JP3066710B2 - Surface pressure load device for slide gate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for a continuous casting apparatus.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface pressure load device for a slide gate to be mounted on a bottom surface of a molten steel container such as a ladle or a tundish when pouring molten steel into a metal.

[0002]

2. Description of the Related Art Conventionally, it is generally known to use a slide gate at a tap hole of a molten metal container to control an outflow amount. The slide gate is mainly composed of a pair of refractory plates constituting the gate and a mechanical device for holding and driving the refractory plate, and drives one of the plates to increase the gate opening. It is a device that adjusts and controls the tapping speed.
Refractory plates are used to control the flow rate by overcoming the static pressure of the molten metal and blocking or squeezing outflow of the metal.
If the surface pressure is not applied with a constant force, the molten metal may flow out from between the plates, leading to a serious accident.

For this reason, in a general melting vessel slide gate, the surface pressure between the plates is several kgf / cm ² per unit area of the refractory plate. The force on the whole thing usually ranges from 2.3 ton to 10 ton f. On the other hand, the refractory of the slide gate is exposed to the high temperature molten metal and is severely worn, so it is replaced every few hours. In each replacement, it is necessary to release the surface pressure, open the slide gate hardware, replace the refractory, and apply the surface pressure again. Also, if the surface pressure is set too low, steel will leak from between the plates, and if it is too high, the sliding resistance of the slide gate will be so large that it will not be able to operate, leading to serious accidents such as the inability to remove molten steel from the container. Adjusting the pressure load is a very important task.

For this reason, various mechanisms have been invented for the slide gate surface pressure load device so as to prevent operation errors and individual differences. A typical example of these mechanisms is a mechanism that uses a coil spring as an elastic material and is fastened by a link mechanism (Japanese Utility Model Publication No. 59-17437). A spring which bends a predetermined amount with a bolt (Japanese Patent Laid-Open No. 54-134232) or a device which applies a surface pressure with an attached actuator (Japanese Patent Laid-Open Nos. 5-115965 and 5-169213)
Etc. have already been proposed.

[0005]

The above-mentioned prior art, although having a certain effect, has not always been satisfactory. That is, in the apparatus described in Japanese Utility Model Publication No. 59-17497 in which a coil spring is compressed by a link mechanism, the surface pressure load operation can be performed only by rotating the lever, so that the operation can be completed in an extremely short time. In the case of large slide gates where the force on refractory material ranges from several tons to 10 tons, the rotating torque of the lever is several tens kgf.
With a lever as short as m, it was difficult for one worker to operate. On the other hand, if the length of the lever is increased to enable operation by one operator, a large work space is required for the lever operation, and there is a disadvantage that a space problem occurs. . Also, when the load is released, the energy stored in the spring is released at a stroke, causing a large shock and dangerous work,
Problems such as discomfort to workers were inevitable.

On the other hand, for example, Japanese Patent Application Laid-Open No. 54-132432
In the method of giving a predetermined amount of deflection to the coil spring with bolts as described in the above item, the power tool can shorten the work time, reduce the work space, and reduce the work load. It is necessary to prepare a tool and a power source therefor, and the noise of the tool is not negligible when viewed from the working environment. Of course, even if there is no power, a surface pressure load operation can be performed with a spanner, but the operation requires a long time. Further, Japanese Patent Application Laid-Open
As described in JP-A-11965 or JP-A-5-169213, when the surface pressure is applied by an attached actuator, the operation itself can be performed simply and quickly by only operating the switching valve for the actuator. Although automatic operation is possible, there are drawbacks such as installation of an actuator, a power device for the actuator, a switching valve, and the like, which make the device expensive.

