JPS62164904A - Apparatus for generating vibration of vibration roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, while compacting the compaction materials such as roadbed, roadbed, asphalt, etc.

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 will be broken and compaction will occur.On the other hand, if vibration is performed at low amplitudes, the vibrations will not penetrate 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 because of this.

Therefore, in the past, it was necessary to use low-amplitude and high-amplitude vibrations differently in order to obtain a uniform degree of compaction from the surface layer to the deep layer. After that, the vibration generator in 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 high amplitude to compact the deep part of the compacted material, and then the drum is vibrated at low amplitude to compact the surface layer. As shown in FIG. 12, the compaction work requires 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. the second of
a second vibration generating shaft having an 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 that rotates at a speed different from the first vibration axis 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 by the second driving means at a speed different from that of the first vibration generating shaft, 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 compacts the surface layer or surface part of the compacted material, and the high-amplitude vibration component compacts the deep part of the compacted material. is compacted.

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.

(Effects of the Invention) According to the vibration generating device for a vibrating roller of the present invention, as explained above, the high amplitude vibration caused by the first eccentric weight and the high amplitude vibration caused by the second eccentric weight have a frequency that is higher than that of the drum. Since a compound vibration is added that is a combination of different low amplitude vibrations,
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.

In addition, the high-amplitude vibration component is transmitted to the deep part of the compacted material through the surface layer compacted by the low-amplitude vibration component, so there is little chance of breaking crushed stone near the surface layer, and the compaction is uniform from the surface layer to the deep layer. High compaction quality can be obtained.

These can greatly improve work efficiency and compaction quality.

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

As shown in FIG. 1, the vibrating roller l has a cylindrical steel drum 2 as a front wheel and a second vibrating roller l mounted on a front frame 4 at the front of the vehicle body.
The vehicle body 4 is pivotally supported via a support bracket 5a15b shown in the figure, and 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. A support shaft member 12b that supports the right end of the vibration generator (2), which will be described later, is fixed concentrically to the drum 2 on the outer surface of the central part of the right rib 8b. A rubber support plate IO is installed on the outer surface side via the anti-vibration rubber 9.
is fixed, and an output portion 11a of a traveling motor 11 (hydraulic motor or electric motor) fixed to the support bracket 5 is fixed to the rubber support plate 10. By driving the motor 11 forward or reverse, the drum 2 is rotated and the vibrating roller 1 is moved forward or backward.

A support shaft member 12a is fixed concentrically with the drum 2 on the outer surface side of the left rib 8a, and a sleeve shaft 12 is concentrically bolted to the left side of this support shaft member 12a via a ring gear 25. A pivot member 1 supporting the sleeve shaft 12 via two sets of ball bearings 13 on the sleeve shaft 12
4 is externally mounted, and this pivot member 14 is attached to the support bracket 5b.
It is welded to a rubber support plate 16 which is fixed to the rubber support plate 16 via a vibration isolating rubber 9.

Next, a vibration generator V is installed in the center of the drum 2 concentrically with the drum 2 to apply vibration to the drum 2.
I will explain about it.

The vibration generator ■ has left and right ribs 8a and 8b with both ends connected to left and right support shaft members 12a and 1 through a pair of bearings 17.
2b, a cylindrical first vibration shaft 18, a second vibration shaft 20 whose both ends are supported inside the first vibration shaft 18 via a pair of bearings 19, and each vibration shaft. Vibration motor 22 that rotates 18 and 20 via a planetary gear mechanism 21
(hydraulic motor or electric motor).
The first eccentric weights 23 provided at both ends of the first vibration shaft 18 are formed to have a larger eccentric moment than the second eccentric weight 24 provided at the center of the second vibration shaft 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 meshing with the inside of a ring gear 25 is used to transmit vibration to the vibration motor 2.
It is connected to the output shaft 28 of No. 2 via a coupling 29,
Further, the carrier 27 is connected to the left end of the first vibration shaft 18, the sun gear 31 is connected to the left end of the second vibration shaft 20, and the second vibration shaft 20 is connected to the left end of the first vibration shaft 18. It is designed to be driven to rotate at a higher speed.

In the above-mentioned vibration generator (2), 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 (2), 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. As amplitude vibration acts,
Since low-frequency, high-amplitude vibrations act on the drum 2 due to the rotation of the first vibration generating shaft 18 having the eccentric weight 23 having a large mass,
As shown in FIG. 3, the vibration of the drum 2 is a complex vibration in which a high frequency, low amplitude vibration and a low frequency, high amplitude vibration are combined.

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, the 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. , as shown by curve C in FIG. 5 for each compaction process.

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 the 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 (2), and the one in FIG. 6 has the first vibration axis 18 and the second vibration axis 20 independently. 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 one shown in FIG. 7, the first vibration axis 18 is arranged concentrically with the drum 2, and the second vibration axis 20 is eccentrically arranged by a predetermined distance from the first vibration axis 18 and arranged in parallel. The respective bearings 17 and 19 provided at both ends of the support shaft members 12a and 12b
The first vibration generating shaft 18 is directly rotationally driven by a vibration motor 22 which is supported by the left and right ribs 8a and 8b and is attached to a pivot member 14 that pivotally supports the left support shaft member 12a. The second vibration shaft 20 is rotationally driven at a higher speed than the first vibration shaft 18 via a gear transmission mechanism 36 that interlocks and connects the right end portion of the first vibration shaft 18 and the right end portion of the second vibration shaft 20. It is configured so that

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 when the first vibration shaft 18 is rotated clockwise as shown in FIG. 23P, the vibration force increases, 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.

The one in Figure 1O is the first one in the one shown in Figure 7 above.
The gear transmission mechanism 36 that interlocks and connects the vibration generating shaft 18 and the second vibration generating shaft 20 is replaced with a belt transmission device 37.

[Brief explanation of drawings]

1 to 10 show embodiments of the present invention.
The figure is a side view of the vibrating roller, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, 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, Figures 6 to 8, and Figure 10 are partial views corresponding to Figure 2 of modified examples of the vibration generator, and Figure 9 is the ■-■ line in Figure 8. A sectional view, FIG. 11 is a compaction performance curve diagram of a conventional vibrating roller, and FIG. 12 is a vibration waveform diagram when compacting with a conventional vibrating roller. ■...Vibration roller, 2...Drum, 18...First vibration axis, 20...Second vibration axis, 21...Planetary gear device,
22... Vibration motor, 23... First eccentric weight, 23
a: Fixed weight, 23b: Movable weight, 24: Second eccentric weight, 25: Ring gear, 26: Planetary gear,
27...Carrier, 31...Sun gear, 36...Gear transmission mechanism, 37...Belt transmission mechanism.

Claims (1)

[Claims] (1) A vibration generator for applying vibration to a drum of a vibrating roller, wherein a first eccentric weight is disposed in the drum in parallel with the drum axis and has a first eccentric weight for generating high-amplitude vibrations that vibrates the drum with high amplitude. a second vibration axis having a second eccentric weight disposed in the drum in parallel with the drum axis and for generating low-amplitude vibrations that vibrates the drum at low amplitude; and the first vibration-excitation axis. A first driving means for rotationally driving the shaft, and a second driving means for rotationally driving the second vibration generating shaft at a speed different from that of the first vibration generating shaft in parallel with rotationally driving the first vibration generating shaft. A vibration generator for a vibrating roller, characterized by: