JP5865686B2 - Vibration control device and outdoor work machine - Google Patents

Description

  The present invention relates to a vibration damping device that suppresses vibration of an object and an outdoor work machine provided with the vibration damping device.

  Conventionally, as an example of a vibration damping device, there is one that is attached to a building structure and attenuates horizontal vibration (so-called TMD: Tuned Mass Dumper).

  When this TMD is applied, the natural frequency of the building is estimated in advance, and tuning such as matching the natural frequency of the TMD or selecting the closest natural frequency is performed accordingly. Patent Document 1).

JP 2005-188272 A

  For example, an outdoor work machine used in a demolition site such as a building generates vertical vibrations during operations such as pulverizing concrete at the demolition site.

  The vibration damping device provided in the building structure is a structure that suppresses horizontal shaking of the object, and cannot suppress vertical vibration generated in the outdoor work machine.

  Further, when a plurality of masses (weights) are arranged in the vertical direction as a vibration control device provided in the outdoor work machine, there is a problem that the device becomes large and difficult to install in a limited space.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a vibration damping device and an outdoor work machine that can obtain a vibration damping effect in the vertical direction in a wide frequency band.

The present invention relates to a vibration damping device that suppresses vibration of an object, a main mass having a predetermined mass, a main spring that connects the main mass to the object, and a sub mass having a mass smaller than the main mass. , and sub-spring coupling the auxiliary mass to the main mass, and a main damper interposed between the main mass and the object, the main mass accommodating recess for accommodating the secondary mass to the primary mass is formed, the sub Submass through-holes that allow the main damper to penetrate the mass are formed, the main damper is arranged on the center line passing through the center of gravity of the main mass and the center of gravity of the submass, and the main mass and the submass vibrate vertically It was.
The present invention is also a vibration damping device that suppresses vibration of an object, a main mass having a predetermined mass, a main spring that connects the main mass to the object, and a sub mass having a mass smaller than the main mass. A secondary spring that connects the secondary mass to the primary mass, a secondary base base coupled to the lower surface of the primary mass, and a secondary support column erected on the secondary base base. A main mass accommodating recess is formed, a sub mass support hole is formed in the sub mass to allow the sub strut to pass through, and a sub spring is formed in a coil shape that penetrates the sub strut, between the sub mass and the sub base base. The main mass and the sub mass vibrate in the vertical direction .

  According to the present invention, the vibration damping device creates a plurality of anti-resonance points by the vibration system of the main mass and the sub mass, and can obtain a vibration damping effect in the vertical direction in a wide frequency band.

  In the vibration control device, the secondary mass is accommodated in the main mass accommodating recess, so that the size of the device can be suppressed from being increased by the secondary mass, and the size can be reduced.

The side view of the outdoor working machine which shows embodiment of this invention. The top view and side view of a damping device similarly. Similarly, sectional drawing of a damping device.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a side view showing a schematic configuration of the outdoor work machine 1. The outdoor work machine 1 is a large machine that performs excavation of civil engineering, pulverization of concrete, and the like.

  The outdoor work machine 1 includes a traveling crawler 2, a cabin 3 provided with a cockpit, a counterweight 7 provided behind the cabin 3, a boom 4, an arm 5 and a bucket 6 that perform excavation work and the like. . The boom 4, the arm 5 and the bucket 6 are each driven by a hydraulic cylinder (not shown).

  The counterweight 7 is a weight for maintaining a balance so that the outdoor work machine 1 does not fall during the work, and has a mass of, for example, about 5000 kg.

  A vibration damping device 10 is installed on the counterweight 7, and the vibration generated by the outdoor work machine 1 during work can be suppressed by the vibration damping device 10.

  2A is a plan view of the vibration damping device 10 as viewed from above, and FIG. 2B is a side view of the vibration damping device 10. FIG. 3 is a cross-sectional view taken along line AA in FIG.

  The vibration damping device 10 includes a main mass 20 having a predetermined mass (for example, 400 to 500 kg), a pair of main springs 30 that connect the main mass 20 to the counterweight 7 (vibration target), and vibration of the main mass 20. Mainly composed of a main damper 40 for damping the main mass 20, a sub mass 50 having a predetermined mass (for example, several hundred kg) smaller than the main mass 20, and a pair of sub springs 60 connecting the sub mass 50 to the main mass 20. A multi-stage parallel TMD is configured that attenuates the vibrations in a wide frequency band (for example, 4.9 to 5.5 Hz).

