JPH0749644B2 - Flatness display device for leveling machine - Google Patents

Description

Detailed Description of the Invention

[Industrial applications]

The present invention relates to a flatness display device applied to a leveling machine such as an asphalt finisher or a base paver.

[Prior art]

When paving a road, it is important to pave while maintaining the desired flatness so that there are as few unevenness as possible on the pavement surface. Conventionally, in order to ensure such flatness, pavement should be done. The structure is based on curbs or other structures lined up on the side edges of the roads and landscaping, or if there is no such structure, the operator looks at the finished surface directly to see the machine. Was driving.

[Problems to be Solved by the Invention]

However, in the case of the former, it is relatively easy to carry out pavement that maintains the flatness of the structure, but it is not always convenient to have a reference structure. Since it is necessary to dispose the structure, the work efficiency is reduced, and the place away from the standard must rely on the intuition of the operator. Further, in the latter case, since it is exactly up to the operator's intuition, a visual illusion or the like cannot be eliminated, and the accuracy cannot be denied. The present invention has been made in view of the above circumstances, and it is possible to easily and accurately grasp the flatness of a pavement surface, and based on this, it is possible to finish the pavement surface with better flatness. An object is to provide a flatness display device in a leveling machine.

[Means for Solving the Problems]

The present invention is made to achieve the above object, a traveling vehicle, a hopper for putting an asphalt mixture,
A feeder for transferring the asphalt mixture in the hopper,
A screw that spreads the asphalt mixture sent from the feeder to the left and right, a screed that spreads the asphalt mixture spread by the screw, and a pavement surface of the asphalt mixture spread by the screed Height measurement at every distance, a flatness display device in a laying machine equipped with a measuring device for calculating the unevenness difference between the plurality of measuring points, wherein the unevenness difference at a plurality of measuring points by the measuring device. Is characterized in that the accumulated values representing the flatness of the measurement points and thus sequentially accumulated are graphically displayed at the measurement points and thus simultaneously.

[Action]

According to the present invention, the unevenness of the pavement surface of the asphalt mixture laid evenly by the screed is displayed as a graph of the measurement points and therefore simultaneously, so that the operator can check the pavement condition from the graph displayed on the display device. It is possible to easily and accurately grasp the tendency of flatness and the like, and based on this, the paving surface having good flatness can be finished by appropriately operating the laying machine.

