JPS63181814A - Vibrator - Google Patents

Abstract

PURPOSE:To improve the efficiency of energy by using a system in which the adjustment of the phase angle between a movable eccentric weight and a fixed eccentric weight can be made even for every rotary shaft. CONSTITUTION:In driving a vibrator, a rod 26 is retracted and the phase angle between movable eccentric weights 13a and 13b and fixed eccentric weights 12a-12d is regulated to 180 deg.. When operating a motor under the condition, the drive force is given through a pulley 7 to rotary shafts 9a and 9b, and thereby the weights 13a, 13b, and 12a-12d are rotationally driven, where they begin to turn by small drive forces due to the existence of the weights 13a, 13b, and 12a-12d on a relative position where vibrating forces are mutually nagated. When the rotation of the shafts 9a and 9b reaches a periodic speed, the rod 26 of the cylinder 25 is advanced. The phase angle between the weights 13a and 13b and the weights 12a-12d becomes gradually smaller finally to reach 90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vibrating machine that can adjust the vibration force, and is applicable to pile driving, pile extraction, and the like.

(Prior Art) Conventional vibration exciters used in civil engineering construction work, etc. are as shown in, for example, Japanese Patent Laid-Open No. 58-26118.
An eccentric weight is fixed to a pair of parallel rotating shafts,
The respective rotating shafts are connected by a synchronized gear and rotated in opposite directions, thereby adding the vibration-exciting force generated by each eccentric weight in a fixed direction to obtain a predetermined vibration.

(Problem to be solved by the invention) However, in the above-mentioned vibration exciter, since the eccentric weight is fixed to the rotating shaft, the excitation force is always constant when the rotating shaft is rotating at the rated speed. There is a disadvantage that it is constant and cannot be changed. Also.

At the rated state, the eccentric weight continues to rotate with large inertia, so rotation can be sustained by supplying the driving force equivalent to the energy consumed by vibration. A large driving force is required to move the weight, so a driving source with a large output (such as a motor) is required.
However, it also had the disadvantage that it was difficult to save energy.

Therefore, an object of the present invention is to provide an energy-efficient exciter in which the excitation force can be adjusted for each rotating shaft.

(Problems to be Solved by the Invention) Therefore, the gist of the present invention is to provide a rotating shaft to which a fixed eccentric weight is attached, a movable eccentric weight rotatably fitted on the rotating shaft, a phase adjustment shaft movable along the axial direction of the rotating shaft provided on the fixed eccentric weight;
The phase adjustment gear has a phase adjustment gear rotatably fitted on the phase adjustment shaft and connected to the movable eccentric weight, and a thrust applying means for forcibly moving the phase adjustment shaft in the axial direction. The fixed eccentric weight and the movable eccentric weight are formed by forming a shaped groove and providing a guide pin slidably engaged with the groove on the phase adjustment gear, and moving the phase adjustment shaft in the axial direction. The reason is that the phase angle between the two is adjusted.

(Function) Therefore, it is possible to change the phase angle between the fixed eccentric weight and the movable eccentric weight at any time, and in particular, when driving, the closer the phase angle is to 180 degrees, the smaller the driving force can be used to drive, so the output is small. The driving source is sufficient, so
It is possible to achieve the above purpose.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the exciter includes a main body 1 in which an excitation force generator is housed, and a chuck 2 attached to the lower end of the main body 1.
and a motor storage case 4 that stores a motor 3 fixed to the upper end of the main body 1, and is hung by hooking a hanging tool 5 formed on the upper end of the main body 1 to a crane or the like. Then, the motor 3 is connected to the main body 1 via a transmission belt 6.
By connecting to a pulley 7 protruding from the chuck 2 and driving the motor 3, driving force is applied to the vibration force generator via the pulley 7, and the pile 8 etc. held by the chuck 2 is driven into the soil. This vibration force generator generates the necessary vibrations.

