JP3120064B2 - Exciting force generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating force generator provided in a pile driving machine for driving or pulling out a steel pipe pile or the like. The present invention relates to a vibrating force generator capable of arbitrarily adjusting a vibrating force within a range from a vibrating force to a maximum vibrating force.

[0002]

2. Description of the Related Art Conventionally, a vibratory pile driving machine has been used in civil engineering work for driving steel sheet piles, steel pipe piles, etc. (hereinafter referred to as "pile") into the ground and for pulling out the driven pile. I have.
As one kind of means for generating the vibrating force in such a vibrating pile driver, a weight for generating a vibrating force by a reaction force of a centrifugal force generated by rotating an unbalanced weight provided in a casing. There is a weight type vibrating force generator.
For example, in a two-axis type vibrating force generating device, a centrifugal force in the horizontal direction is canceled by rotating unbalanced weights disposed substantially horizontally in opposite directions, and a straight line is formed only by the centrifugal force in the vertical direction. The pile is driven or pulled out by vibrating only in the vertical direction by generating a vibrating force in a shape.

[0003] An example of a vibratory pile driving machine provided with a vibrating force generating device will be described. When a pile driving operation is performed by the vibratory pile driving machine, a chuck provided at a lower portion of the vibrating pile driving machine is used. The pile is gripped by the device, the whole is lifted to a predetermined position by a hanging machine such as a pile driver, and the pile is vibrated in the vertical state by vibrating the vibrating pile driving machine in this state, and the pile is driven into the ground.

However, this type of vibratory pile driver passes through the natural frequency of the hanging machine and the natural frequency of the ground from the start of operation until reaching the rated operation state. Resonance occurs when these natural frequencies match. The resonance is a resonance or noise of the surrounding ground that occurs only when the natural frequency is passed, but may adversely affect the surrounding environment.

In the case of such a vibrating pile driving machine, there is a case where the pile is driven halfway and stopped. In this case, a large load acts when the driving is started again. As this load, the starting load acts together with the frictional resistance between the pile and the ground in contact with the pile, so that a large load acts on the drive motor. At this time, since the drive motor requires a large starting torque, a large starting power is required, which may cause an overload, and may cause a start failure of the electric motor. In particular, when the ground is hard, the motor may seize due to overload and the operation may not be possible.

In such a case, if the eccentric moment of the eccentric weight can be adjusted, it is possible to disassemble and adjust the amount of the eccentric moment, and assemble the assembly. It takes a lot of time and labor to disassemble and disassemble. In addition, the operation must be performed with the eccentric moment lowered, and the work for adjusting the eccentric moment and the reduction of the moment cause a large delay in the construction period.

On the other hand, in order to absorb vibrations acting on a crane or the like holding such a vibratory pile driving machine, such a vibratory pile driving machine is usually suspended by a spring.
For this reason, it is also important to prevent large vibrations from occurring when the spring is passed through the resonance point at the time of startup.

Further, when determining a stop position at which the pile is driven to a predetermined position and stopped, it is necessary to stop the motor in consideration of the driving amount until the vibratory pile driver is completely stopped. Because of this, the vehicle is often stopped before reaching the predetermined position. In this case, position control is performed by repeatedly stopping and driving just before the predetermined position, which causes problems such as start-up failure due to a high load at the time of restart, and generation of vibration in the surroundings due to resonance when the spring passes through the resonance point. And accurate position control is also difficult.

As a conventional technique for preventing such an adverse effect, there is an invention described in Japanese Patent Application Laid-Open No. 9-78579. In this invention, as shown in a sectional view in plan view of FIG. Two-system eccentric weight rotating drive system 51,
52 is provided, and the other eccentric weight rotating drive system 52 is provided with respect to the weight 53 provided in one eccentric weight rotating drive system 51.
Is attached so as to be relatively rotatable. By switching these rotational phase differences to a state of 0 degrees or a state of 180 degrees or less, the driving force at the time of starting and stopping is reduced, and the pile driving operation can be performed with the maximum driving force at the time of rated operation. (Conventional example 1).