[0007]

According to the present invention, a housing fixed to the bottom surface of a molten steel container and a cover provided on the lower surface of the housing so as to be openable and closable are provided. Load and hold the refractory plate,
In a slide gate in which one of them is slid to control the opening degree of a nozzle gate, a fin-shaped protrusion is provided in a direction orthogonal to a sliding direction of a slide plate of a housing, and an upper surface of the protrusion is provided. A spring case having a spring inside is provided, and links extending below the fin-shaped protrusions are provided at both ends of the spring case, rollers are attached to the lower portions of the links, and further, when the cover is closed. , A movable surface pressure bar guided by the cover at a position facing the spring case with the fin-shaped protrusion
The rotatable surface pressure link and slide provided on the surface pressure bar side
Selectively connecting the surface pressure bar to the slide block by a projection portion provided on de block, using a cylinder for sliding plate sliding, and the housing by engaging with the roller by moving the surface pressure bar By connecting the cover with the cover and applying the surface pressure by the spring to the slide plate, a new actuator is added to the operation of releasing the surface pressure load when replacing the refractory which is a consumable part of the slide gate. Thus, it is possible to obtain a slide gate surface pressure load device that can be easily and smoothly performed without involving a physical load on an operator.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of embodiments. FIG. 1 is a longitudinal sectional view of a two-layer slide gate according to the present invention, and FIG.
3 is a plan view taken along line BB of FIG. 1, FIG. 4 is a side view taken along line CC of FIG. 3, FIG. 5 is a side view of a surface pressure load bar, and FIG. FIG. 7 is an explanatory view of a method of releasing the surface pressure of the slide gate according to the present invention, and FIG. 7 is an explanatory view of a method of loading the surface pressure of the slide gate according to the present invention.

Referring to FIGS. 1 to 5, a slide gate device 1 has a housing 5 attached to a bottom portion of a molten steel container 2 by bolts 3 and fixing fittings 4, and the housing 5 has an upper press. A slide 8 at one end via a slide block 9.
Is mounted. That is, the slider 8 and the cylinder 9 fit the T-shaped head 12 mounted on the end of the piston rod 11 of the cylinder 10 and the T groove 13 provided on the slide block 9 fitted on the head 12 mutually. The slide block 9 and the cylinder 10 are joined together, and the hammer-shaped head 14 provided on the slider side of the slide block 9 and the T-shaped groove 15 provided on the slider 8 are fitted to each other. By connecting the slide block 9, the slider 8 and the cylinder 10 are connected via the slide block 9. The slide block 9 is guided by a groove formed by the housing 5 and the guide plate 16, and reciprocates according to the movement of the cylinder. The slider 8 has a recess 18 for mounting and housing a slide plate 17 on the upper surface, and a lower nozzle holder 20 for mounting a lower nozzle 19 on a lower portion.

A cover 21 is connected to the housing 5 by a hinge pin 22 so as to be openable and closable.
The cover 21 and the slider 8 can be opened and closed integrally in a door shape around the center 2. A sliding surface is formed on the upper surface of the cover-21, and the sliding surface is formed on the sliding surface.
Are slidably mounted. A slider guide 23 is provided on the upper surface of the cover 21 so as to protrude toward the slider 8.
4 is an upper nozzle.

Next, the surface pressure load device will be described. A device for applying a surface pressure is provided on the side surface of the housing 5. That is, a fin-shaped protrusion 5a is provided on the side surface of the housing 5, and a spring case 26 incorporating a compression coil spring 25 is attached to the molten steel container 2 side of the protrusion 5a by a bolt 27. The spring case 26 has links 29a and 29b having rollers 28a and 28b.
Are attached to both ends. Rollers 30a and 30b are provided on both sides of the cover 5, and a pair of hook-shaped surface pressure bars 31 which are guided by the rollers 30a and 30b and move in a side view are provided. .

The pair of surface pressure bars 31 are connected to the cylinder 1
The ends on the 0 side are connected by a connection fitting 32, and are formed in a U-shape in plan view. One end of a U-shaped surface pressure link 33 extending toward the cylinder 10 is pivotally connected to a center portion of the connection fitting 32 via a hinge pin 34. Are provided with projections 35a and 35b on the outer side.

