A leaf spring rigidity detection device

Abstract

The utility model relates to a kind of plate spring rigidity detection devices, including pedestal, drive mechanism and the plate spring inner hole that can pass through axis direction is x direction and with the transmission mechanism of the plate spring fixed, the mounting hole is opened in the pedestal, the mounting hole has the hole wall for the outer ring installation of the plate spring, the transmission mechanism extends along x direction, the transmission mechanism is driven connection with the drive mechanism and is by the drive mechanism exert perpendicular force with x direction, the plate spring rigidity detection device further includes to detect the deformation detection mechanism of the plate spring deformation variable.The plate spring rigidity detection device provided in the utility model solves the problem that there is a large error between the design value and the actual value of the plate spring in the existing plate spring design method.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a leaf spring stiffness testing device. Background Technology

[0002] Stirling refrigerators are widely used in cryogenic applications and are a type of regenerative refrigeration machine. Flexible leaf springs, as a key component supporting the piston in the moving subsystem of a small Stirling refrigerator, ensure contactless movement between the piston and the cylinder wall. The size of the piston-cylinder clearance is crucial for ensuring dynamic sealing during piston movement. Therefore, leaf spring technology is one of the key technologies for the long lifespan and high reliability of Stirling refrigerators.

[0003] Key parameters of leaf springs include fatigue strength, axial stiffness, radial stiffness, and resonant frequency. Fatigue strength analysis ensures that the maximum stress of the leaf spring during operation does not exceed the material's fatigue limit, and is typically verified through simulation analysis combined with run-through testing. Modal analysis yields the leaf spring's resonant frequency. Stiffness analysis provides the largest possible radial-axial stiffness ratio for the piston's linear reciprocating motion. Currently, simulation methods are mostly used to calculate the radial and axial stiffness of the leaf spring, but physical measurement and calibration of the parts are not possible. Therefore, there is a significant error between the design and actual values ​​of the leaf spring, leading to reduced refrigerator efficiency. Utility Model Content

[0004] The main purpose of this invention is to propose a leaf spring stiffness testing device, which aims to solve the problem of large errors between the design value and the actual value of leaf springs in existing leaf spring design methods.

[0005] To achieve the above objectives, this utility model proposes a leaf spring stiffness testing device, comprising a base, a drive mechanism, and a transmission mechanism that can pass through the inner hole of the leaf spring with the axial direction in the x direction and is fixed to the leaf spring. The base has a mounting hole with a hole wall for mounting the outer ring of the leaf spring. The transmission mechanism extends along the x direction and is drivenly connected to the drive mechanism, and the drive mechanism applies a force perpendicular to the x direction. The leaf spring stiffness testing device also includes a deformation detection mechanism for detecting the deformation of the leaf spring.

[0006] According to some embodiments of the present invention, the deformation detection mechanism includes a displacement sensor disposed on the base, and the transmission mechanism is at least partially located within the detection area of ​​the displacement sensor.

[0007] According to some embodiments of the present invention, the transmission mechanism includes a leaf spring clamping assembly and a rod for the leaf spring to be sleeved. The leaf spring clamping assembly is located within the detection area of ​​the displacement sensor. One end of the rod is connected to the leaf spring clamping assembly, and the rod and the leaf spring clamping assembly cooperate to form a limiting groove for restricting the movement of the leaf spring in the length direction of the rod. The rod has a force-applying surface for the driving mechanism to apply force.

[0008] According to some embodiments of this utility model, there are two displacement sensors and two leaf spring clamping assemblies. The two leaf spring clamping assemblies are respectively located in the detection areas of the two displacement sensors. The base has two mounting holes spaced apart in the x-direction. The two ends of the rod are respectively connected to the two leaf spring clamping assemblies, and the rod cooperates with the two leaf spring clamping assemblies to form two limiting grooves. The distance between the force application surface of the rod and the two limiting grooves is equal.

[0009] According to some embodiments of the present invention, a positioning hole is provided on the force-applying surface of the rod, which can contact the driving mechanism, and the positioning hole is equal to the distance between the two limiting grooves.

