RU1810125C - Planetary vibration exciter - Google Patents

Abstract

Usage: in vibration technology. SUBSTANCE: planetary vibration exciter comprises a treadmill (1) with an inertial runner (2), which is connected by an articulated lever (4) to a carrier (7), which is eccentric relative to the center of curvature of the treadmill. The lever (4) at the other end is connected to the pin (5) mounted inside the radial groove (6) of the carrier (7). 3 ill.

Description

FIG.

The invention relates to planetary vibration exciters.

The aim of the invention is to increase efficiency by introducing additional freedom into the mechanism for transferring the 6t motion to the inertial slider.

To do this, the hinge connected to the slider with a lever at the other end is connected to a pin mounted inside the carrier’s radial groove.

A known construction of a planetary vibration exciter comprising a treadmill with a concentrically arranged carrier that is pivotally connected to the axis of the inertial runner and additionally connected to this runner by a lever pivotally mounted with an eccentricity on the carrier and connected by means of a crochet hook to the runner. However, in the known construction, the lever serves to secure the unbalanced load at its free end, and the rocker joint serves to set the law of variation of the slider’s moment of inertia as a function of the angle of rotation of the carrier, whereas in the proposed device, the rocker connection drove to the lever, which is connected with the inertial slider, serves to set a new law of motion of the inertial slider, providing an increase in driving force, i.e. increasing the efficiency of vibration exciters. In addition, in the known design, the rocker joint provides additional carrier torsional vibrations, and in the proposed device, on the contrary, the use of the rocker joint reduces the tangential and completely eliminates the radial dynamic forces transmitted to the carrier from the inertial runner, which reduces the carrier torsional and bending vibrations, considered in this case as a negative factor. Thus, the proposed device is characterized by a new set of features in comparison with the known construction, providing i a fundamentally new positive effect.

In FIG. 1-2, a planetary vibration exciter is shown schematically at various angular positions of a carrier and an inertial slider; in FIG. 3 is a radial section through a vibration exciter along line AA in FIG. 2

The planetary vibration exciter contains a treadmill 1 with a radius R, on which an inertial runner 2 is mounted. The axis 3 of the runner 2 is pivotally connected to a lever 4, which is provided at the other end with a finger 5 mounted inside for

the leading groove 6 of the carrier 7. The carrier 7 is eccentric with respect to the center of curvature 0 of the treadmill 1, connected by a shaft 8 with a drive motor (not shown) and provided with a counterweight 9 diametrically opposite to the finger 5. The radial groove 6 of the carrier 7 forms a rocker with finger 5 a connection providing an additional degree of freedom in the direction radial relative to the carrier to the mechanism for transmitting motion from the carrier to the inertial slider 2.

The operation of the planetary vibration exciter is carried out as follows.

5 When the carrier 7 rotates, the runner 2 makes a planetary motion with a variable radius on the surface of the treadmill 1, during which the centrifugal force Pc and the Coriolis force Pk act on the slider 2. With an increase in the radius of motion of the runner 2, the Coriolis force Pk acts in the opposite direction of motion, and with a decrease in the specified radius in the direction of motion of the slider 2. The geometric sum of the forces Pc and Pj determines the resulting force P, the projection of which onto the radius of curvature of the base track, in turn, determines the normal force Pk, which is the driving force of the vibration exciter;

When the inertial slider 2 is located at the upper point with a minimum radius relative to the axis of rotation of carrier 7 (see Fig. 1}, the centrifugal force Pc is minimal, the Coriolis force starts to increase from zero. The slider 2 is delayed in its angular displacement compared to the angular velocity drove 7, and finger 5 moves under the action of forces of resistance to the movement of the runner 2 along the groove 6 towards the axis of rotation of the carrier 7. Accordingly, the angular velocity of the runner 2 is minimal, as well as the resulting force

5

0

5

0

5

0

.4(; ,

where t is the mass of the inertial slider 2;

(o is the angular velocity of the slider;

R is the radius of the slider;

p is the current angle of rotation of carrier 7 relative to the vertical position.

With a further turn of carrier 7, the angular velocity and radius of movement of slider 2 sharply increase. The finger 5 moves along the groove towards the treadmill 1. and the slider 2 catches the carrier 7 in the angular movement. In the lower vertical position, the radius of the runner 2 tends to its maximum, the Coriolis force Px reverses, passes through the zero value, and the angular speed of the runner drops. As the carrier 7 rotates further, finger 5 moves along groove b toward the axis of rotation of carrier 7, and the radius of movement of slider 2 decreases. The runner begins to lag behind in angular movement from the carrier 7, respectively, its angular velocity decreases. Despite the significant Coriolis force Pk, which is associated with a sharp decrease in the radius of motion of the runner 2, the centrifugal force Pch and the resulting force P decrease due to a decrease in the angular velocity, income to the minimum when the runner 2 approaches its upper position, when its radius changes as a function of the angle of rotation of carrier 7 slightly and the Coriolis force Pk drops sharply. Thus, the resultant force P and the normal force f are asymmetric with respect to the vertical axis and as a function of the angle of rotation of carrier 7.

e The advantage of the proposed vibration exciter is to increase the driving force and efficiency of the vibration exciter with its mass and dimensions unchanged, due to a coordinated change in the radius and angular velocity of the inertial runner, and the rocker connection of the lever with the carrier provides an increase in the effect of differentiated changes in the angular velocity of the runner and eliminates the probability of violating the law of this movement in almost the entire range of ratios of the lengths of the lever and the carrier, eccentricity during yl, and the radius of the treadmill.

Claims (1)

Formula of the invention A planetary vibration exciter comprising a body with a treadmill, a runner interacting with it, a lever pivotally connected to it by a first end and pivotally connected to a second end of a lever, mounted offset from the center of curvature of the treadmill, characterized in that, in order to increase efficiency , it is equipped with fingers fixed on the second end of the lever and interacting with a groove made in the carrier along its axis. Figure 1 Fig a