Coaxiality measuring tool

Abstract

The utility model provides a coaxiality measuring tool. The coaxiality measuring tool solves the problem that an existing coaxiality measuring tool cannot achieve in-situ measurement in a narrow space. According to the utility model, the lever indicator is fixed by the support column and the indicator frame together, the coaxiality of a measured product is measured by the positioning shaft and the lever indicator, and the distance for measurement at the top of the sensor shell is shorter, so that in-situ measurement can be conveniently carried out under the condition of narrow measurement space, and the device is suitable for wider measurement environments; compared with an original measurement mode, the measurement time is shortened, and the measurement efficiency is improved; according to the utility model, the positioning shaft is matched with the first bushing for positioning, and the measuring rod of the lever indicator is contacted with the inner wall of the second bushing to calculate the coaxiality, so that the device is simple to use, convenient to measure, large in measuring range, wide in application and high in universality; according to the utility model, the axial position of the positioning shaft is adjusted to enable the section of the measuring part which is most matched with the first bushing to be matched with the inner hole of the first bushing, thereby adapting to manufacturing errors of products.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation repair, and specifically relates to a coaxiality measuring tool. Background Art

[0002] In the field of aviation repair, some products often wear out due to long-term use of some precision fitting parts. During the repair process, in order to ensure that the product can restore its good working performance normally, it is necessary to check some fitting dimensions and geometric tolerances.

[0003] The structure of a certain type of product under test is as follows Figure 1 As shown, there are two coaxial bushings. During the repair process, in order to ensure the performance after the repair, the process requires measuring and checking the coaxiality of the ΦA hole of the first bushing 11 relative to the ΦB of the second bushing 12. However, due to the narrow measuring space at the top of the sensor housing 10 of the product to be measured, the existing coaxiality measuring tool cannot meet the demand for in-situ measurement in a narrow space. Therefore, the product to be measured must be disassembled for measurement, which increases the process, takes a long time to measure, and affects the measurement efficiency. Utility Model Content

[0004] The utility model aims to solve the problem of narrow measuring space and difficulty in in-situ measurement in the prior art, and provides a coaxiality measuring tool for this purpose.

[0005] To achieve the above purpose, the technical solution provided by the utility model is:

[0006] A coaxiality measuring tool is used for measuring the coaxiality of two coaxial bushings, and its special features include:

[0007] Positioning shafts, gauge stands, struts and lever dial indicators;

[0008] The positioning shaft is composed of a mounting portion, a measuring portion and a guide portion in the axial direction; the side surface of the measuring portion is a cone; the angle of the cone matches the measuring accuracy of the lever dial indicator; the diameter of the guide portion is smaller than the inner diameter of the first bushing;

[0009] The meter frame includes a pressing section and a clamping section, and the two sections are perpendicular to each other;

[0010] The support comprises a connecting ear and a mounting shaft; the support is combined with the mounting portion of the positioning shaft through the connecting ear, so that the support limits the axial position of the positioning shaft, and the positioning shaft can rotate circumferentially in the first bushing; the support is combined with the pressing section of the meter frame through the mounting shaft, so that the support limits the circumferential rotation of the meter frame, and the meter frame has a certain movable stroke in the axial direction of the mounting shaft;

[0011] The measuring needle of the lever dial indicator is coplanar with the axis of the first bushing; a clamping column is radially fixedly connected to the body of the lever dial indicator, and the clamping column is used to cooperate with the clamping section of the table frame; the measuring rod of the lever dial indicator contacts the inner wall of the second bushing.

[0012] Further,

[0013] Also includes a first set screw;

[0014] The mounting shaft is arranged at one end of the connecting ear;

[0015] A first mounting hole is provided at the other end of the connecting ear; a vertical first screw hole is provided on the wall of the first mounting hole;

[0016] The mounting portion of the positioning shaft is arranged in the first mounting hole; an annular groove is provided on the mounting portion; the first set screw passes through the first screw hole to connect the positioning shaft and the support, and is limited by the annular groove, while axially limiting the positioning shaft without affecting the circumferential rotation of the positioning shaft.

[0017] Further,

[0018] Also comprising a second set screw;

[0019] The body of the lever dial indicator is provided with a tenon perpendicular to the axis of the indicator; the clamping column is a cylinder, and one end of the clamping column is provided with a tenon groove matching the tenon; a second screw hole is provided on the axis of the clamping column; the second set screw passes through the second screw hole to press the clamping column onto the body of the lever dial indicator.

