A high-precision high-repeatability rigid displacement measuring device

Abstract

The application belongs to the technical field of precision measurement, and particularly relates to a high-precision and high-repeatability rigid displacement measuring device. The device comprises a coarse adjustment displacement mechanism, a fine adjustment displacement mechanism, a plurality of displacement sensors and a fixing mechanism for fixing a measured piece. The coarse and fine adjustment mechanisms are cooperated to realize the fast overall positioning and independent fine adjustment of the multiple sensors, and a turntable mechanism is integrated to simulate different working angles, so that the efficiency, precision and repeatability of the displacement measurement of multiple measuring points are significantly improved, and the device is particularly suitable for the dynamic deformation detection of complex structural pieces such as automobile brake calipers.

Description

Technical Field

[0001] This invention belongs to the field of precision measurement technology, specifically relating to a high-precision, highly repeatable rigid displacement measuring device. Background Technology

[0002] This invention belongs to the field of precision measurement technology, specifically relating to a high-precision, high-repeatability measuring device for rigid displacement (elastic or plastic deformation) of mechanical components under load, particularly suitable for the research, development, testing, and quality inspection of complex structural components such as automotive brake calipers. Currently, contact displacement measurement remains the mainstream method in this field. Its typical implementation involves using a magnetic base to hold a displacement sensor (such as a dial indicator, micrometer, or linear variable differential transformer probe), which is magnetically attached to a nearby base. The operator manually adjusts the sensor's position and angle to bring the sensor probe into contact with the surface of the workpiece for measurement.

[0003] However, this traditional method, relying on magnetic bases and manual adjustments, has a series of inherent technical drawbacks. First, its positioning depends entirely on the operator's experience and visual judgment, making it difficult to ensure consistent sensor contact posture and preload at each measurement point, resulting in poor repeatability and significant human error. Second, when simultaneously monitoring multiple measurement points on a complex component, adjusting and fixing multiple independent magnetic bases individually is extremely cumbersome and time-consuming, and often fails to achieve an ideal sensor layout due to spatial interference, leading to low measurement efficiency. Furthermore, the magnetic bases and the resulting cantilever structure lack rigidity, making them prone to slight slippage or wobbling under vibration or the reaction force of the measured component, causing unstable measurement references and poor data reliability. In addition, this method is functionally limited, making it difficult to integrate a stable attitude adjustment mechanism to simulate different angles of the measured component during actual installation, and it lacks the ability to maintain structural stability and reliable fixation in environmental tests such as high and low temperatures, limiting its adaptability to various operating conditions.

[0004] In summary, existing magnetic base-based measurement methods suffer from significant shortcomings in efficiency, accuracy, repeatability, stability, and adaptability to complex working conditions, becoming a technical bottleneck restricting the efficient, accurate, and automated detection of critical components. Therefore, there is an urgent need for an integrated displacement measurement device to address these issues. Summary of the Invention

[0005] The purpose of this invention is to provide a displacement measuring device that integrates multi-axis precision guide rails and locking mechanisms to replace the traditional magnetic gauge holder clamping method that relies on manual adjustment, thereby achieving rapid, accurate and highly repeatable measurement of multi-point displacement on the surface of brake calipers and other complex vehicle mechanical components.

[0006] A high-precision, highly repeatable rigid displacement measuring device includes:

[0007] The device includes a coarse adjustment displacement mechanism, a fine adjustment displacement mechanism, several displacement sensors, and a fixing mechanism for fixing the workpiece under test.

[0008] The fixing mechanism is used to install and fix the test piece;

[0009] The coarse adjustment displacement mechanism and the fine adjustment displacement mechanism are connected and used to drive each displacement sensor to move in the horizontal and vertical directions, so that each displacement sensor is respectively attached to each measurement point on the surface or inside of the workpiece being measured.

[0010] When the workpiece is in operation, each displacement sensor detects the displacement changes at its corresponding measurement point in real time and transmits the detected displacement data to an external analysis device for analysis and processing. By setting up a structure that combines coarse and fine adjustment displacement mechanisms, rapid preliminary positioning and independent fine adjustment of multiple displacement sensors are achieved. This effectively solves the technical problems of difficulty in synchronous adjustment of multiple measurement points, low positioning efficiency, and susceptibility to human error in existing technologies, significantly improving the adjustment efficiency and positioning accuracy of the measuring device. A fixed mechanism is used specifically for mounting the workpiece, combined with an adjustment mechanism that drives the displacement sensors to move laterally and vertically. This allows multiple displacement sensors to accurately and stably conform to different measurement points on or inside the workpiece surface, ensuring the uniformity of the measurement reference and the reliability of the measurement contact, thereby improving the consistency and repeatability of displacement measurements. By arranging displacement sensors at each measurement point and performing real-time detection, synchronous and dynamic monitoring of the displacement changes at multiple positions of the workpiece in operation is achieved. This provides a complete data source for comprehensive analysis of its deformation or displacement distribution, overcoming the limitations of insufficient representativeness in single-point measurements and enhancing the comprehensiveness and analytical accuracy of the measurement results. The overall structure is rationally laid out with clear functional modules, which facilitates quick assembly and measurement by operators and integration with external analysis devices. It realizes semi-automation of the measurement process and real-time data output, thereby improving the engineering applicability of the device.

