial direction of the bearing 1 to be measured in a direction approaching or departing from the bearing, avoiding measurement errors caused by the interference of axial-direction forces. And by swinging the free end of the second-direction control hinge unit 60 around the second preset axis, it can be ensured that the acting direction of the loading force transmitted from the free end of the first-direction control hinge unit 40 to the fixed end of the first-direction control hinge unit 40 can only be along the radial direction of the bearing 1 to be measured, avoiding measurement errors caused by the interference of inclined-direction forces. Furthermore, through the flexible loading assembly, it can be defined that the loading force transmitted from the counterweight 150 to the clamping member 20 is a force in the radial direction of the bearing 1 to be measured, further ensuring the purity of the loading force and the accuracy of direction control. This dual control mechanism effectively avoids the interference of axial or inclined-direction forces and improves the accuracy and reliability of radial stiffness measurement.

[0032] Specifically, the first preset axis extends along the axial direction of the bearing to be measured. The first preset axis, the second preset axis and the radial direction of the bearing to be measured are perpendicular to each other in pairs, forming a three-dimensional direction control system. This design enables the flexible loading component to independently control the components of the loading force in each direction, achieving force decoupling, that is, ensuring that the radial loading force is not affected by the axial or inclined direction forces. Force decoupling is particularly important for the radial stiffness test of air bearings with small load-bearing capacity and sensitive air film thickness. It can avoid test errors caused by impure loading force directions and improve the accuracy of test results. The hinge structure design of the first direction control hinge unit 40 and the second direction control hinge unit 60 improves the structural stability of the flexible loading component. This improvement in stability not only ensures the smooth transmission of force during the loading process, but also provides a stable and controllable environment for the test, which is beneficial to obtaining test results with better repeatability and consistency. The higher the structural stability, the better the test repeatability, which is of great significance for batch testing and quality control.

[0033] Optionally, the first direction control hinge unit 40 is a spherical notch hinge, and the notch of the spherical notch hinge extends along the extension direction of the second preset axis; the second direction control hinge unit 60 is a planar combined hinge.

[0034] In this embodiment, the stiffness measuring device further includes a tensile force detecting member 50. The tensile force detecting member 50 is disposed between the clamping member 20 and the first direction control hinge unit 40. The tensile force detecting end of the tensile force detecting member 50 is connected to the fixed end of the first direction control hinge unit 40 to detect the tensile force extending along the radial direction of the bearing 1 to be measured and transmitted by the first direction control hinge unit 40 to the clamping member 20.

[0035] Specifically, this design ensures that the tensile force detection member 50 can accurately detect in real time the radial tensile force transmitted by the first-direction control hinge unit 40 to the clamping member 20. Accurately detecting the magnitude of the applied force is the basis for calculating the radial stiffness. The high-precision detection of the tensile force detection member 50 ensures the accuracy of the obtained tensile force data. This is crucial for subsequent radial stiffness calculations and directly relates to the accuracy of the test results. At the same time, the accuracy and stability of the tensile force data also enhance the reliability of the entire test process and ensure the scientific nature of the test results. During the test process, the applied force, such as the weight of the weights, needs to be transmitted to the clamping member 20 through the flexible chain 30 and then act on the bearing 1 to be measured. The precise detection function of the tensile force detection member 50 can monitor the magnitude of the tensile force in real time, providing instant feedback for the test process. The operator can monitor the magnitude of the applied force at any time to ensure the consistency and accuracy of the test conditions. During the test process, if it is found that the tensile force deviates from the preset value, the operator can immediately make adjustments to avoid test errors caused by fluctuations in the applied force. This monitoring and adjustment function improves the stability of the test and the reliability of the data, thereby ensuring the precise control of the applied force and avoiding radial stiffness measurement errors caused by inaccurate applied forces.

[0036] Optionally, the stiffness measurement device further includes a transition seat 31. The first-direction control hinge unit 40 is fixedly connected to the transition seat 31 by screwing in bolts, and the transition seat 31 is connected to the tensile force detection end of the tensile force detection member 50 by a thread.

[0037] Optionally, the tensile force detection member 50 is a tensile force sensor, and the flexible chain 30 is a steel wire rope.