[0020] Further,

[0021] Also comprising a third set screw;

[0022] The mounting shaft is provided with a circle of annular steps; the annular steps divide the mounting shaft into two sections, and the side wall of the upper section of the mounting shaft is provided with an axial keyway; the length of the keyway is not greater than the length of the measuring part;

[0023] A second mounting hole is provided at the end of the clamping section of the meter frame, and a third screw hole is radially provided on the hole wall of the second mounting hole; the mounting shaft is arranged in the second mounting hole, and the meter frame is axially limited by the annular step; the third set screw passes through the third screw hole to clamp the meter frame on the mounting shaft, and is circumferentially limited by the keyway, so that the meter frame has a certain movable stroke in the axial direction of the mounting shaft.

[0024] Further,

[0025] Also included are fastening screws;

[0026] The end of the clamping section is provided with a third mounting hole, and the axis of the third mounting hole is parallel to the axis of the second mounting hole; the middle of the clamping section is provided with a clamping hole, and the axis of the clamping hole is parallel to the pressing section of the meter frame; the clamping section is provided with two clamping surfaces, and the axis of the clamping hole is parallel to the two clamping surfaces and is located between the two clamping surfaces; the clamping hole is used to clamp the clamping column to fix the meter frame on the lever dial indicator;

[0027] The third mounting hole is divided into two coaxial holes by two clamping surfaces, and the fastening screw can fasten the two coaxial holes so that the two clamping surfaces clamp the clamping column.

[0028] Further,

[0029] An elongated hole or elongated slot with an axis parallel to the clamping hole is provided on the clamping section of the meter frame and at one end away from the third mounting hole. The elongated hole or elongated slot is connected to the clamping hole through two clamping surfaces.

[0030] Further,

[0031] The tail of the guide portion of the positioning shaft is a coaxial positioning column, and the positioning column and the first bushing are clearance-matched;

[0032] The length of the guide portion does not exceed the inner hole depth of the first bushing.

[0033] Further,

[0034] The pressing section and the clamping section are L-shaped.

[0035] The advantages of the utility model are:

[0036] 1. The utility model adopts a positioning shaft and a lever dial indicator to measure the coaxiality of the measured product. The lever dial indicator is fixed by a support and a table frame. The space on the top of the sensor housing for measurement is narrow, which is convenient for in-situ measurement when the measuring space is small. It is suitable for a wider range of measurement environments. Compared with the original measurement method, it shortens the measurement time and improves the measurement efficiency.

[0037] 2. The utility model positions the first bushing by cooperating with the positioning shaft, and then calculates the coaxiality by contacting the inner wall of the second bushing with the measuring rod of the lever dial indicator. It is simple to use, convenient to measure, has a large measuring range, is widely used, and has strong versatility.

[0038] 3. The utility model adjusts the axial position of the positioning shaft to make the cross-section of the measuring part that best matches the inner hole of the first bushing cooperate with each other, thereby adapting to the manufacturing error of the product; by measuring multiple times and taking the average value, it avoids the accuracy of the measurement result being affected by defects in the local cross-section, reduces human measurement errors, and improves measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1It is a schematic diagram of the structure of the product under test;

[0040] Figure 2 It is the main view of the measuring tool structure;

[0041] Figure 3 It is the left view of the measuring tool structure;

[0042] Figure 4 It is a top view of the measuring tool structure;

[0043] Figure 5 It is a schematic diagram of the positioning shaft structure;

[0044] Figure 6 It is a cross-sectional view of the pillar structure;

[0045] Figure 7 It is an axonometric view of the pillar structure;

[0046] Figure 8 It is a schematic diagram of the set screw structure;

[0047] Fig. 9 It is a cross-sectional view of the clamp column structure;

[0048] Fig.10 It is a side view of the clamp column structure;

[0049] Fig.11 It is the axonometric drawing of the clamped column structure;

[0050] Fig.12 It is the front view of the table frame structure;

[0051] Fig.13 It is the left view of the table frame structure;

[0052] Fig.14 This is the axonometric drawing of the table frame structure.

