JP5465543B2 - Graphitization furnace - Google Patents

Description

  The present invention relates to a graphitization furnace used for graphitizing a calcined carbonaceous molded body (material to be treated) in a manufacturing process of an electric steelmaking graphite electrode, and particularly, a large-scale direct graphitization method (LWG method). The present invention relates to a graphitization furnace suitable for manufacturing graphite electrode materials and the like.

  A graphite electrode for electric steelmaking is usually formed by mixing a mixed raw material of coke powder particles and pitch binder into a cylindrical shape, firing it at a temperature of 1500 ° C. or lower, and then impregnating the obtained material or this with pitch. It is manufactured by recalcining the material at a temperature of 1000 ° C. or lower, and then heating the carbonaceous molded body obtained through the above steps to a high temperature of 2500 to 3000 ° C. by a resistance heating method and graphitizing. Yes.

  The graphitization is performed by the direct graphitization method mentioned above. The refired carbonaceous compacts are inserted in series inside a long graphitization furnace, and the periphery is encapsulated with coke filling for heat retention and oxidation prevention. And in this state, it supplies with electricity through the terminal electrode which contact | abutted the carbonaceous molded object of the terminal, heat-generates a carbonaceous molded object by electrical resistance, raises to about 3000 degreeC, and graphitizes.

  In this direct graphitization method, the contact resistance generated between the butting surfaces of the individual carbonaceous molded bodies may cause local abnormal heat generation that causes product damage and cracks. The pressed carbonaceous compact is pressed in the axial direction with a pusher to reduce and stabilize the contact resistance between the butted surfaces of the carbonaceous compacts (see Patent Document 1 below).

  In addition, there is a method in which pressing by a pusher and adhesion of individual carbonaceous molded bodies are used together, or between the butting surfaces of individual carbonaceous molded bodies and between the carbonaceous molded body at the end and the water-cooled terminal electrode that is in contact with the carbonaceous molded body. A method of interposing a carbonaceous conductive material having a higher electrical specific resistance value than the molded body has also been developed (see Patent Documents 2 and 3 below).

  Further, the carbonaceous compacts are inserted into chambers arranged in two horizontal rows as a group of serially arranged carbonaceous compacts, and the other ends of the two sets of carbonaceous compacts are electrically connected to each other. A graphitization furnace excellent in productivity, equipment space efficiency, and the like has also been developed in which a Yin and Yang terminal electrode is brought into contact with one end of each group of carbonaceous molded body groups.

  In the graphitization furnace in which the carbonaceous compact groups are arranged in parallel and processed together, a carbon block is arranged at the back end of the furnace as a method of electrically connecting each group of carbonaceous compact groups in series. A method is generally employed in which the other ends of the two sets of carbonaceous compacts are pressed against the block, and electrical conduction is relayed by the carbon block.

  In addition, a power supply device for supplying power to a graphitization furnace or the like is disclosed in the following Patent Document 4, and further, an invention related to the furnace body of the graphitization furnace is disclosed in the following Patent Document 5 or the like.

Japanese Examined Patent Publication No. 63-66766 JP-A-5-78111 JP-A-9-227232 JP 2006-12457 A US Pat. No. 5,299,225

  In the group of carbonaceous molded bodies arranged in parallel, the overall axial dimension (length) is shifted due to a difference in thermal expansion during graphitization treatment or a dimensional error of individual carbonaceous molded bodies due to preliminary firing.

  The set lengths of the respective carbonaceous molded body groups can be adjusted to be equal by changing the axial dimension of the conductive material interposed between the butted surfaces of the carbonaceous molded bodies. However, since the amount of thermal expansion at the time of graphitization is not uniform, a deviation in the axial dimension of the carbonaceous molded body group occurs as an inevitable problem.

  In the pressing from one side by the pusher, the absorption capacity of the axial dimension is limited, and transmission loss of force is likely to occur. As a result, the axial pressing force varies when the axial dimensions of the carbonaceous molded body groups of the two chambers deviate from each other, resulting in nonuniform surface pressures on the mutual butted surfaces of the carbonaceous molded bodies. Also, especially in long furnaces, the transmission loss of force increases and the pressing force tends to be insufficient, resulting in unstable, uneven heating conditions, product damage, cracks, alteration, pulverization, etc. Happens.

