CN106877562B - A Torsional Vibration Loading Device Excited by Eccentric Motor - Google Patents

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

A Torsional Vibration Loading Device Excited by Eccentric Motor

technical field

The invention relates to the mechanical field, in particular to a torsional vibration loading device excited by an eccentric motor.

Background technique

Eccentric motors have strong shock resistance and are widely used in various excitation occasions. In many engineering occasions, torsional vibration excitation is used to load rotating shaft parts, such as engine crankshafts, turbo generators, and ship shafting. Fatigue test, torsional vibration test, modal analysis and vibration response analysis to understand the performance of these shafting parts, simulate their dynamic performance under certain working conditions, and obtain relevant test data. The dynamic stress generated by the bending-torsion coupling resonance is used to eliminate the residual stress of the shaft parts. In the implementation process, the torsional vibration excitation needs to be applied to the shaft. When the motor rotation frequency is equal to the difference between the bending natural frequency and the torsional natural frequency, the applied torsional vibration The excitation is equal to the torsional natural frequency. According to the bending-torsion coupling theory, the eccentric shaft will simultaneously excite the bending resonance, and the bending resonance and torsional resonance will strengthen each other to generate sufficient dynamic stress. The torsional vibration exciters currently used include electromagnetic exciters, pneumatic exciters, and hydraulic exciters. However, these exciters have complex structures, low reliability, high prices, high maintenance costs, difficult implementation, and difficult to popularize. .

Contents of the invention

The object of the present invention is to provide a torsional vibration loading device excited by eccentric motors, which is rigidly connected to the excitation frame through the rotating shaft, the vibration arm is rigidly connected to the frame, and the two eccentric motors are respectively fixedly connected to the end of the excitation arm , which are respectively centered on the center of the force arm, and installed symmetrically on both sides. The rotating shaft is driven by the power source to rotate, and the exciting force arm and the frame rotate together with the rotating shaft due to their rigid connection with the rotating shaft. The periodic tangential force generated by the eccentric motor causes a periodic torque at the center of the circle, which makes the shaft excited by torsional vibration.

The present invention achieves the above object through the following technical solutions:

A torsional vibration loading device excited by an eccentric motor, comprising a rotating shaft, an exciting cylinder frame, an exciting 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 brush base;

The center of the exciting force arm is fixedly connected with the center of the bottom surface of the exciting cylinder frame, and the first eccentric motor and the second eccentric motor are respectively fixed at both ends of the exciting force arm,

The positive electrode ring and the negative electrode ring are installed on the wall of the outer cylinder fixed on the excitation cylinder frame, and the positive electrode ring and the negative electrode ring are respectively connected to the first eccentric motor and the second eccentric motor through wires,

Both the positive brush and the negative brush are fixed on the brush base, the positive brush is in contact with the positive electrode ring, the negative brush is in contact with the negative electrode ring, the positive brush and the negative brush are connected to the power supply,

One end of the rotating shaft is fixedly connected to the center of the circle on the bottom surface of the vibration cylinder frame.

The exciting force arm and the first eccentric motor and the second eccentric motor respectively installed at both ends of the exciting force arm form a center symmetry with the center of the exciting force arm, thereby generating torque to the rotating shaft.

Except for the connection between the center and the vibration cylinder holder, the other two ends of the excitation force arm are in a suspended state.

The outstanding advantages of the present invention are:

Most of the exciters described in this design are composed of mechanical parts, with high reliability, simple and compact structure, convenient and simple installation, high strength parts, and can adapt to a larger excitation range, and the excitation force arm is adjustable, eccentric Motor arrangement and position can be adjusted. Compared with electromagnetic torsional vibration motors, hydraulic and pneumatic torsional vibration exciters, and eccentric motors, the torsional vibration generation method and principle are simpler, more convenient to implement, and more reliable in work performance, which reduces production and commissioning costs and improves In order to improve economic benefits, the excitation force generated by the eccentric motor is adjusted by the eccentric mass, eccentric distance and eccentric motor speed. The eccentric block is easy to replace and adjust, and can be adjusted according to the actual conditions of the test parts. It has strong flexibility and wide adaptability. , Within the rated speed range, stepless speed regulation can be realized, the cost is low, and the maintenance is easy, which greatly expands the application range of the torsional vibration exciter.

Description of drawings

Fig. 1 is a schematic structural diagram of the torsional vibration exciter excited by an eccentric motor according to the present invention.

Fig. 2 is a front view of the torsional vibration exciter excited by an eccentric motor according to the present invention.

Fig. 3 is a right side view of the torsional vibration exciter excited by an eccentric motor according to the present invention.

FIG. 4 is an enlarged schematic view of position A in FIG. 3 .

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A torsional vibration loading device excited by an eccentric motor, comprising a rotating shaft 1, an exciting cylinder frame 2, an exciting force arm 3, a positive electrode ring 6, a negative electrode ring 5, a first eccentric motor 4, a second eccentric motor 10, Positive electric brush 8, negative electric brush and electric brush base 7;

The center of the exciting force arm 3 is fixedly connected to the center of the circle of the bottom surface of the exciting cylinder frame 2, and the first eccentric motor 4 and the second eccentric motor 10 are respectively fixed at both ends of the exciting force arm 3,

The positive electrode ring 6 and the negative electrode ring 5 are installed on the outer cylinder wall fixed on the excitation cylinder frame 2, and 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 wires 9 ,

Both the positive brush 8 and the 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 5, the positive brush 8 and the negative brush are connected to the power supply,

One end of the rotating shaft 1 is fixedly connected to the center of the circle of the bottom surface of the excitation cylinder frame 2 .

Further, the excitation force arm 3 and the first eccentric motor 4 and the second eccentric motor 10 respectively installed at both ends of the excitation force arm 3 form a center symmetry with the center of the excitation force arm 3, thereby generating torque to the rotating shaft 1 .

Further, except for the connection between the center and the excitation cylinder frame 2, the other two ends of the excitation force arm 3 are in a suspended state.

When working, the rotating shaft 1 is driven by the power source to rotate, the motor drives the rotating shaft 1 to rotate, and the rotating shaft 1 drives the torsional vibration exciter to rotate, and the power lines of the first eccentric motor 4 and the second eccentric motor 10 pass through the wire 9 on the excitation cylinder frame 2 The hole in the hole is connected with the positive electrode ring 6 and the negative electrode ring 5. When the rotating shaft 1 rotates, the positive electrode ring 6 and the negative electrode ring 5 always keep in contact with the positive brush 8 and the negative brush, thereby giving the first eccentric motor 4, the second The eccentric motor 10 provides power and signals. The first eccentric motor 4 and the second eccentric motor 10 vibrate after they are connected to a power supply, which causes the vibration arm 3 to vibrate, thereby generating torque to the rotating shaft 1 . The excitation frame is cylindrical, the positive electrode ring 6 and the negative electrode ring 5 are coaxially installed on the outer wall surface of the cylindrical excitation frame, and one end of the cylindrical vibration excitation frame is provided with a bottom surface or Both ends are provided with bottom surfaces.

The torsional vibration output by the torsional vibration exciter is applied to the high-stiffness rotating shaft 1. When the rotational frequency of the shaft 1 is equal to the difference between the bending natural frequency and the torsional natural frequency , according to the bending-torsion coupling resonance theory, a frequency equals torsion The torsional vibration excitation of the natural frequency can excite the bending resonance at the same time, and the bending resonance and the torsional resonance reinforce each other to generate enough dynamic stress to eliminate the residual stress of the high-stiffness 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.

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