A stabilizing device for internal thread measuring instrument and a verification measurement method thereof

Abstract

The invention relates to the technical field of measuring the middle diameter of an internal thread, and specifically to a stabilizing device for an internal thread measuring instrument and a verification measurement method thereof, the device comprising a shell, a fixed measuring rod and a display instrument installed on the shell, the fixed measuring rod being slidably connected to a movable measuring rod, the movable measuring rod being meshed with a precision gear through a precision rack, and the precision gear being fixedly connected to a pointer; the shell is slidably connected to an upper counterweight base, a left horizontal electric telescopic arm is fixedly connected to the fixed measuring rod, and a right horizontal electric telescopic arm is fixedly connected to the movable measuring rod; the upper counterweight base is rotatably sleeved with a lower counterweight base, the lower counterweight base is installed with a central vertical electric telescopic arm and a connecting shaft, the central vertical electric telescopic arm being meshed with a branch gear through a rack arm; the method enables a ball nut to be clamped at the center position of the measuring base, and after the upper counterweight base is rotated, the connecting line between the fixed measuring rod and the movable measuring rod in a top-down direction coincides with the diameter of the measuring base, thereby preventing manual errors and offsets and improving the accuracy of measurement.

Description

Technical Field

[0001] The invention relates to the technical field of internal thread pitch diameter measurement, and in particular to an internal thread measuring instrument stabilizing device and a verification measurement method thereof. Background Art

[0002] The mid-diameter size of the ball nut is designed to be the diameter of an imaginary cylinder coaxial with the spiral raceway of the nut, whose upper and lower generatrix pass through the center of a steel ball with a standard size that acts on the raceway. In order to accurately and quickly measure the mid-diameter size, the conventional method for measuring the mid-diameter of a ball nut in the prior art is to cut the nut open, use a profilometer to climb the profile, and then automatically calculate the mid-diameter value, which is inefficient and will damage the workpiece.

[0003] Chinese patent CN 217058617U discloses a device for measuring the middle diameter of the internal thread of a ball nut, comprising a second measuring end, a right movable plate, a left movable plate and a support seat, the front side surface of the second measuring end is provided with a second scale line, the right movable plate is installed at the left end of the front shaft rod sleeved by the center of the first measuring end, and the middle part of the front side surface of the first measuring end is provided with a first scale line; the left movable plate is installed at the middle part of the front shaft rod sleeved by the center of the first measuring end, and the left end of the front shaft rod is installed with a front shaft sleeve, and the right movable plate and the left movable plate are arranged opposite to each other on the left and right; the left positioning rod and the right positioning rod are abutted against the inner side wall of the ball nut, so that the middle diameter of the ball nut can be conveniently measured in a non-split manner, thereby improving the measurement efficiency.

[0004] However, the measuring device needs to be hand-held for operation, and the measurement and reading of numerical values ​​may be subject to human errors due to hand shaking. In addition, since it is a manual operation, there is a risk of deviation in the position where the left and right positioning rods abut against the inner wall of the ball nut, thereby affecting the accuracy of the measurement. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art, the present invention provides a stabilizing device for an internal thread measuring instrument and a verification measurement method thereof. There is no need to hold the housing for measurement operations, thereby preventing measurement errors caused by human factors. The abutment positions of the fixed measuring rod, the movable measuring rod and the inner wall of the ball nut will not shift, thereby ensuring the reliability of the measurement. The fixed measuring rod, the movable measuring rod and the inner wall of the ball nut are abutted at different positions, which facilitates multiple verification measurements and further improves the accuracy of the measurement.

