Test piece acceleration real-time monitoring device and method in centrifugal acceleration test

Abstract

The invention relates to a test piece acceleration real-time monitoring device and method in a centrifugal acceleration test, and belongs to the technical field of centrifugal tests.The test piece acceleration real-time monitoring device comprises an annular frame body, a first laser range finder, a second laser range finder and a rotating speed measuring instrument; an electromagnetic clutch is arranged at the end of the centrifugal machine rotating shaft and connected with a rotating column, the first laser range finder is arranged on the rotating column, and a first adjusting piece is arranged on the rotating column. The end, away from the center shaft, of a rotating arm of the centrifugal machine is connected with a sliding seat, the sliding seat is slidably connected with the annular frame body, the sliding seat is slidably connected with a sliding block, the sliding block slides around a rotating shaft of the centrifugal machine, the second laser range finder is arranged on the sliding block, and a second adjusting piece is arranged on the sliding block; the rotating speed measuring instrument is used for measuring centrifuge rotating speed in real time. The device and the method have the effects of realizing real-time monitoring of the acceleration magnitude of the detection test piece and improving the test accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal testing, and in particular to a device and method for real-time monitoring of acceleration of a specimen in a centrifugal acceleration test. Background Art

[0002] At present, when doing acceleration test on centrifuge, the acceleration value is set according to the regulations, the distance from the center point of the test piece to the center of the rotating axis is measured and set, and then the centrifugal constant acceleration tester is started to start the test. The speed of the centrifuge and the distance from the test center to the center of the rotating axis are constant by default. There are two shortcomings: 1. In the above method, the acceleration is set only as the value of the centroid, geometric center, or a key point of the specimen, and the values ​​of all points on the surface of the specimen are not taken into account.

[0003] 2. According to engineering experience, the speed of the centrifuge changes dynamically with time during the test, causing the cantilever speed of the centrifuge to change dynamically. Since the specimen is installed on the centrifuge arm platform, it is affected by the looseness of the fixture or the sudden change of the centrifuge speed, and the distance from the measuring point of the specimen to the center of the rotating axis also changes dynamically.

[0004] This will result in the current acceleration test not monitoring whether the acceleration values ​​of all points of the test piece are within the tolerance specified by the standard, thus affecting the accuracy of the test. Summary of the invention

[0005] In order to achieve real-time monitoring of the acceleration value of a test piece and improve the test accuracy, the present application provides a device and method for real-time monitoring of the acceleration of a test piece in a centrifugal acceleration test.

[0006] The present application provides a device for real-time monitoring of specimen acceleration in a centrifugal acceleration test using the following technical solution: A device for real-time monitoring of acceleration of a specimen in a centrifugal acceleration test, comprising an annular frame, a first laser rangefinder, a second laser rangefinder and a rotation speed measuring instrument; An electromagnetic clutch is provided at the end of the centrifuge shaft, the electromagnetic clutch is connected to a rotating column, the first laser rangefinder is provided on the rotating column, a first adjusting member for adjusting the height of the first laser rangefinder is provided on the rotating column, and an extension line of the measuring direction of the first laser rangefinder passes through the central axis of the centrifuge; The annular frame is coaxially arranged around the centrifuge, and a sliding seat is connected to one end of the rotating arm of the centrifuge away from the central axis, and the sliding seat is slidably connected to the annular frame, and a sliding block is slidably connected to the sliding seat, and the sliding block slides around the rotating shaft of the centrifuge, and the second laser rangefinder is arranged on the sliding block, and a second adjusting member for adjusting the height of the second laser rangefinder is arranged on the sliding block, and the measuring direction of the second laser rangefinder is horizontally pointed to the rotating shaft of the centrifuge; The rotation speed measuring instrument is used to measure the rotation speed of the centrifuge in real time.

[0007] By adopting the above technical solution, the load caused by acceleration is proportional to the distance of the specimen from the rotating axis. Therefore, it is only necessary to measure the distances L1 and L2 of the specimen closest to and farthest from the central axis of the centrifuge shaft in real time, and combine the speed value measured in real time to ensure that the acceleration values ​​of these two points do not exceed the tolerance, so as to achieve real-time monitoring of the acceleration values ​​of the test specimen, ensure that the acceleration changes of each point during the experiment will not exceed the specified range, improve the test accuracy, and do not need to fully monitor the entire specimen surface, thereby reducing the measurement difficulty.

