JP3448598B2 - Immersion tube attachment / detachment device for vacuum degasser - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment / detachment device for connecting a dip pipe to a lower part of a vacuum chamber and separating the same in a so-called suction type vacuum degassing device.

[0002]

2. Description of the Related Art Suction-type vacuum degassing (or vacuum refining) is the process of sucking molten steel in a ladle into a vacuum tank.
This is a method of refining by placing it in a vacuum atmosphere. Therefore, the vacuum degassing apparatus for performing such refining has a vacuum tank and also has a dip pipe (or a suction pipe) at the bottom of the vacuum tank as a means for sucking molten steel. In addition to the method of immersing two immersion pipes in the molten steel at the same time and then circulating the molten steel by blowing argon gas into one of them (RH method), the method of dipping one tube into and out of the molten steel (DH method) ).

The immersion pipe is immersed in high temperature molten steel, the inner wall is worn by the passing molten steel, and the slag adheres and grows on the outer wall. Therefore, it is necessary to replace it appropriately. Therefore, the immersion pipe is generally attached to the vacuum chamber through a pair of flanges so that they can be connected and disconnected, and the flanges are generally fastened with bolts and nuts or the like.

However, from the viewpoint of operating efficiency, it is preferable that the replacement is performed quickly, so that the connection between the vacuum chamber and the immersion tube is facilitated so that the immersion tube can be easily replaced even when the immersion tube is in a red hot (high temperature) state. There have already been various proposals regarding.
For example, Japanese Patent Publication No. 5-85610 discloses a technique in which a hoisting device such as a hoisting machine is provided on the side of a vacuum tank to lift the immersion tube, and a wedge operated by a hydraulic cylinder tightens and fixes the vacuum tank and the immersion tube. Is listed. In addition, Japanese Utility Model Laid-Open No. 58-83455 and Japanese Patent Laid-Open No. 58-1
In each of the publications of 85731, a plurality of cotters with inclined surfaces are arranged on one or both of the connection flanges of the vacuum tank and the immersion pipe, and a holding ring having an inclined surface matching the inclined surfaces on the inside is connected to one of them. A configuration is disclosed in which the flanges are covered with the outer side (both flanges are combined and then the sandwiching ring is rotated to clamp and fix the flanges).

[0005]

The conventional connecting means between the vacuum chamber and the dip tube has a problem in equipment cost and maintenance cost.
There is still room for improvement in terms of easiness of attachment / detachment of the dip tube and reliability of sealing of the connection part. For example, in the technique disclosed in Japanese Patent Publication No. 5-85610 mentioned above, (a) In order to introduce the connecting means, the vacuum degassing apparatus itself needs to be remodeled considerably, resulting in a considerable cost. This is because it is necessary to change the shape of the dipping pipe and to newly provide a suspension arm (a component for being lifted), which makes it difficult to divert an existing product.

(B) Since the suspension device, the hydraulic cylinder, the wedge, etc. must be provided for each vacuum tank, the equipment structure is complicated. For example, when replacing the whole or a part of the vacuum tank for the purpose of repair, if you replace the vacuum tank including the suspension device, the equipment cost will increase, and you will need to replace the original vacuum tank suspension device with the replacement vacuum tank. If it is transferred, complicated work is required and it takes a considerable amount of time. Besides, in order to replace the vacuum tank, it is necessary to reconnect the hydraulic oil supply pipe for the hydraulic cylinder, which is not easy work.

C) Since there is usually no space on the side of the vacuum chamber where a large number of relatively large devices such as a suspension device, hydraulic cylinder, and cotter can be placed, the immersion pipe is lifted and tightened and fixed. There are only a few places. Therefore, when the connection flange is thermally deformed or the like, the sealing property of the connection portion is likely to be deteriorated.

On the other hand, in the examples described in Japanese Utility Model Laid-Open No. 58-83455 and Japanese Patent Laid-Open No. 58-185731, d) the cotter and its inclined surface are deformed when the connecting flange or the holding tube is deformed due to heat or the like. Since the positional relationship of the cotters slightly changes, only a part of the cotters provided has a fastening force on the flanges, and the sealability between the flanges of other cotters is likely to deteriorate.

