CN101532894B - Intelligent portable cable tension measuring apparatus - Google Patents
Intelligent portable cable tension measuring apparatus Download PDFInfo
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- CN101532894B CN101532894B CN2009100977379A CN200910097737A CN101532894B CN 101532894 B CN101532894 B CN 101532894B CN 2009100977379 A CN2009100977379 A CN 2009100977379A CN 200910097737 A CN200910097737 A CN 200910097737A CN 101532894 B CN101532894 B CN 101532894B
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Abstract
An intelligent portable cable tension measuring apparatus comprises a hydraulic jack for generating cable tension measuring force, a bridge arm, a pressure sensor, a displacement sensor and a microprocessor for measuring cable tension according to the measuring data of the pressure sensor and the displacement sensor; the microprocessor comprises a data reading unit for reading the measuring data of the pressure sensor and the displacement sensor; a measured cable diameter evaluation unit for evaluating the diameter of the measured cable; a measured cable flexural torque evaluation unit for measuring the flexural torque F <***> (delta y) of the measured cable according to the diameter d and deflection (delta y) of the measured cable for the measured cable flexural torque curve taking diameter d and deflection (delta y) of the measured cable as variable; a cable tension measuring unit for calculating the tension according to the measuring data of the pressure sensor and the displacementsensor, length of the bridge arm, flexural torque data of the measured cable. The invention has wild measuring range, high measuring precision, convenient carrying and high intelligent degree.
Description
Technical field
The invention belongs to the application of technology aspect the cable tension measurement such as mechanics, hydraulic pressure and embedded system, specifically be applicable to the tension detecting apparatus in the space structures such as cable-stayed bridge, suspension bridge, hoister, aerial cableway, high-tension bus-bar.
Background technology
The tension force of many employing cables comes bearing load in the modern project facility, as cable-stayed bridge, suspension bridge, hoister, aerial cableway, high-tension bus-bar etc.Line structure at this type of bearing load in occupation of key position.For ensureing the security of this class formation, accurately, promptly measure the important step that cable stress becomes the job facilities later maintenance.Cable force measurement is for monitoring the stressing conditions of line structure at any time, and the technology status of evaluation structure and timely discovery potential safety hazard provide effective means.To high voltage transmission line, the measurement of cable forces such as cable-stayed bridge can detect to a certain degree whether guard system etc. intact, whether cable corrosion takes place.Therefore for guaranteeing the safety of engineering and carrying out smoothly of construction, the tension force of measuring cable is a key factor.
For structures such as suspension bridge, cable-stayed bridge, high mountain cableway, slip ropes, the force-bearing situation of cable all becomes the important step of evaluation state of living in itself during its construction and operation.Ignored this link, for example produced near the stress state of destroying and fail in time to detect, just may cause great engineering accident, made national economy suffer to lose significantly because of ageing equipment.Be to detect in real time Suo Li,, must provide effectively and easy cable tension detection method to be used for technical Analysis, to get rid of potential safety hazard, to be convenient to the construction and the maintenance of engineering.
The tension detecting method of cable mainly comprises the measuring method and computer aided measurement (ComputerAidedTesting the is called for short CAT) method of traditional mechanical formula at present.The problem that traditional analog metering system exists at aspects such as precision, reliability, dirigibilities is expected to be solved by the digital measurement method in conjunction with computing machine.
The tonometric method of cable has multiple, traditional analog measuring method and digital measurement methods such as frequency method, fluctuation method as tensimeter, pressure transducer, the around-France measurement of magnetic force at present.Industry generally believes that analog measuring method is applicable to the cable force measurement of construction stage, the digital measurement method owing to its dirigibility be suitable for finishing in the construction stage after to the maintenance of facility.
