JPH0710010U - Vibration plate - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vibration plate that dramatically reduces noise without losing its original function. [Structure] A vibration damping steel plate (9) is attached to at least both sides and a central portion of the vibration plate (1) with a required gap between the vibration plate (1) and an upper surface of the vibration plate (1), and a continuous hammering force application object such as a roadbed The noise is reduced by absorbing the noise caused by repeated striking with the damping steel plate (9).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration plate used for compacting roadbeds, roadbeds, etc. for burying gas, water and sewage, electricity, and communication lines, as well as compacting asphalt pavement, and other constructions.

[0002]

[Prior art]

 A device called a vibration plate is used for compacting pavement and the like. This is done by having a flat vibration plate and transmitting vibrations from the vibration source to this vibration plate so that the road surface is hit repeatedly. Furthermore, the vibration plate will be described in detail. A vibrating body is provided on the upper part of the vibration plate, and the vibrating body is driven by an engine arranged above the vibration plate via an engine base. Then, the worker moves the vibration plate on the road surface and strongly hits the road surface repeatedly to compact the pavement.

[0003]

[Problems to be solved by the device]

 However, since the above vibration plate generates a lot of noise during the work, it is a big problem to take measures against the noise around the work site. This noise is unavoidable due to the vibration plate structure, but when the noise was measured during operation of the existing asphalt surface, a measured value of 92.5 dB was shown at a distance of 7 m. This noise is caused by the structure of the driven vibrating body generating a strong impact force by rotating the vibrating shaft attached with the pendulum, and transmitting this impact force to the front part of the diaphragm. Because it is designed to be converted into continuous hitting force.

For this reason, conventionally, proposals have been made to improve the structure of the vibrating body and the structure of the engine to be mounted, but there is a limit to the reduction of noise due to vibration. In addition, improvement proposals have been proposed in which the material of the diaphragm is changed or the method of transmitting the impact force to the diaphragm is changed, but these can reduce the noise to some extent, but the striking force becomes weak. However, the moving frictional force of the vibration plate becomes large, which causes new problems such as lowering work efficiency.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a vibration plate that dramatically reduces noise without losing the essential function of the vibration plate. It is a thing.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention transmits vibration to a diaphragm having a grounding surface from an exciter provided on the diaphragm to compact the roadbed, roadbed or asphalt pavement. In the vibration plate, damping steel plates are attached to at least both sides and the center of the vibration plate with a required gap between the vibration plate and the upper surface of the vibration plate. In addition, when mounting the damping steel plate with a required gap between it and the upper surface of the diaphragm, a plurality of gaps are formed in the direction of the diaphragm surface, and the vibration plate is attached to each of the gaps. did. Further, as the vibration damping steel plate, a vibration plate using a plate material in which a viscoelastic resin is interposed between two steel plates is used.

[0007]

[Action]

 In this way, the damping steel plate is attached to at least both sides and the central part of the diaphragm with a required gap between the diaphragm and the upper surface of the diaphragm. The noise caused by the continuous friction of is absorbed by the damping steel plate, and the noise can be significantly reduced.

[0008]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall perspective view of a vibration plate according to the present invention. A vibrating body (not shown) covered with the cover 2 is provided on the front portion of the upper surface of the diaphragm 1. The reason why the vibrating body is positioned at the front part of the upper surface of the diaphragm 1 is that it is most effective for moving the vibration plate while applying continuous hammering force to the object for continuously hammering force such as the roadbed. . That is, the vibrating body can apply a continuous striking force in the vertical direction to a continuous striking force application target such as a roadbed through the diaphragm 1, and can also impart a forward force to the diaphragm 1.

The vibrating body receives a driving force of an engine, which will be described later, via the V-belt 3 and drives the vibrating body. Explaining further about the vibrating body, when the driving force of the engine is received, the vibrating shaft rotates, and the pendulum attached to the vibrating shaft causes the vibrating shaft to eccentrically rotate, thereby causing vibration. Various concrete structures such as a vibrating shaft and a pendulum are conceivable, and any known various vibrating body may be arbitrarily selected and used. An engine base 4 is provided substantially in the center of the diaphragm 1, and an engine 5 is mounted on the engine base 4. The operator performs the compaction work such as pavement by pushing the vibration plate configured in this way through the handle 6.

