JPH11254126A - Bearing load device of slide gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release a bearing load with an other method not requiring a cost in the case a main cylinder is turned to inoperative by detachably arranging a bearing load imparting device which releases a bearing load with disengaging a slider from a main cylinder irrelevant to a sliding load of the slider. SOLUTION: When a bearing load is not released with using a cylinder 10, by demounting a bearing load link 33 and approaching an emergency bearing load release cylinder to a C shape bracket 5a of a housing end part, pins are inserted from an opening 5b. A distance between two pins is made equal to a distance of two pairs of the C shape brackets 5a, 32a, by turning the cylinder, the pins are accommodated in the C shape brackets 32a, by turning a working direction of two faces of the pins so as to align to a axial direction of the emergency bearing load releasing cylinder, the cylinder is mounted to a slide gate. When supplying a pressurized oil, a cylinder rod of the emergency bearing load releasing cylinder is retracted, a joining fixture 32 to joined thereto and a bearing load bar are moved a right side, the bearing load is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface pressure load device for a slide gate mounted on the bottom of a molten steel container such as a ladle or tundish when molten steel is poured into a mold of a continuous casting machine. More particularly, the present invention relates to a surface pressure load device for a slide gate having a detachable emergency surface pressure load release unit in addition to a normal surface pressure load release unit.

[0002]

2. Description of the Related Art Conventionally, in a continuous casting facility, a slide gate is provided at a tap hole of a molten metal container to control a flow rate of molten steel. The slide gate is mainly composed of a pair of refractory plates constituting the gate and a mechanism for holding and driving the refractory plate, and adjusting the gate opening by sliding one of the refractory plates,
The tapping speed is controlled. The refractory plate is used to overcome the static pressure of the molten metal and to close or squeeze the tapping of the metal to control the flow rate thereof. Is preventing.

For this reason, in a general slide gate for a molten metal container, the surface pressure between the plates is several kgf / cm ² per unit area of the refractory plate.
The force applied to the entire refractory is usually 2-3 tons to 10 tons
onf. On the other hand, the refractory of the slide gate is exposed to high-temperature molten metal and is severely worn, and is replaced every several hours of use. 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, molten metal will leak from between the plates,
If it is too high, the sliding resistance of the slide gate will be large and it will malfunction, leading to serious accidents such as the inability to remove molten steel in the container. Therefore, adjustment of the surface pressure load is extremely important work.

Conventionally, various mechanisms have been proposed as a surface pressure load of a slide gate and a device for releasing the surface pressure so as not to cause a work error or individual difference. Among them, as a device for loading and releasing the surface pressure of the slide gate by using the reciprocating motion of the main cylinder, for example, Japanese Patent Publication No. 1-38592, JP-A-6-226430, JP-A-8-117985, or JP-A-8-117985 There is an apparatus disclosed in each of the publications such as JP-A-9-122899. Since all of these devices use the reciprocating operation of the main cylinder, there is no need to add a new actuator or the like to the slide gate, and the refractory can be replaced using the hydraulic device that is the power source as it is. There are advantages.

[0005]

In the above-mentioned conventional apparatus using the main cylinder, the sliding unit (sliding metal frame or slider, etc.) and the cylinder are connected to each other when the contact pressure is applied or released. As long as the proper cylinder size and hydraulic pressure source are maintained during normal operation of the gate, no problem occurs. However, in the rare case of an operation accident or failure of a drive system such as a cylinder, the following inconvenience occurs.

As described above, two or three slide gates are provided at the bottom of a molten metal container, for example, a ladle for steelmaking.
This device removes or stops molten steel by pressing the perforated refractory plates with appropriate pressure, keeping the molten steel from leaking from between the plates to the outside, and changing the relative positions of the holes. Insufficient pressing force due to temporal deformation and wear of parts related to pressure springs and contact pressure load, abnormal damage to refractories, molten steel between plates due to oxygen lancing work for opening at the start of removal Although very rarely, a problem of molten steel flowing out from the sliding surface of the plate to the side surface, that is, so-called steel leakage occurs due to the insertion or the like.
When steel leakage occurs, close the gate and stop casting.If the leakage is small, wait for the leaked metal to solidify, tilt the ladle and transfer the molten steel in the ladle from top to another container. However, since the leaked molten steel penetrates and solidifies in a gap such as a guide portion of the opening / closing frame (cover) with respect to the sliding metal frame (slider), the relative movement between the opening / closing frame and the sliding metal frame is not possible in a normal cylinder. It becomes difficult.

