Measuring device of a displacement sensor

Abstract

The application relates to the technical field of automobile parts, and provides a measuring device of a displacement sensor, which comprises a mounting mechanism for assembling a target object, a space movement mechanism for assembling a measured displacement sensor, and a driving mechanism. The measured displacement sensor is configured to detect the displacement of the target object. The space movement mechanism is arranged close to the mounting mechanism, so that the measured displacement sensor is arranged close to the target object. The driving mechanism is configured to drive the target object to move through a push rod. A reference displacement sensor is arranged close to the push rod and is configured to detect the displacement of the push rod. The application can verify the deviation of the measured displacement sensor in different directions in space, and thus comprehensively test the detection precision of the measured displacement sensor.

Description

TECHNICAL FIELD

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

[0002] Displacement sensors have many applications in automobile parts. For example, the displacement sensor of the brake piston is used to detect the displacement of the brake piston, to provide position feedback for the brake control unit, and to ensure the reliable operation of the brake system.

[0003] The measuring device of the displacement sensor is used to detect the accuracy of the displacement sensor to ensure that the displacement sensor in use meets the accuracy standards. The current measuring device has a common problem that the measured displacement sensor can only detect single-axis displacement and cannot verify the deviation in different directions in space, and thus cannot comprehensively detect the accuracy of the measured displacement sensor.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The present application provides a measuring device of displacement sensor, which at least overcomes the problem that the current measuring device cannot verify the deviation in different directions in space, and thus cannot comprehensively detect the accuracy of the measured displacement sensor.

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

[0007] The target is used to simulate or directly adopt the actual detection target of the measured displacement sensor. The measured displacement sensor is arranged adjacent to the target in space so as to accurately detect the displacement of the target. The mounting mechanism and the spatial movement mechanism are respectively arranged to stably mount the target and the measured displacement sensor, and the spatial movement mechanism further provides a spatial position adjustment function. In the process that the driving mechanism drives the target to move through the push rod, the reference displacement sensor detects the displacement of the push rod (the measured displacement is taken as a reference datum), and the measured displacement sensor detects the displacement of the target. By comparing the measured displacement of the two, the detection accuracy of the measured displacement sensor can be obtained. After one detection is completed, the spatial movement mechanism is used to change the detection dimension of the measured displacement sensor, and the driving mechanism is started again for detection. In this way, the deviation of the measured displacement sensor in different spatial directions can be verified, and the detection accuracy of the measured displacement sensor can be comprehensively tested.

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

[0009] The three-axis movement mechanism can realize the movement of the measured displacement sensor in X / Y / Z three axes, and the rotary movement mechanism can realize the rotation of the measured displacement sensor around the Z axis. In this way, the spatial position of the measured displacement sensor can be flexibly adjusted according to the test requirement, the test dimension is increased, and the performance of the measured displacement sensor can be comprehensively and systematically tested.

[0010] In some embodiments, the spatial movement mechanism comprises a three-axis sliding table, a rotary sliding table, and a mounting mechanism. The three-axis sliding table comprises a Y-axis sliding table, an X-axis sliding table mounted on a sliding block of the Y-axis sliding table, and a Z-axis sliding table mounted on a sliding block of the X-axis sliding table. The rotary sliding table is mounted on a sliding block of the Z-axis sliding table, and a rotating table of the rotary sliding table can rotate around the Z axis. The mounting mechanism comprises a hollow mounting cylinder, a spring, and a push rod. The mounting cylinder provides an internal space for assembling the target, and the push rod extends into the internal space from a first end of the mounting cylinder. One end of the target is matched with the push rod, and the other end of the target abuts against the spring.

[0011] The three-axis sliding table can conveniently realize the movement in X / Y / Z three axes, and the rotary sliding table can flexibly realize the position adjustment in the XY plane. The combination of the three-axis sliding table and the rotary sliding table can realize comprehensive linear positioning and angular positioning, so that the spatial position of the measured displacement sensor can be flexibly adjusted according to the test requirement, the test dimension is increased, and the performance of the measured displacement sensor can be comprehensively and systematically tested. The adjustment handle of the sliding table is used for manually adjusting the position of the sliding block / rotating table, and the locking handle is used for locking the sliding table, so as to ensure the accuracy of the data in the test process.