[0010] Another prior art is disclosed in Japanese Patent Application Laid-open No. Hei 9-3.
No. 891, there is a fixed eccentric weight and a movable eccentric weight, and these weights are symmetrically positioned with respect to the rotation axis, and a reference state of zero excitation force and movable The eccentric weight can be adjusted from the reference state to the state where the maximum vibrating force is rotated by an acute angle θ. Work can be performed (conventional example 2).

[0011]

However, in the above-mentioned prior art example 1, the operation can be performed only with a vibrating force of 0 degree or 180 degrees or less, so that one of the two drive motors is used for driving the other. The change in the excitation force between the minimum excitation force when turning while pressing and the maximum excitation force when turning while pulling the other by the other drive motor is performed only by control of the drive motor. Is difficult, and it is difficult to change the vibrating force smoothly. In addition, since the excitation force cannot be adjusted from the minimum to the maximum excitation force, the work must be performed only with the maximum excitation force determined by the pile driving operation conditions such as soil quality and pile type. Depending on the case, large vibration may occur.

In the second prior art, since the weight is adjusted within the range of the acute angle, the adjustment range of the vibrating force is narrow. It is difficult to respond to the demand for driving force. Moreover, means for rotating the movable eccentric weight to adjust the vibrating force is not clearly described.

[0013]

Therefore, in order to solve the above-mentioned problems, the invention according to the present application provides a fixed weight and a movable weight on a shaft, and adjusts to a facing position at the time of starting / stopping. Operate by minimizing vibration force (moment), and adjust the position of the movable weight in a normal operation state so that it can be adjusted steplessly.
The vibrating force can be adjusted steplessly between the minimum vibrating force and the maximum vibrating force.

As described above, the vibrating force of the weight can be adjusted steplessly from the minimum to the maximum, so that the weight can be started quietly with the vibrating force being minimized, and the operating state can be maintained as it is. Work can be performed by gradually adjusting the vibration force up to the maximum vibration force, and at the end of the work, the vibration force can be minimized and the operation can be stopped quietly. Thereby, the work which does not generate large vibration at the time of starting / stopping can be performed. Moreover, the vibrating force can be arbitrarily adjusted according to the load during operation.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to the present application is directed to a first support shaft which is driven to rotate by a predetermined driving device, a second support shaft which is driven by the first support shaft via a first gear mechanism, and A first unbalanced weight fixed to the first support shaft, a second unbalanced weight fixed to the second support shaft, and rotation about an axial direction with respect to the first support shaft and the second support shaft, respectively; A third unbalanced weight and a fourth unbalanced weight, freely provided, a second gear mechanism for interlocking the rotation of the third unbalanced weight and the fourth unbalanced weight, A third unbalanced weight with respect to the first unbalanced weight and the second unbalanced weight, comprising an input shaft meshed with the gear on the gear mechanism side and an output shaft meshed with the gear on the second gear mechanism side; , A differential device for adjusting the relative angle of the fourth unbalanced weight.

Thus, the movable weight constituted by the third and fourth unbalanced weights is rotated and balanced at a position opposed to the fixed weight constituted by the first and second unbalanced weights. If it starts up in a state where it is in a state of vibration, it can be started with small vibration, and after reaching the rated rotation speed, gradually rotate the movable weight and move it to the maximum centrifugal force position to generate vibration with the maximum vibrating force it can. Since the rotation of the movable weight is performed by the differential device, it is possible to control the differential device to stop at an arbitrary excitation force position even in the operating state. An arbitrary vibrating force can be generated from the state described above to the maximum vibrating force. If this minimum vibrating force can be adjusted to a state of zero vibrating force, starting and stopping of zero vibrating force can also be performed.

An input bevel gear driven by the input shaft on the fixed weight side, an intermediate bevel gear meshing with the bevel gear on an axis orthogonal to the input bevel gear, An output bevel gear that meshes and drives an output shaft on the movable weight side, a differential casing provided with a shaft that internally supports these bevel gears and supports an intermediate bevel gear, and rotates the differential casing. With a differential motor, a differential device capable of arbitrarily rotating a rotating movable weight can be easily configured.

