JP2006161492A - Vibration control device for handheld construction machinery, and soil tamping equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device for handheld construction machinery, which can greatly reduce vibrations on the hand side of a handle, without requiring any change in the structure of the handheld construction machinery such as existing soil tamping equipment. <P>SOLUTION: A mass member 9, which is composed of a plurality of small metallic balls 8, is movably housed in a housing 7 which is fixed to the handheld construction machinery, and an inner surface of the housing 7 is covered with an elastic body 10. Since the plurality of small metallic balls 8 collide with the inner surface of the housing 7 so that the vibrations can be damped, the transmission of the vibrations to an operator's hands can be reduced. The elastic body 10 on the inner surface of the housing 7 can prevent an unusual noise from being generated by the collision of the small metallic balls 8 with the inner surface of the housing 7, and can also bring about cushioning against contact reaction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a soil compaction device, a vibration damping device applied to other hand-held construction machines, and a soil compaction device including the vibration damping device.

  As a soil tamping device, for example, as shown in FIG. 7, a built-in drive device 20 that performs a substantially vertical vibration and a guide handle 21 are provided, and the guide handle 21 can be pivoted around a pivot point 22. The grip handle 21 a is provided at one end of the guide handle 21 to be held by an operator, and the other end of the guide handle 21 extends beyond the pivot point 22. In the soil tamping device provided with an extending portion 21b that extends, the pivot point 22 has a virtual perpendicular L that extends from the grip portion 21a to the longitudinal axis A of the tamping device body. The guide handle 21 may be arranged above or the pivot point 22 as a virtual branch point so that the guide handle 21 satisfies a predetermined mass distribution formula (see Patent Document 1).

  Further, as a soil tamping device, as shown in FIG. 8, in the soil tamping device in which handle members 30 are attached to both side portions of the main body 32 via the cushioning material 31, at least two on each side portion of the main body 32. There is also one in which vibrations of the main body 32 transmitted to the operator holding the handle member 30 are reduced by arranging the two buffer materials 31a and 31b at a predetermined interval (see Patent Document 2).

Japanese Patent No. 2949475 JP-A-10-298913

  However, in the soil tamping device, the pivot point 22 of the guide handle 21 is disposed above the virtual perpendicular L extending from the grip portion 21a to the longitudinal axis A of the tamping device body, or pivot point. Since the guide handle 21 satisfies the predetermined mass distribution formula with the virtual branch point 22 as the virtual branch point, it is necessary to greatly change the structure of the existing soil compaction device, and the fuel tank 24 is used as a mass member. Therefore, there is a problem that the amount of oil supply due to shaking is not constant, and the soil compaction function is deteriorated and the work efficiency is likely to be reduced.

  Also in the above-described soil tamping device in which at least two buffer materials 31 attached to both sides of the main body 32 of the soil tamping device are provided on each side and arranged at predetermined intervals, the buffer material 31a, In order to arrange at least two 31b on each side of the main body 32 at a predetermined interval, a large structural change must be made, and the center of gravity of the device itself and the elastic center of the cushioning materials 31a, 31b can be matched. Difficult, the rotational rigidity due to the arrangement of the cushioning materials 31a and 31b is increased, and the vibration in that direction is reduced, but the shear deformation is increased by that amount, so that there is a problem that it is not preferable for vibration control on the handle side. is there. This is because the current soil compaction device has a greater vertical vibration than the front and rear vibrations and the left and right vibrations.

  The present invention has been made to solve such a problem, and the object of the present invention is to eliminate the need to change the structure of a hand-held construction machine such as an existing soil compaction device at the handle side. It is an object of the present invention to provide a handheld construction machine vibration damping device and a soil compaction device that can significantly reduce vibration.

