JPH0219171B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a temperature measurement/sampling device in a vacuum refining furnace, and relates to a vacuum seal surrounding the support rod of the temperature measurement/sampling probe due to its high temperature or adhered metal. To provide a device that does not damage the gasket, and a device that does not damage the gasket and that can measure temperature without returning the pressure inside the tank to the atmosphere.
The purpose of the present invention is to provide a temperature measurement/sampling device that can perform sampling. Note that the temperature measurement/sampling device of the present invention can be used in any case where only temperature measurement is performed, only sampling is performed, or both temperature measurement and sampling are performed. In vacuum refining furnaces for molten metal, such as vacuum degassing and vacuum refining, it is necessary to measure temperature and sample in order to analyze the molten metal. To do this, it is necessary to take the sample out of the vacuum chamber, and with conventional equipment, temperature measurement and
In order for the sampling probe 2 and the probe support rod 4 to pass through the sealing part 3, the probe 2
Also, the gasket 9 provided in the seal portion 3 is damaged due to the high heat in the portion of the support rod 4 near the probe and the metal 5 attached to the support rod 4 of the probe, and if the damaged gasket is left as it is, the vacuum chamber 1 There was a problem in that the gasket had to be replaced frequently because it became difficult to maintain the degree of vacuum. The device of the present invention solves the above-mentioned problems of the conventional device, and the sampling probe is inserted through an opening provided in a part of the vacuum chamber, and the molten metal located inside the vacuum chamber is In an apparatus for measuring and sampling the temperature of metal, a shutoff valve is installed above the opening of the vacuum chamber and has a valve body inside the valve body, and the valve body is rotated by an actuator. The support rod of the probe is slidably provided on a detachable seal cover that is airtightly disposed on the shutoff valve, and is engaged with the seal cover by a locking portion provided on the support rod. This is a temperature measurement/sampling device for vacuum refining furnaces. Embodiments of the apparatus of the present invention will be described below with reference to the drawings. In FIGS. 3 and 4, an opening 8 for temperature measurement and sampling is provided in the upper part 7 of the vacuum chamber 1 housing the molten metal 6. A temperature measurement/sampling probe 2 and a probe support rod 4 are inserted into the vacuum chamber 1 through the opening. A seal cover 10 that airtightly surrounds the support rod 4 of the probe and houses a gland gasket 9 that allows the support rod 4 to slide has a gland gasket holder 11 and a gland gasket presser 1 on the top.
2 and a connecting flange 13 at the bottom. Reference numeral 15 denotes a telescopic tube, which is installed in the middle of the seal cover 10 as required. The probe support rod 4 is raised and lowered by a drive motor 18 via a chain 16 and a sprocket 17. Also, the probe support rod 4 has a locking portion 19.
is provided, and the locking portion 19 locks with a part of the seal cover 10 when the probe support rod 4 rises. A shutoff valve 20 such as a ball valve is installed between the opening 8 of the vacuum chamber 1 and the seal cover 10 .
The shutoff valve 20 has a ball valve body 2 inside the ball valve body 21.
2 is installed, and a shaft 23 connected to the ball valve main body 21 is rotationally driven by an actuator such as a cylinder 24, and the ball valve body 22 is rotated 90 degrees to open and close the valve. Vacuum sealing between the ball valve body 21 and the ball valve body 22 is performed by the seat portion 25. Although the embodiments shown in FIGS. 3 and 4 use a ball valve as the shutoff valve, a valve such as a butterfly valve may also be used. 26 and 27 are exhaust pipes that open into the ball valve body 22 in order to bring the space surrounded by the shutoff valve 20 and the seal cover 10 to vacuum pressure or atmospheric pressure when the shutoff valve 20 is in the closed state; Repressure pipes 26 and 27 are connected to a vacuum evacuation device (not shown) and a return pressure air source, respectively, and valves 28 and 29 are installed in the middle thereof, respectively. Furthermore, the connection flange 13 at the bottom of the seal cover 10
is airtightly disposed on the opening flange 14 of the shutoff valve 20 , and the seal cover 10 is attached to the ball valve body 2.
1 can be attached and detached. The procedure for temperature measurement and sampling during vacuum processing in the apparatus shown in FIGS. 3 and 4 is as shown below. In the state shown in FIG. 4, the exhaust pipe valve 28 and the shutoff valve 20 are closed, and the seal cover 10 is located above and separated from the ball valve body 21 provided to cover the vacuum chamber opening, and the probe 2 is attached. The probe 2 is attached to the probe support rod 4 while the probe support rod 4 is raised to a position where it is easy to move. At this time, the seal cover 10 is supported by engaging with a locking portion 19 provided on the probe support rod 4. Next, the support rod 4 of the probe and the seal cover 10 are lowered together, and the connecting flange 13 of the seal cover 10 is placed on the flange 14 of the ball valve body 21, or the flange 13 is attached to the flange 14 using a flange fixing device. After closing the valve 29 of the return pressure pipe in the fixed state (the crimping device is not shown), the valve 28 of the exhaust pipe is opened, and the space surrounded by the seal cover 10 and the shutoff valve 20 is inside the vacuum chamber 1. Similarly, after creating a vacuum state, the shutoff valve 20 is opened. Thereafter, the probe support rod 4 is lowered while sliding against the gland packing 9, and the probe 2 is immersed in the molten metal 6 for a certain period of time. After that, probe 2 is raised. The support rod 4 of the probe rises while sliding inside the gland packing 9, and the shutoff valve 20 and the valve 28 of the exhaust pipe are closed until the locking part 19 of the support rod locks with the seal cover 10 . Then, the valve 29 of the pressure recovery pipe is opened to return the space to atmospheric pressure, and then, if a flange fixing device is installed, the fixation is released. After the locking portion 19 of the probe support rod 4 locks on the seal cover 10 , the probe support rod 4 and the seal cover 10 are moved together into the fourth position.
It is raised to the work starting position shown in the figure. Then, remove probe 2. Although the exhaust pipe 26 and the recovery pipe 27 are installed in the device of this embodiment, these are not essential. When the shutoff valve 20 is closed, the vacuum chamber 1
Since the pressure inside the ball valve body 21 is lower than the pressure inside the ball valve body 21, when the shutoff valve 20 is opened, the pressure in the ball valve body 21 without the exhaust pipe 26 is large compared to the case where the inside of the ball valve body 21 is exhausted as in this embodiment. Although it requires a lot of force, it is sufficient to increase the driving force of the cylinder 24 of the shutoff valve 20 , and also, although the air inside the ball valve body 21 would flow into the vacuum chamber 1 without the exhaust pipe 26, it is necessary to increase the driving force of the cylinder 24 of the shutoff valve 20. There is no major effect except in the case of smelting that requires . Also, the pressure recovery pipe 2
7 is not installed, when the probe support rod 4 is pulled up and the seal cover 10 is raised together with the probe support rod 4 in the state shown in FIG . A larger pulling force is required than when the space surrounded by the seal cover 10 and the seal cover 10 is returned to atmospheric pressure, but even in this case, a pulling motor 18 with a large driving force may be used. Therefore, even if the exhaust pipe 26 and the recovery pipe 27 are not present, the features of the present invention are not lost in any way. According to the present invention, the seal cover 10 is attached to the vacuum chamber 1.
Alternatively, it is detachable from the ball valve main body 21 and has a structure that allows the seal cover 10 to be raised together with the probe support rod 4, so that the probe 2 or the probe that is heated to high temperature can be easily attached to the ball valve body 21, unlike conventional devices. There is an advantage that the tip of the second support rod 4 does not pass through the gland packing 9, so that the gland packing is not damaged by heat and vacuum sealing can be performed reliably. In addition, temperature measurement and sampling can be performed while maintaining the degree of vacuum in the vacuum chamber 1, and therefore, compared to conventional equipment, time such as pressure recovery time can be saved.
The processing time is short, and the power and utilities required for vacuum evacuation and atmospheric pressure restoration are not required. It has the advantage that temperature measurement and sampling can be carried out several times depending on each refining stage, such as the final stage.

