Nut groove curvature inner diameter dimension detection structure

Abstract

The utility model discloses a nut groove curvature inner diameter dimension detection structure, and relates to the technical field of dimension detection. The nut groove curvature inner diameter dimension detection structure comprises a base, a nut installation mechanism, a measurement mechanism and a movement mechanism. The nut mounting mechanism, the measuring mechanism and the moving mechanism are sequentially arranged on the base. The nut mounting mechanism is used for fixing the nut, the movement mechanism is used for driving the measuring mechanism to abut against the contour of the nut channel to measure the curvature inner diameter size of the nut channel, the measurement is more stable and higher in precision than a manual measurement mode, manipulation errors during detection by different persons are reduced, the influence of human factors is reduced, and the measurement accuracy is improved. Measurement errors caused by the fact that the nut cannot be fixed are avoided, and the measuring mechanism can adapt to replacement of the detected nut and is suitable for detection of nuts in various shapes.

Description

Technical Field

[0001] This application relates to the technical field of dimensional inspection, and particularly to a detection structure for the inner diameter of the nut groove curvature. Background Art

[0002] In a tooling, a slide rail and a lead screw connect various components together. Under the elastic force of a spring, two measuring heads are opened, and by manually adjusting the positions of the measuring heads, the middle diameter of the nut groove is measured. The measurement is displayed by a micrometer, and the accuracy of the measurement and the consistency of repeated measurements are ensured by the elastic force of the spring and the movement accuracy of the preloaded slide rail. In the above-mentioned manual measurement method, when manually adjusting the two measuring heads to find the nut groove, there are human factors affecting the manual search for the nut groove as the measurement point, and the accuracy of repeated measurements is not high. Utility Model Content

[0003] The embodiment of this application provides a detection structure for the inner diameter of the nut groove curvature, which can solve the technical problem that when manually measuring a nut with a micrometer, there are human factors affecting the manual search for the nut groove as the measurement point, and the accuracy of repeated measurements is not high.

[0004] The embodiment of this application provides a detection structure for the inner diameter of the nut groove curvature, including a base, a nut installation mechanism, a measurement mechanism, and a movement mechanism; the nut installation mechanism, the measurement mechanism, and the movement mechanism are arranged in sequence on the base;

[0005] The nut installation mechanism includes a nut fixing seat and a sliding adjustment mechanism; the sliding adjustment mechanism is arranged on the base, the nut fixing seat has a fixing cavity for fixing the nut, the nut fixing seat is slidably arranged along the sliding adjustment mechanism, and the sliding adjustment mechanism drives the nut fixing seat to slide so that the nut to be measured moves;

[0006] The measurement mechanism includes a first measurement part and a second measurement part arranged oppositely; the first measurement part includes a first sliding seat, a first micrometer, and a first measuring rod, the first micrometer and the first measuring rod are fixed on the first sliding seat, and the first sliding seat is slidably connected to the base along a direction perpendicular to the sliding adjustment mechanism; the second measurement part includes a second sliding seat, a second micrometer, and a second measuring rod, the second micrometer and the second measuring rod are fixed on the second sliding seat, and the second sliding seat is slidably connected to the base along a direction perpendicular to the sliding adjustment mechanism; the first sliding seat and the second sliding seat are on the same straight line, and the first measuring rod and the second measuring rod are on the side adjacent to the nut installation mechanism;

[0007] The motion mechanism includes a first driving mechanism and a second driving mechanism; the first driving mechanism is connected to the first sliding seat, the second driving mechanism is connected to the second sliding seat, and the first driving mechanism and the second driving mechanism drive the first sliding seat and the second sliding seat to move towards each other, so as to drive the first measuring rod and the second measuring rod to extend into the fixed cavity and abut against the groove profile of the nut to be measured, or the first driving mechanism and the second driving mechanism drive the first sliding seat and the second sliding seat to move away from each other, so that the positions of the first measuring rod and the second measuring rod are separated from the fixed cavity and the nut to be measured.

[0008] Further, the sliding adjustment mechanism includes a first guide rail, a first base, a second guide rail, a second base, a first handwheel and a first lead screw. The first guide rail and the second guide rail are arranged in parallel. The first base is slidably arranged on the first guide rail, the second base is slidably arranged on the second guide rail, the first lead screw is arranged in parallel between the first guide rail and the second guide rail, and the first handwheel is located at one end of the first lead screw away from the measuring mechanism; rotating the first handwheel drives the first lead screw to push the nut fixing seat to move on the first guide rail and the second guide rail so as to move the nut to be measured.