[0012] In some embodiments, the mounting mechanism comprises a hollow mounting cylinder, a spring, and a push rod. The mounting cylinder provides an internal space for assembling the target, and the push rod extends into the internal space from a first end of the mounting cylinder. One end of the target is matched with the push rod, and the other end of the target abuts against the spring.

[0013] The mounting cylinder is used for stably assembling the target object. The spring is matched with the target object, and is used for simulating the actual application working condition of the target object, so that the precision detection of the measured displacement sensor is true and reliable.

[0014] In some embodiments, the measuring device further comprises a force sensor arranged adjacent to the push rod and configured to detect the force of the push rod to determine a reference zero position of the reference displacement sensor, the reference zero position representing the start of compression of the spring.

[0015] When the spring starts to compress, the target object starts to displace, and at this time, the force value detected by the force sensor has a clear inflection point. The displacement amount of the push rod measured by the reference displacement sensor at this time is taken as the reference zero position, which is also the absolute zero position at which the target object is about to start to displace. The measured displacement sensor and the reference displacement sensor are synchronized to detect the displacement amount representing the actual displacement of the target object, so as to ensure the accuracy of the precision detection of the measured displacement sensor. In this way, the absolute zero position of the target object is automatically calculated by using the force sensor, without the need for adjustment before testing, and the testing accuracy and efficiency are higher.

[0016] In some embodiments, in the initial state in which the driving mechanism is not operated, 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 avoids affecting the precision of the driving mechanism due to the fact that the push rod is always under force, and on the other hand can simulate the actual application working condition of the target object, for example, simulating the idle stroke working condition of a brake piston.

[0018] In some embodiments, a limiting block is arranged at the second end of the mounting cylinder, and the spring is abutted between the limiting block and the target object.

[0019] The limiting block limits the spring, and by adjusting the installation position, shape and size of the limiting block, the pre-tightening force of the spring can also be adjusted to simulate and approximate the actual application working condition of the target object.

[0020] In some embodiments, the limiting block comprises a first limiting block comprising a fixed seat and a rod portion, and a second limiting block slidably sleeved on the rod portion; the spring comprises a first spring sleeved on the rod portion and limited between the fixed seat and the second limiting block, and a second spring limited between the other end of the second limiting block and the target object.

[0021] By means of the two limiting blocks and the two springs, the force of the spring acting on the target object can be flexibly and accurately adjusted, so as to truly simulate and approximate the actual application working condition of various target objects.

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

[0023] The servo motor and the electric cylinder are used as the propulsion module, high-precision driving can be realized, and the speed, distance, gradient, etc. of displacement can be adjusted, so as to realize stable, accurate and high-precision motion control of the target object, and further ensure accurate and comprehensive testing of the detection accuracy of the measured displacement sensor.

[0024] In some embodiments, the reference displacement sensor and the servo motor are configured to perform pre-test calibration.

[0025] The servo motor can record the displacement value, and the servo motor recorded displacement value and the displacement value measured by the reference displacement sensor are calibrated to eliminate installation deviation, product quality and other defects, and ensure accurate testing of the detection accuracy of the measured displacement sensor.

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

[0027] The electric cabinet can integrate a servo control unit to control the driving mechanism, and the electric cabinet can also collect and analyze the detection data of the measured displacement sensor, the reference displacement sensor and the force sensor to realize precision detection of the measured displacement sensor.

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

[0029] In this way, the measuring device of the displacement sensor is stably placed.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings incorporated into the specification and forming a part thereof, 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 other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0032] Figure 1 The structure of the measuring device of the displacement sensor in the embodiment of the present application is shown in the structure diagram;

[0033] Figure 2 The structure of the spatial movement mechanism in the embodiment of the present application is shown in the structure diagram;

[0034] Figure 3 A structural schematic diagram of the mounting mechanism in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0035] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0036] The accompanying drawings are included to provide a further understanding of principles of embodiments and no limitations on the present application are intended to be derived therefrom. Like reference numerals refer to like elements in the drawings and descriptions.

