JPS6254367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for threading relatively easily flexible steel wires and steel rods into a heat treatment furnace that can be reliably inserted into a heat treatment furnace equipped with hearth rolls without getting caught on the rolls or the like.

Conventionally, as a heating furnace for steel wires, there is a patenting furnace, for example, which does not have a hearth roll. In such a heating furnace, the internal cross-section of the furnace is relatively wide, and the length of the furnace is approximately 25 to 30 meters even in a large furnace, and support pillows are installed at appropriate pitches on the hearth or wall of the furnace. Heating in such a furnace is done with the wire standing still, but when running the wire, if the furnace temperature is room temperature, the wire rod should be 10 mm
After pushing in the wire rods from the hearth one by one and using them as one guide wire to thread them onto the support pillow, the processed wire rods are threaded one by one through the guide wire using a wire threading tool to complete the threading work. ing.

However, if the guide wire gets caught on a support pillow or the like during the process, it is time consuming to restore the wire to a state where it can be passed through the work opening provided on the side of the furnace and complete the wire threading.

By the way, recently, barrel furnaces are equipped with rotatably driven hearth rolls for feeding wire rods, have a relatively small internal cross-section, and have a long furnace length of 40 m, etc., so that they can be used even during high-temperature operation. It has been proposed that a wire be continuously inserted through the wire and heated. In such a case, the temperature inside the furnace is high, and it is difficult to manually prevent the tip of the inserted wire from hanging or getting caught on the hearth roll.

In view of these circumstances, an object of the present invention is to provide a method for passing the tip of a wire through a hearth roll or the like.

In the method for threading wire into a heat treatment furnace according to the present invention, when starting wire threading, a steel bar-shaped guide member is attached to the tip of the wire, and the guide member is placed at the beginning without causing any drooping or the like. The wire is fed by driving a hearth roll.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

This example is PC (prestressed concrete)
This is applied to the passage of industrial steel wire to a heating barrel furnace.

In the wire passing method according to this embodiment, the wire rod 4 is supplied from the pinch roller 3 on the entrance side to the hearth roll 2 of the barrel furnace 5, and the guide member 1 is attached to the tip of the wire rod 4 coming out from the pinch roller 3. I try to do that.

The guide member 1 has a main body 1A in the form of a flat rod having a substantially square cross section and having rigidity and heat resistance, with a cylindrical wire attachment portion 1B protruding from the main body 1A. The length of the main body is, for example, three or more pitches of the hearth roll 2 in the barrel furnace 5, so that it can be fed on the hearth roll 2 without tilting. An upwardly curved inclined surface 1C is formed at the opposite wire attachment part of the main body 1A, that is, at the lower surface of the tip, so that the main body 1A can move smoothly on the hearth roll 2 without colliding with it. Incidentally, the inclined surface 1C may be formed by bending the entire tip portion of the main body 1A upward, for example, as shown by the imaginary line in FIG. In addition, the wire rod attachment part 1B includes a set screw 1D for fixing the tip of the wire rod 4.
has been established. In addition, a wedge is used instead of the set screw 1D.
The wire fixing means may be a chain or the like.

Therefore, when passing the wire to the barrel furnace 5, the wire rod attachment part 1B of the guide member 1 is fixed to the tip of the wire rod 4 projected from the pinch roll 3, and the tip side of the guide member 1 is placed on the hearth roll 2. Drive hearth roll 2. By doing so, the wire rod 4 will move forward with the guide member 1 at the beginning by being pushed by the pinch roll 3 and rotated by the hearth roll 2, and even if the wire rod 4 may hang down due to bending, the rigid guide The wiring can be completed without causing any inconvenience such as the member 1 getting caught on the hearth roll 2. After that, the guide member 1 that has come out of the furnace can be removed from the wire rod 4.

Therefore, wiring work can be carried out even when the furnace temperature is high, and troublesome manual assistance during wiring can be omitted.

Note that the wiring method according to this example is based on the effective diameter inside the furnace.
500mm〓, the furnace temperature is approximately 40m for a barrel furnace with a furnace length of approximately 40m.
When we carried out the wiring of 10cm steel wire at 800℃, we confirmed that the above work could be carried out reliably.

In addition, in the above embodiment, the guide member 1 was set to a length corresponding to three pitches of the hearth roll 2.
This is a suitable example to avoid getting caught on the hearth roll 2, and in some cases 2 pitches,
It can be changed as appropriate depending on the diameter of the wire rod 4 and the feed speed, such as 2.5 pitches or 3 pitches or more.

Further, it goes without saying that the specific components such as the shape of the guide member can be modified in various ways other than those of the above-described embodiments.

As detailed above, according to the present invention, the guide member is installed at the tip of the wire and fed into the furnace by the hearth roll, so there is no need to perform troublesome auxiliary operations during the wire threading. This allows wires to be routed smoothly and reliably, improving work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is an explanatory view showing a wire connection state, FIG. 2 is a plan view showing a guide member, and FIG. 3 is a side view of FIG. 2. 1... Guide member, 2... Hearth roll, 4...
...wire rod, 5...barrel furnace.

Claims (1)

[Claims] 1. In a method of passing a flexible wire into a heat treatment furnace through hearth rolls arranged at intervals in the furnace and driven to rotate, the tip of the wire has a length at least equal to or longer than the interval between the hearth rolls. A heat treatment furnace characterized in that a rod-shaped guide member having a rigidity and rigidity in the axial direction is attached, and the wire rod is fed into the heat treatment furnace by driving a hearth roll with the guide member at the top. wiring method.