[0009] Further, the nut fixing seat includes a V-shaped block and a fixing rod. The fixing rod is hinged to the V-shaped block, and a fixed cavity is formed between the fixing rod and the V-shaped block. Two sides of the V-shaped block are respectively connected to the first base and the second base, and the V-shaped block is threadedly connected to the first lead screw.

[0010] Further, the nut fixing seat further includes a pressing block and a tension spring. The V-shaped block is provided with a U-shaped groove for accommodating the nut. The U-shaped groove and the fixing rod clamp the nut, and the pressing block is stretched by the tension spring to press the nut tightly in the U-shaped groove.

[0011] Further, the first sliding seat includes a first slide rail structure and a first sliding base. The first slide rail structure is perpendicular to the first guide rail, and the first sliding base is slidably arranged on the first slide rail structure; the second sliding seat includes a second slide rail structure and a second sliding base. The second slide rail structure is perpendicular to the second guide rail, and the second sliding base is slidably arranged on the second slide rail structure.

[0012] Further, the first dial indicator and the first measuring rod are fixed on the first sliding base. The head of the first dial indicator abuts against the head indexing block of the first dial indicator. The spring on the head indexing block of the first dial indicator and the elastic force of the head of the first dial indicator are used to explore and measure the contour of the nut groove. The second dial indicator and the second measuring rod are fixed on the second sliding base. The head of the second dial indicator abuts against the head indexing block of the second dial indicator. The spring on the head indexing block of the second dial indicator and the elastic force of the head of the second dial indicator are used to explore and measure the contour of the nut groove.

[0013] Further, the first measuring rod includes a first rod body and a first measuring head. The first rod body is fixed on the first sliding base. The first rod body extends towards the nut mounting mechanism. The first measuring head is located at the end of the first rod body towards the nut mounting mechanism. The second measuring rod includes a second rod body and a second measuring head. The second rod body is fixed on the second sliding base. The second rod body extends towards the nut mounting mechanism. The second measuring head is located at the end of the second rod body towards the nut mounting mechanism. The first rod body and the second rod body are arranged in parallel.

[0014] Further, the first driving mechanism includes a first motion guide rail structure, a first motion push rod, a first adjusting screw rod, and a first adjusting hand wheel. The first motion guide rail structure is perpendicular to the first slide rail structure. The first motion push rod is slidably arranged on the first motion guide rail structure. The first adjusting screw rod is arranged in parallel with the first motion guide rail structure. The first adjusting hand wheel is connected to the first adjusting screw rod. The first motion push rod is threadedly connected to the first adjusting screw rod. The first motion push rod abuts against the first sliding base. By rotating the first adjusting hand wheel, the first motion push rod is driven to push the first sliding base to adjust the position of the first measuring rod.

[0015] Further, the second driving mechanism includes a second motion guide rail structure, a second motion push rod, a second adjusting screw rod, and a second adjusting hand wheel. The second motion guide rail structure is perpendicular to the second slide rail structure. The second motion push rod is slidably arranged on the second motion guide rail structure. The second adjusting screw rod is arranged in parallel with the second motion guide rail structure. The second adjusting hand wheel is connected to the second adjusting screw rod. The second motion push rod is threadedly connected to the second adjusting screw rod. The second motion push rod abuts against the second sliding base. By rotating the second adjusting hand wheel, the second motion push rod is driven to push the second sliding base to adjust the position of the second measuring rod.

[0016] Further, a first roller is provided on the first sliding base, and a first conical surface portion is provided on the first moving push rod corresponding to the first roller, and the first conical surface portion abuts against the first roller; a second roller is provided on the second sliding base, and a second conical surface portion is provided on the second moving push rod corresponding to the second roller, and the second conical surface portion abuts against the second roller. When the first moving push rod moves, the first conical surface portion drives the first roller to roll, thereby pushing the first sliding base to move to adjust the position of the first measuring rod. When the second moving push rod moves, the second conical surface portion drives the second roller to roll, thereby pushing the second sliding base to move to adjust the position of the second measuring rod.

