KR20050062032A - Continuation type environment annealing equipment - Google Patents

Abstract

The present invention relates to a continuous atmosphere heat treatment apparatus, wherein a workpiece to be transported by a mesh conveyor is preheated while passing through a preheating tube having a preheating heater provided with a reciprocating bogie, and then a heating heater connected to the rear of the preheating tube. Atmospheric heat treatment while passing through the core tube to the atmosphere having, and subsequently cooled while passing through the cooling tube connected to the rear of the core tube, and discharged in the continuous atmosphere heat treatment apparatus discharged, the upper and lower sides of the core core tube to the atmosphere A plurality of pockets protruding from one another at equal intervals along the longitudinal direction and made of the same material as the core tube; And a thermocouple having a metal cover that is inserted into the pocket through the atmosphere furnace and is in contact with one side of the core tube and the inner surface of the pocket to directly measure the upper and lower temperatures of the core tube. As the thermocouple is closely adhered to the surface of the core tube, the upper and lower temperatures of the core tube can be directly measured, and thus the temperature change of the core tube can be accurately measured.

Description

Continuous Atmosphere Heat Treatment Equipment {CONTINUATION TYPE ENVIRONMENT ANNEALING EQUIPMENT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat treatment apparatus for atmospherically treating a metal workpiece, and relates to a continuous atmosphere heat treatment apparatus in which a preheating portion, an atmosphere furnace, and a cooling portion are integrally connected.

In general, the continuous atmosphere heat treatment apparatus is capable of performing an atmosphere heat treatment of a metallic material to be treated as a gas such as hydrogen, nitrogen, argon, etc. forms an atmosphere inside a core tube embedded in an atmosphere furnace.

FIG. 1 is a side view illustrating the general continuous atmosphere heat treatment apparatus, and FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1 showing the structure of the atmosphere.

As shown in the drawing, the continuous atmosphere heat treatment apparatus includes an input part 10, a preheating part 20, a heat treatment part 30, a cooling part 40, a discharge part 50, and a driving motor M sequentially connected sequentially. The mesh conveyor (C) is circulated from the input unit 10 to the discharge unit 50 by the driving of.

Of course, the heat treatment object not shown is introduced into the mesh conveyor (C) from the input unit 10, by the circulating mesh conveyor (C) preheating unit 20, the heat treatment unit 30 and the cooling unit ( Heated and cooled while passing through 40 is discharged to the discharge unit (50).

Here, the input unit 10 and the discharge unit 50 is composed of an input plate 2 and the discharge plate 52 for loading the object to be processed, the preheating unit 20 is shown in FIG. It consists of the preheating tube 22 which has the preheating heater H, and the trolley | bogie 24 for horizontal movement which has a caster provided in the lower part of the preheating tube 22. As shown in FIG.

1 and 2, the heat treatment unit 30 has a core core 34 of a heat resistant steel having a gas supply tube 34a for supplying an atmosphere gas to an inner circumferential surface thereof, and a core core 34 It consists of the atmosphere furnace 32 provided with the thermocouple 35 which has the heating heater 33 which heats the heat exchanger, and has the ceramic pipe 35a which measures the upper and lower temperature of the furnace core pipe 34. As shown in FIG.

At this time, the atmosphere furnace 32 is made of a refractory insulating material such as ceramic or special cement to insulate and insulate the core core 34, the core core 34 is a top plate of a metal material placed on the refractory insulating material as shown It is seated at 32a.

The metal reinforcing plate 32b for supporting the lower surface of the core tube 34 is interposed between the lower surface of the core tube 34 and the upper surface of the roof plate 32a on both sides.

Therefore, the thermocouple 35 is inserted vertically through the upper and lower portions of the atmosphere furnace 32 as shown in FIG. 2 so that the upper and lower temperatures of the low core tube 34 can be measured.

On the other hand, the cooling unit 40 is composed of a cooling tube 42 through which the to-be-processed object passes, and the outer side of the cooling tube 42 has a water jacket (not shown) for dissipating cold air to the to-be-processed object. It is desirable to install.

In the general continuous atmosphere heat treatment apparatus configured as described above, when the heating heater 33 heats the core tube 34 for the atmospheric heat treatment of the workpiece, the core tube 34 is thermally expanded by this heat and has a long axis direction, that is, a longitudinal direction. Especially as it increases.

Then, the preheating tube 22 is pushed by the expanded core tube 34 to horizontally move forward with the trolley 24 to compensate for the thermal expansion of the core tube 34.

At this time, only the preheating pipe 22 is pushed forward, and the cooling pipe 42 connected to the rear side of the core core 34 is not pushed backward.

This is because the cooling tube 42 is much longer than the preheating tube 22, as shown in FIG.

In more detail, because the cooling tube 42 has a heavier weight than the preheating tube 22 along its length, the cooling tube 42 is not supported and pushed to its own weight when the core tube 34 is expanded.

Therefore, since the core tube 34 must expand to the opposite side of the cooling tube 42, only the preheating tube 22 is pushed.

However, in the general continuous atmosphere heat treatment apparatus configured as described above, the thermocouple 35 must be installed through the upper part of the atmosphere furnace 32, so that the installation worker must move up to the upper portion of the atmosphere furnace 32 or enter the lower portion thereof. There is difficulty in installation.

In addition, as the thermocouple 35 is integrally inserted into the brittle ceramic cover 35a as shown in FIG. 2, the operator must install the thermocouple 35 so that the ceramic cover 35a is not damaged. There is also difficulty.

In addition, since the ceramic cover 35a comes into contact with the metal core core 34 and the plate top plate 32a when the thermocouple 35 is installed, the ceramic thermocouple 35 is broken into the core tube 34 and the plate top plate. In addition to the installation difficulty that must be spaced apart from the surface of (32a) by a small distance (L), the installation time is excessively consumed due to this difficulty.

In addition, since the thermocouples 35 are spaced apart from each other, the thermocouples 35 do not directly measure the surface temperature of the low core tube 34, but measure the space temperature of the space around the low core tube 34. As a deviation occurs between the temperature measured at 35 and the actual temperature of the core tube 34, there is a problem in that the atmosphere temperature inside the core tube 34 cannot be properly adjusted.

In addition, since the temperature of the core tube 34 cannot be directly measured, even if a temperature deviation occurs in the upper and lower sides of the core tube 34, the core tube 34 can be corrected due to a temperature deviation. There is also a problem that the lifespan is shortened by little deformation in this involuntary way (不知 不 識 間).

Finally, since the preheating tube 22 horizontally moved by the trolley 24 is passively moved by the expansion force of the core core 34, the preheating tube 22 is moved due to its own weight when the core tube 34 is expanded. There is also a problem that acts as an element that inhibits expansion of the core tube 34.

That is, when the core tube 34 overcomes the repulsive force due to the weight of the preheat tube 22, the preheat tube 22 starts to move from there, but the preheat tube 22 overcomes the repulsive force. Until it acts as a swelling inhibitor of the core tube 34.

Therefore, the core tube 34 is inflated until it overcomes the repulsive force of the preheating tube 22, there is a problem of thermal deformation.

If the thermal strain of the core tube 34 is severely generated, the core tube 34 is buckled while plastically deforming, so that an accident (driving stop) occurs.

Of course, to correct the buckled core tube 34 must be carried out a tremendous repair work, and in extreme cases, the core tube 34 should be discarded.

The present invention was created in order to solve the above-mentioned conventional problems, and the thermocouple can be easily and simply installed on the upper and lower portions of the core tube, and the thermocouple to be installed closely adheres to the surface of the core tube. The purpose of the present invention is to provide a continuous atmosphere heat treatment apparatus that can accurately measure the temperature of the core tube.

In addition, the object of the present invention is to provide a continuous atmosphere heat treatment apparatus capable of actively compensating for the expansion force of the core tube expanding while being heated, thereby preventing the core tube from thermal deformation and buckling.

The continuous atmosphere heat treatment apparatus according to the present invention for achieving the above object is a preheating tube having a preheat heater (H) is provided with a reciprocating trolley 24, the workpiece to be transported by the mesh conveyor (C) After being preheated while passing through 22, the atmosphere is heat-treated while passing through the core core 34 of the atmosphere furnace 32 having the heating heater 33 connected to the rear of the preheating tube 22, followed by In the continuous atmosphere heat treatment apparatus that is cooled while passing through the cooling pipe 42 connected to the rear, and discharged, at the same interval along the longitudinal direction on the upper and lower sides of the core core 34 of the atmosphere furnace (32). A plurality of pockets 340 formed integrally with each other and protruding from the core tube 34; By inserting into the pocket 340 through the atmosphere furnace 32, the upper and lower temperatures of the core tube 34 are adjusted by contacting one side surface of the core tube 34 and the inner surface of the pocket 340. And a thermocoupler 350 having a metallic cover 350a that is measured directly.