On the other hand, on the lower surface of the slide block 9, one projection 36, 37a, 37b is provided at the center and two left and right at intervals in the direction of expansion and contraction of the cylinder 10. The surface pressure link 33 and the surface pressure link 33
The protrusions 35a, 35b provided on the slide block 9 and the protrusions 36, 37a, 37b provided on the slide block 9 adjust the position of the slide block 9 by the cylinder 10 and rotate the surface pressure link 33 as described later. , And the expansion and contraction of the cylinder 10 is transmitted to the surface pressure bar 31 via the surface pressure link 33 to load and release the surface pressure. 38 is a stopper for stopping the surface pressure bar 31 and 39 is a stopper for positioning the slider 8.

Next, a method of releasing the surface pressure and applying a load according to the present embodiment will be described. The state shown in FIGS. 1 to 4 is a state in which surface pressure is applied, that is, a normal working state, in which the surface pressure bar 31 is pushed toward the spring case 26 and the surface pressure link 33 is rotated downward. The surface pressure bar 31 is kept stationary irrespective of the expansion and contraction of the cylinder, that is, the movement of the slide block 9. When releasing the surface pressure from this state. As shown in FIG. 6, the cylinder 10 is operated to move the piston rod 11 to the retreat limit, that is, the slide blade 17.
6, the surface pressure link 33 is rotated from the inclined state of FIG. 1 to a position substantially parallel to the bottom of the molten steel container as shown in FIG. Next, when the piston rod 11 is retracted by operating the cylinder, the protrusion 36 provided on the slide block 9 is caught by the lateral member of the surface pressure link 33. The hook-shaped surface pressure bar 31 moves in the direction of the cylinder 10 (pulls out), and the coil spring 25 is uncompressed to release the refractory plate (the upper plate and the slide plate). The surface pressure is released, and at the same time, the tip of the surface pressure bar 31 is
The engagement with 8a and 28b is also released. Therefore, the surface pressure bar
The cover 21 substantially fixed to the housing 5 via the link 31 and the links 29a and 29b is separated from the housing 5, so that the cover 21 and the slider 8 can be opened and closed like a door.

At this time, in the ordinary refractory replacement work, the molten steel container is turned over by 90 ° and the bottom surface of the molten steel container is made vertical. However, the movement is restricted by the slider positioning stopper 39 set at a position slightly retracted from the stroke retreat limit of the cylinder 10, and stops at a predetermined position. Further, the surface pressure bar 31 is stopped by being restricted by the surface pressure bar stopper stopper 38 provided on the cover 21 and does not fall off. Therefore, the method of replacing the refractory after opening the cover 21 is not different from the conventional slide gate.

Next, a case where a surface pressure is applied will be described. The cover 21 of the slide plate 17 for which the refractory has been replaced is closed in a door shape, and then the surface pressure link 33 is rotated to a position substantially parallel to the bottom of the molten steel container 2, and the cylinder 10 is actuated. As shown in FIG. 7, when the slide plate 17 is moved in the closing direction, the projections 37a and 37b provided on the slide block 9 press the projections 35a and 35b provided on both outer sides of the surface pressure link 33, and the connecting fitting 32 is moved. The surface pressure bar 31 is advanced leftward in the drawing, and the spring case 26 is attracted by the inclined surfaces 31a and 31b of the surface pressure bar 31 via the rollers 28a and 28b and the links 29a and 29b. Then, the coil spring 25 is compressed, and a surface pressure is applied between the upper plate 6 and the slide plate 17. After the surface pressure is applied, the surface pressure link 33 is rotated to the state shown in FIG. 1 so that the protrusions 37a and 37b of the slide block 9 do not contact the protrusions 35a and 35b of the surface pressure link 33. The compression state of the spring 25 is kept constant, and a stable surface pressure can be applied.

In the above-described embodiment, an example has been described in which the cylinder 10 is located below the entire apparatus when the refractory is replaced. However, when the cylinder 10 is located above the apparatus, the surface pressure bar is replaced. When the cover 21 is opened, the cover 31 is fixed so as not to drop (move) in the direction opposite to the cylinder 10. That is, if the positioning stopper of the slider 10 is provided at a position (not shown) opposite to that of the above-described embodiment, it goes without saying that the loading and release of the surface pressure can be performed by the same operation.

[0018]

As described above, according to the surface pressure load device of the present invention, the thrust of the slide plate sliding cylinder is used to move the cylinder in the projecting direction of the piston rod to the surface pressure bar. The spring is compressed using the provided slope to apply the surface pressure, and the bar is pushed and held until the roller reaches the horizontal surface of the surface pressure bar. On the other hand, when the surface pressure is released, there is a rolling resistance of the roller on the horizontal surface of the surface pressure bar, but it is slight, and when the roller is applied to the slope of the surface pressure bar, the roller is covered by the spring force.
Is pushed back, and the existing slide gate
It can be used as it is without any special improvement such as increasing the thrust of the plate sliding cylinder. or,
The slide block is guided by the guide groove, and
Since the cylinder is slidably connected to the cylinder via the T-slot, the eccentric bending moment accompanying the surface pressure load and release is not transmitted to the piston rod of the cylinder. Furthermore, the surface pressure load operation compresses the spring on the inclined surface of the hook-shaped surface pressure bar,
Play the refractory until the amount of compression of the spring is determined on the horizontal plane at the top.
The pressure applied to the load becomes constant. For example, according to the present invention, it is not necessary to add a new actuator with a wide space, and it is possible to easily apply a contact pressure only by a switching operation of a contact pressure link which can be easily applied to an existing device. , A slide gate which can be released.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a two-layer slide gate showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line A in FIG.

FIG. 3 is a plan view taken along line BB of FIG. 1;

FIG. 4 is a side view taken along the line CC in FIG. 3;

FIG. 5 is a side view showing an example of the surface pressure bar of the present invention.

FIG. 6 is an explanatory view of releasing the surface pressure of the slide gate according to the present invention.

FIG. 7 is an explanatory view of a surface pressure load of a slide gate according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Slide gate apparatus 2 Molten steel container 3 Bolt 4 Fixing bracket 5 Housing 6 Upper plate 5a Fin-like projection 7 Depression 8 Slider 9 Slide block 10 Cylinder 11, Piston rod 12
T-type head 13 T-type groove 14
Hammer head 15 T-shaped groove 16
Guide plate 17 Slide plate 18
Recess 19 Lower nozzle 20
Lower nozzle holder 21 Cover 22
Hinge pin 23 Slider guide 24
Upper nozzle 25 Compression coil spring 26
Spring case 27 Bolt 28
a, 28b Roller 29a, 29b Link 30
a, 30b Roller 31 Hook-shaped surface pressure bar 32
Connection bracket 33 Surface pressure link 34
Hinge pin 35a, 35b, 36, 37a, 37b Projection 38 Retaining stopper 39
Positioning stopper

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 41/40 B22D 11/10 340

Claims (1)

(57) [Claims] 1. A housing fixed to a bottom surface of a molten steel container, and a cover openably and closably provided on a lower surface of the housing, and a plurality of refractory plates are charged and held in a space surrounded by the housing and a cover. In a slide gate in which one of them is slid to control the opening degree of a nozzle gate, a fin-shaped protrusion is provided in a direction orthogonal to a sliding direction of a slide plate of a housing, and an upper surface of the protrusion is provided. A spring case having a spring inside is provided, and links extending below the fin-shaped protrusions are provided at both ends of the spring case, rollers are attached to the lower portions of the links, and further, when the cover is closed. , set only a spring case facing the movable surface pressure bars are guided in the cover at a position across the fin-shaped protrusions, the rotation allowed provided the surface pressure bar side
Surface pressure link and projections on the slide block
Selectively connected to the slide block more surface pressure bar, using a cylinder for sliding plate sliding, with coupling the housing and the cover by engaging the roller by moving the surface pressure bar, slide A surface pressure load device for a slide gate, wherein a surface pressure by a spring is applied to a plate.