CN100573057C - Piston type concrete pump real time flow measurement method and device - Google Patents

Abstract

The invention discloses a kind of piston type concrete pump real time flow measurement method and device.Be installed in two sound wedges that ultrasonic emitting sensor and ultrasound wave receiving sensor are housed on the concrete conveying pipe respectively, the ultrasonic emitting sensor is launched the ultrasound wave of certain intensity by the concrete that transmitter module flows in concrete conveying pipe, the particle that ultrasound wave is moved with concrete reflexes to the ultrasound wave receiving sensor.Produce difference on the frequency between reflective sound wave that receiver module receives by the ultrasound wave receiving sensor and the emission sound wave, this difference on the frequency is proportional to the concrete flow velocity, therefore can calculate the concrete flow velocity according to difference on the frequency.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.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

Piston type 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 piston type 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, ultrasonic emitting sensor and ultrasound wave receiving sensor are installed in respectively in two sound wedges, the ultrasonic emitting sensor is launched the ultrasound wave of certain intensity by the concrete that ultrasonic transmit circuit flows in concrete conveying pipe, the particle that ultrasound wave is moved with concrete reflexes to the ultrasound wave receiving sensor.Produce difference on the frequency between reflective sound wave that the ultrasound wave receiving circuit receives by the ultrasound wave receiving sensor and the emission sound wave, this difference on the frequency is proportional to the concrete flow velocity, therefore can calculate the concrete flow velocity according to difference on the frequency.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 its method are as follows:

1) concrete conveying pipe is inserted in the pump concrete conveyance conduit, two sound wedges are installed in respectively on the concrete conveying pipe, ultrasonic emitting sensor and ultrasound wave receiving sensor are installed in respectively in two sound wedges;

2) ultrasonic transmit circuit is connected with the ultrasonic emitting sensor, makes the ultrasonic emitting sensor be in emission state always;

3) the ultrasound wave receiving circuit is connected with the ultrasound wave receiving sensor, receives the signal of ultrasound wave receiving sensor output always;

4) high-frequency oscillating circuits is connected with DSP, produces emission ultrasound wave trigger pulse;

5) signal processing circuit is connected with the ultrasound wave receiving circuit, the reflective sound wave that the ultrasound wave receiving circuit receives is handled with the emission sound wave;

6) difference on the frequency between calculating reflective sound wave and the emission sound wave obtains concrete flowing 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;

$Q=\mathrm{S\υ}=\frac{\mathrm{Sc}}{2\cos \mathrm{\θ}\·f_S}\·\mathrm{\Δf}$

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); θ-ultrasound wave incident angle (rad); f _S-ultrasonic emitting frequency (Hz); Δ f-difference on the frequency (Hz); The velocity of propagation of c-ultrasound wave in concrete.

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, transmitter module, receiver module, signal processing module, temperature compensation module, high frequency oscillation module, serial communication module, flow display module and DSP; Two tilting respectively symmetries of sound wedge are installed on the both sides of concrete conveying pipe, and ultrasonic emitting sensor and ultrasound wave receiving sensor are installed in respectively in separately the sound wedge; Transmitter module is connected with the ultrasonic emitting sensor, and receiver module is connected with the ultrasound wave receiving sensor; Signal processing module is connected with receiver module; DSP respectively with transmitter module, receiver module, signal processing module, temperature compensation module, high frequency oscillation module, serial communication module is connected with the flow display module.

The beneficial effect that the present invention has is:

By measuring the difference on the frequency between reflective sound wave and the emission sound wave, calculate concrete flowing 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, transmitter module, 7, receiver module, 8, signal processing module, 9, temperature compensation module, 10, high frequency oscillation module, 11, serial communication module, 12, flow display module, 13, DSP, 14, concrete pump.

Embodiment

As shown in Figure 1 and Figure 2, the present invention includes concrete pump 14; Also comprise ultrasonic emitting sensor 1,2, two sound wedges of ultrasound wave receiving sensor 3,4, concrete conveying pipe 5, transmitter module 6, receiver module 7, signal processing module 8, temperature compensation module 9, high frequency oscillation module 10, serial communication module 11, flow display module 12 and DSP13; Two sound wedge 3,4 tilting respectively symmetries are installed on the both sides of concrete conveying pipe 5, and ultrasonic emitting sensor 1 and ultrasound wave receiving sensor 2 are installed in respectively in separately the sound wedge 3,4; Transmitter module 6 is connected with ultrasonic emitting sensor 1, and receiver module 7 is connected with ultrasound wave receiving sensor 2; Signal processing module 8 is connected with receiver module 7; DSP13 respectively with transmitter module 6, receiver module 7, signal processing module 8, temperature compensation module 9, high frequency oscillation module 10, serial communication module 11 and flow display module 12.

As shown in Figure 3, software systems of the present invention comprise measuring system initialization module, fault diagnosis and processing module, parameter setting and modified module, signal measurement and processing module, control and serial communication module, 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 initialization, and various measurement parameters are set then.The DSP program is sent and is controlled signal to high frequency oscillation module, produces emission ultrasound wave trigger pulse, and ultrasonic transducer begins to launch ultrasound wave, system log (SYSLOG) emission frequency of ultrasonic f _sReceiver module receives and includes transmission frequency f _sWith the frequency f that has Doppler shift that is reflected _RSignal after, signal is carried out bandpass filtering and synchronous demodulation, demodulate Doppler shift f _R-f _s, signal amplified and be delivered to A/D converter carry out data acquisition, signal is transferred to DSP.Establishment DSP program is carried out error correction and data processing according to the various measurement parameters of gathering in real time, calculates real time discharge volume and integrated flux, and result of calculation is shown.