[0011] Optionally, the coarse adjustment displacement mechanism includes a tooling base plate, a slide rail on the tooling base plate, and a first transverse plate slidably connected on the slide rail;

[0012] A supporting base plate is installed on the first horizontal plate, and supporting upright plates are respectively provided on both sides of the supporting base plate along its width direction;

[0013] A graduated guide block is provided between the two supporting uprights, and at least one first tension block is slidably connected to the guide block;

[0014] The first tensioning block has a tensioning opening, within which the fine-tuning displacement mechanism is installed, achieving initial positioning through the first tensioning block. A stable and precisely guided lateral moving pair is formed by a tooling base plate with a sliding rail and a first transverse plate, providing the displacement sensor with a wide range of smooth lateral coarse adjustment capabilities. This effectively overcomes the technical defects of large sway and ambiguous positioning inherent in manually moving the sensor, significantly improving the efficiency and operational stability of initial positioning. A structure employing a supporting base plate and two supporting uprights on both sides creates a rigid and reliable support frame, ensuring the stability of the mounting reference surface for the guide block and its load-bearing components. This effectively suppresses errors that may be introduced during measurement due to deformation of the support structure, providing a solid structural foundation for high-precision measurement. By setting a graduated guide block that forms a sliding connection with the first tensioning block, an intuitive and quantifiable longitudinal (or another dimension) coarse adjustment reference is provided for the installation of the fine-tuning displacement mechanism. Operators can perform rapid and repeatable initial positioning based on the graduations, improving the consistency and operability of multi-sensor array arrangements. By setting a tensioning port on the first tensioning block to install the fine-tuning displacement mechanism and using the first tensioning block to achieve its initial positioning, a "coarse-fine adjustment" connection structure is creatively constructed. This structure not only ensures the temporary fixation of the fine-tuning mechanism after coarse adjustment, preventing its accidental displacement, but also reserves operating space and degrees of freedom for subsequent independent fine-tuning, realizing the effective coordination of the two-stage adjustment mechanism.

[0015] Furthermore, it also includes a turntable mechanism; the turntable mechanism includes a transfer plate and a rocker arm, the rocker arm being used to drive the transfer plate to rotate around its own axis; the two wide sides of the fixture base plate are clamped and fixed by the transfer plate; when the operator rotates the rocker arm, the transfer plate drives the fixing mechanism, displacement sensor, and the workpiece mounted on the fixing mechanism to rotate synchronously around the axis of the transfer plate. By setting up a turntable mechanism composed of a transfer plate and a rocker arm, and clamping and fixing the two wide sides of the fixture base plate by the transfer plate, the entire measuring device (including the fixing mechanism, displacement sensor, and workpiece) can be rotated as a whole around a fixed axis. This structure creatively simulates the working state of the workpiece at different angles in actual working conditions, enabling displacement measurement to be performed in a posture closer to the real working environment, effectively overcoming the technical bottleneck of traditional measurement that cannot reflect the displacement characteristics under actual complex stress conditions due to fixed posture, and significantly improving the engineering guidance value and application reliability of the measurement data. The use of a rocker arm to drive the rotation of the transfer plate provides a stable and labor-saving operation method, making it easy for the operator to accurately control the rotation angle. Especially when the turntable mechanism is preferably a worm gear structure, its large transmission ratio and compact structure enable precise adjustment of minute angles and reliable locking of arbitrary angles. This effectively prevents unexpected deflection caused by the device's own shaking or force during measurement, ensuring the stability of the measured part's posture at the set angle. This, in turn, guarantees high repeatability and high reliability of the displacement measurement process. By driving the entire measurement platform to rotate synchronously, rather than rotating the measured part individually, the relative position and contact state between all displacement sensors and each measurement point on the measured part are strictly maintained during rotation. This "overall linkage" design avoids the cumbersome steps of repositioning sensors, making it possible to perform continuous comparative measurements at multiple angles and under multiple working conditions on the same measured part. This greatly improves measurement efficiency and provides a convenient and reliable technical means for studying the displacement variation law of the measured part under different spatial postures.

[0016] A high-precision, highly repeatable rigid displacement measuring device, wherein the first tension block is provided with a third locking port and a fourth locking port;

[0017] The axis of the third locking port is parallel to the length direction of the top surface of the guide block, and the axis of the fourth locking port is parallel to the width direction of the top surface of the guide block.

