Hole depth measuring tool

Abstract

The utility model discloses a hole depth measuring tool which comprises a measuring tool base, a supporting column is vertically arranged on the measuring tool base, a horizontally-arranged measuring tool plate is installed on the top of the supporting column, a mandrel and a limiting sleeve are installed on the measuring tool plate in a spaced mode, a correction ring is sleeved on the outer surface of the mandrel, and the limiting sleeve is sleeved on the outer surface of the correction ring. A limiting groove extending in the axial direction of the mandrel is formed in the mandrel in a penetrating mode, a first measuring head channel is formed between the limiting groove and the inner hole of the calibration ring in the radial direction, a second measuring head channel communicated with the first measuring head channel is formed in the center of the limiting sleeve, a dial indicator is installed on the limiting sleeve, and a measuring probe is installed at the end of the dial indicator. And the measuring probe sequentially passes through the second measuring head channel and the first measuring head channel to reach the workpiece to be measured. By arranging the structures such as the mandrel and the calibration ring, the to-be-measured workpiece can be calibrated, the hole depth of the large-diameter hole of the to-be-measured workpiece can be accurately and rapidly measured, and the detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection of aircraft parts and components, in particular to a hole depth measuring tool. Background Art

[0002] The shell base (i.e., the workpiece to be measured) on the aircraft is a key component for installing shells. The shell base is a cylindrical structure, and three loading channels are evenly distributed around its center on the end face. The loading channels are stepped holes, including large diameter holes, medium diameter holes, and small diameter holes. The diameter of the large diameter hole is larger than the medium diameter hole, and the diameter of the medium diameter hole is larger than the small diameter hole. Therefore, the processing of the stepped holes must be strictly controlled, especially the inner cavity processing depth of the large diameter hole must be strictly controlled. If the hole depth of the large diameter hole deviates and causes processing failure, it will affect the distance of the aircraft to launch the shell, and then affect the accuracy of the launch. Therefore, how to accurately detect the depth of the large diameter hole is very important. However, since the shell base is a cylindrical structure, and three shell insertion holes are evenly distributed along its axial direction on its end face, it is inconvenient to locate when measuring the large diameter hole of the shell insertion hole, and each shell insertion hole needs to be clamped once when measuring, which is prone to measurement deviation and inaccurate measurement. In the prior art, ordinary dial indicators or vernier calipers are used to detect the inner cavity depth of large diameter holes. Since the aperture difference of the step hole is small, displacement difference is easily generated during measurement, resulting in inaccurate measurement, affecting the product quality and detection efficiency of the shell base. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a hole depth measuring tool that can calibrate the workpiece to be measured, accurately and quickly measure the hole depth of the large diameter hole of the workpiece to be measured, and improve the accuracy of detection.

[0004] In order to solve the above technical problems, the utility model includes a measuring tool base, and its structural feature is that a pillar is vertically arranged on the measuring tool base, a horizontally arranged measuring tool plate is installed on the top of the pillar, a core shaft and a limit sleeve are installed on the measuring tool plate, a calibration ring is sleeved on the outer surface of the core shaft, a limit groove extending along the axial direction of the core shaft is penetrated, a first probe channel is formed between the limit groove and the inner hole radial direction of the calibration ring, a second probe channel connected to the first probe channel is opened at the center of the limit sleeve, a dial indicator is installed on the limit sleeve, a measuring probe is installed on the end of the dial indicator, and the measuring probe passes through the second probe channel and the first probe channel in sequence to extend to the workpiece to be measured. After adopting the above structure, when using, first, place the gauge base on the work platform, install the pillar on the gauge base, and install the gauge plate on the top of the pillar; then, install the mandrel and the limit sleeve on the gauge plate respectively, and install the dial indicator on the limit sleeve; finally, put the calibration ring on the mandrel, place the workpiece to be measured on the calibration ring, and the measuring probe of the dial indicator passes through the second probe channel and the first probe channel to the workpiece to be measured in turn to detect the hole depth of the workpiece to be measured. By setting a horizontally arranged gauge plate as a detection base, the mandrel and the limit sleeve installed thereon are located in the vertical direction to ensure the accuracy of subsequent detection results; by setting a calibration ring sleeved on the outer surface of the mandrel, the workpiece to be detected is calibrated, and a first probe channel is formed between the calibration ring and the limit groove to ensure that the measuring probe passes through the first probe channel smoothly; by setting a second probe channel connected to the first probe channel, the measuring probe always passes through the first probe channel and the second probe channel to prevent it from offsetting during operation and ensure accurate measurement. The utility model can calibrate the workpiece to be measured, accurately and quickly measure the hole depth of the large-diameter hole of the workpiece to be measured, and improves the accuracy of detection.

