JPH0648410Y2 - Multiple magnetic particle flaw detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a plurality of magnetic powder flaw detectors, and more particularly to an apparatus for detecting magnetic powder flaws in a long material such as a steel bar or a steel pipe.

[Prior Art] With a long material such as a steel bar and a steel pipe, defects such as cracks extending in the longitudinal direction of the material or a portion immediately below the surface may occur in a manufacturing process such as rolling and drawing. Magnetic particle flaw detection is widely used to detect such defects. Further, in order to detect a defect extending in the longitudinal direction of the material, it is necessary to form a magnetic field in the circumferential direction of the material. Therefore,
An energization method in which direct current or alternating current is directly applied in the longitudinal direction of the material is adopted.

In the energization method, the electrodes are brought into contact with both end surfaces of the material to energize the material. Since the steel bar or the steel pipe fluctuates in a considerable range, it is impossible to follow the fluctuation in the length of the material when the electrode is fixed. Therefore, for example, Japanese Utility Model Publication No. 34-7098 proposes a device in which at least one electrode is movable in the longitudinal direction of the material according to the length of the material.

[Problems to be solved by the invention] However, the conventional magnetic particle flaw detector for a long material can inspect only one material at a time, and the flaw detection work efficiency is low. Therefore, generally, a plurality of magnetic particle flaw detectors are required to match the flaw detection work efficiency with the manufacturing efficiency of rolling steel bar or expanding a steel pipe.

Therefore, the present invention intends to provide a magnetic particle flaw detector capable of simultaneously inspecting a plurality of long materials with one apparatus.

[Means for Solving the Problem] A magnetic particle flaw detector according to the present invention comprises a fixed base, a first walking beam type transfer device, and a second walking beam type transfer device.

The fixing table is arranged on the side of the material carrying-in device, and supports a plurality of materials in parallel at a plurality of longitudinal positions thereof.

The first walking beam type transfer device reciprocates between the material loading device and the fixed base, transfers a plurality of materials from the material loading device in a direction perpendicular to the longitudinal direction thereof and places them on the fixed base.

The second walking beam type transfer device reciprocates between the fixed table and the material discharging device, transfers a plurality of materials in a direction perpendicular to the longitudinal direction of the material, and sends out the material from the fixed table to the material discharging device. In addition, the second walking beam type transfer device has a partition member that separates adjacent materials in a direction perpendicular to the longitudinal direction of the materials. The partition member is made of an insulating material such as Bakelite so that the separated materials are not electrically connected to each other.

A pair of electrodes is disposed in contact with the end surface of the material in the moving path of the second walking beam type transfer device above the fixing table. Then, at least one of the pair of electrodes is composed of a plurality of electrodes that are in contact with the end faces of the respective materials, and the plurality of electrodes can move independently of each other in the material longitudinal direction. Electrode movement is pneumatic cylinder,
It is performed by a screw mechanism driven by a hydraulic cylinder or an electric motor.

[Operation] In the magnetic particle flaw detector constructed as described above, first, a plurality of materials are transferred from the material loading device in a direction perpendicular to the longitudinal direction of the first walking beam type transfer device so that they are arranged in parallel. And place it on the fixed table. The first walking beam type transfer device returns to the position of the material loading device when the material is placed on the fixed base. When the first walking beam type transfer device is separated from the fixed base, the second walking beam type transfer device scoops up the material on the fixed base, and temporarily stops above the fixed base. At this time, adjacent materials are separated from each other by an appropriate distance by the partition member.

Next, the paired electrodes are respectively drawn toward the end faces of the material, and pressed against the both end faces of the material supported by the second walking beam type transfer device. The material is then energized and magnetized. When the magnetization ends, the second
The walking beam type transfer device sends the material to the material discharge device and returns to the position of the fixed table.

The magnetic powder or magnetic powder liquid dispersed on the surface of the material is attracted to the defect due to the magnetization of the material, and forms a magnetic powder pattern indicating the defect. The magnetic powder or the magnetic powder liquid is sprayed on the material surface immediately before, at the same time as, or immediately after the energization.

[Embodiment] An embodiment will be described by taking as an example an apparatus for simultaneously performing magnetic particle flaw detection on two round steel bars. FIG. 1 is an overall plan view of the magnetic particle flaw detector, and FIG. 2 is an enlarged side view of a main part of the apparatus shown in FIG.

The magnetic particle flaw detector comprises a steel bar carry-in device 1, a magnetic powder spray device 5,
Fixed stand 7, first walking beam type transfer device 11, second
It comprises a walking beam type transfer device 15, a magnetizing device 21, and a steel bar unloading device 31.

As shown in FIG. 1, the steel bar carrying-in device 1 extends from the rolling equipment outlet side to the flaw detection portion inlet side. The steel bar carry-in device 1 includes a large number of hourglass-shaped conveying rollers 2, and the conveying rollers 2 are rotationally driven by a motor (not shown). The transport roller 2 mounts two steel bars R and transports them in the longitudinal direction of the steel bars. Further, the steel bar carry-in device 1 includes a stopper 3 at the end of the carry-in line. The tips of the two steel bars R conveyed along the carry-in line hit the stopper 3 and the tips of the two steel bars R are aligned.

The magnetic powder liquid spraying device 5 is provided on the side of the steel bar carry-in device 1 and
It is arranged above the steel bar R transferred by the walking beam type transfer device 11. The magnetic powder liquid spraying device 5 has a slit (not shown) extending along the longitudinal direction of the steel bar R, and sprays the magnetic powder liquid from the slit to the surface of the steel bar passing below the slit.

The fixed base 7 is arranged below the magnetic particle liquid spraying device 5, and a plurality of V-shaped support hardware 8 arranged at intervals in the longitudinal direction.
Is equipped with. The fixed base 7 supports the two steel bars R at a plurality of positions in the longitudinal direction thereof. Since the support surface 9 of the support metal 8 is arcuate, the two steel bars R are supported substantially symmetrically with respect to the center of the support metal 8. If the support surface is V-shaped, the two steel bars R may be biasedly supported, and when the two steel bars R are received by the second walking beam type transfer device 15, they are separated by the partition member 19. There is a fear that it will not.

The first walking beam type transfer device 11 includes a plurality of V-shaped supporting metal members 12 arranged at intervals in the longitudinal direction. The support hardware 12 has an arc-shaped support surface 13 like the fixed base 7. The first walking beam type transfer device 11 reciprocates between the steel bar carry-in device 1 and the fixed base 7, and two steel bars R
Is transferred from the steel bar carry-in device 1 in a direction perpendicular to the longitudinal direction thereof and placed on the fixed base 7.

The second walking beam type transfer device 15 is provided with a plurality of V-shaped supporting hardware 16 arranged at intervals in the longitudinal direction,
A bakelite plate 17 is attached to the upper surface of the support metal 16 and serves as an insulating surface. The second walking beam type transfer device 15 reciprocates between the fixed base 7 and the steel bar unloading device 31, transfers the two steel bars R in a direction perpendicular to the longitudinal direction thereof, and carries out the steel bar from the fixed base 7. Send to device 31. Further, the second walking beam type transfer device 15 has a partition member 19 which separates the adjacent steel bars R in the direction perpendicular to the longitudinal direction thereof. The partition member 19 is made of a square Bakelite plate so that the separated steel bars R are not electrically connected to each other.

The electrodes consist of a first electrode 22 and a second electrode 24.
The second electrode 24 is composed of a pair of divided electrodes 24a and 24b.
Each of the electrodes 22, 24a, 24b is fixed to the tip of the shaft 27 supported by the bearing base 26, and the electrodes 22, 24a, 24b are movable independently of each other in the longitudinal direction of the steel bar. A rod of an air cylinder 28 is connected to an intermediate portion of the shaft 27 via an arm 29. The electrodes 22, 24a, 24b are arranged above the fixed table 7 so as to be in contact with the end faces of the steel bars R in the movement path of the second walking beam type transfer device 15. Split electrodes 24a, 24
b are close to each other as shown in FIG. When the diameter of the steel bar R is large (R '), two split electrodes 24a, 24
b is in contact with the end surface of the steel bar R '.

The steel bar unloading device 31 is arranged on the exit side of the fixed base 7, and is provided with a large number of hourglass-shaped conveying rollers 32. The transport roller 32 is rotationally driven by a motor (not shown) and the two steel bars R
Is placed and transported.

In the magnetic particle flaw detector constructed as described above, first, the first walking beam type transfer device 11 scoops up two steel bars R from the steel bar carry-in device 1 and transfers them in a direction perpendicular to the longitudinal direction of the steel bar R to fix the base. Place on 7. During the transfer,
When passing below the magnetic particle liquid spraying device 5, the magnetic powder liquid is sprayed on the surface of the steel bar R. The first walking beam type transfer device 11 returns to the position of the steel bar carry-in device 1 when the steel bar R is placed on the fixed base 7.

When the first walking beam type transfer device 11 separates from the fixed base 7, the second walking beam type transfer device 15 scoops up the steel bar R on the fixed base 7 and temporarily stops above the fixed base 7. At this time, the first electrode 22 and the second electrode 24 are respectively extended toward the end surface of the steel bar R and pressed against both end surfaces of the steel bar R supported by the second walking beam type transfer device 15. Then, the steel bar R is energized and magnetized. The magnetic powder or the magnetic powder liquid sprayed on the surface of the steel bar is attracted to the defective portion by the magnetization of the steel bar, and forms a magnetic powder pattern indicating the defect.

The second walking beam type transfer device 15 sends the steel bar R to the steel bar unloading device 31, and returns to the position of the fixed base 7. The steel bar R on which the magnetic powder pattern is formed has a defective portion marked by a flaw detection operator. After that, the steel bar unloading device 31 places two steel bars R and carries them out. Non-defective products are sent to the shipping yard, and defective products are sent to the defect removal workshop.

This invention is not limited to the above embodiment. For example, the number of long-sized materials to be flaw-detected at the same time may be three or more. In this case, the divided electrodes are required by the number of materials, and the partition member must also separate adjacent materials.

[Advantage of the Invention] According to the magnetic particle flaw detector of the present invention, it is possible to perform flaw detection on a plurality of long steel bars by one apparatus, and it is possible to improve the efficiency of flaw detection work and to make the flaw detection apparatus economical.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an overall plan view of a magnetic particle flaw detector, FIG. 2 is an enlarged side view of a main part of the apparatus shown in FIG. 1, and FIG. 3 is an enlarged side view of an electrode on the side of FIG. 1 ... Material carry-in device, 5 ... Magnetic powder spraying device, 7 ... Fixing base,
11 ... First walking beam type transfer device, 15 ... Second walking beam type transfer device, 19 ... Partition member, 21 ... Magnetizing device, 22, 24 ... Electrode, 28 ... Air cylinder, 31 ... Material unloading device, R, R ′… Long material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Hashiguchi 12 Nakamachi, Muroran City, Hokkaido Inside Nippon Steel Co., Ltd. Muroran Works (72) Inventor Yoshihiro Shinmachi 12 Nakamachi, Muroran City, Hokkaido New Japan Steel Co., Ltd.Muroran Co., Ltd. In-house (72) Inventor Makoto Otomo 2-8-3-501 Tsujido west coast, Fujisawa-shi, Kanagawa (72) Inventor Yasuhiro Kobayashi 1-8-513 Wakabadai, Asahi-ku, Yokohama-shi, Kanagawa (56) References 61-56967 (JP, A) JP 60-252256 (JP, A) Actual public 39-10298 (JP, Y1) Actual public 46-3276 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A material loading device (1) for loading a long material (R) into the flaw detection part entry side, a material unloading device (31) for unloading the material (R) from the flaw detection part exit side, and a material (R). ) Of the pair of electrodes (22, 24) facing each other in the longitudinal direction, and at least one of the electrodes is movable in the material longitudinal direction according to the length of the material (R), A fixing table (7) arranged laterally of the material loading device (1) for supporting a plurality of materials (R) in parallel at a plurality of locations in the longitudinal direction thereof, and the material loading device ( 1) and fixed base (7)
A first walking beam type transfer in which a plurality of materials (R) are reciprocated between the material transfer device (1) and the material transfer device (1) in a direction perpendicular to the longitudinal direction thereof and placed on the fixed base (7). The device (11), the fixed base (7) and the material unloading device (3
The second walking beam type transfer that reciprocates between 1) and transfers a plurality of materials (R) in a direction perpendicular to the longitudinal direction of the materials and sends them out from the fixed table (7) to the material unloading device (31). A second walking beam type transfer device (15) having a partition member (19) for separating adjacent materials (R) in a direction perpendicular to the longitudinal direction thereof,
The pair of electrodes (22, 24) is arranged so as to be contactable with the end surface of the material (R) in the moving path of the second walking beam type transfer device (15) above the fixing table (7), and the pair At least one of the forming electrodes (22, 24) is composed of a plurality of electrodes (24a, 24b) in contact with the end faces of the respective materials (R), and the plurality of electrodes (24a, 24b) are independent of each other. A plurality of magnetic particle flaw detectors which are movable in the longitudinal direction.