Also, depending on the rough surface condition of the sliding surface of the plate, the molten steel inserted between the plates during the casting may solidify in a short time after the completion of the casting and act as an adhesive. When pressure operation is required, sliding may not be possible. According to the embodiments described in the above publications, when the slide plate cannot move relative to the upper plate, that is, the sliding frame or slider for fixing these plates inside cannot move with respect to the fixed frame or the housing. , The contact pressure cannot be released. JP-A-6
In the first embodiment of Japanese Patent Publication No. 226430, the surface pressure can be released by moving the opening / closing frame even if the sliding frame is fixed, so that the sliding frame can be moved relative to the opening / closing frame. That is, if the leaked steel does not flow into the sliding gap and becomes immovable, the surface pressure can be released, but if the relative movement becomes impossible, there is no method of releasing the surface pressure.

In the embodiment described in Japanese Patent Application Laid-Open No. H8-117985, the surface pressure bar is not connected to the driving device. Is pulled out until it is applied to the slope of the surface pressure bar, thereafter the surface pressure bar is pushed out by the horizontal component of the spring force given by the slope, and the surface pressure can be released. However, for large slide gates,
At this time, the energy stored in the spring is released at once, which is accompanied by an unpleasant shock.

[0009] In addition, the operation of the hydraulic cylinder becomes inoperable due to damage to the packing and the like, and the output is reduced is unavoidable in the actual operation. When the refractory is replaced after completion, the sliding resistance is several tens due to solidification of molten steel between the plates.
In many cases, it increases by 0%, and even if it operates without any problem during casting, it may become impossible to slide when replacing the refractory. At the time of such a decrease in the cylinder output or at the time of an increase in the sliding resistance, a problem occurs that is not different from that at the time of the steel leakage accident.

[0010] Even when the cylinder cannot be operated, a method disclosed in Japanese Patent Laid-Open No.
In the first and second embodiments of Japanese Patent Publication No. 430, the surface pressure can be released by moving only the opening and closing metal frame without moving the sliding metal frame. It requires tons of force to overcome the frictional force, which is not practical.

If the surface pressure cannot be released for the reasons described above, the least expensive part and the part with good workability among the devices are selected, and the surface pressure is released by performing gas cutting or the like. Remove the refractory and use the healthy parts of the equipment to replace damaged or cut products to prepare for the next operation. That is, for example, the pin 52 (FIG. 2) disclosed in Japanese Patent Publication No. Hei.
In Japanese Patent No. 30, there is disclosed an engaging element 10, a bracket 9d,
In -122899, the bracket 1b and the like are to be cut. (Note that, in Japanese Patent Application Laid-Open No. H8-117985, the above-mentioned burl operation is performed, but it is not conceivable that the link 29 may be cut.) If such a cut is made, it is not easy to recover the apparatus, and the apparatus is periodically removed. The ladle preparation time, which is operated in minutes, cannot be made in time, which hinders the productivity of steelmaking plants. Alternatively, a separately prepared ladle is used, and the ladle to which the slide gate that has caused the failure is attached is suspended and sent for repair. Also in the cutting operation, there is a danger and a shock when the energy stored in the spring is released.

In order to avoid sliding failure, it is conceivable to employ a large-capacity cylinder which can be operated even in the case of a minor trouble. However, the hydraulic source is increased in size so that it can withstand the hydraulic pressure in an emergency. It is necessary to increase the strength of each part to which the driving force reaches, which increases the cost.

As described above, in the conventional apparatus described above,
The surface pressure cannot be released in the case of operation troubles such as inevitable leakage of steel, or in the case of sliding failure due to cylinder troubles or ingots between plates. In order to release surface pressure in case of emergency, it is necessary to cut and destroy some devices,
Although there is an advantage in terms of protection and utilization of main components, restoration parts costs and restoration work costs are incurred, raising operating costs. Since it takes time for restoration, factory operation is hindered. Unsteady work such as cutting and bar operation is dangerous because it involves a shock when the surface pressure is released. In order to shorten the recovery time, it is necessary to always prepare a spare ladle, which requires extra costs such as a ladle storage place and preheating and heat keeping costs. Although the cylinder can be made larger to solve the above-mentioned problems, it is necessary to increase the size of the hydraulic power source and to increase the strength of each driven part, which is not economical.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and the operation of loading and releasing the surface pressure of the slide gate can be easily performed by using the reciprocating operation of the main cylinder, and the operation of the main cylinder becomes inoperable. Another object of the present invention is to provide a surface pressure load device for a slide gate which can quickly release the surface pressure by another means even in an emergency.

