JP2504898Y2 - Operating device for leveling machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a leveling machine such as an asphalt finisher or a base paver.

[0002]

The left and right side surfaces of the Related Art traveling vehicle, a pair of Reberi <br/> Nguamu is its its distal end to the support shaft of the pivot cylinder
In a leveling machine in which the screeds are pivotally supported and attached vertically, respectively, and the screeds are attached to the rear ends of the pair of leveling arms, when changing the pavement thickness of the asphalt mixture by the screeds, The pivot cylinder moves the support shaft to move the leveling arm upward or downward, thereby changing the inclination angle of the screed.

In such a leveling machine, a pointer is attached to each support shaft that pivotally supports the left and right leveling arms, and the vertical movement position of the support shaft of each leveling arm by each pivot cylinder is indicated by the pointer and the scale. It is displayed mechanically.

[0004]

[Problems to be Solved by the Invention] The operator in the driver's seat reads the vertical position of the support shaft of each leveling arm from the scale indicated by each pointer to check the operating state of the screed. It is difficult to see because it is located far away from each other, and the pointers and scales of the pair of left and right leveling arms are provided separately on the left and right side surfaces of the traveling vehicle. At the same time, of course, we cannot know it, but we cannot know it accurately and easily.

The present invention provides a driving device capable of accurately and easily knowing the vertical positions of the support shafts of a pair of left and right leveling arms at the same time and therefore operating the laying machine in the best condition. The purpose is to

[0006]

In order to achieve the above-mentioned object, the present invention provides a pair of leveling arms on the left and right side surfaces of a traveling vehicle , the tip of which is a support shaft of a pivot cylinder.
Vertically freely mounted is pivotally supported respectively, the pair
In smoothing mat to screed the rear end of the leveling arm is mounted in the machine, as well as attached respectively upper and lower sensors for detecting the vertical position of the support shaft to each pivot cylinder, by the respective upper and lower sensor in the driver's seat of vehicles The upper and lower positions of each detected support shaft are divided into left and right, and at the same time,
And the current left and right calculated by the measuring device and arithmetic device
A display device for electrically displaying on the display screen together with the pavement thickness of No. 1 was provided.

[0007]

[Operation] When the support shaft is moved in each pivot cylinder,
Each upper and lower sensors respectively <br/> detecting the vertical position of the support shaft actuated. This detection result is divided into the left and right on the display screen of the display device installed in the driver's seat and is compared with the current left and right pavement thickness.
Electrically it is displayed in the same time together.

The operator seated in the driver's seat determines the vertical position of each of the left and right support shafts from the display screen in front of the current left and right pavement.
At the same time , according to the thickness, it is possible to know easily and accurately and to continue the operation better.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The attached drawings show an embodiment of an asphalt finisher equipped with a driving device according to the present invention.
A medium code 1 is a traveling vehicle of the asphalt-initiator AF. 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 rearward (rightward in FIG. 1) by a feeder at the lower part of the vehicle body, then spread evenly left and right by a screw, and spread by a pair of left and right screeds 5.

The left and right side surfaces of the traveling vehicle 1 are the same as the conventional ones.
Is provided with a pair of leveling arms 6 and 6.
The screed 5, at the rear end of the pair of leveling arms 6, 6.
5 is attached. A pair of leveling arms 6 ,
6 is a support shaft 7 provided on the substantially central side surface of the traveling vehicle 1 ,
7 respectively supported. Each support shaft 7 is vertically moved by a pivot cylinder 8. The basic structure of the asphalt finisher AF is well known.

Reference numeral 11 is a measuring device provided on each of the left and right sides. The measuring device 11 measures a first height sensor 13 provided at the tip of the measuring arm 12, a second height sensor 14 provided at the center of the measuring arm, and an inclination angle of the measuring arm 12. It is composed of a tilt sensor 15. The base end (right end in the figure) of the measuring arm 12 is pin-supported by the frame 5a supporting the screed 5, whereby the measuring arm 12 tilts evenly with respect to the screed 5.

Although various types of first and second height sensors 13 and 14 can be considered, a sensor utilizing ultrasonic waves is used here. Further, as shown in FIG. 3, the distance between the two sensors 13 and 14 is set to 1/2 of the distance M between the second distance sensor 14 and the rear end of the screed 5 (if it is a fraction of 1). , The screed 5 of both sensors 13, 14
The height H ₀ relative to is always set to a constant value regardless of the inclination of the screed 5, the measuring arm 12, and the like.

Reference numeral 17 is a distance sensor for calculating the travel distance provided at the lower end of the front part of the traveling vehicle 1, and reference numeral 18 is a vertical sensor attached to each pivot cylinder 8 for detecting the vertical position of each support shaft 7. To do.

Height sensors 13 and 14 and tilt sensor 1
An arithmetic unit 30 is connected to the distance sensor 5 and the distance sensor 17 (see FIG. 2). The arithmetic unit 30 is the height sensor 1
3, 14 and the inclination sensor 15 analog output,
An A / D (analog-digital) converter 31 for converting this into a digital output, and an I / O (input-input) to which each digital output of the A / D converter 31 and the distance sensor 17 is input.
Output) interface 32 and operation unit 3 that performs operations based on data from this I / O interface 32
3, a data storage unit 34 for inputting and storing the numerical value obtained by the arithmetic unit 33 and outputting the numerical value to the arithmetic unit, and an I / O interface 35 for processing the numerical value arithmetically operated by the arithmetic unit 33. It is configured. The signal output from the I / O interface 35 is sent to the electromagnetic valve 36 for adjusting the expansion and contraction of the pivot cylinder 8 and the display device 20.

The display device 20 is provided in a driver's seat 21 installed in the traveling vehicle 1. Display screen 2 of display device 20
An example of 0a is shown in FIG. Display device 20 is contacted to the upper and lower sensors 18, 18, the result calculated by the arithmetic unit 30 as described later, i.e., pavement thickness currently (in screen shop SoAtsushi), expected pavement thickness , Support shaft position (pivot in the screen) etc. simultaneously with the screed's surface pressure and sketches of the leveling arm and screed separately on the left and right
To display. In the display screen 20a, "speed" is the pavement speed, "mileage" is the distance paved so far, "crown" is the left and right slope of the pavement with a high central portion, and "slope" is the slope in the pavement direction. The degree and the "step" indicate the vertical difference between the pair of left and right screeds. In addition,
The display items are not limited to the above, and may be increased or decreased as necessary.

The computing device 30 causes the traveling vehicle 1 to travel the distance between the height sensors 13 and 14 (M / 2, where M is the distance between the second height sensor 14 and the screed 5). The required calculation is performed based on the measurement signals from the height sensors 13 and 14 measured at.

The main arithmetic contents of the arithmetic unit 30 are as follows. (1) Two measurement points P ₁ , P ₂ , P ₂ , P ₃ , P ₃ , P ₄ , which are simultaneously measured by the pair of height sensors 13, 14.
_{P 4, P 5, P 5} , P 6 ... height difference [delta] ₁ of, [delta] ₂ ... calculates the pavement thickness t ₁ of the (see FIG. 6) each measuring point P ₁ at the same time, P ₂ ......, t ₂ ... To calculate.

(2) Pavement thicknesses obtained by measuring the pavement thickness t ₁ ... by measuring the measurement points Q ₁ , Q ₂ , Q ₃ , Q ₄ ... on the existing pavement surface by introducing the least square method or the like. Reference straight line l
Calculate (y = ax + b) and calculate the expected pavement thickness at a given position in front of the screed.

(3) To determine the target pavement thickness position at a target point that is a predetermined distance M ahead of the screed 5, and to change the position of the screed 5 so as to eliminate the difference between this position and the position on the pavement thickness reference straight line l. To calculate the vertical operation amount L of the pivot cylinder 8.

Since the pavement thickness influences not only the inclination of the screed 5, but also the properties and supply amount of the asphalt mixture, the running speed of the vehicle, etc., are taken into consideration. Then, the command signal of the operation amount L of the pivot cylinder 8 calculated above is sent to the electromagnetic valve 36 interposed in the hydraulic circuit (not shown), and the electromagnetic valve 36 is operated, whereby the pivot cylinder 8 is moved. It is operated to expand and contract.

Here, two measurement points P ₁ , P ₂ , P ₂ , which are simultaneously measured by the pair of height sensors 13, 14,
Height difference δ ₁ , δ between P ₃ , P ₃ , P ₄ , P ₄ , P ₅ , P ₅ , P ₆ ...
₂ and a method of calculating the pavement thicknesses t ₁ , t ₂ ... At the respective measurement points P ₁ , P ₂ ... will be described with reference to FIG. The height difference δ is calculated by the following formula 1.

[0022]

## EQU1 ## δ = H ₂ − (H ₁ −Mtan θ ₁ )

Here, H ₁ : a value detected by the first height sensor H ₂ : a value detected by the second height sensor M: a distance θ ₁ between the first and second height sensors : Tilt of the measuring arm 12

The pavement thickness t is calculated by the following equation 2.

[0025]

## EQU2 ## t = H ₂₁ + δ-Mtan θ ₂ -H ₀

Here, H ₂₁ : value detected by the second height sensor δ: value calculated by the above formula (1) M: same as above θ ₂ : inclination of measuring arm H ₀ : height sensor Height difference between the and screed

The above equations (1) and (2) are shown for the sake of easy understanding of the method of calculating the height difference δ and the pavement thickness t, and the measuring device shown by the asphalt finisher AF shown in FIGS. 1 and 3 is used. 11 is slightly different. In order to actually measure with the measuring device 11 of the present embodiment, since both height sensors 13 and 14 are arranged at a distance of M / 2,
The height difference δ and the pavement thickness t for each same distance M / 2 are calculated (see FIG. 5).

