A cross-section profile drawing instrument for extrusion taps

Abstract

Provided is a cross-sectional profile drawing instrument for extruded taps, including a runout inspection instrument; a tap is coaxially mounted on the runout inspection instrument; a drawing board is coaxially fixedly mounted on the handle of the tap; a drawing paper is provided on the drawing surface of the drawing board; a measuring head is provided to fit the outer contour of the tap; the measuring head is coaxially and detachably mounted on the end of a dial gauge rod, and the measuring head and the dial gauge rod are coaxially and perpendicular to the horizontal axis; the dial gauge is fixedly supported and mounted by a dial gauge bracket; the dial gauge bracket can be horizontally moved and adjusted along the runout inspection instrument; the measuring head is mounted with a drawing pen facing the drawing board, and the tip of the drawing pen fits the surface of the drawing paper, and the drawing pen draws the outer contour of the tap along with the running measuring head. The utility model can accurately, intuitively, at low cost, conveniently and efficiently detect the shape and size of the cross-sectional profile to be detected of the extruded tap, is suitable for popularization, and helps to improve the progress of research and development.

Description

Technical Field

[0001] The utility model belongs to the technical field of physical measurement and testing of irregular surfaces, and in particular relates to an instrument for drawing the cross-section profile of an extrusion tap. Background Art

[0002] In the benchmarking and development process of extrusion taps, it is necessary to accurately obtain the external contour of the end face of the extrusion tap thread. There are currently two ways to obtain the truncation shape. One is the Zhuole Tool Testing Center, which performs scanning and measurement along the axis of the tap thread and generates a three-dimensional model or two-dimensional contour map of the thread line through software to help inspectors understand the thread shape and size. However, the curve obtained by this method is composed of discrete dot matrices and is incomplete (such as Figure 7 The first method is to use a projector to take photos, but the product needs to be cut, polished, and the projector needs to be used to obtain cross-sectional photos. The cycle is long and there are many steps. However, the image boundary obtained is distorted and has defects, which delays the progress of benchmarking research and development. In this regard, in order to achieve accurate, intuitive, low-cost, convenient and efficient detection, the following technical solutions are proposed. Utility Model Content

[0003] The utility model solves the technical problem of providing an extrusion tap cross-section profile drawing instrument to solve the technical problems of high cost, long cycle, inconvenience and distortion defects in the existing extrusion tap profile detection technology.

[0004] The utility model adopts the following technical scheme: a cross-sectional profile drawing instrument for an extruded tap, comprising a run-out inspection instrument; the two end supports of the run-out inspection instrument are coaxially clamped with the tap to be inspected; a drawing board is coaxially fixedly installed on the handle of the tap and the drawing board rotates coaxially with the tap; a drawing surface of the drawing board is provided with drawing paper; a measuring head is provided to fit the cross-sectional profile of the threaded portion of the extruded tap; the measuring head is coaxially and detachably installed on the end of a micrometer measuring rod, and the measuring head and the micrometer measuring rod are coaxially perpendicular to the horizontal axis of the run-out inspection instrument; wherein the micrometer is fixedly supported and installed by a micrometer bracket; the micrometer bracket can be horizontally moved and adjusted along the run-out inspection instrument; the measuring head is provided with a drawing pen facing the drawing board, and the tip of the drawing pen is fitted to the surface of the drawing paper, and the drawing pen draws the cross-sectional profile of the threaded portion of the tap as the measuring head runs.

[0005] Among the above technical solutions, as the preferred technical solution of the utility model: the vibration tester has a base platform; two supports are installed at both ends of the base platform for relative or opposite sliding adaptation; coaxial positioning shafts are respectively provided at the tops of the two supports; the handle drives the positioning shaft to rotate; a micrometer bracket is installed on the base platform; and a micrometer is installed on the micrometer bracket.

[0006] Among the above technical solutions, as the preferred technical solution of the utility model: the drawing plate is composed of a sleeve, an annular plate, and a top screw I; the sleeve and the annular plate are coaxially fixed as one; the sleeve and the tap handle are coaxially adapted and fixedly connected, and the sleeve is locked by a top screw I.

[0007] Among the above technical solutions, as the preferred technical solution of the utility model: the measuring head is a duckbill measuring head, the duckbill span of the duckbill measuring head is at least larger than the two pitches of the tap, and is used to detect the outer circular shape of the threaded part of the tap.

