Special parameter measuring device for engine

Abstract

The utility model discloses a special parameter measuring device for an engine, which relates to the field of engine parameter measurement and comprises a main body platform and a C-shaped tool frame, a measuring platform is arranged on the main body platform, and weighing sensors are arranged at four corners of the bottom of the measuring platform. The measuring platform is symmetrically provided with two groups of mass center measuring mechanisms along the axial direction of the C-shaped tool frame, each mass center measuring mechanism comprises a measuring seat and two roller supports, the measuring seat is slidably mounted on the measuring platform, the top of the measuring seat is open, and the two roller supports are mounted in the opening of the measuring seat and are arranged at intervals along the radial direction of the C-shaped tool frame; the C-shaped tool frame comprises two C-shaped pieces, the two C-shaped pieces are located in the openings of the two measuring bases respectively and supported through the roller supports, the two C-shaped pieces are connected together through the connecting rods, the mass center, the rotational inertia and the mass of the engine can be measured without disassembling each part of the engine, the measuring operation is simplified, and the measuring precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of parameter measurement, in particular to a parameter measurement device dedicated to an engine. Background Art

[0002] After developing an engine, the Engine Research Institute cannot accurately know the center of mass, mass, moment of inertia and other parameters of the actual engine. They can only measure the above data in 3D software. However, the actual engines produced often have a certain gap with the theoretical model. In the past, the above data were usually tested by decomposing each component of the engine, and then the corresponding data was recorded. After superposition or some kind of calculation, the center of mass, mass and moment of inertia parameters of the entire engine were obtained. The operation is cumbersome and complicated, and the error after superposition calculation is large. At present, in the field of aviation engines in my country, no multifunctional special equipment for measuring the center of mass, moment of inertia and mass of the aircraft turbofan engine as a whole has been found. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a parameter measuring device dedicated to an engine, so as to solve the deficiencies of the prior art.

[0004] The purpose of the utility model is achieved through the following technical solutions: a parameter measuring device dedicated to an engine, comprising a main platform and a C-shaped fixture frame, a measuring platform is arranged on the main platform, and weighing sensors are arranged at the four corners of the bottom of the measuring platform, and the measuring platform is symmetrically provided with two groups of center of mass measuring mechanisms along the axial direction of the C-shaped fixture frame, and the center of mass measuring mechanism includes a measuring seat and two roller supports, the measuring seat is slidably mounted on the measuring platform, the top of the measuring seat is open, and the two roller supports are mounted in the opening of the measuring seat and are arranged at intervals along the radial direction of the C-shaped fixture frame, the C-shaped fixture frame includes two C-shaped parts, the two C-shaped parts are respectively located in the openings of the two measuring seats and are supported by the roller supports, and the two C-shaped parts are connected together by multiple tie rods.

[0005] Furthermore, a lifting and weighing mechanism is provided in the main platform, and the lifting and weighing mechanism includes four groups of mounting seats, and lifting frames are slidably provided on the four groups of mounting seats, and the four weighing sensors are respectively installed on the top of the four lifting frames.

[0006] Furthermore, a lead screw is rotatably provided on the mounting seat, a lead screw slider is threadedly sleeved on the lead screw, and the lifting frame is connected to the lead screw slider.

[0007] Furthermore, the lifting and weighing mechanism also includes two transmission shafts, both ends of the transmission shaft are rotatably connected to the two sets of mounting seats, both ends of the transmission shaft are connected to a first bevel gear, the lead screw is connected to a second bevel gear, the second bevel gear engages with the first bevel gear, and the two transmission shafts are connected through a driving mechanism, the driving mechanism includes a double-output shaft motor, and the two output shafts of the double-output shaft motor are connected to an output main shaft, one end of the output main shaft is connected to a transmission main shaft through a bevel gear set, and a third bevel gear is mounted on the transmission main shaft, and the third bevel gear engages with the second bevel gear.

[0008] Furthermore, a moment of inertia measuring mechanism is provided on the main platform, and the moment of inertia measuring mechanism includes a photoelectric gate sensor, and the photoelectric gate sensor is installed on a side wall of one of the measuring seats.

