CN2517627Y

CN2517627Y - Tester for vehicle load compression

Info

Publication number: CN2517627Y
Application number: CN 01249239
Authority: CN
Inventors: 杨济安
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-07-06
Filing date: 2001-07-06
Publication date: 2002-10-23
Anticipated expiration: 2011-07-06

Abstract

The utility model relates to a vehicle load compaction degree detection device, which solves the problem of timely detection of the roadbed compaction degree in the superhighway construction. The utility model comprises a power supply circuit, an oscillation amplification circuit and a shaping digital module converting circuit, and piezoelectric ceramic is adopted as an acceleration sensor, and through the amplification circuit, the shaping digital module circuit and two-point adjustment adopted, the linearity of the space interval is made in conformity to the requirements. The instruction accuracy of the compaction degree is adjusted through subtraction. The utility model has simple structure, fast dynamic system response, good stability, accurate reflection, high detection precision, and accurate and intuitive detection, thus the working efficiency is increased duplicately. The utility model fills the blank of the practical application of the technology in domestic.

Description

Vehicle loaded densification degree detector

Technical field

The utility model relates to a kind of electronic equipment, and feature is a kind of vehicle loaded densification degree detector.

Background technology

At present, in expressway construction, a directly main indication-degree of compaction of reflection roadbed quality is arranged.China continues to use traditional filling micromicrofarad and core cutter method etc. and takes out experimental tests method check degree of compaction in construction, speed is slow, and the personnel that take are many, and wear and tear expense is big.Human element is also many, becomes a principal element of restriction construction speed, also is difficult to comprehensive guarantee highway subgrade quality.Still may there be inferior-quality hidden danger in the highway section that (because of it is a kind ofly to adopt the point sampling mode, and the road surface is big, can not the some point all to) promptly calculates acceptance(check).

Summary of the invention

It is a kind of simple in structure that the purpose of this utility model is to provide, and technical standard is good, and the system dynamics response is fast, and stability is good, the high vehicle loaded densification degree detector of reflection accuracy.

The purpose of this utility model is achieved through the following channels: vehicle loaded densification degree detector, it comprises power circuit, oscillator-amplification circuit and shaping D/A converting circuit, it obtains signal by sensor SEN and delivers to U3A the 3rd pin by C3, amplify the back and output to OUT1 from 1 pin, deliver to 3 pin of U5A by change-over swith S1, amplify the back and delivers to 2 pin of U7B and 6 pin of U5B respectively through C3 from the output of 1 pin;

2 pin by U7B, after 6 pin of delivering to U7D from the output of 1 pin of U7B after the shaping obtain oppositely, 6 pin of delivering to U6 from the 7 pin output of U7C carry out pressing frequently the conversion back to deliver to 12 pin of U7A from the output of 1 pin, from the output of 14 pin, deliver to the vibration frequency of operation that the indication dial plate shows roller behind the emitter following through R31;

Deliver to 6 pin of U5B by R11, deliver to 10 pin of U5C after voltage gain and the rectification, from the output of the 8th pin, show degree of compaction to dial plate behind the emitter following through R19;

The scalable signal generation circuit of being made up of U8A, U8B etc. provides a calibration signal for the degree of compaction adjustment;

Produce an AC signal by UBA vibration, its oscillation frequency is adjusted by R53 and is changed, and delivers to 13 pin of U8B from the output of 8 pin, amplifies the back and outputs to OUT2 from 14 pin, and the output size is adjusted by RW2 and changed;

The DC regulated power supply of being made up of U11, M1, T2, U9, U10 etc. provides working power for complete machine.

