CN111256988B - Load loading device and method for strength test of low-pressure compressor shaft of engine - Google Patents
Load loading device and method for strength test of low-pressure compressor shaft of engine Download PDFInfo
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- CN111256988B CN111256988B CN202010246976.2A CN202010246976A CN111256988B CN 111256988 B CN111256988 B CN 111256988B CN 202010246976 A CN202010246976 A CN 202010246976A CN 111256988 B CN111256988 B CN 111256988B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
Abstract
The invention discloses a loading device and a method for a load of a low-pressure compressor shaft strength test of an engine, wherein a fixed head frame with one end serving as a stepped shaft is used as a supporting and positioning part, a front joint section is sleeved on the stepped shaft of the fixed head frame, one end of the front joint section is contacted with a stepped shaft shoulder of the fixed head frame, a shaft test piece to be tested is axially positioned and installed on the fixed head frame by using a front bearing cylinder, a thrust ball bearing is arranged between one end part of a bearing installation inner sleeve and the end surface of a concave table of the front bearing cylinder, so that the installation stability of the shaft test piece to be tested can be ensured, the device has a compact structure and is easy to install and adjust, the tensile and torsional loads of a tester can be transmitted to the test piece by the device, the aim of checking the fatigue life of the shaft test piece under the combined action of the tensile and torsional loads is fulfilled, and the technical problem that the torque loads, the axial, the authenticity and the accuracy of the test result are ensured.
Description
Technical Field
The invention belongs to the technical field of aero-engine tests, and particularly relates to a load loading device and method for a low-pressure compressor shaft strength test of an engine.
Background
The rear shaft of the low-pressure compressor of the engine is an extremely important bearing component of the aeroengine, plays an extremely important role in the aeroengine structure, plays a supporting role, and supports parts of the low-pressure compressor through a bearing arranged on the rear shaft; meanwhile, the power transmission device also plays a role in transmitting power, and the power is transmitted to the compressor component arranged on the power transmission device through the spline on the shaft. In order to verify the reasonability and strength reserve of the structural design of the rear shaft part of the engine, the test is required to verify, and a test basis is provided for the design and service life evaluation of the part. The shaft part of the aero-engine has the structural characteristics that the major diameter is large, when the aero-engine works, the shaft bears the axial force generated by aerodynamic force, and simultaneously bears the torque generated by the reaction force of gas on blades and the vibration load generated by vibration of the blades, the loads need to be applied simultaneously during testing, mutual interference among the loads is easy to generate, and the problem needs to be solved through reasonable design of a testing device.
Disclosure of Invention
The invention aims to provide a load loading device and method for a low-pressure compressor shaft strength test of an engine, so as to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a load loading device for a strength test of a low-pressure compressor shaft of an engine comprises a fixed head frame, a front rotary joint section, a bearing mounting inner sleeve and a front bearing cylinder, wherein one end of the fixed head frame is a stepped shaft, the front rotary joint section is sleeved on the stepped shaft of the fixed head frame, one end of the front rotary joint section is in contact with a shaft shoulder of the stepped shaft of the fixed head frame, and the other end of the front rotary joint section is provided with a curved tooth structure I meshed with a curved tooth II on the end face of one end of a test piece of a shaft to be tested; the front bearing cylinder is provided with an axial through hole, a concave table is arranged in the axial through hole, a bearing installation inner sleeve is sleeved in the front bearing cylinder, a thrust ball bearing is arranged between the end part of one end of the bearing installation inner sleeve and the end surface of the concave table of the front bearing cylinder, and the other end of the bearing installation inner sleeve is contacted with the back surface of an end surface arc tooth II on the shaft test piece to be tested; a key groove used for being in key connection with the outer wall of the shaft test piece to be tested is arranged in the middle of the bearing mounting inner sleeve; the outer ring of the fixed headstock is provided with a connecting flange part, and one end of the front bearing cylinder is fixedly connected with the connecting flange part at one end of the fixed headstock; the other end of the shaft test piece to be tested is fixedly connected with the shaft tester.
Furthermore, a distance sleeve is arranged between one end of the front bearing cylinder and the connecting flange part at one end of the fixed head frame.
Further, the distance sleeve is sleeved in a flange connecting hole of the front adapter section, or the distance sleeve is arranged between the front adapter section and the front bearing cylinder.
Furthermore, the other end of the shaft test piece to be tested is fixedly connected with the shaft tester through the tester tail frame.
Furthermore, the tester tailstock and the shaft tester are of an integrated structure.
Furthermore, the other end of the shaft test piece to be tested is provided with a connecting flange, and the connecting flange of the shaft test piece to be tested is fixedly connected with a tail frame of the tester through a screw
Furthermore, a plurality of connecting holes are formed in the circumferential direction of the connecting flange part at one end of the fixed head frame.
