JPS6241829B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an additive supply device.

For example, in centrifugal casting, it is common practice to add an inoculant to the molten metal during pouring, and among these, some inoculants should especially be added immediately before pouring into the rotary mold. As an additive supply device for performing such addition, a supply pipe is installed along the injection gutter of the centrifugal casting machine, one end of the supply pipe is opened near the discharge end of the injection gutter, and gas is supplied to the other end. It has been proposed that a pressure feeding section is provided and an additive dropping device for dropping the additive into the gas pumping section. By the way, if the supply of this additive is interrupted for some reason during the process, a defect will occur in the cast product, but if this interruption in supply cannot be reliably detected, a defective cast product will be cast. become. Therefore, in order to constantly monitor whether additives are being added or not, it is most reliable to install a detection device at one end of the supply pipe, but this position is exposed to high temperatures and cannot be installed. Conventionally, there has been no device capable of detecting whether or not the supply of additives is being reliably carried out without interruption.

In view of these problems, the present invention provides an additive supply device that can detect the additive at a position remote from the additive supply end and can always detect whether or not the additive is finally added to the molten metal. An embodiment thereof will be described below based on the drawings.

In FIG. 1, 1 is a rotary mold, and 2 is a pouring gutter that is inserted into the rotary mold 1 and injects molten metal into the inner surface of the rotary mold 1. One end on the rotary mold side is formed as a discharge end 2a, and the other The end is connected to chute 3. 4 is a pouring ladle that supplies molten metal at a predetermined flow rate onto the chute 3 during casting. Reference numeral 5 denotes an additive supply device, which includes a supply pipe 6 that extends along the pouring gutter 2 and has one end 6a opened near the discharge end of the pouring gutter 2, and a gas pumping section 7 at the other end of the feed pipe 6. and an additive dropping device 8 that drops additives to the gas pumping section 7. The gas pumping section 7 consists of a gas injection nozzle 9 that injects pressurized gas toward one end of the supply pipe, and a supply port 10 that supplies the additive into the supply pipe 6 at a position near the gas injection nozzle 9. 10
The additive supplied from the supply pipe 6 is transported by the gas flow flowing toward the opening 6a at one end of the supply pipe 6, and is ejected from the opening 6a at one end. The additive dropping device 8 has a lower end chute portion 11 connected to the supply port 10.
a storage case 12 connected to the storage case 1;
2, a hopper 13 which is disposed and supported through a measuring device (not shown) and whose lower end discharge port 13a is located above the chute portion 11; and an opening/closing damper 14 whose opening of the discharge port 13a is adjusted by an air cylinder 14a.
An optical flow rate detection device 15 is disposed between the discharge port 13a and the chute portion 11. The discharge port 13a and its opening/closing damper 14
is configured to drop the additive in a band shape, and the light projecting device 16 of the optical flow rate detection device 15
is configured to project a band-shaped light beam that intersects this additive band toward the light-receiving device 17.
The light receiving device 17 receives the light beam that has passed through the additive band and detects the amount of the received light as an electric signal or the like, and the output signal is inputted to the processing device 18. This processing device 18 includes an integrator that integrates the output from the light receiving device 17 in the width direction of the additive band;
The apparatus includes an arithmetic unit that calculates the flow rate of the additive from the relationship between the output of the integrator and the amount of the additive dispensed per unit time, which has been calculated in advance. Reference numeral 19 denotes a load cell of the weighing device, and its output is inputted to a weight measuring device 20, which is configured to measure fluctuations in the weight of the entire hopper 13, that is, the total amount of additive added. 21 is an infrared thermometer that detects the start of pouring from the pouring ladle 4, inputs the signal to the controller 22 of the air cylinder 14a of the opening/closing damper 14, and supplies additives at the same time as the start of pouring. It is composed of 23 is a gas pressure detection device that detects the pressure in the supply pipe 6 in order to detect a blockage in the supply pipe 6 or a decrease in the supply amount of pressurized gas, and its output is sent to the alarm device 24 or the control device for the pressure gas supply source. etc. are input.

