CN106877562B - Torsional vibration loading device excited by eccentric motor - Google Patents
Torsional vibration loading device excited by eccentric motor Download PDFInfo
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- CN106877562B CN106877562B CN201710046019.3A CN201710046019A CN106877562B CN 106877562 B CN106877562 B CN 106877562B CN 201710046019 A CN201710046019 A CN 201710046019A CN 106877562 B CN106877562 B CN 106877562B
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- eccentric motor
- brush
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- electrode ring
- rotating shaft
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
- H02K7/075—Means for converting reciprocating motion into rotary motion or vice versa using crankshafts or eccentrics
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The utility model provides a torsional vibration loading device excited by eccentric motor, the center of vibration excitation arm of force and the centre of a circle fixed connection of vibration excitation barrel holder bottom surface, first eccentric motor and second eccentric motor are fixed respectively at the both ends of vibration excitation arm of force, positive electrode ring and negative electrode ring are installed on the outer cylinder wall of fixing at vibration excitation barrel holder, positive electrode ring and negative electrode ring are connected with first eccentric motor and second eccentric motor through the wire respectively, positive brush and negative brush are all fixed on the brush base, positive brush and positive electrode ring contact, negative brush and negative electrode ring contact, positive brush and negative brush are connected to the power, pivot one end fixed connection is in the centre of a circle department of vibration excitation barrel holder bottom surface. The rotating shaft is driven by the power source to rotate, the excitation cylinder frame rotates along with the rotating shaft, periodic tangential force generated by the eccentric motor causes periodic moment at the circle center, so that the rotating shaft is subjected to torsional excitation, the function of applying torsional excitation to the rotating shaft is realized, the structure is simple and compact, the implementation is more convenient, and the performance is more reliable.
Description
Technical Field
The invention relates to the field of machinery, in particular to a torsional vibration loading device excited by an eccentric motor.
Background
The eccentric motor has strong impact capability, is widely applied to various excitation occasions, can carry out torsional vibration loading on rotating shaft parts in a torsional vibration excitation mode in many occasions in engineering, such as fatigue tests and torsional vibration tests of rotating parts of engine crankshafts, turbine generators, ship shafting and the like, and carries out modal analysis and vibration response analysis so as to know the performances of the shafting parts, simulate the dynamic performances of the shafting parts under certain working conditions and acquire related test data. The residual stress of the rotating shaft parts is eliminated by adopting the dynamic stress generated by bending-torsion coupling resonance, torsional vibration excitation needs to be applied to the rotating shaft in the implementation process, when the rotation frequency of the motor is equal to the difference between the bending natural frequency and the torsional natural frequency, the applied torsional vibration excitation is equal to the torsional natural frequency, the bending resonance is excited by the bending-torsion coupling theory at the same time by the eccentric rotating shaft, and the bending resonance and the torsional resonance are mutually reinforced to generate enough dynamic stress. The currently adopted torsional vibration exciter comprises an electromagnetic vibration exciter, a pneumatic vibration exciter and a hydraulic vibration exciter, however, the vibration exciters are complex in structure, low in reliability, high in price, high in maintenance cost, difficult to implement and difficult to popularize and use.
Disclosure of Invention
The invention aims to provide a torsional vibration loading device excited by an eccentric motor, which is rigidly connected with an excitation rack through a rotating shaft, a vibrating force arm is rigidly connected with the rack, two eccentric motors are respectively and fixedly connected with the tail ends of excitation force arms, and the two eccentric motors are respectively and symmetrically arranged on two sides by taking the center of the force arm as the center. The rotating shaft is driven by a power source to rotate, and the exciting force arm and the frame rotate together with the rotating shaft due to the rigid connection with the rotating shaft. The periodic tangential force generated by the eccentric motor causes periodic moment at the center of a circle, so that the rotating shaft is excited by torsional vibration.
The invention achieves the aim through the following technical scheme:
a torsional vibration loading device excited by an eccentric motor comprises a rotating shaft, an excitation cylinder frame, an excitation force arm, a positive electrode ring, a negative electrode ring, a first eccentric motor, a second eccentric motor, a positive brush, a negative brush and a brush base;
the center of the exciting force arm is fixedly connected with the center of the bottom surface of the exciting cylinder frame, the first eccentric motor and the second eccentric motor are respectively fixed at two ends of the exciting force arm,
the positive electrode ring and the negative electrode ring are arranged on the outer cylinder wall fixed on the excitation cylinder frame and are respectively connected with the first eccentric motor and the second eccentric motor through wires,
the positive brush and the negative brush are fixed on the brush base, the positive brush is contacted with the positive electrode ring, the negative brush is contacted with the negative electrode ring, the positive brush and the negative brush are connected to a power supply,
one end of the rotating shaft is fixedly connected with the center of the bottom surface of the excitation cylinder frame.
The excitation force arm and the first eccentric motor and the second eccentric motor which are respectively arranged at the two ends of the excitation force arm form central symmetry with the center of the excitation force arm, so that torque is generated on the rotating shaft.
The other two end parts of the exciting force arm are in a suspended state except the joint of the center and the exciting cylinder frame.