The utility model vehicle loaded densification degree detector has following characteristics: 1. adopting piezoceramic is acceleration pick-up, when vibrating roller is constructed with the certain frequency vibration, when its pinch roller clashes into different degree of compaction road surface, can produce corresponding different acceleration/accels, and this acceleration/accel has applied cooresponding mechanical force to piezoceramic, and this mechanical force makes sensor export cooresponding electric signal, the frequency of electric signal is consistent with the frequency of vibrating wheels, after frequency is carried out the conversion of frequency pressure, just can indicate the oscillation frequency of this roller.In addition, degree of compaction is bigger, and is bigger to vibrating wheels and effect, thereby the acceleration/accel that produces is bigger, thereby the electric signal that obtains is stronger, and the electric signal that conversion is got is to amplify, after linear, precision handles, can show cooresponding degree of compaction.2. adopt 2 adjustings (by RW1, RW3) to make the linearity in 90%-95% interval meet national ministerial standard and requirement.3. adopt to adjust RW1 and change magnification factor at the corresponding levels, make the drive pressure solidity test indicator index lattice that move import the indicated actual degree of compaction official post sensor OUT1 of required voltage difference and every lattice at IN point to order the cooresponding voltage difference that produced consistent.4. the 33HZ that adopts U8A, U8B circuit composition is from the adjustable AC signal of 0-IV.Enter from S1 that the degree of compaction adjustment for this machine provides more accurate signal behind the IN, make roller at random accurate adjustment of loaded densification degree detector be achieved.5. according to the standing order of Ministry of Communication, adjusting the highway degree of compaction standard is 90%-95%, therefore, makes the indication of degree of compaction dial plate from 80%-100%, thereby makes the readable precision of indication bring up to 0.2% from 1%.

Description of drawings

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model schematic circuit diagram.

The specific embodiment

As shown in Figure 1 and Figure 2, it is acceleration sensor that the utility model vehicle loaded densification degree detector adopts piezoceramic, because piezoceramic has the function of mechanical energy and the mutual conversion of electric energy, when sensor SEN obtains outputing to OUT1 from 1 pin signal is delivered to the amplification of U3A the 3rd pin by C3 after, deliver to 3 pin of U5A by change-over swith S1, amplify U7B is delivered in the back through C3 from the output of 1 pin 2 pin, after 6 pin of delivering to U7D from the output of 1 pin of U7B after the shaping obtained shaping, 6 pin of delivering to U6 from the 7 pin output of U7C carried out pressing frequently the conversion back to deliver to 12 pin of U7A from the output of 1 pin.From the output of 14 pin, deliver to the vibration frequency of operation that the indication dial plate shows roller behind the emitter following through R31; Simultaneously, sensor number deliver to 6 pin of U5B from the 1 pin output of U5A through C3, R11 through the preposition back of amplifying, deliver to 10 pin of U5C after voltage gain and the rectification, behind the emitter following from the output of the 8th pin, through R19 to dial plate demonstration degree of compaction; The adjustable AC signal generation circuit of being made up of U8A, U8B etc. provides a more accurate signal for the degree of compaction adjustment.Loaded densification degree detector is installed in roller, and recording degree of compaction is 88.8% o'clock, and sensor is output as 340MV; When degree of compaction was 92.1%, sensor was output as 400MV; In more accurate position, adjusting RW2, to make the S1 mouth be 340MV, adjusts RW3 and make degree of compaction be designated as 88.8% with 1 dozen of revolving die switch S; Adjust RW2 and make S1 be output as 400MV, adjust RW1, make degree of compaction be designated as 92.1%, adjust repeatedly, up to 88.8%-340MV, 92.1%-400MV is corresponding fully, and its precision satisfies the error limit of degree of compaction 0.5%; UBA vibration produces an AC signal, and then its oscillation frequency is adjusted by R53 and changed, and delivers to 13 pin of U8B from the output of 8 pin, amplifies the back and outputs to OUT2 from 14 pin, and the output size is adjusted by RW2 and changed.The DC regulated power supply of compositions such as U11, M1, T2, U9, U10 provides working power for complete machine.

Claims

1. vehicle loaded densification degree detector, it comprises power circuit, oscillator-amplification circuit and shaping D/A converting circuit, it is characterized in that: obtain signal by sensor SEN and deliver to U3A the 3rd pin by C3, amplify the back and output to OUT1 from 1 pin, deliver to 3 pin of U5A by change-over swith S1, amplify the back and delivers to 2 pin of U7B and 6 pin of U5B respectively through C3 from the output of 1 pin;