Horizontal unidirectional vibration table with adjustable amplitude and frequency

Abstract

The invention discloses a horizontal unidirectional vibration table with adjustable amplitude and frequency, which relates to the technical field of vibration test equipment. The vibration table comprises a bracket, a vibration table board and a driving mechanism, wherein the vibration table board and a test piece fixed to the table board are driven by means of the driving mechanism to vibrate horizontally on the bracket in a reciprocating mode; the driving mechanism comprises a variable frequency motor capable of adjusting a rotating speed to control the vibration frequency, a reduction gearbox and an eccentric adjusting mechanism for controlling the amplitude; the eccentric adjusting mechanism comprises a Pi-shaped sliding groove fixed to the lower portion of the table board, a U-shapedsliding groove connected with an output shaft of the reduction gearbox and an eccentric shaft; the eccentric shaft comprises an eccentric shaft sliding block and an eccentric shaft pin arranged aboveone end of the eccentric shaft sliding block; the eccentric shaft sliding block can slide and be locked in the U-shaped sliding groove so as to adjust an eccentric distance of the eccentric shaft pin;the eccentric shaft pin is inserted into the Pi-shaped sliding groove; and the eccentric shaft pin does circular motion in the horizontal plane and drives the Pi-shaped sliding groove and the vibration table board to vibrate horizontally in a reciprocating mode in the rotating process of the eccentric shaft.

Description

technical field [0001] The invention relates to the technical field of vibration test equipment, in particular to a vibration table used in a horizontal unidirectional vibration test with adjustable amplitude and frequency. Background technique [0002] Vibration tables are often used as test equipment for dynamic tests in the field of mechanical and civil engineering. At present, there are two types of relatively mature test vibration tables on the market: electromagnetic type and hydraulic type. The electromagnetic vibrating table uses the electromagnetic force generated by the energized coil in the magnetic field to excite the vibration. Its advantages are: the equipment is small in size and easy to control; the disadvantages are: the mass of the test piece is small and the vibration frequency is high. Therefore, the electromagnetic vibration table is generally more suitable for high-frequency vibration tests of small specimens. The hydraulic vibration table adopts a hy...

AI Technical Summary

Problems solved by technology

The electromagnetic vibrating table uses the electromagnetic force generated by the energized coil in the magnetic field to excite the vibration. Its advantages are: the equipment is small in size and easy to control; the disadvantages are: the mass of the test piece is small and the vibration frequency is high.

The hydraulic vibration table adopts a hydraulic actuator for excitation, and its advantages are: the mass of the test specimen is large, there are many vibration modes, and it is easy to control; the disadvantages are: complex equipment, large volume, and low vibration frequency

The mass and vibration frequency of the mechanical shaking table test are between the electromagnetic shaking table and the hydraulic shaking table, and it has a wide range of applications. The control of vibration is not as convenient and precise as electromagnetic and hydraulic

The disadvantages of the vibrating table disclosed in this patent are: 1) the amplitude and frequency of the vibrating table are fixed values ​​and cannot be adjusted; 2) the crank linkage mechanism is used to convert the motor rotation into the reciprocating motion of the table, and the driving mechanism is complex and reliable. Poor performance, low driving efficiency

The shortcomings of the vibrating table disclosed in this patent are: 1) the core components of the vibrating table, the specific structure of the eccentric adjustment device and the specific implementation method of the amplitude adjustment are not described in the application, and the amplitude adjustment function is difficult to realize; 2) the motor passes through the reduction box , belt, and rotating spindle to transmit power, the force transmission mechanism is complicated, poor in reliability, and low in efficiency; 3) Although the application states that the vibration frequency is adjusted by adjusting the speed of the frequency conversion motor, it does not explain how to select the key parameter of motor power. It is difficult to realize this invention in actual operation; 4) If the quality of the vibrating table is not large enough, the test cannot be carried out due to the strong natural vibration of the vibrating table due to the table vibration. Relationship

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