Displacement non-contact feedback rod elastic part rigidity measuring device

Abstract

The invention discloses a displacement non-contact feedback rod elastic part rigidity measuring device which comprises a side face fixing module, a measuring fixing module, a pressure sensing module and a force applying mechanism. The feedback rod to be measured is arranged on the measurement fixing module, and the side fixing module is used for applying pressure to the measurement fixing module, so that the measurement fixing module clamps the interference end of the feedback rod to be measured; the ball head of the feedback rod to be tested is positioned above the pressure sensor module; the pressure sensing module is pushed by the force application mechanism to move towards the ball head of the to-be-tested feedback rod, and forces the to-be-tested feedback rod to bear specified pressure and deform; a displacement sensor on the side fixing module carries out displacement measurement on the ball head of the to-be-measured feedback rod. The problems of poor rigidity measurement consistency and low efficiency of the elastic part of the servo valve are solved. The device is easy and convenient to operate, high in universality and capable of rapidly adjusting the axial position of the workpiece to be machined, the radial positioning requirement of the workpiece is met, and the assembly production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of elastic component stiffness measurement, in particular to a displacement non-contact feedback rod elastic component stiffness measurement device. Background Art

[0002] The elastic parts of the servo valve include a feedback rod and a spring tube. The feedback rod plays a displacement feedback role, feeding back the displacement of the valve core to the armature assembly in the form of force to form a closed-loop control. The stiffness of the servo valve elastic parts determines the dynamic and static characteristics of the servo valve. Therefore, the servo valve elastic parts must meet strict stiffness requirements. At present, the stiffness assurance measure for the servo valve elastic parts is the measurement while processing. The consistency and efficiency of the test directly determine the consistency of the final performance of the product.

[0003] During the operation of the servo valve, the feedback rod is used to convert the displacement of the valve core into torque and feed it back to the armature assembly to offset the electromagnetic torque. Therefore, the stiffness of the feedback rod is the ratio of the force generated by the ball of the feedback rod to the displacement of the ball. Figure 1 As shown. First fix the interference section of the feedback rod, then apply a force F0 to the ball head of the feedback rod, record the corresponding displacement S0, continue to increase the force to F1, record the corresponding displacement S1, calculate the ratio of the change in force to the change in displacement, and the stiffness of the feedback rod can be calculated. The stiffness calculation formula is as follows:

[0004]

[0005] Servo valves often have performance problems that exceed the design value due to inaccurate stiffness testing during production. When retesting the stiffness of the feedback rod, it was found that its stiffness value was greater than the design value. Since the components could not be repaired, batches of them were scrapped. At present, there are the following problems in the stiffness measurement of the elastic parts of the feedback rod: (1) There is a systematic error in the contact displacement measurement that affects the test accuracy: the force and displacement data of the measurement process are collected from the ball of the measuring rod, and the deformation of the test fixture and the deformation of the clamping section are all included in the displacement measurement data. This leads to large and unstable system errors in the stiffness measurement, especially in the stiffness measurement process of elastic parts with large stiffness; (2) The manual test is inefficient and human factors affect the test accuracy: the stiffness measurement process is manual testing of force application, workpiece clamping, and measurement point reading. The parts are placed on the fixture by hand and tightened with a wrench. The force is applied by manually rotating the force to push the parts or the fixture to cause the parts to deform, and then the data of the measurement points are manually taken on the instrument. The test process is inefficient and the test consistency is not high due to human factors.

[0006] Due to the above two problems, the batch consistency of the stiffness of the elastic parts of the feedback rod is not high, which affects the consistency of the performance of the servo valve itself and the matching process performance of the whole machine. Therefore, it is urgent to carry out research on automatic and accurate testing. Summary of the invention

[0007] The present invention provides a displacement non-contact feedback rod elastic part stiffness measurement device, which solves the problem of poor consistency and low efficiency in stiffness measurement of servo valve elastic parts, and improves stiffness measurement consistency and measurement efficiency. The device is simple and convenient to operate, has strong versatility, can adapt to different feedback rod sizes by replacing a single workpiece component, can quickly adjust the axial position of the workpiece, and meet the radial fine positioning requirements of the workpiece, reducing the production cost of components, etc. This device can also be used for other products using this fixing method.