[0037] The use of "first", "second", and other similar references in the detailed description is not intended to denote any order, quantity, or importance, but is merely to distinguish one component from another. The terms "X-axis", "Y-axis", "Z-axis", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be a fixed connection, or 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 internal communication between two elements.

[0038] It should be noted that the features of the embodiments of the present application and the features in different embodiments can be combined with each other without conflict.

[0039] Figure 1 A structure of a measurement device of a displacement sensor is shown, Figure 2 A structure of a spatial movement mechanism is shown, Figure 3 A structure of a mounting mechanism is shown; in combination Figure 1 And Figure 3 As shown in the figure, the measurement device of the displacement sensor provided by the embodiment of the present application comprises:

[0040] The mounting mechanism 100 is used for assembling the target object 600.

[0041] The spatial movement mechanism 200 is used for assembling the measured displacement sensor (not shown, and can be referred to as the measured displacement sensor 660' in the figure) which is configured to detect the displacement of the target object 600. Figure 3 The spatial movement mechanism 200 is used for assembling the measured displacement sensor (not shown, and can be referred to as the measured displacement sensor 660' in the figure) which is configured to detect the displacement of the target object 600.

[0042] The spatial movement mechanism 200 is used for assembling the measured displacement sensor (not shown, and can be referred to as the measured displacement sensor 660' in the figure) which is configured to detect the displacement of the target object 600.

[0043] The driving mechanism 300 is configured to drive the target object 600 to move through the push rod 330. The reference displacement sensor 400 is arranged adjacent to the push rod 330 and is configured to detect the displacement of the push rod 330.

[0044] The target object 600 is used for simulating or directly adopting the actual detection target of the measured displacement sensor. For example, the target object 600 can simulate a brake piston, or directly adopt the brake piston, and the measured displacement sensor is a displacement sensor of the brake piston. The measured displacement sensor is arranged adjacent to the spatial position of the target object 600, 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 mounting of the target object 600 and the measured displacement sensor, and the spatial movement mechanism 200 also provides the spatial position adjustment function. In the process of driving the target object 600 to move by the driving mechanism 300 through the push rod 330, the reference displacement sensor 400 detects the displacement of the push rod 330 (the measured displacement amount is used as a reference datum), and the measured displacement sensor detects the displacement of the target object 600. By comparing the measured displacement amounts of the two, the detection accuracy of the measured displacement sensor can be obtained. After one detection is completed, the detection dimension of the measured displacement sensor is changed by the spatial movement mechanism 200, and the driving mechanism 300 is started again for detection, so that the deviation verification of the measured displacement sensor in different spatial directions is realized, and the detection accuracy of the measured displacement sensor is comprehensively tested.

[0045] The specific detection principle of the measured displacement sensor on the displacement of the target object 600 is determined according to the actual application condition. For example, based on the attribute (magnetic property, etc.) of the target object 600, the physical quantity (voltage, current, etc.) measured by the measured displacement sensor represents the displacement amount of the target object 600. Specifically, the measured displacement sensor can adopt a Hall effect sensor, the target object 600 is a ferromagnetic target object, when the target object 600 moves to different positions, the magnetic field strength detected by the measured displacement sensor is different, the measured displacement sensor converts the magnetic field into voltage output, which represents the displacement amount of the target object 600. The specific detection principle of the reference displacement sensor 400 on the displacement of the push rod 330 is the same, and will not be repeated.

[0046] In some embodiments, the spatial movement mechanism 200 comprises a three-axis movement mechanism and / or a rotary movement mechanism. The three-axis movement mechanism can realize the movement of the measured displacement sensor in X / Y / Z three axes, and the rotary movement mechanism can realize the rotation of the measured displacement sensor around the Z axis, so that the measured displacement sensor can be flexibly adjusted in space according to the test needs, the test dimension is increased, and the performance of the measured displacement sensor is tested systematically and comprehensively.

