JPH01142030A - Apparatus for annealing metal coil - Google Patents

Abstract

PURPOSE:To uniformly heat a metal coil at good heat efficiency by blowing hot blast to the metal coil from both sides in a charging chamber at the time of heating the metal coil, heating the blast coming out from the charging chamber by passing through a chamber setting heaters with a circulating fan and using the hot blast while circulating to heat the coil. CONSTITUTION:A heating furnace 1 is divided into an outside flowing passage 3 and an inside flowing passage 4 with divided plates 21, and the coil charging chamber 2 is arranged in the inner part thereof. Material 6 to be treated of Al strip coil, etc., is set in the coil charging chamber 2 and the hot blast is blown and heated to the Al coil 6 from movable supplying tubes 22 set at both sides of the Al coil 6 through a hot blast supplying tube 7. The blast, of which temp. is lowered by using to heating, is exhausted from blast passing-through holes 8 to the inside flowing passage 4 and sent to the outside flowing passage 3 by rotation of blades 11 of a fan 10 for circulation. Then, after heating the blast with the heaters 12 arranged in the inner part of the outside flowing passage 3 to high temp., again the hot blast is blown and heated to the Al coil 6 through the hot blast supplying tube 7 and the movable supplying tube 22, and the Al coil is uniformly heated and annealed at good heat efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for annealing metal coils such as aluminum coils.

[Prior art]

Conventionally, when annealing a metal coil such as an aluminum coil, as shown in FIGS. 5 and 6, a compartment 14 with an open bottom is provided in the vertically intermediate portion of the annealing furnace 13, and the annealing U-shaped heat transfer tubes 15 are arranged between the left and right side walls of the furnace 3 and the left and right side walls of the compartment 14, and a plurality of ventilation holes are provided in the middle of the top plate of the compartment 14 in the left and right direction. 16
are provided at intervals in the front-back direction, and the rotary blades 11 of the circulation fan 10 fixed to the upper part of the annealing furnace 13 are arranged in the ventilation hole 16, and on both left and right sides of the lower part of the compartment 14,
A plurality of metal coils 17 extending in the left-right direction and arranged at intervals in the front-rear direction are placed on a tray 18 and carried in, and the atmosphere in the furnace is heated by the heat transfer tubes 15, and the circulation fan 10 is operated. Then, the heated furnace atmosphere, that is, hot air, is caused to flow from the bottom of the left and right sides of the compartment 14 toward the center of the bottom of the compartment 14, and then through the vent 1.
6, the annealing furnace 13 and the compartment chamber 14
The metal coil 17 is annealed by the circulating flow of the hot air.

[Problem that the invention seeks to solve]

As in the conventional annealing method, the hot air is caused to flow from the lower portions of the left and right sides of the compartment chamber 14 toward the lower center of the compartment chamber 14, and then to flow upward toward the opening 9 in the center of the compartment chamber 14. In this case, the hot air velocity passing through the lower part of the metal coil 17 is significantly slower than the hot air velocity passing through the upper part of the metal coil 17, and the hot air contact ratio in the central part of the furnace below the metal coil 17 is significantly lower. As the temperature decreases, a large temperature difference occurs between each part' of the metal coil 17.

In order to reduce the temperature difference between each part of the metal coil 17 and keep it within the allowable range, it is necessary to lower the atmospheric temperature in the furnace and increase the heating time of the metal coil 17. Efficiency decreases.

Furthermore, when heating a metal coil with a hot air stream, the thermal conductivity of the metal coil differs depending on whether the hot air stream is in the direction of the coil axis or in a direction that crosses the coil axis. In the case of the conventional annealing method in which the flow direction of the hot air changes, uneven temperature rise occurs in each part of the metal coil, which reduces the uniformity of annealing.