[0005] Preferably, a first positioning hole is provided at the center of the mandrel, a second positioning hole is provided on the bottom surface of the first mounting hole, a first screw is inserted into the first positioning hole, and the first screw passes through the first positioning hole and the second positioning hole in sequence to fix the mandrel on the gauge plate, so as to ensure that the mandrel is fixed and prevent deviation during measurement.

[0006] Preferably, the measuring plate is provided with a first mounting hole and a second mounting hole which are spaced apart from each other, the first mounting hole being arranged at the center of the measuring plate, and the mandrel being inserted into the first mounting hole; the center line of the mandrel is made to coincide with the center line of the measuring plate to avoid tilting due to unbalanced weight; the limiting sleeve comprises a connecting sleeve inserted into the second mounting hole and a fixing sleeve connected to the connecting sleeve, and the dial indicator is fixed on the fixing sleeve; ensure that the dial indicator is fixed to prevent it from displacement.

[0007] Preferably, the measuring probe comprises a measuring seat mounted on the end of the dial indicator, a measuring head is mounted on the measuring seat, and the diameter of the measuring head gradually decreases from the end surface close to the measuring seat to the other end, so as to facilitate the measuring head to stably pass through the first measuring head channel after passing through the second measuring head channel, and prevent the measuring head from deviating and causing inaccurate measurement results.

[0008] Preferably, the limiting groove is set as an open groove and its diameter matches the large diameter end of the probe, so as to ensure that the probe stably passes through the first probe channel and avoid deviation during measurement.

[0009] Preferably, the small diameter end face of the probe is set as an arc surface and matches the end face of the stepped hole of the workpiece to be measured, so as to ensure that the small diameter end of the probe is against the stepped hole of the workpiece to be measured during measurement.

[0010] The utility model provides a horizontally arranged gauge plate as a detection base, so that the mandrel and the limit sleeve installed thereon are located in a vertical direction, thereby ensuring the accuracy of subsequent detection results; a calibration ring is provided on the outer surface of the mandrel to calibrate the workpiece to be detected, and a first probe channel is formed between the calibration ring and the limit groove, thereby ensuring that the measuring probe passes through the first probe channel smoothly; a second probe channel connected to the first probe channel is provided, so that the measuring probe always passes through the first probe channel and the second probe channel, thereby preventing the measuring probe from being offset during operation, thereby ensuring accurate measurement; a first positioning hole and a second positioning hole are provided at the center of the mandrel, and the mandrel is fixed at the center with a first screw. The measuring tool plate is provided to prevent the deviation during measurement; the dial indicator is fixed on the limit sleeve by setting a limit sleeve to prevent the deviation during measurement; the diameter of the probe is set to gradually decrease from the end face close to the measuring seat to the other end, so as to facilitate the probe to stably pass through the first probe channel after passing through the second probe channel, thereby preventing the probe from deviating and causing inaccurate measurement results; the limit groove is set as an open groove and its diameter matches the large diameter end of the probe to ensure that the probe stably passes through the first probe channel to avoid deviation during measurement; the small diameter end face of the probe is set as an arc surface and matches the end face of the step hole of the workpiece to be measured to ensure that the small diameter end of the probe is against the step hole of the workpiece to be measured during measurement. The utility model can calibrate the workpiece to be measured, accurately and quickly measure the hole depth of the large diameter hole of the workpiece to be measured, and improve the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings that constitute part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure of the measuring base in a top view of the utility model;

[0014] Figure 3 for Figure 2 A schematic structural diagram of a cross-section of AA;

[0015] Figure 4 It is a schematic diagram of the structure of the pillar of the utility model from a top view;

[0016] Figure 5 for Figure 4 A schematic structural diagram of a BB cross-section;

[0017] Figure 6 It is a schematic diagram of the structure of the measuring tool plate of the utility model from a top view;

[0018] Figure 7 for Figure 6 A schematic diagram of the structure of the CC section view;

