Deep hole coaxiality detection measuring tool

Abstract

The utility model discloses a deep hole coaxiality detection measuring tool, comprising a measuring rod, the outer peripheral surface of which is provided with a positioning hole; the first positioning disc is sleeved and fixed on the measuring rod and is close to one end of the measuring rod; the second positioning disc is fixedly arranged on the measuring rod in a sleeving manner and is close to the other end of the measuring rod, the outer diameter of the second positioning disc is smaller than that of the first positioning disc, and when the measuring rod is inserted into a deep step through hole of a workpiece from one end of the second positioning disc, the second positioning disc is used for being matched with the first positioning disc; according to the technical scheme, whether the head end and the tail end of the deep step through hole meet the coaxiality requirement or not can be measured by the workpiece, the position degree of a radial hole of the workpiece can be measured, the hole diameter of the deep step through hole can be measured, and the distance between the head inner hole and the tail inner hole which are arranged at intervals of the workpiece can be measured.

Description

Technical Field

[0001] The utility model relates to the technical field of inner hole detection of a drill collar workpiece, in particular to a deep hole coaxiality detection measuring tool. Background Art

[0002] The coaxiality of the inner hole of the drill collar refers to the degree of deviation between the center line of the hole and the outer circle of the hole diameter. Due to the long length of the drill collar and the deep inner hole of the drill collar, the existing measuring tools cannot be inserted into the inner hole of the drill collar to measure the coaxiality of the inner hole of the drill collar. At the same time, it is difficult to measure the position of the radial hole of the drill collar at one time. Utility Model Content

[0003] The main purpose of the utility model is to provide a deep hole coaxiality detection measuring tool, which is intended to measure the coaxiality of a deep step through hole of a workpiece, the position of a radial hole of a workpiece, the aperture of the deep step through hole, and the spacing between the first and last inner holes of the workpiece.

[0004] To achieve the above-mentioned purpose, the deep hole coaxiality detection measuring tool proposed in the utility model comprises a measuring rod, wherein the outer peripheral surface of the measuring rod is provided with a positioning hole for cooperating with the radial hole of the workpiece for positioning;

[0005] A first positioning disc is sleeved and fixed on the measuring rod and close to one end of the measuring rod, and is positioned and matched with the first section of the deep step through hole of the workpiece; and

[0006] The second positioning disc is sleeved and fixed on the measuring rod and close to the other end of the measuring rod, and cooperates with the second section of the deep step through hole of the workpiece.

[0007] The outer diameter of the second positioning disc is smaller than that of the first positioning disc. When the measuring rod is inserted into the deep step through hole of the workpiece from one end of the second positioning disc, the second positioning disc and the first positioning disc are positioned with the inner walls of the second section of the deep step through hole of the workpiece and the first section of the deep step through hole of the workpiece respectively, so that the two ends of the measuring rod can measure the coaxiality of the two ends of the deep step through hole of the workpiece.

[0008] Preferably, it also includes a positioning pin, when the measuring rod is inserted into the deep step through hole of the workpiece, the positioning pin is inserted into the radial hole of the workpiece and inserted into the positioning hole, so as to measure the position of the radial hole.

[0009] Preferably, when the end surface of the second positioning disc away from the first positioning disc abuts against the second step of the deep step through hole, the first positioning disc abuts against or is close to the first step of the deep step through hole to measure the distance between the first step and the second step.

[0010] Preferably, when the first positioning disc or the second positioning disc is coaxial with the deep step through hole of the workpiece and fits against the inner wall of the deep step through hole, the first positioning disc or the second positioning disc is used to measure the aperture of the deep step through hole of the workpiece.

[0011] Preferably, the measuring rod, the first positioning disc and the second positioning disc are all made of aluminum alloy, and a plurality of weight-reducing grooves are formed on the end surface of the first positioning disc.

[0012] Preferably, a threaded connection portion is provided at one end of the measuring rod near the position where the second positioning disc is installed, and an internal thread groove cooperating with the threaded connection portion is provided on the inner wall of the second positioning disc.

