JPS6372929A - Vibration isolating rubber - Google Patents

Abstract

PURPOSE:To eliminate temp. change during using and stabilize performance by either embedding or closely providing a heating means in a rubber vibration isolator and heating to a defined temp. CONSTITUTION:A heating wire 20 is embedded inside a rubber vibration isolator 6, and the value of a current fed to the heating wire 20 is controlled so that the temp. of the rubber vibration isolator 6 is a defined temp. which is sufficiently higher than the ambient temp by means of a controller 40. Accordingly, since the temp. of the rubber isolating vibrator can be kept constant regardless of operating conditions, a stable performance can be obtained without causing change in vibration isolating performance.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to anti-vibration rubber.

[Conventional technology and its problems]

Various shapes of anti-vibration rubber are known for supporting a vibrating machine on a floor or base and preventing vibrations from being transmitted from the vibrating machine to the floor or base. For example, there are some shapes as shown in FIGS. 6 to 8.

In FIG. 6, the screw portion 3υ is screwed onto the drive unit mounting base of the vibrator 1, for example, a parts feeder, and the rubber portion 3 is placed on the floor or base. A plurality of such vibration isolators are used to support the parts feeder.

In FIG. 7, the threaded portion (to) is screwed onto, for example, the drive unit mounting base, and the other threaded portion (b) is screwed onto the floor or base. The rubber portion C33 has a busy cylindrical shape as in FIG. 6, but in FIG. 7 it is sandwiched between disc-shaped metals.

Figure 8 shows a menacing anti-vibration rubber field with many protrusions on its surface.
) is formed. The vibrator is placed on top of this.

The above rubber part (3) is made of synthetic rubber, natural rubber, or other materials, but as a general characteristic of rubber, its elastic constant changes as the temperature changes.

For example, when used for vibration isolation in a vibrating parts feeder, even if the ambient temperature is constant, the temperature increases due to internal friction as the vibration takes place, rather than the vibration itself. This changes the elastic constant of this anti-vibration rubber, which ultimately changes the natural frequency of the entire parts feeder, causing the moving part (pole) to change.
The amplitude changes. Generally, parts feeders are driven at a frequency close to the natural frequency, so the amplitude changes are large. This not only changes the throughput of the parts feeder, but also may make it impossible to perform any sort of alignment action.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vibration isolating rubber whose amplitude hardly changes even when a vibrator is continuously driven.

[Means for solving problems]

The above object is to provide a vibration isolating rubber for supporting a vibrating machine on a floor or a base and for preventing vibrations from being transmitted from the vibrating machine to the floor or base, with a heating means buried or close to it. This is achieved by a vibration isolating rubber characterized in that it is heated to a predetermined temperature by heating.

[For production]

The anti-vibration rubber is heated to a predetermined temperature by the heating means, so
Its elastic constant is assumed to be constant. Therefore, the amplitude of the vibrator supported by this does not change.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows a first embodiment of the present invention, and in this case, the present invention k
Another type of vibration-proof rubber is applied to vibrating parts feeders. In FIG. 1, a ball (1) is connected to a base (3) and a plurality of inclined plates (2) K. Base (3
) An electromagnet (5) is fixed on which a coil (4) is wound. When Ic current is applied to the coil (4), a vibration force is generated in the K screw as is well known.

The screw vibration drive unit configured as described above is covered with a cylindrical cover (7). A spiral track is formed in the ball (1) along its inner wall in a known manner. The vibrating parts feeder is constructed as described above, and its entire structure consists of multiple vibration-proof rubbers (6).
supported on a floor or base as shown.

FIG. 3 shows the details of the vibration isolating rubber (6), and as shown in the figure, it has a cylindrical shape and a heating wire (1) is embedded inside it. The anti-vibration rubber (6) is heated by passing current through the heating wire (a), and the temperature is measured by a thermocouple, for example, and the temperature of the anti-vibration rubber is set to a predetermined value by a controller (4G). The value of the current is controlled so that the current value is sufficiently higher than the ambient temperature.

The first embodiment of the present invention is constructed as described above, and its operation will be explained below. When an alternating current is applied to the coil (4), the ball (1) undergoes torsional vibration in a known manner. This vibration is transmitted to the vibration isolating rubber (6) through the plate spring (2) and the base (3). The vibration isolating rubber (6) is heated to a predetermined temperature, and the temperature does not change as the parts feeder operates, so its elastic constant does not change.