[0010] According to some embodiments of the present invention, the rod also has a stepped surface that can abut against the side of the leaf spring, and the leaf spring pressing assembly is movable and adjustable in the length direction of the rod so that the leaf spring pressing assembly presses the leaf spring on the stepped surface.

[0011] According to some embodiments of the present invention, the leaf spring clamping assembly includes a locking member and a clamping member that can abut against the side of the leaf spring. The clamping member is sleeved on the rod, and the clamping member cooperates with the stepped surface to form the limiting groove. The locking member is threadedly connected to the end of the rod and abuts against the clamping member.

[0012] According to some embodiments of the present invention, the detection port of the displacement sensor is disposed facing the clamping member, and the clamping member is disposed in a plane directly opposite the detection port of the displacement sensor.

[0013] According to some embodiments of the present invention, the rod also has a mating surface that can cooperate with the inner wall of the clamping member to restrict the rotation of the clamping member.

[0014] According to some embodiments of the present invention, the base includes a base body and a leaf spring positioning member. The base body has a hollow area, and the leaf spring positioning member is detachably installed on the hollow area of ​​the base body. The leaf spring positioning member has the mounting hole.

[0015] This utility model has at least the following beneficial effects:

[0016] In this invention, the leaf spring's axis is in the x-direction. The outer ring of the leaf spring is installed in the mounting hole of the base. Simultaneously, a transmission mechanism passes through the inner hole of the leaf spring and connects to it. When the driving mechanism applies a force perpendicular to the x-direction to the transmission mechanism, the transmission mechanism will translate or deflect, causing the leaf spring to deform. A deformation detection mechanism detects the translational value or deflection angle of the leaf spring. Combined with the force applied by the driving mechanism, the actual radial stiffness and actual bending stiffness of the leaf spring can be calculated. This invention measures the actual radial stiffness and actual bending stiffness of the leaf spring using the leaf spring stiffness detection device. By comparing this measurement with the stiffness values ​​calculated through simulation, the simulation results can be corrected, and the design adjustment of the leaf spring can be guided, thereby reducing the error between the designed and actual values ​​of the leaf spring. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a leaf spring stiffness detection device provided in an embodiment of this utility model;

[0019] Figure 2 for Figure 1 Cross-sectional view of the transmission mechanism and leaf spring;

[0020] Figure 3 for Figure 1 Structural diagram of the middle member;

[0021] Figure 4 This is a schematic diagram of the structure of a leaf spring stiffness testing device provided in another embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100-Leaf spring stiffness testing device; 1-Base; 11-Seat body; 12-Leaf spring positioning component; 121-Mounting hole; 2-Transmission mechanism; 21-Rod; 211-Force application surface; 2111-Positioning hole; 212-Step surface; 213-Mating surface; 22-Leaf spring clamping assembly; 221-Locking component; 222-Clamping component; 3-Deformation detection mechanism; 31-Displacement sensor; 311-Detection port; 200-Leaf spring. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] This invention provides a leaf spring stiffness testing device. Figures 1 to 4 This invention provides a specific embodiment of a leaf spring stiffness testing device.

[0028] like Figures 1 to 4 As shown, this utility model embodiment provides a leaf spring stiffness testing device 100, including a base 1, a driving mechanism, and a transmission mechanism 2 that can pass through the inner hole of a leaf spring 200 with the axial direction in the x direction and is fixed to the leaf spring 200. The base 1 has a mounting hole 121 with a hole wall for mounting the outer ring of the leaf spring 200. The transmission mechanism 2 extends along the x direction and is drivenly connected to the driving mechanism and is subjected to a force perpendicular to the x direction by the driving mechanism. The leaf spring stiffness testing device 100 also includes a deformation detection mechanism 3 for detecting the deformation of the leaf spring 200.