[0017] The nut groove curvature inner diameter size detection structure provided by the embodiment of the present application fixes the nut through the nut installation mechanism, and uses the motion mechanism to drive the measuring mechanism to abut against the nut groove contour to realize the measurement of the nut groove curvature inner diameter size. It is more stable and accurate than the manual measurement method, reduces the manipulation error during detection by different personnel, reduces the influence of human factors, avoids the measurement error caused by the inability to fix the nut, and the measuring mechanism can adapt to the replacement of the nut to be detected, and is applicable to the detection of nuts of various shapes. Brief Description of the Drawings

[0018] The following will, in conjunction with the drawings, make the technical solutions and other beneficial effects of the present application obvious through a detailed description of the specific embodiments of the present application.

[0019] Figure 1 It is a schematic structural diagram of the nut groove curvature inner diameter size detection structure provided by the embodiment of the present application.

[0020] Figure 2 It is a schematic structural diagram of the nut installation mechanism provided by the embodiment of the present application.

[0021] Figure 3 It is a sectional view of the nut installation mechanism provided by the embodiment of the present application.

[0022] Figure 4 It is a schematic combined structural diagram of the measuring mechanism and the motion mechanism provided by the embodiment of the present application.

[0023] Figure 5 It is a schematic disassembled structural diagram of the measuring mechanism and the motion mechanism provided by the embodiment of the present application.

[0024] The labels in the figure are as follows:

[0025] Base 1, nut installation mechanism 2, nut fixing seat 21, V-shaped block 211, fixing rod 212, pressing block 213, tension spring 214, sliding adjustment mechanism 22, first guide rail 221, first base 222, second guide rail 223, second base 224, first handwheel 225, first lead screw 226, measuring mechanism 3, first measuring part 31, first sliding seat 311, first sliding rail structure 3111, first sliding base 3112, first roller 3113, first dial indicator 312, first measuring rod 313, first rod body 3131, first measuring head 3132, second measuring part 32, second sliding seat 321, second sliding rail structure 3211, second sliding base 3212, second roller 3213, second dial indicator 322, second measuring rod 323, second rod body 3231, second measuring head 3232, motion mechanism 4, first driving mechanism 41, first motion guide rail structure 411, first motion push rod 412, first conical surface part 4121, first adjusting lead screw 413, first adjusting handwheel 414, second driving mechanism 42, second motion guide rail structure 421, second motion push rod 422, second conical surface part 4221, second adjusting lead screw 423, second adjusting handwheel 424. Detailed implementation manner

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0027] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] Specifically, please refer to Figures 1 to 5 , the embodiment of the present application provides a nut groove curvature inner diameter size detection structure, and the nut groove curvature inner diameter size detection structure can measure the nut groove curvature inner diameter size.

[0029] The nut groove curvature inner diameter dimension detection structure includes a base 1, a nut installation mechanism 2, a measurement mechanism 3, and a motion mechanism 4; the nut installation mechanism 2, the measurement mechanism 3, and the motion mechanism 4 are arranged in sequence on the base 1;

[0030] The nut installation mechanism 2 includes a nut fixing seat 21 and a sliding adjustment mechanism 22; the sliding adjustment mechanism 22 is arranged on the base 1, the nut fixing seat 21 has a fixing cavity for fixing the nut, the nut fixing seat 21 is slidably arranged along the sliding adjustment mechanism 22, and the sliding adjustment mechanism 22 drives the nut fixing seat 21 to slide so that the nut to be measured moves;

[0031] The measurement mechanism 3 includes a first measurement part 31 and a second measurement part 32 arranged oppositely; the first measurement part 31 includes a first sliding seat 311, a first micrometer 312, and a first measuring rod 313, the first micrometer 312 and the first measuring rod 313 are fixed on the first sliding seat 311, and the first sliding seat 311 is slidably connected to the base 1 along a direction perpendicular to the sliding adjustment mechanism 22; the second measurement part 32 includes a second sliding seat 321, a second micrometer 322, and a second measuring rod 323, the second micrometer 322 and the second measuring rod 323 are fixed on the second sliding seat 321, and the second sliding seat 321 is slidably connected to the base 1 along a direction perpendicular to the sliding adjustment mechanism 22; the first sliding seat 311 and the second sliding seat 321 are on the same straight line, and the first measuring rod 313 and the second measuring rod 323 are on the side adjacent to the nut installation mechanism 2;

[0032] The motion mechanism 4 includes a first driving mechanism 41 and a second driving mechanism 42; the first driving mechanism 41 is connected to the first sliding seat 311, the second driving mechanism 42 is connected to the second sliding seat 321, and the first driving mechanism 41 and the second driving mechanism 42 drive the first sliding seat 311 and the second sliding seat 321 to move towards each other, so as to drive the first measuring rod 313 and the second measuring rod 323 to extend into the fixing cavity to abut against the groove profile of the nut to be measured, or the first driving mechanism 41 and the second driving mechanism 42 drive the first sliding seat 311 and the second sliding seat 321 to move away from each other, so as to drive the positions of the first measuring rod 313 and the second measuring rod 323 to move away from the fixing cavity and separate from the nut to be measured.