[0038] In specific implementation, the bearing 1 to be measured is an air-bearing. In an air-bearing, the shaft and the bearing sleeve are separated by a thin air film. This air film will deform when bearing a load, resulting in a radial displacement of the bearing sleeve relative to the shaft. The purpose of radial stiffness measurement is to evaluate the ability of the air-bearing to resist this radial displacement under a radial load. The displacement detection member 10 is a displacement sensor, and the displacement detection member 10 is used to measure the radial displacement of the bearing sleeve of the bearing 1 to be measured relative to the shaft under a radial load. The clamping member 20 is used to clamp the bearing 1 to be measured and is connected to the circumferential outer wall of the bearing sleeve of the bearing 1 to be measured. After the measurement is completed, the position of the bearing 1 to be measured in the clamping member 20 is adjusted multiple times so that the circumferential outer walls of different positions of the bearing sleeve of the bearing 1 to be measured are respectively subjected to radial loads to ensure the comprehensiveness of the data and the calculation of the average value of the air film gap. According to the magnitude of the radial load measured by the tensile force detection member 50 and the radial displacement of the bearing sleeve measured by the displacement detection member 10, the radial stiffness of the air-bearing is calculated using a formula. A common formula for radial stiffness is: Radial stiffness = Radial load / Radial displacement.

[0039] In this embodiment, the stiffness measuring device further includes a support assembly 80 and a support platform 70. The bearing 1 to be measured is disposed on the support platform 70. The support assembly 80 is connected to the clamping member 20. Two fixed ends of the second-direction control hinge unit 60 are respectively connected to the support platform 70 and the support assembly 80. The free end of the second-direction control hinge unit 60 is swingably arranged relative to the fixed end of the second-direction control hinge unit 60 about a second preset axis in a direction approaching or departing from the bearing 1 to be measured.

[0040] Specifically, two fixed ends of the second-direction control hinge unit 60 are respectively connected to the support platform 70 and the support assembly 80. The free end of the second-direction control hinge unit 60 can swing about the second preset axis in a direction approaching or departing from the bearing 1 to be measured. The purpose of this design is to decouple the loading force from the axial or inclined direction and ensure that it is transmitted to the bearing 1 to be measured only in the radial direction. By precisely controlling the swinging direction of the free end of the second-direction control hinge unit 60, the second-direction control hinge unit 60 can convert the force from the counterweight 150 into a radial force, avoiding the influence of non-radial forces and improving the accuracy and reliability of the radial stiffness measurement.

[0041] Specifically, the support platform 70 is used to carry the bearing 1 to be measured and ensure its position stability during the test. By placing the bearing on the support platform 70, it can be ensured that there is no displacement perpendicular to the radial direction during radial loading, which is crucial for the measurement of radial stiffness. The design of the support platform 70 provides the necessary rigidity and smoothness, enabling the bearing to withstand the loading force without generating additional instability or vibration.

[0042] Specifically, by connecting with the support assembly 80, the clamping member 20 ensures the radial positioning and fixation of the bearing 1 to be measured. During the test, the clamping member 20 can stably clamp the bearing to prevent unnecessary displacement during radial loading. This radial positioning ability is crucial for the accurate measurement of radial stiffness, ensuring that the loading force can be accurately applied to the radial surface of the bearing and avoiding the influence of axial or inclined forces on the test results.

[0043] In this embodiment, the second-direction control hinge unit includes two interconnected hinge structures 170. The connection part of each hinge structure 170 forms the free end of the second-direction control hinge unit 60, and the end of each hinge structure 170 away from the connection part forms the fixed end of the second-direction control hinge unit 60.

[0044] Specifically, the free end of the second direction control hinge unit 60 is formed by the connection of each hinge structure 170, and the end of each hinge structure 170 away from the connection forms the fixed end of the second direction control hinge unit 60. The free end of the second direction control hinge unit 60 swings around the second preset axis relative to the fixed end of the second direction control hinge unit 60, decoupling the loading force from the tilting direction. At the same time, since the two hinge structures 170 are connected together, the two hinge structures 170 constrain each other, avoiding axial movement of the free end of the second direction control hinge unit 60, thereby ensuring that the second direction control hinge unit 60 can decouple the loading force from the axial direction, ensuring that the loading force is only transmitted to the bearing 1 to be measured in the radial direction.

[0045] In this embodiment, the clamping member includes two interconnected clamping plates 21, each clamping plate 21 is provided with a clamping recess, and the two clamping recesses together constitute a receiving groove for accommodating the bearing 1 to be measured; the stiffness measuring device also includes two support and load-sharing components, and the two support and load-sharing components are respectively arranged in a one-to-one correspondence with the two clamping plates 21, and each support and load-sharing component includes a support rod 910 extending along the axial direction of the bearing 1 to be measured, and the two ends of the support rod 910 are respectively connected to the support assembly 80 and the corresponding clamping plate 21; wherein, the central axis of the receiving groove coincides with the central axis of the bearing 1 to be measured.