[0008] Moreover, the first laser rangefinder can be rotated and moved up and down through the rotating column and the first adjusting member. The second laser rangefinder can be moved around the centrifuge shaft and moved up and down through the sliding block and the second adjusting member. Such a design can meet the needs of specimens of different sizes and shapes, improve the adaptability of the device, and can meet the needs of specimens of different sizes and shapes.

[0009] Moreover, the first laser rangefinder is installed on the rotating column and is fixed in position by the first adjusting member. The first laser rangefinder is short from the central axis of the rotating shaft, and the centrifugal force applied to the first laser rangefinder is almost negligible. Therefore, the first laser rangefinder will not deviate during the test, thereby ensuring the accuracy of the test data at the nearest point of the test piece.

[0010] The same is true for the second laser rangefinder. The second laser rangefinder is installed on the sliding block, and the second adjusting member cooperates to fix the position. During the test, even if the second laser rangefinder is subjected to a large centrifugal force, the second laser rangefinder is supported by the sliding block, and the sliding block is supported by the sliding seat. Therefore, the second laser rangefinder will not deviate during the test, ensuring the accuracy of the test data at the farthest point of the specimen.

[0011] The design of the support frame and the sliding seat disperses the force on the end of the rotating arm, reduces the bending of the rotating arm due to the weight of the specimen, and thus reduces the position deviation in the measurement of the nearest and farthest points of the specimen. Even in the case of high speed and large specimen weight tests, the stability and reliability of the test results can be guaranteed.

[0012] Optionally, a first sliding groove is provided on the rotating column, the first adjusting member includes a first mounting block, the first mounting block is slidably set in the first sliding groove, the first laser rangefinder is installed on the first mounting block, the rotating column is rotatably connected to a first screw, and the first mounting block is threadedly connected to the first screw.

[0013] By adopting the above technical solution, the first mounting block can be moved by rotating the first lead screw, thereby achieving height adjustment of the first laser rangefinder.

[0014] Optionally, the sliding block is fixed to the sliding seat by a tightening bolt, the sliding block is provided with a second sliding groove, the second adjusting member includes a second mounting block, the second mounting block is slidably set in the second sliding groove, the second laser rangefinder is installed on the second mounting block, the sliding block is rotatably connected to a second lead screw, and the second mounting block is threadedly connected to the second lead screw.

[0015] By adopting the above technical solution, the second mounting block can be moved by rotating the second lead screw, thereby achieving height adjustment of the second laser rangefinder.

[0016] Optionally, two first laser rangefinders are provided, and the two first laser rangefinders are symmetrically arranged about the central axis of the centrifuge shaft.

[0017] The present application provides a method for real-time monitoring of specimen acceleration in a centrifugal acceleration test using the following technical solution: A method for real-time monitoring of acceleration of a specimen in a centrifugal acceleration test, applied to the above-mentioned device for real-time monitoring of acceleration of a specimen in a centrifugal acceleration test, comprises the following steps: Real-time measurement of the distance L1 between the point of the specimen closest to the central axis of the centrifuge shaft and the central axis of the centrifuge shaft; Real-time measurement of the distance L2 between the point of the specimen farthest from the central axis of the centrifuge shaft and the central axis of the centrifuge shaft; Real-time measurement of the centrifuge speed n, the system presets the acceleration value N, and calculates N based on the values ​​of L1, L2 and n a and N b ; N a is the acceleration value of the point of the specimen closest to the center axis of the centrifuge shaft, N b It is the acceleration value of the point on the specimen that is farthest from the center axis of the centrifuge shaft.

[0018] By adopting the above technical solution, the distance L1 of the specimen closest to the central axis of the centrifuge shaft, the distance L2 of the specimen farthest from the central axis of the centrifuge shaft, and the speed n of the centrifuge are measured in real time to ensure that the acceleration N of the specimen can be accurately calculated. a and N b, provides a full range of monitoring of acceleration during the test, and this method can be used to measure whether the specimen is uniform or non-uniform.

