Lead screw nut inspection device and inspection method

Abstract

The embodiment of the application provides a screw rod nut detection device and a detection method, and relates to the technical field of automobile part detection. The screw rod nut detection device comprises a support table, the support table comprises a base; a clamping mechanism, the clamping mechanism comprises at least one clamping seat assembly, the clamping seat assembly is connected with the base, the clamping seat assembly has a clamping space, and part of the screw rod nut is arranged in the clamping space along the length direction of the screw rod nut; and a detection mechanism, the detection mechanism at least comprises a detection piece, the detection piece is movably arranged on the base, the detection piece is arranged at a distance from the outer circumferential surface of the screw rod nut, and the detection piece is used for measuring the radial clearance of the screw rod and the nut. The application solves the technical problems of low detection precision, complex operation and high cost of the radial clearance of the screw rod nut in the prior art.

Description

Technical Field

[0001] This application relates to the field of automotive parts testing technology, and more specifically, to a lead screw nut testing device and testing method. Background Technology

[0002] In automotive steering systems, the precision of the lead screw and nut fit has a significant impact on steering performance. Excessive or insufficient radial clearance between the lead screw and nut can lead to inaccurate steering, abnormal steering noise, and decreased handling performance. Therefore, accurately measuring the radial clearance of the lead screw and nut in steering systems is a crucial step in ensuring steering system quality.

[0003] In the field of mechanical engineering, especially in the manufacturing and maintenance of steering gears, the radial clearance of the lead screw nut is a critical parameter. Currently, common testing methods have many shortcomings. Some traditional testing methods may rely on simple measuring tools, such as calipers, but these methods have low accuracy, are easily affected by human error, and cannot achieve real-time, dynamic testing. Other testing devices are complex in structure, cumbersome to operate, and expensive, making them unsuitable for widespread application in production sites.

[0004] There is currently no good solution to the above problems. Summary of the Invention

[0005] This application provides a lead screw nut detection device and method to at least solve the technical problems of low accuracy, complex operation, and high cost in the radial clearance detection of lead screw nuts in the prior art.

[0006] According to one aspect of the embodiments of this application, a lead screw and nut detection device is provided, comprising: a support platform, the support platform including a base; a clamping mechanism, the clamping mechanism including at least one clamping seat assembly connected to the base, the clamping seat assembly having a clamping space, and a portion of the lead screw and nut passing through the clamping space along the length direction of the lead screw and nut; and a detection mechanism, the detection mechanism including at least a detection element, the detection element being movably disposed on the base, the detection element being disposed at a distance from the outer peripheral surface of the lead screw and nut, and the detection element being used to measure the radial offset between the lead screw and the nut.

[0007] Furthermore, the testing mechanism also includes: a support platform, a testing component connected to the support platform, the testing component being disposed on one side of the nut, the support platform being movably disposed on the base along the length direction of the screw nut, wherein the testing component and the support platform are movably connected along the height direction of the screw nut to adjust the position of the measuring point.

[0008] Furthermore, the lead screw and nut detection device also includes a pre-tightening mechanism, which includes: a support base connected to a bearing platform and disposed on the other side of the lead screw and nut; and a pre-tightening member movably disposed on the support base facing the lead screw and nut, the pre-tightening member having a pre-tightening position abutting against the lead screw and nut, and a release position separating from the lead screw and nut.

[0009] Furthermore, the preload mechanism also includes: an elastic element, one end of which is connected to the preload element and the other end of which is connected to the support base, the elastic element being used to provide the preload force required by the screw nut; and an adjusting element, which is connected to the preload element, the adjusting element being used to adjust the compression of the elastic element to adjust the magnitude of the preload force.

[0010] Furthermore, when the preload is in the preload position, the outer circumferential surface of the nut abuts against the preload.

[0011] Furthermore, the clamping assembly includes: a support section connected to a base, the top of the support section having a first groove for supporting a lead screw; and a clamping section rotatably connected to the support section on one side, the clamping section having a second groove; wherein the clamping section has a connection position that engages with the support section, and a clearance position that partially engages with the support section, and when the clamping section is in the connection position, the second groove and the first groove enclose a clamping space.

[0012] Furthermore, the clamping assembly also includes an anti-slip pad, which is connected to at least one of the groove walls of the first groove and the second groove, and the anti-slip pad is used to limit the circumferential rotation of the lead screw.

