JPH0465133B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lid opening/closing device for a molten aluminum processing tank.

Molten aluminum before casting contains harmful gases such as hydrogen gas and nonmetallic inclusions such as oxides of aluminum and magnesium. The hydrogen gas and nonmetallic inclusions cause defects in the obtained ingot and products made from this ingot. Conventionally, as a method for removing these, a method has been adopted in which inert gas such as nitrogen gas or argon gas or chlorine gas is blown in the form of bubbles into the molten aluminum placed in a treatment tank. When inert gas or chlorine gas is blown into molten aluminum in the form of bubbles to remove hydrogen gas and nonmetallic inclusions, dross floats to the surface of the molten metal, so it is necessary to remove this dross. One possible method for removing this dross is to provide a dross outlet that can be opened and closed on the peripheral wall of the processing tank, and to pump out the dross from this dross outlet. However, there was a problem that the dross outlet could not be made very large, resulting in poor workability. Furthermore, since it is necessary to make through holes in the peripheral wall of the processing tank, there is a problem in that the strength of the tank is reduced.

The object of the present invention is to provide a lid opening/closing device for a molten aluminum processing tank that solves the above problems.

The lid opening/closing device for a molten aluminum processing tank according to the present invention includes a molten aluminum processing tank including a tank body and a lid that covers the top opening of the tank body, and an elevating body disposed above the processing tank,
The lid is provided with a hanging arm with a hook extending upward, and the elevating body is provided with an engaging claw that can swing freely in the horizontal direction.

In such a configuration, when removing dross, lower the elevating body so that the engagement claw is slightly below the hook, and in this state swing the engagement claw to the engagement position with the hook. let Then, when the elevating body is raised, the hook and claw engage, and the lid is lifted. In this way, the dross can be pumped out from the tank body of the treatment tank. To close the lid, lower the elevating body to cover the tank body with the lid, then lower the elevating body until the claw is below the hook to disengage the two, and then disengage the claw. Rock it until it is in the correct position.

Since the opening/closing device according to the present invention is configured as described above, the lid can be easily removed, and dross can be removed from the top opening of the tank body with the lid lifted. Increased efficiency. Further, there is no need to make a through hole in the peripheral wall of the tank body, and a decrease in strength is prevented.
Furthermore, since the engaging pawl is swingable, when there is no need to lift the lid, it can be swung to a position where it does not get in the way.

This invention will be explained below with reference to the drawings.
In the following description, left and right refer to those toward FIG. 1.

The molten aluminum processing equipment includes a molten aluminum processing tank 1, two vertically long horizontal rails 2 placed above the processing tank 1, and horizontal rails 2.
A traveling body 3 that runs left and right along the road, an elevating body 4 provided on the traveling body 3 that can freely move up and down, and two rotating shafts 5 for blowing processing gas provided in a hanging manner at the lower end of the elevating body 4. It consists of

The treatment tank 1 includes a tank body 7 lined with silicon-bonded silicon carbide ceramics;
It consists of a lid 8 that covers the upper end opening, and the lid 8 has two rotating shaft insertion holes 9 and a plurality of heaters.
A cover insertion opening 10 is formed. A seat 11 for a seal member made of silicon carbide is attached to the rotating shaft insertion port 9, and is integrally provided with an outward flange 11a at the upper end and an inward flange 11b at the lower end. Heat-resistant paper 14 is adhered to the upper surface of the inward flange 11b. The heater cover insertion port 10 has a tapered shape with a diameter decreasing toward the bottom.
A bottomed cylindrical heater cover 12 made of silicon carbide and having a tapered flange 12a at its upper end is inserted and supported. The lower end of the heater cover 12 extends to the vicinity of the bottom of the tank body 7, and an electric heater 13 having a non-metallic heating element is placed inside the heater cover 12. is being heated. Further, each of the four corners of the top surface of the lid 8 is provided with a hanging arm 15 extending upward, and two hooks 16 are mounted on the arm 15 at a predetermined interval vertically.
is provided.

The running body 3 includes a frame 17, a driving wheel 18 attached to the frame 17 and running on the upper rail 2, a motor 19 attached to the frame 17 and driving the wheel 18, and a height corresponding to the upper and lower rails 2. The guide wheel 29 is provided at a horizontal position and rolls along both the front and rear sides of the rail 2. In addition, the running body 3
is equipped with a downward power cylinder 20 that moves the elevating body 4 up and down, and a pair of left and right vertical guide bars 21 that guide the elevating body 4. In addition, the running body 3
When it comes directly above the processing tank 1, it is stopped by a limit switch (not shown).

The elevating body 4 is a piston of a power cylinder 20.
It is attached to a rod 20a, and wheels 22 provided on the left and right sides of the rod 20a roll along a vertical guide bar 21 and move up and down along the guide bar 21. A rotary drive shaft 23 is provided inside the elevating body 4.
is located. The rotation drive shaft 23 is connected to the elevating body 4
By the motor 24 disposed within the motor 24
It is designed to be rotated via a belt pulley 25 attached to the driving shaft, a belt pulley 26 attached to the upper end of the rotary drive shaft 23, and a belt 27 hooked around both the belt pulleys 25 and 26. Furthermore, a processing gas passage 28 is provided inside the rotary drive shaft 23 . Although not shown, a processing gas supply pipe extending from a processing gas supply source is connected to the upper end of this passage 28 via a rotary joint. Engagement pawls 31 that can be engaged with the hooks 16 are provided at both left and right ends of the lower edge of the front surface of the elevating body 4 and at both left and right ends of the lower edge of the rear surface. Each of the engaging claws 31 is attached to a vertical shaft 32 so as to be able to swing freely in the horizontal direction, and is moved to an engaging position (see the solid line in FIG. 3) and a non-engaging position (see the solid line in FIG. 3) with the hook 16 by a claw driving device. (see chain line). The pawl driving device includes an air cylinder 33 with a piston rod 33a facing outward (leftward for the left engagement pawl, rightward for the right engagement pawl), and one end of which is the tip of the piston rod 33a. It consists of a link 34 which is pivotally connected to the vertical shaft 32 and whose other end is fixed to the vertical shaft 32. And air cylinder 33
When the piston rod 33a moves forward, the engagement claw 31 is swung by the operation of the piston rod 33a.
1 comes to the non-engaged position and comes to the engaged position when retracted. Also, inside the elevating body 4, there is an engagement position detection limit switch 35 and a non-engagement limit switch 35 that abut the link 34 to detect the state when the engagement claw 31 reaches the engagement position or the non-engagement position. A limit switch 36 for detecting the alignment position is provided.

The processing gas blowing rotary shaft 5 is connected to the lower end of the rotary drive shaft 23 by a connecting device 40 . Further, the rotating shaft 5 is made of carbon, and has a processing gas passage 4 therein which communicates with the passage 28 of the rotational drive shaft 23.
1 is provided, and a disk-shaped bubble processing gas release member 42 is provided at the lower end. A radial groove 42a is formed on the lower surface of the processing gas release member 42.
is formed. Furthermore, a processing gas outlet 42b connected to the passage 41 is provided on the lower surface of the discharge member 42. Around the upper end of the rotating shaft 5,
The inner diameter is larger than the outer diameter of the rotating shaft 5 and the rotating shaft 5
An annular sealing member 43 made of silicon nitride is arranged, which moves up and down. Annular seal member 43
is attached via four bars 45 to a mounting frame 44 provided between the lower edges of both the front and rear walls 4a of the elevating body 4. The bar 45 is vertically movable with respect to the frame 44, and a stopper 4 is attached to the upper end of the bar 45.
6 allows the lowering position to be determined. The annular seal member 43 is attached to the lower end of the bar 45 so as to be able to move up and down slightly relative to the bar 45. In addition, the annular seal member 43 and the mounting frame 4
A coil spring 47 is attached to the bar 45 between the bar 45 and the annular seal member 43, and constantly urges the annular seal member 43 downward. The annular seal member 43 is fitted with the upper end of a cylinder 48 made of silicon nitride that is fitted over the rotating shaft 5 and is shorter than the rotating shaft 5. A male thread is formed on the outer peripheral surface of the upper end of the cylinder 48, and by screwing this part into a female thread formed on the inner peripheral surface of the annular seal member 43, the cylinder 48 is removably attached to the seal member 43. It is being

In such a molten aluminum processing apparatus, when molten metal is processed, the traveling body 3 is first moved above the processing tank 1. Next, the power cylinder 20 is operated to lower the elevating body 4. Then, the rotating shaft 5 is lowered, and the annular seal member 43 and the cylinder 48 are also lowered, and the rotating shaft 5 and the cylinder 48 enter the processing tank 1 through the rotating shaft insertion port 9. When the rotating shaft 5, that is, the elevating body 4 descends to the lower limit position, the annular seal member 43 is received by the inward flange 11b of the seal member seat 11, and the lower end of the cylindrical body 48 is inserted into the molten aluminum in the tank 1. immersed in. At the lower limit position of the elevating body 4, the coil spring 47 is slightly compressed by the mounting frame 44, so that the annular seal member 43
is urged downward and brought into close contact with the inward flange 11b. Therefore, entry of the atmosphere from between the annular seal member 43 and the seat 11 is completely prevented. Furthermore, since the lower end of the cylinder 48 is immersed in the molten metal, the atmosphere entering through the opening at the upper end of the cylinder 48 also contacts only the part surrounded by the cylinder 48 of the entire surface of the molten metal. Therefore, it is less susceptible to atmospheric influences and processing efficiency is improved. In this state, processing gas is supplied from a processing gas supply source (not shown) to the discharge member 42 via the rotational drive shaft 23 and the processing gas passages 28, 41 of the rotational shaft 5, and the motor 24 supplies the processing gas to the rotational drive shaft 23 and the rotational shaft 5. When the shaft 5 is rotated, the release member 42 is released from the lower end opening of the rotating shaft 5.
The processing gas discharged to the lower surface through the outlet 42b is turned into fine bubbles by the centrifugal force generated by the rotation of the discharge member 42 and the action of the grooves 42a, and is dispersed throughout the tank 1 and discharged. be done. Hydrogen gas and nonmetallic inclusions in the molten aluminum are removed by this processing gas.

After removing hydrogen gas and nonmetallic inclusions in molten aluminum, or when replacing the rotating shaft 5,
Only the rotating shaft 5 needs to be raised. In this case, first operate the air cylinder 33 to advance the piston rod 33a so that the engaging pawl 31 comes to the non-engaging position. In this state, when the elevating body 4 is raised by the power cylinder 20, only the rotating shaft 5 is raised. Further, in order to remove dross floating on the surface of the molten aluminum after hydrogen gas and nonmetallic inclusions are removed, it is necessary to lift the lid 8 slightly. In this case, the rotating shaft 5
, the lifting body 4 is raised until it is at a position higher than the lower hook 16 with the engagement claw 31 in the non-engaged position, and then the engagement claw 31 is moved to the upper hook 16. Before reaching the height position, the air cylinder 33 is operated to retract the piston rod 33a so that the engagement pawl 31 comes to the engagement position. Then, when the elevating body 4 rises and the engagement pawl 31 reaches the height position of the upper hook 16, both 3
1 and 16 are engaged, the lid 8 is lifted, and at the same time as the rotating shaft 5 is raised, the lid 8 is slightly lifted. In this way, dross can be removed from the upper end opening of the tank body 7. When lowering the lid 8, the operation is reversed to that described above. Furthermore, when performing maintenance and inspection work in the processing tank 1, first, when raising the rotating shaft 5, the air cylinder 33 is operated to move the piston rod 33a back and forth before raising the elevating body 4. so that the engaging claw 31 is at the engaging position. Next, elevating body 4
When the lid 8 is raised, the engaging claw 31 engages with the lower hook 16, and when the elevating body 4 reaches the upper limit position, the lid 8
is lifted high. Thereafter, the traveling body 3 is moved along the rail 2 to either the left or right. By doing so, the lid 8 and the rotating shaft 5 will not get in the way during maintenance and inspection work inside the processing tank 1, and workability and safety will be improved. When the lid 8 is placed on the processing tank 1, the operation is reversed to that described above.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view, FIG. 2 is a partially cutaway side view, and FIG. 3 is a partially cutaway side view.
The figure is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 4 is an enlarged sectional view taken along the - line in Fig. 1.
FIG. 3 is an enlarged cross-sectional view taken along the line. DESCRIPTION OF SYMBOLS 1... Aluminum molten metal processing layer, 4... Lifting body, 7... Tank body, 8... Lid, 15... Hanging arm,
16... hook, 31... engagement claw.

Claims (1)

[Claims] 1 Aluminum molten metal processing tank 1 equipped with a tank body 7 and a lid 8 that covers the upper end opening of the tank body 7
The lid 8 is provided with a lifting arm 15 with a hook 16 extending upward, and the lifting body 4 has an engaging claw that can swing freely in the horizontal direction. A lid opening/closing device for an aluminum molten metal processing tank equipped with a 31.