Small and medium hole adjusting rod

Abstract

The utility model relates to the field of workpiece inner hole correction and adjustment, in particular to a small and medium hole correction and adjustment rod. The other end of the top end of the operating table is connected with a placing frame in a sliding manner; an electric push rod is assembled at the other end in the operating table; the output end of the electric push rod is fixed with the placing frame; a workpiece is assembled at one end of the placing frame; a motor is fixed to the outer side of the electromagnetic disc, and a supporting boring rod is clamped to one side in the motor. According to the small and medium hole calibration rod provided by the utility model, the electromagnetic disc is started to be adsorbed on the surface of the placement seat, the adsorption position is determined according to the position of an inner hole to be tested, and then the cylindrical buckle II and the cylindrical buckle III are rotated to adjust according to the position of the inner hole of a workpiece, so that the dial indicator tests the inner hole of the workpiece; and the extension rod I and the cylindrical buckle I as well as the cylindrical buckle II and the extension rod II stretch out and draw back, so that adjustment can be performed according to the position of the workpiece.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of workpiece inner hole school adjusts, especially a small and medium hole school adjusts pole. BACKGROUND

[0002] In the field of mechanical processing, especially in the manufacturing process of ship repairing products, the inner hole machining precision of box type parts is often high. In order to ensure the processing quality, the processing reference must be confirmed first, and accurate and reliable measurement and adjustment means are adopted when the inner hole is adjusted, and the small and medium hole adjustment rod plays a key role in this process as a special tool.

[0003] In ship repairing products, workpieces that need to be bored to process inner holes are often encountered, such as drum, A-shaped frame, gear box and other box type parts. First, the processing reference needs to be confirmed, and when the inner hole is adjusted, a magnetic table seat is usually needed, one end of which is adsorbed on the main shaft of the machine tool, and the other end clamps the dial gauge, and the best adjustment position is obtained through the adjustment of the support rod.

[0004] When the above-mentioned technology is used, it is found that the existing technology has the following technical problems: first, the existing technology, due to the connection mode of the dial gauge and the front connecting piece, causes the dial gauge and the front connecting piece to occupy a range that is not convenient for testing smaller inner holes, thereby reducing the usability of the dial gauge for testing smaller inner holes, secondly, the magnetic table seat and the connecting rod buckle and the knob itself have a certain volume, which is adsorbed on the outer circle of the main shaft, occupying a lot of radial adjustment space of the inner hole, so it is not convenient to adjust the distance according to the workpiece to be bored to process the inner hole, and the traditional support boring bar and connecting piece connection mode is not convenient for telescopic adjustment, thereby occupying the adjustment space of the device, thereby reducing the practicability and convenience of the device, therefore, we design a small and medium hole adjustment rod to provide another technical solution for the above technical problems. INVENTION CONTENTS

[0005] Therefore, it is necessary to provide a small and medium hole adjustment rod for the above technical problems, which assembles the workpiece to be bored to process the inner hole on the placing rack, and then starts the electric push rod to drive the workpiece to be bored to process the inner hole to adjust to the distance most suitable for inner hole testing, and then starts the electromagnetic disc to be adsorbed on the surface of the installation seat, at this time, the adsorbed position is determined according to the position of the inner hole to be tested, and then rotates the cylindrical buckle two and the cylindrical buckle three to adjust according to the position of the inner hole of the workpiece, so that the dial gauge tests the inner hole of the workpiece, and the extension rod one and the cylindrical buckle one and the cylindrical buckle two and the extension rod two are telescopic, so as to adjust according to the position of the workpiece, facilitate the workpiece to be tested and recorded, greatly improve the practicability and convenience of the device.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The utility model provides a small and medium -sized hole school adjusts the pole, including the operating platform, one end of operating platform top is fixed with the installation seat, the other end of operating platform top is connected with the placement frame of sliding, one end of placement frame is equipped with work piece, one end of installation seat is magnetized with the electromagnetic disc, the outside fixed of electromagnetic disc has the motor, one side of motor inside is connected with the support boring bar of card, one end of support boring bar is fixed with cylinder buckle no.

[0008] As a preferred implementation form of the small and medium -sized hole school adjusts the pole provided by the utility model, the other end of the operating platform is equipped with an electric push rod, and the output end of the electric push rod is fixed with the placement frame.