[Purpose and structure of the invention]

It is an object of this invention 1 to provide a metal coil annealing apparatus that can advantageously solve the above-mentioned problems, and the gist of this invention is to provide a furnace body 1 and a coil housing provided therein. An outer flow path 3 and an inner flow path 4 are provided between the coil storage chamber 2 and the left and right side walls 5 of the coil storage chamber 2. Hot air supply tube 7 with opposing hot air outlets
The inlet of the hot air supply tube 7 is opened to the outer flow path 3, and a plurality of hot air ventilation holes 8 are provided in the side wall 5 around the hot air supply tube 7, and the inlet of the hot air supply tube 7 is opened to the outer flow path 3. The rotary blade 1 of a circulation fan 10 that sends hot air from inside the inner flow path 4 to the outer flow path 3 is connected to the opening 9 connecting the upper part of the fan 4.
1 is disposed, and a heater 12 is disposed within the outer flow path 3.

〔Example〕 " Next, the present invention will be explained in detail using illustrated examples.

1 to 4 show an embodiment of the present invention, in which a coil storage chamber 2 is provided in a furnace body 1 equipped with a lifting door 19 at the front entrance. 1 and the coil storage chamber 2, an outer flow path 3 and an inner flow path 4 defined by an upper partition plate 20 and a side partition plate 21 are provided, and each has a hot air outlet that expands toward the edge. The movable supply tube 22 is slidably fitted into a fixed supply tube 23 having a hot air inlet that widens toward the edge to form a hot air supply tube 7, and a pair of left and right hot air supply tubes configured in this manner 7 are arranged at intervals in the left-right direction, and are arranged so that the center line of each hot air supply cylinder 7 is located on a straight line extending in the left-right direction.

A covering cylinder 24 is fixed across openings provided in the left and right side walls 5 of the coil storage chamber 2 and openings provided in the left and right side partition plates 21, and the covering cylinder 2
The hot air supply tube 7 is inserted into the hot air supply tube 7 , and the suction end of the fixed supply tube 23 in the hot air supply tube 7 is fixed to the end of the covering tube 24 in an airtight manner, and the hot air is inserted into the fixed supply tube 23 . A spiral wing 25 for turning is fixed,
Further, one end of the movable operating rod 26 disposed on the center line of the hot air supply cylinder 7 and the movable supply cylinder 22 are connected via a connecting arm 27 extending in the diametrical direction of the movable supply cylinder 22. The other end of the moving operating rod 26 is connected to a piston rod of a moving hydraulic cylinder 28, and both ends of the hydraulic cylinder 28 are connected to a switching/cutting solenoid valve 29.
It is connected to a hydraulic unit (not shown) via.

A plurality of (for example, four or more) hot air ventilation holes 8 are provided in the left and right side walls 5 of the coil storage chamber 2 at intervals in the circumferential direction of the covering tube 24, and the hot air vents 8 are provided in the left and right sides of the upper partition plate 20. An opening 9 connecting the upper portions of the outer flow path 3 and the inner flow path 4 is provided in the center, and the main body of the circulation fan 10 that sends hot air from the inner flow path 4 to the outer flow path 3 is connected to the furnace main body. Further, the rotating blades 11 of the circulation fan 10 are arranged in the opening 9, and heaters 12 consisting of planar U-shaped heat transfer tubes are installed on both left and right sides of the upper part of the outer flow path 3. is arranged, both ends of the heat exchanger tube are arranged outside the furnace, and a burner is connected to one end of the heat exchanger tube.

Air volume adjustment dampers 3 are provided on the upper left and right sides of the outer flow path 3.
0 is provided, and dampers 31 for adjusting air volume are provided on both left and right sides of the upper part of the inner flow path 4, and a metal coil 6 such as an aluminum coil wound around a spool 32 has a coil axis (
The coil center line) is placed on a tray 18 such that it extends in the left-right direction, and the tray 18 is placed on tray holders 33 provided on both left and right sides of the lower part of the coil storage chamber 2.