[0009] Furthermore, one of the measuring seats is provided with a rolling mechanism, which is used to drive the C-type tooling frame to rotate. The rolling mechanism includes a gear box, a rolling spindle and a column. Both ends of the measuring seat are fixedly connected to the column, and the top of the column is connected to a reciprocating spring. The end of the reciprocating spring away from the column is connected to the C-type tooling frame through a connecting rod. The gear box is installed on the measuring seat, and the rolling spindle is rotatably installed on the measuring seat. One end of the rolling spindle is connected to the input shaft of the gear box, and the other end is connected to the handwheel. The output shaft of the gear box is connected to a driving gear. An arc rack is installed on the C-type tooling frame, and the driving gear engages with the arc rack.

[0010] Furthermore, two guide rails are arranged in parallel on the measuring platform, and a slide block is slidably fitted on the guide rails. The slide block moves along the axial direction of the C-shaped fixture frame, and the slide block is connected to the bottom of the measuring seat.

[0011] Furthermore, a coordinate conversion mechanism is provided on the main platform, and the coordinate conversion mechanism includes a conversion frame, a rotating seat and a length measuring sensor. The conversion frame is installed on the main platform, the rotating seat is rotatably provided on the main platform, and the length measuring sensor is installed on the rotating seat.

[0012] The beneficial effects of the utility model are:

[0013] 1. Only one installation is required to directly measure the center of mass, mass, and moment of inertia parameters of the entire engine.

[0014] 2. The testing requirements of different types of aircraft engines can be met by replacing the installation tooling, without the need to re-purchase special testing equipment for the corresponding engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an exploded schematic diagram of an engine-specific parameter measurement device according to the present invention;

[0016] Figure 2 This is a structural diagram of a lifting and weighing mechanism in an engine-specific parameter measuring device of the utility model;

[0017] Figure 3 This is a structural schematic diagram of a centroid measurement mechanism in an engine-specific parameter measurement device of the utility model;

[0018] In the figure, 1-main platform, 2-measuring platform, 3-measuring seat, 4-roller support, 5-C-shaped part, 6-weighing sensor, 7-pull rod, 10-guide rail, 11-slide block, 12-mounting seat, 13-lifting frame, 14-screw, 15-screw slider, 16-drive shaft, 17-first bevel gear, 18-double-output shaft motor, 19-output spindle, 20-drive spindle, 21-third bevel gear, 22-photoelectric door sensor, 23-gear box, 24-rolling spindle, 25-column, 26-reciprocating spring, 27-connecting rod, 28-drive gear, 29-handwheel, 30-conversion frame, 31-rotating seat, 32-length measuring sensor, 33-arc rack. DETAILED DESCRIPTION

[0019] Example 1

[0020] like Figures 1 to 3As shown, a parameter measuring device dedicated to an engine includes a main platform 1 and a C-shaped fixture. A measuring platform 2 is provided on the main platform 1. Load cells 6 are provided at the four corners of the bottom of the measuring platform 2. The measuring platform 2 is symmetrically provided with two sets of centroid measuring mechanisms along the axial direction of the C-shaped fixture. The centroid measuring mechanisms include a measuring seat 3 and two roller supports 4. The measuring seat 3 is slidably mounted on the measuring platform 2. The top of the measuring seat 3 is open. The two roller supports 4 are mounted in the opening of the measuring seat 3 and are spaced apart along the radial direction of the C-shaped fixture. The C-shaped fixture includes two C-shaped parts 5. The two C-shaped parts 5 are respectively located in the openings of the two measuring seats 3 and are supported by the roller supports 4. The two C-shaped parts 5 are connected together by multiple tie rods 7. The weighing method is used to measure The center of gravity of the object to be measured is to mount the object to be measured on a C-shaped tooling frame, and the weight of the object to be measured is measured by a weighing sensor 6. There are four groups of weighing sensors 6, and the center of mass of the object is determined by the force difference of the four groups of weighing sensors. The weight method of measuring the center of mass of the object is based on the principle of moment balance. Therefore, the position of the object to be measured is adjusted by moving the measuring seat 3. By changing the geometric position of the object to be measured and accurately measuring the changed relative distance, the change value of the position of the original center of mass of the object can be calculated according to the moment balance theory. At the same time, the two center of mass positions before and after the known weight change are measured according to the center of mass measurement mechanism. The difference between the two center of mass measurement values is compared with the theoretical calculated value, and the accuracy of the center of mass measurement mechanism can be conveniently and accurately determined.