[0046] Specifically, the clamping device consists of two interconnected clamping plates 21, each with a clamping recess. Together, the two recesses form a receiving slot for precisely positioning and securing the bearing 1 to be measured. This design ensures the stability and positioning accuracy of the bearing 1 to be measured during testing, avoiding testing errors caused by bearing displacement or vibration. The central axis of the receiving slot coincides with the central axis of the bearing 1 to be measured, further ensuring that the test force acts uniformly and accurately on the bearing 1 in the radial direction, thereby improving the accuracy of the testing device.

[0047] Specifically, the introduction of the support and load-sharing assembly aims to decouple axial forces while ensuring uniform distribution of radial forces. Each support and load-sharing assembly includes a support rod 910 extending axially along the bearing 1 to be measured. The ends of the support rod 910 are connected to the support assembly 80 and the corresponding clamping plate 21, respectively. This structural design effectively shields the gravitational forces of the bearing sleeve, clamping member 20, and support and load-sharing assembly from the bearing sleeve to be measured. This ensures that the force applied to the bearing sleeve is solely the designed radial force, improving the accuracy and reliability of radial stiffness testing.

[0048] Specifically, the two load-sharing support assemblies help evenly distribute the load around the circumference of the bearing 1 being measured, avoiding local overloads and ensuring consistent air-film clearance across the entire circumference. Even under complex loads, the load-sharing springs dynamically adjust at multiple contact points, ensuring the shaft and sleeve of the bearing 1 being measured maintain precise relative positions during radial force loading, effectively maintaining a uniform air-film clearance.

[0049] In this embodiment, each supporting load-sharing assembly also includes two elastic members 920, the two ends of one elastic member 920 are respectively connected to the supporting assembly 80 and the support rod 910, and the two ends of the other elastic member 920 are respectively connected to the corresponding clamping plate 21 and the support rod 910.

[0050] Specifically, the elastic member 920 cooperates with other components of the support and load-sharing assembly to further ensure that the support and load-sharing assembly can achieve decoupling of axial force, thereby avoiding the gravity interference of the sleeve, clamping member 20 and support and load-sharing assembly of the bearing 1 to be measured on the test results.

[0051] In this embodiment, the stiffness measuring device also includes a reversing wheel 100, and the flexible chain 30 is wound around the reversing wheel 100. The height of the reversing wheel 100 along the axial direction of the bearing 1 to be measured is adjustable so that the chain segment of the flexible chain 30 located between the clamping member 20 and the reversing wheel 100 extends along the radial direction of the bearing 1 to be measured.

[0052] Specifically, by adjusting the height of the reversing wheel 100 in the axial direction of the bearing 1 to be measured, the chain segment of the flexible chain 30 located between the clamping member 20 and the reversing wheel 100 can be precisely controlled to extend in the radial direction of the bearing 1 to be measured. This design ensures that the flexible chain 30 always maintains a linear path consistent with the radial direction of the bearing 1 to be measured during the force transmission process, thereby avoiding the introduction of non-radial forces and improving the accuracy of radial stiffness measurement. At the same time, the height adjustment function of the reversing wheel 100 enhances the flexibility of the test device, enabling it to adapt to the testing requirements of bearings 1 to be measured of different sizes or structures. Regardless of how the radial dimensions of the bearing 1 to be measured change, the operator can ensure that the chain segment of the flexible chain 30 always extends in the radial direction by adjusting the height of the reversing wheel 100, ensuring the correctness and consistency of the direction of the loading force, thereby improving the versatility and adaptability of the test device.

[0053] In this embodiment, the stiffness measurement device further includes a limiting member 120 and a rotating shaft 110. The extending direction of the rotating shaft 110 is parallel to the extending direction of the second preset axis. The rotating shaft 110 passes through the axial center of the reversing wheel 100, and the reversing wheel 100 is rotatably arranged around the rotating shaft 110. The limiting member 120 is arranged on the support platform 70, and the height of the rotating shaft 110 in the axial direction of the bearing 1 to be measured is adjustably arranged on the limiting member 120.

[0054] Specifically, the reversing wheel 100 rotates around the rotating shaft 110, and its shaft direction is parallel to the second preset axis, and the second preset axis is also the control axis in the radial direction. This design ensures that when the flexible chain 30 or the loading wire rope passes through the reversing wheel 100, the direction of the force can be smoothly and accurately converted into a radial force, thereby avoiding non-radial force components that may be introduced during the force conversion process and improving the accuracy of the radial stiffness test. The combination of the limiting member 120 and the rotating shaft 110 enables the height of the rotating shaft 110 to be adjustable in the axial direction of the bearing 1 to be measured. This design has high flexibility and can precisely adjust the position of the reversing wheel 100 according to the test requirements and the specific parameters of the bearing 1 to be measured, ensuring that the loading wire rope or the flexible chain 30 contacts the reversing wheel 100 at the best angle, thereby reducing the force decomposition error caused by improper angles and improving the efficiency and accuracy of the radial loading.

