Measuring device of displacement sensor

Abstract

The invention relates to the technical field of automobile parts, and provides a measuring device for a displacement sensor, and the device comprises an installation mechanism which is used for the assembly of a target object; the space moving mechanism is used for assembling a detected displacement sensor, and the detected displacement sensor is configured to detect the displacement of a target object; wherein the space moving mechanism is arranged close to the mounting mechanism, so that the measured displacement sensor is arranged close to a target object; the driving mechanism is configured to drive the target object to move through the push rod; and a reference displacement sensor disposed adjacent to the pushrod and configured to detect a displacement of the pushrod. According to the invention, deviation verification of different spatial orientations of the tested displacement sensor can be realized, so that the detection precision of the tested displacement sensor can be comprehensively tested.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts, and in particular to a measuring device for a displacement sensor. Background Art

[0002] Displacement sensors have numerous applications in automotive components. For example, brake piston displacement sensors detect the displacement of the brake piston, providing position feedback to the brake control unit to ensure reliable operation of the brake system.

[0003] The measuring device of a displacement sensor is used to test the accuracy of the displacement sensor to ensure that the displacement sensor meets the accuracy standards. A common problem with current measuring devices is that the displacement sensor under test can only detect single-axis displacement, and cannot verify deviations in different spatial directions, thus failing to fully test the accuracy of the displacement sensor under test.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0005] The present application provides a measuring device for a displacement sensor, which at least overcomes the problem that current measuring devices are unable to verify deviations in different spatial orientations and thus are unable to comprehensively detect the accuracy of the displacement sensor being measured.

[0006] According to one aspect of the present application, a measuring device for a displacement sensor is provided, comprising: a mounting mechanism for mounting a target object; a spatial movement mechanism for mounting a displacement sensor to be measured, wherein the displacement sensor to be measured is configured to detect the displacement of the target object; wherein the spatial movement mechanism is disposed adjacent to the mounting mechanism so that the displacement sensor to be measured is disposed close to the target object; a driving mechanism configured to drive the target object to move via a push rod; and a reference displacement sensor disposed adjacent to the push rod and configured to detect the displacement of the push rod.

[0007] The target object is used to simulate or directly adopt the actual detection target of the displacement sensor to be measured. The displacement sensor to be measured is close to the target object in spatial position so as to accurately detect the displacement of the target object. The mounting mechanism and the spatial movement mechanism respectively realize the stable installation of the target object and the displacement sensor to be measured, and the spatial movement mechanism also provides the function of spatial position adjustment. In the process of the driving mechanism driving the target object to move through the push rod, the reference displacement sensor detects the displacement of the push rod (the measured displacement is used as a reference benchmark), and the displacement sensor to be measured detects the displacement of the target object at the same time. By comparing the displacements measured by the two, the detection accuracy of the displacement sensor to be measured can be known. After one detection is completed, the detection dimension of the displacement sensor to be measured is transformed through the spatial movement mechanism, and the driving mechanism is started again for detection, thereby realizing the deviation verification of the displacement sensor to be measured in different spatial orientations, and then comprehensively testing the detection accuracy of the displacement sensor to be measured.

[0008] In some embodiments, the spatial movement mechanism includes a three-axis movement mechanism and / or a rotational movement mechanism.

[0009] The three-axis moving mechanism can realize the movement of the displacement sensor under test in the X / Y / Z axes, and the rotating moving mechanism can realize the rotation of the displacement sensor around the Z axis, so that the displacement sensor under test can flexibly adjust its spatial position according to test needs, increase the test dimension, and thus systematically and comprehensively detect the performance of the displacement sensor under test.

[0010] In some embodiments, the spatial movement mechanism includes: a three-axis slide, including a Y-axis slide, an X-axis slide mounted on the slider of the Y-axis slide, and a Z-axis slide mounted on the slider of the X-axis slide; a rotary slide, mounted on the slider of the Z-axis slide, and the turntable of the rotary slide can rotate around the Z-axis; wherein each slide is equipped with an adjustment handle and a locking handle.