[0008] In a first aspect, a displacement non-contact feedback rod elastic part stiffness measuring device is provided, comprising a side fixing module, a measuring fixing module, a pressure sensing module and a force applying mechanism; the feedback rod to be measured is arranged on the measuring fixing module, and the side fixing module is used to apply pressure to the measuring fixing module so that the measuring fixing module clamps the interference end of the feedback rod to be measured; the ball head of the feedback rod to be measured is located above the pressure sensor module; the pressure sensing module moves toward the ball head of the feedback rod to be measured under the push of the force applying mechanism, and forces the feedback rod to be measured to bear a specified pressure and deform; the displacement sensor on the side fixing module measures the displacement of the ball head of the feedback rod to be measured, and the position on the pressure sensing module that contacts the ball head of the feedback rod to be measured and the connection line of the displacement sensor are the displacement direction of the ball head of the feedback rod to be measured.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the side fixing module includes a slide plate, a tension clamping block, the slide plate is a plate structure with a slide rail, and the direction of the slide rail is arranged perpendicular to the placement direction of the feedback rod to be measured; the tension clamping block moves relative to the slide rail; the tension clamping block is used to apply pressure on the fixing module so that the measuring fixing module clamps the interference end of the feedback rod to be measured.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the tension clamping block is designed with a cylinder tensioning structure and a spring structure on the bottom. The cylinder acts on the spring part, and the pressure value of the cylinder is controlled to ensure that the clamping force on the feedback rod to be tested is consistent.

[0011] In combination with the first aspect, in some implementations of the first aspect, the measurement fixing module includes a feedback rod clamp, the feedback rod clamp is used to clamp the interference section of the feedback rod to be measured; the feedback rod clamp has a clamping portion, the clamping portion is arranged facing the tension clamping block, and the tension clamping block is used to apply pressure to the clamping portion; one end of the clamping portion is open and the other end is closed; the opening of the clamping portion is a wire cutting opening structure, and the opening angle is 1° to 3°;

[0012] The feedback rod to be tested is installed into the clamping part of the feedback rod clamp from the opening; when the tension clamping block applies pressure to the clamping part, the opening of the clamping part is compressed to clamp the interference section of the feedback rod to be tested.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the feedback rod clamp has a stepped hole between the closed end and the open section and near the closed end; the stepped hole is in the shape of a countersunk hole including a large hole and a small hole; the large hole of the stepped hole is located on the side of the small hole away from the ball portion of the feedback rod to be tested; the large hole of the stepped hole is used to avoid tail interference when the feedback rod to be tested is installed; the inner diameter of the small hole of the stepped hole matches the outer diameter of the interference section of the feedback rod to be tested, and is used to clamp the interference section of the feedback rod to be tested.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the clamping portion of the feedback lever clamp has a through hole at the closed end to release stress, the axes of the through hole and the stepped hole are located in the same plane, and the opening of the clamping portion passes through the through hole and the stepped hole.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the side fixing module includes a side fixing plate, and the slide plate is fixed on the side fixing plate; the measurement fixing module also includes a fixture fixing base; the fixture fixing base is provided with a groove design; the groove surrounds the periphery of the slide plate; there is a threaded mounting hole on the side of the groove for connecting and fixing with the side fixing plate; the feedback rod clamp is fixedly installed with the fixture fixing base.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the pressure sensing module includes a top block; a pressure sensor; the pressure sensor is installed on the force-applying mechanism to withstand the thrust from the force-applying mechanism; the lower surface of the top block is fixed on the pressure sensor; and the upper surface of the top block is arranged opposite to the ball portion of the feedback rod to be tested.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the force-applying mechanism includes a rotating shaft; a shaft fixing block; a spring sheet; and a spring feeding mechanism; the shaft fixing block is disposed on the rotating shaft, and the shaft fixing block can rotate relative to the rotating shaft; one end of the spring sheet is fixed on the shaft fixing block; a spring feeding mechanism is disposed at an end of the spring sheet away from the rotating shaft; and the spring feeding mechanism is used to push the spring sheet to move upward so as to apply thrust on the pressure sensing module.

