JPS6129419B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a force-controlled vibration damping device that can actively damp vibrations in vibrating machines and the like to prevent the occurrence of pollution vibrations and the like.

Vibrating machines that induce strong vibrations, such as forging machines and press machines, are installed on foundations formed in the ground. The vibrations are transmitted from the foundation to the foundation, and then from the foundation to other areas via the transmission characteristics of the ground, which can result in pollution vibrations.

A typical example of conventional measures taken to prevent such pollution vibrations is the elastic support method, in which the vibrating machine is supported on the foundation using springs, etc. As a result of the elastically supported vibrating machine itself moving, the workability of the vibrating machine is impaired, and when the vibrating machine is used for precision machining of products, the machining accuracy is reduced. In addition, it shortens the lifespan of the machine, and it also has the disadvantage of becoming a source of pollution vibration, especially low-frequency vibration pollution.Furthermore, it cannot be applied at all when the vibration of the machine itself is not tolerated. There were flaws.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a vibration damping device that suppresses vibrations in the legs of a vibrating machine and enables rigid support of the vibrating machine. be.

Corresponding to this purpose, the force control type vibration damping device of the present invention is provided with a movable additional mass member and a force detector attached to the vibrated part, so that a force detector acting on the vibrated part is applied. A vibration force is detected by the force detector, and an excitation force due to an inertial force generated by driving the additional mass member based on a signal from the force detector is applied to the vibrated part, The additional mass member is configured to be driven such that the deviation excitation force between another excitation force acting on the vibrated part and the excitation force due to the inertia force generated by driving the additional mass member is small. It is characterized by what it did.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

In FIG. 1, reference numeral 2 denotes a forging machine, and the forging machine 2 is equipped with an operating section 5 consisting of an anvil 3 and a hammer 4, and a plurality of legs 6 at its lower end. The forging machine 2 is mounted on the foundation 7 at its legs 6, so that only the legs 6 are in a force transmitting relation to the foundation 7. This leg 6 has a disturbance canceller 8.
is fixed. As shown in FIGS. 1 and 2, the disturbance canceller 8 includes a casing 9 and an additional mass 11, and the additional mass 11 is movable relative to the casing 9. A casing 9 is fixed to the leg 6 of the forging machine 2, a servo valve 12 is housed and fixed in the casing 9, and an additional mass 11 is fixed to the actuator 13 of the disturbance canceller 8. Therefore, by supplying pressure oil to the front and rear of the actuator 13 as shown by the arrows, the actuator 13 moves due to the differential pressure, and the additional mass 11 integrated therewith also moves, producing an inertial force. Further, a force detector 14 is attached to the leg portion 6. A control system 15 is prepared to control the drive of the disturbance canceller 8. The control system 15 includes a control compensation circuit 16, a power amplifier 17, and a torque motor 18, as shown in FIG.
The control input voltage Δ is input from the control compensation circuit 16 to the power amplifier 17, and the output voltage Δe of the force detector 14 that has detected
is input to the torque motor 18, and the torque motor 18
The pressure p of the pressure oil supplied to the disturbance canceller 8 by
Or control the flow rate q.

In the vibration damping device 1 configured in this way,
When the forging machine 2 itself vibrates due to the operation of the forging machine 2, and an excitation force F is applied to the leg part 6, which is a rigid support part, the force detector 14 detects this and uses the signal as a signal. Based on control compensation circuit 16, power amplifier 1
7. The torque motor 18 functions and the disturbance canceller 8
is activated. In the disturbance canceller 8, the additional mass 11 moves to generate an inertial force Mdxd, which is input to the leg section 6 as an excitation force. Inertial force Md¨x
As a result of controlling by the control system 15 so that the excitation force caused by d and the excitation force F cancel each other out, and the deviation excitation force ΔF between the two becomes small, the excitation force from the leg part 6 to the foundation 7
Vibrations transmitted to the ground characteristics 19 through the ground can be reduced.

[Example] A structure 21 as shown in FIG. 4 was installed on a foundation 7 and rigidly supported by legs 6a and 6b. This structure 21
was subjected to vibration by an external force of F=1200Kg. When the disturbance canceller 8, which has an additional mass of 40 kg, is off, an external force of F ₁ = 1/2 x 1200 kg = 600 kg is measured on the legs 6a and 6b by the force detector 14 using a piezoelectric element. When the disturbance canceller was driven with the compensation circuit 16 optimally set, the external force was immediately suppressed to 10 kg or less. The measurement results are shown in FIG.

As is clear from the above description, according to the present invention, vibrations in the legs of a vibrating machine can be suppressed, the vibrating machine can be rigidly supported, and the adverse effects caused by elastic support can be avoided. In addition, as vibrations are not transmitted to the ground, foundation work is not required, and the installation location of the machine is not affected by ground characteristics. Moreover, the present invention can be applied to general forces such as steady vibration force and impact force, and the vibration suppression function can be adjusted arbitrarily by changing the size and stroke of the additional mass of the disturbance canceller. Can be adjusted.

Note that the above explanation describes the vibration damping device of the present invention,
Although the present invention has been described in an embodiment in which the present invention is directly applied to the main body of a vibrating machine, the present invention can be similarly applied not only to the vibrating machine itself but also to a support stand on which the vibrating machine is placed and supported. That is, such an embodiment is shown in FIG. 6, in which the support stand 22 has a board 23 and legs 24a, 24b...
..., and a disturbance canceller 8 and a force detector 14 are attached corresponding to the legs 24a, 24b, .... However, the number and position of the legs 24a, 24b... are not limited to those shown in the figure, and the disturbance canceller 8 and the force detector 14
a, 24b, . . .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a forging machine to which the present invention is applied, Fig. 2 is a vertical sectional view showing a disturbance canceller, and Fig. 3
The figure is a block diagram showing one embodiment of the vibration absorbing device.
FIG. 5 is a front explanatory view showing the implementation conditions of the example, FIG. 5 is a graph showing the measurement results, and FIG. 6 is a perspective view showing a support base according to another example of the present invention. 2... Forging machine, 6... Leg, 8... Disturbance canceller, 11... Load mass, 14... Force detector, 15
...Control system, 23...Support stand.

Claims (1)

[Claims] 1. A movable additional mass member is provided, and a force detector is attached to the vibrated part, the excitation force acting on the vibrated part is detected by the force detector, and the force detector detects the excitation force acting on the vibrated part. An excitation force due to an inertial force generated by driving the additional mass member based on a signal is applied to the vibrated part, and another excitation force acting on the vibrated part and the additional mass member A force control type vibration damping device, characterized in that the additional mass member is configured to be driven such that a deviation excitation force from an excitation force due to an inertial force generated by driving the additional mass member is small.