JP2014152360A - Vacuum tank replacing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum tank replacing apparatus which can replace a vacuum tank with a small number of dedicated devices, and to provide a vacuum tank replacing method.SOLUTION: A vacuum tank replacing apparatus E2 is a vacuum tank replacing apparatus for replacing a vacuum tank 2 in a vacuum degassing apparatus 1 including the vacuum tank 2 and a ladle 3, and comprises: a carrier truck 10 which is used for both of conveyance of the ladle 3 and conveyance of the vacuum tank 2; and an ascending and descending device 11 which is used for both of ascent and descent of the ladle 3 and ascent and descent of the vacuum tank 2.

Description

  The present invention relates to a vacuum chamber exchange device and a vacuum chamber exchange method for exchanging a vacuum chamber of a vacuum degassing apparatus.

  Conventionally, in a steelmaking facility, vacuum degassing processing such as RH method and DH method is performed. A vacuum degassing apparatus for performing such vacuum degassing treatment includes a vacuum tank and a ladle disposed below the vacuum tank in a state where the molten steel is filled, and the molten steel in the ladle is vacuumed in a vacuum state. A vacuum degassing treatment of the molten steel is performed by refluxing between the tanks. A refractory material such as a refractory brick is built on the inner surface of the vacuum chamber. The refractory material is worn as the vacuum degassing process is repeated. For this reason, the vacuum tank is moved from the degassing processing position for vacuum degassing processing to the repairing position for rebuilding the refractory material, and the vacuum tank newly constructed with the refractory material is returned to the degassing processing position. It is necessary to perform replacement work.

  As a vacuum tank replacement work method, a vacuum tank at a degassing processing position is lifted with an overhead crane and moved to a repair position. In order to lift the vacuum tank at the degassing processing position with a crane, a crane garter for crane placement is required above the vacuum tank, so that the building tends to be high-rise and the construction cost tends to be high. Further, ancillary facilities such as an alloy addition device and an acid feeding lance device are provided above the vacuum tank at the degassing position. If a space for crane placement is secured above the vacuum chamber, it is difficult to secure a space for installing these incidental facilities.

  On the other hand, Patent Document 1 discloses a lower tank replacement carriage that lowers a lower tank of a vacuum tank having an upper tank and a lower tank from a degassing processing position and carries it out from below the degassing processing position. . The lower tank exchange carriage has a support table that supports the lower tank and an elevating device that raises and lowers the support table.

JP 2009-173981 A

  However, the lower tank exchange truck described in Patent Document 1 is a dedicated device used only for exchanging the vacuum tank. It is desirable that the number of such dedicated devices is small because they are not used during the vacuum degassing process.

  Then, an object of this invention is to provide the vacuum chamber exchange apparatus and vacuum chamber exchange method which can replace a vacuum chamber with few dedicated apparatuses.

  The vacuum tank exchange apparatus according to the present invention is a vacuum tank exchange apparatus for exchanging a vacuum tank of a vacuum degassing apparatus having a vacuum tank and a ladle, and is used for both ladle transportation and vacuum tank transportation. A transport carriage, and a lifting device used for lifting and lowering the ladle and the vacuum chamber.

  According to this vacuum chamber exchange device, the vacuum chamber is transported by the transport carriage used for transporting the ladle, and the vacuum chamber is moved up and down by the lifting device used for lifting and lowering the ladle, so that the vacuum chamber is replaced. be able to. Thereby, the vacuum chamber can be exchanged with a small number of dedicated devices. Moreover, in a normal vacuum degassing apparatus, the ladle filled with molten steel is heavier than the vacuum tank. For this reason, the raising and lowering of the ladle, the raising and lowering device used for conveyance, and the conveyance carriage are used for exchanging the vacuum tank, so that the raising and lowering of the vacuum tank with sufficient driving force without increasing the size of the raising and lowering apparatus and the conveyance carriage, Transport can be performed.

  The lifting device may raise and lower the vacuum chamber with a stroke larger than the stroke for raising and lowering the ladle. In this case, the vacuum chamber can be easily transported by the transport carriage by sufficiently lowering the vacuum chamber disposed at the degassing position above the ladle.

  You may further provide the base for vacuum tanks which are mounted in a conveyance trolley, support a vacuum tank, and are raised-lowered with a raising / lowering apparatus. In this case, the vacuum chamber can be firmly placed on the elevating device for the ladle and the conveying cart for the ladle by interposing the gantry for the vacuum chamber.

  The vacuum chamber pedestal includes a base portion placed on the transport carriage, a support portion placed on the base portion and supporting the vacuum chamber, and a position adjusting device that adjusts the position of the support portion relative to the base portion. You may have. In this case, when the vacuum chamber is moved from the degassing processing position to the repairing position, the position of the supporting portion is adjusted with respect to the vacuum chamber at the degassing processing position by adjusting the position of the supporting portion by the position adjusting device. The vacuum chamber can be securely placed on the support. On the other hand, when returning the vacuum chamber from the repair position to the degassing processing position, the position of the supporting portion is adjusted by the position adjusting device, so that the vacuum chamber supported by the supporting portion is returned to the degassing processing position with high accuracy. be able to.

  The vacuum degassing apparatus further includes a holding member that holds the vacuum chamber, and further includes a holding / release switching device that switches between a holding state in which the holding member holds the vacuum chamber and a release state in which the holding member releases the vacuum chamber. Good. In this case, when the vacuum chamber is moved from the degassing processing position to the repair position, the vacuum chamber can be quickly transferred from the holding member to the lifting device by switching the holding state to the release state by the holding / release switching device. On the other hand, when the vacuum chamber is returned from the repair position to the degassing processing position, the vacuum chamber is raised to the degassing processing position by the lifting device, and then the release state is switched to the holding state by the holding / release switching device. The vacuum chamber can be quickly delivered from the apparatus to the holding member.

  The vacuum chamber has a holding projection protruding laterally, and the holding / release switching device holds the holding projection from below by the holding member in the holding state, and below the holding projection in the released state. The holding member may be retracted from. In this case, in the holding state, the vacuum chamber can be firmly held against gravity by holding the holding convex portion from below by the holding member. Further, the holding state can be switched to the released state only by retracting the holding member from below the holding convex portion. For this reason, the configuration of the hold / release switching device can be simplified. In the holding state, since the holding convex portion is pressed against the holding member, the holding member cannot be easily retracted from below the holding convex portion. On the other hand, it is possible to easily retract the holding member from below the holding convex portion by raising the vacuum chamber by the lifting device. Thus, cooperation between the holding / release switching device and the lifting / lowering device also contributes to simplification of the configuration of the holding / release switching device.