[0018] In a second aspect, a method for using the displacement non-contact feedback rod elastic part stiffness measuring device as described in any one of the implementations of the first aspect is provided, comprising:

[0019] Place the feedback rod to be tested into the measurement fixing module, and adjust the axial position of the feedback rod to be tested so that the ball of the feedback rod to be tested is above the pressure sensor module and below the displacement sensor;

[0020] Apply pressure to the measuring fixing module through the side fixing module, so that the measuring fixing module clamps the interference end of the feedback rod to be measured;

[0021] The pressure sensor module is pushed upward by the force-applying mechanism to gradually approach the ball head of the feedback rod to be tested. When the distance between the pressure sensor module and the ball head of the feedback rod to be tested is less than a preset distance, the pressure sensor module is started to record the force applied to the ball head of the feedback rod to be tested, and the displacement sensor is started to record the displacement of the ball head of the feedback rod to be tested;

[0022] Continue to push the pressure sensor module upward through the force-applying mechanism until the measurement requirements are met;

[0023] The stiffness of the feedback rod to be tested is determined based on the relationship between the force and displacement of the ball head of the feedback rod to be tested.

[0024] Compared with the prior art, the solution provided by the present invention includes at least the following beneficial technical effects:

[0025] This application uses a motor to drive the spring feed mechanism to push the spring sheet to drive the pressure sensor module to move upward. After the top block contacts the ball of the feedback rod to be measured, as the thrust of the spring increases, the measuring surface of the top block pushes the ball of the feedback rod to apply radial force to the feedback rod, causing the feedback rod to bend and deform. The laser coaxial displacement sensor measures the displacement of the test piece after the force is applied and the force fed back by the system, and calculates the stiffness value of the feedback. This application is simple to operate and has the advantages of strong versatility, linear force, stable measurement values, and high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the feedback lever measurement principle.

[0027] Figure 2 It is a schematic diagram of a displacement non-contact feedback rod elastic part stiffness measurement device.

[0028] Figure 3 This is a schematic diagram of the side fixing module.

[0029] Figure 4 Schematic diagram of the measurement fixed module.

[0030] Figure 5 Schematic diagram of the force sensing module.

[0031] Figure 6 Schematic diagram of the force-applying mechanism.

[0032] Figure 7 This is a schematic diagram of the feedback rod clamping block.

[0033] Explanation of the reference numerals: 1—side fixing module; 2—measuring fixing module; 3—pressure sensing module; 4—force applying mechanism; 1.1—side fixing plate; 1.2—slide plate; 1.3—tension clamping block; 1.4—laser coaxial displacement sensor; 1.5—sensor fixing plate; 1.6—fixing screw; 2.1—clamp fixing base; 2.2—feedback rod clamp; 2.3—feedback rod to be measured; 2.4—fixing screw; 3.1—top block; 3.2—fixing screw; 3.3—pressure sensor; 4.1—rotating shaft; 4.2—shaft fixing block; 4.3—fixing screw; 4.4—spring sheet; 4.5—spring feeding mechanism. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 2 A schematic diagram of a displacement non-contact feedback rod elastic part stiffness measurement device provided by the present invention. The measurement device includes a side fixing module 1, a measuring fixing module 2, a pressure sensing module 3 and a force applying mechanism 4. The feedback rod 2.3 to be measured is arranged on the measuring fixing module 2, and the side fixing module 1 is used to apply pressure to the measuring fixing module 2 so that the measuring fixing module 2 clamps the interference end of the feedback rod 2.3 to be measured. The ball head of the feedback rod 2.3 to be measured is located above the pressure sensor module 3. The pressure sensing module 3 moves toward the ball head of the feedback rod 2.3 to be measured under the push of the force applying mechanism 4, and forces the feedback rod 2.3 to be measured to bear a specified pressure and deform. The displacement sensor on the side fixing module 1 measures the displacement of the ball head of the feedback rod 2.3 to be measured, thereby completing the feedback rod stiffness measurement.