【Example】

An embodiment in which the present invention is applied to an asphalt finisher will be described below with reference to the drawings. Reference numeral 1 in FIG. 1 denotes a traveling vehicle of an asphalt finisher AF whose basic structure is well known. At the front of the traveling vehicle 1 is provided a hopper 2 for putting in an asphalt mixture. The asphalt mixture in the hopper 2 is transferred to the rear of the vehicle body (rightward in FIG. 1) by a feeder (not shown) at the lower part of the vehicle body, and then spread uniformly to the left and right by a screw (not shown) to form a left-right pair. The screed 3 is used to spread the material. The screed 3 is supported by a support shaft 5 provided on a substantially central side surface of the traveling vehicle 1 via a leveling arm 4. The support shaft 5 is vertically moved by a pivot cylinder 6. Measuring devices A and A (only the measuring device on the left side is shown in FIG. 1) are provided on the left and right of the rear portion of the screed frame 3a that supports the screed 3. The measuring device A on the left side is fixed to the screed frame 3a via a bracket, and the measuring device A on the right side is fixed to the screed frame 3a.
It is horizontally rotatably attached via a hinge and is fixed via a bracket. Since the two measuring devices A and A are manufactured symmetrically, their measuring functions are exactly the same, and the measuring device A on the left side will be described in detail below. The measuring device A mainly includes a reference member 8, a pair of first and second height detectors 9 and 10, and an inclination detector 11. As shown in FIG. 3, the reference member 8 is made of an angle member, and is fixed to the bracket 7 with bolts 13 with its length direction aligned with the traveling direction of the traveling vehicle. Further, as shown in FIG. 4, fixed frames 14 having a U-shaped cross section are fixed to the reference member 8 at both ends thereof by means of welding or the like. It is provided. Then, inside each of the fixed frames 14, a mounting plate 15 is mounted by a bolt 17 and a nut 18 via a vibration damping material 16 such as rubber. Further, as shown in FIG. 5, in the central portion of the reference member 8,
The fixing plate 20 is provided with its side edge and upper edge fixed to the reference member 8 by welding or the like. A mounting plate 22 having a support 21 is attached to the fixed plate 20 with a bolt 24 and a nut 25 via a vibration damping material 23 such as rubber. Each of the mounting plates 15 has a first height detector 9 and a second height detector 9,
10 is attached with bolts 26. Screed frame 3a
A first height detector 9 provided close to the vehicle and a second height detector 10 provided rearward from the screed frame 3a are provided on a road surface facing the reference member 8 vertically.
Measure the distances H ₁ and H ₂ to P ₁ and P ₂ (see Fig. 6), respectively. There are various types such as a laser type and an ultrasonic type as the types of the first and second height detectors 9 and 10, but the types and structures are arbitrary. As shown in FIG. 4, a backing plate 27 is attached to the fixed frame 14 with a screw 28 by closing the through hole 14a of the fixed frame 14. The height detectors 9 and 10 output their measurement signals to the arithmetic unit 30. Further, as shown in FIG. 5, the inclination detector 11 is attached to the support base 21 with bolts 29a and nuts 29b. The inclination detector 11 measures the inclination of the reference member 8 in the vertical plane in the longitudinal direction. The inclination detector 11 also outputs the measurement signal to the arithmetic unit 30. Further, reference numeral 19 in FIG. 1 denotes a mileage detector for mileage calculation provided at the lower end of the front part of the traveling vehicle 1. The mileage detector 19 also outputs its measurement signal to the arithmetic unit 30. Now, the arithmetic unit 30 receives a signal output from the mileage detector 19 every time the reference member 8 moves the distance m between the two mileage detectors 9 and 10 together with the traveling vehicle, and performs a required calculation. Do. The arithmetic unit 30 receives an analog output of each of the height detectors 9 and 10 and an inclination detector 11 and converts the analog output into a digital output, and an A / D converter 31 and the A / D converter. I / O (input-output) interface 32 to which the digital outputs of device 31 and mileage detector 19 are input, and this I / O interface 32
The arithmetic unit 33 that performs an arithmetic operation based on the data from the / O interface 32, the data storage unit 34 that inputs and stores the numerical value obtained by the arithmetic unit 33, and outputs it to the arithmetic unit, and the arithmetic unit 33. It is composed of an I / O interface 36 for processing data for sending the calculated numerical value to the display device 35 according to the present invention provided in the driver's seat of the traveling vehicle 1. The arithmetic unit 33 of the arithmetic unit 30 receives the signal output from the traveling distance detector 19 every time the traveling vehicle 1 travels the distance m between the height detectors 9 and 10, and as shown in FIG. From the measurement distances H ₁ and H _{2 of the} height detectors 9 and 10 at that time and the measurement angle θ of the tilt detector 11, the unevenness difference δ between the two points P ₁ and P ₂ is obtained.
Is calculated by the following formula (1) to determine. δ = H _1cos θ + m _sin θ−H _2cos θ (1) From this point onward, the unevenness difference is calculated and calculated for two consecutive measurement points along with the traveling of the traveling vehicle, that is, for each adjacent measurement point. To go. The unevenness difference δ obtained as described above is stored in the data storage unit 34
Sent to. Further, the calculation unit 33 of the calculation device 30 calculates the accumulated value δ _T of the unevenness difference δ obtained as described above by the following equation (2). δ _T = Σδ (2) Then, on the display device 35, this value δ _T is graphically displayed at each measurement point in the range of a certain mileage, and accordingly at the same time, the flatness of the pavement condition. Is displayed. FIG. 7 shows a display screen of the display device 35 by means of liquid crystal or plasma. That is, in the screen of FIG. 7, the horizontal axis is the distance (unit: m), the vertical axis is the accumulated value of the unevenness difference δ _T (unit: mm), the point (a).
Is the current measurement point, and point (b) is the oldest measurement point on the screen. In this case, the distance m is 250 (mm),
This δ _T for each interval m is continuously plotted and graphed over the range of 20 (m). On this screen, the current measurement point (a) and the oldest measurement point (b) on the screen move sequentially from left to right with a predetermined interval according to the predetermined progress of pavement (the new measurement point is Displayed to the right of (a), the oldest measurement point (b)
Disappears), when it reaches the right edge of the screen, it returns to the left edge and continues the display. Also, on this screen, the allowable value of δ _T is set to plus or minus 6, and when it exceeds this allowable value, it returns to 0. Note that FIG. 8 is a table showing an example of the unevenness δ of the pavement surface and the accumulated value δ _T for each measurement point with respect to the traveled distance, but this value is not related to the plotted value of FIG. 7. Now, according to the asphalt finisher AF equipped with the display device 35, as in the conventional case, the asphalt mixture in the hopper 2 is sent to the screw by the feeder and is spread evenly in front of the screed 3 by this screw, It is paved while being laid evenly by the screed 3. At that time, the first and second height detectors 9 and 10, the inclination detector
11, the traveling distance detector 19 and the arithmetic unit 30 operate as described above, the unevenness difference δ of the pavement surface is measured at intervals m, and the accumulated value δ _T is displayed on the display device 35. Therefore, the operator can immediately recognize the leveling state of the asphalt mixture by the screed 3, that is, the flatness of the pavement surface by looking at the display screen of the display device 35, and based on this, the asphalt mixture can be recognized. The screed 3 may be operated so as to spread it evenly. As a result, a paved surface having good flatness can be finished.