[0009] As a preferred implementation form of the small and medium -sized hole school adjusts the pole provided by the utility model, the outside of the cylinder buckle no. is provided with a positioning mechanism for adjusting the length of the extension rod no. 1, the positioning mechanism comprises a sleeve nut no. 1, the outside of the cylinder buckle no. 1 is threadedly connected with the sleeve nut no. 1, the left end of the cylinder buckle no. 1 is smaller in diameter than the right end, and the inside of the support boring bar is slidably connected with the extension rod no. 1.

[0010] As a preferred implementation form of the small and medium -sized hole school adjusts the pole provided by the utility model, the outside of the extension rod no. 1 is fixed with an anti -skid strip, and the outside of the anti -skid strip is slidably connected with the cylinder buckle no. 1.

[0011] As a preferred implementation form of the small and medium -sized hole school adjusts the pole provided by the utility model, the inside of the cylinder buckle no. 2 is provided with a limiting mechanism for adjusting the extension and retraction of the extension rod no. 2, the limiting mechanism comprises a sleeve nut no. 2, the left end of the cylinder buckle no. 2 is smaller in diameter than the right end, and the outside of the cylinder buckle no. 2 is threadedly connected with the sleeve nut no. 2 close to the extension rod no. 2.

[0012] As a preferred implementation form of the small and medium -sized hole school adjusts the pole provided by the utility model, the outside of the extension rod no. 2 is fixed with an anti -skid pad, and the outside of the anti -skid pad is slidably connected with the cylinder buckle no. 2.

[0013] As a preferred implementation form of the small and medium -sized hole school adjusts the pole provided by the utility model, the inside of the cylinder buckle no. 3 is provided with a fixing mechanism for positioning the percent table, the left end of the cylinder buckle no. 3 is smaller in diameter than the right end, and the outside of the cylinder buckle no. 3 is threadedly connected with a sleeve nut no. 3 away from the extension rod no. 2.

[0014] As a preferred implementation form of the middle and small hole calibration adjusting rod provided by the utility model, the inside of the extension rod one and the two sides of the cylindrical buckle two are fixed with anti-skid lines one.

[0015] As a preferred implementation form of the middle and small hole calibration adjusting rod provided by the utility model, the inside of the extension rod one and the two sides of the cylindrical buckle two are fixed with anti-skid lines one.

[0016] As a preferred implementation form of the middle and small hole calibration adjusting rod provided by the utility model, the inside of the extension rod one and the two sides of the cylindrical buckle two are fixed with anti-skid lines one.

[0017] It can be seen without doubt that the above technical scheme of the application can solve the technical problems to be solved by the application.

[0018] Meanwhile, the utility model has at least the following beneficial effects through the above technical scheme:

[0019] The middle and small hole calibration adjusting rod provided by the utility model is adsorbed on the surface of the placing seat by starting the electromagnetic disc, the adsorbed position is determined according to the position of the hole to be tested, the extension rod one and the cylindrical buckle two and the extension rod two and the cylindrical buckle three are rotated and adjusted, when the position of the tested hole of the workpiece is adjusted to the appropriate position of the dial gauge, the extension rod one and the extension rod two are extruded by rotating the two nuts respectively, so as to improve the stability of the dial gauge test.

[0020] The extension rod two is extended away from the cylindrical buckle two and the extension rod one is extended away from the cylindrical buckle one, then the cylindrical buckle one and the cylindrical buckle two are extruded by the sleeve nut one and the sleeve nut two, so as to improve the stability of the extension rod one and the extension rod two, and then the hole distance position of the workpiece is adjusted and tested.

[0021] The dial gauge is arranged in a z shape, so as to test smaller holes.

[0022] The extension rod one, the cylindrical buckle two, the extension rod two and the cylindrical buckle three are connected by the nuts and the screw rods in the form of bolts, the cylindrical buckle one and the extension rod one and the cylindrical buckle two and the extension rod two are slidingly connected, and the support boring bar is slidingly connected with the motor, so that the device can be disassembled and replaced, the replacement and maintenance effect of the parts of the device is greatly improved, the maintenance cost of the device is reduced, and the use cost of the device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0025] Figure 2 It is a schematic diagram of the side structure of the overall structure of the present application.

[0026] Figure 3 It is a schematic diagram of the structure among the supporting boring bar, the cylindrical buckle two and the cylindrical buckle three of the present application.

[0027] Figure 4 It is a schematic diagram of the structure between the electromagnetic disc and the cylindrical buckle three of the present application.

[0028] Figure 5 It is a schematic diagram of the sliding connection structure between the cylindrical buckle one and the extension rod one of the present application.

[0029] Figure 6 It is a schematic diagram of the rotating structure between the extension rod one and the cylindrical buckle two of the present application.