[0036] like Figure 3 As shown, the side fixing module 1 may include a side fixing plate 1.1, a slide rail plate 1.2, a tension clamping block 1.3, a laser coaxial displacement sensor 1.4, and a sensor fixing plate 1.5. The slide rail plate 1.2 and the sensor fixing plate 1.5 are fixed to the side fixing plate 1.1 by fixing screws 1.6. The slide rail plate 1.2 is a plate structure with a slide rail, and the direction of the slide rail is perpendicular to the placement direction of the feedback rod 2.3 to be measured. A tension clamping block 1.3 is arranged on the slide rail of the slide rail plate 1.2, and the tension clamping block 1.3 moves relative to the slide rail. The tension clamping block 1.3 is used to apply pressure on the fixing module 2 so that the measuring fixing module 2 clamps the interference end of the feedback rod 2.3 to be measured. The tension clamping block 1.3 can be designed with a cylinder tensioning structure, and a spring structure is provided on the bottom surface. The cylinder acts on the spring part, and the pressure value of the cylinder is controlled to ensure that the clamping force on the feedback rod 2.3 to be measured is consistent. The laser coaxial displacement sensor 1.4 is fixed on the sensor fixing plate 1.5 and is used to be arranged facing the ball head of the feedback rod 2.3 to be tested. The laser coaxial displacement sensor 1.4 is used to measure the displacement of the feedback rod 2.3 to be tested after being subjected to force.

[0037] like Figure 4 As shown, the measurement fixing module 2 includes a fixture fixing base 2.1 and a feedback rod fixture 2.2.

[0038] Combination Figure 3 , the fixture fixing base 2.1 can be fixed on the side fixing plate 1.1. The fixture fixing base 2.1 is provided with a groove design. The groove surrounds the periphery of the slide rail plate 1.2; there are threaded mounting holes on the side of the groove for connecting and fixing with the side fixing plate 1.1. The feedback rod fixture 2.2 and the fixture fixing base 2.1 are installed by fixing screws 2.4. By controlling the flatness and parallelism of the groove surface of the fixture fixing base 2.1 and the parallelism and flatness of the bottom surface of the feedback rod fixture 2.2 in contact therewith, the deviation caused by repeated inconsistent measurements of the stiffness value caused by the incorrect installation of the feedback rod can be eliminated.

[0039] The feedback rod clamp 2.2 is used to clamp the interference section of the feedback rod 2.3 to be tested. Figure 4 and Figure 5 As shown, the feedback lever fixture 2.2 has a clamping portion, combined with Figure 3 , the clamping part is arranged facing the tension clamping block 1.3, and the tension clamping block 1.3 is used to apply pressure to the clamping part. The clamping part has an opening at one end and a closed end. The feedback rod 2.3 to be tested can be loaded into the clamping part of the feedback rod clamp 2.2 from the opening. When the tension clamping block 1.3 applies pressure to the clamping part, the opening of the clamping part is compressed to clamp the interference section of the feedback rod 2.3 to be tested. The feedback rod clamp 2.2 is made of elastic soft metal material to prevent the feedback rod 2.3 to be tested from being clamped.

[0040] The clamping part of the feedback lever clamp 2.2 has a through hole at the closed end, and a stepped hole between the closed end and the opening section and near the closed end. The axes of the through hole and the stepped hole are located in the same plane. The plane where the through hole and the stepped hole axes are located is not more than 0.01mm parallel to the bottom surface of the feedback lever clamp 2.2. The opening of the clamping part is a wire-cut opening structure, which runs through the through hole and the stepped hole, and the opening angle is 2°.

[0041] The stepped hole of the clamping part of the feedback rod clamp 2.2 is a countersunk shape including a large hole and a small hole. The large hole of the stepped hole is located on the side of the small hole away from the ball of the feedback rod 2.3 to be measured. The large hole of the stepped hole is used to avoid tail interference when the feedback rod 2.3 to be measured is installed. The inner diameter of the small hole of the stepped hole matches the outer diameter of the interference section of the feedback rod 2.3 to be measured, and is used to clamp the interference section of the feedback rod 2.3 to be measured. The small hole of the stepped hole can be designed with multiple diameter sizes to accommodate the measurement of various different types of feedback rods, and the clamp adopts an elastic opening clamp design to achieve rapid replacement of the test piece.

[0042] The through hole of the clamping part of the feedback rod clamp 2.2 is designed for elastic stress dispersion, which is used to release stress when clamping the feedback rod 2.3 to be tested to avoid stress and prevent stress concentration at the root when the feedback rod clamp 2.2 is locked.

