High-precision meshing and error compensation external thread compatible quantitative detection device

Abstract

The invention discloses a high-precision meshing and error compensation external thread compatible quantitative detection device, which comprises a base, a back plate, a rib plate, a micro industrial personal computer and a detection device, the back plate is fixed on the base through a rib plate, so that the back plate is kept vertical to the base, and the micro industrial personal computer is arranged at the upper end of the back plate through a fastener and is used for man-machine interaction; the detection device is connected with the back plate and the base through fasteners, is perpendicular to the base, is parallel to the back plate, is installed in the center of the back plate, and is used for completing quantitative detection of external threads. According to the invention, the meshing state can be quantitatively adjusted, the offset error of a contact point can be compensated, a single standard component can realize compatible detection on full-size calibration, and the compatibility and the detection precision of external thread detection are improved.

Description

Technical Field

[0001] The present invention relates to an external thread compatible quantitative detection device with high-precision meshing and error compensation, belonging to the field of comprehensive quantitative detection of the pitch diameter of external threads. Background Art

[0002] Due to its simple structure, convenient loading and unloading, high reliability and other characteristics, the thread has been widely used in the mechanical industry after more than a hundred years of development. In the industry, the product structure usually selects threads with high reliability, good interchangeability and strong versatility for connection. The machining quality of the thread directly affects the assembly performance and use safety of the product. In China's mechanical processing industry, using thread gauges for thread inspection is the most important inspection method. It has high detection efficiency and is suitable for large-scale detection. However, this method also has some disadvantages. Thread gauges are special measuring tools with low detection accuracy and poor versatility. They can only qualitatively judge whether it is qualified or not, and cannot give the specific values of each parameter. At the same time, it is also easily affected by factors such as the operation method of the operator, subjective judgment, and wear of the measuring tool, resulting in inconsistent inspection results when detecting the same workpiece.

[0003] CN107490328B discloses a thread ring gauge, which consists of a base, a support block, a detection mechanism, etc. In the detection mechanism, the first and second thread rollers are slidably connected to the detection part, and the third thread roller is rotatably connected to the detection part. The three thread rollers form a detection area. The head of the micrometer is in contact with one end of the third thread roller for detecting data feedback; this kind of thread ring gauge uses a standard part of the corresponding specification to compare and detect with the thread to be inspected. To measure an external thread of one size, a standard part of the corresponding specification needs to be provided, so the versatility is not strong. At the same time, the thread rollers on the detection mechanism are connected to the rotating block and the pressing block through connecting parts. The adjustment range of the detection area formed by the thread rollers is small. The diameter of the product to be inspected must be within the adjustment range to be detected, so the compatibility is low; the tops of the three thread rollers are on the same plane and cannot be quantitatively adjusted, making it difficult to ensure complete meshing and resulting in a reduction in detection accuracy; when using the standard part and the thread to be inspected for comparative detection, due to the size difference between the two, the contact points with the thread rollers will shift, thus introducing detection errors and reducing the accuracy of the detection results; therefore, the versatility and compatibility of this method are not strong, and the detection accuracy is not high. Summary of the Invention

[0004] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, a high-precision meshing and error compensation external thread compatible quantitative detection device is proposed, which can quantitatively adjust the meshing state and compensate for the contact point offset error. A single standard part can achieve compatible detection for full-size calibration, improving the compatibility and detection accuracy of external thread detection.

[0005] The technical solution of the present invention is: a high-precision meshing and error compensation compatible quantitative detection device for external threads, comprising: a base, a back plate, a rib plate, a micro industrial computer, and a detection device; the back plate is fixed to the base by the rib plate, thereby keeping the back plate perpendicular to the base; the micro industrial computer is set on the upper part of the back plate by fasteners for human-machine interaction; the detection device is connected to the back plate and the base by fasteners, is perpendicular to the base, parallel to the back plate, and installed at the center of the back plate, for completing the quantitative detection of external threads.

[0006] The detection device includes a support plate, a guide rail, a slider, an upper bracket, an upper detection module, a lower bracket, a two-dimensional differential platform, a lower detection module, and a grating ruler;

[0007] The support plate is made of marble flat plate and is connected to the back plate by fasteners. The lower end is flush with the base to ensure the verticality of the guide rail.

