JPH0541761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration generator for a vibrating roller used in compaction work of dams, reclaimed land, roads, etc.

(Prior art) A vibrating roller used for compaction work on dams, reclaimed land, roads, etc. has a vibration generator that selectively generates strong vibrations and weak vibrations in the drum of the front wheel. The drum is vibrated with high amplitude when the vibration is strong and with low amplitude when the vibration is weak.
It is now used to compact compaction materials such as asphalt.

In general, the relationship between the vibration amplitude of the drum and the compaction effect is that when the drum is vibrated at high amplitude, the vibration is transmitted deep into the material to be compacted, as shown by curve A in Figure 11, and powerful compaction can be performed. If the vibration is too strong at high amplitudes, the surface layer of the compacted material is destroyed, making it difficult to compact. Conversely, when vibrating at low amplitudes, the vibrations are not transmitted deep into the compacted material, as shown by curve B. It is known that only the surface layer of the compacted material can be compacted.

Therefore, in the past, it was necessary to use low-amplitude and high-amplitude vibrations to obtain a uniform degree of compaction from the surface layer to the deep layer. After that, the vibration generator inside the drum is switched to low amplitude vibration, and the drum is vibrated at low amplitude to compact the surface layer.

(Problems to be Solved by the Invention) As described above, the drum is vibrated at a high amplitude to compact the deep part of the compacted material, and then the drum is vibrated at a low amplitude to compact the surface layer. , 1st
As shown in Figure 2, the compaction work involved two steps, resulting in a problem of low work efficiency.

In addition, when the drum is vibrated at a higher amplitude in order to shorten the compaction time of the compaction material, the surface layer is destroyed due to the strong vibration, making it impossible to sufficiently increase the density of the roadbed, and the particle size cannot be adjusted. The crushed stone will crack and the particle size distribution will be disturbed, resulting in a decrease in the quality of compaction.

(Means for Solving the Problems) A vibration generator for a vibrating roller according to the present invention is a vibration generator for adding vibration to a drum of a vibrating roller. a first vibration shaft having a first eccentric weight for generating high-amplitude vibrations that vibrates with high amplitude; and a first vibration-exciting shaft having a first eccentric weight for generating high-amplitude vibrations that is arranged within the drum in parallel with the drum axis and vibrating the drum with low amplitudes. a second vibration generating shaft having a second eccentric weight; a first driving means for rotationally driving the first vibration generating shaft; and a first driving means for rotationally driving the first vibration generating shaft; A second driving means for rotationally driving the shaft at a higher speed than the first vibration generating shaft is provided.

(Function) In the vibration generating device for a vibrating roller according to the present invention, when the first vibration generating shaft in the drum is driven by the first driving means, high amplitude vibration is applied to the drum due to the rotation of the first eccentric weight. However, in parallel with this, when the second vibration generating shaft is rotationally driven at a higher speed than the first vibration generating shaft by the second driving means, low amplitude vibrations also act on the drum due to the rotation of the second eccentric weight. .

Therefore, the vibration of the drum becomes a composite vibration that is a combination of low-amplitude vibration and high-amplitude vibration, and this low-amplitude vibration component at a high rotational speed compacts the surface layer or surface part of the compacted material, and the high-speed vibration at a low rotational speed. The deep part of the compacted material is compacted by the amplitude vibration component.

Here, the high-amplitude vibration components propagate deep into the roadbed through the surface layer compacted with low-amplitude vibration components, so there is less damage to the surface layer, and the high-amplitude vibration components efficiently propagate deep into the roadbed from the surface layer. Evenly compacted deep down.

(Effect of the invention) According to the vibration generator for a vibrating roller of the present invention,
As explained above, compound vibration is added to the drum, which is a combination of high-amplitude vibration at a low rotational speed caused by the first eccentric weight and low-amplitude vibration caused by the second eccentric weight whose rotational speed is higher than this high-amplitude vibration. Therefore, surface compaction work using low amplitude vibrations and deep compaction work using high amplitude vibrations can be performed in parallel, reducing work time and greatly improving work efficiency.

Moreover, since high-amplitude vibration components are transmitted deep into the compacted material through the surface layer compacted with low-amplitude vibration components, crushed stone near the surface layer is less likely to be broken.
It is compacted uniformly from the surface layer to the deep layer, achieving high compaction quality.

These can greatly improve work efficiency and compaction quality.

