CN100465589C - Concrete pump real time flow measurement method and apparatus - Google Patents

Abstract

The invention discloses a measuring method and device of concrete pump real time flux. The invention respectively measures the down-stream propagation time and the refluent propagation time of ultrasonic in a concrete piping, calculates the difference value of the down-stream propagation time and the refluent propagation time and measures the flow speed of the concrete in a concrete transfer piping by respectively arranging two acoustic wedges with an ultrasonic sensor on a concrete transfer piping and using a switch control module to lead two ultrasonic sensors to be in a launching state and a receiving state alternately and to be combined with a high-frequency oscillation module and a high-speed counting module. As the section surface of the concrete transfer piping is a fixed value, the concrete pump real time flux can be measured according to the measured concrete flow speed. When measuring, the flow field distribution of the concrete in the concrete transfer piping is not influenced and the measuring accuracy is almost not influenced by parameters like temperature, pressure and concentration, etc. of the concrete.

Description

Concrete pump real time flow measurement method and device

Technical field

The present invention relates to the method and the device of flow measurement, especially relate to a kind of concrete pump real time flow measurement method and device.

Background technology

Concrete stirring and pumping are normally carried out in the two places of apart from each other, and stirring, transportation and construction party be Chang Weisan different unit also.A side who is in a disadvantageous position because of information asymmetry in the architecture machinery rental industry---construction user side---proposes to be badly in need of the deficiency that flow measuring system (mainly being the flow measuring system with pump truck) remedies this respect.In the demand that also exists aspect the evaluation of pump (car) monitoring running state, construction management and construction quality, pump truck quality flow measuring system.Concrete flow measurement technology has become one in construction implement engineering practical application technical matters that needs to be resolved hurrily, with the exploitation of the flow measurement device of car and control system, statistic management system, be considered as the significant function of pump truck of new generation by domestic each main building machinery manufacturing enterprise.

The direct research of relevant concrete pump flow metering technology both at home and abroad rarely has report, just using or studying among metering method and technical scheme comprise:

(1) method of utilizing displacement transducer, switch sensor to carry out flow metering.This method adopts switch sensor that the pump stroke number of times is counted, and carries out the metering of piston concrete pump (steam piano) flow according to the pumping efficiency of setting according to experience.Owing to can not get rid of the influence that " idle motion " and top hole pressure change on metering method, there is big error in dipping in this method.

(2) utilize the hydraulic system signal to carry out the method for flow metering.This method utilizes the reciprocal corresponding relation of the pressure signal of hydraulic system and piston cylinder to carry out the flow metering of concrete pump.Though this method has simple and reliable characteristics, still rest in essence on the reciprocal time of measuring hydraulic drive piston, and can not distinguish back pressure signal, the precision under complex working condition is very limited.

(3) based on surveying the metering method that sucks volumetric efficiency.Suck volumetric efficiency by the field measurement concrete cylinder and calculate the average volumetric efficiency that sucks, and measure the number of stroke of piston per minute when range of concrete cylinder, according to the average volumetric efficiency that sucks the concrete pump flow is measured then.This method principle is simple, can reduce the error of the actual mean flow rate that causes because of coefficient of flow is inaccurate.But require to have special measuring channel, also increased operating personnel's labor capacity simultaneously.Not only expend time in, frequent mensuration is also unrealistic.

Summary of the invention

The object of the present invention is to provide a kind of concrete pump real time flow measurement method and device.This device can calculate the actual pump discharge of concrete pump.

The technical solution used in the present invention is as follows:

One. a kind of concrete pump real time flow measurement method:

By being installed in two sound wedges on the concrete conveying pipe respectively, two ultrasonic sensors are installed in respectively in two sound wedges, switch control module makes two ultrasonic sensors alternately be in emission state and accepting state, combine with high frequency oscillation module and high speed counting module, measure following current travel-time and the adverse current travel-time of ultrasound wave in concrete duct respectively, calculate the difference in following current travel-time and adverse current travel-time, measure concrete conveying pipe inner concrete flow velocity, because the sectional area of concrete conveying pipe is a definite value, just can measure concrete pump real time flow according to the concrete flow velocity that records; The concrete steps of this method are as follows:

