CN111982485A - Testing system for flexible connection joint - Google Patents
Testing system for flexible connection joint Download PDFInfo
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- CN111982485A CN111982485A CN202010842725.0A CN202010842725A CN111982485A CN 111982485 A CN111982485 A CN 111982485A CN 202010842725 A CN202010842725 A CN 202010842725A CN 111982485 A CN111982485 A CN 111982485A
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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
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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
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Abstract
The invention discloses a testing system of a flexible connection joint, which comprises a long-stroke assembly, a testing assembly and a sensor. Wherein the long-stroke assembly comprises a vertical column and a bracket moving along the vertical column in a vertical direction. The test assembly comprises a test table and a driving element, the test table is located below the support and used for bearing the flexible connecting joint, and the driving element is used for driving the flexible connecting joint to move in a specific direction. The sensor is used for sensing the fatigue characteristic value generated by the movement of the flexible connecting joint in the specific direction when the support moves to the test position. The invention can adopt one set of test system to complete the fatigue life test of different actions of various flexible connection joints.
Description
Technical Field
The invention relates to the technical field of mechanical engineering, in particular to a test system for a flexible connection joint.
Background
With the development of the aerospace technology, the passive thermal control mode of conduction and radiation such as a heat pipe and a coating which are used in the traditional spacecraft can not meet the heat dissipation requirements of high heat flow and large heat, and the active fluid loop thermal control technology gradually becomes one of indispensable measures for solving the heat dissipation of high heat flow density and the heat dissipation of the spacecraft with a complex orbit by virtue of the strong heat regulating capability and the flexible thermal management function of the active fluid loop thermal control technology, and is widely applied to the fields of manned spaceflight, space stations, deep space exploration, satellites and the like.
As a key moving part which is widely used in an active fluid loop thermal control system and has a flexible and bendable function, the flexible connecting joint is exposed to extreme environments for a long time, the mechanical properties of materials are changed due to the vacuum environment and medium conditions, and the flexible connecting joint is easily damaged, so that the active fluid loop thermal control module fails. Therefore, the fatigue life requirement of the flexible connection joint used by the spacecraft is extremely high, and the reliability of the flexible connection joint is not only related to the working performance of the active fluid thermal control system, but also has great influence on the effective operation of the spacecraft.
The fatigue life of the flexible connection joint used by the spacecraft in the vacuum service environment is verified by a test means, so that the method has important engineering practical significance. However, most of the existing test systems can only test the fatigue life of a single action for a certain type of flexible connection joints with similar structures.
Disclosure of Invention
The invention aims to overcome the defect that the single-action fatigue life test can be only carried out on a single type of flexible connection joint in the prior art, and provides a test system capable of completing different-action fatigue life tests on different types of flexible connection joints.
The invention solves the technical problems through the following technical scheme:
a system for testing a flexible joint, comprising:
the long-stroke assembly comprises an upright post and a bracket moving in the vertical direction along the upright post;
a test assembly comprising a test stand and a drive element; the test bench is positioned below the bracket and used for bearing the flexible connecting joint; the driving element is used for driving the flexible connecting joint to move in a specific direction;
a sensor for sensing a fatigue characteristic value of the flexible joint resulting from the movement in the particular direction when the bracket is moved to a test position.
Preferably, the flexible connection joint is a flexible corrugated hose horizontally arranged on the test bench, and the flexible corrugated hose comprises a first end statically arranged on the test bench and a second end rotating along with the test bench under the driving of the driving element; the sensor is a torque sensor and is detachably arranged on the lower surface of the support and used for testing the torque of the flexible corrugated hose in a bent state.
Preferably, the flexible connecting joint is a flexible coil spring pipe which is vertically arranged on the test bench, and the flexible coil spring pipe comprises a first end which is statically arranged on the test bench and a second end which rotates along with the test bench under the driving of the driving element; the sensor is a torque sensor and is detachably arranged on the lower surface of the support and used for testing the torque of the flexible coil spring pipe.
Preferably, the driving element is a servo motor disposed in the test table.
Preferably, the test system further comprises a tooling fixture and a first connecting platform, the tooling fixture comprises an upper tooling and a lower tooling for clamping the flexible connecting joint, wherein the upper tooling is fixedly connected with the first end of the flexible connecting joint and the first connecting platform; the lower tool is fixedly connected with the second end of the flexible connecting joint and the test bench; the first connecting platform is fixedly connected with the support.