[0013] Furthermore, the support platform also includes a slide rail, one end of which is connected to the base, and at least part of the slide rail extends along the length of the lead screw nut. The other end of the slide rail is connected to the bearing platform, which can slide along the length of the lead screw nut via the slide rail.

[0014] Furthermore, the lead screw nut detection device also includes a control device, which includes a controller and an analysis module. The controller is electrically connected to the analysis module and the detection element, respectively. The controller is used to control the detection element to measure the distance of the lead screw nut, and the analysis module is used to analyze and process the data measured by the detection element.

[0015] According to another aspect of the embodiments of this application, a method for detecting a lead screw nut is also provided. The method uses the aforementioned lead screw nut detection device and includes: placing the lead screw nut on a clamping assembly, adjusting the preload to a preset value, activating a detection component to measure the measurement points of the lead screw nut, and acquiring measurement data. The measurement points are multiple, and adjacent measurement points are spaced apart. The measurement data is the radial offset of the lead screw nut. Based on the measurement data, the measurement data is processed to obtain a processing result. The processing result includes at least the average value, maximum fluctuation value, maximum value, minimum value, variance, and square root of the measurement data. Based on the processing result, a detection result for the lead screw nut is generated, including whether the lead screw nut meets the clearance setting requirements.

[0016] In this embodiment, the lead screw and nut detection device supports and clamps the lead screw and nut via a base of a support platform and a clamping seat assembly of a clamping mechanism. The clamping seat assembly has a clamping space, through which the lead screw passes, providing a stable clamping force. After stable clamping, a detection mechanism is positioned on the side of the lead screw and nut. This mechanism measures the distance between the lead screw and nut using a detection element, thus determining whether the gap between them meets the set requirements. The detection element is movably mounted on the base, allowing adjustment of the detection point position and enabling the measurement of multiple sets of data to reduce measurement errors. The overall structure is simple and easy to operate, reducing the skill requirements for operators and minimizing the possibility of human error. Furthermore, the device has low cost, facilitating widespread use. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of an optional lead screw and nut detection device according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of an optional pre-tightening mechanism according to an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of an optional lead screw and nut detection device according to an embodiment of this application.

[0021] The above figures include the following reference numerals:

[0022] 10. Support platform;

[0023] 11. Base;

[0024] 12. Slide rail;

[0025] 20. Clamping mechanism;

[0026] 200. Clamping space;

[0027] 21. Clamping base assembly;

[0028] 211. Support section;

[0029] 212. Clamping section;

[0030] 213. Anti-slip mat;

[0031] 30. Lead screw nut;

[0032] 31. Lead screw;

[0033] 32. Nut;

[0034] 40. Testing institutions;

[0035] 41. Inspection items;

[0036] 42. Support platform;

[0037] 50. Pre-tensioning mechanism;

[0038] 51. Support base;

[0039] 52. Preloaded components;

[0040] 53. Elastic components;

[0041] 54. Adjusting components. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] According to an embodiment of this application, a lead screw nut detection device is provided.

[0045] Specifically, such as Figure 1 , Figure 3 As shown, the lead screw and nut detection device includes a support platform 10, a clamping mechanism 20, and a detection mechanism 40. The support platform 10 includes a base 11; the clamping mechanism 20 includes at least one clamping seat assembly 21, which is connected to the base 11 and has a clamping space 200. Along the length direction of the lead screw and nut 30, a portion of the lead screw and nut 30 passes through the clamping space 200; the detection mechanism 40 includes at least one detection element 41, which is movably disposed on the base 11. The detection element 41 is disposed at a distance from the outer peripheral surface of the lead screw and nut 30, and is used to measure the radial offset between the lead screw 31 and the nut 32.

[0046] Applying the technical solution of this embodiment, the lead screw and nut detection device supports and clamps the lead screw and nut 30 via the base 11 of the support platform 10 and the clamping seat assembly 21 of the clamping mechanism 20. The clamping seat assembly 21 is provided with a clamping space 200, and the lead screw 31 passes through the clamping space 200, so that the clamping seat assembly 21 provides a stable clamping force to the lead screw and nut 30. After stable clamping, a detection mechanism 40 is set on the side of the lead screw and nut 30. The detection mechanism 40 measures the distance to the side of the lead screw and nut 30 via the detection element 41, thereby measuring whether the gap between the lead screw 31 and the nut 32 meets the setting requirements. The detection element 41 is movably mounted on the base 11, allowing adjustment of the detection point position, thus enabling the measurement of multiple sets of data at the detection point, facilitating the acquisition of multiple sets of data and reducing measurement errors. The overall structure is simple, easy to operate, reduces the skill requirements of operators, and minimizes the possibility of human error. Furthermore, the device has low cost, which is conducive to widespread use.