The measuring method of cable tension commonly used can roughly be divided into four kinds of methods such as pressure gauge reading method, sensor reading method, frequency method and fluctuation method in the engineering at present, and the principle summary of various measuring methods is as follows:
(1) pressure gauge reading method
The principle of this method is during according to the stretch-draw cable, and the reading of oil pressure gauge is calculated the stretching force of stretch-draw lifting jack on the oil pump, draws cable tension thus.Measure Suo Lishi with this method, will demarcate the hydraulic system of stretch-draw cable in advance, set up the corresponding relation between oil pressure gauge reading and the jack tension power.
The pressure gauge reading method is suitable for the construction stage and determines the cable force size, and construction is finished the back because installation and mobile large-tonnage stretch-draw lifting jack extremely bother and should not adopt.
(2) sensor reading method
This method is series connection one pressure transducer between the towbar of stretch-draw lifting jack and piston, and the tension force size reaches the instrument that is complementary with it by pressure transducer and measures.Utilize this method to measure Suo Li, need equally in advance sensing system to be demarcated, set up the relation between sensor reading and its pressure.If the stable performance of used sensor, the tension force of measuring cable with it is expected to obtain the precision higher than oil pressure gauge method of reading.Because during with this method, sensor will be used with lifting jack, so the same with the pressure gauge reading method cable force measurement that is applicable to the construction stage of this method, the cable force measurement after finishing for construction is also inconvenient.
(3) frequency method
Measure the tension force of cable with this method, need at first manage to measure the vibration frequency of cable, because of existing fixing relation between the vibration frequency of cable and the Suo Li.By carrying out power spectrumanalysis with the sampled data that the mode of computer aided measurement obtains, according to the fundamental frequency of the feature picked up signal of spectrogram from the vibration signal of sensor acquisition.Relation formula by fundamental frequency and cable tension calculates the Suo Li size.
According to the difference of cable vibration frequency to be measured, frequency method can be divided into resonant method and random vibration method again.When adopting resonant method to measure the cable vibration frequency, need to make it to make single fundamental vibration, measure fundamental frequency with frequency meter then with the method for artificial exciting.The shortcoming of resonant method mensuration rope vibration frequency is that the accuracy of measurement result is relevant with operator's experience, veteran tester can swash the pure fundamental vibration that rope in the short time, and common people often can not encourage pure fundamental vibration, also just can not survey the fundamental frequency of drag-line certainly.When measuring the cable vibration frequency, need not carry out artificial exciting to it, but utilize the exciting source at random under the environment such as wind, bridge floor vibration that the excitation of cable is measured with random vibration method.
At random under the excitation of vibration source, the vibration of rope is a kind of random vibration, can utilize spectrum analyzer that the random signal that obtains is carried out spectrum analysis, generally can obtain the vibration frequency on former rank at environment.The vibration frequency of utilizing the environment random vibration method to measure cable has not to be needed it is carried out artificial exciting, has the vibration frequency that records and waits advantage accurately and reliably.
(4) fluctuation method
This method is propagated the relation of velocity of wave and drag-line tension force according to stress wave in cable, measure the propagation time difference between driving pulse and the reflection wave earlier, just can calculate drag-line tension force according to formula.The fluctuation method is implemented simple, only needs the power hammer to knock, and has hit stress wave, can be analyzed by the stress wave propagation figure that measures and obtain a result.
China's utility model patent (patent No.: 200620104859.8) disclose force tester in a kind of cable wire, this dynamometry instrument comprises heavy frame and is located at rope clamping element between the heavy frame two ends, it is characterized in that: described rope clamping element links to each other with a power input shaft that can move up and down by a pulling force sensor, other is provided with a power input component, this power input component is connected with power input shaft by reducing gear, and described power input shaft also is connected with the amount of deflection sensor.By improving rope clamping force feed mechanism and surveying instrument, improved measuring accuracy, reliable operation has reached purpose laborsaving, that be convenient to operate.