1) two sound wedges is installed in respectively on the concrete conveying pipe, two ultrasonic sensors are installed in respectively in two sound wedges;

2) switch control module is connected with two ultrasonic sensors respectively by emission/reception handover module, makes two ultrasonic sensors alternately be in emission state and accepting state;

3) high frequency oscillation module is connected with DSP with high speed counting module, produces emission ultrasound wave trigger pulse, and measure following current travel-time and the adverse current travel-time of ultrasound wave in concrete duct;

4) calculate the difference in following current travel-time and adverse current travel-time, measure concrete conveying pipe inner concrete flow velocity,, realize measurement concrete pump real time flow according to the concrete flow velocity that records because the sectional area of concrete conveying pipe is a definite value:

$Q=\mathrm{S\&upsi;}=\frac{{\mathrm{<figure-callout\; id="2"\; label="Sc"\; filenames="C200710164413E00092.png"\; state="\{\{state\}\}">Sc</figure-callout>}}^2}{2L\sin \mathrm{\&theta;}}\&CenterDot;\mathrm{\&Delta;t}$

In the formula:

Actual flow (the m that the Q-concrete pump is total ³/ s); Sectional area (the m of S-concrete conveying pipe ²); V-concrete flow velocity (m/s); The velocity of propagation (m/s) of c-ultrasound wave in concrete; L-ultrasonic sensor installation interval (m); θ-hyperacoustic incident angle (rad); The difference (s) in Δ t-following current travel-time and adverse current travel-time.

Two. a kind of concrete pump real time flow measurement mechanism:

Comprise concrete pump; Also comprise the ultrasonic emitting sensor, ultrasound wave receiving sensor, two sound wedges, concrete conveying pipe, emission/reception handover module, transmitter module, receiver module, switch control module, signal processing module, high frequency oscillation module, high speed counting module, temperature compensation module, and flow display module and DSP; First wedge places concrete conveying pipe one side, second sound wedge places concrete conveying pipe one side, the first ultrasonic emitting sensor is installed in first wedge, the second ultrasonic emitting sensor is installed in the second sound wedge, emission/reception handover module is connected with the ultrasound wave receiving sensor with the first ultrasonic emitting sensor respectively, DSP respectively with switch control module, signal processing module, high frequency oscillation module, high speed counting module, temperature compensation module is connected with the flow display module, transmitter module is connected with switch control module with emission/reception handover module respectively, receiver module respectively with emission/reception handover module, switch control module is connected with signal processing module.

Described first wedge and the coaxial tilting respectively or vertical concrete conveying pipe both sides that place of second sound wedge.

The beneficial effect that the present invention has is:

By measuring following current travel-time and the adverse current travel-time of ultrasound wave in concrete duct, calculate the difference in following current travel-time and adverse current travel-time, measure concrete conveying pipe inner concrete flow velocity, concrete pump real time flow is measured.Do not influence concrete Flow Field Distribution in the concrete conveying pipe during measurement, and accuracy of measurement is subjected to concrete temperature, pressure hardly, concentration is isoparametric influences.

Description of drawings

Fig. 1 is apparatus of the present invention general structure synoptic diagram.

Fig. 2 is apparatus of the present invention hardware configuration synoptic diagram.

Fig. 3 is apparatus of the present invention software configuration synoptic diagram.

Fig. 4 is apparatus of the present invention workflow synoptic diagram.

Among the figure: 1, ultrasonic emitting sensor, 2, the ultrasound wave receiving sensor, 3, the sound wedge, 4, sound wedge, 5, concrete conveying pipe, 6, emission/reception handover module, 7, transmitter module, 8, receiver module, 9, switch control module, 10, signal processing module, 11, high frequency oscillation module, 12, high speed counting module, 13, temperature compensation module, 14, flow display module, 15, DSP, 16, concrete pump.