[0047] It should be noted that the movement clearance between the lead screw 31 and the nut 32 inside the lead screw nut 30 cannot be directly measured. The clearance value at the connection between the lead screw 31 and the nut 32 can be indirectly measured by measuring the radial offset of the entire lead screw nut 30.

[0048] In one embodiment of this application, the detection component 41 is measured using a laser rangefinder. The laser rangefinder has the characteristics of high measurement accuracy, fast response, small error, and non-contact measurement. It can acquire the radial distance data of the lead screw nut 30 in real time and quickly, which significantly improves the detection efficiency. Furthermore, the non-contact measurement using a laser rangefinder avoids damage and interference to the object being measured, ensuring the reliability of the detection results.

[0049] Specifically, such as Figure 1 , Figure 3 As shown, the detection mechanism 40 also includes a support platform 42. The detection element 41 is connected to the support platform 42. The detection element 41 is disposed on one side of the nut 32. Along the length direction of the lead screw nut 30, the support platform 42 is movably disposed on the base 11. The detection element 41 and the support platform 42 are movably connected along the height direction of the lead screw nut 30 to adjust the position of the measuring point. By placing the detection element 41 on the support platform 42, which can move along the length direction of the lead screw nut 30, the detection element 41 can accurately locate the distance between the lead screw 31 and the nut 32. Measurements can also be taken at different positions of the lead screw nut 30 to obtain more comprehensive radial clearance data. Meanwhile, the detection component 41 itself can be movably mounted on the support platform 42 along the height direction of the lead screw nut 30, allowing for fine adjustment of the height of the detection point. This ensures that no matter how the height of the lead screw nut 30 changes, the measuring end of the detection component 41 can be accurately aligned with the measuring point, avoiding detection errors caused by positional deviations and facilitating the acquisition of multiple sets of data from the measuring point.

[0050] Furthermore, such as Figure 1 , Figure 2As shown, the lead screw nut detection device also includes a preload mechanism 50, which includes a support base 51 and a preload member 52. The support base 51 is connected to the bearing platform 42 and is located on the other side of the lead screw nut 30. The preload member 52 is movably disposed on the support base 51 facing the lead screw nut 30. The preload member 52 has a preload position that abuts against the lead screw nut 30 and a release position that separates from the lead screw nut 30. The pre-tightening mechanism 50 is connected to the bearing platform 42 via the support base 51, allowing the pre-tightening member 52 to be positioned on the other side of the lead screw nut 30. This facilitates the pre-tightening member 52 applying pre-tightening force to the lead screw nut 30. The pre-tightening member 52 is movably mounted on the support base 51. In the pre-tightening position, the pre-tightening member 52 abuts against the lead screw nut 30, applying pre-tightening force to the lead screw nut 30 to ensure that it does not experience unnecessary displacement or vibration during testing, thereby improving the accuracy and repeatability of the test. In the release position, the pre-tightening member 52 separates from the lead screw nut 30, facilitating the installation, removal, and replacement of the lead screw nut 30, simplifying the operation steps, and improving work efficiency.

[0051] Specifically, such as Figure 2 As shown, the preload mechanism 50 also includes an elastic element 53 and an adjusting element 54. One end of the elastic element 53 is connected to the preload element 52, and the other end is connected to the support base 51. The elastic element 53 provides the preload force required by the lead screw nut 30. The adjusting element 54 is connected to the preload element 52 and is used to adjust the compression of the elastic element 53 to adjust the magnitude of the preload force. The two ends of the elastic element 53 are connected to the preload element 52 and the support base 51, respectively. During the process of the preload element 52 moving to the preload position, the elastic element 53 is compressed, generating elastic force, which then transmits the preload force to the preload element 52. The degree of compression of the elastic element 53 determines the magnitude of the preload force. The function of the adjusting element 54 is to adjust the compression of the elastic element 53, thereby controlling the magnitude of the preload force. By rotating or moving the adjusting component 54, the operator can precisely adjust the pressure of the preload component 52 on the lead screw nut 30, allowing the operator to fine-tune the preload according to the specific material, size, and required preload of the lead screw nut 30, thus avoiding problems caused by over-tightening or insufficient preload.