[0011] The three-axis slide conveniently achieves X / Y / Z movement, while the rotary slide flexibly adjusts position in the XY plane. The combination of the three-axis slide and the rotary slide enables comprehensive linear and angular positioning, allowing the displacement sensor under test to be flexibly adjusted in space according to test requirements, increasing the test dimension and enabling systematic and comprehensive performance testing of the displacement sensor under test. The slide's adjustment handle allows for manual adjustment of the slider / rotary table position, while the locking handle locks the slide to ensure data accuracy during testing.

[0012] In some embodiments, the mounting mechanism includes: a hollow mounting cylinder, providing an internal space for assembling the target object, the push rod extending into the internal space from the first end of the mounting cylinder; and a spring, one end of the target object cooperates with the push rod and the other end abuts against the spring.

[0013] The mounting cylinder provides stable mounting for the target. The spring cooperates with the target to simulate the actual application conditions of the target, making the accuracy detection of the displacement sensor to be measured real and reliable.

[0014] In some embodiments, the measuring device further comprises: a force sensor, disposed adjacent to the push rod, configured to detect the force applied to the push rod to determine a reference zero position of the reference displacement sensor, wherein the reference zero position indicates that the spring begins to be compressed.

[0015] When the spring begins to compress, the target object begins to displace. At this point, the force value detected by the force sensor reaches a distinct inflection point. The displacement of the push rod measured by the reference displacement sensor at this point serves as the reference zero position, also the absolute zero position where the target object is about to begin to displace. This allows the displacement sensor under test and the reference displacement sensor to synchronously detect the displacement representing the actual displacement of the target object, ensuring accurate detection of the displacement sensor under test. This automatic calculation of the target's absolute zero position using the force sensor eliminates the need for pre-test adjustments, resulting in higher test accuracy and efficiency.

[0016] In some embodiments, in an initial state where the driving mechanism is not in operation, the push rod is spaced apart from the target object.

[0017] The push rod is spaced apart from the target object, which, on the one hand, prevents the push rod from being constantly subjected to force and affecting the accuracy of the drive mechanism; on the other hand, it can simulate the actual application conditions of the target object, such as simulating the idle stroke condition of the brake piston.

[0018] In some embodiments, a limit block is provided at the second end of the mounting tube, and the spring abuts between the limit block and the target object.

[0019] The limit block limits the spring. By adjusting the installation position, shape and size of the limit block, the preload force of the spring can also be adjusted to simulate and approach the actual application conditions of the target object.

[0020] In some embodiments, the limit block includes a first limit block with a fixed seat and a rod portion, and a second limit block slidably mounted on the rod portion; the spring includes a first spring mounted on the rod portion and limited between the fixed seat and the second limit block, and a second spring limited between the other end of the second limit block and the target object.

[0021] By cooperating with two limit blocks and two springs, the force exerted by the spring on the target object can be flexibly and accurately adjusted, thereby realistically simulating and approximating the actual application conditions of various target objects.

[0022] In some embodiments, the driving mechanism includes: a servo motor; an electric cylinder connected to the servo motor, and the output shaft of the electric cylinder serves as the push rod.

[0023] The use of servo motor + electric cylinder as the propulsion module can achieve high-precision drive, and the speed, distance, gradient, etc. of the displacement can be adjusted to achieve stable, accurate, and high-precision motion control of the target object, thereby ensuring accurate and comprehensive testing of the detection accuracy of the displacement sensor being tested.

[0024] In some embodiments, the reference displacement sensor and the servo motor are configured to be calibrated before testing.

[0025] The servo motor can record the displacement value, and the displacement value recorded by the servo motor is used to calibrate the displacement value with the displacement measured by the reference displacement sensor to eliminate installation deviations, product quality defects, and ensure accurate testing of the detection accuracy of the displacement sensor being tested.

[0026] In some embodiments, the measuring device further comprises: an electrical cabinet with a controller connected to the driving mechanism and the sensor assembly including the measured displacement sensor and the reference displacement sensor.

