CZ299778B6 - Tandem-type vibratory roller - Google Patents

Abstract

The present invention relates to a tandem-type vibratory roller consisting of a front runner (11) and a rear runner (12), a regulating vibration exciter (13, 14) and at least two acceleration sensors (16, 17), which are connected through the mediation of individual inputs for controlling vibration mode with a control unit (15), wherein the inputs are the following: an input (20) for selection of a vibrating runner, an input (19) for vibration switching off and an input (18) for spinning the vibration exciter balancers. The front runner (11) is provided with an independent regulating vibration exciter (13) and the rear runner (12) is provided with an independent regulating vibration exciter (14), too.

Description

Tandem vibratory roller

Technical field

The invention relates to an arrangement of a tandem vibratory roller equipped with a continuously variable vibration exciter.

BACKGROUND OF THE INVENTION

Currently manufactured tandem vibratory rollers of higher weight categories of seven to twelve tons are usually equipped with two-stage, exceptionally multi-stage regulation of vibration parameters. This control is controlled manually by the machine operator. A significant disadvantage of the mentioned i? In the known solutions, it is not possible to adapt the vibration parameters, i.e. the amplitude and frequency, so that the manually set value is always optimal for a wide range of different types of compacted materials including different thicknesses of the layers to be compacted.

Another known solution for optimizing vibration parameter settings is the construction of tandem 20 vibratory rollers, which are equipped with a device for automatically evaluating the compaction degree, including a device that allows the automatic adjustment of the necessary parameters.

This above-described and practically desirable trend of optimizing vibration parameter settings for tandem vibratory rollers allows several known solutions. In order to present the state of the art in this field, two known systems are further described. One system is known under the trade name VARIOCONTROL and the other is marketed under the name ACE.

The VARIOCONTROL system includes a vibration exciter with a controlled excitation force vector. The disadvantage of the VARIOCONTROL system is the high weight of the vibrator used and its structural complexity, which limits the use of this system to only one of the tandem roller treads.

The ACE system uses the principle of regulating the eccentric torque of a circular vibrator by means of a differential gearbox, which changes the position of the two coaxial eccentrics. The disadvantage of this solution is the costly transmission and the use of a control vibrator on only one of the tandem roller treads.

In view of the above, tandem vibratory rollers are only used on one of the treads, while the other tread is equipped with a two-amplitude vibrator. This compromise solution, however, does not allow for maximum utilization of the tande4 () compaction power of the vibratory roller.

SUMMARY OF THE INVENTION

These shortcomings will be remedied by a new tandem vibratory roller solution consisting of a front and a rear drum, two separate vibration exciters and at least two acceleration sensors that are connected via individual inputs to the control unit, which has additional inputs, the input for vibrating tread selection, vibrating tread mode selection input, vibration exciter shutdown input, and mute excitation input. The essence of the new solution is that both the front and rear treads contain a separate vibration actuator. Furthermore, the front tread and also the rear tread are equipped with separate acceleration sensors, wherein the control unit adjusts the vibration parameters according to the data of the acceleration sensor, which is always second in the direction of travel of the tandem roller. And in addition, said control unit turns on and off the function of the vibration control drivers in the front or rear tread by means of an input for spinning unbalance vibration exciters and an input

For stopping the vibration without stopping the rotation of said unbalances by resetting the eccentric torque of both vibration control drivers.

? BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates one embodiment of a tandem vibratory roller equipped with a continuously variable vibration exciter.

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DETAILED DESCRIPTION OF THE INVENTION

The tandem vibratory roller 10 comprises a front tread 11 and a rear tread 12. wherein each individual tread is equipped with a separate continuous-vibration regulating drive 13, 14 for rotating the vibration. Both said vibration control drivers 13 and 14 are controlled by a single control unit 15.

Further, the front tread M of the tandem vibratory roller 10 is equipped with an acceleration sensor 60, the rear tread 12 comprising an acceleration sensor 70. Said control unit 15 adjusts the vibration parameters according to one of the cited acceleration sensors 16, which at that time is always second in the direction of travel of the tandem vibratory roller 10.

By automatically selecting one of the acceleration sensors 16.17, damage to the compacted layer by the second tread that follows the first tread in the already compacted track formed by the first tread is avoided.

2? tread.

By means of three individual inputs 18, 19, 20 of the control unit 15, which are the input 20 for selecting the vibrating tread, the input 19 for switching off the vibration exciter and the input 18 for spinning the unbalance of the vibration exciters. to the B5, the necessary vibration function. Using the vibration tread selection input 18, the operator can determine which of the vibration control drivers 13 or 14 will vibrate, whether the front tread 11 or the rear tread 12, or both.

The operator of the tandem vibratory roller 10 prior to commencing the technological compaction operation for 55 via the spin input 18 rotates both vibration exciters L3 and 14, which at this point are set to zero eccentric torque, and the actual vibration triggering is influenced by the operator to the control unit 15.

An advantage of the described arrangement of the tandem vibratory roller 10c. This means that it is possible to switch off the vibrators 40 or to reset the eccentric torque without having to stop the rotation of the unbalance of the vibration regulators 13 and 14. This solution reduces fuel consumption, since energy-intensive braking and subsequent spinning of the unbalanced vibration control actuators B14 when reversing the tandem vibratory roller 10 is eliminated.

Industrial utilization

The new tandem vibratory roller solution can be advantageously used for compacting hot asphalt mixtures, especially thin layers, where optimizing the front and rear tread vibration parameters allows increasing the surface performance of the tandem roller and stopping vibration by zeroing the vibrator's eccentric torque without adjusting its rotation.

Claims (3)

Tandem vibratory roller (10) comprising a front tread (11) and a rear tread (12), vibration control drivers (13, 14), and at least two acceleration sensors (16, 17) which are connected via individual inputs to a control unit (15) further comprising an input (20) for selecting a vibrating tread. an inlet (19) for switching off the vibration and an inlet (18) for actuating the unbalance weights and also the vibration control drivers (13, 14). characterized in that the front tread (11) is provided with a separate vibration control actuator (13), the rear tread (12) is provided with a separate vibration control actuator (14). Tandem vibratory roller (10) according to claim 1, characterized in that the front tandem vibrating roller (10). the tread (11) is equipped with an acceleration sensor (16) and the rear tread (12) comprises an acceleration sensor (17), the control unit (15) adjusting the vibration parameters according to the data of the acceleration sensor which is always second in the tandem vibration direction cylinder (10). Tandem vibratory roller (10) according to claims 1 and 2, characterized in that the control unit 20 (15) switches the vibration control function on and off in the front (11) or rear tread (12) via the rotary inlet (18). the vibration exciter unbalance and the vibration shutdown input (19) without stopping the rotation of said unbalances by resetting the eccentric torque of the vibration excitation control (13, 14).