[0008] The guide rail is connected to the support plate by fasteners, is parallel to the support plate and installed at the center of the support plate, and is used for the directional movement of the slider in the vertical direction;

[0009] The slider is slidably connected to the guide rail, allowing it to slide vertically along the guide rail.

[0010] The upper bracket is connected to the slider by fasteners and is used for supporting and positioning the extension block;

[0011] The extension block is connected to the lower part of the upper bracket by fasteners and is used for supporting and positioning the upper detection module;

[0012] The handle is connected to the upper part of the upper bracket by fasteners, allowing the operator to lift the upper detection module;

[0013] The upper detection module is mounted on the extension block, and the upper detection module can be moved vertically along the guide rail by lifting the handle.

[0014] The lower bracket is connected to the base and the support plate respectively, and its direction is horizontal with the guide rail. It is used for the support and positioning of the two-dimensional differential platform.

[0015] The two-dimensional differential platform is connected to the lower support via fasteners and is used for quantitative adjustment of the lower detection module in the horizontal plane;

[0016] The lower detection module is connected to the two-dimensional differential platform via fasteners. The lower detection module can be moved in the horizontal plane by adjusting the horizontal and vertical adjustment rods on the two-dimensional differential platform.

[0017] The scale grating of the grating ruler is mounted on the support plate and kept parallel to the guide rail. The reading head is connected to the left side of the extension block of the upper bracket through the follower block. When the upper detection module is lifted by the handle for thread detection, the reading head moves synchronously with the upper detection module, thereby completing the real-time detection and feedback of movement data.

[0018] The upper detection module includes an upper mounting base, a fixed clamping block 1, a clamping stud 1, a movable clamping block 1, and a locking screw 1. The upper mounting base is mounted on the extension block via fasteners for the installation and positioning of the clamping stud 1. The fixed clamping block 1, clamping stud 1, movable clamping block 1, and locking screw 1 are all mounted on the upper mounting base. The lower detection module includes a lower mounting base, a fixed clamping block 2, a clamping stud 2, a clamping stud 3, a movable clamping block 2, and a locking screw 2. The lower mounting base is connected to the two-dimensional differential platform via fasteners. The fixed clamping block 2, clamping stud 2, clamping stud 3, movable clamping block 2, and locking screw 2 are all mounted on the lower mounting base for the installation and fixing of clamping stud 2 and clamping stud 3. Clamping stud 2 and clamping stud 3 are tightly engaged. A detection area is formed between clamping stud 1 and clamping stud 2 and clamping stud 3.

[0019] During testing, raise the upper testing module to a height 2-3 cm greater than the thread diameter of the product to be tested. Place the thread of the product to be tested into the testing area, where it engages with the clamping studs two and three of the lower testing module and remains horizontal. Then release the upper testing module, allowing its gravity to compact the thread of the product to be tested, thus achieving engagement between the upper and lower testing modules. After the upper testing module is finally compacted and engaged, the reading of the grating ruler, which moves synchronously with the upper testing module, will change accordingly, thereby obtaining the measurement data value and completing the product thread testing. When it is necessary to test threads of other specifications and sizes, raise the upper testing module to the matching height to achieve the measurement of threads of other specifications and sizes.

[0020] The lower detection module is connected to the two-dimensional differential platform via fasteners. The two-dimensional differential platform moves the lower detection module in the horizontal plane by adjusting the horizontal and vertical adjustment rods on it. The position of the two-dimensional differential platform in the horizontal plane is adjusted online to achieve the engagement of the clamping stud one of the upper detection module with the clamping stud two and clamping stud three of the lower detection module.

[0021] The upper detection module is detachably connected to the extension block via fasteners, and the lower detection module is detachably connected to the two-dimensional differential platform via fasteners; when detecting threads of different product models, the upper and lower detection modules can be replaced by disassembling them.

[0022] The clamping studs 1 of the upper detection module and 2 and 3 of the lower detection module use threads of the same specification and size, and their end faces are ground horizontally to ensure that the end faces of the three are parallel to the horizontal plane.