[0029] In this invention, the axial direction of the leaf spring 200 is the x-direction. The outer ring of the leaf spring 200 is installed in the mounting hole 121 of the base 1. Simultaneously, the transmission mechanism 2 passes through the inner hole of the leaf spring 200 and connects to it. When the driving mechanism applies a force perpendicular to the x-direction to the transmission mechanism 2, the transmission mechanism 2 will translate or deflect, causing the leaf spring 200 to deform. The deformation detection mechanism 3 detects the translation value or deflection angle of the leaf spring 200. Combined with the value of the force applied by the driving mechanism, the actual radial stiffness and actual bending stiffness of the leaf spring 200 can be calculated. This invention measures the actual radial stiffness and actual bending stiffness of the leaf spring 200 using the leaf spring stiffness detection device 100. By comparing these measurements with the simulation calculations of the stiffness of the leaf spring 200, the simulation results can be corrected, and the design adjustment of the leaf spring 200 can be guided, thereby reducing the error between the design and actual values ​​of the leaf spring 200.

[0030] It should be noted that the driving mechanism includes a force gauge, and the value of the force applied by the driving mechanism can be determined by the value displayed on the force gauge.

[0031] The method by which the deformation detection mechanism 3 obtains the translation value and deflection angle of the leaf spring 200 is not limited; for example, in some embodiments, such as... Figure 1 and Figure 4 As shown, the deformation detection mechanism 3 includes a displacement sensor 31 mounted on the base 1, and the transmission mechanism 2 is at least partially located within the detection area of ​​the displacement sensor 31. With this configuration, when the transmission mechanism 2 translates, the displacement sensor 31 detects the translation value of the transmission mechanism 2, thus obtaining the translation value of the leaf spring 200. When the transmission mechanism 2 deflects, the displacement sensor 31 detects the translation value of the transmission mechanism 2 in the direction perpendicular to the x-direction, and combined with the dimensions of the transmission mechanism 2 within the detection area, the deflection angle of the transmission mechanism 2 can be calculated using trigonometric functions, thus obtaining the deflection angle of the leaf spring 200.

[0032] The specific structure of the transmission mechanism 2 is not limited; for example, in some embodiments, such as... Figure 1 and Figure 2As shown, the transmission mechanism 2 includes a leaf spring clamping assembly 22 and a rod 21 for the leaf spring 200 to be fitted. The leaf spring clamping assembly 22 is located within the detection area of ​​the displacement sensor 31. One end of the rod 21 is connected to the leaf spring clamping assembly 22, and the rod 21 and the leaf spring clamping assembly 22 cooperate to form a limiting groove for restricting the movement of the leaf spring 200 in the length direction of the rod 21. The rod 21 has a force-applying surface 211 for the driving mechanism to apply force. This configuration restricts the movement of the leaf spring 200 in the length direction of the rod 21 through the limiting groove, avoiding interference with the detection of translation values ​​and improving the detection accuracy of the stiffness of the leaf spring 200.

[0033] It should be noted that if only one end of the rod 21 is connected to the leaf spring clamping assembly 22 to limit the movement of one leaf spring 200, the rod 21 can be deflected by applying a force perpendicular to the x-direction to the other end of the rod 21 through the driving mechanism. The displacement sensor 31 detects the translation value of the leaf spring clamping assembly 22 in the direction perpendicular to the x-direction. Combined with the size of the leaf spring clamping assembly 22, the deflection angle of the transmission mechanism 2 can be calculated by substituting trigonometric functions, and thus the deflection angle of the leaf spring 200 can be obtained. The actual bending stiffness of the leaf spring 200 can be calculated by the deflection angle of the leaf spring 200 and the value of the force applied by the driving mechanism.

[0034] It should be noted that a guide structure can also be provided, extending in a direction perpendicular to the x-direction. The end of the rod 21 furthest from the leaf spring clamping assembly 22 is moved and positioned on the guide structure, thus restricting the rod 21 to move only in the direction perpendicular to the x-direction. In this case, a force perpendicular to the x-direction is applied to the middle of the rod 21 by the driving mechanism, causing the rod 21 to move in this direction. This drives the leaf spring clamping assembly 22 and the two leaf springs 200 to move only in the direction perpendicular to the x-direction. The displacement value of the leaf spring clamping assembly 22 can then be detected to obtain the displacement value of the leaf spring 200. The actual radial stiffness of the leaf spring 200 can be calculated using the displacement value of the leaf spring 200 and the force applied by the driving mechanism.

