CN100402852C - Concrete pump real-time displacement measurement method and device - Google Patents

Abstract

The invention discloses a method and a device for measuring the real-time displacement of a concrete pump. By measuring the piston displacement of the concrete cylinder and the pressure of the pumping hydraulic system, taking the piston displacement signal of the concrete cylinder as a benchmark, and according to the information that the piston displacement signal of the concrete cylinder is the same as the pressure signal of the pumping hydraulic system but the time of the characteristic point is different, the concrete cylinder The piston displacement signal is combined with the pressure signal of the pumping hydraulic system to analyze the piston displacement signal of the concrete cylinder and the pressure signal of the pumping hydraulic system to calculate the real-time pumping efficiency coefficient and measure the real-time displacement of the concrete pump. Aiming at the problem that the concrete pump outlet pressure and hydraulic system pressure change lead to different movement speeds of the piston in different strokes and strokes, the correction amount of the calculation result is proposed by using the information contained in the pressure signal of the pumping hydraulic system to exclude the rheological state of the mixture, The influence of different component ratios, changes in pump outlet pressure conditions, and changes in hydraulic driving force improves the measurement accuracy.

Description

Concrete pump real-time displacement measurement method and device

technical field

The invention relates to a flow measurement method and device, in particular to a concrete pump real-time displacement measurement method and device.

Background technique

The mixing and pumping of concrete are usually carried out in two places far apart, and the mixing, transportation and construction parties are often three different units. In the construction machinery leasing industry, the party at a disadvantage due to information asymmetry—the construction user—puts forward an urgent need for a displacement metering system (mainly the displacement metering system with the pump truck) to make up for this deficiency. There is also a demand for displacement metering systems in the monitoring of pump (truck) operation status, construction management and construction quality, and evaluation of pump truck quality. A typical example is: when pouring the foundation with cement slurry (or lime slurry) or driving piles with deep mixing method, because there is no reliable metering and recording device, it is difficult to guarantee the amount of cement poured in, and technical and human reasons often cause "tofu dregs". "Project", which caused huge losses to people's lives and properties, and also restricted the use of some complete equipment and construction techniques. Concrete displacement measurement technology has become an urgent engineering application technical problem to be solved in construction equipment. The development of vehicle-mounted displacement measurement devices, control systems, and statistical management systems has been regarded as an important issue by major domestic construction machinery manufacturers. A hallmark feature of the new generation of pump trucks.

There are few reports on direct research on concrete pump displacement metering technology at home and abroad. The metering methods and technical solutions that are being used or are being studied include:

(1) A method of displacement measurement using a displacement sensor and a switch sensor. This method uses a switch sensor to count the number of pumping strokes, and measures the displacement of the piston concrete pump (mud pump) according to the pumping efficiency set according to experience. Since the influence of "empty stroke" and outlet pressure change cannot be ruled out in the measurement method, there is a large measurement error in this method.

(2) The method of measuring the displacement by using the signal of the hydraulic system. This method uses the corresponding relationship between the pressure signal of the hydraulic system and the reciprocation of the piston cylinder to measure the displacement of the concrete pump. Although this method is simple and reliable, it still essentially measures the number of reciprocations of the hydraulically driven piston, and cannot distinguish the back pressure signal. The accuracy is very limited under complex working conditions.

(3) The metering method based on the measured suction volumetric efficiency. Calculate the average suction volume efficiency by measuring the suction volume efficiency of the concrete cylinder on site, and measure the strokes per minute of the piston of the concrete cylinder at the maximum stroke, and then measure the concrete pump displacement according to the average suction volume efficiency. The method is simple in principle and can reduce the error of the actual average displacement caused by the inaccurate displacement coefficient. However, special measuring pipelines are required, which also increases the workload of operators. Not only is it time-consuming, but frequent measurements are also unrealistic.

Contents of the invention

The object of the present invention is to provide a method and device for measuring the real-time displacement of a concrete pump. The device can calculate theoretical displacement, actual displacement, real-time pumping efficiency coefficient and average pumping efficiency coefficient.