  A vacuum chamber replacement method according to the present invention is a vacuum chamber replacement method for exchanging a vacuum chamber of a vacuum degassing apparatus having a vacuum chamber and a ladle, and the vacuum chamber is transported by a transport carriage used for transporting the ladle. The vacuum chamber is moved up and down by a lifting device used for lifting and lowering the ladle. According to this vacuum chamber replacement method, the vacuum chamber can be replaced with a few dedicated devices. Moreover, in a normal vacuum degassing apparatus, the ladle filled with molten steel is heavier than the vacuum tank. For this reason, the raising and lowering of the ladle, the raising and lowering device used for conveyance, and the conveyance carriage are used for exchanging the vacuum tank, so that the raising and lowering of the vacuum tank with sufficient driving force without increasing the size of the raising and lowering apparatus and the conveyance carriage, Transport can be performed.

  The vacuum chamber may be lifted and lowered by the lifting device with a stroke larger than the stroke of lifting and lowering the ladle by the lifting device. In this case, the vacuum chamber can be easily transported by the transport carriage by sufficiently lowering the vacuum chamber disposed at the degassing position above the ladle.

  A vacuum tank pedestal that supports the vacuum chamber may be placed on the transport carriage, and the vacuum tank may be placed on the transport carriage via the vacuum tank pedestal. In this case, the vacuum chamber can be firmly placed on the elevating device for the ladle and the conveying cart for the ladle by interposing the gantry for the vacuum chamber.

  A vacuum chamber pedestal comprising: a base portion placed on the transport carriage; a support portion placed on the base portion for supporting the vacuum chamber; and a position adjusting device for adjusting the position of the support portion relative to the base portion. It may be used. In this case, when the vacuum chamber is moved from the degassing processing position to the repairing position, the position of the supporting portion is adjusted with respect to the vacuum chamber at the degassing processing position by adjusting the position of the supporting portion by the position adjusting device. The vacuum chamber can be securely placed on the support. On the other hand, when returning the vacuum chamber from the repair position to the degassing processing position, the position of the supporting portion is adjusted by the position adjusting device, so that the vacuum chamber supported by the supporting portion is returned to the degassing processing position with high accuracy. be able to.

  The vacuum degassing device further includes a holding member that holds the vacuum chamber, and further uses a holding / release switching device that switches between a holding state in which the holding member holds the vacuum chamber and a release state in which the holding member releases the vacuum chamber. After the holding state is switched to the release state by the release switching device, the vacuum chamber may be lowered by the lifting device, and after the vacuum chamber is lifted by the lifting device, the release state may be switched to the holding state by the holding / release switching device. In this case, when the vacuum chamber is moved from the degassing processing position to the repair position, the vacuum chamber can be quickly transferred from the holding member to the lifting device by switching the holding state to the release state by the holding / release switching device. On the other hand, when the vacuum chamber is returned from the repair position to the degassing processing position, the vacuum chamber is raised to the degassing processing position by the lifting device, and then the release state is switched to the holding state by the holding / release switching device. The vacuum chamber can be quickly delivered from the apparatus to the holding member.

  Using a vacuum chamber having a holding projection protruding sideways, the holding projection is held from below by the holding member in the holding state, and the holding member is retracted from below the holding projection in the released state. When switching the holding state to the releasing state using the release switching device, after lifting the vacuum chamber by the lifting device, the holding member is retracted from below the holding convex portion and the releasing state is switched to the holding state. In this case, after the holding member is disposed below the holding convex portion, the vacuum chamber may be lowered by the lifting device. In this case, in the holding state, the vacuum chamber can be firmly held against gravity by holding the holding convex portion from below by the holding member. Further, the holding state can be switched to the released state only by retracting the holding member from below the holding convex portion. For this reason, the configuration of the hold / release switching device can be simplified. In the holding state, since the holding convex portion is pressed against the holding member, the holding member cannot be easily retracted from below the holding convex portion. On the other hand, the holding member can be easily retracted from the lower side of the holding projection by raising the vacuum chamber with the lifting device. Thus, cooperating the holding / release switching device and the lifting / lowering device also contributes to the simplification of the configuration of the holding / release switching device.

  According to the vacuum chamber exchange device and the vacuum chamber exchange method according to the present invention, the vacuum chamber can be exchanged with a small number of dedicated devices.

It is a schematic diagram which shows schematic structure of a vacuum degassing apparatus. It is a side view of a vacuum chamber. It is a side view of a ladle. It is a side view which shows schematic structure of a ladle exchange apparatus. It is a side view which shows the process of conveying a ladle. It is a side view which shows the process of raising a ladle. It is a side view which shows schematic structure of a vacuum chamber exchange apparatus. It is a top view of the base for vacuum chambers. It is a top view which shows the holding | maintenance release switching apparatus of a holding state. It is sectional drawing which follows the XX line in FIG. It is a top view which shows the holding | maintenance release switching apparatus of a releasing state. It is a side view which shows the process of conveying the vacuum chamber mount. It is a side view which shows the process of raising the stand for vacuum chambers. It is a side view which shows the process of dropping a vacuum chamber and hold | maintaining again. It is a side view which shows the process of lowering the lower tank of a vacuum chamber. It is a side view which shows the process of conveying the lower tank of a vacuum chamber. It is a side view which shows the process of conveying the vacuum chamber mount. It is a side view which shows the process of raising the stand for vacuum chambers. It is a side view which shows the process of lowering the upper tank of a vacuum chamber. It is a side view which shows the process of conveying the upper tank of a vacuum chamber.

  Hereinafter, a preferred embodiment of a vacuum chamber exchange device according to the present invention will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions are denoted by the same reference numerals, and redundant description is omitted.

  First, a vacuum degassing apparatus to which the vacuum chamber exchange apparatus according to this embodiment is applied will be described. As shown in FIG. 1, the vacuum degassing apparatus 1 is an RH vacuum degassing apparatus that performs an RH vacuum degassing process, and includes a vacuum chamber 2 and a ladle 3. The ladle 3 accommodates molten steel generated by a previous apparatus (for example, a converter) and is carried below the vacuum chamber 2. An exhaust port 2 a is formed in the upper part of the vacuum chamber 2. A vacuum exhaust device (not shown) is connected to the exhaust port 2a, and the inside of the vacuum chamber 2 is in a substantially vacuum state. A suction pipe 4 and a discharge pipe 5 are provided below the vacuum chamber 2 and open downward. The suction pipe 4 and the discharge pipe 5 are immersed in the molten steel filled in the ladle 3.

