A device for detecting the width of a circumferential ring groove in a cartridge

Abstract

The application provides a device for detecting the width of a circumferential ring groove in a casing, comprising a base plate, a support, a table, a lever and a measuring rod, the support is provided with a central hole in the axial direction, the outer cylindrical surface of the support is provided with an oblong hole extending to the central hole, and the measuring rod is movably arranged in the central hole of the support; the base plate is a left-right symmetrical fan-shaped structure and is detachably and vertically arranged at one end of the support and in contact with one end surface to be measured; the table is detachably arranged on the symmetrical center line of the side surface of the base plate; the middle part of the lever is hingedly arranged on the table through a shaft pin, the measuring surface of one end of the lever is in contact with the surface to be measured of the circumferential ring groove in the casing during measurement, the other end of the lever extends into the central hole of the support through the oblong hole and is in contact with one end of the measuring rod, and the other end of the measuring rod is in contact with the contact of the measuring table. The application has the advantages of simple structure, low cost, convenient and fast operation, stable and reliable measurement result and satisfaction of the requirement of batch detection of parts in the production site.

Description

Technical Field

[0001] This application relates to the field of aero-engine processing technology, and in particular, to a device for detecting the width of the circumferential groove inside a casing. Background Technology

[0002] Axial flow casing assembly ( Figure 1 The engine casing is a core component, with multiple layers of annular grooves distributed around its circumference inside, used for positioning the stator blade disk. Figure 2 Each annular groove has two channels. The diameters of the raised edges of the channels near the center are not aligned, resulting in a misalignment. The dimensions between the end faces of the raised edges are (…). Figure 1 Sizes 23mm and 27mm) with stator blade disk ( Figure 2 There is a need for high precision machining, as these processes require close cooperation. Figure 3 The structural dimensions are shown in the longitudinal section of the first-stage blade disk. A schematic diagram of the first and second-stage blade disks after installation with the casing is shown below. Figure 4 .

[0003] Because the annular groove is some distance from the outer end face of the turbine casing, it is difficult to align the upper and lower points of the probe with the measuring part of the groove protrusion when using conventional calipers. Previously, sheet-shaped groove width feeler gauges were used to inspect the dimensions of this type of structure. The go and stop dimensions of the feeler gauge controlled the upper and lower limits of the groove width to judge the passability of the machining. However, feeler gauges are not suitable for measuring intermediate dimensions during the machining process on the production floor and cannot provide the feed rate for finishing. Currently, with the continuous development and expansion of aircraft production, it is necessary to design a device for inspecting the dimensional values ​​of parts during the machining process, especially for the large-scale inspection of parts. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a device for detecting the width of the circumferential groove inside the casing.

[0005] The technical solution adopted in this application is as follows:

[0006] A device for detecting the width of a circumferential groove inside a casing includes a base plate, a bracket, a dial indicator, a lever, and a measuring rod, wherein:

[0007] The bracket has a central hole along the axial direction, and an elongated hole extending to the central hole is provided perpendicularly on the outer cylindrical surface of the bracket. The measuring rod is axially movable and movably disposed in the central hole of the bracket.

[0008] The base plate is a symmetrical fan-shaped structure and is detachably and vertically installed at one end of the bracket. During measurement, one side and the outer arc surface of the base plate respectively contact the arc bottom surface of the side of the inner circumferential groove of the casing.

[0009] The frame is detachably mounted on the symmetrical center line on the other side of the base plate;

[0010] The lever is hinged to the instrument frame at its middle part by a pivot pin. During measurement, the measuring surface of one end of the lever contacts the surface to be measured in the circumferential groove inside the housing. The other end extends into the center hole of the bracket through an elongated hole and abuts against one end of the measuring rod. The other end of the measuring rod abuts against the contact of the measuring instrument, which is used to transmit the swing of the lever around the pivot pin to the measuring instrument to change the reading.

[0011] Furthermore, a detachable sleeve is provided in the central hole of the bracket, and the measuring rod is axially movable within the sleeve.

[0012] Furthermore, the bracket is also provided with set screws for fixing and limiting the sleeve.