[0006] An internal thread measuring instrument stabilizing device, comprising a housing, wherein a fixed measuring rod and a display instrument are installed on the housing, the fixed measuring rod is fixedly connected to the display instrument, a movable measuring rod is slidably connected to the fixed measuring rod, the display instrument is provided with an arc-shaped channel for the movement of the movable measuring rod, a precision rack is installed at the top end of the movable measuring rod, the precision rack meshes with a precision gear, the precision gear is rotatably sleeved on the central axis of the display instrument, and a pointer is fixedly connected through the scale disk of the display instrument at the center of the precision gear;

[0007] The housing is slidably connected with an upper counterweight base, the upper counterweight base is provided with a notch for a ball nut to enter and a horizontal through-channel for the fixed measuring rod and the movable measuring rod to move, the upper counterweight base is installed with a left horizontal electric telescopic arm and a right horizontal electric telescopic arm, the left horizontal electric telescopic arm is fixedly connected to the fixed measuring rod, and the right horizontal electric telescopic arm is fixedly connected to the movable measuring rod;

[0008] The upper counterweight base is rotatably sleeved with a lower counterweight base, the lower counterweight base is installed with a central vertical electric telescopic arm and a connecting shaft, the central vertical electric telescopic arm is fixedly connected with symmetric rack arms, the racks of the rack arms are all meshed with branch gears, the branch gears are rotatably sleeved on the connecting shaft, the branch gears are fixedly connected with clamping arms, and a measuring base is slidably connected above the central vertical electric telescopic arm of the lower counterweight base. In the top view direction, the connecting line between the fixed measuring rod and the movable measuring rod coincides with the diameter of the measuring base;

[0009] The central vertical electric telescopic arm extends upward, simultaneously moving the measuring base upward and clamping the ball nut located at the center position of the measuring base by the clamping arms.

[0010] Further, the lower counterweight base includes an intermediate cavity and an outer ring cavity, the measuring base is slidably connected with the intermediate cavity, the intermediate cavity is provided with a vertical through-channel for the rack arms to move, and the rack arms are slidably connected with the inner side wall of the outer ring cavity.

[0011] Further, a transparent protection plate is rotatably connected to the top end of the notch, and an annular groove is provided at the top end of the upper counterweight base, and an instrument protection cover is movably connected to the annular groove.

[0012] Further, the upper counterweight base is provided with a socket inner groove, a bearing is installed in the socket inner groove, and the lower counterweight base abuts against the bearing through a socket convex ring.

[0013] Further, the display instrument is fixedly connected with a stabilizing block, and the stabilizing block is slidably abutted against the outer wall of the horizontal through-channel.

[0014] Further, the upper counterweight base is provided with side limit blocks, and the side limit blocks are rotatably connected with measuring rod protection arms. The other ends of the measuring rod protection arms are provided with cleaning and protection cavities for wrapping and fixing the measuring rod and the bottom end of the movable measuring rod.

[0015] Further, the side limit blocks are provided with bottom limit plates, and the measuring rod protection arms in the horizontal state are in contact with the bottom limit plates.

[0016] Further, the outer wall of the upper counterweight base is provided with a handle.

[0017] Further, the outer wall of the lower counterweight base is provided with indicating lines, and the outer wall of the upper counterweight base is provided with scale lines for indicating the rotation angle of the upper counterweight base.

[0018] The recheck measurement method of the above internal thread measuring instrument stabilizing device includes the following steps:

[0019] S1: Place the ball nut on the measuring base, the central vertical electric telescopic arm extends upward, the measuring base and the rack arm move upward, and the branch gear rotates until the clamping arm abuts against the outer wall of the ball nut, and the clamping arm clamps the ball nut at the central position of the measuring base;

[0020] S2: The left horizontal electric telescopic arm contracts, the fixed measuring rod and the display instrument slide, the fixed measuring rod abuts against the inner wall of the ball nut, the right horizontal electric telescopic arm contracts, the movable measuring rod slides in a direction away from the fixed measuring rod until the movable measuring rod abuts against the inner wall of the ball nut, and the scale indicated by the pointer is obtained;

[0021] S3: The left horizontal electric telescopic arm and the right horizontal electric telescopic arm extend, the fixed measuring rod and the movable measuring rod are separated from the inner wall of the ball nut respectively, after rotating the upper counterweight base, repeat the operation step S2;

[0022] S4: Repeat step S3 multiple times to complete the recheck measurement; the principle of the recheck measurement is: the ball nut is clamped at the central position of the measuring base, and no matter how many angles the upper counterweight base rotates, the connecting line between the fixed measuring rod and the movable measuring rod in the top view direction coincides with the diameter of the measuring base.

