JP2001098581A - Industrial machine with sound absorbing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an industrial machine mounted with a sound absorbing material having high light resistance, the long service life and high recyclability. SOLUTION: An almost plate-like sound absorbing material 12 by covering a surface of PET nonwoven fabric 13 with a skin material (a span bond) 14 is mounted on a position for surrounding a noise generating source and/or an inner wall surface of a suction/exhaust duct to a space for arranging the noise generating source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial machine equipped with a sound absorbing material in which a sound absorbing material is attached to a required portion in order to reduce noise generated from a noise source such as an engine.

[0002]

2. Description of the Related Art Conventionally, in the case of industrial machines such as construction machines, agricultural machines, and transportation machines, noise generated by an engine, a pump, a fan, and the like mounted on such an industrial machine leaks to the outside. Alternatively, since it causes discomfort to the surrounding environment, a noise absorbing material is attached to a required portion such as an inner wall of an engine room to reduce noise. In this case, a sound absorbing material made of urethane is most commonly used, and the sound absorbing material is fixed by an adhesive, a pin, a bracket, or the like.

[0003]

However, the conventional urethane sound-absorbing material has a problem in that it has a problem in light resistance, is greatly affected by light deterioration, and is not satisfactory in terms of life. In addition, in the case of this conventional sound absorbing material, there is also a problem that recyclability is low.

The present invention has been made in view of the above problems, and provides an industrial machine with a sound absorbing material provided with a sound absorbing material having high light resistance, a long life, and a high recyclability. The purpose is to do so.

[0005]

Means for Solving the Problems and Functions / Effects To achieve the above object, an industrial machine with a sound absorbing material according to the present invention comprises a substantially flat sound absorbing material in which the surface of a PET non-woven fabric is covered with a skin material. Is mounted on the inner wall surface of the air intake / exhaust duct with respect to the position surrounding the noise source and / or the space where the noise source is installed.

According to the present invention, since a sound absorbing material mainly composed of a PET nonwoven fabric is used, even if a sound absorbing material having a thickness smaller than that of a conventional urethane sound absorbing material is used, the sound absorbing material is equal to or more than the urethane sound absorbing material. Can be secured. In addition, since the PET nonwoven fabric has high light resistance, the influence of light deterioration can be minimized, and the life can be significantly improved. Another advantage is that the recyclability is higher than that of the conventional one. In this case, if a spunbond made of PET is used as the skin material, the recycling becomes easier. Furthermore, since the sound-absorbing material according to the present invention is formed in a substantially flat plate shape, a forming die for forming a complicated curved surface is unnecessary, and the manufacturing process can be simplified, and the manufacturing cost can be reduced. Can be reduced.

[0007] In the present invention, the end surface of the sound absorbing material,
It is preferable to perform a peeling prevention process for preventing the sound absorbing material from peeling. In this way, for example, even when water is sprayed on the sound absorbing material using a water spray when performing car washing, the end face of the sound absorbing material is protected by this peeling prevention processing, and the end of the sound absorbing material is protected by the water pressure of the water spray. Peeling can be prevented, and durability can be further improved.

It is preferable that a cutout for attaching the sound absorbing material is formed on the back surface side of the sound absorbing material according to the curved shape of the mounting portion. As a result, since the sound absorbing material can be bent at the cut portion, the sound absorbing material can be closely adhered along the curved shape of the mounting portion, and the occurrence of peeling when the sound absorbing material is attached to the curved surface portion can be prevented. Can be.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of an industrial machine with a sound absorbing material according to the present invention will be described with reference to the drawings.

In this embodiment, an example applied to a hydraulic excavator is illustrated. FIG. 1 is a side view of a hydraulic shovel according to an embodiment of the present invention, and FIG. 2 is a plan view of the hydraulic shovel.

In the hydraulic excavator 1 of the present embodiment, an upper revolving unit 4 is swingably provided via a swing circle 3 above a lower traveling unit 2 having a crawler traveling device. An operator cab 5 is disposed at a front portion of the upper revolving unit 4, a machine cab 6 is disposed at a position adjacent to the rear of the operator cab 5, and a counterweight 7 is disposed further behind the operator cab 5. A working machine 8 including a boom, an arm, and a bucket is arranged on a side.