Preferably, the flexible connecting joint is a flexible corrugated pipe which is vertically arranged on the test board; the driving element is a micro-motion loading assembly arranged on the bracket, and the micro-motion loading assembly comprises a micro-motion loading upright post which performs reciprocating motion in the vertical direction; the flexible corrugated pipe comprises a first end which is statically arranged on the test board and a second end which is connected with the lower end of the micro-motion loading upright post and reciprocates along with the micro-motion loading upright post in the vertical direction; the sensor is a force sensor, is detachably connected with the lower end of the micro-motion loading upright post and is used for testing the pressure of the flexible corrugated pipe.
Preferably, the test system further comprises a spherical tool, the lower end of the spherical tool is in contact with the second end of the flexible corrugated pipe, the upper end of the spherical tool is in contact with the force sensor, and the sensor collects pressure applied by the spherical tool to the flexible corrugated pipe.
Preferably, the micro-motion loading assembly further comprises a third servo motor, an eccentric assembly and a micro-motion loading bracket, the servo motor and the eccentric assembly are mounted on the micro-motion loading bracket, the micro-motion loading upright post is connected with the eccentric assembly, and the servo motor drives the eccentric assembly to drive the micro-motion loading upright post to reciprocate in the vertical direction.
Preferably, the micro-motion loading support comprises a first horizontal part and a first vertical part, and the first vertical part comprises a limiting component which limits the motion of the micro-motion loading stand column along the vertical direction.
Preferably, the eccentric assembly includes an eccentric wobble plate and a transmission link, and the limiting assembly includes a vertical guide rail disposed at the first vertical portion and a reciprocating plate connected to the transmission link and moving along the vertical guide rail.
Preferably, long stroke subassembly include servo drive unit and with the unipolar module that servo drive unit connects, unipolar module still with the leg joint, servo drive unit drive unipolar module drives the support is followed stand vertical movement.
Preferably, the long stroke assembly further comprises a locking unit for locking the cradle when the cradle is moved to the testing position.
Preferably, the long-stroke assembly further comprises a horizontally arranged mounting base plate, and the test bench is detachably arranged on the mounting base plate.
Preferably, the test system further comprises a vacuum cavity for providing a vacuum environment for the test of the flexible connection joint.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: by adopting the structure, the testing system for the flexible connecting joint can be suitable for flexible connecting pipes of different types, can test the fatigue life of various actions, and has good universality.
Drawings
FIG. 1 is a schematic structural diagram of a testing system for a flexible joint according to a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of a long stroke assembly according to a preferred embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a testing system for flexible corrugated hose according to another preferred embodiment of the present invention.
FIG. 4 is a schematic diagram of the flexible corrugated hose installed in the test station according to the preferred embodiment of the present invention.
FIG. 5 is a schematic structural view of a tooling fixture for flexible corrugated tubing according to a preferred embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a testing system for a flexible coil spring according to another preferred embodiment of the present invention.
FIG. 7 is a schematic structural diagram of the installation of the flexible wave coil spring tube in the test station according to the preferred embodiment of the present invention.
FIG. 8 is a structural schematic diagram of a work fixture for a flexible coil spring tube according to a preferred embodiment of the invention
FIG. 9 is a schematic structural diagram of a testing system for flexible bellows according to another preferred embodiment of the present invention.
FIG. 10 is a schematic view of the micro loading assembly according to the preferred embodiment of the present invention.
FIG. 11 is a schematic structural view of a flexible bellows installed in a test station according to a preferred embodiment of the present invention.
FIG. 12 is a schematic view of a vacuum chamber according to a preferred embodiment of the present invention
Description of reference numerals:
long stroke assembly 1
Single-axis module 13
First servo reducer 15
Auxiliary upright column 16
Linear bearing 17 with lock
Second servo reducer 22
Rotating table 23
Rotating shaft support 24
Chuck 25
Tool support 26
Third servo reducer 42
Reciprocating plate 48
Flexible corrugated hose 51
Flexible coil spring tube 52
Flexible bellows 53
Detailed Description
The present invention is further illustrated by the following specific examples, but is not limited thereby in the scope of the following examples.