The present invention also provides a surface pressure load device for a slide gate which ensures safety by preventing surface pressure from being erroneously released except during the operation of surface pressure load / release, and which does not require a large cost. Is to do.

[0016]

According to the present invention, a reciprocating sliding drive mechanism of a slidable refractory plate provided at the bottom of a molten steel container, a fixed-side refractory plate and a sliding-side refractory plate are provided. A surface pressure load mechanism for applying a surface pressure between the object plates is selectively connected to a surface pressure load device for a slide gate capable of applying and releasing the surface pressure load, so that the device is independent of the sliding load of the slider. There is provided a slide gate surface pressure load device capable of releasing the surface pressure load by separating the slider from the main cylinder, or a slide gate surface pressure load device in which an emergency surface pressure release means is detachably provided. You.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. Referring to FIGS. 1 to 5, a slide gate device 1 includes a housing 5 attached to a bottom portion of a molten steel container 2 by bolts 3 and fixing brackets 4.
The housing 5 has a recess 7 for accommodating the upper plate 6 and a slide block 9 at one end.
A gate control cylinder (main cylinder) 10 for driving the slider 8 via the slider is mounted. The slider 8 and the slide block 9 are connected to the cylinder 10
T-type head 12 attached to the end of a piston rod 11
And a T-groove 13 provided in a slide block 9 fitted to the head 12 to join the slide block 9 and the cylinder 10 together, and a hammer-shaped head 14 provided on the slider side of the slide block 9. And the T-shaped groove 15 provided in the slider 8 are fitted to each other, and the slider 8 and the slide block 9 are connected to each other.
0 is connected. 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 an upper surface, and a lower nozzle holder 20 for mounting a lower nozzle 19 on a lower portion. The cover 21 is connected to the housing 5 by a hinge pin 22 so as to be openable and closable, and the cover 21 and the slider 8 can be integrally opened and closed like a door around the hinge pin 22. A sliding surface is formed on the upper surface of the cover 21, and the slider 8 is slidably mounted on the sliding surface. 23 is a slider guide provided on the upper surface of the cover 21 so as to protrude toward the slider 8, and 24 is an upper nozzle.

Next, the portion of the surface pressure load will be described.
The surface pressure load device is provided on a side surface of the housing 5.
That is, a fin-shaped protrusion 5c is provided on the side surface of the housing 5, and a compression coil spring 25 is provided on the molten steel container 2 side of the protrusion 5c.
Are mounted by bolts 27. Links 29a and 29b having rollers 28a and 28b are attached to both ends of the spring case 26. Further, rollers 30a and 30b are provided on both sides of the cover 21.
Hook-shaped surface pressure bar 3 that moves while being guided by 0a and 30b
1 is provided as a pair.

The pair of surface pressure bars 31 have their ends on the cylinder 10 side connected by connection fittings 32, thereby forming a generally U-shape in plan view. One end of a U-shaped surface pressure link 33 extending toward the cylinder 10 is pivotally connected via a hinge pin 34 to the center of the connection fitting 32, and a side of the surface pressure link 33. Are provided with projections 35a and 35b on the outside.

On the other hand, on the lower surface of the slide block 9, one projection and two projections 36, 37a and 37b are provided at a central portion at intervals in the direction of expansion and contraction of the cylinder 10. The surface pressure link 33 and the protrusions 35a and 35b provided on the surface pressure link 33 and the protrusions 36, 37a and 37b provided on the slide block 9 adjust the position of the slide block 9 by the cylinder 10 as described later. In addition, the surface pressure link 33 is selectively engaged by rotating the surface pressure link 33, and the expansion and contraction of the cylinder 10 is controlled by the surface pressure link 3.
3 to the surface pressure bar 31 to load and release the surface pressure. 38 is a stopper for preventing the surface pressure bar 31 from coming off, and 39 is a stopper for positioning the slider 8.

