JP2014227571A - Bell jar-type continuous heat treatment furnace for spheroidizing annealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bell jar-type continuous heat treatment furnace for spheroidizing annealing.SOLUTION: The bell jar-type continuous heat treatment furnace for spheroidizing annealing includes a first and a second heating chambers, an annealing chamber, a first and a second temperature lowering chambers, a plurality of carriages, and a first and a second heat recovery mechanisms. Provided are: a first and a second gates on both end sides of the first and the second heating chambers, respectively; a heating unit on both upper end sides of the first and the second heating chambers; a third gate adjacent to the annealing chamber, a heating unit on the upper side of the annealing chamber; a fourth gate adjacent to the first temperature lowering chamber; the first heat recovery mechanism on the upper side of the first temperature lowering chamber; a fifth gate adjacent to the second temperature lowering chamber; a sixth gate on the other end of the second temperature lowering chamber; the second heat recovery mechanism on the upper side of the second temperature lowering chamber; an air intake hole, an air supply hole, and a temperature detector on the carriage; and a support mechanism for supporting the carriage upward on both end sides of the carriage. A disk-shaped steel material is placed on the carriage, and a bell jar is then mounted.

Description

 The present invention relates to a structure of a bell jar type spheroidizing annealing continuous heat treatment furnace, and more particularly to a structure using a carriage, covering a disk member with a bell jar, and then putting into an annealing furnace to continuously perform an annealing process.

  The purpose of annealing the steel is mainly to adapt the steel to the subsequent cold forging, and the main reason for affecting the processing is that the reticulated cementite in the steel needs to be spheroidized. Cementite is heated several times to 680 ° C. after being heated to 720 ° C. several times. In the slow cooling process, reticulated cementite can be spheroidized for the first time, but this step needs to be repeated many times. Only then, cementite can be uniformly spheroidized, and the annealing furnace structure currently used most in the industry has a relatively large volume in the furnace, which consumes a relatively large volume of protective gas before heat treatment. When the inside temperature falls, the amount of heat cannot be recycled and the energy saving carbon dioxide reduction effect cannot be achieved. And pressurized, energy saving in the various places in the world where the carbon dioxide reduction is required, this structure, there is a need for improvement.

  Conventionally, as a method and an apparatus for manufacturing a specific product by annealing a steel material in a heat treatment furnace, there is one disclosed in Patent Document 1, for example.

JP 2010-280050 A

  An object of the present invention is to provide a structure of a bell jar type spheroidizing annealing continuous heat treatment furnace capable of performing an annealing process in a trolley of a disk steel material and simultaneously achieving speediness and energy saving by the structure of a bell jar type bogie. There is.

  In order to achieve the above object, the structure of the bell jar type spheroidizing annealing continuous heat treatment furnace provided by the present invention includes a first heating chamber, a second heating chamber, an annealing chamber, a first cooling chamber, and a second cooling temperature. And a first heat recovery mechanism and a second heat recovery mechanism, wherein a first gate is provided on one end side of the first heating chamber, and the first gate is opened and closed automatically. Can be controlled to open or close upward. Both upper end sides of the first heating chamber are provided with a heating unit, a second gate is provided on the side adjacent to the second heating chamber, and the second gate is automatically It can be controlled to open or close upward by receiving control opening and closing, both upper end sides in the second heating chamber are provided with a heating unit, a third gate is provided on the side adjacent to the annealing chamber, and a plurality of upper sides in the annealing chamber are provided. A heating unit is provided for annealing. A fourth gate is provided on a side adjacent to the first descending chamber, and the fourth gate can be controlled to open or close upward by receiving automatic control opening and closing, and a heat recovery mechanism is provided above the first descending chamber, A fifth gate is provided on the side of the descending greenhouse adjacent to the second descending greenhouse, a sixth gate is provided on the other end of the second descending greenhouse, and the fifth and sixth gates are opened upward by automatic control opening / closing. The closure can be controlled, a heat recovery mechanism is provided above the second descending greenhouse, and the carriage is always a wheel that travels through the rail. The carriage is equipped with an intake hole, an air supply hole, and a temperature detector, and is supported on the end of the carriage. A mechanism is provided, and the support mechanism has a function of raising and supporting the carriage, and on the carriage surface of the carriage, the disk steel material is placed and the bell jar is placed at the same time.

