CN-122015654-A - Crack length measuring device

CN122015654ACN 122015654 ACN122015654 ACN 122015654ACN-122015654-A

Abstract

The invention relates to the technical field of ship overhaul and nondestructive detection, in particular to a crack length measuring device. A crack length measuring device comprises a shell, a photoelectric measuring part arranged at the bottom end of the shell, a power supply arranged in the shell, a display part used for receiving signals of the photoelectric measuring part and displaying the signals in length, a measuring wheel of the photoelectric measuring part, a light grid arranged on the side part of the measuring wheel, and a photoelectric sensor used for sensing the light grid. The photoelectric sensor only detects the number of grating grids passing through in sequence, namely the rotation angle of the measuring wheel, the distance of the measuring wheel, namely the length of the crack, can be obtained according to the diameter and the rotation angle of the measuring wheel, namely the length measurement of the irregular crack can be realized through a simple structure, and the problems that in the prior art, the measuring error of a ruler for the crack of the irregular curve is larger and the cost of high-precision electronic equipment is higher are solved.

Inventors

LI LEI
LIU FENGYOU

Assignees

沪东中华造船(集团)有限公司
上海江南长兴造船有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260128

Claims (9)

1. The crack length measuring device is characterized by comprising a shell, wherein a photoelectric measuring part is arranged at the bottom end of the shell, a power supply for supplying power to the photoelectric measuring part is arranged in the shell, a starting switch for controlling the on-off of current is arranged between the power supply and the photoelectric measuring part, a display part for receiving signals of the photoelectric measuring part and displaying the signals in length signals is also arranged on the shell, the photoelectric measuring part comprises a measuring wheel rotationally arranged on the shell, optical grids are arranged on the side part of the measuring wheel, the optical grids are uniformly distributed at intervals around the rotation axis of the measuring wheel, the photoelectric measuring part further comprises a photoelectric sensor arranged on the shell for sensing the optical grids, and a microprocessor for receiving the signals of the photoelectric sensor and converting the signals into the length signals is also arranged in the photoelectric measuring part or the display part.
2. The crack length measuring device according to claim 1, wherein the photoelectric measuring section includes a mount for being fixedly provided on a bottom end of the housing, the photoelectric sensor is fixedly provided on the mount, the mount corresponds to a side portion of the measuring wheel so that an inductive probe of the photoelectric sensor corresponds to a grating lattice of the side portion of the measuring wheel.
3. The crack length measuring device according to claim 1 or 2, wherein the housing comprises an upper housing and a lower housing which are separately arranged, the photoelectric measuring part is arranged on the lower housing, the display part is arranged on the upper housing, the upper housing and the lower housing are nested, and a locking structure for locking the upper housing and the lower housing is arranged between the upper housing and the lower housing.
4. The crack length measuring device according to claim 3, wherein the end portions of the outer shells of the upper shell and the lower shell are provided with bending portions for bending inwards to fix the other shell, the bending portions are provided with claw-type structures overhanging the bending portions, the upper ends of the claws are provided with external thread ends, the locking structures further comprise locking nuts in threaded fit with the thread portions, one ends of the locking nuts are provided with internal threads, and the other ends of the locking nuts are provided with extrusion portions protruding inwards to generate bending moments for the bending portions.
5. The crack length measuring device according to claim 4, wherein the top end of the upper shell is further provided with an upper supporting plate, the bottom end of the shell is provided with a lower supporting plate, the power supply is fixedly arranged on the upper supporting plate, the display part is arranged above the upper supporting plate, the photoelectric measuring part is arranged below the lower supporting plate, the crack length measuring device further comprises wires for power supply and signal transmission, two ends of the wires are respectively provided with clamping parts for fixing the wires on the upper supporting plate and the lower supporting plate, and wires outside the two clamping parts are respectively used for being connected with the display part, the photoelectric measuring part and the power supply.
6. The crack length measuring device according to claim 5, wherein the wire between the two clamping portions is spiral.
7. The crack length measuring device as set forth in claim 3, wherein a lower cover plate is provided at a bottom end of the lower case, the measuring wheel is provided between the lower cover plate and the lower case, and an upper cover plate is provided at a top end of the upper case.
8. The crack length measuring device according to claim 1 or 2, wherein the outer circumference of the measuring wheel is provided with anti-slip patterns, and the anti-slip patterns are uniformly arranged in an X shape.
9. The crack length measuring device as set forth in claim 1 or 2, wherein a reset button for resetting the measurement result to zero is further provided on the housing.

Description

Crack length measuring device Technical Field The invention relates to the technical field of ship overhaul and nondestructive detection, in particular to a crack length measuring device. Background In the process of ship construction, use and maintenance, the hull structure is easily cracked due to the influence of various factors such as load, corrosion and fatigue, and the length of the crack is required to be measured to evaluate the damage degree of the hull or develop some crack arrest researches in many times, and meanwhile, the timely discovery and accurate measurement of the hull crack are also very important for the safe operation of the ship. At present, the hull crack is measured by adopting traditional tools such as a ruler, a caliper and the like, but the measurement mode has a plurality of defects. On one hand, the measuring precision is greatly influenced by manual visual reading and operation methods, errors are easy to generate, particularly, the measuring difficulty is higher for irregular curve-shaped cracks, the precision is difficult to ensure, and on the other hand, the traditional measuring tool is inconvenient to carry, and the operation flexibility and the durability are still to be improved when the measuring tool is used in a wet and greasy shipyard environment. In addition, although some precise electronic measuring equipment can realize higher precision, the cost is high, the precise electronic measuring equipment is difficult to be distributed to patrol personnel in a large scale, and the precise electronic measuring equipment is easy to damage in a severe environment and has poor adaptability. Disclosure of Invention In view of the above, the invention provides a crack length measuring device for solving the problems of larger measuring error of a ruler for the crack of an irregular curve and higher cost of high-precision electronic equipment in the prior art. The crack length measuring device comprises a shell, wherein the shell is provided with a photoelectric measuring part at the bottom end of the shell, a power supply for supplying power to the photoelectric measuring part is arranged in the shell, a starting switch for controlling the on-off of current is arranged between the power supply and the photoelectric measuring part, a display part for receiving signals of the photoelectric measuring part and displaying the signals in length is also arranged on the shell, the photoelectric measuring part comprises a measuring wheel rotationally arranged on the shell, optical grids are arranged on the side part of the measuring wheel and uniformly distributed at intervals around the rotation axis of the measuring wheel, the photoelectric measuring part further comprises a photoelectric sensor arranged on the shell for sensing the optical grids, and a microprocessor for receiving the signals of the photoelectric sensor and converting the signals into the length signals is also arranged in the photoelectric measuring part or the display part. Further, the photoelectric measuring part comprises a mounting seat which is fixedly arranged on the bottom end of the shell, the photoelectric sensor is fixedly arranged on the mounting seat, and the mounting seat corresponds to the side part of the measuring wheel, so that the sensing probe of the photoelectric sensor corresponds to the grating grid of the side part of the measuring wheel. Further, the casing includes upper casing and inferior valve that the components of a whole that can function independently set up, photoelectric measurement portion sets up at the inferior valve, display portion sets up the upper casing, and upper casing and inferior valve nest are arranged, are provided with the locking structure who is used for locking it between upper casing and the inferior valve. Further, the end portion of the shell located outside the upper shell and the lower shell is provided with a bending portion for bending inwards to fix the other shell, the bending portion is provided with a claw-type structure extending in a cantilever mode, the upper end of each claw is provided with an external thread end, the locking structure further comprises a locking nut in threaded fit with the thread portion, one end of the locking nut is provided with an internal thread, and the other end of the locking nut is provided with an extrusion portion protruding inwards to generate bending moment for the bending portion. Further, the top of epitheca still is provided with the top board, and the bottom of casing is provided with the bottom board, and the power is fixed to be set up on the top board, display part sets up the top at the top of top board, and photoelectric measurement portion sets up in the below of bottom board, and this crack length measuring device still includes the wire that is used for power supply and signal transmission, and the both ends of wire are provided with the clamping part that supplies the wire to fix on top board and bott