[0008] Among the above technical solutions, as the preferred technical solution of the utility model: a measuring head screw is coaxially formed at the top of the measuring head rod body; the measuring head screw is coaxially fixedly connected to the internal threaded hole formed at the center of the bottom end of the micrometer measuring rod, and the measuring head screw is locked in position by a top screw III.

[0009] Among the above technical solutions, as the preferred technical solution of the utility model: the measuring head rod system is provided with a drawing pen socket with a through-hole structure; the socket is plugged in to fit the drawing pen; a top screw hole is provided perpendicular to the socket; a top screw II is installed in the top screw hole; and top screw II locks the position of the drawing pen.

[0010] In the above technical scheme, as a further improvement of the utility model: the socket is tilted downward, and the angle between the center line of the socket and the horizontal axis is 15°, and the tip of the drawing pen is coplanar with the detection surface of the measuring head and the surface of the tap to be detected, which is used to reflect the contour of the drawing tap in a 1:1 ratio.

[0011] The advantages of this utility model compared with the prior art:

[0012] 1. The utility model is used to realize drawing of the cross section of special-shaped shaft parts, namely, extrusion taps, and provides a function of converting spatial motion into planar motion; it can accurately, intuitively, cheaply, conveniently and efficiently detect the profile size and shape of the cross section to be detected of the extrusion tap, is suitable for popularization, and helps to improve and shorten the research and development progress.

[0013] 2. The measuring head of the utility model can be installed selectively. After the selected measuring head is installed, the rod system of the measuring head is provided with a drawing pen socket. When the socket is tilted downward, especially when the drawing pen tip is coplanar with the detection surface of the measuring head and the surface to be detected of the tap, a 1:1 reflection of the cross-sectional profile of the drawing tap can be achieved, and the detection result is intuitive, accurate, convenient and efficient.

[0014] 3. The utility model has a low production cost and is easy to use. Due to the yield force of the micrometer itself, the runout of the cross section of the extrusion tap can be accurately measured and the shape of the cross section of the extrusion tap can be drawn; therefore, the drawing pen can intuitively draw the shape of the cross section of the extrusion tap on the drawing paper, thereby realizing convenient and intuitive detection of the cross section that meets the design needs.

[0015] 4. The plotter of the utility model has a detachable measuring head, a micrometer, and a plotting pen, so it can be easily installed and disassembled, and is also easy to adjust, thus achieving versatility.

[0016] 5. In practical applications, the utility model selects different measuring heads and micrometers for combination according to different specifications and detection requirements of the extrusion taps to meet various detection needs; and according to the different pitches and profile sizes of the extrusion taps to be detected, the axial position of the micrometer is adjusted by horizontally moving the micrometer bracket and locking it with a fastening bolt, and the utility model has excellent versatility.

[0017] 6. The measuring head of the utility model is fixed to the micrometer rod through a threaded connection, and the position of the measuring head is locked through a top screw III, so as to realize self-locking of the measuring head and avoid shaking or deviation of the measuring head during movement, thereby affecting the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the plotter of the utility model;

[0019] Figure 2 for Figure 1 The center A shows the enlarged detail of the drawing pen tilt adjustment installation;

[0020] Figure 3 It is a front view of the duckbill type measuring head of the present invention;

[0021] Figure 4 For the present invention Figure 3 Side view of the duckbill measuring head;

[0022] Figure 5 Draw the front view of the board for this utility model;

[0023] Figure 6 Drawing board for this utility model Figure 5 Left view of;

[0024] Figure 7 This is the tap cross-section profile diagram obtained by Zhuole Tool Testing Center under the existing technology;

[0025] Figure 8 The tap cross-section profile obtained by the drawing instrument of the utility model;

[0026] Fig. 9 This is an enlarged detail diagram of the drawing detection principle of the drawing instrument of the utility model;

[0027] In the figure: 1-runout inspection instrument, 1-1 support, 1-2 base platform, 1-3 positioning shaft, 1-4 handle; 2-tap, 3-drawing plate, 3-1 sleeve, 3-2 annular plate, 3-3 top screw I; 4-measuring head, 4-1 socket, 4-2 top screw hole, 4-3 measuring head screw; 5-micrometer, 6-micrometer bracket, 7-drawing pen. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] (like Figure 1 As shown in the figure, a cross-section profile drawing instrument for extrusion taps is used. The utility model takes the detection of M10 extrusion taps 2 as an example: it includes a run-out inspection instrument 1; the horizontal coaxial supports 1-1 at both ends of the run-out inspection instrument 1 are coaxially clamped with the tap 2 to be detected.