[0019] Optionally, the system displays the acceleration upper limit N1, acceleration lower limit N2, and N in real time on the visual interface according to the preset acceleration value N and the tolerance of the specimen acceleration of ±10%. a and N b .

[0020] By adopting the above technical solution, the real-time acceleration value (N a and N b ) and the upper and lower limits of the system's acceleration (N1 and N a ), so that the experimenter can monitor the acceleration of the specimen at a glance and quickly determine whether the acceleration exceeds the tolerance range, so that the operator can intervene or adjust the test parameters in time to ensure data reliability, ensure that the specimen is within the safe range, and avoid test failure or specimen damage.

[0021] Optional, N a and N b The calculation principle is based on the formula: N g =kln 2 ; N g is the acceleration measure, g; k is 1.118×10 -3 ; n is the number of revolutions per minute of the centrifuge arm, r / min; l is the radial distance between the center of rotation and the position of the specimen on the centrifuge arm, m.

[0022] By adopting the above technical solution, the formula is an optimization and simplification of the traditional method of calculating acceleration. The setting of coefficient k is to correct the theoretical formula according to the actual situation of the equipment. This setting makes the calculation more in line with the actual working conditions of the equipment, helps to improve the accuracy of the measurement, and makes the experimental process simpler and more efficient.

[0023] Optionally, the real-time measurement method of L1 is to adjust the first laser rangefinder so that the first laser rangefinder points to the side of the test piece toward the rotating axis of the centrifuge until the first laser rangefinder displays the minimum value X1, and then fix the first laser rangefinder. The structural dimension compensation parameter X2 is preset in the system in advance, L1=X1+X2. When the test piece is centrifuged, if the test piece moves in the centrifugal direction, X1 will change, and L1 will also change in real time.

[0024] Optionally, the real-time measurement method of L2 is that before installing the test piece, the second laser rangefinder measures the distance between it and the circumference of the centrifuge shaft as X3. After installing the test piece, the second laser rangefinder is controlled to move horizontally and up and down around the centrifuge shaft until the second laser rangefinder displays the minimum value X4. The second laser rangefinder is fixed, and the structural dimension compensation parameter X5 is preset in the system in advance, L2=X3-X4+X5. When the test piece is centrifuged, if the test piece moves in the centrifugal direction, X4 will change, and L2 will also change in real time.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The load caused by acceleration is proportional to the distance of the specimen from the rotating axis. Therefore, it is only necessary to measure the distances L1 and L2 of the specimen closest to and farthest from the central axis of the centrifuge shaft in real time, and combine the speed value measured in real time to ensure that the acceleration values ​​of these two points do not exceed the tolerance, so as to achieve real-time monitoring of the acceleration values ​​of the test specimen, ensure that the acceleration changes of each point during the experiment will not exceed the specified range, improve the test accuracy, and do not need to fully monitor the entire specimen surface, thereby reducing the measurement difficulty; 2. Able to meet the needs of specimens of different sizes and shapes, with high adaptability; 3. The first laser rangefinder and the second laser rangefinder will not deviate during the test, ensuring the accuracy of the test data of the specimen; 4. The design of the support frame and the sliding seat disperses the force on the end of the rotating arm, reducing the bending of the rotating arm due to the gravity of the specimen, thereby reducing the position deviation in the measurement of the nearest and farthest points of the specimen. Even in the case of tests with higher speeds and larger specimen weights, the stability and reliability of the test results can be guaranteed; 5. The first laser rangefinder and the second laser rangefinder can not only be used to quickly find the nearest and farthest points of the test piece, but the data of the first laser rangefinder and the second laser rangefinder are directly used in the test, avoiding the errors caused by the intermediate measurement steps or estimates of the traditional method. By directly using the data of the first laser rangefinder and the second laser rangefinder for acceleration calculation, the reliability and accuracy of each test data point are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the structure of the annular frame used to embody the embodiment of the present application.

[0028] Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0029] Figure 4 yes Figure 2 Schematic diagram of the enlarged portion B.

[0030] Figure 5 It is a data diagram for reflecting X1, X2, X3, X4 and X5 in an embodiment of the present application.