【The invention's effect】

As described above, according to the flatness display device in the leveling machine of the present invention, the hopper that puts the asphalt mixture into the traveling vehicle, the feeder that transfers the asphalt mixture in the hopper, and the feeder. The screw that spreads the asphalt mixture sent to the left and right, the screed that spreads the asphalt mixture spread by the screw, and the pavement surface of the asphalt mixture spread by the screed at a predetermined distance in the traveling direction. Height measurement, a flatness display device in a laying machine equipped with a measuring device for calculating the unevenness difference between the plurality of measuring points, the unevenness difference at a plurality of measuring points by the measuring device, It is characterized in that the accumulated values representing the flatness of the measuring points and thus the sequentially accumulated values are graphically displayed at the measuring points and thus simultaneously. Therefore, the operator can easily and accurately grasp the tendency of flatness in the pavement state from the graph displayed on the display device, and based on this, the flattening machine can be appropriately operated to obtain good flatness. It has the effect of being able to finish the pavement surface that it has.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a leveling machine for carrying out the present invention, FIG. 2 is a block diagram showing an example of a control device, FIG. 3 is an enlarged view of a III circle portion in FIG. 1, and FIG. The figure shows the mounting state of the height detector, FIG. 5 shows the mounting state of the tilt detector, FIG. 6 is an explanatory view of the unevenness difference measurement, and FIG. 7 is an example of the display screen of the display device. The front view shown in FIG. 8 is a table of an example of measurement equipment values. 1 ... traveling vehicle, 2 ... hopper, 3 ... screed, 9
...... First height detector, 10 ...... Second height detector, 35 ...
… Display device, A …… Measuring device, AF …… Asphalt finisher.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Saito 27 Shinisogo-cho, Isogo-ku, Yokohama-shi, Kanagawa Inside the Niigata Iron Works Development Center Co., Ltd. Address Niigata Construction Machinery Co., Ltd. (56) References: Actual Development Sho 63-272803 (JP, U) Actual Public Sho 62-33763 (JP, Y2)

Claims (1)

[Claims] 1. A hopper for putting an asphalt mixture into a traveling vehicle, a feeder for transferring the asphalt mixture in the hopper, a screw for spreading the asphalt mixture sent from the feeder to the left and right, and a screw for The screed that spreads the spread asphalt mixture and the pavement surface of the asphalt mixture that is spread by the screed measure the height at predetermined distances in the traveling direction, and calculate the unevenness difference between these multiple measurement points. A flatness display device in a leveling machine provided with a measuring device, the unevenness difference at a plurality of measurement points by the measuring device, the accumulated value representing the flatness of the measurement points and therefore sequentially accumulated,
A flatness display device in a laying machine, which is characterized by displaying the measurement points and, therefore, a graph simultaneously.