Fig. 1 shows a test system of a flexible joint according to the present embodiment. The testing system of the flexible connecting joint is used for testing the fatigue characteristic value of the flexible connecting joint 5 and comprises a long-stroke assembly 1, a testing assembly and a sensor 3. As shown in fig. 2, the long stroke assembly 1 includes a column 11 and a carriage 12 that moves in a vertical direction along the column 11. The test assembly comprises a test bench 2 and a driving element, wherein the test bench 2 is positioned below the bracket 11 and is used for bearing the flexible connecting joint 5, and the driving element is used for driving the flexible connecting joint 5 to move in a specific direction. The sensor 3 is used for sensing the fatigue characteristic value of the flexible connecting joint 5 generated by the movement in the specific direction when the bracket 11 is moved to the test position.
In the invention, the tested flexible connection joint can be a flexible corrugated hose, a flexible coil spring pipe or a flexible corrugated pipe, and the test system can be used for bending test of the flexible corrugated hose, torsion test of the flexible coil spring pipe and tension and compression test of the flexible corrugated pipe. These three tests will be described in detail below.
Example one
In this embodiment, the flexible connection joint is a flexible corrugated hose, and the test system can perform bending test of the flexible corrugated hose and can determine fatigue characteristics and fatigue life of the flexible corrugated hose under bending alternating load at room temperature.
Referring to fig. 2 to 5, the test system includes a long stroke assembly 1, a test assembly and a sensor 3. The long-stroke assembly 1 comprises a vertically arranged upright 11 and a carriage 12, the carriage 12 being movable in a vertical direction along the upright. The test assembly comprises a test bench 2 and a drive element. The test bench 2 is located below the support 12, the flexible corrugated hose 51 is carried on the test bench 2, and the driving element drives the test bench 2 to rotate and drives one end of the flexible corrugated hose 51 to rotate together with the test bench. The sensor 3 is a torque sensor detachably provided on the lower surface of the bracket 12 for sensing the torque of the flexible bellows 51 in a bent state. Referring to fig. 12, preferably, the testing system further includes a bell-type vacuum chamber 8 for accommodating the long-stroke assembly 1, the testing assembly, the sensor 3, and the like, and providing a vacuum environment, so as to simulate the real working conditions of the flexible corrugated hose. And the vacuum cavity adopts an oversized operation door 82, so that the test assembly and the test workpiece (namely the flexible corrugated hose) can be conveniently replaced. An observation window 81 is provided on the operation door 82 to facilitate observation of the test condition. The vacuum chamber 8 may be provided on a movable base frame.
Referring to fig. 2, the long-stroke assembly 1 further includes a servo driving unit and a single-axis module 13 connected to the servo driving unit. The bracket 12 is an L-shaped bracket having a horizontal portion and a vertical portion. The sensor 3 is detachably mounted on the lower surface of the horizontal portion. The single-axis module 13 is connected to the support 12. The servo driving unit in this embodiment includes a first servo motor 14 and a first servo reducer 15, and the first servo motor 14 and the first servo reducer 15 drive the single-axis module 13 to move up and down along the column 11, and at the same time drive the bracket 12 to move up and down along the column 11. Further, the long stroke assembly 1 further comprises a locking unit for locking the holder 12 to be fixed when the holder 12 is moved to the test position. In this embodiment, the locking unit includes auxiliary column 16 and belt locking linear bearing 17, and belt locking linear bearing 17 sets up and realizes the locking function on auxiliary column. The long-stroke assembly of the embodiment has the advantages of low complete machine power and low assembly difficulty. Preferably, the long-stroke assembly 1 further comprises a horizontally arranged mounting base plate 18, and the test platform 2 is detachably arranged on the mounting base plate 18, for example, at a first position of the mounting base plate 18, which corresponds to the position of the torque sensor.