[0031] Figure 6 It is a schematic diagram used in an embodiment of the present application to display data on a visual interface.

[0032] Explanation of the accompanying drawings: 1. annular frame; 11. annular slide groove; 2. electromagnetic clutch; 3. rotating column; 31. first slide groove; 4. first laser rangefinder; 5. first adjusting member; 51. first mounting block; 52. first lead screw; 6. sliding seat; 61. arc-shaped slide groove; 7. sliding block; 71. tightening bolt; 72. second adjusting member; 721. second lead screw; 722. second mounting block; 73. second slide groove; 8. second laser rangefinder; 9. speed measuring instrument. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] The embodiment of the present application discloses a device for real-time monitoring of acceleration of a specimen in a centrifugal acceleration test.

[0035] like Figure 1 and Figure 2 The device for real-time monitoring acceleration of a specimen in a centrifugal acceleration test comprises an annular frame 1, a centrifuge is installed in the annular frame 1, the annular frame 1 is coaxially arranged with the centrifuge, an electromagnetic clutch 2 is coaxially installed on the top of the rotating shaft of the centrifuge, a rotating column 3 is connected to the rotor end of the electromagnetic clutch 2, and the rotating column 3 and the rotating shaft of the centrifuge are coaxially arranged.

[0036] like Figure 4 The circumference of the rotating column 3 is provided with two first slide grooves 31, which are arranged along the length direction of the rotating column 3, and are symmetrically arranged about the central axis of the rotating column 3. A first laser rangefinder 4 is slidably arranged in the first slide groove 31. The rotating column 3 is provided with a first adjusting member 5 for adjusting the height position of the first laser rangefinder 4. The first adjusting member 5 includes a first mounting block 51, which is slidably arranged in the first slide groove 31. The first laser rangefinder 4 is bolted to the first mounting block 51. A first lead screw 52 is rotatably connected to the rotating column 3. The first lead screw 52 is arranged along the vertical direction and is located in the first slide groove 31. One end of the first lead screw 52 extends from the top surface of the rotating column 3, and the first lead screw 52 passes through the first mounting block 51 and is threadedly connected. The laser of the first laser rangefinder 4 is emitted along the radial direction of the rotating shaft. The two first laser rangefinders 4 are symmetrically arranged about the central axis of the rotating shaft of the centrifuge.

[0037] like Figure 4 , the end of the rotating arm of the centrifuge away from the central axis is bolted to a sliding seat 6, and the annular frame 1 is provided with an annular groove 11, and the side of the sliding seat 6 away from the rotating arm is slidably arranged in the annular groove 11. The side of the sliding seat 6 facing the centrifuge is an arc surface, and the curvature of the arc surface is the same as the curvature of the annular groove 11. The side of the sliding seat 6 facing the centrifuge is provided with an arc groove 61, and the arc groove 61 is opened along the arc direction of the arc surface. A sliding block 7 is slidably arranged in the arc groove 61, and a tightening bolt 71 is threadedly connected to the sliding block 7. The tightening bolt 71 is pressed against the second groove 73 to press the sliding block 7 against the inner wall of the arc groove 61, thereby fixing the sliding block 7 and the sliding seat 6. The sliding block 7 extends out of the arc groove 61 on the side facing the centrifuge, and the sliding block 7 is provided with a second groove 73 on the side facing the rotating shaft of the centrifuge; The sliding block 7 is provided with a second adjusting member 72, which includes a second mounting block 722 and a second lead screw 721. The second mounting block 722 is slidably connected to the second slide groove 73, and the second mounting block 722 slides along the vertical direction. The second laser rangefinder 8 is installed on the second mounting block 722. The second lead screw 721 is rotatably connected to the sliding block 7, and the second lead screw 721 is arranged along the vertical direction and is threadedly connected to the second mounting block 722. The laser of the second laser rangefinder 8 is emitted along the radial direction of the rotating shaft. When the test piece is not installed, the laser of the second laser rangefinder 8 hits the rotating column 3, and the second laser rangefinder 8 is always located above the rotating arm.

