CN100449145C - Concrete pump displacement measuring method and apparatus thereof - Google Patents

Concrete pump displacement measuring method and apparatus thereof Download PDF

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Publication number
CN100449145C
CN100449145C CNB2006101550555A CN200610155055A CN100449145C CN 100449145 C CN100449145 C CN 100449145C CN B2006101550555 A CNB2006101550555 A CN B2006101550555A CN 200610155055 A CN200610155055 A CN 200610155055A CN 100449145 C CN100449145 C CN 100449145C
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China
Prior art keywords
displacement
concrete
transducer
piston
piston rod
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CN1975165A (en
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顾大强
黄前春
陈勇军
李伟
刘会勇
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The present invention discloses a method for measuring concrete pump output and its equipment. Said method includes the following steps: making one end of pressure sensor be mounted on the oil-feeding oil circuit of hydraulic oil cylinder; fixing and mounting the displacement sensor on the water tank by means of supporting frame; making one end of displacement sensor be fixed on the end surface of piston rod connection flange of concrete pump piston rod, another one ends of pressure sensor and displacement sensor are respectively connected with signal collecting card; then inputting the measurement analogue signal into computer software by means of signal collecting card; utilizing pressure sensor and displacement sensor to simultaneously measure pressure of concrete pump hydraulic oil cylinder and concrete cylinder piston stroke; utilizing pressure signal to trigger concrete pump piston displacement signal removing concrete pump piston idle stroke so as to obtain concrete pump effective displacement and can obtain the actual output of concrete pump.

