JPS60159586A - Heat recovery type continuous furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous furnace, such as an a-Lahers type, Traybutscher type, or walking beam type, which continuously transports and heats objects to be heated. The aim is to save energy by

In a continuous heat treatment furnace, a heat exchange chamber is provided, and the high-temperature heat object extracted from the heat treatment chamber and the room-temperature heat object to be heat-treated are housed in the heat exchange chamber so that they exchange heat with each other. Accordingly, devices are already known in which the waste heat of the preceding heated object is effectively used to preheat the succeeding heated object, thereby saving energy. However, in conventional energy-saving continuous furnaces of this type, it is necessary to make a U-turn when heating the object at a high temperature in the furnace, or to provide a long duct to carry hot air obtained from the object.

In other words, it is necessary to make a U-turn on the high-temperature heated object that has passed through the heating zone and send it to the heat exchange zone, but changing the direction of the heated object in this way when the temperature is high requires a complicated conversion and conveyance mechanism, which increases equipment costs. In some cases, it is difficult to adopt the duct because it not only increases the height but also causes vibration to the heated object, which may cause damage. On the other hand, installing a long duct causes a lot of heat dissipation, especially when the furnace length is long. There were drawbacks such as undesirable results.

The heat recovery type continuous furnace of the present invention includes a linear continuous heat treatment chamber having a charging port at one end and an extraction port at the other end, and a heat exchange chamber formed to be continuous with the extraction port of the heat treatment chamber. , a heat-retaining cart that reciprocates between the heat exchange chamber and the charging port of the heat exchange chamber, passes the object to be heated through the heat exchange chamber, and transfers the object to high temperature extracted from the heat treatment chamber. By preheating the object to be heated using the exhaust heat and then transferring it to the charging port of the heat treatment chamber on the heat-insulating cart, the temperature of the preheated object to be heated can be prevented from decreasing and the exhaust heat can be used effectively. This is an attempt to eliminate the above-mentioned drawbacks.

An embodiment of the present invention will be described below with reference to the drawings.

The continuous heat treatment chamber 1 has a furnace length of about 30 meters, and 2 indicates a charging door installed at the charging port at one end, and 3 indicates an extraction door installed at the extraction port at the other end. .

Inside the heat treatment chamber 1, a transport roller 4 is provided on the floor, a fan 5 is provided on the ceiling, and radiant tubes 6 serving as a heat source are provided on the floor and ceiling. Purge chambers 7 and 8 are formed in front and rear of the charging door 2, respectively, and the atmospheric gas is replaced in the purge chambers 7 and the heat treatment chamber 1
Inside, the object to be heated C can be annealed without oxidation. The heat exchange chamber 9 contains the alpine heat target material d extracted from the heat treatment chamber 1.
An rttlA-shaped chamber 9a in which is housed and a straight-line chamber 9b in which an object to be heated to be heat-treated is housed are formed adjacent to each other in parallel, and both chambers 9B, 9b are arranged in the upper and lower portions of opposing side walls. A sirocco-type circulation fan is installed in the ceiling of the chamber 9a, and by operating the circulation fan ν, the air or gas in the chamber is communicated with the chamber 9B by a duct 10.11 as shown by the arrow. It is possible to circulate between Qb. ] 3 is a conveying roller that transports the heated object d in the chamber 9a in the direction of the arrow, and 14 is a conveying roller that transports the heated object 1 in the chamber 9b in the direction of the arrow. 1
5.16 is a door provided at the charging port and extraction port of the chamber 9a, 17 is an extraction table, 18.19 is a door provided at the charging port and extraction port of the chamber 9b, and ■ is a charging table.