[0043] like Figure 6 As shown, the pressure sensing module 3 includes a top block 3.1, a fixing screw 3.2, and a pressure sensor 3.3. Figure 6 In the embodiment shown, the pressure sensor 3.3 is a single-point weighing sensor, which is a standard component. Figure 2 , the pressure sensor 3.3 can be installed on the force applying mechanism 4 to bear the thrust from the force applying mechanism 4. The lower surface of the top block 3.1 and the pressure sensor 3.3 are installed by fixing screws 3.2. The upper surface of the top block 3.1 is arranged opposite to the ball of the feedback rod 2.3 to be tested. The upper and lower surfaces of the top block 3.1 are parallel and the flatness is not greater than 0.01mm, and the upper surface finish is Ra0.4.

[0044] The process of clamping the feedback rod 2.3 to be tested includes: placing the feedback rod 2.3 to be tested into the stepped hole of the feedback rod clamp 2.2, adjusting the axial position of the feedback rod 2.3 to be tested so that the ball part of the feedback rod 2.3 to be tested is directly above the center position of the plane of the top block 3.1; starting the tension clamping block 1.3 of the side fixing module 1, clamping the wire-cut open end of the feedback rod clamp 2.2 under the action of the cylinder, indirectly clamping the feedback rod 2.3 to be tested, and controlling the pressure value of the cylinder to ensure consistent clamping force.

[0045] like Figure 7 As shown, the force applying mechanism 4 includes a rotating shaft 4.1; a shaft fixing block 4.2; a fixing screw 4.3; a spring sheet 4.4; and a spring feeding mechanism 4.5. Figure 2 and Figure 3 , the rotating shaft 4.1 can be fixed to the side fixing plate 1.1 by screws. The shaft fixing block 4.2 is set on the rotating shaft 4.1, and the shaft fixing block 4.2 can rotate relative to the rotating shaft 4.1. The rotating shaft 4.1 and the shaft fixing block 4.2 are precisely matched with each other, so that the shaft fixing block 4.2 can rotate seamlessly along the shaft. One end of the spring sheet 4.4 can be fixed to the shaft fixing block 4.2 by a fixing screw 4.3. A spring feeding mechanism 4.5 is set at the end of the spring sheet 4.4 away from the rotating shaft 4.1. After the spring feeding mechanism 4.5 is energized, it can push the spring sheet 4.4 to move upward, and its internal control motor can ensure uniform movement.

[0046] Combination Figure 2 and Figure 6, the pressure sensor 3.3 can be arranged above the spring feed mechanism 4.5. The long spring sheet 4.4 is adopted, which has the function of supporting and damping, and ensures the stable force application during the test process. The rotating shaft 4.1 and the shaft fixing block 4.2 are fixed to the proximal end of the spring sheet 4.4 by screws, and the pressure sensor module 3 is installed at the distal end of the spring sheet 4.4 to ensure parallel force application during the force application process. The lower end of the spring sheet 4.4 is close to the distal end and the spring feed mechanism 4.5 is driven by the motor to push the spring sheet 4.4 to drive the pressure sensor module 3 to move upward. When the top block 3.1 contacts the ball part of the feedback rod 2.3 to be tested, as the thrust of the spring increases, the measuring surface of the top block 3.1 (the upper surface of the top block 3.1) pushes the ball part of the feedback rod 2.3 to be tested, thereby applying force to the ball part of the feedback rod 2.3 to be tested, so that the feedback rod 2.3 to be tested is bent and deformed. The present invention realizes the smooth transmission of the radial displacement of the test piece through the double lever mechanism of the force application mechanism 4 and the force sensing module 3, so that the force sensing module 3 can accurately collect the force value.