Embodiment

As shown in Figure 1 and Figure 2, the present invention includes concrete pump 18; Also comprise ultrasonic emitting sensor 1,2, two sound wedges of ultrasound wave receiving sensor 3,4, concrete conveying pipe 5, emission/reception handover module 6, transmitter module 7, receiver module 8, switch control module 9, signal processing module 10, high frequency oscillation module 11, high speed counting module 12, temperature compensation module 13, and flow display module 14 and DSP15; First wedge 3 places concrete conveying pipe 5 one sides, second sound wedge 4 places concrete conveying pipe 5 one sides, the first ultrasonic emitting sensor 1 is installed in first wedge 3, the second ultrasonic emitting sensor 2 is installed in the second sound wedge 4, emission/reception handover module 6 is connected with ultrasound wave receiving sensor 2 with the first ultrasonic emitting sensor 1 respectively, DSP15 respectively with switch control module 9, signal processing module 10, high frequency oscillation module 11, high speed counting module 12, temperature compensation module 13 is connected with flow display module 14, transmitter module 7 is connected with switch control module 9 with emission/reception handover module 6 respectively, receiver module 8 respectively with emission/reception handover module 6, switch control module 9 is connected with signal processing module 10.

Described first wedge 3 and second sound wedge 4 coaxial tilting respectively or vertical concrete conveying pipe 5 both sides that place.

As shown in Figure 3, software systems of the present invention comprise data acquisition and processing (DAP) module, self check and fault processing module, parameter setting and modified module, control survey and communication module and data presentation and print module.

The course of work of the present invention is as follows:

In conjunction with Fig. 2 and Fig. 4, start measuring system, system at first carries out self check, carries out the setting of various measurement parameters then.Switch control module 9 makes ultrasonic sensor 1 and 2 alternately be in the state of transmitting and receiving, and DSP sends and controls signal to high frequency oscillation module 11, produces emission ultrasound wave trigger pulse, and high speed counting module 12 picks up counting simultaneously.System receives behind the ultrasonic signal closing high-speed counting module 12 immediately, calculates hyperacoustic travel-time simultaneously.Various measurement parameters are gathered in software control in real time, carry out error correction and data processing, calculate real-time traffic and integrated flux.

As shown in Figure 2,, when ultrasonic sensor 1 as transmitting terminal, ultrasonic sensor 2 can record the time that the ultrasound wave following current is propagated during as receiving end; When ultrasonic sensor 2 as transmitting terminal, ultrasonic sensor 1 can record the time that the ultrasound wave adverse current is propagated during as receiving end.Make that c is the velocity of propagation of ultrasound wave in static concrete, v is the speed that concrete flows in the conveyance conduit, and θ is hyperacoustic incident angle, and then the travel-time during the ultrasound wave following current is:

${\mathrm{<figure-callout\; id="12"\; label="t"\; filenames="C200710164413E00092.png"\; state="\{\{state\}\}">t</figure-callout>}}_{12}=\frac{L}{c+\mathrm{\&upsi;}\sin \mathrm{\&theta;}}---\left(1\right)$

Travel-time during the ultrasound wave adverse current is:

$t_{21}=\frac{L}{c-\mathrm{\&upsi;}\sin \mathrm{\&theta;}}---\left(2\right)$

Then the ultrasound wave mistiming suitable, adverse current is:

$\mathrm{\&Delta;t}=\frac{2\mathrm{L\&upsi;}\sin \mathrm{\&theta;}}{c^2-{\mathrm{\&upsi;}}^2{\sin }^2\mathrm{\&theta;}}---\left(3\right)$

(be about 3650～4900m/s), and concrete flowing velocity in conveyance conduit is about 5.6m/s, so c because the velocity of propagation c of ultrasound wave in concrete is very big ²Be far longer than v ²Sin ²θ, then formula (3) can be write as:

$\mathrm{\&upsi;}=\frac{{\mathrm{\&Delta;<figure-callout\; id="2"\; label="tc"\; filenames="C200710164413E00092.png"\; state="\{\{state\}\}">tc</figure-callout>}}^2}{2L\sin \mathrm{\&theta;}}---\left(4\right)$

Because the sectional area S of concrete conveying pipe is a definite value, just can obtain concrete flow according to the flow velocity v that records:

$Q=\mathrm{S\&upsi;}=\frac{{\mathrm{<figure-callout\; id="2"\; label="Sc"\; filenames="C200710164413E00092.png"\; state="\{\{state\}\}">Sc</figure-callout>}}^2}{2L\sin \mathrm{\&theta;}}\&CenterDot;\mathrm{\&Delta;t}---\left(5\right)$

Device such as ultrasonic emitting sensor T/R40, ultrasound wave receiving sensor T/R40, transmitter module RBA-24, receiver module RBA-23, high frequency oscillation module FU-19, temperature compensation module 143-131A, signal processing module KLM-4701, switch control module JA-9208ZN, emission/reception handover module J-EI6062, high speed counting module 4080D, flow display module LCM141 and DSP that the present invention adopts all can buy on the market.

Claims (3)

1. concrete pump real time flow measurement method, it is characterized in that: by being installed in two sound wedges on the concrete conveying pipe respectively, two ultrasonic sensors are installed in respectively in two sound wedges, switch control module makes two ultrasonic sensors alternately be in emission state and accepting state, combine with high frequency oscillation module and high speed counting module, measure following current travel-time and the adverse current travel-time of ultrasound wave in concrete duct respectively, calculate the difference in following current travel-time and adverse current travel-time, measure concrete conveying pipe inner concrete flow velocity, because the sectional area of concrete conveying pipe is a definite value, just can measure concrete pump real time flow according to the concrete flow velocity that records; The concrete steps of this method are as follows:

1) two sound wedges is installed in respectively on the concrete conveying pipe, two ultrasonic sensors are installed in respectively in two sound wedges;

2) switch control module is connected with two ultrasonic sensors respectively by emission/reception handover module, makes two ultrasonic sensors alternately be in emission state and accepting state;

3) high frequency oscillation module is connected with DSP with high speed counting module, produces emission ultrasound wave trigger pulse, and measure following current travel-time and the adverse current travel-time of ultrasound wave in concrete duct;

4) calculate the difference in following current travel-time and adverse current travel-time, measure concrete conveying pipe inner concrete flow velocity,, realize measurement concrete pump real time flow according to the concrete flow velocity that records because the sectional area of concrete conveying pipe is a definite value:

$Q=\mathrm{S\&upsi;}=\frac{{\mathrm{Sc}}^2}{2L\sin \mathrm{\&theta;}}\&CenterDot;\mathrm{\&Delta;t}$

In the formula:

Actual flow (the m that the Q-concrete pump is total ³/ s); Sectional area (the m of S-concrete conveying pipe ²); υ-concrete flow velocity (m/s); The velocity of propagation (m/s) of c-ultrasound wave in concrete; L-ultrasonic sensor installation interval (m); θ-hyperacoustic incident angle (rad); The difference (s) in Δ t-following current travel-time and adverse current travel-time.

2. a concrete pump real time flow measurement mechanism comprises concrete pump (18); It is characterized in that: also comprise ultrasonic emitting sensor (1), ultrasound wave receiving sensor (2), two sound wedges (3,4), concrete conveying pipe (5), emission/reception handover module (6), transmitter module (7), receiver module (8), switch control module (9), signal processing module (10), high frequency oscillation module (11), high speed counting module (12), temperature compensation module (13), and flow display module (14) and DSP (15); First wedge (3) places concrete conveying pipe (5) one sides, second sound wedge (4) places concrete conveying pipe (5) one sides, the first ultrasonic emitting sensor (1) is installed in first wedge (3), the second ultrasonic emitting sensor (2) is installed in the second sound wedge (4), emission/reception handover module (6) is connected with ultrasound wave receiving sensor (2) with the first ultrasonic emitting sensor (1) respectively, DSP (15) respectively with switch control module (9), signal processing module (10), high frequency oscillation module (11), high speed counting module (12), temperature compensation module (13) is connected with flow display module (14), transmitter module (7) is connected with switch control module (9) with emission/reception handover module (6) respectively, receiver module (8) respectively with emission/reception handover module (6), switch control module (9) is connected with signal processing module (10).

3. a kind of concrete pump real time flow measurement mechanism according to claim 2 is characterized in that: described first wedge (3) and coaxial tilting respectively or vertical concrete conveying pipe (5) both sides that place of second sound wedge (4).

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