SU903460A1 - Device to road rollers for measuring road paving sag - Google Patents

Description

As sensor 1, any displacement transducer or pressure sensor can be used, for example a displacement transducer in the form of a microswitch with nodes controlling the output of the measuring rod and the initial stroke of the sensing element.

The device works as follows.

When the road roller starts moving from the moment of contact of the spring-loaded measuring rod with the road surface, the contact of the microswitch (sensor 1) closes and thus provides an electrical signal through the collector to the input of the imager 2 pulses (electrical signal supply bus to sensor 1 not shown) .

The electrical signal from the output of the puller 2 pulses serves as a permissive signal for the passage of pulses from the generator of 5 pulses through the circuit 4 to match the input of the electronic counter 7,

The electronic counter 7 is filled with pulses until the measuring rod of the sensor 1 comes out of the contact area with the road surface, because at the moment when the roller of the roller rolls out of the said area, the microswitch contact opens and, therefore, the release of the enable signal to the input of circuit 4 is a match.

Thus, information is recorded in the electronic counter 7 proportional to the amount of deflection of the road surface, moreover, at a given speed of movement of the road; roller during measurement time.

To eliminate the influence of the speed of the roller on the determination of the amount of deflection, there is a speed sensor b, containing, for example, a tachogenerator connected by an output shaft to the axis of the drum on which sensor 1 is installed, and any of the known voltage converters.

The speed sensor b continuously measures the rotational speed of the drum and changes the pulse frequency of the generator 5 as it changes, and decreases with an increase in speed and increases the pulse frequency of this generator with decreasing speed, thus achieving independence of the measured value.

from the magnitude of the speed of the rink.

The device is calibrated by setting the initial frequency of the generator 5 pulses when the roller is moving along the road surface with a known deflection at a given speed.

To take into account the systematic error arising due to the different initial output of the spring-loaded measuring rod of the sensor 1, the roller is moved on a hard road surface.

The mentioned systematic error is taken into account in block 8 of registration, which also generates a cyclic pulse for clearing the content of the electronic counter 7 from the content after recording the information about the amount of deflection (not

Q is shown).

This device will improve the accuracy of determining the deflection of the road surface, obtain a certain saving of road building materials, increase the utilization rate of the roller, and also save fuel and lubricants.

Invention Formula

A device for road rollers for determining the deflection of a road cover comprising a displacement sensor and a recording unit, characterized in that, in order to improve the determination accuracy, it is equipped with a pulse driver, a coincidence circuit, a counter, a pulse generator, a speed sensor and a collector unit, A displacement sensor is mounted on the upper roller of the roller and is connected through the collector unit and the pulse shaper.

to one input of the matching circuit, the other input of which is connected via a pulse generator to the speed sensor, and the output of the matching circuit is connected to the input of the counter, the output of which is connected to the recording unit.

sources of information taken into account in the examination

1. USSR author's certificate No. 185361, cl. E 01 C 23/01, 1965.

2. Construction and operation of roads. Express information. M., No. 43, 1977.

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Claims (1)

Claim A device for road rollers for determining the deflection of the road surface, comprising a displacement sensor and a registration unit, characterized in that, in order to increase the accuracy of determination, it is equipped with a pulse shaper, a matching circuit, a counter, a pulse generator, a speed sensor and a current collector, the displacement sensor it is mounted on a roller of a skating rink and is connected through a collector unit and a pulse shaper to one input of the matching circuit, the other input of which is connected through a pulse generator to a speed sensor And coincidence circuit output connected to the counter input of which the output is connected to the recording unit.