[0030] In the above-mentioned embodiment, as a preferred embodiment of the utility model: the runout tester 1 has a base platform 1-2; two ends of the base platform 1-2 are respectively slidably adapted to install two supports 1-1 relative to or toward each other, that is, to achieve the clamping of taps 2 of different lengths. The tops of the two supports 1-1 are respectively provided with coaxial positioning shafts 1-3; the positioning shafts 1-3 of the shafts are used to ensure the coaxiality of the taps 2 when clamped and rotated, thereby ensuring the detection accuracy. The handle 1-4 drives the positioning shaft 1-3 to rotate, which is simple to operate and economical and practical. Among them, the positioning shaft 1-3 is preferably installed by a horizontal rotation support of a bearing. The base platform 1-2 is installed with a micrometer bracket 6; the micrometer bracket 6 is installed with a micrometer 5.

[0031] It should be noted that the specific structure of the runout tester 1 and the adjustment principle of the runout tester 1 and the dial gauge bracket 6 can be referred to the specific structure of a gear runout tester with the publication number CN213748168U in the prior art. The difference is that the dial gauge bracket 6 of the utility model is slidably adapted to the base platform 1-2 for adjusting the axial position of the dial gauge bracket 6, and the bottom of the dial gauge bracket 6 is locked by a handle-type fastening bolt to adjust the position of the dial gauge bracket 6.

[0032] The improvement of the utility model is that the tap 2 of the utility model is coaxially fixedly mounted with the tap handle and the drawing board 3 is made to rotate coaxially with the tap 2 so as to draw the contour shape of the tap 2 on the drawing board 3 .

[0033] (like Figure 5, Figure 6 As shown in the above embodiment, as a preferred embodiment of the utility model: the drawing plate 3 is composed of a sleeve 3-1, an annular plate 3-2, and a top screw Ⅰ3-3. The sleeve 3-1 and the annular plate 3-2 are coaxially fixedly connected as a whole; preferably: the sleeve 3-1 and the annular plate 3-2 are integrally formed to ensure the coaxiality of the two. The sleeve 3-1 and the taper shank of the tap 2 are coaxially adapted and fixedly connected, and there is no connection gap to ensure the drawing accuracy after coaxiality. And in order to prevent the drawing plate 3 and the tap 2 from loosening and displacement, the sleeve 3-1 is locked by the top screw Ⅰ3-3; taking the M10 extrusion tap 2 as an example, the top screw Ⅰ3-3 is an M5 top screw.

[0034] More specifically: the size of the drawing board 3 can be larger than the base circle of the tap 2 of the part to be inspected according to actual needs. The drawing surface of the drawing board 3 is provided with a special detachable drawing paper. The drawing paper is pasted on the front of the drawing board 3, and the firmness of the bonding needs to effectively avoid the displacement of the drawing paper. In addition, the drawing paper can be made of a rigid material such as plastic, and the material adapted to the drawing pen 7 is preferably a rigid metal material, so as to avoid the influence of drawing accuracy caused by the wear of the pencil tip. When drawing with a drawing pen 7 made of a rigid metal material such as stainless steel, there is no wear problem, and the contour of the tap 2 can be drawn by engraving marks on the plastic drawing paper to ensure drawing accuracy. In addition, the drawing pen 7 can also be a ballpoint pen without the problem of tip wear, and the adapted drawing paper is kraft paper that is not easy to scratch or tear.

[0035] A measuring head 4 is provided to fit the cross-sectional profile of the threaded portion of the tap 2; the measuring head 4 is coaxially and detachably mounted on the end of the measuring rod of the micrometer 5, and the measuring head 4 and the measuring rod of the micrometer 5 are coaxially and perpendicular to the horizontal axis of the runout inspection instrument 1. During the inspection, the outer contour of the rotating tap 2 drives the measuring head 4 to run, and the running of the measuring head 4 drives the drawing pen 7 to run, so that the outer contour shape of the drawing tap 2 is continuously detected and recorded on the rotating drawing board 3.

[0036] In the above embodiment, as a preferred embodiment of the utility model: the measuring head 4 is a duckbill measuring head (such as Figure 3 , Figure 4 Specifically, the duckbill span of the duckbill measuring head is at least greater than two pitches of the tap 2, and is used to detect the outer circular shape of the threaded portion of the tap 2.

[0037] The micrometer 5 is fixedly supported and installed by a micrometer bracket 6; the micrometer bracket 6 can be horizontally moved and adjusted along the runout inspection instrument 1 to adjust the axial position of the micrometer 5 and to detect the contours of the tap 2 at different axial positions.