[0013] Preferably, a section of the measuring rod used to install the first positioning disc is provided with a threaded fastening hole, and the first positioning disc is radially penetrated with a connecting through hole that can be communicated with the threaded fastening hole, and a fastening screw matching the threaded fastening hole is inserted in the connecting through hole to fix the first positioning disc on the measuring rod.

[0014] Preferably, the first positioning disc is radially penetrated with a plurality of spaced connecting through holes, and the outer circumference of the measuring rod is provided with threaded fastening holes which are in one-to-one communication with the plurality of connecting through holes.

[0015] Preferably, a section of the measuring rod used for installing the first positioning disc is provided with a plurality of installation stations distributed at intervals, and each of the plurality of installation stations is provided with a plurality of the threaded fastening holes.

[0016] Preferably, the fastening screw comprises a countersunk head, a rod and a threaded portion which are arranged in sequence, the threaded portion cooperates with the threaded fastening hole, and the outer circumference of the first positioning disk is provided with a countersunk groove which is connected to the connecting through hole, and the countersunk groove is used to accommodate the countersunk head.

[0017] The technical solution of the utility model adopts a measuring rod equipped with a first positioning disc and a second positioning disc, inserts the measuring rod from one end of the second positioning disc into the deep step through hole of the workpiece, and makes the second positioning disc cooperate with the second section of the inner hole wall of the deep step through hole, and makes the first positioning disc cooperate with the first section of the inner hole wall of the deep step through hole, and measures the coaxiality between the head end of the measuring rod and the head end of the deep step through hole, and between the tail end of the measuring rod and the tail end of the deep step through hole at this time, so as to measure whether the deep step through hole meets the coaxiality requirement, and at the same time, the position of the radial hole of the workpiece can be measured by the positioning pin, and the aperture of the deep step through hole can be measured by the outer diameters of the first positioning disc and the second positioning disc, and the spacing between the first and tail inner holes of the workpiece can be measured by the spacing between the first and second positioning discs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the deep hole coaxiality detection measuring tool of the utility model;

[0020] Figure 2 An exploded view of an embodiment of the deep hole coaxiality detection measuring tool of the utility model;

[0021] Figure 3 This is a structural schematic diagram of the first positioning disc of the deep hole coaxiality detection measuring tool of the utility model;

[0022] Figure 4 This is a schematic diagram of the assembly of the first positioning disc of the deep hole coaxiality detection measuring tool of the utility model;

[0023] Figure 5 This is a cross-sectional view of the deep hole coaxiality detection measuring tool of the utility model in use.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 Deep hole coaxiality detection tool 40 Fastening screw 10 Measuring rod 41 Heavy head 11 Positioning hole 42 Rod 12 Threaded fastening holes 43 Threaded part 13 Threaded connection 200 Workpiece 20 First positioning disc 210 First step 21 Countersunk groove 220 The second step 22 Weight reduction slot 230 Deep step hole 23 Connecting through holes 240 Radial holes 30 Second positioning disc

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] 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 of 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.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] The utility model provides a deep hole coaxiality detection measuring tool 100.

[0031] Reference Figures 1 to 5 , Figure 1 It is a structural schematic diagram of an embodiment of the deep hole coaxiality detection measuring tool of the utility model; Figure 2 An exploded view of an embodiment of the deep hole coaxiality detection measuring tool of the utility model; Figure 3 This is a structural schematic diagram of the first positioning disc of the deep hole coaxiality detection measuring tool of the utility model; Figure 4 This is a schematic diagram of the assembly of the first positioning disc of the deep hole coaxiality detection measuring tool of the utility model; Figure 5 This is a cross-sectional view of the deep hole coaxiality detection measuring tool of the utility model in use.

