CN110907266A - Loading method and loading equipment for fatigue test - Google Patents
Loading method and loading equipment for fatigue test Download PDFInfo
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- CN110907266A CN110907266A CN201911289027.6A CN201911289027A CN110907266A CN 110907266 A CN110907266 A CN 110907266A CN 201911289027 A CN201911289027 A CN 201911289027A CN 110907266 A CN110907266 A CN 110907266A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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Abstract
A loading method and loading equipment for fatigue test, the loading equipment contains loading device and power device, the loading device contains displacement limiting base, loading platform, loading mass block, the loading platform has multiple displacement pulley, the displacement pulley matches with vertical slide rail on the displacement limiting base, the upper end of the loading platform has traction point, the power device contains motor and cam, the cam locates on the transmission shaft of the motor, the cam matches with the transmission pulley at the bottom of the loading platform, the motor drives the loading platform to move up and down along the vertical slide rail through the cam; the device comprises a traction rope for transmitting load, wherein a force sensor is arranged on the traction rope, one end of the traction rope is connected with a traction point of a loading platform, the other end of the traction rope is connected with a fatigue test piece, the loading platform is driven to move up and down along a vertical sliding rail through a cam on a transmission shaft, and the loading platform transmits the fatigue load to the fatigue test piece through the traction rope.
Description
Technical Field
The invention belongs to the field of design of airplane fatigue tests, and particularly relates to a loading method and a loading device for performing fatigue tests on airplane parts.
Background
For fatigue tests of large aircraft parts, hydraulic rams are generally used for loading. For fatigue tests of some parts, the range of the hydraulic actuator cylinder is large, the fatigue test load of the parts is small, so that the error of the loading load is overlarge, and the loading test of the hydraulic actuator cylinder is complex and high in cost. Small-sized parts can be loaded by a fatigue testing machine, but for parts with relatively large sizes, the parts cannot be fixed on the fatigue testing machine for loading.
For the fatigue test of large-size and small-load airplane parts, a fatigue test loading device which can ensure high loading precision, does not limit the sizes of the parts, is simple and is convenient to maintain is urgently needed.
Disclosure of Invention
The application aims to design a loading method and a loading device for carrying out fatigue tests on large-size and small-load parts in the fatigue tests of the airplane parts.
The technical scheme adopted by the invention is as follows: a loading method for a fatigue test is characterized by comprising the following steps: 1) the loading device comprises a loading device and a power device, wherein the loading device comprises a displacement limiting base, a loading platform and a loading mass block, the displacement limiting base comprises a plurality of parallel vertical slide rails, the loading platform is provided with a plurality of displacement pulleys, the displacement pulleys are matched with the vertical slide rails on the displacement limiting base, so that the loading platform can move up and down along the vertical slide rails, the bottom of the loading platform is provided with a transmission pulley, the upper end of the loading platform is provided with a traction point, the loading mass block can be placed on the loading platform, the power device comprises a motor and a cam, the cam is positioned on a transmission shaft of the motor, the cam is matched with the transmission pulley at the bottom of the loading platform, and the motor drives the loading platform to move up and down along the vertical slide rails through the cam; 2) the device comprises a traction rope for transmitting load, wherein a force sensor is arranged on the traction rope, one end of the traction rope is connected with a traction point of a loading platform, and the other end of the traction rope is connected with a fatigue test piece; 3) placing a loading mass block matched with the fatigue load on the loading platform; 4) the rotating speed of the transmission shaft of the motor is adjusted to adapt to the loading frequency of the fatigue load, the cam on the transmission shaft drives the loading platform to move up and down along the vertical sliding rail, and the loading platform transmits the fatigue load to the fatigue test piece through the traction rope.
The application still provides a fatigue test's loading equipment, a serial communication port, this loading equipment contains loading device and power device, loading device contain displacement restriction base, loading platform, loading mass piece, displacement restriction base contain the perpendicular slide rail of a plurality of parallels, loading platform is equipped with a plurality of displacement pulleys, this displacement pulley matches with the perpendicular slide rail on the displacement restriction base, makes loading platform can follow perpendicular slide rail up-and-down motion, is equipped with the transmission pulley in loading platform's bottom, loading platform upper end is equipped with the traction point, loading mass piece can place on loading platform, power device contain motor and cam, the cam is located the transmission shaft of motor, the cam matches with the transmission pulley of loading platform bottom, the motor passes through the cam and drives loading platform along perpendicular slide rail up-and-down motion.