  The vacuum degassing apparatus 1 further includes a gas blowing device (not shown) for blowing an inert gas such as argon gas into the suction pipe 4 of the vacuum chamber 2. When an inert gas is blown into the suction pipe 4 by the gas blowing device, an air lift pump action occurs, and the molten steel in the ladle 3 is introduced into the vacuum chamber 2 from the suction pipe 4. Molten steel introduced into the vacuum chamber 2 returns to the ladle 3 through the discharge pipe 5. Thereby, molten steel circulates between the ladle 3 and the vacuum chamber 2. In the vacuum chamber 2, a negative pressure is applied to the molten steel, and the gas components dissolved in the molten steel are removed, so that the vacuum degassing process is continuously performed as the molten steel is circulated. The vacuum degassing apparatus 1 may be a DH vacuum degassing apparatus that performs DH vacuum degassing.

  As shown in FIG. 2, the vacuum tank 2 has an upper tank 6 and a lower tank 7 connected to the lower end of the upper tank 6. The suction pipe 4 and the discharge pipe 5 are provided at the bottom of the lower tank 7. The upper tank 6 is a metal tank opened downward and has a cylindrical side wall 6a extending in the vertical direction. A heat-resistant material such as a heat-resistant brick is lined on the inner surface of the upper tank 6. The lower tank 7 is a tank opened upward, and has a cylindrical side wall 7a extending in the vertical direction. A heat-resistant material such as heat-resistant brick is lined on the inner surface of the lower tank 7. Flange portions 6b and 7b are respectively formed at the lower end portion of the upper tub 6 and the upper end portion of the lower tub 7, and the upper tub 6 and the lower tub are joined by joining the flange portions 6b and 7b by bolt fastening or the like. 7 are connected.

  The upper tank 6 is provided with four holding convex portions 6c that are disposed so as to surround the side wall 6a and project laterally (see FIG. 9). The holding convex portion 6c is held by a holding / release switching device 22 (described later) provided on the beam 1a of the vacuum degassing device 1 or the like. The vacuum degassing treatment of the molten steel is performed in a state where the holding convex portion 6 c is held by the holding / release switching device 22. That is, the position of the vacuum chamber 2 when the holding convex portion 6c is held by the holding / release switching device 22 is the degassing processing position.

  In the upper tank 6, four holding convex portions 6 d that are disposed so as to surround the side wall 6 a and protrude laterally are provided in a portion above the holding convex portion 6 c. The holding convex portion 6d is temporarily held by the holding / release switching device 22 while the vacuum chamber 2 is being lowered. In the upper tank 6, the upper tank 6 is provided with four upper tank transfer protrusions 6 e that are disposed so as to surround the side wall 6 a and protrude laterally at a portion below the holding protrusion 6 c. The upper tank transfer convex portion 6e is supported by a vacuum tank mount 21 (described later). The number of each of the convex parts 6c, 6d, 6e is not limited to four, and can be changed as appropriate. The lower tank 7 is provided with four lower tank transfer convex portions 7c which are arranged so as to surround the side wall 7a and protrude laterally. The lower tank transfer convex portion 7c is supported by a vacuum tank mount 21 (described later). The number of the convex part 7c for lower tank conveyance is not restricted to four, It can change suitably.

  As shown in FIG. 3, the ladle 3 is a metal container that opens upward, and has an inverted frustoconical side wall 3 a that spreads upward. Flange portions 3b and 3c arranged in the vertical direction are formed outside the side wall 3a. Between the flange parts 3b and 3c, it arrange | positions so that the side wall 3a may be pinched | interposed, and the two axial convex parts 3d which protrude each side are formed. The tip of the shaft-like convex portion 3d protrudes outward from the outer edges of the flange portions 3b and 3c. A hook 12a of a crane 12 (described later) is hooked on the tip of the shaft-like convex portion 3d (see FIG. 4).

  Then, the ladle exchange apparatus E1 which replaces the ladle 3 filled with the molten steel after the vacuum degassing process and the ladle 3 filled with the molten steel before the vacuum degassing process will be described. As shown in FIG. 4, the ladle changing device E <b> 1 includes a transport carriage 10, an elevating device 11, and a crane 12.

  The transport cart 10 carries the ladle 3 filled with the molten steel before the vacuum degassing process into the lower part of the vacuum tank 2, and the ladle 3 filled with the molten steel after the vacuum degassed process from below the vacuum tank 2. Take it out. Hereinafter, “front / rear / left / right” in the description of the transport carriage 10 means a direction in which the traveling direction when the ladle 3 filled with the molten steel before the vacuum degassing process is carried below the vacuum chamber 2 is the front. To do.

  The transport carriage 10 includes a vehicle body portion 13, a front wheel 14 provided on the front side of the vehicle body portion 13, a rear wheel 15 provided on the rear side of the vehicle body portion 13, and a drive device mounted on the rear side of the vehicle body portion 13. 16. The drive device 16 incorporates a power source such as an electric motor and drives the front wheels 14 or the rear wheels 15. An opening 13 a that opens up and down is formed in a portion of the vehicle body 13 that is in front of the drive device 16. Two pan support bases 13b are provided on the left and right portions of the vehicle body 13 so as to protrude upward with the opening 13a interposed therebetween. The pan support 13 b supports the flange portion 3 c of the ladle 3. The lower end of the ladle 3 supported by the pan support 13b is accommodated in the opening 13a.

  The elevating device 11 includes an accommodation hole 18 formed in the floor below the vacuum chamber 2, a columnar elevating body 19 accommodated in the accommodation hole 18, and a drive device such as a hydraulic cylinder for elevating the elevating body 19 ( (Not shown). The lifting body 19 is located below the opening 13 a of the transport carriage 10 when the transport carriage 10 carries the ladle 3 below the vacuum chamber 2. The thickness of the elevating body 19 is set so that the elevating body 19 can be inserted into the opening 13 a of the vehicle body portion 13 of the transport carriage 10. The elevating device 11 elevates and lowers the ladle 3 placed on the transport carriage 10 by elevating the elevating body 19 through the opening 13a. The elevating device 11 is configured to be able to raise and lower the elevating body 19 with a stroke larger than the stroke necessary for raising and lowering the ladle 3. Thereby, in the replacement | exchange operation | work of the vacuum chamber 2 mentioned later, it is possible to raise / lower the raising / lowering body 19 with a big stroke compared with the stroke which raises / lowers the ladle 3. FIG.

