UA14707U - Vibration exciter of fluctuations - Google Patents

Abstract

The vibration exciter of fluctuations contains drive shaft, antifriction bearings and unbalances. Vibration exciter is executed in the form of a central hollow axle rigidly fixed on the flanged support, at the ends of said axle are installed on the antifriction bearings two unbalance rotors, exist equidistant from the bearing surface of the flanged support. Each unbalanced rotor is performed in the form of a carrying holder closed from two sides by end covers, at outside diameter of which are fixed the unbalances. External end covers are established with a clearance relative to the ends of the axle and it is rigidly fixed both on the rotors and on the drive shaft mounted inside hollow axle with a clearance.

Description

Description of the invention

The utility model belongs to vibration equipment, namely to devices for exciting oscillations of large 2 power in vibration machines used in the industry of building materials for the formation of precast concrete and reinforced concrete products, as well as in mining and other industries.

A well-known vibration exciter containing a housing and a drive shaft mounted inside it with the help of bearings in spaced supports, on which an imbalance is fixed in the center between the supports (Patent 70 of the Russian Federation 2200635, Cl. VO6В1/16, 20011.

The disadvantage of the known device is a large metal capacity, significant dimensions and a relatively small power of vibration, which does not allow the use of the known device in vibrating platforms with horizontal excitation of vibrations, intended for the formation of long-dimensional and large-sized concrete products.

The closest to the proposed useful model is a vibration exciter containing a housing and mounted 712 Inside it, on bearings, a drive shaft at the ends of which unbalances are fixed at the outgoing ends of the housing (Author's certificate of the USSR 1583180, Cl. VO6ЕВ1/16, 19881.

The known device has a large metal capacity and is unable to develop large disturbing forces, especially during an increase in the frequency of forced oscillations. Therefore, the well-known vibration exciter can be used only on low-capacity vibrating platforms. When increasing the carrying capacity, it is necessary to install several such vibration exciters, which greatly complicates the design of the vibrating machine and often does not allow obtaining the necessary law of its oscillations. Also, the end mount used on this vibration exciter is not reliable enough due to the fact that in the process of transmitting the disturbance from the vibration exciter to the vibration machine, the main load is taken by the threaded mount, which weakens under the influence of vibration and quickly fails.

The task of the intended useful model is to reduce the metal capacity and increase the vibration power. 29 This technical result is achieved by the fact that the vibration exciter, which contains the drive shaft, rolling bearings and imbalances, is made in the form of a central hollow axis rigidly fixed on a flange support, on the protruding ends of which two unbalanced rotors, equidistant from the support, are mounted on rolling bearings surface of the flange support, while each unbalanced rotor is made in the form of a bearing bracket closed on both sides by end caps, on the outer diameter of which unbalances are fixed, and the outer end caps are installed with a gap relative to the ends of the axis and are rigidly fixed both on av rotors and on to the drive shaft, which is installed inside the hollow axis with a gap. Each rotor is provided with the main and additional imbalances, and the main imbalance is fixed, and the additional imbalances are removable. Additional imbalances have a round shape and are symmetrically fixed with /-«f fingers on the main imbalance. 325 Fig. 1 shows a vibration exciter, general view; - in Fig. 2 - section A - A in Fig. 1.

The vibration exciter is made in the form of a central hollow axis 2 rigidly attached to the flange support 1, on the protruding ends of which two unbalanced rotors 4 are mounted on rolling bearings C, equidistant from the supporting surface of the flange support 1, while each unbalanced rotor is made in the form of a closed with two sides with end caps 5 and b of the bearing bracket 7, on the outer diameter of which c are fixed imbalances 8 and 9, and the outer end caps 6 are installed with a gap relative to the ends of the axis 2 and

Iz" are rigidly fixed both on the rotors and on the drive shaft 10, which is installed inside the hollow axis with a gap. Each rotor is equipped with the main 8 and additional 9 imbalances. Additional imbalances 9 are removable. They have a round shape and are symmetrically fixed with the help of fingers 11 on the main imbalance.

The main unbalances are mounted on the bearing brackets 7 using keyed connections 12. Cuffs 13 are installed in the inner end caps 5. Cotter joints 14 are used to keep the fingers from shifting in the axial direction "" . A V-belt pulley 15 is installed on the drive shaft 10 transmission, by means of which the vibration exciter is connected to the electric motor (not shown in the drawing). 7 The vibration exciter works as follows. aw! 20 During the rotation of the drive shaft 10, the movement through the external end caps 6 is transmitted to the unbalanced. rotors 4. At the same time, the rotors generate a disturbing force, the amplitude of which is equal to: z O-stot, where t is the mass of imbalances, kg; oyu - angular speed of rotation of unbalanced rotors, rad/s; r - eccentricity, that is, the distance from the axis of rotation to the center of gravity of imbalances, m.

Due to the large eccentricity caused by the proposed design, the mass of imbalances is significantly reduced.

The amplitude of the disturbing force is adjusted by changing the mass of the removable imbalances 9. The attachment of the removable imbalances 9 to the main imbalances 8 with the help of fingers 11 significantly increases the amount of eccentricity and at the same time simplifies the design of the rotors. Because the installation of unbalanced rotors at the same distance from the support surface of the flange support allows to eliminate the occurrence of angular vibration actions in the vertical plane on the attachment of the vibration exciter.

The use of the proposed vibration exciter makes it possible to increase the amplitude of the disturbing force by 1.8 times, simultaneously reducing the mass of the vibration exciter by 1.3 times, which will significantly simplify the design and reduce the weight of the vibrating machine, for example, a high-capacity vibrating platform intended for 65 forming concrete and reinforced concrete products.

Claims (3)

Formula of the invention 5. . . - . I. 1. Vibration exciter containing a drive shaft, rolling bearings and imbalances, which is distinguished by the fact that it is made in the form of a central hollow axis rigidly fixed on a flange support, on the protruding ends of which two imbalance rotors are mounted on rolling bearings, equidistant from the support surface of the flange support , while each unbalanced rotor is made in the form of a bearing bracket closed on both sides by end caps, on the outer diameter of which imbalances are fixed, and the outer end caps are installed with a gap relative to the ends of the axis and rigidly fixed both on the rotors and on the drive shaft, which is installed inside a hollow axle with clearance. 2. Vibration exciter according to claim 1, which differs in that each rotor is provided with main and additional imbalances, and the main imbalance is fixed, and the additional imbalances are removable. 3. Vibration exciter according to claim 2, which is characterized by the fact that the additional imbalances have a round shape and are symmetrically fixed with the help of fingers on the main imbalance. that 2 in "c) in " e - and? - sh" -i ("c) that 60 b5