21. 21 is a rail laid parallel to the heat treatment chamber 1 so as to be continuous from the extraction port of the chamber 9b, n is a heat-insulating cart that can run on the rail, and the heat-insulating cart is a heat-insulating room n surrounded by a heat insulating wall. The wall surface of the insulating room facing W19 and its y-column wall surface are open, and heat-resistant curtains 24a and 24b are provided therein so as to be openable and closable. That is, the curtains 24a and 24b are placed on the upper edge of the opening of the greenhouse n.
At the same time as fixing one side of the
Winding shafts 26a and 26b provided at both ends are respectively supported, and the winding shafts 26a and 26b are connected to each other so as to be rotated by the drive of motors 278 and 27b, and a wire 28a wound around each pulley is supported. , 28a, yb, 28b as curtain 2
4B, tied to both ends of the lower side of 2Ab, the motor 27a,
27b to rotate the pulley in a predetermined direction and wind or unwind the wire, the curtains 24a, 2
4b is rolled up or hanging down as shown by the imaginary line in FIG. In addition, the grave is a power supply conductor installed parallel to the rail 20.20,
The first is a power supply brush provided on the heat-insulating trolley η, and the power obtained from the power supply brush is supplied to the motors 27b for opening and closing the curtains 24a and 24b, as well as the motor (not shown) for driving the heat-insulating trolley η. It is used as a power source for a motor (not shown) that rotates a conveyance roller 31 that supports an object to be heated d in the insulating chamber. 32.3
2 is the front part of N33 of the purge chamber 7 and the rail 21,
．． A rail laid between the terminal ends of 21, the rail clear, 3
A charging platform is provided on the top 2 so as to be movable back and forth. In other words, the charging platform moves the heated items delivered from the heat-insulating trolley to the purge chamber 7, and is surrounded by a heat-insulating wall except for an opening formed on the side facing the heat-insulating trolley. , the object to be heated can enter and exit through the opening 5.

In the heat recovery type continuous furnace configured in this way, the object to be heated a charged into the chamber 9b from the charging table is preheated by receiving exhaust heat from the object to be heated d in the chamber 9a. Next, the heated object a is door 1
9. The curtain 24a is opened and the vehicle is placed in the insulating chamber of the insulating trolley ρ. Then, the heat-insulating truck n runs on the rails 21 and 21 as shown by the arrow, and is brought to face the charging truck, and transfers the object to be heated to the charging truck. The charging cart U
moves as shown by the arrow t so as to face the purge chamber 7, opens the door O, and charges the object to be heated into the purge chamber 7.

Atmosphere gas is replaced in the purge chamber 7, and the sample is sent to the heat treatment chamber 1, where it is heated to a predetermined high temperature and soaked. Further, the heated object is transferred to the chamber 9& through the purge chamber 8, where it radiates heat, and then extracted to the extraction table 17.

As described above, in the present invention, the object to be heated that has passed through the heat exchange chamber is placed on a heat-retaining cart and transferred to the charging port of the heat treatment chamber, so that the object to be heated can be charged into the heat treatment chamber without being cooled. The energy saving effect of preheating using waste heat can be fully demonstrated. Furthermore, there is no need for a complicated structure such as making a U-turn on the object to be heated when the temperature is high, and it can be additionally installed in an existing heat treatment furnace at a relatively low equipment cost, making it very useful for energy saving in existing equipment. It is.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view, and FIG. 2 is a sectional view taken along the line T in FIG. 1. Figure 3 is a sectional view taken along line 11 in Figure 1, and Figure 3 is a cross-sectional view of Figure 2.
It is a sectional view taken along the ff line. l... Continuous heat treatment chamber, 9... Heat exchange chamber, 22...
・-・Thermos trolley, 23... Insulation room, a-d...
Heated object.

Claims (1)

[Claims] A linear continuous heat treatment chamber having a charging port at one end and an extraction port at the other end; It consists of a heat insulating cart that reciprocates between the charging port and the heated object, which passes the heated object through a heat exchange chamber and preheats the heated object using the high temperature waste heat of the heated object extracted from the heat treatment chamber. Furthermore, the heat recovery type continuous furnace is characterized in that the heat recovery type continuous furnace is placed on the heat-retaining trolley and transferred to the charging port of the heat treatment chamber.