[0030] Figure 7 It is a schematic diagram of the sliding connection structure between the cylindrical buckle two and the extension rod two of the present application.

[0031] Figure 8 It is a schematic diagram of the structure between the extension rod one and the cylindrical buckle two of the present application.

[0032] Figure 9 It is a schematic diagram of the structure between the dial gauge and the cylindrical buckle three of the present application.

[0033] Figure 10 It is a schematic diagram of the structure between the extension rod two and the sleeve nut three of the present application.

[0034] In the figure: 1, operation table; 2, placing seat; 3, placing rack; 4, electromagnetic disc; 5, motor; 6, supporting boring bar; 7, cylindrical buckle one; 8, sleeve nut one; 9, extension rod one; 10, cylindrical buckle two; 11, sleeve nut two; 12, extension rod two; 13, cylindrical buckle three; 14, sleeve nut three; 15, dial gauge; 16, screw rod; 17, nut; 18, non-slip pad. DETAILED DESCRIPTION

[0035] In order to make the utility model purposes, technical solutions and advantages more clearly, the following will be further described in detail with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0036] As described in the background, first, the existing technology due to the way of connecting the dial gauge and the front connecting piece, further resulting in the dial gauge and the front connecting piece occupies the range is not convenient for testing smaller inner hole, further reducing the dial gauge for smaller inner hole test usability, second, the technical magnetic base and connecting rod buckle and knob itself has a certain volume, adsorbed on the outer circle of the main shaft, occupies the inner hole many radial calibration space, therefore, it is not convenient to stretch according to the distance of the workpiece of boring inner hole, and the traditional support boring bar and connecting piece connecting mode is not convenient to stretch, thereby occupying the calibration space of the device, thereby reducing the practicability and convenience of the device;

[0037] In order to solve this technical problem, the utility model provides a small and medium hole calibration rod.

[0038] Specifically, please refer to Figures 1-10 A small and medium hole calibration rod specifically comprises:

[0039] It comprises an operation table 1, one end of the top end of the operation table 1 is fixedly connected with a placing seat 2, the placing seat 2 is used for fixing an electromagnetic disc 4, provides a stable mounting position for the electromagnetic disc 4, so that the electromagnetic disc 4 can be firmly adsorbed on the operation table 1, ensures that the motor 5 and the subsequent device will not move or shake during the testing process, improves the stability of the testing, thereby stably supporting the motor 5 and the subsequent testing device, the other end of the top end of the operation table 1 is slidably connected with a placing rack 3, the other end inside the operation table 1 is assembled with an electric push rod, the output end of the electric push rod is fixedly connected with the placing rack 3, one end of the placing rack 3 is assembled with a workpiece, one end of the placing seat 2 is magnetically adsorbed with the electromagnetic disc 4, the outer side of the electromagnetic disc 4 is fixedly connected with the motor 5, one side inside the motor 5 is clamped with a support boring bar 6, the support boring bar 6 is used as a main component for connecting the motor 5 and the dial gauge 15, plays a supporting and power transmission role, one end of the support boring bar 6 is fixedly connected with a cylindrical buckle one 7, the inside of the cylindrical buckle one 7 is slidably connected with an extension rod one 9, the end, away from the support boring bar 6, of the extension rod one 9 is rotatably connected with a cylindrical buckle two 10, the end, away from the extension rod one 9, inside the cylindrical buckle two 10 is slidably connected with an extension rod two 12, the end, away from the cylindrical buckle two 10, of the extension rod two 12 is rotatably connected with a cylindrical buckle three 13, the inside of the cylindrical buckle three 13 is clamped with a dial gauge 15.

[0040] The utility model provides a kind of small and medium aperture school adjusts pole, by the workpiece of boring processing inner hole is assembled in the upper of placing frame 3, and then start electric push rod drives the workpiece of boring processing inner hole adjustment to the distance most suitable for inner hole test, then start electromagnetic disc 4 adsorption in the surface of installation seat 2, the position of adsorption is decided according to the position of the inner hole to be tested at this time, then rotate cylindrical buckle two 10 and cylindrical buckle three 13 adjust according to the position of the inner hole of workpiece, so that the inner hole of workpiece is tested by dial gauge 15, and extension rod one 9 and cylindrical buckle one 7 and cylindrical buckle two 10 and extension rod two 12 telescopic, so as to adjust according to the position of workpiece, convenient for workpiece to test record, greatly improve the practicality and convenience of device.