[0055] During specific implementation, the stiffness measurement device further includes an adjusting seat 32 and an adjusting bolt 33. The adjusting seat is arranged on the limiting member 120. One end of the adjusting bolt 33 is connected to the adjusting seat 32, and the other end is connected to the rotating shaft 110. When the adjusting bolt 33 is rotated, its threaded movement will directly push or pull the rotating shaft 110, thereby changing the height of the rotating shaft 110 in the axial direction of the bearing 1 to be measured.

[0056] In this embodiment, the stiffness measurement device further includes a support base 130 and a limiting rod 140. The displacement detector 10 and the bearing 1 to be measured are both arranged on the support base 130, and one axial end of the bearing 1 to be measured is connected to the support base 130. The limiting rod 140 is arranged on the support assembly 80, and the limiting rod 140 extends in the axial direction of the bearing 1 to be measured, and the other axial end of the bearing 1 to be measured abuts against the limiting rod 140.

[0057] Specifically, the support base 130 is arranged on the support platform 70. The support base 130 serves as the basis of the entire measuring device and provides a stable support plane for fixing and positioning the bearing 1 to be measured. By connecting one axial end of the bearing to the support base 130, it can be ensured that the bearing will not undergo axial displacement during the test, which is crucial for the accurate measurement of radial stiffness. Any slight axial movement may introduce non-radial forces and affect the accuracy of the test results. Therefore, the stable connection between the support base 130 and the bearing provides the necessary axial stability for the test process. The displacement detection member 10 is arranged on the support base 130, closely adjacent to the bearing 1 to be measured. This design ensures that the displacement detection member can directly and accurately measure the radial displacement of the bearing under the action of the loading force. Since the axial position of the bearing is fixed, any deformation caused by loading will be manifested in the form of radial displacement. The displacement detection member can convert these tiny displacement changes into readable data, providing a basis for the calculation of radial stiffness.

[0058] Specifically, a stopper rod 140 is mounted on support assembly 80, extending along the axial direction of bearing 1 to be measured and abutting the other axial end of the bearing. This design provides axial support at the other end of the bearing, ensuring that the bearing does not undergo axial displacement or tilt when radially loaded, thus preventing axial deviation from affecting test results.

[0059] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0060] The stiffness measuring device of the present invention includes a displacement detection member 10, a clamping member 20, a flexible chain 30, a flexible loading assembly and at least one counterweight 150. During the test process, the clamping member 20 is used to fix the bearing 1 to be measured and is tightly connected to the circumferential outer wall of the bearing sleeve to ensure that the radial displacement of the clamping member 20 detected by the displacement detection member 10 can accurately reflect the radial displacement change of the sleeve of the bearing 1 to be measured. One end of the flexible chain 30 is connected to one or more counterweights 150, and the other end is connected to the clamping member 20 through the flexible loading assembly. Due to the special design of the flexible chain 30 and the flexible loading assembly, non-radial forces can be effectively filtered out, ensuring the purity of the loading force and avoiding the introduction of additional unexpected loads. The measurement error caused by the interference of vertical, axial or oblique forces in the traditional loading method is avoided; at the same time, the force transmitted by the counterweight 150 to the clamping member 20 through the flexible loading component and the flexible chain 30 is more stable and controllable, avoiding the dynamic load impact caused by rapid loading such as cylinder or electric push rod loading, which causes the bearing 1 to be measured to deform, thereby solving the problem of low test accuracy of the radial stiffness of the air-floating bearing in the prior art; in addition, the structural design of the stiffness measuring device is simple and the operation is intuitive, which not only reduces the cost of manufacturing and maintenance, but also reduces the technical requirements of the operator.

[0061] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0062] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present application.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A stiffness measurement device, characterized in that, Comprising: A displacement detection member (10) and a clamping member (20), wherein the clamping member (20) is used for clamping the bearing (1) to be measured and connecting with the circumferential outer wall of the bushing of the bearing (1) to be measured, and the displacement detection member (10) is used for detecting the displacement of the clamping member (20) along the radial direction of the bearing (1) to be measured; A flexible chain (30) and at least one counterweight member (150), one end of the flexible chain (30) is connected with the at least one counterweight member (150), and the other end is connected with the clamping member (20) through a flexible loading assembly, and the flexible loading assembly is used for defining that the loading force transmitted by the counterweight member (150) to the clamping member (20) is a force in the radial direction of the bearing (1) to be measured, so that the clamping member (20) moves along the radial direction of the bearing (1) to be measured.