[0052] In one embodiment of this application, such as Figure 2As shown, the support base 51 has an adjustment hole, and the preload 52 passes through the adjustment hole. One end of the preload 52 is used to abut against the screw nut 30 in the preload position, and the other end of the preload 52 passes through the adjustment hole and is connected to the adjustment member 54. The adjustment member 54 is a screw. By rotating the adjustment member 54, the preload 52 can be driven to move between the preload position and the release position. The elastic member 53 is a spring. The two ends of the spring are connected to the preload 52 and the support base 51, respectively. When the preload 52 is in the preload position, the spring can be deformed by adjusting the screw. The other end of the spring applies a preload force to the preload 52, which tightens the screw nut 30. After the test is completed, the compression force on the spring can be released by adjusting the screw, so that the preload 52 returns to the release position, which facilitates the disassembly of the screw nut 30.

[0053] In one embodiment of this application, when the preload member 52 is in the preload position, the outer peripheral surface of the nut 32 abuts against the preload member 52. When the preload member 52 is in the preload position, it abuts against the outer peripheral surface of the nut 32, and the preload force keeps the nut 32 stable during the testing process.

[0054] Furthermore, such as Figure 3 As shown, the clamping assembly 21 includes a support section 211 and a clamping section 212. The support section 211 is connected to the base 11, and a first groove is formed on the top of the support section 211 for supporting the lead screw 31. One side of the clamping section 212 is rotatably connected to the support section 211, and a second groove is formed on the clamping section 212. The clamping section 212 has a connection position that engages with the support section 211, and a clearance position that partially engages with the support section 211. When the clamping section 212 is in the connection position, the second groove and the first groove form a clamping space 200. The support section 211 is fixed to the base 11, and its top is designed with a first groove. The first groove can accurately support the lead screw 31, while allowing the lead screw 31 a certain degree of freedom during testing, avoiding excessive constraint and additional stress. One side of the clamping section 212 is rotatably connected to the support section 211 via a hinge, while the other side has a second groove. When the clamping section 212 is in the connected position, the second groove cooperates with the first groove of the support section 211 to form a clamping space 200 for fixing the lead screw 31. When the clamping section 212 is in the clearance position, it is only partially connected to the support section 211, allowing the clamping section 212 to rotate and open, providing sufficient space and convenience for loading and unloading the lead screw 31, greatly simplifying the operation process and improving the testing efficiency.

[0055] Specifically, such as Figure 3As shown, the clamping assembly 21 also includes an anti-slip pad 213, which is connected to at least one of the groove walls of the first groove and the second groove. The anti-slip pad 213 is used to limit the circumferential rotation of the lead screw 31. The anti-slip pad 213 can be directly connected to at least one of the groove walls of the first groove and the second groove by means of adhesion or embedding, ensuring that the anti-slip pad 213 remains stable and does not fall off or shift when the lead screw 31 is subjected to preload and detection force. When the clamping section 212 is in the connected position, the anti-slip pad 213 is in close contact with the outer surface of the lead screw 31, preventing any unnecessary rotation of the lead screw 31 in the circumferential direction through static friction. By limiting the circumferential rotation of the lead screw 31 through the friction of the anti-slip pad 213, measurement errors caused by the circumferential rotation of the lead screw 31 are avoided, ensuring the circumferential stability of the lead screw 31 and improving the accuracy and reliability of the detection.

[0056] Furthermore, such as Figure 1 , Figure 3 As shown, the support platform 10 also includes a slide rail 12. One end of the slide rail 12 is connected to the base 11, and at least a portion of the slide rail 12 extends along the length of the lead screw nut 30. The other end of the slide rail 12 is connected to the support platform 42, which can slide along the length of the lead screw nut 30 via the slide rail 12. One end of the slide rail 12 is firmly connected to the base 11, and the other end is connected to the support platform 42, forming a stable and adjustable moving platform. The support platform 42 is equipped with a slider, which can slide smoothly along the slide rail 12. Its sliding direction is consistent with the length direction of the lead screw nut 30, ensuring that the testing tool on the support platform 42 can be accurately positioned at any testing point of the lead screw nut 30. The sliding capability of the support platform 42 eliminates the need for frequent disassembly and repositioning of the lead screw nut 30 during testing. The operator only needs to adjust the position of the support platform 42 on the slide rail 12 to continuously measure multiple positions of the lead screw nut 30, greatly simplifying the operation process and improving the testing speed.

