JP2507459Y2 - Sealing structure for connection of pressurized metal melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a seal structure for a connection part of a pressure type metal melting furnace, and more particularly to a furnace used for melting, refining or smelting reduction of metal, In a metal melting furnace (electric furnace, converter, various refining furnaces, smelting reduction furnace, etc.) of the type that moves or tilts, a connecting part seal that connects a pressure head and a tubular member connected to the furnace opening and opening It is about structure.

[Prior art]

In the pressure-type metal melting furnace, various gases that are toxic or harmful are generated during operation, so the furnace opening of the metal melting furnace is a pressure head for sealing the gas,
A pressure head, to which a duct or the like for guiding gas to an external gas treatment facility is connected, is connected in an airtight manner and is separable.

In order to feed raw materials into the metal melting furnace, a chute member is airtightly and separably connected to the pressing head and the chute opening of the furnace body.

For example, in a smelting reduction ironmaking plant, a preliminary reduction furnace for pre-reducing iron ore and a granular preliminary reduction iron ore raw material supplied from this preliminary reduction furnace are subjected to smelting reduction and preliminary reduction while adding lime, coal and air. A melting reduction furnace that generates a reducing gas (CO, CO ₂ , H ₂ , H ₂ O, etc.) to be supplied to the furnace is provided. Gas pressure in this smelting reduction furnace is 2-3k
g / cm ² , capacity is, for example, about 100-200 m ³ , the diameter of the furnace mouth is, for example, 3-4 m, to supply hot metal as the initial heat source at the start of operation, and to repair the refractory material on the inner wall of the furnace Therefore, the skirt structure of the pressing head is airtightly and separably fastened to the furnace port flange by the fastening device.

As a pressure head connecting portion sealing structure suitable for a metal melting furnace such as the above-mentioned smelting reduction furnace, the applicant of the present application has disclosed in Japanese Patent Laid-Open No. 1-272606
Japanese Patent Laid-Open No. 1-252891 and Japanese Patent Laid-Open No. 1-252891 have been proposed.

Explaining the pressure head connecting portion sealing structure described in the latter publication, the pressure head has a main hood suspended on an external frame and a skirt structure externally fitted to the main hood so as to be vertically movable. The skirt structure includes the above flange, a lower flange, and a metal expansion / contraction sleeve stretched between the upper and lower flanges, and the frame supporting the main hood is provided with a skirt lifting mechanism composed of a number of hydraulic cylinders. A heat-resistant packing is sandwiched between the lower flange and the furnace opening flange underneath, and many fastening mechanisms for fastening the lower flange to the furnace opening flange are provided around the furnace opening. It is composed of a special fastening bolt to be inserted and a motor (hydraulic motor) for raising and lowering the fastening bolt through a nut and driving the fastening.

On the other hand, in Japanese Patent Laid-Open No. 1-198414, a chute insertion opening is formed in the shoulder of the furnace body of the smelting reduction furnace, and a lid for opening and closing the opening and a lid opening / closing mechanism are provided. It is described that a charging chute can be inserted. However, there is no description about the seal structure in the state where the chute is inserted.

A semi-fixed flange-to-flange connection structure is usually used as the connection structure for connecting the raw material charging chute to the furnace body or the pressure head in an airtight manner, and the connection is made in an airtight and separable manner. The structure has hardly been put to practical use.

[Problems to be solved by the device]

In the above-mentioned pressure head connection part seal structure, since the heat resistant packing is constantly and strongly fastened by a large number of fastening mechanisms, and vibration etc. occurs in the furnace body, the packing is easily worn out, and reliability and durability are improved. There is a problem of lacking.

In the case of a large metal melting furnace, 20 to 30 fastening mechanisms are provided to equalize the fastening force over the entire circumference, but each mechanism has many parts such as hydraulic motors, nuts, fastening bolts, etc.
Since the number of fastening mechanisms is large and the hydraulic pressure supply system is large and complicated, the overall manufacturing cost will be very high.
Further, since it is desirable to drive all of the fastening mechanisms substantially in synchronization at the time of fastening, there are problems that the fastening operation is complicated, the time required for fastening and releasing is long, and the operating rate of the metal melting furnace is reduced.

Further, since the hydraulic motors of many fastening mechanisms are arranged on the lower flange that is fastened to the furnace opening flange, and each hydraulic motor occupies a considerable space, the furnace opening flange and the lower flange are large and thick. There is also the problem of fleshing out.

The purpose of the present invention is a sealing structure for connecting a pressurizing head and a chute cylinder member to a furnace opening and a chute opening of a pressurizing type metal melting furnace in an airtight and separable manner. -To provide a connection part seal structure that is excellent in operability, has a simple structure, and is advantageous in terms of equipment cost.

[Means for solving the problem]

A connection part seal structure for a pressure type metal melting furnace according to a first aspect is a connection part seal structure for connecting a pressure head, which is hermetically and separably connected to a furnace opening of a pressure type metal melting furnace, to a furnace opening flange. In the above, the upper flange that is fitted to the peripheral wall portion of the pressure head in an airtight manner and is capable of moving up and down, the lower flange that abuts on the upper surface of the furnace port flange, and the both of these are provided between the upper flange and the lower flange. An elastic sleeve made of metal whose upper and lower ends are hermetically fixed to the flange, a sealing means for sealing between the lower flange and the furnace opening flange on the smaller diameter side of the elastic sleeve, and the upper and lower flanges. And an elevating means for elevating and lowering the lower flange with the gas pressure in the furnace to press the lower flange against the furnace opening flange with a pressing force acting on the expandable sleeve and the lower flange.

According to a second aspect of the present invention, there is provided a connection part seal structure for connecting a pressurizing head, which is hermetically and separably connected to a furnace opening of a pressurization type metal melting furnace, to a furnace opening flange. In the above, the upper flange externally fitted to the peripheral wall portion of the pressurizing head in an airtight manner and capable of moving up and down, the lower flange abutting on the upper surface of the furnace opening francy, and the both of these disposed between the upper flange and the lower flange. The upper and lower flanges and the expandable sleeve are defined by a metal expandable sleeve whose upper and lower ends are fixed to the flange in an airtight manner, and an upper and lower flange and an expandable sleeve via a sleeve part of the upper flange and a sleeve part of the lower flange. An annular chamber, a sealing means for sealing between the lower flange and the furnace port flange on the smaller diameter side of the expansion sleeve, and an elevating means for elevating the upper and lower flanges. Under a pressure acting on slidable sleeve and the lower flange by the gas pressure of the supplied pressurized gas from the outside it is obtained by configured to press the lower flange to the furnace opening flange.

According to a third aspect of the present invention, there is provided a sealing structure for a connection part of a pressure type metal melting furnace which connects a tubular member, which is hermetically and separably connected to an opening part of the pressure type metal melting furnace, to an opening flange on a furnace body side. In the seal structure, a support flange externally fitted and fixed to the tubular member in an airtight manner, a movable flange abutting on the upper surface of the opening flange, and an upper end portion of both of the flanges disposed between the support flange and the movable flange. An elastic sleeve made of metal whose lower end portions are fixed to each other in an airtight manner, a sealing means for sealing between the movable flange and the opening flange on the smaller diameter side than the elastic sleeve, and an elevating means for elevating the movable flange. It is configured such that the movable flange is pressed against the opening flange by the pressing force acting on the expandable sleeve and the movable flange by the gas pressure in the furnace.

According to a fourth aspect of the present invention, there is provided a connection part seal structure for a pressurization type metal melting furnace in which a tubular member which is connected to an opening part of the pressurization type metal melting furnace in an airtight and separable manner is connected to an opening flange on a furnace body side. In the seal structure, a support flange externally fitted and fixed to the tubular member in an airtight manner, a movable flange abutting on the upper surface of the opening flange, and an upper end portion of both of the flanges disposed between the support flange and the movable flange. An elastic sleeve made of metal, the lower end portion of which is hermetically fixed to each other; a sleeve member which is internally fitted and fixed to a movable flange inside the elastic sleeve and whose upper end portion is airtightly slidably fitted to a tubular member; An annular chamber defined by both flanges, a telescopic sleeve, a sleeve member and a tubular member, a sealing means for sealing between the movable flange and the opening flange on the smaller diameter side than the telescopic sleeve, and a movable flap. And an elevating means for elevating the sleeve member, and the movable flange is pressed against the opening flange by the pressing force acting on the expandable sleeve and the movable flange by the pressure of the pressurized gas supplied to the annular chamber from the outside. It is configured as follows.

[Action]

In the sealing structure for the connection part of the pressure type metal melting furnace according to the first aspect, when the connection of the pressure head is separated, the upper and lower flanges are raised by the elevating means and the pressure head is connected to the furnace opening. When this is done, the upper and lower flanges are lowered by the elevating means, and the lower flange is brought into contact with the furnace port flange. Since the sealing means for sealing between the lower flange and the furnace opening flange is arranged on the smaller diameter side than the expandable sleeve, the lower flange has a gas pressure received on the upper surface and a gas pressure received on the lower surface due to the gas pressure in the furnace. The pressure applied by the differential force and the gas pressure in the furnace act on the expandable sleeve, and the pressure applied on the lower flange presses the lower flange against the furnace port flange, thus ensuring the sealing performance of the sealing means. The above-mentioned pressurizing force increases and decreases according to the level of the gas pressure in the furnace, and the pressurizing force does not become unnecessarily excessive, so that the sealing means does not become sagging and the reliability and durability are excellent.

It has a simple structure that effectively utilizes the expandable sleeve provided to connect the pressurizing head to the furnace port separably and devises the positional relationship between the expandable sleeve and the sealing means. It is extremely cheap compared to the device.

In addition, connection and disconnection of the pressure head can be efficiently performed by a simple operation via the elevating means, and the lower flange and the furnace port flange do not become large.

According to the second aspect of the present invention, there is provided an annular chamber defined by the upper and lower flanges and the telescopic sleeve via the sleeve portion of the upper flange and the sleeve portion of the lower flange. Pressurized gas is supplied to the annular chamber from the outside, and the lower flange is pressed against the furnace port flange by the pressurizing force acting on the lower flange and the expandable sleeve by the gas pressure. The pressing force can be set to a desired value depending on the pressure of the pressurized gas, and the expansion sleeve can be thermally protected by the sleeve portions of the upper and lower flanges and the pressurized gas of the annular chamber. The operation other than this is the same as that of the first claim.

According to the third aspect of the present invention, there is provided a seal structure for a pressurizing type metal melting furnace in which the movable flanged is raised by the elevating means when disconnecting the connection of the tubular member, and movable by the elevating means when connecting the tubular member to the opening. The flange is lowered to bring the movable flange into contact with the opening flange.
The principle of generating the pressing force that presses the movable flange toward the opening flange is the same as in the first aspect.

In addition, the structure is simple, the manufacturing cost is low, and the connection and disconnection can be performed efficiently by simple operations.
The same applies to the first claim.

In the sealing structure for the connection part of the pressurized metal melting furnace according to the fourth aspect, connection and disconnection of the tubular member are the same as those of the third aspect.

The sleeve member provided on the inner side of the expandable sleeve exerts the effect of thermally protecting the expandable sleeve and the function of defining the inner peripheral side of the annular chamber.

Pressurized gas is supplied to the annular chamber from the outside, and a pressure is applied to the expandable sleeve and the movable flange by the gas pressure, and the movable flange is pressed against the opening flange by the pressing force. The pressing force can be set to a desired value depending on the pressure, and the expansion sleeve can be thermally protected by the pressurized gas in the annular chamber.

 Other functions are the same as those in the third claim.

[Effect of device]

According to the connection part seal structure of the pressurization type metal melting furnace according to the first aspect, as described in the above [Operation],
(1) The pressing force that presses the lower flange against the furnace port flange is generated by the gas pressure in the furnace, so that the seal structure has excellent reliability and durability, and (2) the operation of connecting and disconnecting the pressure head is easy. In addition, the following effects can be achieved: (1) it can be performed efficiently, (3) the number of parts is small and the structure is simple, and the manufacturing cost can be remarkably reduced, and (4) the lower flange and the throat flange can be downsized.

According to the connection part seal structure of the pressure type metal melting furnace according to the second aspect, as described in the above [Operation],
(1) Since the pressing force for pressing the lower flange against the furnace port flange is generated by the gas pressure of the pressurized gas supplied to the annular chamber, (1) expansion and contraction due to the heat insulating action of the sleeve portion and the heat insulating action of the annular chamber. The sleeve can be protected thermally, and its durability can be improved. (2) Reliability and durability because the pressing force that presses the movable flange against the opening flange is generated by the gas pressure of the pressurized gas supplied from the outside to the annular chamber. (3) The pressing force can be freely set by appropriately setting the gas pressure of the pressurized gas, and the furnace gas pressure is restricted even when the furnace gas pressure is low. The desired pressing force can be set without having to do so, and the same effects as (2), (3), and (4) of the first claim can be obtained.

According to the connection part seal structure of the pressurization type metal melting furnace according to the third aspect, as described in the above [Operation],
(1) Since a pressing force that presses the movable flange against the opening flange is generated by the gas pressure in the furnace, a seal structure having excellent reliability and durability is obtained. (2) Connection and disconnection operations of the tubular members are simple and efficient. And (3) the manufacturing cost is extremely low because the number of parts is small and the structure is simple.

According to the sealing structure for the connection part of the pressurizing type metal melting furnace according to the fourth aspect, (1) the expansion sleeve can be thermally protected by the heat shield effect of the sleeve member and the heat shield effect of the annular chamber, and its durability. (2) A sealing structure having excellent reliability and durability can be obtained because (2) the pressing force for pressing the movable flange against the opening flange is generated by the gas pressure of the pressurized gas supplied from the outside to the annular chamber, (3 ) It is possible to freely set the pressing force by appropriately setting the gas pressure of the pressurized gas, and to set a desired pressing force without being restricted by the furnace gas pressure even when the furnace gas pressure is low, etc. And the same effects as (3) and (2) of the third claim.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is an example of applying the present invention to a smelting reduction furnace of a smelting reduction ironmaking plant.

As shown in FIG. 1, the smelting reduction furnace 1 is basically composed of a furnace body 10 and a pressure head which is detachably fastened to a furnace port 11.
It has 20 and.

The furnace body 10 has a structure in which a refractory material 13 is lined inside a steel shell 12, a furnace opening 11 is formed at the upper end of the furnace body 12, and an annular furnace opening flange 14 is provided. Hot metal M
A tap hole 15 for tapping is provided. However, the furnace body 10
There is also a case where a taphole is formed in the side wall near the bottom of the. The furnace body 10 is supported by a trunnion so that it can be tilted (rotated) around a horizontal support shaft as in a normal converter.

The pressure head 20 includes a cylindrical peripheral wall portion 21 formed by lining a steel 22 with a refractory material 23, a steel upper wall portion 24 having a water cooling jacket structure that closes the upper end of the peripheral wall portion 21, and a lower portion of the peripheral wall portion 21. And a skirt structure 30 that can be lifted up and down. The peripheral wall portion 21 and the upper wall portion 24 correspond to the main hood.

A lance 25 for supplying pressurized air or oxygen gas and a sublance 26 for sampling are attached to the upper wall portion 24 of the pressure head 20, and a charging chute 27 for charging a raw material is provided on the peripheral wall portion 21. A gas duct 28 is attached.

At the start of refining, the fastening of the pressure head 20 to the furnace opening flange 14 is released to raise the skirt structure 30 and
While tilting the furnace main body 10 in a state in which it is laterally moved by a dolly (not shown), the hot metal M as an initial heat source, lime, coal, etc. are charged into the furnace main body 10 and then the pressure head 20 is fastened. The granular iron ore material preliminarily reduced in the preliminary reduction furnace (not shown) is supplied from the charging chute 27 and pressurized air is supplied from the lance 25 to melt the combustion heat of the coal as a heat source. reducing gas generated in the furnace body 10 with reducing _{(CO, CO 2, H 2} , H 2 O , etc.) (gas pressure 2-3 kg / cm
² ) is supplied to the preliminary reduction furnace via the gas duct 28. In this way, after the smelting reduction treatment, the fastening of the pressure head 20 is released again, the skirt structure 30 is lifted and the pressure head 20 is moved to the side, and then the furnace body 10 is tilted and the hot metal M is discharged from the tap hole 15.
Go out. The refractory material 13 is often repaired when the furnace body 10 has cooled after the tapping is completed.

Next, the skirt structure 30 of the pressure head 20 and the pressure head fastening device 40 for fastening the pressure head 20 to the furnace port flange 14.
The seal structure of the pressure head connecting portion will be described.

As shown in FIGS. 2 and 3, the peripheral wall portion of the pressure head 20.
A cylindrical member 31 made of thick-walled steel is attached to the outer peripheral portion of the lower portion of 21, and an upper flange 32 is fitted on the cylindrical member 31 so as to be vertically movable. The upper flange 32 has a sleeve portion 32a that is fitted to the cylindrical member 31 via a heat-resistant packing 33 in an airtight manner,
It is composed of a thick annular ring flange portion 32b extending horizontally from the upper end of the sleeve portion 32a.

A lower flange 34 is externally fitted on the sleeve portion 32a of the upper flange 32 so as to be vertically movable. The lower flange 34 is composed of a sleeve portion 34a that is airtightly fitted to the sleeve portion 32a via a heat-resistant packing 35, and a thick annular flange portion 34b that extends horizontally outward from the lower end of the sleeve portion 34a,
The flange portion 34b is disposed above the furnace opening flange 14 in an opposed manner, and a heat-resistant alloy steel expansion sleeve 36 is disposed between the flange portion 32b and the flange portion 34b, and the upper end portion of the expansion sleeve 36 is attached to the flange portion 32b. The expansion sleeve 36 is airtightly fixed, and the lower end portion of the expansion sleeve 36 is airtightly fixed to the flange portion 34b.
Two annular heat resistant packings 37 are attached to the lower surface of the.

A pressurized N ₂ gas (for example, a pressure of 5 to 8 kg / cm ² ) is supplied to the annular chamber 39 defined by the upper flange 32, the lower flange 34, and the elastic sleeve 36 from an external pressurized gas supply source, A predetermined gas pressure is maintained.

In order to limit the maximum amount of expansion of the elastic sleeve 36, a tie rod 38 is formed around the circumference of the elastic sleeve 36, for example, 20
The tie rods 38 are arranged at equal positions, and the upper end of the tie rod 38 is a flange part.
The lower end is connected to 32b and the lower end is connected to the flange portion 34b.
Each tie rod 38 includes a pair of upper and lower rods 38a and a cylinder member 3
8b, it does not extend longer than in the state shown in FIG. 2 and is extendable and contractible in the state shown in FIG.

A thick-walled annular base flange 41 is horizontally provided on the peripheral wall portion 21 of the pressure head 20 above the upper flange 32, and an inner peripheral end portion of the booth flange 41 is a steel short member fixed to the cylindrical member 31. It is fixed to the cylindrical member 42.

A pair of upright holes 43, 44, which are vertically opposed to each other, are formed in the flange portion 32b of the upper flange 32 and the flange portion 34b of the lower flange 34 at the circumference, for example, at 20 equally divided positions.
・ 44 rod member 45 is inserted vertically,
As a raising and lowering means for raising and lowering the 45, a screw shaft 47 that is inserted through the upright hole 46 of the base flange 41 just above the rod member 45, and a driving machine 48 that raises and lowers the screw shaft 47 and is fixed on the base flange 41. And a drive unit 48 that is operated.

A ball joint fitting 49 is connected to the lower end of the screw shaft 47, and a ball portion 45a at the upper end of the rod member 45 is supported by the ball joint fitting 49 so as to be rotatable relative to each other.
The flange portion 32b of the upper flange 32 is supported by 45b, and the second
In the illustrated state, the lower flange 34 is supported by the upper flange 32 via a tie rod 38.

The drive machine 48 is, for example, a worm wheel 48a externally fitted and screwed to the screw shaft 47, and an electric motor 48b (however, rotatably driving the worm wheel 48a via a worm gear.
It may be a hydraulic motor). In order to restrict the rotation of the screw shaft 47, for example, a single vertical groove is formed on the outer peripheral surface of the screw shaft 47, and a rotation restricting tool that slidably engages with the angular groove is used as a driving machine. It is provided on the case 48c of 48 or the base flange 41.

Further, engaging projections 51 are provided on the outer peripheral surface of the lower end portion of the rod member 45 projecting below the flange portion 34b of the lower flange 34 at circumferentially equally divided positions (see FIGS. 4 and 6). Further, a vertical circular hole 52 that allows passage of the lower end side portion of each rod member 45 (including the engaging projection 51) is formed in the furnace port flange 14, and the lower surface of the furnace port flange 14 is provided with Circular hole 52
Engaging member 53 is fixed concentrically with.

As shown in FIGS. 4 to 6, a guided surface 51a inclined in a predetermined direction is formed on the lower surface of the engaging projection 51, and a guide taper portion 54 for guiding is provided at the lower end of the rod member 45. Has been formed.

The engaging member 53 is formed by fixing the upper block 53A and the lower block 53B with four bolts 55 for the sake of manufacturing.
The engaging member 53 is fixed to the furnace port flange 14 with these four bolts 55, and the engaging member 53 has an engaging hole which is concentric with the circular hole 52 and which is slightly larger than the outer diameter D of the rod member 45. 56 is formed,
As shown in FIG.
A guide groove 60 for guiding the one engagement protrusion 51 is formed.

Explaining the guide groove 60, the guide groove 60 is formed in the middle of the three upright groove portions 61 that are formed at three circumferentially equidistant positions and allow the engagement protrusions 51 to pass through, and the upright groove portions 61 adjacent to each other. 3 engaging groove portions 62 and the engaging projections 51 from the lower end of each vertical groove portion 61.
A first inclined groove portion 63 that inclines downward in the same direction as the guided surface 51a (which is referred to as the forward direction) and extends to the first standby position P1 below the adjacent engaging groove portion 62 in the forward direction, and the first inclined groove portion. 63
And a second inclined groove portion 64 which is inclined in the same direction and extends from a position below each locking groove portion 62 to a second standby position P2 below an adjacent standing groove portion 61 in the forward direction. A taper surface 61a is formed on both sides of the upper half of each upright groove 61 to guide the engaging projection 51 at the time of insertion, and the engaging projection 51 is formed at the upper end of each locking groove 62.
A locking surface 62a for locking the upper end of the
The engaging projection 51 is provided on the side of the anti-forward direction side of 2 in the first standby position P1.
Guide surface 62b that guides the movement from the to the locking groove 62
And an inclined guide surface 61b for guiding the engagement protrusion 51 from moving from the second standby position P2 to the upright groove 61 is formed on the side of the lower part of each upright groove 61 on the side opposite to the forward direction. There is.

Next, the operation of the pressure head fastening device 40 and the pressure head connecting portion sealing structure will be described.

Fig. 2 shows the skirt structure with the pressure head fastening device 40 released.
30 shows a state in which the pressure head 20 is raised, and thus the pressure head 20 is supported on a trolley in a state where the pressure head 20 is separated from the furnace body 10.
After moving 20 to the side, the furnace body 10 is tilted.

Driving 20 sets of driving machines 48 from the state of FIG. 2 to lower the screw shaft 47 and the rod member 45, the skirt structure is obtained.
30 descends, and the flange portion 34b of the lower flange 34 abuts on the furnace port flange 14. Then, when the screw shaft 47 and the rod member 45 are further descended, as shown in FIG. 3, the expansion sleeve 36 and the tie rod. 38 and shrink enough, rod member
The lower end of 45 is inserted into the circular hole 52 and the engaging hole 56.

At the time of this insertion, the guide taper portion 54 at the lower end of the rod member 45
The guide member causes the rod member 45 to project into the engagement hole 56, and is guided by the tapered surface 61a of the upright groove portion 61 of the guide groove 60, and the engagement projection 51 descends down the upright groove portion 61. And the engaging protrusion
When 51 reaches the lower end of the upright groove portion 61, the guided surface 51a thereof is guided by the first inclined groove portion 63, so that the rod member 45 descends while rotating in the forward direction, and the engaging protrusion 51 moves to the first Reach standby position P1. At this time, the rod member 45 and the upper flange 32 are lowered as much as possible, and the locked portion 32c of the sleeve portion 32a of the upper flange 32 comes into contact with the upper end of the sleeve portion 34a of the lower flange 34, so that the driving machine 48 is stopped. .

Next, when the driver 48 is driven in the reverse direction, the screw shaft 47
And the rod member 45 ascend, and the engaging protrusion 51 becomes the first standby position.
Since it ascends to the locking groove portion 62 while being guided by the inclined guide surface 62b from P1 and the upper end of the engaging projection 51 is locked by the locking surface 62a,
The pressure head 20 is strongly fastened to the furnace port flange 14 via the 20 sets of screw shafts 47 and rod members 45.
The driving machine 48 is stopped when the predetermined fastening force is reached and the load on the motor 48b reaches a predetermined value.

The large levitation force acting on the pressure head 20 by the gas pressure ( ^{2 to 3} kg / cm ² ) in the pressure head 20 is 20 sets of screw shafts 47.
Also, since the rod member 45 is shared, it is not necessary to support the pressure head 20 by an external member.

Here, the lower flange 34 is pressed against the furnace port flange 14 by the elastic extension force of the expansion sleeve 36.

Moreover, the packing 37 because the pressurized N ₂ gas substantially higher pressure than the furnace gas pressure in the small diameter disposed side and the annular chamber 39 is filled than slidable sleeve 36, of the N ₂ gas Since the pressing force acting on the lower flange 34 by the gas pressure is significantly larger than the levitation force acting on the lower flange 34 by the gas pressure in the furnace, the lower flange 34 is strongly pressed by the furnace mouth flange 14 by the difference between the two. . Further, the gas pressure of the N ₂ gas generates a pressing force that urges the lower end of the expandable sleeve 36 downward, and this pressing force causes the lower flange 34 to move to the furnace port flange.
It is strongly pressed to 14.

Therefore, sufficient sealing performance is ensured through the packing 37. However, the gas pressure of the N ₂ gas is set appropriately according to the magnitude of the gas pressure in the furnace. Further, since the packing 37 is arranged on the smaller diameter side than the expandable sleeve 36, the gas pressure in the furnace may be introduced into the annular chamber 39 instead of the pressurized N ₂ gas.

In addition, the heat-shielding action of the sleeve portions 32b and 34b causes the expansion sleeve 39
Is thermally protected, and the expansion sleeve 39 is thermally protected by the heat shielding effect of the pressurized N ₂ gas in the annular chamber 39.

Next, when releasing the fastening of the pressure head 20, first
Drives 20 sets of driving machine 48, screw shaft 47 and rod member 45
When and are lowered, the guided surface 51a of the engaging protrusion 51 moves to the second position.
Since the rod member 45 is guided in the inclined groove portion 64, the rod member 45 descends while rotating in the forward direction, the engaging projection 51 reaches the second standby position P2, the driving machine 48 is stopped, and then the driving machine 48 is stopped. When the screw shaft 47 and the rod member 45 are driven upward in the opposite direction and the engaging projection 51 is guided by the inclined guide surface 61b, the rod member 45 moves upward while rotating to engage the engaging projection. The portion 51 moves up through the upright groove portion 61, and the rod member 45 is pulled out from the engaging hole 56 and the circular hole 52. Then, when the driving machine 48 is stopped when the screw shaft 47 and the rod member 45 reach the predetermined height position, the state shown in FIG. 2 is obtained.

As described above, by arranging the packing 37 on the smaller diameter side than the expandable sleeve 36, the lower part can be pressed with a sufficient pressing force generated by the gas pressure of pressurized N ₂ introduced into the annular chamber 39 or the gas pressure in the furnace. Driving the rod member 45 up and down by pressing the flange 34 against the furnace port flange 14 to ensure sealing performance and devising the engaging projection 51 and the guide groove 60 of the engaging member 53. Fastening and disengagement can be done efficiently by simple operation, and the levitation force acting on the pressure head 20 can be supported by the internal tension of the screw shaft 47 and the rod member 45, which simplifies the levitation force support structure. In addition, since the driving machine 48 is not arranged on the lower flange 34, the lower flange 34 and the furnace port flange 14 do not have large diameters, and other excellent effects can be obtained.

<First Embodiment> See FIGS. 7 and 8. This embodiment is a pressure head fastening device 40A having a simpler structure.
This is an example of the case where the above-mentioned embodiment is adopted, and the same or similar parts as those in the above-described embodiment are designated by the same or similar reference numerals, and the description thereof will be omitted. Only different configurations will be described.

The sleeve portion 32a of the flange 32A is formed short, and the sleeve portion of the lower flange 34A is omitted.

In order to move the skirt structure 30A up and down, for example, the hydraulic cylinders 40 are attached to the base flange 41 at the position of 20 equally divided circumferences.
Is fixed in an inverted shape and an insertion shape, and the lower end of the rod 50a is connected to the flange portion 32b of the upper flange 32A.

For example, the base flange 41
A rod member over the flange portion 32b and the flange portion 34b.
45A is inserted and the drive machine 48 which rotationally drives the rod member 45A
A is connected to the upper end of the rod portion 45A, the drive machine 48A is fixed to the base flange 41, a stopper 45c that locks the flange portion 32b is fixed to the middle part of the rod member 45A, and the lower end portion of the rod member 45A is fixed. A pair of engaging members 45d are provided on the outer peripheral portion of the.

The furnace port flange 14 is formed with an upright hole 52A having a groove 52a for allowing the lower end of the rod member 45A to be inserted and allowing passage of the engaging member 45b, and the engaging member 45d is located at the position of the groove 52a. A pair of restricting tools 52b for stopping are fixed to the upper surface of the furnace port flange 14.

An engaging member 53A is fixed to the lower surface of the furnace port flange 14 at the position of the vertical hole 52A, a vertical hole 56A similar to the vertical hole 52A is formed in the engaging member 53A, and the groove portion 56a of the vertical hole 56A is at the middle position. Engaging groove 56b that ends at 90 ° and extends over a range of 90 ° from that end.
Are formed.

Here, when the fastening of the pressure head 20 is released, the rod member 45A is rotated by 90 ° by the driving machine 48A to match the engaging member 45d with the groove portion 56a, and then the rod member 45A is predetermined upward. The stroke is raised, and then the skirt structure 30A is raised by the hydraulic cylinder 50.

When the pressure head 20 is fastened, the skirt structure 30A is lowered by the hydraulic cylinder 50 and the rod member 45A is lowered by the driving machine 48A in the opposite manner to the above.
Since d matches the groove portions 52a and 56a, the lower end portion of the rod member 45A fits into the upright holes 52A and 56A. However, the engagement tool 45d
When the rod member 45A is rotated when is not aligned with the groove 52b, the engaging member 45d is restricted by the restricting member 52b,
Since 45d fits into the groove portions 52a and 56a, the lower end portion of the rod member 45A is inserted into the vertical holes 52A and 56A, but when the lower limit position is reached, the rod member 45A is rotated and the engagement tool 45d engages with the engaging groove 56b. The rod member 45A engages with the engaging member 53A.

The principle of pressing the lower flange 34A against the furnace mouth flange 14 is the same as in the above embodiment, the pressing force is generated by the furnace gas pressure, and the levitation force acts on the upper flange 32A by the furnace gas pressure, This levitation force is supported by the base flange 41 via the stopper 45c and the rod member 45A.

<Second Alternative Embodiment> See FIG. 9. This embodiment is an example in which the present invention is applied to a raw material charging chute 27 that is connected to the pressure head 20 in an airtight manner and is separable. For convenience of the arrangement, the description will be given in an upright position.

The cylindrical member 70 of the charging chute 27 is supported by an external structural member, an opening 71 is formed in the peripheral wall portion 21 of the pressure head 20, and an opening flange 73 is provided on the outer peripheral portion of the opening seat 72 of the opening 71. A sleeve member 74 having a diameter smaller than that of the opening portion 71 and larger than that of the tubular member 70 is provided between the tubular member 70 and the opening portion 71 as shown in the drawing, and a movable flange externally fitted and fixed to the sleeve member 74. 75 is configured to be capable of contacting the upper surface of the opening flange 73, a supporting flange 76 is externally fitted and fixed to the tubular member 70, and a metal member having a diameter larger than that of the sleeve member 74 is provided between the supporting flange 76 and the movable flange 75. An expandable sleeve 77 is provided, and the upper and lower ends of the expandable sleeve 77 are airtightly fixed to the support flange 76 and the movable flange 75, respectively, and seal between the movable flange 75 and the opening flange 73 on the smaller diameter side than the expandable sleeve 77. A heat resistant packing 78 is provided.

Further, on the outer side of the telescopic sleeve 77, a hydraulic cylinder 79 is provided in an inverted shape at positions divided into four parts around the circumference, the cylinder body 79a is connected to the support flange 76, and the tip of the rod 79b is connected to the movable flange 75. There is.

Since the gas pressure in the furnace is introduced into the annular chamber 80, a pressing force for pressing the movable flange 75 against the opening flange 73 is generated by the gas pressure in the same manner as in the above embodiment. In addition, throwing chute
Connection and disconnection of 27 can be performed in the same manner as above via the hydraulic cylinder 79. The sleeve member 74 is a telescopic sleeve.
This is to protect 77 thermally.

<Third Alternative Embodiment> ... See FIG. 10. This embodiment is a partial modification of the second alternative embodiment.
A heat-resistant packing 81 for hermetically sealing is interposed between the upper end of the sleeve member 74 and the tubular member 70, and the annular chamber 80
A is a support flange 76, a telescopic sleeve 77, and a movable flange 75.
A hose 82 extending from an external pressurized N ₂ gas supply source is connected to the support flange 76, and the annular chamber 80A is pressurized N ₂ gas. (For example, pressure 5 to 8 kg / cm ² ) is filled.

Regarding the principle of generating a pressing force for pressing the movable flange 76 against the opening flange 73 by the gas pressure of the pressurized N ₂ gas, the heat shield effect of the sleeve member 74, and the heat shield effect of the pressurized gas in the annular chamber 80A, It is similar to the main embodiment.

<Fourth Alternative Embodiment> ... See FIGS. 11 and 12. This embodiment is a partial modification of the second alternative embodiment. Is provided with a tie rod 83, and the tie rod 83 connects the support flange 76 and the movable flange 75.

Further, a rod member 84 is connected to the lower end of the rod 79b of the hydraulic cylinder 79 by a ball joint 85, and the structure of the lower end portion of the rod member 84 and an engaging member 86 fixed to the opening flange 73.
The structure of is similar to that of the main embodiment described above, and the rod member 84 and the engaging member are provided through the three engaging projections 51A and the guide groove 60A.
It is adapted to be engaged with and disengaged from 86.

Further, in order to raise the movable flange 75 via the engaging protrusion 51A of the rod member 84, an engaging groove 90 as shown in FIG. The upper end of the engaging projection 51A can be locked by the stop surface 90a.

Engagement protrusion when the closing chute 27 is connected
51A is at the locking position P in FIG. 12, and the support flange 7 is provided by urging the rod 79b of the hydraulic cylinder 79 upward.
6 and the opening flange 73 are in a strongly tightened state.

Next, when the closing chute 27 is separated, when the rod member 84 is moved downward, the engaging protrusion 51A moves to the second standby position P.
2 and then the rod member 84 is moved upward, the engaging protrusion 51A moves upward through the upright groove portion, but moves to the locking position K of the engaging groove 90 of the movable flange 75. , Locking surface 90
Since it is locked at a, the movable flange 75 is pulled upward.

When connecting the closing chute 27 again, if the rod member 84 is extended downward, the movable flange 75 comes into contact with the opening flange 73, and then the engaging projection 51A moves from the locking position K to the guide groove 6.
When the rod member 84 is moved up to the first standby position P1 within 0A, the engaging protrusion 51A moves to the locking position P.

In this embodiment, since the cylinder member 70 and the opening flange 73 can be strongly connected via the hydraulic cylinder 79 and the rod member 84 in the state where the charging chute 27 is connected, the structure that supports the cylinder member 70 against the gas pressure. It is advantageous in terms.

<Fifth Embodiment> See FIG. 13. This embodiment is the same as the second embodiment, and the raw material feeding chute 27 is used.
The connection part seal structure is disclosed for reference.
The same or similar parts as those of the other embodiment are designated by the same or similar reference numerals and detailed description thereof will be omitted.

The distance between the lower end of the cylindrical member 70A of the charging chute 27 and the upper end of the opening seat 72 is set to be large, and the upper end of the sleeve member 74A is fitted to the cylindrical member 70A via a heat-resistant packing 81A so as to be airtight and capable of moving vertically The inner surface of the tubular member 70A is lined with a refractory material, the inner surface of the sleeve member 74A is also lined with a refractory material, and the first movable flange 75A is externally fitted and fixed to the middle portion of the sleeve member 74A. A second movable flange 75B that abuts the opening flange 73 is disposed below the movable flange 75A, and the support flange 7 is provided outside the sleeve member 74A.
A first elastic sleeve 77A made of metal is provided between 6A and the first movable flange 75A, and the upper end portion and the lower end portion thereof are provided with a support flange 7A.
6A and the first movable flange 75A are fixed to each other in an airtight manner. Further, a second elastic sleeve 77B made of metal is provided between the first movable flange 75A and the second movable flange 75B on the outer side of the sleeve member 74A, and the upper end portion and the lower end portion thereof have the first movable flange 75A and the second movable flange. They are fixed to 75B in an airtight manner.

A hydraulic cylinder 79A for connecting the support flange 76A and the first movable flange 75A is fixedly provided to the support flange 76A at six circumferential positions on the outer side of the first elastic sleeve 77A, and the rod 79b has a compression coil spring. 88 is exterior. A disc spring may be used instead of the spring 88.

Pressurized N ₂ gas (for example, pressure 5 to 8 kg / cm ² ) is filled into the annular chamber 80B from the external pressurized N ₂ gas supply source through the gas introduction hole 75a of the first movable flange 75A, and the gas is also supplied. Introductory hole 75b
Also, the pressurized N ₂ gas is introduced inside the second elastic sleeve 77B.

Further, in order to limit the maximum amount of extension of the second expansion / contraction sleeve 77B, the first movable flange 75A and the second movable flange 75B are connected by the tie rods 83A at the circumferentially equally divided positions.

The lower surface of the second movable flange 75B is provided with three annular seal grooves 78a, and the same pressurized N ₂ gas is supplied through the gas introduction holes communicating with these seal grooves 78a.
The second movable flange 75B and the opening flange 73 are sealed with N ₂ gas. The seal groove 78a
Heat-resistant packing may be attached to the innermost and outermost ones, or heat-resistant packing may be attached to all the seal grooves 78a.

In the connected state shown in the figure, the sleeve member 74A and the first movable flange 75A are urged downward by the gas pressure of the pressurized N ₂ gas in the annular chamber 80B, the elastic force of the compression coil spring 88 and the extension force of the first expansion sleeve 77A. Thus, the gas pressure in the furnace, the extension force of the second elastic sleeve 77B, and the pressure applied to the second elastic sleeve 77B by the gas pressure in the furnace are balanced. The hydraulic cylinder 79A
The rod 79b may be urged downward or released.

The second movable flange 75B is urged downward by the pressure applied to the second expansion sleeve 77B by the gas pressure in the furnace and the extension force of the second expansion sleeve 77B, and the second movable flange 75B acts on the lower surface thereof. The second expansion sleeve 77B is sized so that the downward pressing force of the second expansion sleeve 77B is considerably increased due to the in-furnace gas pressure.

Incidentally, the present invention can be similarly applied to the case where the raw material charging chute 27 is connected to the furnace body 10 as well as the case where it is connected to the pressure head 20.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a vertical sectional view of a smelting reduction furnace, and FIGS. 2 and 3 are longitudinal cross-sectional views of a skirt structure, a pressure head fastening device and a seal structure for a connection part, respectively. Floor plan,
FIG. 4 is a cross-sectional view of the rod member, FIG. 5 is a plan view of the engaging member, FIG. 6 is a development view of a guide groove including the lower end portion of the rod member, and FIG. 7 is related to the first alternative embodiment. 3 is a partial view corresponding to FIG. 3, FIG. 8 is a plan view of a main portion of the furnace port flange of FIG. 7, and FIGS.
FIG. 11 is a sectional view of the main part of the charging chute according to the second to fourth alternative embodiments, and FIG. 12 is a development view of the engagement groove and the guide groove of FIG. 11,
FIG. 13 is a sectional view of a main part of a charging chute according to a fifth alternative embodiment. 1 ... Smelting reduction furnace, 11 ... Furnace opening, 14 ... Furnace opening flange,
20 …… Pressurizing head, 27 …… Charging chute, 32 ・ 32A ……
Upper flange, 34 / 34A …… Lower flange, 36 …… Sleeve, 37 …… Packing, 38 …… Tie rod, 41 …… Base flange, 45 / 45A …… Rod member, 47 …… Screw shaft, 48 / 48A… … Drive, 50 …… hydraulic cylinder, 51.5
1A ... Engaging protrusion, 53 / 53A ... Engaging member, 70 ... Cylindrical member, 71 ... Opening part, 73 ... Opening flange, 74 ... Sleeve member, 75 ... Movable flange, 76 ... Support flange, 77
...... Telescopic sleeve, 78 ...... Packing, 79 ...... Hydraulic cylinder, 80A ...... Annular chamber, 84 ...... Rod member, 86 ...... Engagement member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshio Uchiyama 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory (72) Ken Ken Takiura Higashi-kawasaki, Chuo-ku, Kobe-shi, Hyogo 3-1-1 1-1 Kawasaki Heavy Industry Co., Ltd. Kobe factory (72) Creator Satoshi Tatsuda 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture Kawasaki Heavy Industry Co., Ltd. Kobe factory (72) Inventor Yukihiko Takaza 3-1, 1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Inside the Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor Sumio Sato 3-1-1, Higashi-kawasaki-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside the Kawasaki Heavy Industries, Ltd. Kobe factory

Claims (4)

(57) [Scope of utility model registration request] 1. A connection part seal structure for connecting a pressure head, which is hermetically and separably connected to a furnace port of a pressure type metal melting furnace, to a furnace port flange, wherein a peripheral wall part of the pressure head is hermetically sealed. An upper flange that is fitted up and down so that it can move up and down, a lower flange that abuts on the upper surface of the furnace opening flange, and an upper end and a lower end that are arranged between the upper flange and the lower flange in an airtight manner. A fixed metal expansion sleeve, a sealing means for sealing between the lower flange and the furnace opening flange on the smaller diameter side than the expansion sleeve, and an elevating means for elevating the upper and lower flanges, A sealing structure for a connection part of a pressure-type metal melting furnace, characterized in that a lower flange is pressed against a furnace port flange by a pressure force acting on a telescopic sleeve and a lower flange by gas pressure. 2. A connecting portion sealing structure for connecting a pressure head, which is hermetically and separably connected to a furnace opening of a pressure type metal melting furnace, to a furnace opening flange, wherein a peripheral wall portion of the pressure head is airtight and separate. An upper flange that is fitted up and down so that it can move up and down, a lower flange that abuts on the upper surface of the furnace opening flange, and an upper end and a lower end that are arranged between the upper flange and the lower flange in an airtight manner. A fixed metal expansion sleeve, an annular chamber defined by the upper and lower flanges and the expansion sleeve through the sleeve part of the upper flange and the sleeve part of the lower flange, and a lower part on the smaller diameter side than the expansion sleeve. A sealing means for sealing between the flange and the furnace opening flange, and an elevating means for elevating the upper and lower flanges are provided, and the gas pressure of the pressurized gas supplied from the outside to the annular chamber is used. Connecting seal structure of a pressure type metal melting furnace for under a pressure acting on slidable sleeve and the lower flange, characterized by being configured to press the lower flange to the furnace opening flange. 3. A connecting portion sealing structure for connecting a tubular member, which is hermetically and separably connected to an opening of a pressurization type metal melting furnace, to an opening flange of a furnace main body, wherein the tubular member is fitted to the tubular member in an airtight manner. A fixed support flange,
A movable flange that is in contact with the upper surface of the opening flange, a metal expansion sleeve that is disposed between the support flange and the movable flange, and has an upper end portion and a lower end portion that are airtightly fixed to these flanges, and an expansion sleeve. A sealing means for sealing between the movable flange and the opening flange on the smaller diameter side, and an elevating means for raising and lowering the movable flange are provided, and the movable gas is movable by the pressurizing force acting on the expansion sleeve and the movable flange by the gas pressure in the furnace. A structure for sealing a connection portion of a pressure type metal melting furnace, characterized in that the flange is configured to be pressed against the opening flange. 4. A connecting portion seal structure for connecting a tubular member, which is hermetically and separably connected to an opening of a pressurization type metal melting furnace, to an opening flange of a furnace main body, wherein the tubular member is externally fitted to the tubular member in an airtight manner. A fixed support flange,
A movable flange that is in contact with the upper surface of the opening flange, a metal expansion sleeve that is disposed between the support flange and the movable flange, and has an upper end portion and a lower end portion that are airtightly fixed to these flanges, and an expansion sleeve. A sleeve member internally fitted and fixed to a movable flange and having an upper end fitted to a tubular member in a hermetically slidable manner; and an annular chamber defined by the both flanges, a telescopic sleeve, the sleeve member and the tubular member. ,
A pressurizing gas supplied from the outside to the annular chamber is provided with a sealing means for sealing between the movable flange and the opening flange on a smaller diameter side than the expansion sleeve, and an elevating means for elevating the movable flange and the sleeve member. A structure for sealing a connection portion of a pressurizing type metal melting furnace, wherein the movable flange is pressed against the opening flange by a pressing force acting on the expansion sleeve and the movable flange by the pressure.