JPH04246008A - Soundproof device for parts feeder - Google Patents

Abstract

PURPOSE:To secure such a sound proof device that is high in a soundproof effect as a noise countermeasure for a vibrating type parts feeder. CONSTITUTION:A noiseproof cover 3 is put on a parts feeder 1 installed on a base 2, while a damping material consisting of an inflated elastic tube or the like is interposed between the noise-roof cover 3 and the base 2 over the whole circumferential area, supporting the cover 3 on the base 2 by means of vibro-isolating supporting, through which any resonance of the cover 3 being induced by vibration spreading from the parts feeder 1 through the base 2 is avoided, thereby preventing an abnormal increase in a noise level of low frequency sound from occurring.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing device for a vibrating parts feeder, which prevents noise generated from the parts feeder from propagating to the surrounding area.

0002

[Prior Art] Parts feeders are often used on assembly lines for electrical equipment and the like to line up and feed workpieces (parts such as bolts and nuts) to automatic assembly machines. By the way, the vibrating parts feeder is
During operation, in addition to the vibration noise of the parts feeder body, impact noise is generated when the workpieces come into contact with each other and between the workpieces and the bowl of the parts feeder. In this case, the noise generated by the feeder itself is a humming sound (125
(low-frequency sound around Hz), whereas the impact sound caused by the collision of a workpiece is a harsh noise with a high noise level (1
(high frequency sound above KHz). Therefore, as a soundproofing measure, conventional efforts have been made to cover the parts feeder, which is the source of noise, with a soundproof cover (for example, made from a combination of synthetic resin plates) to prevent the noise from propagating to the surrounding area. being done. In addition, during implementation, the chute of the parts feeder shall be drawn out through a small window opened in the side wall of the soundproof cover.

0003

[Problems to be Solved by the Invention] However, in the structure in which the soundproof cover is directly installed on the base (installation surface of the parts feeder), the following problems remain. That is, although high-frequency sounds that try to propagate from the parts feeder to the surroundings are well insulated by the soundproof cover, there are many cases where the noise level of low-frequency sounds becomes abnormally high. According to the inventors' investigation into the cause of this increase in noise level, the cause is that the vibration of the parts feeder itself is transmitted through the base and propagated to the soundproof cover, and the soundproof cover resonates due to low frequency vibrations. It turns out that this is because the soundproof cover itself becomes a noise source.

The present invention has been made in view of the above points, and based on the results of the investigation of the causes described above, it is an object of the present invention to provide a soundproofing device for a parts feeder that has a high soundproofing effect by avoiding the induction of resonance in the soundproofing cover. With the goal.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention covers a parts feeder installed on a base with a soundproof cover, and provides vibration isolation between the entire bottom area of the soundproof cover and the base. The soundproof cover shall be supported against vibration by interposing a material to the base.

[0006] Furthermore, in the above structure, it is preferable that the vibration isolating material is an elastic tube inflated with air, and that the sound insulating cover is preferably locked to the base at least at one point on the periphery via a pin. . Furthermore, a support structure can be adopted in which the elastic tube described above is guided and held by being sandwiched between a soundproof cover and a gutter-like holding guide attached to the base side.

[0007]

[Operation] In the above configuration, the vibration isolating material works to absorb and dampen the vibrations that propagate through the base from the parts feeder to the vibration isolation cover, so the sound insulation cover induces resonance due to the vibration of the parts feeder body. This prevents the noise level of low frequency sounds from increasing abnormally. Here, as a vibration damping material, an elastic tube inflated with air has a large vibration damping effect because it functions as an air spring, and by appropriately selecting the air pressure sealed in the elastic tube, the soundproofing material can be prevented from being crushed by the weight of the soundproof cover. The cover can be elastically supported. Moreover, since the elastic tube closes the gap between the soundproof cover and the base over the entire circumference,
A sufficient sound insulation effect is ensured even against high-frequency sounds that propagate through the air from the parts feeder to the surrounding area.

[0008] Furthermore, by locking the soundproof cover to the base at least at one point on the periphery via a pin, it is possible to prevent the soundproof cover from unduly shifting from its normal position and coming into contact with the chute of the parts feeder during operation of the parts feeder. This prevents interference such as Furthermore, the support structure in which the chute elastic tube of the parts feeder is sandwiched between the soundproof cover and the gutter-shaped support guide attached to the base side allows the elastic tube to be stably held in a predetermined position, and the soundproof cover can be installed on site. Construction is easy.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. First, in FIG. 1, reference numeral 1 denotes a vibrating parts feeder that supplies workpieces to the outside while rotating them in a bowl. 1a denotes a parts feeder 1.
2 is the installation base (steel plate) of the parts feeder 1, 3 is a cylindrical soundproof cover that surrounds the parts feeder 1, and 4 is an automatic product assembly that receives the workpieces from the parts feeder 1. (a linear feeder may be arranged between the parts feeder 1 chute 1a and the automatic assembly machine 4), and the soundproof cover 3 has a vibration isolating material 5 between the entire periphery of the bottom flange 3a and the base 2. It is interposed and supported on the base in a vibration-proof manner. The chute 1a of the parts feeder 1 is drawn out through a small window 3b opened in the side wall of the soundproof cover 3.