  When performing an annealing process on a truck equipped with a disk steel material, first, the air in the bell jar is sucked up to the vacuum through the suction hole, and then 95% nitrogen gas and 5% hydrogen gas are fed into the bell jar through the air feeding hole. At this time, the cart 60 loaded with disk steel can enter the first heating chamber and be prepared to preheat, and when the gate is closed, the support mechanism on the cart end side raises the entire cart, After forming the sealed space on the first and second gates on both ends of the first heating chamber and the base surface of the carriage, the heating unit directly heats the bell jar.

  When the temperature in the bell jar reaches 250 ° C, the temperature detector in the bell jar issues a message, the gate is opened upward, and the support mechanism on the end of the cart lowers the cart. 2 advance to the heating chamber, perform the second stage preheating, and after the cart enters the second heating chamber, the second gate is closed, and the support mechanism on the cart end side raises the entire cart, and the second heating chamber After forming one sealed space on the second and third gates on both ends and the base of the carriage, the heating unit directly heats the bell jar, and the gate is opened upward simultaneously with the heating. When one second carriage enters the first heating chamber and performs preheating, when the temperature in the bell jar of the second heating chamber reaches 500 ° C., the third gate is opened upward, and the first first carriage Back into the annealing chamber When the third gate is closed at the same time, the support mechanism on the second cart end raises the entire cart, the first and second gates are opened and closed in sequence, and the following cart is heated first. And the second heating chamber can be preheated and after the carriage in the annealing chamber completes the annealing, the fourth gate is opened, the carriage in the annealing chamber enters the first descending greenhouse, After the temperature is lowered in stages and the gate is closed, the support mechanism on the trolley end raises the entire trolley and supports the fourth and fifth gates. At the same time, the first heat recovery mechanism above the first temperature drop chamber The excess thermal energy in the first descending greenhouse is recovered in the second heating chamber, the expenditure of thermal energy in the second heating chamber is reduced, the recovery of thermal energy is achieved, and the temperature in the bell jar of the first descending greenhouse is When down to 500 ° C, The trolley in the first descending greenhouse is advanced to the second descending chamber, the temperature is lowered in the second stage, and after the gate is closed, the support mechanism on the end of the cart raises the entire cart, And the second heat recovery mechanism above the second descending greenhouse collects the remaining thermal energy in the second descending greenhouse into the first heating chamber, and the thermal energy of the first heating chamber is supported. When the temperature in the bell jar of the second descending greenhouse drops to 250 ° C, the sixth gate is opened and the cart in the second descending greenhouse is lowered to the second temperature. Separate the chamber and complete the annealing process.

  According to the structure of the bell jar type spheroidizing annealing continuous heat treatment furnace of the present invention, the structure of the bell jar type trolley performs an annealing process in the trolley of the disk steel material, and at the same time achieves quickness and energy saving.

It is a front structural drawing of the structure of the bell jar type spheroidizing annealing continuous heat treatment furnace of one example of the present invention. It is a local front view in the Example of FIG. It is a local operation | movement figure in the Example of FIG. FIG. 2 is a front structural view of an annealing chamber in the embodiment of FIG. 1. FIG. 5 is a local sectional view taken along line AA in FIG. 4. It is a graph showing the temperature change with respect to time in the bell jar in the Example of FIG. It is operation | movement explanatory drawing in the structure of the bell jar type spheroidizing annealing continuous heat treatment furnace of one Example of this invention. It is operation | movement explanatory drawing in the structure of the bell jar type spheroidizing annealing continuous heat treatment furnace of one Example of this invention.