[0041] In order to enable the personnel in the technical field to better understand the utility model scheme, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings.

[0042] It should be noted that the embodiments and features and technical solutions in the embodiments in the utility model can be combined with each other without conflict.

[0043] It should be noted that: similar signs and letters indicate similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0044] Embodiment one

[0045] Please refer to Figures 1-5The utility model provides a small and medium -sized hole adjusting rod, including operation platform 1, one end of operation platform 1 top is fixed with the seat 2 of arrangement, the seat 2 is used for fixing the electromagnetism disc 4, provides a stable installation position for electromagnetism disc 4, makes electromagnetism disc 4 can be firmly adsorbed on operation platform 1, ensure that motor 5 and subsequent device do not move or sway during the testing process, improve the stability of testing, thereby stably support motor 5 and subsequent testing device, the other end of operation platform 1 top is slidably connected with the rack 3, and the other end in operation platform 1 is equipped with electric push rod, and the output end of electric push rod is fixed with the rack 3, and one end of rack 3 is equipped with workpiece, and one end of seat 2 is magnetically adsorbed with electromagnetism disc 4, and the outside of electromagnetism disc 4 is fixed with motor 5, and one side in motor 5 is clamped with support boring bar 6, and support boring bar 6 is as the main component of connecting motor 5 and dial gauge 15, plays the role of support and power transmission, one end of support boring bar 6 is fixed with cylindrical buckle one 7, the inside of cylindrical buckle one 7 is slidably connected with extension rod one 9, and one end of extension rod one 9 away from support boring bar 6 is rotatably connected with cylindrical buckle two 10, and one end of cylindrical buckle two 10 inside away from extension rod one 9 is slidably connected with extension rod two 12, and one end of extension rod two 12 away from cylindrical buckle two 10 is rotatably connected with cylindrical buckle three 13, and the inside of cylindrical buckle three 13 is clamped with dial gauge 15, and the accurate measurement of dial gauge 15 can obtain the accurate size and shape parameters of the inner hole of workpiece, provide important basis for subsequent processing and quality control, and the position of dial gauge 15 can be further adjusted through the telescopic adjustment of extension rod one 9, so that it can accurately contact the inner hole of workpiece, and the length and angle of extension rod two 12 can be conveniently adjusted through the adjustment of cylindrical buckle two 10 to adapt to the inner hole shape and position of different workpieces, and the movement or sway of dial gauge 15 during the testing process can be ensured through the fixing effect of cylindrical buckle three 13, improve the accuracy and stability of testing;

[0046] When in use, the workpiece of boring inner hole is assembled on the rack 3, then the electric push rod is started to drive the workpiece of boring inner hole to adjust to the distance most suitable for inner hole test, then the electromagnetism disc 4 is adsorbed on the surface of seat 2, at this time, the adsorbed position is determined according to the position of the inner hole to be tested, then the cylindrical buckle two 10 and cylindrical buckle three 13 are rotated to adjust according to the position of the inner hole of workpiece, so that the dial gauge 15 tests the inner hole of workpiece, and the extension rod one 9, cylindrical buckle one 7, cylindrical buckle two 10 and extension rod two 12 are telescopic, so as to adjust according to the position of workpiece, facilitate the workpiece to test record, greatly improve the practicability and convenience of the device;

[0047] The outer side of the cylindrical buckle 7 is provided with a positioning mechanism for adjusting the length of the extension rod 9, the positioning mechanism comprises a sleeve nut 8, the outer side of the cylindrical buckle 7 is threadedly connected with the sleeve nut 8, when the sleeve nut 8 is rotated, it will generate pressure on the cylindrical buckle 7, and then fix the position of the extension rod 9 through friction force, realize accurate adjustment and fixation of the length, the left end of the cylindrical buckle 7 is smaller in diameter than the right end, the inner side of the support boring bar 6 is slidably connected with the extension rod 9, the outer side of the extension rod 9 is fixed with anti-skid strips, the outer side of the anti-skid strips is slidably connected with the cylindrical buckle 7, which prevents the extension rod 9 from accidentally slipping off during sliding, and improves the stability and safety of adjustment.

[0048] Specifically, when the extension rod 9 needs to be adjusted in length, the sleeve nut 8 is rotated to move away from the extension rod 9 at this time, the extension rod 9 gradually generates pressure on the surface of the cylindrical buckle 7 at this time, and then the extension rod 9 is pulled to extend away from the cylindrical buckle 7, so as to drive the dial gauge 15 to adjust according to the inner hole of the workpiece.

