JPH086826Y2 - Exciter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an oscillating device provided in a pile driving machine, a ground compacting machine, or the like and capable of variably adjusting the eccentric moment during operation. This is an improvement to the method of arranging the movable eccentric weight with respect to the weight.

[Conventional technology]

Japanese Unexamined Patent Publication (Kokai) No. 63-181814 discloses a vibration exciter of this type, in which a fixed eccentric weight and a movable eccentric weight are attached to a pair of rotating shafts that rotate in opposite directions, and the fixed eccentric weight is used during operation. The eccentric moment is changed by changing the phase angle between the weight and the movable eccentric weight.

Especially, by making the eccentric moment at startup almost zero, it is possible to reduce the starting force of the pile driving machine and to resonate with the crane of the pile driving machine and the surrounding houses. The goal is to enable quick passage.

[Problems to be solved by the device]

However, in the phase angle variable mechanism seen in the above-mentioned conventional example, a phase adjustment shaft and a phase adjustment gear are provided between the fixed eccentric weight and the movable eccentric weight outside the rotating shaft, and the phase adjustment gear rotates to rotate. The phase angle with the fixed eccentric weight is changed by rotating the eccentric weight around the rotation axis.

Therefore, in addition to the rotating shaft, it is necessary to insert and support the phase adjustment shaft in the fixed eccentric weight and to mesh the phase adjustment gear with the movable eccentric weight. However, the assembling of the phase adjusting shaft and the phase adjusting gear is complicated, and it is not easy to machine the gear teeth on the outer periphery of the movable eccentric weight. This leads to higher overall costs.

In particular, even in the above-mentioned conventional example, the two sets of the fixed eccentric weight and the movable eccentric weight have the same material and the same shape in plan view, and only the thickness width of the movable eccentric weight is equal to that of the fixed eccentric weight. It is set to almost double. This is because by selecting the phase angle of the fixed and movable eccentric weights, it is easy to cancel the respective exciting forces and adjust the eccentric moment to zero. However, the conventional phase adjustment shaft and phase adjustment gear are located outside the axis of the rotary shaft. In this case, the eccentric moment in question is determined by the weight of the weight multiplied by (the eccentric distance from the center of gravity of the weight and the shaft center of the rotary shaft), so the position of the phase adjustment shaft and the phase adjustment gear deviated from the rotation shaft. Since it is arranged in the above, it is extremely difficult to adjust the eccentric moment to zero as ideal, and it is almost impossible. It is theoretically possible to change the shape of each weight and adjust each center of gravity, but it is impossible in actual production.

Such a problem can be solved by the pile driver disclosed in Japanese Patent Publication No. 39-4142. In this conventional example, the phase angle with the fixed eccentric weight is changed by rotating the movable eccentric weight around the rotation axis by the cylinder and the screw feed mechanism. It is easier to assemble than a variable phase angle mechanism using a combination of phase adjusting gears, and the eccentric moment can be adjusted relatively easily.

However, also in this case, both the fixed eccentric weight and the movable eccentric weight are mounted side by side in the axial direction on the rotating shaft as in the conventional example described above, and the eccentric moment is changed from zero to the maximum. Therefore, it is necessary to rotate the movable eccentric weight 180 degrees with respect to the fixed eccentric weight so that the movable eccentric weight completely overlaps the fixed eccentric weight when viewed from the axial direction.
In order to rotate the movable eccentric weight by 180 degrees around the rotation axis, it is necessary to use a long cylinder and screw feed axis, and the vibration oscillating device becomes large and heavy, which requires a large crane. To do.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to improve a phase angle varying mechanism in an exciter having a phase angle varying mechanism so as to simplify the mechanism and facilitate assembly.

Another object of the present invention is to obtain an oscillating device equipped with a phase angle varying mechanism capable of easily and surely adjusting the eccentric moment.

Still another object of the present invention is to reduce the size and weight of the vibration oscillating device by devising the arrangement of the fixed eccentric weight and the movable eccentric weight on the rotating shaft.

