Internal thread measuring instrument stabilizing device and re-checking measuring method thereof

Abstract

The invention relates to the technical field of internal thread pitch diameter measurement, in particular to an internal thread measuring instrument stabilizing device and a rechecking measurement method thereof.The device comprises a shell, a fixed measuring rod and a display instrument are installed on the shell, the fixed measuring rod is slidably connected with a movable measuring rod, and the movable measuring rod is meshed with a precision gear through a precision rack; the precision gear is fixedly connected with a pointer; the shell is slidably connected with an upper counterweight base, the left horizontal electric telescopic arm is fixedly connected with the fixed measuring rod, and the right horizontal electric telescopic arm is fixedly connected with the movable measuring rod; the upper counterweight base is rotationally sleeved with a lower counterweight base, the lower counterweight base is provided with a central vertical electric telescopic arm and a connecting shaft, and the central vertical electric telescopic arm is meshed with a branch gear through a rack arm; according to the method, after the ball nut is clamped in the center of the measuring base and the upper counterweight base is rotated, the connecting line between the fixed measuring rod and the movable measuring rod in the overlook direction coincides with the diameter of the measuring base, manual errors and offset are prevented, and the measuring accuracy is improved.

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] A stabilizing device for an internal thread measuring instrument comprises a housing, a fixed measuring rod and a display instrument are installed on the housing, the fixed measuring rod is fixedly connected to the display instrument, the fixed measuring rod is slidably connected to a movable measuring rod, the display instrument is provided with an arc-shaped channel for the movable measuring rod to move, a precision rack is installed on the top of the movable measuring rod, the precision rack is meshed with a precision gear, the precision gear is rotatably sleeved with the central axis of the display instrument, and the center of the precision gear passes through the dial of the display instrument and is fixedly connected with a pointer; The shell is slidably connected to 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 a fixed measuring rod and a 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; The upper counterweight base is rotatably sleeved with the 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 a symmetrical rack arm, the racks of the rack arm are meshed with branch gears, the branch gears are rotatably sleeved with the connecting shaft, the branch gears are fixedly connected with a clamping arm, the lower counterweight base is slidably connected with a measuring base above the central vertical electric telescopic arm, and 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; The central vertical electric telescopic arm extends upward, simultaneously causing the measuring base to move upward and the clamping arm to clamp the ball nut located at the center of the measuring base.

[0007] Furthermore, the lower counterweight base includes an intermediate cavity and an outer ring cavity, the measuring base is slidably connected to the intermediate cavity, the intermediate cavity is provided with a vertical through channel for the rack arm to move, and the rack arm is slidably connected to the inner side wall of the outer ring cavity.

[0008] Furthermore, a transparent protective plate is rotatably connected to the top of the notch, an annular groove is provided on the top of the upper counterweight base, and an instrument protection cover is movably connected to the annular groove.

[0009] Furthermore, the upper counterweight base is provided with a sleeve inner groove, a bearing is installed in the sleeve inner groove, and the lower counterweight base is in contact with the bearing via a sleeve convex ring.

[0010] Furthermore, the display instrument is fixedly connected with a stabilizing block, and the stabilizing block is slidably abutted against an outer wall of the horizontal through-channel.

[0011] Furthermore, the upper counterweight base is provided with a side limit block, and the side limit block is rotatably connected to a measuring rod protection arm. The other end of the measuring rod protection arm is provided with a cleaning protection cavity for wrapping the bottom end of the fixed measuring rod and the movable measuring rod.

[0012] Furthermore, the side limit block is provided with a bottom limit plate, and the measuring rod protection arm in a horizontal state abuts against the bottom limit plate.

[0013] Furthermore, a handle is provided on the outer wall of the upper counterweight base.

[0014] Furthermore, an outer wall of the lower counterweight base is provided with an indicator line, and an outer wall of the upper counterweight base is provided with a scale line for indicating the rotation angle of the upper counterweight base.

[0015] The verification measurement method of the above-mentioned internal thread measuring instrument stabilization device comprises the following steps: S1: The ball nut is placed on the measuring base, the central vertical electric telescopic arm extends upward, the measuring base and the rack arm move upward, 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 center of the measuring base; S2: The left horizontal electric telescopic arm is retracted, 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 is retracted, and the movable measuring rod slides 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; S3: The left horizontal electric telescopic arm and the right horizontal electric telescopic arm are extended, the fixed measuring rod and the movable measuring rod are separated from the inner wall of the ball nut respectively, and after the upper counterweight base is rotated, the operation step S2 is repeated; S4: Repeat step S3 several times to complete the recheck measurement. The principle of the recheck measurement is that the ball nut is clamped at the center of the measuring base, and no matter how much the upper counterweight base rotates, the connecting line between the fixed measuring rod and the movable measuring rod in the top view coincides with the diameter of the measuring base.