  The crane 12 has two hooks 12a suspended from above. The two hooks 12 a are respectively hooked on the two shaft-like convex portions 3 d of the ladle 3. The crane 12 transports the ladle 3 and delivers it to and from the transport carriage 10.

  Subsequently, the procedure of the vacuum degassing process will be described. First, the ladle 3 filled with the molten steel before the vacuum degassing process is transported by the crane 12 and placed on the pan support 13 b of the transport carriage 10. Next, as shown in FIG. 5, the transport carriage 10 is moved forward, and the ladle 3 is carried below the vacuum chamber 2. At this time, the elevating body 19 of the elevating device 11 is positioned below the opening 13 a of the transport carriage 10.

  Next, as shown in FIG. 6, the elevating body 19 is raised by the driving device of the elevating device 11. Then, the ladle 3 is pushed up by the elevating body 19. As a result, the ladle 3 rises, and when the suction pipe 4 and the discharge pipe 5 of the vacuum chamber 2 are sufficiently immersed in the molten steel in the ladle 3, the lifting body 19 is stopped. This state is maintained and vacuum degassing is performed.

  When the vacuum degassing process is completed, the elevating body 19 is lowered, the bottom member 17 is returned into the opening 13a, and the ladle 3 is returned onto the pan support 13b. Next, the ladle 3 is unloaded from the lower side of the vacuum chamber 2 by the transport carriage 10, and the ladle 3 on the transport carriage 10 is pulled up by the crane 12 and transported to the subsequent apparatus.

  By repeating the above procedure, the vacuum degassing process can be continuously performed. Here, when such a vacuum degassing process is repeated over a long period of time, the refractory material on the inner surface of the vacuum chamber 2 is worn out. For this reason, it is necessary to repair the vacuum chamber 2 before the wear of the refractory material exceeds the allowable level. If repair work is performed without moving the vacuum chamber 2, it is necessary to stop the vacuum degassing process during that time, and the production efficiency is lowered. Therefore, the vacuum tank 2 is moved from the degassing position at the time of vacuum degassing processing to the repairing position at the time of repair work, and the replacement work for returning the vacuum tank 2 that has already been repaired to the degassing position instead. Need to do. Thereby, repair work of the vacuum chamber 2 moved to the repair position can be performed while continuing the vacuum degassing processing in the vacuum chamber 2 returned to the degassing processing position.

  Hereinafter, the vacuum chamber exchanging device E2 used for exchanging the vacuum chamber 2 will be described. The vacuum chamber exchanging device E2 includes the transport carriage 10, the lifting device 11, the crane 12, the vacuum chamber base 21, and a holding / release switching device 22. The transport carriage 10 used for transporting the ladle 3 is used for transporting the vacuum chamber 2 in replacement of the vacuum chamber 2. The lifting device 11 used for raising and lowering the ladle 3 is used for raising and lowering the vacuum chamber 2 in replacing the vacuum chamber 2. That is, the vacuum chamber exchange device E2 includes a transport carriage 10 that is also used for transporting the ladle 3 and the vacuum chamber 2, and a lifting device 11 that is also used for lifting and lowering the ladle 3 and lifting and lowering the vacuum chamber 2. ing.

  As shown in FIGS. 7 and 8, the vacuum chamber pedestal 21 includes a base portion 23 placed on the transport carriage 10, and a support portion 24 placed on the base portion 23 and supporting the vacuum chamber 2. And a position adjusting device 25 for adjusting the position of the support portion 24 with respect to the base portion 23. Hereinafter, in the description of the vacuum chamber pedestal 21, “front / rear / left / right” means “front / rear / left / right” in a state of being placed on the transport carriage 10. It means the direction in which the traveling direction when carrying in downward is the front.

  The base portion 23 is horizontally supported by the lower frame 26 horizontally placed on the vehicle body portion 13 of the transport carriage 10, a plurality of support frames 27 protruding upward from the lower frame 26, and the support frame 27. And an upper frame 28 and a plurality of legs 29 protruding downward from the lower frame 26. The lower frame 26 is placed on the vehicle body portion 13, and the plurality of leg portions 29 are accommodated in the opening portion 13a. The upper frame 28 has a rectangular shape composed of two sides along the front-rear direction and two sides along the left-right direction. An opening 28 a is formed at the center of the upper frame 28.

  The support portion 24 has a substantially rectangular shape composed of two sides along the front-rear direction and two sides along the left-right direction, and is placed on the upper frame 28. The support portion 24 is provided with a pair of convex portions 24a and 24b that project left and right in plan view. An opening 24 c is formed at the center of the support portion 24. The support part 24 is smaller than the upper frame 28 in a plan view, and each side of the support part 24 is located inside each side of the upper frame 28. The opening 24c of the support 24 is smaller than the opening 28a of the upper frame 28 in a plan view, and the periphery of the opening 24c is located inside the periphery of the opening 28a. A portion of the lower tank 7 below the lower tank transfer convex portion 7c can be inserted into the opening 24c of the support section 24, and a portion of the upper tank 6 below the upper tank transfer convex portion 6e. Can be inserted. The support part 24 supports the lower tank transfer convex part 7c or the upper tank transfer convex part 6e by the peripheral part of the opening 24c.

  The position adjusting device 25 includes eight hydraulic jacks 25a, 25b, 25c, 25d, 25e, 25f, 25g, and 25h fixed on the upper frame 28. The hydraulic jacks 25a and 25b are disposed so as to sandwich the front portion of the support portion 24 in the left-right direction. The hydraulic jacks 25c and 25d are arranged so as to sandwich the rear portion of the support portion 24 in the left-right direction. The hydraulic jacks 25e and 25f are arranged so as to sandwich the left convex portion 24a of the support portion 24 in the front-rear direction. The hydraulic jacks 25g and 25h are arranged so as to sandwich the convex portion 24b on the right side of the support portion 24 in the front-rear direction. The hydraulic jacks 25a and 25c push the support part 24 in the right direction, the hydraulic jacks 25b and 25d push the support part 24 in the left direction, the hydraulic jacks 25f and 25h push the support part 24 in the forward direction, and the hydraulic jacks 25e and 25g. Pushes the support 24 in the backward direction. The position adjusting device 25 drives the hydraulic jacks 25 a, 25 b, 25 c, 25 d, 25 e, 25 f, 25 g, and 25 h to shift the position of the support portion 24 from front to back and from side to side and to shift the position of the support portion 24 relative to the base portion 23. Adjust.