As shown in Figure 2,, ultrasonic emitting sensor 1 is f by the concrete transmission frequency of transmitter module 6 in concrete conveying pipe 5 _sUltrasound wave, be subjected to being suspended in the particle that moves with concrete in the concrete or the reflex time of bubble, the reflective sound wave that ultrasound wave receiving sensor 2 is received produces frequency displacement.If the reflective sound wave frequency that receives is f _R, the velocity of propagation of ultrasound wave in fluid is c, then f _sWith f _RRelation can be represented by the formula:

$f_R=\frac{c+\mathrm{\υ}\cos \mathrm{\θ}}{c-\mathrm{\υ}\cos \mathrm{\θ}}\·f_S---\left(1\right)$

Because the velocity of propagation c of ultrasound wave in concrete is far longer than concrete flowing velocity in conveyance conduit, therefore following formula can be written as:

$f_R=(1+\frac{2\mathrm{\υ}\cos \mathrm{\θ}}{c})\·f_S---\left(2\right)$

Be that frequency displacement Δ f is

$\mathrm{\Δf}=f_R-f_S=\frac{2\mathrm{\υ}\cos \mathrm{\θ}}{c}\·f_S---\left(3\right)$

Then can be in the hope of the flowing velocity of fluid:

$\mathrm{\υ}=\frac{c}{2\cos \mathrm{\θ}\·f_S}\·\mathrm{\Δf}---\left(4\right)$

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

$Q=\mathrm{S\υ}=\frac{\mathrm{Sc}}{2\cos \mathrm{\θ}\·f_S}\·\mathrm{\Δf}---\left(5\right)$

Device such as ultrasonic emitting sensor T/R40, ultrasound wave receiving sensor T/R40, transmitter module RBA-24, receiver module RBA-23, serial communication module ADAM-4510I, high frequency oscillation module FU-19, temperature compensation module 143-131A, signal processing module KLM-4701, flow display module LCM141 and DSP that the present invention adopts all can buy on the market.

Claims (2)

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, ultrasonic emitting sensor and ultrasound wave receiving sensor are installed in respectively in two sound wedges, the ultrasonic emitting sensor is launched the ultrasound wave of certain intensity by the concrete that transmitter module flows in concrete conveying pipe, the particle that ultrasound wave is moved with concrete reflexes to the ultrasound wave receiving sensor, produce difference on the frequency between reflective sound wave that receiver module receives by the ultrasound wave receiving sensor and the emission sound wave, this difference on the frequency is proportional to the concrete flow velocity, therefore can calculate the concrete flow velocity according to difference on the frequency, 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 its method are as follows:

1) two sound wedges is installed in respectively on the concrete conveying pipe, ultrasonic emitting sensor and ultrasound wave receiving sensor are installed in respectively in two sound wedges;

2) transmitter module is connected with the ultrasonic emitting sensor, makes the ultrasonic emitting sensor be in emission state always;

3) receiver module is connected with the ultrasound wave receiving sensor, receives the signal of ultrasound wave receiving sensor output always;

4) high frequency oscillation module is connected with DSP, produces emission ultrasound wave trigger pulse;

5) signal processing module is connected with receiver module, the reflective sound wave that receiver module receives is handled with the emission sound wave;

6) difference on the frequency between calculating reflective sound wave and the emission sound wave obtains concrete flowing 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;

$Q=\mathrm{S\υ}=\frac{\mathrm{Sc}}{2\cos \mathrm{\θ}\·f_S}\·\mathrm{\Δf}$

In the formula:

The actual flow that the Q-concrete pump is total, unit is: m ³/ s; The sectional area of S-concrete conveying pipe, unit is: m ²υ-concrete flow velocity, unit is: m/s; θ-hyperacoustic incident angle, unit is: rad; f _S-ultrasonic emitting frequency, unit is: Hz; Difference on the frequency between Δ f-reflective sound wave and the emission sound wave, unit is: Hz; The velocity of propagation of c-ultrasound wave in concrete.

2. a concrete pump real time flow measurement mechanism comprises concrete pump (14); 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), transmitter module (6), receiver module (7), signal processing module (8), temperature compensation module (9), high frequency oscillation module (10), serial communication module (11), flow display module (12) and DSP (13); The tilting respectively symmetry of two sound wedges (3,4) is installed on the both sides of concrete conveying pipe (5), and ultrasonic emitting sensor (1) and ultrasound wave receiving sensor (2) are installed in respectively in separately the sound wedge (3,4); Transmitter module (6) is connected with ultrasonic emitting sensor (1), and receiver module (7) is connected with ultrasound wave receiving sensor (2); Signal processing module (8) is connected with receiver module (7); DSP (13) respectively with transmitter module (6), receiver module (7), signal processing module (8), temperature compensation module (9), high frequency oscillation module (10), serial communication module (11) is connected with flow display module (12).

Images