JPH0546404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to improvements in compaction machines used for soil compaction, and particularly to compaction machines that can significantly reduce the noise generated from the compaction machines.

<Conventional technology> Traditionally, a pressure machine known as a tamping rammer produces noise due to the overlap of the noise of the prime mover (engine) in addition to the impact sound of the pressure plate striking the ground.
When used for work in urban areas, especially at night, they are subject to noise pollution. For this reason, conventionally the upper half of the aircraft, such as the engine and transmission mechanism, was
The noise of the compression machine (particularly the prime mover) was reduced by covering the fastener with a bag-like soundproof cover made of cloth or the like that could be opened and closed as needed (Utility Model Publication No. 60-4607).

<Problems to be Solved by the Invention> However, in the case of such conventional technology, there is a problem that the cloth forming the soundproof cover is not very good in soundproofing and insulation properties, or the lower end of the soundproof cover and the legs of the aircraft There have been cases in which noise has not been sufficiently reduced due to reasons such as not being in complete contact with the soundproof cover and noise leaking from below the soundproof cover.

The present invention has been made with attention to such conventional technology, and it is an object of the present invention to provide a compressor that can sufficiently reduce the noise from the prime mover.

<Means for Solving the Problems> In order to achieve the above object, the compression machine according to the present invention includes a power transmission mechanism section that converts rotational motion into reciprocating motion, a handle provided on the power transmission mechanism section, and a handle provided on the power transmission mechanism section. , a prime mover that is attached to the side of the power transmission mechanism on the handle side and can freely transmit rotational motion to the power transmission mechanism, and has a muffler protruding from the bottom;
A pressure machine comprising: a leg provided below a power transmission mechanism and having a pressure plate at the lowest end;
The prime mover is arranged between the prime mover and the power transmission mechanism, and includes a two-part rear cover in which a notch is formed in the mating portion to allow the connection between the prime mover and the power transmission mechanism to pass through. a front cover disposed on the handle side facing the rear cover and having a corresponding shape substantially the same as the rear cover;
a two-part lower cover that connects the lower ends of the rear cover and the front cover and has a notch formed in the mating part to allow the muffler to pass through; a cover frame comprising at least the rear cover of the cover frame; It has a band shape large enough to cover the maintenance opening formed between the front cover and the entire cover frame with attachment means provided between the side ends of both covers. The cover frame is covered with a box-shaped cover consisting of a removable cover sheet, and a sound-absorbing layer is applied to the inner surface of the cover frame, and the cover sheet is covered with a box-shaped cover consisting of a sound-absorbing layer, a sound-insulating layer, and an exterior sheet layer. It has a layered structure.

<Function> It is covered with a box-shaped cover composed of a cover frame with a sound-absorbing layer on the inner surface, and a three-layer cover sheet consisting of a sound-absorbing layer, a sound-insulating layer, and an exterior sheet layer.
Compared to conventional soundproof covers made of cloth, etc., the noise generated from the prime mover can be contained more reliably. Further, since the cover sheet is detachable from the cover frame, it is suitable for maintenance of the prime mover.

<Example> A preferred example of the present invention will be described below with reference to FIGS. 1 to 5.
This will be explained based on the diagram.

The pressure machine according to this embodiment mainly includes an engine (prime mover) 1, a power transmission mechanism 2, legs 3, and a pressure plate 4. The engine 1 is provided on the operator's side of the power transmission mechanism 2, that is, on the side in the direction in which the handle 5 protrudes.

This engine 1 has a cover frame 6
and a cover sheet 7. The cover frame 6 includes a rear cover 9 divided into left and right halves provided between the engine 1 and the power transmission mechanism section 2, and a substantially circular notch for protruding an air introduction fan section 10 for cooling the engine 1. 11, a lower cover 13 that is divided into two parts in the front and rear, which connects the lower ends of the rear cover 9 and the front cover 12, and an upper connection that connects the upper ends of the rear cover 9 and the front cover 12. It is constructed by assembling the members 14 and 14 together. A glass wool layer 15 as a "sound absorbing layer" is entirely applied to the inner surface of each of the rear cover 9, front cover 12, and bottom cover 13. In addition, each flange portion 9a, 1 as a “side end portion” of the rear cover 9 and the front cover 12 is
A strip-shaped magic fastener 30 serving as an "attachment means" is attached to the surface of 2a. Note that a rock wool layer may be provided as the "sound absorbing layer" instead of the glass wool layer 15. In addition, the rear cover 9
And the bottom cover 13 has a notch 16 for passing the connecting part between the engine 1 and the power transmission mechanism part 2 and a connecting pipe 18 of the muffler 17 at the joint part when the divided parts are assembled. A notch 19 is formed in each case. Furthermore, a heat exhaust cover 21 equipped with heat exhaust ports 20 that open toward both left and right sides is attached to the left and right upper portions of the rear cover 9, and a large number of A small hole 22 is formed. Furthermore, this large number of small holes 2
The total opening area of the exhaust heat cover 21 is set to be larger than the total opening area of the air introduction holes (not shown) formed in the air introduction fan section 10 of the engine 1 described above. The heated air is smoothly discharged from the heat exhaust cover 21 without being trapped inside the box-shaped cover 8. Further, a fixing part 24 with a notch 23 is further attached below the exhaust heat cover 21 in the rear cover 9, and the power transmission mechanism part 24 is attached to the rear cover 9.
The protrusions 25 protruding to the left and right can be fixed with insertion bolts during assembly.