In the above formulas (1) and (2), since the height difference δ and the pavement thickness t do not take into consideration the inclination θ, there are some differences from the actual values, but in practical use, Can be ignored.

Next, the operation of the operation device of the leveling machine according to the present invention constructed as described above will be described. Asphalt finisher AF is used for paving the road, while the traveling vehicle 1 is traveling at a constant speed in the same manner as before, while the asphalt mixture in the hopper 2 is fed to the screw by the feeder and spread evenly in front of the screed 5. Spread the mix with screed 5 and level it.

In the above, the traveling distance of the vehicle 1 is measured by the distance sensor 17, and the height from the roadbed surface is measured by the first and second height sensors 13 and 14 every time the traveling distance becomes M / 2. Then, the measurement result is calculated by the arithmetic unit 30.
Output to.

The arithmetic unit 30 calculates from the output signals of the height sensors 13 and 14, the distance sensor 17 and the inclination sensor 15
As described above, the height difference δ and the pavement thickness t are calculated. Then, based on these values, the pavement thickness reference straight line l: y = ax + b
Is calculated. When the pavement thickness reference straight line 1 is calculated, for example, the latest several points (Q ₁ , Q ₂ , Q in FIG. 6) of the existing pavement surface are calculated.
_3, calculated from Q 4 points _4).

Next, the arithmetic unit 30 calculates the expected pavement thickness at the target point distant from the screed 5 forward by the distance M from the height differences δ ₄ , δ _5, etc., and further on the pavement thickness reference straight line 1 at the target point. The vertical operation amount of the pivot cylinder 8 that eliminates the difference ε between the position of No. and the position of the target pavement thickness t ₀ is sent to the solenoid valve 36 via the I / O interface 35, and the inclination of the screed 5 is determined. To change. The estimated pavement thickness calculated by the arithmetic device 30, the vertical position of the support shaft 7 detected by the vertical sensor 18, and the like are displayed on the display screen 20a of the display device 20. The operator knows the control state and the like of the support shaft 7 from the display contents on the display screen 20a and uses it for driving.

The above is repeated every time the vehicle 1 travels the distance M / 2, so that the screed 5 is controlled so that the pavement thickness in front of the distance M always becomes an ideal value. In the apparatus of the illustrated embodiment, the estimated pavement thickness at a point 1.5M ahead of the screed 5 is also calculated and displayed on the display screen 20a. The expected pavement thickness closer to the support shaft 7 in the display screen 20a is that.

[0034]

As described above, in the operating device for a leveling machine according to the present invention, a pair of leveling arms are provided on the left and right side surfaces of the traveling vehicle , and the tips of the leveling arms serve as the support shafts of the pivot cylinders. vertically freely mounted is pivotally supported respectively, the
A machine leveling mat that screed rear end is mounted a pair of leveling arms, together with the upper and lower sensors above each pivot cylinder for detecting the vertical position of the support shaft is <br/> set with each of the traveling vehicle In the driver's seat, the vertical position of each support shaft detected by the above vertical sensors is divided into left and right.
At the same time and calculated by the measuring device and the arithmetic device
Since the display device for displaying a screen in an electrically displayed with the paving thickness of the current left and right are configured provided, the pair of upper and lower positions of the support axis of each leveling arm, which
Together with the current pavement thickness, which is closely related to, it is possible to know accurately and easily from the display screen of the display device at hand.
For this reason, it is possible to operate the leveling machine in the best condition to perform good paving.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an asphalt finisher equipped with a driving device of the present invention.

FIG. 2 is a block diagram of a computing device.

FIG. 3 is an explanatory diagram showing a relationship between a measuring device and a screed.

FIG. 4 is an explanatory diagram for obtaining a height difference of a roadbed and a pavement thickness.

FIG. 5 is an explanatory diagram for obtaining a height difference and a pavement thickness of a roadbed according to the embodiment.

FIG. 6 is an explanatory diagram of calculation of an expected pavement thickness.

FIG. 7 is a front view showing an example of a display screen of a display device.

[Explanation of symbols]

1 traveling vehicle 5 screed 6 leveling arm 7 support shaft 8 pivot cylinder 11 measuring device 18 up / down sensor 20 display device 20a display screen 21 driver's seat 30 computing device

Claims (1)

(57) [Scope of utility model registration request] The left and right side surfaces of the 1. A traveling vehicle, a pair of Reberi <br/> Nguamu is its its distal end to the support shaft of the pivot cylinder
In a leveling machine in which each of the pivot cylinders is pivotally supported and vertically mounted, and a screed is mounted at the rear ends of the pair of leveling arms, the vertical position of the support shaft is detected in each of the pivot cylinders. with upper and lower sensors are attached respectively to the driver's seat of the traveling vehicle is divided into right and left upper and lower positions of the support shaft detected by each of the upper and lower sensors simultaneously to
And the current calculated by the measuring device and the arithmetic unit
An operating device for a leveling machine, which is provided with a display device for electrically displaying on the display screen together with the left and right pavement thickness .