The present invention is achieved through the following technical solutions:

1. Real-time displacement measurement method of concrete pump

By measuring the piston displacement of the concrete pump and the pressure of the pumping hydraulic system, taking the piston displacement signal of the concrete cylinder as a reference, and according to the information that the piston displacement signal of the concrete cylinder is the same as the pressure signal of the pumping hydraulic system but the time of the characteristic point is different, the concrete cylinder Combining the piston displacement signal with the pressure signal of the pumping hydraulic system, analyzing the piston displacement signal of the concrete cylinder and the pressure signal of the pumping hydraulic system, calculating the real-time pumping efficiency coefficient, and measuring the real-time displacement of the concrete pump; the specific steps of the method as follows:

1) Install a fixed bracket at the water tank, install two pull-rope linear displacement sensors on the fixed bracket, and connect the leading ends of the two displacement sensors to the connecting flanges of the piston rods of the concrete pump and the piston of the concrete cylinder respectively , to measure the piston displacement of the two concrete cylinders respectively;

2) Install a threaded connecting sleeve on the oil inlet circuit of the pumping hydraulic system, install a pressure sensor on the threaded connecting sleeve, and measure the pressure of the pumping hydraulic system;

3) Install two switch sensors on the fixed bracket to measure the start time and end time of each pumping stroke;

4) Collect the switch sensor signal, displacement sensor signal and pressure sensor signal, determine the start time and end time of each pumping stroke according to the switch sensor signal, and use the piston displacement signal as a reference to compare the piston displacement signal and the pumping hydraulic system pressure Combining the signals, using the information that the piston displacement signal has the same period as the pressure signal of the pumping hydraulic system but the time at which the characteristic points appear is different, the real-time pumping efficiency coefficient is calculated to realize the real-time displacement measurement of the concrete pump:

$\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="no"\; filenames="C20061015517100102.png,C20061015517100121.png"\; state="\{\{state\}\}">no</figure-callout></span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; D.</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}$

In the formula:

Q-total actual displacement of concrete pump (m ³ ); Q _i -actual displacement of the ith pumping stroke (m ³ ); D-diameter of concrete cylinder (m); S-theoretical length of concrete cylinder (m) ; η _i - the real-time pumping efficiency coefficient of the ith pumping stroke.

2. Concrete pump real-time displacement measurement device

Including two pull-rope linear displacement sensors, two switch sensors, hydraulic system pressure sensor, input device, output device and microprocessor; two pull-rope linear displacement sensors are installed on the fixed bracket of the piston concrete pump water tank, The leading ends of the two displacement sensors are respectively connected to the connecting flange of the piston rod of the concrete pump and the piston of the concrete cylinder through the fixed pulley; the pressure sensor of the hydraulic system is installed on the oil inlet of the pumping hydraulic system through a threaded connection sleeve; The two switch sensors for the start time and end time of each pumping stroke are installed on the fixed bracket; the five sensors are connected to the microprocessor, and the microprocessor is also respectively connected with the input device and the user for inputting the parameters required for displacement measurement. Connect to an output device that displays or prints the calculation results.

The L-shaped gasket is installed on the flange connecting the piston rod and the piston of the concrete cylinder; the other L-shaped gasket is installed on the flange connecting the other piston rod and the piston of the other concrete cylinder; two The lead-out ends of the displacement sensors are respectively fixed on the respective L-shaped gaskets, and the two displacement sensor pull ropes are respectively reversed through two fixed pulleys to ensure that the two displacement sensor pull ropes are parallel to the axes of the respective piston rods.

The beneficial effects that the present invention has are:

In view of the problem that the concrete pump outlet pressure and the hydraulic system pressure change cause the piston to move at different strokes and strokes at different speeds, further use the information contained in the pressure signal of the pumping hydraulic system to propose a correction amount for the calculation results, which is basically excluded from the measurement method. The rheological state of the mixture, the proportion of ingredients, the influence of the change of the pump outlet pressure and the change of the hydraulic driving force can improve the measurement accuracy.