[0035] Furthermore, in some embodiments, such as Figure 1 and Figure 3As shown, there are two displacement sensors 31 and two leaf spring clamping assemblies 22. The two leaf spring clamping assemblies 22 are respectively located in the detection areas of the two displacement sensors 31. The base 1 has two mounting holes 121 spaced apart in the x direction. The two ends of the rod 21 are respectively connected to the two leaf spring clamping assemblies 22, and the rod 21 cooperates with the two leaf spring clamping assemblies 22 to form two limiting grooves. The distance between the force application surface 211 of the rod 21 and the two limiting grooves is equal. This configuration has several advantages. First, the rod 21 and the leaf spring clamping assembly 22 cooperate to form a limiting groove that restricts the movement of the leaf spring 200 along the length of the rod 21. Since the distance between the force-applying surface 211 of the rod 21 and the two limiting grooves is equal, the distance between the force-applying surface 211 and the two leaf springs 200 is also equal, resulting in equal forces on the two leaf springs 200. Furthermore, the driving mechanism applies a force perpendicular to the x-direction, ensuring that the rod 21, the leaf spring clamping assembly 22, and the two leaf springs 200 move only in the direction perpendicular to the x-direction. This eliminates the need for additional guide structures to ensure that the rod 21 can only move in the direction perpendicular to the x-direction, reducing the production cost of the leaf spring stiffness detection device 100. Second, simultaneously detecting the radial stiffness of the two leaf springs 200 improves detection efficiency.

[0036] Preferably, in some embodiments, such as Figure 2 and Figure 3 As shown, the force-applying surface 211 of the rod 21 has a positioning hole 2111 that can contact the driving mechanism. The positioning hole 2111 and the two limiting grooves are equally spaced. By setting the positioning hole 2111, the force-applying point of the driving mechanism can be quickly positioned, thus improving the detection efficiency.

[0037] In some embodiments, such as Figure 2 and Figure 3 As shown, the rod 21 also has a stepped surface 212 that can abut against the side of the leaf spring 200. The leaf spring pressing assembly 22 is movably adjustable along the length of the rod 21 so that the leaf spring pressing assembly 22 presses the leaf spring 200 onto the stepped surface 212. This configuration, by pressing the leaf spring 200 onto the stepped surface 212 of the rod 21 by the leaf spring pressing assembly 22, restricts the axial movement of the leaf spring 200 relative to the rod 21.

[0038] Furthermore, in some embodiments, such as Figure 2 and Figure 3As shown, the leaf spring clamping assembly 22 includes a locking member 221 and a clamping member 222 that abuts against the side of the leaf spring 200. The clamping member 222 is sleeved on the rod 21, and the clamping member 222 cooperates with the stepped surface 212 to form the limiting groove. The locking member 221 is threadedly connected to the end of the rod 21 and abuts against the clamping member 222. By tightening the locking member 221, the locking member 221 applies force to the clamping member 222, thereby transmitting the force to the side of the leaf spring 200 to restrict the leaf spring 200 from moving along the length of the rod 21. With this configuration, the leaf spring 200 is only subjected to force in the x-direction, which will not affect the subsequent detection of radial stiffness.

[0039] The displacement sensor 31 is generally a laser displacement sensor 31, therefore in some embodiments, such as Figure 1 As shown, the detection port 311 of the displacement sensor 31 is positioned facing the clamping member 222, and the clamping member 222 is planar with the detection port 311 of the displacement sensor 31 directly opposite it. This configuration provides a stable and uniform reflective surface for the laser displacement sensor 31, ensuring that the laser displacement sensor 31 can obtain high-precision displacement data.