[0018] A first handle is located at the bottom edge of the first transverse plate. When the first handle is tightened, the position of the first transverse plate relative to the slide rail is fixed, preventing further movement along the slide rail. The fourth locking port, when the external screw is tightened, can fix the position of the fine-tuning mechanism; the third locking port, when the external screw is tightened, can fix the position of the first tensioning block on the guide block. This modular locking design avoids the high cost and debugging difficulties associated with using a single, complex locking mechanism. While ensuring reliable locking functionality, it simplifies the overall structure and improves the practicality and ease of maintenance of the device.

[0019] By setting a first handle at the bottom edge of the first transverse plate and directly linking its tightening operation to the fixation of the first transverse plate relative to the slide rail, a one-click quick locking of the transverse coarse adjustment component is achieved. This structure can convert the sliding pair on the slide rail into a fixed connection, thereby effectively eliminating the risk of macroscopic displacement of the upper component along the slide rail during subsequent fine adjustment or measurement. As a result, the rigidity and anti-interference capability of the overall coarse adjustment displacement mechanism are enhanced, providing a stable foundation platform for the entire measurement system and becoming one of the key structural measures to ensure high-precision and high-repeatability measurements.

[0020] A high-precision, highly repeatable rigid displacement measuring device includes a fine-tuning displacement mechanism comprising at least one transverse block. A second tension block is fixedly connected to the end of a displacement sensor. The second tension block has a first locking port, which is vertically oriented, and a displacement fixing block is installed within the first locking port. The displacement fixing block has a through hole, which is horizontally oriented, and the displacement sensor passes through the through hole. The transverse block is used to adjust the transverse distance between the second tension block, the displacement sensor, and the measured object. The second tension block is mainly used to adjust the height of the displacement fixing block, and the displacement fixing block can also move laterally within the through hole. When the first locking port is locked by an external screw, the height of the displacement fixing block is fixed. Simultaneously, the horizontally oriented through hole on the displacement fixing block allows the displacement sensor to slide laterally within it, providing the sensor end with the ability to perform a final micro-alignment in the horizontal plane. This fine-tuning mechanism, with its decoupled transverse and vertical orientation, allows the operator to guide the sensor end to the predetermined measurement point with extremely high precision. The transverse block may also have scale lines on its surface for easy visual identification. The side of the displacement fixing block can also be marked with scales for easy human visual identification.

[0021] Furthermore, in the high-precision, high-repeatability rigid displacement measuring device, the second tension block is a bent block structure, including a vertically extending vertical block and a horizontal block extending horizontally from the side of the vertical block toward the workpiece being measured.

[0022] The vertical block is provided with a second locking port;

[0023] A tensioning sleeve is installed between the through hole and the displacement sensor. When the bolt of the tensioning sleeve is tightened, the tensioning sleeve generates a radial clamping force, fixing the displacement sensor in the through hole. A lateral sliding pair is provided on the surface of the transverse block, allowing for fine lateral position adjustment of the entire second tensioning block in this direction. In conjunction with a second locking port provided on the vertical block, when the locking port is tightened by an external screw, a strong clamping force is generated, instantly and rigidly fixing the relative position of the second tensioning block and the lower transverse plate. This mechanism enables precise fine-tuning and secure locking of the sensor assembly in the horizontal plane, ensuring the accuracy and anti-interference capability of the sensor's final horizontal positioning, which is a key factor in achieving high repeatability measurements. By employing an independent tensioning sleeve structure and having it act on the displacement sensor within the through hole, a two-state rapid clamping mechanism was designed. When the tensioning sleeve nut is loose, the displacement sensor can slide easily within the through hole, facilitating initial axial alignment or insertion into the hole of the workpiece. When the tensioning sleeve nut is tightened, the tensioning sleeve generates a uniform radial clamping force, thus securing the displacement sensor firmly and without damage to the preset axial position. This clamping method is not only simple and efficient to operate, but also avoids scratches or deformation that direct tightening might cause to the precision sensor probe. While ensuring connection rigidity, it also protects the integrity of the measuring element and the measurement accuracy.

[0024] A high-precision, highly repeatable, rigid displacement measuring device includes a fixing mechanism comprising a second transverse plate with a fixing plate at its top. The fixing plate is used to fix the measured object via fastening connectors. The design of fixing the measured object with fastening connectors (such as bolts or clamps) provides a rigid, reliable, and versatile connection method. This method effectively constrains the measured object, preventing any unexpected shaking or displacement during operation (such as being driven to clamp and release), ensuring the stability of the measured object's posture during measurement. This ensures that the displacement change data detected by all displacement sensors purely reflect the deformation or movement of the measured object itself, greatly improving the accuracy and validity of the measurement data.