(E) If the deformation of the connection flange or the like is further increased, it becomes difficult to rotate the holding ring. Therefore, the dip tube cannot be attached to or removed from the vacuum chamber unless any measures are taken. There is a risk.

In the invention according to the present application, the connection between the vacuum chamber and the dipping pipe is performed so that the existing degassing device can be used without complicating the repair of the vacuum chamber, etc. The dipping pipe to be connected in this way is to be smoothly connected / disconnected by an attaching / detaching device having a simple structure.

[0011]

An immersion pipe attaching / detaching device in a vacuum degassing apparatus according to claim 1, wherein the immersion pipe is connected to a lower portion of a vacuum chamber in the vacuum degassing apparatus via a pair of flanges, In addition, a device for separating, the fastening means for exerting a fastening force to join the pair of flanges, independent of each other from the outer peripheral side to both flanges (that is, integrated with the vacuum tank or dip tube) (Not attached), the operating means for holding the tightening means and releasing the tightening force can be sequentially moved to the moving body portion of the moving means so as to sequentially move to the plurality of places to which the tightening means is attached. It is provided-is characterized.

The attaching / detaching device according to the first aspect is characterized by the following points. Firstly, the structure of the vacuum degassing device itself is hardly complicated in connection with connecting and disconnecting the vacuum tank and the immersion pipe in the vacuum degassing device. Since the vacuum tank and the immersion pipe are connected via a pair of flanges, the flanges are joined by an independent tightening means, so it is easy to join the vacuum tank and the immersion pipe by tightening means at most. This is because it is sufficient to modify the flange so that the shape of the flange is partially changed. Therefore, the conventional vacuum tank and the immersion tube can be used almost as they are, and the equipment cost is low. Further, even when the whole or a part of the vacuum chamber is replaced for repair or the like, there is no device to be transferred or reconnected to the vacuum chamber or the like, so that maintenance is not complicated. In addition, since a plurality of tightening means independently apply the tightening force to each location on such a flange, even if the flange is deformed to some extent due to heat, etc. And the sealing performance between the flanges is unlikely to deteriorate.

Secondly, this attachment / detachment device joins or separates the pair of flanges (that is, attachment / detachment of the immersion pipe to / from the vacuum chamber).
Can be done quickly and easily. The tightening means exerting a tightening force on both flanges is not inserted into the holes of both flanges but is attached to both flanges from the outer peripheral side thereof, and the operating means holds such tightening means. This is because the tightening force can be released. That is, the joining of both flanges can be performed by holding the tightening means by the operating means, releasing the tightening force, and then attaching the tightening means to both flanges from the outer peripheral side in that state to generate the tightening force again. On the contrary, the two flanges can be separated from each other by removing the tightening means from the outer peripheral side of the flange while holding the tightening means and releasing the tightening force.

Thirdly, since the operating means is provided in the moving body portion of the moving means and can be sequentially moved to a plurality of places to which the tightening means is attached, it is possible to join the flanges.
For separation, a plurality of tightening means can be operated sequentially by one operating means. Therefore, even when the number of tightening means is increased to strengthen the joint between the flanges, the number of operating means is less than the number of tightening means, and the attaching / detaching device is easily configured at low cost. Is
It is compact and can bring about an effect of saving space.

The attachment / detachment device according to a second aspect of the present invention is the first aspect.
Each part described in 1. is configured as follows.
First, it is assumed that the pair of flanges are open toward the outer periphery and have a plurality of groove-shaped notches that are continuous between the flanges at the time of joining. Further, the tightening means is a rod that can be inserted from the outer circumference of the flange into each of the notches, and the head of one end can be hung on the back surface of one flange, and the rod comes out from the back surface of the other flange. It is assumed that a spring that can expand and contract in the axial direction of the rod is attached together with a frame having an operation engaging portion for compressing and deforming the spring so that the spring does not come out. Further, a lever for holding the rod and applying a force for compressing and deforming the spring to the operating engaging portion of the frame is provided as the operating means.

In the attachment / detachment device of the present invention, each rod in the tightening means has a head portion for hanging on the back surface of one flange as described above, and a spring on the back surface side of the other flange. And the frame body so as not to slip out (that is, to generate a tightening force). Therefore, when the rod is fastened, the pair of flanges are clamped by the axial force (tension) of the rod by sandwiching the pair of flanges between the mounted spring and the frame and the head.

On the other hand, the above-mentioned pair of flanges are provided with a plurality of groove-shaped notches as holes through which the rods pass, and each of the notches is open toward the outer periphery as described above, and when the flanges are joined together. The rod can be continuously inserted between both flanges in a direction intersecting the joint surface. Therefore, as described above, the rod is not inserted into the holes of both flanges but is attached to both flanges from the outer peripheral side. When attaching the rods in this way, it is possible to previously form the head portion on each rod and attach the spring and the frame body in advance. Further, even when the rod is removed from the flange, it can be taken out with the head and springs formed and attached.

Further, in the case of this attaching / detaching device, the frame body is provided with an operating engaging portion for compressing and deforming the spring, and the operating means holds the rod and applies a force to the operating engaging portion. A lever for adding is provided. From the above points, according to this device, the space between the spring (or frame) and the head is widened by operating the operation engaging portion to compressively deform the spring, and then the rod (tightening) to the flange. Means) can be attached or detached. To operate the engagement part to compress and deform the spring, a force against the spring is required, but the necessary displacement is linear and simple, so the equipment required for operation is simple,
It is also possible to speed up the work. To attach and remove the rod, you can use a method such as fitting a nut as the head above and then shifting the position one by one to create a gap with the flange.In that case, turn the nut. Since it is not easy to make the fastening force constant or the fastening force is constant, problems remain in terms of speed of work and the like.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION One mode for carrying out the invention is shown in FIGS. FIG. 1 is a front view showing a vacuum degassing device 1 and an attaching / detaching device 2 for the immersion pipe 20. Figure 2
3 is a plan view generally showing the attaching / detaching device 2 and the like during operation, FIG.
Vacuum tank 10 of vacuum degassing apparatus 1 and immersion pipes 20A and 20B
FIG. 3 is a side view showing a connection state with the flange 11.2.
1 and the tightening means 30 thereof are drawn downward. 4 is a plan view (FIG. 4 (a)) and a front view (FIG. 4 (b)) showing the moving means 60 of the attachment / detachment device 2, and FIG. 5 is a plan view showing the operating means 50 together with the tightening means 30 (FIG. 5).
It is (a)) and a front view (the same (b)).

The vacuum degassing apparatus 1 is an apparatus for performing vacuum degassing by the so-called RH method, and as shown in FIG. 3, two immersion pipes 20A and 20B are connected to the lower part of the vacuum chamber 10.
The inside of the vacuum tank 10 is brought into a state close to a vacuum, and the immersion pipes 20A and 20B are immersed in molten steel (same) in a ladle (not shown) arranged below, and one immersion pipe 20A is filled with argon. When a gas is blown (not shown), the molten steel flows from the ladle into the dipping pipe 20 as the gas flows upward.
The circulation is performed by passing through A into the vacuum tank 10 and further through the dipping tube 20B to return to the ladle. Immersion tube 20A / 2
Since 0B is a consumable item and needs to be replaced periodically, the vacuum chamber 10 and the vacuum chamber 10 are separably connected by flanges 11 and 21. The flange 11 is integrally provided in the lower part of the vacuum chamber 10, and the flange 21 is integrally provided in the upper part with the dip tubes 20A and 20B.

In this embodiment, in order to connect and disconnect the dip tubes 20A and 20B with respect to the vacuum chamber 10 efficiently and easily, the above-mentioned flange 11 and
It has concluded between 21. That is, as shown in FIGS. 1 and 2, groove-shaped notches 12 and 22 that open toward the outer periphery are formed at six locations on a pair of flanges 11 and 21, and the flanges 11 and 21 are formed inside each of them. A rod 30 (tightening means) for applying a tightening force is attached to the. The notches 12 and 22 allow the cylindrical shaft 31 (see FIG. 3) of the rod 30 to pass through vertically,
In both cases, the shape in plan view is U-shaped as shown in FIG. 2, and the pair of joined flanges 11 and 21 is continuous vertically as shown in FIG. In addition, in order to join the flanges 11 and 21 in an appropriate positional relationship in which the notches 12 and 22 are continuous in the vertical direction as described above, a positioning protrusion (not shown) and a hole (same) are provided between the flanges 11 and 21. ) And are mutually established.

On the other hand, each rod 30 is centered on a shaft 31 having a large-diameter head portion 32 and a threaded portion at the tip end, as shown in the drawing portion of FIG. 3, and functions as a spring. Belleville spring 33 and frame 34 containing it
I am using the one that is assembled. The frame 34 is composed of a cylindrical portion for accommodating a plurality of disc springs 33 and a washer 34a that enters the disc spring 33 and rests on the disc spring 33. The cylindrical portion includes a bottom plate and a detachable device described later. The engaging portion 34p, which is a protrusion for being operated by 2, is integrally provided.
The disc spring 33 and the frame 34 are attached to the shaft 31 as shown in the figure, and a double nut 35 is fixed to the threaded portion of the shaft 31 to prevent them from coming off. Therefore, in each rod 30, the head 32 is hooked on the back surface of the flange 21 (that is, the lower end of the notch 22), while the bottom plate of the frame 34 is hooked on the back surface of the flange 11 (the upper end of the notch 12), and the disc spring 33 The flanges 31 and 21 are tightened by the shaft 31 with a force equal to the elastic repulsive force of.

Notch 12.2 opened to the outer periphery as described above
From using such a rod 30 for 2,
Fastening and releasing of the flanges 11 and 21 can be performed extremely efficiently. Rod 30 with disc spring 33, frame 34 and nut 35 attached to shaft 31
Can be fastened laterally from the outer circumference of the flanges 11 and 21 toward the inner side in the radial direction along the notches 12 and 22, and conversely, the fastening can be released by moving outwardly in the radial direction. is there. That is, in this vacuum degassing apparatus 1, the dip pipe 20A.
There is no annoyance of screwing the nut into the bolt each time the OB is attached or detached and adjusting the degree of tightening.

However, the dipping pipes 20A, 20
To attach and detach B, not only the rod 30 is moved as described above, but at the time of movement, the disc spring 33 is compressed and deformed for each rod 30 to widen the space between the head 32 and the frame 34, It is necessary to temporarily release the tightening force due to them. Therefore, in this example, the attachment / detachment device 2 is configured as shown in FIGS. 1 and 2 and the like, thereby releasing the tightening force of the rod 30 and holding the rod 30. Making it easy. The attachment / detachment device 2 is mainly a lever 50 (operating means) for compressing and deforming the disc spring 33 of each rod 30.
And a moving means 60 for each lever 50.
However, since the attachment / detachment device 2 assists the work performed by the worker and reduces the manual work, the moving means 60 is
It does not have a function of automatically moving the lever 50, but has a function of allowing the worker to move it easily. Details of the attachment / detachment device 2 are as follows.

As shown in FIG. 2, two sets of flanges 11 and 21 are provided.
6 have notches 12 and 22 at 6 places (12 places in total) and are fastened with the same number of rods 30, whereas the attaching / detaching device 2 has only two units in total. That is, the attachment / detachment device 2
Each of them includes a lever 50 and a moving means 60 thereof, and one set is provided on each side of the vacuum degassing apparatus 1 (a position sandwiching the two immersion pipes 20A and 20B). The number of the attaching / detaching devices 2 is smaller than the number of the rods 30 because the levers 50 of the attaching / detaching devices 2 are moved so that 6 sets of rods 30 (3 sets for each dipping tube) are sequentially attached to the respective levers 50. This is because it is operated by.

The lever 50 is provided on the engaging portion 3 of the frame 34 so as to contract the disc spring 33 with respect to the rod 30 shown in FIG.
4p or the like is operated to apply a compressive force to the disc spring 33. Structurally, as shown in FIGS. 5 (a) and 5 (b), two lower levers 51 that can hold the rod 30 by hooking the tips on the lower surfaces of the two engaging portions 34p of the frame 34, and the shaft 31 The upper lever 52 capable of holding the upper end of the upper lever 52 is swingably combined with a horizontal pin 53, and the rear end portions of the vertical levers 51 and 52 (the side separated from the above-mentioned front end portion by sandwiching the pin 53). Is provided with a portion for opening and closing drive.
As the opening / closing drive portion, two links 54 forming a so-called toggle mechanism are connected to the rear ends of the levers 51 and 52, and a link 57 pushed and pulled by a hydraulic cylinder 58 is connected to the links 54. When the hydraulic cylinder 58 is extended, the link 54 and the upper and lower levers 51 and 52 are displaced from the state of FIG. 5B, and the link 54 that constitutes the toggle mechanism.
Due to the force-increasing action of the lever and the action of the "lever" of the levers 51 and 52, the vertical distance between the tip portions is narrowed by a strong force. Therefore, the front end of the lower lever 51 is hung on the lower surfaces of the two engaging portions 34p of the frame 34, and the front end of the upper lever 52 is placed on the shaft 31 (see the pull-out portion in FIG. 3). When the hydraulic cylinder 58 is extended, the frame 34 can be pulled up toward the upper end of the shaft 31 and the disc spring 33 therein can be compressed and deformed.

Each lever 50 is provided at the tip (moving body portion 68) of the moving means 60 as shown in FIG. 4 so that the lever 50 can operate a plurality of rods 30. The lever 50 is attached to the tip portion 69 of such a moving body portion 68 so as to be swingable, and the tip portions of the lower lever 51 and the upper lever 52 (see FIG. 5) are located at the positions of the rods 30 (that is, at the respective cutting positions). The position of the notch 12/22) was reached.

The link mechanism shown in FIG.
8 has a function of always pointing vertically downward, whereby the horizontal posture of the lever 50 is maintained.

The link mechanism of FIG. 4 also includes a moving body portion 6
Despite the load acting on 8, the moving body portion 68
It also has the function of not lowering the height of.

In order to join or separate the flanges 11 and 21 by using the attaching / detaching device 2 as shown in FIG. 1, it is necessary to support the dipping pipes 20A and 20B in front of and behind the dipping pipe 20A.・ A proper mount (not shown) is used when attaching and detaching 20B. That is, the immersion pipe 20A
A pedestal capable of supporting 20B on the lower surface of the flange 21, for example, is mounted on a moving carriage (not shown) in an elevating manner, and when necessary, is placed directly below the dipping tube 20A or 20B is provided toward the vacuum chamber 10 or received from the vacuum chamber 10.

If the attaching / detaching device 2 is used, the immersion pipe 20A or 20B in the vacuum degassing device 1 can be attached / detached in the following manner. First, the case where the dip tube 20A (the same applies to the dip tube 20B) is attached to the lower part of the vacuum chamber 10 will be described. A new dip tube 20A placed on the above-mentioned mount (not shown) is attached by the mount. Work to stand on a work deck (not shown) in the vicinity of the vacuum tank 10 when it is inserted under the vacuum tank 10 and both flanges 11 and 21 are properly aligned and overlapped (see FIG. 1). The member causes each lever 50 (the tip of the lower lever 51) of the two attachment / detachment devices 2 to hold the rod 30.

A worker moves each lever 50 by holding the moving body portion 68 of the moving means 60, and the flange 11
The rod 30 is inserted into each of the notches 12 and 22 of 21 (see FIG. 5). At this time, in order to spread the space between the head portion 32 and the frame body 34 in the rod 30 to facilitate the insertion, the hydraulic cylinder 58 is extended in the lever 50, and the frame body 34 and the shaft are attached to the shafts at the tips of the upper and lower levers 51 and 52. A force is applied between the disc spring 33 and 31 to compressively deform the disc spring 33. Hydraulic cylinder 5
The extension / contraction of 8 is operated by a worker by a switch (not shown) provided near the lever 50.

The rod 30 extends to the depth of the cutouts 12 and 22.
When is entered, the cylinder 58 is contracted to release the force of the lever 50, and only the lever 50 is retracted by the moving means 60 leaving the rod 30 on the flanges 11 and 21.

While holding another rod 30 at the tip of the lever 50, another notch 12
The worker moves the lever 50 to the position 22 and repeats the above.

By the above, all the notches 12.2.
When the rod 30 is attached to 2, the attachment of the dip tube 20A to the vacuum chamber 10 is completed, so that the lever 50 is retracted and the mount is lowered.

On the other hand, when removing the dip tube 20A (similar to the dip tube 20B) from the vacuum chamber 10, first, the above-mentioned mount (not shown) is carried up to just below the dip tube 20A and the dip tube 20A is removed. When in the supporting state, the worker moves each lever 50 by holding the moving body portion 68 of the moving means 60 and the like, and engages the lever 50 with one of the rods 30 fastening the flanges 11 and 21. (See Figure 5). That is, the tip of the lower lever 51 is inserted under the two engaging portions 34p of the rod 30, and the tip of the upper lever 52 is positioned on the shaft 31.

In the lever 50, the hydraulic cylinder 58
And the force is applied between the frame 34 and the shaft 31 at each tip of the up and down levers 51 and 52 to compress and deform the disc spring 33, thereby expanding the space between the head 32 of the rod 30 and the frame 34. In that state, the lever 50 is moved backward by the moving means 60. As a result, one of the rods 30 that fastens the flanges 11 and 21 is removed.

After collecting the removed rod 30, the worker moves the lever 50 to the position of another rod 30 by using the moving means 60, and repeats the above steps.

All the rods 30 are attached to the flange 11.
When it is removed from between 21, the pedestal is lowered while supporting the immersion pipe 20A separated from the vacuum chamber 10, and the immersion pipe 20A is carried out from below the vacuum degassing apparatus 1 as it is.

Although one embodiment has been introduced above, it goes without saying that the present invention is not limited to this. For example, the moving means 60 is configured as a robot arm so that the lever 50 can move between the plurality of rods 30 by itself.
All the rods 30 may be attached and detached automatically (or by remote control). In addition, the link mechanism including the main links 64 and 66 is not provided so as to be rotatable with respect to the fixed member 61, but can be moved along a linear or curved guide rail (not shown) or the like. It may be provided. others,
The invention can also be implemented according to FIGS. 6-9, as described below.

FIG. 6 is a view showing a lever 100 which replaces the lever 50 (FIG. 5) described above. As shown in the drawing, the lower lever 101 and the upper lever 102 are connected at their bases by a gear 104, and one of them is connected to a rotary drive source 1 such as a hydraulic motor.
If it is connected to 08, the lever 100 will perform the necessary function for the rod 30 described above. Therefore, by substituting the lever 100 instead of the lever 50 into the attachment / detachment device 2, the immersion pipes 20A and 20B can be attached / detached smoothly.

FIGS. 7 (a) and 7 (b) show the attaching / detaching device 3 in which another moving means 110 is used in place of the above-mentioned moving means 60. That is, the moving means 110 is provided with the moving body portion 118 slidably along the one guide track 117 extending in the x-axis direction, and the guide track 117 is extended in the y-axis direction orthogonal to the x-axis. 111, and x
Guide track 114 extending in the direction of the z-axis orthogonal to the axis and the y-axis
Are connected so that they can move relative to each other.
Specifically, the base portion 1 of the horizontal guide rail 117 in the x-axis direction
16 is mounted on a vertical guide rail 114 in the z-axis direction, and a base 113 of the guide rail 114 is slidably mounted on a horizontal guide rail 111 in the y-axis direction. The lever 50 is swingably provided below the moving body portion 118 of the moving means 110. Between the mobile part 118 and the horizontal guideway 117, and the base 1
13 and the horizontal guide track 111 are also slidable so that an operator can easily move them relative to each other by hand, but between the vertical guide track 114 and the base 116 along the guide track 114, it is possible to resist gravity. A function of holding the position of the base portion 116 and moving the base portion 116 according to an operation of a worker by a switch or the like is added. Crossing guide track 117
Since the movable body portion 118 can be moved in each of the x-axis, y-axis, and z-axis directions via 111 and 114, the lever 50 can be moved to an arbitrary position within a certain three-dimensional space. Is possible.