[0013] Furthermore, a spring is also fitted on the measuring rod, with one end of the spring abutting against the stepped portion of the central hole and the other end abutting against the shoulder of the measuring rod.

[0014] Furthermore, a gauge clip for mounting a measuring instrument is provided in the central hole at the end of the bracket away from the base plate, and a gauge clip screw for fixing and limiting the measuring instrument is provided on the outer cylindrical surface of the bracket.

[0015] Furthermore, the end of the measuring rod that abuts against the lever is arc-shaped.

[0016] Furthermore, the radius of the arc of the base plate matches the radius of the radial bottom of the circumferential groove inside the casing, and the included angle between the two straight edges of the base plate is 90° to 100°.

[0017] Furthermore, the base plate is also symmetrically provided with hollowed-out sections for weight reduction.

[0018] Furthermore, one end of the bracket is provided with a flange portion perpendicular to the axis, and the base plate is detachably mounted on the flange portion by a second screw.

[0019] Furthermore, the watch holder is detachably mounted on the symmetrical center line of the side of the base plate by means of a cylindrical pin and a first screw.

[0020] Compared with the prior art, this application has the following advantages:

[0021] This application provides a device for detecting the width of a circumferential groove inside a casing, including a base plate, a bracket, a dial indicator, a lever, and a measuring rod. The bracket has a central hole along its axial direction, and an elongated hole extending perpendicularly to the central hole is provided on the outer cylindrical surface of the bracket. The measuring rod is axially movable within the central hole of the bracket. The base plate has a symmetrical fan-shaped structure and is detachably and vertically mounted at one end of the bracket. The dial indicator is detachably mounted on the symmetrical center line of the side of the base plate. The middle part of the lever is hinged to the dial indicator via a pivot pin. During measurement, the measuring surface of one end of the lever contacts the surface to be measured in the circumferential groove inside the casing, and the other end extends through the elongated hole into the central hole of the bracket, abutting against one end of the measuring rod. The other end of the measuring rod abuts against the contact of the measuring instrument, transmitting the swing of the lever around the pivot pin to the measuring instrument to change the reading. This application has a simple structure, low manufacturing cost, convenient and quick operation, and stable and reliable measurement results, meeting the needs of batch testing of parts in production sites. This application solves the problem of on-site measurement of the dimensions of special structures in the inner cavity of small and medium-sized engine casings, such as multi-layered circumferential grooves deep inside. It improves the accuracy of machining through precise measurement, fills the gap in the lack of dedicated tooling for measuring such dimensions during machining, and has guiding and practical significance for the design of tooling used for similar measurements.

[0022] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. The application will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 This is a schematic diagram of the axial flow casing assembly.

[0025] Figure 2 This is a schematic diagram of the blade disk structure.

[0026] Figure 3 This is a schematic diagram of the structural dimensions of the longitudinal section of the first-stage blade disk.

[0027] Figure 4 This is a schematic diagram showing the first and second stage blade disks after installation with the casing.

[0028] Figure 5 This is a cross-sectional schematic diagram of the casing inner circumferential groove width detection device according to a preferred embodiment of this application.

[0029] Figure 6 This is a left-side view of the casing circumferential groove width detection device according to a preferred embodiment of this application.

[0030] Figure 7 This is a schematic representation of the measurement in a preferred embodiment of this application.

[0031] Figure 8 This is a front view schematic diagram of the base plate according to a preferred embodiment of this application.

[0032] Figure 9 for Figure 8 Schematic diagram of the sectional view along the AA direction.

[0033] Figure 10 This is a front view schematic diagram of the table frame according to a preferred embodiment of this application.

[0034] Figure 11 for Figure 10 Schematic diagram of the BB-direction section.

[0035] Figure 12 This is a schematic diagram of the lever in a preferred embodiment of this application.

[0036] Figure 13 This is a cross-sectional schematic diagram of the bracket according to a preferred embodiment of this application.

[0037] Figure 14 This is a left-side view of the bracket according to a preferred embodiment of this application.