[0016] Due to the adoption of the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: 1) The upper counterweight base and the lower counterweight base of the present invention increase the stability of the shell measurement, the left horizontal electric telescopic arm and the right horizontal electric telescopic arm stably extend and retract, the fixed measuring rod and the movable measuring rod stably move synchronously, and there is no need to hold the shell for measurement operation, thereby preventing measurement errors caused by human factors; 2) The central vertical electric telescopic arm extends upward, the measuring base moves upward, and the symmetrical clamping arm pushes the ball nut to the center of the measuring base and clamps it. During measurement, the abutment position of the fixed measuring rod, the movable measuring rod and the inner wall of the ball nut will not shift, ensuring the reliability of the measurement; 3) When the central vertical electric telescopic arm is not extended, there is space above the measuring base for placing the ball nut. After the central vertical electric telescopic arm is extended upward, it can not only clamp and fix the ball nut through the clamping arm, but also move the ball nut upward to the working space of the fixed measuring rod and the movable measuring rod; 4) By rotating the upper counterweight base, the housing can be stably rotated, and the fixed measuring rod, movable measuring rod and the inner wall of the ball nut can be abutted at different positions, which is convenient for multiple verification measurements and further improves the accuracy of the measurement.

[0017] 5) Through the meshing action of the precision rack and the precision gear, the pointer of the display instrument points to 0 when the left horizontal electric telescopic arm and the right horizontal electric telescopic arm are set to the initial state, so that the measurement reading of the display instrument can be obtained quickly and conveniently for calculating the middle diameter of the ball nut. The left horizontal electric telescopic arm and the right horizontal electric telescopic arm are restored to the initial state, that is, the display instrument is calibrated to zero synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the structure of the clamping arm clamping the ball nut; Figure 4 It is a top view of the lower counterweight base; Figure 5 It is a side view of the movable measuring rod; Figure 6 A structural schematic diagram of the relative positions of the connecting line between the fixed measuring rod and the movable measuring rod and the measuring base; Figure 7 It is a structural schematic diagram of the relative positions of the connection line between the fixed measuring rod and the movable measuring rod and the measuring base after the upper counterweight base is rotated 45 degrees; Figure 8 It is a structural schematic diagram of the upper counterweight base; Figure markings, 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-center vertical electric telescopic arm, 14-connecting shaft, 15-rack arm, 16-branch gear, 17-clamping arm, 18-measuring base, 19-middle cavity, 20-outer ring cavity, 21-vertical through channel, 22-annular groove, 23-instrument protection cover, 24-bearing, 25-stabilizing block, 26-side limit block, 27-measuring rod protection arm, 28-bottom limit plate, 29-handle, 30-indicator line, 31-scale line. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other implementation methods or equivalent replacements obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0020] The embodiment of the present invention solves the technical problem of inaccurate measurement results caused by hand-held shaking and abutment position deviation of the positioning structure during the measurement of the ball nut diameter by providing a stabilizing device for an internal thread measuring instrument.

[0021] The technical solution in the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows: 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 located at the center position of the measuring base 18 and is clamped by the clamping arm 17, and the ball nut moves upward to 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 of the scale indicated by 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, and the position change of the display instrument 2 and the pointer 6 remains unchanged, and the position of the fixed measuring rod 1 is determined first when it is used for 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, then the position of the display instrument 2 remains unchanged, and the indication reading of the pointer 6 changes accordingly, thereby obtaining the ball nut mean diameter data; the principle of the recheck measurement is: the ball nut is clamped at the center position of the measuring base 18, the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 in the overhead direction coincides with the diameter of the measuring base 18, the abutment position of the fixed measuring rod 1, the movable measuring rod 3 and the inner wall of the ball nut does not shift, and no matter how much the upper counterweight base 7 rotates, the diameter of the imaginary cylinder coaxial with the spiral raceway of the ball nut in the overhead direction coincides with the connecting line between the fixed measuring rod 1 and the movable measuring rod 3.