FIGS. 8A and 8B show the attaching / detaching device 4 which also uses the moving means 120 instead of the moving means 60 described above. The moving means 120 lays a set of rails 121 circumferentially along the outer circumference of the flanges 11 and 21 of the vacuum degassing device 1, and arranges a carriage 123 so that the rails 121 can travel on the rails 121. The dolly 123
On top, the lifting mechanism 125 and the left and right sliding mechanism 12
The moving body portion 128 is provided via 6 in FIG. The moving body portion 128 moves on the rail 121 together with the carriage 123 in the circumferential direction of the flanges 11 and 21, and the lifting mechanism 125 moves.
Is moved up and down by the slide mechanism 126 and further in the radial direction of the flanges 11 and 21 by the slide mechanism 126. As a result, the lever 50 can take an arbitrary position in a three-dimensional space within a certain range, and each rod 30 can be attached / detached to join / separate the flanges 11/21.

FIG. 9 shows a hand truck type moving means 130.
It shows a form of using. That is, the attaching / detaching device 5 shown
The moving means 130 in (1) is one in which the moving body portion 138 to which the lever 50 is attached is mounted on the hand truck 131 via the lifting mechanism 135. A plurality of casters 132 including a swingable one is attached to the carriage 131, and a handle 133 for pushing by hand is provided, so that an operator can push and pull and carry it to an appropriate position. In this way, the worker horizontally moves the carriage 131,
In addition, since the height of the moving body portion 138 can be appropriately set by the elevating mechanism 135, the same work as in the above case can be performed by moving the lever 50 to an arbitrary position in the three-dimensional space.

[0045]

The apparatus for attaching / detaching the immersion pipe in the vacuum degassing apparatus according to the first aspect of the invention has the following effects.

1) Since the structure of the vacuum degassing apparatus itself is hardly complicated and the conventional vacuum tank and dip tube can be used almost as they are, it is economical.

2) Since there is no device that needs to be transferred or reconnected to the vacuum chamber or the like during repair or the like, the work of the repair or the like is easy.

3) Since the plurality of tightening means independently apply the tightening force to each position on the flange, the immersion pipe can be smoothly attached and detached even if the flange is slightly deformed by heat or the like, and the seal between the flanges can be achieved. It is hard to reduce the sex.

4) The tightening means for the flange is attached not from the hole of the flange or the like, but from the outer peripheral side thereof, and the operating means holds such tightening means to release the tightening force. Therefore, the flange can be joined and separated quickly and easily, and the work of attaching and detaching the dip tube can be efficiently advanced.

5) Since a plurality of tightening means can be sequentially operated by one operating means, the number of operating means can be reduced and the attaching / detaching device can be constructed at low cost in a simple and compact manner.

Further, in the case of the attaching / detaching device according to the second aspect, 6) the flanges can be joined and separated very quickly. The rod (tightening means) can be attached to the flange from the outer peripheral side of the flange, and at the time of attachment, the head can be formed on the rod in advance and a spring or frame can be attached. To be
It is possible to remove the rod from the flange while the head, spring, etc. are formed and attached, and it is possible to easily release the tightening force by the rod using the operating engagement portion or lever, Is the reason.

[Brief description of drawings]

FIG. 1 is a front view showing a vacuum degassing apparatus 1 and an attaching / detaching apparatus 2 for a dip tube 20 as an embodiment of the invention.

FIG. 2 is a plan view generally showing the attaching / detaching device 2 together with the vacuum degassing device 1, and is a view taken along the line II-II in FIG.