China's utility model patent (patent No.: 03273775.0) disclose a kind of rope tension measurement instrument, comprise brachium pontis in this measuring instrument, point device, force-sensing sensor, rope binding clasp and display device, point device is fixed on the brachium pontis, force-sensing sensor one end is connected on the brachium pontis, the other end is connected with the rope binding clasp, display device links to each other with force-sensing sensor, the rope binding clasp comprises the matrix that is connected with force-sensing sensor, the moving pressure point device that is connected on this matrix, and be fixed in limited block on this matrix, this point device, be formed with the gap between pressure point device and the limited block.Because this rope tension measurement instrument can be to being measured by measuring rope under the situation that need not to unload, thus can tensioning by any position of measuring rope on carry out various ropes rapidly and exactly and draw force measurement, and can under the work high above the ground environment, use.
In the mechanical measuring method of cable tension, can be divided into three kinds of forms: the size of (1) fixed deformation amount, read the acting force that is applied and extrapolate cable tension; (2) the fixing amount of force that is applied reads the data of deflection and extrapolates cable tension; (3) read the size of deflection and acting force simultaneously, calculate cable tension.
But, along with the continuous overstriking of employed cable diameters on the engineering, wish to adopt the mechanical measuring method of cable tension to be greatly limited at the maintenance phase of facility, particularly the tension force to cable carries out online detection on large-scale space structure, often need to be equipped with a cover dynamic action device to produce the measurement acting force owing to need produce bigger measurement acting force to cable, this carries out the great restriction that on-line measurement is subjected to the cable tension under the work high above the ground environment such as cable-stayed bridge, suspension bridge, aerial cableway; The patent No. is that the rope binding clasp and the patent No. that are adopted in the 03273775.0 disclosed rope tension measurement instrument are that the rope clamping force feed mechanism that is adopted in the force tester in the 200620104859.8 disclosed cable wires is to realize major diameter cable measurement acting force, in addition in order to realize that the required power that screws of bigger measurement acting force also must be very big, so the power of operation handwheel just is attached on the measured cable, causing having superposeed in measuring acting force screws power, makes measuring accuracy be subjected to the influence that this screws power.
Summary of the invention
Limited for the measurement range that overcomes existing cable tension instrument, measuring accuracy is poor, be difficult under the work high above the ground environment to use, deficiency that intelligent degree is low, the invention provides that a kind of measurement range is wide, measuring accuracy is high, the high intelligent portable cable tension measuring apparatus of easy to carry, intelligent degree.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of intelligent portable cable tension measuring apparatus, comprise and be used to produce the hydraulic jack that cable tension is measured acting force, brachium pontis, pressure transducer, displacement transducer and the microprocessor that is used for carrying out the cable tension measurement according to the measurement data of pressure transducer and displacement transducer, described hydraulic jack comprises cylinder body and ergometry generation part, in the cavity volume of cylinder body one end, piston is housed, piston stretches out the outer sounding rod of cylinder body with an end fixedlys connected, described ergometry generation part comprises between sounding rod and the piston spring is housed, cylinder body has flange outward, brachium pontis, end cap is with after back-up ring is fixedlyed connected, be rotatably assorted between back-up ring and the cylinder body external cylindrical surface, displacement transducer is housed on the end cap; The cylinder body middle part is respectively equipped with the retaining valve that an end is communicated with the piston base cavity volume, the other end is communicated with small plunger bottom cavity volume, the off-load ball valve that one end is communicated with oil sac, the other end is communicated with the piston base cavity volume, and the in line check valve that an end is communicated with oil sac, the other end is communicated with small plunger bottom cavity volume; Draw a measured hole of measuring the pressure of hydraulic oil, setting pressure sensor on measured hole at the cylinder body middle part that is communicated with the piston base cavity volume; Described brachium pontis is fixedlyed connected with end cap, and the output of described pressure transducer and displacement transducer is connected with described microprocessor; Described microprocessor comprises: data-reading unit is used to read the measurement data of pressure transducer and displacement transducer;