[0023] The clamping studs two and three of the lower detection module are tightly engaged and fixed using a clamping block.

[0024] The diameters of clamping stud one, clamping stud two, and clamping stud three are all smaller than the thread diameter of the product to be inspected.

[0025] The guide rail is vertically centered on the support plate, the slider is slidably connected to the guide rail, the upper bracket is fixedly connected to the slider, and the upper detection module is detachably connected to the upper bracket. The weight of the upper detection module is reasonably set. By adopting the above scheme, the upper detection module can move vertically, the detection area has a large adjustable distance, good guiding stability, and wide compatibility with the thread size of the product to be inspected. At the same time, the weight of the upper detection module can be reasonably set, and the product to be inspected can be compacted by gravity during the detection process without manual intervention, thus improving the detection stability.

[0026] The movable clamping block 1 and the upper mounting base are provided with threaded holes. The locking screw 1 is screwed into the threaded hole and threadedly connected to the movable clamping block 1. Tightening the locking screw 1 reduces the distance between the fixed clamping block 1 and the movable clamping block 1, and limits and fixes the clamping stud 1. The clamping stud 2 and clamping stud 3 on the lower detection module are limited and fixed in the same way.

[0027] The clamping studs 2 and 3 of the lower detection module are tightly engaged. In the natural state, the clamping stud 1 of the upper detection module is engaged with the clamping studs 2 and 3 of the lower detection module. The three studs are of the same size and their centers form an equilateral triangle. The centers of the three clamping studs form the smallest equilateral triangle. When detecting threads of products of different sizes, the contact point between the outer circle of the product thread and the outer circle of the clamping studs 1 and 2 will move along the arc, introducing errors. Based on the contact point change law and the diameter of the clamping studs, an error analysis and compensation model is established to achieve error compensation.

[0028] The advantages of this invention compared to the prior art are:

[0029] (1) The present invention uses a two-dimensional differential platform to realize the quantitative online adjustment of the initial engagement state of the clamping stud, thereby improving the detection accuracy.

[0030] (2) The upper and lower detection modules of the present invention are vertically distributed. The upper detection module relies on gravity to compact the threads of the product under inspection and self-center it, without the need for manual intervention, thus improving the stability of the inspection.

[0031] (3) The present invention uses a guide rail for vertical guidance, which has a large adjustable distance in the detection area, good guiding stability, and improves the compatibility of the thread size of the product to be inspected.

[0032] (4) The present invention uses a grating ruler to be connected to the upper detection module for follow-up, and the reading head moves synchronously with the upper detection module, which can realize real-time feedback of detection data, increase the detection range, and help improve the detection response speed and data stability.

[0033] (5) The present invention uses a minimum equilateral triangle distribution and a small clamping large inspection mode for clamping studs, which is conducive to establishing an error analysis and compensation model, realizing accurate compensation for the detection error introduced by the slippage of the contact point, and improving the detection accuracy.

[0034] (6) The error analysis and compensation model established by the present invention can compensate for the error of the threads of products under inspection of different specifications and sizes. When conducting comparative testing of the threads of products under inspection, only one standard part is needed to calibrate the threads of products of different sizes with the same pitch. Only one standard part is needed for calibration with the same pitch, which greatly reduces the number of standard parts and improves the compatibility of the device. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the detection device structure;

[0037] Figure 3 This is a schematic diagram of the initial state of the upper and lower detection modules;

[0038] Figure 4 This is a schematic diagram showing the engagement state of the clamping stud.

[0039] Figure 5 A schematic diagram of the smallest equilateral triangle at the center of the clamping stud;

[0040] Figure 6 A schematic diagram showing the changes in contact points of threads of different sizes to be inspected;

[0041] Figure 7 This is a schematic diagram of the detection model. Detailed Implementation