[0019] Figure 8 It is a schematic diagram of the structure of the mandrel of the utility model from a top view;

[0020] Fig. 9 for Figure 8 A schematic diagram of the structure of the DD cross-section;

[0021] Fig.10 This is a schematic diagram of the structure of the limit sleeve of the utility model;

[0022] Fig.11 This is a schematic diagram of the structure of the measuring probe of the utility model from a top view;

[0023] Fig.12 for Fig.11 Schematic diagram of the enlarged structure of E;

[0024] Fig.13 It is a schematic diagram of the structure of the workpiece to be measured from a top view according to the utility model;

[0025] Fig.14 for Fig.13 Schematic diagram of the FF cross-section structure.

[0026] In the figure: 1- measuring tool base, 2- pillar, 3- measuring tool plate, 301- first mounting hole, 302- second mounting hole, 4- spindle, 401- positioning shaft, 402- positioning end cover, 4021- limiting groove, 5- limiting sleeve, 501- connecting sleeve, 502- fixing sleeve, 6- calibration ring, 7- dial indicator, 701- measuring probe, 7011- measuring seat, 7012- measuring head. DETAILED DESCRIPTION

[0027] In order to make the technical personnel in this field better understand the present application scheme, the following will be combined with the attached Figure 1-14 , a clear and complete description of the technical solutions in the embodiments of the utility model is given.

[0028] An embodiment is now used to describe the above scheme in detail. For the convenience of description, Figure 1 The up and down direction is set to the vertical direction, and the left and right direction is set to the horizontal direction. Figure 2 The up-down direction is set to the front-back direction.

[0029] A hole depth gauge comprises a gauge base 1, a pillar 2 is vertically arranged on the gauge base 1, a horizontally arranged gauge plate 3 is mounted on the top of the pillar 2, and a core shaft 4 and a limit sleeve 5 are installed on the gauge plate 3. Among them, the base is set as a square structure, on which two symmetrical and spaced-apart stepped first fastening holes and second fastening holes are provided, the first fastening holes and the second fastening holes are spaced-apart along the front-to-back direction of the measuring tool base 1, the large diameter hole of the stepped hole is located at the bottom, and the small diameter hole is located at the top, and each stepped hole is penetrated with a first hexagon socket cylindrical head screw; the pillar 2 is set as a cylindrical structure, and two first threaded holes and second threaded holes are provided on its bottom surface, which are coaxially arranged with the first fastening hole and the second fastening hole, respectively, and the first threaded hole and the second threaded hole are symmetrically arranged along the center, so as to stably install the pillar 2 on the measuring tool base 1 to prevent it from being skewed, and to ensure that it is stable and firm after installation, so as to ensure accurate subsequent detection; two third threaded holes and fourth threaded holes are provided on the top surface of the pillar 2, which are coaxially arranged with the first threaded hole and the second threaded hole, respectively, and each of the above-mentioned first hexagon socket cylindrical head screws passes through the first fastening hole and the second fastening hole respectively and is threadedly connected in the corresponding first threaded hole and the second threaded hole, so as to ensure that the measuring tool base 1 and the pillar 2 are firmly connected. In addition, the measuring plate 3 is provided with a third fastening hole and a fourth fastening hole which are coaxially arranged with the third threaded hole and the fourth threaded hole on the top surface of the pillar 2, and the third fastening hole and the fourth fastening hole are symmetrically arranged, and the third fastening hole and the fourth fastening hole are respectively penetrated by a second hexagon socket head screw, and each second hexagon socket head screw passes through the third fastening hole or the fourth fastening hole and is threadedly connected to the corresponding third threaded hole and the fourth threaded hole; ensure that the measuring plate 3 is flat and firmly installed with the pillar 2 to avoid the measuring plate 3 from being skewed, so as to ensure the accuracy of subsequent detection. The above-mentioned measuring plate 3 is also provided with a first mounting hole 301 and a second mounting hole 302 which are spaced apart. The center line of the first mounting hole 301 and the second mounting hole 302 is perpendicular to the center line between the third fastening hole and the fourth fastening hole to ensure safety and stability after installation without deviation. The first mounting hole 301 is configured as a stepped mounting hole and is arranged at the center of the measuring plate 3. The core shaft 4 is inserted into the first mounting hole 301 so that the center line of the core shaft 4 coincides with the center line of the measuring plate 3 to avoid tilting due to unbalanced weight, so as to ensure accurate subsequent detection.

[0030] A first positioning hole is provided at the center of the mandrel 4, and a second positioning hole is provided on the bottom surface of the first mounting hole 301 on the measuring plate 3. A first screw is inserted into the first positioning hole, and the first screw passes through the first positioning hole and the second positioning hole in sequence to fix the mandrel 4 on the measuring plate 3; to ensure that the mandrel 4 is fixed to prevent displacement during measurement. A calibration ring 6 is sleeved on the outer surface of the mandrel 4; wherein the mandrel 4 includes a positioning shaft 401 inserted into a small diameter hole of the first mounting hole 301 and a positioning end cap 402 inserted into a large diameter hole of the first mounting hole 301; the calibration ring 6 is a disc-shaped structure, and a calibration hole is provided at the center thereof to be sleeved on the outer surface of the mandrel 4. The size of the calibration hole matches the outer surface of the mandrel 4, and the diameter of the calibration hole is slightly larger than the diameter of the mandrel 4, so as to facilitate the calibration ring 6 to be sleeved on the outside of the mandrel 4, and the calibration ring 6 The thickness is greater than the thickness of the positioning end cap 402 of the mandrel 4 to avoid damaging the mandrel 4 during measurement. For example, the outer diameter of the positioning end cap 402 of the mandrel 4 is not greater than 19 mm and the thickness is 3.6. The diameter of the calibration hole on the calibration ring 6 is 19.2 mm, and the thickness of the calibration ring 6 is not greater than 4.01 mm. That is, when the calibration ring 6 is sleeved on the outside of the positioning end cap 402 of the mandrel 4, the top surface of the calibration ring 6 of the mandrel 4 is higher than the top surface of the positioning end cap 402, and the calibration ring 6 can move to facilitate measurement. The mandrel 4 is also penetrated by a limiting groove 4021 extending along its axial direction, that is, the limiting groove 4021 extends axially along the positioning end cap 402 of the mandrel 4 and penetrates the positioning end cap 402. A first probe channel is formed between the limiting groove 4021 and the inner hole radial direction of the calibration ring 6. A second probe channel connected to the first probe channel is opened at the center of the limiting sleeve 5 to ensure accurate subsequent detection.

[0031] The above-mentioned limit sleeve 5 is installed with a dial indicator 7, that is, the limit sleeve 5 includes a connecting sleeve 501 installed in the second mounting hole 302 and a fixing sleeve 502 connected to the connecting sleeve 501, and the dial indicator 7 is fixed on the fixing sleeve 502; ensure that the dial indicator 7 is fixed to prevent it from displacement. A measuring probe 701 is installed at the end of the dial indicator 7, and the measuring probe 701 passes through the second probe channel and the first probe channel in sequence to the workpiece to be measured. The measuring probe 701 includes a measuring seat 7011 installed at the end of the dial indicator 7, and a probe 7012 is installed on the measuring seat 7011. The diameter of the probe 7012 gradually decreases from the end face close to the measuring seat 7011 to the other end. This is to facilitate the probe 7012 to pass through the first probe channel smoothly after passing through the second probe channel, and prevent the probe 7012 from being offset and causing inaccurate measurement results. The small diameter end face of the probe 7012 is set as an arc surface and matches the end face of the step hole of the workpiece to be measured. The stopper groove 4021 on the mandrel 4 is set as an open groove and its diameter matches the large diameter end of the probe 7012 to ensure that the probe 7012 stably passes through the first probe channel to avoid deviation during measurement.