The measured cable diameter evaluation unit is used to estimate the diameter of measured cable, measures the displacement of the piston of lifting jack according to formula (2) when condition is just reached foot and estimates:
F
*-F
**(δy)≥0 (2)
Wherein, F
*Be the acting force on the piston of lifting jack, F
*(δ y) is the effect counter-force of the compression spring of lifting jack;
Formula (2) condition is just reached when sufficient, and the sounding rod of expression lifting jack contacts with measured cable, and the displacement of sounding rod equals the diameter d of measured cable;
Measured cable moment of flexure evaluation unit, the diameter d and the deflection δ y that are used to adopt experimental method to obtain different cables are the measured cable M curve of variable, try to achieve measured cable moment of flexure F according to the diameter d and the deflection δ y of the measured cable that obtains
* *(δ y);
The cable tension measuring unit, be used for the measurement data according to pressure transducer and displacement transducer, the length of brachium pontis, the tension force of measured cable moment of flexure data computation cable: according to the acting force P at piston 19 that the area A and the pressure transducer of brachium pontis length D, deflection δ y, piston 19 measures, the cable tension computing method are represented by formula (3):
In the formula: D is a brachium pontis length, and δ y is a deflection, and A is the area of piston, and P is the pressure of hydraulic oil, F
* *(δ y) is the measured cable moment of flexure when deflection is δ y, F
*(δ y) is the power of the back-moving spring when deflection is δ y.
Further, described microprocessor also comprises: communications interface unit is used for carrying out exchanges data with other communication facilitiess; Show output unit, be used for the cable tension measurement result is presented at display unit.
As preferred another kind of scheme: described hydraulic jack also comprises body part and handle component; Described body part comprises the housing that is fixed on the cylinder body, in the cavity volume of housing one end oil sac is housed, pack in another stomidium of cylinder body, and the small plunger that can in described another stomidium, slide, the small plunger outer end is with spring on the face of cylinder, fixedly an end of the straight pin on the all-in-one-piece spring pad and front and back two connecting rods is hinged with small plunger, and the other end of front and back two connecting rods is hinged by the crank throw of front and back straight pin and handle one end respectively; Described handle component comprises two handles, the crank throw of two handle one ends respectively with two projections of the housing other end on straight pin hinged, at two handle middle parts the opposite boss of direction is arranged respectively, being equipped with on the crank throw of two handle one ends respectively can be around the banking stop of straight pin rotation.
Described handle component comprises two handles, the crank throw of two handle one ends, respectively with two projections of the housing other end on straight pin hinged; In order to prevent that in use two palmistrys are hit, at two handle middle parts the opposite boss of direction is arranged respectively, being equipped with on the crank throw of two handle one ends respectively can be around the banking stop of straight pin rotation.
The beneficial effect that the present invention has is:
1) utilizes the grip of both hands, by the small plunger to-and-fro movement, generation suction oil, hydraulic oil promotes piston motion, make sounding rod produce Displacement Measurement to cable gradually, the pressure by measuring hydraulic oil and the displacement of sounding rod realize the tonometry of cable, and leicht fallen D/A during operation can not have any additional interference power to measured cable yet;
2) have advantages such as volume is little, in light weight, easy to carry, be very suitable for using when field and high-altitude space structure are measured;
3) intelligent degree height, the measured cable range of instability that can eliminate measured cable moment of flexure and volume strand class is to tonometric influence.
Description of drawings
Fig. 1 is a structural principle synoptic diagram of the present invention;
Fig. 2 is the force analysis figure when measuring cable tension;
Fig. 3 is a kind of desirable acting force and the graph of a relation between the deflection;
Fig. 4 is the intelligent portable cable tension measuring apparatus processing flow chart;
Fig. 5 is the partial enlarged drawing of sounding rod;
Fig. 6 is a kind of measurement acting force of reality and the graph of a relation between the deflection.
