JPS6030970Y2 - Wire coil conveying device - Google Patents

Description

[Detailed description of the invention] The present invention is a wire coil used to uniformly cool a hot-rolled wire at an arbitrary cooling rate between 0.1°C per second and about 20°C per second while continuously transferring the wire. The present invention relates to a conveying device.

The hot-rolled steel wire rod is coiled from the winding head of a winding machine and placed on a transfer conveyor provided immediately after, and the wire rod coils are transferred by the transfer conveyor in a state in which they are shifted at regular intervals and overlap each other. Methods and devices for cooling while cooling are well known.

However, conventional cooling methods and devices cannot sufficiently eliminate temperature deviations due to differences in polymerization density of wire coils.
It was difficult to measure the uniformity of cooling.

Therefore, the present inventors developed the conventional method of cooling steel wire (0.1℃/
SeC ~ approx. 20℃/5ec) As an improvement to the method and equipment, a conveyor with multiple step portions is used to transport the wire coil, and the layer thickness is increased by increasing the number of polymerized wire rings per unit length of transport. We have developed a method and device (hereinafter referred to as the method and device) for cooling the wire while transferring it in a coiled state, and have confirmed that the desired effect can be obtained.

Here, the layer thickness coil means that the wire rods placed on the transfer conveyor (conveyor with stepped portions) are stacked on top of each other at regular intervals, and the wire rods are placed on a transfer conveyor (conveyor with stepped portions) at a thickness of 50% per 1'' in the wire coil transfer direction.
It means that there are ~550 rings.

An outline of this cooling method will be explained based on FIG. 1.

In FIG. 1, 1 is a laying head of a winding machine installed following a hot rolling mill and a cooling device (not shown), and 2 is a wire ring that is continuously fed in a ring shape from the laying head 1. 3 is a roller conveyor on which the wire ring 3 is placed and transferred; 4 is a step conveyor (elevating conveyor) following the roller conveyor 2; 5 is a heat insulating cover that surrounds the wire ring 3 together with the step conveyor 4; 5 is divided into a plurality of zones, and the wire ring 3 passing through the zone is cooled stepwise along a desired cooling curve to undergo transformation.

Reference numeral 6 denotes a conveyor for transferring the wire ring 3 that has come out of the heat retaining cover 5 and has finished cooling, and has a blast cooling section (not shown) for rapid cooling.

7 is a wire convergence device.

Wire ring 3 on the step conveyor 4 inside the heat insulation cover 5
is transported in the form of a non-concentric coil with overlapping layers, and is once loosened at the step of the step conveyor 4, allowing heat to be removed from the center of both sides of the dense coil (promoting heat dissipation).
We are trying to

FIG. 2 shows the details of the stepped portion of the stepped roller conveyor 4. The thick coiled wire ring 3 that has reached the stepped position falls from the upper conveyor 4a to the lower conveyor 4b, and this The rings are unraveled one by one and cooled by a refrigerant (air, inert gas, mist, water, etc. whose temperature is above atmospheric temperature or below the atmospheric temperature inside the heat insulating cover 5) from a refrigerant spray nozzle (not shown). .

When the wire ring 3 falls, the leading edge of the ring may fall between the rollers of the lower conveyor 4b, as shown in 3a, and may impede the transfer of the ring.

Since the wire needs to be cooled while being transported at a predetermined speed, such a plunging phenomenon is undesirable because it causes interruption of the line and reduces productivity.

Further, this plunging phenomenon is undesirable because it becomes one of the factors and causes the shape of the wire ring (wire coil) to become defective, which affects the quality.

Furthermore, wire rings (wire coils) due to this plunging phenomenon
If a defective shape occurs, it becomes difficult to equalize the temperature of the wire ring (wire coil) over the entire wire rod ring (wire rod coil).

The present invention solves the above-mentioned problems, and a) prevents the wire coil (wire ring) from sticking during transportation, prevents the occurrence of shape defects due to the coil being removed, and makes the temperature of the wire coil uniform throughout. It is an object of the present invention to provide a wire rod coil conveying device that can obtain effects such as the ability to reduce the number of wire rods.

That is, in order to achieve the above-mentioned object, the present invention provides a wire rod coil conveying device that winds hot rolled wire rod into a coil shape using a winding machine and transfers the wire rods in a group of mutually overlapping rings shifted at a constant interval. , the conveying device is a stepped conveyor, and a flat portion larger than the diameter of the wire ring is provided at the transfer portion on the upper side of the conveyor.

In the present invention, installing a coil thrust prevention device near the coil fall position of the lower conveyor at the step location is
There are no particular restrictions.

The applicant of this application has already filed an application regarding the provision of this coil thrust prevention device.

If the step conveyor 4 can be moved up and down, as in the case of a tilting cheeple system, for example, the step value can be appropriately selected depending on the quality target of the wire to be cooled.

However, in this invention, the step conveyor 4 can be raised and lowered freely.
It is not limited to whether it is a fixed type or not.Next, an embodiment of the present invention will be explained based on the drawings, and
A comparative example will also be explained.

FIG. 3 shows an example of the present invention in which one of the plurality of step conveyors 4 shown in FIG. 1 is shown in an enlarged diagram.

This step conveyor 4 has a wire ring 3 with a diameter of 1100 m.
/m.

The level difference at the step 8 between the upper conveyor 4a and the lower conveyor 4b is 400 rrI/m, and a 15 oom/m flat part 9 is provided at the transition part of the step. The angle θ is 5°.

