JP3029949B2 - Tapping section of molten metal holding furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapping section of a molten metal holding furnace, and more particularly, to a nozzle forming an outlet portion for sending a molten metal accommodated in a molten metal accommodating section downward to the outside of the furnace, and a nozzle above the nozzle. A stopper rod slidably disposed in a vertical direction at a position, and based on the sliding movement, switching between a contact state of the distal end portion of the stopper rod with respect to the nozzle and a separation state thereof to perform the exit portion. And a tapping section of a molten metal holding furnace configured to open and close.

[0002]

2. Description of the Related Art A tapping portion of a conventional molten metal holding furnace is provided with a stopper.
-Up and down movement by sliding the rod up and down linearly
A device is provided, and the stopper rod is
Linear up / down sliding movement, the tip of the stopper rod
Parts is brought into contact with nozzle or close the outlet component with (hereinafter, this
Is called the hot water stop state), the tip of the stopper rod
Open the outlet by separating the end from the nozzle (refer to
Below, and the state will keep in tapping state) to.

[0003]

The above-mentioned conventional molten metal holding furnace
Switch from hot-water supply stop state to hot-water supply state at hot water supply section
If you can change the position of the nozzle,
-Slide the rod linearly upward with the lifting device
The tip of the stopper rod from the nozzle.
It is important that the stopper rod
The molten metal has solidified between the tip and the nozzle,
The tip of the par rod and the nozzle are adhered with solidified molten metal
, Slide the stopper rod upward with the lifting device
Stopper rod does not move even if you try to move it
May not be able to switch to hot water.
You. Also, the tip of the stopper rod and the nozzle adhere to each other.
The stopper rod with the lifting device
And then switch to the hot water state, the stopper
The pulling force between the rod tip and the nozzle
And the tip of the stopper rod and the nozzle are largely missing
Switch from tapping state to tapping stop state again
May not be possible. The present invention has been made in view of the above circumstances.
It has been done and changed from the hot-water supply stop state to the hot-water supply state.
When switching, the tip of the stopper rod and the nozzle
Even if they are adhered, the tapping state is stopped again from the tapping state
Switch to hot water state when it can be switched to
The purpose is to be able to.

[0004]

SUMMARY OF THE INVENTION A feature of a tapping part of a molten metal holding furnace according to the present invention is that a nozzle constituting an outlet part for sending a molten metal accommodated in a molten metal accommodating part downward to the outside of the furnace, and a nozzle thereof. A stopper rod disposed at an upper position so as to be slidable in the up and down direction, and based on the sliding movement, switching between a contact state of the distal end portion of the stopper rod with respect to the nozzle and a separated state thereof to perform the exit. a tapping portion of the molten metal holding furnace is arranged to open and close the portion, and a lifting device for vertically driving the stopper rod, before with the elevating operation by the lifting device
A swing mechanism for swinging the stopper rod in the lateral direction is provided, and a driving force for raising the stopper rod is transmitted via a spring to a transmission mechanism for transmitting the driving force of the lifting device to the stopper rod. In that a mitigation mechanism is provided.

[0005]

[Action] Over the tip of the stopper rod and the nozzle
The melt is solidified and the tip of the stopper rod and the
Switch from the hot-water supply stop state where the heater is bonded to the hot-water supply state
Raise the stopper rod with the lifting device
And the tip of the stopper rod is adhered to the nozzle
So that the stopper rod swings
Spring until the tip of the upper rod separates from the nozzle
The spring gradually deforms elastically, and the elastic restoring force of the spring
At the bonding part between the tip of the stopper rod and the nozzle
The bending moment and tensile force generated gradually increase,
Depending on the degree of adhesion between the tip of the stopper rod and the nozzle
The end of the stopper rod
The part moves so as to pry at the bonding site with the nozzle,
The attachment site can be easily peeled off.