Referring to fig. 4, the driving element includes a second servo motor 21 and a second servo reducer 22. A second servo motor 21 and a second servo reducer 22 are provided in the test stand. The test bench 2 further comprises a rotary table 23 and a rotary shaft support 24. The flexible corrugated hose 51 is horizontally disposed on the rotary table 23, one end of the flexible corrugated hose is stationary, and the other end of the flexible corrugated hose rotates along with the test table 2 driven by the second servo motor 21. Thereby, the straight tube section of the flexible corrugated hose 51 can be bent. Referring to fig. 5, the test system further comprises a tooling fixture for fixing the flexible corrugated hose 51 and the first connection platform 7. The tooling fixture comprises an upper tooling 61 and a lower tooling 62 for clamping the flexible corrugated hose 51, wherein the upper tooling 61 is connected with the static end of the flexible corrugated hose, in particular the static end of the flexible corrugated hose is fixedly connected to the first connecting platform 7. And the first connecting platform 7 is fixedly connected with the bracket 12. Since the holder 12 is locked in the test position, the stationary end of the flexible bellows 51 can be kept in a fixed stationary state. The lower fixture 62 is connected to a rotating end of the flexible corrugated hose 51, and specifically, the rotating end is fixedly connected to the rotating table 23. The control system sets parameters of relevant motion parameters (frequency, cycle times and the like), the second servo motor 21 drives the rotating platform 23 to drive the lower tool 62 to rotate so as to realize the rotating motion of the rotating end of the flexible corrugated hose 51, and the torque sensor tests the torque of the flexible corrugated hose 51 in a bending state.
In this embodiment, the upper tool 61 and the lower tool 62 are both L-shaped, the short side of the L-shaped tool is connected to the end of the flexible corrugated hose, and the long side is connected to the rotary table 23 or the first connecting platform 7. The universal tool clamp can be used for conveniently and fixedly mounting flexible corrugated hoses with different diameters, and when the flexible corrugated hose is bent to the maximum, the straight pipe section of the corrugated hose can be bent to be in a parallel state by the tool clamp without interference.
Next, the operation principle and the operation flow of the test system of the present embodiment will be explained.
First, a test assembly is installed. A test assembly (including a test station and a second servo motor and a second servo reducer in the test station) is mounted at a first location on the mounting baseplate 18.
Then, aiming at the flexible corrugated hoses with different sizes, diameters and lengths, the flexible corrugated hoses are sequentially installed on the upper tool 61 and the lower tool 62 through the adapters with corresponding sizes and locked, and the distance between the left end and the right end of the upper tool 61 and the distance between the right end and the left end of the lower tool 62 are adjusted to adapt to the length of the flexible corrugated bent pipe.
Next, the torque sensor and the first connection platform 7 are mounted on the lower surface of the bracket 12.
The first servo motor 14 of the long-stroke assembly 1 drives the support 12 to descend to the testing position, the upper tool 61 and the lower tool 62 are respectively fixed to the first connecting platform 7 and the rotating platform 23, and the upper tool 61 and the lower tool 62 are adjusted to be on a horizontal line.
And closing an operation door of the vacuum cavity and establishing a vacuum test environment.
Then, the control system sets parameters of relevant motion parameters (frequency, cycle number and the like), the second servo motor 21 drives the rotating platform to drive the tool to rotate, and the test system starts to perform a test. The torque sensor collects the change condition of the torque in the testing process of the flexible corrugated hose 51, the set cycle number is reached, the testing is stopped, whether the tested flexible corrugated hose reaches the required service life (100 ten thousand times) is verified, and data support is provided for researching the fatigue behavior of the spacecraft flexible corrugated hose in the vacuum environment.
Example two
In this embodiment, the flexible connection joint is a flexible coil spring tube, and the test system can perform a torsion test of the flexible coil spring tube and can measure the fatigue characteristics and the fatigue life of the flexible coil spring tube under a torsion alternating load at room temperature.
Referring to fig. 6 to 8, the test system includes a long stroke assembly 1, a test assembly and a sensor 3. The long-stroke assembly 1 comprises a vertically arranged upright 11 and a carriage 12, the carriage 12 being movable in a vertical direction along the upright. The test assembly comprises a test bench 2 and a drive element. The test bench 2 is positioned below the bracket 12, the flexible coil spring tube 52 is arranged on the test bench 2, and the driving element drives the test bench 2 to rotate and drives one end of the flexible coil spring tube 52 to rotate along with the test bench. The sensor 3 is a torque sensor detachably provided on the lower surface of the bracket 12 for sensing the torque of the flexible coil spring 52. Preferably, the test system further comprises a bell-type vacuum cavity 8 which accommodates the long-stroke assembly 1, the test assembly, the sensor 3 and the like, and provides a vacuum environment, so that the real working condition of the flexible coil spring can be simulated. And the vacuum cavity adopts an oversized operation door 82, so that the test assembly and the test workpiece (namely the flexible coil spring tube) can be conveniently replaced. An observation window 81 is provided on the operation door 82 to facilitate easy observation of the test condition. The vacuum chamber 8 may be provided on a movable base frame.
