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Computerized embroidery machine vibration test of the beam


Vibration beam experimental device beams bend of the first order natural frequency 23.894Hz, the first order beam natural frequency of vertical bending vibration 36.813Hz. To illustrate the problem more directly, the beam bending vibration natural frequency by the formula: 60 converted to beam vibration critical speed, the beam vibration level of experimental device beams bending vibration of the first order critical speed is 1433.64r/min; first-order vertical beam bending vibration critical speed for the 2208.78r/min. Calculations based on simple beam theory analysis shows that the change in the length and cross-section beam bending stiffness can effectively adjust the beam bending vibration, critical speed; change the way the fixed ends of beams, additional support beams at right angles after bending beam, the installation of beams rubber damper can effectively reduce the vibration amplitude of the beam. Table 1 shows the operating conditions single head embroidery machine vibration beam experimental device measuring point beam bending vibration 1,2,3 vertical and horizontal bending vibration at the measuring points 4,5,6 at different measures of the vibration damping displacement amplitude. Can be seen from Table 1: experimental equipment with increased speed, the displacement of each point upward trend, in line with the relevant beam vibration law, especially when the spindle speed is increased by the 1400r/min to 1450r/min, the level of beam bending vibration amplitude increases by a 1.372mm to 1.562mm, when the speed continues to rise, the vibration amplitude decreased,[link widoczny dla zalogowanych], so it can be concluded about beams generated in 1450r/min resonance, resulting in the bend of the first order vibration of beams amplitude increased. After the central beam angle support beams can significantly reduce the level of the central beam vibration displacement amplitude, when the spindle speed is 1450r/min support beams after the installation of the central rectangular beam bending vibration amplitude levels 0.2732Innl, far less than the same speed at both ends bolted beams bend of the beam vibration amplitude 1.562Innl, rectangular beam can be seen after the central support beam can be very effective way to reduce the vibration displacement amplitude of the central beam. Spindle speed of 1450r/min, the rubber cushion in both ends of the support beam mode, beam bending vibration amplitude of the central level 0.36771TI1TI,[link widoczny dla zalogowanych], far less than the beam bolted at both ends of the vibration amplitude 1.562Innl, see Rubber buffer mode support beam can be effectively reduced the level of bending vibration displacement amplitude; in the middle of installation of the horizontal beam of the rubber damper can effectively reduce the level of the central beam bending vibration displacement amplitude,[link widoczny dla zalogowanych], 1450r/min when the installation rubber damper beam bending vibration displacement amplitude 0.3508Bill,[link widoczny dla zalogowanych], less than the rubber damper is not installed at both ends of bolt displacement amplitudes of vibration 1.562Inn. Computerized embroidery machine vibration apparatus beam vertical beam bending vibration of the vibration analysis similar conclusions. 3 Conclusion 1) computer embroidery machine vibration beam experimental device beams bending vibration level of the first order critical speed is 1433.64r/min; beam bending vibration perpendicular to the first order critical speed is 2208.78r/min. No. 12 Jian-Long Lin et al: computerized embroidery machine vibration test of the beam 123 * Table 1 measuring point beam bending vibration of the vibration displacement of Tab. 1Vibrationdisplacementvalueofmeasurepointsoftheexperimentalequipmentofthecomputerizedembroiderymachine Note: The installation of rubber damper for supporting the middle way is the installation of rubber shock absorber in the beam,[link widoczny dla zalogowanych], still bolted to the beams at both ends. 2) fixed by changing the way both ends of the beam, supported by both ends of the rubber cushion, rectangular beam support beams after the middle of the center and installation of rubber shock absorber in the beam can effectively reduce the level of bending beams and vertical bending vibration displacement amplitude.
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