[0053] In the figure: 1-positioning shaft; 2-pillar; 3-second set screw; 4-clamping column; 5-fastening screw; 6-meter frame; 7-third set screw; 8-first set screw; 9-lever dial indicator; 10-sensor housing; 11-first bushing; 12-second bushing;

[0054] 101-installation part; 102-measuring part; 103-guiding part; 104-positioning column;

[0055] 601-pressing section; 602-clamping section. DETAILED DESCRIPTION

[0056] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0057] like Figures 2 to 4 A coaxiality measuring tool as shown, comprising:

[0058] Support column 2, positioning shaft 1, meter frame 6, lever dial indicator 9, clamping column 4, first set screw 8, second set screw 3, third set screw 7 and fastening screw 5;

[0059] The support 2 is combined with the positioning shaft 1 so that the support 2 limits the axial position of the positioning shaft 1, and the positioning shaft 1 can rotate circumferentially in the first bushing 11; the support 2 is combined with the meter frame 6 so that the support 2 limits the circumferential rotation of the meter frame 6, and the meter frame 6 has a certain movable stroke in the axial direction of the mounting shaft; a clamping column 4 is radially fixed on the body of the lever dial indicator 9, and the lever dial indicator 9 is combined with the meter frame 6 through the clamping column 4, and the measuring rod of the lever dial indicator 9 can contact the inner wall of the second bushing 12. After adjusting the pointer of the lever dial indicator 9 to the "0" indication line, the meter frame 6 is rotated one circle in turn and the dial reading is recorded. By calculating the difference between the maximum reading and the minimum reading, the coaxiality of the first bushing 11 and the second bushing 12 is calculated.

[0060] like Figure 6 , Figure 7 As shown, the pillar 2 includes a connecting ear and a mounting shaft; the mounting shaft is arranged at one end of the connecting ear and is perpendicular to the plane of the connecting ear; a circle of annular steps is provided on the mounting shaft, and the annular steps divide the mounting shaft into two sections, and the side wall of the upper section of the mounting shaft is provided with an axial keyway; a first mounting hole is provided at the other end of the connecting ear, and the first mounting hole is perpendicular to the plane of the connecting ear; a vertical first screw hole is provided on the hole wall of the first mounting hole.

[0061] like Figure 5 As shown, the positioning shaft 1 is composed of a mounting portion 101, a measuring portion 102 and a guide portion 103 in sequence along the axial direction;

[0062] The mounting portion 101 is disposed in the first mounting hole; an annular groove is disposed on the mounting portion 101; the first set screw 8 passes through the first screw hole to connect the positioning shaft 1 and the support 2, and is limited by the annular groove, so as to limit the positioning shaft 1 in the axial direction without affecting the circumferential rotation of the positioning shaft 1;

[0063] Preferably, the first set screw 8 is a slotted flat-end set screw, the end of which is a cylindrical section and the tail is a threaded section; the diameter of the cylindrical section is slightly smaller than that of the threaded section, so that the cylindrical section is stuck in the annular groove, ensuring that the positioning shaft 1 can rotate freely while limiting the axial movement of the positioning shaft 1; the threaded section at the tail cooperates with the first screw hole to play a tightening role.

[0064] The side surface of the measuring part 102 is a conical surface, and the diameter range of the conical surface includes the inner diameter size of the first bushing 11, and the length of the measuring part 102 is not less than the length of the keyway; the measuring personnel adjust the axial position of the positioning shaft 1 so that the cross section of the measuring part 102 that best matches the first bushing 11 matches the inner hole of the first bushing 11, thereby eliminating the matching clearance error, adapting to the manufacturing error of the product, reducing the human measurement error, and improving the measurement accuracy; the angle of the conical surface matches the measurement accuracy of the lever dial indicator 9, so that the coaxiality measuring tool can measure the inner diameter of the first bushing 11 with high accuracy, and the diameter range of the conical surface will not be too large;

[0065] The taper of the conical surface of this embodiment is less than or equal to 1:50.

[0066] The diameter of the guide portion 103 is smaller than the inner diameter of the first bushing 11, and the length of the guide portion 103 does not exceed the inner hole depth of the first bushing 11;

[0067] Preferably, the tail of the guide portion 103 is a positioning column 104, and the positioning column 104 is clearance-matched with the first bushing 11, so that the positioning shaft 1 is fixed by the positioning column 104 and the measuring portion 102 during measurement, thereby preventing the positioning shaft 1 from shaking during measurement;

[0068] like Figures 9-11 As shown, the clamping column 4 is a cylinder, and one end of the clamping column 4 is provided with a dovetail groove; Figure 2 As shown, the measuring needle of the lever dial indicator 9 is coplanar with the axis of the first bushing, and the body of the lever dial indicator 9 is provided with a dovetail tenon perpendicular to the axis of the meter; the clamping column 4 is horizontally inserted and assembled on the dovetail tenon of the meter body, and the dovetail tenon limits the axial movement of the clamping column 4 through the dovetail tenon groove; a second screw hole is provided on the axis of the clamping column 4; the second tightening screw 3 passes through the second screw hole to press the clamping column 4 onto the body of the lever dial indicator 9.