Furthermore, one end of the front bearing cylinder is fixedly connected with the connecting flange part at one end of the fixed head frame through a bolt group.
Furthermore, an inner chamfer is arranged at one end of the front rotary joint section, which is in contact with the test piece of the shaft to be tested.
A method for loading strength load of a low-pressure compressor shaft of an engine comprises the following steps:
step 1), sequentially sleeving a thrust ball bearing and a bearing installation inner sleeve in a front bearing cylinder, and sleeving a front adapter section on a stepped shaft of a fixed head frame;
step 2), then mounting a combined piece of the thrust bearing, the bearing mounting inner sleeve and the front bearing cylinder on an external spline at the front end of the shaft test piece to be tested, so that an internal spline III on the bearing mounting inner sleeve is meshed with an external spline IV at the front end of the shaft test piece to be tested, and meanwhile, a step hole at one end of the bearing mounting inner sleeve props against the back surface of the end surface arc tooth II;
and 3) engaging the end face arc teeth I of the front rotary joint section with the end face arc teeth II on the shaft test piece, fixedly connecting the front bearing cylinder with the fixed head frame, and finally fixedly connecting the rear end of the shaft test piece with the shaft tester, and applying an axial load to the shaft test piece to be tested under the action of the shaft tester, thereby realizing the strength test load test of the shaft test piece to be tested.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a load loading device for a shaft strength test of a low-pressure compressor of an engine, which is characterized in that a fixed headstock with one end serving as a stepped shaft is used as a supporting and positioning part, a front rotary joint section is sleeved on the stepped shaft of the fixed headstock, one end of the front rotary joint section is contacted with a stepped shaft shoulder of the fixed headstock, and the other end of the front rotary joint section is provided with a curved tooth structure I meshed with a curved tooth II on the end surface of one end of a test piece of a shaft to be tested; the method comprises the following steps that a front bearing cylinder is utilized to axially position and install a to-be-tested shaft test piece on a fixed head frame, a thrust ball bearing is arranged between the end part of one end of a bearing installation inner sleeve and the end face of a concave table of the front bearing cylinder, the other end of the bearing installation inner sleeve is in contact with the back face of an end face arc tooth II on the to-be-tested shaft test piece, the installation stability of the to-be-tested shaft test piece can be ensured, and a key groove used for being in key connection with the outer wall of the; the outer ring of the fixed headstock is provided with a connecting flange part, and one end of the front bearing cylinder is fixedly connected with the connecting flange part at one end of the fixed headstock; the other end of the shaft test piece to be tested is fixedly connected with the shaft tester; the device is compact in structure and easy to install and adjust, the tensile load and the torsional load of the tester can be transmitted to the test piece through the device, the purpose of checking the fatigue life of the shaft test piece under the combined action of the tensile load and the torsional load is achieved, the axial load, the torque load and the vibration load of the rear shaft test piece are simultaneously and independently applied, the technical problem that the torque load, the axial load and the vibration load are simultaneously applied to the mutual interference of the test piece is solved, the application of the load can be accurately and accurately realized, and the authenticity and the accuracy of a test result are guaranteed.
The invention relates to a method for loading the strength load of a shaft of a low-pressure compressor of an engine, which realizes the strength test load test of a shaft test piece to be tested by utilizing the device and has the advantages of simple method and accurate measurement result.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Wherein, 1, front switching section; 2. a distance sleeve; 3. an inner sleeve is arranged on the bearing; 4. a front bearing cylinder; a. fixing the head frame; b. a nut; c. a bolt; d. a thrust ball bearing; e. a shaft test piece to be measured; f. a screw; g. a tester tailstock; h. a shaft tester.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the load loading device for the strength test of the low-pressure compressor shaft of the engine comprises a fixed head frame a, a front rotary joint section 1, a bearing installation inner sleeve 3 and a front bearing cylinder 4, wherein one end of the fixed head frame a is a stepped shaft, the front rotary joint section 1 is sleeved and fixed on the stepped shaft of the fixed head frame a, one end of the front rotary joint section 1 is in contact with a shaft shoulder of the stepped shaft of the fixed head frame a, and the other end of the front rotary joint section 1 is provided with an arc tooth structure I meshed with an end face arc tooth II at one end of a test piece e of a shaft to be; the front bearing cylinder 4 is provided with an axial through hole, a concave platform is arranged in the axial through hole, the bearing installation inner sleeve 3 is sleeved in the front bearing cylinder 4, a thrust ball bearing d is arranged between the end part of one end of the bearing installation inner sleeve 3 and the end surface of the concave platform of the front bearing cylinder 4, and the other end of the bearing installation inner sleeve 3 is contacted with the back surface of an end surface arc tooth II on a shaft test piece e to be tested; a key groove used for being in key connection with the outer wall of a shaft test piece e to be tested is formed in the middle of the bearing mounting inner sleeve 3; the outer ring of the fixed head frame a is provided with a connecting flange part, one end of the front bearing cylinder 4 is fixedly connected with the connecting flange part at one end of the fixed head frame a, and flange connecting holes are formed in the connecting flange parts of the front bearing cylinder 4 and the fixed head frame a; the other end of the shaft test piece e to be tested is fixedly connected with the shaft tester h. The front adapter section 1 is positioned between the front bearing cylinder 4 and the fixed head frame a, and the front adapter section 1 is tightly pressed and fixed with the fixed head frame a through the front bearing cylinder 4; the outer side of the front adapter section 1 is provided with a flange connecting hole, and the flange connecting hole of the front adapter section 1 is coaxial with the flange connecting holes of the front bearing cylinder 4 and the fixed head frame a.