  As shown in FIGS. 9 and 10, the holding / release switching device 22 has four switching units 30 arranged so as to surround the upper tank 6. The switching unit 30 includes a fixing member 31 fixed on the beam 1 a of the vacuum degassing apparatus 1, a second holding member 32 connected to the fixing member 31, and an actuator 33. The fixing member 31 protrudes from the beam 1a to the vacuum chamber 2 side. The holding member 32 protrudes further from the tip of the fixing member 31 to the vacuum chamber 2 side. The proximal end portion of the holding member 32 and the distal end portion of the fixing member 31 are connected by a connecting shaft 34 that extends in the vertical direction. The holding member 32 is rotatable about the axis of the connecting shaft 34.

  The distal end portion of the holding member 32 is located below the holding convex portion 6 c of the vacuum chamber 2. Thereby, the holding convex portion 6 c is held from below by the holding member 32. By holding the holding convex portion 6c from below by the holding member 32, the upper tank 6 can be firmly held against gravity. On the upper surface of the distal end portion of the holding member 32, a concave portion 32a that accommodates the holding convex portion 6c is provided. Since the holding convex portion 6c fits into the concave portion 32a of the holding member 32, the horizontal position of the holding convex portion 6c is determined.

  The actuator 33 is, for example, a hydraulic cylinder, an electric cylinder, a ball jack or the like, and is provided so as to rotate the holding member 32 by expansion and contraction. The switching unit 30 switches the holding state in which the vacuum chamber 2 is held and the released state in which the vacuum chamber 2 is released by rotating the holding member 32 by the actuator 33. In the holding state, as described above, the holding convex portion 6c is held by the holding member 32 from below. In the released state, as shown in FIG. 11, the holding member 32 is retracted from below the holding convex portion 6c. In this way, the holding state and the released state can be switched with a simple configuration in which only the holding member 32 is rotated.

  Then, the exchange procedure of the vacuum chamber 2 is demonstrated. First, as shown in FIG. 7, a wire is connected to the upper portion of the vacuum chamber pedestal 21 to form a loop 35, and the hook 12 a of the crane 12 is hooked on the loop 35. The vacuum chamber pedestal 21 is transported by the crane 12 and placed on the vehicle body 13 of the transport cart 10. At this time, the leg portion 29 of the base portion 23 is accommodated in the opening portion 13 a and the lower frame 26 is horizontally placed on the vehicle body portion 13 of the transport carriage 10.

  Next, as shown in FIG. 12, the transport carriage 10 is moved forward, and the vacuum chamber base 21 is carried below the vacuum chamber 2. At this time, the elevating body 19 of the elevating device 11 is positioned below the opening 13 a of the transport carriage 10. Next, the elevating body 19 is raised by the driving device of the elevating device 11. Then, the vacuum chamber pedestal 21 is pushed up by the elevating body 19. As a result, when the vacuum tank pedestal 21 is raised, the lower part of the lower tank 7 is introduced into the opening 24c of the support part 24, and the support part 24 comes into contact with the lower tank transfer convex part 7c. 2 is pushed up entirely.

  At this time, the vacuum chamber 2 is placed on the lifting device 11 via the vacuum chamber mount 21. By interposing the vacuum chamber pedestal 21, the vacuum chamber 2 can be securely placed on the elevating device 11 for replacing the ladle 3. Further, before the vacuum chamber 2 is placed, the position of the support portion 24 is adjusted by the position adjusting device 25 so that the position of the support portion 24 is aligned with the vacuum chamber 2 at the degassing processing position. Can be firmly placed on the support 24.

  As shown in FIG. 13, when the vacuum chamber 2 rises together with the lifting body 19 and the holding convex portion 6 c comes out of the concave portion 32 a of the holding member 32, the lifting body 19 is stopped. Next, the holding member 32 is retracted from below the holding convex portion 6c (see FIG. 11). That is, the holding / release switching device 22 is switched from the holding state to the releasing state. Thereby, the vacuum chamber 2 can be lowered together with the elevating body 19. Thus, the vacuum chamber 2 can be quickly delivered from the holding member 32 to the lifting device 11 by switching the holding state to the released state.

  In the holding state, the holding convex portion 6c presses against the holding member 32 and the holding convex portion 6c enters the concave portion 32a, so that the holding member 32 is retracted from below the holding convex portion 6c. Can not. For this reason, it is possible to retract the holding member 32 from below the holding projection 6c by raising the vacuum chamber 2 by the lifting device 11. As described above, the cooperation between the holding / release switching device and the lifting / lowering device also contributes to the simplification of the configuration of the holding / release switching device 22.

  Next, the vacuum chamber 2 is lowered together with the lifting body 19. As shown in FIG. 14, when the holding convex portion 6c passes through the holding member 32, the holding member 32 is moved below the holding convex portion 6d (see FIG. 9). That is, the holding / release switching device 22 is switched from the released state to the held state. In this state, the upper tank 6 and the lower tank 7 are separated, and the elevating body 19 is lowered as shown in FIG. 15, and the vacuum tank mount 21 is placed on the vehicle body 13 of the transport carriage 10. Accordingly, the lower tank 7 is placed on the vehicle body portion 13 of the transport carriage 10 via the vacuum tank mount 21. By interposing the vacuum tank stand 21, the lower tank 7 can be firmly placed on the exchange carriage 10 for replacing the ladle 3. The raising / lowering stroke of the raising / lowering body 19 until it raises the raising / lowering body 19 toward the lower tank 7 and mounts the lower tank 7 on the vehicle body part 13 is the raising / lowering stroke of the raising / lowering body 19 at the time of replacing the ladle 3. Bigger than that. That is, the elevating device 11 lowers the lower tank 7 with a stroke larger than the stroke for raising and lowering the ladle 3. Thereby, the lower tank 7 arrange | positioned in the degassing process position above the ladle 3 is fully lowered | hung.

  Next, as shown in FIG. 16, the lower tank 7 is unloaded from the lower side of the upper tank 6 by the transport carriage 10. As described above, since the lower tank 7 is sufficiently lowered, the lower tank 7 can be easily conveyed while avoiding the upper beam and the like. Next, a wire is connected to the upper part of the lower tank 7 to form a loop 36, and the hook 12 a of the crane 12 is hooked on the loop 36. The lower tank 7 is conveyed by the crane 12, and the lower tank 7 is moved to the repair position.