[0038] like Figure 1 A speed measuring instrument 9 is installed on the motor mounting seat of the centrifuge. The laser of the speed measuring instrument 9 is emitted along the radial direction of the rotating shaft and hits the peripheral surface of the rotating shaft. In other embodiments, the speed measuring instrument 9 can also be a photoelectric sensor. A reflective sheet is attached to the rotating shaft, and the photoelectric sensor is aligned with the reflective sheet. When the reflective sheet passes through the monitoring area of ​​the photoelectric sensor, the photoelectric sensor sends a signal, and the time interval between each mark point is recorded to calculate the speed.

[0039] It also includes a data processing system, which is used to receive data from the first laser rangefinder 4, the second laser rangefinder 8 and the speed measuring instrument 9, and display them on a visual interface. At the same time, it calculates the real-time acceleration of the corresponding point of the test piece and displays it on the visual interface. The visual interface also displays the upper and lower acceleration limits preset in the test.

[0040] The implementation principle of the embodiment of the present application is: the load caused by acceleration is proportional to the distance of the specimen from the rotating axis. Therefore, it is only necessary to measure the distances L1 and L2 of the specimen closest to and farthest from the central axis of the centrifuge shaft in real time, and in combination with the speed value measured in real time, ensure that the acceleration values ​​of these two points do not exceed the tolerance, so as to achieve real-time monitoring of the acceleration values ​​of the test specimen, ensure that the acceleration changes of each point during the experiment will not exceed the specified range, improve the test accuracy, and do not need to fully monitor the entire specimen surface, thereby reducing the measurement difficulty.

[0041] Moreover, the first laser rangefinder 4 rotates through the rotating column 3 and moves up and down through the first lead screw 52. The second laser rangefinder 8 moves up and down through the sliding block 7 around the centrifuge shaft and the second lead screw 721. Such a design can meet the requirements of specimens of different sizes and shapes, improves the adaptability of the device, and can meet the requirements of specimens of different sizes and shapes.

[0042] Moreover, the first laser rangefinder 4 is installed on the rotating column 3, and the first lead screw 52 cooperates to fix the position. In addition, the first laser rangefinder 4 is short from the central axis of the rotating shaft, and the centrifugal force on the first laser rangefinder 4 is almost negligible. Therefore, the first laser rangefinder 4 will not deviate during the test, ensuring the accuracy of the test data of the nearest point of the test piece.

[0043] The same is true for the second laser rangefinder 8. The second laser rangefinder 8 is mounted on the sliding block 7, and the second lead screw 721 cooperates to fix the position. During the test, even if the second laser rangefinder 8 is subjected to a large centrifugal force, the second laser rangefinder 8 is supported by the second mounting block 722, the second mounting block 722 is supported by the sliding block 7, the sliding block 7 is supported by the sliding seat 6, and the sliding seat 6 is supported by the annular frame 1. Therefore, the second laser rangefinder 8 will not deviate during the test, thereby ensuring the accuracy of the test data at the farthest point of the specimen.

[0044] The design of the annular frame 1 and the sliding seat 6 disperses the force on the end of the rotating arm, reduces the bending of the rotating arm due to the weight of the specimen, and thus reduces the position deviation in the measurement of the nearest and farthest points of the specimen. Even in the case of a test with a high rotation speed and a large specimen weight, the stability and reliability of the test results can be guaranteed, and the calculation is simple.

[0045] The embodiment of the present application also discloses a method for real-time monitoring of specimen acceleration in a centrifugal acceleration test.

[0046] like Figure 5 and Figure 6 A method for real-time monitoring of acceleration of a specimen in a centrifugal acceleration test is applied to the above-mentioned device for real-time monitoring of acceleration of a specimen in a centrifugal acceleration test, comprising the following steps: S1, the second laser rangefinder 8 emits a laser to hit the rotating column 3, and the system records the measurement data of the second laser rangefinder 8 as X3, and the structural dimension compensation parameters X2 and X5 are preset in the system; The structural dimension compensation parameter X2 is the outer diameter length of the rotating column 3 and the length of the first laser rangefinder 4 itself; The structural dimension compensation parameter X5 is the outer diameter length of the rotating column 3.