The excitation force generator is 1. As details thereof are shown in FIG. 1, two rotating shafts 9a and 9b are supported in parallel to the main body 1 via bearings 10, and one of the rotating shafts 9a has one end protruding from the main body 1. It is connected to pulley 7. Both of these rotating shafts 9a and 9b are connected via synchronized gears lla and llb fixed to their respective rear portions, so that when the motor 3 rotates, they are rotated in opposite directions at the same angular velocity. ing. In addition, two fixed eccentric weights 12 are attached to each rotating shaft 9a, 9b.
a to 12d are fixed, and these fixed eccentric weights 12a to 1
Between 2d is a movable eccentric weight 13a.

13b is rotatably fitted onto the outside via a bush 14.

Fixed eccentric weights 12a and 12b attached to the same rotating shaft
, 12c and 12d are the weights 12a to 12d and the rotating shaft 9.
A and 9b are positioned in the circumferential direction by a key 15 interposed between them so that they are in the same phase with each other, and as shown in FIG. The phase adjustment shaft 1 is inserted into the through hole 16 formed near the side.
7a.

17b is inserted through the bush 18 parallel to the rotating shafts 9a, 9b.

On the other hand, the movable eccentric weights 13a and 13b are made of the same material and have the same planar shape as the fixed eccentric weights 12a to 12j, and have a thickness width approximately twice that of the fixed eccentric weights.

Moreover, this movable eccentric weight 13a.

A partially toothed gear 20 is formed on the outer peripheral surface of the gear 13b, and this partially toothed gear 20 meshes with phase adjustment gears 21a and 21b that are rotatably fitted onto the phase adjustment shafts 17a and 17b.

The movable eccentric weight 13a and fixed eccentric weights 12a, 12b of one rotating shaft 9a are the same as the movable eccentric weight 13a and fixed eccentric weight 12c of the other rotating shaft 9b.

It is provided mirror-image-symmetrically with respect to 12d.

A spiral groove 22 is formed on the outer peripheral surface of the phase adjustment shafts 17a, 17b, and phase adjustment gears 21a, 21b
A guide pin 23 is slidably engaged with this groove 21.
are attached near both ends of the gears 21a, 21b. This groove 22 is cut symmetrically between one phase adjustment shaft 17a and the other phase adjustment shaft 17b, so that the phase adjustment gears 21a and 21b
a.

17b moves in its axial direction, the guide pin 23 moves into the groove 2.
2 and rotate in opposite directions. The phase adjustment shafts 17a and 17b are
The stroke of the movable eccentric weight 13a is regulated by the thrust adding means described below.

13b and the fixed eccentric weights 12a to 12d are continuously adjusted.

The thrust adding means is provided with a cylinder 25 equipped with an automatic locking device on the outside of the main body 1, a rod 26 of this cylinder 25 protrudes into the main body 1, and a thrust adding plate 27 at the tip of the rod 26.
It is configured by fixing it.

This thrust adding plate 27 has hollow annular spaces 28 a and 28 b provided around both rotating shafts 9 a and 9 b, and the thrust adding plate 27
0 phase adjustment shaft 1 into which one end of the phase adjustment shafts 17a and 17b described above is inserted through an annular hole 29 formed on the surface of
A hard-wearing butt 31 is attached to one end of 7a and 17b via a sleeve 30.
Therefore, one end of the phase adjustment shafts 17a and 17b is connected to the thrust adding plate 2.
7, and the annular spaces 28a, 28
b can be rotated along the annular hole 29.

As a result, when the rod 26 is in the retracted state, 1
The phase adjustment shafts 17a and 17b are located on the right side of Fig. 1 (
), in this state, the movable eccentric weight 13
a and 13b are 18 for the fixed eccentric weights 12a to 12d.
It is at a position shifted by 0 degrees and the moment is zero (
Figure 3).

Further, the rod 26 extends to the phase adjustment shaft 17a.

17b is pushed by the thrust adding plate 27 and moved to the right by a predetermined stroke length (indicated by the broken line in FIG. 1), the movable eccentric weights 13a and 13b are replaced by the fixed eccentric weight 12a
~12d is in a position shifted by 90 degrees (Fig. 4).

Note that 32 is a guide plate that holds the thrust adding plate 27.