FIG. 3 is a side view showing a connection state between the vacuum chamber 10 and the immersion pipes 20A and 20B in the vacuum degassing apparatus 1. The details of the flanges 11 and 21 and the fastening means 30 are shown in the lower drawing portion.

4A is a plan view showing a moving means 60 of the attachment / detachment device 2, and FIG. 4B is a front view of the moving means 60.

5 (a) is a view showing the operation means 5 together with the tightening means 30. FIG.
It is a top view which shows 0, and the same (b) is a front view of them.

FIG. 6 is a schematic view showing a lever 100 as another embodiment of the invention.

FIG. 7 is a view showing an attaching / detaching device 3 different from that shown in FIG. 1 and the like as another embodiment of the invention, FIG. 7 (a) is a plan view, and FIG. 7 (b) is a front view.

FIG. 8 is a view showing a detaching device 4 which is different from that of FIG. 1 and the like as another embodiment of the invention, FIG. 8 (a) is a front view and FIG. 8 (b) is a plan view.

[Fig. 9] Similarly, another attaching / detaching device 5 different from that of Fig. 1 and the like.
FIG.

[Explanation of symbols]

1 Vacuum degasser 2, 3, 4, 5 attachment / detachment device 10 vacuum chamber 11.21 flange 12 ・ 22 Notch 20A / 20B immersion tube 30 rod (tightening means) 32 heads 33 Belleville spring 34 frame 34p Operation engaging part 50/100 lever (operation means) 60/110/120/130 Transportation 64.66 Main link 68 Moving body part

─────────────────────────────────────────────────── ─── Continuation of the front page (73) Patent holder 000001258 JFE Steel Co., Ltd. 2-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo (74) One agent above 100085291 Attorney Minoru Torinosu (one outside) (72) ) Inventor Masayuki Saito 3-1-1 Higashikawasaki-cho, Chuo-ku, Hyogo Prefecture Kawasaki Heavy Industries Ltd.Kobe factory (72) Inventor Seisuke Taizo 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture Kawasaki Heavy Industries Inside the Kobe Plant (72) Inventor Yoshinori Ueshima 1-chome, Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (no address) Kawasaki Steel Co., Ltd. Inside the Mizushima Steel Works (72) Hidemi Tsutsui 1 Kanazawa-machi, Kakogawa City, Hyogo Company Kado Steel Works, Kakogawa Works (72) Inventor Masashi Kawamoto, 3 Hikari, Hikaru, Kashima City, Ibaraki Prefecture Sumitomo Metal Industries, Ltd. Kashima Works (72) Inventor Naohiko Murakami 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) References JP-A-8-246034 (JP, A) JP-A-7-188730 (JP, A) JP-A-51-23407 (JP, A) JP-A-54-114665 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C21C 7/10

Claims (2)

(57) [Claims] 1. A device for connecting a dip pipe to a lower part of a vacuum chamber in a vacuum degassing device via a pair of flanges and for separating the dip pipe, and exerting a tightening force to join the pair of flanges. The tightening means shall be attached to both flanges from the outer peripheral side at a plurality of points as independent parts, and the operating means capable of holding the tightening means and releasing the above-mentioned tightening force should be attached to the plurality of points where the tightening means are attached. An immersion pipe attaching / detaching device in a vacuum degassing device, characterized in that it is provided in a moving body portion of a moving means so that it can be moved sequentially. 2. The pair of flanges has a plurality of groove-shaped notches that are open toward the outer periphery and that are continuous between the flanges when joined, and the tightening means is provided in each of the notches. A rod that can be inserted from the outer circumference of the flange, so that the head of one end can be hung on the rear surface of one flange, and a tightening force is generated at the part protruding from the rear surface of the other flange,
It is assumed that a spring expandable and contractible in the axial direction of the rod is attached together with a frame body having an operation engaging portion for compressing and deforming the spring, and as the operating means, the rod is held to operate the frame body. The immersion pipe attaching / detaching device in a vacuum degassing apparatus according to claim 1, wherein a lever for applying a force for compressing and deforming the spring is provided at the engaging portion for use in the vacuum degassing apparatus.