SU1144765A1 - Eccentric knock-out grid - Google Patents

Abstract

An ECCENTRIC BANDING LATTICE, containing a top frame with a canvas, a bottom frame with a drive and shock absorbers, installed by means of spring vibration isolators on a building structure, characterized in that, in order to reduce metal intensity and reduce the dynamic effect on building structures, it is equipped with an intermediate frame, installed between the lower frame and the building construction on vibration isolation.

Description

, 1 The invention relates to a foundry and can be applied when embossing molds. A known eccentric embossing grille containing movable web is installed by means of vibration insulators on the support frame lj. However, the known device is characterized by the fact that during operation there are large dynamic forces acting on the base. Closest to the proposed technical supersity and the achieved result is an eccentric embossing lattice containing an upper frame with a canvas, a lower frame with a drive and shock absorbers installed by means of a vibration insulator on a building structure. For efficient operation, the embossing lattice should have the following kinematic parameters: Q (O, 7–0.9) e CO is the amplitude of the absolute acceleration of the lattice providing the necessary impact energy: M 10 t is the mass of the knock-out lattice with the chamber; And 750 - 1500 rpm, the speed of the eccentric shaft; WITH 78.5 rad / s is the circular frequency of forced vibrations of the knock-out grating; P (0.3–0.5) SZrad / s is the circular natural frequency of the system in accordance with the vibration insulation conditions; Z - crankshaft eccentricity. Under these conditions, the mass of the lower movable frame is equal to M (29.7 tons. The disadvantages of the known lattice are the considerable mass of the system as well as the large dynamic loads on the building construction structures. The purpose of the invention is to reduce the metal capacity and decrease the dynamic effect on the building structures. 1 The goal is achieved by the fact that the eccentric embossing grille is contained in the upper frame with the blade, the lower frame with the drive of shock absorbers, installed by means of spring vibration isolators on the building structure and equipped with an intermediate frame installed between the lower frame and the building structure on vibration isolators In Fig. 1 an eccentric embossing grill is shown, general view; Fig. 2 is view A in Fig. 1.5.5 The eccentric embossment grill contains an upper movable frame 1 with the grid plate, bearing supports 2, which are mounted on the lower frame 3, which by means of vibration insulators 4 rests on the intermediate frame 5. Intermediate frame 5 through vibration isolators 6 is installed on the structure 7 of the building. The actuator 8 is installed on the lower frame 3, on which the upper movable frame 1 is mounted on rubber vibration isolators 9. The masses of frames and spring stiffness of vibration isolators are determined from the conditions: P 1+ (He) AA M, M2 imc.xW-lCt V) where P is its own circular oscillation frequency; M, mass of the lower frame; intermediate frame weight; M - mass knockout frame with support; circular frequency of forced vibrations of the knock-out grating; vibration isolation coefficient; mci “maximum drawdown of vibration-isolating springs; acceleration of gravity. The blade frame with a movable frame 1 vibrates under the action of an eccentric shaft with bearings support 2, rotated by a drive 8 with the engine. The progressive nature of the movement of the lattice is ensured by the fact that the knee of the shaft passes through its center of mass. Possible angular deviations of the hull due to off-center shocks of the flask compensate for rubber vibration isolators 9. Dynamic loads arising from the vibratory movement of the upper movable frame 1 with the grille web and the flask are transferred to building structures 7 through rubber vibration isolators 9, bearing supports 2, the lower frame 3 , spring vibration isolators 4, intermediate frame 3 and spring vibration isolators 6. Under the dynamic influence of the lower frame 3 and the intermediate frame 5 makes oscillatory movements. To increase the effectiveness of this system should be reduced.

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partial frequencies of the lower frame 3 vibration isolators D and intermediate frame 3 on vibration isolators 6, reducing the rigidity of vibration isolators, or increasing the mass of the frames.

The cascade system completely damps the oscillations of the lower frame 3 at a given frequency of action. This makes it possible to withstand the amplitudes of oscillations of the knock-out grating required by technical 1447654

To the ecological regime, and at the same time, the intermediate frame 5 to the building structures 7 transmits an effort that does not exceed the allowable height of 5 faces.

The effect of the use of the proposed device in comparison with the prototype is expressed in a decrease in metal consumption by 17 tons per 10 knockout grid:

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Claims (1)

EXCENTRIC PUNCHING GRILLE, comprising an upper frame with a blade, a lower frame with a drive and shock absorbers installed by means of spring vibration isolators on the building structure of the building, characterized in that, in order to reduce the metal consumption and reduce the dynamic effect on the building structure, it is equipped with an intermediate frame installed between the lower frame and the building structure on vibration isolators