RU180102U1 - PLANETARY VIBRATOR WITH CONTROLLED CHARACTERISTICS AND CHAIN TRANSMISSION - Google Patents

Abstract

The utility model relates to technical means of exciting mechanical vibrations used in construction for cyclic dynamic effects of various types. Vibration, as a special case of the result of cyclic dynamic effects, is widely used in various fields of technology. In this case, the problem of transferring mechanical energy from an oscillation source to an object of influence is solved in the most efficient way for a qualitative change in its structure. The main way to excite mechanical vibrations is the rotational motion of unbalanced systems around axes that do not coincide with their centers of mass. The technical result of the utility model is to expand the spectrum of types of periodic dynamic actions excited by the same device, which can vary in amplitude, directional action and type of time dependence more complex than harmonic without the need for gears requiring high precision manufacturing. The specified technical result is achieved by the fact that the design of the device includes a pair of asterisks with eccentric masses on a carrier mounted on an axis with the possibility of changing their position relative to it and a fixed additional sprocket with the possibility of communicating rotational movement to the runners using a chain transmission.

Description

The utility model relates to technical means of excitation of mechanical vibrations used in construction for cyclic dynamic effects of various types.

Vibration, as a special case of the result of cyclic dynamic action, is widely used in various fields of technology. In this case, the problem of transferring mechanical energy from an oscillation source to an object of influence is solved in the most efficient way for a qualitative change in its structure. The main way to excite mechanical vibrations is the rotational motion of unbalanced systems around axes that do not coincide with their centers of mass.

There are various types of unbalanced systems used in vibration exciters, among which planetary vibration exciters occupy a special place, as they allow one to obtain more complex types of dependence of the force of influence on time than purely harmonic.

Of the known technical solutions, the closest in technical essence is a device for its implementation of a method for producing directional mechanical vibrations (RF patent No. 2381078, IPC В06В 1/00), comprising a housing with a ring gear (supporting central wheel of internal gearing), carrier and satellite with fixed on it with an inertial element, as well as rollers and treadmills in mutual contact, the diameters of which are equal to the diameters of the pitch circles, respectively, of the satellite and the crown eternity.

The disadvantages of the prototype are the inability to control the magnitude of the excited force in other ways, except for changing the frequency of the rotational movement of the slider and changing the position of the center of mass of the inertial element, as well as the inability to obtain more complex forms of the dependence of force on time than the families of the hypocycloid indicated in the description. In addition, the use of gears in its design requires high manufacturing accuracy and increases the requirements for the materials used and the choice of operating modes. It should be noted that the excited force of the device selected as a prototype in the description of the utility model is calculated without taking into account the influence of rotation of the eccentric mass of the carrier, which is why its actual appearance differs from the declared one.

The technical result of the utility model is to expand the range of types of periodic dynamic actions excited by the same device, which can vary in amplitude, directional action and type of time dependence, more complex than harmonic without the need for gears requiring high manufacturing accuracy. The indicated technical result is achieved in that the device design includes a pair of asterisks with eccentric masses on a carrier mounted on an axis with the possibility of changing its position relative to it, and an additionally fixed asterisk with the ability to communicate rotational movement to the runners using a chain transmission.

The vibration exciter (Fig. 1, 2) consists of a carrier 1 mounted rotatably around axis 2, the position of which relative to the center of the carrier can be adjusted using the mounting unit 3.

At the ends of the carrier 1, satellite runners 5 and 6 equipped with eccentric masses 4 are mounted with the possibility of rotation around the axes 7 and 8. The runners are connected to each other by a chain gear 9, which makes a rigid kinematic connection, through a fixed sprocket 10.

When the carrier 1 rotates around axis 2, the runners 5 and 6 at its ends additionally rotate around the axes 7 and 8. The carrier rotates through the gear 9 via a fixed sprocket 10. The runners rotate at angular speeds determined by the position of axis 1 in relation to the center of the carrier, adjustable by means of the mounting unit 3, and the angular velocity of rotation of the carrier.

The position of the centers of the eccentric masses of the runners determines the directional nature of the centrifugal inertia force

accordingly, its vertical component applied to the axis can be defined as the projection onto the y axis

Where

- масса водила (сосредоточенная в его центре масс);

- the mass of the carrier (concentrated in its center of mass);

- полное ускорение центра масс водила;

- complete acceleration of the center of mass of the carrier;

- единичный вектор радиус-вектора центра масс водила;

- the unit vector of the radius vector of the center of mass of the carrier;

- масса бегунка (сосредоточенная в его центре масс);

- mass of the runner (concentrated in its center of mass);

- полное ускорение центра масс бегунка;

- full acceleration of the center of mass of the slider;

- единичный вектор радиус-вектора центра масс бегунка;

is the unit vector of the radius vector of the center of mass of the slider;

- единичный вектор направления оси y.

is the unit vector of the y axis direction.

- единичного вектора направления оси y в качестве вектора, определяющего направление воздействия вибровозбудителя, может быть выбран произвольный вектор.Instead

- a unit vector of the direction of the y axis as an vector defining the direction of action of the vibration exciter, an arbitrary vector can be selected.

Given that the radius vector of the center of mass of carrier 1 and the positions of the centers of mass of the runners can be adjusted, the modulus of the force acting on the axis can vary widely. Regulation of the type of dependence of the dynamic force on time can be carried out by appropriate selection of the initial position (phase) of the movement of carriers and runners.

центра масс водила радиуса R_вод при вращательном движении с угловой частотой со меняется по законуRadius vector

of the center of mass of a carrier of radius R of _waters in a rotational motion with an angular frequency ω varies according to the law

moreover, R _water represents the distance from the center of mass of the carrier to axis 2.

In turn, each of the runners will make a more complex movement, and the radius vector of the center of the eccentric mass of the runner will change according to the law

where R is the length of the carrier from the axis of the exciter to the axis of the runner 5;

ϕ _water - the initial phase (position) of the carrier;

R _run - the distance from the center of mass of the runner to the axis of the runner;

ϕ _run - the initial phase of the runner relative to the axis;

, где n₁ и n₂ - числа зубцов на звездочках цепной передачи бегунков.ω _run - the angular speed of rotation of the runner around its axis, determined by the formula

where n ₁ and n ₂ - the number of teeth on the chain sprockets of the runners.

Thus, the mass positions of the runners, the carrier and their initial phases (positions) can provide, for a fixed distance from the center of the carrier to its axis of rotation 1, any of the configurations intermediate between those shown in FIG. 3, 4. This controls the direction of the maximum dynamic effect and the magnitude of the force generated by the pathogen.

Claims (1)

Vibration exciter with two satellite runners with unbalances on the carrier, characterized in that the satellite runners are made in the form of chain transmission sprockets with the ability to transmit the carrier rotation of the carrier around its axis using a chain by means of a fixed additional sprocket, as well as the presence of a device for adjusting the position of the carrier center relative to the axis of its rotation.

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