[0038] Figure 15 This is a front view schematic diagram of the measuring rod according to a preferred embodiment of this application.

[0039] Figure 16 This is a cross-sectional schematic diagram of the sleeve according to a preferred embodiment of this application.

[0040] Figure 17 This is a schematic front view of the counter element according to a preferred embodiment of this application.

[0041] Figure 18 This is a top view of the watch component according to a preferred embodiment of this application.

[0042] The following components are shown in the diagram: 1. Base plate; 2. Cylindrical pin; 3. Washer; 4. First screw; 5. Dial holder; 6. Lever; 7. Second screw; 8. Bracket; 9. Set screw; 10. Measuring rod; 11. Sleeve; 12. Spring; 13. Dial clip; 14. Dial clip screw; 15. Shaft pin. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] Reference Figure 5 and Figure 6A preferred embodiment of this application provides a device for detecting the width of a circumferential groove inside a casing, comprising a base plate 1, a bracket 8, a dial indicator 5, a lever 6, and a measuring rod 10, wherein:

[0045] The bracket 8 is provided with a central hole along the axial direction, and an elongated hole extending to the central hole is provided perpendicularly on the outer cylindrical surface of the bracket 8. The measuring rod 10 is axially movable and movably disposed in the central hole of the bracket 8.

[0046] The base plate 1 has a symmetrical fan-shaped structure and is detachably and vertically installed at one end of the bracket 8 (see...). Figure 8 and Figure 9 During measurement, one side surface and the outer arc surface of the base plate 1 respectively contact the arc bottom surface of the side surface of the inner circumferential groove of the casing (see...). Figure 5 Because the width of the surface to be measured of the lever 6 is very narrow, it is easy for the lever 6 to detach from the measuring surface at one end during the measurement process. Therefore, in this embodiment, one side surface and the outer arc surface of the base plate 1 are respectively in contact with the arc bottom surface of the side surface of the inner circumferential groove of the casing, thereby restricting the position of the base plate 1 in the X and Y directions. Since the lever 6 is fixed on the base plate 1 by the gauge holder 5, the relative position of the measuring surface of the lever 6 and the surface to be measured of the inner circumferential groove of the casing is restricted, ensuring that the measuring surface of the lever 6 and the surface to be measured of the inner circumferential groove of the casing can quickly and effectively contact each other during the measurement process.

[0047] The table frame 5 is detachably mounted on the symmetrical center line of the other side of the base plate 1 (see...). Figure 10 and Figure 11 );

[0048] The lever 6 is hinged to the meter holder 5 at its middle section via a pivot pin 15. One end of the lever 6 has its measuring surface in contact with the surface to be measured in the circumferential groove inside the housing during measurement. The other end extends through an elongated hole into the center hole of the bracket 8 and abuts against one end of the measuring rod 10. The other end of the measuring rod 10 abuts against the contact of the measuring meter, thus transmitting the swing of the lever 6 around the pivot pin 15 to the measuring meter (see...). Figure 7 This causes the reading to change.

[0049] This embodiment features a simple structure, low manufacturing cost, convenient and quick operation, and stable and reliable measurement results, meeting the needs of batch inspection of parts in production sites. This application solves the problem of on-site measurement of the dimensions of special structures within the casing of small and medium-sized engines, such as multi-layered circumferential grooves deep inside. Precise measurement improves the accuracy of machining, fills the gap in methods for measuring such dimensions using dedicated tooling, and provides guidance and practical significance for the design of tooling used in similar measurements.

[0050] Preferably, such as Figure 16As shown, a detachable sleeve 11 is also provided in the center hole of the bracket 8. The measuring rod 10 is axially movable in the sleeve 11. When the inner hole of the sleeve 11 is worn, only the sleeve needs to be replaced, and there is no need to replace the bracket 8, which facilitates maintenance and reduces maintenance costs.

[0051] Preferably, such as Figure 5 As shown, the bracket 8 is also provided with a set screw 9 for fixing and limiting the sleeve 11, so as to ensure that the installation position of the sleeve 11 remains fixed.