[0032] In the embodiment of the utility model, the deep hole coaxiality detection measuring tool 100 includes a measuring rod 10, a first positioning disc 20 and a second positioning disc 30; Figure 1 , Figure 5 As shown, the outer circumferential surface of the measuring rod 10 is provided with a positioning hole 11 for cooperating with the radial hole 240 of the workpiece 200 for positioning, the first positioning disc 20 is sleeved and fixed on the measuring rod 10 and close to one end of the measuring rod 10, and is positioned and matched with the first section of the deep step through hole 230 of the workpiece 200, the second positioning disc 30 is sleeved and fixed on the measuring rod 10 and close to the other end of the measuring rod 10, and is matched with the second section of the deep step through hole 230 of the workpiece 200, the outer diameter of the second positioning disc 30 is smaller than the first positioning disc 20, when the measuring rod 10 is inserted into the deep step through hole 230 of the workpiece 200 from one end of the second positioning disc 30, the second positioning disc 30 and the first positioning disc 20 are positioned with the inner wall of the second section of the deep step through hole 230 of the workpiece 200 and the first section of the deep step through hole 230 of the workpiece 200 respectively, so that the two ends of the measuring rod 10 can measure the coaxiality of the two ends of the deep step through hole 230 of the workpiece 200.

[0033] In this embodiment, the workpiece 200 is generally a drill collar having a deep step through hole 230, and the deep step through hole 230 is composed of multiple sections of inner holes with decreasing inner diameters in sequence. A first step 210 is provided at the connection between the first section and the second section of the deep step through hole 230, and a second step 220 is provided at the connection between the second section and the third section of the deep step through hole 230. The first section of the deep step through hole 230 cooperates with the first positioning disc 20, and the second section of the deep step through hole 230 cooperates with the second positioning disc 30. When the measuring rod 10 is inserted into the deep step through hole 2 30, insert the second positioning disc 30 from one end into the deep step through hole 230, the second positioning disc 30 is positioned and matched with the second section inner wall of the deep step through hole 230, and the first positioning disc 20 is positioned and matched with the first section inner wall of the deep step through hole 230, and the coaxiality of the head end of the measuring rod 10 and the head end of the deep step through hole 230, and the tail end of the measuring rod 10 and the tail end of the deep step through hole 230 are measured. When they are all coaxial, the deep step through hole 230 meets the coaxiality requirement, and when they are not coaxial, the deep step through hole 230 does not meet the coaxiality requirement.

[0034] The technical solution of the utility model measures the coaxiality of the deep hole inside the workpiece 200 by adopting a measuring rod 10 equipped with a first positioning disc 20 and a second positioning disc 30. During the measurement, the second positioning disc 30 is inserted into the deep step through hole 230 of the workpiece 200 from one end. At this time, the second positioning disc 30 is in contact with the second section of the inner hole wall of the deep step through hole 230, and the first positioning disc 20 is in contact with the first section of the inner hole wall of the deep step through hole 230. By measuring the coaxiality between the head end of the measuring rod 10 and the head end of the deep step through hole 230, and the tail end of the measuring rod 10 and the tail end of the deep step through hole 230, it is measured whether the coaxiality of the head and tail ends of the deep step through hole 230 meets the requirements.

[0035] Furthermore, a positioning pin (not shown in the figure) is included. When the measuring rod 10 is inserted into the deep step through hole 230 of the workpiece 200, the positioning pin is inserted into the radial hole 240 of the workpiece 200 and inserted into the positioning hole 11, so as to measure the position of the radial hole 240. In this embodiment, when the measuring rod 10 is inserted into the deep step through hole 230, the positioning pin is inserted from the radial hole 240 on the outer periphery of the workpiece 200 into the deep step through hole 230, and the matching degree between the positioning pin and the positioning hole 11 on the measuring rod 10 is observed. When it can be fully inserted therein, the position can be measured to be qualified.