The connecting fitting 32 is provided with a pair of C-shaped brackets 32a having openings 32b. Surface pressure link 3
3 has a hinge pin 34 fixed to the surface pressure link by a method not shown, the diameter of the hinge pin 34 is determined so as to slide to the inner diameter of the C-shaped bracket 32a, and both ends of the hinge pin 34 are machined on two sides. , Its width across two sides is 32b
When the surface pressure link 33 is turned by 90 ° from the normal use state (FIGS. 5 and 6), the connection fitting 32 is determined.
And, in normal use, are coupled with a small sliding gap.

On the other hand, in the vicinity of the end surface of the housing 5 on the mounting side of the gate control cylinder 10, a similar C-shaped bracket 5 is provided at a position facing the C-shaped bracket 32a.
a is provided. Reference numeral 40 denotes an emergency surface pressure releasing cylinder. A pin 41 having a two-sided surface similar to the hinge pin 34 is fixed to an end of the head side, and can be connected to the housing 5 by a C-shaped bracket 5a of the housing 5. Has become. A rod end 42 is attached to the cylinder rod 40a, and a rod end pin 43 having a turning means (not shown) and having a double-faced end is pivotably assembled to the rod end. The diameter and the width of the two surfaces of the rod end pin 43 are substantially the same as those of the hinge fins 34, and can be connected to the C-shaped bracket 32a attached to the connection fitting 32.

The direction of machining of the two surfaces of the cylinder mounting pin 41 is made coincident with the axial direction of the cylinder. When a load is applied to the cylinder, the cylinder mounting pin 41 is connected to the housing 5 without backlash, and the turning operation of the rod end pin 43 is performed as described later. As a result, it does not fall off the slide gate during operation.

FIG. 9 is a front sectional view of a slide gate device showing another embodiment of the present invention, and FIG. 10 is a bottom view showing an E-view surface near the slide block 9 'in FIG. The slide block 9 'of this embodiment is provided with a hole 9'a parallel to the axial direction of the cylinder 10 and a slot 9'b for inserting a cotter orthogonal to the hole 9'a.
7a and 37b, and the T-type head 12 is fitted into one end. The hammer-shaped head 14 ′ has a cotter insertion hole 14 ′ a in a shaft portion, and
The cotter 45 is inserted into the hole 9'a provided in the ', and the tip is attached to the bottom of the hole with a cotter 45. When the cotter 45 is driven in, the hammer-shaped head 14' is firmly fixed to the slide block 9 '. When it comes off, the mallet head 14 'and the slide block 9' move in the axial direction of the cylinder 10 and separate.

Next, the surface pressure operation during normal operation will be described. First, the surface pressure link 33 is detached from the slide gate 9 so that the surface pressure is not accidentally released when the surface pressure release is unnecessary such as during the removal of molten steel from the ladle. Note that the surface pressure link 33 may be maintained at an angle at which the surface pressure link 33 is not connected to the projection 36 of the slide block 9 as shown by the dashed line in FIG. When carrying out the surface pressure load operation, the surface pressure link 33 is brought close from the lower side of the slide gate 9 as shown by the solid line in FIG. Then, the link pin 34 is inserted from the opening 32b of the C-shaped bracket 32a by using a notch having a two-sided width, and is connected to the connection fitting 32. After that, the above-mentioned Japanese Patent Application Laid-Open No.
The operation is performed in the same manner as in the method described in JP-A-7985. Hereinafter, this operation will be described.

Slide plate 1 after refractory replacement
7, the cover 21 is closed like a door, 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 operated to move the slide plate 17 in the closing direction as shown in FIG. Then, 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 advance the surface pressure bar 31 to the left side in the drawing via the connection fitting 32, so that the surface pressure is reduced. The spring case 26 is attracted by the inclined surfaces 31a and 31b of the bar 31 via the rollers 28a and 28b and the links 29a and 29b, 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 and removed, or the surface pressure link 33 is tilted so that the projections 37a and 37b of the slide block 9 do not contact the projections 35a and 35b of the surface pressure link 33. If it is, the compression state of the coil spring 25 is kept constant, and a stable surface pressure load is maintained.