[Means for solving the problem]

As shown in FIG. 1, the vibrating device of the present invention comprises at least a pair of parallel rotating shafts 2 which rotate in opposite directions,
A fan-shaped fixed eccentric weight 6 having a central angle of 90 °, a movable eccentric weight 7 having the same fan shape, and a fixed eccentric weight 6 and a movable eccentric weight, which are respectively arranged at the same position on each rotation shaft 2. And a phase angle changing mechanism 8 for changing the phase angle with respect to 7.

Each of the fixed eccentric weights 6 has a fan-shaped central portion having an axial hole and is provided with a thin-walled boss portion 6a in the axial direction. The boss portion 6a is configured to prevent the rotation shaft 2 from rotating through the axial hole. It is inserted and fixed.

Each movable eccentric weight 7 is provided with a bifurcated boss portion 7a having a shaft hole in the center of a fan, and the boss portion 7a is inserted into the rotary shaft 2 through the shaft hole to form the fixed eccentric weight 6 Of the boss 6a
It is fitted on.

The movable eccentric weight 7 with respect to the fixed eccentric weight 6 has a phase angle P of 0 degree as shown in FIG. 4 and a position where the eccentric moment is maximum, and a phase angle P of 90 degree as shown in FIG. The eccentric moment can be rotated about the rotation axis 2 over a position where the eccentric moment is zero.

The variable phase angle mechanism 8 includes a movable eccentric weight 7 on each rotary shaft 2.
And an inner slide screw tube 11 that is axially movable and inserted in a non-rotating manner, and an outer slide that is fitted onto the inner slide screw tube 11 and has one end connected to the boss portion 7a of the movable eccentric weight 7. The screw tube 12 and the thrust adding means 15 for forcibly moving the inner slide screw tube 11 in the axial direction of the rotary shaft 2. Then, the male screw 10 is provided on the outer periphery of the inner slide screw tube 11,
A female screw 13 that meshes with the male screw 10 is provided on the inner circumference of the outer slide screw tube 12.

[Action]

When the thrust force applying means 15 forcibly moves the inner slide screw pipe 11 in the axial direction, the outer slide screw pipe 12 becomes a double screw pipe 11.
By rotating the movable eccentric weight 7 by rotating with the engagement of the 12 male and female screws 13 and 10, the phase angle P between the movable eccentric weight 7 and the fixed eccentric weight 6 can be changed from zero to more. .

The inner and outer slide screw tubes 11 and 12 which are the components of the phase angle varying mechanism 8 are literally tubes, that is, cylindrical.
This is because these are positioned concentrically with the axis of each rotary shaft 2.

[Effect of device]

According to the vibration oscillating device of the present invention, the variable phase angle mechanism 8 is composed of the inner and outer slide screw tubes 11 and 12 formed by engaging the male and female screws 13 and 10 with each other. The simple assembly of inserting it is enough. Therefore, as compared with the conventional phase angle changing mechanism using the combination of the phase adjusting shaft and the phase adjusting gear, the mechanism and the assembly can be simplified, and the cost can be reduced.

Since the inner and outer slide screw tubes 11 and 12 are positioned concentrically with the axis of the rotary shaft 2, when the eccentric moment is shifted to zero, the fixed and movable eccentric weights 6 and
Even if no special consideration is given to the shape of 7, the eccentric moment can be easily and surely made zero by keeping these centers of gravity constant, and the weight 6
The rotation of No. 7 can be started, and the passage of the pending resonance point can be quickly performed, which is also effective in preventing noise.

In particular, in order to change the eccentric moment from zero to maximum by disposing the fan-shaped fixed eccentric weight 6 having the central angle of 90 ° and the movable eccentric weight 7 having the same shape at the same position on the rotary shaft 2,
It is sufficient that the movable eccentric weight 7 is rotated within the range of 90 degrees with respect to the fixed eccentric weight 6. Therefore, since the fixed eccentric weight 6 and the movable eccentric weight 7 are located at the same position on each rotary shaft 2, the rotary shaft 2 is not overloaded. In addition, the cylinder 19 of the thrust applying means 15 and the inner and outer slide screw pipes 11 and 12 are much shorter than the conventional one in which the movable eccentric weight 7 needs to be rotated 180 degrees with respect to the fixed eccentric weight 6. Therefore, there is an advantage that the whole vibration oscillating device can be reduced in size and weight and can be applied to a small crane.