[0033] Further, the sliding adjustment mechanism 22 includes a first guide rail 221, a first base 222, a second guide rail 223, a second base 224, a first handwheel 225, and a first lead screw 226. The first guide rail 221 is arranged in parallel with the second guide rail 223. The first base 222 is slidably arranged on the first guide rail 221. The second base 224 is slidably arranged on the second guide rail 223. The first lead screw 226 is arranged in parallel between the first guide rail 221 and the second guide rail 223. The first handwheel 225 is located at one end of the first lead screw 226 away from the measuring mechanism 3.

[0034] Further, the nut fixing seat 21 includes a V-shaped block 211 and a fixing rod 212. The fixing rod 212 is hinged to the V-shaped block 211. A fixing cavity is formed between the fixing rod 212 and the V-shaped block 211. Two sides of the V-shaped block 211 are respectively connected to the first base 222 and the second base 224. The V-shaped block 211 is threadedly connected to the first lead screw 226.

[0035] The fixing rod 212 is magnetically fixed to the base.

[0036] Further, the nut fixing seat 21 further includes a pressing block 213 and a tension spring 214. The V-shaped block 211 is provided with a U-shaped groove for accommodating the nut. The U-shaped groove and the fixing rod 212 clamp the nut. The pressing block 213 is stretched by the tension spring 214 to press the nut tightly in the U-shaped groove.

[0037] Specifically, when placing the nut, first open the fixing rod 212, then pull open the pressing block 213, place the nut in the U-shaped groove, release the pressing block 213, and lower the fixing rod 212 to fix the nut.

[0038] By rotating the first handwheel 225 to drive the first lead screw 226 to push the V-shaped block 211 to move on the first guide rail 221 and the second guide rail 223, the position of the nut is adjusted accordingly.

[0039] Further, the first sliding seat 311 includes a first slide rail structure 3111 and a first sliding base 3112. The first slide rail structure 3111 is arranged perpendicular to the first guide rail 221. The first sliding base 3112 is slidably arranged on the first slide rail structure 3111. The second sliding seat 321 includes a second slide rail structure 3211 and a second sliding base 3212. The second slide rail structure 3211 is arranged perpendicular to the second guide rail 223. The second sliding base 3212 is slidably arranged on the second slide rail structure 3211.

[0040] Further, the first dial indicator 312 and the first measuring rod 313 are fixed on the first sliding base 3112. The head of the first dial indicator 312 abuts against the head indexing block of the first dial indicator 312. The spring on the head indexing block of the first dial indicator 312 and the elastic force of the head of the first dial indicator 312 are used to explore and measure the nut groove profile. The second dial indicator 322 and the second measuring rod 323 are fixed on the second sliding base 3212. The head of the second dial indicator 322 abuts against the head indexing block of the second dial indicator 322. The spring on the head indexing block of the second dial indicator 322 and the elastic force of the head of the second dial indicator 322 are used to explore and measure the lowest point of the nut groove.

[0041] Further, the first measuring rod 313 includes a first rod body 3131 and a first measuring head 3132. The first rod body 3131 is fixed on the first sliding base 3112. The first rod body 3131 extends towards the nut mounting mechanism 2. The first measuring head 3132 is located at the end of the first rod body 3131 facing the nut mounting mechanism 2. The second measuring rod 323 includes a second rod body 3231 and a second measuring head 3232. The second rod body 3231 is fixed on the second sliding base 3212. The second rod body 3231 extends towards the nut mounting mechanism 2. The second measuring head 3232 is located at the end of the second rod body 3231 facing the nut mounting mechanism 2. The first rod body 3131 and the second rod body 3231 are arranged in parallel.