And the rod of the one side is fixed to the trolley 24 of the preheating tube 22, the cylinder 200 for horizontally moving the trolley 24 in accordance with the expansion and contraction of the rod; An accumulator (A) for supplying and blocking fluid to the cylinder (200) to operate the rod of the cylinder (200); It is electrically connected to the heating heater 33 and the thermocouple 350 of the accumulator (A) and the heat treatment unit 30, depending on the temperature applied from the heating heater (33) and the thermocouple (350) Controller 500 for controlling the operation of the cumulator (A); characterized in that it further comprises.

Hereinafter, a continuous atmosphere heat treatment apparatus according to the present invention will be described with reference to the accompanying drawings. In the following description, components having the same technical spirit and features as the prior art will be described with the same reference numerals.

FIG. 3 is a side view showing the continuous atmosphere heat treatment apparatus according to the present invention, and FIG. 4 is a cross-sectional view taken along line Y-Y 'of FIG.

As shown in the continuous atmosphere heat treatment apparatus according to the present invention, the input unit 10, the preheating unit 20, the heat treatment unit 30, the cooling unit 40, the discharge unit 50, and sequentially connected sequentially By the driving of the driving motor (M) is divided into a mesh conveyor (C) circulating from the input unit 10 to the discharge unit 50.

Here, the input unit 10 and the discharge unit 50 is composed of an input plate 2 and the discharge plate 52 for loading the object to be processed, the preheating unit 20 is preheated, as shown in FIG. It consists of the preheating tube 22 which has the heater H, and the trolley | bogie 24 which has the caster provided in the lower part of the preheating tube 22, and reciprocates horizontally.

3 and 4, the heat treatment unit 30 heats the core core 34 and the core core 34 of the heat-resistant steel provided with a gas supply pipe 34a for supplying an atmosphere gas to the inner circumferential surface thereof. It consists of the atmosphere furnace 32 which consists of a fireproof heat insulating material provided with the heating heater 33.

In this atmosphere furnace 32, the upper plate 32a of the metal material on which the low core tube 34 rests is horizontally disposed between the lower surface of the low core tube 34 and the upper surface of the upper plate 32a. The reinforcement plate 32b of the metal material which supports the lower surface of the core tube 34 is long interposed in both sides.

At this time, the heat treatment unit 30 is formed protruding integrally at equal intervals along the longitudinal direction from the upper and lower sides of the core core 34 of the atmosphere furnace 32, a plurality of made of the same material as the core core 34 It consists of two pockets (340).

In addition, by being inserted into the pocket 340 of the low core pipe 34 through the upper and lower sides of the atmosphere furnace 32, in contact with one side surface of the low core pipe 34 and the inner surface of the pocket 340, And a thermocoupler 350 having a metal cover 350a for directly measuring the upper and lower temperatures of the core pipe 34.

The metal cover 350a of the thermocoupler 350 is formed of a stainless steel metal having flexibility so that the thermocoupler 350 is inserted along the surface curve of the core tube 34 and inserted into the pocket 340. Preferably, a conventional thermocoupler is suitable as the thermocouple 350 having the flexible metal cover 350a.

Of course, the upper and lower sides of the atmosphere furnace 32 should be inserted into the insertion hole through which the thermocouple 350 is inserted, the pocket 340 can be applied in various ways such as cylindrical or rectangular, unlike shown. .

Accordingly, the thermocouple 350 is inserted into the pocket 340 while being refracted according to its own characteristics, and thus the thermocouple 350 is in contact with the upper and lower surfaces of the core tube 34 and the inner circumferential surface of the pocket 340. In close contact with the surface, it is possible to directly measure the temperature of the core tube 34, unlike the prior art.

On the other hand, the present invention is the rod is stretched and fixed to the trolley 24 of the preheating tube 22, the cylinder 200 for horizontally moving the trolley 24 while stretching the rod; An accumulator A for supplying and blocking fluid to the cylinder 200 so that the rod of the cylinder 200 is operated; It is electrically connected to the heating heater 33 and the thermocouple 350 of the accumulator A and the heat treatment part 30, and according to the operation of the heating heater 33 and the temperature applied by the thermocoupler 350. It further includes a controller 500 for controlling the operation of the cumulator (A).

In other words, the controller 500 is configured to operate the accumulator A and the cylinder 200 according to the temperature of the thermocoupler 350, that is, the temperature of the low core tube 34.

The controller 500 has a display device for an indicator (not shown) in which the temperature of the thermocoupler 350 is manifest, and a solenoid switch (not shown) for applying an operation signal to the accumulator (A).

On the other hand, the cooling unit 40 of the present invention is connected in series with each other, and includes a plurality of cooling pipes 42 through which the object to be passed, and the outer side of the cooling pipe 42 to surround the cooling pipe 42 A cold air generating water jacket is installed.

In the continuous atmosphere heat treatment apparatus according to the present invention configured as described above, the to-be-processed object injected from the input unit 10 passes through the preheating unit 20 by the mesh conveyor C circulated by the driving motor M, It is preheated by the preheating heater H.

Then, the preheated to-be-processed object is formed with an atmosphere gas and is subjected to atmospheric heat treatment while passing through the core tube 34 of the heat treatment part 30 heated by the heating heater 33, and then the cooling tube of the cooling part 40. Cooled at 42 is discharged to the discharge plate 52 of the discharge unit (50).

At this time, when the core tube 34 is heated by the heating heater 33, the pocket 340 is also heated together with the same temperature as the core tube 34, the thermocouple 350 is inserted into the pocket 340 is The temperature of the core tube 34 and the pocket 340 is converted into an electrical signal and applied to the controller 500.

Then, the controller 500 converts the applied electric signal into an analog or digital signal and displays it on the display not shown.

On the other hand, the solenoid switch of the controller 500 is not shown, when the heating heater 33 of the core tube 34 is operated, at the same time to operate in the forward direction while magnetizing by the incoming current to operate the accumulator (A).

Accordingly, the accumulator A gradually contracts the rod of the cylinder 200 to a weak pressure, whereby the rod of the cylinder 200 moves forward of the preheating tube 22 while pulling the bogie 24 (inlet side). Slowly move horizontally.

Therefore, the core tube 34 expanded by the heating heater 33 does not overcome the repulsive force caused by the weight of the preheat tube 22 as in the prior art by the active movement of the preheat tube 22 by the cylinder 200. It can be easily converted.

Such, it is obvious that the controller 500 should operate the accumulator A to correspond to the expansion speed of the core tube 34, and if the controller 500 does not correspond to the expansion speed of the core tube 34, If the accumulator A malfunctions, the connection portion of the preheating tube 22 and the core tube 34 is separated while shearing.

On the other hand, the controller 500 releases the fluid control operation of the accumulator A when the temperature transmitted from the thermocoupler 350 becomes the set temperature of the low core tube 34 (the expansion completion temperature of the low core tube). The rod of 200 stops contracting.

That is, when the controller 500 is heated to a temperature at which the core tube 34 no longer expands, the controller 500 deactivates the accumulator A so that the cylinder 200 no longer pulls the preheat tube 22.

Of course, the accumulator (A) performs the release operation due to the solenoid switch of the controller 500 in which the polarity is reversed by the incoming alternating current and operated in the reverse direction, and the rod of the cylinder 200 is such an accumulator ( By the release operation of A), the load operation of the trolley 24 is stopped due to the no-load state, that is, the force release state.

Therefore, when the expansion of the core tube 34 is completed, the horizontal movement of the front side of the preheating tube 22 by the pulling of the cylinder 200 is also terminated, whereby the core tube 34 is active in the preheating tube 22. Since the expansion force is sufficiently compensated by the movement, the thermal deformation is prevented while expanding by the heating temperature.

In other words, in the prior art, the expanded core tube 34 is thermally deformed due to the passive movement of the preheating tube 22. However, in the present invention, since the preheating tube 22 is actively moved by the cylinder 200, the thermal deformation is performed. Is prevented.

When the expansion of the core tube 34 is completed by heating the heating heater 33 as described above, the core tube 34 forms an atmosphere while maintaining a uniform temperature by the heating heater 33 to form a mesh conveyor (C). The to-be-processed object (preheated by the preheating part) continuously supplied by () is heat-processed continuously to atmosphere.

When the atmospheric heat treatment of the workpiece is finished, the heating heater 33 is turned off and the heating of the core tube 34 is stopped.

At this time, the core tube 34 is restored to its original state while being contracted by the cooling temperature while slow cooling.

Of course, as the core tube 34 is restored to its original state, the preheating tube 22 connected to the core tube 34 is also returned to its original state by the attraction force of the core tube 34, and the balance 24 upon return. Return to the cloud movement smoothly.

The reason why the trolley 24 can perform the rolling motion in this way is that the attraction force of the cylinder 200 is released by the accumulator A as described above.

That is, since the cylinder 200 does not restrain the trolley | bogie 24, the trolley | bogie 24 can return the preheating tube 22 smoothly.

On the other hand, the thermocouple 350 in close contact with the core tube 34 accurately measures the upper and lower temperatures of the core tube 34 until the atmosphere heat treatment of the workpiece is completed, and converts the measured temperature into an electrical signal. To continue to apply to the controller 500.

Then, the controller 500 confirms by comparing the upper and lower temperatures of the low core tube 34 with the input signal, and if a deviation occurs in the upper and lower temperatures of the low core tube 34, the heating heater 33 is operated. Correct the temperature deviation.

Therefore, the core tube 34 can not only maintain a uniform atmosphere temperature, but also prevent deformation due to temperature deviations of the upper and lower sides.

As described above, the continuous atmosphere heat treatment apparatus according to the present invention actively cooperates with the expansion of the core tube 34 in which the cylinder 200 is heated, so that the core tube 34 to be heated is buckled or thermally deformed while expanding. You can prevent it.

In addition, unlike the conventional thermocouple having brittleness, the thermocouple 350 of the present invention is easily inserted into the pocket 340 of the core tube 34 because it is inserted into the metal cover 350a having flexibility without brittleness. Easy to insert

The above embodiment is merely a description of the preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed as appropriate within the scope of the same idea.

Accordingly, the shape and structure of each component shown in the embodiments of the present invention can be modified and carried out, and such modifications are naturally belonging to the appended claims.

In the continuous atmosphere heat treatment apparatus according to the present invention as described above, the thermocouple can be easily inserted into the pockets formed on the upper and lower one side surfaces of the core tube, so that the operator can lift the upper and lower parts of the atmosphere as in the prior art. Since the thermocouple does not need to be installed, the thermocouple can be easily installed, and the installation time can be shortened.

In addition, the thermocouple receives heat from the pocket which is the same as the core tube, so that the temperature of the core tube can be measured in real time directly, allowing immediate response to the temperature deviation of the core tube. In addition to maintaining the ambient temperature, there is also an effect to prevent the deformation of the core core.

In addition, since the cylinder pulls the bore of the preheating tube during thermal expansion of the core, the preheating tube can actively respond to the expansion of the core tube, and the effect of preventing buckling and thermal deformation due to the expansion of the core tube is also prevented. have.

1 is a side view showing a general continuous atmosphere heat treatment apparatus,

FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1;

Figure 3 is a side view showing a continuous atmosphere heat treatment apparatus according to the present invention,

4 is a sectional view taken along the line Y-Y 'shown in FIG.

<Explanation of symbols for the main parts of the drawings>

20: preheating unit 22: preheating tube

24: balance 30: heat treatment unit

32: Into the mood 34: Rosimkan

200: cylinder 340: pocket

350: thermocouple 500: controller

A: Accumulator H: Preheater

Claims (2)

The workpiece to be conveyed by the mesh conveyor C is preheated while passing through the preheating tube 22 having the preheating heater H provided with the reciprocating trolley 24, and then connected to the rear of the preheating tube 22. Continuous heat treatment is carried out while passing through the core tube 34 of the atmosphere furnace 32 having the heating heater 33, and subsequently cooled while passing through the cooling tube 42 connected to the rear of the core tube 34, and then discharged. In the atmosphere atmosphere heat treatment apparatus, A plurality of pockets 340 formed protruding integrally at equal intervals along the longitudinal direction on the upper and lower sides of the core core tube 34 of the atmosphere furnace 32 and made of the same material as the core tube 34; By inserting into the pocket 340 through the atmosphere furnace 32, the upper and lower temperatures of the core tube 34 are adjusted by contacting one side surface of the core tube 34 and the inner surface of the pocket 340. A continuous atmosphere heat treatment apparatus comprising a; a thermocouple (350) having a metal cover (350a) to measure directly. The method of claim 1, A rod on one side of which is fixed to the trolley 24 of the preheating tube 22, and a cylinder 200 for horizontally moving the trolley 24 according to the expansion and contraction of the rod; An accumulator (A) for supplying and blocking fluid to the cylinder (200) to operate the rod of the cylinder (200); It is electrically connected to the heating heater 33 and the thermocouple 350 of the accumulator (A) and the heat treatment unit 30, depending on the temperature applied from the heating heater (33) and the thermocouple (350) Continuous atmosphere heat treatment apparatus further comprises; a controller (500) for controlling the operation of the cumulator (A).