Cover frame 6 assembled to engine 1
Although the front, rear, and lower parts of the engine 1 are covered by a front cover 12, a rear cover 9, and a lower cover 13, respectively, the sides thereof are open parts for maintenance of the engine 1. In order to cover the open portion, a cover sheet 7 is removably wrapped around the side of the cover frame 6. The cover sheet 7 has a notch 26 at one end for passing the connecting pipe 18 of the muffler 17, and a roughly rectangular notch 28 for protruding the air cleaner 27 of the engine 1 at the inner side. It has a rectangular shape. At both ends of the cover sheet 7, so-called "magic fasteners" 29 which can be freely adhered to each other are provided in order to maintain (fix) the wrapped state around the cover frame 6. Furthermore, the cover sheet 7 has the aforementioned flange portions 9.
Magic fasteners 41 are provided along both side edges 32 of the cover sheet 7 as "attachment means" which can be freely adhered to the strip-shaped magic fasteners 30 attached to the surfaces of the cover sheets 7a and 12a. Also,
A rectangular notch 28 formed in the cover sheet 7 is provided with a magic fastener (not shown) for polymerization.
A separable separation portion 31 is formed.
Furthermore, a notch 33 is also formed at the corner of the notch 28 for guiding various cords of the engine 1 to the outside.

This cover sheet 7 is made up of three laminated layers from the back side: a rock wool layer 34 as a "sound absorbing layer", a high specific gravity resin sheet layer 35 as a "sound insulating layer", and a resin sheet layer 36 for tents as an "exterior sheet layer". It has a layered structure (see Figure 4). The rock wool layer 34 has a specific gravity of 0.2 and a thickness of 4.0.
mm, and the resin sheet layer 35 has a specific gravity of
2.3 and the thickness is 1.0mm. However, these numerical values may be changed within a certain range as necessary. Further, the resin sheet layer 36 for the tent, which serves as the "exterior sheet layer", is folded back and sewn at the outer periphery of the cover sheet 7. In addition, this cover sheet 7
Sewn portions 7a are formed as "bending lines" at positions corresponding to corners 6a of the cover frame 6 so that the cover frame 6 can be wrapped accurately along the shape of the cover frame 6. Furthermore, a fireproof sheet 37 is sewn onto the inner surface of the other end of the cover sheet 7.
That is, since this part is the part closest to the engine 1, the fireproof sheet 37 is provided to prevent the cover sheet 7 from succumbing to the heat of the engine 1.

Next, the pressure plate 4 according to this embodiment is made of urethane. This urethane pressure plate 4
Although it has enough rigidity to hit the ground, it is not as hard as conventional steel, so the impact noise from hitting the ground is very low. Furthermore, the muffler 17 in this embodiment is a specially large and high-performance muffler that protrudes below the engine 1 via a connecting pipe 18.

Next, the operation will be explained.

When attaching the cover sheet 7 to the cover frame 6, first, the separation section 31 is opened and the air cleaner 27 of the engine 1 is inserted into the notch section 28 from there. Then, while folding the cover sheet 7 at the sewn portion 7a, the band-shaped magic fasteners 41 on the side edges 32 of the cover sheet 7 are attached to the respective flanges 9a and 12a of the rear cover 9 and the front cover 12 in advance. 30 and then wrap it around the cover frame 6 in order, and finally, the magic fasteners 29 at both ends are glued together to complete the installation. The box-shaped cover 8 constituted by the cover sheet 7 and the cover frame 6 attached in this manner covers the entire outer surface of the engine 1, so that the noise generated from the engine 1 does not leak outside. In other words, compared to conventional soundproof covers made of cloth or the like, the glass wool layer 15 provided on the inner surface of the cover frame 6 and the three-layered cover sheet 7 can more reliably prevent the noise from the engine 1 from leaking. I can do it. Therefore, when we actually measured the noise around the compressor during operation, we found that there was a difference of about 10 horns in noise between when it was covered with the box-shaped cover 8 and when it was not covered. Here, there was a concern that noise would leak along with hot air from the small holes 22 for exhaust heat in the heat exhaust cover 21, but since the heat exhaust ports 20 face both left and right sides, the small The slight noise leaking from the hole 22 collides with the heat exhaust cover 21, then turns 90 degrees and is discharged from the heat exhaust port 20 along with the hot air, so by the time it goes outside, it has already been considerably reduced and weakened. It is in a state of