Referring to fig. 2, the long-stroke assembly 1 further includes a servo driving unit and a single-axis module 13 connected to the servo driving unit. The bracket 12 is an L-shaped bracket having a horizontal portion and a vertical portion. The sensor 3 is detachably mounted on the lower surface of the horizontal portion. The single-axis module 13 is connected to the support 12. The servo driving unit in this embodiment includes a first servo motor 14 and a first servo reducer 15, and the first servo motor 14 and the first servo reducer 15 drive the single-axis module 13 to move up and down along the column 11, and at the same time drive the bracket 12 to move up and down along the column 11. Further, the long stroke assembly 1 further comprises a locking unit for locking the holder 12 to be fixed when the holder 12 is moved to the test position. In this embodiment, the locking unit includes auxiliary column 16 and belt locking linear bearing 17, and belt locking linear bearing 17 sets up and realizes the locking function on auxiliary column. The long-stroke assembly of the embodiment has the advantages of low complete machine power and low assembly difficulty. Preferably, the long-stroke assembly 1 further comprises a horizontally arranged mounting base plate 18, and the test platform 2 is detachably arranged on the mounting base plate 18, for example, at a first position of the mounting base plate 18, which corresponds to the position of the torque sensor.
Referring to fig. 7, the driving element includes a second servo motor 21 and a second servo reducer 22. A second servo motor 21 and a second servo reducer 22 are provided in the test stand. The test bench 2 further comprises a rotary table 23 and a rotary shaft support 24. The flexible coil spring tube 52 is vertically arranged on the rotary table 23, the upper end of the flexible coil spring tube is in a stationary arrangement, and the lower end of the flexible coil spring tube rotates along with the test table 2 driven by the second servo motor 21. Referring to fig. 7, the testing system further includes a fixture for fixing the flexible coil spring 52 and the first connecting platform 7. The tooling clamp comprises an upper tooling 61 and a lower tooling 62 which are used for clamping the flexible coil spring tube 52, wherein the upper tooling 61 is connected with the upper end of the flexible wave coil spring tube 52, and particularly, the upper end of the flexible coil spring tube 52 is fixedly connected to the first connecting platform 7. And the first connecting platform 7 is fixedly connected with the bracket 12. Since the carriage 12 is locked in the testing position, the upper end of the flexible coil spring tube 52 can remain in a fixed stationary condition. The lower fixture 62 is connected to the lower end of the flexible coil spring tube 52, specifically, the lower end is fixedly connected to the rotary table 23. The control system sets parameters of relevant motion parameters (frequency, cycle times and the like), the second servo motor 21 drives the rotating platform 23 to drive the lower tool 62 to rotate so as to realize the lower end rotation motion of the flexible coil spring tube 52, and the torque sensor tests the torque of the flexible coil spring tube 52.
In this embodiment, the upper tool 61 and the lower tool 62 are both L-shaped, the short side of the L-shaped tool is connected to the side wall of the flexible coil spring tube 52, and the long side is connected to the rotary table 23 or the first connecting platform 7. The universal tool clamp can be used for conveniently and fixedly mounting the flexible coil spring pipes with different size parameters such as diameter, height and the like.
Next, the operation principle and the operation flow of the test system of the present embodiment will be explained.
First, a test assembly is installed. A test assembly (including a test station and a second servo motor and a second servo reducer in the test station) is mounted at a first location on the mounting baseplate 18.
Then, aiming at the flexible coil springs 52 with different diameters and heights, the flexible coil springs are sequentially mounted on the upper tool 61 and the lower tool 62 through corresponding size adapters and locked, and the distance between the left end and the right end of the upper tool 61 and the distance between the left end and the right end of the lower tool 62 are adjusted to adapt to the diameter distance of the flexible coil springs 52.
Next, the torque sensor and the first connection platform 7 are mounted on the lower surface of the bracket 12.
Then, the first servo motor 14 of the long-stroke assembly drives the support 12 to descend to the testing position, the upper tool 61 and the lower tool 62 are respectively fixed to the first connecting platform 7 and the rotating platform 23, and the upper tool 61 and the lower tool 62 are adjusted to be suitable for the height of the flexible coil spring.