[0052] Preferably, such as Figure 5 As shown, a spring 12 is also fitted on the measuring rod 10. One end of the spring 12 abuts against the stepped part of the central hole, and the other end abuts against the shoulder of the measuring rod 10, ensuring that the lever 6 is in contact with the surface to be measured in the circumferential groove inside the casing.

[0053] Preferably, such as Figure 5 As shown, a measuring instrument clip 13 is provided in the center hole at the end of the bracket 8 away from the base plate 1 for mounting the measuring instrument, and a measuring instrument clip screw 14 is provided on the outer cylindrical surface of the bracket 8 for fixing and limiting the measuring instrument, which facilitates the installation and fixing of the measuring instrument.

[0054] Preferably, such as Figure 5 and Figure 15 As shown, the end of the measuring rod 10 that contacts the lever 6 is arc-shaped to ensure contact stability and accuracy of measurement results.

[0055] Preferably, such as Figure 8 As shown, the radius of the arc of the base plate 1 matches the radius of the radial bottom of the circumferential groove inside the casing. The included angle between the two straight edges of the base plate 1 is 90° to 100°, and in this embodiment it is 100°, ensuring that the fan-shaped structure has a sufficient distance L1 between it and the contact surface of the part end face (see...). Figure 6 This ensures accurate measurement and appropriate weight of the base plate 1.

[0056] Preferably, such as Figure 8 and Figure 9 As shown, the base plate 1 is also symmetrically provided with hollowed-out parts for weight reduction, which reduces the load during use and reduces the labor intensity during operation.

[0057] Preferably, such as Figure 13 and Figure 14 As shown, one end of the bracket 8 is provided with a flange portion perpendicular to the axis, and the base plate 1 is detachably installed on the flange portion by means of the second screw 7, which makes installation convenient and quick.

[0058] Preferably, such as Figure 5As shown, the table frame 5 is detachably installed on the symmetrical center line of the side of the base plate 1 by means of cylindrical pin 2 and first screw 4, which makes the installation quick and precise.

[0059] In the above embodiment, the contact measurement components include a base plate 1, a lever 6, and components that transmit measurement parameters from the inner cavity include a pin 15 and a measuring rod 10. Other structural components include a dial indicator frame 5, a bracket 8, a sleeve 11, a spring 12, a dial indicator clip 13, and a dial indicator clip screw 14. During measurement, the hand grips the circular part of the bracket 8, causing the base plate 1 and the lever 6 to extend into the previously machined groove (see...). Figure 5 The fan-shaped portion of the base plate 1 rests against the lower end face of the groove (the inner end face of the groove). The portion of lever 6 near its upper end face is compressed by the solid part of the component, causing lever 6 to rotate around the pivot pin of component 15. Lever 6 then slides into the groove cavity, entering the measuring state of the instrument holder (see...). Figure 6 ).

[0060] If the base plate 1 is not a fan-shaped structure and the contact surface with the part is a narrow surface, then when the handle is very long, it cannot be guaranteed that the base plate 1 and the narrow protruding edge end face of the part will make correct contact in the normal direction, and the dimensional measurement results will be incorrect.

[0061] The fan-shaped structure of base plate 1 has a certain curvature with the protruding edge of the part. The diameter of the fan-shaped structure contacts the inner circle of the part. The fan-shaped structure is symmetrical from left to right, so that the center of the handle of bracket 8, the center of the part, the measuring points of base plate 1 and lever 6 are collinear. Thus, the fan-shaped structure can only be oscillated in the collinear direction when the handle of bracket 8 is turned, and cannot swing in the left-right direction. This structure ensures that the groove width of 24mm measured by the measuring points of base plate 1 and lever 6 is the actual normal dimension, resulting in higher accuracy.

[0062] In a preferred embodiment, such as Figure 6 As shown, the distance between the two points where the fan-shaped structure contacts the end face of the part is determined by L1≈140 based on the circumference of the part, and the structure is tilted 30 degrees to the left and right along the L1 direction. ” Calculations show that when the length L2 of bracket 8 in this example is 220mm, the upper end of bracket 8 swings left and right by about 220*(0.5°)=2mm. According to the proportional calculation, the processing point of the base plate 1 and lever 6 at the measurement position will swing left and right by Δ=2 / 220*24=0.22. According to the trigonometric relationship, the reading error of the measurement dimension 24 is 0.001mm, which is very small and beneficial to the processing control of the groove width.

[0063] When the measuring part is deeper than the end face of the casing and the handle of the bracket 8 is longer, if the size of L1 is smaller, the bracket 8 is more likely to tilt left and right, which, based on experience, will reach -3° to +3°. However, if the size of L1 is larger, the weight of the gauge frame is greater and the fit is more stable, and the span of the left and right support points is larger. These two reasons provide better control over the swing of the handle.

[0064] In the above embodiment, a general measuring instrument (see [reference needed]) is used inside hole 13 of the gauge clip. Figure 7 ), then the task can be completed. Figure 1 Medium-sized measurements. This measurement method is an indirect measurement; before measuring the part, a 24mm long matching piece is required (see...). Figure 17 and Figure 18 The workpiece is then compared with the table, and the difference between the table and the measurement position on the workpiece is obtained. Finally, the actual size of the workpiece is obtained by combining the results.

[0065] Bracket 8 (will) Figure 13 and Figure 14 The support 8 is the main structural component of the device. It is long enough to extend beyond the part while still providing space for the operator to grip it. The base plate 1 is fixed to the right end of the support 8 with four screws. A measuring rod 10, which transmits movement, is fitted inside the center hole of the support 8. One end of the lever 6 abuts against the left end of the measuring rod 10. The movement generated by the lever 6 during measurement is transmitted to the measuring instrument inserted in the measuring instrument clip 13 (the measuring head at the bottom of the instrument abuts against the right end of the measuring rod 6). The left and right movement of the measuring head of the measuring instrument causes the pointer on the dial to deflect.

[0066] The lever 6 (see) Figure 12 There are two measuring points, one contacting the end face of the part's groove and the other the left end of the measuring rod 10. The distances from the two measuring points to the center of the shaft pin 15 must be in a 1:1 ratio to ensure accurate transmission of the linear displacement value of the lever measuring point on the end face of the part's groove. When measurement is required after the part is machined, the base plate 1 and the measuring part of the lever 6 contact the two end faces of the workpiece. Through the deflection of the lever 6 around the shaft pin of part 15 and the axial movement of the measuring rod 10, the reading of the reading meter on the right end face of the measuring rod 10 changes. This yields the difference between the two end faces of the machined part and the given dimension of the workpiece, thus obtaining the groove width dimension in this state.

[0067] Before use, the dial indicator is aligned. When the measuring parts of the base plate 1 and lever 6 are at the specified dimensions, the pointer of the dial indicator held in the dial indicator clamp 13 is adjusted to zero, and then compared with the actual groove width value of the part. This measurement method belongs to the indirect method in measurement technology. In this way, the difference between the two end faces of the machined annular groove of the part and the given dimension of the dial indicator is obtained, and the groove width dimension in this state is obtained.

[0068] The table matching process requires the following table matching components: Figure 17 and Figure 18 As shown, place the base plate 1 of the table frame stably on Figure 17On surface A, lever 6 contacts the upper surface of the dial indicator, which is 24mm in size. After the base plate 1 and lever 6 contact the dial indicator, lever 6 will generally undergo a certain amount of spatial movement. The momentum of lever 6 is transmitted through the deflection of the pivot pin 15 and the up and down movement of the measuring rod 10, causing the reading of the reading meter that contacts the right end face of the measuring rod 10 to change. At this time, the pointer of the reading meter should be adjusted to zero.

[0069] Because the actual size of 24mm is branded on the watch parts during manufacturing, making them very precise, the straight line dimension between the contact point of the base plate 1 and the lever 6 when the pointer is at zero is the actual size branded on the watch parts.