A hot air ventilation hole 35 is provided in a disk 34 fixed to both ends of the spool 32, and the metal coil 6 is disposed between the left and right hot air supply tubes 7 in the coil storage chamber 2. 6 is arranged so that the center line of the hot air supply tube 7 is located on or near the center extension line of the hot air supply tube 7, and furthermore, at the lower part of the coil storage chamber 2, there are a pair of left and right coils extending in the front and back direction inside the tray holder 33. The furnace rail 36 is fixed.

A plurality of spacers 37 are fixed around the hot air outlet of the hot air supply tube 7 to form a hot air passage gap between the edge of the hot air outlet and the end face of the metal coil 6, and the coil is attached to the spacer 37. An end surface contact detection sensor 38 is attached, and a detection signal from the sensor 38 causes the switching and blocking solenoid valve 29 to be switched to the flow path blocking position.

A pair of traversing rails 39 extending in the left-right direction are laid on the floor at the front of the metal coil annealing equipment, and a pair of traversing rails 39 extending in the front-rear direction are installed on the upper part of the traversing truck 40 that runs along the traversing rails 39. A charging truck rail 41 is fixed at the same interval and at the same level as the furnace rail 36, and a charging truck 42 that runs along the charging truck rail 41 and the furnace rail 36 is provided with a tray 18. An elevating support table 43 is provided which can be placed up and down freely.

When annealing a metal coil such as an aluminum coil using the metal coil annealing apparatus of the above embodiment, the hydraulic cylinder 28 is shortened in advance to retreat the movable supply cylinder 22, and the elevator door 19 is raised. After opening the entrance/exit at the front of the furnace body 1, arranging the charging truck rail 41 so as to be lined up in series with the furnace rail 36, and then driving the charging truck 42 into the coil storage chamber 2, The tray 18 on which the metal coil 6 is placed is moved down the lifting support stand 43 to the tray holder 33.
The metal coil 6 is placed approximately concentrically between the left and right hot air supply tubes 7, and the charging truck 42 is run on the charging truck rail 41.

Next, the switching/cutting electromagnetic valve 29 is switched in the hydraulic cylinder extension direction to extend the hydraulic cylinder 28 and move the movable supply cylinder 22 with the spacer 37 forward toward the end surface of the metal coil 6.

In this way, when the spacer 37 and the coil end face contact detection sensor 38 abut against the end face of the metal coil 6, the switching and cutoff solenoid valve 29 is moved to the flow path cutoff position by the detection signal of the coil end face contact detection sensor 38. As a result, the extension operation of the hydraulic cylinder 28 is stopped.

Next, with the lift door 19 lowered and the entrance/exit of the furnace body 1 closed, nitrogen gas or other inert atmosphere gas is injected into the furnace from a gas supply pipe (not shown), and the inside of the furnace is The air is discharged, and then the atmospheric gas in the furnace is heated by the heater 12, and the circulation fan 10 is operated to circulate the heated atmospheric gas in the direction of the arrow in FIG.

That is, the atmospheric gas heated in the outer flow path 3 is allowed to enter the hot air supply cylinder 7, and is swirled by the swirling spiral blades 25 in the hot air supply cylinder 7 to form a swirling flow, and then the swirling flow is After blowing the hot air from the hot air outlet of the hot air supply tube 7 onto the end face of the metal coil 6, the blown atmospheric gas is caused to flow out from the hot air vent 8 of the side wall 5 into the inner flow path 4,
Subsequently, it is made to flow out from the opening 9 to the upper part of the inner flow path 4 and circulated.

After the metal coil 6 is heated and annealed for a predetermined period of time in this manner, the switching/cutting solenoid valve 29 is switched to the hydraulic cylinder shortening direction to shorten the hydraulic cylinder 28 and move the movable supply cylinder 22 is moved away from the end face of the metal coil 6, and then the entrance/exit of the furnace body 1 is opened, the charging cart 42 is moved into the coil storage chamber 2, and then the lifting support table 43 is raised to remove the metal coil 6. After supporting the tray 18 on which the tray 18 is placed, the charging truck 42 is run on the charging truck rail 41.