Also, there is provided an unbalanced weight provided on the two left and right shafts, and a drive for rotating the unbalanced weight, and the centrifugal force of the unbalanced weight rotated by the drive causes vibration. In the two-axis type vibrating force generating device for generating the weight, the unbalanced weight is fixed to each axis by a substantially 90-degree fixed weight,
A movable weight of approximately 90 degrees rotatably provided on the shaft; and a driving system for the movable weight, wherein the movable weight is rotated while the movable weight is rotating, and a fixed weight is formed. By providing a differential that adjusts the centrifugal force of an unbalanced weight by adjusting the relative angle of A force generator can be configured.

The movable weight adjusting rotation angle of the differential device is set between a position where the fixed weight and the movable weight face each other and a position where the fixed weight and the movable weight face in the same direction. If it is configured to be possible in a range of approximately 90 degrees, in a two-axis type vibrating force generator, the range from the minimum vibrating force to the maximum vibrating force of an unbalanced weight of approximately 180 degrees with both weights is obtained. Excitation force can be adjusted arbitrarily.

Further, there is provided an unbalanced weight provided on four axes of up, down, left and right, and a driving device for rotating the unbalanced weight,
In a four-axis type vibrating force generator that generates vibration by centrifugal force of an unbalanced weight rotated by the driving machine, the unbalanced weight is fixed to a fixed weight fixed to each of two left and right axes. ,
And a movable weight fixed to the other two left and right axes, respectively, and the movable weight is rotated by the movable weight driving system while the movable weight is being rotated. By providing a differential device that adjusts the relative angle to adjust the centrifugal force of the unbalanced weight, the vibrating force can rotate the rotating movable weight and arbitrarily adjust the centrifugal force of the unbalanced weight. A generator can be configured.

The movable weight adjusting rotation angle of the differential device is set between a position where the fixed weight and the movable weight face each other and a position where the fixed weight and the movable weight face the same direction. If it is configured to be possible in the range of approximately 180 degrees, the four-axis type vibrating force generator can arbitrarily adjust the vibrating force in the range from the minimum vibrating force to the maximum vibrating force due to all unbalanced weights. can do.

Furthermore, if these differential devices are provided with a control means for detecting a load acting on the driving machine and adjusting the movable weight to a rotation angle corresponding to the load, the differential machine acts on the driving machine. Since the vibrating force of the unbalanced weight can be adjusted according to the load, a stable operation can be performed while avoiding an overload of the driving machine.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the invention according to this application.
FIG. 2 is a side view of the vibrating force generating device according to the embodiment, illustrating only a main configuration in a state where a casing is opened. FIG.
FIG. 2 is a cross-sectional plan view of the vibrating force generating device shown in FIG. FIG. 3 is a perspective view showing the gear configuration of the differential gear. This first embodiment is based on 2
3 shows an axial type vibrating force generator.

As shown, two first and second support shafts 2 and 3 are provided side by side on a casing 1, and these first and second support shafts 2 and 3 are respectively provided with unbalanced weights 4 and 5. Is provided. These unbalanced weights 4, 5 are
The two support shafts 2 generate an eccentric moment when 5 faces up and down, and cancel each other when facing 5 left and right.
The first gear 6 and the second gear 7 provided on the gear 3 are configured to mesh with each other and rotate in mutually opposite directions.

The first and second support shafts 2 and 3 are driven by
This is performed by driving a drive pulley 8 provided on the first support shaft 2 with a V-belt 11 wound around a pulley 10 of a drive motor 9 provided on the casing 1. In this embodiment, it is driven by one drive motor 9.