[0042] Further, the first driving mechanism 41 includes a first motion guide structure 411, a first motion push rod 412, a first adjusting screw rod 413 and a first adjusting handwheel 414. The first motion guide structure 411 is perpendicular to the first slide rail structure 3111. The first motion push rod 412 is slidably arranged on the first motion guide structure 411. The first adjusting screw rod 413 is arranged in parallel with the first motion guide structure 411. The first adjusting handwheel 414 is connected to the first adjusting screw rod 413. The first motion push rod 412 is threadedly connected to the first adjusting screw rod 413. The first motion push rod 412 abuts against the first sliding base 3112. By rotating the first adjusting handwheel 414, the first motion push rod 412 is driven to push the first sliding base 3112 to adjust the position of the first measuring rod 313, so that the first measuring rod 313 abuts against the nut groove.

[0043] Further, the second driving mechanism 42 includes a second movement guide rail structure 421, a second movement push rod 422, a second adjustment screw rod 423, and a second adjustment handwheel 424. The second movement guide rail structure 421 is perpendicularly arranged with the second slide rail structure 3211. The second movement push rod 422 is slidably arranged on the second movement guide rail structure 421. The second adjustment screw rod 423 is arranged in parallel with the second movement guide rail structure 421. The second adjustment handwheel 424 is connected to the second adjustment screw rod 423. The second movement push rod 422 is threadedly connected to the second adjustment screw rod 423. The second movement push rod 422 abuts against the second sliding base 3212. By rotating the second adjustment handwheel 424, the second movement push rod 422 is driven to push the second sliding base 3212 to adjust the position of the second measuring rod 323, so that the second measuring rod 323 abuts against the nut groove.

[0044] Further, a first roller 3113 is arranged on the first sliding base 3112. The first movement push rod 412 is provided with a first conical surface portion 4121 corresponding to the first roller 3113, and the first conical surface portion 4121 abuts against the first roller 3113. A second roller 3213 is arranged on the second sliding base 3212. The second movement push rod 422 is provided with a second conical surface portion 4221 corresponding to the second roller 3213, and the second conical surface portion 4221 abuts against the second roller 3213. The first roller 3113 and the second roller 3213 are arranged adjacent to each other, and the first conical surface portion 4121 and the second conical surface portion 4221 are located on both sides of the first roller 3113 and the second roller 3213.

[0045] Wherein, when the first movement push rod 412 moves, the first conical surface portion 4121 drives the first roller 3113 to roll, thereby pushing the first sliding base 3112 to move to adjust the position of the first measuring rod 313. When the second movement push rod 422 moves, the second conical surface portion 4221 drives the second roller 3113 to roll, thereby pushing the second sliding base 3212 to move to adjust the position of the second measuring rod 323. The rolling contact achieves the effect of slow adjustment. The slow adjustment methods of the first conical surface portion 4121, the second conical surface portion 4221, the first adjustment screw rod 413, and the second adjustment screw rod 423 can prevent the first measuring head 3132 and the second measuring head 3232 from impacting the nut groove, resulting in inaccurate measurement, and improve the repeat positioning accuracy within 0.005 mm.

[0046] After the first probe 3132 and the second probe 3232 are abutted against the nut groove profile, the values of the first micrometer 312 and the second micrometer 322 are read by continuously rotating the first handwheel 225. The sum of the maximum value of the first micrometer 312 and the maximum value of the second micrometer 322 is the groove curvature diameter of the nut.

[0047] The detection method of the nut groove curvature inner diameter size detection structure provided by an embodiment of the present application includes the following steps:

[0048] 1. Install the nut to be measured in the fixed cavity of the nut installation mechanism.

[0049] 2. Rotate the first adjustment handwheel 414 and the second adjustment handwheel 424 to drive the first moving push rod 412 and the second moving push rod 422 to move. The first roller 3113 of the measuring mechanism is pushed to roll through the first conical surface portion 4121, and the second roller 3213 of the measuring mechanism is pushed to roll through the second conical surface portion 4221, so that the first sliding base 3112 and the second sliding base 3212 of the measuring mechanism are combined.

[0050] 3. Rotate the first handwheel 225 to move the nut to be measured so that the first probe 3132 and the second probe 3232 are aligned with the nut groove to be measured.

[0051] 4. Rotate the first adjustment handwheel 414 and the second adjustment handwheel 424 to drive the first moving push rod 412 and the second moving push rod 422 to move. The first roller 3113 of the measuring mechanism is pushed to roll through the first conical surface portion 4121, and the second roller 3213 of the measuring mechanism is pushed to roll through the second conical surface portion 4221, so that the first sliding base 3112 and the second sliding base 3212 of the measuring mechanism are separated.