  In order to avoid such inconveniences, the present invention inserts a group of carbonaceous molded bodies in which baked carbonaceous molded bodies are arranged in series into a chamber arranged in parallel, and heats them by electrically connecting them in series. The graphitization furnace of the system is made to absorb the fluctuation of length due to the difference in the amount of thermal expansion of the carbonaceous compact group, and the current-carrying conditions and axial pressure of the carbonaceous compact group in each row are stable. An object of the present invention is to uniformly heat the molded product.

In order to solve the above problems, in the present invention, a graphitization furnace having the following elements is provided.
1) An axially long furnace body having two chambers arranged in parallel and separated from each other.
2) Two axially slidable first terminal electrodes individually facing the two chambers from outside the furnace at one end side of the furnace body.
3) Second terminal electrodes each having two upper and lower surfaces that can be slid in the axial direction individually facing the two chambers from outside the furnace at the other end of each furnace body.
4) A pusher that individually presses the first and second terminal electrodes in the axial direction.
5) A reaction force column that individually receives reaction forces acting on the first and second terminal electrodes.
6) A connector for electrically connecting the two second terminal electrodes outside the furnace.
The axial direction here refers to the longitudinal direction of the furnace body.

  Further, a surface pressure is applied to the mutual butted surfaces of a plurality of calcined carbonaceous molded bodies arranged in series in each chamber by the pusher, and in this situation, the carbonaceous material is energized between the two first terminal electrodes. The molded body was heated to a predetermined temperature with electric resistance.

Furthermore, the connector has the following elements.
i) A pair of horizontally arranged conductor plates that are respectively connected to the upper or lower surfaces of the two second terminal electrodes and face the free ends.
ii) A movable frame that is pivotally connected to one of the conductor plates and the other end to the other conductor plate by a vertical pivot shaft that is passed through a long hole extending in a direction perpendicular to the length of the furnace body.
iii) Opposed upper flexible conductor and lower flexible conductor supported by the movable frame.
iv) Upper and lower contacts that are long in the axial direction of the furnace body, provided on the lower surfaces of both ends of the upper flexible conductor and on the upper surfaces of both ends of the lower flexible conductor, respectively.
v) A contact pressing spring that urges the upper flexible conductor and the lower flexible conductor in opposite directions to press the upper contact and the lower contact against the upper and lower surfaces of the conductor plate.

Preferred configurations of this graphitization furnace are listed below.
(A) A connector having the same configuration as that of the connector is provided on both the upper and lower portions of the second terminal electrode, and electrical connection between the two second terminal electrodes is provided between the upper and lower portions of the second terminal electrode. What is done in two places.
(B) A pressing release mechanism is provided between the upper flexible conductor and the lower flexible conductor to push and move the upper and lower flexible conductors in opposite directions to separate the upper and lower contacts from the conductor plate. .
(C) The upper surface and the lower surface of the second terminal electrode are made flat and the conductor plate is attached to the upper and lower surfaces in surface contact.
(D) A contact surface of the upper contact and the lower contact is an R surface.
(E) The upper flexible conductor, the lower flexible conductor, the upper contact, and the lower contact are each divided into a plurality in the axial direction of the furnace body.

  In the graphitization furnace according to the present invention, the two second terminal electrodes are electrically connected outside the furnace, and the carbonaceous compact group is pressed from both sides with a pusher. Moreover, the freedom degree of the movement to a furnace body axial direction is provided to two 2nd terminal electrodes by making the connector which conducts two 2nd terminal electrodes into said structure.

  In the case of a furnace in which the carbonaceous compact groups arranged in two horizontal rows are electrically connected by the carbon block in the furnace, the axial pressing of the carbonaceous compact groups can be performed only from one side of the furnace, and the two chambers are connected to each other. When a difference in thermal expansion occurs in the inserted carbonaceous molded body group, the surface pressure of the butted portions of the carbonaceous molded bodies in both chambers varies.

  In response to this problem, the carbonaceous molded body group is electrically connected to the outside of the furnace, and the carbonaceous molded body group is pressed with a pusher from both sides, thereby eliminating the problem and reducing variations in surface pressure. Can do.

  Moreover, the connection structure of FIGS. 12-14 using a general flexible conductor was examined as a method of electrically connecting the two second terminal electrodes outside the furnace. In this connection structure, an L-shaped conductor plate 21 is bolted to the upper and lower surfaces of the second terminal electrode 4 and the flexible conductor 22 connects between the L-shaped conductor plates 21 and 21 of the two second terminal electrodes. It is. The flexible conductor 22 is tightened in the axial direction with a bolt to connect the end to the L-shaped conductor plate 21.