In this embodiment, the unbalanced weights 4 and 5 are fixed weights 4A and 5 formed in a fan shape of approximately 90 degrees.
A and the movable weights 4B and 5B are configured to balance the weight at opposing positions and to form a semicircular unbalanced weight at adjacent positions. The fixed weights 4A, 5A are attached to mounting portions 4a, 5a formed at the center.
Are fixed by keys 2a, 3a provided on the support shafts 2, 3, and the movable weights 4B, 5B are fixed to the fixed weights 4A, 5A.
A mounting portions 4b and 5b are formed so as to sandwich the mounting portions 4a and 5a of A, and the mounting portions 4b and 5b are provided so as to be rotatable around the support shafts 2 and 3. This fixed weight 4
A and 5A are rotated in opposite directions by first and second gears 6 and 7, and movable weights 4B and 5B are rotated in opposite directions by third and fourth gears 12 and 13 provided oppositely. ing.

The movable weights 4B and 5B are driven by a differential device D provided between the second gear 7 and the third gear 12.

As shown in FIG. 3, the differential device D includes an input shaft 1 provided with a fifth gear 14 meshing with the second gear 7.
5 and an output shaft 17 provided with a sixth gear 16 are supported by the casing 1.

The differential device D includes an input bevel gear 18 driven by an input shaft 15 and an intermediate bevel gear provided on a differential casing 19 and provided on an intermediate shaft 20 driven by the input bevel gear 18. 21, an output bevel gear 22 driven by the intermediate bevel gear 21, a differential gear 23 provided on the outer periphery of the differential casing 19, and a drive gear 24 a for rotating the differential gear 23. And a differential motor 23.
By rotating the differential casing 19, the differential casing 19 is rotated to cause the output shaft 17 to advance or delay with respect to the input shaft 15.

This configuration is similar to that of a so-called vehicle differential. If the differential gear 23 is rotated while the output shaft 17 is driven by the input shaft 15 via the intermediate bevel gear 21, “Leading” or “lagging” can be generated from a predetermined relative angular position of the input shaft 15 and the output shaft 17. In other words, the relative angle (rotational phase difference) of the output shaft 17 to the input shaft 15 can be arbitrarily adjusted by controlling the rotation angle of the differential motor 24 even during power transmission.

The power transmitted to the output shaft 17 is
The power is transmitted from the sixth gear 16 provided on the output shaft 17 to the seventh gear 25 provided side by side, and from the eighth gear 27 provided on the same shaft 26 as the seventh gear 25 to the third gear 12. And the movable weights 5B and 4B are rotated in opposite directions.

By transmitting the power through the fifth gear 14 to the eighth gear 27 in this manner, the fixed weight 4A and the movable weight 4B and the fixed weight 5A and the movable weight 5B are moved in the same direction. To rotate.

The control angle for rotating the differential gear 23 is such that when the differential casing 19 is rotated about 90 degrees, the intermediate shaft 20 rotates about 90 degrees, but the input shaft 15 rotates at a fixed position. Therefore, if the input bevel gear 18 and the output bevel gear 22 have the same number of teeth, "lead" or "lag" can be generated at the output shaft 17 at a double angle. In this embodiment, the number of teeth of the eighth gear 27 is about 1 / the number of teeth of the third gear 12.
By setting 2, the angle of rotation of the differential gear 23 and the angle of “advance” or “delay” of the third gear 12 are substantially the same. The configuration of the number of teeth may be appropriately determined according to the specifications of the vibrating force generator.

In this embodiment, the movable weights 4B and 5B can be adjusted at an angle of about 90 degrees with respect to the fixed weights 4A and 5A, so that the vibrating force is set at a position where both weights are opposed to each other. The vibrating force can be arbitrarily adjusted within a range from the minimum vibrating force of zero to the maximum vibrating force where both weights are adjacent to each other.

The first and second support shafts 2 and 3, the input shaft 15, the output shaft 17 and the like are supported by the casing 1 via bearings (indicated by "x" in the figure). Further, the first and second gears 6 and 7, the fifth, sixth, seventh and eighth gears 1
4, 16, 25 and 27 are fixed to the respective shafts by keys.

The vibrating force generator V configured as described above
According to ₁ , as shown in FIGS. 4 (a) to 4 (c), a schematic diagram showing an example of the unbalanced weight rotating position is shown. Vibration force can be generated.

