JP4987465B2 - Centering device and centering method for lower tank or intermediate tank - Google Patents

Description

  The present invention relates to a centering device and a centering method for a lower tank or an intermediate tank for aligning a lower tank or an intermediate tank attached to a vacuum tank used for secondary refining to the vacuum tank. Is.

  For example, in a vacuum degassing apparatus that performs a degassing process, which is a molten steel secondary refining process performed at a steel mill in an ironworks, it is referred to as a lower tank attached to the lower part of the vacuum tank of the vacuum degassing apparatus, and an intermediate ring. The intermediate tank is changed regularly. In such a case, it is necessary for the vacuum tank to ensure a strict degree of vacuum, and the vacuum tank and the lower tank or the intermediate tank are securely and firmly attached and fixed. The mounting flange provided at the upper part of is fixed and attached along the circumferential direction by a number of fastening fixing members such as bolts and nuts.

  Therefore, when a new lower tank or intermediate tank is fixed to the vacuum tank, the vacuum tank and the lower tank or intermediate tank are strictly aligned so that the fixing positions of the numerous bolts and nuts all coincide. There is a need.

  In this regard, for example, conventionally, a carriage that can be moved to a position directly below the mounting flange of the vacuum chamber, an elevator base that moves up and down on the carriage by the lifting means, and a front and rear, right and left movable on the elevator base. And a centering device having a slide table capable of holding the connecting pipe attached to the lower position of the vacuum chamber in an upright state, and a lateral movement means capable of moving the slide table in the front-rear and left-right directions. (Patent Document 1).

JP 2005-272889 A

  However, the centering apparatus described in Patent Document 1 basically has a lower tank installed on a slide table that moves in the XY direction, and the centering is performed by appropriately moving the slide table in the XY direction. Therefore, alignment in the θ direction, which is the rotational direction, cannot be structurally performed.

  As described above, in the alignment, the fixing positions of a large number of bolts and nuts set in the circumferential direction must all match, so even if the positions in the X and Y directions are matched, they are shifted in the θ direction. In such a case, these bolts and nuts cannot be fixed. For this reason, conventionally, when there is a deviation in the θ direction, an operator uses a tool such as a manually operated jack to adjust the lower tank on the slide table in the θ direction. However, since the lower tank and the intermediate tank have an extremely large mass, the adjustment work requires a considerable burden and time. In addition, since the position in the XY direction is determined only by the movement of the slide table by the hydraulic cylinder, it is necessary to accurately perform the alignment in the XY direction itself, which requires a corresponding time.

  This invention is made | formed in view of this point, and aims at performing the center alignment at the time of attaching a lower tank or an intermediate | middle tank to a vacuum tank more easily and quickly than before.

In order to achieve the above object, the present invention is an apparatus for aligning a lower tank or an intermediate tank attached to a vacuum tank used for secondary refining when the vacuum tank is attached to the vacuum tank. A carriage movable in the X direction below the tank; a lower frame installed on the carriage; an upper frame placed on the lower frame and placing the lower tank or the intermediate tank; An air bearing provided between the lower frame and the upper frame; a pressed portion fixed to the center of both side surfaces of the upper frame that are spaced apart in the X direction; and a space that is spaced in the X direction of the lower frame. Each of the two cylinder devices fixed to the opposite side surfaces and arranged so that the pressing portions face each other with the pressed portions interposed therebetween, and removal for guiding the upper frame in the Y direction with respect to the lower frame Yes and freely guide member, the It is characterized in Rukoto. Here, the X direction means a linear direction in which the carriage is set to be movable, and the Y direction means a direction orthogonal to the X direction on the horizontal plane .

According to the present invention, the alignment in the X direction is performed by moving the carriage. And since the air bearing is arranged between the upper frame and the lower frame on which the lower tank or the intermediate tank is placed, the air bearing is operated to expand in the vertical direction. The platform can be lifted from the lower platform. By operating the cylinder device in this state, alignment in the Y direction can be performed. At this time, the movement in the Y direction can be surely and smoothly performed by the guide member. And since the upper frame is in a state of floating from the lower frame via the air bearing , the upper frame can be easily moved in any direction by the operator's manual operation together with the lower tank by removing the guide member. . Therefore, adjustment in the θ direction is easy, and the centering operation can be performed much more simply and quickly than in the prior art. In addition, when the air bearing is operated and the upper frame is lifted from the lower frame, not only the θ direction but also movement in any direction including the X and Y directions can be adjusted. The alignment and the alignment in the Y direction of the cylinder device itself do not have to be strictly performed at that stage, and may be performed so as to be within the movable range allowed by the air bearing. Therefore, also in this respect, the work is easier than before, and the time required can be shortened.