  Embodiments of the present invention will be described below in detail with reference to the drawings. The drawings are simplified illustrations and only schematically illustrate the basic method of the present invention. Accordingly, in the figures, only the steps associated with the present invention are shown and the described steps are not intended to imply numbers, shapes, dimensional ratios, etc. when implemented.

  Reference is made to FIG. 1, which is a plan structural view of the present invention. The present invention is a structure of a bell jar type spheroidizing annealing continuous heat treatment furnace, the first heating chamber 10, the second heating chamber 20, the annealing chamber 30, the first descending greenhouse 40, the second descending greenhouse 50, Including a plurality of carriages 60, a first heat recovery mechanism 70, and a second heat recovery mechanism 80, of which a first gate 11 is provided on one end side of the first heating chamber 10, and the first gate 11 is Opening and closing can be controlled by receiving automatic control opening and closing, and the heating unit 12 is provided on both upper ends of the first heating chamber 10, and the second gate 21 is provided on the side adjacent to the second heating chamber 20. The second gate 21 can be controlled to open or close upward by receiving an automatic control opening and closing, and a heating unit 22 is provided on both upper ends of the second heating chamber 20 and is adjacent to the annealing chamber 30. A third gate 31 is provided on the side, A plurality of heating units 32 are provided in the upper part of the annealing chamber 30, and a fourth gate 41 is provided on the side of the annealing chamber adjacent to the first descending chamber 40. The closing can be controlled, the first heat recovery mechanism 70 is provided above the first descending greenhouse, the fifth gate 51 is provided on the side of the first descending greenhouse adjacent to the second descending greenhouse 50, and the other end of the second descending greenhouse 50 is provided. The sixth gate 52 is provided on the side, the fifth gate 51, the sixth gate 52 can be controlled to open or close upward by receiving automatic control opening and closing, the second heat recovery mechanism 80 is provided above the second descending greenhouse 50, The carriage 60 is a wheel that always travels through a rail. The intake hole 61, the air supply hole 62, and the temperature detector 63 are provided on the carriage 60, and the support mechanism 64 is provided on the end side of the carriage. Has the function of raising and supporting 60 upwards, In the 60 of the platform surface, to enshrine disc steel 65, mounting the bell jar 66 at the same time.

  As shown in FIGS. 2 and 3, when performing an annealing process on the carriage 60 on which the disk steel material 65 is mounted, first, the air in the bell jar 66 is sucked up to the vacuum through the intake hole 61, and then an oxygen-free environment is given to the bell jar 66. The disk steel material 65 of the bell jar 66 is not decarburized in the annealing process, and 95% nitrogen gas and 5% hydrogen gas are sent into the bell jar 66 through the air feed holes 62, and the mixed nitrogen and hydrogen Can provide a reducing gas and a protective atmosphere. At this time, the carriage 60 on which the disc steel material 65 is mounted can enter the first heating chamber 10 and be prepared for preheating. When the first gate 11 is closed, the carriage The cylinder in the support mechanism 64 at both ends of the 60 raises the entire carriage 60, and the cylinder in the support mechanism in the present invention can be a pneumatic cylinder or a hydraulic cylinder. After forming the closed space to the base surface of the heat chamber 10 at both ends of the first gate 11 and second gate 21 and carriage 60, the heating unit 12 to the bell jar 66, heat directly.