[0021] Furthermore, clamping blocks are provided at both ends of the opening of one of the C-shaped members 5 , and the object to be measured is abutted against the clamping blocks by bolts, thereby clamping the object to be measured on the C-shaped fixture frame.

[0022] Example 2

[0023] Based on the first embodiment, Figure 1 and Figure 3As shown, a moment of inertia measuring mechanism is provided on the main platform 1, and the moment of inertia measuring mechanism includes a photoelectric gate sensor 22, and the photoelectric gate sensor 22 is installed on the side wall of one of the measuring seats 3. A rolling mechanism is provided on one of the measuring seats 3, and the rolling mechanism is used to drive the C-type fixture to rotate. The rolling mechanism includes a gear box 23, a rolling spindle 24 and a column 25. Both ends of the measuring seat 3 are fixedly connected to the column 25, and the top of the column 25 is connected to a reciprocating spring 26. The end of the reciprocating spring 26 away from the column 25 is connected to the C-type fixture through a connecting rod 27. The gear box 23 is installed on the measuring seat 3, and the rolling spindle 24 is rotatably installed on the measuring seat 3. One end of the rolling spindle 24 is connected to the input shaft of the gear box 23, and the other end A handwheel 29 is connected, and the output shaft of the gearbox 23 is connected to the drive gear 28. An arc-shaped rack 33 is installed on the C-type fixture, and the drive gear 28 engages with the arc-shaped rack 33. During measurement, the handwheel 29 is manually turned to drive the rolling spindle 24 to rotate, and the spindle 24 drives the drive gear 28 to rotate through the gearbox 23. The drive gear 28 drives the C-type fixture and the object to be measured thereon to tilt through the arc-shaped rack 33. The C-type fixture makes the reciprocating springs 26 at both ends in a stretched state and the other in a compressed state, and then the handwheel 29 is released. Under the reaction force of the reciprocating spring 26, the C-type fixture swings back and forth. By measuring the period and number of times the C-type fixture passes through the photoelectric gate sensor 22, the moment of inertia of the object is calculated. During the rolling process, the test piece is completely fixed to the C-type fixture, with no relative displacement. The measured moment of inertia is the sum of the C-type fixture and the object being tested. The moment of inertia of the object being tested is then subtracted from the C-type fixture's moment of inertia to obtain the moment of inertia of the object being tested. Using the horizontal pendulum method, the test piece is directly supported by roller support 4 during testing. The influence of frictional resistance torque during the pendulum is significant and cannot be ignored. We consulted relevant domestic and international data, comprehensively considering the impact of frictional resistance torque on the measurement accuracy of the horizontal pendulum method. We established a vibration equation for the horizontal pendulum method that includes a frictional resistance torque term and provided a calculation method. Analysis of the solution to this equation revealed the changing trends in the periodic measurement values of the photoelectric gate sensor at different positions between two static equilibrium positions. This significantly improves the installation of the photoelectric gate sensor and the measurement accuracy of the X-axis moment of inertia.

[0024] Assume that the system's no-load X-axis moment of inertia is J0, the X-axis moment of inertia and measured period of standard part 1 are JS1 and T1 respectively, the X-axis moment of inertia and measured period of standard part 2 are JS2 and T2 respectively, and the X-axis moment of inertia and measured period of the measured part are Jd and Td respectively.

