JP2815494B2 - Vibration 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 vibration generating device applied to a vibrating pile driver, various shakers, a sieving device, etc., and more particularly to a vibrating force or an amplitude obtained by rotating an eccentric weight. The present invention relates to one that can be changed arbitrarily and steplessly.

[0002]

2. Description of the Related Art As a vibration generator utilizing centrifugal force generated by rotating an eccentric weight, an even number of pairs of rotating shafts to which an eccentric weight is attached are parallel to a casing member. While supporting, a transmission gear is attached to each rotating shaft so that adjacent ones mesh with each other, and one of the rotating shaft groups and the other rotating shaft group are rotated in opposite directions, so that the eccentric attached to each rotating shaft. In general, the vertical component of the centrifugal force is added while the horizontal component of the centrifugal force generated in the weight is offset, and the vertical component is applied to the casing member, for example, so as to give a vertical vibration force. Are known.

In such a vibration generator, the entire vibration generator is vibrated at a frequency corresponding to the rotation speed of the rotating shaft by supporting the casing member via a spring or a damper. Therefore, by operating a vibration generating device by supporting a pile such as a steel sheet pile on a casing member through a chuck or the like, a pile driving operation or a pile pulling-out operation can be performed, and further, such a vibration generating device can be shaker or sieved. Stirring work and sieving work can be performed by incorporating it into the device.

[0004]

In the conventional vibration generator as described above, since the eccentric weight is fixed to the rotating shaft, it is not easy to arbitrarily change the vibrating force or the amplitude during operation. . However, in such a vibration generating device, the driving force required to rotate the eccentric weight in the stationary state at the start of operation is significantly larger than that after the eccentric weight has reached the rated rotation speed. If the driving force required until the eccentric weight of the eccentric weight reaches the rated rotation speed can be reduced, the drive source such as a motor can be reduced in size, and the efficiency of energy use such as power consumption can be significantly improved. it can. Therefore, there is a need for a measure that can easily reduce the driving force required for rotation at the beginning of the rotation start of the rotation shaft.

Further, for example, in a vibration generator applied to a vibrating pile driving machine, in order to improve the workability of driving a pile and the work of pulling a pile, depending on the state of the ground into which the driven pile penetrates, etc. To easily change the excitation force or amplitude
Alternatively, a measure for preventing a resonance phenomenon that occurs at the time of starting or braking is also demanded.

[0006] In order to meet the above demands, several types of vibration generating devices with variable vibrating force or amplitude are currently considered, but all of them have a complicated structure, a large number of parts, and there is an inevitable disparity in cost. . In view of the above, the present invention provides a vibration generating device which can change the vibrating force or amplitude arbitrarily and steplessly even during operation, and has a simple and reasonable structure and can be easily manufactured. With the goal.

[0007]

In order to achieve the above-mentioned object, a vibration generator according to the present invention is basically supported by a casing member, and has a first fixed transmission gear and a first fixed eccentric. The weight is externally fitted and fixed, the first movable transmission gear and the first movable eccentric weight coupled to the gear are externally fitted to the first rotating shaft so as to be relatively rotatable, and the casing member is A second fixed transmission gear and a second fixed eccentric weight, which are axially supported in parallel with the first rotation shaft and mesh with the first fixed transmission gear, are externally fitted and fixed, and the first movable A second rotating shaft in which a second movable transmission gear meshing with the transmission gear and a second movable eccentric weight coupled to the gear are externally rotatably fitted; and the first and second rotating shafts A phase adjustment axis that is rotatable in parallel with at least one of the Are engaged with each other so as to be relatively rotatable, and one meshes with one of the first and second fixed conductive gears and the other meshes with one of the first and second movable conductive gears. A pair of phase adjusting gears,
A fluid working chamber is formed between the outer peripheral portion of the phase adjusting shaft and one of the phase adjusting gears, and the phase adjusting gear is moved relative to the phase adjusting shaft by supplying and discharging fluid to and from the fluid working chamber. And are configured to rotate relative to each other.

