JP5887838B2 - Dust collection duct and slab continuous casting machine having the same - Google Patents

Description

  The present invention comprises a fixed duct having an opening at the tip, and a moving duct having an opening at the tip and provided so as to be relatively movable with respect to the fixed duct. The present invention relates to a dust collection duct positioned at a communication position where the ducts communicate with each other and a separation position where the ducts are separated from each other, and more particularly, to a connection structure of openings between the ducts of this type of dust collection duct.

An example of this type of dust collection duct is a dust collection duct that collects dust gas discharged from the vicinity of the immersion nozzle above the mold in a slab continuous casting machine.
As shown in FIG. 10 (a), the slab continuous casting machine 100 shown in FIG. 10 has a predetermined processing position for casting a mold 5 for injecting and solidifying molten steel Y to form the outer shape of the slab S. Have. Below the mold 5, a plurality of pairs of slab support rolls including a support roll 6, a guide roll 7, a pinch roll (not shown), and the like are sequentially arranged. A tundish 2 for relaying and supplying molten steel Y supplied from a ladle (not shown) to the mold 5 is installed on the tundish car 8 at a predetermined position above the mold 5. A sliding nozzle 3 for adjusting the flow rate of the molten steel Y is installed at the bottom of the tundish 2, and an immersion nozzle 4 is installed on the lower surface of the sliding nozzle 3, so that the molten steel Y is injected into the mold 5. It has become.

Here, dust gas is discharged from the vicinity of the immersion nozzle 4 above the mold 5. Therefore, in order to collect the dust, the dust collecting device 130 is provided in the slab continuous casting machine.
The dust collector 130 includes a fixed duct 110 having an opening 110a at the tip and a moving duct 120 having an opening 120a at the tip as dust collecting ducts. The proximal end side of the fixed duct 110 is connected to the dust collector 13. On the other hand, the moving duct 120 is attached to the tundish car 8 and is movable with respect to the fixed duct 110 along with the movement of the tundish car 8. At the pouring position of the molten steel Y, the opening 110a between the ducts 110 and 120 is provided. , 120a are opposed to each other so that the ducts 110 and 120 communicate with each other, and at the relay position where the supplied molten steel Y is to be relayed from the ladle, the ducts 110 and 120 are located at separated positions. It is like that.

  Here, the connecting structure of the openings of the ducts 110 and 120 of the dust collecting duct 130 in this example is a fixed duct at the tip of the moving duct 120 as shown in an enlarged view of the main part in FIG. 110 is provided with a bellows portion 121 that can be expanded and contracted in a direction opposite to 110, and a pair of cylinders 122 as a drive mechanism that is arranged to expand and contract the bellows portion 121. As a result, in the dust collection duct 130, when the pair of cylinders 122 are extended at the communication position, the openings 110a and 120a of the ducts 110 and 120 are brought into close contact with each other. By shortening, the openings 110a and 120a of the ducts 110 and 120 are separated from each other.

JP-A-9-157656 JP 2010-281507 A

By the way, in the slab continuous casting machine, if the outer shell of the slab that passes through the mold breaks and a breakout occurs where hot water leaks from the surface of the slab, it is necessary to urgently maintain the equipment. It must be evacuated as soon as possible.
However, the dust collection duct 130 described above has a structure in which the connection state of the fixed duct 110 and the moving duct 120 firmly holds the close contact state of the openings 110a and 120a between the ducts 110 and 120 by the cylinder 122. There is a problem that the retreat operation of the tundish car 8 cannot be performed unless 122 is shortened and the openings 110a and 120a are separated from each other. In addition, if the operator moves to the retracting operation of the tundish car 8 without performing the shortening operation of the cylinder 122 so as to expedite the retracting operation of the tundish car 8, excessive force is applied to the openings 110a and 120a between the ducts 110 and 120. There is a problem that the equipment is damaged due to the action. In addition, since the drive mechanism uses a pair of cylinders 122, if the cylinders are out of synchronization with each other, it may cause a malfunction.

  As another example of this type of dust collection duct, Patent Documents 1 to 2 disclose a structure in which a fixed duct and a moving duct are respectively positioned at a communication position and a separation position by a driving mechanism such as the cylinder described above. Is disclosed. However, even in the technologies described in these patent documents, since the driving mechanism is located at the communication position and the separation position, it is the same as the dust collecting duct example in the slab continuous casting machine described above. The above problem cannot be solved.