And closing an operation door of the vacuum cavity and establishing a vacuum test environment.
Then, the control system sets parameters of relevant motion parameters (frequency, cycle frequency, rotation angle and the like), the second servo motor 21 drives the rotating platform 23 to drive the lower tool 62 to rotate, the lower end of the flexible coil spring tube 52 rotates, and the test system starts to perform testing.
The torque sensor collects the change condition of the torque in the testing process of the flexible coil spring 52, the set cycle number is reached, the testing is stopped, whether the tested flexible coil spring reaches the required service life (100 ten thousand times) or not is verified, and data support is provided for researching the fatigue behavior of the flexible coil spring of the spacecraft in the vacuum environment.
EXAMPLE III
In this embodiment, the flexible connection joint is a flexible corrugated pipe, and the test system can perform a tension-compression test on the flexible corrugated pipe, and can measure fatigue characteristics and fatigue life of the flexible corrugated pipe under tensile and compression alternating loads at room temperature.
Referring to fig. 9 to 11, the test system includes a long stroke assembly 1, a test assembly and a sensor 3. The long-stroke assembly 1 comprises a vertically arranged upright 11 and a carriage 12, the carriage 12 being movable in a vertical direction along the upright. The test assembly comprises a test bench 2 and a drive element. The test bench 2 is positioned below the support 12, the flexible bellows 53 is provided on the test bench 2, and the driving member drives one end of the flexible bellows 53 to reciprocate in the vertical direction. The sensor 3 is a force sensor for sensing the pressure of the flexible bellows 53. Preferably, the test system further comprises a bell-type vacuum cavity 8 for accommodating the long-stroke assembly 1, the test assembly, the sensor 3 and the like, and providing a vacuum environment, so that the real working condition of the flexible corrugated pipe can be simulated. And the vacuum cavity adopts an oversized operation door 82, so that the test assembly and the test workpiece (namely the flexible corrugated pipe) can be conveniently replaced. An observation window 81 is provided on the operation door 82 to facilitate easy observation of the test condition. The vacuum chamber 8 may be provided on a movable base frame.
Referring to fig. 2, the long-stroke assembly 1 further includes a servo driving unit and a single-axis module 13 connected to the servo driving unit. The bracket 12 is an L-shaped bracket having a horizontal portion and a vertical portion. The sensor 3 is detachably mounted on the lower surface of the horizontal portion. The single-axis module 13 is connected to the support 12. The servo driving unit in this embodiment includes a first servo motor 14 and a first servo reducer 15, and the first servo motor 14 and the first servo reducer 15 drive the single-axis module 13 to move up and down along the column 11, and at the same time drive the bracket 12 to move up and down along the column 11. Further, the long stroke assembly 1 further comprises a locking unit for locking the holder 12 to be fixed when the holder 12 is moved to the test position. In this embodiment, the locking unit includes auxiliary column 16 and belt locking linear bearing 17, and belt locking linear bearing 17 sets up and realizes the locking function on auxiliary column. The long-stroke assembly of the embodiment has the advantages of low complete machine power and low assembly difficulty. Preferably, the long-stroke assembly 1 further comprises a horizontally arranged mounting base plate 18, and the test platform 2 is detachably arranged on the mounting base plate 18, for example, at a second position of the mounting base plate 18, which corresponds to the position of the force sensor.
Referring to fig. 10, the driving element is a micro-motion loading assembly 4 disposed on the horizontal portion of the frame 12, and the micro-motion loading assembly 4 includes a micro-motion loading column 46 performing a vertical high-frequency reciprocating motion. The flexible bellows 53 is vertically disposed on the test stand 2, and includes a lower end statically disposed on the test stand 2, and an upper end connected to the lower end of the inching loading column 46 and performing a high-frequency reciprocating motion in a vertical direction along with the inching loading column 46. The sensor 3 is a force sensor and is detachably connected with the lower end of the micro-motion loading upright post 6. The force sensor is used to test the pressure of the flexible bellows 53 during the high frequency vertical reciprocating motion of the micro-motion loading column 46.