Description of drawings

Fig. 1 is a general structural block diagram of the device of the present invention;

Fig. 2 is a schematic diagram of the installation structure of the device of the present invention;

Fig. 3 is a schematic diagram of installation of one of the displacement sensors;

Figure 4 is a schematic diagram of the installation of the pressure sensor;

Fig. 5 is a diagram showing the relationship between the pressure signal of the pumping hydraulic system and the displacement signal of the concrete cylinder piston;

Fig. 6 is a working flow diagram of the device of the present invention.

In the figure: 1. Rope-type linear displacement sensor, 2. Rope-type linear displacement sensor, 3. Switch sensor, 4. Switch sensor, 5. Hydraulic system pressure sensor, 6. Input device, 7. Output device, 8. Microprocessor, 9, fixed pulley, 10, fixed pulley, 11, main oil cylinder, 12, main oil cylinder, 13, concrete cylinder, 14, concrete cylinder, 15, main oil cylinder piston, 16, main oil cylinder piston, 17, piston rod , 18, piston rod, 19, L-shaped gasket, 20, L-shaped gasket, 21, flange, 22, flange, 23, concrete cylinder piston, 24, concrete cylinder piston, 25, threaded connection sleeve, 26, Fixed bracket.

Detailed ways

As shown in Fig. 1, Fig. 2, Fig. 3, the present invention comprises two drawstring type linear displacement sensors 1,2, two switch sensors 3,4, hydraulic system pressure sensor 5, input device 6, output device 7 and micro Processor 8. Two pull-rope linear displacement sensors 1, 2 are installed on the fixed bracket 26 of the piston concrete pump water tank, and the leading ends of the two displacement sensors 1, 2 are respectively connected to the concrete pump piston rods 17, 18 via fixed pulleys 9, 10 Connecting flanges 21, 22 with concrete cylinder pistons 23, 24; hydraulic system pressure sensor 5 is installed on the oil inlet oil circuit of pumping hydraulic system through threaded connection sleeve 25; used to determine the start time and end of each pumping stroke The two switch sensors 3 and 4 of the time are installed on the fixed bracket 26; 5 sensors tap the microprocessor 8, and the microprocessor 8 is also respectively connected with the input device 6 for inputting the required parameters of displacement measurement and for An output device 7 for display or printing of calculation results is connected. 11 and 12 are two main oil cylinders of the piston concrete pump respectively, 15 and 16 are the main oil cylinder pistons of the piston concrete pump respectively, and 13 and 14 are concrete cylinders respectively.

As shown in Figure 3, the described L-shaped gasket 19 is installed on the flange 21 connected between the piston rod 17 and the concrete cylinder piston 23; the other L-shaped gasket 20 is installed on the other piston rod 18 and On the flange 22 connected by another concrete cylinder piston 24; the lead-out ends of the two displacement sensors 1, 2 are respectively fixed on the respective L-shaped pads 19, 20, and the two displacement sensors are connected by two fixed pulleys 9, 10 respectively. 1,2 stay ropes carry out commutation, guarantee that two displacement sensors 1,2 stay ropes are parallel to respective piston rod 17,18 axes.

As shown in FIG. 2 , pull-rope linear displacement sensors 1 and 2 are installed on fixed brackets 26 respectively, wherein displacement sensor 1 is used to measure the displacement of concrete cylinder piston 23 , and displacement sensor 2 is used to measure the displacement of concrete cylinder piston 24 . Switch sensors 3 and 4 are installed on the fixed bracket respectively, and are used to determine the start time and end time of each pumping stroke. The hydraulic system pressure sensor 5 is installed on the oil inlet oil path of the pumping hydraulic system (as shown in FIG. 4 ) through the threaded connection sleeve 25, and is used for measuring the pressure of the hydraulic system. The input device 6 is used to input parameters required for displacement measurement such as slump, concrete cylinder diameter, length and the like. The output device 7 is used to display or print the calculation results. The microprocessor 8 is used to analyze the hydraulic system pressure signal, piston displacement signal and interrupt signal, and provide the clock required by the system, calculate the real-time displacement of the concrete pump and send the result to the output device.