[0025] Furthermore, a second handle is provided at the bottom edge of the fixing plate;

[0026] When the second handle is not tightened, the fixing plate can slide relative to the slide rail;

[0027] When the second handle is tightened, the position of the fixed plate relative to the slide rail is fixed, preventing further movement along the slide rail. By using the second handle located at the bottom edge of the fixed plate and directly linking its operating state (tightened / untightened) to the sliding degree of freedom of the fixed plate relative to the slide rail, a quick-locking and releasing mechanism with intuitive operation and rapid response is constructed. This design effectively solves the technical risk of unexpected slippage along the slide rail after coarse positioning of the fixed plate (and the workpiece mounted on it), and throughout the measurement process. When the second handle is tightened, the tightening component connected to the second handle generates sufficient locking force, converting the sliding pair between the fixed plate and the slide rail into a rigid connection. This accurately and securely locks the workpiece in the predetermined position, fundamentally ensuring the uniqueness and invariance of the initial reference and positional reference during the measurement process—a crucial prerequisite for achieving highly repeatable measurements. The locking mechanism uses a handle operation, eliminating the need for additional tools and enabling convenient one-person, one-handed operation. In the "untightened" state, the fixing plate can slide easily, facilitating quick adjustment of the initial lateral position of the measured part. When locking is required, simply tightening the handle instantly completes the fastening. This "one-button" locking greatly simplifies the operation process, shortens setup and adjustment time, improves measurement efficiency, and reduces random errors introduced by improper tool use or inconsistent tightening torque, thus enhancing the repeatability and standardization of the operation. The locking mechanism is simple and reliable, and the locking force acts directly on the sliding interface, resulting in a short force flow path and effectively suppressing minor movement caused by vibration and external interference. It provides a rigid mounting base for the measured part in the lateral dimension, enabling it to resist the reaction force generated by its own movement and maintain positional stability during operation (such as driven operation). This ensures that the signal detected by the displacement sensor purely reflects the deformation or displacement of the measured part itself, rather than its overall rigid body movement, greatly guaranteeing the accuracy and validity of the measurement data.

[0028] A high-precision, highly repeatable rigid displacement measuring device is disclosed. The measured workpiece is a caliper, equipped with an external interface for connecting to an external drive device. During the measurement process, the drive device is used to drive the caliper to perform clamping or releasing movements. Taking the measurement of a floating caliper as an example, the floating caliper, as a typical braking actuator, has a complex structure with multiple critical areas where elastic deformation may occur, such as the exposed caliper body, internal piston cavity, and sliding pin hole. This claim concretizes the application scenario of the measuring device, clarifying that this high-precision measuring device can effectively solve the displacement measurement problem of complex workpieces such as floating calipers with multiple measurement surfaces and some measurement points located internally or in structurally concealed areas. By reliably mounting the floating caliper with a fixing mechanism and utilizing a multi-degree-of-freedom adjustable displacement sensor array, the displacement changes of multiple key stress points on the surface and inside of the floating caliper can be simultaneously and accurately assessed, thereby precisely evaluating its overall rigidity and local flexibility. By specifying that the floating caliper has an external interface for connecting to an external drive device, and that the caliper is driven by this drive device to perform clamping and releasing movements during the measurement process, the displacement measurement of the floating caliper surface structure is performed under dynamic cycling simulating the actual working state of the floating caliper. This design enables the displacement sensor to detect and record the displacement change curve of the caliper in real time throughout the entire process of hydraulic or pneumatic actuation, clamping force generation, and release and return, rather than simply acquiring static single-point data. This provides a direct means to solve the technical problem of difficulty in obtaining the dynamic deformation law of the brake caliper during actual operation in existing technologies. The obtained data is of great value for analyzing its working stability, fatigue characteristics, and optimizing structural design.

[0029] A high-precision, highly repeatable rigid displacement measurement method includes the following steps:

[0030] The test piece is mounted and fixed onto the fixing mechanism;

[0031] Move the coarse adjustment displacement mechanism to drive all the displacement sensors to move as a whole in the horizontal and / or vertical direction until the measuring end of any one of the displacement sensors contacts and abuts the corresponding measuring point on the surface of the workpiece being measured.

[0032] Lock the coarse adjustment displacement mechanism to fix its position;

[0033] For the remaining displacement sensors that have not contacted the test piece, their respective fine-tuning displacement mechanisms are independently fine-tuned to drive each displacement sensor to move laterally and / or vertically until their measuring ends contact and adhere to the predetermined measuring points on the surface of the test piece.

[0034] For the measuring point located inside the hole of the test piece, loosen the bolt of the tension sleeve at the corresponding displacement sensor, move the displacement sensor along its axis and insert it into the hole until its measuring end contacts and fits the measuring point inside the hole, and then tighten the bolt of the tension sleeve to fix it.

[0035] The device under test is driven to operate, and each displacement sensor detects the displacement change of the corresponding measurement point in real time and transmits the detection data to an external analysis device for processing.

[0036] After the measurement is completed, the coarse adjustment displacement mechanism is unlocked and moved in the reverse direction to move all the displacement sensors away from the measured object, so as to safely remove all the displacement sensors from the measurement point.