The micro-motion loading assembly 4 further comprises a drive unit, an eccentric assembly connected to the drive unit and a micro-motion loading bracket 43. The micro-motion loading bracket 43 is L-shaped and includes a first horizontal portion and a first vertical portion, and the driving unit is installed at one side of the first vertical portion of the micro-motion loading bracket 43 and above the first horizontal portion. The inching loading column 46 is located on the other side of the first vertical portion and is connected to the eccentric assembly, and the driving unit drives the eccentric assembly to drive the inching loading column to reciprocate in the vertical direction. In this embodiment, the driving unit includes a third servo motor 41 and a third servo reducer 42. The eccentric assembly includes an eccentric wobble plate 44 and a drive link 45. The third servo motor drives the eccentric wobble plate 44 to rotate, and drives the micro-motion loading upright column 46 to do high-frequency reciprocating motion in the vertical direction through the transmission connecting rod 45. Since the micro-motion loading assembly 4 is mounted on the L-shaped bracket of the long stroke assembly 11, the horizontal portion of the L-shaped bracket has a through hole for the lower end of the micro-motion loading column 46 to pass through when reciprocating up and down at high frequency. Further, the first vertical portion of the micro-motion loading bracket 43 includes a limiting assembly for constraining the micro-motion loading column 46 from moving in a vertical direction. Specifically, the limiting assembly may include a vertical guide 47 provided at the first vertical portion and a reciprocating plate 48 connected with the transmission link 45 and moving along the vertical guide 47. In the embodiment, the long stroke assembly is combined with the micro-motion loading assembly, the long stroke assembly is adjusted to a test position from top to bottom, and the micro-motion loading assembly realizes high-frequency reciprocating motion.
Referring to fig. 11, the test stand includes a chuck 25 and a tool support 26. The tool support 26 is detachably mounted on the mounting base plate 18 of the long stroke assembly 11, and the chuck 25 is located on the tool support 26 and used for clamping the flexible corrugated pipe 53. In the present embodiment, the chuck 25 is a three-jaw chuck. The test system further comprises a spherical tool 63, the lower end of the spherical tool 63 is in contact with the upper end of the flexible corrugated pipe 53, and the upper end of the spherical tool 63 is in contact with the force sensor. The force sensor is arranged between the lower end of the micro-motion loading upright column 46 and the upper end of the spherical tool 63, and the force sensor collects pressure applied by the spherical tool 63 to the flexible corrugated pipe 53. The spherical tool can be suitable for flexible corrugated pipes with different diameters, and the spherical tool can press the flexible corrugated pipes as long as the aperture of the flexible corrugated pipes is smaller than the diameter of the spherical tool.
Next, the operation principle and the operation flow of the test system of the present embodiment will be explained.
First, a test stand is installed. A test station comprising a tooling support 26 and a chuck 25 is mounted at a second location on the mounting base plate 18, with the chuck 25 located directly below the micro-motion loading column.
Next, for flexible corrugated pipes having different diameters and heights, the lower end of the flexible corrugated pipe is fixed by a chuck 25, and the upper end is pressed by a spherical tool 63. The force sensor can be connected with the lower end of the micro-motion loading upright post in advance.
The servo motor 14 of the long-stroke assembly 11 drives the support 12 to vertically move to a testing position, so that the micro-motion loading assembly 4 is driven to descend to a height suitable for the flexible corrugated pipe 53, and at the moment, the force sensor is in contact with the spherical tool 63.
And closing an operation door of the vacuum cavity and establishing a vacuum test environment.
The control system sets parameters of relevant motion parameters (frequency, cycle times and the like), the third servo motor 41 of the micro-motion loading assembly drives the eccentric swinging disk 44 to reciprocate, meanwhile, the transmission connecting rod 45 is connected with the reciprocating plate 48 to move along the vertical guide rail 47 to realize the up-and-down high-frequency reciprocating motion of the micro-motion loading upright column 46, and the test system starts to test.
The force sensor collects the pressure change condition in the testing process of the flexible corrugated pipe, the set cycle number is reached, the testing is stopped, whether the tested flexible corrugated pipe reaches the required service life (100 ten thousand times) is verified, and data support is provided for researching the fatigue behavior of the flexible corrugated pipe of the spacecraft in the vacuum environment.
To sum up, the articulated test system of flexonics of this application adopts the integral type design to one set of hardware test system, only needs to change test assembly, different test workpiece and the sensor of collocation, just can accomplish three test to different flexonics joints, satisfy different test demands.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (14)
1. A system for testing a flexible joint, comprising:
the long-stroke assembly comprises an upright post and a bracket moving in the vertical direction along the upright post;
a test assembly comprising a test stand and a drive element; the test bench is positioned below the bracket and used for bearing the flexible connecting joint; the driving element is used for driving the flexible connecting joint to move in a specific direction;
a sensor for sensing a fatigue characteristic value of the flexible joint resulting from the movement in the particular direction when the bracket is moved to a test position.
2. The system for testing a flexible joint according to claim 1, wherein said flexible joint is a flexible bellows horizontally disposed on said test station, said flexible bellows comprising a first end stationarily disposed on said test station and a second end rotatable with said test station driven by said drive element; the sensor is a torque sensor, is detachably mounted on the lower surface of the support and is used for testing the torque of the flexible corrugated hose in a bent state.
3. The system for testing a flexible joint according to claim 1, wherein the flexible joint is a flexible coil spring tube vertically disposed on the test table, the flexible coil spring tube comprising a first end statically disposed on the test table and a second end rotating with the test table driven by the driving element; the sensor is a torque sensor, is detachably mounted on the lower surface of the support and is used for testing the torque of the flexible coil spring pipe.
4. The system for testing a flexible joint according to claim 2 or 3, wherein the driving element is a second servo motor and a second servo reducer provided in the testing table.
5. The system for testing the flexible connection joint according to claim 2, further comprising a tooling fixture and a first connection platform, wherein the tooling fixture comprises an upper tooling and a lower tooling for clamping the flexible connection joint, wherein the upper tooling is fixedly connected with the first end of the flexible connection joint and the first connection platform; the lower tool is fixedly connected with the second end of the flexible connecting joint and the test bench; the first connecting platform is fixedly connected with the support.
6. The system for testing a flexible joint according to claim 1, wherein said flexible joint is a flexible bellows vertically disposed on said test bed; the driving element is a micro-motion loading assembly arranged on the bracket, and the micro-motion loading assembly comprises a micro-motion loading upright post which performs reciprocating motion in the vertical direction; the flexible corrugated pipe comprises a first end which is statically arranged on the test board and a second end which is connected with the lower end of the micro-motion loading upright post and reciprocates along with the micro-motion loading upright post in the vertical direction; the sensor is a force sensor, is detachably connected with the lower end of the micro-motion loading upright post and is used for testing the pressure of the flexible corrugated pipe.
7. The system for testing a flexible joint of claim 6, further comprising a spherical tooling, wherein a lower end of the spherical tooling contacts the second end of the flexible bellows, an upper end of the spherical tooling contacts the force sensor, and the force sensor collects pressure applied by the spherical tooling to the flexible bellows.
8. The system for testing the flexible joint according to claim 6, wherein the micro-motion loading assembly further comprises a third servo motor, an eccentric assembly and a micro-motion loading bracket, the servo motor and the eccentric assembly are mounted on the micro-motion loading bracket, the micro-motion loading column is connected with the eccentric assembly, and the servo motor drives the eccentric assembly to drive the micro-motion loading column to reciprocate in the vertical direction.
9. The system for testing a flexible joint of claim 6, wherein said micro-motion loading mount comprises a first horizontal portion and a first vertical portion, said first vertical portion comprising a stop assembly, said stop assembly restraining said micro-motion loading post from moving in said vertical direction.
10. The system for testing a flexible joint of claim 9, wherein the eccentric assembly comprises an eccentric wobble plate and a drive link, and the limit assembly comprises a vertical guide disposed at the first vertical portion and a reciprocating plate coupled to the drive link and moving along the vertical guide.
11. The system for testing a flexible joint of claim 1, wherein the long-stroke assembly comprises a servo driving unit and a single-shaft module connected to the servo driving unit, the single-shaft module is further connected to the support, and the servo driving unit drives the single-shaft module to drive the support to move vertically along the column.
12. The system for testing a flexible joint of claim 1 wherein said long travel assembly further comprises a locking unit for locking said cradle when said cradle is moved to said testing position.
13. The system for testing a flexible joint of claim 12 wherein said long travel assembly further comprises a horizontally disposed mounting base plate, said test station being removably disposed on said mounting base plate.
14. The system for testing a flexible joint of claim 1, further comprising a vacuum chamber for providing a vacuum environment for testing of the flexible joint.
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