[0047] The following describes the method of using the above-mentioned measuring device. Pass the feedback rod 2.3 to be tested through the feedback rod clamp 2.2, adjust the position of the ball of the feedback rod 2.3 to be tested, and place the stiffness measurement support point of the feedback rod 2.3 to be tested to the center position just above the top block 3.1. After placement, press the open end of the feedback rod clamp 2.2 tightly by the tension clamp block 1.3 to clamp the feedback rod 2.3 to be tested. Push the spring sheet 4.4 through the spring feed mechanism 4.5 to drive the pressure sensor module 3 to move upward, and stop moving when it is 2mm away from the ball of the feedback rod. The laser coaxial displacement sensor 1.4 is located in the center position just above the pressure sensor module 3. When the pressure sensor module 3 continues to move upward and contacts the ball of the feedback rod, the feedback rod is bent and deformed, and the displacement of the measuring surface of the top block 3.1 is measured by the laser coaxial displacement sensor 1.4, and the pressure sensor 3.3 measures the feedback force value, thereby calculating the stiffness value of the feedback. The stiffness value of the feedback is calculated by the force and displacement of the system feedback. After the measurement is completed, reset to the starting state.

[0048] The non-contact feedback rod elastic part stiffness measuring device provided by the present invention has high precision, simple principle, and is easy to use. It is a device for high-precision clamping and measurement in the machining process. After adopting a specially designed positioning clamping device, it can meet the high-precision measurement requirements of feedback rod parts, and the measurement value is stable and the measurement accuracy is high. It can save measurement time, shorten the part processing cycle, and improve processing efficiency. This device can meet the clamping requirements of feedback rod parts of different diameters.

[0049] The present invention provides a highly efficient and adjustable positioning technology for different feedback rod parts to adapt to the measurement of feedback rod parts of various types and specifications, keep the measuring position stable, realize fast clamping and precise alignment of the feedback rod parts, and improve the accuracy and efficiency of stiffness measurement.

[0050] The entire installation and measurement process of the present invention is easy to control, which can avoid damage to the feedback rod during the measurement process, reduce the influence of mechanical, electromagnetic interference and other jitters on the measurement accuracy, and is suitable for measuring the stiffness of various elastic parts in the research and development and production stages.

[0051] Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A displacement non-contact feedback rod elastic part stiffness measurement device, characterized in that: The invention comprises a side fixing module (1), a measuring fixing module (2), a pressure sensing module (3) and a force applying mechanism (4); the feedback rod (2.3) to be tested is arranged on the measuring fixing module (2); the side fixing module (1) is used to apply pressure to the measuring fixing module (2) so that the measuring fixing module (2) clamps the interference end of the feedback rod (2.3) to be tested; the ball head of the feedback rod (2.3) to be tested is located above the pressure sensor module (3); the pressure sensing module (3) moves towards the ball head of the feedback rod (2.3) to be tested under the push of the force applying mechanism (4), and forces the feedback rod (2.3) to be tested to bear a specified pressure and deform; the displacement sensor on the side fixing module (1) measures the displacement of the ball head of the feedback rod (2.3) to be tested; the position on the pressure sensing module (3) in contact with the ball head of the feedback rod (2.3) to be tested and the connection line of the displacement sensor are the displacement direction of the ball head of the feedback rod (2.3) to be tested.

2. The measuring device according to claim 1, characterized in that The side fixing module (1) comprises a slide rail plate (1.2) and a tension clamping block (1.3); the slide rail plate (1.2) is a plate structure having a slide rail, and the direction of the slide rail is arranged perpendicular to the placement direction of the feedback rod (2.3) to be measured; the tension clamping block (1.3) moves relative to the slide rail; and the tension clamping block (1.3) is used to apply pressure on the fixing module (2) so that the measuring fixing module (2) clamps the interference end of the feedback rod (2.3) to be measured.

3. The measuring device according to claim 2, characterized in that The tension clamping block (1.3) is designed with a cylinder tensioning structure and a spring structure on the bottom surface. The cylinder acts on the spring part, and the pressure value of the cylinder is controlled to ensure that the clamping force on the feedback rod (2.3) to be measured is consistent.

4. The measuring device according to claim 2 or 3, characterized in that The measuring fixing module (2) comprises a feedback rod clamp (2.2), the feedback rod clamp (2.2) is used to clamp the interference section of the feedback rod (2.3) to be measured; the feedback rod clamp (2.2) has a clamping portion, the clamping portion is arranged facing the tension clamping block (1.3), and the tension clamping block (1.3) is used to apply pressure to the clamping portion; one end of the clamping portion is open and the other end is closed; the opening of the clamping portion is a wire-cut opening structure, and the opening angle is 1° to 3°; The feedback rod (2.3) to be tested is inserted into the clamping portion of the feedback rod clamp (2.2) from the opening; when the tension clamping block (1.3) applies pressure to the clamping portion, the opening of the clamping portion is compressed to clamp the interference section of the feedback rod (2.3) to be tested.