[0037] This method transforms the hardware advantages of the aforementioned high-precision measuring device into clear and orderly operational steps, forming a complete operational specification from initial clamping, multi-level alignment adjustment, dynamic measurement to safe reset. This process scientifically decomposes the complex multi-sensor measurement task, with clear logic and interconnected steps. It effectively overcomes the technical risks of low efficiency, poor repeatability, and even sensor damage caused by arbitrary and disordered steps in manual operation, ensuring that every measurement is performed under the same optimized procedure, which is the core guarantee for achieving high repeatability measurement. This method establishes the operational logic of first performing rapid overall coarse positioning of the sensor array, and then performing independent fine adjustment of each sensor, through the overall movement of the coarse adjustment displacement mechanism, locking the coarse adjustment displacement mechanism, independently fine-tuning each sensor, and axially extending the displacement sensor. This strategy maximizes the use of the large-range movement capability of the coarse adjustment displacement mechanism and the precision adjustment capability of the fine adjustment displacement mechanism. While ensuring the final alignment accuracy, it significantly shortens the overall alignment time of multiple measuring points, solving the technical problem of time-consuming and lengthy manual fine alignment of multiple measuring points, and greatly improving measurement efficiency. The step of independently fine-tuning each sensor clarifies the fine-tuning of surface measurement points. The axial insertion of the displacement sensor via a tensioning sleeve for fine-tuning is specifically designed for measurement points "located inside holes in the measured part," specifying a method for axially inserting the sensor by operating the tensioning sleeve. This differentiated operational guidance ensures reliable and stable end-fitting for all types of measurement points on the measured part (exposed surfaces, inner hole walls, etc.), avoiding poor contact or measurement blind spots caused by improper operation, thus guaranteeing the integrity and accuracy of the collected displacement data. Real-time dynamic measurement is performed while the measured part is in operation, with simultaneous data transmission and analysis, seamlessly transforming the device's measurement capabilities into effective data output. After measurement, the coarse adjustment mechanism is unlocked to safely remove all sensors as a whole. This prescribed reset operation effectively prevents sensor collision damage that may occur during disassembly of the measured part or preparation for the next measurement, reflecting the human-centered design and equipment protection awareness, extending the device's service life, and reducing operating costs.

[0038] The displacement measuring device provided by this invention, by employing a multi-axis precision guide rail structure and a modular locking mechanism, completely replaces the traditional magnetic gauge holder clamping method that relies on manual adjustment, achieving rapid, accurate, and highly repeatable measurement of multi-point displacement on the surface of brake calipers and other complex mechanical components. Its advantages are: the integrated three-axis guide rail system allows the sensor array to be conveniently and stably positioned and fitted to each measurement point, significantly reducing operational difficulty and human error; the compact and rigid overall design ensures measurement stability in vibration environments; the flexible adjustment and locking mechanism not only supports simultaneous measurement of multiple measurement points but also accommodates complex testing conditions such as simulated real vehicle conditions and high and low temperature environments, significantly improving measurement efficiency, data consistency, and engineering applicability. Attached Figure Description

[0039] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the overall device of the present invention.

[0041] Figure 2 This is a schematic diagram of the coarse adjustment mechanism and the fine adjustment mechanism of the present invention.

[0042] Figure 3 This is a schematic diagram of the second tension block and displacement fixing block of the present invention, showing their front and back mounting.

[0043] Figure 4 This is a front view of the device of the present invention.

[0044] Figure 5 This is a schematic diagram of the caliper of the present invention being measured by a displacement sensor.

[0045] Figure 6 This is a schematic diagram of the second compact block structure of the present invention.

[0046] Figure descriptions: 1-Coarse adjustment displacement mechanism, 2-Fine adjustment displacement mechanism, 3-Displacement sensor, 4-Fixing mechanism, 5-Turntable mechanism, 6-Measured workpiece, 11-Tooling base plate, 111-Slide rail, 12-First transverse plate, 12a-First handle, 13-Support base plate, 14-Support vertical plate, 15-Guide block, 16-First tensioning block, 161-Tensioning port, 16a-Third locking port, 16b-Fourth locking port, 21-Transverse strip, 22-Second Tensioning block, 22a - No. 1 second tensioning block, 22b - No. 2 second tensioning block, 221 - Horizontal block, 221a - First locking port, 222 - Vertical block, 222a - Second locking port, 23 - Displacement fixing block, 23a - No. 1 displacement fixing block, 23b - No. 2 displacement fixing block, 231 - Through hole, 231a - Tensioning sleeve, 41 - Second horizontal plate, 42 - Fixing plate, 42a - Second handle, 51 - Adapter plate, 52 - Rocker arm, 61 - Caliper. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] Example 1:

[0050] See attached document Figure 1 , Figure 4 As shown, this embodiment details a high-precision, highly repeatable rigid displacement measuring device and its application in measuring automotive components. The core task of this device is to simultaneously and accurately measure the minute displacements or deformations of multiple key points on the surface and inside of the workpiece under dynamic conditions simulating its actual working cycle. This embodiment uses a complex automotive brake caliper as an example to demonstrate the device's powerful measurement capabilities for workpieces with multiple measurement surfaces, where some measurement points are located internally or in structurally concealed areas.