In one embodiment of the present invention, the fluid working chamber may be partitioned by a fixed partition wall fixed to the phase adjustment shaft and a movable partition wall fixed to the phase adjustment gear.

[0009]

In the vibration generating apparatus according to the present invention having the above-described structure, at least one of the phase adjusting gears is rotated relative to the phase adjusting shaft by supplying and discharging the fluid to and from the fluid working chamber, and the pair of phase adjusting gears is rotated. The gear rotates integrally with the phase adjustment shaft in a state where a phase difference has occurred.

When the phases of the pair of phase adjustment gears change as described above, the first and second rotation shafts to which one of the pair of phase adjustment gears is transmitted and the first and second rotation shafts attached thereto. The phase of the fixed eccentric weight of
The first and second movable transmission gears, to which the other rotation of the pair of phase adjustment gears is transmitted, rotate relative to the first and second rotation shafts, and accordingly, the first and second movable transmission gears rotate. The phase of the combined first and second movable eccentric weights is also the first phase.
And the second fixed eccentric weight changes in the opposite direction. Thereby, the horizontal component force generated in each eccentric weight is always canceled, while the total value of the vertical component force generated in each eccentric weight is the relative rotation angle of the pair of phase adjustment gears with respect to the phase adjustment axis. As a result, the vibrating force or amplitude applied to the casing member via the first and second rotating shafts is changed.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are a perspective view and an exploded view showing a main part of an embodiment of the vibration generator according to the present invention, and FIG. 6 is a case where the vibration generator of the embodiment shown in FIGS. 1 and 2 is applied. It is a front view showing an example of a vibrating pile driver.

In FIG. 6, a vibratory pile driving machine 1 has a hanger 5 provided with a hook for hooking a hook 2 of a hanging means such as a crane, and four guides suspended from the hanger 5. A shock absorber 7 having a rod 6 and a pair of upper and lower coil springs 8 and 9 compressed therein, an electric motor 14 as a drive source supported by a hanger 5 via the shock absorber 7, a casing member 20, The vibration generator 10 according to the present embodiment including a vibration generating unit, a belt 17 for power transmission, and pulleys 18 and 25 disposed inside the casing member 20, and provided below the vibration generator 10. Further, it comprises a chuck 12 for holding a pile such as a steel sheet pile. This vibratory pile driving machine 1 is a conventionally known one except for a vibrating force generating unit described later. The driving source is not limited to an electric motor, and any means such as a hydraulic motor can be used. Other than those described above, appropriate ones can be used.

As shown in detail in FIGS. 1 and 2, a vibrating force generating portion provided on the casing member 20 has a first driving force transmitted from the electric motor 14 via a pulley 25. A rotation shaft 21, a second rotation shaft 22 disposed substantially parallel to and parallel to the first rotation shaft 21;
Below the first and second rotating shafts 21 and 22, there is a phase adjusting shaft 90 that is arranged in parallel to and rotatable with them. In this embodiment, the phase adjustment shaft 90 is shown as being located below the first and second rotation shafts 21 and 22. However, the phase adjustment shaft 90 is not limited to the first and second rotation shafts 21 and 22. It will be clear that its position is not limited below it, as long as it is arranged parallel and rotatable to 22.

As shown in FIG. 2, both ends of the first rotating shaft 21 have side walls 20a, 20a of the casing member 20.
0b via bearings 26 and 27, a first fixed transmission gear 31 is externally fitted to the first rotating shaft 21 and fixed by a key 43, and is divided into first fixed parts. Eccentric weights 51Aa, 51Ab (51Aa and 51Aa
Ab is used together with the first movable transmission gear 32). The first movable transmission gear 32 is fixed around the side walls 20a and 20b of the casing member 20 by spline coupling.
A first movable eccentric weight 51B, which is integrally rotatable with the connecting pin 37, is fitted around the bearings 45 and 53 so as to be relatively rotatable.