  By providing a guide hole for guiding a guide pin provided at a predetermined position of the mounting flange of the vacuum tank at the upper part of the lower tank or the intermediate tank, it can be used as an index for alignment. Matching work can be performed more easily.

According to another aspect, the present invention is a method of aligning the lower tank or the intermediate tank with respect to the vacuum tank by using the lower tank or the intermediate tank centering device, wherein the lower frame And placing the upper frame on the carriage, placing the lower tank or the intermediate tank on the upper frame, and then moving the carriage below the vacuum tank and aligning in the X direction; Thereafter, the step of lifting the upper frame from the lower frame by operating the air bearing, the step of operating the cylinder device with the guide member attached, and performing the alignment in the Y direction, and then removing the guide member A step of moving the lower tank or the intermediate tank in the θ direction together with the upper frame in a state where the final positioning is performed. Here, the θ direction means the rotation direction.

  According to the centering method of the lower tank or the intermediate tank of the present invention having such characteristics, the centering operation can be carried out more easily and in a shorter time than in the prior art. According to the verification by the inventors, the time until the centering operation is completed after installing the lower tank or the like on the cart can be reduced to ½ or less of the conventional time.

  In the case of carrying out such a method, in the step of performing the alignment in the X direction and the step of performing the alignment in the Y direction, the deviation in the X direction and the Y direction with respect to the predetermined alignment position is preferably If the position is adjusted so that it is within a range of 50 mm or less, more preferably 20 mm or less, the final adjustment by human power after the air bearing is operated can be sufficiently aligned with a predetermined alignment position.

  According to the present invention, it is possible to perform centering when attaching a lower tank or an intermediate tank to a vacuum tank more easily and more quickly than in the past.

  Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 schematically shows a side surface of a centering device 1 according to an embodiment. A carriage 2 in this centering device 1 is composed of a base portion 4 having wheels 3 and a lifting mechanism 5. A table lifter 6 that can be freely moved from the section 4 is provided. The carriage 2 can travel in the X direction along a rail 8 installed on the floor surface 7 and can be stopped at an arbitrary position.

  On the upper surface of the table lifter 6 of the carriage 2, a lower frame 11 having a square shape in plan view is installed, and on the lower frame 11, an upper frame 12 having a square shape in plan view is placed. As shown in FIG. 2, eight supports 14 having compression springs 13 are provided on the upper surface of the upper frame 12 at predetermined intervals.

  In the space between the lower frame 11 and the upper frame 12, four air bearings 21 are provided. In the present embodiment, these air bearings 21 are attached to the lower surface side of the upper frame 12 via attachment plates 22. As the air bearing 21, various known air bearings can be used. In the present embodiment, the air bearing 21 is in a normal state, that is, in a contracted state, as shown in FIG. At the time of expansion, a rubber balloon structure having an elliptical cross section as shown in FIG. 4 is employed. As described above, the air bearing used in the present invention is made of rubber or synthetic resin, and preferably uses an expanding body that expands by supplying gas to the inside. However, the expanding body is not necessarily made of such rubber or synthetic resin. It is not limited to.

  In order to expand the air bearing 21, compressed air may be supplied into the air bearing 21 through the air supply pipe 23. The air bearing 21 is formed with a minute relief hole (not shown). When the air bearing 21 is in operation, the compressed air is always supplied, so that a small amount of air is leaked from the relief hole and the expanded state is maintained. The air in the air bearing 21 is released from the relief hole by stopping the supply of compressed air, and returns to the normal state, that is, the flat state.

  When compressed air is supplied into the air bearing 21, as shown in FIG. 4, the air bearing 21 expands in the vertical direction, and the upper frame 12 is lifted from the lower frame 11 by the pressure at that time.

  In the present embodiment, the four air bearings 21 are placed in the space between the lower frame 11 and the upper frame 12, but the number of air bearings 21 is arbitrary. Further, in the present embodiment, as shown in FIG. 2, compressed air is supplied to each air bearing 21 by an independent air supply pipe 23. It need not be supplied by the system.

