CN112710427A - Large centrifuge quality and mass center testing system - Google Patents
Large centrifuge quality and mass center testing system Download PDFInfo
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- CN112710427A CN112710427A CN202011551953.9A CN202011551953A CN112710427A CN 112710427 A CN112710427 A CN 112710427A CN 202011551953 A CN202011551953 A CN 202011551953A CN 112710427 A CN112710427 A CN 112710427A
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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
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/12—Static balancing; Determining position of centre of gravity
- G01M1/122—Determining position of centre of gravity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
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Abstract
The invention provides a mass and mass center testing system of a large centrifuge, which comprises: the system comprises a measuring platform, a sensor and a data acquisition and processing system; the measuring platform comprises: the device comprises a base, a cantilever platform with a hinge point, a main shaft lifting mechanism and a tray; the base for supporting the measuring platform is arranged at the bottom; the cantilever platform is connected with the base through a hinge point, and a main shaft lifting mechanism for lifting is arranged in the platform; the tray is arranged above the cantilever platform with the hinge point; the bases are connected through welding and are horizontally arranged; the base is hinged with the measuring platform through a pin shaft, so that the measuring platform can rotate around a hinge point by 30 degrees and is controlled by a hydraulic cylinder at the front end of the platform. The invention changes the reference plane of the mass center measurement, improves the measurement precision and fills the blank of high-precision measurement of the mass center of the component with large weight, large volume and large gyration radius in China.
Description
Technical Field
The invention relates to the technical field of mass and mass center testing, in particular to a mass and mass center testing system of a centrifugal machine.
Background
At present, in a domestic mass center testing system related to a cannonball, small pieces such as the cannonball adopt a horizontal mode, and the radius of rotation along an axis is small; there are also a blade method and a suspension wire method. However, the mass center testing system related to the cannonball in China only aims at light weight and small volume, and cannot test equipment with large weight, large volume and irregularity. Small pieces such as shells and the like adopt a horizontal mode, the radius of rotation along the axis is small, but the rotating arm length of a large centrifugal machine is more than 13 meters, the rotation around the center is difficult to realize in a horizontal mode, the accuracy of vertical measurement is difficult to guarantee, and the key is that the whole structure and the test principle need to be redesigned and calculated. Resulting in a complex and less accurate overall measurement process. Meanwhile, the cutting edge method and the disconnection method cannot meet the precision requirement of the mass center deviation.
Disclosure of Invention
According to the technical problems of complex process and low precision, the mass and center of mass testing system of the centrifuge is provided. The invention mainly utilizes a mass and mass center testing system of a large centrifuge, which is characterized by comprising the following components: the system comprises a measuring platform, a sensor and a data acquisition and processing system; the measurement platform comprises: the device comprises a base, a cantilever platform with a hinge point, a main shaft lifting mechanism and a tray;
the base for supporting the measuring platform is arranged at the bottom; the cantilever platform is connected with the base through a hinge point, and a main shaft lifting mechanism for lifting is arranged in the platform; the tray is arranged above the cantilever platform with the hinge point; the bases are connected through welding and are horizontally arranged; the base is hinged with the measuring platform through a pin shaft, so that the measuring platform can rotate around a hinge point by 30 degrees and is controlled by a hydraulic cylinder at the front end of the platform.
Still further, the measurement platform further has: positioning the main shaft; the positioning main shaft and the sliding bearing which are composed of two sections are assembled on a central hole in the cantilever platform.
Furthermore, the cantilever platform is also provided with a cushion block and a sliding plate; a hydraulic cylinder is arranged between the base and the measuring platform, and the center of the measuring platform is coincided with the center of the shaft; the main shaft moves up and down through the hydraulic cylinder.
And further, assembling and fixing the turntable bearing and the measuring platform, assembling and fixing the large tray and the turntable bearing, and assembling and positioning a section of the main shaft and the positioning taper sleeve.
Further, a centroid measuring coordinate system is used, and the centroid test is carried out by measuring the numerical values of the tested piece under different states through the sensor.
Further, the measured piece is accurately positioned through the positioning main shaft, and the X, Y, Z three-direction mass center of the component can be measured through the arrangement mode and the measuring mode of the rotating eccentricity.
Further, the sensor is an HBM high accuracy sensor.
Further, the test accuracy of the test system reaches 0.2mm in an X, Y plane and reaches 0.5mm in the Z direction.
Compared with the prior art, the invention has the following advantages:
the mass and mass center testing system can measure the mass and mass center of a large complex structural part, and is particularly successfully applied to a rotating arm system of a large centrifuge. The method changes the reference plane of the centroid measurement, improves the measurement precision, and has automation and intellectualization. The blank of high-precision measurement of the mass center of a component with large weight, large volume and large turning radius in China is filled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the overall apparatus of the present invention.
FIG. 2 is a schematic view of the structure of the apparatus of the present invention 1.
FIG. 3 is a schematic view of the structure of the apparatus of the present invention 2.
FIG. 4 is a schematic cross-sectional view of the present invention B-B.
FIG. 5 is a schematic cross-sectional view of the present invention at C-C.
Fig. 6 is a perspective view of the device of the present invention.
FIG. 7 is a schematic view of the overall control flow of the present invention.
1 is a measuring platform; 2, a spherical support; a weighing sensor base is shown as 3; 4 is a turntable bearing tray; 5 is a turntable bearing; 6 is a screw I; 7 is a positioning main shaft 1 section; 8 is a positioning taper sleeve; 9 is a positioning main shaft 2 section; 10 is a big tray; 11 is a positioning pin shaft; 12 is a hydraulic cylinder 2; 13 is a base platform; 14 is a weighing sensor I; 15 is a weighing sensor II; 16 is a protection device; 17 is a hydraulic cylinder I; 18 is a sliding bearing; 19 is a cushion block I; 20 is a gasket II; 21 is a weighing sensor positioner; 22 is a sliding plate; 23 is a screw II; and 24 is a pin shaft.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1-7, the present invention provides a mass, centroid testing system for large centrifuges.
Since the rotating component will vibrate when rotating around its rotation axis if its center of mass is deviated a lot, and will be fatal in severe cases. So it is required to design the center of mass deviation less than a certain value or to require a strict static balance level.
The mass and mass center measuring platform of the large-scale centrifugal machine is applied to the large-scale centrifugal machine and the large-scale blades. Such devices have a large radius of gyration (up to 7 meters) and can be considered as a large dish rotating to ensure that the center of mass of the dish is offset from its axis of rotation to meet the requirements.
The new coordinate system for measuring mass center is that the previous equipment for measuring mass center by consulting data takes the mass center of the cannonball as an example, the equipment action is to rotate the cannonball by 0 to 360 degrees, the cannonball is horizontally placed (laid) only to rotate the cannonball around the revolution center of the cannonball to measure various angles (the rotation axis of the cannonball is horizontal, and the coordinate system of mass center is vertical to the rotation axis). The centre of mass test of the rotating arm system of the large-scale centrifuge, which we want to do, cannot realize the arrangement mode of the centrifuge rotating arm like a cannonball because the rotating arm of the centrifuge is too long, we can arrange the centrifuge rotating arm horizontally, which is different from the arrangement mode of the cannonball described above because the rotating shaft of the centrifuge rotating arm is vertical and the coordinate system of the centre of mass is horizontal.
When the two modes are used for measurement, the placement mode of the sensors is the same, so that the calculation method and the precision level of the sensors are changed, and therefore, the new centroid test coordinate system is applied. Is the result of the comparison.