[0038] The measuring head 4 is provided with a drawing pen 7 facing the drawing board 3, and the tip of the drawing pen 7 is in contact with the drawing paper surface. The drawing working principle of the drawing pen 7 is as follows: the drawing pen 7 is fixedly connected to the measuring head 4 through the top screw 4-2, and the drawing pen 7 draws the outer contour shape of the tap 2 on the rotating drawing board 3 synchronously with the jumping of the measuring head 4 (combined with the drawing pen 7). Fig. 9 ).

[0039] In the above embodiment, as a preferred embodiment of the utility model: in order to avoid the displacement of the measuring head and thus affect the detection accuracy: the top of the measuring head 4 rod body is coaxially provided with a measuring head screw 4-3 (such as Figure 3 , Figure 4 , Figure 1 The measuring head screw 4-3 is coaxially fixedly connected to the internal threaded hole at the bottom center of the micrometer 5 measuring rod.

[0040] The measuring head 4 of the utility model is connected to the micrometer 5 by screw connection. On the one hand, the connection is simple and reliable. On the other hand, the micro-adjustment of the different axial heights of the measuring head 4 can be realized, thereby meeting the detection adaptability adjustment requirements of the outer contours of different types of taps 2 and the outer surface of the taps. In addition: to firmly fix the measuring head 4 in the adjusted position: the measuring head screw 4-3 is locked in position by the top screw III to prevent the measuring head 4 from loosening.

[0041] In the above embodiment, as a preferred embodiment of the utility model, in order to realize the adaptive adjustment of the drawing pen 7: the measuring head 4 rod system has a drawing pen socket 4-1 with a through-hole structure; the extension length of the drawing pen 7 can be adjusted. The socket 4-1 is plugged and adapted to install the drawing pen 7; a top screw hole 4-2 is provided perpendicular to the socket 4-1; a top screw II is installed in the top screw hole 4-2; after the extension length of the drawing pen 7 in the socket 4-1 is adjusted, the position of the drawing pen 7 adjusted in the position is locked by the top screw II.

[0042] In the above embodiment, as a further improvement of the present invention, in order to achieve 1:1 reflection of the outline of the drawing tap 2: the socket 4-1 is tilted downward, and according to a summary of multiple tap 2 models, the angle between the center line of the socket 4-1 and the horizontal axis is 15°, which is optimal, and the tip of the drawing pen 7 is coplanar with the detection surface of the measuring head 4 and the surface of the tap 2 to be detected, so as to reflect the outline of the drawing tap 2 in a 1:1 manner.

[0043] Specifically: the length of the drawing pen 7 is generally set to 30-50 mm. The drawing instrument develops the tap 2 product lengths of M8, M10, and M12 according to the benchmark, and manufactures a through-hole structure socket 4-1 with an optimal angle of 15° with the horizontal axis; and the pen tip and the surface of the tap 2 to be tested are on the same plane, and a top screw hole 4-2 is made on the end surface perpendicular to the socket 4-1 to fix and lock the position of the drawing pen 7. During testing, the length of the drawing pen 7 is adjusted so that the top point of the drawing pen 7 fits the outer circle of the surface to be tested of the workpiece tap 2 to achieve a 1:1 reflection of the outer contour of the tap. See Figure 2 As shown, it is a schematic diagram of the enlarged detailed structure of the measuring head 4 for detecting the M10 extrusion tap 2, and the plotter detecting part for detecting the outer circular contour of the tap 2; wherein, the top screw II is an M5 top screw.

[0044] The utility model relates to a method for using an extrusion tap cross-section profile plotter, which is a method for using any of the plotters, and the method comprises the following steps:

[0045] Step 1. Preparation:

[0046] Step 101 , pasting drawing paper on the drawing board 3 .

[0047] Step 102, the drawing board 3 is coaxially fixedly assembled on the tap shank of the tap 2, and the drawing board 3 is pre-installed on the tail of the tap 2. If the drawing pen 7 is not pre-installed, the micrometer 5 will not be affected in detecting the contour runout of the outer circle and tooth shape of the tap 2.

[0048] Step 103 , assembling the tap 2 on the runout inspection instrument 1 .

[0049] Step 104 , after selecting the measuring head 4 , the measuring head 4 is coaxially fixedly installed on the end of the measuring rod of the micrometer 5 ; the shape type of the selected measuring head 4 determines the profile detection object of the tap 2 .

