JPS595477Y2 - Inoculant addition device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an inoculant addition device.

For example, when centrifugally casting a cast iron pipe 1 as shown in FIG. 1, as shown in FIG. Molten metal is poured into 2.

At that time, an inoculant is added to the molten metal that is being poured to improve the properties of the casting.

In particular, inoculation performed during casting of ductile cast iron is known to greatly contribute to improving the graphite structure, increasing the number of eutectic cells, promoting graphitization, and improving the matrix structure. As shown in the figure, an inoculant adding device 7 was disposed above the chute 5.

As shown in FIG. 3, this inoculant addition device 7 is constructed by fixing a dispensing regulating cylinder g having a cylindrical hole with a predetermined inner diameter d to the lower end of an inoculant discharging hopper 8, and the cylindrical hole serves as a dispensing opening. It is 10.

11 is an opening/closing gate that opens and closes the droplet 10.

By inoculating with the inoculant addition device 7, a predetermined amount of inoculant corresponding to the diameter d of the injection port 10 can be uniformly introduced into the molten metal, and if the amount of poured metal per hour changes, it is possible to The necessary amount of inoculation can be performed by replacing the injection regulating cylinder 9 with a injection regulating cylinder 9 having a injection opening 10 having a diameter d.

However, when casting a cast iron pipe 1 having a socket part 1a as shown in FIG. 1, since the wall thickness T of the socket part 1a is thicker than the wall thickness t of the main body part 1b, It is necessary to increase the amount of inoculation per unit weight of the molten metal supplied to the socket 1a.

For example, when the wall thickness is 10 mm, the appropriate inoculation rate is O. OS
-0.10%, whereas the appropriate inoculation rate when the wall thickness is 20 mm is 0.12-0.15%.

In this regard, the conventional inoculant addition device 7 can only maintain a constant amount of inoculation per unit weight of molten metal, and therefore the inoculation effect to the socket part 1a is not sufficient, and the base structure is different from that of the main body part 1b. There was a problem that post-treatments such as heat treatment were not constant.

Therefore, as shown in Fig. 2, worker M carried out additional inoculation on the molten metal supplied to the socket 1a, but the timing and addition rate of addition were inconsistent, and moreover, it required manual effort. There was a problem that it was necessary.

The purpose of the present invention is to provide an inoculant addition device that can solve these problems.
By arranging an auxiliary hopper that communicates with the dropping port and has a discharge port with a larger diameter than the dropping port, an inoculant is added from the auxiliary hopper to the molten metal that is first supplied to the thick wall part, Next, the inoculant is added to the molten metal supplied to the thick wall part, which accounts for the majority, through the auxiliary hopper that has been emptied from the inoculant drop hopper, so that more inoculant is added to the thick wall part. The present invention provides an inoculant addition device that has the following features.

In a preferred embodiment, the auxiliary hopper is arranged in multiple stages in the circumferential direction of a rotating body that is rotatable around an axis that is spaced apart from the axis of the dropping port, and the auxiliary hopper has a capacity and a discharge opening that are at least equal to each other. One of them is made to be different from the other, and by switching the auxiliary hopper with the rotation of the rotating body, it is possible to deal with any wall thickness and size of the thick part.

An embodiment of the present invention will be described below with reference to FIG.

Components that are substantially the same as those of the conventional example explained in FIG. 3 are given the same reference numerals, and the description thereof will be omitted.

A rotary plate 13 that is slidable on the lower end of the inoculant dropping hopper 8 and is rotatable around an axis 12 spaced apart from the axis of the dropping port 9 is disposed at a plurality of locations in the circumferential direction on the lower surface of the rotary plate 13. Auxiliary hoppers 14a, 14b, 14C, 14d
is installed.

Each of the auxiliary hoppers 14a to 14d can be selectively communicated with the dropping port 9 by rotating the rotary plate 13.

The auxiliary hoppers 14a to 14d are different from each other in at least one of their capacities and the diameters of the discharge ports 15a to 15d, and the diameters Di of the discharge ports 15a to 15d are different from each other.
D2゜D3. D4 is larger than the diameter d of the drop port 10.

That is, d<DI, D2. D3. D4 big,,%
'It is composed of D2, D3, and D4.

Reference numeral 16 indicates an operating lever for the opening/closing gate 11.

In the above configuration, the rotary plate 13 is rotated to position, for example, the auxiliary hopper 14 a below the inoculum drop hopper 8 , and the inoculum is placed in the inoculum drop hopper 8 with the outlet 15 a closed by the opening/closing damper 11 . The inoculant is stored in the +1 auxiliary hopper 14a via the inoculum dropping hopper 8 and the dropping port 10.

When casting is started from this state, the operation lever 16 opens the laparotomy gate 11.

Then, initially, the inoculant in the auxiliary hopper 14a is added to the molten metal supplied from the large-diameter outlet D1 to the thick-walled parts such as the socket a, and the dropping of the inoculant in the tilting hopper 14a is completed. Then, the inoculant in the inoculum dropping hopper 8 is dropped.
10 into the auxiliary hopper 14a and toward the discharge port 15a, and is added to the molten metal supplied to the normal thick parts of the main body part 1b and the like.

That is, the capacity of the auxiliary hollow /<14a is selected to be large enough to correspond to the amount of molten metal supplied to the thick portion.

Although the above embodiments have been described with reference to centrifugal casting of cast iron pipes, it is clear that the present invention can also be applied to pouring into general molds.

According to the inoculant addition device of the present invention, as will be clear from the following explanation, an auxiliary hopper is provided below the inoculum dropping hopper, and has an outlet that communicates with the dropping port and has a larger diameter than the dropping opening. Because of this arrangement, the amount of inoculant added per unit time can be changed during addition, and appropriate inoculation can be performed in response to changes in the thickness of the casting.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a cast pipe as an example of a casting object, Fig. 2 is a front view of a centrifugal casting device for cast iron pipes, Fig. 3 is a longitudinal cross-sectional view of a conventional inoculant addition device, and Fig. 4 is a longitudinal cross-sectional view of a conventional inoculant addition device. FIG. 1 is a front view showing an embodiment of the inoculant addition device according to the present invention. 7... Inoculant addition device, 8... Inoculant dropping hopper, 9... Dropping regulating cylinder, 10...
...Drop opening, 11... Opening/closing damper, 13...
... Rotating plate (rotating body), 14 a , 14 b ,
14C. 14 d----Auxiliary hopper, 15 a, 15
b, 15 C, 15d...Discharge port.

Claims (1)

[Scope of utility model registration request] 1. An inoculant addition device characterized in that an auxiliary hopper is disposed below the inoculum dropping hopper and has an outlet communicating with the inoculum dropping opening and having a larger diameter than the dropping opening. 2. A plurality of the auxiliary hoppers are arranged in a circumferential direction of a rotating body rotatable around an axis distant from the axis of the drop opening,
The inoculant addition device according to item 1 of the patent scope, wherein the inoculant addition device is different from each other in at least one of capacity and discharge port diameter.