JPH03220440A - Vibrating viscosimeter - Google Patents

Abstract

PURPOSE:To improve the heat retaining properties, measuring accuracy of viscosity and operating economy of a heating furnace by fitting a plug having a loose fitting hole for a vibrating piece into an insertion port of a sample container of the heating furnace, and providing the loose fitting hole with a furnace lid. CONSTITUTION:A though-hole 22 is formed in an up-and-down direction of a main body 21 of an electric furnace. A core pipe 23 is fitted in the hole 22. Moreover, a plug 26 is detachably fitted in the hole 22. The plug 26 has a square hole 26a allowing a vibrating piece 3 to pass therethrough at the center in a diametrical direction from an upper opening of the pipe 23. The upper opening of the plug 26 is closed by a furnace lid 27 which is freely opened. Even when the lid 27 is closed, there are secured a loose fitting hole into which a vibrating rod 4 is loosely fitted, and an insertion hole for inserting a protecting pipe having a wire of a thermocouple inserted. Therefore, while the temperature of a melt 1 in a crucible 2 is measured, the radiation from the melt 1 can be shut off by the plug 26 and lid 27, with improving the heat retaining properties. As a result, the temperature distribution of the melt 1 can be maintained good, so that the measuring accuracy of viscosity is improved. In addition, the power consumption is saved.

Description

Detailed Description of the Invention 3. Fields of Industrial Application] The present invention is particularly directed to a vibrating viscometer that is capable of equalizing the temperature when measuring the viscosity of a molten liquid to be measured. Regarding.

[Conventional technology]

Generally, in a vibrating viscometer, a vibrating piece installed at the lower end of a vibrating rod is immersed in the fluid to be measured contained in a sample container, and the vibrating piece is passed through the vibrating rod to produce a predetermined vibration amplitude in the resonance region of the excitation device. While detecting the amplitude of the vibrating element that is attenuated by the viscous resistance of the fluid to be measured, the amplitude value of the detected vibration is applied to a fluid with a standard viscous resistance, such as a standard viscosity liquid. The viscosity of the fluid to be measured is determined by comparing the vibration-damped amplitude value of the vibrating piece which is immersed in the liquid and thereby damped.

By the way, in the steel manufacturing industry, for example, there is a method of measuring the viscosity of high-temperature molten slag as a means of examining the slag dischargeability (fluidity) of hot metal. In that case, it is essential to maintain the temperature of the molten slag within a predetermined temperature range throughout the viscosity measurement in order to obtain highly accurate viscosity measurements.

An example of a device that maintains the temperature of the molten liquid of the object to be measured for viscosity within a predetermined temperature range and obtains a continuous
A vibratory viscometer of the type disclosed in Japanese Patent No. 135261 tlif4 is known.

Hereinafter, this will be introduced while referring to the schematic side cross-sectional configuration explanatory diagram No. 6 and the ■-■ cotton cross-sectional diagram No. 7 of FIG. A plurality of main heaters (52) are installed in parallel along the inner wall of the
The heating furnace main body has a plurality of auxiliary heaters (53) arranged horizontally in parallel along the ceiling wall of the storage chamber. A crucible (54) containing an object to be measured for viscosity is housed in the housing chamber of the heating furnace main body (51), while the viscosity is measured from the upper opening (55) of the heating furnace main body (51). A vibrating piece supported by the container (56) is loosely fitted.

The details of the above-mentioned viscosity measuring device (56) include a vibrator a (5D) as a vibrating means provided directly above the upper opening (55), and a central position of the lower part of this vibrator a (57). A vibrating rod (58) extending to the storage chamber of the heating furnace body (51) is installed vertically, and a vibrating piece (59) is fixed to the lower end of the vibrating rod (58). ) is fixed to the base end side of the vibrating rod (58) in a state perpendicular to the longitudinal axis of the vibrating rod (58). A displacement meter (60) for measuring the amplitude of vibration of this disk (60) is located between
61) are arranged.

The manner in which the vibratory viscometer having the above configuration is used will be explained below. The object to be measured for viscosity placed in the crucible (54) is heated and /8, and when it is confirmed by the thermometer that the temperature of this melt (62) has reached a predetermined temperature, the excitation source (57) generates a sine wave with a predetermined amplitude via the vibrating rod (58). The vibrating piece (59) excited by wave vibration melts t1. (62). This allows the vibrating piece (5
9) is attenuated, and this attenuation causes displacement meter (61)
The viscosity of the melt (62) is measured, but the most important thing in such viscosity measurement is that the viscosity of the melt (62) is detected throughout the viscosity measurement as described above.
2) is to continue to maintain the temperature within a predetermined temperature range. Therefore, in this case, the power input to the auxiliary heater (53) is controlled by the control unit (not shown) at tIUL of /8 f/1.
(62) is maintained within a predetermined range.

[Problems to be Solved by the Invention] Although the vibratory viscometer having the above configuration is useful, it still has problems as described below from the economical point of view regarding temperature control.

In other words, since the power supplied to the auxiliary heater must be controlled so that the detected temperature of the auxiliary heater matches the detected temperature of the heating furnace, not only is a power meter for temperature control required. However, the heating furnace itself becomes expensive, which is not economically desirable.

