CN211697647U - Excitation detection device for bridge cable - Google Patents

Abstract

The utility model discloses a bridge cable excitation detection device, establish including the cover and be surveyed the outer metal arm of force of pulling ring, equipartition on pulling the ring and set up the single section exciter that is used for being surveyed a excitation at the metal arm of force end of pulling ring, this single section exciter is gone up the interval and is equipped with two permanent magnets that are used for the excitation. The utility model discloses a bridge cable excitation detection device's measured piece wears to establish in pulling the ring, and the single section exciter through selecting evenly distributed on pulling the ring is gone to encircle and is embraced measured piece, adopts the magnetic pole to embrace the method and carry out abundant even excitation.

Description

Excitation detection device for bridge cable

Technical Field

The utility model relates to an excitation detection device especially relates to a bridge cable excitation detection device.

Background

The cable-stayed bridge is also called an oblique-tension bridge or a cable-stayed suspension bridge, is a stress system bridge with a main beam pulled on a bridge tower by a stay cable, is a new bridge type in recent decades, and has excellent economic performance and earthquake resistance.

The stay cable is a key force transmission component of the cable-stayed bridge, the design life of the stay cable is generally 25-30 years, however, the cable is replaced in advance due to the corrosion damage of the stay cable of the existing multi-seat cable-stayed bridge. For example, the American P-K bridge is a modern cable-stayed bridge, the service life of the bridge is originally estimated to be 25 years, and the cable is completely replaced after only 5 years; the Chinese Jinan yellow river highway bridge is used for 13 years, and the sea seal bridge in Guangzhou city is used for 6.5 years to change the cable. According to the statistics of changed bridge beams in China, the actual service life of the stay cable of the cable-stayed bridge is less than 15 years on average, wherein the stay cable of the Guangdong Qiu bridge is changed after being used for 6 years from 2001-2007, and the service life of the stay cable is far from the design service life. The offset cable replacement is considered to be one of the most important and effective measures for prolonging the service life of the in-service cable-stayed bridge. However, the cost of the bridge cable is only 10% of that of the full bridge when the bridge cable is newly built, the cost of replacing the cable of the cable-stayed bridge for one time can be 4-10 times of that of the newly built cable, the economy of the cable-stayed bridge is greatly reduced, and meanwhile, the inconvenience in traffic is brought when the cable is replaced.

The defects of the stay cable of the cable-stayed bridge are mainly represented by internal broken wires, sheath cracking, stay cable loosening and the like. The corrosion is a main cause of the damage of the guy cable, and can cause phenomena such as wire breakage, rust breakage and the like of the steel wire. When the steel wire inside the bridge inhaul cable is corroded to a certain degree, the potential safety hazard exists and the inhaul cable needs to be replaced in time. The instructional documents for the cable-stayed bridge cable replacement problem are few, and the current situation of 'light maintenance reconstruction' exists, wherein the 5.9.15 article of the industrial standard of the ministry of construction, namely urban bridge maintenance technical specification (CJJ99-2009), specifies the quantitative index of cable replacement, namely, the cable replacement is required when the area of a broken steel wire in one cable exceeds 2% of the total area of the steel wires of the cable, or the total area loss of the steel wires of the cable exceeds 10% due to corrosion of the steel wires. Therefore, an effective detection device is needed to measure the internal rusty fracture condition of the stay cable, and a sufficient cable replacement basis and a reasonable cable replacement time are provided, so that the economic performance of the cable-stayed bridge is improved.

At present, the detection of the stay cable of the cable-stayed bridge is mainly based on cable force measurement and appearance inspection, and mainly takes a manual measurement method as a main measurement method. The method is high in danger and damages the stay rope due to the weight of the manual work in the measuring process. With the development of nondestructive testing techniques in recent years, testing means such as a magnetic flux leakage method, a radiation method, an ultrasonic method, a magnetic extensional sensing technique, an electric reflection technique, a magnetoelastic sensor technique, a pulse eddy current technique, a nonlinear acoustic vibration technique, and an energy-gathering ground penetrating radar technique have been proposed. The magnetic flux leakage method can determine the corrosion area of the stay cable body and the internal broken wire condition, and is a common method for detecting the bridge stay cable.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a bridge cable excitation detection device who is fit for the bridge cable broken string of different diameter cables, the different diameters of same cable and different shapes.

The technical scheme is as follows: for the purpose of the realization, the utility model discloses a bridge cable excitation detection device, establish including the cover and be used for the single section exciter of being surveyed a excitation for the metal arm of force end is used for by the single section exciter of survey, this single section exciter is gone up the interval and is equipped with two permanent magnets that are used for the excitation by the metal arm of force of drawing ring, equipartition on drawing the ring outside being surveyed.

The metal force arm comprises a first force arm and a second force arm which are sequentially connected, a first stepping motor used for changing the angle of the single-section exciter is fixed at the end part of the first force arm connected with the single-section exciter, a first gear is arranged on an output shaft of the first stepping motor, and a first inner gear ring meshed with the first gear is arranged at the end part of the single-section exciter; a second stepping motor used for changing the height of the single-section exciter is fixed at the end part of a second force arm connected with the first force arm, a second gear is arranged on an output shaft of the second stepping motor, and a second inner gear ring meshed with the second gear is arranged at the lower end part of the first force arm.

Preferably, first distance measuring modules for measuring the distance between the upper end and the lower end of the single-section exciter and the surface of a measured piece are distributed above and below the single-section exciter, and second distance measuring modules for measuring the distance between the adjacent single-section exciters are distributed on the left and right of the single-section exciter.

And moreover, a Hall element for detecting a leakage magnetic signal of the tested piece and a signal conditioning circuit for processing the leakage magnetic signal are arranged between the two permanent magnets.

Further, the signal conditioning circuit comprises an amplifying circuit and a filtering circuit.

Preferably, the permanent magnet is fixed to the single-stage exciter through a magnet cover.

Furthermore, pull the ring and be connected through fixing bolt by 2 semicircle rings and form, the equipartition has a plurality of connecting hole on should pulling the ring, and the metal arm of force passes through bolted connection on the connecting hole of pulling the ring.

Further, the first distance measuring module is a VL53L0X type laser distance measuring sensor.

Preferably, the second distance measuring module is a VL53L0X type laser distance measuring sensor.

Furthermore, the hall element is model number SS 495A.

Has the advantages that: compared with the prior art, the utility model has the advantages of it is following: firstly, the measured piece of the bridge cable excitation detection device of the utility model is arranged in the traction ring in a penetrating way, the measured piece is removed from the traction ring by selecting the uniformly distributed single-section exciters, and the magnetic pole encircling method is adopted to carry out sufficient and uniform excitation, so that the distance between the adjacent single-section exciters is as small as possible and the excitation is sufficient; secondly the utility model discloses in adjust first step motor through motor drive module and can change the single section exciter angle, adjust the height that second step motor can change the single section exciter for the single section exciter can change according to the shape and the size of being surveyed the piece, reaches the effect of abundant excitation, and avoids a plurality of single section exciters to probably overlap the condition of collision at the excitation in-process.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a single-section exciter according to the present invention;

FIG. 3 is a schematic view of the self-adjustment of the present invention when a bridge bulges;

fig. 4 is a schematic diagram illustrating excitation detection of angle steel according to the present invention;

fig. 5 is a schematic view of a transmission structure of a second stepping motor according to the present invention;

fig. 6 is a circuit diagram of the amplifying circuit of the present invention;

fig. 7 is a circuit diagram of the ground wire interface of the present invention;

fig. 8 is a circuit diagram of a hall element according to the present invention;

fig. 9 is a circuit diagram of the filter circuit of the present invention;

fig. 10 is a circuit diagram of a power supply interface circuit according to the present invention;

fig. 11 is a circuit diagram of the operation of the indicator light of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

The utility model relates to a bridge cable excitation detection device, including pulling ring 1, the metal arm of force and single section exciter 2, wherein pull 1 cover of ring and establish outside being surveyed the piece, being surveyed the piece and can be cable 16, angle steel 17 or other shape steel, metal arm of force equipartition is on pulling the ring, the single section exciter is used for being surveyed a excitation, this single section exciter sets up the end at the metal arm of force, the interval is equipped with two permanent magnets that are used for the excitation on the single section exciter 2, the permanent magnet is fixed in on the single section exciter 2 through magnet cover 12.

The traction ring 1 is formed by connecting 2 semicircular rings through a fixing bolt 13, a plurality of connecting holes 14 are uniformly distributed on the traction ring 1, and a metal force arm is connected to the connecting holes of the traction ring through a bolt.

The metal force arm comprises a first force arm 3 and a second force arm 4 which are sequentially connected, a first stepping motor 5 for changing the angle of the single-section exciter is fixed at the end part of the first force arm connected with the single-section exciter, a first gear is arranged on an output shaft of the first stepping motor, and a first inner gear ring meshed with the first gear is arranged at the end part of the single-section exciter; a second stepping motor 6 for changing the height of the single-section exciter is fixed at the end part of a second force arm connected with the first force arm, a second gear 7 is arranged on an output shaft of the second stepping motor, and a second inner gear ring 8 meshed with the second gear is arranged at the lower end part of the first force arm.

First distance measuring modules 9 used for measuring the distance between the upper end and the lower end of the single-section exciter and the surface of a measured part are distributed above and below the single-section exciter 2, and second distance measuring modules 10 used for measuring the distance between the adjacent single-section exciters are distributed on the left and right of the single-section exciter. Two be equipped with the hall element 11 that is used for detecting the magnetic leakage signal of the piece under test between the permanent magnet and be used for handling the signal conditioning circuit of magnetic leakage signal, signal conditioning circuit includes amplifier circuit and filter circuit, and wherein amplifier circuit's amplifier model is LM358, and the circuit diagram is shown in figure 6, and wherein the magnification: Auf-R2F/R21, R22 is balance resistance, R22-R1/R2F; the model of the filter circuit is UAF42AP, and the circuit diagram is shown in FIG. 9. The first distance measuring module 9 is a VL53L0X type laser distance measuring sensor, the second distance measuring module 10 is a VL53L0X type laser distance measuring sensor, and the hall element 11 is SS495A in model number. FIG. 7 is a ground line interface circuit diagram connected to the amplifier circuit, the filter circuit, the pilot lamp operating circuit, the power supply interface circuit, and GND in the Hall element, so that all circuits are grounded; FIG. 10 is a circuit diagram of a power interface circuit that provides positive and negative voltages VDD and VEE to power a filter circuit and an indicator light operating circuit; the VDD is converted into VCC through the voltage reduction module LM 2596; fig. 11 is a circuit diagram of the operation of the indicator light, the operating circuit of the indicator light is connected with the power supply interface circuit, whether the power supply of the circuit board is normal or not is detected, and the two light emitting diodes which are normally powered are lighted.

The utility model discloses be connected with motor drive module on the well motor, this motor drive module's model is L298N, and a four-phase five-wire step motor 28BYJ-48 can be controlled to an L298N, and the step-by-step angle of step motor is 5.625 degrees.

Take a metal arm plus a single section exciter as an example: when the distance d measured by the first distance measuring module of the single-section exciter belongs to a normal range, the motor driving module does not give a signal to the first stepping motor driving module, and when the distance d1 measured by the first distance measuring module positioned above the single-section exciter is larger than the normal range or the distance d2 measured by the first distance measuring module positioned below the single-section exciter is smaller than the normal range, the motor driving module gives a pulse period signal to the first stepping motor, so that the first motor steps counterclockwise by a stepping angle for measuring again; and conversely, when the distance d1 measured by the first distance measuring module positioned above the single-section exciter is smaller than the normal range or the distance d2 measured by the first distance measuring module positioned below the single-section exciter is larger than the normal range, the motor driving module gives a pulse periodic signal to the first stepping motor, so that the first stepping motor steps clockwise by a stepping angle and measures again until the distances measured by the upper and lower first distance measuring modules are within the normal range.

When the distance y of the adjacent single-section exciter measured by the second distance measuring module of the single-section exciter belongs to a normal range, the motor driving module does not give a signal to the second stepping motor driving module; when the distance y measured by the second distance measuring module of the single-section exciter is close to 0, the motor driving module gives a plurality of pulse periodic signals to the second stepping motor, so that the second stepping motor steps clockwise until the single-section exciter is completely lifted. A second stepper motor stepping counterclockwise may lower a single section exciter.

The utility model discloses bridge cable excitation detection device selects to pull behind the single section exciter of suitable position, suitable figure on the ring, will descend single section exciter through the second step motor on the metal arm of force, and a plurality of single section exciters may overlap the collision at the decline in-process.

If the number of the descending single-section exciters is 3, the descending single-section exciters are numbered from left to right as a, b and c respectively, and the number of holes in the traction ring between the adjacent single-section exciters is m. In the descending process, when the distance between the single-section exciter a and the single-section exciter b is reduced and is about to collide by the second distance measuring modules of the single-section exciter a and the single-section exciter b, the second stepping motor on the metal force arm corresponding to the single-section exciter a works to lift the single-section exciter a, and the single-section exciter b and the single-section exciter c continue to fall. If the single-section exciter b and the single-section exciter c do not collide until the single-section exciter b and the single-section exciter c fall on the cable surface, after the excitation detection of the single-section exciter b and the single-section exciter c is finished, the second stepping motor on the metal force arm corresponding to the single-section exciter a works, and the single-section exciter a falls to be attached to the cable surface for excitation. Namely, carrying out excitation twice; if the single-section exciter b and the single-section exciter c collide in the process of continuously falling to the cable surface, the second stepping motor on the metal force arm corresponding to the single-section exciter b works to lift the single-section exciter b, the single-section exciter c continuously falls to carry out excitation detection, and then the single-section exciter b and the single-section exciter a fall in sequence to carry out excitation detection, namely 3 times of excitation detection is carried out.

In the calculation process, the number of the required single-section exciters is calculated and may not be an integer, and the number is taken as an integer after decimal points are omitted; although gaps exist between adjacent single-section exciters when the single-section exciters are attached to the cable surface, the occurrence of collision in the descending process is reduced, the excitation is carried out once, and the gap distance is within an error allowable range through sharing of a plurality of exciters.

The corrosion condition of the stay cable is various, and the cable head bulge is one of the corrosion conditions. In the detection process that upwards pulls, in the face of swell 15, the utility model discloses the numerical value that first distance measuring module returned on the accessible single-section exciter adjusts the metal arm of force and the continuous first step motor of single-section exciter, changes the angle of single-section exciter, keeps single-section exciter and the parallel laminating of cable face.

In the case of the stay cable with the same stay cable with the diameter changing from top to bottom, the number of the single-section exciters is n and the distance between the adjacent exciters is ensured to be the boundary distance capable of being excited fully at the beginning of measurement. When the guy cable is changed from thin to thick, the distance between the adjacent single-section exciters is uniformly increased in the ascending process of the device. And measuring the data result by a second distance measuring module of the single-section exciter, and calculating the sum of the distances between all adjacent single-section exciters. And when the value is larger than the width of one single-section exciter, the device stops moving upwards, the second stepping motor is operated, the single-section exciters attached to the guy cable surface are all lifted, and the n +1 uniformly distributed single-section exciters are selected on the traction ring again and are driven by the corresponding stepping motor to encircle the surface of the attached guy cable again. When the stay cable is thick to thin, the distance between the adjacent single-section exciters is uniformly reduced in the ascending process of the device, when the distance between the adjacent single-section exciters is smaller than 5mm, the device stops running upwards, the single-section exciters attached to the stay cable surface are all lifted up, and the single-section exciters which are uniformly distributed and n-1 in number are selected on the traction ring again to be driven by the corresponding stepping motor to be attached to the surface of the stay cable again in an encircling mode, so that full excitation and weak excitation signal detection are facilitated.

For an irregularly shaped steel cable, individual exciters at different locations on the traction ring can be selected to engage each side of the steel cable. Although the angle of the single-section exciter connected by the metal force arm is fixed and can not be changed, the single-section exciter can be distributed on the traction ring sufficiently, so that the cable surfaces of the steel cables at different angles have corresponding single-section exciters.

The utility model discloses a bridge cable excitation detection device's measured piece is mainly for striding the cable-stay bridge's cable greatly, and this cable is the major diameter cable, and the diameter is the same from top to bottom, and the cable is worn to establish in pulling the ring, goes to encircle through the single section exciter of selecting evenly distributed on pulling the ring and embraces the cable, adopts the magnetic pole to encircle the method and carries out abundant even excitation, makes the distance between the adjacent single section exciter be convenient for the excitation as far as possible abundant. The circumference of the stay cable and the width of the single-section exciter are measured, the number of the single-section exciters required when surrounding uniform circumferential excitation is carried out can be calculated, and the number of the connecting holes of the adjacent single-section exciters on the traction ring can be obtained when the selected single-section exciter is compactly arranged on the cable surface.

Claims (10)

1. The utility model provides a bridge cable excitation detection device which characterized in that: the device comprises a traction circular ring (1) sleeved outside a tested piece, a metal force arm evenly distributed on the traction circular ring and a single-section exciter (2) arranged at the tail end of the metal force arm and used for exciting the tested piece, wherein two permanent magnets used for excitation are arranged on the single-section exciter (2) at intervals.

2. The excitation detecting device for a bridge cable according to claim 1, wherein: the metal force arm comprises a first force arm (3) and a second force arm (4) which are sequentially connected, a first stepping motor (5) for changing the angle of the single-section exciter is fixed at the end part of the first force arm connected with the single-section exciter, a first gear is arranged on an output shaft of the first stepping motor, and a first inner gear ring meshed with the first gear is arranged at the end part of the single-section exciter; a second stepping motor (6) for changing the height of the single-section exciter is fixed at the end part of a second force arm connected with the first force arm, a second gear (7) is arranged on an output shaft of the second stepping motor, and a second inner gear ring (8) meshed with the second gear is arranged at the lower end part of the first force arm.

3. The excitation detecting device for a bridge cable according to claim 1, wherein: first distance measuring modules (9) used for measuring distances between the upper end and the lower end of the single-section exciter and the surface of a measured part are distributed above and below the single-section exciter (2), and second distance measuring modules (10) used for measuring distances between adjacent single-section exciters are distributed on the left and right of the single-section exciter.

4. The excitation detecting device for a bridge cable according to claim 3, wherein: the first distance measuring module (9) is a VL53L0X type laser distance measuring sensor.

5. The excitation detecting device for a bridge cable according to claim 3, wherein: the second distance measuring module (10) is a VL53L0X type laser distance measuring sensor.

6. The excitation detecting device for a bridge cable according to claim 1, wherein: and a Hall element (11) for detecting a leakage magnetic signal of the tested piece and a signal conditioning circuit for processing the leakage magnetic signal are arranged between the two permanent magnets.

7. The excitation detecting device for a bridge cable according to claim 6, wherein: the Hall element (11) is SS 495A.

8. The excitation detecting device for a bridge cable according to claim 6, wherein: the signal conditioning circuit comprises an amplifying circuit and a filtering circuit.

9. The excitation detecting device for a bridge cable according to claim 1, wherein: the permanent magnet is fixed on the single-section exciter (2) through a magnet cover (12).

10. The excitation detecting device for a bridge cable according to claim 1, wherein: traction ring (1) is formed by 2 semicircle rings connected through fixing bolt (13), and the equipartition has a plurality of connecting hole (14) on this traction ring (1), and the metal arm of force passes through bolted connection on traction ring's connecting hole.

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