As shown in FIG. 3 (partial perspective view of the machine cab) and FIG. 4 (sectional view taken along the line AA in FIG. 3), the machine cab 6 has an engine 9, a hydraulic device 10 and a fan 11 inside. The lower surface is covered with an under cover 6a, the engine hood 6b is disposed on the upper surface so as to be openable and closable, and the left and right doors 6c and 6d for inspection are disposed on the left and right sides, respectively, so as to be openable and closable. The inner wall surface of the machine cab 6, the upper surface of the under cover 6a, the lower surface of the engine hood 6b, the left door 6c
The sound absorbing material 12 is attached to the inner surface of the right door 6d. Although not shown, the counterweight 7
The sound absorbing material 12 is also attached to the inner wall surface of the.

FIG. 5 is a perspective view of the sound absorbing material used in the present embodiment. This sound absorbing material 12 is shown in FIG.
As shown in (a), a spunbond 14 as a skin material is laminated on one surface (front surface) of a polyethylene terephthalate (PET) nonwoven fabric 13 by whole surface bonding, and is formed into a substantially flat plate shape. An adhesive is applied to the (back surface) side, and the surface is covered with release paper 15. Here, the spun bond 14 is a general term for a long-fiber nonwoven fabric made of a polymer of 100% polyester, and more specifically, for example, it is preferable to use Toyobo 6A-01AD. The sound absorbing material 12 is used after being cut into required dimensions from a raw material formed into a predetermined width and a predetermined length.

By the way, the sound absorbing material 1 shown in FIG.
In the case of No. 2, since only the surface of the PET non-woven fabric 13 is covered with the spun bond 14, when this sound absorbing material 12 is used by attaching it to the inner surfaces of the doors 6c and 6d of the machine cab 6, for example, Due to the water pressure of the water spray at the time of car washing, peeling may occur between the PET nonwoven fabric 13 and the spun bond 14 at the end of the sound absorbing material 12. In order to prevent this, it is preferable to bond the spun bond 14 also to the end face (upper end face, both end faces) of the PET non-woven fabric 13 like the sound absorbing material 12 shown in FIG. Note that P
The lower end surface of the ET non-woven fabric 13 is preferably exposed so that the water absorbed by the PET non-woven fabric 13 can easily drop.

FIGS. 6 and 7 show specific examples of the sound absorbing material attached to the inner surface of the door of the machine cab. As shown in these figures, the sound absorbing material 1 attached to the inner surface of the door
2 has a notch in the portion corresponding to the door knob, and PET so that the PET non-woven fabric 13 and the spun bond 14 do not peel off as described above.
At the end of the nonwoven fabric 13 (upper end, both side ends, and the inner edge of the notch), one side of the elongated spunbond 14 is bent into an L shape so as to cover the spunbond 14 on the surface, and the PET nonwoven fabric 13 End face and surface spunbond 14
Adhered to the upper surface of the

FIG. 8 shows how the sound absorbing material is attached to the inner surface of the engine hood of the machine cab. When the sound absorbing material 12 is attached to the inner surface of the engine hood 6b, the side of the engine hood 6b as a mounting portion of the sound absorbing material 12 has a curved shape.
Cuts 16, 16 are provided on the three sides, and the cuts 16, 16 are provided.
It is preferable to bend the sound absorbing material 12 at the location 16 and attach the sound absorbing material 12 along the curved shape of the engine hood 6b. By doing so, the sound absorbing material 12 can be made to have a better adhesion state as compared with a case where the flat sound absorbing material 12 is simply bent to conform to a curved surface shape, and the sound absorbing material 12 can be peeled off. Can be reliably prevented.

Next, the sound absorbing material 12 used in this embodiment
In order to investigate the sound absorbing effect of the sound absorption, the sound absorption coefficient by the reverberation room method was measured. The measurement result is shown in the graph of FIG.
FIG. 9 also shows the sound absorption coefficient of a conventional urethane sound absorbing material as a comparative example. As is clear from this graph, the sound absorbing material of this embodiment (PET sound absorbing material)
The sound absorbing material having a thickness of 35 mm (35 t) has almost the same sound absorption characteristics as the conventional sound absorbing material (urethane sound absorbing material) having a thickness of 50 mm (50 t), and the sound absorbing material of the present embodiment has a thickness of 25 mm (25 t). ) Has a sound absorbing characteristic substantially equal to that of the conventional sound absorbing material having a thickness of 30 mm (30 t). Therefore, it can be said that the sound absorbing material of the present embodiment can obtain the same or higher sound absorbing coefficient than the sound absorbing material of the conventional example even if the thickness is reduced.

FIGS. 10 to 12 show various embodiments of the method of fixing the sound absorbing material. First, FIG.
Fig. 3 shows an example of attachment to a site where water does not substantially enter. In this case, the sound absorbing material 12 is configured such that the spun bond 14 is laminated only on the surface of the PET nonwoven fabric 13 (see FIG. 5A). FIG. 10A shows an example in which the sound absorbing material 12 is adhered with an adhesive 17. This method is applied to a vehicle having a low impact frequency, such as a wheel loader.
It is used in wheeled vehicles such as dumps and graders or in hydraulic excavators. Further, even in a vehicle having a high impact frequency, the vehicle may be employed in a portion where there is little risk of falling off, such as the upper surface of the under cover 6a. FIG. 10B shows an example in which the sound absorbing material 12 is fixed by mechanical fixing means such as a pin or a bracket 18. This method is employed in a vehicle having a large impact frequency, such as a bulldozer.

Next, FIG. 11 shows an example of attachment to a site where water has entered. In the example shown in FIG. 11A, the sound absorbing material 12 is configured by bonding a spun bond 14 to a surface and an end surface of a PET nonwoven fabric 13 (FIG. 5).
(See (b)), the sound absorbing material 12 is adhered by the adhesive 17. In the example shown in FIG. 11B, the end surface of the sound absorbing material 12 is sandwiched between the hat-shaped cross-section ribs 19 without the spunbond on the end surface. Note that the methods shown in FIGS. 11A and 11B are adopted for vehicles having a low impact frequency. On the other hand, in the example shown in FIG. 11 (c), the sound absorbing material 12 formed by bonding the spun bond 14 to the surface and the end face of the PET non-woven fabric 13 is used.
It is fixed by a mechanical fixing means such as a pin or a bracket 18. In addition, in the example shown in FIG. 11D, the end surface is omitted from the spun bond, and the end surface of the sound absorbing material 12 is fixed by being sandwiched between the Z-shaped cross-section ribs 20 in addition to sticking with the adhesive 17. It is. The methods shown in FIGS. 11C and 11D are adopted for vehicles having a low impact frequency.

Next, FIG. 12 shows an example of attachment to a site where a large amount of water enters. In the example shown in FIG. 12A, the sound absorbing material 12 is configured by bonding a spun bond 14 to the front surface, the back surface, and the end surface of a PET nonwoven fabric 13, and the sound absorbing material 12 is attached with an adhesive 17. Have been to be. In the example shown in FIG.
A sound absorbing material 12 similar to that shown in FIG. 12A is used, and the sound absorbing material 12 is fixed by a mechanical fixing means such as a pin or a bracket 18. FIG. 11 (c)
In the example shown in FIG. 1, a sound absorbing material 12 formed by bonding a spun bond 14 to the surface and the end face of a PET nonwoven fabric 13
Is adhered so that the end surface of the sound absorbing material 12 is sandwiched between the Z-shaped cross-section ribs 20 in addition to the adhesive 17.
The method shown in FIG. 12A is adopted for a vehicle with a low impact frequency, and the method shown in FIGS. 11B and 11C is adopted for a vehicle with a high impact frequency.