[0022] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Example 1: Please refer to Figures 1 to 5The present invention provides a stabilizing device for an internal thread measuring instrument, comprising a shell, a fixed measuring rod 1 and a display instrument 2 are installed on the shell, the fixed measuring rod 1 is fixedly connected to the display instrument 2, a movable measuring rod 3 is slidably connected to the fixed measuring rod 1, 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 of the movable measuring rod 3, a 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, the center of the precision gear 5 passes through the dial 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 dial of the display instrument 2, and only the pointer 6 is in front of the dial 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 following the precision gear 5, and obtains the indication reading after the pointer 6 is stable and motionless; The housing is slidably connected with an upper counterweight base 7, which 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 indication reading of the pointer 6 remains unchanged; if 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 indication reading of the pointer 6 changes accordingly; 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 is retracted until the fixed measuring rod 1 abuts against the inner wall of the ball nut, the right horizontal electric telescopic arm 11 extends the same distance, the pointer 6 of the display instrument 2 continues to point to 0, the right horizontal electric telescopic arm 11 is retracted to the right until the movable measuring rod 3 abuts against the inner wall of the ball nut, and the indication reading of the pointer 6 is T1; b) the left horizontal electric telescopic arm 10 is retracted until the fixed measuring rod 1 abuts against the inner wall of the ball nut, the right horizontal electric telescopic arm 11 does not move, the pointer 6 of the display instrument 2 points to the corresponding scale T0, the right horizontal electric telescopic arm 11 is directly retracted until the movable measuring rod 3 abuts against the inner wall of the ball nut, and the indication reading of the pointer 6 is also T1; The upper counterweight base 7 is rotatably sleeved with the lower counterweight base 12, and 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 symmetrical rack arms 15, and the racks of the rack arms 15 are all meshed with branch gears 16, and the branch gears 16 are rotatably sleeved with the connecting shaft 14, and the branch gears 16 are fixedly connected with a clamping arm 17. The lower counterweight base 12 is slidably connected with a measuring base 18 above the central vertical electric telescopic arm 13, 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 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, and at the same time the clamping arm 17 pushes the ball nut to the center position of the measuring base 18 and clamps it; The upper counterweight base 7 and the lower counterweight base 12 keep the entire device in a stable state. During measurement, the left horizontal electric telescopic arm 10 and the right horizontal electric telescopic arm 11 are stably extended and retracted, and the fixed measuring rod 1 and the movable measuring rod 3 are stably moved synchronously, and there is no need to hold the shell for measurement operations; the ball nut is clamped 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, that is, the diameter of an imaginary cylinder coaxial with the spiral raceway of the ball nut in the top view coincides with the connecting line between the fixed measuring rod 1 and the movable measuring rod 3, and the abutment position of the fixed measuring rod 1 and the movable measuring rod 3 with the inner wall of the ball nut does not shift, thereby ensuring the accuracy of the measurement results.

[0024] Example 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 measuring base 18 is slidably connected to the intermediate cavity 19. The intermediate cavity 19 is provided with a vertical through channel 21 for the rack arm 15 to move. The rack arm 15 is slidably connected to the inner side wall of the outer ring cavity 20 to improve the reliability of the up and down movement of the rack arm 15. A micro electric telescopic arm can be installed between the measuring base 18 and the central vertical electric telescopic arm 13, and the relative height of the ball nut and the fixed measuring rod 1 can be finely adjusted after the clamping arm 17 clamps the ball nut. The top of the opening 8 is rotatably connected to a transparent protective plate, which is provided with a pull rod to prevent foreign matter from entering the upper counterweight base 7 when not in use; 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, which is plugged into the annular groove 22 to protect the display instrument 2 when not in use; the display instrument 2 is fixedly connected to a stabilizing block 25, which is in sliding contact with the outer wall of the horizontal through channel 9, thereby increasing the contact area between the shell and the upper counterweight base 7 and improving the stability of the shell movement.