  A main base table 11 is coupled to the upper surface of the counterweight 7, and a pair of main columns 13 are erected on the upper surface of the main base table 11 via a main mounting seat 12. Each main column 13 is formed in a columnar shape extending in the vertical direction (substantially vertical direction), and its lower end is coupled to the main mounting seat 12.

  The main mass 20 is supported on each main support 13 via a linear ball bearing 71 so as to be movable in the vertical direction. A main mass support hole 23 extending in the vertical direction is formed at both ends of the main mass 20, and a linear ball bearing 71 that supports the main column 13 movably in the axial direction is interposed in the main mass support hole 23.

  2B, a linear guide 72 that movably supports the end face of the main mass 20 may be provided on the main mounting seat 12 as indicated by a two-dot chain line. Thereby, the rigidity of the part which supports main mass 20 so that movement in the up-and-down direction is possible is raised.

  The main spring 30 is formed in a coil shape and penetrates the main support column 13 inside thereof. The main spring 30 is compressed and interposed between the main mounting seat 12 and the main mass 20, and a lower portion thereof is fitted into the hole 12 a of the main mounting seat 12, and an upper portion thereof is a large stepped portion of the main mass support hole 23. Fits into the diameter. The weight of the main mass 20 is supported by the elastic restoring force of the main spring 30, and the main spring 30 is expanded and contracted to vibrate in the vertical direction.

  A flange 13a is formed at the upper end of the main column 13, and a main cushion rubber 15 is provided on the lower surface of the flange 13a. The disc-shaped main cushion rubber 15 is made of a rubber material and has a predetermined thickness. When the main mass 20 is displaced upward beyond a predetermined stroke, the upper surface of the main mass 20 comes into contact with the main cushion rubber 15, and the main cushion rubber 15 is compressed to restrict its displacement.

  The main mass 20 and the sub mass 50 each have a rectangular parallelepiped outer shape. A main mass accommodating recess 21 for accommodating the sub mass 50 is formed in the central portion of the main mass 20. The main mass accommodating recess 21 defines a rectangular parallelepiped space larger than the outer shape of the sub mass 50. The sub mass 50 is accommodated with a gap with respect to the inner wall surface of the main mass accommodating recess 21.

  A sub base base 25 is coupled to the lower surface of the main mass 20, and a pair of sub struts 27 are erected on the upper surface of the sub base base 25 via a sub mounting seat 26. Each sub column 27 is formed in a columnar shape extending in the vertical direction, and its lower end is coupled to the sub mounting seat 26.

  The auxiliary mass 50 is supported by the two auxiliary columns 27 via a linear ball bearing 75 so as to be movable in the vertical direction. Submass 50 has submass support holes 53 extending in the vertical direction at both ends thereof, and each submass support hole 53 is provided with a linear ball bearing 75 that supports the sub strut 27 so as to be movable in the axial direction. The

  The secondary spring 60 is formed in a coil shape and penetrates the secondary support 27 inside thereof. The auxiliary spring 60 is compressed and interposed between the auxiliary mounting seat 26 and the auxiliary mass 50, the lower part thereof is fitted into the hole 26 a of the auxiliary attaching seat 26, and the upper part thereof is a large stepped portion of the auxiliary mass supporting hole 53. Fits into the diameter. The auxiliary mass 50 is supported by the elastic restoring force of the auxiliary spring 60 and vibrates in the vertical direction by expanding and contracting the auxiliary spring 60.

  A secondary cushion rubber 16 is provided on the upper surface of the secondary mass 50. The auxiliary cushion rubber 16 is formed in a disk shape having a predetermined thickness by a rubber material. When the sub mass 50 is displaced upward beyond a predetermined stroke, the upper surface of the sub mass 50 contacts the sub cushion rubber 16, and the sub cushion rubber 16 is compressed to restrict the displacement.

  The secondary mass 50 is formed with a secondary mass through hole 51 through which the main damper 40 penetrates at the center thereof. The main damper 40 passes through the inner wall surface of the sub mass through hole 51 with a gap.

  The main damper 40 includes a cylinder 41 and a piston rod 42 protruding from the cylinder 41, and hydraulic oil filled in the cylinder 41 flows through a damping valve (not shown) as these extend and contract. A damping force that suppresses vibration of the main mass 20 is generated. In the main damper 40, the lower end portion of the cylinder 41 is connected to the main base 11 via the bracket 43, and the upper end portion of the piston rod 42 is connected to the main mass 20 via the bracket 44, so that the main mass 20 moves up and down. Operates in conjunction with expansion and contraction.

  2 and 3, a line O is a center line of the main mass 20 and the sub mass 50 extending in the vertical direction (substantially vertical direction) through the center of gravity of the main mass 20 and the center of gravity of the sub mass 50, respectively.

  The main mass 20 has an outer shape, a main mass accommodating recess 21 and the like that are symmetrically formed with respect to the center line O.

  The auxiliary mass 50 has its outer shape, the auxiliary mass through hole 51 and the like formed symmetrically with respect to the center line O.

  The main damper 40 is disposed so as to extend coaxially with the center line O, and operates to expand and contract on the center line O.

  In the vibration damping device 10, the vibration of the counterweight 7 is input to the main mass 20 via the main spring 30, and the main mass 20 is guided by the main struts 13 to vibrate in the vertical direction. Is input to the sub mass 50 via the sub spring 60, and the sub mass 50 is guided by the sub struts 27 and vibrates naturally in the vertical direction. As the main mass 20 vibrates, the main damper 40 expands and contracts to generate a damping force, and the vibration energy of the main mass 20 is absorbed. When the main mass 20 comes into contact with the main cushion rubber 15, the main cushion rubber 15 expands and contracts to generate a damping force, and the vibration energy of the main mass 20 is absorbed. When the secondary mass 50 comes into contact with the secondary cushion rubber 16 as the secondary mass 50 vibrates, the secondary cushion rubber 16 expands and contracts to generate a damping force, and the vibration energy of the secondary mass 50 is absorbed.

  The vibration damping device 10 gains the mass of the vibration system of the main mass 20 by connecting the sub mass 50 to the main mass 20 via the sub spring 60, and also has a plurality of anti-resonance points by the vibration system of the sub mass 50. The vibration control effect can be obtained in a wide frequency band.

  The mass of the main mass 20, the sub mass 50, the spring force of the main spring 30, the sub spring 60, and the like are arbitrarily set according to the vibration frequency for obtaining the vibration damping effect.

  As described above, in the present embodiment, the vibration damping device 10 suppresses vibration of the object (counterweight 7), and includes the main mass 20 having a predetermined mass and the main mass 20 as the object (counterweight). 7) a main spring 30 connected to the main mass 20, a sub mass 50 having a mass smaller than the main mass 20, and a sub spring 60 connecting the sub mass 50 to the main mass 20, and the sub mass 50 is accommodated in the main mass 20. The main mass accommodating recess 21 is formed, and the main mass 20 and the sub mass 50 are configured to vibrate in the vertical direction.

  Based on the above configuration, the vibration damping device 10 creates a plurality of anti-resonance points by the vibration system of the main mass 20 and the sub mass 50, and a vibration damping effect is obtained in a wide frequency band.

  Since the sub mass 50 is accommodated in the main mass accommodating recess 21, the vibration damping device 10 can be prevented from being enlarged by the sub mass 50 and can be reduced in size.

  In the present embodiment, a main damper 40 interposed between the main mass 20 and an object (counterweight 7) is provided, and a sub mass through hole 51 for penetrating the main damper 40 is formed in the sub mass 50, and the main damper is formed. 40 is arranged on a center line O that passes through the center of gravity of the main mass 20 and the center of gravity of the sub mass 50, respectively.

  Based on the above configuration, the main damper 40 can be disposed on the center line O that passes through the center of gravity of the main mass 20 and the center of gravity of the sub mass 50, and an offset load acts on the main mass 20 and the sub mass 50. Instead, the vibration of the main mass 20 is effectively suppressed by the single main damper 40.