  When the temperature in the bell jar 66 reaches 250 ° C., the temperature detector 63 in the bell jar 66 issues a message, opens the second gate 21 upward, and the support mechanisms 64 on both ends of the cart 60 lower the cart 60. The carriage 60 is advanced to the second heating chamber 20 by using the rail, the second stage of preheating is performed, and after the carriage 60 enters the second heating chamber 20, the second gate 21 is closed and both ends of the carriage 60 are closed. The side support mechanism 64 raises the entire carriage 60 to form one sealed space on the second gate 21 and third gate 31 and the carriage 60 on both ends of the second heating chamber 20. The bell jar 66 is directly heated by the heating unit 22 of the chamber 20, and simultaneously with the heating, the first gate 11 of the first heating chamber 10 is opened upward, and another second carriage 60 is connected to the first heating chamber 10. Enter and preheat When the temperature in the bell jar 66 of the second heating chamber reaches 500 ° C., the temperature detector 63 of the bell jar 66 issues a message, the third gate 31 is opened upward, and the first first cart 60 is annealed. The support mechanism 64 on both ends of the second carriage 60 raises the entire carriage 60 at the same time when the third gate 31 is closed at the same time to enter the chamber and perform the annealing process, and at the same time, the heating unit in the annealing chamber 30 32 directly heats the bell jar 66 again to perform an annealing process.

  4, 5, and 6, when performing the annealing process, the heating unit 32 in the annealing chamber 30 heats the disk steel 65 in the bell jar 66 to 720 ° C., and then detects the temperature detector in the bell jar 66. 63 issues a message, and the support mechanism 64 on both ends of the carriage 60 lowers the carriage 60. Then, the carriage 60 enters the slow cooling region 33, and the surroundings of the slow cooling region 33 are made of a heat insulating material. The heat energy generated by the heat pump 32 can be efficiently isolated, the disk steel 65 in the bell jar 66 is gradually cooled, the temperature is lowered to 680 ° C., the above process is repeated three times, and then the temperature detector 63 in the bell jar 66 displays a message. , The fourth gate 41 is opened, the carriage 60 that has completed the annealing process in the annealing chamber is separated from the annealing chamber 30, and the inside of the bell jar 66 At the same time that the disk steel material 65 performs the annealing process, the second gate 21 and the first gate 11 are sequentially opened and closed, and the subsequent third and second carriages 60 are connected to the second heating chamber 20 and the first heating chamber 10. Can be preheated.

  Referring to FIGS. 7 and 8, the cart 60 enters the first descending greenhouse 40, performs the first stage temperature drop, and after the fourth gate 41 is closed, the support mechanisms 64 on both ends of the cart 60 are moved to the cart 60. While raising the whole, the 4th gate 41 and the 5th gate 51 are supported, and the 1st heat recovery mechanism 70 above the 1st descending room 40 is the 2nd heating chamber. 20 when the temperature in the bell jar 66 of the first descending greenhouse drops to 500 ° C., reducing the heat energy expenditure in the second heating chamber 20 and achieving the heat energy recovery. The detector 63 issues a message, the fifth gate 51 is opened, the first carriage 60 in the first descending greenhouse 40 is advanced to the second descending chamber 50, the temperature is lowered in the second stage, and the fifth gate 51 is closed. The support mechanism 64 on both ends of the first cart 60 is a platform. 60, the fifth gate 51 and the sixth gate 52 are supported, and the second heat recovery mechanism 80 above the second descending greenhouse 50 is activated at the same time, and the excess heat energy in the second descending greenhouse 50 is When the temperature in the bell jar 66 of the second descending greenhouse 50 is finally lowered to 250 ° C., the heat energy is recovered in the first heating chamber 10 to reduce the expenditure of heat energy in the first heating chamber 10 to achieve the heat energy recovery. Then, the temperature detector 63 in the bell jar 66 issues a message, the sixth gate 52 is opened, the carriage 60 in the second descending greenhouse 50 is separated from the second descending greenhouse 50, and the annealing process is completed.

 In the present invention, the preferred embodiments have been disclosed as described above, but these are not intended to limit the present invention in any way, and anyone who is familiar with the technology can make an equivalent scope without departing from the spirit and scope of the present invention. Of course, various changes and applications can be added.

