JPH0220686Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention displays the positions of defects, such as surface flaws, detected in steel pipes that are manufactured and being transported, at visual inspection locations and maintenance work locations in subsequent processes, and detects steel pipe defects. This invention relates to a position display monitor for defective parts of steel pipes, which allows visual inspection and maintenance work to be carried out reliably.

In general, manufactured steel pipes are inspected for the presence or absence of defects such as surface flaws over their entire length by a defect detection means such as a flaw detector, for example, while being transported to a subsequent process by a vertical conveyor.

The position of the defective part of the steel pipe detected by the defect detecting means is determined by a steel pipe passing time measurement signal from the defect detecting means, a defective part detection signal of the steel pipe synchronized with this passing time measuring signal, and a steel pipe speed detecting means. The speed detection signal is inputted to the calculation storage means, and is calculated and stored by the calculation storage means as the marking command timing corresponding to the position of the defect in the longitudinal direction of the steel pipe.

In the process of the steel pipe passing through the marking means provided on the exit side of the defect detection means,
The marking means is actuated by a marking command signal from the calculation storage means, and a marking is applied to a portion corresponding to the position of the defect in the longitudinal direction of the steel pipe.

Marked steel pipes (steel pipes that are not marked unless there are defects) are transferred from the vertical conveyor to the cross skid table, and are visually inspected at any point along the skid table line. , a visual inspection of the marked steel pipe is carried out, and defective parts are repaired at the repair work site.

Note that the lateral skid table is controlled to stop during visual inspection of the steel pipe and repair work for defective parts.

By the way, when visually inspecting a steel pipe and cleaning a defective part, markings made on the steel pipe are not visible if they are on the opposite side or below the visual inspection position, so it is easy to overlook the markings of the defective part.

Furthermore, the length of the steel pipe is approximately 12 m, and it is extremely inefficient to scan the entire length and circumference of this long steel pipe with the naked eye, and defects are easily overlooked.

Therefore, there is a possibility that visual inspection of defective parts and maintenance work cannot be carried out reliably, resulting in a problem of lowering reliability in terms of quality assurance of the product.

The present invention has been made to solve the above-mentioned conventional problems, and an embodiment thereof will be described below with reference to FIG. 1.

In FIG. 1, 1 is a vertical conveyor that vertically conveys the steel pipe P, and 2 is a first defect detection means (leakage flux flaw detector that detects surface defects) provided in the line of the vertical conveyor 1. , 3 is the first
A second steel pipe speed detection means 4 for detecting the speed of the steel pipe P on the exit side of the first defect detection means 2 is a second steel pipe speed detection means 4 that is provided at a required distance in the exit side direction of the first defect detection means 2. Defect detection means 2 (an ultrasonic wall thickness measuring device for detecting wall thickness defects and lamination defects), and 5 a second steel pipe speed that detects the speed of the steel pipe P on the outlet side of the second defect detection means 4. Detecting means 6 is a marking means provided at a required distance in the exit direction of the second defect detecting means 4; 7 is a marking means provided at the end of the vertical conveyor 1 on the line of the vertical conveyor 1; A skid table for cross-feeding the steel pipe P, which is provided in a direction perpendicular to the
Reference numeral 8 denotes a defective part position display means provided at an upper position of a visual inspection place and a maintenance work place at any point on the line of the traversing skid table 7; 2
As shown in the figure, the length is approximately equal to the length of the steel pipe P, and the required regular intervals (200mm
There are 80 lamps 8a (interval),
When the marked steel pipe P is located directly below the defect position display means 8, the traversing skid table 7 is controlled to stop by an arbitrary means, and a defect position signal from the calculation storage means to be described later is used. , the lamp 8a corresponding to the position of the defective part, b in the steel pipe P, or the lamp 8a closest to the position of the defective parts a, b, is turned on.

The reason why the first and second steel pipe speed detection means 3 and 5 are provided is that acceleration and deceleration control of the vertical conveyor line is performed independently for each required section in order to reduce the dead zone at the end of the steel pipe. ,Therefore,
The speed detection means 3 and 5 respectively detect the speed of the steel pipe.

Therefore, the positions of defects such as surface flaws on the steel pipe P detected by each of the defect detection means 2 and 4 are as follows:
The transit time measurement signals 2a and 4a of the steel pipe P from each defect detection means 2 and 4, and the transit time measurement signal 2
The defect detection signals 2b, 4b of the steel pipe P, which are synchronized with the signals 2b, 4a, and the speed detection signals 3a, 5a from the respective steel pipe speed detection means 3, 5 are input signals to the calculation storage means 9. , is calculated and stored by this calculation storage means 9 as the (defect position) in the longitudinal direction of the steel pipe P and the marking command timing corresponding to this defect position. The file is divided into 200mm intervals, and the location and type of defect in each corresponding location is calculated and stored.