Working process of the present invention is as follows:

2 and 6, after the i-th pumping stroke is started, when the concrete cylinder piston 23 or 24 leaves the switch sensor 3 or 4, the switch sensor 3 or 4 sends an interrupt signal (from high level to low level) Give microprocessor 8, microprocessor 8 determines the time that the ith pumping stroke starts according to its internal clock circuit; When concrete cylinder piston 23 or 24 arrives concrete cylinder 17 or 18 end, correspondingly, concrete cylinder Piston 24 or 23 arrives at switch sensor 4 or 3, and switch sensor 4 or 3 sends an interrupt signal (from low level to high level) to microprocessor 8, and microprocessor 8 determines the Time for the end of i pumping strokes. After the microprocessor 8 receives the interrupt signal sent by the switch sensors 3 and 4, it indicates that the i-th pumping stroke is completed, and the signals collected by the displacement sensor 1 or 2 and the hydraulic system pressure sensor 5 in the i-th pumping stroke are extracted , and analyze the concrete cylinder piston displacement signal and hydraulic system pressure signal of the i-th pumping stroke.

The relationship between the pressure signal of the pumping hydraulic system and the displacement signal of the concrete cylinder piston in the i-th pumping stroke is shown in Figure 5. Where (a) is the pressure-time diagram of the pumping hydraulic system, (b) is the concrete cylinder piston displacement-time diagram, and (c) is the switch sensor interruption signal-time diagram. Since the concrete cylinder 13 or 14 sucks the concrete mixture , cannot completely fill the entire concrete cylinder, there is a process of compacting the concrete during pumping. During the process of compacting the concrete, the pressure in the concrete cylinder 13 or 14 gradually increases, and correspondingly, the pressure of the main oil cylinder 11 or 12 that pushes the concrete cylinder piston 23 or 24 also gradually increases. When the concrete is fully compacted, the pressure in the concrete cylinder 13 or 14 maintains a stable value, and accordingly, the pressure in the main oil cylinder 11 or 12 also maintains a stable value. The microprocessor 8 analyzes the displacement signal of the concrete cylinder piston and the pressure signal of the pumping hydraulic system in the i-th pumping stroke, and when the pressure signal of the pumping hydraulic system maintains a stable value, it is determined that the corresponding time at this moment is t _1i . In the i-th pumping stroke, each moment has a displacement value corresponding to it. When the i-th pumping stroke starts, the displacement corresponding to time t _0i is S _0i ; when the i-th pumping stroke ends, the displacement corresponding to time t _2i is S _2i ; during the i-th pumping stroke, when the pressure signal remains When the value is stable, the displacement corresponding to time t _1i is S _1i . According to the previous analysis, S _2i -S _1i is the effective displacement of the i-th pumping stroke, and S _2i -S _0i is the total displacement of the i-th pumping stroke, then the real-time pumping efficiency of the i-th pumping stroke The coefficients are: ${\mathrm{\&eta;}}_i=\frac{S_{2i}-S_{1i}}{S_{2i}-S_{0i}}.$ It is known that the theoretical displacement of the i-th pumping stroke is: ${\mathrm{<figure-callout\; id="0"\; label="Q"\; filenames="C20061015517100122.png"\; state="\{\{state\}\}">Q</figure-callout>}}_0=\frac{1}{4}\mathrm{\&pi;}{\mathrm{D.}}^{2}S,$ Then the actual displacement of the i-th pumping stroke can be obtained:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; D.</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; D.</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; )</span>$

The total actual displacement can be obtained by adding up the actual displacement of each pumping stroke:

$\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="0"\; label="Q"\; filenames="C20061015517100122.png"\; state="\{\{state\}\}">Q</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; no</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; D.</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; D.</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; )</span>$

The average pumping efficiency coefficient can be obtained by adding up the pumping efficiency coefficients of each pumping stroke and dividing by the total number of pumping strokes.