Among the figure, the 1-end cap, the 2-sounding rod, the 3-flange, the 4-back-up ring, the 5-cylinder body, 6-unscrews the off-load knob, the 7-outage, the 8-oil sac, the 9-projection, the 10-banking stop, the 11-straight pin, the 12-straight pin, the 13-handle, the 14-straight pin, the 15-boss, the 16-boss, the 17-brachium pontis, 18-roundlet wheel, the 19-piston, 20-off-load ball valve, the 21-oil through, the 22-retaining valve, the 23-in line check valve, the 24-oil through, the 25-small plunger, the 26-projection, the 27-straight pin, the 28-connecting rod, the 29-spring, the 30-handle, the 31-banking stop, the 32-crank throw, the 33-housing, the 34-spring, the 35-groove, the 36-straight pin, the 37-connecting rod, the 38-crank throw, 39-cable tension measuring system, the 40-measured cable.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 6, a kind of intelligent portable cable tension measuring apparatus, comprise and be used to produce the microprocessor that cable tension is measured hydraulic jack, brachium pontis, pressure transducer, the displacement transducer of acting force and is used for carrying out according to the measurement data of pressure transducer and displacement transducer the cable tension measurement, described hydraulic jack comprises cylinder body 5, piston 19 is housed in the cavity volume of cylinder body 5 one ends, and a piston 19 and an end stretch out fixedly all-in-one-piece ergometry generation part of the outer sounding rod 2 of cylinder body; Described ergometry generation part comprises between sounding rod 2 and the piston 19 spring 34 is housed, flange 3 is arranged outside the cylinder body 5, after brachium pontis 17, end cap 1 and back-up ring 4 are fixed into one, back-up ring 4 forms with cylinder body 5 external cylindrical surfaces and is rotatably assorted, displacement transducer 35 is housed on the end cap 1, is used to measure the displacement of sounding rod 2; Cylinder body 5 middle parts have the retaining valve 22 that an end is communicated with piston 19 bottom cavity volumes, the other end is communicated with small plunger 25 bottom cavity volumes respectively, have that an end is communicated with oil sac 8, the other end and the off-load ball valve 20 that piston 19 bottom cavity volumes are communicated with, the in line check valve 23 that an end is communicated with oil sac 8, the other end is communicated with small plunger 25 bottom cavity volumes is arranged; Draw a measured hole of measuring the pressure of hydraulic oil at the cylinder body middle part that is communicated with piston 19 bottom cavity volumes, setting pressure sensor 36 is used to measure the stressed of piston 19 on measured hole; Described brachium pontis 17 is fixedlyed connected with end cap 1, and output is connected with described microprocessor by the A/D interface described pressure transducer with displacement transducer, and described microprocessor is controlled described display unit and shown;
Described microprocessor comprises:
Data-reading unit is used to read the measurement data of pressure transducer and displacement transducer;
The measured cable diameter evaluation unit is used to estimate the diameter of measured cable;
Measured cable moment of flexure evaluation unit is according to the diameter of estimation measured cable and the deflection estimation measured cable moment of flexure that described displacement sensor arrives;
The cable tension measuring unit is according to the tension force of data computation cables such as the length of the measurement data of pressure transducer and displacement transducer, brachium pontis, measured cable moment of flexure;
Communications interface unit is used for carrying out exchanges data with other communication facilitiess;
Show output unit, be used for the cable tension measurement result is presented at display unit;
Software processes flow process in the microprocessor as shown in Figure 4.
Described hydraulic jack also comprises body part and handle component, described body part comprises the housing 33 that is fixed on the cylinder body 5, in the cavity volume of housing 33 1 ends oil sac 8 is housed, pack in cylinder body 5 another stomidiums, and the small plunger 25 that can in described another stomidium, slide, small plunger 25 outer end is with spring 29 on the face of cylinder, fixedly the straight pin on the all-in-one-piece spring pad 12 is hinged with an end of front and back two connecting rods 28,27 with small plunger 25, and the other end of front and back two connecting rods 28,27 is hinged by the crank throw 32,38 of front and back straight pin and handle one end respectively.Described handle component comprises the crank throw 32,38 of 30,13, two handle one ends of two handles, respectively with two projections of housing 33 other ends 26,9 on straight pin 27,11 hinged; In order to prevent that in use two palmistrys are hit, at two handles, 30,38 middle parts the opposite boss of direction 16,15 is arranged respectively, being equipped with on the crank throw 32,38 of two handle one ends respectively can be around the banking stop 31,10 of straight pin 27,11 rotations.