When carrying out this invention, a plurality of metal coils 6 are arranged in the coil storage chamber 2 at intervals in the front-rear direction, and
A plurality of hot air supply cylinders 7 may be provided on both the left and right sides of the coil storage chamber 2, respectively, so that a plurality of metal coils 6 may be annealed at the same time.

〔Effect of the invention〕

According to this invention, an outer flow path 3 and an inner flow path 4 are provided between the furnace body 1 and a coil storage chamber 2 provided therein, and side walls 5 on both left and right sides of the coil storage chamber 2 are provided. To,
A hot air supply cylinder 7 having a hot air outlet facing the end face of the metal coil 6 disposed laterally in the coil storage chamber 2 is provided, and the inlet of the hot air supply cylinder 7 is opened to the outer flow path 3.
A plurality of hot air ventilation holes 8 are provided in the side wall 5 around the hot air supply cylinder 7, and an opening 9 connecting the upper portions of the outer flow path 3 and the inner flow path 4 is provided with a plurality of hot air ventilation holes 8 from inside the inner flow path 4 to the outer flow path. 3
Since the rotary blades 11 of the circulation fan 10 that sends hot air inside are arranged, and the heater 12 is arranged inside the outer flow path 3, the atmospheric gas heated by the heater 12 inside the outer flow path 3 is After blowing hot air from the hot air outlets of the left and right hot air supply cylinders 7 onto both end surfaces of the metal coil 6, it can be circulated through the inner flow path 4 into the outer flow path 3, thereby heating the metal coil 6 uniformly. As a result, the effect of uniformly annealing the metal coil 6 with high efficiency is obtained.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a vertical sectional front view of a metal coil annealing device, and FIG. 2 is a vertical sectional view showing an enlarged part of FIG. 1. 3 is a partially longitudinal side view showing the relationship between the metal coil annealing device and the metal coil conveying device, and FIG. 4 is a longitudinal sectional front view showing the flow of atmospheric gas in the metal coil annealing device. FIG. 5 is a schematic cross-sectional front view showing a conventional metal coil annealing apparatus, and FIG. 6 is a vertical cross-sectional side view thereof. In the figure, 1 is the furnace body, 2 is the coil storage chamber, 3 is the outer flow path, 4 is the inner flow path, 5 is the side wall, 6 is the metal coil, 7 is the hot air supply tube, 8 is the hot air vent, and 9 is the opening. 10 is a circulation fan, 11 is a rotary blade, 12 is a heater, 18 is a tray, 19 is a lift door, 20 is an upper partition plate, 21 is a side partition plate, 22 is a movable supply cylinder, 23 is a fixed supply 24 is a covering tube, 25 is a spiral blade for turning, 26 is a moving operating rod, 27 is a connecting arm, 28 is a moving hydraulic cylinder, 29 is a switching and shutting solenoid valve, 30 and 31 are dampers for adjusting air volume, 33 is a tray pedestal, 36 is a furnace rail, 37 is a spacer, 38 is a coil end surface contact detection sensor, 40 is a traversing truck, 41 is a rail for a charging truck, 42 is a charging truck, and 43 is a lifting support table. be.

Claims (1)

[Claims] An outer flow path 3 and an inner flow path 4 are provided between the furnace body 1 and a coil storage chamber 2 provided therein. A hot air supply cylinder 7 having a hot air outlet facing the end face of the metal coil 6 arranged horizontally is provided, the inlet of the hot air supply cylinder 7 is opened to the outer flow path 3, and the hot air supply cylinder 7 is provided on the side wall 5. A plurality of hot air ventilation holes 8 are provided around the periphery, and an opening 9 connecting the upper portions of the outer flow path 3 and the inner flow path 4 is used for circulating hot air from inside the inner flow path 4 into the outer flow path 3. A metal coil annealing apparatus characterized in that a rotating blade 11 of a fan 10 is disposed, and a heater 12 is disposed within the outer flow path 3.