Device for measuring outer diameter of main connecting rod of aero-engine

Abstract

The invention belongs to the technical field of engine measurement, and particularly relates to an aero-engine main connecting rod outer diameter measuring device which comprises a dial indicator, a positioning block, a clamp body and a sleeve, a plurality of sliding blocks are arranged in the positioning block in a sliding mode, measuring heads are arranged at the outer ends of the sliding blocks, and the positioning block is supported on the end face of a main connecting rod. The measuring head clings to the outer circumferential surface of the main connecting rod; a clamp body is arranged on the upper side of the positioning block, a first spring is arranged on the inner side of the clamp body, and one end of the first spring is connected with the sliding block. A sleeve is arranged at the upper end of the clamp body; a dial indicator is arranged on the upper side of the sleeve; one end of each sliding block is connected with the steel ball in a matched mode through an inclined face, a sliding rod is arranged in the sleeve in a sliding mode, and the sliding rod sequentially penetrates through the clamp body and the positioning block and abuts against the steel ball. A measuring rod of the dial indicator is arranged opposite to the sliding rod. According to the structural characteristics of the main connecting rod, the measuring device is used for limiting, detection data are accurate, operation is simple, detection speed is high, and detection efficiency can be greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engine measurement, and in particular relates to a device for measuring the outer diameter of a main connecting rod of an aero-engine. Background Art

[0002] When a certain type of aircraft engine is overhauled, its main connecting rod needs to be inspected for faults. Fig.15 and Fig.16 As shown, it is a structural diagram of the main connecting rod. When inspecting the main connecting rod, it is necessary to check the outer diameter dimensions of both ends of the main side rod, that is, the dimensions of the first outer cylindrical surface C and the second outer cylindrical surface B.

[0003] For example, the dimensions of the main connecting rod of a certain type of aircraft engine are as follows: the outer diameter of the first outer cylindrical surface C is Ф103mm, and the outer diameter of the second outer cylindrical surface B is Ф102.6mm. The outer diameter of the first outer cylindrical surface C of the main connecting rod is Ф103mm, and the dimension surface is relatively long, and the straight surface is 4mm long. When measuring with a general outer diameter micrometer, its measuring surface is relatively easy to align; but the outer diameter of the second outer cylindrical surface B is Ф102.6mm, and after removing the R5 chamfer and 1×45° chamfer, the straight surface dimension is only 1.1mm long. If a general outer diameter micrometer is used for measurement, the micrometer probe is not easy to accurately clamp on the second outer cylindrical surface B, and it is very easy to clamp on the chamfer surface A, resulting in inaccurate measurement results, which leads to misjudgment during inspection, and the qualified main connecting rod is judged as an unqualified product. At the same time, because the first outer cylindrical surface C and the second outer cylindrical surface B need to be accurately found during inspection, the inspection speed is slow and the inspection efficiency is low. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present invention provides a device for measuring the outer diameter of a main connecting rod of an aero-engine.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A device for measuring the outer diameter of a main connecting rod of an aircraft engine comprises a dial indicator, a positioning block, a clamping body and a sleeve, wherein a plurality of sliding blocks are slidably arranged inside the positioning block, a probe is arranged at the outer end of the sliding block, the positioning block is supported on the end face of the main connecting rod, and the probe is arranged close to the outer circumferential surface of the main connecting rod; a clamping body is arranged on the upper side of the positioning block, a first spring is arranged on the inner side of the clamping body, and one end of the first spring is connected to the sliding block; a sleeve is arranged on the upper end of the clamping body, and a dial indicator is arranged on the upper side of the sleeve; one end of a plurality of the sliding blocks is connected to a steel ball through an inclined surface, a sliding rod is slidably arranged in the sleeve, and the sliding rod passes through the clamping body and the positioning block in sequence and abuts against the steel ball; a measuring rod of the dial indicator is arranged opposite to the sliding rod.