5. The measuring device according to claim 4, characterized in that The feedback rod clamp (2.2) has a stepped hole between the closed end and the open section and at a position close to the closed end; the stepped hole is in the shape of a countersunk hole including a large hole and a small hole; the large hole of the stepped hole is located on the side of the small hole away from the ball portion of the feedback rod (2.3) to be tested; the large hole of the stepped hole is used to avoid tail interference when the feedback rod (2.3) to be tested is installed; the inner diameter of the small hole of the stepped hole matches the outer diameter of the interference section of the feedback rod (2.3) to be tested, and is used to clamp the interference section of the feedback rod (2.3) to be tested.

6. The measuring device according to claim 5, characterized in that The clamping part of the feedback lever clamp (2.2) has a through hole at the closed end to release stress, the axes of the through hole and the stepped hole are located in the same plane, and the opening of the clamping part passes through the through hole and the stepped hole.

7. The measuring device according to any one of claims 4 to 6, characterized in that The side fixing module (1) comprises a side fixing plate (1.1), and the slide rail plate (1.2) is fixed on the side fixing plate (1.1); the measurement fixing module (2) further comprises a fixture fixing base (2.1); the fixture fixing base (2.1) is provided with a groove design; the groove surrounds the periphery of the slide rail plate (1.2); a threaded mounting hole is provided on the side of the groove for connecting and fixing with the side fixing plate (1.1); and the feedback rod fixture (2.2) is fixedly installed with the fixture fixing base (2.1).

8. The measuring device according to any one of claims 1 to 7, characterized in that The pressure sensing module (3) comprises a top block (3.1); a pressure sensor (3.3); the pressure sensor (3.3) is mounted on a force applying mechanism (4) to bear the thrust from the force applying mechanism (4); the lower surface of the top block (3.1) is fixed on the pressure sensor (3.3); and the upper surface of the top block (3.1) is arranged opposite to the ball portion of the feedback rod (2.3) to be tested.

9. The measuring device according to any one of claims 1 to 8, characterized in that The force-applying mechanism (4) comprises a rotating shaft (4.1); a shaft fixing block (4.2); a spring sheet (4.4); and a spring feeding mechanism (4.5); the shaft fixing block (4.2) is arranged on the rotating shaft (4.1), and the shaft fixing block (4.2) can rotate relative to the rotating shaft (4.1); one end of the spring sheet (4.4) is fixed on the shaft fixing block (4.2); a spring feeding mechanism (4.5) is arranged at one end of the spring sheet (4.4) away from the rotating shaft (4.1); the spring feeding mechanism (4.5) is used to push the spring sheet (4.4) to move upward, so as to apply a thrust on the pressure sensing module (3).

10. A method for using the displacement non-contact feedback rod elastic part stiffness measuring device according to any one of claims 1 to 9, characterized in that: include: Place the feedback rod (2.3) to be tested into the measurement fixing module (2), and adjust the axial position of the feedback rod (2.3) to be tested so that the ball portion of the feedback rod (2.3) to be tested is located above the pressure sensor module (3) and below the displacement sensor; Applying pressure to the measuring fixing module (2) through the side fixing module (1) so that the measuring fixing module (2) clamps the interference end of the feedback rod (2.3) to be measured; The pressure sensor module (3) is pushed upward by a force-applying mechanism (4) to gradually approach the ball head of the feedback rod (2.3) to be tested, and when the distance between the pressure sensor module (3) and the ball head of the feedback rod (2.3) to be tested is less than a preset distance, the pressure sensor module (3) is started to record the force applied to the ball head of the feedback rod (2.3) to be tested, and the displacement sensor is started to record the displacement of the ball head of the feedback rod (2.3) to be tested; Continue to push the pressure sensor module (3) upwards through the force applying mechanism (4) until the measurement requirements are met; The stiffness of the feedback rod (2.3) to be tested is determined based on the relationship between the force and displacement of the ball head of the feedback rod (2.3) to be tested.

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