According to the method, the loading mass block is placed at the gravity center position of the loading platform, and the size of the loading load is controlled by adjusting the total mass of the loading mass block; the cam is driven by the motor and loading frequency is controlled, when the long shaft of the cam is positioned at the bottom end, the loading platform is positioned at the lowest position, the cam is separated from the transmission pulley, the traction rope is subjected to the maximum load to complete loading of the load, when the long shaft of the cam is positioned at the top end, the loading platform is positioned at the highest position, the cam is in contact with the transmission pulley, the traction rope is not subjected to the load, and releasing of the load is completed; the transmission pulley rolls on the cam through the rotation of the cam, so that the loading platform repeatedly moves up and down, and further the repeated loading of the fatigue load is completed; the gravity load is converted into a loading load through the diverting pulley, the loading of the fatigue test piece is completed, and the load is fed back in real time through the force sensor.
The beneficial effect of this application lies in: the loading mass block is used for controlling the size of the loading load, so that the load error is reduced; 2) the loading frequency is controlled by adjusting the rotating speed of the motor; 3) loads in any direction can be applied to complex airplane parts through the diverting pulleys; 4) the loading equipment has simple structure, convenient maintenance and high reliability.
The invention is further illustrated with reference to the following figures and examples.
Drawings
Fig. 1 is a schematic view of a loading method of a fatigue test.
Fig. 2 is a schematic structural diagram of a loading device for a fatigue test.
Fig. 3 is a schematic structural view of a displacement limiting base.
Fig. 4 is a schematic structural view of the loading platform.
Fig. 5 is a bottom structure diagram of the loading platform.
Fig. 6 is a schematic structural diagram of the power device.
The numbering in the figures illustrates: the device comprises a displacement limiting base 1, a vertical sliding rail 2, a loading platform 3, a displacement pulley 4, a loading mass block 5, a traction point 6, a connecting lug 7, a motor 8, a transmission shaft 9, a cam 10, a traction rope 11, a force sensor 12, a steering pulley 13, a fatigue test piece 14 and a transmission pulley 15.
Detailed Description
Referring to the attached drawings, the application provides a loading device for a fatigue test, which comprises a loading device and a power device, the loading device comprises a displacement limiting base 1, a loading platform 3 and a loading mass block 5, wherein the displacement limiting base 1 comprises a plurality of parallel vertical slide rails 2, the loading platform 3 is provided with a plurality of displacement pulleys 4, the displacement pulley 4 is matched with the vertical slide rail 2 on the displacement limiting base 1, so that the loading platform 3 can move up and down along the vertical slide rail 2, the bottom of the loading platform 3 is provided with a transmission pulley 15, the upper end of the loading platform 3 is provided with a traction point 6, the loading mass block 5 can be placed on the loading platform 3, the power device comprises a motor 8 and a cam 10, the cam 10 is positioned on a transmission shaft 9 of the motor 8, the cam 10 is matched with a transmission pulley 15 at the bottom of the loading platform 3, and the motor 8 drives the loading platform 3 to move up and down along the vertical slide rail 2 through the cam 10.
In implementation, the displacement limiting base 1 is a square frame structure and includes a base and four vertical sliding rails 2 perpendicular to the base, the four vertical sliding rails 2 are respectively located at four corners of the base, and each vertical sliding rail 2 includes two sliding rail surfaces perpendicular to each other.
The loading platform 3 matched with the displacement limiting base 1 is a square platform, a group of displacement pulleys 4 are arranged at four corners of the square platform respectively, each group of displacement pulleys 4 comprises displacement pulleys 4 which are positioned at two sides of the corners of the square platform and are in different directions, and each group of displacement pulleys 4 corresponds to two sliding rail surfaces of one vertical sliding rail 2 on the displacement limiting base 1 respectively.
In order to balance the stress of the traction point 6 at the upper end of the loading platform 3, the upper ends of the four corners of the loading platform 3 are respectively provided with a connecting lug 7, the connecting lugs 7 are provided with connecting holes, and each connecting lug 7 is converged on the traction point 6 of the loading platform 3 through a rope.