FIG. 2 is a plan view of the diaphragm 1. As shown in the figure, vibration dampers 7a, 7b, 7c are provided on both sides and the center of the diaphragm 1. The vibration dampers 7a and 7b on both sides of the vibration plate 1 are provided on the upper surface of the vibration plate 1, and the vibration damper 7c at the center is provided inside the top of the engine base 4. In addition, it is desirable that the vibration damper is provided in a wide range on the upper surface of the diaphragm 1. Each damping device has a protective iron plate and a damping steel plate described later, and the damping steel plate is provided while forming a required space between it and the upper surface of the diaphragm 1 as described later. Next, how to attach the damping steel plate will be described.

First, FIG. 3A is a cross-sectional view showing a state in which one damping member 7 a is entirely used as one gap and a damping steel plate 9 is attached. The vibration damper 7a is provided so that the protective iron plate 8 stands up on the vibration plate 1, and the vibration damping steel plate 9 attached inside is hermetically covered so that it cannot be observed from the surface. The airtight coating is to prevent the vibration-damping steel plate 9 from being damaged by various oil splashes during compaction work on a roadbed, a roadbed, an asphalt pavement, or the like. Next, FIG. 3B shows an embodiment in which partition walls 8a and 8b are provided integrally with the protective iron plate 8 so as to form a plurality of (three in the drawing) gap portions 11a to 11c in one vibration damping device 7a. FIG. This embodiment has the same effects as the embodiment of FIG. 3A, and can further improve the noise reduction effect. In any of the embodiments, the damping steel plate 9 is fixed to the inside of the protective iron plate 8 with an adhesive and bolts 10 as shown in the drawing, and a space 11 is formed between the vibration damping steel plate 9 and the upper surface of the vibration plate 1. The central vibration damper 7c (FIG. 2) is also provided inside the engine base 4, and a space is formed between the vibration damper 1c and the upper surface of the vibration plate 1.

As the above-mentioned adhesive, a rubber-based adhesive or a durable adhesive may be arbitrarily selected and used. However, it goes without saying that fixing stability and adhesion of the vibration damping steel plate 9 are further improved by using the adhesive and fixing it with the bolt 10. Fixing the vibration damping steel plate 9 by welding is not appropriate because it damages the viscoelastic resin of the vibration damping steel plate 9.

Next, the damping steel plate 9 used in the present invention will be described. The vibration-damping steel plate 9 is formed by sandwiching a viscoelastic resin having a thickness of approximately 50 μm between two steel plates (mild steel, 3.2 mm thick), and the vibration energy due to shear deformation of the viscoelastic resin due to bending vibration. It is designed to generate a vibration damping effect by converting heat into heat energy. The thickness of the vibration plate 1 provided with the vibration damping steel plate 9 is usually about 6 to 9 mm. Needless to say, the present invention is not limited to the above-mentioned vibration-damping steel plate 9, and component members other than the steel plate may be selectively used as long as they have a vibration damping effect.

FIG. 4 shows an example of an improper installation of the vibration damping steel plate 9 for comparison with the configuration of the present invention shown in FIG. Of these, FIG. 4A shows that when the vibration damping steel plate 9 is attached between the vibration plate 1 and the protective iron plate 8, the upper and lower surfaces of the vibration damping steel plate 9 are used as joint surfaces and the lower surface of the vibration damping steel plate 9 and the upper surface of the vibration plate 1 are connected. No space is formed between them. The bonding with the adhesive is performed on both the upper and lower sides of the vibration damping steel plate 9. Further, FIG. 4B shows that the vibration damping steel plate 9 is joined to the upper surface of the vibration plate 1 to form a space between the lower surface of the protective iron plate 8 and the upper surface of the vibration damping steel plate 9. The bonding with the adhesive is performed on the lower surface of the damping steel plate 9. Further, FIG. 4C shows an example in which a plurality of damping steel plates 9 are joined to the upper surface of the diaphragm 1 and no protective iron plate is provided. The bonding with the adhesive is performed not only on the lower surface of the damping steel plate 9 but also by the bolt 10. Further, FIG. 4D shows an example in which the damping steel plate 9 is joined to the entire lower surface of the diaphragm 1 and the protective iron plate is not provided.