[0047] For example, in the application working condition of the brake system, there is a gap between the brake piston and the sleeve due to manufacturing tolerances. The measured displacement sensor (displacement sensor of the brake piston) can detect not only the displacement of the target object 600 (brake piston) along the X axis, but also the slight displacement of the brake piston in the Y and Z axes, so as to verify the manufacturing tolerance of the brake piston.

[0048] In some embodiments, the spatial movement mechanism 200 comprises a three-axis sliding table (210, 220, 230) comprising a Y-axis sliding table 210, an X-axis sliding table 220 mounted on the sliding block of the Y-axis sliding table 210, and a Z-axis sliding table 230 mounted on the sliding block of the X-axis sliding table 220; a rotary sliding table 240 mounted on the sliding block of the Z-axis sliding table 230, and the rotating table of the rotary sliding table 240 can rotate around the Z axis; wherein each sliding table is provided with an adjusting handle 250 and a locking handle 260.

[0049] The three-axis sliding table (210, 220, 230) can conveniently realize the movement in X / Y / Z three axes, and the rotary sliding table 240 can flexibly realize the position adjustment in the XY plane. The combination of the three-axis sliding table (210, 220, 230) and the rotary sliding table 240 can realize comprehensive linear positioning and angular positioning, so that the measured displacement sensor can be flexibly adjusted in space according to the test needs, the test dimension is increased, and the performance of the measured displacement sensor is tested systematically and comprehensively. The adjusting handle 250 of the sliding table is used for manually adjusting the position of the sliding block / rotating table, and the locking handle 260 is used for locking the sliding table to ensure the accuracy of the data in the test process.

[0050] The X-axis sliding table 220, the Y-axis sliding table 210 and the Z-axis sliding table 230 can convert the rotation applied at the adjusting handle 250 into linear motion of the sliding block based on the screw nut transmission; the locking handle 260 of the three-axis sliding table (210, 220, 230) can be connected with a wedge-shaped compression block, and when the locking handle 260 is tightened, the compression block compresses and locks the sliding block and the base rail. The rotary sliding table 240 can convert the rotation applied at the adjusting handle 250 into rotary motion of the rotating table based on the worm gear transmission; the locking handle 260 of the rotary sliding table 240 can be connected with a cam / wedge-shaped friction block, and when the locking handle 260 is tightened, the friction block locks and fixes the rotating table.

[0051] In some embodiments, the mounting mechanism 100 comprises: a hollow mounting cylinder 110, providing an inner space for the target object 600 to fit in, and a push rod 330 extending into the inner space from a first end 110a of the mounting cylinder 110; and a spring (121, 122), one end of which is matched with the push rod 330 and the other end of which abuts against the spring (121, 122).

[0052] The mounting cylinder 110 is used for stably fitting the target object 600. The spring (121, 122) is matched with the target object 600 and is used for simulating the actual application working condition of the target object 600, so as to make the precision detection of the measured displacement sensor true and reliable. For example, in the application working condition of the brake system, the brake piston is provided with a spring for resetting.

[0053] In some embodiments, the measuring device further comprises: a force sensor 500, which is arranged close to the push rod 330 and is configured to detect the force of the push rod 330, so as to determine the reference zero position of the reference displacement sensor 400, the reference zero position representing the start of compression of the spring (121, 122).

[0054] When the spring (121, 122) starts to compress, the target object 600 starts to produce displacement. At this time, the force value detected by the force sensor 500 will have a clear inflection point. The displacement amount of the push rod 330 measured by the reference displacement sensor 400 at this time is taken as the reference zero position, which is also the absolute zero position at which the target object 600 is about to start to produce displacement. This makes the measured displacement sensor and the reference displacement sensor 400 synchronously detect the displacement amount representing the actual displacement of the target object 600, so as to ensure the accuracy of the precision detection of the measured displacement sensor. In this way, the absolute zero position of the target object 600 is automatically calculated by the force sensor 500, without the need for manual adjustment before testing, and the testing accuracy and efficiency are higher.