A distance sleeve 2 is arranged between one end of the front bearing cylinder 4 and the connecting flange part at one end of the fixed head frame a; the distance sleeve 2 is sleeved in a flange connecting hole of the front adapter section 1, or the distance sleeve 2 is arranged between the front adapter section 1 and the front bearing cylinder 4. The contact end of the front switching section 1 and the shaft test piece e to be tested is provided with an inner chamfer, so that the contact area of the arc teeth between the front switching section 1 and the shaft test piece e to be tested is ensured, and the test precision of the arc tooth strength of the end surface is improved.
The other end of the shaft test piece e to be tested is fixedly connected with a shaft tester h through a tester tail frame g, and the tester tail frame g is fixed on the shaft tester h. The other end of the shaft test piece e to be tested is provided with a connecting flange, the connecting flange of the shaft test piece e to be tested is fixedly connected with a tail frame g of the tester through a screw f, the structure is simple, the connection is stable, the device is suitable for various different structures, is convenient to detach, and can simultaneously transmit torque load, axial load and vibration load.
The connecting flange part at one end of the fixed head frame a is circumferentially provided with a plurality of connecting holes, and one end of the front bearing cylinder 4 is matched and fastened with the connecting flange part at one end of the fixed head frame a through a bolt c and a nut b.
When in use, the thrust ball bearing d and the bearing mounting inner sleeve 3 are sequentially sleeved in the front bearing cylinder 4; then, mounting a combined piece of a thrust bearing d, a bearing mounting inner sleeve 3 and a front bearing barrel 4 on an external spline at the front end of a shaft test piece e to be tested, so that an internal spline III on the bearing mounting inner sleeve 3 is meshed with an external spline IV at the front end of the shaft test piece e to be tested, and meanwhile, a step hole at one end of the bearing mounting inner sleeve 3 props against the back of an end face arc tooth II; sleeving the front switching section 1 on a stepped shaft of the fixed headstock a, and matching an end face arc tooth I of the front switching section 1 with an end face arc tooth II on a shaft test piece; then the front bearing cylinder 4 is fixedly connected with the fixed head frame a, when the front bearing cylinder 4 is fixed, a distance sleeve 2 can be arranged between the front bearing cylinder 4 and the fixed head frame a, and the distance sleeves 2 with different lengths are used for ensuring that the meshing of the end face arc tooth pairs I and II reaches the required meshing state; connecting the whole assembly with a tester headstock a by using a nut b and a bolt c to complete the assembly of the front end; and connecting the flange edge at the rear end of the shaft test piece with a tail frame g of the tester by using a screw f to complete the connection of the rear end.
During testing, the fixed head frame a of the tester is fixed, the shaft tester h moves along the direction I in the figure 1 to stretch the shaft test piece e to be tested, the stretching load jointly acts on the whole shaft test piece e to be tested through the shaft test piece e to be tested, the front bearing cylinder 4, the distance sleeve 2, the bearing mounting inner sleeve 3 and the thrust ball bearing d, and the stretching load is applied to the shaft test piece e to be tested; the shaft tester h can rotate around the central shaft along the direction shown in figure 1 to apply torque and vibration load, and the torque and the vibration load act on the end face arc teeth I and II at the front end of the test piece through the rear shaft test piece; the bearing has the effect that applied torque, vibration load and tensile load can be simultaneously applied to the end face arc teeth I and II without mutual interference, and the purpose of checking the strength of the end face arc teeth is achieved.
