JPS5945053B2 - Compound vibration oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compound vibration oscillator that simultaneously generates vertical vibration, torsional vibration, etc., and is used for driving and pulling out circular-section piles, or for exciting compacted steel pipes for soil improvement. With this type of oscillator, which generates complex vibrations, energy-efficient work can be promoted and Vibration pollution to the outside of the construction boundary will be less likely to occur.

However, in the conventional oscillator, since a pair of oscillation shafts each having an eccentric weight are configured in one stage, the excitation force in the vertical and torsional directions generated by the rotation of the eccentric weight is always constant. Since it is difficult to change this,
When driving and pulling out piles, a significant amount of energy was lost to the surrounding ground, and work efficiency was poor.

Also, in the case of soil improvement, etc.) compared to the energy added,
In many cases, the improvement effect was not achieved.

Therefore, as shown in Japanese Patent Publication No. 37-5636, for example, there has been provided a vibratory pile driver in which the phase difference between eccentric weights is variable and the vibrational forces in the vertical and torsional directions can be adjusted.

However, the pile driver disclosed in this publication has four eccentric weights attached to two rotating shafts arranged on the same plane, and the phase difference can be adjusted by attaching them to different rotating shafts. The structure is such that two eccentric weights are attached to a hollow shaft, and the hollow shaft and rotating shaft are connected with a pin at the end.
It is difficult to balance the pile driver as a whole, and there is a risk that unstable vibrations may occur.

In addition, adjusting the phase difference requires removing each pin individually, which is very troublesome and
In a configuration in which the hollow shaft and the rotary shaft are connected with a pin, there is a problem that the output of the oscillator cannot be increased very much because the rigidity and strength of the hollow shaft and the connecting portion are limited.

The present invention was made in view of the above-mentioned drawbacks.
A plurality of oscillation shafts having approximately the same structure and having eccentric weights are arranged in two stages with the same number at equal intervals in the circumferential direction and radially, and the oscillation shafts in each stage are opposite to each other in the same direction and at the same rotation speed. and the phase difference between the rotational phase of the oscillation shaft of one stage and the oscillation shaft of the other stage can be changed by simultaneously rotating the oscillation shaft of one stage by a predetermined angle. By changing this phase difference appropriately, it is possible to change the vibration excitation force in the vertical direction and torsional direction, thereby generating vibrations that are most suitable for the construction purpose and target ground. The purpose of the present invention is to provide a composite oscillator that enables stable oscillation.

Hereinafter, the basic principle of the present invention and embodiments based thereon will be described with reference to the drawings.

FIG. 1 is a diagram explaining the principle of the present invention. As shown in the figure, two pairs of horizontal oscillation axes A having eccentric weights W are arranged in upper and lower stages, and each oscillation axis A rotates in the same direction in the direction of the arrow. Rotate by number.

It is assumed that the oscillation axes A of each stage rotate with the same phase, and that the phase angle between the oscillation axes of the upper stage and the lower stage can be changed as appropriate.

First, if the phase angles of the oscillation axes of the upper and lower stages are the same,
That is, to explain the case where the phase difference is zero, each oscillation axis rotates in the states shown in FIG. 1 a-1, a-2 and a-3.

At this time, the vibrational force in the vertical direction due to the centrifugal force of the eccentric weight fluctuates at the same period in both the upper and lower stages, so the forces of both stages are combined to produce a vibrational force that fluctuates with twice the amplitude.

On the other hand, as shown in Figure a-2, the vibrational forces in the torsional direction are opposite in direction and the same magnitude in the upper and lower stages, so both forces cancel each other out and become zero.

Therefore, when the phase difference between the upper and lower oscillation axes is zero, only the vertical excitation force is generated.

Next, when the phase difference between the upper and lower oscillation axes is π (180'), each eccentric weight W is set to CI? C2? It rotates in the state shown in c-3.

In this case, the vibrational forces in the vertical direction are opposite in direction and fluctuate equally in magnitude at the upper and lower stages, so they cancel each other out and become zero.

However, since the excitation forces in the torsional direction are in the same direction as shown in C-2 of the figure, they are combined and fluctuate with twice the amplitude.

Therefore, when the phase difference between the upper and lower oscillation axes is π, only the excitation force in the torsional direction is generated.

Further, when the phase difference between the upper and lower oscillation axes is π/2 (90'), each eccentric weight is set as shown in Fig. 1 b-1. It rotates in the state shown in b-2°b-3.