[0055] In the application working condition of the brake system, before the effective stroke of the brake piston starts after the compression of the spring, there is an idle stroke, which is not included in the test stroke of the displacement sensor of the brake piston. According to the product design, the idle stroke has a fixed force value, for example, 20N. Therefore, when testing the detection accuracy of the displacement sensor of the brake piston, the displacement amount detected by the reference displacement sensor 400 when the force sensor 500 detects 20N can be taken as the reference zero position, without the need for manual adjustment, which significantly improves the testing accuracy and efficiency.

[0056] In some embodiments, in the initial state in which the driving mechanism 300 is not running, the push rod 330 is spaced apart from the target object 600. On the one hand, this avoids the push rod 330 being always under stress, which affects the accuracy of the driving mechanism 300. On the other hand, this can simulate the actual application working condition of the target object 600, for example, simulate the idle stroke working condition of the brake piston.

[0057] In some embodiments, the second end 110b of the mounting cylinder 110 is provided with a limiting block (131, 132), and the spring (121, 122) abuts between the limiting block (131, 132) and the target object 600. The limiting block (131, 132) limits the spring (121, 122), and by adjusting the installation position, shape and size of the limiting block (131, 132), the pre-tightening force of the spring (121, 122) can also be adjusted to simulate and approximate the actual application working condition of the target object 600.

[0058] In some embodiments, the limiting block (131, 132) includes a first limiting block 131 with a fixed seat 131a and a rod part 131b, and a second limiting block 132 slidingly sleeved on the rod part 131b; and the spring (121, 122) includes a first spring 121 sleeved on the rod part 131b and limited between the fixed seat 131a and the second limiting block 132, and a second spring 122 limited between the other end of the second limiting block 132 and the target object 600.

[0059] The fixed seat 131a of the first limiting block 131 is fixed with the mounting cylinder 110, for example, can be fixed by bolts. The second limiting block 132 is slidingly sleeved on the rod part 131b of the first limiting block 131, and limits a space for installing the first spring 121 between the fixed seat 131a of the first limiting block 131. The other end of the second limiting block 132 provides a slot hole for installing the second spring 122, so that the second spring 122 abuts between the second limiting block 132 and the target object 600. Through the cooperation of the two limiting blocks (131, 132) and the two springs (121, 122), the force of the spring (121, 122) on the target object 600 can be flexibly and accurately adjusted, so as to truly simulate and approximate the actual application working condition of various target objects 600.

[0060] In some embodiments, the driving mechanism 300 includes a servo motor 310 and an electric cylinder 320 connected to the servo motor 310, and the output shaft of the electric cylinder 320 is used as a push rod 330. The servo motor 310 and the electric cylinder 320 are used as a propulsion module, which can realize high-precision driving, and the speed, distance and gradient of displacement can be adjusted, so as to realize stable, accurate and high-precision motion control of the target object 600, and further ensure accurate and comprehensive testing of the detection accuracy of the measured displacement sensor.

[0061] In some embodiments, the reference displacement sensor 400 and the servo motor 310 are configured to be calibrated before testing. The servo motor 310 can record the displacement value, and the servo motor 310 records the displacement value and the displacement value measured by the reference displacement sensor 400 to calibrate the two, eliminate installation deviation, product quality and other defects, and ensure accurate testing of the detection accuracy of the measured displacement sensor.

[0062] For example, if the displacement value recorded by the servo motor 310 is not equal to the displacement value measured by the reference displacement sensor 400, it can be checked whether there is a defect such as installation error of the servo motor 310 / reference displacement sensor 400, quality problem, etc., until the displacement value recorded by the servo motor 310 is equal to the displacement value measured by the reference displacement sensor 400, and then the precision test of the measured displacement sensor is performed.

[0063] In some embodiments, the measuring device further comprises an electric cabinet 700 with a controller, connected with the driving mechanism 300 and the sensor assembly comprising the measured displacement sensor and the reference displacement sensor 400. The electric cabinet 700 can integrate a servo control unit to realize the control of the driving mechanism 300; the electric cabinet 700 also collects and analyzes the detection data of the measured displacement sensor, the reference displacement sensor 400 and the force sensor 500 to realize the precision detection of the measured displacement sensor.

[0064] According to the detection needs, the electric cabinet 700 can also integrate an operation unit, a display screen 720, a filter, a current suppressor, an encoder and other electronic components to realize the collection, processing, analysis and visual output of the detection data, thereby improving the test efficiency.

[0065] In some embodiments, the measuring device further comprises a test bench 810 with a test slot 820, the mounting mechanism 100, the spatial movement mechanism 200 and the driving mechanism 300 are mounted on the test bench 810, and the electric cabinet 700 is arranged in the test slot 820. In this way, the stable placement of the measuring device of the displacement sensor is realized. The mounting mechanism 100, the spatial movement mechanism 200 and the driving mechanism 300 can be respectively mounted on the test bench 810 through a suitable base / support, etc.

[0066] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or replacements can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A measuring device for a displacement sensor, characterized in that, include: Installation mechanism for assembling the target object; A spatial movement mechanism for assembling a displacement sensor under test, the displacement sensor being configured to detect the displacement of the target object; The spatial movement mechanism is positioned adjacent to the mounting mechanism to bring the displacement sensor under test closer to the target object; the spatial movement mechanism is configured to change the spatial position of the displacement sensor under test after one detection is completed, thereby changing the detection dimension of the displacement sensor under test. The drive mechanism is configured to drive the target object to move via a push rod; A reference displacement sensor is located near the push rod and is configured to detect the displacement of the push rod; A hollow mounting cylinder provides an internal space for assembling the target object, and the push rod extends into the internal space from the first end of the mounting cylinder; A spring, one end of the target object engages with the push rod and the other end abuts against the spring; A force sensor, located near the push rod, is configured to detect the force applied to the push rod to determine the reference zero position of the reference displacement sensor, so that the measured displacement sensor and the reference displacement sensor synchronously detect the displacement amount characterizing the actual displacement of the target object based on the reference zero position; wherein, the reference zero position characterizes the start of spring compression.

2. The measuring device as described in claim 1, characterized in that, The spatial movement mechanism includes a three-axis movement mechanism and / or a rotary movement mechanism.

3. The measuring device as described in claim 2, characterized in that, The space mobility mechanism includes: The three-axis slide table includes a Y-axis slide table, an X-axis slide table mounted on a slider of the Y-axis slide table, and a Z-axis slide table mounted on a slider of the X-axis slide table. 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 as described in claim 1, characterized in that, In the initial state where the drive mechanism is not in operation, the push rod is spaced apart from the target object.

5. The measuring device as described in claim 1, characterized in that, The second end of the mounting cylinder is provided with a limit block, and the spring abuts against the limit block and the target object.

6. The measuring device as described in claim 5, characterized in that, The limiting block includes a first limiting block with a fixed seat and a rod, and a second limiting block that is slidably sleeved on the rod; The spring includes a first spring sleeved on the rod portion and limited between the fixed base and the second limiting block, and a second spring limited between the other end of the second limiting block and the target object.

7. The measuring device as described in claim 1, characterized in that, The drive mechanism includes: Servo motor; An electric cylinder is connected to the servo motor, and the output shaft of the electric cylinder serves as the push rod.

8. The measuring device as described in claim 7, characterized in that, The reference displacement sensor and the servo motor are configured for pre-test calibration.

9. The measuring device as described in any one of claims 1 to 8, characterized in that, Also includes: An electrical cabinet with a controller is connected to the drive mechanism and a sensor assembly including the measured displacement sensor and the reference displacement sensor.

10. The measuring device as described in claim 9, characterized in that, Also includes: A test stand frame with a test bench and a mounting slot, wherein the mounting mechanism, the spatial movement mechanism and the drive mechanism are all mounted on the test bench, and the electrical cabinet is disposed in the mounting slot.

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