[0051] The main body of the device includes a fixing mechanism 4 for mounting and driving the workpiece 6 under test. The fixing mechanism 4 has a second transverse plate 41 and a top fixing plate 42. The fixing plate 42 securely clamps the workpiece under test (such as a caliper 61) with fasteners such as bolts and clamps. The second handle 42a at its bottom edge can ensure that the entire fixing mechanism is locked relative to the slide rail 111 of the tooling base plate 11 when tightened, preventing overall slippage during the measurement process.

[0052] See attached document Figures 1-4 As shown, the core of achieving precise positioning of the sensor array lies in the coordinated operation of the coarse adjustment displacement mechanism 1 and the fine adjustment displacement mechanism 2. The base of the coarse adjustment displacement mechanism 1 is a tooling base plate 11, on which a slide rail 111 is provided. The first transverse plate 12 can slide along the rail to achieve a wide range of transverse movement and is locked by the first handle 12a at its bottom. Guide blocks 15 with scales are mounted on the first transverse plate 12 through a supporting base plate 13 and two supporting upright plates 14 on both sides. At least one first tensioning block 16 can slide along the guide block 15. The tensioning port 161 on the first tensioning block is used for the initial installation of the fine adjustment displacement mechanism 2, while the first tensioning block 16 itself is fixed to the guide block 15 and initially locked to the fine adjustment mechanism 2 through the third locking port 16a and the fourth locking port 16b, respectively.

[0053] See attached document Figure 2 , Figure 3 , Figure 6 As shown, the fine-tuning displacement mechanism 2 is responsible for the final precision alignment. It includes a transverse strip 21, and the displacement sensor 3 is connected via a second tension block 22. The second tension block 22 is a bent structure comprising the transverse block 221 and the vertical block 222, and can be installed either upright or in reverse according to the spatial position of the measurement point to avoid interference. (See attached diagram.) Figure 6 As shown, by designing the second tension block for height adjustment as a bent block structure comprising vertical and horizontal blocks, the component itself possesses multi-directional extension characteristics. Crucially, this structure allows for "positive mounting" or "negative mounting" depending on the actual spatial position of the measurement point on the surface of the workpiece. As illustrated, the negative mounting state (e.g., second tension block 22a) allows the overall adjustable range of the sensor to be lowered, thus adapting to lower measurement points; the positive mounting state (e.g., second tension block 22b) is suitable for measurement points in conventional or higher positions. This design effectively solves the technical problems of sensor installation space conflicts or insufficient adjustment range caused by the complex structure of the workpiece and the varying heights of the measurement points, significantly enhancing the universal adaptability of the measuring device to workpieces with different structures.

[0054] The second locking port 222a on the vertical block 222 is used for the lateral adjustment of the second tensioning block 22 on the transverse strip 21. The first locking port 221a on the transverse block 221 houses a displacement fixing block 23. A horizontal through hole 231 on the displacement fixing block 23 allows the displacement sensor 3 to pass through, and it is finally clamped and fixed by tightening the bolts of the tensioning sleeve 231a. This structure provides the displacement sensor 3 with final fine-tuning freedom in both the axial and lateral directions. The displacement fixing block has two optional assembly orientations. (See attached...) Figure 3 As shown, displacement fixing block 23a is installed in a forward orientation, while displacement fixing block 23b is installed in a reverse orientation. A comparison reveals that the forward orientation shifts the overall axial fine-tuning range of displacement sensor 3 to the right, while the reverse orientation achieves the opposite shift. This design allows operators to flexibly select the most suitable assembly orientation based on the actual spatial location of a specific measurement point on the surface of the workpiece (such as the edge of a groove, boss, or hole on the side of the component), thus cleverly avoiding interference from adjacent structures or precisely covering the target area with the sensor's effective adjustment range. This feature further refines and enhances the adaptability of the fine-tuning mechanism to complex and compact spatial structures, ensuring accurate and stable contact between the sensor tip and the measurement point even under various extreme installation conditions.

[0055] See attached document Figure 1 , Figure 4 As shown, in order to evaluate the performance of the test piece 6 in different postures, the device can also integrate a turntable mechanism 5. This mechanism clamps the wide sides of the tooling base plate 11 through the adapter plate 51. The operator can drive the entire measurement platform, together with the test piece 6 and all displacement sensors 3, to rotate synchronously around the axis of the adapter plate 51 and lock it at any angle by turning the rocker arm 52, thereby simulating the different spatial orientations of the test piece in actual installation.

