CN106802237B - Cam impact type alternating torque loading device - Google Patents
Cam impact type alternating torque loading device Download PDFInfo
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- CN106802237B CN106802237B CN201710053570.0A CN201710053570A CN106802237B CN 106802237 B CN106802237 B CN 106802237B CN 201710053570 A CN201710053570 A CN 201710053570A CN 106802237 B CN106802237 B CN 106802237B
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
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Abstract
A cam impact alternating torque loading device is characterized in that the center of an excitation force arm is fixedly connected with the circle center of the bottom surface of an excitation cylinder frame, a first actuating motor and a second actuating motor are respectively fixed on the bottom surface of the excitation cylinder frame and are close to the positions of two ends of the excitation force arm, a first actuating cam is arranged on the first actuating motor, a positive electrode ring and a negative electrode ring are arranged on the outer cylinder wall fixed on the excitation cylinder frame, a positive brush and a negative brush are both fixed on a 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, and one end of a rotating shaft is fixedly connected to the circle center of the bottom surface of the excitation cylinder frame. The rotating shaft is driven by a power source to rotate, the excitation cylinder frame rotates along with the rotating shaft, and alternating tangential force generated by the actuating cam causes alternating torque at the circle center, so that the rotating shaft is excited by torsional vibration. The function of applying torsional vibration excitation to the rotating shaft is realized, the structure is simple and compact, the reliability is good, and the torsional vibration excitation effect is obvious.
Description
Technical Field
The invention relates to the field of machinery, in particular to a cam impact alternating torque loading device.
Background
In many occasions in engineering, torsional vibration excitation mode is used to perform torsional vibration loading on rotating shaft parts, such as fatigue test and torsional vibration test of rotating parts of engine crankshafts, turbine generators, ship shafting and the like, modal analysis and vibration response analysis are performed to know the performances of the shafting parts, simulate the dynamic performances of the shafting parts under certain working conditions and acquire relevant 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 cam impact type alternating torque loading device, which is rigidly connected with an excitation rack through a rotating shaft, an excitation power arm is rigidly connected with the excitation rack, two actuating cams are respectively and fixedly connected with the tail ends of the excitation power arms, and the two actuating cams are respectively and symmetrically arranged on two sides by taking the center of the power arm as the center. The rotating shaft is driven by a power source to rotate, and the exciting force arm and the exciting rack rotate together with the rotating shaft due to the rigid connection with the rotating shaft. The alternating tangential force generated by the actuating cam causes alternating torque at the center of the circle, so that the rotating shaft is excited by torsional vibration.
The invention achieves the aim through the following technical scheme:
a cam impact alternating torque loading device comprises a rotating shaft, an excitation cylinder frame, an excitation force arm, a positive electrode ring, a negative electrode ring, a first actuating motor, a second actuating motor, a first actuating cam, a second actuating cam, 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 actuating motor and the second actuating motor are respectively fixed on the bottom surface of the exciting cylinder frame and are close to the two ends of the exciting force arm, the first actuating cam is arranged on the first actuating motor, and the second actuating cam is arranged on the second rotating motor;
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 actuating motor and the second actuating 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, the first actuating motor, the second actuating motor, the first actuating cam and the second actuating cam are formed to be centrosymmetric with the center of the excitation force arm when being installed, and further 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 mostly composed of mechanical parts, has the advantages of high reliability, simple and compact structure, convenient and simple installation, high strength of the parts, adaptability to a larger excitation range, adjustable excitation arm, adjustable arrangement mode of the actuating cam, excitation force and excitation frequency of the actuating cam controlled by an external variable-frequency power supply, capability of being adjusted according to actual conditions of test parts, strong flexibility, low cost, easy maintenance and obvious effect, and greatly expands the application range of the torsional vibration exciter.
Drawings
Fig. 1 is a schematic structural view of a cam impact type alternating torque loading device according to the present invention.
Fig. 2 is a front view of the cam impact alternating torque loading device of the present invention.
Fig. 3 is a schematic view of an assembly of a first actuator motor and a first actuator cam according to the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
The cam impact alternating torque loading device comprises a rotating shaft 1, an excitation cylinder frame 2, an excitation force arm 3, a positive electrode ring 6, a negative electrode ring 10, a first actuating motor 4, a second actuating motor 5, a first actuating cam 11, a second actuating cam 12, 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 actuating motor 4 and a second actuating motor 5 are respectively fixed on the bottom surface of the exciting cylinder frame 2 and are close to the two ends of the exciting force arm 3, a first actuating cam 11 is arranged on the first actuating motor 4, and a second actuating cam 12 is arranged on the second rotating motor;
the positive electrode ring 6 and the negative electrode ring 10 are mounted on the outer cylinder wall fixed on the excitation cylinder frame 2, the positive electrode ring 6 and the negative electrode ring 10 are respectively connected with the first actuating motor 4 and the second actuating motor 5 through wires 9,
a positive brush 8 and a negative brush are fixed on the brush base 7, the positive brush 8 is in contact with the positive electrode ring 6, the negative brush is in contact with the negative electrode ring 10, the positive brush 8 and the negative brush are connected to a power source,
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, the first actuating motor 4, the second actuating motor 5, the first actuating cam 11 and the second actuating cam 12 are formed to be symmetrical with each other with the center of the exciting force arm 3 when being installed, so that torque is generated on 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 driven to rotate 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 actuating motor 4 and the second actuating motor 5 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 10, and when the torsional vibration exciter rotates, the positive electrode ring 6 and the negative electrode ring 10 always keep contact with the positive brush 8 and the negative brush, so that power and signals are provided for the first actuating motor 4 and the second actuating motor 5. When the first actuator motor 4 and the first actuator cam 11 are mounted, the first actuator motor 4 is required to rotate the first actuator cam 11, and the long-diameter stroke range of the first actuator cam 11 can effectively strike the excitation arm 3. The impact of the first actuating cam 11 and the second actuating cam 12 on the two ends of the exciting force arm 3 causes the exciting force arm 3 to vibrate, and further generates torque on the rotating shaft 1. The excitation frame is cylindrical, the positive electrode ring 6 and the negative electrode ring 10 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 cam impact type alternating torque loading device 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 actuating motor, a second actuating motor, a first actuating cam, a second actuating cam, 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 actuating motor and the second actuating motor are respectively fixed on the bottom surface of the exciting cylinder frame and are close to the two ends of the exciting force arm, the first actuating cam is arranged on the first actuating motor, and the second actuating cam is arranged on the second rotating motor;
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 actuating motor and the second actuating 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, the first actuating motor, the second actuating motor, the first actuating cam and the second actuating cam are formed to be centrosymmetric with the center of the excitation force arm when being installed, 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 |
|---|---|---|---|
| CN201710053570.0A CN106802237B (en) | 2017-01-20 | 2017-01-20 | Cam impact type alternating torque loading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710053570.0A CN106802237B (en) | 2017-01-20 | 2017-01-20 | Cam impact type alternating torque loading device |
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| Publication Number | Publication Date |
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| CN106802237A CN106802237A (en) | 2017-06-06 |
| CN106802237B true CN106802237B (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710053570.0A Active CN106802237B (en) | 2017-01-20 | 2017-01-20 | Cam impact type alternating torque loading device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109387997B (en) * | 2017-08-04 | 2021-03-26 | 北京空间机电研究所 | High-rigidity light space camera lens barrel and anti-vibration stability testing method thereof |
| CN111458240A (en) * | 2020-04-08 | 2020-07-28 | 上海蓝滨石化设备有限责任公司 | Rock torsional impact generation test device |
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