To achieve the above object, a vibration damping device for a hand-held construction machine according to claim 1 of the present invention has a mass member composed of a plurality of small metal balls in a housing fixed to the hand-held construction machine. The housing is movably accommodated and is characterized in that the inner surface of the housing is covered with an elastic body.
According to this vibration damping device, when the hand-held construction machine vibrates, the vibration damping device also vibrates along with this vibration. However, when the vibration damping device vibrates, a plurality of small metal balls move relative to the housing. As a result, the metal sphere collides with the inner surface of the housing, and the vibration is attenuated by the energy loss caused by the collision, so that it is possible to reduce the transmission to the operator's hand. In addition, since the inner surface of the housing is covered with an elastic body, it is possible to absorb and reduce abnormal noise generated when the metal sphere collides with the housing, and to buffer the contact reaction force of the metal sphere. .

The vibration damping device for a hand-held construction machine according to claim 2 movably accommodates a mass member composed of a plurality of small metal balls in a housing fixed to the hand-held construction machine. It is characterized in that the surface of the sphere is covered with an elastic body.
Even in this case, the vibration generated from the hand-held construction machine is attenuated by the collision of the plurality of small metal balls with the inner surface of the housing, so that the transmission to the hand of the operator can be reduced. In addition, since the surface of the metal spheres is covered with an elastic body, it can absorb and reduce abnormal noise generated by contact of the metal spheres with the inner surface of the housing or between the metal spheres, and also buffer the contact reaction force. You can also

The hand-held construction machine vibration damping device according to claim 3 is the hand-held construction machine vibration damping device according to claim 1 or 2, wherein the mass member is composed of a plurality of types of metal spheres having different masses. It is what has. In this case, the plurality of types of metal spheres having different masses include those having different materials and those having the same material and different sizes.
According to this, a small vibration can be reduced with a small metal sphere, and a large vibration can be reduced with a large metal sphere, and the frequency range in which vibration can be reduced can be widened.

The hand-held construction machine vibration damping device according to claim 4 is the hand-held construction machine vibration damping device according to claim 3, wherein the interior of the housing is partitioned into a plurality of chambers, and each chamber has a plurality of types having different masses. It is characterized in that metal spheres are accommodated for each type.
According to this, since a plurality of types of metal spheres having different masses are not mixed by movement, it is possible to effectively exhibit the vibration damping action according to a wide frequency range.

The soil compaction device according to claim 5 is a soil compaction device in which a handle is attached to the device main body. It is characterized by having a vibration damping device.
According to this soil tamping device, the vibration generated from the device main body is attenuated by the collision of the plurality of small metal balls with the inner surface of the housing, so that it is possible to reduce the transmission to the hand of the operator holding the handle.

  According to the present invention, vibration is attenuated by the collision of a plurality of metal spheres with the inner surface of the housing, so that it is possible to reduce the transmission to the operator's hand, and the existing soil compaction device or the like can be held by hand. There is an advantage that it can be implemented by simple means of simply fixing the housing at a predetermined position such as a handle of the machine without any special change to the structure of the construction machine.

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a side view of a soil compaction device as an example of a hand-held construction machine, FIG. 2 is a plan view of the soil compaction device of FIG. 1, and FIG. 3 is a vibration control device provided in the soil compaction device of FIG. It is a vertical side view.

  1 and 2, reference numeral 1 denotes a soil compaction device. The structure of the soil compaction device 1 itself is the same as that of a well-known standard type, and a handle 3 is pivotally supported on the upper part of the device main body 2. A pressing plate 4 is attached to the lower end of the apparatus body 2. Reference numeral 5 denotes a vibration damping device according to the present invention. Both ends of the grip portion 3a on the proximal side longer than the pivot portion 6 of the handle 3 (see the solid line state in FIG. 2) or near the center (in FIG. 2, the two-dot chain line state) In addition, it is provided in the vicinity of the grip portion 3a.

  As shown in FIG. 3, the vibration damping device 5 allows a mass member 9 composed of a plurality of small metal balls 8 such as a plurality of steel balls to be moved in a housing 7 having a cylindrical shape, an elliptical cylindrical shape, or a polygonal cylindrical shape. Contained. The inner surface of the housing 7 is covered with an elastic body 10 made of synthetic rubber such as natural rubber or urethane rubber. A viscous material such as air or silicone oil is enclosed in the internal space of the housing 7.