  Since the main damper 40 passes through the sub mass through hole 51 of the sub mass 50 and is accommodated in the main mass accommodating recess 21, it is protected from rain and dust and a smooth operation is maintained.

  In the present embodiment, the main mass 13 is provided with the main column 13 standing on the object (counterweight 7), the main mass 20 is formed with a main mass support hole 23 that penetrates the main column 13, and the main spring 30 is The main column 13 is formed in a coil shape penetrating the main column 13 and is interposed between the main mass 20 and the object (counter weight 7).

  Based on the above configuration, the main strut 13 and the main spring 30 are arranged inside and outside between the main mass 20 and the main base base 11, and the vibration damping device 10 can be reduced in size.

  In the present embodiment, a sub-base base 25 coupled to the lower surface of the main mass 20 and a sub-post 27 standing on the sub-base base 25 are provided, and the sub-mass 50 penetrates the sub-post 27. The mass support hole 53 is formed, and the auxiliary spring 60 is formed in a coil shape that penetrates the auxiliary column 27 and is interposed between the auxiliary mass 50 and the auxiliary base base 25.

  Based on the above configuration, the auxiliary strut 27 and the auxiliary spring 60 are housed between the auxiliary mass 50 and the auxiliary base stand 25 side by side, and the vibration damping device 10 can be downsized.

  In the present embodiment, the outdoor work machine 1 includes a traveling crawler 2, a cabin 3 in which a cockpit is provided, and a counterweight 7 provided as a weight behind the cabin 3. The vibration damping device 10 is provided on the top.

  The outdoor work machine 1 can effectively prevent the vibration generated during the work of the outdoor work machine 1 from being transmitted to the vicinity because the vibration control device 10 suppresses the vertical vibration generated in the heavy counterweight 7.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The vibration damping device of the present invention is not limited to the outdoor work machine described above, and can be used for other machines and equipment.

1 Outdoor work machine 2 Crawler 3 Cabin 7 Counterweight (object)
DESCRIPTION OF SYMBOLS 10 Damping device 11 Main base stand 13 Main support | pillar 20 Main mass 21 Main mass accommodation recessed part 23 Main mass support hole 25 Sub base stand 27 Sub support | pillar 30 Main spring 40 Main damper 50 Sub mass 51 Sub mass through hole 53 60 Secondary spring

Claims (4)

A vibration control device for suppressing vibration of an object,
A main mass having a predetermined mass;
A main spring connecting the main mass to the object;
A submass having a smaller mass than the main mass;
A secondary spring connecting the secondary mass to the primary mass;
A main damper interposed between the main mass and the object ,
A main mass accommodating recess for accommodating the sub mass is formed in the main mass,
A sub-mass through hole is formed in the sub-mass to allow the main damper to pass through.
The main damper is disposed on a center line passing through the center of gravity of the main mass and the center of gravity of the sub mass, respectively.
The vibration damping device characterized in that the main mass and the sub mass vibrate in the vertical direction. Comprising a main column erected on the object;
A main mass support hole is formed in the main mass to penetrate the main column,
The main spring is
Formed in a coil shape penetrating the main column,
The vibration damping device according to claim 1, wherein the vibration damping device is interposed between the main mass and the object . A vibration control device for suppressing vibration of an object,
A main mass having a predetermined mass;
A main spring connecting the main mass to the object;
A submass having a smaller mass than the main mass;
A secondary spring connecting the secondary mass to the primary mass;
A sub-base base coupled to the lower surface of the main mass;
A sub strut erected on the sub base stand,
A main mass accommodating recess for accommodating the sub mass is formed in the main mass,
A sub mass support hole for penetrating the sub column is formed in the sub mass,
The secondary spring is
It is formed in a coil shape that penetrates the sub strut,
Interposed between the sub-mass and the sub-base,
The vibration damping device characterized in that the main mass and the sub mass vibrate in the vertical direction . A crawler traveling,
A cabin where a cockpit is provided;
A counterweight provided as a weight behind the cabin, and an outdoor work machine comprising:
The outdoor work machine according to claim 1 , wherein the vibration damping device according to claim 1 is provided on the counterweight as the object .

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