[0007] Optionally, a plurality of slide grooves are evenly distributed on the circumference of the positioning block, and the slide grooves extend through the upper end surface of the positioning block. The slider is slidably arranged in the slide grooves, and the upper end of the slider slides closely against the bottom end surface of the clamping body.

[0008] Optionally, a plurality of stepped through holes are evenly distributed on the circumference of the clamp body, the outer hole section of the stepped through hole is threadedly connected with a first screw, the first spring is arranged in the stepped through hole and connected to the first screw; the upper end of the slider is threadedly connected with a second screw, the second screw is threadedly connected with a third screw, and one end of the first spring is connected to the third screw.

[0009] Optionally, a plurality of sector-shaped blocks are evenly distributed on the circumference of the upper end of the positioning block, and the slide groove is arranged between two adjacent sector-shaped blocks; the steel ball is slidably arranged on the inner wall of the sector-shaped block.

[0010] Optionally, a limiting hole is opened at the center of the bottom side of the clamp body, and the fan-shaped block is arranged in the limiting hole; a plurality of accommodating grooves are opened on the circumferential inner wall of the limiting hole, and the accommodating grooves are connected to the stepped through hole, and the second screw and the third screw are arranged in the accommodating grooves.

[0011] Optionally, a bracket is provided on the upper side of the sleeve, the middle of the bracket is hollowed out to form a U-shaped structure, the bottom section of the bracket is inserted into the inner wall of the sleeve, and the upper section of the bracket is connected to the dial indicator.

[0012] Optionally, the upper section of the bracket is provided with a first mounting hole, and the lower section of the bracket is provided with a second mounting hole, and the first mounting hole and the second mounting hole are coaxially arranged; the sliding rod extends through the second mounting hole to the middle hollow position of the bracket, and the dial indicator is installed in the first mounting hole.

[0013] Optionally, a through slot is horizontally provided in the middle of the bracket, a hinge head is provided on the bracket outside the through slot, and a third mounting hole connected to the through slot is vertically provided on the upper end of the bracket; an L-shaped pressure rod is hinged on the hinge head, and the pressure rod passes through the through slot to the other side of the bracket; a fourth screw is provided in the third mounting hole, and a second spring is provided between the fourth screw and the pressure rod; an avoidance hole is provided at the upper end of the pressure rod, and the sliding rod passes through the avoidance hole, and an arc-shaped abutting portion is provided at the bottom end of the avoidance hole, and a stop sleeve is provided on the sliding rod, and the stop sleeve is provided on the bottom side of the abutting portion.

[0014] Optionally, a third spring is provided on the sliding rod, and one end of the third spring is provided close to the lower end surface of the bracket; a fifth screw is threadedly connected to the sleeve, and the fifth screw is provided opposite to the pressure rod.

[0015] Optionally, the aircraft engine main connecting rod outer diameter measuring device further includes a counter-measurement piece, wherein the two sides of the main connecting rod are respectively a first outer cylindrical surface and a second outer cylindrical surface, and a chamfered surface is provided on the second outer cylindrical surface, and the outer diameter of the counter-measurement piece is the same as the size of the first outer cylindrical surface.

[0016] The present invention has the following advantages and beneficial effects:

[0017] The device of the present invention is based on the structural characteristics of the main connecting rod and the characteristics of the measuring surfaces on both sides thereof. At the same time, the size difference between the two is 0.4mm. A relative measurement method is adopted. Before measurement, a standard measuring ring is used for comparison. The size of the standard measuring ring is added or subtracted according to the measurement data to obtain the measured outer diameter size, so as to realize the measurement of the outer diameter sizes of Ф102.6 and Ф103 of the main connecting rod. The measuring device is limited and the R5 chamfered surface will not be measured. The detection data is accurate, the operation is simple, the detection speed is fast, the detection efficiency can be greatly improved, and there is no requirement for the operating skills of the operator.