Although the step conveyor 4 is shown enlarged in the diagram for convenience, it goes without saying that it is constituted by rollers shown in FIG. 2.

Using the stepped conveyor 4 according to the present invention, the results of a wire rod conveyance test are shown over time in FIGS. 4A to 4E.

The test conditions at this time were as follows.

<Test conditions> Wire ring diameter: 1100 m/mφ 500 kg/conveyor m Conveyor speed: 2.5 m/min Step value: 400 m/m In these figures, 11 indicates the nozzle for refrigerant spraying when removing the coil. shows.

First, as shown in FIG. 4A, the rolled wire becomes a thick layered coil 3 and is conveyed by the upper step conveyor 4a.
The first wire ring 3A is guided by the flat part 9, becomes parallel, and advances as shown in the figure, with the leading end coming into contact with the slope 10 of the lower conveyor 4b as shown in the figure, and is guided as shown by the arrow. direction, and the final end of the ring 3 reaches the upper conveyor 4a.
The herrings are separated from the flat part 9 of FIG. 4, and fall one by one on the inclined surface 10 as shown in FIG.

In the present invention, this state (phenomenon) is referred to as coil loosening, and when the coil is loosening, refrigerant is sprayed from a nozzle to the highest temperature part of the ring to equalize the temperature of the entire ring.

In the above, as shown in FIG. It is characterized in that a flat part 9 is provided in the part.

Although the length of this flat portion 9 depends on the diameter of the wire ring 3, those skilled in the art know that the diameter of the wire ring 3 is 100 mm.
Since it is 0 m/m or more, the length of the flat part 9 is 1500 m.
/m or more is preferable.

That is, by making the landing point R of the wire ring 4 (wire coil) 3 farther away as described above, it is possible to prevent the bumping at the stepped portion 8, and this also allows the shape of the wire ring (wire coil) 3 to be changed. As shown in FIG. 4, it can be conveyed to the lower conveyor 4a in good shape.

By realizing these, for example, the distance, position, spray direction, etc. between the discharge port of the refrigerant spray nozzle 11 and the wire ring 3 can be adjusted appropriately, so that the wire ring 3 can be cooled under optimal conditions. can.

Therefore, there is also the effect that the temperature of the wire ring 3 can be made uniform throughout.

On the other hand, the step conveyor 4' (in this example, the upper conveyor 4a'
, the lower conveyor 4b').

The test conditions are the same as in the case of the present invention, and the step conveyor 4
' configuration conditions are: distance between steps 4.5 m, slope angle 5
°.

The wire ring 3 is guided by the inclined surface 10' of the conveyor 4a' and conveyed as shown in FIG. As shown in the figure, the landing point R' becomes closer.

For this reason, the wire ring 3 is bound to the inclined surface 10' of the lower conveyor 4b', and the wire ring 3 inevitably bends T due to the action of the upper transfer section and the connecting wire ring, as shown in the figure. occurs.

Since this ring bending T occurs sequentially as shown in FIG.

Due to the occurrence of this coil bending T, conditions for refrigerant spraying, such as the distance between the discharge port of the nozzle 11 and the wire ring, the position, and the direction of spraying, become inappropriate.

Therefore, it is difficult to make the temperature of the wire ring (wire coil) 3 uniform throughout, and it is not possible to stably obtain the target quality.

Furthermore, it goes without saying that the occurrence of the above-mentioned coil bending T and the occurrence of bumps lead to interruptions in the line and impair productivity.

. As mentioned above, the flat part 9 is located at the joint part of the step conveyor 4.
The provision of this structure has a special technical significance in actual operation, and the feature of the present invention is that the wire rod coil conveying device is formed by a stepped conveyor provided with this flat portion 9.

As described above, the present invention has a speed of 0.1°C/sec to approximately 20°C/sec.
Since it can be used in the wire direct heat treatment method with a cooling rate of sec, the above-mentioned effects of (1) prevention of overhang, (2) prevention of shape defects due to coil removal, and (2) uniformity of the wire coil temperature throughout the entire wire rod are as follows. It will be even more beneficial.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a wire cooling line to which the present invention is applied, Fig. 2 is an enlarged side view of the stepped conveyor in Fig. 1, Fig. 3 is a side view showing an example of the present invention, Fig. 4 FIG. 5 is a time-lapse explanatory diagram showing a coil conveyance state according to the present invention, and FIG. 5 is a time-lapse explanatory diagram showing a coil conveyance state according to a comparative example. Explanation of symbols, 1... Laying head, 2...
... Roller conveyor, 3 ... Wire coil, 4
...Step conveyor, 4a...Upper side conveyor, 4b...Lower side conveyor, 5...
・・Heat insulation cover, 6・・・Conveyor, 7・・・・
...Focusing device, 8...Step location, 9...
・Flat part, 10... Inclined surface, 11...
Refrigerant spray nozzle.

Claims (1)

[Scope of Claim for Utility Model Registration] A wire rod coil conveying device that winds a hot-rolled wire rod into a coil shape using a winding machine and conveys it in a group of mutually overlapping rings staggered at a certain interval, the conveying device comprising: A wire rod coil conveying device characterized in that a flat portion 9 larger than the diameter of the wire rod ring 3 is provided at the transfer conveyor 4 with steps and at the waist and at the transfer point of the upper conveyor h of the conveyor.