Therefore, in this case, the amplitude of the excitation force in the vertical direction and the excitation force in the torsional direction is smaller than when the phase difference is zero or π, but the excitation force in the vertical direction is the maximum at the same period. When this happens, the excitation force in the torsional direction also changes to reach its maximum value.

Furthermore, when the phase difference θ is 0〈θ〈π/2, the excitation force in the vertical direction is the main force, and when π/2〈θ〈π, the vibration in the torsional direction is the main force. can be generated.

Next, a specific example based on the above principle will be described.

In Figure 2, 1 is the main body of the oscillator, 2 is this main body 1
The output shaft 2af of the motor 2 is fixed to the center of the upper part of the motor with the output shaft facing downward, and the bevel gear 3 is fixed to the output shaft 2af of the motor 2, and the bevel gear 5 is fixed via the drive shaft 4 of the motor 2. .

Reference numeral 6 denotes an oscillation shaft supported horizontally in an upper case 1a provided at the upper part of the main body 1 so as to be orthogonal to the output shaft 2a. 6 has a bevel gear 8 that meshes with the bevel gear 3.
are fixed, and four oscillation shafts 6 are arranged radially at equal intervals in the circumferential direction.

Reference numeral 9 denotes a bearing 10 in the intermediate gear box 1b at the center of the main body 1.
The floating drum 9 is rotatably provided around the first drive shaft 4 via a shaft 10, and the floating drum 9 has a bevel gear 11 that meshes with the bevel gear 5.

A pair of floating shafts 12 are supported horizontally, and a second drive shaft 14 having a bevel gear 13 meshing with the bevel gears 11, 11 is supported vertically.

15 is inside the lower case 1c of the main body 1, and the second. The oscillator is supported horizontally orthogonally to the drive shaft 14, and the oscillation shaft 15 is also equipped with an eccentric weight 7', and the inner end of the oscillation shaft 15 is connected to the lower end of the second drive shaft 14. A bevel gear 17 that meshes with a bevel gear 16 is fixed to the oscillation shaft 15. Four oscillation shafts 15 are arranged radially at equal intervals in the circumferential direction, and each oscillation shaft 6, 15 have almost the same structure.

18 is a motor installed in the intermediate case 1b with its output shaft facing downward; 19 is a spur gear attached to the output shaft of this motor; this spur gear 19 is a ring gear fixed to the lower end of the floating drum 9; 20 is fitted.

When the motor 18 is driven to rotate the ring gear 20, the phase difference between the phase angle of the oscillation shaft 6 and the lower oscillation shaft 15 can be varied.

Note that 21 is a rotation angle limiting pad provided on the outer periphery of the floating drum 9.

Therefore, the effects of the embodiment configured as described above will be explained below.

In order to make the structure of the above embodiment easier to understand, an exploded perspective view thereof is shown in FIG.

First of all, when all the gears are meshed so that the upper and lower oscillation shafts 6 and 15 are at the lower end and the eccentric weights 7 and 7' are at the lower end, respectively, and when the motor 2 is driven in this state, the oscillation shaft 6, 6... are rotated by the bevel gear 3 in the same direction (direction of arrow A) when viewed from the drive shaft side, and the rotation of the motor 2 is caused by the first... Drive shaft 4 drives bevel gears 5, 11
, 13 to rotate the second drive shaft 14 in the opposite direction.

Then, the lower oscillation shafts 15, 15, . . . are rotated in the direction opposite to the upper oscillation shaft 6 (in the direction of the arrow).

At this time, the combination of bevel gears is determined so that the oscillation shafts 6 and 15 rotate at the same number of rotations.

Therefore, under this setting condition, the oscillation axis a-1, a-
They rotate in the order of 2, a-3, and the vibrations in the torsional direction cancel each other out, producing only vibrations in the vertical direction.

Next, when the motor 18 is driven once to rotate the idler drum 9, as is clear when considering the state where the first drive shaft 4 is stationary, when the idler drum 9 rotates in the convex arrow direction t, the idler shaft 12.12 The lower oscillation shaft 15 rotates in the two directions of the arrows.
, 15... are rotated in the direction of the arrow.

Therefore, by rotating the floating drum 9 at an appropriate angle, each oscillation shaft 15, 15, . Can be set to .

If the motor 2 is driven with the phase difference set to π in this way, the oscillation shafts 6 and 15 will move as shown in FIG.
They rotate in the order of 1, c-2, and c-3, and the vibrations in the vertical direction cancel each other out, so that only the vibration in the torsional direction is generated.