[0042] A high-precision meshing and error-compensated external thread compatible quantitative detection device, such as Figure 1 , Figure 2 and Figure 3As shown, the device includes a base 1, a back plate 2, ribs 3, a micro industrial computer 4, and a detection device 6. The back plate 2 and ribs 3 are perpendicular to each other and fixed to the base 1 by fasteners, thus keeping the back plate 2 perpendicular to the base 1. The micro industrial computer 4 is mounted on the upper end of the back plate 2 by fasteners and is used for human-machine interaction. The detection device 6 is connected to the back plate 2 and the base 1 by fasteners, parallel to the back plate 2 and installed at the center of the back plate 2, perpendicular to the base 1, and is used for high-precision quantitative detection of external threads. The detection device 6 includes a support plate 61, a guide rail 62, a slider 63, an upper bracket 64, an upper detection module 65, a lower bracket 66, and a two-dimensional differential plane. The system includes a platform 67, a lower detection module 68, a grating ruler 69, and a support plate 61, which is a high-precision marble flat plate connected to the back plate 2 via fasteners. Its lower end is flush with the base 1 to ensure the verticality of the guide rail. The guide rail 62 is connected to the support plate 61 via fasteners, parallel to the support plate 61 and installed at its center, for high-precision directional movement of the slider in the vertical direction. The slider 63 is slidably connected to the guide rail 62, allowing it to slide vertically along the guide rail 62. The upper bracket 64 is connected to the slider 63 via fasteners. The upper detection module 65 is mounted on the extension block 643 and can be moved by lifting the handle 641. The upper detection module 65 moves vertically along the guide rail 62. The lower support 66 is connected to the base 1 and the support plate 61, and is horizontal with respect to the guide rail 62. The two-dimensional differential platform 67 is connected to the lower support 66 via fasteners. The lower detection module 68 is connected to the two-dimensional differential platform 67 via fasteners. The two-dimensional differential platform 67 enables precise movement of the lower detection module 68 in the horizontal plane by quantitatively adjusting the horizontal adjustment rod 671 and the vertical adjustment rod 673 on it. The scale grating 692 of the grating ruler 69 is mounted on the support plate 61 and is parallel to the vertical direction of the guide rail 62. The reading head 691 is connected to the follower block via fasteners. The follower block 693 is connected to the left side of the extension block 643. When the upper detection module 65 moves in the vertical direction of the guide rail 62, the reading head 691 moves synchronously with the upper detection module 65 to provide detection data feedback. The upper detection module 65 includes an upper mounting base 651, a fixed clamping block 653, a clamping stud 652, a movable clamping block 654, and a locking screw 655. The upper mounting base 651 is mounted on the extension block 643 by fasteners. The fixed clamping block 653, the clamping stud 652, the movable clamping block 654, and the locking screw 655 are all mounted on the upper mounting base 651.The lower detection module 68 includes a lower mounting base 681, a fixed clamping block 684, a clamping stud 682, a clamping stud 683, a movable clamping block 685, and a locking screw 686. The lower mounting base 681 is connected to the two-dimensional differential platform 67 by fasteners. The fixed clamping block 684, the clamping stud 682, the clamping stud 683, the movable clamping block 685, and the locking screw 686 are all installed on the lower mounting base 681. The clamping studs 682 and 683 are tightly engaged. The clamping stud 682 and 683 form a detection area 5 between the clamping stud 682 and 683. The operator, based on the thread diameter of the product to be inspected, lifts the upper inspection module 65 using handle 641 to a height 2cm greater than the thread diameter of the product. The thread of the product is then placed into the inspection area 5, where it engages with the clamping studs 682 and 683 of the lower inspection module 68, maintaining a horizontal position. The upper inspection module 65 is then released, allowing its gravity to compact the thread of the product, thus achieving engagement between the upper and lower inspection modules 65 and 68. After the upper inspection module 65 is fully engaged, the reading on the grating ruler 69, which moves synchronously with the upper inspection module 65, will change accordingly, resulting in a measurement data value and completing the thread inspection. When inspecting threads of other sizes, simply lifting the upper inspection module 65 using handle 641 will suffice for measuring threads of other sizes.