[0027] The electrical cabinet box can be integrated with a servo control unit to realize the control of the drive mechanism; the electrical cabinet box also collects and analyzes the detection data of the displacement sensor under test, the reference displacement sensor and the force sensor to realize the accuracy detection of the displacement sensor under test.

[0028] In some embodiments, the measuring device further comprises: a test bench with a test table and a mounting slot, the mounting mechanism, the spatial movement mechanism and the driving mechanism are all mounted on the test table, and the electrical cabinet box is arranged in the mounting slot.

[0029] In this way, a stable placement of the measuring device of the displacement sensor is achieved.

[0030] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0032] Figure 1 A schematic structural diagram of a displacement sensor measuring device according to an embodiment of the present application is shown; Figure 2 A schematic structural diagram of the space movement mechanism in an embodiment of the present application is shown; Figure 3A structural schematic diagram of the installation mechanism in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to make this application more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art.

[0034] The accompanying drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and thus repetitive descriptions thereof will be omitted. Some of the blocks shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0035] The terms "first", "second" and similar words used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components. The orientation or position relationship indicated by the terms "X-axis", "Y-axis", "Z-axis", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, in the description of this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements.

[0036] It should be noted that, unless there is any conflict, the embodiments of the present application and the features in different embodiments may be combined with each other.

[0037] Figure 1 The structure of the measuring device of the displacement sensor is shown schematically. Figure 2 The structure of the space moving mechanism is shown schematically. Figure 3 Show the structure of the installation mechanism; Figure 1 and Figure 3 As shown, the displacement sensor measuring device provided in the embodiment of the present application includes: The mounting mechanism 100 is for assembling the target object 600; The space moving mechanism 200 is provided for the displacement sensor to be measured (not shown, but may refer to Figure 3The displacement sensor to be measured is assembled at the installation position 660 ′), and the displacement sensor to be measured is configured to detect the displacement of the target object 600 ; The space moving mechanism 200 and the mounting mechanism 100 are arranged adjacent to each other so that the displacement sensor to be measured is arranged close to the target object 600; The driving mechanism 300 is configured to drive the target object 600 to move via the push rod 330 ; the reference displacement sensor 400 is disposed adjacent to the push rod 330 and is configured to detect the displacement of the push rod 330 .

[0038] The target object 600 is used to simulate or directly adopt the actual detection target of the displacement sensor to be measured. For example, the target object 600 can simulate a brake piston, or directly adopt a brake piston, and the displacement sensor to be measured is the displacement sensor of the brake piston. The displacement sensor to be measured is close to the target object 600 in spatial position so as to accurately detect the displacement of the target object 600. The mounting mechanism 100 and the spatial movement mechanism 200 respectively realize the stable installation of the target object 600 and the displacement sensor to be measured, and the spatial movement mechanism 200 also provides a spatial position adjustment function. In the process of the driving mechanism 300 driving the target object 600 to move through the push rod 330, the reference displacement sensor 400 detects the displacement of the push rod 330 (the measured displacement is used as a reference benchmark), and at the same time, the displacement sensor to be measured detects the displacement of the target object 600. By comparing the displacements measured by the two, the detection accuracy of the displacement sensor to be measured can be known. After one detection is completed, the detection dimension of the displacement sensor under test is changed by the spatial moving mechanism 200, and the driving mechanism 300 is started again for detection, thereby realizing the deviation verification of different spatial orientations of the displacement sensor under test, and then comprehensively testing the detection accuracy of the displacement sensor under test.

[0039] The specific detection principle of the displacement sensor for the displacement of target object 600 depends on the actual application conditions. For example, based on the properties of target object 600 (such as magnetism), the physical quantity (voltage, current, etc.) measured by the displacement sensor represents the displacement of target object 600. Specifically, the displacement sensor can be a Hall effect sensor. If target object 600 is ferromagnetic, the displacement sensor detects different magnetic field intensities as target object 600 moves to different positions. The displacement sensor converts the magnetic field into a voltage output representing the displacement of target object 600. The specific detection principle of the displacement sensor 400 for the displacement of push rod 330 is similar and will not be repeated here.