[0036] Preferably, when the end surface of the second positioning disc 30 away from the first positioning disc 20 abuts against the second step 220 of the deep step through hole 230, in combination with reference Figure 5As shown, the first positioning disc 20 abuts against or is close to the first step 210 of the deep step through hole 230, and is used to measure the distance between the first step 210 and the second step 220. In this embodiment, specifically, when the second positioning disc 30 abuts against the second step 220, it is observed whether the first positioning disc 20 abuts against the first step 210. When the first positioning disc 20 abuts against the first step 210, the distance between the first positioning disc 20 and the second positioning disc 30 is the first step 210. The distance between the first step 210 and the second step 220, that is, the length of the second section deep step through hole 230, when the first positioning disc 20 is one end away from the first step 210, the distance between the first positioning disc 20 and the first step 210 plus the distance between the first positioning disc 20 and the second positioning disc 30 is the distance between the first step 210 and the second step 220, that is, the distance between the first step 210 and the second step 220, thereby realizing the measurement of the distance between the first and last inner holes of the workpiece 200 spaced apart.

[0037] Preferably, when the first positioning disc 20 or the second positioning disc 30 is coaxial with the deep step through hole 230 of the workpiece 200 and fits with the inner wall of the deep step through hole 230, the reference Figure 5 As shown, the first positioning disc 20 or the second positioning disc 30 is used to measure the aperture of the deep step through hole 230 of the workpiece 200 .

[0038] Specifically, when the measuring rod 10 is inserted into the deep step through hole 230, when the first positioning disc 20 fits against the inner wall of a section of the inner hole of the deep step through hole 230, the outer diameter of the first positioning disc 20 is the inner diameter of the section of the deep step through hole 230, and when the second positioning disc 30 fits against the inner wall of the inner hole at the other end of the deep step through hole 230, the outer diameter of the second positioning disc 30 is the inner diameter of the other section of the deep step through hole 230, so that the inner diameter of the deep step through hole 230 can be measured by the first positioning disc 20 and the second positioning disc 30.

[0039] Preferably, the measuring rod 10, the first positioning disc 20 and the second positioning disc 30 are made of aluminum alloy. Figure 3 , Figure 4 As shown, the end surface of the first positioning disc 20 is provided with a plurality of weight-reducing grooves 22. Specifically, in this embodiment, the measuring rod 10, the first positioning disc 20 and the second positioning disc 30 made of aluminum alloy, and the weight-reducing grooves 22 provided in the second positioning disc 30 can all reduce the weight of the measuring tool; at the same time, the material of the measuring tool is relatively soft, and when the measuring tool is in contact with the workpiece 200 for measurement, the inner wall of the deep step through hole 230 of the workpiece 200 to be measured will not be scratched.

[0040] Furthermore, a threaded connection portion 13 is provided at one end of the measuring rod 10 near the position where the second positioning disc 30 is installed. Figure 2 , Figure 5 As shown, the inner wall of the second positioning disc 30 is provided with an internal thread groove that matches the threaded connection portion 13. Specifically, in this embodiment, the measuring rod 10 is a step rod, and a connection step is provided at the connection between the thinner section and the thicker section of the measuring rod 10, and a connecting portion is provided protruding from the thinner section of the measuring rod 10 near the thicker section, and the outer diameter of the connecting portion is slightly smaller than the outer diameter of the thicker section of the measuring rod 10, and the connecting portion is provided with an external thread groove to form the threaded connection portion 13. When the second positioning disc 30 is threadedly installed on the threaded connection portion 13 through the internal thread groove of its inner wall, the end face of the second positioning disc 30 abuts against the connection step of the measuring rod 10 to achieve the installation of the second positioning disc 30.

[0041] Further, a section of the measuring rod 10 for mounting the first positioning disc 20 is provided with a threaded fastening hole 12. Figure 2 , Figure 3 As shown, the first positioning disc 20 is radially provided with a connecting through hole 23 that can be communicated with the threaded fastening hole 12, and a fastening screw 40 that matches the threaded fastening hole 12 is inserted in the connecting through hole 23, which is used to fix the first positioning disc 20 on the measuring rod 10. Specifically, the first positioning disc 20 is sleeved on the measuring rod 10 and slides along the measuring rod 10. When the first positioning disc 20 slides to the position where the threaded fastening hole 12 is provided on the measuring rod 10, the connecting through hole 23 on the first positioning disc 20 is aligned with the threaded fastening hole 12, and the fastening screw 40 is inserted into the connecting through hole 23 and inserted into the threaded fastening hole 12 to be tightened, so that the first positioning disc 20 is fixed on the measuring rod 10 by the fastening screw 40, and the first positioning disc 20 is installed and fixed on the measuring rod 10.