[0043] like Figure 2 , Figure 3 and Figure 4 As shown, the lower detection module 68 is connected to the two-dimensional differential platform 67 via fasteners. The two-dimensional differential platform 67 can be moved laterally in the horizontal plane by adjusting the lateral adjustment rod 671. After reaching the predetermined position, it is locked by the lateral locking nut 672 to maintain the lower detection module 68 in the horizontal plane. The lower detection module 68 can be moved longitudinally in the horizontal plane by adjusting the longitudinal adjustment rod 673. After reaching the predetermined position, it is locked by the longitudinal locking nut 674 to maintain the lower detection module 68 in the vertical plane. Through the above operations, the lower detection module 68 can be directionally adjusted in the horizontal plane. The position of the two-dimensional differential platform 68 in the horizontal plane can be quantitatively adjusted online to achieve precise engagement between the clamping stud 1 652 of the upper detection module 65 and the clamping stud 2 682 and clamping stud 3 683 of the lower detection module 68. This is beneficial to improving the engagement accuracy between the thread of the product under inspection and the three clamping studs, and improving the convenience of adjustment and the reliability of engagement.

[0044] like Figure 2As shown, the upper detection module 65 is detachably connected to the extension block 643 via fasteners, and the lower detection module 68 is detachably connected to the two-dimensional differential platform 67 via fasteners. When inspecting the threads of different product models, the pitch of the thread on the clamping stud may not match the pitch of the thread of the product to be inspected. Disassembling the upper detection module 65 and the lower detection module 68 can enable quick replacement, which is beneficial to improving the efficiency of inspection and the compatibility of the device.

[0045] like Figure 3 and Figure 4 As shown, the clamping stud 652 of the upper detection module 65 and the clamping studs 682 and 683 of the lower detection module 68 use threads of the same specification and size, and their end faces are ground horizontally to ensure that the end faces of the three are parallel to the horizontal plane; this helps to improve the reliability of thread engagement during the detection process and the accuracy of the detection results.

[0046] like Figure 3 and Figure 4 As shown, the clamping studs 682 and 683 of the lower detection module 68 are tightly engaged. In their natural state, the degree of engagement between the two is high, and they are fixed using a fixed clamping block 684 and a movable clamping block 685. During the detection process, there is no need to adjust the engagement state of the clamping studs 682 and 683; they can be adjusted as a whole and engaged with the clamping stud 652, reducing the number of adjustments. At the same time, when the thread of the product to be inspected is placed in the lower detection module 68, the clamping studs 682 and 683 are tightly engaged in a V-shaped structure, which can achieve product self-centering, reduce the operator's adjustment process, and improve detection efficiency.

[0047] like Figure 2 As shown, the guide rail 62 is vertically and centrally mounted on the support plate 61, the slider 63 is slidably connected to the guide rail 62, the upper bracket 64 is fixedly connected to the slider 63, and the upper detection module 65 is detachably connected to the upper bracket 64. The upper detection module 65 can move directionally in the vertical direction, the detection area has a large adjustable distance, good guiding stability, and high compatibility with the thread size of the product to be inspected.

[0048] The upper detection module 65 is typically set to weigh 1kg. During the detection process, the upper detection module 65 can compact the product to be inspected by gravity without the need for manual intervention, thus improving the stability of the detection.

[0049] like Figure 3 and Figure 4As shown, the right side of the fixed clamping block 653 is set as an inclined surface, and the left side of the movable clamping block 654 is set as an inclined surface. The movable clamping block 654 and the upper mounting base 651 are provided with threaded holes. The locking screw 655 is screwed into the threaded hole and threadedly connected to the movable clamping block 654. Tightening the locking screw 655 can reduce the distance between the fixed clamping block 653 and the movable clamping block 654. The clamping stud 652 is fixed by limiting the inclined surface. The clamping studs 682 and 683 on the lower detection module 68 are fixed by limiting the same way. It can realize the quick replacement of clamping studs 652, 682 and 683; it is compatible with clamping studs of different sizes, improving the compatibility of the device.

[0050] like Figure 2 As shown, the scale grating 692 of the grating ruler 69 is mounted on the support plate 61 and kept parallel to the guide rail 62. The reading head 691 is connected to the left side of the extension block 643 of the upper bracket 64 by fasteners through the follower block 693. The data from the reading head 691 is transmitted to the micro industrial computer 4 through a cable. When the operator lifts the upper detection module 65 to perform thread detection, the reading head 691 moves synchronously with the upper detection module 65, thereby completing the real-time feedback of the movement data, which is beneficial to improving the detection response speed and data stability. The scale grating 692 is 20mm long, with a large detection range, which is beneficial to improving detection compatibility.