Therefore, the present invention has been made paying attention to such problems, and is provided with a fixed duct having an opening at the tip, and an opening at the tip and being relatively movable with respect to the fixed duct. In a dust collection duct having a moving duct, and a relative position of the duct, the opening positions of the ducts face each other so that the ducts are in communication with each other, and the separation position where the ducts are separated from each other. In addition to providing a dust collection duct that can be easily located at a separated position even when the moving duct is moved at an arbitrary timing while ensuring a sufficient duct communication state for dust collection, It aims at providing the slab continuous casting machine provided.

In order to solve the above-described problem, a dust collection duct according to one aspect of the present invention is provided with a fixed duct having an opening at a tip, an opening at the tip and being relatively movable in a radial direction of the fixed duct. The dust collection is located at a communication position where the ducts are in communication with each other by opposing movement of the duct, and a separation position separated in the radial direction between the ducts by relative movement of the duct. One duct is provided at the distal end of the one duct, and is provided at the distal end of the one duct. The duct is extendable in the axial direction of the one duct and is extended when no load is applied. And a flange projecting in the radial direction of the one duct and a rotation that is provided at the tip of the telescopic pipe line and projects over a radial position outside the flange via a support arm. And the other duct has a sloped part that projects in the radial direction of the other duct and has a slope formed so that the distance from the flange of the one duct increases toward the edge. And when the moving duct is moved from the separation position to the communication position, the roller rides on the slope of the flange portion of the other duct prior to the flange edge of the one duct, The telescopic pipe line is shortened by the action of the pressing force in the axial direction, and the flange is protruded so as to surround the opening on the surface facing the other duct side. In addition, an elastic member is provided to directly contact the slope of the flange portion and relieve an impact at the time of contact in the relative movement .

  According to the dust collection duct according to one aspect of the present invention, when the moving duct is moved from the separation position to the communication position, the flange edge of one duct rides on the slope of the flange portion of the other duct, thereby Since the telescopic pipe is shortened by the action of the pressing force in the direction, the slope of the buttocks of the other duct functions as a “cam surface”, and the one duct corresponding to the “follower” A force that presses the flange in the axial direction to shorten the telescopic pipe can be transmitted. Therefore, one duct can be moved from the separation position to the communication position while eliminating the need for a special drive mechanism. Here, maintaining the communication state between the ducts is based on the force that the expansion pipe line tries to extend against the axial pressing force, but the connection of the dust collection duct is performed by the intake of the dust collector such as a blower. Since the inside becomes a negative pressure, there is little concern that dust gas will leak out even if the holding force is not strengthened (even if there is a slight gap). Therefore, even if it is the structure made to contact | abut with the expansion | extension force of an expansion-contraction pipe line, the communication state of a duct sufficient and sufficient for dust collection can be ensured.

And according to the above configuration, since there is no special drive mechanism for the movement from the communication position to the separation position, which is the opposite of the above, the flange edge is moved by the radial movement of one duct. By sliding down the slope of the flange portion of the duct, the axial pressing force against the telescopic pipe line is also released and no load is applied, so the telescopic pipe line naturally returns to the extended state. Therefore, even when the moving duct is moved at an arbitrary timing, it can be easily positioned at the separation position.
In particular, according to the dust collection duct according to one aspect of the present invention, a rotatable roller that is provided at the distal end portion of the telescopic pipe line and projects over a support arm at a position radially outward from the flange is provided. Since this roller rides on the slope of the flange of the other duct ahead of the flange edge of one duct, the impact at the time of contact with the slope of the flange can be mitigated, and the movement is made via rotation of the roller. Therefore, smooth operation can be achieved.

Further, according to the dust collection duct according to one aspect of the present invention, the flange is provided on the surface facing the other duct so as to surround the opening and directly contacts the slope of the flange. And since the elastic member which relieves the shock at the time of the contact in the said relative movement is further attached, it is suitable when relieving the shock at the time of the contact with the slope of a collar part.
Here, in the dust collection duct according to one aspect of the present invention, if the one duct is the moving duct and the other duct is the fixed duct, the flange portion having the inclined surface is on the fixed duct side. It is suitable for application to equipment having a plurality of processing positions arranged in parallel along the moving direction of the dust collection duct.
In this case, the fixed duct has slopes of the flanges on both sides in the moving direction, and the moving duct has the support arm and the rotatable roller protruding through the supporting arm in the moving direction. If they are provided on both sides, it is more desirable to realize stable operation in any moving direction .

Furthermore, in the dust collection duct according to one aspect of the present invention, the telescopic pipe line extends to a position overlapping with an opening edge of the other duct at the separation position, and the other duct at the communication position. If it is shortened to a position where it is in close contact with the edge of the opening, it is preferable to secure a duct communication state necessary and sufficient for dust collection by the extension force of the expansion pipe.

Furthermore, in order to solve the said subject, the moving equipment which concerns on 1 aspect of this invention is a slab continuous casting machine provided with the dust collector which collects dust gas through a dust collection duct , Comprising: The dust collecting duct according to any one of the aspects of the present invention described above is provided. With such a configuration, the moving equipment is equipped with a dust collecting duct that exhibits any of the above-described effects. Therefore, the moving duct is secured at the communication position while ensuring a sufficient and sufficient duct communication state. Can be easily positioned at the separated position even when the is moved at an arbitrary timing. Therefore , if the moving equipment is a slab continuous casting machine, the tundish car can be evacuated as soon as possible even if a breakout occurs.

As described above, according to the dust collection duct according to one aspect of the present invention and the slab continuous casting machine including the dust collection duct, the movable duct is secured while maintaining a duct communication state necessary and sufficient for dust collection at the mutual communication position of the ducts. Can be easily positioned at the separated position even when the is moved at an arbitrary timing.

It is a mimetic diagram explaining plane arrangement of equipment of a slab continuous casting machine which is one embodiment of moving equipment provided with a dust collection duct concerning one mode of the present invention. It is a schematic diagram (C arrow line view of FIG. 1) explaining the slab continuous casting machine which is one Embodiment of the moving equipment provided with the dust collection duct which concerns on 1 aspect of this invention. It is a figure (the figure corresponding to the A section in FIG. 1, the B arrow view in FIG. 2) explaining the principal part (connection structure of the opening part between ducts) of the dust collection duct shown in FIG. (A) shows the separation position, and (b) shows the communication position. It is a perspective view explaining the example of the modification of the cross-sectional form of a duct, and the example of the form of the slope of a collar part, The same figure (a) is an example with a cylindrical duct, (b) is a duct of a rectangular cross section. It is an example. It is a figure (corresponding to Drawing 3) explaining the modification (first modification) of the dust collection duct of Drawing 1, the figure (a) shows the separation position, and (b) shows the communication position. The schematic diagram of the plane arrangement | positioning explaining the modification of the installation of the equipment of the slab continuous casting machine which arranges a dust collection duct along with a moving direction and has several processing positions is shown, The figure (a) is FIG. (B) is a modified example. It is a figure (it respond | corresponds to Fig.3 (a)) explaining the modification (2nd modification) of the dust collection duct of FIG. 1, The figure has shown the separation position. It is a figure (corresponding to Drawing 3 (a)) explaining the modification (third modification) of the dust collection duct of Drawing 1, and the figure shows the separation position. It is a figure (corresponding to Drawing 3) explaining the modification (the 4th modification) of the dust collection duct of Drawing 1, the figure (a) shows a separation position, and (b) shows the communication position. It is a schematic diagram explaining an example of the slab continuous casting machine provided with the conventional dust collection duct, The same figure (a) is the whole figure, (b) is the principal part enlarged view of (a).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
As shown in FIG. 1, this slab continuous casting machine 1 is provided with a predetermined processing position P for casting at the center of the forged floor. Then, two tundish cars 8 are arranged on the forged floor across the processing position P, and each tundish car 8 is movable in the left-right direction in FIG. On each tundish car 8, a tundish 2 is installed.

  As shown in the arrow C view of FIG. 1, the slab continuous casting machine 1 injects and solidifies molten steel Y at the predetermined processing position P to form the outer shape of the slab S. The mold 5 is provided. A plurality of pairs of slab support rolls including a support roll 6, a guide roll 7 and a pinch roll (not shown) are arranged below the mold 5. Further, the tundish 2 is installed on the tundish car 8 at a predetermined position above the mold 5 so that the molten steel Y supplied from a ladle (not shown) can be relayed to the mold 5. A sliding nozzle 3 for adjusting the flow rate of the molten steel Y is installed at the bottom of the tundish 2, and an immersion nozzle 4 is installed on the lower surface of the sliding nozzle 3 so that the molten steel Y is injected into the mold 5. It has become so.

Here, dust gas is discharged from the vicinity of the immersion nozzle 4 above the mold 5. Therefore, in order to collect the dust, the slab continuous casting machine 1 is provided with a dust collector 10.
Specifically, the dust collector 10 includes a fixed duct 11 having an opening 11a at the tip and a moving duct 12 having an opening 12a at the tip. The proximal end side of the fixed duct 11 is connected to the dust collector 13. On the other hand, the moving duct 12 is attached to the tundish car 8 and is movable relative to the opening 11a of the fixed duct 11 in the radial direction along with the movement of the tundish car 8 and injects molten steel Y. At the processing position P, the ducts 11 and 12 are connected to each other with the openings 11a and 12a facing each other, and the ducts 11 and 12 are in a communicating state. At the relay position where the supplied molten steel Y is to be relayed from the ladle, The ducts 11 and 12 are located at separated positions (see also FIG. 1). As shown in FIG. 1, in this example, a connection structure of a pair of ducts 11, 12 opening portions 11 a, 12 a is provided for each tundish 2.

Hereinafter, the connection structure of the openings 11a and 12a between the ducts 11 and 12 of the dust collection duct 10 will be described in detail with reference to FIG.
As shown to Fig.3 (a), one moving duct 12 has the expansion part 20 at the front-end | tip of a moving duct as an expansion-contraction pipe line. The expansion portion 20 can be expanded and contracted in the axial direction of the moving duct 12 and is in an extended state when there is no load. An annular flange 21 projecting in the radial direction of the moving duct 12 is provided at the tip of the expansion portion 20. In the extended state, the surface of the distal end of the moving duct 12 is extended to a position that is flush with or overlaps with the surface of the distal end of the fixed duct 11 (the position indicated by the broken line in the figure). See).

On the other hand, the other fixed duct 11 is provided with a flange 22 at the tip of the fixed duct 11. The flanges 22 project to the left and right in the radial direction of the fixed duct 11 along the moving direction of the moving duct 12, and the left and right flanges 22 are connected to the flange 21 of the moving duct 12 toward the edge. Each has a slope 22a formed so that the opposing distance is widened.
With such a configuration, when the moving duct 12 is moved from the separated position shown in FIG. 3A to the communicating position shown in FIG. 3B, the edge 21e of the flange 21 of the moving duct 12 is fixed to the fixed duct. 11, the expansion portion 20 is shortened by the action of the pressing force F in the axial direction of the moving duct 12.

Next, the operation and effect of the dust collecting duct of the slab continuous casting machine 1 and the dust collecting device 10 provided in the slab continuous casting machine 1 will be described.
When a breakout occurs in the slab continuous casting machine 1, it is necessary to maintain the facility urgently. Therefore, the tundish car 8 must be retreated from the processing position P as soon as possible. At this time, the dust collector 10 of the slab continuous casting machine 1 is configured such that when the moving duct 12 is moved from the separation position (FIG. 3A) to the communication position (FIG. 3B), the flange of the moving duct 12 is used. Since the edge portion 21e rides on the inclined surface 22a of the flange portion 22 of the fixed duct 11, the expansion portion 20 that is an expansion duct is shortened by the action of the pressing force F in the axial direction. The inclined surface 22a of the flange portion 22 functions as a “cam surface”, and can transmit a force for pressing the flange 21 of the moving duct 12 corresponding to the “driven portion” in the axial direction to shorten the expansion portion 20. Therefore, the moving duct 12 can be moved from the remote position to the communication position while eliminating the need for a special drive mechanism.

  Here, the mutual communication state of the ducts 11 and 12 is maintained by the force that the expansion portion 20 tends to extend against the axial pressing force F. The dust collecting duct 10 is connected by a blower or the like. Since the inside of the duct becomes negative pressure due to the intake air in the dust collector, there is little concern that dust gas will leak out even if the holding force is not strong (even if there is a slight gap). Therefore, even if it is the structure contact | abutted by the expansion force of the expansion part 20, the communication state of the ducts 11 and 12 necessary and sufficient for dust collection can be ensured.

  And according to the above configuration, there is no special drive mechanism for the movement from the communication position (FIG. 3B) to the separation position (FIG. 3A), which is the reverse of the above. Due to the radial movement of the duct 12, the flange edge 21 e slides down the inclined surface 22 a of the flange portion 22 of the fixed duct 11, thereby releasing the axial pressing force F against the expansion portion 20 and causing no load. The expansion unit 20 naturally returns to the extended state. Therefore, even when the moving duct 12 is moved at an arbitrary timing, it can be easily positioned at the separation position. Therefore, for example, even when a breakout occurs, the tundish car 8 can be evacuated as quickly as possible.

Note that the dust collection duct and the moving equipment including the dust collection duct according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the moving duct 12 has the expansion portion 20 as the telescopic pipe line and the flange 21 at the tip thereof, and the fixed duct 11 has the flange portion 22 having the inclined surface 22a. However, since the movement relationship between the ducts 11 and 12 is relative, the reverse configuration, that is, the fixed duct 11 has an expansion portion and a flange as an expansion pipe, and the movement duct 12 has a slope. It is good also as a structure which has a collar part to have. However, as in the above-described embodiment, if the flange portion having the inclined surface is on the fixed duct side, it is applied to a facility having a plurality of processing positions P arranged in parallel along the moving direction of the dust collection duct. Is preferred.

  In this case, as shown in the perspective view of FIG. 4, the fixed duct 11 has a slope 22 a of the flange portion 22 on both sides in the moving direction, so that stable operation can be realized in any moving direction. More desirable. In addition, it is more desirable for the portion where the inclined surface 22a and the surface of the opening 11a of the duct 11 are connected to have an R shape (symbol R in the figure) to achieve stable operation. In the above embodiment, the shape of the cross section of each duct is not particularly mentioned, but it is natural that various shapes can be adopted as the shape of the cross section of the duct as long as it can suck gas. For example, a cylindrical shape may be employed as shown in FIG. 4A, or a rectangular cross section may be employed as shown in FIG.

  Further, for example, in the above-described embodiment, the example has been described in which the flange edge portion 21e of the moving duct 12 and the inclined surface 22a of the flange portion 22 of the fixed duct 11 are in direct contact with each other. As in the example, if the flange 21 is further provided with an elastic member 24 projecting so as to surround the opening 12a on the surface facing the other fixed duct 11 side, the slope 22a of the flange 22 is provided. It is suitable for reducing the impact at the time of contact. If the thickness (length in the axial direction) of the elastic member 24 is appropriately set, the axial pressing force F against the expansion portion 20 can be set in the same manner as in the above-described embodiment while reducing the impact at the time of contact. In addition, as a material of the elastic member 24, rubber | gum and a silicon raw material can be employ | adopted suitably.

  Further, for example, in the above embodiment, a slab continuous casting machine is taken as an example of the moving equipment, and a pair of ducts 11 and 12 are mutually connected to each tundish 2 as shown again in FIG. Although the example which provided the connection structure of opening part 11a, 12a separately was demonstrated, it is not restricted to this, For example, as shown to the same figure (b), while fixing the fixed duct 11 to one place, each tundish 2 It is good also as a structure integrated also about the movement duct 12 corresponding to these.

  In the above embodiment, for example, the flange 21 is provided on the moving duct 12 side and the flange 22 having a predetermined slope 22a is provided on the fixed duct 11 side. However, FIG. 7 shows a modification. Thus, it is good also as a structure which replaces with the flange 21 and provides the collar part 23 with the predetermined slope 23a on the moving duct 12 side similarly to the collar part 22 with the predetermined slope 22a demonstrated in the said embodiment. Even if it is such a structure, there can exist an effect similar to the said embodiment. In addition, such a configuration is abutting between the inclined surfaces 22a and 23a, which is suitable for reducing the impact at the time of contact. Therefore, it is desired to sufficiently secure the overlap margin of the expansion portion 20. It is preferable in some cases. For example, in the example of the above embodiment, if it is adopted when the accuracy of the traveling track of the tundish car 8 is low, it is a preferable configuration for absorbing variations in the stop position.