The second rotating shaft 22 is supported by the side walls 20a and 20b of the casing member 20 via bearings 28 and 29. The second rotating shaft 22 has a first fixed transmission gear 31 A second fixed transmission gear 33 meshing with the second fixed transmission gear 33 is externally fitted and fixed by the key 44, and the divided second fixed eccentric weights 52Aa, 52Ab (the reference numeral 52A is used by combining 52Aa and 52Ab). A second movable transmission gear 34 and a second movable transmission gear 34 and a connecting pin 38 are coupled to each other so as to be integrally rotatable around the side walls 20a and 20b of the casing member 20 by spline coupling. The eccentric weight 52B is externally fitted via bearings 46 and 54 so as to be relatively rotatable.

The means for fixing the first and second rotating shafts 21 and 22 and the fixed eccentric weights 51A and 52A, or the first and second movable conductive gears 32 and 34 and the first and second movable gears. As shown here, the means for fixing to the eccentric weights 51B and 52B is not limited to the spline connection or the connection by the connecting pin, but any means can be used as long as it functions as the fixing means. Will.

Further, the phase adjusting shaft 90 is rotatably supported at both ends thereof by the side walls 20a and 20b via bearings 69 and 47 and in a state where relative movement in the axial direction is prevented. As shown in detail in FIG. 3, two hydraulic passages 91 and 92 are formed therein, and one end thereof is covered with a cover member 49 via a seal member 67 and a spacer 48. Supply / discharge passages 93 and 94 communicating with the hydraulic passages 91 and 92 are formed in the spacer 48 and the cover member 49, and a drain passage 79 is connected to a rear end thereof. The supply / discharge passages 93, 9
Hydraulic oil from an externally installed hydraulic unit is supplied to and discharged from a hydraulic system 4 via a piping system in which a switching valve and the like are interposed. And discharged therefrom.

On the phase adjusting shaft 90, a first phase adjusting gear 35 meshing with the second fixed transmission gear 33 and a second phase adjusting gear 36 meshing with the second movable transmission gear 34 are respectively provided. It is fitted externally in a state where movement in the axial direction is prevented. The first phase adjustment gear 35 is rotatable relative to the phase adjustment shaft 90, and one side of the first phase adjustment gear 35 is coupled with a working chamber forming member 99 as shown in detail in FIGS. 4 and 5. The phase adjusting shaft 9 is provided in the working chamber forming member 99.
A sleeve-shaped hydraulic working chamber 100 is formed which is surrounded by the outer periphery of the zero and the side of the first phase adjustment gear 35. The hydraulic working chamber 100 is sealed with a suitable sealing material or the like. Inside the hydraulic working chamber 100, a fixed partition wall 95 fixed to the phase adjusting shaft 90 by the pins 11 and the bolts 13 and a first phase adjusting gear 35 are bolted. The first working chamber 101 and the second working chamber 10 by the movable partition wall 96 fixed by
It is divided into two. One end of a hydraulic passage 91 is opened at an end of the first working chamber 101 on the fixed partition wall 95 side, and a hydraulic passage 92 is opened on an end of the second working chamber 102 at the fixed partition wall 95 side.
Is open at one end. On the other hand, the second phase adjusting gear 3
6 is fixed to the phase adjustment shaft 90 by a key 77.

The first and second fixed eccentric weights 51A and 52A and the first and second movable eccentric weights 51 are described above.
B and 52B each have a central angle of 180 ° as an example.
And the first and second fixed eccentric weights 51
The thickness of one of the first and second movable eccentric weights 51B and 52B is approximately half that of the first and second movable eccentric weights 51B and 52B. The eccentric weights 51B, 52B (including the pins 37, 38, etc.)
Their weight and shape are determined so that the eccentric moments are the same, and positioning is performed so as to be balanced in the left-right direction.

However, the first and second fixed eccentric weights 51A and 52A, and the first and second movable eccentric weights 51A and 52A,
The shapes, thicknesses, etc. of B and 52B are not limited to those described above, and their weight and shape, or positioning may be performed so that the eccentric moments are the same and balanced in the left-right direction. It is clear that there is.