Next, the vibration isolating material 5 shown in FIG. 1 and its specific mounting structure are shown in FIG. That is, in the illustrated structure, an elastic tube 6 (for example, a bicycle tire tube) inflated with air is used as a vibration isolating material, and the elastic tube 6 is attached to the bottom flange 3a of the soundproof cover 3 and the base 2 at the top and bottom, respectively. It is guided and held by being sandwiched between support guides 7 having a U-shaped cross section that are mounted facing each other. Furthermore, a positioning pin 8 is implanted in the bottom flange 3a of the soundproof cover 3 at least at one location on the periphery, and the tip of the pin 8 opens at a predetermined position in the base 2, leaving some play in the hole 2a. It is loosely locked. In addition, 9 is an annular vibration-proof rubber fitted into the hole 2a.

With this configuration, when the parts feeder 1 is in operation, vibrations from the parts feeder main body that are transmitted through the base 2 and try to propagate to the soundproof cover 3 are absorbed by the vibration isolating material 5 in the middle of the propagation path, and the vibrations are absorbed by the soundproof cover 3. 3, thereby avoiding induction of resonance in the vibration-proof cover 3 and an abnormal increase in the noise level caused by the resonance of the sound-proof cover. Regarding the anti-vibration support structure of the sound-insulating cover 3 that uses an elastic tube 6 inflated with air as a vibration-isolating material, according to actual measurements of the noise level on the outside of the sound-insulating cover 3, it was found that the sound-insulating cover 3 was not supported in a preventive manner. lower frequency range (
It has been confirmed that the noise level (around 100Hz) can be reduced by 13dB.

Furthermore, in the above structure, the elastic tube 6 is fitted and held between the vertically facing gutter-shaped support guides 7, so that it is stably held in a fixed position. moreover,
Since the positioning pin 8 installed in the soundproof cover 3 is locked in the hole 2a of the base 2, the soundproof cover 3 will not unduly shift from the predetermined position, and the soundproof cover 3 will not move while the parts feeder 1 is operating. Interference such as contact with the chute 1a of the parts feeder 1 can be prevented. Note that since the vibration-proof rubber 9 is fitted into the hole 2a, even if the tip of the positioning pin 8 comes into contact with it, vibrations from the parts feeder 1 are hardly transmitted to the sound-proof cover 3.

[0013]

[Effects of the Invention] Since the soundproofing device for a parts feeder according to the present invention is constructed as described above, it achieves the following effects. In other words, by interposing the vibration isolating material between the soundproof cover and the parts feeder installation base, the vibration isolating material absorbs the vibrations that propagate from the parts feeder to the vibration isolating cover through the base. This can be used as a propagation path to prevent resonance of the soundproof cover induced by low-frequency vibrations of the parts feeder body, and prevent the soundproof cover from becoming a sound source and causing the noise level to increase abnormally.

[0014] Furthermore, by using an elastic tube inflated with air as a vibration isolating material, it is possible to prevent sound leakage from the sound insulation cover and obtain a high vibration isolation effect between the sound insulation cover and the base. Adoption of a support structure in which the tube is held between gutter-like support guides makes it possible to stably hold the elastic tube and facilitate installation. Further, by locking the periphery of the soundproof cover to the base in a fixed position, it is possible to prevent the soundproof cover and the chute pulled out from the parts feeder from coming into contact with each other and unduly interfering with each other.

[Brief explanation of the drawing]

[Figure 1] Overall configuration diagram of an embodiment of the present invention

[Figure 2] Detailed structural diagram of the vibration absorber mounting part in Figure 1

[Explanation of symbols]

1 Parts feeder 2 Base 3. Soundproof cover 5. Vibration isolating material 6 Elastic tube 7 Support guide 8 Positioning pin

Claims (4)

[Claims] Claim 1: A parts feeder installed on a base is covered with a soundproof cover, and a vibration isolating material is interposed between the entire bottom area of the soundproof cover and the base to support the soundproof cover against vibration. A soundproofing device for a parts feeder characterized by: 2. The soundproofing device for a parts feeder according to claim 1, wherein the vibrationproofing material is an elastic tube inflated with air. 3. The soundproofing device for a parts feeder according to claim 1, wherein the soundproofing cover is locked to the base via a pin at least at one location on the periphery. 4. The soundproofing device for a parts feeder according to claim 2, wherein the elastic tube is held between a soundproofing cover and a gutter-like holding guide attached to the base side.