[0050] Step 105, adjust the position of the assembled micrometer 5 on the micrometer bracket 6, adjust the axial depth of the screwing-in measuring head 4 so that the detection surface of the measuring head 4 is closely fitted to the detection surface of the tap 2, and lock the measuring head 4 after the adjusted position to prevent it from loosening.

[0051] Step 2, assembling and adjusting the drawing pen: assemble the drawing pen 7 on the measuring head 4 and adjust the position of the drawing pen 7 so that the tip of the drawing pen 7 fits the surface of the drawing paper, thereby drawing a contour image.

[0052] In the step 2, the tip of the drawing pen 7 is made coplanar with the detection surface of the measuring head 4 and the surface to be detected of the tap 2, so as to reflect the outer contour of the tap 2 in a 1:1 ratio.

[0053] The following steps may also be included between step 1 and step 2: recording displacement data: rotating the positioning shaft 1-3 of the runout inspection instrument 1 to drive the tap 2 to rotate one circle, and simultaneously recording the displacement data of the measuring head 4 of the micrometer 5 along the Z axis, i.e., the vertical direction.

[0054] Step 3, drawing: Rotate the positioning shaft 1-3 of the runout inspection instrument 1 to drive the tap 2 to rotate one circle, and draw the cross-sectional profile curve of the detection surface of the tap 2 on the drawing paper with the drawing pen 7. The obtained image can intuitively correspond to the profile change of the tap 2 (such as Figure 8 shown).

[0055] Step 4, post-processing: The displacement 2D cross-sectional profile curve image drawn in step 3 is processed and analyzed by using a dedicated image plug-in of Solid Works software to obtain a multi-segment spline curve. The obtained multi-segment spline curve is used to more accurately obtain the cross-sectional shape and size of the tap 2.

[0056] like Figure 7 Figure 8 After comparison, it can be seen that the 2D image obtained by the plotter of the utility model can intuitively reflect the continuous change of the outer contour of the tap even without being processed by SolidWorks software; not only that, the image processed by SolidWorks software can also obtain a more accurate and complete cross-sectional contour shape and size of the extrusion tap 2. Figure 7 As shown, only the high point working part is shown, and it is a discrete dot matrix image. In the subsequent research and development process, it should be noted that if the image obtained by the detection of the utility model is combined with the image of the Zhuole tool detection center, the accuracy of research and development can be better improved.

[0057] The working principle of the utility model is as follows: Referring to the steps of the method of the utility model, the function of the drawing instrument of the utility model is to draw the cross-sectional profile of the special-shaped shaft parts, that is, the extrusion tap 2, and to provide a function of converting the spatial motion of the tap 2 into the plane motion. When used, Figure 1 As shown in the figure, the plotter is assembled and adjusted. The plotter prepared according to step 1 causes the measuring head 4 at the end of the micrometer 5 to jump by rotating the tap 2. The outline of the tap 2 is intuitively drawn on the drawing paper of the drawing board 3 by the drawing pen 7 that jumps with the measuring head 4, so that the test result is conveniently obtained. The test result is synchronous, intuitive, accurate, and convenient to obtain.

[0058] From the above description, it can be found that the measuring head 4 of the utility model can be selectively installed. After the specific shape of the measuring head 4 is selected and the measuring head 4 is installed, the rod system of the measuring head 4 is provided with a drawing pen socket 4-1. When the socket is set tilted downward, especially when the tip of the drawing pen 7 is coplanar with the detection surface of the measuring head 4 and the surface to be detected of the tap 2, a 1:1 reflection of the cross-sectional profile of the drawing tap 2 can be achieved, and the detection result is intuitive, accurate and efficient.

[0059] The plotter of the utility model has low manufacturing cost and is easy to use. Due to the yield force of the micrometer 5 itself, the runout of the cross section of the extrusion tap 2 can be accurately measured, and the shape of the cross section of the extrusion tap 2 can be drawn; therefore, the drawing pen 7 can draw the shape of the cross section of the extrusion tap 2 on the drawing paper, thereby realizing the sectional shape detection that meets the design needs.

[0060] The plotter of the utility model has a detachable measuring head 4, a micrometer 5 and a plotter pen 7, so it can be conveniently installed and disassembled, and is also convenient for adjustment.