(Example) Hereinafter, preferred examples of the present invention will be described based on the drawings.

The vibrating roller 1 has a cylindrical steel drum 2 as a front wheel as shown in FIG.
A driver's seat 6 is provided at the center of the vehicle body 4, and tire wheels 7 are provided at the rear.

As shown in FIG. 2, the drum 2 includes a cylindrical drum body 2a and a pair of left and right discs spaced apart from each other in the left and right sides of the drum body 2a and welded to the inner peripheral surface of the drum body 2a. The ribs 8a and 8b on the right side have a support shaft member 12b on the outer surface of the central part of the rib 8b that supports the right end of the vibration generator V, which will be described later.
is fixed concentrically with the drum 2, and the rib 8b
A rubber support plate 10 is attached to the outer surface of the
is fixed to the rubber support plate 10, and an output portion 11a of a traveling motor 11 (hydraulic motor or electric motor) fixed to the support bracket 5 is fixed. By driving the motor 11 forward or backward, the drum 2 is rotated and the vibrating roller 1 is moved forward or backward.

A support shaft member 12a is provided on the outer surface side of the left rib 8a.
is fixed concentrically with the drum 2, and this support shaft member 1
A sleeve shaft 12 is concentrically bolted to the left side of 2a through a ring gear 25, and a pivot member 14 that supports the sleeve shaft 12 through two sets of ball bearings 13 is mounted on the sleeve shaft 12. The pivot member 14 is welded to a rubber support plate 16 fixed to the support bracket 5b via a vibration-proof rubber 9.

Next, a description will be given of a vibration generator V which is installed in the center of the drum 2 concentrically with the drum 2 and is used to apply vibrations to the drum 2.

The vibration generator V includes a cylindrical first vibration shaft 18 whose ends are supported by left and right support shaft members 12a, 12b via a pair of bearings 17 on left and right ribs 8a, 8b, A second vibration shaft 20 whose both ends are supported inside the shaft 18 via a pair of bearings 19, and each vibration shaft 18, 20 are connected to a planetary gear mechanism 21.
and a first eccentric weight 2 provided at both ends of the first vibration shaft 18.
3 is formed to have a larger eccentric moment than the second eccentric weight 24 provided at the center of the second vibration axis 20.

The planetary gear mechanism 21 transmits the rotational force of the output shaft of the vibration motor 22 to the first vibration shaft 18 at a constant speed, and increases the speed of the rotational force at a predetermined speed increase ratio to the second vibration shaft. A carrier 27 that supports a planetary gear 26 that meshes with the inside of a ring gear 25 is connected to the output shaft 2 of the vibration motor 22.
8 via a coupling ring 29, the carrier 27 is connected to the left end of the first vibration shaft 18, and the sun gear 31 is connected to the left end of the second vibration shaft 20. The vibration shaft 20 is configured to be rotated at a higher speed than the first vibration generating shaft 18.

In addition, in the vibration generator V described above, the driving means for driving the first vibration generating shaft 18 and the driving means for driving the second vibration generating shaft 20 are connected to a common vibration motor 22 and a planetary planet. It is composed of a gear mechanism 21.

In the above-mentioned vibration generator V, when the vibration motor 22 rotates, the second vibration shaft 20 having the eccentric weight 24 with a small eccentric moment rotates at high speed via the planetary gear device 21, and generates a high-frequency low voltage to the drum 2. In addition to the amplitude vibration acting on the drum 2, low frequency high amplitude vibration acts on the drum 2 due to the rotation of the first vibration generating shaft 18 having the eccentric weight 23 having a large mass, so the vibration of the drum 2 is as shown in FIG. In this case, a high-frequency, low-amplitude vibration and a low-frequency, high-amplitude vibration are combined to form a complex vibration.

When the vibrating roller 1 is run on the upper surface of the compaction material 34 while vibrating the drum 2 with a composite vibration that is a combination of low amplitude vibration and high amplitude vibration, as shown in FIG. The surface layer is compacted by the vibration component, and at the same time, a high-amplitude vibration component is transmitted to the deep part of the compaction material 34 through the compacted surface layer, so that the surface layer of the compaction material 34 is compacted in parallel. This allows for powerful compaction deep down.