[0051] like Figure 2 As shown, the handle 641 is securely connected to the upper support 64 and remains vertical. The operator can quickly and directionally raise and lower the slider 63 by applying force to the handle 641, improving inspection efficiency.

[0052] like Figure 4 , Figure 5 As shown, clamping stud 2 682 and clamping stud 3 683 are tightly engaged. In the natural state, clamping stud 1 652 of the upper detection module 65 is engaged with clamping stud 2 682 and clamping stud 3 683. The three are of the same size and their centers form the smallest equilateral triangle.

[0053] like Figure 6 , Figure 7 As shown, when inspecting threads of products of different sizes, the contact point between the outer circle of the product thread and the outer circles of clamping studs 652 and 682 will move along the arc, introducing errors. Based on the contact point variation law and the diameter of the clamping studs, an error analysis and compensation model is established. The pitch diameter of clamping stud 652 is d1, the pitch diameters of clamping studs 682 and 683 are both d2, the pitch diameter of the standard part is d, the difference between the pitch diameter of the product thread and the standard part is λ, the pitch diameter of the product thread is d+λ, and the measured value of the standard part is S0. The measured value of the thread under inspection is S1. The difference between the measured value of the thread to be inspected and the measured value of the standard part: The pitch diameter d of the standard part thread, the pitch diameter d1 of clamping stud one 652, the pitch diameter d2 of clamping stud two 682 and clamping stud three 683 are obtained by measurement. Using the above model, based on the measured value S0 of the standard part and the measured value S1 of the thread to be inspected, λ is solved. d+λ is the pitch diameter value of the thread of the product to be inspected, thereby realizing error compensation.

[0054] When using the error compensation model to perform thread comparison testing on products under inspection, only one standard part is needed to calibrate the threads of products with the same pitch but different sizes. Only one standard part is needed for calibration of products with the same pitch, which greatly reduces the number of standard parts and improves the compatibility of the device.

[0055] When the diameter of the clamping stud is smaller than the thread of the product to be inspected, it is defined as the "small clamp large" mode. When the diameter of the clamping stud is greater than or equal to the thread of the product to be inspected, it is defined as the "large clamp small" mode. According to the established error analysis compensation model test, the detection error introduced by the "small clamp large" mode is less than the error introduced by the "large clamp small" mode. The larger the thread diameter of the product to be inspected, the smaller the detection error introduced. Therefore, the device can improve the detection accuracy by adopting the "small clamp large" mode.

[0056] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention based on the above-disclosed technical content without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A high-precision meshing and error-compensated external thread compatible quantitative detection device, characterized in that, include: The system consists of a base, a back plate, ribs, a micro industrial computer, and a testing device. The back plate is fixed to the base via ribs, ensuring that it is perpendicular to the base. The micro industrial computer is mounted on the upper part of the back plate via fasteners and is used for human-machine interaction. The testing device is connected to the back plate and the base via fasteners, is perpendicular to the base, parallel to the back plate, and installed at the center of the back plate. It is used to perform quantitative testing of external threads.

2. The high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 1, characterized in that, The detection device includes a support plate, a guide rail, a slider, an upper bracket, an upper detection module, a lower bracket, a two-dimensional differential platform, a lower detection module, and a grating ruler; The support plate is made of marble flat slab and is connected to the back plate by fasteners, with the lower end flush with the base; The guide rail is connected to the support plate by fasteners, and is parallel to the support plate and installed at the center of the support plate. The slider is slidably connected to the guide rail; The handle is connected to the upper part of the upper bracket by fasteners; The upper detection module is mounted on the extension block; The lower bracket is connected to the base and the support plate respectively, and its direction is horizontal with the guide rail; The extension block is connected to the lower part of the upper bracket by fasteners; The upper bracket is connected to the slider by fasteners and is used for supporting and positioning the extension block; The two-dimensional differential platform is connected to the lower support via fasteners; The lower detection module is connected to the two-dimensional differential platform via fasteners. The lower detection module can be moved in the horizontal plane by adjusting the horizontal and vertical adjustment rods on the two-dimensional differential platform. The scale grating of the grating ruler is mounted on the support plate and kept parallel to the guide rail. The reading head is connected to the left side of the extension block of the upper bracket through the follower block. During thread detection, the reading head moves synchronously with the upper detection module to complete the real-time detection and feedback of movement data.