[0061] In practical applications, the utility model selects different measuring heads 4 and micrometers 5 for combination according to different specifications and detection requirements of the extrusion taps 2 to meet the detection requirements of various different taps 2; and according to the different pitches and contour sizes of the extrusion taps 2 to be detected, the micrometer bracket 6 is horizontally moved and locked with a fastening bolt to adjust the relative axial position of the micrometer 5 on the micrometer bracket 6 for detecting the tap 2, and the utility model has excellent versatility.

[0062] The measuring head 4 of the utility model is fixed to the measuring rod of the micrometer 5 by threaded connection, and the position of the measuring head 4 is locked by the top screw III, so as to realize the self-locking of the measuring head 4 and avoid the shaking or deviation of the measuring head 4 during the movement, thereby affecting the detection accuracy.

[0063] In summary, the utility model is used to realize the drawing of the cross-section of special-shaped shaft parts, namely the extrusion tap 2, and provides a function of converting spatial motion into planar motion; it can accurately, intuitively, cheaply, conveniently and efficiently detect the contour size and shape of the cross-section to be detected of the extrusion tap 2, is suitable for popularization, and helps to improve the progress of research and development.

[0064] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An extrusion tap cross-section profile drawing instrument, comprising a runout inspection instrument (1); characterized in that: The runout inspection instrument (1) has horizontal coaxial supports (1-1) at both ends coaxially clamping the tap (2) to be inspected; a drawing board (3) is coaxially fixedly installed on the tap handle of the tap (2) and the drawing board (3) rotates coaxially with the tap (2); a drawing paper is provided on the drawing surface of the drawing board (3); a measuring head (4) is provided in contact with the contour of the threaded portion of the tap (2); the measuring head (4) is coaxially detachably installed on the end of the measuring rod of the micrometer (5), and the measuring head (4) and the micrometer are connected to each other. The dial gauge (5) is coaxially perpendicular to the horizontal axis of the runout tester (1); the dial gauge (5) is fixedly supported and installed by a dial gauge bracket (6); the dial gauge bracket (6) can be horizontally moved and adjusted along the runout tester (1); the measuring head (4) is installed with a drawing pen (7) facing the drawing board (3), and the tip of the drawing pen (7) is in contact with the surface of the drawing paper, and the drawing pen (7) draws the outer contour of the tap (2) along with the running measuring head (4).

2. The plotter according to claim 1, characterized in that: The runout inspection instrument (1) comprises a base platform (1-2); two ends of the base platform (1-2) are respectively slidably adapted to be mounted with two supports (1-1) relative to or towards each other; the top ends of the two supports (1-1) are respectively provided with coaxial positioning shafts (1-3); a handle (1-4) drives the positioning shafts (1-3) to rotate; a dial gauge bracket (6) is mounted on the base platform (1-2); and a dial gauge (5) is mounted on the dial gauge bracket (6).

3. The plotter according to claim 1, characterized in that: The drawing plate (3) is composed of a shaft sleeve (3-1), an annular plate (3-2), and a top screw I (3-3); the shaft sleeve (3-1) and the annular plate (3-2) are coaxially fixedly connected as a whole; the shaft sleeve (3-1) and the taper shank of the tap (2) are coaxially adapted and fixedly connected, and the shaft sleeve (3-1) is locked by the top screw I (3-3).

4. The plotter according to claim 1, characterized in that: The measuring head (4) is a duckbill measuring head; the duckbill span of the duckbill measuring head is at least greater than two pitches of the tap (2), and is used to detect the outer circular shape of the threaded portion of the tap (2).

5. The plotter according to claim 1 or 4, characterized in that: The measuring head (4) has a measuring head screw (4-3) coaxially formed on the top of the rod body; the measuring head screw (4-3) is coaxially fixedly connected to an internal threaded hole formed at the center of the bottom end of the measuring rod of the micrometer (5), and the measuring head screw (4-3) is locked in position by a top screw III.

6. The plotter according to claim 1 or 4, characterized in that: The measuring head (4) has a rod system with a drawing pen insertion hole (4-1) of a through-hole structure; the insertion hole (4-1) is plugged and adapted to install a drawing pen (7); a top screw hole (4-2) is provided perpendicular to the insertion hole (4-1); a top screw II is installed in the top screw hole (4-2); and the top screw II locks the position of the drawing pen (7).

7. The plotter according to claim 6, characterized in that: The plug hole (4-1) is arranged to be tilted downward, and the angle between the center line of the plug hole (4-1) and the horizontal axis is 15°, and the tip of the drawing pen (7) is coplanar with the detection surface of the measuring head (4) and the surface to be detected of the tap (2), so as to reflect the contour of the drawing tap (2) in a 1:1 manner.

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