The hydraulic jack course of work of the present invention can be divided into oil-absorbing process, and oil extraction and tonometry process are measured the reseting procedure after finishing, and now each process are described as follows:
Oil-absorbing process: when both hands are held handle 13 respectively, 30 and when unclamping, small plunger 25 moves right under the effect of spring 29, be contained in the oil in the oil sac 8, through in line check valve 23, hole 24 enters small plunger 25 and moves right the cavity volume that the back forms, at this moment retaining valve 22 and off-load ball valve 20 are under the effect that off-load knob 6 screws, all be in closed condition, small plunger 25 moves right simultaneously, by driving front-rear linkages 28 with the fixing straight pin 12 of small plunger 25,37 also move right, connecting rod 28,37 when moving right, respectively by straight pin 14,36 through two handles 13,30, the crank throw 32 of front end, 38 around two projections 26 that are fixed as one with housing 33, straight pin 27 on 9,11 revolutions, handle 13 at this moment, 30 open gradually.
Oil extraction and tonometry process: when both hands are held two open handles 13 respectively, 30 and when inwardly firmly moving, handle 13,30 respectively around straight pin 11,27 rotate, handle 13, the crank throw 38 of 30 front ends, 32 by straight pin 36,14 difference drivening rods 37,28 to left movement, again by with the fixing all-in-one-piece straight pin 12 of small plunger 25, drive small plunger 25 to left movement, hydraulic oil in the small plunger 25 bottom cavity volumes is discharged by retaining valve 22, enter piston 19 bottom cavity volumes, promote piston 19 and be fixed on the sounding rod 2 of one to left movement with piston 19, by the displacement of detection sounding rod 2 and the internal tension T of the measurement of the applied pressure on the piston 19 cable, in line check valve 23 and off-load ball valve 20 all are in closed condition under the effect that off-load knob 6 screws in measuring process, by carrying out oil suction repeatedly, the oil extraction process, sounding rod 2 makes cable 40 produce deformation displacement diametrically to left movement gradually, by detecting the applied pressure F on deformation displacement amount δ y and the piston 19
*Calculate the internal tension of cable, and compression spring 34 simultaneously, therefore when calculating the actual measurement directed force F, must consider the effect counter-force F of compression spring 34
*And because the resistance to bending F that cable generation deformation is produced
* *, computing formula is shown in (1):
F＝F
*-F
**(δy)-F
***(δy) (1)
In the formula: F is the actual measurement acting force, F
*Be the acting force on piston 19, F
*(δ y) is the effect counter-force of compression spring 34, F
* *(δ y) elastic reaction for being produced owing to the cable distortion.The force analysis of measured cable as shown in Figure 2.
Measure the reseting procedure after finishing: after cable tension is measured end, unscrew off-load knob 6, off-load ball valve 20 is opened, piston 19 is under the effect of the elastic force of spring 34, piston 19 is moved right, hydraulic oil in the bottom cavity volume of piston 19 enters in the oil sac 8 by hole 21, off-load ball valve 20, hole 7, and piston 19 and sounding rod 2 reset.
Described measured cable diameter evaluation unit, be used to estimate the diameter of measured cable, because the elastic reaction that the cable distortion is produced is relevant with the diameter of measured cable, therefore when measuring, need obtain the diameter of measured cable, the cable diameters evaluation method is to estimate according to formula (2) is measured piston 19 when condition is just reached foot displacement in the present invention
F
*-F
**(δy)≥0 (2)
Formula (2) condition is just reached when sufficient, and expression sounding rod 2 contacts with measured cable 40, estimates the diameter D of measured cable 40 from the displacement of sounding rod 2;
Measured cable moment of flexure evaluation unit is according to the diameter of estimation measured cable and the deflection estimation measured cable moment of flexure that described displacement sensor arrives; Just in order to try to achieve the F in the formula (1)
* *(δ y), the diameter d and the deflection δ y that adopt experimental method to obtain different cables among the present invention are the measured cable M curve of variable, as long as therefore obtained diameter d and deflection δ y just can try to achieve measured cable moment of flexure F
* *(δ y);
The cable tension measuring unit is according to the tension force of data computation cables such as the length of the measurement data of pressure transducer and displacement transducer, brachium pontis, measured cable moment of flexure; According to the acting force P at piston 19 that the area A and the pressure transducer of brachium pontis length D, deflection δ y, piston 19 measures, the cable tension computing method can be represented by formula (3),
In the formula: D is a brachium pontis length, and δ y is a deflection, and A is the area of piston, and P is the pressure of hydraulic oil, F
* *(δ y) is the measured cable moment of flexure when deflection is δ y, F
*(δ y) is the power of the back-moving spring when deflection is δ y.
Desirable tonometry is zero to begin to calculate from outer acting force, as shown in Figure 3; But in fact there is the power unstable region, as shown in Figure 6, therefore when measuring the cable tension of compiling the strand class, need getting rid of the influence of this section power unstable region, in the present invention this error is being considered measured cable moment of flexure F owing to compile the cable of strand class
* *In (δ y), therefore need each cable of compiling the strand class not had to measure its cable moment of flexure F under the tension force effect
* *(δ y) data, and these data being saved in the database of cable diameters and moment of flexure are so that utilize these data when measuring.
In order to improve measuring accuracy, among the present invention to adopting the roundlet wheel of full circle with contacting of measured cable, as shown in Figure 5, owing to considered the influence of power unstable region in measurement, the some way of contact of roundlet wheel and measured cable is to help to improve the computational accuracy of brachium pontis length D.
Claims (3)
1. intelligent portable cable tension measuring apparatus, it is characterized in that: described intelligent portable cable tension measuring apparatus comprises the hydraulic jack that is used to produce cable tension measurement acting force, brachium pontis, pressure transducer, displacement transducer and the microprocessor that is used for carrying out the cable tension measurement according to the measurement data of pressure transducer and displacement transducer, described hydraulic jack comprises cylinder body and ergometry generation part, in the cavity volume of cylinder body one end, piston is housed, piston stretches out the outer sounding rod of cylinder body with an end fixedlys connected, described ergometry generation part comprises first spring that is equipped with between sounding rod and the piston, cylinder body has flange outward, brachium pontis, end cap is with after back-up ring is fixedlyed connected, be rotatably assorted between back-up ring and the cylinder body external cylindrical surface, displacement transducer is housed on the end cap; The cylinder body middle part is respectively equipped with an end and is communicated with the piston base cavity volume, the retaining valve that the other end is communicated with small plunger bottom cavity volume, one end is communicated with oil sac, the off-load ball valve that the other end is communicated with the piston base cavity volume, and one end be communicated with oil sac, the in line check valve that the other end is communicated with small plunger bottom cavity volume, described hydraulic jack also comprises body part, described body part comprises the housing that is fixed on the cylinder body, in the cavity volume of housing one end oil sac is housed, pack in another stomidium of cylinder body, and the small plunger that can in described another stomidium, slide, the small plunger outer end is with second spring on the face of cylinder, fixedly an end of the straight pin on the all-in-one-piece spring pad and front and back two connecting rods is hinged with small plunger, and the other end of front and back two connecting rods is hinged by the crank throw of front and back straight pin and handle one end respectively; Draw a measured hole of measuring the pressure of hydraulic oil, setting pressure sensor on measured hole at the cylinder body middle part that is communicated with the piston base cavity volume; Described brachium pontis is fixedlyed connected with end cap, and the output of described pressure transducer and displacement transducer is connected with described microprocessor; Described microprocessor comprises:
Data-reading unit is used to read the measurement data of pressure transducer and displacement transducer;
The measured cable diameter evaluation unit is used to estimate the diameter of measured cable, measures the displacement of the piston of lifting jack when just reaching foot according to the first formula condition and estimates:
F
*-F
**(δy)≥0
Wherein, F
*Be the acting force on the piston of lifting jack, F
*(δ y) is the effect counter-force of first spring of lifting jack;
The first formula condition is just reached when sufficient, and the sounding rod of expression lifting jack contacts with measured cable, and the displacement of sounding rod equals the diameter d of measured cable;
Measured cable moment of flexure evaluation unit, the deflection δ y that diameter d that is used to adopt experimental method to obtain different cables and cable directly make progress is the measured cable M curve of variable, tries to achieve measured cable moment of flexure F according to the diameter d and the described deflection δ y of the measured cable that obtains
* *(δ y);
The cable tension measuring unit, be used for the measurement data according to pressure transducer and displacement transducer, the length of brachium pontis, the tension force of measured cable moment of flexure data computation cable: according to the area A of brachium pontis length D, described deflection δ y, piston (19) and the acting force P on piston (19) that pressure transducer measures, the cable tension computing method are represented by second formula:
In the formula: D is a brachium pontis length, and δ y is a deflection, and A is the area of piston, and P is the pressure of hydraulic oil, F
* *(δ y) is the measured cable moment of flexure when deflection is δ y, F
*(δ y) is the effect counter-force of first spring of lifting jack.
2. intelligent portable cable tension measuring apparatus as claimed in claim 1 is characterized in that: described microprocessor also comprises:
Communications interface unit is used for carrying out exchanges data with communication facilities;
Show output unit, be used for the cable tension measurement result is presented at display unit.
3. intelligent portable cable tension measuring apparatus as claimed in claim 1 or 2 is characterized in that: described hydraulic jack also comprises handle component;
Described handle component comprises two handles, the crank throw of two handle one ends respectively with two projections of the housing other end on straight pin hinged, at two handle middle parts the opposite boss of direction is arranged respectively, being equipped with on the crank throw of two handle one ends respectively can be around the banking stop of straight pin rotation.
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| CN101915631B (en) * | 2010-08-31 | 2011-08-31 | 中国远洋物流有限公司 | Tension monitoring device for cargo binding steel wire rope |
| JP5517994B2 (en) * | 2011-05-26 | 2014-06-11 | 三菱電機株式会社 | Tension detection mechanism |
| CN104044985A (en) * | 2013-12-30 | 2014-09-17 | 金陵科技学院 | Steel wire rope tensioning stress detection system |
| CN106500899A (en) * | 2016-10-14 | 2017-03-15 | 长飞光纤光缆股份有限公司 | A kind of sleeve pipe dynamic tension detection means and method |
| CN109406024B (en) * | 2018-09-07 | 2019-08-16 | 吴晟 | Self-balancing dynamometer and its application method |
| CN109612623A (en) * | 2018-12-17 | 2019-04-12 | 安徽省交通控股集团有限公司 | A kind of device and test method measuring external prestressing steel strand wires Suo Li |
| CN109883624B (en) * | 2019-04-11 | 2024-03-15 | 招商局重庆交通科研设计院有限公司 | Water tightness test equipment adopting cylindrical surface design |
| CN110160695A (en) * | 2019-07-04 | 2019-08-23 | 芜湖莫森泰克汽车科技股份有限公司 | A kind of automobile glass lifter wirerope Error Detection Unit |
| CN110608833A (en) * | 2019-09-12 | 2019-12-24 | 江苏方天电力技术有限公司 | System and method for measuring axial force of pull rod under thermal state condition |
| CN112304479B (en) * | 2020-10-26 | 2022-04-12 | 西安热工研究院有限公司 | In-service pull rod axial force measuring method |
-
2009
- 2009-04-16 CN CN2009100977379A patent/CN101532894B/en not_active Expired - Fee Related
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| CN101532894A (en) | 2009-09-16 |
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