The system of the invention comprises: a mass, centroid testing system for large centrifuges, comprising: the system comprises a measuring platform, a sensor and a data acquisition and processing system; the measurement platform comprises: the device comprises a base, a cantilever platform with a hinge point, a main shaft lifting mechanism and a tray;
the base for supporting the measuring platform is arranged at the bottom; the cantilever platform is connected with the base through a hinge point, and a main shaft lifting mechanism for lifting is arranged in the platform; the tray is arranged above the cantilever platform with the hinge point;
the bases are connected through welding and are horizontally arranged; the base is hinged with the measuring platform through a pin shaft, so that the measuring platform can rotate around a hinge point by 30 degrees and is controlled by a hydraulic cylinder at the front end of the platform.
Preferably, the measurement platform further includes: positioning the main shaft; the positioning main shaft and the sliding bearing which are composed of two sections are assembled on a central hole in the cantilever platform.
In the application, the cantilever platform is also provided with a cushion block and a sliding plate; a hydraulic cylinder is arranged between the base and the measuring platform, and the center of the measuring platform is coincided with the center of the shaft; the main shaft moves up and down through the hydraulic cylinder.
As a preferred embodiment, the turntable bearing is fixedly assembled with the measuring platform, the large tray and the turntable bearing are fixedly assembled, and the positioning main shaft section and the positioning taper sleeve are assembled. Meanwhile, a mass center measurement coordinate system is applied, and the mass center test is carried out by measuring the numerical values of the tested piece in different states through the sensor.
In the invention, the measured piece is accurately positioned through the positioning main shaft, and the X, Y, Z three-direction mass center of the component can be measured through the arrangement mode and the measuring mode of the rotating eccentricity.
Preferably, the sensor is an HBM high-precision sensor. The test system has the test accuracy of 0.2mm in the X, Y plane and 0.5mm in the Z direction.
Example (b):
as an embodiment of the present invention, a detection method using the above system:
1. firstly, a measured piece is accurately placed on a large tray through a positioning main shaft and a positioning taper sleeve;
2. and (3) jacking the hydraulic pressure 1, jacking the positioning main shaft 2 section at the moment, and jacking the turntable bearing and the large tray, namely jacking the measured part. Three weighing sensors are placed in a three-point weighing mode, the tray is dropped, the tray is enabled to completely act on the weighing sensors, and data are read (participate in calculation).
And jacking up, taking down the weighing sensor, and falling down to enable the measured piece to act on the measuring and measuring platform.
3. Jacking up the hydraulic cylinder 2, placing the weighing sensor at the position 1, and dropping down the hydraulic cylinder 2 to enable the cantilever to act on the weighing sensor to read data;
4. pulling down the positioning pin shaft, rotating the tested piece to 90 degrees, 180 degrees and 270 degrees, installing the positioning pin shaft, and reading out sensor data after the positioning pin shaft is stabilized;
5. jacking up the hydraulic cylinder 2, adding a gasket at the position 1, placing a weighing sensor, dropping the hydraulic cylinder to enable the cantilever to act on the weighing sensor, and reading data;
6. and obtaining related parameters such as the total weight, the mass center coordinate and the like of the measured piece through a developed control calculation system program.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A mass, centroid testing system for large centrifuges, comprising: the system comprises a measuring platform, a sensor and a data acquisition and processing system; the measurement platform comprises: the device comprises a base, a cantilever platform with a hinge point, a main shaft lifting mechanism and a tray;
the base for supporting the measuring platform is arranged at the bottom; the cantilever platform is connected with the base through a hinge point, and a main shaft lifting mechanism for lifting is arranged in the platform; the tray is arranged above the cantilever platform with the hinge point;
the bases are connected through welding and are horizontally arranged; the base is hinged with the measuring platform through a pin shaft, so that the measuring platform can rotate around a hinge point by 30 degrees and is controlled by a hydraulic cylinder at the front end of the platform.
2. The mass, centroid testing system for large scale centrifuge as recited in claim 1 wherein said measurement platform further comprises: positioning the main shaft; the positioning main shaft and the sliding bearing which are composed of two sections are assembled on a central hole in the cantilever platform.