Description

The System and Method of Concrete-pump Measures and device thereof
Technical field
The present invention relates to a kind of The System and Method of Concrete-pump Measures and device thereof.
Background technique
Along with the great development of all types of industries, civilian infrastructure, the concrete pump of China's domestic and imported or pump truck quantity constantly increase, and usage mode is also taking place to change.For improving efficiency of construction, avoiding construction to disturb residents, it is to carry out at mixing plant that concrete stirs, and mixing plant and job location distance are far away, and each job location is all different, and middle concrete transit link is to finish by concrete mixing and transporting car.Concrete stirring, transportation and construction party be Chang Weisan different unit also, normally measure with concrete mixer capacity or pump time, but do not carry out pumping each time in the concrete pump practical work process with full volume, there is not concrete pump displacement real-time measurement system accurately, allow the three parts be difficult to distinguish wherein fair deal, the evaluation to concrete pump or pump truck monitoring running state, construction management and construction quality, pump truck quality simultaneously lacks reliable basis.
Summary of the invention
The object of the present invention is to provide a kind of The System and Method of Concrete-pump Measures and device thereof, utilize pressure transducer and displacement transducer to measure the pressure and the concrete cylinder piston stroke of a concrete pump oil hydraulic cylinder simultaneously, utilize pressure signal to trigger concrete pump piston displacement signal, get rid of concrete pump piston idle stroke, thereby obtain the effective displacement of concrete pump, obtain the actual displacement of concrete pump.
The technical solution adopted for the present invention to solve the technical problems is:
One, a kind of The System and Method of Concrete-pump Measures
Linear according to oil hydraulic cylinder pressure and concrete cylinder pressure, trigger concrete cylinder piston displacement signal by the oil hydraulic cylinder pressure signal, the effective displacement of record concrete cylinder piston stroke realizes measuring concrete pump displacement, and the step of its concrete grammar is as follows:
1) on concrete mixer oil hydraulic cylinder oil-feed oil circuit, installs and measures the pressure transducer of usefulness;
2) the water tank location mounting bracket in the middle of oil hydraulic cylinder and concrete cylinder, fixed displacement sensor and static pulley on the support are fixed on displacement transducer on the support and move, the steel wire that is used for adjusting displacement transducer through behind the pulley in vertical plane;
3) analogue signal with pressure transducer and displacement transducer output is input in the computer acquisition software by data acquisition card, thereby the collection and the RT rael time of master cylinder pressure signal and displacement signal when realizing concrete pumping, get rid of the piston displacement idle stroke and obtain effective travel, can calculate the actual displacement of concrete pump:
Q = Σ i = 1 n 1 4 π D 1 2 S i ′ = 1 4 π D 1 2 Σ i = 1 n S i ′
In the formula: the Q-piston once pushes concrete actual volume (m 3), D 1-concrete cylinder diameter (m), S ' iEffective displacement (m) that-piston once pushes.
Two, a kind of measuring device of concrete pump displacement
Comprise pressure transducer, displacement transducer, position transducer fixed support, static pulley and data acquisition card; One end of pressure transducer is contained on the oil-feed oil circuit of oil hydraulic cylinder; Displacement transducer is installed on above the water tank with support, one end of displacement transducer is fixed on piston rod connecting flange end face with the same concrete pump piston rod of pressure transducer through displacement transducer steel wire, static pulley, another termination data acquisition card of pressure transducer and displacement transducer is input to the analogue signal of measuring in the computer software by data acquisition card;
Described displacement transducer is fixed on the support, the center of displacement transducer steel wire and piston rod center line, static pulley is in same vertical plane, and static pulley upper end displacement transducer steel wire keeps vertical with piston rod, and the displacement transducer steel wire is parallel with the piston rod center line behind static pulley.
Described displacement transducer steel wire top is fixed therein in the blind hole of piston rod connecting flange of a piston rod, connects with the piston rod connecting flange with conical head.
The beneficial effect that the present invention has is: the present invention has adopted pressure transducer to measure the pressure of master hydraulic cylinder in measuring phase, when the phenomenon that pump truck appearance sky is beaten, variation in pressure is less, can beat the measurement error that phenomenon causes by eliminating amount sky, compare with the transit mixer capacity or with the method that pump time measures with employing at ordinary times, this method of measurement specifically has the high advantage of precision.It need not be installed to pressure transducer direct measuring pressure in the concrete cylinder, and indirect utilization oil hydraulic cylinder pressure activated concrete cylinder piston displacement signal, has simple in structure, rationally distributed advantage, when measuring the concrete pump actual displacement, can also estimating to concrete pump or pump truck monitoring running state, construction management and construction quality, pump truck quality.
Description of drawings
Fig. 1 is that the concrete pump piston pushes concrete work schematic representation;
Fig. 2 concrete pump displacement measuring device schematic representation;
Fig. 3 is the pressure transducer scheme of installation;
Fig. 4 is the scheme of installation of displacement transducer;
Fig. 5 is the scheme of installation of displacement transducer fixing pin;
Fig. 6 is an oil hydraulic cylinder fuel injection pressure signal waveform schematic representation;
Fig. 7 is pressure and piston displacement curve synoptic diagram.
Among the figure: the 1-concrete cylinder; 2-pushes concrete piston; The 3-oil hydraulic cylinder; The 4-hydraulic piston; The 5-piston rod; The 6-hopper; 7-sucks flashboard; 8-discharges flashboard; 9-Y shape pipe; The 10-water tank; The 11-water-cooling tube; The 12-pressure transducer; The 13-signal acquiring system; The 14-displacement transducer; 15-displacement transducer steel wire; 16-piston rod connecting flange; The 17-static pulley; The 18-support; 19-taper fixing pin; 20-Fixation With Steel Wire hole; The 21-conical head; The 22-blind hole; The 23-fuel pressure wave; 24-master's hydraulic operated valve.
Embodiment
As Fig. 2, Fig. 3, shown in Figure 4, the present invention includes pressure transducer 12, displacement transducer 14, position transducer fixed support 18, static pulley 17 and data acquisition card 13; One end of pressure transducer 12 is contained on the oil-feed oil circuit of oil hydraulic cylinder 3; Displacement transducer 14 usefulness supports are installed on above the water tank 10,11 is water-cooling tube, one end of displacement transducer 14 is fixed on piston rod connecting flange 16 end faces with pressure transducer 12 same concrete pump piston rods 5 through displacement transducer steel wire 15, static pulley 17, another termination data acquisition card 13 of pressure transducer 12 and displacement transducer 14 is input to the analogue signal of measuring in the computer software by data acquisition card;