[0056] See attached document Figure 3 , Figure 5 As shown, taking the measurement of brake caliper 61 as an example, the operator first installs it on the fixing mechanism 4 and connects it to the external drive interface. Next, the coarse adjustment displacement mechanism 1 is moved to bring all sensors close to the caliper until one sensor tip contacts a predetermined area, and then the coarse adjustment displacement mechanism 1 is locked. Afterwards, each fine adjustment displacement mechanism 2 is operated independently, adjusting the height of the second tension block 22 and the lateral position of the displacement fixing block 23 to ensure that the tip of each sensor precisely fits against each predetermined measurement point on the surface of the caliper 61. For measurement points that need to extend into the internal pin hole or piston chamber, the tension sleeve 231a is adjusted to push the sensor axially in and lock it. After alignment, the caliper 84 is driven to perform its working movement, and each displacement sensor 3 detects displacement changes in real time and transmits the data to external analysis software to obtain dynamic deformation data. After the measurement is completed, the entire assembly is moved back to the displacement sensor 3 to detach it from the measured part 6.

[0057] This measuring device also demonstrates high precision and high synchronization in displacement data acquisition. All sensors are connected to external analysis devices through a multi-channel synchronous data acquisition module, enabling real-time, parallel acquisition and display of data from each measuring point, avoiding time difference errors caused by scanning measurements. Furthermore, the system supports customizable sampling frequencies and triggering methods, facilitating coordination with the action cycle of external drive devices. This ensures complete and synchronous recording of displacement change curves during each clamping and releasing process, providing a high-quality data foundation for subsequent stiffness analysis, fatigue assessment, and simulation verification.

[0058] It is worth noting that this embodiment uses a brake caliper 84 as an example for illustration, primarily because it embodies typical measurement challenges such as complex structure, multiple measurement surfaces, and limited spatial location of measurement points. This fully demonstrates that the measuring device is not a dedicated device. Its modular, multi-degree-of-freedom coarse and fine adjustment design concept enables it to be widely applied to various rigid or semi-rigid components requiring high-precision, multi-point synchronous displacement measurement, such as other types of actuators, precision mechanical components, and structural parts, providing a universal and efficient solution for evaluating their deformation and stiffness under working conditions.

[0059] The overall structure of this measuring device is constructed from rigid and robust 9Cr18 metal and temperature-resistant components, possessing excellent thermal stability and mechanical reliability. It can be placed entirely within high- or low-temperature test chambers. When performing displacement measurements under high and low temperature environments, the main frame and guide rail system resist structural deformation caused by temperature changes, maintaining the positioning accuracy of each adjustment axis. Under the combined effects of temperature cycling and working loads, the measured component (such as a brake caliper) is monitored in real-time and synchronously by multiple motion sensors, which monitor the displacement changes resulting from the coupling of thermal and mechanical deformation. The data is then stably transmitted to an external analysis device via high-temperature resistant cables. This functionality enables the device to be widely used in R&D testing and quality verification requiring the simulation of extreme temperature conditions, providing a highly repeatable measurement method for evaluating the deformation behavior and rigidity performance of components across the entire temperature range.

[0060] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art may make some modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but these should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0061] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A high-precision, highly repeatable rigid displacement measuring device, characterized in that, include: The coarse adjustment displacement mechanism (1), the fine adjustment displacement mechanism (2), several displacement sensors (3), and the fixing mechanism (4) for fixing the test piece (6); The fixing mechanism (4) is used to install and fix the test piece (6); The coarse adjustment displacement mechanism (1) and the fine adjustment displacement mechanism (2) are connected and used to drive each of the displacement sensors (3) to move in the horizontal and vertical directions, so that each of the displacement sensors (3) is respectively attached to each measurement point on the surface or inside of the test piece (6). When the measured component (6) is in working condition, each displacement sensor (3) is used to detect the displacement change of the corresponding measurement point in real time and transmit the detected displacement change data to an external analysis device for analysis and processing. The fine adjustment displacement mechanism (2) includes at least one transverse strip (21), and the end of the displacement sensor (3) is fixedly connected to a second tension block (22). The second tension block (22) is provided with a first locking port (221a). The first locking port (221a) is arranged in the vertical direction, and a displacement fixing block (23) is installed in the first locking port (221a). The displacement fixing block (23) is provided with a through hole (231), which is arranged in a horizontal direction; the displacement sensor (3) is inserted through the through hole (231); The second tension block (22) is a bent block structure, including a vertically extending vertical block (222) and a horizontal block (221) extending horizontally from the side of the vertical block (222) toward the test piece (6). The second tight block (22) can be installed either upright or in reverse according to the spatial position of the measurement point to avoid interference; The displacement fixing block (23) has selectable assembly orientation. The positive mounting method causes the axial fine adjustment range of the displacement sensor (3) to shift towards the measured part (6) as a whole, while the reverse mounting method can achieve the shift in the opposite direction.