The invention has the outstanding advantages that:
the vibration exciter is mainly composed of mechanical parts, has high reliability, simple and compact structure, convenient and simple installation, high strength of parts, adaptability to larger vibration excitation range, adjustable vibration excitation arm, adjustable arrangement mode and position of the eccentric motor, and compared with electromagnetic torsional vibration motors, hydraulic and pneumatic torsional vibration exciters, the torsional vibration mode and principle of the eccentric motor are simpler, the vibration exciter is more convenient to implement, the working performance is more reliable, the production cost is reduced, the economic benefit is improved, the vibration excitation force generated by the eccentric motor is adjusted by eccentric mass, eccentric distance and rotating speed of the eccentric motor, the eccentric mass is easy to replace and adjust, the vibration excitation arm can be adjusted according to the actual condition of the test parts, the flexibility is strong, the adaptability is wide, the stepless speed regulation can be realized in the rated rotating speed range, the cost is low, the maintenance is easy, and the application range of the torsional vibration exciter is greatly expanded.
Drawings
Fig. 1 is a schematic diagram of a torsional vibration exciter excited by an eccentric motor according to the present invention.
Fig. 2 is a front view of a torsional vibration exciter excited by an eccentric motor in accordance with the present invention.
Fig. 3 is a right side view of a torsional vibration exciter excited by an eccentric motor in accordance with the present invention.
Fig. 4 is an enlarged schematic view of the position a in fig. 3.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
The torsional vibration loading device excited by the eccentric motor comprises a rotating shaft 1, an excitation cylinder frame 2, an excitation force arm 3, a positive electrode ring 6, a negative electrode ring 5, a first eccentric motor 4, a second eccentric motor 10, a positive brush 8, a negative brush and a brush base 7;
the center of the exciting force arm 3 is fixedly connected with the center of the bottom surface of the exciting cylinder frame 2, a first eccentric motor 4 and a second eccentric motor 10 are respectively fixed at two ends of the exciting force arm 3,
the positive electrode ring 6 and the negative electrode ring 5 are arranged on the outer cylinder wall fixed on the excitation cylinder frame 2, the positive electrode ring 6 and the negative electrode ring 5 are respectively connected with the first eccentric motor 4 and the second eccentric motor 10 through leads 9,
a positive brush 8 and a negative brush are fixed on the brush base 7, the positive brush 8 is contacted with the positive electrode ring 6, the negative brush is contacted with the negative electrode ring 5, the positive brush 8 and the negative brush are connected to a power supply,
one end of the rotating shaft 1 is fixedly connected with the center of the bottom surface of the excitation cylinder frame 2.
Further, the exciting force arm 3 and the first eccentric motor 4 and the second eccentric motor 10 respectively installed at two ends of the exciting force arm 3 form central symmetry with the center of the exciting force arm 3, so as to generate torque to the rotating shaft 1.
Furthermore, the other two end parts of the exciting force arm 3 are in a suspended state except the connecting part of the center and the exciting cylinder frame 2.
When the rotary shaft 1 is rotated by a power source, the motor drives the rotary shaft 1 to rotate, the rotary shaft 1 drives the torsional vibration exciter to rotate, power wires of the first eccentric motor 4 and the second eccentric motor 10 pass through holes in the excitation cylinder frame 2 through wires 9 to be connected with the positive electrode ring 6 and the negative electrode ring 5, and when the rotary shaft 1 is rotated, the positive electrode ring 6 and the negative electrode ring 5 are always kept in contact with the positive brush 8 and the negative brush, so that power and signals are provided for the first eccentric motor 4 and the second eccentric motor 10. The first eccentric motor 4 and the second eccentric motor 10 are connected with a power supply to start and then vibrate, so that the exciting force arm 3 vibrates and further generates torque to the rotating shaft 1. The excitation frame is cylindrical, the positive electrode ring 6 and the negative electrode ring 5 are coaxially arranged on the outer wall surface of the cylinder of the cylindrical excitation frame, and the bottom surface is arranged at one end or the bottom surfaces are arranged at both ends of the cylindrical excitation frame.
Torsional vibration output by the torsional vibration exciter is applied to the rotating shaft 1 of high rigidity whenRotation frequency of the rotary shaft 1 Rate ofEqual toNatural frequency of bendingAnd (3) withNatural frequency of torsionWhen the bending resonance and torsional resonance are different, the bending resonance can be simultaneously excited by torsional vibration excitation with the frequency equal to the torsional natural frequency by the bending-torsional coupling resonance theory, and the bending resonance and the torsional resonance are mutually reinforced to generate enough dynamic stress to eliminate the residual stress of the high-rigidity rotating shaft 1.