[0052] 5. Rotate the first handwheel 225, and find the lowest point of the groove of the nut to be measured by reading the first micrometer 312 and the second micrometer 322, so as to obtain the groove curvature inner diameter value of the nut to be measured and complete the detection.

[0053] 6. Rotate the first adjustment handwheel 414 and the second adjustment handwheel 424 to drive the first moving push rod 412 and the second moving push rod 422 to move. The first roller 3113 of the measuring mechanism is pushed to roll through the first conical surface portion 4121, and the second roller 3213 of the measuring mechanism is pushed to roll through the second conical surface portion 4221, so that the first sliding base 3112 and the second sliding base 3212 of the measuring mechanism are combined.

[0054] 7. Rotate the first handwheel 225 to move the nut with the completed measurement away from the first probe 3132 and the second probe 3232, and remove the nut. The nut groove curvature inner diameter size detection structure provided by the embodiment of the present application fixes the nut through the nut installation mechanism, and uses the motion mechanism to drive the measurement mechanism to abut against the nut groove profile to realize the measurement of the nut groove curvature inner diameter size. It is more stable and has higher precision than the manual measurement method, reduces the manipulation error during detection by different personnel, reduces the influence of human factors, avoids the measurement error caused by the inability to fix the nut, the measurement mechanism can adapt to the replacement of the nut to be detected, and is applicable to the detection of nuts of various shapes.

[0055] This application of the present application is more stable and has higher precision than the handheld type, with a positioning precision of 0.003 mm; it is faster than the handheld measurement, and the efficiency is increased by 95%; it reduces the manipulation error during detection by different personnel, and the repeat positioning precision is within 0.005 mm.

[0056] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0057] The above has introduced in detail a nut groove curvature inner diameter size detection structure provided by the embodiments of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A detection structure for the inner diameter size of the nut groove curvature, characterized in that It includes a base, a nut mounting mechanism, a measuring mechanism and a motion mechanism; the nut mounting mechanism, the measuring mechanism and the motion mechanism are arranged in sequence on the base; The nut mounting mechanism includes a nut fixing seat and a sliding adjustment mechanism; the sliding adjustment mechanism is arranged on the base, the nut fixing seat has a fixing cavity for fixing the nut, the nut fixing seat is slidably arranged along the sliding adjustment mechanism, and the sliding adjustment mechanism drives the nut fixing seat to slide so that the nut to be measured moves; The measuring mechanism includes a first measuring part and a second measuring part arranged oppositely; the first measuring part includes a first sliding seat, a first micrometer and a first measuring rod, the first micrometer and the first measuring rod are fixed on the first sliding seat, and the first sliding seat is slidably connected to the base along a direction perpendicular to the sliding adjustment mechanism; the second measuring part includes a second sliding seat, a second micrometer and a second measuring rod, the second micrometer and the second measuring rod are fixed on the second sliding seat, and the second sliding seat is slidably connected to the base along a direction perpendicular to the sliding adjustment mechanism; the first measuring rod and the second measuring rod are located on one side of the nut mounting mechanism; The motion mechanism includes a first driving mechanism and a second driving mechanism; the first driving mechanism is connected to the first sliding seat, the second driving mechanism is connected to the second sliding seat, and the first driving mechanism and the second driving mechanism drive the first sliding seat and the second sliding seat to move towards each other, so as to drive the first measuring rod and the second measuring rod to extend into the fixing cavity to abut against the groove profile of the nut to be measured, or the first driving mechanism and the second driving mechanism drive the first sliding seat and the second sliding seat to move away from each other, so that the positions of the first measuring rod and the second measuring rod are separated from the fixing cavity and the nut to be measured.

2. The nut groove curvature inner diameter dimension detection structure according to claim 1, characterized in that, The sliding adjustment mechanism includes a first guide rail, a first base, a second guide rail, a second base, a first handwheel and a first lead screw. The first guide rail and the second guide rail are arranged in parallel. The first base is slidably arranged on the first guide rail, the second base is slidably arranged on the second guide rail. The first lead screw is arranged in parallel between the first guide rail and the second guide rail. The first handwheel is located at one end of the first lead screw away from the measuring mechanism; rotating the first handwheel drives the first lead screw to push the nut fixing seat to move on the first guide rail and the second guide rail so that the nut to be measured moves.