  In the connection structure of FIGS. 12 to 14, the flexible conductor 22 bends when the axial dimension of the carbonaceous molded body group inserted in the two chambers is shifted, thereby causing the second terminal electrodes 4 and 4 to move in the axial direction. Relative displacement is allowed.

  However, in this connection structure, the flexible conductor 22 provided between the second terminal electrodes interferes with the facility inspection corridor 23 installed outside the furnace, and there is a problem that the conductor arrangement as illustrated cannot be performed.

  Further, in this connection structure, when the difference in thermal expansion between the carbonaceous molded body groups inserted into the two chambers becomes large, a tensile force acts on the flexible conductor 22, and therefore, the connection between the L-shaped conductor plate 21 and the flexible conductor 22. The contact resistance may fluctuate and the stability of electrical conduction may be impaired. Furthermore, since the temperature in the furnace reaches 3000 ° C., it is subjected to a tensile force under a situation where the temperature rise due to the radiant heat of the connecting portion is significant, and therefore, it is not preferable in terms of ensuring durability.

  In addition, when relative movement exceeding the displacement absorption capacity of the flexible conductor 22 occurs between the two second terminal electrodes, the flexible conductor 22 may be disconnected or disconnected.

  The connector employed in the graphitization furnace of the present invention also addresses these problems. When the carbonaceous molded body in the furnace is thermally expanded or cooled and contracts, the conductor plate of this connector is integrated with the second terminal electrode connected to each conductor plate in the axial direction. It moves to.

  If the amount of axial movement of the pair of conductor plates at that time differs due to the unavoidable deviation of the amount of thermal expansion / contraction of the carbonaceous molded body groups in each row, the movable frame of the connector rotates about the pivot shaft. .

  The upper contact and the lower contact sandwich each conductor plate, but because the clamping pressure is applied by the force of the contact pressing spring, the movable frame of the connector is turned without any trouble, and the turning is progressing. Since the upper contact and the lower contact are pressed against the conductor plate with a stable force, the electrical conduction between the two second terminal electrodes is stably maintained.

  Also, by performing the electrical connection of the two second terminal electrodes with the above-mentioned connector, the space for installing the connector in the vertical direction can be reduced as compared with the connection part of FIG. 12, and the problem of interference with the corridor can be eliminated. it can. Furthermore, by using the connector, the axial push of the terminal electrode by the pusher can be performed without any trouble on the other end side of the furnace body in which the second terminal electrode is disposed.

As described above, the electrical connection of the two second terminal electrodes is performed by the connector, so that the length variation due to the difference in thermal expansion of the carbonaceous molded body group is stably absorbed, and the carbonaceous molding of each row is performed. The axial pressing by the pushers from both sides of the furnace of the body group is stabilized and the carbonaceous molded body is heated uniformly.
The operation and effect of the preferred configuration will be described later.

The top view which shows the outline | summary of the graphitization furnace of this invention Side view showing the outline of the graphitization furnace in FIG. Plan view of the mutual electrical connection of the second terminal electrode Sectional drawing along the XX line of FIG. The figure along the YY line of FIG. Top view of the state where the conductor plate of the connector is attached to the second terminal electrode The top view which shows operation | movement of a connector when the axial direction displacement amount of a 2nd terminal electrode becomes large on the right side The top view which shows operation | movement of a connector when the axial direction displacement amount of a 2nd terminal electrode becomes large on the left side Plan view showing another example of connector End view of the connector of FIG. Side view of the connector of FIG. The top view which shows the reference example of the connection structure of the 2nd terminal electrode Side view of the connection structure of FIG. 12 is a perspective view of the connection structure of FIG.

Hereinafter, an embodiment of a graphitization furnace according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, an exemplary graphitization furnace 1 includes a furnace body 2 that is formed long in the axial direction, first terminal electrodes 3 and second terminal electrodes 4 that are opposed to each other, and these terminal electrodes individually. It has a pusher 5 to press. Further, the reaction force column 6 that individually receives the reaction force acting on the first and second terminal electrodes 3 and 4 and the two second terminal electrodes 4 and 4 that make a pair are electrically connected outside the furnace. The connector 7 is combined.

  The furnace body 2 has two chambers 2a arranged in parallel and separated from each other (see FIG. 1). Two first terminal electrodes 3 are provided on one end side of the furnace body 2 so as to penetrate the furnace wall from the outside of the furnace and individually face the two chambers 2a and 2a.

  Each first terminal electrode 3 is arranged so as to be slidable in the axial direction, and is connected to a power source (that is, busbar bus 11 in the figure) via a power feeding device 8 outside the furnace.

  Further, two second terminal electrodes 4 are provided on the other end side of the furnace body 2 so as to penetrate the furnace wall from the outside of the furnace and individually face the two chambers 2a and 2a. The second terminal electrode 4 is also slidable in the axial direction. The second terminal electrode 4 has a flat upper surface 4a and lower surface 4b.

  The furnace body 2 may have a known structure. A detailed structure is disclosed in Patent Document 5 and the like. Therefore, the detailed description here is omitted.

  The pusher 5 is composed of a hydraulic cylinder or the like. The pusher 5 is supported by the reaction force column 6 installed in the building and presses the first and second terminal electrodes 3 and 4 in the axial direction and in the direction in which both approach each other.

  The reaction force column 6 is installed outside the furnace as shown in FIG. 2, and when the reaction force column 6 presses the terminal electrode in the axial direction and applies a surface pressure to the butted portion of the carbonaceous molded body, The reaction force applied to the pusher 5 is received.

  The connector 7 is provided at the upper part and the lower part of the second terminal electrode 4 (see FIG. 4), and the two second terminal electrodes 4 and 4 are connected to each other by the two sets of connectors 7.

Each connector 7 includes a pair of horizontally disposed conductor plates 7a _R and 7a _L ( _{R and L} are given for convenience of explanation) shown in FIGS. 3 to 6 and a movable plate disposed between the two conductor plates. It has a frame 7b. The movable frame 7b one end of the one conductor plate 7a _R, and a pivot shaft 7c which respectively connect the other end to the other conductor plate 7a _L, upper flexible conductor 7d _U and lower flexible conductor 7d _B of opposed And an upper contact 7e _U and a lower contact 7e _B that are long in the furnace body axis direction, and further, a contact pressing spring 7f that urges the upper contact 7e _U and the lower contact 7e _B toward each other.

The conductor plates 7a _R and 7a _L are connected to the upper and lower surfaces of the second terminal electrodes 4 and 4, respectively, and are opposed to the free ends. The conductor plates 7a _R and 7a _L are connected to the second terminal electrode 4 by bolts 9. The conductor plates 7a _R and 7a _L are in surface contact with the flat upper and lower surfaces of the second terminal electrodes 4 and 4, and are excellent in electrical conduction stability.

Movable frame 7b is top frame f ₁ and the lower frame f ₂ of oppositely _disposed, and a connecting frame f ₃ which connects the two parties. The movable frame 7b is connected to the conductor plates 7a _R and 7a _L by the pivot shaft 7c.

The conductor plates 7a _R and 7a _L are provided with a long hole 7g which is long in a direction perpendicular to the longitudinal direction of the furnace body in plan view, and a pivot shaft 7c is passed through the long hole 7g. The movable frame 7b can rotate with its pivot shaft 7c as a fulcrum.

Upper flexible conductor 7d _U and the lower flexible conductor 7d _B is supported by the movable frame 7b. The movable frame 7b is provided with insertion portions S with lateral openings at both ends into which both ends of the upper and lower flexible conductors are individually inserted so as to be movable up and down. The insertion portions S are arranged in two upper and lower stages, and two support walls W arranged in parallel are installed between the upper and lower insertion portions S.

The upper flexible conductor 7d _U and the lower flexible conductor 7d _B only need to be able to absorb the relative displacement of the upper contact 7e _U and the lower contact 7e _B due to the thermal expansion and contraction of the movable frame 7b. Not required.

The upper contact 7e _U and the lower contact 7e _B are contacts with the R contact surface, and are integrally provided on the lower surfaces of both ends of the upper flexible conductor 7d _U and the upper surfaces of both ends of the lower flexible conductor 7d _B , respectively. . The support wall W is provided with through holes corresponding to the contact points, and the upper contact point 7e _U and the lower contact point 7e _B are respectively inserted into the through holes so as to be able to appear and retract.

The upper contact 7e _U and the lower contact 7e _B and the upper and lower flexible conductors 7d _U and 7d _B that hold the individual contacts are divided in the axial direction as shown in the figure, and the degree of freedom of movement is high. preferable. The upper contact 7e _U and the lower contact 7e _B are contacts that are long in the axial direction even after being divided.

Contact pressure spring 7f is incorporated inside each spigot S, biases the opposite end portions of the upper flexible conductors 7d _U and the lower flexible conductor 7d _B toward each other. Due to the biasing force, the upper contact 7e _U and the lower contact 7e _B penetrating the support wall W are pressed against the upper and lower surfaces of the conductor plates 7a _R and 7a _{L on} the free end side.

As shown in the figure, when the upper and lower flexible conductors 7d _U and 7d _B are divided in the axial direction, each of the divided flexible conductors is individually pressed by the contact pressing spring 7f to It is preferable that the pressure on the conductor plate is made at an averaged pressure.

In the illustrated graphitization furnace 1, the connector 7 configured as described above is provided also on the lower surface side of the second terminal electrode 4, and electrical connection between the two second terminal electrodes 4, 4 is performed in the first graphitizing furnace 1. Two terminal electrodes 4 and 4 are formed at the upper and lower portions. By doing in this way, the load with respect to the connector 7 can be reduced and the durability of the connector 7 can be improved. The conductor plates 7 a _R and 7 a _L of the lower connector 7 are fixed to the lower surface 4 b of the second terminal electrode 4.

  The power feeding device 8 is disclosed in the aforementioned Patent Document 4 configured to connect a conductor plate to the first terminal electrode 3 and sandwich the conductor plate between the upper and lower contacts of the disconnector. It is preferable because of its excellent freedom of relative movement.

  In the exemplary graphitization furnace 1 configured as described above, the re-fired carbonaceous compacts C are arranged in series inside the chambers 2a, and the periphery thereof is made of coke filling powder for keeping heat and preventing oxidation. Encapsulate and fill. And in this state, it supplies with electricity through the terminal electrode which contact | abutted to the carbonaceous molded object of the terminal.

The power supply device 8 is connected to the first terminal electrode 3, and the two second terminal electrodes 4 are connected to the connector 7.
Connect.

  Further, the first and second terminal electrodes 3 and 4 are pressed in the axial direction from both ends of the furnace by the pusher 5, and a required surface pressure is applied to the mutual butted surfaces of the carbonaceous molded bodies C.

In this state, electric power is supplied from a DC power source to cause electricity to flow through the carbonaceous molded body groups C _R g and C _L g. In this way, each carbonaceous molded body C is heated by electric resistance and is heated to a required temperature (generally about 3000 ° C.) to perform graphitization.

This is accommodated in each chamber 2a by heating the carbonaceous molding group C _{R g,} C L _g is thermally expanded. If the amount of thermal expansion of the carbonaceous molded body groups C _R g and C _L g at that time is equal, the relative positions of the left and right conductor plates 7a _R and 7a _{L of} the connector 7 and the upper and lower contacts 7e _{U and} 7e _B Is maintained unchanged, and the state of the electrical connection by the connector 7 does not change at all.

On the other hand, carbonaceous molding group C _{R g,} C L the thermal expansion difference occurs between both carbonaceous molding group _g C _{R g,} when the axial length of the C L _g is changed, moving the connector 7 The frame 7b rotates as shown in FIGS. 7 and 8 with the left and right pivot shafts 7c as fulcrums.

When the thermal expansion amount of the carbonaceous molded body group C _R g is larger than the thermal expansion amount of the carbonaceous molded body group C _L g, the movable frame 7b is rotated in the clockwise direction in plan view as shown in FIG. If the magnitude relationship between the thermal expansion amounts of the left and right carbonaceous molded body groups C _R g and C _L g is opposite to the above, as shown in FIG. 8, it rotates in the counterclockwise direction as seen in a plan view. Move.

At this time, the upper contact 7e _U and the lower contact 7e _B are simply pressed against the conductor plates 7a _R and 7a _L by the force of the spring, so that these contacts bite into the conductor plates 7a _R and 7a _L. Such a force does not occur, so that the axial relative displacement of the two second terminal electrodes 4 and 4 proceeds without any trouble.

In the meantime, the upper contact 7e _U and the lower contact 7e _B of the connector 7 are pressed against the left and right conductor plates 7a _R and 7a _L with an average pressure, so that the electrical connection conditions by the connector 7 do not vary.

Further, when the respective carbonaceous molded body groups C _R g and C _L g are pressed by the pushers 5 from both ends of the furnace, the contact resistance of the butt surfaces between the carbonaceous molded bodies hardly varies.

  As a result, the energization conditions of the carbonaceous molded body groups in each row are stabilized and the carbonaceous molded bodies are heated uniformly, and the problems of quality variations and quality defects due to variations in heating are solved.

  Further, the electrical connection of the two second terminal electrodes 4 and 4 is performed by the connector 7, so that the space for installing the connector in the vertical direction is reduced, and interference with the corridor provided at the position of FIG. 13 as necessary. Can be eliminated.

9 to 11 show modifications of the connector 7. In many cases, a plurality of graphitization furnaces are arranged in parallel in the same factory. In that case, as an economical method, it is conceivable to make the same connector detachable and share one connector among a plurality of furnaces. When this method is adopted, it is necessary to be able to release the pressing of the upper contact 7e _U and the lower contact 7e _B against the conductor plate.

Connector 7 of 9 to 11, there is imparted with the function, and additionally provided a pressure release mechanism 10 between the upper flexible conductor 7d _U and the lower flexible conductor 7d _B. Other parts are the same as those of the connector of FIG. Therefore, the description here will be made only for the press release mechanism 10.

  The illustrated pressure release mechanism 10 is an application of a known slider crank mechanism, and includes a drive shaft 10a, a crank 10b fixed near both ends of the drive shaft 10a, and one end at each end of each crank. The two links 10c are paired so as to be rotatable, and the slide pins 10d are respectively attached to the other ends of the two links 10c.

The drive shaft 10a has an input part ip to which a handle (not shown) is attached at one end. The drive shaft 10a is rotatably laterally placed between the opposite side walls of the connecting frame f _3, it is rotated by operation of the handle attached to the input unit ip.

The link 10c connected to the crank 10b is disposed in a posture corresponding to the vicinity of both ends of the drive shaft 10a, and both ends of the slide pin 10d are fixed to the link 10c in a corresponding posture near both ends of the drive shaft 10a. . As the slide pin 10d can guide portion provided on the connecting frame f ₃ of the movable frame (not shown. Constituted by elongated grooves or holes) is guided by the moving up and down.

Slide pin 10d is the portion that is attached to one of the links in a pair curved upper flexible conductor 7d _U, which is attached to the other as in contact with the curved portion of the lower flexible conductor 7d _B ing.

The connector 7 rotates the drive shaft 10a by operating a handle attached thereto. As a result, the connecting point of the link 10c with respect to the crank 10b is displaced, so that the two slide pins 10d are pushed away from the drive shaft 10a. As a result, the upper flexible conductor 7d _U and the lower flexible conductor 7d _B are pushed and moved in opposite directions, and the upper contact 7e _U and the lower contact 7e _B follow the movement, and the conductor plates 7a _R , 7a _L is released.

  By releasing the pressing and releasing the connection with the conductor plate by the pivot shaft 7c, the connector 7 can be removed, and thus the same connector can be shared with other graphitization furnaces of common specifications. Become.

In this structure, when the release of the pressing by the pressing release mechanism 10 is made, in the separating direction both end portions of the upper flexible conductors 7d _U and the lower flexible conductor 7d _B is against the force of the contact pressure spring 7f Since it is necessary to move, the upper flexible conductor 7d _U and the lower flexible conductor 7d _B are used to be somewhat rigid.

Note that the connector 7 of the embodiment has a specification with a rated voltage of DC 300 V and a rated current of 90 kA, and there is a concern about a temperature rise during use. Therefore, in each case, water circulation passages (not shown) are formed in the conductor plates 7a _R and 7a _L , the upper and lower flexible conductors 7d _U and 7d _B, and the movable frame 7b, respectively. It is structured to forcibly cool these by flowing cooling water through the passage,
The forced cooling may be performed as necessary.

DESCRIPTION OF SYMBOLS 1 Graphitization furnace 2 Furnace body 2a Chamber 3 1st terminal electrode 4 2nd terminal electrode 4a Upper surface 4b Lower surface 5 Pusher 6 Reaction force column 7 Connector 7a _R , 7a _L conductor plate 7b Movable frame 7c Pivot shaft 7d _U upper flexible Conductor 7d _B Lower flexible conductor 7e _U Upper contact 7e _B Lower contact 7f Contact pressing spring 7g Long hole W Support wall S Insertion part f ₁ Upper frame f ₂ Lower frame f ₃ Connecting frame 8 Power supply device 9 Bolt 10 Press release mechanism 10a Drive shaft 10b Crank 10c Link 10d Slide pin 11 Bus bar bus line ip Input part C Carbonaceous molded body C _R g, C _L g Carbonaceous molded body group 21 L-shaped conductor plate 22 Flexible conductor 23 Walkway

Claims (7)

An axially long furnace body (2) having two chambers (2a) arranged in parallel and separated from each other, and an axial direction individually facing the two chambers (2a) from outside the furnace body at one end side of the furnace body Two slidable first terminal electrodes (3) and two slidable in the axial direction individually facing the two chambers (2a) from outside the furnace at the other end of each furnace body (2) Has a second terminal electrode (4) having upper and lower surfaces, a pusher (5) for individually pressing the first and second terminal electrodes (3, 4) in the axial direction, and the first and second terminal electrodes ( 3 and 4) having a reaction force column (6) that individually receives a reaction force acting on 3), and a connector (7) that electrically connects the two second terminal electrodes (4) outside the furnace,
A surface pressure is applied by the pusher (5) to the mutually butted surfaces of a plurality of calcined carbonaceous molded bodies (C) arranged in series in each chamber (2a), and in this situation, two first terminal electrodes (3, 3) is a graphitization furnace in which a carbonaceous molded body (C) is heated to a predetermined temperature with electric resistance by energizing between
The connector (7) is connected to the upper surface (4a) or the lower surface (4b) of the two second terminal electrodes (4, 4), respectively, and a pair of horizontally arranged conductor plates facing the free end side ( 7a _R , 7a _L ), one end is passed through one conductor plate (7a _R ) and the other end is passed through the other conductor plate (7a _L ) through a long hole (7g) elongated in the furnace body longitudinal direction. A movable frame (7b) that is pivotally connected with a vertical pivot shaft (7c) as a fulcrum, and an upper flexible conductor (7d _U ) and a lower portion that are opposed to each other and supported by the movable frame (7b). A flexible conductor (7d _B ), an upper contact (7e _U ) long in the furnace body axial direction provided on the lower surface of both ends of the upper flexible conductor (7d _U ) and the upper surface of both ends of the lower flexible conductor (7d _B ), Lower contact (7e _B ), upper flexible conductor (7d _U ) and lower Contact pressing spring that biases the upper flexible conductor (7d _B ) in the opposite direction and presses the upper contact (7e _U ) and the lower contact (7e _B ) against the upper and lower surfaces of the conductive plate (7a _R , 7a _L ) A graphitization furnace comprising (7f).   A connector (7) having the same configuration as that of the connector (7) is provided on both the upper part and the lower part of the second terminal electrode (4), and the two second terminal electrodes (4, 4) are electrically connected to each other. 2. The graphitization furnace according to claim 1, wherein the connection is made at two places, an upper part and a lower part of the second terminal electrode (4, 4). Between the upper flexible conductor (7d _U ) and the lower flexible conductor (7d _B ), the upper and lower flexible conductors are pushed in opposite directions to move the upper contact (7e _U ) and the lower contact (7e _B ). graphitizing furnace according to claim 2 having the conductor plate _(7a R, 7a _L) pressing release mechanism away from (10) a. The upper surface (4a) and the lower surface (4b) of the second terminal electrode (4) are made flat and the conductor plates (7a _R , 7a _L ) are brought into surface contact with the upper surface (4a) and the lower surface (4b). The graphitization furnace according to claim 2 or 3, wherein the graphitization furnace is attached. Graphitizing furnace according to claim 1, the contact surface was to the R plane of the top contact (7e _U) and bottom contacts (7e _B). It said upper contact (7e _U), graphitization furnace according to claim 1 which is divided into a plurality of lower contacts (7e _B) in the axial direction of the respective furnace body. The upper flexible conductor (7d _U ), the lower flexible conductor (7d _B ), the upper contact (7e _U ), and the lower contact (7e _B ) are each divided into a plurality in the axial direction of the furnace body. A graphitization furnace according to any one of the above.

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