In this embodiment, the case where the sound absorbing material 12 is attached to the inner wall surface of the machine cab 6 or the inner wall surface of the counterweight 7 has been described. However, the mounting position of the sound absorbing material 12 is only at those positions. The invention is not limited thereto, and may be attached to inner wall surfaces of an intake duct for introducing air into the machine cab 6 and an exhaust duct for discharging air from the machine cab 6. FIG. 13 shows the sound absorbing material 12 on the inner wall surface of the intake duct and the inner wall surface of the exhaust duct.
Is shown. In this example, the fan 11
The air that cools the radiator 21 and the oil cooler 22 is sucked through the intake duct 23 by the rotation of the air, and the air that has passed through the radiator 21 and the oil cooler 22
After passing through the exhaust duct 24, the opening of the engine hood 6
b. Here, the sound absorbing material 12 is attached to the inner wall surface of the intake duct 23 and the inner wall surface of the exhaust duct 24 to exhibit a sound absorbing effect.

The sound absorbing material 12 can be attached to the inner wall surface of the operator cab or other parts of the vehicle body.

In this embodiment, the spun bond is applied as a process for preventing the end surface of the sound absorbing material from peeling. Another example of the peel preventing process is to melt the end surface of the PET non-woven fabric by heat. Examples of the method include a method of hardening, a method of dissolving the end face of the PET non-woven fabric with a mold resin, and a method of sticking an adhesive tape such as a vinyl tape to the end face of the PET non-woven fabric.

In the present embodiment, the excavator has been described as an example, but the present invention is applied not only to construction machines other than the excavator but also to various industrial machines including agricultural machines and transport machines. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel according to one embodiment of the present invention.

FIG. 2 is a plan view of the hydraulic shovel of the embodiment.

FIG. 3 is a partial perspective view of a machine cab.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIGS. 5A and 5B are perspective views of a sound absorbing material.

FIG. 6 is a perspective view showing a state in which a sound absorbing material is attached to an inner surface of a door of the machine cab.

FIGS. 7A and 7B are views showing a sound absorbing material attached to an inner surface of a door.

FIGS. 8A, 8B, and 8C are views showing a state in which a sound absorbing material is attached to an inner surface of an engine hood.

FIG. 9 is a sound absorption characteristic comparison diagram between the present embodiment and a comparative example.

FIGS. 10A and 10B are examples (1) illustrating a method of fixing a sound absorbing material.

FIGS. 11 (a), (b), (c) and (d) are examples (2) showing a method of fixing a sound absorbing material.

FIGS. 12A, 12B, and 12C are examples (3) showing a method of fixing a sound absorbing material.

FIG. 13 is a view showing another embodiment of the sound absorbing material attaching portion.

[Explanation of symbols]

Reference Signs List 1 hydraulic excavator 2 lower traveling body 4 upper traveling body 5 operation cab 6 machine cab 6a under cover 6b engine hood 6c left door 6d right door 7 counterweight 8 work machine 9 engine 10 hydraulic equipment 11 fan 12 sound absorbing material 13 polyethylene terephthalate (PET) Non-woven fabric 14 Spunbond (skin material) 15 Release paper 16 Cut 17 Adhesive 18 Pin or bracket 19 Hat-shaped cross section rib 20 Z-shaped cross section rib 23 Intake duct 24 Exhaust duct

Claims (3)

[Claims] 1. A substantially flat sound absorbing material in which the surface of a PET non-woven fabric is covered with a skin material is placed inside a suction / exhaust duct at a position surrounding a noise generating source and / or a space where the noise generating source is installed. An industrial machine with sound absorbing material, which is mounted on a wall. 2. The industrial machine with a sound-absorbing material according to claim 1, wherein an end face of the sound-absorbing material is subjected to a peeling preventing process for preventing the sound absorbing material from peeling. 3. The industrial machine with a sound-absorbing material according to claim 1, wherein a cutout for mounting the sound-absorbing material is formed on a rear surface side of the sound-absorbing material in accordance with a curved shape of a mounting portion.