When the surface pressure load is released by using the gate control cylinder 10, the surface pressure link 33 is attached. Then, as shown in FIG. 6, the cylinder 10 is operated to move the piston rod 11 to the retreat limit. That is, the surface pressure link 33 is rotated from the inclined state in FIG. 1 to a position substantially parallel to the bottom of the molten steel container in FIG. 6 while stopping near the opening limit of the slide plate 17. Next, when the cylinder 10 is operated to retract the piston rod 11, the projection 36 provided on the slide block 9 is hooked on the lateral member of the surface pressure link 33. 32
, The hook-shaped surface pressure bar 31 moves in the direction of the cylinder 10 (pulls out), the compression of the coil spring 25 is released,
The surface pressure between the refractory plates (upper plate 6 and slide plate 17) is released.

At the same time as the surface pressure is released, the tip of the surface pressure bar 31 is released from engagement with the rollers 28a and 28b. For this reason, the cover 21 which has been substantially fixed to the housing 5 via the surface pressure bar 31 and the links 29a and 29b is separated from the housing 5, and the cover 21 and the slider 8
Can be opened and closed like a door.

Reference numeral 38 denotes a surface pressure bar stopper provided on the cover 21, 39 denotes a slider positioning stopper provided on the slider 8, and 46 denotes a stopper contact against the slider positioning stopper 39, which is provided on the cover 21 so as to be adjustable in position. ing. This operation will be described. In a normal refractory replacement operation, the molten steel container is turned over by 90 °, and the bottom surface of the molten steel container is made vertical. Therefore, the cover 21
When the slider 8 is opened like a door, the slider 8 tries to descend (move) toward the cylinder 10 by its own weight.
Since it is regulated by the slider positioning stopper 39 and the stopper abutment 46 set at a position slightly retracted from the stroke retraction limit of 0, the slider stops at a predetermined position. In addition, the surface pressure bar 31 is stopped by being restricted by the surface pressure bar retaining stopper 38 and does not fall off.

If it is not possible to release the surface pressure using the cylinder 10, the following operation is performed. First, the surface pressure link 33
If is attached, remove the surface pressure link 33,
The emergency surface pressure release cylinder 40 is made to approach the C-shaped bracket 5a at the housing end from the mounting pin 41 side, and the pin 41 is inserted through the opening 5b. Then, the two pins 41 and 43 are The distance is adjusted according to the distance between the two pairs of C-shaped brackets 5a and 32a.
0 in the clockwise direction in FIG.
The cylinder 40 is attached to the slide gate when the pin 43 is housed in the mold bracket 32a and turned so that the two-side machining direction of the pin 43 is aligned with the axial direction of the emergency surface pressure releasing cylinder 40.

Next, the sending pressure oil to the P ₁ side, the cylinder rod 40a of the emergency surface pressure releasing cylinder 40 is retracted, the connecting fitting 32 for coupling thereto, the surface pressure bar 31 moves to the right, surface The pressure is released. At this time, the advance of the aperture 44 provided in the head-side hydraulic connection port P ₂ side, the surface pressure bar 31 is pressed to the compression coil spring 25 absorbs energy to be jump out, it can be slowly operated. In addition,
The above is an example in which the surface pressure link 33 is removed and the emergency surface pressure release cylinder 40 is attached. However, if the surface pressure link 33 and the surface pressure release cylinder 40 are configured to operate without interference, The pressure link 33 may be left attached.

When the surface pressure release is completed, the emergency surface pressure release means is removed from the slide gate, the cause of the malfunction of the slider 8 or the gate control cylinder 10 is eliminated, and if necessary, replacement of worn or damaged parts is performed. Then, the slide gate is restored to the normal operable state. The emergency surface pressure release cylinder 40 may be removed in the reverse procedure of the mounting.

The pulling load applied to the emergency cylinder 40 can be obtained by simply pulling out the surface pressure bar 31 in parallel, and the output of the gate control cylinder 10 can be several to 10%.
The rollers 28a, 2 which are front and rear and engage with the surface pressure bar 31
8b, the load when the surface pressure bar 31 is pulled out until it is pushed out is the horizontal component of the compression reaction force of the compression coil spring 25 due to the slope of the surface pressure bar 31. 20% to 3 of output of cylinder 10
0% and the emergency cylinder 4
The stroke of 0 indicates that the surface pressure bar 31 is
When the surface pressure bar 31 is retracted to the maximum extension position, the load is not applied to the surface pressure bar 31. Thereafter, when the surface pressure bar 31 is retracted manually, the cover can be opened and closed.
It may be about 0 mm. Therefore, the emergency cylinder 40
The gate control cylinder 10 can be made smaller and lighter than the gate control cylinder 10, and can be easily attached and detached by hand.