[0023] Due to the adoption of the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0024] 1) The upper counterweight base and the lower counterweight base of the present invention increase the stability of the housing measurement. The left horizontal electric telescopic arm and the right horizontal electric telescopic arm extend and contract stably, and the fixed measuring rod and the movable measuring rod move stably and synchronously. There is no need to hold the housing for measurement operation, preventing measurement errors caused by human factors;

[0025] 2) The central vertical electric telescopic arm extends upward, the measuring base moves upward, and the symmetric clamping arms push the ball nut to the center position of the measuring base and clamp it. During measurement, the contact positions of the fixed measuring rod, the movable measuring rod and the inner side wall of the ball nut will not shift, ensuring the reliability of measurement;

[0026] 3) When the central vertical electric telescopic arm is not extended, there is a space above the measuring base for placing the ball nut. After the central vertical electric telescopic arm extends upward, it can not only clamp and fix the ball nut through the clamping arms, but also move the ball nut upward to the working space of the fixed measuring rod and the movable measuring rod;

[0027] 4) Rotate the upper counterweight base, and the housing can be stably rotated. The fixed measuring rod and the movable measuring rod contact different positions on the inner side wall of the ball nut, facilitating multiple recheck measurements and further improving the measurement accuracy.

[0028] 5) Through the meshing of the precision rack and the precision gear, when the left horizontal electric telescopic arm and the right horizontal electric telescopic arm are in the initial state, the pointer of the display instrument points to 0, and the measurement reading of the display instrument can be quickly and conveniently obtained for calculating the pitch diameter of the ball nut. When the left horizontal electric telescopic arm and the right horizontal electric telescopic arm return to the initial state, the display instrument is zeroed synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is a sectional view of the present invention;

[0031] Figure 3 is a schematic diagram of the structure where the clamping arms clamp the ball nut;

[0032] Figure 4 is a top view of the lower counterweight base;

[0033] Figure 5 is a side view of the movable measuring rod;

[0034] Figure 6 is a schematic diagram of the relative position between the connecting line between the fixed measuring rod and the movable measuring rod and the measuring base;

[0035] Figure 7 is a schematic diagram of the relative position between the connecting line between the fixed measuring rod and the movable measuring rod and the measuring base after the upper counterweight base rotates 45°;

[0036] Figure 8 is a schematic diagram of the structure of the upper counterweight base;

[0037] Reference numerals: 1 - fixed measuring rod, 2 - display instrument, 3 - movable measuring rod, 4 - precision rack, 5 - precision gear, 6 - pointer, 7 - upper counterweight base, 8 - notch, 9 - horizontal through-channel, 10 - left horizontal electric telescopic arm, 11 - right horizontal electric telescopic arm, 12 - lower counterweight base, 13 - central vertical electric telescopic arm, 14 - connecting shaft, 15 - rack arm, 16 - branch gear, 17 - clamping arm, 18 - measuring base, 19 - intermediate cavity, 20 - outer ring cavity, 21 - vertical through-channel, 22 - annular groove, 23 - instrument protective cover, 24 - bearing, 25 - stabilizing block, 26 - side limit block, 27 - measuring rod protective arm, 28 - bottom limit plate, 29 - handle, 30 - indicating line, 31 - scale line. Detailed implementation

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other implementation manners or equivalent replacements obtained by those skilled in the art without creative efforts are within the protection scope of the present invention.

[0039] The embodiment of the present invention provides a stable device for an internal thread measuring instrument, which solves the technical problem of inaccurate measurement results caused by hand jitter and offset of the contact position of the positioning structure during the measurement of the pitch diameter of a ball nut.