[0069] like Figures 12-14 As shown, the meter frame 6 includes a pressing section 601 and a clamping section 602, the two sections are perpendicular to each other and are L-shaped;

[0070] A second mounting hole is provided at the end of the pressing section 601, and a third screw hole is radially provided on the wall of the second mounting hole; the mounting shaft is arranged in the second mounting hole, and the meter frame 6 is axially limited by the annular step; the third set screw 7 passes through the third screw hole to press the meter frame 6 on the mounting shaft, and the meter frame 6 is combined with the pillar 2, and is circumferentially limited by the keyway, while limiting the circumferential rotation of the meter frame 6, ensuring that the meter frame 6 has a certain movable stroke in the axial direction of the mounting shaft, so that the meter frame 6 is always perpendicular to the positioning shaft 1;

[0071] A third mounting hole is provided at the end of the clamping section 602, and the axis of the third mounting hole is parallel to the axis of the second mounting hole; a clamping hole is provided in the middle of the clamping section 602, and the axis of the clamping hole is parallel to the pressing section 601; the clamping section 602 is provided with two clamping surfaces, and the axis of the clamping hole is parallel to the two clamping surfaces and is located between the two clamping surfaces; the clamping hole is used to clamp the clamping column 4, and the meter frame 6 is fixed on the lever dial indicator 9 through the clamping hole and the clamping column 4;

[0072] The third mounting hole is divided into two coaxial holes by two clamping surfaces, including a light hole (screw through hole) and a threaded hole, and the head of the fastening screw is larger than the light hole; the fastening screw 5 passes through the two coaxial holes, and the two clamping surfaces clamp the clamping column 4 through the fastening screw head and the threaded hole;

[0073] An extended hole or an extended slot with an axis parallel to the clamping hole is provided on the clamping section 602 and at one end away from the third mounting hole. The extended hole or the extended slot is connected to the clamping hole through two clamping surfaces, so that the two clamping surfaces cooperate with the tightening force of the fastening screw to achieve reliable clamping of the clamping column 4; since the clamping force of the clamping hole is achieved by tightening the two clamping surfaces by the fastening screw 5 on one side, the clamping hole undergoes elastic deformation; therefore, the length of the clamping surface is extended by opening a groove or a hole to the other side, which will cause the clamping force of the clamping hole to decrease; conversely, if there is no groove or hole, the clamping surface is shorter, and the clamping force required for the clamping hole becomes larger, resulting in the fastening screw 5 being unable to tighten the two clamping surfaces, resulting in the clamping hole being unable to reliably clamp the clamping column 4.

[0074] The structures of the second set screw 3 and the third set screw 7 are as follows: Figure 8 shown.

[0075] Working principle of using a coaxiality measuring tool to measure the coaxiality of ΦA of the first bushing 11 relative to ΦB of the second bushing 12:

[0076] 1. As Figure 2 As shown, insert the positioning shaft 1 into the ΦA of the first bushing 11, first adjust the axial position of the positioning shaft 1 so that the measuring part 102 matches with the ΦA of the first bushing 11, and then adjust the measuring rod of the lever dial indicator 9 to contact with the hole wall of the second bushing 12ΦB so that the measuring rod has a certain degree of compression;

[0077] 2. If Figure 4As shown, after adjusting the pointer of the lever dial indicator 9 to the "0" indication line, rotate the meter frame 6 one circle and record the dial reading, and calculate the coaxiality of the measuring part 102 of the positioning shaft 1 by calculating the difference between the maximum reading and the minimum reading.

[0078] 3. Re-adjust the contact position between the measuring rod of the lever dial indicator 9 and the hole wall of the second bushing 12ΦB by adjusting the second set screw 3 or the third set screw 7, and then repeat the measurement operations of steps 2 and 3; by measuring multiple times and taking the average value, the accuracy of the measurement is improved to avoid affecting the accuracy of the measurement results due to defects in the local section.