[0018] The present invention adopts a three-claw measurement method, and three probes evenly distributed on the circumference together form a three-point arc. The three-point measurement method is convenient for measurement, has high measurement accuracy, fast measurement speed, and simple operation. A positioning structure is designed on the measuring device, which is used to place the measuring device in the main connecting rod. The probe measurement position is determined on the surface to be measured with dimensions of Ф102.6 and Ф103, and will not measure to the R5 chamfer due to the measuring surface being too short, resulting in inaccurate measurement data, thereby causing misjudgment of the conclusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure diagram of the device for measuring the outer diameter of the main connecting rod of an aircraft engine in the present invention;

[0020] Figure 2 for Figure 1 Front view of

[0021] Figure 3 A cross-sectional view of the device for measuring the outer diameter of the main connecting rod of an aircraft engine in the present invention;

[0022] Figure 4 A cross-sectional view of a measuring device for measuring the outer diameter of a main connecting rod of an aircraft engine according to the present invention;

[0023] Figure 5 A cross-sectional view of the main connecting rod of an aircraft engine measured by the main connecting rod outer diameter measuring device of the present invention;

[0024] Figure 6 for Figure 5 A partial enlarged view of point a in the middle;

[0025] Figure 7 This is one of the structural diagrams of the positioning block in the present invention;

[0026] Figure 8This is the second structural diagram of the positioning block in the present invention;

[0027] Fig. 9 is a cross-sectional view of the sleeve in the present invention;

[0028] Fig.10 It is a structural diagram of the pressure rod in the present invention;

[0029] Fig.11 is a structural diagram of the support in the present invention;

[0030] Fig.12 is a cross-sectional view of the bracket in the present invention;

[0031] Fig.13 It is one of the specific structural diagrams of the present invention;

[0032] Fig.14 This is the second specific structural diagram of the present invention;

[0033] Fig.15 It is a structural diagram of the main connecting rod in the present invention;

[0034] Fig.16 for Fig.15 Front view of.

[0035] Figure markings: 1-counterpart, 2-main connecting rod, 3-positioning block, 301-limiting block, 302-slide groove, 303-fourth threaded hole, 304-sector block, 305-center hole, 4-steel ball, 5-clamp body, 501-positioning cylinder, 502-fifth threaded hole, 503-first countersunk hole, 504-step through hole, 505-limiting hole, 506-accommodating groove, 6-sleeve, 601-first connecting hole, 602-second connecting hole, 603-third connecting hole, 604-first threaded hole, 605-second threaded hole, 606-third threaded hole, 607-second countersunk hole, 608-fourth connecting hole, 7-seventh screw, 8-guide sleeve, 9-slide rod, 10-fifth screw, 11-third spring, 12-bracket, 121-first mounting hole, 122-third mounting hole, 123-through groove, 124-hinge head, 125-second mounting hole, 126-first annular groove, 13-pressure rod, 131-avoidance hole, 132-abutment part, 133-hinge hole, 14-stop sleeve, 15-locking screw, 16-dial indicator, 17-meter clamp, 18-fourth screw, 19-second spring, 20-pin shaft, 21-cylindrical pin, 22-eighth screw, 23-second screw, 24-third screw, 25-first spring, 26-first screw, 27-slider, 28-ninth screw, 30-probe, 31-sixth screw. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example

[0039] like Figure 1 to Figure 14 As shown, a device for measuring the outer diameter of a main connecting rod of an aircraft engine includes a dial indicator 16, a positioning block 3, a clamp body 5, a sleeve 6, etc.

