SU1486253A1 - Arrangement for vibroinsulation of vertical forging hammer - Google Patents

Description

The invention relates to the field of engineering, namely to the structures of the Foundation

blacksmithing equipment. The purpose of the invention is to increase reliability. The device for vibration isolation of a vertical forging hammer includes spring vibration isolators placed between shaft 3 and foundation 1, as well as vibration dampers installed between the side walls of the shaft and foundation. Each vibration damper is a single-acting power cylinder mounted at an angle to the vertical axis of the hammer, equal to the angle of friction of the friction pair of parts 6 and 7. When struck, vibration absorbers perceive the work load. The return movement of the work is extinguished by side vibration dampers. 4 il.

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1486253

The invention relates to the field of engineering, namely, to the design of the foundation of forging equipment.

The purpose of the invention is to increase reliability by reducing dynamic loads.

FIG. 1 shows a diagram of the vibration isolation of a forging hammer; in fig. 2 - vibration damper; in fig. 3 and 4 are diagrams of the forces acting on the beam during its movement, respectively, up and down.

The vibration isolation device contains foundation 1, spring vibration isolators 2 installed on foundation 1, joint 3 supported on spring vibration isolators 2, and friction vibration dampers 4 fixed on foundation 1 with a symmetrical vertical axis. The vibration damper contains a base 5 attached to the shaft 3, to which a metal disk 6 is attached, on the latter friction insert 7 is mounted, installed in the piston 8 of the membrane pneumatic cylinder. The pneumatic cylinder includes a cover 9, a membrane 10, a housing 11, a column 12 and a plate 13. The plate 13 is fixed 'on the foundation of the hammer 1.

The device vibration isolation works as follows.

The hammer 3 is mounted on spring vibration isolators in the foundation pit 1. Under the action of the weight of the hammer, spring vibration isolators are deformed

/ K, (1)

where 1 _st - deformation from a static load;

<3 is the weight of the hammer;

K. — Rigidity of spring vibration isolators.

From the workshop pneumatic network, air is supplied to the housing 11 (in Fig. 2, the direction of air flow is shown by an arrow) and creates a total force

Ρ = ρ ·} ·, (2)

where P is the force on the piston of the vibration damper; p is the air pressure;

/ - area of the piston; ζ is the number of cylinders.

After hitting the hammer feed parts

The downward movement begins, deforming the spring vibration isolators 2. The downward movement continues until all the kinetic energy acquired by the action after the impact turns into the potential elastic energy of the spring vibration isolators 2.

From the scheme of the forces acting on the side of the vibration damper 4 as it moves down (Fig. 3), the force P from the pressure of the friction insert 7 on the metal disk 6 creates on the contact surface a friction force equal to

Ρ = Ρ · μ, (3)

where P is the force on the piston of the vibration damper; μ - friction coefficient of friction

Couples disk - friction insert. Since the head moves downwards, the frictional force applied to the disk 6 is directed against the movement (in Fig. 3 it is indicated by P). The forces P and P can be decomposed into horizontal and vertical components Рв, Р ₁ and Рв, Р \ (Fig. 3). The horizontal components are balanced by the same

side symmetrical vibration damper.

In the force action scheme shown in FIG. 3, accepted angle <p = arc1 £ p. Under this condition, the vertical component of the friction forces is balanced by the vertical component of the force P acting on the vibration damper side, and the downward movement of the vibration occurs without a load on the vibration damper side. When moving down, he experiences resistance only from the side of spring vibration insulators 2, which allows to minimize the dynamic loads on the foundation and to improve the quality of vibration insulation.

From the diagram of the action of forces when moving upward, shown in FIG. 4, it can be seen that when moving upward, he experiences resistance from a vibration damper of a constant force equal to twice the projection of the friction forces on the vertical axis, which ensures effective damping of vibrations.

The economic effect of the introduction of the invention is achieved by increasing reliability.

Claims (1)

Claim A device for vibration isolation of a vertical forging hammer, containing spring vibration isolators placed between the shaft and the supporting surface of the foundation, as well as vibration dampers in the form of power cylinders, the rods of which are fitted with friction elements, while vibration dampers are installed between the side walls of the joint and the foundation, characterized in that increase reliability by reducing the dynamic loads, vibration dampers are made unilateral action, installed at an angle to the vertical axis of the hammer, determined with attitude Wed = AGC! §r, where φ is the angle between the friction surface of the vibration damper and the vertical axis of the hammer; μ is the coefficient of friction of a friction pair of chabot – friction elements. 1486253