  As shown in FIGS. 2 and 3, four hydraulic cylinders 31, 32, 33, and 34 are fixed to both sides of the lower mount 11 via brackets 35, 36, 37, and 38, respectively. Has been. If it demonstrates in detail, the to-be-pressed parts 39 and 40 are being fixed to the center of the both sides | surfaces of the upper mount frame 12. FIG. These pressed parts 39 and 40 have a form that hangs down from the upper frame 12 to the lower frame 11 side.

  For example, with respect to the pressed portion 39 side, the hydraulic cylinders 31 and 32 include pressing portions 31 a and 32 a provided on cylinder rods that are driven to expand and contract of the hydraulic cylinders 31 and 32 with the pressed portion 39 interposed therebetween. It arrange | positions so that it may oppose. Similarly, on the pressed portion 40 side, the hydraulic cylinders 33 and 34 are arranged so that the pressing portions 33 a and 34 a provided on the cylinder rods of the hydraulic cylinders 33 and 34 that are driven to extend and contract are opposed to each other.

  Linear guide grooves 41 and 42 are formed in the vicinity of one side end of the upper frame 12 along the Y direction orthogonal to the above-described X direction. For example, the guide groove 41 will be described with reference to FIG. As shown, the guide member 43 having the protruding portion 43a inserted into the guide groove 41 is temporarily fixed to the side end portion of the lower mount 11 at a position indicated by an arrow in the drawing. . By releasing the temporary fixing, the guide member 43 can be detached from the lower mount 11. As a temporary fixing means, an appropriate method such as a bolt or a pin can be adopted. Similarly, on the guide groove 42 side, the protruding portion of the guide member 44 temporarily fixed to the lower mount 11 is inserted.

  The centering device 1 according to the present embodiment has the above-described configuration. Next, a centering method using the centering device 1 will be described. First, as shown in FIG. 6, the lower frame 11 and the upper frame 12 are installed at predetermined positions on the table lifter 6 of the carriage 2 at the standby position, and then the lower tank 51 and the intermediate ring 52 to be newly installed are set on the upper side. Place on the gantry 12.

  In this example, the lower tank 51 and the intermediate ring 52 are integrally attached in advance, and a hook 54 of a crane is locked to the trunnion shaft 53 of the lower tank 51, and the upper pedestal 12 is predetermined by operation of the crane. It is supposed to be placed at the position. Then, the lower tank 51 is attached to each support 14 so that the upper part of each support 14 is inserted into a hole (not shown) formed in the lower face of the heat insulating plate 55 attached to the lower face of the lower tank 51. The lower tank 51 is placed on the upper gantry 12 by being supported by. At this time, the lower tank 51 is placed smoothly and horizontally by the compression spring 13.

  Next, the carriage 2 on which the lower tank 51 and the intermediate ring 52 are placed is moved in the X direction along the rail 8 and stopped at a predetermined position below the upper tank 61 of the vacuum tank as shown in FIG. In such a case, the stop position is preferably within a range of 50 mm or less, more preferably within a range of 20 mm or less with respect to the correct alignment position of the upper tank 61, the lower tank 51, and the intermediate ring 52. That is, as shown in FIG. 7, the displacement d in the X direction is preferably 50 mm or less, more preferably 20 mm or less.

  Next, at the stop position, the lifting mechanism 5 of the carriage 2 is operated to raise the table lifter 6. Then, as shown in FIG. 8, the worker 72 waiting on the suspension scaffold 71 can confirm the alignment state of the attachment flange 56 of the intermediate ring 52 and the attachment flange 62 of the upper tank 61. Then, the ascent of the table lifter 6 is stopped.

  In consideration of the confirmation of such alignment and the convenience of connecting the mounting flange 56 of the intermediate ring 52 and the mounting flange 62 of the upper tub 61 thereafter, as shown in FIG. Guide pins 63 are attached to a plurality of predetermined positions (centering positions) along the circumferential direction of the mounting flange 62, and guide holes 57 into which the guide pins 63 are guided and inserted into the mounting flange 56 of the intermediate ring 52 are provided. Once formed, it is very easy to work with.