Claims (10)
1. A load loading device for a strength test of a shaft of a low-pressure compressor of an engine is characterized by comprising a fixed head frame (a), a front rotary joint section (1), a bearing installation inner sleeve (3) and a front bearing cylinder (4), wherein one end of the fixed head frame (a) is a stepped shaft, the front rotary joint section (1) is sleeved and fixed on the stepped shaft of the fixed head frame (a), one end of the front rotary joint section (1) is in contact with a shoulder of the stepped shaft of the fixed head frame (a), and the other end of the front rotary joint section (1) is provided with an arc tooth structure I meshed with an arc tooth II at one end face of a test piece (e) of a shaft to be tested; the front bearing cylinder (4) is provided with an axial through hole, a concave table is arranged in the axial through hole, a bearing mounting inner sleeve (3) is sleeved in the front bearing cylinder (4), a thrust ball bearing (d) is arranged between the end part of one end of the bearing mounting inner sleeve (3) and the end surface of the concave table of the front bearing cylinder (4), and the other end of the bearing mounting inner sleeve (3) is contacted with the back surface of an end surface arc tooth II on a shaft test piece (e) to be tested; a key groove used for being in key connection with the outer wall of the shaft test piece (e) to be tested is arranged in the middle of the bearing mounting inner sleeve (3); the outer ring of the fixed head frame (a) is provided with a connecting flange part, and one end of the front bearing cylinder (4) is fixedly connected with the connecting flange part at one end of the fixed head frame (a); the other end of the shaft test piece (e) to be tested is fixedly connected with the shaft tester (h).
2. The loading device for the strength test load of the shaft of the low-pressure compressor of the engine as claimed in claim 1, wherein a distance sleeve (2) is arranged between one end of the front bearing cylinder (4) and the connecting flange part at one end of the fixed head frame (a).
3. The load loading device for the strength test of the shaft of the low-pressure compressor of the engine as claimed in claim 2, wherein the distance sleeve (2) is sleeved in a flange connecting hole of the front adapter section (1), or the distance sleeve (2) is arranged between the front adapter section (1) and the front bearing cylinder (4).
4. The loading device for the strength test load of the shaft of the low-pressure compressor of the engine as claimed in claim 1, wherein the other end of the shaft test piece (e) to be tested is fixedly connected with the shaft tester (h) through a tester tailstock (g).
5. The loading device for the shaft strength test of the low-pressure compressor of the engine as claimed in claim 4, wherein the tester tailstock (g) and the shaft tester (h) are of an integral structure.
6. The loading device for the strength test load of the shaft of the low-pressure compressor of the engine as claimed in claim 4, wherein the other end of the shaft test piece (e) to be tested is provided with a connecting flange, and the connecting flange of the shaft test piece (e) to be tested is fixedly connected with a tail frame (g) of the tester through a screw (f).
7. The loading device for the shaft strength test of the low-pressure compressor of the engine as claimed in claim 1, wherein a plurality of connecting holes are formed in the circumferential direction of the connecting flange portion at one end of the fixing head frame (a).
8. The loading device for the strength test load of the shaft of the low-pressure compressor of the engine as claimed in claim 7, wherein one end of the front bearing cylinder (4) is fixedly connected with the connecting flange part at one end of the fixed head frame (a) through a bolt group.
9. The loading device for the strength test load of the shaft of the low-pressure compressor of the engine as claimed in claim 1, wherein an inner chamfer is arranged at one end of the front rotary joint section (1) which is in contact with the test piece (e) of the shaft to be tested.
10. A method for loading a shaft strength load of a low-pressure compressor of an engine based on the load loading device of claim 1, comprising the steps of:
step 1), sequentially sleeving a thrust ball bearing and a bearing installation inner sleeve in a front bearing cylinder, and sleeving a front adapter section on a stepped shaft of a fixed head frame;
step 2), then mounting a combined piece of the thrust bearing, the bearing mounting inner sleeve and the front bearing cylinder on an external spline at the front end of the shaft test piece to be tested, so that an internal spline III on the bearing mounting inner sleeve is meshed with an external spline IV at the front end of the shaft test piece to be tested, and meanwhile, a step hole at one end of the bearing mounting inner sleeve props against the back surface of the end surface arc tooth II;
and 3) engaging the end face arc teeth I of the front rotary joint section with the end face arc teeth II on the shaft test piece, fixedly connecting the front bearing cylinder with the fixed head frame, and finally fixedly connecting the rear end of the shaft test piece with the shaft tester, and applying an axial load to the shaft test piece to be tested under the action of the shaft tester, thereby realizing the strength test load test of the shaft test piece to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246976.2A CN111256988B (en) | 2020-03-31 | 2020-03-31 | Load loading device and method for strength test of low-pressure compressor shaft of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246976.2A CN111256988B (en) | 2020-03-31 | 2020-03-31 | Load loading device and method for strength test of low-pressure compressor shaft of engine |
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| Publication Number | Publication Date |
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| CN111256988A CN111256988A (en) | 2020-06-09 |
| CN111256988B true CN111256988B (en) | 2021-07-06 |
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