During the process of the steel pipe P passing through the marking means 6, the marking means 6 is activated by the marking command signal 9a from the calculation storage means 9, and marking is applied to a portion corresponding to the position of the defect in the longitudinal direction of the steel pipe P. be done.

The marked steel pipes P (steel pipes that would not be marked unless there are defects) are aligned at the end of the vertical conveyor 1 by a steel pipe aligning means, and transferred from the vertical conveyor 1 to the horizontal skid. When the steel pipe P is transferred to the table 7 and positioned directly below the defect position display means 8, the lateral skid table 7 is controlled to stop,
The steel pipe P stops at a position directly below the defect position display means 8.

Incidentally, the steel pipe P without any defects is conveyed as it is by the traverse skid table 7 without stopping.

At the same time as the steel pipe P stops directly below the defect position display means 8, a defect position signal 9b in the longitudinal direction of the steel pipe P is input from the calculation storage means 9 to the defect position display means 8, and the defect position a in the steel pipe P is , b or the lamp 8a closest to the position of the defective parts a and b is lit. That is, marking is carried out in accordance with the calculated and stored defective bit, and the lamp 8a at the corresponding position is lit. Regarding marking, the circumferential direction of the steel pipe is divided into 16 parts and the corresponding positions are marked.

Workers at the visual inspection location and maintenance work location use the lamp 8 in the defect location display means 8.
A visual inspection and cleaning of defective parts are carried out while aiming at the lighting position a and checking with the above markings. After that, the conveyance of the steel pipe P is restarted, and the steel pipe P is vertically moved from the cross-feeding skid table 7. It is transferred to the feed conveyor 10 and conveyed to other processes.

As described above, according to the present invention, the calculation and storage signal of the defect position in the longitudinal direction of the steel pipe allows
Operate defective part position display means provided at the visual inspection place and maintenance work place for defective parts of the steel pipe,
This lights up the lamp at the location corresponding to the position of the defect in the longitudinal direction of the steel pipe, making it extremely easy to confirm the position of the defect in the longitudinal direction, even if the length of the steel pipe is around 12 m. Therefore, the work efficiency of visual inspection can be improved, and defective parts can be prevented from being overlooked, so reliability in terms of quality assurance of the product can be greatly improved.

This invention is applicable not only to steel pipes. It is also fully applicable as a position display monitor for defective parts in steel materials such as steel bars and steel plates.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a perspective view showing an example of indicating the position of a defective portion of a steel pipe. DESCRIPTION OF SYMBOLS 1... Longitudinal conveyor, 2... First defect detection means, 3... First steel pipe speed detection means, 4...
Second defect detection means, 5... Second steel pipe speed detection means, 6... Marking means, 7... Traverse skid table, 8... Defect position display means, 9...
...Arithmetic storage means, P...steel pipe.

Claims (1)

[Scope of utility model registration request] A defect detection means provided in a vertical steel pipe feed line and outputting a steel pipe passage time measurement signal and a steel pipe defect detection signal synchronized with the passage time measurement signal, a steel pipe speed detection means, and the steel pipe speed detection means. Based on the speed detection signal from the means, the transit time measurement signal from the defect detection means, and the defect detection signal,
A calculation storage means for calculating and storing a defect position in the longitudinal direction of the steel pipe and a marking command timing corresponding to the defect position, and a marking command signal from the calculation storage means to determine the position of the defect in the longitudinal direction of the steel pipe. A steel pipe transverse feed line provided in a direction perpendicular to the longitudinal feed line at the end of the vertical feed line, which has a marking means for marking a portion, and a steel pipe aligning means for aligning pipe ends of the steel pipe; A large number of lamps, each having a length approximately equal to the length of the steel pipe, are provided at required regular intervals in the longitudinal direction, and are installed at the upper position of the visual inspection and maintenance work area for steel pipe defects in the steel pipe. When the transverse feed line is located at the location and maintenance work location, the transverse feed line is stopped, and a lamp corresponding to the defect location in the steel pipe or a lamp closest to the defect location is turned on based on the defect location signal from the arithmetic storage means. A monitor for displaying the position of a defective part of a steel pipe, comprising a part position display means.