In the vibration generating apparatus 10 of the present embodiment having the above-described configuration, when the hydraulic oil from the hydraulic unit is filled in the hydraulic working chamber through the hydraulic passages 91 and 92, the motor 14 The rotational driving force is belt 17
Via the first rotating shaft 21 → the first fixed transmission gear 31 →
The second fixed transmission gear 33 → the first phase adjusting gear 35 → the hydraulic working chamber 100 are sequentially transmitted to the phase adjusting shaft 90 via the first rotating shaft 21, the second rotating shaft 22, and the phase adjusting shaft. The rotation of the phase adjustment shaft 90 is sequentially transmitted to the second phase adjustment gear 36, the second movable transmission gear 34, and the first movable transmission gear 32 while the 90 rotates in synchronization.

Here, by switching the valve position of the hydraulic piping system, the hydraulic oil is discharged from the first working chamber 101 through, for example, the hydraulic passage 91, and the hydraulic passage 92 is transferred to the second working chamber 102.
When the hydraulic oil is supplied through the movable partition wall portion 96, the movable partition wall portion 96 rotates around the phase adjustment shaft 90 with the first phase adjustment gear 35 (for example, from the state shown in FIG. 5A to the state shown in FIG. 5B). . Therefore, the first phase adjusting gear 35 rotates relative to the second phase adjusting gear 36 to generate a phase difference therebetween, and in such a state, the first phase adjusting gear 35 and the second phase adjusting gear 35 are rotated. The gear 36 rotates integrally with the phase adjustment shaft 90.

Then, as described above, the first phase adjusting gear 3
When a phase difference occurs between the fifth and second phase adjustment gears 36,
The first and second movable transmission gears 32 and 34 are the first and second movable transmission gears.
Relative to the rotating shafts 21 and 22 of the first and second
, The first and second fixed eccentric weights 51A and 52A attached thereto, and the first and second movable eccentric weights 5 coupled to the first and second movable transmission gears 32 and 34.
1B and 52B, a phase difference is generated, whereby the vibrating force or amplitude applied to the casing member 20 via the first and second rotating shafts 21 and 22 is changed.

In this case, the first and second rotating shafts 21 and
2 each eccentric weight 51A, 52A, 51 attached to
The horizontal component of the centrifugal force generated in B and 52B is canceled, and the vertical component of the centrifugal force is added. This vertical component gives the casing member 20 a vertical vibrating force. And now, as shown in FIG. 7A, the positions of the first and second fixed eccentric weights 51A, 52A and the first and second movable eccentric weights 51B, 52B which are arranged coaxially. When the phase difference is 180 ° (for example, when one end of the movable partition wall portion 96 is in contact with one end of the fixed partition wall portion 95), as shown by curves a and b in FIG. The excitatory forces obtained from are offset to each other and become zero. On the other hand, the movable partition wall 96 is rotated by 180 ° about the phase adjustment axis 90 from the above state (for example, the other end of the movable partition wall 96 is fixed to the fixed partition wall 95).
7C), and as shown in FIG. 7C, the first and second fixed eccentric weights 51A, 52A and the first
And the phase difference between the coaxially arranged second movable eccentric weights 51B and 52B becomes 0, and as shown by a curve c in FIG. 8C, the vibrating force obtained by only one eccentric weight or A vibrating force of twice the amplitude is obtained.

[0025] Note that FIG. 8B, the phase difference indicates a case of 90 °, Fig. 8A, the amount of the sum of the excitation force or amplitude a and b as in the case of C, that, in FIG. 8 B The amount of vibrating force or amplitude shown by the curve c is obtained.

Therefore, for example, when the vibration generator 10 is activated, the first and second fixed eccentric weights 51A, 51A
If the phase difference between coaxial ones of the 2A and the first and second movable eccentric weights 51B and 52B is set to 180 ° as shown in FIG. 8A, a balanced flywheel is started. If the phase adjustment shaft 90 is moved so that the phase difference between them gradually decreases from 180 ° to 0 during the period from the start until the electric motor 14 reaches the rated rotation speed, a large condition can be obtained. Each eccentric weight can be smoothly rotated without requiring a large driving force, so that the electric motor 14 can sufficiently fulfill its role with a small-sized electric motor, and energy saving can be achieved. .