2. The stiffness measurement device according to claim 1, wherein The flexible loading assembly includes a first direction control hinge unit (40) and a second direction control hinge unit (60), the fixed end of the first direction control hinge unit (40) is connected with the clamping member (20), the free end of the second direction control hinge unit (60) is simultaneously connected with the free end of the first direction control hinge unit (40) and the flexible chain (30), the free end of the first direction control hinge unit (40) is swingably arranged relative to the fixed end of the first direction control hinge unit (40) around a first preset axis, and the free end of the second direction control hinge unit (60) is swingably arranged relative to the bearing (1) to be measured around a second preset axis along the direction of approaching or departing from the bearing (1) to be measured; wherein, the extending directions of the first preset axis, the second preset axis and the radial direction of the bearing (1) to be measured are arranged perpendicular to each other in pairs.

3. The stiffness measuring device according to claim 2, characterized in that, The stiffness measuring device further includes a tensile force detection member (50), the tensile force detection member (50) is arranged between the clamping member (20) and the first direction control hinge unit (40), and the tensile force detection end of the tensile force detection member (50) is connected with the fixed end of the first direction control hinge unit (40) to detect the tensile force extending along the radial direction of the bearing (1) to be measured transmitted by the first direction control hinge unit (40) to the clamping member (20).

4. The stiffness measuring device according to claim 3, wherein The stiffness measuring device further includes a support assembly (80) and a support platform (70), the bearing (1) to be measured is arranged on the support platform (70), the support assembly (80) is connected with the clamping member (20), two fixed ends of the second direction control hinge unit (60) are respectively connected with the support platform (70) and the support assembly (80), and the free end of the second direction control hinge unit (60) is swingably arranged relative to the fixed end of the second direction control hinge unit (60) around the second preset axis along the direction of approaching or departing from the bearing (1) to be measured.

5. The stiffness measuring device according to claim 4, wherein The second-direction control hinge unit includes two interconnected hinge structures (170). The connection part of each hinge structure (170) forms the free end of the second-direction control hinge unit (60), and the end of each hinge structure (170) away from the connection part forms the fixed end of the second-direction control hinge unit (60).

6. The stiffness measuring device according to claim 5, wherein, The clamping member includes two interconnected clamping plates (21). Each clamping plate (21) is provided with a clamping recess, and the two clamping recesses together form a receiving groove for receiving the bearing to be measured (1); the stiffness measuring device further includes two support load-sharing components. The two support load-sharing components are respectively arranged in one-to-one correspondence with the two clamping plates (21). Each support load-sharing component includes a support rod (910) extending along the axial direction of the bearing to be measured (1). The two ends of the support rod (910) are respectively connected to the support component (80) and the corresponding clamping plate (21); wherein, the central axis of the receiving groove coincides with the central axis of the bearing to be measured (1).

7. The stiffness measuring device according to claim 6, wherein Each of the support load-sharing components further includes two elastic members (920). One end of one elastic member (920) is respectively connected to the support component (80) and the support rod (910), and the two ends of the other elastic member (920) are respectively connected to the corresponding clamping plate (21) and the support rod (910).

8. The stiffness measuring device according to claim 5, wherein The stiffness measuring device further includes a reversing wheel (100). The flexible chain (30) is wound around and passes through the reversing wheel (100). The height of the reversing wheel (100) along the axial direction of the bearing to be measured (1) is adjustable, so that the chain segment of the flexible chain (30) between the clamping member (20) and the reversing wheel (100) extends along the radial direction of the bearing to be measured (1).

9. The stiffness measuring device according to claim 8, characterized in that The stiffness measuring device further includes a limiting member (120) and a rotating shaft (110). The extending direction of the rotating shaft (110) is parallel to the extending direction of the second preset axis. The rotating shaft (110) passes through the axial center of the reversing wheel (100), and the reversing wheel (100) is rotatably arranged around the rotating shaft (110); the limiting member (120) is arranged on the support platform (70), and the height of the rotating shaft (110) along the axial direction of the bearing to be measured (1) is adjustable on the limiting member (120).

10. The stiffness measuring device according to claim 4, characterized in that, The stiffness measuring device further includes a support base (130) and a limiting rod (140). The displacement detection member (10) and the bearing to be measured (1) are both arranged on the support base (130), and one axial end of the bearing to be measured (1) is connected to the support base (130); the limiting rod (140) is arranged on the support component (80), the limiting rod (140) extends along the axial direction of the bearing to be measured (1), and the other axial end of the bearing to be measured (1) abuts against the limiting rod (140).

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