  That is, the guide pin 63 provided on the mounting flange 62 of the upper tub 61 is formed with a small diameter at the tip 63a, while the guide hole 56 into which the guide pin 63 is guided and inserted has a tapered shape on the upper side. An opening 57a is formed. By providing the guide pin 63 and the guide hole 57 as described above, when confirming the alignment state, the distal end portion 63a of the guide pin 63 is positioned in the range above the opening 57a of the guide hole 57 in the X direction, Further, it is only necessary to adjust the intermediate ring 52 side by moving in the Y direction and the θ direction by the method described later, and the tip portion 63a of the guide pin 63 is positioned above the opening portion 57a of the guide hole 57 as such. If the alignment can be adjusted within the range, then the table lifter 6 is raised as it is, and the intermediate ring 52 and the lower tank 51 are raised, whereby the entire guide pin 63 is guided into the guide hole 57, and the intermediate ring 52, The lower tank 51 is guided to the correct centering position with the upper tank 61.

  As described above, when the alignment in the X direction within the predetermined range (the range d is 50 mm or less, for example) due to the movement of the carriage 2 is completed, the alignment operation in the Y direction is performed next.

  In performing the alignment operation in the Y direction, first, compressed air is supplied to the air bearing 21 disposed between the upper frame 12 and the lower frame 11. Then, as shown in FIG. 4, the air bearing 21 expands downward, and the upper frame 12 is lifted from the lower frame 11 by the pressure at that time. In this state, the upper gantry 12 is lifted from the lower gantry 11 via the air bearing 21. As a result, the frictional resistance is extremely small, and the upper gantry 12 is pushed in an arbitrary direction by human power. Alternatively, it can be rotated in the θ direction.

  In this state, the hydraulic cylinders 31, 32, 33, and 34 are operated to move the upper frame 12 in the Y direction, thereby aligning the intermediate ring 52 and the lower tank 51 in the Y direction. That is, for example, referring to FIG. 2, when the upper frame 12 is moved in the negative Y direction (downward in the figure) indicated by the thick arrow, the hydraulic cylinders 32 and 34 are operated, The pressed portions 39 and 40 provided on both sides of the upper gantry 12 are pressed in the negative direction in the Y direction (downward in the drawing) by the pressing portions 32a and 34a. If it does so, the upper frame 12 will move to the negative direction of a Y direction according to the stroke amount of the press parts 32a and 34a with the intermediate ring 52 and the lower tank 51 which are mounted.

  In this case, as described above, the upper frame 12 is lifted from the lower frame 11 via the air bearing 21 and can be pushed in any direction by human power. Movement in the direction is very easy.

  In addition, in the present embodiment, guide grooves 41 and 42 along the Y direction are formed on the upper surface of the upper frame 12, and guide members 43 and 44 provided on the lower frame 11 are formed in the guide grooves 41 and 42. Since the protrusions 43a and the like are inserted, the upper frame 12 can be moved correctly and smoothly in the Y direction along the guide grooves 41 and 42. When the upper frame 12 is moved in the positive Y direction (upward in the figure), the hydraulic cylinders 31 and 33 are operated to move the pressed parts 39 and 40 in the positive Y direction (FIG. 2). What is necessary is just to press downward.

  In the alignment by the movement of the upper gantry 12 in the Y direction by the hydraulic cylinders 31, 32, 33, and 34, the amount of deviation is preferably in the range of 50 mm or less, more preferably 20 mm or less with respect to the correct alignment position. It may be performed within the range of.

  When the alignment in the Y direction is thus completed, the guide members 43 and 44 are removed. Thereafter, the operator 72 on the suspension scaffold 71 can move the intermediate ring 52 and the lower tank 51 in the θ direction by manually pushing or rotating the intermediate ring 52 and the like by hand. In this case, since the upper frame 12 is lifted from the lower frame 11 via the air bearing 21, the intermediate ring 52 and the lower tank 51 can be easily moved not only in the θ direction but also in the X direction and the Y direction. Can be moved.

  By such final position alignment by manual work by the worker 72, the centering of the intermediate ring 52 and the lower tank 51 with respect to the upper tank 62 can be performed.