That is, at the time of startup, as shown in (a), the differential motor 24 of the differential device D is driven to move the movable weight 4
B, 5B are rotated to the side opposite to the fixed weight, and the fixed weights 4A, 5
A is set to face A. By driving the drive motor 9 in this state, the first support shaft 2 is
Then, the second gear 7 and the second support shaft 3 are rotated in opposite directions via the first gear 6 provided on the first support shaft 2.
Further, the power transmitted from the second gear 7 to the differential D via the fifth gear 14 is transmitted from the sixth gear 16 to the seventh and eighth gears.
The power is transmitted to the third gear 12 via the gears 25 and 27, and the movable weight 5 is transmitted by the third gear 12 and the fourth gear 13.
B and 4B are rotated in opposite directions. At this time, the force for rotating the fixed weights 4A, 5A and the movable weights 4B, 5B is substantially zero in the vibrating force where both weights are balanced at the opposing positions. A small driving force enough to rotate the weight is sufficient, and it is possible to rotate without generating vibration. In this embodiment, the weights are balanced at the opposing positions. However, depending on the conditions of use, the weights may be configured to substantially oppose each other and driven by a small vibrating force.

When the drive motor 9 reaches the rated speed, the differential gear 24 is driven by the differential motor 24 of the differential device D.
3 to rotate from the facing state as shown in (a) above.
As shown in (b), the movable weights 4B and 5B are
A and 5A are turned to face the same direction. That is, by adjusting the relative angle (rotational phase difference) of the output shaft 17 with respect to the input shaft 15 of the differential device D, the fixed weights 4A and 5A and the movable weights 4B and 5B are rotated so as to be adjacent to each other. And the unbalanced weights 4, which have become semicircular as a whole,
5, so that the maximum vibrating force is exerted.

The fixed weight 4 rotated in this manner
A, 5A and the movable weights 4B, 5B are formed in such a manner that the first support shaft 2 and the second support shaft 3 are rotated in directions opposite to each other. Generates a natural vibration.

Further, in the invention according to the present application, since the rotation angle of the differential gear 23 by the differential motor 24 can be arbitrarily adjusted and the relative angle can be arbitrarily maintained, the differential device D can be used. By adjusting the movable weights 4B, 5B to an arbitrary angle, for example, as shown in FIG.
If 5B is stopped at a substantially middle position of the adjustment range, it is possible to easily make the vibrating force approximately half the maximum vibrating force. That is, it is easy to arbitrarily adjust the vibrating force between the minimum vibrating force and the maximum vibrating force.

By making the vibrating force arbitrarily adjustable in this manner, for example, when the ground into which the pile is to be driven changes from a soft ground to a hard ground, as in a vibrating pile driver, for example. However, the driving operation can be continued by adjusting the vibrating force so that the load of the drive motor 9 is not overloaded, and the pile driving operation can be continued with high working efficiency without interrupting the operation.

In this case, a detector for detecting a load from the current of the drive motor 9 or the like is provided, and the differential gear 23 is rotated by a differential motor 24 in accordance with a signal from the detector to drive the drive motor 9.
A control means for controlling so as to prevent the overload may be provided. By performing feedback control by such a control means, a stable pile driving operation can be performed.

When the motor is stopped, the differential gear 23 is rotated by the differential motor 24 to rotate the differential casing 19 from the state shown in FIG.
Of the movable weight 4B, as shown in FIG.
5B is rotated so as to face the fixed weights 4A and 5A. In this state, as described above, the unbalanced weights 4 and 5 are balanced to be in the minimum vibrating force state in which the vibrating force is substantially zero, so that the vibrating force generator V _{1 is} generated without generating vibration. Can be stopped.

FIG. 5 is a side view of a vibrating force generating apparatus showing a second embodiment of the invention according to the present application, and shows only the main structure with the casing opened. FIG. 6 shows FIG.
It is sectional drawing in planar view of the vibrating force generator shown in FIG.
This second embodiment shows a four-axis vibrating force generator.
The same components as those of the first embodiment will be described with the same reference numerals.