[0040] The technical solution in the embodiment of the present invention to solve the above technical problems has the following general idea: The central vertical electric telescopic arm 13 extends upward, and each rack arm 15 drives the corresponding branch gear 16 to rotate, so that the ball nut is clamped by the clamping arm 17 at the center position of the measuring base 18, and at the same time, the ball nut is moved upward into the operating space of the fixed measuring rod 1 and the movable measuring rod 3; The left horizontal electric telescopic arm 10 is fixedly connected to the fixed measuring rod 1, and the right horizontal electric telescopic arm 11 is fixedly connected to the movable measuring rod 3. The change in the indication of the pointer 6 is adapted to the moving distance of the movable measuring rod 3 relative to the fixed measuring rod 1. When the left horizontal electric telescopic arm 10 drives the fixed measuring rod 1 to move, the right horizontal electric telescopic arm 11 drives the movable measuring rod 3 to move synchronously, so that the position change of the display instrument 2 and the indication reading of the pointer 6 remain unchanged, which is used to determine the position of the fixed measuring rod 1 first during measurement; The fixed measuring rod 1 does not move, and the right horizontal electric telescopic arm 11 drives the movable measuring rod 3 to move relative to the fixed measuring rod 1, so that the position of the display instrument 2 remains unchanged and the indication reading of the pointer 6 changes accordingly, thereby obtaining the pitch diameter data of the ball nut; The principle of the recheck measurement is: The ball nut is clamped at the center position of the measuring base 18. Looking down, the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 coincides with the diameter of the measuring base 18. The contact positions of the fixed measuring rod 1 and the movable measuring rod 3 with the inner side wall of the ball nut do not deviate, and no matter how many angles the upper counterweight base 7 rotates, looking down, the diameter of the imaginary cylinder coaxial with the spiral raceway of the ball nut coincides with the connecting line between the fixed measuring rod 1 and the movable measuring rod 3.

[0041] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0042] Embodiment 1: Please refer to Figures 1 to 5 , the present invention provides a stability device for an internal thread measuring instrument, including a housing. The housing is provided with a fixed measuring rod 1 and a display instrument 2. The fixed measuring rod 1 is fixedly connected to the display instrument 2. The fixed measuring rod 1 is slidably connected with a movable measuring rod 3. The display instrument 2 is provided with an arc-shaped channel for the movable measuring rod 3 to move. A precision rack 4 is installed at the top of the movable measuring rod 3. The precision rack 4 meshes with a precision gear 5. The precision gear 5 is rotatably sleeved on the central axis of the display instrument 2. The center of the precision gear 5 penetrates through the scale disk of the display instrument 2 and is fixedly connected with a pointer 6. The upper positions of the fixed measuring rod 1 and the movable measuring rod 3, the precision gear 5 and the precision rack 4 are all hidden behind the scale disk of the display instrument 2, and only the pointer 6 is in front of the scale disk of the display instrument 2; The movable measuring rod 3 slides, the precision rack 4 moves synchronously, drives the precision gear 5 to rotate synchronously, and the pointer 6 rotates synchronously with the precision gear 5 to obtain the indication reading after the pointer 6 stops stably;

[0043] The housing is slidably connected to an upper counterweight base 7. The upper counterweight base 7 is provided with a notch 8 for the ball nut to enter and a horizontal through-channel 9 for the fixed measuring rod 1 and the movable measuring rod 3 to move. The upper counterweight base 7 is installed with a left horizontal electric telescopic arm 10 and a right horizontal electric telescopic arm 11. The left horizontal electric telescopic arm 10 is fixedly connected to the fixed measuring rod 1, and the right horizontal electric telescopic arm 11 is fixedly connected to the movable measuring rod 3. When the left horizontal electric telescopic arm 10 drives the fixed measuring rod 1 to move, if the right horizontal electric telescopic arm 11 drives the movable measuring rod 3 to move synchronously, the position of the display instrument 2 changes, and the indicated reading of the pointer 6 remains unchanged. When the fixed measuring rod 1 does not move and the movable measuring rod 3 moves relative to the fixed measuring rod 1, the position of the display instrument 2 remains unchanged, and the indicated reading of the pointer 6 changes accordingly.