[0040] like Figure 1 to Figure 14 As shown, a plurality of sliders 27 are slidably arranged inside the positioning block 3, one end of the slider 27 extends outward from the positioning block 3, a probe 30 is arranged at the outer end of the slider 27, the positioning block 3 is supported on the end face of the main connecting rod 2, and the probe 30 is arranged close to the outer circumferential surface of the main connecting rod 2. A clamp body 5 is arranged on the upper side of the positioning block 3, a first spring 25 is arranged on the inner side of the clamp body 5, and one end of the first spring 25 is connected to the slider 27. A sleeve 6 is arranged on the upper end of the clamp body 5, and a dial indicator 16 is arranged on the upper side of the sleeve 6. One end of the plurality of sliders 27 is connected to the steel ball 4 through an inclined surface, and a slide bar 9 is slidably arranged inside the sleeve 6, and the slide bar 9 passes through the clamp body 5 and the positioning block 3 in sequence and abuts against the steel ball 4; the measuring rod of the dial indicator 16 is arranged opposite to the slide bar 9. A steel ball 4 is installed in the positioning block 3. The steel ball 4 is tangent to the upper inclined surface of the slider 27. The steel ball 4 is used so that when the steel ball 4 moves downward, a force component in the X-axis direction is generated between the steel ball 4 and the slider 27, pushing the slider 27 to move outward from the axis. When the steel ball 4 pushes the slider 27 to move, the three sliders 27 move synchronously with the same movement frequency. On the contrary, under the action of the first spring 25, the slider 27 moves inward, pushing the steel ball 4 to move upward.

[0041] like Figure 3 and Figure 6 As shown, one end of the probe 30 is inserted into the inner hole of the slider 27, and the upper end of the probe 30 is threadedly connected with a ninth screw 28, and a gasket 29 is provided on the ninth screw 28. The gasket 29 is arranged on the upper end surface of the slider 27. The probe 30 is detachably fixed to the slider 27 by using the ninth screw 28 and the gasket 29.

[0042] like Figure 3 , Figure 6 to Figure 8As shown, further, the positioning block 3 is evenly distributed with a plurality of slide grooves 302 on its circumference, and the slide grooves 302 extend to the upper end surface of the positioning block 3. The slider 27 is slidably arranged in the slide groove 302, and the upper end of the slider 27 slides close to the bottom end surface of the clamp body 5. In the present invention, the outer diameter measuring device of the main connecting rod 2 of the aircraft engine is a three-claw outer diameter measuring device, so the number of sliders 27 and the slide grooves 302 are correspondingly arranged. The slider 27 is fixedly mounted with a probe 30, and the three probes 30 form an outer diameter arc line, and the three-point arc formed by the three probes 30 is the final measurement size.

[0043] The axial dimensions of the positioning block 3 and the probe 30 are fixed, and the probe 30 protrudes 2 mm from the bottom positioning surface of the positioning block 3, to ensure that after the positioning block 3 is installed in the main connecting rod 2, the measuring position of the probe 30 is determined on the surfaces to be measured with dimensions of Ф102.6 and Ф103 (i.e. the first outer cylindrical surface C and the second outer cylindrical surface B), and the R5 chamfered position (i.e. the chamfered surface C) will not be measured.

[0044] like Figure 3 , Figure 6 to Figure 8 , Fig.13 and Fig.14 As shown, further, a plurality of stepped through holes 504 are evenly distributed on the circumference of the clamp body 5, the outer hole section of the stepped through hole 504 is threadedly connected with the first screw 26, the first spring 25 is arranged in the stepped through hole 504 and connected with the first screw 26; the upper end of the slider 27 is threadedly connected with the second screw 23, the upper end of the second screw 23 is set in an L shape, the second screw 23 is threadedly connected with the third screw 24, and one end of the first spring 25 is connected with the third screw 24. In this structure, the first spring 25 is used to limit the slider 27, and when the slider 27 slides, the first spring 25 is stretched or compressed accordingly.

[0045] Furthermore, a center hole 305 is provided inside the positioning block 3, a plurality of fan-shaped blocks 304 are evenly distributed on the circumference of the upper end of the positioning block 3, and the slide groove 302 is provided between two adjacent fan-shaped blocks 304; the steel ball 4 is slidably provided on the inner wall of the fan-shaped block 304, and the three fan-shaped blocks 304 are used to limit the steel ball 4.

