JPH0480971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gas-only indirect heating type wire annealing apparatus capable of continuously annealing metal wires such as conductive wires. More specifically, the present invention relates to a gas-only indirect heating type wire annealing apparatus capable of brightly annealing a wire by forcibly circulating exhaust gas heat generated by burning gas into an annealing furnace.

[Prior Art] Metal annealing methods are generally divided into batch annealing methods and continuous annealing methods.

The batch annealing method is a method in which metal articles are placed in a high-temperature annealing furnace and annealed for a certain period of time, and is suitable for annealing large-sized metal articles.

On the other hand, the continuous annealing method is suitable for annealing long wire rods and the like. This wire annealing apparatus is designed to anneal the wire by continuously passing it through a high-temperature annealing furnace.

The annealing furnace used in this wire annealing apparatus employs a heating method using an electric heater or gas combustion exhaust gas.

FIG. 4 is a front sectional view showing a conventional electric heater heating type wire annealing apparatus.

This conventional electric heater heating wire annealing equipment
It is composed of a wire rod inlet side guide roller 14, a wire rod outlet side guide roller 13, an annealing furnace 20, and a cooling water tank 12. An electric heater 21 is installed as a heat source in the inner lower part of the annealing furnace 20, and annealing pipes 22 through which wire rods 23 pass are arranged in multiple rows on the upper side of the electric heater 21. An inert gas introduction section is provided on the exit side.

This conventional electric heater heated wire annealing equipment
The wire 23 to be annealed is continuously fed into the annealing pipe 22 via the guide roller 14, and is heated and annealed by passing through the annealing pipe 22.

However, this conventional electric heater-heated wire annealing apparatus uses an electric heater, which has the highest energy cost, as a heat source, so there is a drawback that the cost for annealing the wire becomes the highest. Furthermore, this conventional electric heater heating type wire annealing apparatus has the disadvantage that the temperature distribution within the annealing furnace 20 becomes non-uniform because a forced circulation system cannot be used due to the space.

Therefore, a gas combustion exhaust gas direct heating type wire annealing apparatus that utilizes gas combustion exhaust gas heat, which has the lowest energy cost as a heat source, has been put into practical use.

FIG. 5 is a front sectional view of such a conventional gas combustion exhaust gas direct heating type wire annealing apparatus.

As can be seen from FIG. 5, the conventional gas combustion exhaust gas direct heating type wire rod annealing apparatus basically consists of a wire rod inlet guide roller 14, a wire rod outlet guide roller 13, an annealing furnace 30, and a cooling water tank 12. There is.
A gas combustion burner 31 is installed in the annealing furnace 30, and the gas combustion exhaust gas is passed through a forced circulation device 32.
This allows for forced circulation to the upper matsufuru 33 and lower matsufuru 34.

Further, as can be seen from FIG. 5, the wire rod 35 is annealed by directly passing through the annealing furnace 30, so the wire rod 35 comes into direct contact with the gas combustion exhaust gas that is forcedly circulated inside the annealing furnace 30. I'm starting to do that.

Therefore, in order to prevent oxidative discoloration of the wire rod 35, that is, to enable bright annealing, it is essential to use incomplete combustion exhaust gas containing reducing CO gas as the gas combustion exhaust gas forced to circulate inside the annealing furnace 30. It is becoming.

However, when gas is incompletely combusted, the calorific value is naturally small, and a large amount of fuel gas is inevitably consumed.As a result, the excellent energy cost reduction effect that gas originally has is not exhibited at all, and the reaction It has become clear that energy costs will increase as a result.

Furthermore, incomplete combustion of gas means gas explosions, deterioration of the working environment, and CO2 in the gas combustion exhaust gas.
This leads to variations in concentration to oxygen concentration, resulting in variations in annealing due to variations in heat generation, and oxidation changes due to variations in CO concentration to oxygen concentration.

Furthermore, the conventional gas combustion exhaust gas direct heating type wire rod annealing apparatus has the disadvantage that since the wire rod 35 enters the annealing furnace directly, adjacent wire rods may come into contact with each other and be damaged due to wire contact during feeding.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above and to exhibit an excellent thermal energy reduction effect. Another object of the present invention is to provide a gas-fired indirect heating type wire annealing device that can perform complete bright annealing in the longitudinal direction even if annealed continuously for a long period of time.

[Means for Solving the Problems] The gist of the present invention is to install an inlet-side guide roller that guides a wire to be annealed, and to install the guide roller at an angle so that the wire-inlet-side guide roller side is higher and the wire-rod outlet-side guide roller side is lower. In a wire rod annealing apparatus consisting of an annealing furnace, a cooling water tank, and a wire rod outlet side guide roller that can be immersed and rotated in the cooling water tank, the inside of the annealing furnace is connected to the inlet side. The section is divided into an upper Matsufuru section and a lower Matsufuru section via an intermediate partition wall, and an outlet side communication section, and a forced circulation device is installed above the inlet side communication section. A gas combustion burner is installed in the upper matsufuru near the outlet side, and a pressure regulating duct is opened on the upper outer wall of the upper matsufuru near the outlet side communication part. A gas-only indirect heating type wire rod annealing apparatus is characterized in that an annealing pipe provided with an inert gas inlet is fixed so as to penetrate through both ends in the longitudinal direction of an annealing furnace.

[Function] The gas-only indirect heating type wire rod annealing apparatus of the present invention includes: (a) an inlet-side guide roller that guides the wire to be annealed, an annealing furnace, a cooling water tank, and is capable of rotating while being immersed in the cooling water tank. By installing guide rollers on the wire rod exit side in a straight line, long wire rods can be continuously fed and annealed.
By installing the annealing furnace at an angle so that the wire rod inlet side guide roller side is higher and the wire rod outlet side guide roller side is lower, the temperature of the wire fed into the annealing furnace is gradually increased. Homogeneous annealing is performed, and the inert gas is introduced from the inert gas introduction part of the annealing furnace pipe that penetrates to the annealing furnace exit side. The inside of the annealing furnace is It is divided into an inlet side communication part, an upper Matsuful part and a lower Matsuful part separated through an intermediate partition wall, and an outlet side communication part,
A forced circulation device is installed above the communication part on the inlet side, and a gas burner is installed in the upper Matsufuru near the forced circulation device, so that the gas is completely combusted on the inlet side of the upper Matsufuru. The generated combustion exhaust gas is then forced to flow from the outlet side of the upper Matsufuru to the outlet side communication section, the lower Matsufuru, and the inlet side communication section using a forced circulation device. The annealing furnace pipe inserted into the lower part of the annealing furnace is heated uniformly and gently indirectly so that the outlet side is high temperature and the inlet side is low temperature, thereby uniformly annealing the wire rod, d By opening a pressure regulating duct in the upper outer wall of the upper matsufuru near the outlet side communication part, the pressure regulating damper in the pressure regulating duct is opened when the temperature inside the annealing furnace becomes high. A part of the high-temperature annealing exhaust gas is discharged to keep the temperature constant. By penetrating through and fixing to the side, it completely blocks the oxidizing combustion exhaust gas in the annealing furnace from the inside of the annealing pipe, allowing complete bright annealing of the wire rod, and also completely prevents cold air from entering from the atmosphere. The outlet end of the annealing furnace pipe is completely submerged into the cooling water tank, and the inert gas is smoothly fed from the inert gas inlet, and the wire rod is inserted into the annealing pipe. By passing the wire through the wire, mutual contact damage due to wire runout is completely eliminated, and these components a to e work synergistically to significantly improve thermal efficiency, provide excellent bright annealing of the wire, and achieve uniformity. High-quality annealed wire can be stably and inexpensively obtained by performing such annealing.

[Example] Next, an example of the gas combustion indirect heating type wire annealing apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is a front sectional view showing an embodiment of the gas-only indirect heating type wire annealing apparatus of the present invention.

In FIG. 1, reference numeral 1 denotes an annealing furnace installed in an inclined manner. A partition wall 2 is interposed inside the annealing furnace 1, and an upper Matsufuru 3 and a lower Matsufuru 4 are formed separately. They are communicated via an outlet side communication section 5 and an inlet side communication section 6 provided on both sides of the partition wall 2.

Further, a gas combustion burner 7 is installed inside the upper matsufuru 3, and a forced circulation device 8 for forcibly circulating the gas combustion exhaust gas into the annealing furnace 1 is installed inside the upper matsufuru 3 above the inlet side communication section 6. is set up.

Further, in FIG. 1, reference numeral 9 denotes an annealing pipe through which the wire rod 10 passes, and as shown in FIG. It penetrates and is fixed like this.

Further, an inert gas introduction part 11 is provided on the exit side of the annealing pipe 9 to introduce an inert gas such as water vapor into the annealing pipe 9. The outlet end of the annealing pipe 9 is immersed in a water tank 12 for cooling the wire rod, thereby blocking oxygen and cold air from entering from the outside world.

Here, in the gas-only indirect heating type wire annealing apparatus of the present invention, the inlet side of the annealing pipe 9 is high and the outlet side is low.
The inert gas such as water vapor sent out from the annealing pipe 9 advances from the outlet side of the annealing pipe 9 toward the inlet side of the annealing pipe 9, and is then discharged from the inlet of the annealing pipe 9 into the atmosphere. The inlet of the annealing pipe 9 is configured to be able to block oxygen from entering the atmosphere by the pressure of an inert gas such as water vapor sent out from the inert gas introduction part 11.

13 is a guide roller on the wire rod outlet side, 14 is a guide roller on the wire rod inlet side, 15 is an exhaust gas duct for discharging gas combustion exhaust gas when adjusting the pressure inside the annealing furnace 1, and 16 is a damper for adjusting the pressure inside the annealing furnace 1. be.

According to one embodiment of the gas-only indirect heating type wire annealing apparatus of the present invention, the gas is completely combusted in the annealing furnace 1, so that the energy efficiency is significantly improved while reducing the amount of gas consumed. Furthermore, unlike conventional gas-fired annealing furnaces, it is not necessary to control the O and CO concentrations of the combustion gas, so the annealing temperature can be made more uniform, and the wire 10 can be heated indirectly through the annealing pipe 9. This allows for excellent bright annealing and homogeneous annealing, resulting in high quality annealed wire rods.

Moreover, since the wire rod 10 is indirectly heated through the annealing pipe 9, there is no mutual contact between the wire rods 10 due to wire touching, and the occurrence of surface scratches can be completely prevented, and as a result, there are no surface defects in the annealed wire rod. It can be done.

FIG. 3 is a side sectional view of another embodiment of the gas-only indirect heating type wire annealing apparatus of the present invention.

In FIG. 3, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

In another embodiment, annealing pipes 9 are arranged in two stages in multiple rows in the lower matsufuru 4 of the annealing furnace 1. According to such a configuration, the number of wire rods 10 passed through the furnace can be reduced. Since it can be doubled, energy efficiency can be further improved.

[Effects of the Invention] As described above, according to the present invention, energy costs can be significantly reduced, and wire rods can be brightly annealed uniformly, and as a result, high-quality annealed wire rods can be obtained. Useful.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the gas-only indirect heating wire annealing apparatus of the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is a gas-only indirect heating type wire annealing apparatus of the present invention. FIG. 4 is a front sectional view showing a conventional electric heater heating type wire annealing device, and FIG. 5 is a conventional gas combustion exhaust gas direct heating type. It is a front sectional view showing a wire annealing device. DESCRIPTION OF SYMBOLS 1...Annealing furnace, 2...Partition wall, 3...Upper matsufuru, 4...Lower matsufuru, 5...Outlet side communication section, 6...Inlet side communication section, 7...Gas combustion burner, 8... Forced circulation device, 9, 22... Annealed pipe, 10, 23, 35... Wire rod, 11... Inert gas introduction section, 12... Cooling water tank, 13... Wire rod outlet side guide roller, 14... Wire rod Entrance side guide roller, 15... Duct for exhaust gas, 16... Damper for pressure adjustment, 20... Annealing furnace, 21... Electric heater.

Claims (1)

[Claims] 1. An inlet guide roller that guides the wire to be annealed, an annealing furnace that is installed at an angle so that the wire inlet guide roller is higher and the wire outlet guide roller is lower, a cooling water tank, and immersion in the cooling water tank. In a wire annealing device in which guide rollers on the wire outlet side that can rotate are lined up in a straight line, the inside of the annealing furnace is partitioned into an upper matsufuru and a lower matsufuru through an inlet side communication section and an intermediate partition wall. A forced circulation device is installed above the inlet side communication portion, and a gas-only burner is installed in the upper portion near the forced circulation device. A pressure regulating duct is opened in the upper outer wall of the upper matsufuru near the outlet side communication part, and an inert gas introduction part is provided on the outlet side in the lower part of the inside of the annealing furnace. 1. A gas-fired indirect heating type wire annealing apparatus, characterized in that an annealing pipe provided with the annealing furnace is fixed so as to penetrate through both ends in the longitudinal direction of the annealing furnace.