[0057] Furthermore, the lead screw and nut detection device also includes a control device, which comprises a controller and an analysis module. The controller is electrically connected to the analysis module and the detection element 41, respectively. The controller is used to control the detection element 41 to measure the distance to the lead screw and nut 30, and the analysis module is used to analyze and process the data measured by the detection element 41. Before the detection begins, a detection plan can be preset, including parameters such as the number of measurements, the measurement interval, and the magnitude of the preload. The controller will precisely control the detection element 41 to measure the distance to the lead screw and nut 30 according to these instructions. The controller can also monitor the working status of the preload mechanism 50 to ensure that the lead screw and nut 30 is always under ideal preload conditions during the detection process. After receiving the raw distance measurement data from the detection element 41, the analysis module can use a preset algorithm to analyze the data, such as calculating the average value, maximum value, minimum value, and fluctuation range, to evaluate the radial clearance condition of the lead screw and nut 30.

[0058] It should be noted that the analysis module may also include machine learning or artificial intelligence algorithms, which can automatically adjust detection parameters based on historical data, identify patterns of abnormal detection results, and predict potential future problems with the lead screw nut 30, providing forward-looking guidance for production and maintenance. The integrated use of the controller and analysis module not only simplifies the operation process and reduces human error, but also enables the lead screw nut detection device to adapt to more demanding detection tasks, providing strong support for improving product quality and production efficiency.

[0059] According to another specific embodiment of this application, a method for detecting a lead screw nut is provided. The method employs the lead screw nut detection device described in the above embodiment and includes:

[0060] Step S10: Place the lead screw nut on the clamping seat assembly, adjust the preload to the preset value, start the detection component to measure the measurement points of the lead screw nut, and obtain measurement data. There are multiple measurement points, and the distance between two adjacent measurement points is set. The measurement data is the radial offset of the lead screw nut.

[0061] Specifically, the lead screw nut is placed on the clamping seat assembly, so that the lead screw extends into the clamping space formed by the first groove and the second groove. The circumferential rotation is fixed by the anti-slip pad, and the pre-tightening mechanism 50 pairs of nuts are pre-tightened to adjust the pre-tightening force to the preset value. The preset value needs to be determined according to the specific material, size and design specifications of the lead screw nut to ensure that the pre-tightening force on the lead screw nut is appropriate during the test.

[0062] In step S10, after the measurement point is determined, multiple sets of data can be collected around the measurement point by moving the position of the detection element 41, thereby acquiring data from multiple measurement points to obtain multiple sets of measurement data, so as to enrich the sample for subsequent data analysis and make the measurement results more accurate.

[0063] Step S20: Based on the measurement data, process the measurement data and obtain the processing results. The processing results include at least the average value, maximum fluctuation value, maximum value, minimum value, variance, and square root of the measurement data.

[0064] Specifically, based on the acquired multiple sets of measurement data, after processing the data, multiple processing results can be obtained. Different processing results can represent different meanings. For example, variance and square root can be used to evaluate the stability of data manufacturing, while the average value represents the overall level of radial clearance of the lead screw nut, etc.

[0065] Step S30: Based on the processing results, generate the detection results of the lead screw nut, including whether the lead screw nut meets the clearance setting requirements.

[0066] Specifically, based on the obtained processing results, each value is compared with the radial clearance target range specified in the design standard or technical specification. If all values ​​meet the requirements, the screw nut can be determined to meet the clearance setting requirements; otherwise, it is marked as a non-conforming product.

[0067] It should be noted that once the test results are generated, they will be presented to operators and engineers through the control device's display interface or a printed report. Based on the test results, a decision will be made on whether to release the product, or to rework or scrap it. For automated testing systems on continuous production lines, defective products will be automatically screened out to prevent them from flowing into subsequent processes, ensuring the quality of the final product.