Two identical cams 10 are arranged on a transmission shaft 9 of a motor 8 of the power device. In order to reduce the rotating friction of the power device cam, two groups of transmission pulleys 15 are symmetrically distributed on the bottom central line of the loading platform 3, each group of transmission pulleys 15 is provided with two pulleys which are axially parallel, and the distance between the two groups of transmission pulleys is equal to the distance between the two cams 10 on the motor transmission shaft.
When the loading device is used for loading tests, a traction rope 11 for transmitting loads needs to be arranged, a force sensor 12 is arranged on the traction rope 11, and the force sensor 12 is used for sensing the size of the loads. In practice the traction ropes 11 can connect the traction point 6 of the loading platform 3 to the fatigue test piece 14 via a diverting pulley 13. One end of a hauling cable 11 is connected with the hauling point 6 of the loading platform 3, and the other end of the hauling cable 11 is connected with a fatigue test piece 14. One outstanding point of the application is that a loading mass block 5 matched with fatigue load is arranged on a loading platform 3, so that the load size in the test can be accurately controlled; the loading frequency of the fatigue load is adapted by adjusting the rotating speed of the motor transmission shaft 9; the loading platform 3 is driven by a cam 10 on a transmission shaft 9 of a motor 8 to move up and down along the vertical slide rail 2, and the loading platform 3 transmits fatigue load to a fatigue test piece 14 through a traction rope 11.
According to the method, the loading mass block 5 is placed at the gravity center position of the loading platform 3, and the size of the loading load is controlled by adjusting the total mass of the loading mass block 5; the cam 10 is rotated through the motor 8 and the loading frequency is controlled, when the long axis of the cam 10 is positioned at the bottom end, the loading platform 3 is positioned at the lowest position, the cam 10 is separated from the transmission pulley 15, the traction rope 11 is subjected to the maximum load to complete the loading of the load, when the long axis of the cam 10 is positioned at the top end, the loading platform 3 is positioned at the highest position, the cam 10 is in contact with the transmission pulley 15, the traction rope 11 is not subjected to the load to complete the release of the load; the cam 10 rotates, the transmission pulley 15 rolls on the cam 10, so that the loading platform repeatedly moves up and down, and further the repeated loading of the fatigue load is completed; the gravity load is converted into a loading load through the diverting pulley 13, the loading of the fatigue test piece is completed, and the load is fed back in real time through the force sensor 12.
Claims (8)
1. A loading method for a fatigue test is characterized by comprising the following steps: 1) the loading device comprises a loading device and a power device, wherein the loading device comprises a displacement limiting base, a loading platform and a loading mass block, the displacement limiting base comprises a plurality of parallel vertical slide rails, the loading platform is provided with a plurality of displacement pulleys, the displacement pulleys are matched with the vertical slide rails on the displacement limiting base, so that the loading platform can move up and down along the vertical slide rails, the bottom of the loading platform is provided with a transmission pulley, the upper end of the loading platform is provided with a traction point, the loading mass block can be placed on the loading platform, the power device comprises a motor and a cam, the cam is positioned on a transmission shaft of the motor, the cam is matched with the transmission pulley at the bottom of the loading platform, and the motor drives the loading platform to move up and down along the vertical slide rails through the cam; 2) the device comprises a traction rope for transmitting load, wherein a force sensor is arranged on the traction rope, one end of the traction rope is connected with a traction point of a loading platform, and the other end of the traction rope is connected with a fatigue test piece; 3) placing a loading mass block matched with the fatigue load on the loading platform; 4) the rotating speed of the transmission shaft of the motor is adjusted to adapt to the loading frequency of the fatigue load, the cam on the transmission shaft drives the loading platform to move up and down along the vertical sliding rail, and the loading platform transmits the fatigue load to the fatigue test piece through the traction rope.
2. A method of loading for fatigue testing according to claim 1, wherein said pull-cord connects the pull point of the loading platform to the fatigue testing member via a diverting pulley.