The displacement sensor, switch sensor, hydraulic system pressure sensor and microprocessor adopted in the present invention can be purchased on the market.

Claims (3)

1. concrete pump real time discharging volume measuring method, it is characterized in that: by measuring concrete cylinder piston displacement and pumps hydraulic system pressure, with concrete cylinder piston displacement signal is benchmark, the information of the asynchronism(-nization) that occurs according to concrete cylinder piston displacement signal but characteristic point identical with the pumps hydraulic system pressure signal period, concrete cylinder piston displacement signal and pumps hydraulic system pressure signal are combined, concrete cylinder piston displacement signal and pumps hydraulic system pressure signal are analyzed, calculate real-time pumping efficiency coefficient, the concrete pump real time discharge volume is measured; The concrete steps of its method are as follows:

1) fixed support is installed in the water tank place, two dragline type linear displacement transducers are installed on the fixed support, the Outlet of two displacement transducers is connected on concrete pump respectively separately on the adpting flange of piston rod and concrete cylinder piston, measures two concrete cylinder piston displacements respectively;

2) cover that is threaded is installed on the pumps hydraulic system oil-feed oil circuit, pressure transducer is installed in to be threaded puts, measure the pumps hydraulic system pressure;

3) two switch sensors are installed on the fixed support, measure the elapsed time and the concluding time of each pump stroke;

4) switch sensor signal, displacement transducer signal and pressure sensor signal are gathered, determine the elapsed time and the concluding time of pump stroke separately according to the switch sensor signal, with the piston displacement signal is benchmark, piston displacement signal and pumps hydraulic system pressure signal are combined, utilize the information of the asynchronism(-nization) that piston displacement signal but characteristic point identical with the pumps hydraulic system pressure signal period occur, calculate real-time pumping efficiency coefficient, realize the measurement of concrete pump real time discharge volume:

$Q=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{Q}_i=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}\frac{1}{4}\mathrm{\&pi;}{D}^{2}S\&CenterDot;{\mathrm{\&eta;}}_i$

In the formula:

Actual displacement (the m that the Q-concrete pump is total ³); Q _iActual displacement (the m an of-Di i pump stroke ³); D-concrete cylinder diameter (m); S-concrete cylinder theoretical length (m); η _iThe real-time pumping efficiency coefficient an of-Di i pump stroke.

2. concrete pump real time discharge volume measuring device, it is characterized in that: comprise two dragline type linear displacement transducers (1,2), two switch sensors (3,4), hydraulic system pressure sensor (5), input device (6), output unit (7) and microprocessor (8); Two dragline type linear displacement transducers (1,2) are contained on the fixed support (26) of piston concrete pump water tank, and the Outlet of two displacement transducers (1,2) is connected on the adpting flange (21,22) of concrete pump piston rod (17,18) and concrete cylinder piston (23,24) through static pulley (9,10) respectively; Hydraulic system pressure sensor (5) is installed on the pumps hydraulic system oil-feed oil circuit through the cover (25) that is threaded; Be used for determining that the elapsed time of each pump stroke and two switch sensors (3,4) of concluding time are installed in fixed support (26); Five sensor tap microprocessors (8), microprocessor (8) are also respectively with the input device (6) that is used to import discharge capacity metering desired parameters be used for result of calculation is shown or the output unit (7) of printing is connected.

3. concrete pump real time discharge volume measuring device according to claim 2 is characterized in that: L type pad (19) is installed on piston rod (17) and concrete cylinder piston (23) flange connecting (21); Another sheet L type pad (20) is installed on another root piston rod (18) and another concrete cylinder piston (24) flange connecting (22); The Outlet of two displacement transducers (1,2) is separately fixed at separately on the L type pad (19,20), respectively two displacement transducers (1,2) stay cord is commutated by two static pulley (9,10), guarantee two displacement transducers (1,2) stay cord and piston rod (17,18) parallel axes separately.

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