[0068] Through the above steps, the lead screw nut is placed on the clamping assembly, the preload is adjusted to the preset value, and the detection device is activated to measure the measurement points of the lead screw nut, acquiring measurement data. Multiple measurement points are set with a distance between adjacent points, and the measurement data is the distance between the detection device and the lead screw nut. Based on the measurement data, the data is processed to obtain the processing results. The processing results include at least the average value, maximum fluctuation value, maximum value, minimum value, variance, and square root of the measurement data. Based on the processing results, the detection results of the lead screw nut are generated, including whether the lead screw nut meets the clearance setting requirements. By placing the lead screw nut on the clamping assembly and adjusting the preload to the preset value, the stability of the lead screw nut during the detection process is ensured. Then, the detection device is activated to measure multiple measurement points, acquiring multiple sets of measurement data, improving the accuracy and reliability of the detection. This allows for precise measurement of the radial clearance of the lead screw nut, avoiding measurement errors caused by improper measurement point settings or inaccurate preload adjustment.

[0069] This application also provides a preferred embodiment of a lead screw nut detection device and detection method. By using an adjustable spring to apply a fixing force and combining it with a laser rangefinder for detection, the required skill level of the operator is reduced, and the possibility of human error is decreased. At the same time, the device has a relatively low cost, which facilitates its widespread application in production sites.

[0070] Specifically, the lead screw and nut testing device includes a preload mechanism 50, a laser rangefinder, and a clamping mechanism 20. The preload mechanism 50 consists of an elastic element 53, an adjusting element 54, and a preload element 52. One end of the elastic element 53 is fixed to the support base 51, and the other end is connected to the preload element 52. By rotating the adjusting element 54, the pressure of the preload element 52 on the lead screw and nut 30 can be changed, thereby adapting to lead screws and nuts of different specifications. During testing, the appropriate pressure range is first calculated based on the size and material of the lead screw and nut 30, and then the preload is adjusted to this range by adjusting the adjusting element 54.

[0071] The laser rangefinder is mounted on a movable support platform 42 and can be finely adjusted in both horizontal and vertical directions. Its measuring end is precisely aligned with the measuring point of the lead screw nut 30 to ensure the accuracy of the measurement data. During the detection process, the laser rangefinder transmits the measured distance data to the controller and analysis module in real time for data processing and analysis.

[0072] The clamping mechanism 20 of the lead screw nut 30 adopts a special design, which can quickly and stably fix lead screw nuts of different specifications. The clamping space 200 of the clamping seat assembly 21 is provided with an anti-slip pad 213 to prevent the lead screw nut 30 from moving or rotating during the testing process.

[0073] The specific testing steps are as follows:

[0074] Step 1: Install the lead screw nut 30 to be tested onto the clamping seat assembly 21, and ensure that the installation is secure;

[0075] Step 2: Adjust the preload mechanism 50 so that the preload component 52 applies appropriate pressure to the lead screw nut 30;

[0076] Step 3: Activate the laser rangefinder and take multiple measurements at different positions of the lead screw nut 30 to obtain multiple sets of data;

[0077] Step four: The measurement data is transmitted to the computer control system, and the radial offset of the lead screw nut 30 is calculated using a specific algorithm.

[0078] It should be noted that after receiving the measured data (typically a set of data sampled every 1mm), such as X1, X2, X3, X4, Xn…, the computer control system calculates the average value X0, maximum fluctuation value Amax, maximum value Xmax, minimum value Xmin, etc., using a computer calculator. It can also calculate the square root of the data to assess the manufacturing stability of the data. The computer is usually developed with a program to input standard numerical values. It can input technical parameter values ​​and compare the calculated results with the set values ​​to comprehensively evaluate whether the clearance of the lead screw and nut meets the requirements. If it does not meet the requirements, it provides alarm reminders, such as indicating errors or that the average value exceeds the tolerance, etc. If the equipment is installed at the inspection station on the production line, it will indicate that the product is unqualified and cannot proceed to the next process, preventing the production of defective products and avoiding after-sales problems.

[0079] As can be seen from the above description, the screw nut testing device in the above embodiments has the following beneficial effects: Compared with the unstable or difficult-to-control fixing force in traditional methods, the adjustment of the spring provides a stable and controllable preload, reducing measurement errors caused by uneven force; non-contact measurement avoids damage and interference to the object being tested, ensuring the reliability of the test results; the device structure of the present invention is relatively simple and easy to operate, reducing the skill requirements of operators and the possibility of human error. At the same time, the cost of the device is relatively low, which is conducive to its widespread application in production sites; through reasonable design and parameter adjustment, the device has good versatility and can adapt to the testing of screw nuts of different models and specifications, reducing investment in testing equipment and improving the flexibility of testing work.