[0044] That is, when the left horizontal electric telescopic arm 10 is in the initial state, the pointer 6 of the display instrument 2 points to 0. a) The left horizontal electric telescopic arm 10 contracts until the fixed measuring rod 1 abuts against the inner wall of the ball nut, and the right horizontal electric telescopic arm 11 extends the same distance. The pointer 6 of the display instrument 2 still points to 0. Then the right horizontal electric telescopic arm 11 contracts to the right until the movable measuring rod 3 abuts against the inner wall of the ball nut, and the indicated reading T of the pointer 6 is obtained. 1 ; b) The left horizontal electric telescopic arm 10 contracts until the fixed measuring rod 1 abuts against the inner wall of the ball nut, and the right horizontal electric telescopic arm 11 does not move. The pointer 6 of the display instrument 2 points to the corresponding scale T. 0 Then the right horizontal electric telescopic arm 11 directly contracts until the movable measuring rod 3 abuts against the inner wall of the ball nut, and the indicated reading of the pointer 6 is also T. 1 ;

[0045] The upper counterweight base 7 is rotatably sleeved with a lower counterweight base 12. The lower counterweight base 12 is installed with a central vertical electric telescopic arm 13 and a connecting shaft 14. The central vertical electric telescopic arm 13 is fixedly connected with 3 or 4 symmetric rack arms 15. The racks of the rack arms 15 are all engaged with branch gears 16. The branch gears 16 are rotatably sleeved with the connecting shaft 14. The branch gears 16 are fixedly connected with clamping arms 17. The lower counterweight base 12 is slidably connected with a measuring base 18 above the central vertical electric telescopic arm 13. In the top view direction, the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 coincides with the diameter of the measuring base 18. When the central vertical electric telescopic arm 13 extends upward, the measuring base 18 moves upward, and the ball nut moves upward to the working space of the fixed measuring rod 1 and the movable measuring rod 3. At the same time, the clamping arms 17 push the ball nut to the center position of the measuring base 18 and clamp it.

[0046] The upper counterweight base 7 and the lower counterweight base 12 keep the whole device in a stable state. During measurement, the left horizontal electric telescopic arm 10 and the right horizontal electric telescopic arm 11 extend and contract stably, and the fixed measuring rod 1 and the movable measuring rod 3 move stably and synchronously, eliminating the need to hold the housing for measurement operations; the ball nut is clamped at the center position of the measurement base 18. Looking down, the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 coincides with the diameter of the measurement base 18, that is, the diameter of the imaginary cylinder coaxial with the ball nut spiral raceway in the looking-down direction coincides with the connecting line between the fixed measuring rod 1 and the movable measuring rod 3, and the contact positions of the fixed measuring rod 1 and the movable measuring rod 3 with the inner wall of the ball nut do not shift, thus ensuring the accuracy of the measurement results.

[0047] Embodiment 2: Please refer to Figure 1 , Figure 2 and Figure 8 , the lower counterweight base 12 includes an intermediate cavity 19 and an outer ring cavity 20. The measurement base 18 is slidably connected to the intermediate cavity 19. The intermediate cavity 19 is provided with a vertical through-channel 21 for the movement of the rack arm 15. The rack arm 15 is slidably connected to the inner side wall of the outer ring cavity 20, improving the reliability of the up-and-down movement of the rack arm 15; a micro electric telescopic arm can be installed between the measurement base 18 and the central vertical electric telescopic arm 13, capable of finely adjusting the relative height between the ball nut and the fixed measuring rod 1 after the clamping arm 17 clamps the ball nut; the top end of the notch 8 is rotatably connected with a transparent protection plate, and the transparent protection plate is provided with a pull rod to prevent foreign objects from entering the upper counterweight base 7 during the non-use stage; the top end of the upper counterweight base 7 is provided with an annular groove 22, and an instrument protection cover 23 is movably connected to the annular groove 22. The instrument protection cover 23 is inserted into the annular groove 22 to protect the display instrument 2 during the non-use stage; the display instrument 2 is fixedly connected with a stabilizing block 25, and the stabilizing block 25 is slidably abutted against the outer wall of the horizontal through-channel 9, increasing the contact area between the housing and the upper counterweight base 7 and improving the stability of the movement of the housing.