Furthermore, in the case of this embodiment, since the pressure plate 4 is made of urethane, there is very little impact noise when hitting the ground, and since the muffler 17 of the engine 1 is specially made large and has high performance, the box-shaped In addition to the soundproofing effect provided by the cover 8, it is possible to comprehensively reduce the noise generated by the compressor.

FIG. 6 is a diagram showing another embodiment of the invention. In this embodiment, a base plate 39 made of iron is provided at the lower end of the leg portion 38, and a pressure plate 40 made of urethane is attached to the lower surface of this base plate 39. Therefore, this base plate 39 allows the urethane pressure plate 4 to be
Since zero deflection is completely regulated, the striking force transmitted from the legs 38 can be applied to the ground more effectively. Other configurations and effects are the same as those of the previous embodiment, and redundant explanation will be omitted.

In addition, in the description of the above embodiment, the pressure plate 4,
Although an example has been shown in which the material 40 is made of urethane, other resins may be used as long as they have sufficient rigidity to pound the ground. Further, the shape of the box-shaped cover 8 is not limited to that of the embodiment, and the shape of the motor to be covered and
An appropriate one can be adopted depending on the size.

<Effects of the Invention> The compression machine according to the present invention has the content as described above, and the prime mover of the compression machine is composed of a cover frame having a sound absorption layer on the inner surface, a sound absorption layer, a sound insulation layer, and an exterior. Since it is covered with a box-shaped cover made of a three-layer structure cover sheet, noise generated from the prime mover can be contained more reliably than conventional soundproof covers made of cloth or the like. Further, since the cover sheet is detachable from the cover frame, it is suitable for maintenance of the prime mover.

Further, according to the embodiment of the present invention, the muffler of the prime mover is made larger and has higher performance and is placed outside the box-shaped cover, which makes it possible to further reduce engine noise and make the box-shaped cover more compact. Since the pressure plate is made of resin, the impact noise generated when striking the ground can be extremely reduced, making it possible to achieve overall noise reduction of the pressure machine.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a box-shaped cover according to an embodiment of the present invention, and FIG. 2 is a partially cutaway side view showing a state in which the cover sheet of the compressor according to an embodiment of the present invention is removed. , FIG. 3 is an exploded perspective view showing the cover frame, FIG. 4 is a plan view showing the back side of the cover sheet, FIG. 5 is a cross-sectional view taken along the arrow line in FIG. FIG. 7 is a sectional view of a pressure plate showing another embodiment of the invention. 1... Engine (prime mover), 2... Power transmission mechanism part, 3, 38... Leg part, 4, 40... Load pressure plate,
6...Cover frame, 7...Cover sheet, 8
... Box-shaped cover, 15 ... Glass wool layer (sound absorption layer), 17 ... Muffler, 34 ... Rock wool layer (sound absorption layer), 35 ... Resin sheet layer (sound insulation layer),
36...Resin sheet layer (exterior sheet layer).

Claims (1)

[Scope of Claims] 1. A power transmission mechanism that converts rotational motion into reciprocating motion, a handle provided on the power transmission mechanism,
a prime mover which is attached to the side of the power transmission mechanism on the handle side and is capable of freely transmitting rotational motion to the power transmission mechanism and has a muffler protruding from the bottom thereof; and a leg portion having a pressure plate on the side, wherein the prime mover is arranged between the prime mover and the power transmission mechanism, and has a cutout portion through which a connecting portion between the prime mover and the power transmission mechanism passes. a two-part rear cover formed at the mating portion; a front cover disposed on the handle side of the prime mover facing the rear cover and having a corresponding shape substantially the same as the rear cover; and the rear cover and the front cover. a cover frame comprising: a two-part lower cover in which a notch is formed in the mating part to connect the lower ends of the covers and allow the muffler to pass through; and at least between the rear cover and the front cover of the cover frame. The cover has a band shape large enough to cover an open part for maintenance formed in the cover, and the entire cover can be attached to and detached from the cover frame by means of attachment means provided between the side ends of the covers. a box-shaped cover consisting of a cover sheet, and a sound-absorbing layer is applied to the inner surface of the cover frame, and the cover sheet has a three-layer structure of a sound-absorbing layer, a heat-insulating layer, and an exterior sheet layer. A compression machine characterized by: