Steel bridge deck top plate through type fatigue crack eddy current detector

Abstract

The utility model discloses a steel bridge deck top plate penetrating type fatigue crack eddy current detector, which comprises a shell base, a top cover, a crack positioning spray head, a connecting piece and an eddy current detection sliding table, the center of the shell base is provided with a central hole column for fixing a Hall sensor, and the peripheral area of the central hole column is used for arranging an eddy current detection coil; the top cover is arranged at the top of the shell base, the top cover and the shell base form a sealed shell, and the top cover is further provided with a fixing hole used for fixing the crack positioning spray head; one end of the connecting piece is connected with the top cover, and the other end of the connecting piece is movably connected with the eddy current detection sliding table to form a screw rod assembly, so that the sealing shell can translate on the eddy current detection sliding table along with the connecting piece. The utility model solves the technical problems that the sensor is easy to shake in the eddy current detection process of the through-type fatigue crack of the top plate of the steel bridge deck, the sensor is lack of external protection, and the crack detection positioning depends on manual work.

Description

TECHNICAL FIELD

[0001] The utility model belongs to steel bridge maintenance detection technical field, concretely relates to a kind of steel bridge deck top plate penetration type fatigue crack eddy current detection technology and device. BACKGROUND

[0002] Orthotropic steel bridge deck is widely used in long-span steel bridge due to its advantages of light weight, good mechanical properties, easy manufacturing and installation. During daily operation, steel bridge deck is prone to fatigue cracks under cyclic vehicle load. Among them, top plate penetration type fatigue crack is particularly dangerous, as rainwater can penetrate into steel box girder through top plate penetration type crack, causing secondary corrosion damage. Therefore, timely and effective non-destructive testing of top plate penetration type crack is an urgent need in steel bridge maintenance field.

[0003] Currently, due to the coverage of steel bridge deck top plate surface by pavement, top plate penetration type fatigue crack has the characteristics of strong concealment and deep burial depth. Eddy current testing technology can non-destructively test defects under non-contact conditions and effectively penetrate steel bridge pavement thickness. However, the sensor used for steel bridge deck top plate penetration type fatigue crack eddy current testing has the problems of large number, heavy weight and complex circuit. During testing, each sensor is prone to shaking, easy to wear with pavement surface, unstable circuit interface connection and other problems, which seriously interfere with eddy current testing signals and reduce the accuracy of eddy current testing. In addition, the existing steel bridge deck top plate penetration type fatigue crack eddy current testing device still relies on manual positioning of detected cracks, which has low detection efficiency and certain requirements for technical experience of testing personnel.

[0004] Therefore, there is a need for a steel bridge deck top plate penetration type fatigue crack eddy current testing device and technology to solve the above problems. SUMMARY

[0005] The utility model aims to provide a steel bridge deck top plate penetration type fatigue crack eddy current detector to solve the problems of sensor shaking, lack of external protection and manual positioning of detected cracks in the existing steel bridge deck top plate penetration type fatigue crack eddy current testing process.

[0006] Technical solution: To achieve the above-mentioned purposes, the utility model discloses the following technical scheme: a steel bridge deck top plate through type fatigue crack eddy current detector, including shell base, top cap, crack positioning shower nozzle, connecting piece and eddy current detection sliding table, the centre of shell base is equipped with the central hole column for fixing hall sensor, the peripheral area of central hole column is used for setting up eddy current detection coil, top cap is equipped in the top of shell base and is with shell base constitutes sealed shell, and top cap is equipped with fixed hole for fixing crack positioning shower nozzle, one end of connecting piece is connected with top cap, and the other end is movably connected with eddy current detection sliding table and forms screw rod assembly, so that the sealed shell can be translated with connecting piece on eddy current detection sliding table.

[0007] As preferred, the eddy current detection sliding table includes a translation frame and a screw rod provided on the translation frame, and the connecting end of the connecting piece and the eddy current detection sliding table is a ball nut end and is movably connected with the screw rod, so that the connecting piece can be translated left and right on the screw rod when the screw rod rotates.

[0008] As preferred, the connecting end of the connecting piece and the top cap is semicircular arc-shaped.

[0009] As preferred, a plurality of threaded holes are provided on the outer edge of the shell base, the top cap is provided with corresponding reserved holes, and the top cap and the shell base are fixed by screws.

[0010] As preferred, the connecting end of the connecting piece and the top cap is connected by screws.

[0011] As preferred, the top cap is respectively provided with interface holes for circuit connection of the eddy current detection coil and the hall sensor.

[0012] Beneficial effects: Compared with the prior art, the utility model discloses that the eddy current detection sensor and the coil are arranged in the hidden sealed shell, and the screw rod connection mode between the eddy current detection sliding table can effectively alleviate the problems of sensor shaking and unstable circuit interface connection during detection, can prevent the sensor from directly contacting the pavement layer, and can realize automatic marking of the fatigue crack position. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the steel bridge deck top plate through type fatigue crack eddy current detector.

[0014] Figure 2 It is a structural schematic view of the shell base.

[0015] Figure 3 It is a structural schematic view of the top cap.

[0016] Figure 4 It is a structural schematic view of the connecting piece.

[0017] Wherein, wherein, the shell base 10, the center hole column 11, the threaded hole 12, the top cover 20, the fixed hole 21, the interface hole 22, the crack positioning spray head 30, the connecting piece 40, the lead screw 50. DETAILED DESCRIPTION

[0018] The utility model is further illustrated below in combination with the drawings and specific embodiments, and it should be understood that these embodiments are only used for illustrating the utility model and not for limiting the scope of the utility model, and after reading the utility model, various equivalent modifications of the utility model by those skilled in the art all fall within the scope defined by the claims attached to the present application.

[0019] As Figure 1 The steel bridge deck top plate through type fatigue crack eddy current detector of the utility model, including shell base, top cover, crack positioning spray head, connecting piece and eddy current detection sliding table, the center of shell base is equipped with the center hole column for fixing hall sensor, the peripheral area of center hole column is used for setting eddy current detection coil;The top cover is arranged at the top of shell base and forms a sealed shell with shell base, and the top cover is also provided with a fixed hole for fixing the crack positioning spray head;One end of the connecting piece is connected with the top cover, and the other end is movably connected with the eddy current detection sliding table to form a lead screw assembly, so that the sealed shell can translate on the eddy current detection sliding table along with the connecting piece.

[0020] As a preferred, the eddy current detection sliding table includes a translation frame and a lead screw arranged on the translation frame, and the connecting end of the connecting piece and the eddy current detection sliding table is a ball nut end, and is movably connected with the lead screw, so that the connecting piece can translate left and right on the lead screw when the lead screw rotates. EMBODIMENT

[0021] As Figures 1-3 The steel bridge deck top plate through type fatigue crack eddy current detection sensor intelligent shell of the utility model, including shell base, top cover, crack positioning spray head and connecting piece, the top cover is arranged on the shell base, and the shell base and the top cover form a sealed shell. The crack positioning spray head is fixed on the fixed hole of the top cover. The bottom of the connecting piece is in a semicircular arch state (can play a buffering and stabilizing role when the eddy current detection sliding table as a whole translates or the lead screw rotates to produce vibration), and is connected with the top of the top cover, the upper part of the connecting piece is connected with the eddy current detection sliding table system, and the sliding table system drives the eddy current detection sensor to carry out automatic scanning.

[0022] As Figure 2As shown, an eddy current detection coil sensor is placed inside the shell base, and a center hole column is provided at the center of the base to place the Hall sensor; six reserved threaded holes are also provided on the shell base, four of which are evenly distributed on the outer edge of the shell base, and the other two are located on both sides of the reserved threaded holes (near the fixing holes). These six reserved threaded holes are all used to connect the shell base and the top cover.

[0023] like Figure 3 As shown, the top cover is equipped with interface holes for electrical connection to the eddy current detection coil and Hall sensor, as well as fixing holes for securing the crack locating nozzle. Four holes are reserved in the center of the top cover for screw fastening to the connector above it, while six holes corresponding to the housing base are provided around the top cover for fastening to the housing base. The crack locating nozzle is placed in the fixing hole of the crack locating nozzle on the top cover. The crack locating nozzle's switch is controlled by a detection signal. When a fatigue crack detection signal is received, the crack locating nozzle immediately sprays paint downward to mark the crack.

[0024] like Figure 4 As shown, the upper and lower ends of the connecting piece are respectively connected to the top cover and the ball nut of the screw of the eddy current detection slide. The lower end adopts a semicircular arch and is fixed to the top cover by screws, and the upper end is connected to the ball nut. When the screw rotates, it can drive the ball nut to move left and right. At the same time, the design of the arched lower end reduces the vibration effect during operation.

[0025] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A steel bridge deck top plate through-type fatigue crack eddy current detector, characterized by: It includes a shell base, a top cover, a crack locating nozzle, a connecting piece and an eddy current detection slide. The center of the shell base is provided with a central hole column for fixing the Hall sensor, and the peripheral area of ​​the central hole column is used to set the eddy current detection coil; the top cover is arranged on the top of the shell base and forms a sealed shell with the shell base, and the top cover is also provided with a fixing hole for fixing the crack locating nozzle; one end of the connecting piece is connected to the top cover, and the other end is movably connected to the eddy current detection slide to form a screw assembly, so that the sealed shell can translate on the eddy current detection slide with the connecting piece.

2. The steel bridge deck top plate through-type fatigue crack eddy current detector according to claim 1, characterized in that: The eddy current detection slide includes a translation frame and a screw rod arranged on the translation frame. The connecting end of the connecting piece and the eddy current detection slide is a ball nut end, which forms a movable connection with the screw rod. When the screw rod rotates, the connecting piece can be translated left and right on the screw rod.

3. The steel bridge deck top plate through-type fatigue crack eddy current detector according to claim 1, characterized in that: The connecting end between the connecting piece and the top cover is semicircular.

4. The steel bridge deck top plate through-type fatigue crack eddy current detector according to claim 1, characterized in that: A plurality of threaded holes are provided on the outer edge of the shell base, and the top cover is provided with corresponding reserved holes, and the top cover is fixed to the shell base by screws.

5. The steel bridge deck top plate through-type fatigue crack eddy current detector according to claim 1, characterized in that: The connecting piece is connected to the connecting end of the top cover by screws.

6. The steel bridge deck top plate through-type fatigue crack eddy current detector according to claim 1, characterized in that: The top cover is respectively pre-set with interface holes for connecting the eddy current detection coil and the Hall sensor circuit.

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