The emergency surface pressure releasing means may be provided at one slide gate refractory replacement place for handling several to about 20 slide gates, and the output of the cylinder 10 is increased to prepare for emergency. It is economical. Also,
Since it is not permanently installed on the slide gate, it is not affected by heat from the tundish or mold, and does not interfere with other equipment during ladle operation and is not damaged. In addition, the emergency surface pressure releasing means is not limited to the above-described hydraulic cylinder, but performs a linear motion mechanism such as a screw jack.
The required tensile force for releasing the surface pressure is obtained, and the surface pressure bar 3
What is necessary is just to be able to receive the force that 1 jumps out. The attachment / detachment means for the emergency surface pressure release cylinder 40 is not limited to the above-mentioned C-type bracket, but may be another means which can be attached / detached by a simple operation.

If the connection fittings of the hydraulic connection ports P ₁ and P ₂ of the emergency surface pressure release cylinder 40 are made to have the same dimensions as the connection fittings of the hydraulic connection port of the gate control cylinder 10, the operation is simple, and It is economical because there is no need to prepare a new hydraulic device.

When the hammer-shaped head 14 'is detachably attached to the slide block 9' as in the embodiment shown in FIG. 9, the operation at the time of normal operation is the same as that shown in FIGS.
Is the same as described above. Hammer head 14 '
When the slider 17 is not slidable and the output of the cylinder 10 is equal to or more than a predetermined value, the state of the slide gate when the slider 17 becomes non-slidable is as shown in FIG.
1 is pushed out and is often near the gate fully closed stroke. When the cotter 45 is extracted by using an extracting means (not shown), the cylinder can be operated in a direction for retracting the cylinder rod 11 (a direction for moving the slide block 9 ′ to the right in FIG. 9). Therefore, the surface pressure link 33 is mounted, and the rod 11 is retracted so that the protrusion 36 is hooked on the lateral member of the surface pressure link 33 as shown in FIG. The slide block 9 'is movable in the rod retreating direction despite the hammer-shaped head 14' being restrained by the slider 8, so that the surface pressure bar is pulled out and the surface pressure is released.

The above is an example in which the hammer-shaped head 14 'and the slide block 9' are joined by using the cotter 45. If the head shape of the hammer-type head 14 ″ as shown in FIG. 11B is a flat type, the head shape of the hammer-type head 14 ″ may be used as shown in FIG. Has a flat head having dimensions of width w and height h different from each other, and is attached to the slide block 9 ″ so as to be able to turn 90 °. When turned 90 °, the flange 14 ″ a is released from the T-shaped groove 15. 9 ″ a in FIG.
4 "detent means, 9" b 90 degree hammer-shaped head 14 "
It is a hand-operated flange for turning. FIG.
(C) shows a specific example of the detent means,
FIG. 4 is an enlarged cross-sectional view at right angles to the axis of the mallet head. A window hole 50 is formed in the slide block 9 ", and a flange 51 is formed on a shaft portion of the hammer-shaped head 14" so as to face the window hole 50. Flat portions 51a are formed at two locations on the periphery of the flange 51 at a 90 ° central angle interval, and a leaf spring 52 is attached to the slide block 9 ″ near the window hole 50. The peripheral portion of the flange 51 of the mallet-type head 14 ″ is pressed against the peripheral portion of the flange 51 with a pressing force. It is to be noted that the rotation stopping means is not limited to the above example, and any other form can be adopted.

FIG. 12 is a plan view showing another embodiment of the slider portion. The slider 8 'of this embodiment has the function of integrating the slider 8, the mallet head 14 and the slide block 9 in FIGS. 1 to 7, and is formed by a cylinder 10 and a T-shaped head 12 in a T-shaped groove 15'. Are combined. 1 to 7, when replacing the refractory (6, 17, 24) incorporated in the slide gate device, the slider 8 and the cover 21 cut off the edge of the hammer-shaped head 14 and the upper plate 6 And slide plate 17
In the embodiment shown in FIG. 12, it is cut off by a T-type head 12 provided at the tip of a piston rod 11 of a cylinder 10.