Further, the fixed eccentric weight 6 has a fan-shaped central boss portion 6a thin in the axial direction, while the movable eccentric weight 7 has a fan-shaped central boss portion 7a in a bifurcated shape. The fixed eccentric weight 6 is rotatably fitted on the boss portion 6a. Therefore, it is possible to reliably prevent the boss portions 6a, 7a at the center where the fixed eccentric weight 6 and the movable eccentric weight 7 are connected from being broken by a couple of forces due to the centrifugal force, and to improve durability. Excel.

[Embodiment] An embodiment of an oscillating device according to the present invention is shown in Figs.
A description will be given based on the figure.

In FIG. 1 and FIG. 2, two rotary shafts 2 are rotatably supported in a vibrating box 1 in parallel via bearings 3, respectively. One end of one of the rotary shafts 2 is projected from the vibration generator box 1 and the pulley 4 is fixed thereto. The two rotary shafts 2 are connected to each other via tuning gears 5 fixed to their ends and meshed with each other, and can be rotationally driven in opposite directions via a pulley 4 by a motor (not shown).

A fan-shaped fixed eccentric weight 6 with a central angle of 90 ° when viewed from the axial direction at the same position on each rotary shaft 2
And the same fan-shaped movable eccentric weight 7 are radially arranged such that the boss portions 6a and 7a of both are overlapped with each other.

Specifically, the fixed eccentric weight 6 has a shaft hole at the center of its fan-shaped portion and is provided with a thin-walled boss portion 6a in the axial direction, and the boss portion 6a is provided through the shaft hole to rotate the rotary shaft. 2 and is fixed to the rotary shaft 2 through a key 9 (or spline) in a rotation-stop manner.

On the other hand, the movable eccentric weight 7 is provided with a bifurcated boss portion 7a having a shaft hole at the center of its fan-shaped portion, and the boss portion 7a is inserted into the rotary shaft 2 through the shaft hole to provide a fixed eccentric weight. It is fitted onto the boss portion 6a of 6 and is laminated in a sandwich shape so that the shaft holes of both 6a and 7a are aligned.

As a result, the movable eccentric weight 7 comes into contact with the fixed eccentric weight 6 at a position where the eccentric moment is zero by separating the fixed eccentric weight 6 from the fixed eccentric weight 6 by 90 ° as shown in FIG. The eccentric moment is maximized and the eccentric moment is maximized. Each of the fixed eccentric weights 6 and each of the movable eccentric weights 7 are formed of the same material and have the same planar shape in order to facilitate manufacturing.

The phase angle between the fixed eccentric weight 6 and the movable eccentric weight 7 can be changed by the phase angle varying mechanism 8. The phase angle changing mechanism 8 is located on the side opposite to the tuning gear 5 side of the movable eccentric weight 7 on each rotating shaft 2 (on the left side in FIG. 1), and first, an inner slide having an external thread 10 cut on the outer circumference. The threaded tube 11 is inserted through a key 9a (or a spline) so as to be axially movable and non-rotatable. Next, the outer slide screw tube 12 in which the female screw 13 that meshes with the male screw 10 is cut is inserted into the outer periphery of the inner slide screw pipe 11 by engaging both screws 10 and 13 with each other. For these female and male screws 13 and 10, square screws or trapezoidal screws with low friction are used. Thus, one end of the outer slide screw tube 12 is connected to the boss portion 7a of the movable eccentric weight 7 by the bolt 14. Incidentally, each of the inner slide screw tube 11 and the outer slide screw tube 12 is formed of a truly cylindrical tube.

The inner slide screw tube 11 can be forcibly moved in the axial direction by the thrust applying means 15. As the thrust adding means 15, a slide bearing 16 is provided on a slide plate 16 in which one end portion (the left end portion in FIG. 1) of the inner slide screw tube 11 is inserted into the rotary shaft 2.2.
And the slide plate 16 was connected to the rod 20 of the cylinder 19 mounted on the outside of the vibrator box 1.