[0040] In some embodiments, the spatial motion mechanism 200 includes a three-axis motion mechanism and / or a rotational motion mechanism. The three-axis motion mechanism can achieve X / Y / Z axis movement of the displacement sensor under test, and the rotational motion mechanism can achieve Z axis rotation of the displacement sensor under test. This allows the displacement sensor under test to flexibly adjust its spatial position according to test requirements, increases the test dimension, and thus systematically and comprehensively tests the performance of the displacement sensor under test.

[0041] For example, in braking system applications, a gap exists between the brake piston and sleeve due to manufacturing tolerances. The displacement sensor (the brake piston's displacement sensor) can not only detect the displacement of target object 600 (the brake piston) along the X-axis, but also detect minute displacements of the brake piston along the Y and Z axes to verify the brake piston's manufacturing tolerances.

[0042] In some embodiments, the spatial movement mechanism 200 includes: a three-axis slide (210, 220, 230), including a Y-axis slide 210, an X-axis slide 220 mounted on the slider of the Y-axis slide 210, and a Z-axis slide 230 mounted on the slider of the X-axis slide 220; a rotating slide 240, mounted on the slider of the Z-axis slide 230, and the turntable of the rotating slide 240 can rotate around the Z-axis; wherein each slide is configured with an adjustment handle 250 and a locking handle 260.

[0043] The three-axis slide (210, 220, 230) facilitates X / Y / Z movement; the rotary slide 240 flexibly adjusts the position in the XY plane. The combination of the three-axis slide (210, 220, 230) and the rotary slide 240 enables comprehensive linear and angular positioning, allowing the displacement sensor under test to flexibly adjust its spatial position according to test requirements, increasing the test dimension and enabling systematic and comprehensive testing of the displacement sensor's performance. The slide's adjustment handle 250 allows for manual adjustment of the slider / turntable position, while the locking handle 260 is used to lock the slide, ensuring data accuracy during testing.

[0044] The X-axis slide 220, the Y-axis slide 210, and the Z-axis slide 230 can be driven by a screw nut, converting the rotation applied to their adjustment handles 250 into linear motion of the sliders. The locking handles 260 of the three-axis slides (210, 220, 230) can be connected to a wedge-shaped clamping block. When the locking handles 260 are tightened, the clamping block presses and locks the sliders to the base guide rails. The rotary slide 240 can be driven by a worm gear, converting the rotation applied to its adjustment handle 250 into rotary motion of the turntable. The locking handle 260 of the rotary slide 240 can be connected to a cam / wedge-shaped friction block. When the locking handles 260 are tightened, the friction block locks and secures the turntable.

[0045] In some embodiments, the mounting mechanism 100 includes: a hollow mounting tube 110, which provides an internal space for assembling the target object 600, and a push rod 330 extends into the internal space from the first end 110a of the mounting tube 110; a spring (121, 122), one end of the target object 600 cooperates with the push rod 330 and the other end abuts the spring (121, 122).

[0046] Mounting cylinder 110 provides stable assembly of target 600. Springs (121, 122) cooperate with target 600 to simulate the actual application conditions of target 600, ensuring a realistic and reliable accuracy test of the displacement sensor being measured. For example, in the application conditions of a braking system, a brake piston is equipped with a spring for reset.

[0047] In some embodiments, the measuring device further comprises: a force sensor 500, which is disposed adjacent to the push rod 330 and configured to detect the force applied to the push rod 330 to determine a reference zero position of the reference displacement sensor 400, wherein the reference zero position indicates that the spring (121, 122) begins to be compressed.

[0048] When springs (121, 122) begin to compress, target object 600 begins to displace. At this point, the force value detected by force sensor 500 has a distinct inflection point. The displacement of push rod 330 measured by reference displacement sensor 400 at this point is used as the reference zero position, which is also the absolute zero position at which target object 600 is about to begin to displace. This allows the displacement sensor under test and the reference displacement sensor 400 to synchronously detect the displacement representing the actual displacement of target object 600, ensuring accurate detection of the displacement sensor under test. In this way, the absolute zero position of target object 600 is automatically calculated using force sensor 500, eliminating the need for pre-test adjustments and improving test accuracy and efficiency.