[0006]

Therefore, the state is switched from the hot-water supply stopped state to the hot-water supply state.
When replacing, the tip of the stopper rod and the nozzle
Even if the pieces are glued, a song of the size according to the degree of gluing
Force and tensile force are generated at the bonding site,
Make sure that the tip of the par rod is prying at the bonding site with the nozzle
, And the adhesive part can be easily peeled off,
If the tip of the stopper rod or the nozzle is largely missing
It decreases, and again, from hot water supply state to hot water stop state
Switch to hot water state when you can switch
be able to.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a molten metal holding furnace provided with a tapping section according to the present invention. In the figure, reference numeral 1 denotes a container-like molten metal storage section formed of a circular shape in plan view using a refractory, and the upper surface of the molten metal storage section 1 is provided with a lid 2 formed of a refractory. The lid is sealed to the outside. The inside of the molten metal storage unit 1 in which the sealing has been performed is maintained in an inert atmosphere in which Ar gas is introduced from an Ar gas introduction unit (not shown) to prevent the impurity gas from being melted into the molten metal. (I.e., the molten metal and the lid 2
(An intermediate position between the two), and is appropriately heated to a temperature by a carbon heater 3 installed in a horizontal posture. The molten metal used for casting the cast steel is accommodated therein while being appropriately heated and maintained by the carbon heater 3.

A part of a side wall of the molten metal storage portion 1 projects in a rectangular shape in a plan view, and the projected portion forms a tapping portion 4 for sending out the molten metal in the molten metal storage portion 1 to the outside of the furnace. Have been. The upper surface of the tapping portion 4 is also covered with a fire-resistant cover plate 5 to seal the outside. The tapping section 4 includes a zirconia carbon nozzle 6 that constitutes a cylindrical outlet portion that sends the molten metal downward to the outside of the furnace, and a zirconia carbon stopper rod 7 that is slidably disposed vertically above the nozzle. Based on the sliding movement, the contact state of the tip end of the stopper rod 7 with the nozzle 6 and the separation state thereof are switched to open and close the nozzle 6 as the outlet portion.

The stopper rod 7 is configured such that the driving force of the elevating device A is transmitted to the stopper rod 7 via a transmission mechanism D, and the stopper rod 7 is vertically slid by the driving force. Further, the transmission mechanism D is provided with a relaxation mechanism E for reducing transmission of the driving force. Further, the transmission mechanism D is provided with a swinging mechanism B for swinging the stopper rod 7 in the lateral direction in accordance with the lifting and lowering operation of the stopper rod 7 by the lifting and lowering device A.

[0010] Specifically, as shown in FIG. 1 and FIG.
The lower portion 20b is connected to the rod 10a of the air cylinder 10 for emergency drive of the stopper rod 7, and the window 2 is provided at the center portion.
The motor mounted on the top 20d of the elevating plate 20 on which the opening 0a is opened (more specifically, on the mounting plate 20e attached to the top 20d so as to extend horizontally from the top 20d toward the melt accommodating section 1). 22.

The transmission mechanism D, as shown in FIGS. 1 and 2, specifically, controls the lifting screw member 23 based on a driving force from the output shaft of the motor 22 around a horizontal axis. A screw jack 24 for rotating around an axis along the elevating plate 20, and traveling nuts 26A, 26 externally fitted to upper and lower portions of the elevating screw member 23;
B (as shown in FIG. 3, the traveling nuts 26 </ b> A and 26 </ b> B are rotated by the elevating screw member 23 while being stopped by the rotation stopper member 14, so that the screwing height with the screw member 23 is increased. Moves up and down based on the vertical change), and the vertical position is regulated, and
An upper spring 25A and a lower spring 25B arranged in an up-and-down cascade state so as to be respectively fitted to an upper part and a lower part of the lifting screw member 23, between the two springs 25A and 25B; An intermediate portion 9b is connected to an upper end portion of a rectangular tubular body 9A (or a prism-shaped body) having a base end portion 9a sandwiched and extending vertically, and a distal end portion 9d is provided at an upper end portion of the stopper rod 7. And a connecting member 9 connected thereto. The base end 9 of the connecting member 9
After passing through the window 20a of the elevating plate 20, a is sandwiched between the springs 25A and 25B.

The upper spring 25A and the lower spring 25B are arranged such that a small-diameter spring is accommodated in a large-diameter spring, and the relaxation mechanism E is formed by a combination of both springs 25A and 25B. Is configured.

The rectangular cylindrical body 9a (or prismatic body) is guided by two types of rollers 11 and 12 on opposite sides (both sides on the inside of the furnace and the inside of the furnace). Thereby, the slide movement can be performed in a substantially vertical direction. By the way, the two types of rollers 1
One of the rollers 11, 12 (the roller 11 located closer to the outside of the furnace) rotates around its axis with respect to a rotation shaft 11 a fixed to a roller mounting portion 8 attached to the tapping portion 4. Mounted so that you can. Further, the other roller 12 can rotate around its axis with respect to a rotation shaft disposed in a state of being biased outward from the furnace by a spring 13 whose base end is fixed to the roller mounting portion 8. It is attached to. These two types of rollers 11, 12
The rectangular tube-shaped body 9a of which the opposing side surface is contacted and guided by
The elevating operation is performed in a state of swinging in the lateral direction, and the driving force of the elevating device A is transmitted through the transmission mechanism D that includes the rectangular tubular body 9a that swings in the lateral direction as a part. The stopper rod 7, which moves up and down, swings in the horizontal direction along with the up and down operation. That is, the rocking mechanism B is configured by a combination of the roller 11 mounted at the fixed position of the roller mounting portion 8 and the roller 12 urged in the furnace direction by the spring 13. I have.

In the tapping section of the molten metal holding furnace having such a configuration, when the stopper rod 7 is stopped at the contact position, the inertia of the stopper rod 7 which is slid downwardly is maintained by the upper spring. It is absorbed by the relaxation mechanism E composed of the lower spring 25B and the lower spring 25B. Further, even if the vertical position of the stopper rod 7 is not adjusted so accurately,
Due to the presence of the relaxation mechanism E, the distal end of the stopper rod 7 stops in a state in which the tip end of the stopper rod 7 is vertically versatile in response to contact with the nozzle 6, and the stopper rod 7
Is effectively brought into contact with the nozzle 6. Further, when switching from the hot-water supply stop state to the hot-water supply state, the stopper rod 7 is raised while being swung in the lateral direction by the swing mechanism B.
As a result, the stopper rod 7 at the time of the switching
Can be smoothly separated from the nozzle 6. Further, in the state where the tapping stop cannot be performed normally, the air cylinder 10 is urgently driven to lower the elevating plate 20 on which the motor 22 is mounted, thereby urgently lowering the stopper rod 7, and the emergency lowering is performed. , Emergency hot water can be stopped.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a tapping section according to the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a cross-sectional view showing the main part.

FIG. 4 is a longitudinal sectional view showing a molten metal holding furnace provided with the tapping section.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Molten metal accommodation part 6 Nozzle 7 Stopper rod 25B Spring A Elevating device B Swing mechanism D Transmission mechanism E Relaxation mechanism

Claims (1)

(57) [Claims] 1. A nozzle (6) constituting an outlet portion for sending a molten metal accommodated in a molten metal accommodating portion (1) downward to the outside of a furnace, and is disposed at a position above the nozzle so as to be slidable in a vertical direction. A stopper rod (7) for switching the state of contact of the tip of the stopper rod (7) with the nozzle (6) and the state of separation thereof based on the sliding movement to open and close the outlet portion. The elevating device (A) for vertically moving the stopper rod (7) and the elevating operation by the elevating device (A).
Swing to swing the stopper rod (7) in the lateral direction
Provided with a mechanism (B), the driving force of the lifting device (A) to the transmission mechanism (D) for transferring said to stopper rod (7), drive raises the stopper rod (7)
A tapping section of a molten metal holding furnace provided with a relaxation mechanism (E) for transmitting power via a spring (25B) .