  Next, as shown in FIG. 17, the transport carriage 10 is moved forward, and the vacuum tank mount 21 is carried below the upper tank 6. The elevating body 19 is raised by the driving device of the elevating device 11 and the vacuum chamber pedestal 21 is raised. When the vacuum tank pedestal 21 is raised, the lower part of the upper tank 6 is introduced into the opening 24 c of the support part 24, the support part 24 comes into contact with the upper tank transfer convex part 6 e, and the upper part 6 is moved by the support part 24. Pushed up. As a result, the upper tub 6 rises, and the elevating body 19 is stopped when the holding convex portion 6d comes out of the concave portion 32a of the holding member 32 (see FIG. 18).

  At this time, the upper tank 6 is placed on the lifting device 11 via the vacuum tank mount 21. By interposing the vacuum tank stand 21, the upper tank 6 can be firmly placed on the elevating device 11 for replacing the ladle 3. Further, before the upper tank 6 is placed, the position of the support portion 24 is adjusted by the position adjusting device 25 so that the position of the support portion 24 is adjusted with respect to the upper tank 6, and the upper tank 6 is changed to the support portion 24. Can be placed firmly.

  Next, as shown in FIG. 18, the holding member 32 is retracted from below the holding convex portion 6d (see FIG. 11). That is, the holding / release switching device 22 is switched from the holding state to the releasing state. Next, as shown in FIG. 19, the elevating body 19 is lowered and the vacuum chamber base 21 is placed on the vehicle body portion 13 of the transport carriage 10. As a result, the upper tank 6 is placed on the vehicle body 13 of the transport carriage 10 via the vacuum tank mount 21. By interposing the vacuum tank stand 21, the upper tank 6 can be firmly placed on the exchange carriage 10 for replacing the ladle 3. The lifting / lowering stroke of the lifting / lowering body 19 until the lifting / lowering body 19 is raised toward the upper tank 6 and the upper tank 6 is placed on the vehicle body 13 is the lifting / lowering stroke of the lifting / lowering body 19 when the ladle 3 is replaced. Bigger than that. That is, the lifting device 11 lowers the upper tank 6 with a stroke larger than the stroke for lifting the ladle 3. Thereby, the lower tank 7 arrange | positioned in the degassing process position above the ladle 3 is fully lowered | hung.

  As described above, before the upper tank 6 and the lower tank 7 are separated, the position of the entire vacuum tank 2 is shifted downward from the degassing processing position, and the portion held by the holding member 32 is held on the lower side. The convex portion 6c for use is changed to the convex portion 6d for holding on the upper side. Thereby, since the convex part 6e for upper tank conveyance has moved below, the stroke of the raising / lowering body 19 required to descend | fall the upper tank 6 currently hold | maintained at the holding member 32 becomes small. Therefore, the maximum stroke required for the lifting body 19 can be reduced. This contributes to downsizing of the lifting device 11.

  Next, as shown in FIG. 20, the upper tank 6 is carried out from below the holding / release switching device 22 by the transport carriage 10. As described above, since the upper tank 6 is sufficiently lowered, the upper tank 6 can be easily conveyed while avoiding the upper beam and the like. Next, a wire is connected to the upper part of the upper tank 6 to form a loop 37, and the hook 12 a of the crane 12 is hooked on the loop 37. The upper tank 6 is conveyed by the crane 12, and the upper tank 6 is moved to the repair position.

  Next, the upper tank 6 and the lower tank 7 that have already been repaired are installed at the degassing processing position by a procedure reverse to the procedure described so far. At this time, by adjusting the position of the support portion 24 by the position adjusting device 25, the position of the upper tank 6 or the lower tank 7 supported by the support portion 24 is adjusted, and the vacuum tank 2 is degassed with high accuracy. Can be returned to. Moreover, after raising the vacuum chamber 2 to the degassing processing position by the lifting and lowering device 11, the vacuum chamber 2 is quickly moved from the lifting and lowering device 11 to the holding member 32 by switching the release state to the holding state by the holding and releasing switching device 22. Can be handed over. Thus, the replacement operation of the vacuum chamber 2 is completed.

  Thus, according to the vacuum chamber exchange device E2, the vacuum chamber 2 is transported by the transport carriage 10 used for transporting the ladle 3, and the vacuum chamber 2 is moved up and down by the lifting device 11 used for lifting and lowering the ladle 3. Thus, the replacement work of the vacuum chamber 2 can be performed. Thereby, the vacuum chamber 2 can be replaced with a small number of dedicated devices. Moreover, in the normal vacuum degassing apparatus 1, the ladle 3 filled with molten steel is heavier than the vacuum chamber 2. For this reason, by using the raising / lowering device 11 used for raising / lowering and conveying of the ladle 3 and the conveying cart 10 for the exchange of the vacuum chamber 2, sufficient driving force can be obtained without increasing the size of the raising / lowering device 11 and the conveying cart 10. The vacuum chamber 2 can be moved up and down and conveyed.

  Moreover, the cost reduction of steelmaking equipment can be aimed at by using the conveyance trolley | bogie 10 and the raising / lowering apparatus 11 for the replacement | exchange of the pan 3 and the replacement | exchange of the vacuum chamber 2. Further, in the vacuum chamber exchange device E2, the crane 12 is also used for exchanging the ladle 3 and exchanging the vacuum chamber 2. For this reason, it is possible to further reduce the cost of the steelmaking facility.

  The preferred embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. When the vacuum chamber 2 is replaced, it is not always necessary to replace both the upper tank 6 and the lower tank 7, and the upper tank 6 and the lower tank 7 may be replaced at different times, with different frequencies. You may go. For example, when the upper tank 6 is less exposed to molten steel than the lower tank 7, the upper tank 6 may be replaced with a lower frequency than the lower tank. Moreover, you may replace | exchange the whole vacuum tank 2 simultaneously, without isolate | separating the upper tank 6 and the lower tank 7. FIG.

  DESCRIPTION OF SYMBOLS 1 ... Vacuum degassing apparatus, 2 ... Vacuum tank, 3 ... Ladle, 6c, 6d ... Holding convex part, 10 ... Conveyance cart, 11 ... Lifting device, 21 ... Vacuum tank mount, 22 ... Holding release switching device, 23 ... Base part, 24 ... Supporting part, 25 ... Position adjusting device, 32 ... Holding member, E2 ... Vacuum chamber exchange device.

Accordingly, the present invention aims at providing a vacuum tank exchange equipment can be exchanged in the vacuum chamber with a small dedicated device.

According to the vacuum chamber exchange equipment according to the present invention, it can be replaced in the vacuum chamber with a small dedicated device.

