CN102182136B - Road Section Measuring Instrument - Google Patents

Abstract

The invention relates to a road section measuring instrument, belonging to the field of road surface measurement; a road section measuring instrument, comprising a guide rail; a guide rail bracket supporting the guide rail; Driving device; the driving device includes power equipment, a transmission mechanism, a bracket, and a walking wheel; a displacement sensor installed on the bracket includes a lateral displacement sensor and a longitudinal displacement sensor; Steering switch, the two ends of the guide rail are provided with a steering switch baffle; it is characterized in that: the displacement sensor is a non-contact displacement sensor; the invention has high measurement accuracy, simple structure, and the output digital signal is conducive to reuse, and the measurement conditions are not required. High, the instrument is light and easy to move.

Description

Road Section Measuring Instrument

technical field

The invention relates to a road section measuring instrument, which belongs to the field of road surface measurement.

Background technique

The road section measuring instrument is an instrument used to measure the geometric shape of the road surface or building section. At present, the known road section measuring instrument adopts the method of mechanical measurement. The instrument includes wooden double-row guide rails. Chains are installed on the guide rails. The guide rails and the brackets are connected by chains. With a pen, the measurement method is that the driving device drives the bracket to move on the chain of the wooden double-row guide rail, and drives the roller connected to the bracket to slide on the section, so that the pen connected to the bracket can draw the parallel trajectory of the probe movement, and then adjust the trajectory Carry out analysis and draw the cross-sectional geometry with the pen. The disadvantages of this instrument are:

1. There are many inaccurate reasons for mechanical measurement. Because the roller is used, there may be pits on the road surface that are smaller than the diameter of the roller, resulting in inaccurate measurement; because it is a contact measurement, there are also requirements for the material of the section, which cannot be adapted All cross-sections.

2. There may be inaccuracies in the mechanical drawing, and the precision is not high.

3. The requirements for measurement conditions are relatively high, and the requirements for paper and pens are also relatively high.

4. The measurement process takes a long time, and it needs to go through several processes such as measurement, analysis, and drawing.

5. Due to the inconvenient assembly and transportation of wooden guide rails and chains, pens, paper, probes, etc., the movement of the instrument is inconvenient.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a road section measuring instrument with high measurement accuracy, easy signal processing, low measurement condition requirements, short measurement time and convenient movement.

The technical solution provided by the present invention is: a road section measuring instrument, comprising a guide rail; a guide rail bracket supporting the guide rail; a drive device installed on the guide rail and reciprocating linearly along it; the drive device It includes power equipment, a transmission mechanism, a bracket, and a walking wheel; a displacement sensor installed on the bracket: including a lateral displacement sensor and a longitudinal displacement sensor; a steering switch installed on the guide rail to make the driving device change the direction of motion. There is a steering switch baffle; it is characterized in that: the displacement sensor is a non-contact displacement sensor;

The beneficial effects of the present invention are: the signal output to the PC terminal after being transmitted to the terminal board by the lateral displacement sensor and the longitudinal displacement sensor is a digital signal, which is easier to process, and the non-contact measurement displacement will be more accurate, the measurement steps are short, and the measurement is simple .

Further, considering the problem of measurement accuracy, the longitudinal displacement sensor is a laser displacement sensor.

The beneficial effect of using the laser displacement sensor is: the accuracy of laser measurement is 0.00005m, which is much higher than the 0.005-0.001m required by the national section measurement accuracy, and the laser measurement is non-contact measurement, with strong anti-interference ability and wider adaptability.

Further, considering issues such as cost and measurement accuracy, the lateral displacement sensor is a rotary encoder.

Further, considering the selection of the guide rail, the guide rail is made of section steel for the sake of lighter weight, level, and uniform friction force.

The beneficial effect of using the section steel is that the section steel has good mechanical properties, and the assembly and transportation are simpler, achieving the effect of convenient movement.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In Fig. 1, the present embodiment is provided with laser displacement sensor 1, and laser displacement sensor 1 is fixed on the bottom end of bracket 11, and guide rail 5 is connected with stepping motor driver 8 and stepping motor 9 through driving wheel 7 and driven wheel 10, and laser The displacement sensor 1, the rotary encoder 6, the stepping motor driver 8, and the stepping motor 9 are connected to the terminal board 2 respectively, the terminal board 2 is connected to the power supply 3, and a steering switch block 12 is provided at both ends of the guide rail 5.

When the present invention is in use, the slidable whole composed of laser displacement sensor 1, bracket 11, stepping motor driver 8, stepping motor winding 9, rotary encoder 6, driving wheel 7, driven wheel 10, and steering switch 4 performs reciprocating Movement, after each one-way stroke is completed, touch the steering switch 4, the steering switch 4 triggers the rotary encoder 6, the incoming pulse signal of the rotary encoder 6 enters the stepping motor driver 8, and the stepping motor driver 8 controls the stepping motor winding 9 to drive The driving wheel 7 allows the slidable whole to reciprocate again. Since the laser displacement sensor 1 scans the section at a constant speed during the movement, the rotary encoder 6 determines the abscissa of the scanning content of the laser longitudinal displacement sensor, and the scanning content of the laser displacement sensor 1 determines the vertical coordinate. The signal is connected to the PC terminal through the terminal block 2.

Using this method, the measurement accuracy is high, and the cross-section measuring instrument has high measurement accuracy, easy signal processing, low measurement condition requirements, convenient movement, and short measurement time.

The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the structure of the present invention, some deformations and improvements can also be made, such as:

1. Grind the driven wheel to increase friction to maintain the accuracy of horizontal reciprocating motion;

2. Transform the laser displacement sensor into an acoustic displacement sensor;

3. Transform the rotary encoder into an acceleration displacement sensor, and determine the abscissa by the method of obtaining the displacement by 2 times of integration of the acceleration;

4. Transform the rotary encoder into a lateral laser displacement sensor, and directly measure the displacement to determine the abscissa.

These should also be regarded as the protection scope of the present invention, and these will not affect the effect of the present invention and the practicability of the patent.

Claims (4)

1. a road section measuring instrument comprises a guide rail; The rail brackets of the described guide rail of one supporting; One is installed on the described guide rail and along it and makes the drive unit of straight reciprocating motion; Described drive unit comprises power-equipment, transmission mechanism, support and road wheel; Be installed in the displacement transducer on the described support: comprise lateral displacement sensor and length travel sensor; Be installed on the guide rail and make drive unit change the pole changer of the direction of motion, the guide rail two ends are provided with the pole changer baffle plate; It is characterized in that: described displacement transducer is non-contact displacement transducer.

2. road section measuring instrument according to claim 1, it is characterized in that: described length travel sensor is laser displacement sensor.

3. according to claim 1 or 2 described road section measuring instruments, it is characterized in that: described lateral displacement sensor is rotary encoder.

4. road section measuring instrument according to claim 1, it is characterized in that: described guide rail is shaped steel.

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