  Further, for example, in the above-described embodiment, the flange portion 22 of the fixed duct 11 protrudes to the left and right in the radial direction of the fixed duct 11 along the moving direction of the moving duct 12. Although the example which has each inclined surface 22a formed so that the opposing distance with the flange 21 of the moving duct 12 may spread as it goes to a part is demonstrated, it is not restricted to this, For example, the moving direction of the moving duct 12 is equipment. If it is limited to one of the left and right sides, the collar may be formed only in one of the radial directions (the side corresponding to the moving direction). Further, when the moving direction is limited to one side as described above, as shown in a modified example in FIG. 8, both the ducts 11 and 12 may be provided with flanges 22 and 21 and the surfaces thereof may be inclined. That is, the opposite edges of the mutual flange contact surfaces 22a and 21a on the entry side and the entry side in the moving direction are inclined toward the side opposite to the openings 11a and 12a in the axial direction. It can be configured.

  For example, in the above-described embodiment or modification, an example in which a flange edge, a slope of the flange, an elastic member, or the like is brought into contact with the slope of the flange that functions as a “cam surface” is described. For example, as shown in a modified example shown in FIG. 9, a rotatable roller 25 that protrudes through the support arm 25 a may be provided at the tip of the moving duct 12. And it is good also as a structure which makes mutual movement of a separation position (FIG. 9 (a)) and a communication position (FIG.9 (b)) run on this roller 25 with respect to the inclined surface 22a of the collar part 22. FIG. . Even with such a configuration, it is possible to mitigate the impact at the time of contact with the slope of the collar portion, and the movement can be performed through the rotation of the roller 25, which is preferable for smooth operation. .

  Further, for example, in the above embodiment, the dust collection duct according to one aspect of the present invention has been described as an example applied to a dust collection device of a slab continuous casting machine, but the present invention is not limited thereto. A fixed duct having an opening at the tip, and a moving duct having an opening at the tip and capable of relative movement in the radial direction of the fixed duct, and facing the openings between the ducts by relative movement of the duct Thus, the present invention can be applied to a dust collection duct having a structure positioned at a communication position where the duct is in a communication state and a separation position separated from each other in the radial direction of the duct, and a moving facility including the dust collection duct. For example, the present invention can be applied to a dust collection duct of a coal collector for a coke oven in a coke oven as an example of application to other mobile equipment.

1 Slab continuous casting machine (mobile equipment)
2 Tundish 4 Immersion nozzle 5 Mold 6 Support roll 7 Guide roll 8 Tundish car 10 Dust collector 11 Fixed duct 12 Moving duct 13 Dust collector 20 Expansion section (expandable duct)
21 Flange 22 butt P Processing position Y Molten steel

Claims (5)

A fixed duct having an opening at the tip, and a moving duct having an opening at the tip and capable of relative movement in the radial direction of the fixed duct, and facing the openings between the ducts by relative movement of the duct And a dust collection duct positioned at a communication position where the duct is in a communication state and a separation position spaced apart in the radial direction between the ducts,
One duct is provided at the leading end of the one duct and can be expanded and contracted in the axial direction of the one duct and is in an extended state when no load is applied. A flange projecting in the radial direction of the duct, and a rotatable roller provided at a distal end portion of the telescopic pipe line and projecting via a support arm at a position radially outside the flange,
The other duct has a flange portion having a slope formed so as to extend in a radial direction of the other duct and to extend a distance from the flange of the one duct toward the edge portion.
When the moving duct is moved from the separation position to the communication position, the roller rides on the slope of the flange portion of the other duct in advance in the axial direction before the flange edge of the one duct. of being adapted to shorten the telescopic pipe by the action of the pressing force,
Further, the flange is provided on the surface facing the other duct side so as to surround the opening, and is in direct contact with the slope of the flange to reduce the impact at the time of contact in the relative movement. A dust collecting duct having a member attached thereto .   The dust collection duct according to claim 1, wherein the one duct is the moving duct and the other duct is the fixed duct. The fixed duct has slopes of the flange on both sides in the moving direction,
3. The dust collection duct according to claim 2, wherein the moving duct has the support arm and the rotatable roller projecting through the supporting arm on both sides in the moving direction. The telescopic pipe line extends to a position that overlaps with the opening edge of the other duct at the separation position, and is shortened to a position that closely contacts the opening edge of the other duct at the communication position. The dust collection duct according to any one of claims 1 to 3 , wherein A slab continuous casting machine equipped with a dust collector for collecting dust gas through a dust collection duct,
A slab continuous casting machine comprising the dust collection duct according to any one of claims 1 to 4 as the dust collection duct.

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