In the above-described configuration, when driving the exciter, first, the rod 26 is set in a retracted state, and the movable eccentric weight fi1
3a, 13b and the fixed eccentric weights 12a to 12d have a phase angle of 180 degrees. When the motor 3 is driven in this state, the driving force is transmitted through the conductive belt 6 and pulley 7 to the tuning gear 11a.

Movable eccentric weights 13a, 13b and fixed eccentric weight 12a are provided to both rotating shafts 9a, 9b connected by 11b.
~12d is rotationally driven. On this occasion.

Movable eccentric weights 13a, 13b and fixed eccentric weights 12a-1
2d are in relative positions that cancel out their respective excitation forces, and therefore, when driven, rotation is started with a small driving force.

Next, when the rotations of the rotating shafts 9a and 9b reach the synchronous speed, the rod 26 of the cylinder 24 is moved forward. Then, the first phase adjustment shafts 17a and 17b are pushed forward by the thrust adding plate 27, and the phase adjustment gear 21a is moved forward.

21b rotates, the phase angle between the movable eccentric weights 13a, 13b and the fixed eccentric weights 12a to 12d gradually decreases,
Eventually it will reach 90 degrees. At this time, the movable eccentric weight 13a,
13b and the fixed eccentric weights 12a to 12d are gradually added in the vertical direction as the phase angle becomes smaller, the amplitude of the vibration becomes larger, and a predetermined vibration can be obtained.

In addition, for component forces other than the vertical direction, both rotating shafts 9a
, 9b are rotated at the same time in opposite directions by the rotating speed dust, so they cancel each other out.

Conversely, when stopping the exciter, the cylinder 25
The rod 26 of the movable eccentric weights 13a and 13b is moved backward.
The phase angle between the fixed eccentric weights 12 a to 12 d is 18
It is sufficient to return the temperature to 0 degrees, eliminate the vibration of the exciter, and stop the motor 3 in that state.

In this embodiment, the phase angle is continuously varied within the range of 180 degrees to 90 degrees, but the strokes of the phase adjustment shafts 17a and 17b may be increased to vary the phase angle close to zero. .

The lead angle of the spiral groove 22 may be changed.

(Effects of the Invention) As described above, according to the present invention, the phase angle between the movable eccentric weight and the fixed eccentric weight can be adjusted at any time for each rotating axis. It is possible to provide an energy-efficient exciter that can adjust the vibration force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the internal structure of the exciter in this invention, FIG. 2 is a front view showing the external appearance of the exciter in this invention, and FIGS. 3 and 4 are A-A in FIG. 1. 3 shows a state in which the phase angle between the movable eccentric weight and the fixed eccentric weight is 180 degrees, and FIG. 4 shows a state in which the phase angle is 90 degrees. 9a, 9b...Rotating shaft, 12a-12d...Fixed eccentric weight, 13a, 13b...Movable eccentric weight, 17a,
17b"・Phase adjustment shaft, 21a, 21b"・Phase adjustment gear, 22...Groove, 23...Guide pin, 25...
・Cylinder, 26...Rod, 27...Thrust addition plate. Procedural Amendment Document 1. Indication of the case 1986 Patent Application No. 10352 2, Name of the invention Exciter 3, Person making the amendment Relationship to the case Patent applicant address 2-1-11-604 Shibaura, Minato-ku, Tokyo Name Harmony Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] 1. A rotating shaft to which a fixed eccentric weight is attached, a movable eccentric weight rotatably fitted onto the rotating shaft, and an axis of the rotating shaft provided on the fixed eccentric weight. A phase adjustment shaft that is movable along the direction, and a phase adjustment shaft that is rotatably fitted on the outside of the phase adjustment shaft.
It has a phase adjustment gear connected to the movable eccentric weight, and a thrust applying means for forcibly moving the phase adjustment shaft in the axial direction, and a spiral groove is formed in the phase adjustment shaft and the phase adjustment gear is A guide pin slidably engaged with the groove is provided, and the phase angle between the fixed eccentric weight and the movable eccentric weight is adjusted by moving the phase adjustment shaft in the axial direction. Characteristic exciter. 2. The thrust adding means is comprised of a cylinder and a thrust adding plate attached to a rod of the cylinder that locks one end of the phase adjustment shaft. exciter.