As shown in the drawing, in the second embodiment, two first and second support shafts 29, 3
0 are arranged side by side, and the third and fourth support shafts 31,
The first and second support shafts 29 and 30 are provided with fixed weights 33 and 34, respectively, and the third and fourth support shafts 31 and 32 are movable. Weights 35 and 36 are provided. These unbalanced weights 3
3, 34, 35, and 36 are formed in a semicircular shape of approximately 180 degrees, and the respective unbalanced weights 33, 34, 35, and
36 is fixed by keys 29a, 30a, 31a, 32a provided on the support shafts 29, 30, 31, 32.

Then, all the unbalanced weights 33, 34, 35,
The support shaft 2 on the right side of the figure generates a vibrating force when the head 36 is turned in the vertical direction, and cancels out when the head is turned in the left-right direction.
First and fourth gears 37 and 40 provided on the left and right support shafts 30 and 31 and second and third gears 38 provided on the left support shafts 30 and 31, respectively.
39 are configured to mesh with each other and rotate in mutually opposite directions. In the case of such a four-shaft configuration, if the third gear 39 is driven by the sixth gear 16 provided on the output shaft 17, the third support shaft 31 and the first support shaft 29 rotate in opposite directions, and The fourth support shaft 32 and the second support shaft 30 rotate in opposite directions, and can exert a vibrating force only in the vertical direction as a whole.

To drive the first support shaft 29, a drive pulley 41 provided on the first support shaft 29 is driven by a drive motor 42
The second gear 38 of the second support shaft 30 is driven by the first gear 37 of the first support shaft 29, and the difference from the second gear 38. The third gear 39 of the third support shaft 31 is driven via the moving device D, and the fourth gear 40 of the fourth support shaft 32 is driven by the third gear 39, so that all the support shafts 29, 30, 31, and. 32 has been rotated.

The differential gear D provided between the second gear 38 and the third gear 39 has the same structure as that of the first embodiment, and the fifth gear 14 meshing with the second gear 38 is provided. The input shaft 15 and the output shaft 17 provided with the sixth gear 16 are supported by a casing 28. Since the internal structure of the differential device D is the same as the vibratory force generator V ₁ of the first embodiment, description thereof will be omitted given the same reference numerals.

Since the second embodiment has a four-axis configuration, the upper portions are fixed weights 33 and 34, and the lower portions are movable weights 35 and 34.
36, the movable weights 35, 3
Rotation of the movable weight 6 makes it possible to adjust the vibration within a range from zero to the maximum vibrating force, so that the rotation angles of the movable weights 35 and 36 with respect to the fixed weights 33 and 34 are “advanced” or “lagged”.
Is caused.

Further, according to the second embodiment, the third gear 39 may be driven by the sixth gear 16 rotated in the reverse direction by the differential gear D, and the seventh gear 25 of the first embodiment may be driven. , The eighth gear 27 and the shaft 26 can be omitted, and the configuration can be simplified.

In the case of the second embodiment, first to fourth
The support shafts 29 to 32, the input shaft 15, the output shaft 17, and the like are supported by the casing 1 via bearings (indicated by “x” in the figure). Also, the first to fourth gears 37 to 40, the fifth to sixth gears
The gears 14, 16 are fixed to the respective shafts by keys.

[0052] Also by exciting force generating device V ₂ of the second embodiment constructed as described above, start the stop or the like, as in the first embodiment, by driving the differential motor 24 differences By rotating the moving casing 19, the movable weight 35,
By rotating the 36 so as to face the fixed weights 33, 34, the vibrating force generated by all the weights 33, 34, 35, 36 can be minimized, so that large vibration does not occur in the periphery. it is possible to start and stop the vibratory force generator V _2.

When the drive motor 42 reaches the rated rotation speed after starting with the minimum vibrating force, the differential motor 24
By rotating the differential casing 19 by
The movable weights 35, 36 face in the same direction as the fixed weights 33, 34, and vibration can be generated by the maximum vibrating force of the all unbalanced weights 33, 34, 35, 36. Since the rotation of the movable weights 35 and 36 is performed by the differential device D, the weights can be rotated in a state where all the weights are rotated, and if the differential motor 24 is controlled, the rotation can be performed at an arbitrary angle. It can also be stopped, and it becomes possible to work while changing the setting to an arbitrary excitation force between the minimum excitation force and the maximum excitation force during operation.