[Brief explanation of drawings]

1 and 2 show a conventional device, with FIG. 1 being an explanatory diagram during temperature measurement and sampling, and FIG. 2 being an explanatory diagram of the state before or after temperature measurement and sampling. Figures 3 and 4 show an embodiment of the device of the present invention, Figure 3 is an explanatory diagram during temperature measurement/sampling, and Figure 4 is an explanatory diagram of the state before or after temperature measurement/sampling. . 1...Vacuum chamber, 2...Probe, 4...Support rod, 6...
Molten metal, 8... Opening, 9... Seal packing, 1
0... Seal cover, 19... Locking part, 20... Shutoff valve, 21... Ball valve body, 22... Ball valve body, 2
3...Shaft, 24...Cylinder, 25...Seat part, 2
6...Exhaust pipe, 27...Recovery pipe, 28...Exhaust valve, 2
9...Repressure valve.

Claims (1)

[Scope of Claims] 1. In an apparatus for measuring and sampling the temperature of molten metal located inside a vacuum chamber by inserting a sampling probe through an opening provided in a part of the vacuum chamber, A valve body is provided within the valve body over the opening,
A cutoff valve configured to rotate the valve body with an actuator is installed, and a support rod of the probe is slidably provided on a removable seal cover airtightly disposed on the cutoff valve. 1. A temperature measurement/sampling device for a vacuum refining furnace, characterized in that a locking portion provided on a support rod engages with a seal cover.