[0042] Preferably, the first positioning disc 20 is provided with a plurality of spaced connecting through holes 23 in the radial direction. Figure 3 , Figure 4 As shown, the outer circumference of the measuring rod 10 is provided with threaded fastening holes 12 that are in one-to-one communication with a plurality of connecting through holes 23. Specifically, in the present embodiment, the number of connecting through holes 23 is set according to the number of weight-reducing grooves 22. Since the connecting through hole 23 penetrates the first positioning disc 20 between two weight-reducing grooves 22, the connecting through hole 23 is arranged between adjacent weight-reducing grooves 22. Here, it is preferred that the number of weight-reducing grooves 22 is four, and the number of corresponding connecting through holes 23 is also four, and the number of threaded fastening holes 12 corresponding to the connecting through holes 23 is also four, so that when the first positioning disc 20 is installed to the measuring rod 10, the connection force between the first positioning disc 20 and the measuring rod 10 can be balanced, and the firmness of the fixing of the first positioning disc 20 can be increased, so as to avoid the first positioning disc 20 being installed with insufficient precision, which affects the detection of the coaxiality of the inner hole of the workpiece 200.

[0043] Further, a section of the measuring rod 10 for installing the first positioning disc 20 is provided with a plurality of installation stations distributed at intervals, and Figure 4 As shown, multiple installation stations are provided with multiple threaded fastening holes 12. In this embodiment, the installation stations are preferably three groups, and each group of installation stations is provided with multiple threaded fastening holes 12 of the same number, the same aperture size, and the same arrangement, so that when the first positioning disc 20 is installed on the measuring rod 10, the first positioning disc 20 has multiple adjustable installation positions, and when performing deep hole coaxiality detection with the second positioning disc 30, the coaxiality of the inner holes of more than 200 specifications of different workpieces can be measured, so that the deep hole coaxiality detection gauge 100 can be universal.

[0044] Preferably, the fastening screw 40 includes a countersunk head 41, a rod 42 and a threaded portion 43 arranged in sequence. Figure 4 As shown, the threaded portion 43 is matched with the threaded fastening hole 12, and the outer circumference of the first positioning disc 20 is provided with a countersunk groove 21 connected with the connecting through hole 23, and the countersunk groove 21 is used to accommodate the countersunk head 41. Specifically, the threaded portion 43 is arranged at the lower end of the fastening screw 40. When the fastening screw 40 is used to fix the first positioning disc 20, it is not necessary to make the fastening screw 40 threadedly matched with the connecting through hole 23 on the first positioning disc 20, but only to make the fastening screw 40 threadedly matched with the threaded fastening hole 12 on the measuring rod 10, thereby reducing the required accuracy of the matching of each component of the measuring tool, thereby improving the production and processing efficiency of the measuring tool, and at the same time, the countersunk groove 21 arranged on the outer circumference of the first positioning disc 20 can accommodate the countersunk head 41, so as to avoid the countersunk head 41 of the fastening screw 40 being exposed and interfering with the measurement operation of the outer circumference of the first positioning disc 20.

[0045] The technical solution of the utility model adopts a measuring rod 10 equipped with a first positioning disc 20 and a second positioning disc 30, and inserts the measuring rod 10 from one end of the second positioning disc 30 into the deep step through hole 230 of the workpiece 200, and makes the second positioning disc 30 cooperate with the second section of the inner hole wall of the deep step through hole 230, so that the first positioning disc 20 cooperates with the first section of the inner hole wall of the deep step through hole 230, and measures the coaxiality between the head end of the measuring rod 10 and the head end of the deep step through hole 230, and the tail end of the measuring rod 10 and the tail end of the deep step through hole 230 at this time, so as to measure whether the deep step through hole 230 meets the coaxiality requirement, and at the same time, the aperture of the deep step through hole 230 is measured by the outer diameter of the first positioning disc 20 and the second positioning disc 30, and the spacing between the first and tail inner holes of the workpiece 200 is measured by the spacing between the first positioning disc 20 and the second positioning disc 30, and the position of the radial hole 240 of the workpiece 200 is measured by the positioning pin.