3. The utility model provides a loading equipment of fatigue test, its characterized in that, this loading equipment contains loading device and power device, loading device contain displacement restriction base, loading platform, loading mass piece, displacement restriction base contain the perpendicular slide rail of a plurality of parallels, loading platform is equipped with a plurality of displacement pulleys, this displacement pulley matches with the perpendicular slide rail on the displacement restriction base, makes loading platform can follow perpendicular slide rail up-and-down motion, is equipped with drive pulley in loading platform's bottom, is equipped with the traction point loading platform upper end, loading mass piece can place on loading platform, power device contain motor and cam, the cam is located the transmission shaft of motor, the cam matches with the drive pulley of loading platform bottom, the motor passes through the cam and drives loading platform along perpendicular slide rail up-and-down motion.
4. A loading apparatus for a fatigue test according to claim 3, wherein said displacement-limiting base is a square frame structure having a base and four vertical rails perpendicular to the base, the four vertical rails being respectively located at four corners of the base, each vertical rail having two rail surfaces perpendicular to each other.
5. A loading device for a fatigue test according to claim 3 or 4, wherein the loading platform is a square platform, and a set of displacement pulleys are respectively disposed at four corners of the square platform, each set of displacement pulleys comprises displacement pulleys located at two sides of the corner of the square platform and in different directions, and each set of displacement pulleys respectively corresponds to two slide rail surfaces of a vertical slide rail on the displacement limiting base.
6. The fatigue test loading device according to claim 5, wherein the loading platform has an attachment lug at each of the four corners of the loading platform, the attachment lugs having attachment holes, each attachment lug being gathered at a traction point of the loading platform by a rope.
7. A loading apparatus for a fatigue test according to claim 3, wherein two identical cams are provided on a drive shaft of a motor of said power unit.
8. A loading device for a fatigue test according to claim 3 or 7, wherein two groups of transmission pulleys are symmetrically distributed on the bottom center line of the loading platform, each group of transmission pulleys is provided with two pulleys which are axially parallel, and the distance between the two groups of transmission pulleys is equal to the distance between two cams on a motor transmission shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911289027.6A CN110907266A (en) | 2019-12-13 | 2019-12-13 | Loading method and loading equipment for fatigue test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911289027.6A CN110907266A (en) | 2019-12-13 | 2019-12-13 | Loading method and loading equipment for fatigue test |
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| Publication Number | Publication Date |
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| CN110907266A true CN110907266A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911289027.6A Pending CN110907266A (en) | 2019-12-13 | 2019-12-13 | Loading method and loading equipment for fatigue test |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204027809U (en) * | 2014-07-04 | 2014-12-17 | 中国电子科技集团公司第五十三研究所 | Reed torture test proving installation |
| CN107024400A (en) * | 2017-06-05 | 2017-08-08 | 安徽理工大学 | A kind of endurance experimental provision of engineering mechanics |
| CN107478424A (en) * | 2017-08-24 | 2017-12-15 | 柳州市颖航汽配有限公司 | The method of inspection of drag-line fatigue strength |
| CN107560953A (en) * | 2017-08-24 | 2018-01-09 | 柳州市颖航汽配有限公司 | For examining the device of drag-line fatigue strength |
| CN108088670A (en) * | 2017-11-29 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of low load fatigue test system of aircraft installation system |
| CN108732009A (en) * | 2018-08-03 | 2018-11-02 | 马鞍山齐力机电设备有限公司 | A kind of reciprocal endurance torsion test device and test method |
-
2019
- 2019-12-13 CN CN201911289027.6A patent/CN110907266A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204027809U (en) * | 2014-07-04 | 2014-12-17 | 中国电子科技集团公司第五十三研究所 | Reed torture test proving installation |
| CN107024400A (en) * | 2017-06-05 | 2017-08-08 | 安徽理工大学 | A kind of endurance experimental provision of engineering mechanics |
| CN107478424A (en) * | 2017-08-24 | 2017-12-15 | 柳州市颖航汽配有限公司 | The method of inspection of drag-line fatigue strength |
| CN107560953A (en) * | 2017-08-24 | 2018-01-09 | 柳州市颖航汽配有限公司 | For examining the device of drag-line fatigue strength |
| CN108088670A (en) * | 2017-11-29 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of low load fatigue test system of aircraft installation system |
| CN108732009A (en) * | 2018-08-03 | 2018-11-02 | 马鞍山齐力机电设备有限公司 | A kind of reciprocal endurance torsion test device and test method |
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Application publication date: 20200324 |