[0049] In braking system applications, there's a period of idle travel between the moment the pedal is depressed and the spring compresses, initiating the effective travel of the brake piston. This idle travel is not included in the test travel of the brake piston's displacement sensor. Due to product design, this idle travel has a fixed applied force value, for example, 20N. Therefore, when testing the accuracy of the brake piston's displacement sensor, the displacement detected by the reference displacement sensor 400 when the force sensor 500 detects 20N can be used as the reference zero position, eliminating the need for manual adjustment and significantly improving test accuracy and efficiency.

[0050] In some embodiments, in the initial state when the driving mechanism 300 is not in operation, the push rod 330 is spaced apart from the target object 600. On the one hand, this prevents the push rod 330 from being constantly subjected to force and affecting the accuracy of the driving mechanism 300. On the other hand, it can simulate the actual application conditions of the target object 600, such as simulating the idle stroke condition of the brake piston.

[0051] In some embodiments, a limiting block (131, 132) is provided at the second end 110b of the mounting tube 110, and the spring (121, 122) abuts between the limiting block (131, 132) and the target object 600. The limiting block (131, 132) serves to limit the spring (121, 122), and by adjusting the installation position, shape, and size of the limiting block (131, 132), the preload force of the spring (121, 122) can also be adjusted to simulate and approximate the actual application conditions of the target object 600.

[0052] In some embodiments, the limit block (131, 132) includes a first limit block 131 with a fixed seat 131a and a rod portion 131b, and a second limit block 132 slidably mounted on the rod portion 131b; the spring (121, 122) includes a first spring 121 mounted on the rod portion 131b and limited between the fixed seat 131a and the second limit block 132, and a second spring 122 limited between the other end of the second limit block 132 and the target object 600.

[0053] The fixing seat 131a of the first limiting block 131 is fixed to the mounting tube 110, for example, by bolts. The second limiting block 132 is slidably mounted on the rod portion 131b of the first limiting block 131, and defines a space for the installation of the first spring 121 between the second limiting block 132 and the fixing seat 131a of the first limiting block 131. The other end of the second limiting block 132 provides a slot for the installation of the second spring 122, so that the second spring 122 abuts between the second limiting block 132 and the target object 600. By cooperating with the two limiting blocks (131, 132) and the two springs (121, 122), the force exerted by the springs (121, 122) on the target object 600 can be flexibly and accurately adjusted, thereby realistically simulating and approximating the actual application conditions of various target objects 600.

[0054] In some embodiments, drive mechanism 300 includes a servo motor 310 and an electric cylinder 320, with the output shaft of servo motor 310 and electric cylinder 320 connected to serve as push rod 330. Using servo motor 310 and electric cylinder 320 as a propulsion module enables high-precision drive, with adjustable displacement speed, distance, and gradient, enabling stable, accurate, and high-precision motion control of target object 600, thereby ensuring accurate and comprehensive testing of the displacement sensor's detection accuracy.

[0055] In some embodiments, the reference displacement sensor 400 and the servo motor 310 are configured for pre-test calibration. The servo motor 310 can record displacement values, and the displacement values ​​recorded by the servo motor 310 can be used to calibrate the two values ​​with the displacement values ​​measured by the reference displacement sensor 400 to eliminate defects such as installation deviations and product quality, thereby ensuring accurate testing of the detection accuracy of the displacement sensor under test.

[0056] For example, if the displacement value recorded by the servo motor 310 is not equal to the displacement measured by the reference displacement sensor 400, it is possible to check whether there are defects such as incorrect installation of the servo motor 310 / reference displacement sensor 400 or quality problems thereof. Until the displacement value recorded by the servo motor 310 is equal to the displacement measured by the reference displacement sensor 400, the accuracy test of the displacement sensor under test can be performed.

[0057] In some embodiments, the measuring device further includes an electrical cabinet 700 with a controller, connected to the drive mechanism 300 and the sensor assembly including the displacement sensor under test and the reference displacement sensor 400. The electrical cabinet 700 may include an integrated servo control unit to control the drive mechanism 300. The electrical cabinet 700 also collects and analyzes test data from the displacement sensor under test, the reference displacement sensor 400, and the force sensor 500 to verify the accuracy of the displacement sensor under test.

[0058] According to the testing needs, the electrical cabinet 700 can also integrate electronic components such as the operating unit, display screen 720, filter, current suppressor, encoder, etc. to realize the collection, processing, analysis, and visual output of the test data, thereby improving the testing efficiency.

[0059] In some embodiments, the measuring device further comprises a test bench with a test table 810 and a mounting slot 820. The mounting mechanism 100, the spatial movement mechanism 200, and the drive mechanism 300 are all mounted on the test table 810, and the electrical cabinet 700 is disposed in the mounting slot 820. This ensures a stable placement of the displacement sensor measuring device. The mounting mechanism 100, the spatial movement mechanism 200, and the drive mechanism 300 can each be mounted on the test table 810 using a suitable base / bracket.

[0060] The above content is a further detailed description of the present application in conjunction with specific preferred embodiments, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered to fall within the scope of protection of the present application.

Claims

1. A displacement sensor measuring device, characterized in that: include: Mounting mechanism for target object assembly; A spatial movement mechanism for assembling a displacement sensor to be measured, wherein the displacement sensor to be measured is configured to detect the displacement of the target object; Wherein, the spatial moving mechanism is arranged adjacent to the mounting mechanism so that the displacement sensor to be measured is arranged close to the target object; a driving mechanism, configured to drive the target object to move via a push rod; A reference displacement sensor is disposed adjacent to the push rod and is configured to detect a displacement of the push rod.

2. The measuring device according to claim 1, wherein The spatial movement mechanism includes a three-axis movement mechanism and / or a rotation movement mechanism.

3. The measuring device according to claim 2, wherein The space movement mechanism comprises: A three-axis slide, comprising a Y-axis slide, an X-axis slide mounted on a slider of the Y-axis slide, and a Z-axis slide mounted on a slider of the X-axis slide; A rotary slide is mounted on the slider of the Z-axis slide, and the turntable of the rotary slide can rotate around the Z-axis; Each slide is equipped with an adjustment handle and a locking handle.

4. The measuring device according to claim 1, wherein The mounting mechanism comprises: A hollow mounting cylinder provides an internal space for assembling the target object, and the push rod extends from a first end of the mounting cylinder into the internal space; A spring, one end of the target object cooperates with the push rod and the other end abuts against the spring.

5. The measuring device according to claim 4, wherein Also includes: The force sensor is disposed adjacent to the push rod and is configured to detect the force applied to the push rod to determine a reference zero position of the reference displacement sensor, wherein the reference zero position indicates that the spring begins to be compressed.

6. The measuring device according to claim 4, wherein In an initial state where the driving mechanism is not in operation, the push rod is spaced apart from the target object.

7. The measuring device according to claim 4, wherein A limiting block is provided at the second end of the mounting cylinder, and the spring abuts between the limiting block and the target object.

8. The measuring device according to claim 7, wherein The limiting block includes a first limiting block with a fixing seat and a rod portion, and a second limiting block slidably sleeved on the rod portion; The spring includes a first spring sleeved on the rod and limited between the fixing seat and the second limiting block, and a second spring limited between the other end of the second limiting block and the target object.

9. The measuring device according to claim 1, wherein The driving mechanism comprises: Servo motor; The electric cylinder is connected to the servo motor, and the output shaft of the electric cylinder serves as the push rod.

10. The measuring device according to claim 9, characterized in that The reference displacement sensor and the servo motor are configured to be calibrated before testing.

11. The measuring device according to any one of claims 1 to 10, characterized in that Also includes: An electrical cabinet box with a controller is connected to the driving mechanism and a sensor assembly including the measured displacement sensor and the reference displacement sensor.

12. The measuring device according to claim 11, wherein Also includes: A test bench with a test bench and a mounting slot, wherein the mounting mechanism, the spatial movement mechanism and the driving mechanism are all mounted on the test bench, and the electrical cabinet box is arranged in the mounting slot.

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