[0070] When measuring a part, the dial indicator stand is placed on the housing at the position of the groove width to be measured. The base plate 1 is stably supported on the raised edge end face of one of the grooves. The lever 6 will contact the raised edge end face of a groove. Since the dimensions are constantly changing during the machining process, the displacement of the lever 6 will vary. The lever 6 transmits the displacement value 1:1 to the contact of the measuring instrument through the measuring rod 10. The displacement value will cause the display value of the measuring instrument to change. The deviation of the measuring instrument from zero is read and compared with whether it is within the allowable part tolerance range (0, +0.04) to determine whether the machining dimension is qualified.

[0071] This application presents a feasible and simple measurement method for machining processes, providing a device for measuring the width of the inner circumferential groove of a casing with a unique inner circular surface. Currently, by applying this inner circumferential groove width detection device, operators can quickly detect the machining allowance of parts on the production site, shortening the detection time, improving work efficiency, and ensuring the accuracy of subsequent machining. It has been successfully applied in multiple machine models.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for detecting the width of a circumferential groove inside a casing, characterized in that, Includes a base plate (1), a bracket (8), a table holder (5), a lever (6), and a measuring rod (10), wherein: The bracket (8) has a central hole along the axial direction, and the outer cylindrical surface of the bracket (8) has an elongated hole extending to the central hole. The measuring rod (10) is axially movable and movably disposed in the central hole of the bracket (8). The base plate (1) is a fan-shaped structure that is symmetrical on the left and right and is detachably and vertically installed at one end of the bracket (8). During measurement, one side and the outer arc surface of the base plate (1) respectively contact the arc bottom surface of the side of the inner circumferential groove of the casing. The table frame (5) is detachably installed on the symmetrical center line on the other side of the base plate (1); The middle part of the lever (6) is hinged to the instrument frame (5) by a pivot pin (15). The measuring surface of one end of the lever (6) contacts the surface to be measured in the circumferential groove inside the casing during measurement. The other end extends into the center hole of the bracket (8) through an elongated hole and abuts against one end of the measuring rod (10). The other end of the measuring rod (10) abuts against the contact of the measuring instrument. This is used to transmit the swing of the lever (6) around the pivot pin (15) to the measuring instrument to change the reading.

2. The casing inner circumferential groove width detection device according to claim 1, characterized in that, A detachable sleeve (11) is also provided in the central hole of the bracket (8), and the measuring rod (10) is axially movable in the sleeve (11).

3. The casing inner circumferential groove width detection device according to claim 2, characterized in that, The bracket (8) is also provided with a set screw (9) for fixing and limiting the sleeve (11).

4. The casing inner circumferential groove width detection device according to claim 1, characterized in that, A spring (12) is also fitted on the measuring rod (10). One end of the spring (12) abuts against the stepped part of the central hole, and the other end abuts against the shoulder of the measuring rod (10).

5. The casing inner circumferential groove width detection device according to claim 1, characterized in that, The bracket (8) is provided with a gauge clip (13) for mounting a measuring instrument in the center hole at one end away from the base plate (1), and the outer cylindrical surface of the bracket (8) is provided with a gauge clip screw (14) for fixing and limiting the measuring instrument.

6. The casing inner circumferential groove width detection device according to claim 1, characterized in that, The end of the measuring rod (10) that abuts against the lever (6) is arc-shaped.

7. The casing inner circumferential groove width detection device according to claim 1, characterized in that, The radius of the arc of the base plate (1) matches the radius of the radial bottom of the circumferential groove inside the casing, and the included angle between the two straight sides of the base plate (1) is 90° to 100°.

8. The casing inner circumferential groove width detection device according to claim 1, characterized in that, The base plate (1) is also symmetrically provided with hollowed-out parts for weight reduction.

9. The casing inner circumferential groove width detection device according to claim 1, characterized in that, One end of the bracket (8) is provided with a flange portion perpendicular to the axis, and the base plate (1) is detachably installed on the flange portion by means of a second screw (7).

10. The casing inner circumferential groove width detection device according to claim 1, characterized in that, The watch holder (5) is detachably mounted on the symmetrical center line of the side of the base plate (1) by means of a cylindrical pin (2) and a first screw (4).

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