Also in the second embodiment, the drive motor 4
If a detecting means for detecting the load from the current value of the second and the like is provided, and a control device or the like controls the rotation angle of the differential motor 24 according to the signal of the detecting means to adjust the vibrating force, the driving motor is always Vibration force control according to the load can be performed so that the load of the drive motor 42 is not overloaded, and the drive motor can be protected by controlling the load of the drive motor 42 constant.
In this case, for example, in the case of a pile driving operation, preferable output control can be performed according to a change in the ground, and a stable pile driving operation can be performed.

[0055] In the above embodiment, the two-shaft of has been described electromotive force generating device V ₂ embodiment of vibratory force generator V ₁ and 4-shaft, the other vibratory force generator axis configuration Even so, the invention according to this application can be applied, and the invention is not limited to the shaft configuration.

[0056]

The invention according to this application is implemented in the form described above, and has the following effects.

If the movable weight is started in a state where the movable weight is rotated and balanced at a position facing the fixed weight, no large vibration is generated, and the movable weight is gradually rotated after reaching the rated rotation speed. When the movable weight is rotated to the maximum centrifugal force position, vibration of the maximum vibrating force can be generated. Since the rotation of the movable weight is performed by a differential device, it is necessary to control the differential device. For example, it is possible to configure a vibrating force generating device that can be adjusted to an arbitrary vibrating force from the minimum vibrating force to the maximum vibrating force even during operation. For this reason, it is possible to perform a work in which the vibrating force is arbitrarily adjusted according to a change in work conditions such as a change in soil properties.

An input bevel gear driven by the input shaft on the fixed weight side, the intermediate bevel gear meshed with the input bevel gear, and an output on the movable weight side meshed with the intermediate bevel gear. An output bevel gear that drives the shaft, a differential casing provided with a shaft that internally supports these bevel gears and supports an intermediate bevel gear, and a differential motor that rotates the differential casing, A differential device capable of arbitrarily rotating a rotating movable weight can be easily configured, and if a differential motor is controlled, it is possible to easily adjust a vibrating force appropriately.

In the two-axis vibrating force generator, the unbalanced weight is composed of a fixed weight of approximately 90 degrees and a movable weight of approximately 90 degrees. By providing a differential that adjusts the centrifugal force of the unbalanced weight by rotating the movable weight, the two axes that can arbitrarily adjust the centrifugal force of all the unbalanced weights while the movable weight is rotated This makes it possible to configure a vibrating force generator of the formula.

If the adjusting rotation angle of the differential device can be adjusted within a range of approximately 90 degrees between the position where the fixed weight and the movable weight face each other and the position adjacent to the movable weight, the vibration can be generated in a biaxial manner. It is possible to configure a vibrating force generator having a wide range of force adjustment.

Further, in the four-axis type vibrating force generator having the shafts provided in the vertical and horizontal directions, the unbalanced weight is fixed to the left and right two shafts and the other two weights. And a movable weight fixed to each of the movable weights, and a differential device for rotating the movable weight to adjust the centrifugal force of the unbalanced weight is provided in a drive system of the movable weight, thereby rotating the movable weight. It is possible to configure a four-axis type vibrating force generator capable of adjusting the centrifugal force of the unbalanced weight by rotating the weight.

If the adjusting rotation angle of the movable weight by this differential device can be adjusted within a range of approximately 180 degrees, a four-axis type vibrating force generating device having a wide range of adjusting the vibrating force is formed. It becomes possible.

Further, if a control means for adjusting the rotation angle of the movable weight is provided in these differential devices to adjust the vibrating force of the unbalanced weight according to the load of the drive, the drive of the drive can be adjusted. A stable operation can be performed while avoiding overload, and a vibrating force generating device with high working efficiency can be configured.