Vacuum tank exchanging apparatus according to the present invention, there is provided a vacuum tank exchanging apparatus for exchanging a vacuum chamber of a vacuum degassing apparatus having a vacuum chamber, and a ladle containing the upper tank and the lower tank, the conveyance of the ladle , A transport carriage that is also used for transporting the upper tank and the lower tank , and the upper tank and the upper tank with a larger stroke than the stroke for raising and lowering the ladle. a lifting device which Ru is simultaneously or individually lift the lower vessel is placed on the transporting carriage, it supports the upper tank and the lower tank simultaneously or individually, and a vacuum chamber for stand which is caused to lift by the lifting device, the vacuum The tank mount is a base part placed on the transport carriage, a support part placed on the base part and supporting the upper tank and the lower tank simultaneously or individually, and the position of the support part relative to the base part is adjusted. that having a position adjusting device for.

Lifting device, Ru upper tank and lower tank by simultaneously or individually lift a large stroke than the stroke of lifting the ladle. Therefore, the upper tank disposed degassing position above the ladle and the lower tank by sufficiently lowered, the upper tank and the lower tank can easily be transported by the transport carriage.

Conveying cart to be mounted to support the upper tank and the lower tank simultaneously or separately, further Ru comprising a vacuum chamber for stand which is caused to lift by the lifting device. For this reason , the upper tank and the lower tank can be firmly placed on the elevating device for the ladle and the transport cart for the ladle by interposing the gantry for the vacuum tank.

The vacuum tank pedestal includes a base part placed on the transport carriage, a support part placed on the base part and supporting the upper tank and the lower tank simultaneously or individually, and the position of the support part relative to the base part. to have a position adjusting device for adjusting. For this reason , when the upper tank and the lower tank are moved from the degassing processing position to the repairing position, the position of the support portion is adjusted by the position adjusting device to support the upper tank and the lower tank at the degassing processing position. By aligning the positions of the parts, the upper tank and the lower tank can be firmly placed on the support part. On the other hand, when the upper tank and the lower tank are returned from the repair position to the degassing processing position, the position of the support section is adjusted by the position adjusting device, so that the upper tank and the lower tank supported by the support section can be highly accurate. It can be returned to the degassing position.

Has a holding member for holding the upper tank in the vacuum degasser, a holding state where the holding member holds the upper tank, the holding member further comprise a holding release switching device for switching between the released state to release the upper tank Good. In this case, when the upper tank is moved from the degassing processing position to the repair position, the upper tank can be quickly transferred from the holding member to the lifting device by switching the holding state to the released state by the holding / release switching device. On the other hand, when the upper tank is returned from the repair position to the degassing processing position, the upper tank is raised to the degassing processing position by the lifting device, and then the release state is switched to the holding state by the holding / release switching device. The upper tank can be quickly delivered from the apparatus to the holding member.

The upper tank has a holding projection protruding sideways, and the holding / release switching device holds the holding projection from below by the holding member in the holding state, and below the holding projection in the releasing state. The holding member may be retracted from. In this case, in the holding state, the upper tank can be firmly held against gravity by holding the holding convex portion from below by the holding member. Further, the holding state can be switched to the released state only by retracting the holding member from below the holding convex portion. For this reason, the configuration of the hold / release switching device can be simplified. In the holding state, since the holding convex portion is pressed against the holding member, the holding member cannot be easily retracted from below the holding convex portion. On the other hand, by raising the upper tank by the lifting device, the holding member can be easily retracted from below the holding convex portion. Thus, cooperation between the holding / release switching device and the lifting / lowering device also contributes to simplification of the configuration of the holding / release switching device.

Vacuum tank replacement method according to the present invention includes a vacuum chamber including an upper chamber and a lower chamber, a vacuum chamber exchange method for exchanging a vacuum chamber of a vacuum degassing apparatus having a ladle, preparative frame for vacuum tank placed on the conveyance carriage used for conveying pot, simultaneously or individually placing the upper tank and the lower tank to the transport carriage via a frame for vacuum tank, simultaneously or separately transported to the upper tank and the lower tank by a transport carriage and, by the lifting apparatus used to lift the ladle, a large stroke than the stroke for lifting the ladle, the upper tank and the lower tank is simultaneously or individually lift, as frame for vacuum tank is placed on the conveyance carriage a base portion that, Ru used which has a support for supporting a top tank and a lower tank placed on the base portion simultaneously or separately, and a position adjusting device for adjusting the position of the support portion with respect to the base portion . According to this vacuum chamber replacement method, the vacuum chamber can be replaced with a few dedicated devices. Moreover, in a normal vacuum degassing apparatus, the ladle filled with molten steel is heavier than the vacuum tank. For this reason, the raising and lowering of the ladle, the raising and lowering device used for conveyance, and the conveyance carriage are used for exchanging the vacuum tank, so that the raising and lowering of the vacuum tank with sufficient driving force without increasing the size of the elevation and transportation carriage Transport can be performed.

In larger stroke than the stroke for lifting the ladle by the lifting device, Ru upper tank and lower tank by simultaneously or individually lift by the lifting device. Therefore, the upper tank disposed degassing position above the ladle and the lower tank by sufficiently lowered, the upper tank and the lower tank can easily be transported by the transport carriage.

Placing the vacuum-chamber platform to the conveyance carriage, simultaneously or individually placing the upper tank and the lower tank to the transport carriage via a frame for vacuum tank. For this reason , the upper tank and the lower tank can be firmly placed on the elevating device for the ladle and the transport cart for the ladle by interposing the gantry for the vacuum tank.

A base part placed on the transport carriage, a support part placed on the base part and supporting the upper tank and the lower tank simultaneously or individually, and a position adjusting device for adjusting the position of the support part relative to the base part; Ru with a vacuum chamber for stand having. For this reason , when the upper tank and the lower tank are moved from the degassing processing position to the repairing position, the position of the support portion is adjusted by the position adjusting device to support the upper tank and the lower tank at the degassing processing position. By aligning the positions of the parts, the upper tank and the lower tank can be firmly placed on the support part. On the other hand, when the upper tank and the lower tank are returned from the repair position to the degassing processing position, the position of the support section is adjusted by the position adjusting device, so that the upper tank and the lower tank supported by the support section can be highly accurate. It can be returned to the degassing position.

