JPS6330104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a sliding closure device for molten materials, in particular molten metals, comprising at least one fixed closure plate and a sliding closure plate with a fixed position. A contacting movable closure plate is provided, the movable closure plate having two flow openings and a closure area, the closure area being provided on the fixed closure plate. Drive means are provided for shifting the movable closure plate between a closed position covering the aperture and an open position in which the through-holes on one of the movable closure plates coincide with the openings in the stationary closure plate. Regarding the format of

PRIOR ART Sliding closure devices having two (or more) through-holes in a movable closing plate generally replace one through-hole after wear with another through-hole which is not yet in use. This helps in obtaining long casting times without having to change the closure plate. In this case, the flow openings may have the same or different diameters.

1 as well as only one fixed position closure plate
A sliding closing device of this type with two movable closing plates is known from German Patent No. 2850183 (JP 54-77237). In this construction of the closure device, a carriage is mounted in the closure device housing, which is actuated by a first hydraulic cylinder drive. The carriage has a pivot frame and a second hydraulic cylinder drive coupled to the pivot frame. Finally, a movable sector-shaped closing plate is held on this pivoting frame.

Problems to be Solved by the First Invention In this known slide type closing device, the closing device is operated (opening, closing, throttling) by sliding the carriage together with the rotating frame using the first drive device. whereas the second drive is required for swiveling the pivot frame along the carriage to change from one through-hole to the other; Friction of the closure plates and other parts pressed together (as during movement) must be overcome.

Furthermore, this known closure device is extremely expensive to manufacture and difficult to operate. Furthermore, each of the two hydraulic drives requires its own conduit and its own control device. In addition to this, during operation a large amount of energy is required due to the large masses that must be moved, namely the carriage, the pivoting frame and the second drive.

It is therefore an object of the first invention to improve a sliding closing device of the type mentioned at the outset, in particular in a manner that significantly simplifies the construction of the actuating device and reduces its manufacturing costs.

Means for Solving the Problem In order to solve this problem, in the configuration of the first invention, a first through-hole extending between the closing range and one through-hole or the other through-opening of the movable closing plate, respectively. guiding means are provided for alternatively defining a first path of movement and a second path of movement of the movable closing plate along a trajectory of Only one drive means is provided coupled to the movable closure plate for shifting the movable closure plate along the selected path of movement between the open position and the first movement path. The guide means are adjustable for selectively switching between the second movement path and the second movement path without shifting the movable closure plate when it occupies the closed position.

Problem to be Solved by the Second Invention The device, as known from German Patent No. 2850183 already mentioned, comprises two through-openings and a closing region located laterally next to both through-openings. The movable closing plate has a sector-like shape, since the pivot axis for the pivot frame is located far outside the plate surface. As a result, from both flow openings, two movement trajectories extend completely side by side and completely apart from each other in the direction of the closing area, which must be correspondingly wide.

It is therefore an object of the second invention to provide a sliding closing device with a movable closing plate having a small plate surface for a given spacing and diameter of the two flow openings.

Means for Solving the Problem In order to solve this problem, in a second invention, the movable closing plate is fire-resistant, and the movable closing plate is held in a suitable position in a metal holding frame. The plate surface of the closing plate is mainly limited by three straight sections located on three sides of a regular triangle, and the centers of both through-holes are located on the bisectors of the two interior angles of the regular triangle. It is located in

Embodiment The sliding closure device shown in FIGS. 1 and 2 is a three-plate closure device, and as is well known, this closure device is installed at the bottom of a melting furnace, which is an intermediate furnace of continuous caster equipment, for example. installed. The drawing shows the metal outer wall 1 and the refractory lining 2 of the furnace.
only is shown. A refractory perforated brick 3 is installed in the opening in the outer peripheral wall 1, the perforated brick 3 having a controllable hole 4 extending downwardly through a closing device adjoining the perforated brick 3. It forms the starting end of the flow passage.

The sliding closure device is generally designated 10 (see FIG. 1). Sliding closure device 10
The upper part 11 of the casing is fastened to the melting furnace in a known manner, not shown. In order to control the flow through of the molten metal, the closed position consists of three refractory closing plates: a fixed upper plate 6 held in the upper part 11 of the casing and provided with an opening 5, a movable intermediate plate 7 and an opening 5. 5 and a fixed lower plate 8 with an aperture aligned with 5. The lower plate 8 is a component of a removably secured closure device lower part 12, the configuration of which is not important to an understanding of the invention, so the lower part 12 is simply referred to as one. Indicated by a dotted line. three closing plates 6 by means of the lower part 12 or in another manner not shown;
7, 8 are pressed together, so that the intermediate plate 7 is constantly in sliding contact with the two fixed plates 6, 8.

A movable closing plate 7, commonly referred to as a "slide plate", is gripped by a metal holding frame 14 and together with this forms a closing slide. A direct drive is fastened to this closing slide via a hinge pin 22, which in the illustrated embodiment is located at point 2.
It consists of a hydraulic cylinder 24, which is a lifting cylinder, and a piston rod 23, which is attached to a hydraulic cylinder 5 (see FIG. 3). The intermediate plate 7 has two flow openings 30, 31 which are manufactured as round holes in a customary manner. A hatched closed area 32 is located laterally next to the two flow openings 30, 31.
In the illustrated closed position of the closing slide, the closing area 32
is located between the opening in the upper plate 6 and the opening in the lower plate 8, which are fixed in position. By operating the hydraulic cylinder 24 and using a special link mechanism described below, either one of the through-flow ports 30, 31 is selectively aligned with the openings provided in the upper plate 6 and lower plate 8, which are fixed in position. Being forced to
The molten metal is allowed to flow out. In this case, it is of course also possible to narrow the flow cross section by obtaining intermediate positions by means of suitable drive control.

With a suitable selection of the structure and support type of the closing slide, the closing device can also be constructed as a two-plate sliding closing device in a known manner without a fixed lower plate. A refractory tapping sleeve (not shown) is usually connected to the flow opening or opening in the lowest plate in each case.

On both sides at the height of the closing slider as a passive linkage for moving the intermediate plate 7, the upper part 11 of the casing is connected via a pin 16.
A two-armed guide arm 1 rotatably supported on the
5 are placed one by one. Both guide arms 1
5 forms a stationary track guide means for the intermediate plate 7, that is to say stationary during the closing slide movement. The two guide arms 15 are connected to each other at one end via a hinge pin 18 and a rod 17, by means of which they are kept constantly parallel to each other. Both guide arms 15 together with the rod 17 are moved from the illustrated position 15a to 1
A switchover to the second position 15b, shown in dotted lines, can be made, for example, by means of a bayonet pin 20 on the rod 17. The insertion pin 20 is inserted into a suitable locking hole 2 provided in the upper part 11 of the casing.
1a or 21b. This changeover takes place in each case when the closing device is closed, ie when the intermediate plate 7 is in the illustrated closed position, the closing slide not being moved. Switching of the guide arm 15 can therefore be carried out easily by hand, for example by means of a lever 19 which is fixed on the rod 17 and extends out from the closure housing. If necessary, the insertion pin 20 can be pulled out of one locking hole and inserted again into the other locking hole via this lever 19.
However, it is of course also possible to unlock the guide arm 15 in both end positions in other ways.

In order to cooperate with the guide arm 15, the holding plate 14 has two pairs of mutually parallel guide surfaces 26, 2.
8; 27, 29. Position 15a as shown
There, the closing slide is guided between the guide arms 15 by guide surfaces 27, 29 and in the other position 15b by guide surfaces 26, 28. Depending on which position 15a or 15b is occupied, the intermediate plate 7 is moved by the hydraulic cylinder 24 from the closed area 32 of the intermediate plate 7 to the two through openings 30, 31.
It is shifted in one direction of two linear trajectories x and y shown by dashed-dotted lines extending toward . Holding frame 1 for both trajectories x and y
The guide surfaces 27, 29; 26, 28 of No. 4 are also parallel to each other.

Both end positions 15a, 15b of guide arm 15
and the corresponding movement of the closure slider are shown in FIGS. 3 and 4. In the locking position shown in FIG. 3, the guide arm 15a guides the closing slide in the direction of the trajectory x, i.e. the intermediate plate 7
together with the retaining frame 14 in the closed position shown and 1
It is shifted between an open position 14a shown in dotted lines, in which the flow opening 30 coincides with the fixed opening 5. Conversely, guide arm 15
If b occupies the locking position shown in FIG. 4, the closing slider is shifted in the direction of the trajectory y between the closed position 14b, which is the same as the closed position in FIG. 3, and the open position 14b; In 14b, intermediate plate 7
The other through-flow opening 31 coincides with the fixed opening 5 . During the switching of the guide arm 15 between the two end positions, the intermediate plate 7 of the closing slide in the closed position does not move, so that switching of the passive linkage takes place almost without any force. . Furthermore, the movement of the closing slide in the direction of the trajectory x and y is a purely linear movement, i.e. the closing slide is not pivoted, but merely undergoes a constant deflection of the hydraulic cylinder 24 about its mounting 25. be.

It is particularly advantageous if the guide device is constructed such that the two trajectories x and y form an angle α of 60°. Also, (if the stroke length of the movement of the closing slider is predetermined)
Advantageously, both trajectories x, y passing through the center of , intersect at one point 33 of the closure area 32 . In this case, this point 33 defines the only closed position common to both flow openings 30, 31.

5 and 6 show a variant embodiment for the stationary track guide means, in which the holding frame 44 for the intermediate plate 7 is somewhat different from said holding frame 14. It has a shape. However, this closing device otherwise corresponds in construction to the embodiment described above, and corresponding parts are designated by the same reference numerals.

Two pairs of stationary guide slots 46, 47, which are preferably formed in the upper housing part 11, are provided in this embodiment as fixed path guide means for defining the linear movement trajectory x, y of the slider. . Two oppositely located retaining frames 44
A pin 43 is inserted into each of the two extensions, and each pin 43 engages in one of the two pairs of slits. As shown, slit 46 extends parallel to trajectory x and slit 47 extends parallel to trajectory y. In order to define in which direction the closing slide can be moved from the illustrated closed position, each pair of slots is provided with a switching element, in the illustrated embodiment a pivotably mounted sleeve 48. This sleeve 48 is open with slots 46, 47 and is provided with a radial slot 50, which can therefore be moved by pivoting the sleeve 48 into one guide slot 46 or the other guide slot 47. can be matched to In order to orient the radial slits 50 of both sleeves 48 in the same direction, both sleeves 48 are pivotably attached to a rod, which in the illustrated embodiment is formed by a lever 51 extending from the sleeve 48. They are connected to each other via a single horizontal bar 52. The lever 51 is fixed to the sleeve 48 via a diametrically extending slit provided in the collar 49 of the sleeve 48. The manually operated rods 51, 52 can also be locked in this embodiment in two end positions, for example by means of a bayonet pin 40 inserted into one of the two positioning holes 41a, 41b. Switching takes place in the intermediate plate closed position shown, in which the pin 43 is centered in the sleeve 48 within the radial slit 50.

Depending on which end position the two sleeves 48 are locked, upon actuation of only one direct drive the slider is shifted in the direction of the trajectory x or y, in which case the pin 43 is radially From the directional slit 50 there is a transition to a guide slit 46 or 47. In FIG. 5, an open position 44a associated with the trajectory x and the through-hole 30 and an open position 44b associated with the orbit y and the through-flow opening 31 are indicated by dot-dashed lines. The movement of the intermediate plate 7 or the entire closing slide as well as its end position is exactly the same as shown in FIGS. 3 and 4. In this embodiment as well, therefore, the switching of the stationary guide means takes place in the closed position of the intermediate plate 7, in which case the closing slide does not move.

As can be seen in FIG. 5, both pins 43 are located approximately on a straight line connecting the centers of the two through-holes 30, 31, so that the pair of guide slits 46, 47 in the closing device casing and the switching member 48, 50 positions have also been determined. However, in contrast to this, the fixed guide means in the closure device casing and the pin 4 in the holding frame 44
3 may be placed at another position. Thus, the pin 43 can, for example, be located on the axis of symmetry of the slider extending through the hinge pin 22. Further, the switching members 48 and 50 for guiding the pin 43 to one of the guide slits can also be arranged at a different position from that shown.

The further embodiments of the sliding closure shown in FIGS. 8 and 9 differ primarily in the configuration of the switchable passive linkage. In this embodiment, the link mechanism thus guides the movable closing plate (intermediate plate 7) along two arcuate tracks. The rest of the structure of the three-plate closure device likewise corresponds to that shown in FIGS. 1 and 2, corresponding parts being designated by the same reference numerals.

The movable closing plate or intermediate plate 7 is gripped by a metal holding frame 74, which together forms a closing slide.
A single direct drive, for example a hydraulic cylinder-piston unit, is fixed to the holding frame 74 via a hinge pin 22, of which only the piston rod 23 is shown in the drawing. A closed region 32 of the intermediate plate 7, indicated by diagonal lines, is located laterally next to the flow openings 30, 31 of the intermediate plate 7;
2 is located in the illustrated closed position of the closing slide between the opening 5 of the fixed upper plate 6 and the opening of the likewise fixed lower plate 8.

In this embodiment, the passive linkage for shifting the movable closing plate (intermediate plate 7) is constructed in such a way that the two movement trajectories x, y, respectively assigned to the flow openings 30 and 31, extend in the form of a circular arc. ing. In the holding frame 74, holes 75a and 75b are provided at the center of each arcuate trajectory x and y. The fixed part of the sliding closure device 10 is preferably provided in the upper part 11 of the casing, as shown, with corresponding holes 7 which align with the holes 75a, 75b, respectively, in the closed position of the closure slides 7, 74.
7a and 77b are provided.

This allows the pivot pin 76 to move between both hole pairs 75a, 7
7a; can be selectively inserted into either one of 75b and 77b. Depending on which pair of holes the swivel pin 76 is inserted, the closing slide performs one or the other defined swivel movement when the direct drive is activated. For example, if the pivot pin 76 passes through the holes 75a and 77a as shown, the through opening 30 of the intermediate plate 7 moves along the trajectory Frame 74 occupies a position 74a shown in dashed lines. In the other case i.e. pivot pin 7
6 is inserted into the holes 75b and 77b, the through-flow port 31 reaches the open position along the trajectory y and matches the opening 5 whose position is fixed. The two movement trajectories x and y therefore intersect at a point 33 on the axis of the fixed aperture 5. Opening 5 and flow opening 30 in open position
In order to ensure that the swivel movements of the one and the other of the closing slides are limited by suitable, optionally adjustable, stops for the holding frame (not shown). It's okay.

The pivot point (hinge pin 22) of the linear drive on the holding frame 74 is preferably located on the axis of symmetry between the holes 75a and 75b, as can be seen in FIG. However, other pivot points can also be selected, as long as the direction of the driving force does not extend through either of the holes 75a, 75b.

As already mentioned, switching of the passive linkages 75, 76, 77 to one of the movement trajectories x, y occurs when the closing device is closed, that is, when both hole pairs 75
This is performed when a, 77a; 75b, 77b match each other. In this case, the pivot pin 76 can be easily inserted. This operation is also possible from outside the closure device casing using a suitable operating lever or the like. Of course, suitable locking elements (not shown) may also be provided for the pivot pins.

FIG. 7 shows an embodiment of a fire-resistant movable closing plate (intermediate plate 7) according to the second invention. In the illustrated embodiment both through-holes 3
0 and 31 have different diameters. However, the (linear or arcuate) motion trajectory x, y passing through the center of both through-flow ports 30, 31, and the closing point (intersection point 33) common to both through-flow ports 30, 31.
The position is as described above. The intermediate plate 7 shown in FIG. 7 in the closing area, here in the area of the intersection point 33, has a device 63 for introducing gas into the through-flow channel when the closing device is closed.
Reference numeral 64 indicates a suitable gas line connection on the holding frame 14. In this case, the gas passages pass through the interior of the holding frames 14, 44 and the intermediate plate 7 to reach the device 63, as shown. Such devices for introducing gas are known per se in connection with other types of sliding closure devices or movable closure plates.

Primarily, the intermediate plate 7 has a certain geometry with respect to the plate surface and its outer periphery, and the intermediate plate 7 is gripped in a suitable position at its outer periphery by a metal holding frame 14. Of course, the holding frame may also be a holding frame 44 or other metal holding frame). As can be seen from the drawing, the main limitations of the plate surface are three straight sections 56, 57,
58, and these straight line segments are located on three sides e, f, and g of a regular triangle. Furthermore, both the flow holes 30 and 31 are arranged on the plate surface such that the centers of both flow holes are located on the internal angle bisectors r and s of the regular triangle, respectively. The corners of the intermediate plate 7 can also be chamfered, but preferably the three straight sections 56, 57, 58 are formed by three arcs 60, 61, 6.
2, in this case 2 of them
The two circular arcs 60 and 62 represent the through-flow ports 30 and 31, respectively.
are concentric with and formed by mutually equal radii. The third circular arc 61 likewise has an equal radius, but this radius may be chosen larger or smaller than the other two circular arcs 60, 62. By virtue of this (in conjunction with the appropriate shape of the holding frame),
It is ensured that the intermediate plate 7 is fixed in only one position in the holding frame. The tightening of the intermediate plate 7 on the holding frame 14 is achieved in the illustrated embodiment by means of pressure screws 59;
In this case, the pressure screw 59 is located on the leg of the holding frame 14 and presses against the straight section 56. The straight sections 57 and 58 are thereby pressed towards the remaining two legs of the holding frame.
However, it is of course also possible for the fire-resistant movable closing plate 7 to be held in a detachable manner in a different manner on the metal holding frame 14.

In the geometry described above the intermediate plate 7, the direction of motion, i.e. the trajectory x, y, respectively corresponds to the straight line section 5
7 and 58, and intersects on the third interior angle bisector t of the regular triangle (intersection point 3
3). Due to this shape of the movable closing plate, the refractory material exposed to wear can be reduced due to the defined length of movement of the closing slide and the diameter of the through-hole. can be used optimally. In other words, the intersection 33 and the centers of the flow holes 30, 31 similarly form a regular triangle surrounded by plate surface edges having the same width almost everywhere.

Effects of the First Invention As can be seen from the above description, in the sliding closure device according to the first invention, the link mechanism can be switched without moving the movable closure plate or changing the position of the closure plate. The switching from one flow opening to the other flow opening provided in known sliding closing devices is advantageous since it takes place in the closed position of the plate and this switching action can therefore be carried out easily by hand. The second drive device that would otherwise be required can be omitted. Furthermore, since a carriage and a swivel frame overlying the carriage are no longer required, the structural height and movable mass of the closing device are reduced.

Effects of the second invention When configured as in the second invention, the refractory movable closing plate has a single point common to both flow openings.
Only two closure areas, ie closure areas located at one corner of the regular triangle, are required, so that the plate material which is subject to wear can be utilized particularly well.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the three-plate sliding closure device installed in the melting furnace along the line - in FIG. 2, and FIG. 2 shows the switchable link mechanism and retaining frame according to the first embodiment. FIG. 1 is a sectional view taken along the line --, showing a movable intermediate plate provided with the movable intermediate plate; FIGS. 3 and 4 are views showing the mode of operation of the first embodiment shown in FIG. 2; FIG. shows a second embodiment of the passive linkage and retaining frame,
A view corresponding to FIG. 2, FIG. 6 is a sectional view taken along the line - in FIG. 5, and FIG. 7 shows an embodiment of the movable closing plate used in the sliding closure device according to the second invention. FIG. 8 shows still another embodiment of the sliding closure device according to the first invention, and is a sectional view taken along the line - in FIG.
FIG. 9 is a sectional view taken along the line --- in FIG. 8. 1... Outer wall, 2... Lining, 3... Brick with holes, 4... Holes, 5... Openings, 6... Upper plate (fixed position closing plate), 7... Middle plate (movable closing plate) plate), 8... lower plate (fixed position closing plate), 10... sliding closure device, 11... casing upper part,
12... lower part of the closure device, 14... holding frame, 15... guide arm, 16... pin, 17
... Rod, 18 ... Hinge pin, 19 ... Lever, 20 ... Insertion pin, 21a, 21b ... Locking hole, 22 ... Hinge pin, 23 ... Piston rod, 24 ... Hydraulic cylinder, 25 ... Installation Department,
26, 27, 28, 29...Guide surface, 30, 3
1... Through-flow port, 32... Closing range, 33... Intersection, 40... Insertion pin, 41a, 41b... Positioning hole, 43... Pin, 44... Holding frame, 46, 47... Guide slit, 48 ...Sleeve (switching member), 49...Brim, 50...
Radial slit, 51... Lever, 52... Horizontal bar, 56, 57, 58... Straight line section, 59... Pressing screw, 60, 61, 62... Circular arc, 63...
Apparatus, 64... Gas conduit connection part, 74... Holding frame, 75a, 75b... Hole, 76... Swivel pin, 77a, 77b... Hole, α... Angle, e,
f, g...Sides of regular triangle, r, s, t...Interior angle 2
Equisector line, x, y... Orbit.

Claims (1)

Claims: 1. Sliding closure device 10 for melting materials, comprising at least one fixed closure plate 6, 8 and a movable closure plate in sliding contact with the fixed closure plate. 7, and the movable closing plate connects the two through-holes 3.
0,31 and one closed range 32,
The closed range covers the opening 5 provided in the fixed closing plates 6, 8, and the opening of the fixed closing plates 6, 8 in which the through-holes 30, 31 of either one of the movable closing plates 7 are fixed. 5, in which drive means are provided for shifting the movable closure plate 7 between the open position coincident with the closure area 32 of the movable closure plate 7 and the one through-hole 30 or the other. Alternatively, the first movement path and the second movement path of the movable closing plate 7 are arranged along the first trajectory x and the second trajectory y respectively extending between the through-flow opening 31 of the guiding means defined in the figure are provided and are coupled to the movable closure plate 7 for shifting the movable closure plate 7 along the selected path of movement between a closed position and a selected open position; Only one drive means is provided, said guide means for selectively switching between the first and second movement path, when the movable closing plate 7 occupies the closed position. A sliding closure device for melting materials, characterized in that it is adjustable without shifting the movable closure plate. 2. The first trajectory x and the second trajectory y extend in a straight line, and the guiding means has a control mechanism for controlling the movement of the movable closure plate 7 along either of the two trajectories. , a sliding closure device according to claim 1. 3. A sliding closure device according to claim 2, wherein the two trajectories x, y intersect at an angle α of 60°. 4. A holding frame 14 is provided which holds the movable plate 7 and is movable together with the movable plate, the guide means having two pairs of linear guide surfaces 2;
7, 29; 26, 28 on the holding frame 14, both pairs of guide surfaces extend parallel to the first trajectory x and the second trajectory y, respectively, and the control mechanism 3. Sliding closure device according to claim 2, comprising two guide arms 15 which can be locked in one of two pivoting positions for supporting a pair of faces. 5 a link member which is pivotally connected to the guide arms 15 and movable together with both guide arms between the two pivoting positions in order to maintain the guide arms 15 in parallel positions; 5. The sliding closure device according to claim 4, further comprising locking means for locking both guide arms and the link member. 6. A holding frame 44 is provided which holds the movable plate 7 and is movable therewith, the guide means being arranged in two fixed pairs of linear guide slots 4 relative to the fixed closing plate.
6, 47, both pairs of guide slits extend parallel to the first trajectory x and the second trajectory y, respectively, and the control mechanism slides into either one of the pairs of guide slits. 2. A slide according to claim 2, comprising a pin 43 extending in such a manner and fixed to the holding frame 44, and a switching element for directing the sliding of said pin into a selected pair of guide slits. type closure device. 7. The switching element is configured as a sleeve 48 with a radial slot 50, which is arranged between a first position, in which the radial slot 50 is aligned with one of the pairs of guide slots, and a second position. 7. A sliding closure device according to claim 6, wherein the sliding closure device is adapted to be rotatable between the sliding closure devices. 8 Lever 51 is fixed to each sleeve 48 which acts as a switching member, and is pivotally connected to both levers 51 in order to keep the levers in mutually parallel positions, and together with both levers 51 and sleeve 48, the levers 51 are fixed in the two positions. The sliding type according to claim 7, wherein a movable link member is provided on either side, and a locking means for locking the link member and thus the lever 51 and the sleeve 48 at either position. Closing device. 9. The first trajectory x and the second trajectory y are curved along an arc of rotation, and the guide means controls the movement of the movable closing plate 7 along either of the two curved trajectories. A sliding closure device according to claim 1, comprising a mechanism. 10. A holding frame 14 is provided that holds the movable plate 7 and is movable together with the movable plate, and the control mechanism includes two holes 77a and 77b provided at the rotation center of each orbit x and y, It consists of a pivot pin 76 that is inserted into one of the two holes to pivot the holding frame 14, so that the movable plate 7 pivots around one of the centers of rotation each time. A sliding closure device according to claim 9, which is possible. 11 The sliding closure device includes two stationary closure plates 6 spaced apart from each other;
The sliding closure device according to claim 1, which is a three-plate closure device consisting of a movable closure plate 7 and a movable closure plate 7 arranged between the two closure plates. 12. Both trajectories x, y extend through the centers of the through holes 30, 31 of the movable closing plate 7, respectively, and intersect at the intersection 33 in the closing area 32, so that the movable closing plate 7 is in the closed position. If the movable closure plate 7 is moved from one of its open positions to the closed position, the intersection 33 is aligned with the center of the aperture 5 of the fixed closure plate when occupied.
2. A sliding closure device according to claim 1, wherein the closure plate is adapted to be aligned with the center of the aperture 5 of the fixed closure plate. 13 Sliding closure device 10 for melting materials
at least one fixed closing plate 6, 8 and a movable closing plate 7 in sliding contact with the fixed closing plate, the movable closing plate having two through-flows. Mouth 3
0,31 and one closed range 32,
The closed range covers the opening 5 provided in the fixed closing plates 6, 8, and the opening of the fixed closing plates 6, 8 in which the through-holes 30, 31 of either one of the movable closing plates 7 are fixed. 5 and a corresponding open position, in which drive means are provided for shifting the movable closure plate 7, the movable closure plate 7 being fireproof and having a metallic retaining frame 14. ,44
In order to hold the movable closing plate 7 in an appropriate position, the plate surface of the closing plate 7 is mainly formed into three straight sections 56, 57, 58 located on the three sides e, f, g of a regular triangle. For molten material, the centers of the two through-flow openings 30 and 31 are located on the bisectors r and s of the two interior angles of the regular triangle. Sliding closure device. 14 The three straight line sections 56, 57, 58 are 3
two circular arcs 60, 61, 62, two of which are concentric with the through-holes 30, 31 and have equal radii; A sliding closure device according to claim 13. 15 The radius of the third arc 61 is the same as that of the other two arcs 6
15. Sliding closure device according to claim 14, having a radius different from 0.62. 16. In the closed region of the movable closing plate 7 a device 63 for introducing gas is provided, which device is located on the third internal angle bisector t;
A sliding closure device according to any one of claims 13 to 15.