2. The high-precision, high-repeatability rigid displacement measuring device according to claim 1, characterized in that, The coarse adjustment displacement mechanism (1) includes a tooling base plate (11), on which a slide rail (111) is provided, and a first transverse plate (12) is slidably connected. A supporting base plate (13) is installed on the first horizontal plate (12), and supporting upright plates (14) are respectively provided on both sides of the supporting base plate (13) along its width direction. A guide block (15) is provided between the two supporting uprights (14), and at least one first tension block (16) is slidably connected to the guide block (15). The first tension block (16) is provided with a tensioning opening (161), and the fine adjustment displacement mechanism (2) is installed in the tensioning opening (161) and achieves preliminary positioning through the first tension block (16).

3. The high-precision, high-repeatability rigid displacement measuring device according to claim 2, characterized in that, It also includes a turntable mechanism (5); the turntable mechanism (5) includes a transfer plate (51) and a rocker arm (52), the rocker arm (52) is used to drive the transfer plate (51) to rotate around its own axis; the two wide sides of the tooling base plate (11) are clamped and fixed by the transfer plate (51); when the operator rotates the rocker arm (52), the transfer plate (51) drives the fixing mechanism (4), the displacement sensor (3) and the test piece installed on the fixing mechanism (4) to rotate synchronously around the axis of the transfer plate (51).

4. The high-precision, high-repeatability rigid displacement measuring device according to claim 2, characterized in that, The first tension block (16) is provided with a third locking port (16a) and a fourth locking port (16b); The axial direction of the third locking port (16a) is parallel to the length direction of the top surface of the guide block (15), and the axial direction of the fourth locking port (16b) is parallel to the width direction of the top surface of the guide block (15). A first handle (12a) is provided at the bottom edge of the first transverse plate (12). When the first handle (12a) is tightened, the position of the first transverse plate (12) relative to the slide rail (111) is fixed and it cannot continue to move along the slide rail (111).

5. The high-precision, high-repeatability rigid displacement measuring device according to claim 1, characterized in that, The vertical block (222) is provided with a second locking port (222a); A tensioning sleeve (231a) is provided between the through hole (231) and the displacement sensor (3). When the bolt of the tensioning sleeve (231a) is tightened, the tensioning sleeve (231a) generates a radial clamping force, which fixes the displacement sensor (3) in the through hole (231).

6. The high-precision, high-repeatability rigid displacement measuring device according to claim 2, characterized in that, The fixing mechanism (4) includes a second transverse plate (41), and a fixing plate (42) is provided on the top of the second transverse plate (41). The fixing plate (42) is used to fix the test piece (6) by means of a fastening connector.

7. The high-precision, high-repeatability rigid displacement measuring device according to claim 6, characterized in that, A second handle (42a) is provided at the bottom edge of the fixing plate (42); When the second handle (42a) is not tightened, the fixing plate (42) can slide relative to the slide rail (111); When the second handle (42a) is tightened, the position of the fixing plate (42) relative to the slide rail (111) is fixed and it cannot continue to move along the slide rail (111).

8. The high-precision, high-repeatability rigid displacement measuring device according to claim 1, characterized in that, The test piece (6) is a caliper (61) with an external interface for connecting an external drive device; during the measurement process, the drive device is used to drive the caliper (61) to perform clamping or releasing movements.

9. A high-precision, highly repeatable rigid displacement measurement method based on the device described in claim 1, characterized in that, Includes the following steps: The test piece (6) is installed and fixed on the fixing mechanism (4); Move the coarse adjustment displacement mechanism (1) to drive all the displacement sensors (3) to move as a whole in the horizontal and / or vertical direction until the measuring end of any one of the displacement sensors (3) contacts and adheres to the corresponding measuring point on the surface of the measured part (6). Lock the coarse adjustment displacement mechanism (1) to fix its position; For the remaining displacement sensors (3) that do not contact the test piece (6), their respective fine-tuning displacement mechanisms (2) are independently fine-tuned to drive each displacement sensor (3) to move laterally and / or vertically until their measuring ends contact and adhere to the predetermined measuring points on the surface of the test piece (6). For the measuring point located in the hole of the test piece (6), loosen the bolt of the tension sleeve (231a) at the corresponding displacement sensor (3), move the displacement sensor (3) along its axial direction and extend it into the hole until its measuring end contacts and fits the measuring point in the hole, and then tighten the bolt of the tension sleeve (231a) to fix it. The test piece (6) is driven to be in working state, and each displacement sensor (3) detects the displacement change of the corresponding measurement point in real time and transmits the detection data to an external analysis device for processing; After the measurement is completed, the coarse adjustment displacement mechanism (1) is unlocked and moved in the opposite direction to move all the displacement sensors (3) away from the measured object (6) so as to safely remove all the displacement sensors (3) from the measurement point.

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