  As described above, according to the present embodiment, since the alignment in the θ direction can be easily performed by the manual operation of the worker, such a θ direction that has been conventionally performed using a tool such as a jack. Can be performed very easily and quickly. Further, in the alignment in the θ direction after the alignment in the X direction and the Y direction, since the movement in the X direction and the Y direction is possible, the alignment accuracy in the X direction due to the movement of the carriage 2 and the hydraulic pressure The Y-direction alignment accuracy by the cylinders 31, 32, 33, 34 should be ensured so that the amount of misalignment with respect to the correct center alignment position is preferably 50 mm or less. Can be done. Therefore, the centering of the intermediate ring 52 and the lower tank 51 with respect to the upper tank 62 can be performed in a much shorter time than in the past.

  In the above embodiment, the intermediate ring 52 and the lower tank 51 are integrated with each other. However, the present invention is not limited to the case where only the intermediate ring 52 and the lower tank 51 are used. Can be implemented.

  INDUSTRIAL APPLICABILITY The present invention is useful for the centering work of a structure having a large mass such as a lower tank and an intermediate tank attached under a vacuum tank used for secondary refining, and a dip tube.

It is the side view which showed typically the centering apparatus concerning embodiment. It is the top view which showed typically the center alignment apparatus concerning embodiment. It is the side view which showed typically the upper frame and lower frame of the center alignment apparatus concerning embodiment when the air bearing is not act | operating. It is sectional drawing of the side which showed typically the upper frame and the lower frame of the center alignment apparatus concerning embodiment when an air bearing act | operates. It is a longitudinal cross-sectional view of the principal part of the guide member in the center alignment apparatus concerning embodiment. It is a side view which shows a mode that the intermediate ring and the lower tank are suspended with the crane on the upper frame of the center alignment apparatus concerning embodiment. It is a side view which shows a mode that the centering apparatus concerning embodiment was moved below the upper tank. It is a side view which shows the mode after raising the centering apparatus concerning embodiment toward an upper tank. It is a longitudinal cross-sectional view of the principal part which shows the guide pin formed in the attachment flange of an intermediate ring and the guide pin provided in the attachment flange of the upper tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center alignment apparatus 2 Cargo 6 Table lifter 11 Lower mount 12 Upper mount 21 Air bearing 31, 32, 33, 34 Hydraulic cylinder 39, 40 Pressed part 41, 42 Guide groove 43, 44 Guide member 51 Lower tank 52 Intermediate ring 56 Mounting flange 61 Upper tank 62 Mounting flange

Claims (4)

An apparatus for aligning a lower tank or an intermediate tank attached to a vacuum tank used for secondary refining to the vacuum tank,
A carriage movable in the X direction below the vacuum chamber;
A lower frame installed on the carriage;
An upper frame placed on the lower frame and placing the lower tank or the intermediate tank;
An air bearing provided between the lower frame and the upper frame;
A pressed portion fixed to the center of each of both side surfaces spaced apart in the X direction of the upper frame;
Each of the two cylinder devices fixed to both side surfaces spaced apart in the X direction of the lower pedestal, and disposed so that the pressing portions face each other across the pressed portions;
A detachable guide member for guiding the upper frame in the Y direction with respect to the lower frame;
A centering device for a lower tank or an intermediate tank, characterized by comprising:
Here, the X direction means a linear direction in which the carriage is set to be movable, and the Y direction means a direction orthogonal to the X direction on the horizontal plane . The upper portion of the lower tank or intermediate tank, characterized in that the guide hole guide pin provided at a predetermined position of the mounting flange of the vacuum chamber is guided is provided, the lower portion of claim 1 Centering device for tank or intermediate tank. With centering device of the lower tank or intermediate tank according to claim 1 or 2, the lower tank or the intermediate tank there is provided a method for centering relative to the vacuum chamber,
Installing the lower frame and the upper frame on a carriage, and placing a lower tank or an intermediate tank on the upper frame;
And then moving the carriage below the vacuum chamber to align in the X direction;
And then actuating the air bearing to lift the upper frame from the lower frame;
Thereafter , the cylinder device is operated with the guide member attached, and the Y-direction alignment is performed.
Thereafter, with the guide member removed, the step of moving the lower tank or the intermediate tank together with the upper frame in the θ direction to perform final positioning;
A method for aligning the lower tank or the intermediate tank, characterized by comprising:
Here, the θ direction means the rotation direction. In the step of performing the alignment in the X direction and the step of performing the alignment in the Y direction, the alignment is performed so that the amount of deviation in the X direction and the Y direction with respect to a predetermined center alignment position is in a range of 50 mm or less. The centering method of the lower tank or the intermediate tank according to claim 3 , wherein

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