SU974801A1 - Vibration tamper - Google Patents

Abstract

VIBROTRAM, containing a housing with a drive located therein, having a shaft with a flywheel, kinematically connected with a gear wheel on which unbalance is fixed, and a crank-connecting rod mechanism, on the free end of the connecting rod of which a slider-drummer is mounted, characterized in that increase efficiency by increasing the impact energy, it is equipped with an additional unbalance attached to the flywheel with the axis shifting in the direction of rotation of the shaft of the crank-connecting rod mechanism relative to the axis of the crank by an angle of 15 90 In the upper position, the centers of mass of the unbalance are in line with the centers of rotation, and the gear ratio between their shafts is 1: 2. (L

Description

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ac The invention relates to the field of construction and can be used in the compaction of soils, blocking piles, or in the molding of products from concrete mixtures. Vibro-rammers with unbalance exciters with various centrifugal generation schemes of single-frequency forcing effects are known. The closest known one is a vibrotamper, comprising a housing with an actuator located therein, having a shaft with a flywheel, kinematically connected with a gear wheel on which unbalance is fixed, and a spiked-crank mechanism, on the free end of the connecting rod of which a slider drummer is mounted. . A disadvantage of the known rammers is that they do not both bake the optimum shock-vibration effect on the compacted soil or the immersed pile at various stages of compaction or reduction, which reduces the efficiency of the work. The purpose of the invention is to increase work efficiency by increasing the impact energy. This is achieved by the fact that the vibrating rammer, comprising a housing with a drive located in it, having a shaft with a flywheel, is kinematically connected with a gear wheel on which unbalance is fixed, and a crank-connecting rod mechanism, on the free end of the connecting rod of which the slider is mounted, is equipped with an additional balance fixed to the flywheel with the axis shifting in the direction of rotation of the shaft of the crank mechanism around the crank axis by an angle of 15 to 90, and in the extreme upper position the centers of mass of the unbalances are located on one l The lines are rotated with centers of rotation, and the gear ratio between their shafts is 1: 2. FIG. 1 shows a schematic diagram of a vibrotamper; in fig. 2 shows graphs of inertial forces versus various crank positions and unbalances. The tamper housing 1 contains a crank-and-rod drive drive of a percussion mechanism with an eccentric shaft 2 and a flywheel 3, on which is unbalanced 4 with a mass of t from the center of rotation to the center of this mass g such that its axis is offset from the axis of the crank 5 in the direction of rotation by an angle cf equal to 15-90. Crank 5 is connected to a connecting rod 6, at the free end of which a slider-hammer 7 is hinged and housed in guide 8. Guides for the body T (impact part) serve as racks 9 attached to the working plate 10 on which the anvil 11 is mounted. An additional centrifugal exciter is mounted in the housing (or on the housing), consisting of a shaft 12 with an additional flywheel 13 and an additional unbalance of 14 tons, having an offset of the center of mass relative to the axis of rotation by an amount T. Both shafts are kinematically connected with a gear ratio of 1: 2, which provides rotation of shaft 12 with angular speed 02, twice the angular velocity of rotation of CO, shaft 2. The axes of both unbalances are oriented so that when they pass through the vertical plane, their mass centers always located on the same line lying in this plane. Vibrating rammer works as follows. The torque is transmitted from the engine to shafts 2 and 12. The unbalances 4 and 14 are rotated, creating centrifugal forces P g. 11 and during such an impact on the impact part there will be a vertical pressure of inertia forces, which during the time of interaction of the striker with the limiter will retain a value close to the maximum. At the moments of interaction of the slider with the anvil limiter 11, all the active forces of the crankshaft-rod inertial oscillation exciter are summed up, which leads to both an increase in the force of impacts and an increase in the duration of the force action. Since most

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effective modes of operation are those in which the slider-impactor 7 collides with the anvil at the positions of the crank connected with it by an angle of 75 measured from the vertical in the direction of rotation, and the maximum value of the vertical inertial force of pressure can be obtained by moving the associated with the crank unbalance shaft at an angle of 90, it is appropriately figuratively O, taking into account the desired duration of the total force, assign an offset of the axis of this unbalance in the direction of rotation relative to the crank axis at an angle of 15 9 °

The application of this invention allows to increase the productivity of the vibrotamper by up to 15% with a simultaneous increase in the depth and degree of compaction of various materials.

Claims (1)

VIBRATOR, comprising a housing with a drive located in it, having a shaft with a flywheel, kinematically connected to the gear, on which the unbalance is fixed, and a crank mechanism, on the free end of the connecting rod of which a slider-drummer is mounted, characterized in that, in order to increase efficiency work by increasing the energy of the impact, it is equipped with an additional unbalance fixed to the flywheel with an axis offset in the direction of rotation of the shaft of the crank mechanism relative to the axis of the crank at an angle of 15 90, and upper position prices try mass unbalances are aligned with the centers of rotation, and the gear ratio between their shafts is 1: 2. ς © H 1 - 974801 2