[0046] Furthermore, a limiting hole 505 is provided at the bottom center of the clamp body 5, and the sector block 304 is arranged in the limiting hole 505 to realize the coaxial installation of the clamp body 5 and the positioning block 3. A plurality of receiving grooves 506 are provided on the circumferential inner wall of the limiting hole 505, and the receiving grooves 506 are connected with the stepped through hole 504, and the second screw 23 and the third screw 24 are arranged in the receiving grooves 506. This structural setting can accommodate the second screw 23 and the third screw 24, so that they have space to move. When the slider 27 moves, the second screw 23 and the third screw 24 will not collide and interfere with the clamp body 5, and the second screw 23 can only move in the receiving groove 506, so as to limit the sliding of the slider 27 and prevent it from leaving the slide groove 302.

[0047] Furthermore, the outer diameter of the clamp body 5 is larger than the inner diameter of the main connecting rod 2, so that the bottom end of the clamp body 5 can be supported on the end surfaces of both sides of the main connecting rod 2, and an arc-shaped limit block 301 is extended from the bottom end of the clamp body 5. The inner diameter of the limit block 301 is equal to or slightly smaller than the inner diameter of the inner hole of the main connecting rod 2, so that the limit block 301 can be set in the inner hole of the main connecting rod 2 to stably support and limit the overall device.

[0048] like Figure 1 to Figure 14 As shown, in the present invention, a bracket 12 is provided on the upper side of the sleeve 6 , the middle of the bracket 12 is hollowed out to form a U-shaped structure, the bottom section of the bracket 12 is plugged into the inner wall of the sleeve 6 , and the upper section of the bracket 12 is connected to the dial indicator 16 .

[0049] like Figure 3 , Fig. 9 , Fig.11 and Fig.12 As shown, the sleeve 6 is provided with a first connection hole 601, a second connection hole 602, a third connection hole 603 and a fourth connection hole 608 from top to bottom, the inner diameter of the first connection hole 601 is larger than the inner diameter of the second connection hole 602, and the inner diameters of the second connection hole 602, the third connection hole 603 and the fourth connection hole 608 are increased in sequence. The bottom section of the bracket 12 is inserted into the first connection hole 601, and the outer wall of the upper end of the sleeve 6 is evenly distributed with a plurality of first threaded holes 604, and the first threaded holes 604 are provided with an eighth screw 22, and the outer wall of the bottom section of the bracket 12 is provided with a first annular groove 126, and the end of the eighth screw 22 is tapered and is matched and arranged in the first annular groove 126, so as to realize the detachable installation of the bracket 12 and the sleeve 6.

[0050] like Figure 3 , Fig. 9 , Fig.11 and Fig.12As shown, the upper section of the bracket 12 is provided with a first mounting hole 121, and the lower section of the bracket 12 is provided with a second mounting hole 125, and the first mounting hole 121 and the second mounting hole 125 are coaxially arranged; the sliding rod 9 extends to the middle hollow position of the bracket 12 through the second mounting hole 125, and the dial indicator 16 is installed in the first mounting hole 121. Specifically: a dial clamp 17 is provided in the first mounting hole 121, and the measuring rod of the dial indicator 16 passes through the dial clamp 17, and the dial indicator 16 is fixed by tightening the dial clamp 17 with the locking screw 15 on the upper side of the bracket 12.

[0051] like Figure 3 , Fig. 9 , Fig.11 and Fig.12 As shown, further, a through slot 123 is horizontally provided in the middle of the bracket 12, a hinge head 124 is provided on the bracket 12 outside the through slot 123, and a third mounting hole 122 connected to the through slot 123 is vertically provided on the upper end of the bracket 12; a hinge hole 133 is provided at the end of the pressure rod 13, an L-shaped pressure rod 13 is hinged on the hinge head 124 through a pin 20, the pin 20 is provided in the hinge hole 133, and the pressure rod 13 passes through the through slot 123 to the other side of the bracket 12. A fourth screw 18 is provided in the third mounting hole 122, and a second spring 19 is provided between the fourth screw 18 and the pressure rod 13. Specifically: the second spring 19 is provided in the third mounting hole 122, the upper end of the second spring 19 is close to the bottom end of the fourth screw 18, and the pressure rod 13 is provided with a slot at the bottom side of the third mounting hole 122, and the bottom end of the second spring 19 is provided in the slot. An avoidance hole 131 is provided at the upper end of the pressure rod 13, and the avoidance hole 131 is located on the lower side of the measuring rod of the dial indicator 16. The slide rod 9 passes upward through the avoidance hole 131, and an arc-shaped abutment portion 132 tangent to the stopper sleeve 14 is provided at the bottom end of the avoidance hole 131. The stopper sleeve 14 is provided on the slide rod 9, and the stopper sleeve 14 is fixed by a cylindrical pin 21. The stopper sleeve 14 is provided on the bottom side of the abutment portion 132.