The first and second movable transmission gears 3
2, 34 and first and second movable eccentric weights 51B, 52B
Means that the eccentric weights and gears, and the arrangement of the first rotation shaft 21, the second rotation shaft 22, and the phase adjustment shaft 90 can be changed as appropriate. It is.

[0028]

As is apparent from the above description, according to the vibration generator of the present invention, at least one of the phase adjusting gears rotates relative to the phase adjusting shaft by supplying and discharging the fluid to and from the fluid working chamber, Since the pair of phase adjusting gears rotate integrally with the phase adjusting shaft in a state where a phase difference is generated, the first phase adjusting gears attached to the first and second rotating shafts to which one rotation of the pair of phase adjusting gears is transmitted. And a second fixed eccentric weight,
A phase difference is generated between the first and second movable eccentric weights coupled to the first and second movable transmission gears to which the other rotation of the pair of phase adjustment gears is transmitted, and thereby each eccentric weight is The vertical component forces generated in each of the eccentric weights are always canceled out, whereas the total value of the vertical component forces generated in each eccentric weight is the first and second fixed eccentric weights and the first and second movable eccentric weights. And, as a result, the vibrating force applied to the casing member via the first and second rotating shafts is changed, so that the vibrating force can be arbitrarily and even during operation. There is an advantage that it can be changed steplessly, and the structure is extremely simple, reasonable and easy to manufacture.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of a vibration generator according to the present invention.

FIG. 2 is a developed view showing a main part of an embodiment of the vibration generator according to the present invention.

FIG. 3 is a detailed view of a main part of the embodiment shown in FIGS. 1 and 2;

FIG. 4 is a diagram which is used for describing the operation of the embodiment shown in FIGS. 1 and 2.

FIG. 5 is a diagram for explaining the operation of the embodiment shown in FIGS. 1 and 2;

FIG. 6 is a front view showing an example of a vibration pile driver to which the vibration generator of the embodiment shown in FIGS. 1 and 2 is applied;

FIG. 7 is a diagram which is used for describing the operation of the embodiment shown in FIGS. 1 and 2.

FIG. 8 is a diagram which is used for describing the operation of the embodiment shown in FIGS. 1 and 2.

[Explanation of symbols]

 10 Vibration generator 14 Motor 20 Casing member 21 First rotating shaft 22 Second rotating shaft 31, 33 Fixed transmission gear 32, 34 Movable transmission gear 35, 36 Phase adjustment gear 51A, 52A ─Fixed eccentric weight 51B, 52B─Movable eccentric weight 90─Phase adjustment shaft 91,92-Hydraulic passage 95-Fixed partition wall 96-Movable partition wall 100-Hydraulic working chamber 101-First working chamber 102- Second working chamber

Claims (2)

(57) [Claims] 1. A first fixed transmission gear and a first fixed eccentric weight are externally fitted and fixedly supported by a casing member, and the first movable transmission gear and a first fixed eccentric weight connected to the first fixed eccentric weight.
A first rotating shaft on which the movable eccentric weight is externally rotatably fitted, and a second rotating shaft supported by the casing member in parallel with the first rotating shaft and meshing with the first fixed transmission gear. The fixed transmission gear and the second fixed eccentric weight are externally fitted and fixed, and the second movable transmission gear meshed with the first movable transmission gear, and the second movable eccentric weight coupled to the gear A second rotation shaft externally fitted so as to be relatively rotatable, and a phase adjustment shaft rotatable in parallel with the first and second rotation shafts, at least one of which prevents axial movement of the phase adjustment shaft. A pair of gears, one of which engages with one of the first and second fixed conductive gears and the other meshes with one of the first and second movable conductive gears. A phase adjustment gear, and an outer peripheral portion of the phase adjustment shaft and the phase adjustment A fluid working chamber is formed between the vehicle and one of the vehicles, and the phase adjustment gear is configured to rotate relative to the phase adjustment shaft by supplying and discharging fluid to and from the fluid working chamber. Vibration generator. 2. The vibration generation according to claim 1, wherein the fluid working chamber is partitioned by a fixed partition wall fixed to the phase adjustment shaft and a movable partition wall fixed to the phase adjustment gear. apparatus.