Furthermore, if the rotation of the motor 18 is set appropriately to rotate the oscillation shaft 15 by 90 degrees from the state shown in FIG.
It can be rotated in the state shown in b-2 and b-3.

In this way, this device can generate arbitrary complex vibrations by appropriately rotating the motor 18.

Now, in a compound vibration oscillator having the above-described configuration, a compound vibration is generated by combining excitation forces in the vertical direction and in the torsional direction.

Furthermore, since the oscillation shafts 6 and 15 are arranged radially at equal intervals in the circumferential direction, the oscillation shafts 6 and 15 of each stage are symmetrical with respect to the drive shafts 2a and 4.14 provided in the vertical direction. At the same time, since the oscillation shafts 6.degree. 15 in the upper and lower two stages are configured in the same number, the direction t is also symmetrical.

In other words, the oscillation axis is 6.15 in both the horizontal and vertical directions.
By arranging the oscillators symmetrically, the static and dynamic balance of the compound oscillator can be easily maintained, so that unstable vibrations will not occur.

Furthermore, since the phase difference is changed by simultaneously rotating the lower oscillation shaft 15 in the same direction, the dynamic balance of the oscillator can be maintained even when the vibration mode of the oscillator is changed.

Furthermore, since the oscillation shafts 6 and 15 are arranged in two stages, the upper and lower stages, the excitation force is distributed between the upper and lower stages, and the internal stress of the entire oscillator is dispersed, allowing for rational mechanical design. Since the respective oscillation shafts 6 and 15 are connected by bevel gears 8 and 17, no strength problem will occur even if the weight of the eccentric weights 7 and 7' is increased to increase the output of the oscillator.

As explained above, the present invention 1 is a compound vibration oscillator that is arranged radially at equal intervals in the circumferential direction so as to be orthogonal to a vertical drive shaft, and has an eccentric weight on one side of the shaft. ,
A plurality of rotatably supported oscillation shafts are arranged in the same number of upper and lower stages, and the oscillation shafts in each stage are driven by drive shafts through bevel gears so as to rotate in the same direction and at the same speed when viewed from the drive shaft. The gears are combined so that the upper and lower oscillation shafts are rotated in opposite directions, and the universal oscillation shafts are simultaneously rotated by a predetermined angle to eliminate the phase difference between the oscillation shafts on the other stage. By changing the phase difference appropriately, it is possible to generate any complex vibration by changing the excitation force in the vertical direction and torsional direction. It is possible to obtain vibrations most suitable for the ground, improve construction efficiency, and minimize ground vibrations outside the construction area.

In addition, if an idler drum is provided between the upper and lower oscillation shafts, the idler shaft has a bevel gear that meshes with the bevel gear fixed to the drive shaft of each oscillation shaft. , it becomes possible to adjust the phase difference between the upper and lower oscillation axes very easily.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of a compound vibration oscillator according to the present invention, Fig. 2 is a cross-sectional front view showing an embodiment of the invention, and Fig. 3 is an exploded perspective view illustrating the structure of the device of this embodiment. be. 4.14... Drive shaft, 6,15... Oscillation axis, 7゜7'... Eccentric weight, 9... Idle drum, 12... ...Idle shaft, 20...Ring gear.

Claims (1)

[Scope of Claims] 1. A drive shaft that is radially arranged at equal intervals in the circumferential direction perpendicular to one perpendicular drive shaft, has an eccentric weight on one side of the shaft, and is rotatably supported. A plurality of oscillation shafts with the same configuration are arranged in two stages with the same number on the top and bottom, and the oscillation shafts in each stage are rotated by the drive shaft via bevel gears in the same direction and at the same rotation speed when viewed from the drive shaft. , and the gears are combined so that the rotation directions of the upper and lower oscillation shafts are opposite, and the oscillation shafts of one stage are simultaneously rotated by a predetermined angle to change the phase difference between the oscillation axes of the other stage. A compound vibration oscillator that can do this. 2. An idler drum is provided between the two oscillation shafts, which is rotatable around the same axis as the drive shaft, and within this drum there is a drive shaft that drives the upper oscillation shaft, and a lower oscillation shaft. A floating shaft having a bevel gear that meshes with a bevel gear fixed to each driving shaft is provided, and a ring gear is attached to the outer periphery of the floating drum, and the floating drum is connected to other drums via the ring gear. 2. The compound vibration oscillator according to claim 1, wherein the phase difference between the upper and lower oscillation shafts can be adjusted by rotating the oscillation shafts using a driving means.