[0052] A bracket 12 is installed above the sleeve 6, and the bracket 12 is used to assemble the pressure rod 13 and the dial indicator 16. When the pressure rod 13 is pressed down, the stopper sleeve 14 drives the slide bar 9 to move downward. The second spring 19 is for releasing the pressure rod 13. Under the action of the second spring 19, the pressure rod 13 remains in an open state, which is conducive to the three probes 30 to have a tendency to move inward under the action of the first spring 25, ensuring that the three probes 30 are always in contact with the measured surface in the measuring state, thereby ensuring the measurement timeliness and measurement accuracy.

[0053] like Figure 3 and Figure 6 As shown, further, a limiting ring is provided in the middle section of the slide rod 9, and a third spring 11 is provided on the slide rod 9. The bottom side of the third spring 11 is supported on the limiting ring, and one end of the third spring 11 is provided close to the lower end surface of the bracket 12.

[0054] like Figure 3 As shown, further, the sleeve 6 is threadedly connected with a fifth screw 10, and the fifth screw 10 is arranged opposite to the pressure rod 13. Specifically, the sleeve 6 is provided with a second threaded hole 605 connected with the second connecting hole 602, and the fifth screw 10 is arranged in the second threaded hole 605.

[0055] When the pressure rod 13 is held and pressed inward, the abutment portion 132 contacts the stopper sleeve 14, driving the slide rod 9 to move downward. The fifth screw 10 limits the inward pressure distance of the pressure rod 13. The slide rod 9 drives the steel ball 4 to move downward, and the steel ball 4 generates a component force in the X-axis direction relative to the inclined surface of the slider 27, pushing the slider 27 to move outward. The probe 30 is fixed on the slider 27. When the slider 27 moves outward, the probe 30 moves outward with the slider 27. The outer diameter of the three-point circle formed by the three probes 30 becomes larger, and is larger than the dimensions Ф102.6 and Ф103 to be measured (that is, larger than the outer diameters of the first outer cylindrical surface C and the second outer cylindrical surface B). The measuring device can be used as shown in FIG. Figure 3 as well as Figure 6 Place it on the surface to be measured as shown.

[0056] The pressure rod 13 is released, and under the action of the first spring 25, the slider 27 moves inward, the steel ball 4 moves upward, and pushes the slider 9 upward, so that the probe 30 contacts the measured surface to achieve dimension measurement.

[0057] The present invention adopts a digital display dial indicator to transmit the measurement data to the digital repair system through the network, so as to realize online measurement and real-time data transmission. In the digital repair system, the calculation formula is input in advance, and the system background directly calculates and obtains the calculation result without manual data calculation. The low working efficiency of the traditional data input method and the problem of data transmission errors are greatly reduced.

[0058] like Figure 3 As shown, a guide sleeve 8 is provided in the third connecting hole 603, and an annular groove is provided on the outer wall of the guide sleeve 8. A third threaded hole 606 connected to the third connecting hole 603 is provided on the sleeve 6, and a sixth screw 31 is provided in the third threaded hole 606, and the sixth screw 31 is pressed against the guide sleeve 8 to fix. A guide sleeve 8 is installed on the sleeve 6 to control the coaxiality of the slide bar 9 installed therein and the sleeve 6. It is ensured that when the slide bar 9 moves up and down in the sleeve 6, the slide bar 9 and the axis of the clamp body 5 are always consistent. A third spring 11 is installed on the upper part of the slide bar 9. The purpose of the third spring 11 is to always keep a downward pressure on the slide bar 9, so that the slide bar 9 is stable when moving up and down, thereby improving the measurement accuracy.