3. The mass and mass center testing system of the large centrifuge according to claim 1, wherein the cantilever platform is further provided with a cushion block and a sliding plate; a hydraulic cylinder is arranged between the base and the measuring platform, and the center of the measuring platform is coincided with the center of the shaft; the main shaft moves up and down through the hydraulic cylinder.
4. The mass and mass center testing system of the large centrifuge as claimed in claim 1, wherein the turntable bearing is fixedly assembled with the measuring platform, the large tray is fixedly assembled with the turntable bearing, and the positioning spindle section and the positioning taper sleeve are fixedly assembled.
5. The mass and mass center testing system of the large centrifuge as claimed in claim 1, wherein the mass center testing is performed by measuring the values of the tested piece under different states by the sensor by using a mass center measuring coordinate system.
6. The mass, center of mass testing system of a large centrifuge of claim 1, wherein: the measured piece is accurately positioned through the positioning main shaft, and the center of mass of X, Y, Z three directions of the component can be measured through the arrangement mode and the measuring mode of the rotating eccentricity.
7. The mass, center of mass testing system of a large centrifuge of claim 1, wherein: the sensor is an HBM sensor.
8. The mass, center of mass testing system of a large centrifuge of claim 1, wherein:
the test system has the test accuracy of 0.2mm in the X, Y plane and 0.5mm in the Z direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011551953.9A CN112710427A (en) | 2020-12-24 | 2020-12-24 | Large centrifuge quality and mass center testing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011551953.9A CN112710427A (en) | 2020-12-24 | 2020-12-24 | Large centrifuge quality and mass center testing system |
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| Publication Number | Publication Date |
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| CN112710427A true CN112710427A (en) | 2021-04-27 |
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| CN202011551953.9A Pending CN112710427A (en) | 2020-12-24 | 2020-12-24 | Large centrifuge quality and mass center testing system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2574896A2 (en) * | 2011-09-28 | 2013-04-03 | Fundación Centro de Tecnologias Aeronáuticas | Device for determining the inertia tensors and the positions of the centres of gravity in three dimensions |
| CN205679359U (en) * | 2016-06-03 | 2016-11-09 | 西安百纳电子科技有限公司 | A kind of aero-engine quality center of mass deflection angle measuring device |
| CN106248299A (en) * | 2016-07-11 | 2016-12-21 | 上海卫星装备研究所 | A kind of based on multi-dimensional force barycenter test system |
| CN109115403A (en) * | 2018-08-16 | 2019-01-01 | 孝感市宝龙电子有限公司 | A kind of quality characteristic integration integral test system and test method |
| CN209387200U (en) * | 2018-10-25 | 2019-09-13 | 郑州机械研究所有限公司 | Center torsion bar type mass of object, mass center and rotation inerttia mechanism |
-
2020
- 2020-12-24 CN CN202011551953.9A patent/CN112710427A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2574896A2 (en) * | 2011-09-28 | 2013-04-03 | Fundación Centro de Tecnologias Aeronáuticas | Device for determining the inertia tensors and the positions of the centres of gravity in three dimensions |
| CN205679359U (en) * | 2016-06-03 | 2016-11-09 | 西安百纳电子科技有限公司 | A kind of aero-engine quality center of mass deflection angle measuring device |
| CN106248299A (en) * | 2016-07-11 | 2016-12-21 | 上海卫星装备研究所 | A kind of based on multi-dimensional force barycenter test system |
| CN109115403A (en) * | 2018-08-16 | 2019-01-01 | 孝感市宝龙电子有限公司 | A kind of quality characteristic integration integral test system and test method |
| CN209387200U (en) * | 2018-10-25 | 2019-09-13 | 郑州机械研究所有限公司 | Center torsion bar type mass of object, mass center and rotation inerttia mechanism |
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Application publication date: 20210427 |