Claims (1)
1. The torsional vibration loading device excited by the eccentric motor is characterized by comprising a rotating shaft, an excitation cylinder frame, an excitation force arm, a positive electrode ring, a negative electrode ring, a first eccentric motor, a second eccentric motor, a positive brush, a negative brush and a brush base;
the center of the exciting force arm is fixedly connected with the center of the bottom surface of the exciting cylinder frame, the first eccentric motor and the second eccentric motor are respectively fixed at two ends of the exciting force arm,
the positive electrode ring and the negative electrode ring are arranged on the outer cylinder wall fixed on the excitation cylinder frame and are respectively connected with the first eccentric motor and the second eccentric motor through wires,
the positive brush and the negative brush are fixed on the brush base, the positive brush is contacted with the positive electrode ring, the negative brush is contacted with the negative electrode ring, the positive brush and the negative brush are connected to a power supply,
one end of the rotating shaft is fixedly connected to the center of the bottom surface of the excitation cylinder frame;
the excitation force arm and the first eccentric motor and the second eccentric motor which are respectively arranged at the two ends of the excitation force arm form central symmetry with the center of the excitation force arm, so that torque is generated on the rotating shaft;
the other two end parts of the exciting force arm are in a suspended state except the joint of the center and the exciting cylinder frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710046019.3A CN106877562B (en) | 2017-01-20 | 2017-01-20 | Torsional vibration loading device excited by eccentric motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710046019.3A CN106877562B (en) | 2017-01-20 | 2017-01-20 | Torsional vibration loading device excited by eccentric motor |
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| Publication Number | Publication Date |
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| CN106877562A CN106877562A (en) | 2017-06-20 |
| CN106877562B true CN106877562B (en) | 2023-05-05 |
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| CN201710046019.3A Active CN106877562B (en) | 2017-01-20 | 2017-01-20 | Torsional vibration loading device excited by eccentric motor |
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| CN115824841B (en) * | 2023-02-07 | 2023-05-09 | 浙大城市学院 | Rock-soil body tensile shear and compressive shear coupling stress measurement method |
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| CN1041295A (en) * | 1988-09-30 | 1990-04-18 | 哈尔滨工业大学 | A kind of vibration excitor with time effect |
| EP0646435A1 (en) * | 1993-09-30 | 1995-04-05 | Taga Electric Co. Ltd. | Rotary machining device, body thereof, and rotary tools therefor |
| CN102107691A (en) * | 2011-02-24 | 2011-06-29 | 奇瑞汽车股份有限公司 | Vehicle suspension stress releasing device |
| CN104568616A (en) * | 2015-01-15 | 2015-04-29 | 中交公路长大桥建设国家工程研究中心有限公司 | Deck structure wheel rolling fatigue loading test platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044240A (en) * | 1989-01-20 | 1990-08-01 | 克拉马托尔斯克工业学院 | Vibration exciter |
| US5303681A (en) * | 1992-08-28 | 1994-04-19 | Cummins Engine Company, Inc. | Torsional tunable coupling for a diesel engine drive shaft |
| CN2239298Y (en) * | 1995-04-11 | 1996-11-06 | 包头市永磁电机研究所 | Exciter |
| JPH1194691A (en) * | 1997-09-24 | 1999-04-09 | Sekisui Chem Co Ltd | Exciter |
| DE102008046792A1 (en) * | 2007-09-20 | 2009-04-02 | Heidelberger Druckmaschinen Ag | Printing machine with bearer rings |
| CN101762371B (en) * | 2010-01-29 | 2011-06-22 | 重庆建设摩托车股份有限公司 | Device for testing torsion and vibration of rotor of revolution vane minitype compressor and test method |
| CN102212672B (en) * | 2011-04-22 | 2013-03-06 | 广西大学 | Flexural coupling resonance type vibratory stress relief device and implementation method thereof |
| CN102321793B (en) * | 2011-10-08 | 2013-05-08 | 广西大学 | Vibratory stress relief apparatus for medium frequency and low frequency shaft type parts, and use method thereof |
| CN202663321U (en) * | 2012-05-22 | 2013-01-09 | 南京航空航天大学 | Rotary ultrasonic motor excited by bending oscillators |
| CN104032125B (en) * | 2013-12-17 | 2016-05-18 | 广西大学 | A kind of alternate torque excites the horizontal coupled resonance oscillation time-effect method of turning round |
| CN105424335B (en) * | 2015-11-04 | 2018-06-05 | 中国直升机设计研究所 | A kind of rotor control device |
| CN206575287U (en) * | 2017-01-20 | 2017-10-20 | 广西大学 | A kind of torsional oscillation loading device excited by eccentric motor |
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2017
- 2017-01-20 CN CN201710046019.3A patent/CN106877562B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041295A (en) * | 1988-09-30 | 1990-04-18 | 哈尔滨工业大学 | A kind of vibration excitor with time effect |
| EP0646435A1 (en) * | 1993-09-30 | 1995-04-05 | Taga Electric Co. Ltd. | Rotary machining device, body thereof, and rotary tools therefor |
| CN102107691A (en) * | 2011-02-24 | 2011-06-29 | 奇瑞汽车股份有限公司 | Vehicle suspension stress releasing device |
| CN104568616A (en) * | 2015-01-15 | 2015-04-29 | 中交公路长大桥建设国家工程研究中心有限公司 | Deck structure wheel rolling fatigue loading test platform |
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| CN106877562A (en) | 2017-06-20 |
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