[0059] like Figure 3As shown, further, a positioning cylinder 501 is provided at the upper end of the clamp body 5, and the positioning cylinder 501 is communicated with the limiting hole 505. The slide bar 9 is closely arranged on the inner wall of the positioning cylinder 501, and reaches the limiting hole 505 from the bottom side of the positioning cylinder 501 to abut against the steel ball 4. The positioning cylinder 501 is closely arranged on the inner wall of the fourth connecting hole 608, so as to realize the coaxial installation of the sleeve 6 and the clamp body 5.

[0060] like Figures 1 to 16 As shown, in the present invention, the device for measuring the outer diameter of the main connecting rod of an aircraft engine also includes a counter-piece 1, a first outer cylindrical surface C and a second outer cylindrical surface B on both sides of the main connecting rod 2, a chamfered surface A is provided on the second outer cylindrical surface B, and the outer diameter of the counter-piece 1 is the same as the size of the first outer cylindrical surface C. The counter-piece 1 is used as a calculation reference during measurement, and its actual size needs to be indicated for data processing after measurement.

[0061] like Figure 1 to Figure 14 As shown, a plurality of fourth threaded holes 303 are evenly distributed on the circumference of the positioning block 3, and a first countersunk hole 503 corresponding to the fourth threaded hole 303 is evenly distributed on the circumference of the clamp body 5. When the positioning block 3 and the clamp body 5 are connected in cooperation, the first countersunk hole 503 corresponds to the fourth threaded hole 303 one by one, and is fixed with a countersunk screw.

[0062] like Figure 1 to Figure 14 As shown, a plurality of fifth threaded holes 502 are evenly distributed on the circumference of the clamp body 5, and a second countersunk hole 607 is correspondingly opened on the bottom side of the sleeve 6, and the seventh screw 7 is screwed in to connect and fix the sleeve 6 and the clamp body 5.

[0063] Measurement principle and steps:

[0064] When the device of the present invention is used, the meter piece 1 is first used. The meter piece 1 is a standard measuring ring, and the actual size of the measuring ring is marked on the standard measuring ring. The meter piece 1 is placed on the operating platform, and the measuring device is picked up. Figure 4 As shown, it is placed on the counter piece 1. Under the action of the first spring 25, the three probes 30 are always in contact with the outer surface of the counter piece 1. Gently shake the measuring device a few times to ensure that the three-point probes 30 are in good contact with the counter piece 1. At this time, press the origin setting button of the dial indicator 16, and the dial indicator displays 0.

[0065] Hold the pressure rod 13, open the three probes 30, and take the measuring device out of the alignment part 1. Figure 5As shown, place the main connecting rod 2 on the operating platform, repeat the above actions, and gently shake the measuring device. The dial gauge 16 will display a data due to the different sizes of the counter-part 1 and the main connecting rod 2. This data is the difference between the size of the main connecting rod 2 to be measured and the counter-part 1. If the data displayed by the dial gauge 16 is a negative value, the actual value of the counter-part 1 minus the data displayed by the dial gauge 16 is the value to be measured of the main connecting rod 2. If the data displayed by the dial gauge 16 is a positive value, the actual value of the counter-part 1 plus the data displayed by the dial gauge 16 is the value to be measured of the main connecting rod 2. Through the digital display dial gauge 16, the measurement data is directly transmitted to the digital repair system, and the data is transmitted online in real time. The system background performs calculations to obtain the calculation results.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aircraft engine main connecting rod outer diameter measuring device, characterized in that: It includes a dial indicator, a positioning block, a clamping body and a sleeve, wherein a plurality of sliding blocks are slidably arranged inside the positioning block, a probe is arranged at the outer end of the sliding block, the positioning block is supported on the end face of the main connecting rod, and the probe is arranged close to the outer circumferential surface of the main connecting rod; a clamping body is arranged on the upper side of the positioning block, a first spring is arranged on the inner side of the clamping body, one end of the first spring is connected with the sliding block; a sleeve is arranged at the upper end of the clamping body, and a dial indicator is arranged on the upper side of the sleeve; one end of a plurality of the sliding blocks is connected with the steel ball through an inclined surface, a sliding rod is slidably arranged in the sleeve, the sliding rod passes through the clamping body and the positioning block in turn and abuts against the steel ball; the measuring rod of the dial indicator is arranged opposite to the sliding rod.

2. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 1, characterized in that: The positioning block is evenly distributed with a plurality of slide grooves on its circumference, the slide grooves penetrate to the upper end surface of the positioning block, the slider is slidably arranged in the slide grooves, and the upper end of the slider slides closely against the bottom end surface of the clamping body.

3. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 2, characterized in that: A plurality of stepped through holes are evenly distributed on the circumference of the clamp body, the outer hole section of the stepped through hole is threadedly connected with a first screw, the first spring is arranged in the stepped through hole and connected with the first screw; the upper end of the sliding block is threadedly connected with a second screw, the second screw is threadedly connected with a third screw, and one end of the first spring is connected to the third screw.

4. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 3, characterized in that: A plurality of sector blocks are evenly distributed on the circumference of the upper end of the positioning block, and the slide groove is arranged between two adjacent sector blocks; and the steel ball is slidably arranged on the inner wall of the sector block.

5. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 4, characterized in that: A limiting hole is provided at the center of the bottom side of the clamp body, and the fan-shaped block is arranged in the limiting hole; a plurality of receiving grooves are provided on the circumferential inner wall of the limiting hole, and the receiving grooves are connected with the stepped through hole, and the second screw and the third screw are arranged in the receiving grooves.

6. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 1, characterized in that: A bracket is arranged on the upper side of the sleeve, the middle of the bracket is hollowed out to form a U-shaped structure, the bottom section of the bracket is plugged into the inner wall of the sleeve, and the upper section of the bracket is connected to the dial indicator.

7. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 6, characterized in that: The upper section of the bracket is provided with a first mounting hole, and the lower section of the bracket is provided with a second mounting hole, and the first mounting hole and the second mounting hole are coaxially arranged; the sliding rod extends through the second mounting hole to the middle hollow position of the bracket, and the dial indicator is installed in the first mounting hole.

8. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 7, characterized in that: A through slot is horizontally provided in the middle of the bracket, a hinge head is provided on the bracket outside the through slot, and a third mounting hole connected with the through slot is vertically provided on the upper end of the bracket; an L-shaped pressure rod is hinged on the hinge head, and the pressure rod passes through the through slot to the other side of the bracket; a fourth screw is provided in the third mounting hole, and a second spring is provided between the fourth screw and the pressure rod; an avoidance hole is provided at the upper end of the pressure rod, and the sliding rod passes through the avoidance hole, and an arc-shaped abutting portion is provided at the bottom end of the avoidance hole, and a stop sleeve is provided on the sliding rod, and the stop sleeve is provided on the bottom side of the abutting portion.

9. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 8, characterized in that: The slide bar is provided with a third spring, one end of which is arranged close to the lower end surface of the bracket; the sleeve is threadedly connected with a fifth screw, which is arranged opposite to the pressure bar.

10. The device for measuring the outer diameter of the main connecting rod of an aircraft engine according to claim 8, characterized in that: It also includes a counter-piece, wherein the two sides of the main connecting rod are respectively a first outer cylindrical surface and a second outer cylindrical surface, the second outer cylindrical surface is provided with a chamfered surface, and the outer diameter of the counter-piece is the same as the size of the first outer cylindrical surface.

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