[0047] S2, install the test piece on the rotating arm, manually visually find the point where the test piece is closest to the central axis of the centrifuge shaft, then rotate the rotating column 3 and adjust the first screw 52 to make the first laser rangefinder 4 point to the area around the point, and then fine-tune the rotating column 3 and the first screw 52 until the first laser rangefinder 4 displays the smallest value. At this time, it is determined that the point on the test piece irradiated by the first laser rangefinder 4 is the closest point, and the value of the first laser rangefinder 4 is recorded as X1, and the electromagnetic clutch 2 is started to fix the rotating column 3 and the centrifuge shaft; Find the point of the specimen farthest from the central axis of the centrifuge shaft by manual visual inspection, then move the sliding block 7 and adjust the second lead screw 721 to point the second laser rangefinder 8 to the area around the point, and then fine-tune the sliding block 7 and the second lead screw 721 until the second laser rangefinder 8 displays the minimum value. At this time, it is determined that the point on the specimen irradiated by the second laser rangefinder 8 is the farthest point, and the value of the first laser rangefinder 4 is recorded as X4, and the tightening bolt 71 is tightened to fix the sliding block 7 and the sliding seat 6.

[0048] S3, the system presets the acceleration value N, starts the equipment, and the speed measuring instrument 9 measures the centrifuge speed n in real time; Combined with the real-time value X1 of the first laser rangefinder 4 and the structural size compensation parameter X2, the system calculates the distance L1 between the point of the specimen closest to the central axis of the centrifuge shaft and the central axis of the centrifuge shaft in real time, and then combines the real-time speed n to obtain the real-time acceleration value N of the point of the specimen closest to the central axis of the centrifuge shaft. a ; Combined with the real-time value X3 of the second laser rangefinder 8 and the structural size compensation parameter X5, the system calculates the distance L2 between the point of the specimen farthest from the central axis of the centrifuge shaft and the central axis of the centrifuge shaft in real time, and then combines the real-time speed n to obtain the real-time acceleration value N of the point of the specimen closest to the central axis of the centrifuge shaft. b ; N a and N b The calculation principle is based on the formula: N g =kln 2 ; N g is the acceleration measure, g; k is 1.118×10-3 ; n is the number of revolutions per minute of the centrifuge arm, r / min; l is the radial distance between the center of rotation and the position of the specimen on the centrifuge arm, m.

[0049] L1=X1+X2, L2=X3-X4+X5.

[0050] S4. The system displays the acceleration upper limit N1, acceleration lower limit N2, and N in real time on the visual interface according to the preset acceleration value N and the tolerance of the specimen acceleration of ±10%. a and N b If the two rotating arms are placed with specimens for testing at the same time, the visualization interface will display the real-time acceleration of the two specimens, N a1 、N a2 、N b1 and N b2 .

[0051] S5. If the acceleration value exceeds or falls below the upper and lower limits of the preset value by 10% for more than 2-5 seconds, an alarm is triggered and the relevant parameters of the test equipment are checked and adjusted.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for real-time monitoring of specimen acceleration in a centrifugal acceleration test, characterized in that: It comprises an annular frame (1), a first laser rangefinder (4), a second laser rangefinder (8) and a rotation speed measuring instrument (9); An electromagnetic clutch (2) is arranged at the end of the centrifuge shaft, the electromagnetic clutch (2) is connected to a rotating column (3), the first laser rangefinder (4) is arranged on the rotating column (3), the rotating column (3) is provided with a first adjusting member (5) for adjusting the height of the first laser rangefinder (4), and the extended line of the measuring direction of the first laser rangefinder (4) passes through the central axis of the centrifuge; The annular frame (1) is coaxially arranged around the centrifuge; a sliding seat (6) is connected to one end of the rotating arm of the centrifuge away from the central axis; the sliding seat (6) is slidably connected to the annular frame (1); a sliding block (7) is slidably connected to the sliding seat (6); the sliding block (7) slides around the rotating shaft of the centrifuge; the second laser rangefinder (8) is arranged on the sliding block (7); a second adjusting member (72) for adjusting the height of the second laser rangefinder (8) is arranged on the sliding block (7); and the measuring direction of the second laser rangefinder (8) is horizontally directed to the rotating shaft of the centrifuge; The rotation speed measuring instrument (9) is used to measure the rotation speed of the centrifuge in real time.