DESCRIPTION OF SYMBOLS 10 1st heating chamber 11 1st gate 12 Heating unit 20 2nd heating chamber 21 2nd gate 22 Heating unit 30 Annealing chamber 31 3rd gate 32 Heating unit 33 Slow cooling area 40 1st descending room 41 4th gate 50 2nd Greenhouse 51 Fifth gate 52 Sixth gate 60 Bogie 61 Air intake hole 62 Air supply hole 63 Temperature detector 64 Support mechanism 65 Disk steel 66 Bell jar 70 First heat recovery mechanism 80 Second heat recovery mechanism

In order to achieve the above-mentioned object, the structure of the bell jar type spheroidizing annealing continuous heat treatment furnace of one aspect of the present invention includes a first heating chamber, a second heating chamber, an annealing chamber, a first descending greenhouse, and a second heating chamber. Including a descending greenhouse, a plurality of carts, a first heat recovery mechanism, and a second heat recovery mechanism, of which a first gate is provided at one end of the first heating chamber, and the first gate is opened upward. or can control the closure, the upper ends of the first heating chamber are each provided with a heating unit, a second gate provided on the side adjacent to the second heating chamber, second gate, top-facing open or closed A heating unit is provided on both upper ends of the second heating chamber, a third gate is provided on the side adjacent to the annealing chamber, and the third gate can be controlled to open or close upward. , a plurality of heating units in the annealing chamber upwardly, a A fourth gate provided on the side adjacent to the first cooling chamber-ring chamber, said fourth gate may control the upward opening or closing, the first heat recovery mechanism is provided in the first cooling chamber upward, the second descending greenhouse A fifth gate is provided on the side adjacent to the second greenhouse, a sixth gate is provided on the other end of the second descending greenhouse, and the fifth and sixth gates can be controlled to open or close upward, and the second gate is located above the second descending greenhouse . A heat recovery mechanism is provided, and the carriage is a wheel that always travels through the rail, an intake hole, an air supply hole, and a temperature detector are provided on the carriage, a support mechanism is provided at the end of the carriage, and the support mechanism It has a function of raising and supporting upward, and on the base surface of the carriage, when the disc steel material is placed at the same time, the bell jar is placed at the same time, and the support mechanism raises the carriage, two adjacent ones of the first to sixth gates Gate (except for the combination of 3rd and 4th gate) and stand A sealed space is formed between the base of the car.

Claims (3)

 Including a first heating chamber, a second heating chamber, an annealing chamber, a first descending greenhouse, a second descending greenhouse, a plurality of carts, a first heat recovery mechanism, and a second heat recovery mechanism, Among them, a first gate is provided on one end side of the first heating chamber, the first gate can be controlled to open or close upward, and heating units are provided on both upper ends of the first heating chamber. A second gate is provided on the side adjacent to the heating chamber, the second gate can be controlled to open or close upward, and a heating unit is provided on each of both upper ends of the second heating chamber, A third gate is provided on the adjacent side, a plurality of heating units are provided above the annealing chamber, a fourth gate is provided on the side adjacent to the first descending chamber in the annealing chamber, and the fourth gate is opened or closed upward. The first heat recovery mechanism is installed above the first descending greenhouse. The fifth gate is provided on the side adjacent to the second descending chamber, the sixth gate is provided on the other end of the second descending chamber, and the fifth and sixth gates can be controlled to open or close upward, A second heat recovery mechanism is provided above the second descending greenhouse of the room, and the carriage is a wheel that always travels through the rail, and an intake hole, an air supply hole, and a temperature detector are provided on the carriage, and a support mechanism is provided at the end of the carriage. The support mechanism has a function of raising and supporting the carriage upward, and the disk steel material is placed on the carriage surface of the carriage, and the bell jar is placed at the same time. Construction.  The structure of the bell jar type spheroidizing annealing continuous heat treatment furnace according to claim 1, wherein the cylinder in the support mechanism is a hydraulic cylinder or a pneumatic cylinder.  The first gate of the first heating chamber, the second gate of the second heating chamber, the third gate of the annealing chamber, the fourth gate of the first descending chamber, the fifth gate and the sixth gate of the second descending chamber are automatically The structure of the bell jar type spheroidizing annealing continuous heat treatment furnace according to claim 1, wherein upward opening or closing is controlled by controlled opening and closing.

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