[0046] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A deep hole coaxiality detection tool, It is characterized in that include A measuring rod, wherein the outer peripheral surface of the measuring rod is provided with a positioning hole for cooperating with the radial hole of the workpiece for positioning; A first positioning disc is sleeved and fixed on the measuring rod and close to one end of the measuring rod, and is positioned and matched with the first section of the deep step through hole of the workpiece; and The second positioning disc is sleeved and fixed on the measuring rod and close to the other end of the measuring rod, and cooperates with the second section of the deep step through hole of the workpiece. The outer diameter of the second positioning disc is smaller than that of the first positioning disc. When the measuring rod is inserted into the deep step through hole of the workpiece from one end of the second positioning disc, the second positioning disc and the first positioning disc are positioned with the inner walls of the second section of the deep step through hole of the workpiece and the first section of the deep step through hole of the workpiece respectively, so that the two ends of the measuring rod can measure the coaxiality of the two ends of the deep step through hole of the workpiece.

2. The deep hole coaxiality detection measuring tool as claimed in claim 1, It is characterized in that It also includes a positioning pin. When the measuring rod is inserted into the deep step through hole of the workpiece, the positioning pin is inserted into the radial hole of the workpiece and inserted into the positioning hole to measure the position of the radial hole.

3. The deep hole coaxiality detection measuring tool as claimed in claim 1, It is characterized in that When the end surface of the second positioning disc away from the first positioning disc abuts against the second step of the deep step through hole, the first positioning disc abuts against or is close to the first step of the deep step through hole to measure the distance between the first step and the second step.

4. The deep hole coaxiality detection measuring tool as claimed in claim 1, It is characterized in that When the first positioning disc or the second positioning disc is coaxial with the deep step through hole of the workpiece and fits with the inner wall of the deep step through hole, the first positioning disc or the second positioning disc is used to measure the aperture of the deep step through hole of the workpiece.

5. The deep hole coaxiality detection measuring tool as claimed in claim 1, It is characterized in that The measuring rod, the first positioning disc and the second positioning disc are all made of aluminum alloy, and a plurality of weight-reducing grooves are formed on the end surface of the first positioning disc.

6. The deep hole coaxiality detection measuring tool as claimed in claim 1, It is characterized in that A threaded connection portion is provided at one end of the measuring rod near the position where the second positioning disc is installed, and an internal thread groove matching the threaded connection portion is provided on the inner wall of the second positioning disc.

7. The deep hole coaxiality detection measuring tool as claimed in claim 6, It is characterized in that A section of the measuring rod for mounting the first positioning disc is provided with a threaded fastening hole, and the first positioning disc is radially penetrated with a connecting through hole that can be communicated with the threaded fastening hole. A fastening screw matching the threaded fastening hole is inserted in the connecting through hole to fix the first positioning disc on the measuring rod.

8. The deep hole coaxiality detection measuring tool as claimed in claim 7, It is characterized in that The first positioning disc is radially penetrated with a plurality of spaced connecting through holes, and the outer circumference of the measuring rod is provided with threaded fastening holes which are in one-to-one communication with the plurality of connecting through holes.

9. The deep hole coaxiality detection measuring tool as claimed in claim 8, It is characterized in that A section of the measuring rod used for installing the first positioning disc is provided with a plurality of installation stations distributed at intervals, and each of the plurality of installation stations is provided with a plurality of the threaded fastening holes.

10. The deep hole coaxiality detection measuring tool according to any one of claims 7 to 9, It is characterized in that The fastening screw includes a countersunk head, a rod and a threaded portion which are arranged in sequence, the threaded portion cooperates with the threaded fastening hole, and a countersunk groove which is connected to the connecting through hole is opened on the outer circumference of the first positioning disk, and the countersunk groove is used to accommodate the countersunk head.

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