[0049] The inner side of the cylindrical buckle 2 is provided with a limiting mechanism for adjusting the extension rod 2 to extend and retract, the limiting mechanism comprises a sleeve nut 11, the left end of the cylindrical buckle 2 is smaller in diameter than the right end, the outer side of the cylindrical buckle 2 is threadedly connected with the sleeve nut 11 close to the extension rod 2, when the sleeve nut 11 is rotated, it will generate pressure on the cylindrical buckle 2, and then fix the position of the extension rod 2 through friction force, realize accurate adjustment and fixation of the length, the outer side of the extension rod 2 is fixed with anti-skid pads 18, the outer side of the anti-skid pads 18 is slidably connected with the cylindrical buckle 2, which prevents the extension rod 2 from accidentally slipping off during sliding, and improves the stability and safety of adjustment.

[0050] Further, when the extension rod 2 needs to be adjusted, the sleeve nut 11 is rotated to move close to the cylindrical buckle 2 at this time, the extension rod 2 is pulled to extend away from the cylindrical buckle 2 at this time, so that the extension rod 2 drives the cylindrical buckle 3 and the dial gauge 15 to test the inner hole of the workpiece.

[0051] The inner side of the cylindrical buckle 3 is provided with a fixing mechanism for positioning the dial gauge 15, the left end of the cylindrical buckle 3 is smaller in diameter than the right end, the outer side of the cylindrical buckle 3 and the end away from the extension rod 2 are threadedly connected with a sleeve nut 14, by placing the dial gauge 15 in the inner side of the cylindrical buckle 3, and ensuring that the dial gauge 15 can be stably fixed in the inner side of the cylindrical buckle 3, at the same time, providing sufficient support force to resist vibration and impact during testing, then rotating the sleeve nut 14 to extrude the cylindrical buckle 3, and then the cylindrical buckle 3 assembles the dial gauge 15, so as to replace the dial gauge 15.

[0052] Embodiment two

[0053] Please refer to Figures 5-10 A small hole adjusting rod, the adjusting mechanism is arranged between the extension rod one 9 and the cylindrical buckle two 10 and the extension rod two 12 and the cylindrical buckle three 13, the adjusting mechanism comprises a screw rod 16 and a nut 17, the extension rod one 9 and the cylindrical buckle two 10 and the extension rod two 12 and the cylindrical buckle three 13 are rotatably connected with the screw rod 16, the screw rod 16 is threadedly connected with the nut 17 on both sides, the inner side of the extension rod one 9 and the two sides of the cylindrical buckle two 10 are fixed with anti-skid lines one, the inner side of the extension rod two 12 and the two sides of the cylindrical buckle two 10 are fixed with anti-skid lines two, the extension rod one 9 and the cylindrical buckle two 10 and the extension rod two 12 and the cylindrical buckle three 13 are adjusted by rotating, when the position of the workpiece inner hole tested by the dial gauge 15 is adjusted to the appropriate position, at this time, the two nuts 17 are respectively extruded on the extension rod one 9 and the extension rod two 12, so as to improve the stability of the adjusting device,

[0054] The nut 17 and the screw rod 16 are connected with the extension rod one 9, the cylindrical buckle two 10, the extension rod two 12 and the cylindrical buckle three 13 in the form of bolts, the cylindrical buckle one 7 is slidably connected with the extension rod one 9 and the cylindrical buckle two 10, and the support boring bar 6 is slidably connected with the motor 5, so that the device is convenient to disassemble and replace, the replacement and maintenance effect of the parts of the device is greatly improved, the maintenance cost of the device is reduced, and the use cost of the device is improved.

[0055] The use process of the small hole adjusting rod is as follows:

[0056] Working principle: in use, the workpiece for boring inner hole is assembled on the placing frame 3, then the electric push rod is started to drive the workpiece for boring inner hole to adjust to the most suitable distance for inner hole test, then the electromagnetic disc 4 is started to be adsorbed on the surface of the mounting seat 2, at this time, the adsorbed position is determined according to the position of the inner hole to be tested, the extension rod one 9 and the cylindrical buckle two 10 and the extension rod two 12 and the cylindrical buckle three 13 are adjusted by rotating, when the position of the workpiece inner hole tested by the dial gauge 15 is adjusted to the appropriate position, at this time, the two nuts 17 are respectively extruded on the extension rod one 9 and the extension rod two 12, so as to improve the stability of the adjusting device,

[0057] When the length of the position adjusting device of the workpiece inner hole needs to be adjusted, at this time, the extension rod two 12 is pulled to extend away from the cylindrical buckle two 10, and the extension rod one 9 is pulled to extend away from the cylindrical buckle one 7, then the cylindrical buckle one 7 and the cylindrical buckle two 10 are extruded by the sleeve nut one 8 and the sleeve nut two 11, so as to improve the stability of the extension rod one 9 and the extension rod two 12, and then the inner hole distance position of the workpiece is adjusted and tested.