With the structure shown in FIG.
Is omitted, the guide groove for the slide block is not required, and the guide plate 16 and the housing-side guide surface at a position facing the guide plate 16 are not required, and the apparatus is simplified. When the slider 8 'having the structure shown in FIG. 12 is used, the normal surface pressure operation and the operation using the emergency surface pressure releasing means are possible as in the case of the embodiment shown in FIGS. Although the slide block is omitted in this embodiment, the slider 8 ′ is restrained by the housing 5 via the cover 21 on the lower surface and the plates 6 and 17 on the upper surface during the surface pressure operation. The bending moment is not applied to the rod 11 of the cylinder 10, and the rod 11 can be used in the same manner as a device with a slide block.

[0041]

As described above, according to the present invention, the operation of loading / releasing the surface pressure of the slide gate can be easily performed by utilizing the reciprocating operation of the main cylinder, and the operation of the main cylinder is caused by various causes. In the event that it becomes impossible, the surface pressure can be released by other means that do not require cost, and this emergency surface pressure release means can be detached as well as the normal surface pressure operation means. Can be removed except when the operation is performed, there is no danger of accidentally releasing the contact pressure, and the operation itself can be performed very easily.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a two-layer slide gate device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged plan view taken along the line BB of FIG. 1;

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

FIG. 5 is a sectional view similar to FIG. 1 of the slide gate device according to the embodiment of the present invention when normal surface pressure is released.

FIG. 6 is a cross-sectional view of the slide gate device according to the embodiment of the present invention when a normal surface pressure load is applied.

FIG. 7 is a cross-sectional view of the slide gate device according to the embodiment of the present invention for explaining a surface pressure releasing operation in an emergency.

FIG. 8 is an enlarged bottom view of the emergency surface pressure release cylinder as viewed from the D side in FIG. 7;

FIG. 9 is a front sectional view of a slide gate device showing another embodiment of the present invention.

FIG. 10 is a bottom view showing an E-view surface near the slide block in FIG. 9;

FIG. 11 is a view showing a hammer-shaped head portion according to another embodiment of the present invention.

FIG. 12 is a plan view of a slider portion according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slide gate device 5 Housing 6 Upper plate 8 Slider 9 Slide block 10 Gate control cylinder (main cylinder) 14 Hammer type head 17 Slide plate 21 Cover 25 Compression coil spring 31 Surface pressure bar 32 Connection metal fitting 32b C type bracket 33 Surface pressure Link 40 Emergency surface pressure release cylinder 41 Cylinder mounting pin 45 Cotter

 ──────────────────────────────────────────────────の Continued on the front page (72) Shintaro Matsumoto, Inventor Shintaro 3, Kajima, Ibaraki Pref., Sumitomo Metal Industries, Ltd. Kashima Works, Ltd. (72) Inventor, Yuzo Ogi 5-1-1109, Shimaya, Konohana, Osaka Sumitomo Metal Industries, Ltd.Kansai Works

Claims (4)

[Claims] 1. A reciprocating sliding drive mechanism for a slidable refractory plate provided at the bottom of a molten steel container, and a surface pressure for applying a surface pressure between a fixed-side refractory plate and a sliding-side refractory plate. In a slide gate surface pressure load device that selectively connects a load mechanism and can apply and release a surface pressure, an emergency surface pressure release unit is detachably provided. Surface pressure load device. 2. A reciprocating sliding drive mechanism for a slidable refractory plate provided at the bottom of a molten steel container, and a surface pressure for applying a surface pressure between a fixed-side refractory plate and a sliding-side refractory plate. In a surface pressure load device for a slide gate, which selectively connects a load mechanism to apply and release a surface pressure, a connection between a reciprocating sliding drive mechanism of the refractory plate and a normal surface pressure load release means. A surface pressure load device for a slide gate, wherein the means is detachably provided. 3. The slide gate surface according to claim 1, wherein a connecting means for connecting the reciprocating sliding drive mechanism of the refractory plate and a normal surface pressure load releasing means is detachably provided. Pressure loading device. 4. A reciprocating sliding drive mechanism for a slidable refractory plate provided at the bottom of a molten steel container, and a surface pressure for applying a surface pressure between a fixed-side refractory plate and a sliding-side refractory plate. The reciprocating sliding drive mechanism of the refractory plate includes a slider for accommodating the refractory plate. The slider is detachably connected to a slide block that drives a surface pressure bar for applying / releasing the surface pressure, so that even when the sliding load of the slider becomes excessive, the surface pressure is reduced. A surface pressure load device for a slide gate, wherein the device can be operated.