[0048] Embodiment 3: Please refer to Figures 1 to 3, the upper counterweight base 7 is provided with a socket inner groove, and a bearing 24 is installed in the socket inner groove. The lower counterweight base 12 abuts against the bearing 24 through a socket convex ring to improve the smooth rotation of the upper counterweight base 7; the upper counterweight base 7 is provided with a side limit block 26, and a measuring rod protection arm 27 is rotatably connected to the side limit block 26. The measuring rod protection arm 27 is provided with a cleaning protection cavity, and a cleaning cotton is arranged in the cleaning protection cavity. The cleaning cotton has a certain expansibility and can wrap and fix the bottoms of the fixed measuring rod 1 and the movable measuring rod 3 to prevent the fixed measuring rod 1 and the movable measuring rod 3 from adhering to other substances and affecting the measurement accuracy; when the ball nut to be measured is placed on the measuring base 18, the measuring rod protection arm 27 is rotated upward, the cleaning protection cavity is rotated upward, and the bottoms of the fixed measuring rod 1 and the movable measuring rod 3 are unobstructed and will not interfere with the measurement; the side limit block 26 is provided with a bottom limit plate 28, and the horizontally placed measuring rod protection arm 27 abuts against the bottom limit plate 28. The bottom limit plate 28 is used to limit the further downward rotation of the horizontally placed measuring rod protection arm 27. After the internal thread measuring instrument stabilizing device is used up, the ball nut is taken out, and the measuring rod protection arm 27 is rotated downward to the horizontal state, and the cleaning protection cavity wraps and fixes the bottoms of the fixed measuring rod 1 and the movable measuring rod 3 again; the outer wall of the upper counterweight base 7 is provided with handles 29, and the handles 29 are symmetrically arranged in two. Through the handles 29, the upper counterweight base 7 can be rotated conveniently and stably for multiple recheck measurements; the outer wall of the lower counterweight base 12 is provided with an indicating line 30, and the outer wall of the upper counterweight base 7 is provided with a scale line 31 for indicating the rotation angle of the upper counterweight base 7; after the upper counterweight base 7 is rotated, different scale lines 31 are aligned with the indicating line 30, and the rotation angle of the upper counterweight base 7 can be controlled and mastered through the scale line 31 and the indicating line 30.

[0049] Please refer to Figure 2 , Figure 6 and Figure 7 , the recheck measurement method of the above internal thread measuring instrument stabilizing device includes the following steps:

[0050] S1: Initially, the fixed measuring rod 1 and the movable measuring rod 3 are close to each other. The ball nut is placed on the measuring base 18 from the notch 8. The central vertical electric telescopic arm 13 extends upward, and the measuring base 18, the ball nut on the measuring base 18 and the rack arm 15 move upward. The rack arm 15 drives the branch gear 16 to rotate until the clamping arm 17 abuts against the outer wall of the ball nut. At this time, the ball nut is at the center position of the measuring base 18 and is clamped by the clamping arm 17;

[0051] S2: The left horizontal electric telescopic arm 10 contracts, and the fixed measuring rod 1 and the display instrument 2 slide until the fixed measuring rod 1 abuts against the inner wall of the ball nut. The right horizontal electric telescopic arm 11 contracts, and the movable measuring rod 3 slides in a direction away from the fixed measuring rod 1 until the movable measuring rod 3 abuts against the inner wall of the ball nut, and the scale indicated by the pointer 6 is obtained;

