JPH0231167B2 - SHIKINARASHIKIKAINIOKERUHOSOATSUSOKUTEISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a pavement thickness measuring device installed in a leveling machine such as an asphalt finisher or base paver.

``Prior Art'' As is well known, in an asphalt finisher, the asphalt mixture (hereinafter referred to as composite material) in the hopper is fed to the rear spredding screw by a bar feeder while the vehicle is running. A screed is used to spread it evenly from side to side, and a screed suspended from the rear end of the leveling arm spreads it out evenly.

By the way, when paving roads with a leveling machine such as the above-mentioned asphalt finisher, if the pavement thickness becomes thinner than the design value, the strength of the pavement becomes weaker, and conversely, if it becomes thicker than the design value, the strength of the pavement becomes weaker. There is no problem in terms of strength, but there is a problem in that the amount of composite material consumed increases and economic losses are incurred. Therefore, when paving roads, it is necessary to proceed with the work while checking from time to time whether the pavement thickness is as designed.

``Problems to be Solved by the Invention'' However, conventionally, the above-mentioned pavement thickness was determined by a worker different from the one operating the leveling machine using a gauge rod whose insertion distance was adjusted to the target pavement thickness. It was checked by inserting it into the constructed pavement. For this reason, at least two workers are required for one leveling machine, which has been a major obstacle to promoting labor savings. In addition, there were problems in that not only the hard-constructed pavement was damaged, but also that the thickness of the pavement could not be checked continuously, and it was difficult to perform this checking process itself.

The present invention was made in view of the above circumstances, and
An object of the present invention is to provide a pavement thickness measuring device for a leveling machine that can continuously and automatically measure pavement thickness, thereby speeding up paving work and saving manpower.

"Means for Solving the Problems" In order to achieve the above object, the pavement thickness measuring device of the present invention includes a detector that detects the height of the swing center point of the leveling arm, and a detector that detects the height of the screed. a detection means consisting of a detector; a storage means storing measured data of the height of the center of swing of the leveling arm, the height of the screed, and the pavement thickness determined by them; Compare both height values with the measured data stored in the storage means, select from the measured data a value that is equal to or closest to the detected both height values, and calculate the corresponding actually measured pavement thickness. The pavement thickness retrieval unit includes a calculation unit for selecting the pavement thickness.

"Function" And in the pavement thickness measuring device of the present invention,
Pavement thickness is measured by continuously detecting the height of the center point of swing of the leveling arm, etc. using a detection means, and searching the pavement thickness corresponding to the detected value from the measured data in the pavement thickness search section. This is how it was done.

"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIGS. 2 and 3 show the entire asphalt finisher, in which a pair of left and right link members 2, 2 are attached to both sides of a traveling vehicle body 1, one of which is rotatably supported. A pair of left and right leveling arms 4, 4 having a screed 3 suspended from their rear ends are attached to the other ends of these link members 2, 2, with their front ends rotatably supported by pivots 5, 5. These leveling arms 4, 4
has a structure that allows it to swing vertically within a vertical plane along the longitudinal direction of the traveling vehicle body 1. Further, the ends of rods of a pair of left and right leveling cylinders 6, 6, which are hydraulic cylinders whose base ends are rotatably connected to the frame 1a of the traveling vehicle body 1, are rotatably connected to the link members 2, 2. By expanding and contracting these leveling cylinders 6, 6 and rotating the link members 2, 2, the pivot points 5, 5, which are the pivot points of the leveling arms 4, 4, can be rotated. It can be moved up and down from the reference position. The asphalt finisher is equipped with a pavement thickness measuring device for automatically measuring the pavement thickness t.

As shown in Fig. 1, the above-mentioned pavement thickness measuring device has the following features:
Pivot height detector 7 and screed height detector 8
a detection means 9 consisting of; a pavement thickness search unit 10 that searches for pavement thickness t from actual measurement data described later based on the signal from this detection unit 9; Display section 11 that displays t
It is composed of.

The pivot height detector 7 detects the height H of the pivot shaft 5 of the leveling arm 4 from the road surface (hereinafter referred to as the pivot height).
As shown in the figure, a cylindrical linear detector 14 is vertically attached to the handrail 12 on the step 1b of the vehicle body 1 via the mounting plate 13 with the movable needle facing downward, and this linear detector The movable needle tip of the device 14 is connected to a mounting seat 17 at the front end of the leveling arm 4 via a connecting bar 15 and a connecting fitting 16. When the pivot shaft 5 of the leveling arm 4 moves up and down, the vertical displacement is transmitted to the linear detector 14 via the connecting bar 15 and the connecting fitting 16, and an electrical signal related to the pivot height H can be obtained. There is. The screed height detector 8 detects the screed height h by detecting the stroke of the screed cylinder 25 for lifting the screed, and is provided parallel to the screed cylinder 25.