2. The device for real-time monitoring of specimen acceleration in a centrifugal acceleration test according to claim 1, characterized in that: The rotating column (3) is provided with a first sliding groove (31), the first adjusting member (5) comprises a first mounting block (51), the first mounting block (51) is slidably arranged in the first sliding groove (31), the first laser rangefinder (4) is mounted on the first mounting block (51), the rotating column (3) is rotatably connected to a first lead screw (52), and the first mounting block (51) is threadedly connected to the first lead screw (52).

3. The device for real-time monitoring of specimen acceleration in a centrifugal acceleration test according to claim 1, characterized in that: The sliding block (7) is fixed to the sliding seat (6) by a tightening bolt (71); the sliding block (7) is provided with a second sliding groove (73); the second adjusting member (72) comprises a second mounting block (722); the second mounting block (722) is slidably arranged in the second sliding groove (73); the second laser rangefinder (8) is mounted on the second mounting block (722); the sliding block (7) is rotatably connected to a second lead screw (721); the second mounting block (722) is threadedly connected to the second lead screw (721).

4. The device for real-time monitoring of specimen acceleration in a centrifugal acceleration test according to claim 1, characterized in that: Two of the first laser rangefinders (4) are provided, and the two first laser rangefinders (4) are symmetrically arranged about the central axis of the centrifuge shaft.

5. A method for real-time monitoring of specimen acceleration in a centrifugal acceleration test, characterized in that: A device for real-time monitoring of acceleration of a specimen used in a centrifugal acceleration test according to any one of claims 1 to 4, comprising the following steps: Real-time measurement of the distance L1 between the point of the specimen closest to the central axis of the centrifuge shaft and the central axis of the centrifuge shaft; Real-time measurement of the distance L2 between the point of the specimen farthest from the central axis of the centrifuge shaft and the central axis of the centrifuge shaft; Real-time measurement of the centrifuge speed n, the system presets the acceleration value N, and calculates N based on the values ​​of L1, L2 and n a and N b ; N a is the acceleration value of the point of the specimen closest to the center axis of the centrifuge shaft, N b It is the acceleration value of the point on the specimen that is farthest from the center axis of the centrifuge shaft.

6. The method for real-time monitoring of specimen acceleration in a centrifugal acceleration test according to claim 5, characterized in that: The system displays the acceleration upper limit N1, acceleration lower limit N2, and N in real time on the visual interface according to the preset acceleration value N and the tolerance of the specimen acceleration of ±10%. a and N b .

7. The method for real-time monitoring of specimen acceleration in a centrifugal acceleration test according to claim 5, characterized in that: N a and N b The calculation principle is based on the formula: N g =kln 2 ; N g is the acceleration value, g; k is 1.118×10 -3 ; n is the number of revolutions per minute of the centrifuge arm, r / min; l is the radial distance between the center of rotation and the position of the specimen on the centrifuge arm, m.

8. The method for real-time monitoring of specimen acceleration in a centrifugal acceleration test according to claim 5, characterized in that: The real-time measurement method of L1 is to adjust the first laser rangefinder (4) so ​​that the first laser rangefinder (4) points to the side of the test piece facing the centrifuge rotation axis until the first laser rangefinder (4) displays a minimum value X1, and then fix the first laser rangefinder (4). The structural dimension compensation parameter X2 is preset in the system in advance, L1=X1+X2. When the test piece is centrifuged, if the test piece moves in the centrifugal direction, X1 will change, and L1 will also change in real time.

9. The method for real-time monitoring of specimen acceleration in a centrifugal acceleration test according to claim 5, characterized in that: The real-time measurement method of L2 is as follows: before installing the test piece, the second laser rangefinder (8) measures the distance between the test piece and the peripheral surface of the centrifuge shaft as X3; after installing the test piece, the second laser rangefinder (8) is controlled to move horizontally and vertically around the centrifuge shaft until the second laser rangefinder (8) displays a minimum value X4; the second laser rangefinder (8) is fixed, and a structural dimension compensation parameter X5 is preset in the system in advance, L2=X3-X4+X5; when the test piece is centrifuged, if the test piece moves in the centrifugal direction, X4 will change, and L2 will also change in real time.

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