Described displacement transducer 14 is fixed on the support 10, the center of displacement transducer steel wire 15 and piston rod 5 center lines, static pulley 17 is in same vertical plane, and static pulley 17 upper end displacement transducer steel wires 15 keep vertical with piston rod 5, and displacement transducer steel wire 15 is parallel with piston rod 5 center lines behind static pulley 17.The vertical panel of static pulley 17 at fixed support 10 moved up and down, to regulate displacement transducer steel wire 15 and piston rod 5 axial location, make it keeping parallelism, guarantee piston in sucking concrete process, piston rod connection place flange can not bump against on the static pulley;
Described displacement transducer steel wire 15 tops are fixed therein in the blind hole 22 of piston rod connecting flange 16 of a piston rod 5, connect with piston rod connecting flange 16 with conical head 21, and 19 is the taper fixing pin, and 20 is the Fixation With Steel Wire hole.
Concrete pump working principle: under the effect of valve operating system, suction flashboard 7 opens, discharges flashboard 8 and cuts out, by moving behind the concrete piston 2 of piston rod 5 drive pushings, the concrete in the hopper 6 enter concrete cylinder 1 to hydraulic piston 4 under the effect of deadweight and suction under hydraulic pressure.The turnover of pressure oil is reverse in the hydraulic system, pushes concrete piston 2 and pushes forward, sucks flashboard 7 simultaneously and closes, discharges flashboard 8 and open, and the concrete in the concrete cylinder 1 just enters delivery pipe by Y-tube 9 under pressure and delivers to and pour into a mould the place.Owing to two concrete cylinder 1 alternate feeds and discharging, realize the discharge of continous-stable.
According to Fig. 1 as can be known, its volume of concrete of carrying in the unit time (be concrete pump theoretical discharge capacity) is by concrete cylinder internal diameter, piston stroke, and per hour reciprocal number of times decision in concrete cylinder of piston:
Piston is in the process of once propelling movement, and the theoretical volume of pump concrete discharge capacity is:
Q i ′ = A 1 S = 1 4 π D 1 2 S
Q ' in the formula i-piston once pushes concrete theoretical volume (m 3), A 1The area of concrete cylinder piston; D 1-concrete cylinder diameter (m), the S-piston stroke (m) in concrete cylinder.
According to the cubature formula that mixes pump displacement as can be known, the diameter of piston is a definite value, as long as measure the effective travel of piston pumping, its method of measurement just can realize, because the oil pressure of the oil hydraulic cylinder of concrete pump and the linear variation relation of pressure of concrete cylinder, as long as can measure the oil hydraulic cylinder oil pressure, utilize its pressure signal to trigger the piston displacement signal, the idle stroke of getting rid of piston, just can obtain effective travel, according to the thinking of this method of measurement, this measuring device comprises the pressure of measuring oil hydraulic cylinder and the displacement of concrete piston, as shown in Figure 2.
As shown in Figure 3, can fixed displacement sensor 14 and static pulley 17 on the support 18, fixed support is divided into two-part up and down, its underpart is to be fixed on the water tank 10, top fixed displacement sensor 14, displacement transducer 14 can carry out X on fixed support, Y, the adjusting of three directions of Z, vertically vertical with the steel wire that guarantees displacement transducer 14, horizontal and piston rod 5 parallel axes, displacement transducer 14, all adopt Bolt Connection between static pulley 14 and the fixed support 18, can regulate at any time according to actual conditions, the position of static pulley 17 will guarantee piston in sucking concrete process on the base plate, and piston rod connection place flange can not be received on the static pulley 17.
As shown in Figure 4, taper fixing pin 19 of processing on the blind hole 23 of the side of concrete cylinder piston rod and hydraulic cylinder piston rod connecting flange 16, the steel wire 15 of fixed displacement sensor, the conical head 21 of fixing pin is fixed in the blind hole 22 on the piston rod adpting flange, the axis height of conical head 21 is a little more than the axis height of blind hole 22, the bottom of taper fixing pin 19 is abutted against with piston rod 5, and the steel wire top of displacement transducer is connected on the fixed hole 20.
As shown in Figure 5, the GAUGE CONNECTOR on the oil-feed oil circuit of concrete mixer oil hydraulic cylinder 3 is unloaded, install and measure the pressure transducer 12 of usefulness, measure fuel pressure wave 23.
As shown in Figure 6, in oil hydraulic cylinder fuel injection pressure signal oscillogram, P MaxThe maximum value of expression pressure signal, promptly peak value represents piston the concrete compacting, begins to promote concrete and flows in cylinder body; p hForce value when expression piston promotion concrete flows, variation in pressure is basicly stable; P zThe middle pressure that expression is minimum, this is the piston setting in motion constantly, discharges the air layer in the concrete cylinder.By to the pressure waveform analysis, waveform is divided into three changes phases according to the time: discharge and vacate layer, compacted concrete (t p); Piston promotes the mobile (t of concrete r); Distributing valve commutation (t v).
By above-mentioned oil hydraulic cylinder fuel injection pressure signal wave form varies as can be known, each changes phase correspondence of pressure signal piston and is pushed concrete each process.Utilize the effective displacement of pressure signal trigger bit shifting signal recording and analyses stroke, two moment of trigger bit shifting signal are respectively pressure waveform peak value moment corresponding and distributing valve commutation moment corresponding.When pressure signal reached maximum value, concrete just was compacted in concrete cylinder and begins and pushes, when the end of piston motion to concrete cylinder, distributing valve begins commutation, the piston displacement of this process correspondence is only piston and once pushes the effective displacement of concrete reality, as shown in Figure 7, and t 1, t 2, t 3, t 4The moment of the moment of another piston compacted concrete, distributing valve commutation when the moment that the moment of compacted concrete, distributing valve commutate when representing extending stroke respectively, backward stroke of the piston.
Piston once pushes concrete effective displacement S ' iFor:
S′ i＝S-S pi
Concrete actual row output in the once propelling movement process of piston of concrete pump:
Q i = 1 4 π D 1 2 S i ′ = 1 4 π D 1 2 ( S - S Pi )
Concrete pump actual row output then:
Q = Σ i = 1 n Q i
Q = Σ i = 1 n 1 4 π D 1 2 S i ′ = 1 4 π D 1 2 Σ i = 1 n S i ′
The Q-piston once pushes concrete actual volume, S ' in the formula iEffective displacement (m) that-piston once pushes; S PiThe piston displacement of-pressure peak correspondence (m).
By test, this measuring device does not influence concrete pump and normally moves, when the phenomenon of idle stroke appears in pump truck, variation in pressure is less, can discharge idle stroke, obtain effective displacement, improved measuring accuracy, the live signal situation of pressure and displacement is monitored phenomenons such as whether plugging of pump truck, hopper be under feeding and is taken place in the time of can also be according to pumping.