[0080] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0081] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lead screw and nut testing device, characterized in that, include: Support platform (10), the support platform (10) includes a base (11); The clamping mechanism (20) includes at least one clamping seat assembly (21), which is connected to the base (11). The clamping seat assembly (21) has a clamping space (200), and a portion of the lead screw nut (30) passes through the clamping space (200) along the length direction of the lead screw nut (30). The detection mechanism (40) includes at least one detection element (41), which is movably disposed on the base (11). The detection element (41) is disposed at a distance from the outer peripheral surface of the lead screw nut (30). The detection element (41) is used to measure the radial offset between the lead screw (31) and the nut (32). The testing facility (40) also includes: The support platform (42) is connected to the detection element (41). The detection element (41) is disposed on one side of the nut (32). Along the length direction of the lead screw nut (30), the support platform (42) is movably disposed on the base (11). Along the height direction of the lead screw nut (30), the detection element (41) and the support platform (42) are movably connected to adjust the position of the measuring point. The lead screw nut detection device further includes a preload mechanism (50), which includes: Support base (51), the support base (51) is connected to the bearing platform (42), and the support base (51) is located on the other side of the lead screw nut (30); A preload member (52) is movably disposed on the support base (51) facing the lead screw nut (30). The preload member (52) has a preload position that abuts against the lead screw nut (30) and a release position that is separated from the lead screw nut (30). The support platform (10) also includes a slide rail (12), one end of which is connected to the base (11). At least a portion of the slide rail (12) extends along the length of the lead screw nut (30), and the other end of the slide rail (12) is connected to the bearing platform (42). The bearing platform (42) can slide along the length of the lead screw nut (30) via the slide rail (12).

2. The lead screw and nut detection device according to claim 1, characterized in that, The pre-tightening mechanism (50) further includes: An elastic element (53) is provided, one end of which is connected to the preload element (52) and the other end of which is connected to the support base (51). The elastic element (53) is used to provide the preload required by the lead screw nut (30). Adjusting member (54), which is connected to the pretensioning member (52), is used to adjust the compression of the elastic member (53) to adjust the magnitude of the pretensioning force.

3. The lead screw and nut detection device according to claim 2, characterized in that, When the preload (52) is in the preload position, the outer circumferential surface of the nut (32) abuts against the preload (52).

4. The lead screw and nut detection device according to any one of claims 1-3, characterized in that, The clamping seat assembly (21) includes: Support section (211) is connected to the base (11). The top of the support section (211) is provided with a first groove, which is used to support the lead screw (31). A clamping section (212) is provided, one side of which is rotatably connected to the support section (211), and a second groove is provided on the clamping section (212). The clamping section (212) has a connection position that cooperates with the support section (211), and the clamping section (212) has a clearance position that is partially connected with the support section (211). When the clamping section (212) is located in the connection position, the second groove and the first groove surround to form the clamping space (200).

5. The lead screw and nut detection device according to claim 4, characterized in that, The clamping seat assembly (21) further includes an anti-slip pad (213), which is connected to at least one of the groove wall of the first groove and the groove wall of the second groove. The anti-slip pad (213) is used to restrict the circumferential rotation of the lead screw (31).

6. The lead screw and nut detection device according to claim 1, characterized in that, The lead screw nut detection device also includes a control device, which includes a controller and an analysis module. The controller is electrically connected to the analysis module and the detection element (41) respectively. The controller is used to control the detection element (41) to measure the distance of the lead screw nut (30). The analysis module is used to analyze and process the data measured by the detection element (41).

7. A method for detecting lead screw nuts, characterized in that, The method is performed using the lead screw and nut detection device as described in any one of claims 1-6, and the method includes: Place the lead screw nut on the clamping seat assembly, adjust the preload to the preset value, and start the detection device to measure the measurement points of the lead screw nut to obtain measurement data. There are multiple measurement points, and adjacent measurement points are set at a distance. The measurement data is the radial offset of the lead screw nut. Based on the measurement data, the measurement data is processed to obtain the processing result, which includes at least the average value, maximum fluctuation value, maximum value, minimum value, variance, and square root of the measurement data. Based on the processing results, a detection result for the lead screw nut is generated, including whether the lead screw nut meets the clearance setting requirements.

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