3. The nut groove curvature inner diameter size detection structure according to claim 2, characterized in that, The nut fixing seat includes a V-shaped block and a fixing rod. The fixing rod is hinged to the V-shaped block, and the fixing cavity is formed between the fixing rod and the V-shaped block. Both sides of the V-shaped block are respectively connected to the first base and the second base, and the V-shaped block is threadedly connected to the first lead screw.

4. The nut groove curvature inner diameter dimension detection structure according to claim 3, wherein, The nut fixing seat further includes a pressing block and a tension spring. The V-shaped block is provided with a U-shaped groove for accommodating the nut. The U-shaped groove and the fixing rod clamp the nut, and the pressing block is stretched by the tension spring to press the nut tightly in the U-shaped groove.

5. The nut groove curvature inner diameter size detection structure according to claim 3, characterized in that, The first sliding seat includes a first rail structure and a first sliding base. The first rail structure is perpendicular to the first guide rail, and the first sliding base is slidably arranged on the first rail structure; the second sliding seat includes a second rail structure and a second sliding base. The second rail structure is perpendicular to the second guide rail, and the second sliding base is slidably arranged on the second rail structure.

6. The nut groove curvature inner diameter dimension detection structure according to claim 5, characterized in that, The first dial indicator and the first measuring rod are fixed on the first sliding base. The measuring head of the first dial indicator abuts against the dial head indexing block of the first dial indicator. The contour of the nut groove is explored and measured by the spring on the dial head indexing block of the first dial indicator and the elastic force of the measuring head of the first dial indicator; the second dial indicator and the second measuring rod are fixed on the second sliding base. The measuring head of the second dial indicator abuts against the dial head indexing block of the second dial indicator. The contour of the nut groove is explored and measured by the spring on the dial head indexing block of the second dial indicator and the elastic force of the measuring head of the second dial indicator.

7. The nut groove curvature inner diameter dimension detection structure according to claim 5, wherein, The first measuring rod includes a first rod body and a first measuring head. The first rod body is fixed on the first sliding base. The first rod body extends towards the nut mounting mechanism. The first measuring head is located at the end of the first rod body towards the nut mounting mechanism; the second measuring rod includes a second rod body and a second measuring head. The second rod body is fixed on the second sliding base. The second rod body extends towards the nut mounting mechanism. The second measuring head is located at the end of the second rod body towards the nut mounting mechanism; the first rod body and the second rod body are arranged in parallel.

8. The nut groove curvature inner diameter size detection structure according to claim 5, characterized in that, The first driving mechanism includes a first motion rail structure, a first motion push rod, a first adjusting screw rod and a first adjusting handwheel. The first motion rail structure is perpendicular to the first rail structure. The first motion push rod is slidably arranged on the first motion rail structure. The first adjusting screw rod is arranged in parallel with the first motion rail structure. The first adjusting handwheel is connected to the first adjusting screw rod. The first motion push rod is threadedly connected to the first adjusting screw rod. The first motion push rod abuts against the first sliding base. By rotating the first adjusting handwheel, the first motion push rod is driven to push the first sliding base to adjust the position of the first measuring rod.

9. The nut groove curvature inner diameter dimension detection structure according to claim 8, characterized in that, The second driving mechanism includes a second motion rail structure, a second motion push rod, a second adjusting screw rod and a second adjusting handwheel. The second motion rail structure is perpendicular to the second rail structure. The second motion push rod is slidably arranged on the second motion rail structure. The second adjusting screw rod is arranged in parallel with the second motion rail structure. The second adjusting handwheel is connected to the second adjusting screw rod. The second motion push rod is threadedly connected to the second adjusting screw rod. The second motion push rod abuts against the second sliding base. By rotating the second adjusting handwheel, the second motion push rod is driven to push the second sliding base to adjust the position of the second measuring rod.

10. The nut groove curvature inner diameter dimension detection structure according to claim 9, characterized in that, A first roller is provided on the first sliding base, and a first conical surface portion is provided on the first moving push rod corresponding to the first roller, and the first conical surface portion abuts against the first roller; a second roller is provided on the second sliding base, and a second conical surface portion is provided on the second moving push rod corresponding to the second roller, and the second conical surface portion abuts against the second roller. The movement of the first moving push rod causes the first conical surface portion to drive the first roller to roll, thereby pushing the first sliding base to move to adjust the position of the first measuring rod. The movement of the second moving push rod causes the second conical surface portion to drive the second roller to roll, thereby pushing the second sliding base to move to adjust the position of the second measuring rod.

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