[0025] Example 3: Please refer to Figures 1 to 3The upper counterweight base 7 is provided with a sleeve inner groove, and a bearing 24 is installed in the sleeve inner groove. The lower counterweight base 12 abuts against the bearing 24 through a sleeve convex ring to improve the smoothness of the rotation of the upper counterweight base 7; 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 measuring rod protection arm 27 is provided with a cleaning protection cavity, and a cleaning cotton is provided in the cleaning protection cavity. The cleaning cotton has a certain expansibility and can wrap the bottom ends 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 accuracy of the measurement; 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 bottom ends of the fixed measuring rod 1 and the movable measuring rod 3 are unobstructed, which will not hinder the measurement; the side limit block 26 is provided with a bottom limit plate 28, and the measuring rod protection arm in the horizontal state 27 is in contact with the bottom limit plate 28, and the bottom limit plate 28 is used to limit the horizontal measuring rod protection arm 27 from continuing to rotate downward. After the use of the internal thread measuring instrument stabilizing device is completed, the ball nut is taken out, the measuring rod protection arm 27 is rotated downward to the horizontal state, and the cleaning protection cavity is re-wrapped with the bottom ends of the fixed measuring rod 1 and the movable measuring rod 3; the outer wall of the upper counterweight base 7 is provided with a handle 29, and the handle 29 is symmetrically arranged. The upper counterweight base 7 can be rotated conveniently and stably by the handle 29 to perform multiple verification measurements; the outer wall of the lower counterweight base 12 is provided with an indicator line 30, and the outer wall of the upper counterweight base 7 is provided with a scale line 31, which is used to indicate the rotation angle of the upper counterweight base 7; after rotating the upper counterweight base 7, different scale lines 31 are aligned with the indicator line 30, and the rotation angle of the upper counterweight base 7 can be controlled by the scale line 31 and the indicator line 30.

[0026] See also Figure 2 , Figure 6 and Figure 7 The verification measurement method of the above-mentioned internal thread measuring instrument stabilization device comprises the following steps: 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 is extended upward, 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 which time the ball nut is at the center of the measuring base 18 and is clamped by the clamping arm 17; S2: The left horizontal electric telescopic arm 10 is retracted, 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 is retracted, and the movable measuring rod 3 slides 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; S3: The left horizontal electric telescopic arm 10 and the right horizontal electric telescopic arm 11 are extended, 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, the position of the lower counterweight base 12 remains unchanged, and after the upper counterweight base 7 rotates a certain angle, the operation step S2 is repeated, that is, the left horizontal electric telescopic arm 10 is retracted until the fixed measuring rod 1 abuts against the inner side wall of the ball nut, and the right horizontal electric telescopic arm 11 is retracted until the movable measuring rod 3 abuts against the inner side wall of the ball nut; S4: Repeat step S3 multiple times to compare whether the indication scale of the pointer 6 is consistent, complete the recheck measurement, and use the indication scale of the pointer 6 to calculate the median diameter 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, and the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 in the downward direction coincides with the diameter of the measuring base 18, that is, the diameter of the imaginary cylinder coaxial with the spiral raceway of the ball nut in the downward direction coincides with the connecting line between the fixed measuring rod 1 and the movable measuring rod 3, the abutment position of the fixed measuring rod 1, the movable measuring rod 3 and the inner wall of the ball nut is not offset, and the measurement result is accurate and reliable; no matter how much the upper counterweight base 7 rotates, the connecting line between the fixed measuring rod 1 and the movable measuring rod 3 in the downward direction coincides with the corresponding diameter of the measuring base 18, and 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, and the measurement result is repeatedly verified.

[0027] 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 do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only 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) being fixedly connected to the display instrument (2), the fixed measuring rod (1) being slidably connected to a movable measuring rod (3), the housing being slidably connected to an upper counterweight base (7), the upper counterweight base (7) being rotatably sleeved with a lower counterweight base (12), the lower counterweight base (12) being provided with a central vertical electric telescopic arm (13), the central vertical electric telescopic arm (13) being fixedly connected to a symmetrical rack arm (15), the racks of the rack arm (15) being meshed with branch gears (16), the branch gears (16) being fixedly connected to a clamping arm (17), the lower counterweight base (12) being slidably connected to a measuring base (18) above the central vertical electric telescopic arm (13), the ball nut being clamped by the clamping arm (17) at the center of the measuring base (18), and the connecting line between the fixed measuring rod (1) and the movable measuring rod (3) in a top view coincides with the diameter of the measuring base (18).

2. The internal thread measuring instrument stabilizing device according to claim 1, characterized in that: 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 mounted 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 to 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 to 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).

3. The internal thread measuring instrument stabilizing device according to claim 2, 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).

4. 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.

5. The internal thread measuring instrument stabilizing device according to claim 2, 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).

6. 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).

7. The internal thread measuring instrument stabilizing device according to claim 6, 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).

8. 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).

9. 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).

10. The verification measurement method of the internal thread measuring instrument stabilization device according to any one of claims 1 to 9, 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.

Images