On the other hand, the pavement thickness retrieval section 10 is composed of a microcomputer, and is connected to the detection means 9 by I/O.
A/ communicated via O interface 18
It is composed of a D converter 19 and a CPU (central processing unit) 21 that is connected to the A/D converter 19 and to the display unit 11 via an I/O interface 20. The storage means 21a stores actual measurement data of the pavement thickness t. This actual measurement data shows that when the asphalt finisher is operated on a horizontal and flat road surface, the pivot height H and the screed height h are changed as H ₁ ,..., Hm and h ₁ ,...hn, respectively. t ₁ , ₁ = f(H _{1 ,} h ₁ ) t _{1 , 2 =} f(H ₁ , h ₂ ) ………………………………… t ₁ , n = f (H ₁ , hn) t ₂ , ₁ = f (H ₂ , h ₁ ) t ₂ , ₂ = f (H ₂ , h ₂ ) ………………………………… tm, ₁ = f (Hm, h ₁ ) ………………………………… tm, n = f (Hm, hn) It is stored as a function like this. and,
When the pivot height Hi and the screed height hj detected by the detection means 9 are input to the CPU 21, the arithmetic unit 21b determines the pivot height that is equal to or closest to the pivot height Hi and the screed height hj.
Hm and screed height hn are selected from the measured data, and the corresponding measured pavement thicknesses tm and n are searched.

Further, the display section 11 is composed of an LCD,
Pavement thickness obtained in the pavement thickness search section 10
This is a digital display of tm and n. moreover,
In the figure, 22 is a hopper, 23 is a bar feeder, and 24 is a spreading screw.

However, when asphalt paving of a road is performed using an asphalt finisher, as in the conventional case,
While the traveling vehicle body 1 is running at a constant speed, the mixed material put into a hopper 22 is sent to a spreading screw 24 by a bar feeder 23, and is supplied to the front part of a screed 3. Then, the screed 3 is pushed upward by the resistance of this composite material, and the composite material is compressed by the weight of the screed 3 itself, but when the resistance and the weight of the screed 3 are balanced, the leveling arm 4 , 4 is determined, and the attack angle α of the screed 3 is determined.
is determined, and the composite material is laid on the road with the required pavement thickness t.

Here, the worker must proceed with the work while checking whether or not this pavement thickness t has reached the set value, but this pavement thickness t is automatically and continuously determined by the pavement thickness measuring device configured as described above. detected. That is, the pivot height Hi is detected by the pivot height detector 7, and the screed height hj is detected by the screed height detector 8, and these detected values Hi and hj are sent to the I/O interface 18 and the A/O interface. Through the D converter 19, the CPU 2
Sent to 1. Then, in CRU21, the pivot height Hm and the screed height hm which are equal to or closest to the above detected values Hi, hj are selected from the actual measurement data.
is searched, the pavement thickness tm,n corresponding to these is selected, and the pavement thickness tm,n is displayed on the display section 11.
displayed digitally. Therefore, the worker can proceed with the paving work while checking the displayed values of the pavement thickness tm and n, which eliminates the conventional inefficient method of measuring the pavement thickness by sticking a gauge rod into the constructed pavement. This frees you from heavy work, speeding up paving work and saving labor.

In addition, the pivot height H and screed height h
Alternatively, it is also possible to measure other variables as necessary and use the measured values to find the pavement thickness t using a mathematical formula, but the actual pavement thickness t depends on the pivot height H and screed height h. In addition to being highly dependent, it also varies depending on other conditions such as the condition of the road surface and the properties of the asphalt mixture. Therefore, it is not easy to take all of these factors into account and obtain highly accurate measurement values. However, in the pavement thickness measuring device described above, since the pavement thickness t is determined using actual measurement data that has been accumulated in advance, the measured value is extremely close to the actual value and has high reliability. Furthermore, since only two variables, the pivot height H and the screed height h, are detected by the detection means 9, the configuration is simple and implementation is easy.

By the way, in the above, when it is necessary to change the pavement thickness t, the operator operates the leveling cylinders 6, 6 to move the leveling arms 4, 4 up and down, but this is automatically done by feedback control. It is also possible to make it happen.

Further, in the above embodiment, the pivot height H and the screed height h are detected by the detection means 9, but instead of the screed height h, the inclination angle of the leveling arm 4 in the front-rear direction from the reference state is detected. It may be detected and used. FIG. 6 shows an embodiment in this case, in which an inclination sensor 26 is disposed approximately at the center of the leveling arm 4, and the inclination angle is detected by this inclination sensor 26. .

"Effects of the Invention" As explained above, the pavement thickness measuring device of the present invention detects the height of the swing center point of the leveling arm, and measures and stores the pavement thickness corresponding to the detected value in advance. Since it is designed to search from the data that has been collected, pavement thickness can be measured continuously with extremely high accuracy, making paving work easier and faster, saving manpower and labor. be able to.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention, with Figure 1 being a block diagram, Figure 2 being a plan view of an asphalt finisher, and Figure 3 being a side view of the same.
FIG. 4 is a side view of the arm height detector, FIG. 5 is a view taken along the - arrow in FIG. 4, and FIG. 6 is a side view for explaining another embodiment. 3...Screed, 4...Leveling arm, 9...
Detection means, 10...Pavement thickness search unit, 21...CPU,
21a...Storage means, 21b...Arithmetic unit.

Claims (1)

[Claims] 1. A leveling arm is attached to a traveling vehicle so as to be swingable within a vertical plane along the longitudinal direction of the traveling vehicle,
In a leveling machine in which the leveling arm is equipped with a screed for leveling the asphalt mixture on the road surface, a detector for detecting the height of the swinging center point of the leveling arm and a detector for detecting the height of the screed are provided. a detection means consisting of a detector; a storage means storing actual measurement data of the height of the singing center point of the leveling arm, the height of the screed, and the pavement thickness determined by them; Compare both height values with the measured data stored in the storage means, select from the measured data a value that is equal to or closest to the detected both height values, and calculate the corresponding actually measured pavement thickness. A pavement thickness measuring device for a leveling machine, comprising: a pavement thickness retrieval unit equipped with a calculating unit for selection;