[0025]

[0026] Solving the above equations, we can get the calibrated torsion pendulum stiffness coefficient:

[0027]

[0028] The X-axis moment of inertia of the measured object is:

[0029] Take the average

[0030]

[0031] Example 3

[0032] Based on the second embodiment, Figure 1 and Figure 2 As shown, a lifting and weighing mechanism is provided in the main platform 1, which includes four groups of mounting seats 12, on which a lifting frame 13 is slidingly provided. Four weighing sensors 6 are respectively installed on the top of the four lifting frames 13, and a lead screw 14 is rotatably provided on the mounting seat 12. A lead screw slider 15 is threadedly sleeved on the lead screw 14, and the lifting frame 13 is connected to the lead screw slider 15. The lifting and weighing mechanism also includes two transmission shafts 16, and both ends of the transmission shaft 16 are rotatably connected to the two groups of mounting seats 12. Both ends of the transmission shaft 16 are connected to a first bevel gear 17, and the lead screw 14 is connected to a second bevel gear. The second bevel gear meshes with the first bevel gear 17. The two transmission shafts 16 are connected through a driving mechanism, and the driving mechanism includes a double-output shaft motor 18. The two output shafts of the double-output shaft motor 18 are connected to an output main shaft 19. One end of the output main shaft 19 is connected to a transmission main shaft 20 through a bevel gear set. The transmission main shaft 20 is sleeved with a third bevel gear 21. The three-bevel gear 21 meshes with the second bevel gear. During weighing, the double-output shaft motor 18 drives the two output main shafts 19 to rotate. The output main shaft 19 drives the transmission main shaft 20 to rotate through the bevel gear set. The transmission main shaft 20 drives the lead screws 14 on two sets of mounting seats 12 to rotate through the meshing of the third bevel gear 21 and the second bevel gear. At the same time, the meshing of the second bevel gear and the first bevel gear 17 drives the transmission shaft 16 to rotate. The transmission shaft 16 drives the lead screws 14 on the other two sets of mounting seats 12 to rotate through the meshing of the first bevel gear 17 and the second bevel gear, so that the lead screw slider 15 drives the lifting frame 13 to move upward, so that the four weighing sensors 6 all move upward and extend from the top of the main platform 1 to support the measuring platform 2 to measure the weight of the object to be measured. When measuring the moment of inertia, the double-output shaft motor 18 rotates in the opposite direction, so that the lifting frame 13 drives the weighing sensor 6 to move downward, so that the measuring platform 2 contacts the main platform 1, and the measuring platform 2 is supported by the main platform 1. The bevel gear set includes two bevel gears meshing with each other, and the two bevel gears are respectively connected to the output main shaft 19 and the transmission main shaft 20.

[0033] Furthermore, two guide rails 10 are arranged in parallel on the measuring platform 2, and a slide block 11 is slidably fitted on the guide rail 10. The slide block 11 moves along the axial direction of the C-shaped tooling frame. The slide block 11 is connected to the bottom of the measuring seat 3. The moving direction of the object to be measured is guided by the cooperation between the slide block 11 and the guide rail 10 to change the position of the object to be measured to measure the center of mass.

[0034] Example 4

[0035] Based on the third embodiment, Figure 1 As shown, the main platform 1 is provided with a coordinate conversion mechanism, which includes a conversion frame 30, a rotating base 31, and a length measuring sensor 32. The conversion frame 30 is mounted on the main platform 1, and the rotating base 31 is rotatably mounted on the main platform 1. The length measuring sensor 32 is mounted on the rotating base 31. The length measuring sensor 32 measures the size of the object being measured. The rotating base 31 is used to change the position of the length measuring sensor 32, that is, to rotate the length measuring sensor 32 90 degrees, so that the X-axis and Y-axis lengths of the object being measured are measured. The length is measured in the X direction, and the width is measured in the Y direction. The coordinate height is fixed in the Z direction and is located at the center of the cross-sectional circle. The left-right swing in the above-mentioned embodiment 2 can only measure the moment of inertia in the X direction. Through this coordinate mechanism and mass measurement, the center of mass of the object being measured can be calculated. The geometric distribution of the center of mass can directly determine the moment of inertia in the Y direction. The moment of inertia in the Z direction is measured by reciprocating swing around the Z axis.