Claims (4)

1, a kind of The System and Method of Concrete-pump Measures, it is characterized in that: linear according to oil hydraulic cylinder pressure and concrete cylinder pressure, trigger concrete cylinder piston displacement signal by the oil hydraulic cylinder pressure signal, the effective displacement of record concrete cylinder piston stroke, realize measuring concrete pump displacement, the step of its concrete grammar is as follows:
1) on concrete mixer oil hydraulic cylinder oil-feed oil circuit, installs and measures the pressure transducer of usefulness;
2) the water tank location mounting bracket in the middle of oil hydraulic cylinder and concrete cylinder, fixed displacement sensor and static pulley on the support are fixed on displacement transducer on the support and move, the steel wire that is used for adjusting displacement transducer through behind the pulley in vertical plane;
3) analogue signal with pressure transducer and displacement transducer output is input in the computer acquisition software by data acquisition card, thereby the collection and the RT rael time of master cylinder pressure signal and displacement signal when realizing concrete pumping, get rid of the piston displacement idle stroke and obtain effective travel, can calculate the actual displacement of concrete pump:
Q = Σ i = 1 n 1 4 π D 1 2 S i ′ = 1 4 π D 1 2 Σ i = 1 n S i ′
In the formula: the Q-piston once pushes concrete actual volume (m 3), D 1-concrete cylinder diameter (m), S ' iEffective displacement (m) that one piston once pushes.
2, a kind of measuring device of concrete pump displacement is characterized in that: comprise pressure transducer (12), displacement transducer (14), position transducer fixed support (18), static pulley (17) and data acquisition card (13); One end of pressure transducer (12) is contained on the oil-feed oil circuit of oil hydraulic cylinder (3); Displacement transducer (14) is installed on above the water tank (10) with support, one end of displacement transducer (14) is fixed on piston rod connecting flange (16) end face with the same concrete pump piston rod of pressure transducer (5) through displacement transducer steel wire (15), static pulley (17), another termination data acquisition card (13) of pressure transducer (12) and displacement transducer (14) is input to the analogue signal of measuring in the computer software by data acquisition card.
3, the measuring device of a kind of concrete pump displacement according to claim 2, it is characterized in that: described displacement transducer (14) is fixed on the support (10), the center of displacement transducer steel wire (15) and piston rod (5) center line, static pulley (17) is in same vertical plane, and static pulley (17) upper end displacement transducer steel wire (15) keeps vertical with piston rod (5), and displacement transducer steel wire (15) is parallel with piston rod (5) center line behind static pulley (17).
4, the measuring device of a kind of concrete pump displacement according to claim 2, it is characterized in that: described displacement transducer steel wire (15) top is fixed therein in the blind hole of piston rod connecting flange (16) of a piston rod (5), connects with piston rod connecting flange (16) with conical head (21).
CNB2006101550555A 2006-12-07 2006-12-07 Concrete pump displacement measuring method and apparatus thereof Expired - Fee Related CN100449145C (en)

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CN103114983A (en) * 2012-06-27 2013-05-22 中联重科股份有限公司 Pumping stroke control method for viscous material double-cylinder pump and pumping equipment for viscous material

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CN2138553Y (en) * 1992-07-15 1993-07-21 武汉市市政工程总公司科研所 Automatic adding device for concrete additive
CN1156704A (en) * 1996-02-07 1997-08-13 肖光荣 Concrete batching metering method and equipment
CN2265442Y (en) * 1996-05-03 1997-10-22 江苏省机电研究所 Electronic controller for concrete pump
CN2611631Y (en) * 2003-03-17 2004-04-14 杨志明 Fault warning controller of concrete pump
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