JPS6020298B2 - Forced transfer device for steel pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a forced transfer device for steel pipes, which forcibly transfers steel pipes using magnetic driving force when rolling the steel pipes.

Generally, a steel pipe manufacturing department in a steel mill or the like uses a low-flow conveyor, a chain conveyor with an attachment, etc. to transport the manufactured steel pipes, forming one line.

In order to facilitate transfer between lines, adjustment of waiting time for machining equipment before and after, inspection, marking, drying after application of rust preventive, etc., we have installed multiple rails with slopes, and run on these skid rails. A steel pipe is rolled in free fall. On this skid rail, steel pipes accelerated by gravity collide with each other, producing impact noise. In order to reduce the sound of the steel pipes colliding and to prevent the steel pipes from being deformed or bruised due to collisions, the slope of the skid rail is made gentler, thereby minimizing the noise and bruises as much as possible. However, when multiple steel pipes are stopped on a skid line during the production process, free fall transfer is not possible for steel pipes with uneven surfaces or large bends, such as steel pipes after coating, due to the loose slope.

In addition, electromagnets are installed in parallel to skid rails, and these electromagnets apply eddy current to the steel pipes to apply braking to minimize collision noise and bruises, but in this case, there are also beads on the steel pipes. and will not be able to transfer.

In order to solve this problem, the present applicant first proposed the
No. 3-91476 proposed a method in which a large number of electromagnets are arranged in parallel on a skid rail, and by sequentially exciting these electromagnets, a moving magnetic field is generated to apply a driving force to a steel pipe in the direction of an inclined surface.

This Tokuren No. 53-91476 will be briefly explained with reference to FIG.

FIG. 1a is a plan view, and FIG. 1b is a side view. Magnets M, . M2...
- The steel pipe 10 is forcibly transferred by sequentially energizing M3 and repeating this energization.

The magnets M, ~M5 transferred in this way are connected to the coil 11.
, a magnetic pole 12, and a magnetic frame 13. For example, even if the steel pipe 10 is stopped at a position above the magnet M8, the excitation of the magnet M4 causes the steel pipe 10 to be transported by its magnetic attraction force. FIG. 2 shows the excitation time of magnets M, to M5. T, magnet M
, only is excited, only magnet M2 is excited with T2...
The magnets are sequentially excited so that... Therefore, each coil is energized every T seconds. However, since the magnetic pole 12 is parallel to one surface of the skid rail, the magnetic attraction force is the same between points A and B on the magnetic pole 12 (because the gap between the steel pipe and the magnetic pole is the same, the magnetic attraction force is the same). (same resistance)
becomes.

Therefore, if the steel pipe 10 stops at point A, it may not be possible to attract the next magnet even if it is energized. To prevent this, it would be possible to use a strong magnet to ensure suction, but this would be uneconomical. The present invention has been made in response to the above-mentioned problems, and its purpose is to provide a forced transfer device for steel pipes that can increase the suction force for steel pipes.

A feature of the present invention is that the upper end of the magnetic pole portion of the electromagnet is tapered. An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

As shown in Fig. 3, the electromagnet has a coil 11 and a main magnetic pole 12a.
, an auxiliary magnetic pole 12b, a magnetic frame 13, a non-magnetic plate 14, and a stand 15.The number of magnetic poles 12 and magnetic frames 13 depends on the length of the device.
The upper end of the skid rail 2 is tapered at a predetermined angle with respect to the upper surface of the skid rail 1 in the steel pipe transfer direction (arrow direction).

Therefore, when comparing the magnetic attraction forces at points A and B, the distance between the steel pipe 10 on the skid rail 1 and the magnetic pole 12 is shorter at point B, so the magnetic resistance is smaller and the magnetic attraction force is larger. Therefore, since the steel pipe 10 is always attracted to point B and never stops at point A, the steel pipe is reliably transferred to point B of the next magnetic pole by the next magnet excitation. The excitation of the magnets is sequentially switched as shown in FIG. As described above, according to the present invention, it is possible to easily prevent steel pipes from stagnation on a skid line when transporting coated steel pipes or steel pipes with large bends.

As a result, productivity of the manufacturing line can be improved.

[Brief explanation of drawings]

Fig. 1 shows an example of a forced transfer device for steel pipes to which the present invention is applied.
The figure is a time chart showing the excitation timing of the magnet, FIG. 3 is a sectional structural view of an embodiment of the present invention, and FIG. 4 is a side view thereof. 1...Rail, 10...Steel pipe, 11...Coil, 12.
...Magnetic pole, M, ~M5...Magnet. Multi-1 drawing Pig 2-ticket 3 drawing Multi-4 drawing

Claims (1)

[Claims] 1 It has a plurality of rails arranged at an angle from the carry-in end to the discharge end, and a large number of electromagnets arranged along the longitudinal direction of these rails, which attract steel pipes when excited. A steel pipe forced transfer device characterized in that the upper ends of the magnetic pole parts of these electromagnets are tapered.