Now, the rotating force transmitted to the pulley 4 rotates one of the rotating shaft 2, the tuning gear 5, and the inner slide screw tube 11, and the other rotating shaft 2 and the fixed eccentric weight 6 are rotated via the tuning gear 5. . On the other hand, when the rod 20 of the cylinder 19 is fixed so as not to move, the rotational force causes the outer slide screw tube 12 and the movable eccentric weight 7 to rotate at the same speed via the male screw 10 of the inner slide screw tube 11.

Stroke of cylinder 19 and inner / outer slide screw tube 11.
If the pitches of the male and female screws 13 and 10 of 12 are matched and the phase of the fixed eccentric weight 6 and the movable eccentric weight 7 is shifted by a predetermined angle P in one stroke of the cylinder rod 20, the cylinder 10
The eccentric moment changes from zero to maximum by moving.

That is, FIG. 2 shows a state in which the phase angle P is 90 ° and the eccentric moment is zero, FIG. 3 shows a state in which the phase angle P is 45 ° and the eccentric moment is in an intermediate state, and FIG. 4 shows the phase angle P is 0 °. , Shows the maximum eccentric moment.

The male and female threads 13 and 10 have a maximum pitch of 1/4 (angle 90 °).
Since the eccentric moment becomes maximum from 0, cylinder 19
The stroke is short.

[Another embodiment]

As the thrust applying means 15, a motor and a screw feed mechanism may be combined instead of the cylinder 19. The rotating shaft 2 can be an even number of two or more.

[Brief description of drawings]

FIGS. 1 and 4 show an embodiment of a vibrating device according to the present invention. FIG. 1 is a sectional view showing an internal structure, FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view showing a state in which the eccentric moment is changed to an intermediate state corresponding to FIG. 2, and FIG. 4 is a state in which the eccentric moment is changed to the maximum.
It is sectional drawing shown corresponding to a figure. 2 ... Rotary shaft, 6 ... Fixed eccentric weight, 7 ... Movable eccentric weight, 8 ... Eccentric moment variable mechanism, 10 ... Screw, 11 ...
… Inner slide screw tube, 12 …… Outer slide screw tube, 13 ……
Screw, 15 …… Thrust adding means, 16 …… Slide plate, 20 ……
Cylinder.

Claims (1)

[Scope of utility model registration request] 1. At least a pair of parallel rotating shafts (2) rotating in opposite directions, and a fan-shaped fixed eccentricity having a central angle of 90 °, which are arranged at the same position on each rotating shaft (2). A weight (6) and a movable eccentric weight (7) having the same fan shape as the weight, and a variable phase angle mechanism (8) for changing the phase angle between the fixed eccentric weight (6) and the movable eccentric weight (7). Each fixed eccentric weight (6) has an axial hole at the center of the sector and is provided with a thin-walled boss portion (6a) in the axial direction, and this boss portion (6a) forms the axial hole. The movable eccentric weight (7) is fixed to the rotary shaft (2) through a rotation stopper, and each movable eccentric weight (7) is provided with a bifurcated boss (7a) having a shaft hole at the center of the fan. The portion (7a) is inserted into the rotary shaft (2) through the shaft hole and is fitted onto the boss portion (6a) of the fixed eccentric weight (6). ), The movable eccentric weight (7) rotates between the position where the phase angle (P) is 0 ° and the eccentric moment is maximum, and the position where the phase angle (P) is 90 ° and the eccentric moment is zero. The phase angle varying mechanism (8) is rotatable around the shaft (2) and is movable along the movable eccentric weight (7) on each rotating shaft (2) in the axial direction and is inserted in a non-rotating manner. An inner slide screw pipe (11), and an outer slide screw pipe (12) externally fitted to the inner slide screw pipe (11) and one end of which is connected to the boss portion (7a) of the movable eccentric weight (7), And a thrust adding means (15) for forcibly moving the inner slide screw tube (11) in the axial direction of the rotating shaft (2), wherein the inner slide screw tube (11) is provided with a male screw (10) on the outer periphery, On the inner circumference of the slide screw tube (12), the male screw (10)
An oscillating device, characterized in that it is provided with a female screw (13) that meshes with.