  If the housing 7 of the vibration damping device 5 configured in this way is provided on the hand side of the handle 3, the vibration generated from the soil compaction device 1 causes the plurality of small metal balls 8 to collide with the inner surface of the housing 7. Therefore, unpleasant vibration transmitted to the hand of the worker holding the handle 3 can be reduced. Further, since the inner surface of the housing 7 is covered with the elastic body 10, it is possible to prevent the generation of noise due to the metal small spheres 8 colliding with the inner surface of the housing 7, and to buffer the contact reaction force.

  As described above, the rubber-like elastic body 10 is coated on the inner surface of the housing 7 in order to eliminate the generation of abnormal noise due to the contact of the metal spheres 8 and to exert a buffering action of the contact reaction force. As described above, the same elastic body 10 may be coated on each of the metal spheres 8. In this case, the inner surface of the housing 7 may be covered with the elastic body 10 or may not be covered.

  As the mass member 9, instead of the plurality of small metal balls 8 having the same mass, as shown in FIG. 5, the mass of the same material having different sizes or different materials is used. It may be different. Rather, by using a plurality of types of metal spheres 8 having different masses in this way, small vibrations can be damped by the small metal spheres 8 having a smaller mass and large vibrations can be damped by the small metal spheres 8 having a large mass. This is advantageous in that vibration can be effectively damped in the frequency range.

In this case, as shown in FIG. 6, the inside of the housing 7 is partitioned into a plurality of chambers 12, 13, 14... By a partition wall 11, and each chamber 12, 13, 14. The metal spheres 8 can be accommodated for each type. The inner surface of each chamber 12, 13, 14... And / or each metal ball 8 is covered with a rubber-like elastic body 10.
According to this, since a plurality of kinds of metal spheres 8 having different masses are not mixed by moving in the housing 7, it is possible to effectively exhibit a vibration damping action in a wide frequency range.

  The vibration damping device 5 can be similarly applied to a hand-held construction machine other than a soil compaction device.

It is a side view of the soil tamping apparatus which shows one Example of this invention. It is a top view of the soil tamping apparatus of FIG. It is a vertical side view of the vibration damping device attached to the soil compaction device of FIG. It is a vertical side view which shows the damping device of another Example corresponding to FIG. FIG. 6 is a longitudinal side view showing a vibration damping device of still another embodiment corresponding to FIG. 3. Furthermore, it is the vertical side view which shows the damping device of another Example corresponding to FIG. It is a partial cross section side view of the soil tamping apparatus of a prior art example. It is a perspective view of the soil tamping apparatus of another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Soil compaction apparatus 2 Apparatus main body 3 Handle 5 Damping apparatus 7 Housing 8 Metal ball 9 Mass member 10 Elastic body 12, 13, 14 Multiple chambers

Claims (5)

  A hand-held construction machine is characterized in that a mass member made of a plurality of small metal balls is movably accommodated in a housing fixed to a hand-held construction machine, and an inner surface of the housing is covered with an elastic body. Damping device for construction machinery.   A mass member made of a plurality of small metal balls is movably accommodated in a housing fixed to a hand-held construction machine, and an elastic body is coated on the surface of the small metal balls. , Vibration control device for hand-held construction machinery.   The vibration damping device for a hand-held construction machine according to claim 1 or 2, wherein the mass member is composed of a plurality of types of metal spheres having different masses.   The hand-held construction machine vibration damping device according to claim 3, wherein the interior of the housing is partitioned into a plurality of chambers, and a plurality of types of metal balls having different masses are accommodated in each chamber. In a soil compaction device in which a handle is attached to the device main body, the hand-held construction machine vibration damping device according to any one of claims 1 to 4 is provided on a hand side of the handle. A soil compaction device.

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