CN106877562A - A Torsional Vibration Loading Device Excited by Eccentric Motor - Google Patents

Abstract

A kind of torsional oscillation loading device excited by eccentric motor, the center of the exciting arm of force is fixedly connected with the center of circle of exciting tub bottom surface, first eccentric motor and the second eccentric motor are separately fixed at the two ends of the exciting arm of force, positive electricity polar ring and negative electricity polar ring are arranged on and are fixed on the outer tube wall of exciting tub, positive electricity polar ring and negative electricity polar ring are connected by wire with the first eccentric motor and the second eccentric motor respectively, positive brush and negative brush are all fixed on brush base, positive brush is contacted with positive electricity polar ring, negative brush is contacted with negative electricity polar ring, positive brush and negative brush are connected to power supply, rotating shaft one end is fixedly connected on the circle centre position of exciting tub bottom surface.Rotating shaft is rotated by power source, exciting tub is rotated together with rotating shaft, the periodicity tangential force that eccentric motor is produced causes cyclic torque in circle centre position, so that rotating shaft is subject to torsional excitation, realize that countershaft applies the function of torsional excitation, it is simple and compact for structure, to implement more to facilitate, performance is relatively 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 description

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 4, 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 4 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 to the first eccentric motor 4 and the second eccentric motor 4 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 4 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 4 pass through the excitation tube frame 2 through the wire 9 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 Eccentric motor 4 provides power and signal. The first eccentric motor 4 and the second eccentric motor 4 vibrate after they are connected to a power supply, which makes the exciting force arm 3 vibrate, thereby generating torque to the rotating shaft 1 . The excitation frame is cylindrical, the positive electrode ring 6 and the negative electrode ring 15 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 (3)

1. A torsional vibration loading device excited by an eccentric motor, characterized in that it comprises a rotating shaft, an exciting cylinder frame, an exciting force arm, a positive electrode ring, a negative electrode ring, the first eccentric motor, the second eccentric motor, a positive Brushes, negative brushes and brush bases; 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. 2. the torsional vibration loading device excited by the eccentric motor as claimed in claim 1, characterized in that, the first eccentric motor and the second eccentric motor respectively installed on the two ends of the exciting force arm to excite The center of the vibrating arm forms a central symmetry, thereby generating torque on the rotating shaft. 3. The torsional vibration loading device excited by an eccentric motor as claimed in claim 1, characterized in that, except for the connection between the center and the excitation tube support, the other two ends of the excitation force arm are in a suspended state .