Then, when the bottom plate of the diaphragm 1 according to the present invention shown in FIG. 3 is hit with a hammer and measured by a noise indicator installed at a position 3 m away, it is compared with the conventional one. The value indicated by the noise indicator was low. Also, as shown in FIGS. 4A-C, the diaphragm 1 provided with the damping steel plate 9 also had a low value indicated by the noise indicator. However, the structure according to the present invention in which the space 11 is formed between the upper surface of the vibration plate 1 and the damping steel plate 9 is more effective than the structure shown in FIGS. 4A to 4C. It was proved as a result of the experiment that it was. Further, the one shown in FIG. 4D produced an effect comparable to that of the configuration of the present invention, but since it was not covered by the protective iron plate, the damping steel plate 9 was damaged by the splashed oil. Since it is loose and directly receives heat from heat synthesis (asphalt), it has poor durability and cannot be used in an actual configuration.

Next, noise measurement when the vibration plate according to the present invention shown in FIG. 1 is actually operated will be described. In this experiment, the existing asphalt surface was compacted and the measuring device was installed at a position about 7 m away from the sound source. Then, in the conventional vibration plate, the noise level was 92.5 dB, but in the vibration plate of the present invention shown in FIG. 3A, the noise was dramatically reduced to 85.5 dB. According to the sense of the workers on site, the measured value was lower than the noise from the diaphragm 1 by the engine sound of the vibration plate. In addition, the harsh sound quality has also been improved to a relatively gentle sound quality of low frequencies.

[0017]

[Effect of device]

 As described above, according to the present invention, the damping steel plate is attached to at least both sides and the central portion of the vibration plate with a required gap between the vibration plate and the upper surface of the vibration plate. The noise caused by repeated striking friction with the force application target is absorbed by the vibration damping steel plate, and the noise can be significantly reduced. In addition, the damping steel plate is sealed by the protective iron plate, so it is possible to prevent oil from seeping in during work. Further, since the damping steel plate is provided with a required gap between the vibration damping steel plate and the upper surface of the vibration plate, it is possible to prevent the vibration plate from directly receiving heat from the vibration plate. Therefore, the vibration-damping steel plate is hardly damaged and durability problems do not occur.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a vibration plate according to the present invention.

FIG. 2 is a plan view of the same diaphragm.

FIG. 3 is a sectional view showing a mounting state of the vibration damping steel plate.

FIG. 4 is a sectional view showing another mounting state of the damping steel plate for comparison with the present invention.

[Explanation of symbols]

 1 Vibration Plate 7 Damper 8 Protective Iron Plate 9 Damping Steel Plate 10 Bolt 11 Space

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazunori Kurumada 3-23-14 Takanawa, Minato-ku, Tokyo Inside Nippon Comsys Co., Ltd. (72) Inventor Hitoshi Yamaguchi 4-18-3 Omorihigashi, Ota-ku, Tokyo Stock Company Santo

Claims (3)

[Scope of utility model registration request] 1. A vibration plate for compacting a roadbed, a roadbed, an asphalt pavement, etc. by transmitting vibrations from a vibrating body provided on the vibration plate to a vibration plate having a grounding surface. A vibration plate, characterized in that a damping steel plate is attached to at least both side portions and a central portion of the plate through a required gap between the vibration plate and an upper surface thereof. 2. When mounting the vibration damping steel plate with a required gap between the vibration plate and the upper surface of the vibration plate, a plurality of gaps are formed in the vibration plate surface direction, and the vibration damping steel plate is attached to each of the gaps. The vibration plate according to claim 1, wherein: 3. The vibration plate according to claim 1, wherein a plate material obtained by interposing a viscoelastic resin between two steel plates is used as the vibration damping steel plate.