[0052] S3: The left horizontal electric telescopic arm 10 and the right horizontal electric telescopic arm 11 extend, the fixed measuring rod 1 and the movable measuring rod 3 are separated from the inner side wall of the ball nut and approach each other respectively, the position of the lower counterweight base 12 remains unchanged, after the upper counterweight base 7 rotates a certain angle, repeat the operation step S2, that is, the left horizontal electric telescopic arm 10 contracts until the fixed measuring rod 1 abuts against the inner side wall of the ball nut, and the right horizontal electric telescopic arm 11 contracts until the movable measuring rod 3 abuts against the inner side wall of the ball nut;

[0053] S4: Repeat step S3 multiple times, compare whether the indicated scales of the pointer 6 are consistent, complete the review measurement, and use the indicated scale of the pointer 6 to calculate the pitch diameter of the ball nut;

[0054] The principle of the review measurement is as follows: The ball nut is clamped at the center position of the measurement base 18. Looking down, the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 coincides with the diameter of the measurement base 18, that is, the diameter of the imaginary cylinder coaxial with the ball nut spiral raceway in the looking-down direction coincides with the connecting line between the fixed measuring rod 1 and the movable measuring rod 3. The abutting positions of the fixed measuring rod 1 and the movable measuring rod 3 against the inner side wall of the ball nut do not shift, and the measurement results are accurate and reliable; No matter how many angles the upper counterweight base 7 rotates, looking down, the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 coincides with the corresponding diameter of the measurement base 18, and the diameter of the imaginary cylinder coaxial with the ball nut spiral raceway coincides with the connecting line between the fixed measuring rod 1 and the movable measuring rod 3, and the measurement results are repeatedly verified.

[0055] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor limit the present invention to only the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical fields can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A stabilizing device for an internal thread measuring instrument, comprising a housing, characterized in that: The housing is provided with a fixed measuring rod (1) and a display instrument (2), the fixed measuring rod (1) is fixedly connected to the display instrument (2), the fixed measuring rod (1) is slidably connected to a movable measuring rod (3), the housing is slidably connected to an upper counterweight base (7), the upper counterweight base (7) is rotatably sleeved with a lower counterweight base (12), the lower counterweight base (12) is provided with a central vertical electric telescopic arm (13), the central vertical electric telescopic arm (13) is fixedly connected to a symmetrical rack arm (15), the racks of the rack arm (15) are all meshed with branch gears (16), the branch gears (16) are fixedly connected to a clamping arm (17), the lower counterweight base (12) is slidably connected to a measuring base (18) above the central vertical electric telescopic arm (13), the ball nut is clamped by the clamping arm (17) at the center position of the measuring base (18), and the connecting line between the fixed measuring rod (1) and the movable measuring rod (3) in the top view coincides with the diameter of the measuring base (18); The display instrument (2) is provided with an arc-shaped channel for the movable measuring rod (3) to move, a precision rack (4) is installed on the top end of the movable measuring rod (3), the precision rack (4) is meshed with a precision gear (5), the precision gear (5) is rotatably sleeved with the central axis of the display instrument (2), and the center of the precision gear (5) passes through the scale plate of the display instrument (2) and is fixedly connected with a pointer (6); The upper counterweight base (7) is provided with a notch (8) for the ball nut to enter and a horizontal through channel (9) for the fixed measuring rod (1) and the movable measuring rod (3) to move. The upper counterweight base (7) is equipped with a left horizontal electric telescopic arm (10) and a right horizontal electric telescopic arm (11). The left horizontal electric telescopic arm (10) is fixedly connected to the fixed measuring rod (1), and the right horizontal electric telescopic arm (11) is fixedly connected to the movable measuring rod (3). The lower counterweight base (12) is provided with a connecting shaft (14), the branch gear (16) is rotatably sleeved with the connecting shaft (14), the lower counterweight base (12) comprises an intermediate cavity (19) and an outer ring cavity (20), the measuring base (18) is slidably connected with the intermediate cavity (19), the intermediate cavity (19) is provided with a vertical through passage (21) for the rack arm (15) to move, and the rack arm (15) is slidably connected with the inner side wall of the outer ring cavity (20); The central vertical electric telescopic arm (13) extends upward, the measuring base (18) moves upward, the clamping arm (17) clamps the ball nut, the left horizontal electric telescopic arm (10) contracts until the fixed measuring rod (1) abuts against the inner wall of the ball nut, and the right horizontal electric telescopic arm (11) contracts until the movable measuring rod (3) abuts against the inner wall of the ball nut, and the diameter of an imaginary cylinder coaxial with the spiral raceway of the ball nut in a top view coincides with the connecting line between the fixed measuring rod (1) and the movable measuring rod (3).

2. The internal thread measuring instrument stabilizing device according to claim 1, characterized in that: The top of the notch (8) is rotatably connected to a transparent protective plate, the top of the upper counterweight base (7) is provided with an annular groove (22), and the annular groove (22) is movably connected to an instrument protection cover (23).

3. The internal thread measuring instrument stabilizing device according to claim 1, characterized in that: The upper counterweight base (7) is provided with a sleeve inner groove, a bearing (24) is installed in the sleeve inner groove, and the lower counterweight base (12) is in contact with the bearing (24) via a sleeve convex ring.

4. The internal thread measuring instrument stabilizing device according to claim 1, characterized in that: The display instrument (2) is fixedly connected to a stabilizing block (25), and the stabilizing block (25) is in sliding contact with the outer wall of the horizontal through-channel (9).

5. The internal thread measuring instrument stabilizing device according to claim 1, characterized in that: The upper counterweight base (7) is provided with a side limit block (26), and the side limit block (26) is rotatably connected to a measuring rod protection arm (27), and the other end of the measuring rod protection arm (27) is provided with a cleaning protection cavity for wrapping the bottom ends of the fixed measuring rod (1) and the movable measuring rod (3).

6. The internal thread measuring instrument stabilizing device according to claim 5, characterized in that: The side limit block (26) is provided with a bottom limit plate (28), and the measuring rod protection arm (27) in a horizontal state abuts against the bottom limit plate (28).

7. The internal thread measuring instrument stabilizing device according to claim 1, characterized in that: The outer wall of the upper counterweight base (7) is provided with a handle (29).

8. The internal thread measuring instrument stabilizing device according to claim 1, characterized in that: The outer wall of the lower counterweight base (12) is provided with an indication line (30), and the outer wall of the upper counterweight base (7) is provided with a scale line (31) for indicating the rotation angle of the upper counterweight base (7).

9. The verification measurement method of the internal thread measuring instrument stabilization device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The ball nut is placed on the measuring base (18), the central vertical electric telescopic arm (13) is extended upward, the measuring base (18) and the rack arm (15) are moved upward, the branch gear (16) is rotated until the clamping arm (17) abuts against the outer wall of the ball nut, and the clamping arm (17) pushes the ball nut to the center position of the measuring base (18) and clamps it; S2: the fixed measuring rod (1) slides to the left, the display instrument (2) moves synchronously, the fixed measuring rod (1) abuts against the inner side wall of the ball nut, and the movable measuring rod (3) slides in a direction away from the fixed measuring rod (1) until the movable measuring rod (3) abuts against the inner side wall of the other side of the ball nut, thereby obtaining the indication scale of the display instrument (2); S3: the fixed measuring rod (1) slides to the right and the movable measuring rod (3) slides to the left, the fixed measuring rod (1) and the movable measuring rod (3) are separated from the inner wall of the ball nut respectively, and the upper counterweight base (7) is rotated, and the operation step S2 is repeated; S4: Repeat step S3 multiple times to compare whether the indication scales of the display instrument (2) are consistent, and complete the verification measurement.

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