[0032] When in use, first, place the measuring tool base 1 on the work platform, install the pillar 2 on the measuring tool base 1, and install the measuring tool plate 3 on the top of the pillar 2; then, install the core shaft 4 and the limit sleeve 5 on the measuring tool plate 3 respectively, and install the dial indicator 7 on the limit sleeve 5; finally, put the calibration ring 6 on the core shaft 4, place the workpiece to be measured on the calibration ring 6, and the measuring probe 701 of the dial indicator 7 passes through the second probe channel and the first probe channel in turn to the workpiece to be measured to detect the hole depth of the workpiece to be measured. The utility model sets a horizontally arranged gauge plate 3 as a detection base, so that the core shaft 4 and the limit sleeve 5 installed thereon are located in the vertical direction, thereby ensuring the accuracy of subsequent detection results; sets a calibration ring 6 sleeved on the outer surface of the core shaft 4 to calibrate the workpiece to be detected, and forms a first probe channel between the calibration ring 6 and the limit groove 4021, thereby ensuring that the measuring probe 701 passes through the first probe channel smoothly; sets a second probe channel connected to the first probe channel, thereby ensuring that the measuring probe 701 always passes through the first probe channel and the second probe channel, thereby preventing the measuring probe 701 from being offset during operation, thereby ensuring accurate measurement; sets a first positioning hole and a second positioning hole at the center of the core shaft 4, and fixes the core shaft 4 on the gauge plate 3 with a first screw, thereby preventing the measuring probe 701 from being offset during measurement. The invention provides a method for preventing the stylus 7012 from being deviated from the measuring head 7012 by setting the limit sleeve 5 to fix the dial indicator 7 on the limit sleeve 5 to prevent the stylus 7012 from being deviated during measurement; the diameter of the stylus 7012 is gradually reduced from the end face close to the measuring seat 7011 to the other end, so as to facilitate the stylus 7012 to stably pass through the first measuring head channel after passing through the second measuring head channel, thereby preventing the stylus 7012 from being deviated and causing inaccurate measurement results; the limit groove 4021 is set as an open groove and its diameter matches the large diameter end of the stylus 7012 to ensure that the stylus 7012 stably passes through the first measuring head channel to avoid the stylus 7012 from being deviated during measurement; the small diameter end face of the stylus 7012 is set as an arc surface and matches the end face of the step hole of the workpiece to be measured to ensure that the small diameter end of the stylus 7012 is against the step hole of the workpiece to be measured during measurement. The utility model can calibrate the workpiece to be measured, accurately and quickly measure the hole depth of the large diameter hole of the workpiece to be measured, and improve the accuracy of detection.

[0033] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A hole depth gauge, comprising a gauge base (1), characterized in that: The measuring tool base (1) is vertically provided with a pillar (2), the top of the pillar (2) is provided with a horizontally provided measuring tool plate (3), the measuring tool plate (3) is provided with a core shaft (4) and a limit sleeve (5) arranged at intervals, the outer surface of the core shaft (4) is sleeved with a calibration ring (6), the core shaft (4) is penetrated with a limit groove (4021) extending along its axial direction, a first probe channel is formed between the limit groove (4021) and the inner hole radial direction of the calibration ring (6), a second probe channel connected to the first probe channel is opened at the center of the limit sleeve (5), a dial indicator (7) is provided on the limit sleeve (5), a measuring probe (701) is provided at the end of the dial indicator (7), and the measuring probe (701) passes through the second probe channel and the first probe channel in sequence and extends to a workpiece to be measured.

2. The hole depth gauge according to claim 1, characterized in that: The gauge plate (3) is provided with a first mounting hole (301) and a second mounting hole (302) which are arranged at intervals, a first positioning hole is provided at the center of the mandrel (4), a second positioning hole is also provided on the bottom surface of the first mounting hole (301), a first screw is inserted into the first positioning hole, and the first screw passes through the first positioning hole and the second positioning hole in sequence to fix the mandrel (4) on the gauge plate (3).

3. The hole depth gauge according to claim 2, characterized in that: The first mounting hole (301) is arranged at the center of the measuring tool plate (3), and the core shaft (4) is inserted into the first mounting hole (301); the limiting sleeve (5) comprises a connecting sleeve (501) inserted into the second mounting hole (302) and a fixing sleeve (502) connected to the connecting sleeve (501), and the dial indicator (7) is fixed on the fixing sleeve (502).

4. The hole depth gauge according to claim 1, characterized in that: The measuring probe (701) comprises a measuring seat (7011) mounted on the end of a dial indicator (7), a measuring head (7012) being mounted on the measuring seat (7011), and a diameter of the measuring head (7012) gradually decreasing from an end face close to the measuring seat (7011) towards the other end.

5. The hole depth gauge according to claim 4, characterized in that: The limiting groove (4021) is configured as an open groove and its diameter matches the large diameter end of the measuring head (7012).

6. The hole depth gauge according to claim 5, characterized in that: The small diameter end face of the probe (7012) is set as a curved surface and matches the end face of the stepped hole of the workpiece to be measured.

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