Next, the operation will be explained. As shown in FIG. 2, when the pouring ladle 4 is tilted by the start signal and pouring starts, this is detected by the infrared thermometer 21.
The opening/closing damper 14 is opened by the signal, and the additive is dropped from the discharge port 13a to the supply port 10, and the flow rate detection device 1 detects that the additive has started to be dropped.
Detected at 5. The additive dropped into the supply port 10 is ejected from the gas pressure feeding section 7 through the supply pipe 6 through the opening 6a at one end thereof, and is discharged from the pouring ladle 4 through the chute 3 from the discharge end 2a of the pouring gutter 2. It is added to the molten metal. The condition of the additive being dropped into the supply port 10, that is, the flow rate of the additive is measured by the flow rate detection device 15 and its processing device 18, and it is checked whether the flow rate is within the normal range or not, and if it is out of the range. When it appears, it will be displayed to indicate that it is an abnormal situation. Also, even if the flow rate is normal, the supply pipe 6
If the additive is clogged or does not flow smoothly within the supply pipe 6, addition will not be carried out normally. However, if the additive is clogged, the pressure inside the supply pipe 6 will rise abnormally and the flow rate of the pressure gas will decrease. If the additive is not transferred or the amount of additive is small, the pressure will drop, so the gas pressure detection device 23 detects this and the alarm device 24 detects that there is an abnormal situation.
Or it is controlled to increase the flow rate of pressurized gas. Thus, by combining the flow rate detection device 15 and the gas pressure detection device 23, it is possible to check whether the additive was finally added at a normal additive flow rate. In this way, while pouring the molten metal from the pouring gutter 2, a predetermined amount of additives are added to the molten metal, and casting is performed in the rotary mold 1. When a predetermined amount of molten metal is poured, the molten metal pouring ladle 4 moves back to complete the pouring, and the infrared thermometer 21 detects this, and the opening/closing damper 14 is closed. After that, load cell 19
The total amount of additives added in one casting is measured by the weight measuring device 20 based on the signal from the weighing machine 20, and it is checked whether it is within a predetermined range.If it is outside the range, an abnormal state is displayed. do. If there is an abnormality in any of the above measurements, markings are applied to the cast tube at that time, and after further inspection, the defective product is disposed of.

In addition, although the above example shows an example in which additives are added at the discharge end of the injection gutter in a centrifugal casting machine, it is also possible to add additives at the chute section or in various molten metal processing equipment other than centrifugal casting. It is also applicable to

According to the additive supply device of the present invention, as is clear from the above description, the additive can be added between the additive dropping device and the gas pumping section at the other end of the supply pipe without directly measuring the additive at the supply end. By detecting the flow rate of the additive and the gas pressure inside the supply pipe, it is possible to confirm whether the additive has been added normally from the supply end, and to check for product defects in advance. can do.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a general schematic diagram and FIG. 2 being a flowchart of the operation. DESCRIPTION OF SYMBOLS 1... Rotating mold, 2... Pouring gutter, 2a... Discharge end, 5... Additive supply device, 6... Supply pipe, 6a
... One end opening, 7 ... Gas pressure feeding section, 8 ... Additive dropping device, 9 ... Gas injection nozzle, 10 ... Supply port, 11 ... Chute section, 13 ... Hopper, 1
3a...Lower end discharge port, 14...Opening/closing damper, 1
5...Flow rate detection device, 16...Light projection device, 17...
...Light receiving device, 18... Processing device, 19... Load cell, 20... Weight measuring device, 23... Gas pressure detection device.

Claims (1)

[Claims] 1. At the other end of the supply pipe with one end open, a gas pressure feeding section capable of supplying pressure gas into the supply pipe is provided,
An additive dropping device for dropping and supplying the additive toward the gas pumping section is provided, a flow rate detection device for the dropping additive is provided between the additive dropping device and the gas pumping section, and a flow rate detection device for the dropping additive is provided in the supply pipe. An additive supply device characterized by being provided with a gas pressure detection device capable of detecting the pressure of a pumping gas in a supply pipe.