[0058] The preferred embodiments disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.

Claims

1. A small-diameter orifice adjustment rod, characterized in that, The system includes an operating table (1), with a mounting base (2) fixed to one end of the top of the operating table (1) and a placement rack (3) slidably connected to the other end of the top of the operating table (1). A workpiece is mounted on one end of the placement rack (3), and a magnetic disk (4) is magnetically attached to one end of the mounting base (2). A motor (5) is fixed to the outside of the magnetic disk (4), and a support boring bar (6) is snapped into one side inside the motor (5). A cylindrical buckle (7) is fixed to one end of the support boring bar (6). The cylindrical buckle 1 (7) is internally slidably connected to an extension rod 1 (9). The end of the extension rod 1 (9) away from the support boring bar (6) is rotatably connected to a cylindrical buckle 2 (10). The end of the cylindrical buckle 2 (10) away from the extension rod 1 (9) is internally slidably connected to an extension rod 2 (12). The end of the extension rod 2 (12) away from the cylindrical buckle 2 (10) is rotatably connected to a cylindrical buckle 3 (13). The cylindrical buckle 3 (13) is internally engaged with a dial indicator (15).

2. The small-diameter hole adjustment rod according to claim 1, characterized in that, An electric push rod is installed at the other end of the operating table (1), and the output end of the electric push rod is fixed to the placement frame (3).

3. The small-diameter hole adjustment rod according to claim 2, characterized in that, The outer side of the cylindrical buckle 1 (7) is provided with a positioning mechanism for adjusting the length of the extension rod 1 (9). The positioning mechanism includes a sleeve nut 1 (8). The outer side of the cylindrical buckle 1 (7) is threaded with the sleeve nut 1 (8). The diameter of the left end of the cylindrical buckle 1 (7) is smaller than that of the right end. The extension rod 1 (9) is slidably connected inside the support boring rod (6).

4. The small-diameter hole adjustment rod according to claim 3, characterized in that, Anti-slip strips are fixed on the outer side of each extension rod (9), and the outer side of the anti-slip strips is slidably connected to the cylindrical buckle (7).

5. A small-diameter orifice adjustment rod according to claim 2, characterized in that, The cylindrical buckle 2 (10) is provided with a limiting mechanism for adjusting the extension rod 2 (12) to extend and retract. The limiting mechanism includes a sleeve nut 2 (11). The diameter of the left end of the cylindrical buckle 2 (10) is smaller than that of the right end. The sleeve nut 2 (11) is threadedly connected to the outer side of the cylindrical buckle 2 (10) near the extension rod 2 (12).

6. A small-diameter orifice adjustment rod according to claim 5, characterized in that, Anti-slip pads (18) are fixed on the outer side of each extension rod (12), and the outer side of the anti-slip pads (18) is slidably connected to the cylindrical buckle (10).

7. A small-diameter orifice adjustment rod according to claim 2, characterized in that, The cylindrical buckle three (13) is provided with a fixing mechanism for positioning the dial indicator (15). The left end of the cylindrical buckle three (13) has a smaller diameter than the right end. The outer end of the cylindrical buckle three (13) and the end away from the extension rod two (12) is threaded with a sleeve nut three (14).

8. A small-diameter orifice adjustment rod according to claim 7, characterized in that, An adjustment mechanism is provided between the extension rod one (9) and the cylindrical buckle two (10) and between the extension rod two (12) and the cylindrical buckle three (13). The adjustment mechanism includes a screw (16) and a nut (17). The extension rod one (9) and the cylindrical buckle two (10) and the extension rod two (12) and the cylindrical buckle three (13) are rotatably connected by a screw (16). Nuts (17) are threadedly connected to both sides of the screw (16).

9. A small-diameter orifice adjustment rod according to claim 8, characterized in that, The inner side of the extension rod (9) and both sides of the cylindrical buckle (10) are fixed with anti-slip texture.

10. A small-diameter hole adjustment rod according to claim 8, characterized in that, The inner side of the extension rod 2 (12) and both sides of the cylindrical buckle 2 (10) are fixed with anti-slip texture 2.

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