Claims

1. A parameter measuring device dedicated to an engine, comprising a main platform (1) and a C-shaped fixture frame, characterized in that: A measuring platform (2) is provided on the main platform (1), and weighing sensors (6) are provided at the four corners of the bottom of the measuring platform (2). The measuring platform (2) is symmetrically provided with two sets of centroid measuring mechanisms along the axial direction of the C-shaped fixture frame. The centroid measuring mechanisms include a measuring seat (3) and two roller supports (4). The measuring seat (3) is slidably mounted on the measuring platform (2). The top of the measuring seat (3) is open. The two roller supports (4) are installed in the opening of the measuring seat (3) and are spaced apart along the radial direction of the C-shaped fixture frame. The C-shaped fixture frame includes two C-shaped parts (5). The two C-shaped parts (5) are respectively located in the openings of the two measuring seats (3) and are supported by the roller supports (4). The two C-shaped parts (5) are connected together by multiple tie rods (7).

2. The engine-specific parameter measuring device according to claim 1, characterized in that: A lifting and weighing mechanism is provided in the main platform (1), and the lifting and weighing mechanism includes four groups of mounting seats (12). Lifting frames (13) are slidably provided on the four groups of mounting seats (12), and the four weighing sensors (6) are respectively installed on the top of the four lifting frames (13).

3. The engine-specific parameter measuring device according to claim 2, characterized in that: A lead screw (14) is rotatably provided on the mounting seat (12), a lead screw slider (15) is threadedly sleeved on the lead screw (14), and the lifting frame (13) is connected to the lead screw slider (15).

4. The engine-specific parameter measuring device according to claim 3, characterized in that: The lifting and weighing mechanism further comprises two transmission shafts (16), both ends of the transmission shafts (16) are rotatably connected to the two sets of mounting seats (12), both ends of the transmission shafts (16) are connected to a first bevel gear (17), the lead screw (14) is connected to a second bevel gear, the second bevel gear engages with the first bevel gear (17), the two transmission shafts (16) are connected through a driving mechanism, the driving mechanism comprises a double-output shaft motor (18), the two output shafts of the double-output shaft motor (18) are connected to an output main shaft (19), one end of the output main shaft (19) is connected to a transmission main shaft (20) through a bevel gear set, the transmission main shaft (20) is sleeved with a third bevel gear (21), the third bevel gear (21) engages with the second bevel gear.

5. The engine-specific parameter measuring device according to claim 1, characterized in that: A moment of inertia measuring mechanism is provided on the main platform (1), and the moment of inertia measuring mechanism includes a photoelectric door sensor (22). The photoelectric door sensor (22) is installed on a side wall of one of the measuring seats (3).

6. The engine-specific parameter measuring device according to claim 1, characterized in that: A rolling mechanism is provided on one of the measuring seats (3), and the rolling mechanism is used to drive the C-shaped tooling frame to rotate. The rolling mechanism includes a gear box (23), a rolling spindle (24) and a column (25). Both ends of the measuring seat (3) are fixedly connected to the column (25). The top of the column (25) is connected to a reciprocating spring (26). The end of the reciprocating spring (26) away from the column (25) is connected to the C-shaped tooling frame through a connecting rod (27). The gear box (23) is mounted on the measuring seat (3), the rolling spindle (24) is rotatably mounted on the measuring seat (3), one end of the rolling spindle (24) is connected to the input shaft of the gear box (23), and the other end is connected to a hand wheel (29), the output shaft of the gear box (23) is connected to a driving gear (28), an arc-shaped rack (33) is mounted on the C-shaped fixture, and the driving gear (28) is engaged with the arc-shaped rack (33).

7. The engine-specific parameter measuring device according to claim 1, characterized in that: Two guide rails (10) are arranged in parallel on the measuring platform (2), and a slide block (11) is slidably matched on the guide rail (10). The slide block (11) moves along the axial direction of the C-shaped fixture frame, and the slide block (11) is connected to the bottom of the measuring seat (3).

8. The engine-specific parameter measuring device according to claim 1, characterized in that: A coordinate conversion mechanism is provided on the main platform (1), the coordinate conversion mechanism comprising a conversion frame (30), a rotating seat (31) and a length measuring sensor (32); the conversion frame (30) is mounted on the main platform (1); the rotating seat (31) is rotatably provided on the main platform (1); and the length measuring sensor (32) is mounted on the rotating seat (31).

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