3. The high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 2, characterized in that, The upper detection module includes an upper mounting base, a fixed clamping block, a clamping stud, a movable clamping block, and a locking screw. The upper mounting base is mounted on the extension block by fasteners and is used for the installation and positioning of the clamping stud. The fixed clamping block, the clamping stud, the movable clamping block, and the locking screw are all mounted on the upper mounting base. The lower detection module includes a lower mounting base, a fixed clamping block two, a clamping stud two, a clamping stud three, a movable clamping block two, and a locking screw two. The lower mounting base is connected to the two-dimensional differential platform via fasteners. The fixed clamping block two, the clamping stud two, the clamping stud three, the movable clamping block two, and the locking screw two are all installed on the lower mounting base for the installation and fixation of the clamping stud two and the clamping stud three. The clamping stud two and the clamping stud three are tightly engaged. A detection area is formed between the clamping stud one and the clamping stud two and the clamping stud three.

4. The high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 3, characterized in that, During testing, the upper testing module is raised to a height 2-3 cm greater than the thread diameter of the product to be tested. The thread of the product to be tested is placed in the testing area and engaged with the clamping studs two and three of the lower testing module, maintaining a horizontal position. Then, the upper testing module is released, and its gravity compacts the thread of the product to be tested, achieving engagement between the upper and lower testing modules. After the upper testing module is finally compacted and engaged, the reading of the grating ruler, which moves synchronously with the upper testing module, changes accordingly, thereby obtaining the measurement data value and completing the testing of the product thread.

5. A high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 2, characterized in that, The lower detection module is connected to the two-dimensional differential platform via fasteners. The two-dimensional differential platform moves the lower detection module in the horizontal plane by adjusting the horizontal and vertical adjustment rods on it. The position of the two-dimensional differential platform in the horizontal plane is adjusted online to achieve the engagement of the clamping stud one of the upper detection module with the clamping stud two and clamping stud three of the lower detection module.

6. The high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 2, characterized in that, The upper detection module is detachably connected to the extension block via fasteners, and the lower detection module is detachably connected to the two-dimensional differential platform via fasteners; when detecting threads of different product models, the upper and lower detection modules can be replaced by disassembling them.

7. A high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 2, characterized in that, The clamping studs 1 of the upper detection module and 2 and 3 of the lower detection module use threads of the same specification and size, and their end faces are ground horizontally to ensure that the end faces of the three are parallel to the horizontal plane.

8. A high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 2, characterized in that, The clamping studs two and three of the lower detection module are tightly engaged and fixed using a clamping block.

9. A high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 2, characterized in that, The diameters of clamping stud one, clamping stud two, and clamping stud three are all smaller than the thread diameter of the product to be inspected.

10. A high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 2, characterized in that, The guide rail is vertically centered on the support plate, the slider is slidably connected to the guide rail, the upper bracket is fixedly connected to the slider, and the upper detection module is detachably connected to the upper bracket.

11. A high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 3, characterized in that, The movable clamping block 1 and the upper mounting base are provided with threaded holes. The locking screw 1 is screwed into the threaded hole and threadedly connected to the movable clamping block 1. Tightening the locking screw 1 reduces the distance between the fixed clamping block 1 and the movable clamping block 1 and limits and fixes the clamping stud 1. The clamping stud 2 and clamping stud 3 on the lower detection module are limited and fixed in the same way.

12. A high-precision meshing and error-compensated external thread compatible quantitative detection device according to claim 3, characterized in that, The clamping studs 2 and 3 of the lower detection module are tightly engaged; in the natural state, the clamping stud 1 of the upper detection module is engaged with the clamping studs 2 and 3 of the lower detection module, and the three are of the same size and form an equilateral triangle.

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