Has a holding member for holding the upper tank in the vacuum degassing apparatus, further using a holding state where the holding member holds the upper tank, a holding release switching device holding member to switch a release state releasing the upper tank, holding After the holding state is switched to the release state by the release switching device, the upper tank may be lowered by the lifting device, and after the upper tank is lifted by the lifting device, the release state may be switched to the holding state by the holding / release switching device. In this case, when the upper tank is moved from the degassing processing position to the repair position, the upper tank can be quickly transferred from the holding member to the lifting device by switching the holding state to the released state by the holding / release switching device. On the other hand, when the upper tank is returned from the repair position to the degassing processing position, the upper tank is raised to the degassing processing position by the lifting device, and then the release state is switched to the holding state by the holding / release switching device. The upper tank can be quickly delivered from the apparatus to the holding member.

A holding tank is used to hold the holding projection from below by the holding member in the holding state, and the holding member is retracted from below the holding projection in the released state, using an upper tank having a holding projection protruding sideways. When switching the holding state to the releasing state using the release switching device, after raising the upper tank by the lifting device, the holding member is retracted from below the holding convex portion, and when the releasing state is switched to the holding state May arrange the holding member below the holding projection and then lower the upper tank by the lifting device. In this case, in the holding state, the upper tank can be firmly held against gravity by holding the holding convex portion from below by the holding member. Further, the holding state can be switched to the released state only by retracting the holding member from below the holding convex portion. For this reason, the configuration of the hold / release switching device can be simplified. In the holding state, since the holding convex portion is pressed against the holding member, the holding member cannot be easily retracted from below the holding convex portion. On the other hand, by raising the upper tank by the lifting device, the holding member can be easily retracted from below the holding convex portion. Thus, cooperating the holding / release switching device and the lifting / lowering device also contributes to the simplification of the configuration of the holding / release switching device.

When the vacuum degassing processing is completed, the lifting body 19 is lowered, returning the ladle 3 on the pan support table 13b. Next, the ladle 3 is unloaded from the lower side of the vacuum chamber 2 by the transport carriage 10, and the ladle 3 on the transport carriage 10 is pulled up by the crane 12 and transported to the subsequent apparatus.

Next, as shown in FIG. 18, the holding member 32 is retracted from below the holding convex portion 6d (see FIG. 11). That is, the holding / release switching device 22 is switched from the holding state to the releasing state. Next, as shown in FIG. 19, the elevating body 19 is lowered and the vacuum chamber base 21 is placed on the vehicle body portion 13 of the transport carriage 10. As a result, the upper tank 6 is placed on the vehicle body 13 of the transport carriage 10 via the vacuum tank mount 21. By interposing the vacuum tank stand 21, the upper tank 6 can be firmly placed on the exchange carriage 10 for replacing the ladle 3. The lifting / lowering stroke of the lifting / lowering body 19 until the lifting / lowering body 19 is raised toward the upper tank 6 and the upper tank 6 is placed on the vehicle body 13 is the lifting / lowering stroke of the lifting / lowering body 19 when the ladle 3 is replaced. Bigger than that. That is, the lifting device 11 lowers the upper tank 6 with a stroke larger than the stroke for lifting the ladle 3. Thereby, the upper tank 6 arrange | positioned in the degassing process position above the ladle 3 is fully lowered | hung.

Claims (12)

A vacuum chamber exchange device for exchanging the vacuum chamber of a vacuum degassing device having a vacuum chamber and a ladle,
A transport carriage that is also used for transporting the ladle and transporting the vacuum chamber;
A vacuum chamber exchange apparatus comprising: a lifting device that is used for both conveying the ladle and lifting and lowering the vacuum chamber.   The vacuum chamber exchange device according to claim 1, wherein the lifting device lifts and lowers the vacuum chamber with a stroke larger than a stroke for lifting the ladle.   The vacuum chamber exchange apparatus of Claim 1 or 2 further equipped with the base for vacuum chambers mounted on the said conveyance trolley, supporting the said vacuum chamber, and being raised / lowered by the said raising / lowering apparatus.   The vacuum chamber pedestal includes a base portion that is placed on the transport carriage, a support portion that is placed on the base portion and supports the vacuum chamber, and adjusts the position of the support portion relative to the base portion. The vacuum chamber exchange device according to claim 3, further comprising a position adjusting device.   Holding release switch that has a holding member that holds the vacuum chamber in the vacuum degassing device, and switches between a holding state in which the holding member holds the vacuum chamber and a release state in which the holding member releases the vacuum chamber. The vacuum chamber exchange apparatus as described in any one of Claims 1-4 further equipped with an apparatus. The vacuum chamber has a holding projection protruding sideways,
6. The holding / release switching device holds the holding convex portion from below by the holding member in the holding state, and retracts the holding member from below the holding convex portion in the released state. Vacuum chamber changer. A vacuum chamber exchange method for exchanging the vacuum chamber of a vacuum degassing apparatus having a vacuum chamber and a ladle,
Transport the vacuum chamber by a transport carriage used for transporting the ladle,
The vacuum chamber exchange method which raises / lowers the said vacuum chamber with the raising / lowering apparatus used for raising / lowering of the said ladle.   The vacuum chamber replacement method according to claim 7, wherein the vacuum chamber is moved up and down by the lifting device with a stroke larger than a stroke for moving the ladle up and down by the lifting device.   The vacuum chamber replacement method according to claim 7 or 8, wherein a vacuum chamber pedestal supporting the vacuum chamber is placed on the transfer carriage, and the vacuum vessel is placed on the transfer carriage via the vacuum tank stand.   A base portion placed on the transport carriage; a support portion placed on the base portion and supporting the vacuum chamber; and a position adjusting device for adjusting a position of the support portion relative to the base portion. The vacuum chamber replacement method according to claim 9, wherein the vacuum chamber mount is used. Holding release switch that has a holding member that holds the vacuum chamber in the vacuum degassing device, and switches between a holding state in which the holding member holds the vacuum chamber and a release state in which the holding member releases the vacuum chamber. Further using the device,
The vacuum chamber is lowered by the lifting device after the holding state is switched to the released state by the holding / release switching device,
The vacuum chamber replacement method according to claim 7, wherein the release state is switched to the holding state by the holding / release switching device after the vacuum chamber is raised by the lifting device. Using the vacuum chamber having a holding projection protruding sideways,
In the holding state, the holding projection is held from below by the holding member, and in the release state, the holding / release switching device that retracts the holding member from below the holding projection,
When switching the holding state to the released state, after raising the vacuum chamber by the lifting device, the holding member is retracted from below the holding convex portion,
The vacuum chamber replacement method according to claim 11, wherein when the release state is switched to the holding state, the vacuum chamber is lowered by the lifting device after the holding member is disposed below the holding convex portion.

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