JPS6122288Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to an asphalt finisher that performs road surface paving, and particularly relates to a vibrator tachometer that detects the rotational speed of a vibrator that vibrates a screed for road surface compaction.

BACKGROUND ART Conventionally, an asphalt finisher 1 shown in FIG. 1 is equipped with a screed device 3 that floats up and down independently of a vehicle body 2 that transports necessary composite material. In this screed device 3, two leveling arms 4 are connected to the vehicle body 2 at a towing point T on both sides of the vehicle body 2, and a screed 5 at the rear of the vehicle body 2 is connected to the tip of the arm 4 at a pivot point. They are connected by P. This pivot point P can be changed by manually rotating the thickness control screw 6 to change the attack angle A of the screed 5.
As the vehicle body 2 moves, the screed 5 is towed by the leveling arm 4, and the mixture is rolled onto the road surface to pave it.

Further, a vibrator is attached to the screed 5 to vibrate the screed 5 in order to obtain a good paving condition. That is, in this vibrator, as shown in FIG.
A mounting disk 8 is fixed to the vibrator shaft 7 located inside the vibrator shaft 7, and an eccentric load piece 9 is attached to a part of the outer periphery of the mounting disk 8. When the mounting disk 8 is simultaneously rotated with the rotation of the vibrator shaft 7, the eccentric load piece 9 also rotates, causing the vibrator shaft 7 to vibrate up and down. This vibration of the vibrator shaft 7 causes the screed 5 to vibrate.

The screed 5 adjusts the vibration force by adjusting the rotation speed of the vibrator shaft 7 depending on the type of composite material and the thickness of the pavement, but until now there has been no device that can accurately read this rotation speed. Not in
It was not possible to objectively understand the relationship between pavement conditions and vibrational force.

Purpose The purpose of this invention is to be able to directly read the rotational speed of the vibrator shaft, to objectively understand the relationship between paving conditions and the vibratory force of the screed, and to use a tachometer to read the engine speed. An object of the present invention is to provide a vibrator tachometer for an asphalt finish which can be used as is.

Embodiment Hereinafter, an embodiment embodying this invention will be described with reference to the drawings. Reference numeral 10 is a proximal body fixed to the vibrator shaft 7, and as shown in FIG. It is provided to protrude from the protrusion 10a. Reference numeral 11 denotes a conventionally known proximity switch, which maintains 〓d for a certain period of time when the proximity protrusion 10a of the proximity object 10 comes closest.

12 is a diesel engine of the asphalt finisher 1, 13 is an injection pump thereof, and 14 is a proximity switch attached to the cam position of the pump 13.

Reference numeral 15 is a changeover switch, and as shown in FIGS. 2 and 3, both the proximity switches 11, 1
4 and a tachometer 16 are connected. In this changeover switch 15, the proximity switch 14 is normally connected to the tachometer 16 on the injection pump 13 side, and the proximity switch 11 on the vibrator side is connected to the tachometer only when the operating lever 15a is switched. ing. Then, when this operating lever 15a is released, it returns to its original position due to the spring.
Proximity switch 14 is now connected again. Note that 17 is a battery.

Next, the case where this tachometer 16 is used will be explained. For regular work, the proximity switch 14
The rotation speed of the engine 12 detected from the tachometer 1
Make it read from 6. On the other hand, only when starting work or when paving conditions change, changeover switch 1
5, continue to press the operating lever 15a, and connect the proximity switch 11 on the vibrator side to the tachometer 16.

In this switching state, when the vibrator shaft 7 is rotated, the proximal protrusion 10 of the proximal body 10
a approaches the proximity switch 11 intermittently, this approach is counted and calculated, and the number of rotations is displayed on the tachometer 16. Thereby, the rotational speed of the vibrator shaft 7 is read and the vibration force of the screed 5 is adjusted. Then, when the operating lever 15a is released, it returns to its original state.

Effects The invention described in detail above allows the number of revolutions of the vibrator shaft 7 to be directly read by the tachometer 16, so there is no need to rely on the intuition of the operator as in the past. It is possible to objectively grasp the relationship between the vibration force of , which has the effect of being able to be manufactured at low cost.

[Brief explanation of the drawing]

Figure 1 is a schematic side view showing the entire asphalt finisher, Figure 2 is a schematic diagram showing the vibrator tachometer according to this invention, and Figure 3 is a diagram showing the wiring relationship between the changeover switch, both proximity switches, and the tachometer. It is. Asphalt finish...1, Screed...5, Vibrator shaft...7, Mounting disc...8, Eccentric load piece...9, Proximity body...10, Proximity switch...11, Engine...12, Proximity Switch...14, Changeover switch...15, Tachometer...16.

Claims (1)

[Scope of Claim for Utility Model Registration] A proximity switch that detects engine rotation, an engine tachometer that displays the engine rotation speed based on a detection signal from the proximity switch, and a proximity object fixed to a vibrator shaft of a screed. A detection signal from the proximity switch that detects the rotation of the engine and a detection signal of the proximity switch that detects the nearby object are appropriately transmitted between the proximity switch that detects the rotation of the engine and the engine tachometer. A vibrator tachometer for an asphalt finish comprising a changeover switch that outputs output to the tachometer.