Therefore, as with a conventional vibrating parts feeder, the temperature of the vibration isolating rubber gradually rises from the ambient temperature as it is operated, its elastic constant changes, and the swing width of the ball (1) does not change with this, but remains almost constant. Therefore, a certain amount of processing power can be obtained. Furthermore, if the balls (1) are equipped with some sort of alignment means, this alignment ability can be kept constant, and the loss of that ability, which has been seen in the past, will not occur.

FIG. 2 shows a second embodiment of the present invention applied to a vibratory feeder.

In Fig. 2, the trough Ql) is connected to the base α4 and a pair of front and rear plate springs, and the coil (4
) is fixed. Also, trough σ
A movable core (c) is fixed to the bottom of η so as to face the electromagnet (17) with a gap therebetween. α■ is a weight part for weight balance. The entire vibratory feeder is supported on a base or floor by a vibration-proof rubber according to the present invention.

Figure 4 shows the details of the vibration isolating rubber (to) in Figure 2.
211 is buried, and a heat medium such as heated water or oil is passed through this to heat the exfoliation prevention rubber. As in the first embodiment, the temperature g is measured by a thermocouple, and the controller +40
As a result, the heat medium introduced into the pipe 211 is heated so that the temperature of the vibration isolating rubber reaches a predetermined value (higher than the ambient temperature).

The second embodiment is constructed as described above, and its operation will be explained below.

When an alternating current is applied to the coil, the trough α oscillates in the direction shown by arrow a, and this vibration force is applied to the leaf spring Q3. The vibration is transmitted to the anti-vibration rubber via the base α.

Since the vibration isolating rubber (to) is heated to a predetermined temperature by the heat medium flowing inside the pipe 12IJ, the temperature of the vibration isolating rubber (to) does not increase and remains constant as the feeder operates, so its elastic constant is The width of the trough U of the feeder is constant. A certain amount of processing power can be obtained from this K.

Although each embodiment of the present invention is configured as described above, the present invention is of course not limited to these, and various modifications can be made based on the technical idea of the present invention. For example, although a vibrating parts feeder and a vibrating feeder have been described above as vibrators, the present invention is not limited to these, and the present invention can be applied to general vibrators.

Furthermore, the shape of the vibration isolating rubber is not limited to that shown in the figure, but may be a plate-shaped vibration isolating rubber as shown in FIG. 5, for example, in which electric wires are buried as shown. . In this modification, as in the embodiment, the temperature is measured by a thermocouple, and a controller (41) controls the strength of the current flowing through the heating wire so that the temperature of the vibration isolating rubber becomes constant. Ru.

In addition, in the above embodiments, the heating wire or the pipe Qυ through which the heating medium flows is not limited to embedding the vibration-proof rubber embedded in the vibration-proof rubber to heat the vibration-proof rubber to a predetermined temperature. may be wrapped around the vibration isolating rubber.

〔Effect of the invention〕

As described above, according to the anti-vibration rubber of the present invention, even if the vibrator is operated continuously, the vibration amplitude hardly changes and a predetermined throughput can be obtained. Furthermore, if the vibrator is a parts feeder and is equipped with some sort of alignment means, the alignment ability can be reliably obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a vibratory parts feeder according to a first embodiment of the present invention, FIG. 2 is a side view of a vibratory feeder according to a second embodiment of the present invention, and FIG. 3 is applied to FIG. 1. FIG. 4 is an enlarged partially broken perspective view of the vibration isolating rubber applied to the vibration feeder of FIG. 2, and FIG. 5 is an enlarged perspective view showing a modified example of the vibration isolating rubber. 6, 7, and 8 are enlarged perspective views showing conventional examples of vibration isolating rubber. In addition, in the figure.

Claims (1)

[Claims] In a vibration-proof rubber for supporting a vibrating machine on a floor or a base and preventing vibrations from being transmitted from the vibrating machine to the floor or base, heating means can be buried or placed close to the vibration-proof rubber to achieve a predetermined temperature. Anti-vibration rubber characterized by being heated to .