JPS6055412B2 - steel pipe transfer equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention forcibly transfers steel pipes by magnetic attraction force in order to prevent the steel pipes from stagnation when transferring the steel pipes by rolling.
, u-α 口゛-に(l＾ ι←゛,, n, ten-a-ha,
It concerns gongs, stoppers, and magnetic shapes.

Generally, steel pipe manufacturing departments in steel works etc. use chain conveyors with roller conveyor attachments to transport the manufactured steel pipes to form a single line, but the transfer between lines and the time required for machining equipment before and after the pipes are carried out. For adjustment, inspection, marking, drying after application of rust preventive agent, etc., multiple sloped rails are installed, and the steel pipes are allowed to freely fall and roll on these skid rails.

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 rails is made gentle to minimize noise and bruises. However, once the steel pipes are left on the skid line during the production process, even if you try to restart the steel pipes, if the slope is gentle, steel pipes with uneven surfaces or large bends, such as steel pipes after coating, will fall freely. This prevents rolling, which hinders the transport of steel pipes that flow one after another, causing problems in production.

We have previously proposed a device to prevent such noise and stagnation of steel pipes.

An example of this will be explained with reference to FIGS. 1 and 2. As shown in Fig. 1a, a plurality of magnets M1~ are arranged side by side as one group on the skid rail 1, and at regular time intervals, M1 excitation → M1 excitation cut off - M2 excitation cut off M3 excitation -...・・・
The magnets are excited in sequence as shown below.
By repeating these excitations, the steel pipe 10 can be transferred. FIG. 1b is a side view of the device, and magnet M1 to pigeon are coil 11, excitation 12, magnetic frame 13.
Consisting of For example, even if the steel pipe 10 is stopped at a position above the magnet M3, the steel pipe is transported by the magnetic attraction force generated by the excitation of the magnet M4. FIG. 2 shows the excitation time of magnets M1 to M5. T1 excites only magnet M1, T2 excites only magnet M2...
The magnets are sequentially excited so that...
Each coil is therefore energized every T seconds. However, in the above conventional apparatus, due to insufficient magnetic attraction force, sufficient steel pipe transfer force cannot be obtained, and the reliability of steel pipe transfer is impaired, and countermeasures are urgently needed.

Here, the state in which the steel pipe is attracted by the excitation coil will be explained using FIG. 3.

The magnetic attraction force P exerted on the steel pipe is expressed by the following equation. (
In order to increase the magnetic attraction force using equation 1j, the magnetic flux density Bg and the magnetic pole area A may be increased.

Further, the magnetic flux density Bg is expressed by the following equation. From equation (2), in order to increase the magnetic flux density Bg, that is, to increase the magnetic attraction force, it is sufficient to increase the coil induced magnetic force AT or to decrease the distance 1 g between the steel pipe and the magnetic pole.

Next, a concrete example will be explained with reference to FIGS. 4 and 5.

FIG. 4 shows a structure in which two excitation coils are used to increase the magnetomotive force of this device.

Excitation coils 11a, 11b, main magnetic pole 12a, auxiliary magnetic pole 1
2b, a magnetic frame 13, a non-magnetic plate 14, and a pedestal 15. There are two main magnetic poles 12a, one is N pole and the other is S pole.
It is excited to become a pole. Further, the magnetic frames 13 are each magnetically independent and are arranged in the longitudinal direction between the skids 1). The number of magnetic poles and magnetic frames is determined by dividing the length of the device by the mounting pitch. Figure 5 shows the shape of the magnetic pole to reduce the distance between the steel pipe and the magnetic pole.

As shown in the figure, the magnetic pole 12 moves the upper surface of the magnetic pole closer to the previous magnetic pole 1:2'' in the opposite direction to the steel pipe transfer direction (arrow) to reduce the distance from the steel tube 10. Also, the upper surface of the magnetic pole is moved relative to the upper surface of the skid rail 1. Since it has a taper, there is a difference in the magnetic pole attraction force between points A and B, and the steel pipe 10 is always attracted to point B.The method of excitation of the magnet is the same as the conventional example, and is a method of switching sequentially. .

As explained above, the magnetic flux density B between the steel pipe and the magnetic pole of the present invention
Compared to the conventional device, g'' is the (2×
413) times, or 2.7 times, and the power consumption is doubled (
(Because there are two excitation coils), the magnetic pole attraction force is seven times greater, making the device cheaper and more reliable than the conventional device.

Brief Description of the Drawings Figure 1a is a plan view of a conventional transfer device;
Fig. 1b is a side view of the conventional transfer device, Fig. 2 is a diagram showing the excitation timing of the magnet, Fig. 3 is a side view of the conventional device, Fig. 4a is a cross-sectional structural diagram of the present invention, and Fig. 4b is a plan view. Similarly, FIG. 5 shows a side view of the magnetic pole.

11a, 11b...excitation coil, 12a゛゜゜゛゜゛main magnetic pole, 13...magnetic frame, 15.
...... trestle.

Claims (1)

[Claims] 1 Electromagnets are installed on a large number of magnetic frames that are arranged in parallel on the skid rails along the transfer direction of the steel pipes with the skid rails oriented in the longitudinal direction, and are each magnetically independent. Therefore, in a steel pipe transfer device in which a plurality of steel pipes are divided into one group, and each group is repeatedly excited in synchronization and sequentially along the transfer direction, the steel pipes are placed on the magnetic frame. The provided electromagnet has auxiliary magnetic poles on both sides in the longitudinal direction of the magnetic frame, and has two main magnetic poles each having an excitation coil wound between the two auxiliary magnetic poles, and the upper surfaces of the main magnetic pole and the auxiliary magnetic pole are made of steel pipes. A steel pipe transfer device characterized in that the steel pipe transfer device is formed in a tapered shape so that the distance from the skid rail becomes shorter in accordance with the transfer direction of the steel pipe.