The compaction density of the compacting material 34 is such that the surface layer of the compacting material 34 is compacted with a low amplitude vibration component, and at the same time, the compacting material 34 can be compacted deep into the compacting material 34 with a high amplitude vibration component. , the fifth for each compaction process.
This is shown by curve C in the figure.

Moreover, when compacting the deep part of the compacting material 34, the high-frequency, low-amplitude vibration acts superimposed on the high-amplitude vibration, so compaction of the deep part of the compacting material 34 is significantly promoted, so the number of compactions can be reduced. This will greatly improve work efficiency.

Note that FIGS. 6 to 8 and 10 each show modified examples of the vibration generator V, and the one in FIG. 6 has the first vibration axis 18 and the second vibration axis 20 independent. In this case, the vibration roller 1 is driven to travel by the tire wheels 7 at the rear of the vehicle body 4.

In the case shown in FIG. 7, the first vibration axis 18 is arranged concentrically with the drum 2, and the second vibration axis 20 is arranged concentrically with the drum 2.
Bearings 17, 1 are arranged parallel to each other by a predetermined distance from
9 to the left and right ribs 8 with support shaft members 12a and 12b.
The first vibration shaft 18 is directly rotationally driven by the vibration motor 22 attached to the pivot member 14 that supports the left support shaft member 12a and pivots the left support shaft member 12a. 18 and the second vibration axis 20
The second vibration generating shaft 20 is configured to be rotationally driven at a higher speed than the first vibration generating shaft 18 via a gear transmission mechanism 36 that interlocks and connects the right end portion of the vibration generating shaft 18 with the right end portion of the vibration generating shaft 18 .

The one in FIG. 8 has the structure shown in FIG. 7 above, in which the eccentric weight 23 of the first vibration generating shaft 18 is formed by a fixed weight 23a and a movable weight 23b smaller than the fixed weight 23a. The vibration force of the shaft 18 can be switched between strong and weak, and as shown in FIG. 9, when the first vibration shaft 18 is rotated clockwise, the fixed weight 23a
and the movable weight 23b are connected to the pin 23 as shown by the imaginary line.
The vibration force increases as the vibration force is eccentrically driven in the same direction via P, and when the first vibration generating shaft 18 is rotated to the left, the movable weight 23b is located on the opposite side to the fixed weight 23a as shown by the solid line. Since it is rotationally driven, the vibration force is relatively small.

10 is the same as that shown in FIG. 7, except that the gear transmission mechanism 36 that interlocks and connects the first vibration generating shaft 18 and the second vibration generating shaft 20 is replaced with a belt transmission device 37.

[Brief explanation of the drawing]

1 to 10 show embodiments of the present invention, FIG. 1 is a side view of the vibrating roller, and FIG. 2 is a side view of the vibrating roller.
Figure 3 is a vibration waveform diagram of the vibrating roller, Figure 4 is a diagram explaining the propagation of vibration from the drum, Figure 5 is a compaction performance curve diagram of the vibrating roller, and Figures 6 to 8 and 10 are partial views corresponding to FIG. 2 of a modified example of the vibration generator, FIG. 9 is a sectional view taken along the line -- in FIG. 8, and FIG. 11 is a compaction performance curve diagram of a conventional vibrating roller. FIG. 12 is a vibration waveform diagram when compacting with a conventional vibrating roller. DESCRIPTION OF SYMBOLS 1... Vibration roller, 2... Drum, 18... First vibration axis, 20... Second vibration axis, 21... Planetary gear device, 22... Vibration motor, 23... First eccentricity Weight, 23a...Fixed weight, 23b...Movable weight, 2
4...Second eccentric weight, 25...Ring gear, 26...
...Planetary gear, 27...Carrier, 31...
Sun gear, 36... Gear transmission mechanism, 37... Belt transmission mechanism.

Claims (1)

[Scope of Claims] 1. In a vibration generator that applies vibration to a drum of a vibrating roller, a first eccentricity for generating high-amplitude vibrations, which is disposed in the drum in parallel with the drum axis and vibrates the drum with high amplitude. a first vibration shaft having a weight; a second vibration shaft having a second eccentric weight for generating low-amplitude vibrations disposed in the drum parallel to the drum axis and vibrating the drum at low amplitude; a first drive means for rotationally driving a first vibration axis; and a second drive means for rotationally driving the second vibration axis at a higher speed than the first vibration axis in parallel with rotationally driving the first vibration axis. 1. A vibration generator for a vibrating roller, comprising: a driving means.