[0040] Furthermore, in some embodiments, such as Figure 3 As shown, the rod 21 also has a mating surface 213 that can cooperate with the inner wall of the clamping member 222 to restrict the rotation of the clamping member 222. This configuration restricts the rotation of the clamping member 222 through the mating surface 213, ensuring that the plane of the clamping member 222 is directly opposite the detection port 311 of the displacement sensor 31.

[0041] In some embodiments, such as Figure 1 As shown, the base 1 includes a seat body 11 and a leaf spring positioning component 12. The seat body 11 has a hollow area, and the leaf spring positioning component 12 is detachably installed on the hollow area of ​​the seat body 11. The leaf spring positioning component 12 has the mounting hole 121. With this configuration, by replacing leaf spring positioning components 12 of different sizes, different sizes of leaf springs 200 can be adapted, thereby improving the applicability of the leaf spring stiffness detection device 100.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leaf spring stiffness testing device, characterized in that, The device includes a base, a drive mechanism, and a transmission mechanism that passes through the inner hole of the leaf spring in the x-direction and is fixed to the leaf spring. The base has a mounting hole with a hole wall for mounting the outer ring of the leaf spring. The transmission mechanism extends in the x-direction and is drivenly connected to the drive mechanism, which applies a force perpendicular to the x-direction. The leaf spring stiffness detection device also includes a deformation detection mechanism for detecting the deformation of the leaf spring.

2. The leaf spring stiffness testing device as described in claim 1, characterized in that, The deformation detection mechanism includes a displacement sensor mounted on the base, and the transmission mechanism is at least partially located within the detection area of ​​the displacement sensor.

3. The leaf spring stiffness testing device as described in claim 2, characterized in that, The transmission mechanism includes a leaf spring clamping assembly and a rod for the leaf spring to be fitted. The leaf spring clamping assembly is located within the detection area of ​​the displacement sensor. One end of the rod is connected to the leaf spring clamping assembly, and the rod and the leaf spring clamping assembly cooperate to form a limiting groove for restricting the movement of the leaf spring in the length direction of the rod. The rod has a force-applying surface for the driving mechanism to apply force.

4. The leaf spring stiffness testing device as described in claim 3, characterized in that, Two displacement sensors and two leaf spring clamping assemblies are provided. The two leaf spring clamping assemblies are respectively located in the detection areas of the two displacement sensors. The base has two mounting holes spaced apart in the x-direction. The two ends of the rod are respectively connected to the two leaf spring clamping assemblies, and the rod cooperates with the two leaf spring clamping assemblies to form two limiting grooves. The distance between the force application surface of the rod and the two limiting grooves is equal.

5. The leaf spring stiffness testing device as described in claim 4, characterized in that, The force-applying surface of the rod is provided with a positioning hole that can contact the driving mechanism, and the positioning hole is equidistant from the two limiting grooves.

6. The leaf spring stiffness testing device as described in claim 3, characterized in that, The rod also has a stepped surface that can abut against the side of the leaf spring, and the leaf spring pressing assembly is movable and adjustable in the length direction of the rod so that the leaf spring pressing assembly presses the leaf spring onto the stepped surface.

7. The leaf spring stiffness testing device as described in claim 6, characterized in that, The leaf spring clamping assembly includes a locking member and a clamping member that can abut against the side of the leaf spring. The clamping member is sleeved on the rod and cooperates with the stepped surface to form the limiting groove. The locking member is threaded to the end of the rod and abuts against the clamping member.

8. The leaf spring stiffness testing device as described in claim 7, characterized in that, The detection port of the displacement sensor is positioned facing the clamping member, and the clamping member is positioned on a plane directly opposite the detection port of the displacement sensor.

9. The leaf spring stiffness testing device as described in claim 8, characterized in that, The rod also has a mating surface that can engage with the inner wall of the clamping member to restrict the rotation of the clamping member.

10. The leaf spring stiffness testing device as described in claim 1, characterized in that, The base includes a base body and a leaf spring positioning component. The base body has a hollow area, and the leaf spring positioning component is detachably installed on the hollow area of ​​the base body. The leaf spring positioning component has the mounting hole.

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