[0079] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. A coaxiality measuring tool for measuring the coaxiality of two coaxial bushings, characterized in that: include: Positioning shafts, gauge stands, struts and lever dial indicators; The positioning shaft is composed of a mounting portion, a measuring portion and a guide portion in the axial direction; the side surface of the measuring portion is a cone; the angle of the cone matches the measuring accuracy of the lever dial indicator; the diameter of the guide portion is smaller than the inner diameter of the first bushing; The meter frame includes a pressing section and a clamping section, and the two sections are perpendicular to each other; The support comprises a connecting ear and a mounting shaft; the support is combined with the mounting portion of the positioning shaft through the connecting ear, so that the support limits the axial position of the positioning shaft, and the positioning shaft can rotate circumferentially in the first bushing; the support is combined with the pressing section of the meter frame through the mounting shaft, so that the support limits the circumferential rotation of the meter frame, and the meter frame has a certain movable stroke in the axial direction of the mounting shaft; The measuring needle of the lever dial indicator is coplanar with the axis of the first bushing; a clamping column is radially fixedly connected to the body of the lever dial indicator, and the clamping column is used to cooperate with the clamping section of the table frame; the measuring rod of the lever dial indicator contacts the inner wall of the second bushing.

2. A coaxiality measuring tool according to claim 1, characterized in that: Also includes a first set screw; The mounting shaft is arranged at one end of the connecting ear; A first mounting hole is provided at the other end of the connecting ear; a vertical first screw hole is provided on the wall of the first mounting hole; The mounting portion of the positioning shaft is arranged in the first mounting hole; an annular groove is provided on the mounting portion; the first set screw passes through the first screw hole to connect the positioning shaft and the support, and is limited by the annular groove, while axially limiting the positioning shaft without affecting the circumferential rotation of the positioning shaft.

3. A coaxiality measuring tool according to claim 2, characterized in that: Also comprising a second set screw; The body of the lever dial indicator is provided with a tenon perpendicular to the axis of the indicator; the clamping column is a cylinder, and one end of the clamping column is provided with a tenon groove matching the tenon; a second screw hole is provided on the axis of the clamping column; the second set screw passes through the second screw hole to press the clamping column onto the body of the lever dial indicator.

4. A coaxiality measuring tool according to claim 3, characterized in that: Also comprising a third set screw; The mounting shaft is provided with a circle of annular steps; the annular steps divide the mounting shaft into two sections, and the side wall of the upper section of the mounting shaft is provided with an axial keyway; the length of the keyway is not greater than the length of the measuring part; A second mounting hole is provided at the end of the clamping section of the meter frame, and a third screw hole is radially provided on the hole wall of the second mounting hole; the mounting shaft is arranged in the second mounting hole, and the meter frame is axially limited by the annular step; the third set screw passes through the third screw hole to clamp the meter frame on the mounting shaft, and is circumferentially limited by the keyway, so that the meter frame has a certain movable stroke in the axial direction of the mounting shaft.

5. A coaxiality measuring tool according to claim 4, characterized in that: Also included are fastening screws; The end of the clamping section is provided with a third mounting hole, and the axis of the third mounting hole is parallel to the axis of the second mounting hole; the middle of the clamping section is provided with a clamping hole, and the axis of the clamping hole is parallel to the pressing section of the meter frame; the clamping section is provided with two clamping surfaces, and the axis of the clamping hole is parallel to the two clamping surfaces and is located between the two clamping surfaces; the clamping hole is used to clamp the clamping column to fix the meter frame on the lever dial indicator; The third mounting hole is divided into two coaxial holes by two clamping surfaces, and the fastening screw can fasten the two coaxial holes so that the two clamping surfaces clamp the clamping column.

6. A coaxiality measuring tool according to claim 5, characterized in that: An elongated hole or elongated slot with an axis parallel to the clamping hole is provided on the clamping section of the meter frame and at one end away from the third mounting hole. The elongated hole or elongated slot is connected to the clamping hole through two clamping surfaces.

7. A coaxiality measuring tool according to claim 1, characterized in that: The tail of the guide portion of the positioning shaft is a coaxial positioning column, and the positioning column and the first bushing are clearance-matched; The length of the guide portion does not exceed the inner hole depth of the first bushing.

8. A coaxiality measuring tool according to claim 1, characterized in that: The pressing section and the clamping section are L-shaped.

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