[Brief description of the drawings]

FIG. 1 is a side view showing a main configuration of a vibration generating device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional plan view illustrating a driving device of the vibration generating device illustrated in FIG. 1 on a side portion.

FIG. 3 is a perspective view showing a gear configuration of the differential device shown in FIG. 2;

FIGS. 4A and 4B are schematic diagrams showing an example of an unbalanced weight rotating position of the vibrating force generator shown in FIG. 1, wherein FIG. 4A shows a vibrating force of zero, FIG. 4B shows a maximum vibrating force, and FIG. FIG. 3 is a schematic diagram showing an intermediate vibrating force.

FIG. 5 is a side view showing a main configuration of a vibrating force generator according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional plan view illustrating a driving device of the vibration generating device illustrated in FIG. 5 on a side portion.

FIG. 7 is a cross-sectional view in plan view showing a conventional vibrating force generator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 2 1st support shaft 3 2nd support shaft 4 Unbalanced weight 4A Fixed weight 4B Movable weight 4a, 4b Attachment part 5 Unbalanced weight 5A Fixed weight 5B Movable weight 5a, 5b Attachment part 6 1 gear 7 2nd gear 12 3rd gear 13 4th gear 14 5th gear 15 input shaft 16 6th gear 17 output shaft 18 input bevel gear 19 differential casing 20 intermediate shaft 21 intermediate bevel gear 22 output bevel gear 23 differential Gear 24 Differential motor 24a Drive gear 25 Seventh gear 26 Shaft 27 Eighth gear 28 Casing 29 First support shaft 30 Second support shaft 31 Third support shaft 32 Fourth support shaft 33,34 Fixed weight 35,36 Movable Weight 37 First gear 38 Second gear 39 Third gear 40 Fourth gear V ₁ , V ₂ Exciting force generator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B06B 1/16

Claims (5)

(57) [Claims] 1. A second support shaft driven by a first support shaft via a first support shaft rotatably driven by a predetermined driving device and a first gear mechanism including a first gear and a second gear. A first unbalanced weight fixed to the first support shaft, a second unbalanced weight fixed to the second support shaft, and an axial rotation around the first support shaft and the second support shaft. A third unbalanced weight and a fourth unbalanced weight, which are rotatably provided on the third gear, and a third gear and a fourth gear that rotate the third unbalanced weight and the fourth unbalanced weight in rotation. A second gear mechanism, an input shaft meshed with the gear on the first gear mechanism side, and an output shaft meshed with the gear on the second gear mechanism side. A vibrating force comprising: a differential device for adjusting the relative angles of the third unbalanced weight and the fourth unbalanced weight to the second unbalanced weight. Raw devices. 2. The vibrating force generating device according to claim 1, wherein the differential device comprises: an input bevel gear driven by an input shaft; and an intermediate bevel gear meshed with the bevel gear on an axis orthogonal to the input bevel gear. A gear, an output bevel gear that meshes with the intermediate bevel gear to drive an output shaft, a differential casing provided with a shaft for internally supporting these bevel gears and supporting the intermediate bevel gear, and the differential casing. A vibrating force generator, comprising: a rotating motor for rotating. 3. The vibrating force generating device according to claim 1, wherein the first and third unbalanced weights are fixed weights of approximately 90 degrees fixed to the first support shaft and the second support shaft, respectively. The second and fourth unbalanced weights are each constituted by a movable weight of approximately 90 degrees rotatably provided on the first support shaft and the second support shaft, respectively. Exciting force generator. 4. The vibrating force generating device according to claim 3, wherein the movable weight adjusting rotation angle of the differential device is set at a position where the fixed weight and the movable weight face each other, and between the fixed weight and the movable weight. A vibrating force generating device characterized in that the vibrating force generating device is configured to be possible in a range of approximately 90 degrees between a position adjacent to a weight and an adjacent position. 5. The vibrating force generating device according to claim 1, wherein a load acting on the driving machine is detected in the differential device, and the movable weight is adjusted to a rotation angle corresponding to the load. A vibrating force generating device, comprising: