JP3137470U - Crack inspection equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crack inspection apparatus capable of reducing costs for manufacturing, maintaining an apparatus, etc., and preventing a decrease in inspection efficiency even when there are a plurality of inspected objects.
A liquid supply unit 1 discharges a liquid having a temperature difference from an inspection object 5 so as to continuously contact the inspection object 5 toward the inspection object 5. The liquid supply unit 1 includes a discharge member 6 that discharges liquid and a guide member 7 that is provided apart from the discharge member 6 and guides the liquid from the discharge member 6 to the inspection object 5. The AE sensor 2 detects heat AE from the inspection object 5 and is provided on the discharge member 6. Based on the detection heat AE detected by the AE sensor 2, the crack expansion progress detection means 3 detects whether or not the crack of the inspection object 5 is expanded due to contraction or expansion due to heat. Thereby, the to-be-inspected object 5 can be distinguished into a thing with a crack and a thing without a crack.
[Selection] Figure 1

Description

  This invention relates to a crack inspection apparatus used for inspecting the presence or absence of a progressive crack in an inspection object. In particular, the present invention relates to an apparatus that uses an AE (acoustic emission) sensor when inspecting a crack of an inspection object.

Conventionally, an X-ray flaw detector, an ultrasonic flaw detector, or the like has been used to inspect a defect of an inspection object. Also, a tank inspection device as disclosed in Patent Document 1 below has been proposed. This tank inspection device detects a Lamb wave which is one of various modes of an AE wave. AE sensors that detect Lamb waves are attached to a plurality of locations in the tank.
JP 2005-017089 A

  However, the above-described X-ray flaw detection apparatus and ultrasonic flaw detection apparatus are expensive in terms of production and maintenance of the apparatus. Moreover, in the invention described in Patent Document 1, the AE sensor is attached to the tank itself which is an object to be inspected. For this reason, when there are a plurality of objects to be inspected, there is a possibility that it is necessary to replace the AE sensor from the object to be inspected after the inspection to the next object to be inspected.

  The problem to be solved by the present invention is to reduce the cost for manufacturing and maintenance of the apparatus, and to prevent a decrease in inspection efficiency even when there are a plurality of inspected objects.

  This invention is made in order to solve the said subject, and the invention of Claim 1 discharges | emits so that the liquid which has a temperature difference with a to-be-inspected object may be continuously applied toward the to-be-inspected object. Based on the liquid supply unit, the AE sensor provided on the outer surface of the liquid supply unit, and the heat AE detected by the AE sensor, it is detected whether or not the crack of the inspection object is expanded due to contraction or expansion due to heat. It is a crack inspection apparatus provided with the crack expansion progress detection means to do.

  According to the first aspect of the present invention, the heat AE propagating in the liquid can be detected by the AE sensor provided on the outer surface of the liquid supply unit. And based on the heat | fever AE detected by the AE sensor, the presence or absence of the crack of a to-be-inspected object can be detected.

  According to a second aspect of the present invention, the liquid supply unit includes: a discharge member that discharges a liquid; and a guide member that is provided apart from the discharge member and guides the liquid from the discharge member to the inspection object. The crack inspection apparatus according to claim 1, wherein the AE sensor is provided on the guide member.

  For example, the discharge member is provided with a water supply pump or the like, but according to the device according to claim 2, since the guide member provided with the AE sensor and the discharge member are separated from each other, noise from the water supply pump or the like is generated. Reaching the AE sensor can be suppressed.

  Further, the invention according to claim 3 is characterized in that the AE sensor is provided on an outer surface corresponding to a surface that is always in contact with the liquid in the liquid supply unit. This is a crack inspection apparatus.

  According to the third aspect of the invention, the heat AE propagating in the liquid can be reliably detected by the AE sensor.

  According to this device, it is possible to reduce costs for manufacturing and maintaining the apparatus, and it is possible to prevent a decrease in inspection efficiency even when there are a plurality of objects to be inspected.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. Here, although the case where this invention is applied with respect to the test object on a manufacturing line is demonstrated, it is not necessarily limited to this. Inspected objects include those that may crack, such as metal, plastic, glass, and ceramic.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a crack inspection apparatus of the present invention, which is partially shown in cross section. FIG. 2 is a schematic perspective view showing a usage state of the crack inspection apparatus of FIG. 1, and a part thereof is omitted. The crack inspection apparatus of the present embodiment includes an aluminum liquid supply unit 1, an AE sensor 2 provided in the liquid supply unit 1, and crack expansion progress detection means 3 connected to the AE sensor 2. In this embodiment, a plurality of inspected objects 5, 5,... Flowing on the conveyor 4 are inspected in order at an arbitrary location on the production line.

  The liquid supply unit 1 according to the present embodiment includes a cylindrical discharge member 6 having both ends opened, and a guide member 7 provided to be separated from the discharge member 6. In the illustrated example, the discharge member 6 is disposed to be inclined downward as it goes to the tip. A water supply tank (not shown) is connected to the opening of the base end portion of the discharge member 6 via a water supply passage 8, and a water supply pump (not shown) is provided in the middle of the water supply passage 8. On the other hand, the guide member 7 has a substantially semi-elliptical shape whose longitudinal section has a major axis larger than the inner diameter of the discharge member 6, and is disposed below the discharge member 6. The guide member 7 is arranged such that the proximal end portion is disposed slightly closer to the proximal end side than the distal end opening of the discharge member 6 and is inclined downward toward the distal end portion. Therefore, by operating the water supply pump, the water from the water supply tank is supplied to the discharge member 6 through the water supply path 8 and is guided to each inspection object 5 below it by the guide member 7. In this embodiment, the liquid discharged to each inspection object 5 is water. However, the liquid is not limited to this, and may be oil or ethylene glycol.

  The AE sensor 2 can convert the reached thermal AE into an electrical signal. One AE sensor 2 is provided on the ejection member 6, and preferably, one AE sensor 2 is provided on the outer surface of the lower end of the ejection member 6. That is, it is provided on the outer surface of the discharge member 6 corresponding to the surface that is always in contact with the liquid. One AE sensor 2 may be provided on the guide member 7, or one AE sensor 2 may be provided on both the discharge member 6 and the guide member 7. Even when the guide member 7 is provided, the guide member 7 is preferably provided at the lower end side.

  The crack expansion progress detecting means 3 is configured by connecting an amplifying means 9, a discriminating means 10, and a discriminating means 11 in order from the side closer to the AE sensor 2. The amplifying means 9 is a means for amplifying the electric signal from the AE sensor 2, and the discriminating means 10 is a means for discriminating unnecessary noise from the amplified signal. The discriminating means 11 is means for discriminating the presence or absence of cracks in each inspection object 5 based on the signals processed by the amplifying means 9 and the discriminating means 10.

  Each inspection object 5 is heated in advance by a heating means using a heat gun, electromagnetic induction, Peltier effect, or the like, and a temperature difference occurs between water, which is a propagation medium of heat AE, and each inspection object 5. In this embodiment, the heating time of each inspection object 5 by a heat gun or the like is about 10 seconds. Moreover, it is also possible to obtain a temperature difference by discharging high-temperature hot water from the liquid supply unit 1 and setting each inspection object 5 on the conveyor 4 to a temperature lower than the hot water discharged.

  By constituting in this way, the water continuously discharged from the discharge member 6 is once received by the guide member 7 and then flows so as to hit each inspection object 5. At this time, each inspection object 5 contracts or expands due to a temperature difference between the discharged water and each inspection object 5. When each inspection object 5 has a crack, the crack progresses due to the above-described temperature difference and generates heat AE. The heat AE from each inspection object 5 propagates in the water flowing from the upper discharge member 6 toward each lower inspection object 5 in the opposite direction to reach the AE sensor 2. And the presence or absence of the crack of each to-be-inspected object 5 is detectable by processing appropriately the heat | fever AE converted into the electrical signal with the AE sensor 2 with the crack expansion progress detection means 3. FIG. Thereby, each to-be-inspected object 5 which flows on the conveyor 4 can be distinguished into a thing with a crack and a thing without a crack.

  The crack inspection apparatus of the present invention is not limited to the configuration of the above embodiment, and can be changed as appropriate. For example, in the said Example, although each to-be-inspected object 5 on the conveyor 4 was test | inspected in order, you may make it test | inspect arbitrary each to-be-inspected object 5. FIG. In the above embodiment, the number of AE sensors 2 provided on the discharge member 6 and the guide member 7 is one, but the present invention is not limited to this, and a plurality of AE sensors 2 may be provided. By the way, in the said Example, it was set as the structure by which the water from the discharge member 6 is guided to each to-be-inspected object 5 with the guide member 7, However, By eliminating the guide member 7, the water from the discharge member 6 is direct. It is good also as a structure which hits each to-be-inspected object 5.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows one Example of the crack inspection apparatus of this invention, and has shown it by making one part into a cross section. It is a schematic perspective view which shows the use condition of the crack inspection apparatus of FIG. 1, and one part is abbreviate | omitted and shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid supply part 2 AE sensor 3 Crack expansion progress detection means 5 Inspected object 6 Discharge member 7 Guide member

Claims (3)

A liquid supply unit that discharges a liquid having a temperature difference from the object to be inspected continuously toward the object to be inspected;
An AE sensor provided on the outer surface of the liquid supply unit;
And a crack expansion progress detecting means for detecting whether or not the crack of the object to be inspected is expanded due to contraction or expansion due to heat based on the detected heat AE by the AE sensor. The liquid supply unit includes a discharge member that discharges liquid, and a guide member that is provided separately from the discharge member and guides the liquid from the discharge member to the inspection object.
The crack inspection apparatus according to claim 1, wherein the AE sensor is provided on the guide member. The crack inspection apparatus according to claim 1, wherein the AE sensor is provided on an outer surface corresponding to a surface that is always in contact with the liquid in the liquid supply unit.

Images