Therefore, an object of the present invention is to provide a vibratory viscometer that is economical and equipped with a heating furnace that has high heat retention.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned problems, and therefore, the configuration of the vibratory viscometer according to the present invention is as follows:
The viscosity measuring device includes a sample container housed in a heating furnace, and a viscosity measuring device for measuring the molten sample in the sample container, and the viscosity measuring device includes a vibrating piece that measures the free end of a vibrating rod that is vibrated by a vibrating means. and configured to measure the viscosity of the sample by attenuation of the amplitude when the vibrating bar is immersed in the sample in the container, and the vibrating rod and the heating furnace are arranged so as to be relatively movable. The vibratory viscometer is a vibrating viscometer, in which a plug having a loose fitting hole for a vibrating piece is fitted into the insertion opening of the sample container of the heating furnace, and a through hole through which a vibrating rod can pass through the loose fitting hole. It is characterized by being provided with a furnace lid each having a thermometer insertion hole.

[Function] According to the vibratory viscometer of the present invention, a plug having a loose fitting hole through which a vibrating piece can pass is fitted into the insertion opening of a sample container of a heating furnace, and a vibrating rod is further fitted into the loose fitting hole. Since the furnace lid is provided, each having a through hole and a thermometer insertion hole through which the temperature can be passed, the plug and the furnace lid can shield radiant heat from the melt during temperature measurement of the melt.

〔Example〕

Embodiments of the present invention are shown in FIG. 1, which is a partially cross-sectional front view of a vibratory viscometer, and FIG. 2, which is a side sectional view of a heating furnace containing a crucible. Figure 3 is a line cross-sectional view,
The explanation will be given with reference to FIG. 4, which is a view in the direction of arrow 2 in FIG. 2, and FIG. 5, which shows the temperature distribution measurement position at each depth position of the melt.

First, let me explain the configuration of the vibratory viscometer body (b).
This vibratory viscometer main body h) has the same structure as that described in Japanese Patent Application No. 1-164874 filed by the present applicant,
As shown in Fig. 1, reference numeral (1) indicates the melt of the object whose viscosity is to be measured in a crucible (2) serving as a sample container. Provided vibrating piece (3)
is immersed. This vibrating piece (4) is
It consists of i' (4a) and an upper vibrating piece (4b), which are straightly joined by a joint (5).

This is done so that the damaged vibrating element (3) can be easily replaced with another new vibrating element. Furthermore, the upper vibrating piece (4b) is composed of a connected body of two vibrating pieces.

In detail, the outer edge of the plate is supported on the upper part of the storage case (8). The protruding outer edge (9a) of the spring support (9) has a protruding outer edge (9a) whose outer edge protrudes downward at the lower end of the vibrating piece (4c).
A second upper vibrating piece (4d) whose one end is fixed to the center of the lower surface of the intermediate plate spring 00) whose outer edge is fixed to 9a)
The second upper vibrating piece (4d) is provided with a brim-shaped reference plate (6). The displacement of the reference plate (6) due to vibration is inputted to the arithmetic circuit 04) via a displacement detection sensor and a displacement converter aω.

Note that the device connected to the vibration device (11) by wiring is the vibration coil (l) installed inside the vibration device (01).
1a) and 0 oscillators and 0 ω amplifiers.

The crucible (2) is housed in an electric furnace Ql having the configuration shown in FIG. 2, which will be described below.

The details of this electric furnace QΦ will be explained below with reference numeral (21
) is an electric furnace main body having a through hole (22) in the vertical direction, and a furnace core tube (23) which becomes a refractory is installed in this through hole (22).
) is fitted, and a coil-shaped heater (24) is fitted between the inner wall of the through hole (22) and the outer periphery of the furnace core tube (23), surrounding the outer periphery of the furnace core tube (23). It is buried. Then, a columnar crucible holder (25) that becomes a refractory is inserted into the lower side of the furnace core tube (23), and the crucible (2) is placed on top of this, and the upper opening of the furnace core tube (23) A rectangular hole (26a) with a rectangular cross section with an inner dimension through which the vibrating element (3) can pass is provided in the radial center thereof, and a hole (26a) is provided on each of the opposing inner walls near the upper opening for insertion and removal. A refractory plug (26) with an insertion/removal recess (26b) for the tip of the insertion/removal tool to catch on.
are removably fitted.

Further, the upper opening of this plug (26) is covered by a furnace M (27) which can be opened and closed.

As can be well understood from FIG. 3, the furnace lid (27) has a two-part structure, each of which is supported by a fulcrum Φ) so as to be openable and closable in the horizontal direction. It has a loose fitting hole (27a) with an inner diameter into which the vibrating piece (4) can be loosely fitted, and this loose fitting hole (27a)
The structure includes an insertion hole (27b) for inserting a protective tube made of refractory material into which a wire of a thermocouple is inserted at a position removed from the housing.

Therefore, when power is applied to the heater (24), the object to be measured for viscosity in the crucible (2) is heated and melted, and ? It becomes 8 ounces liquid (1). Next, the furnace M (27) is opened, and the vibrating device (11) vibrates the vibrating piece (3) through the vibrating piece (4).
) is vibrated sinusoidally at a predetermined frequency, the vibrating piece (3) is immersed in the melt 1) to a predetermined depth, and the furnace lid (27) is closed. The vibrating piece (
The attenuation of the amplitude of the vibration in step 3) is detected by the displacement detection sensor (+2) via the reference plate (6), and compared with the attenuation of the amplitude due to immersion of the vibrating piece (3) in the standard solution. The viscosity of (1) will be determined.

By the way, as described above in measuring the viscosity of the melt (+), a highly accurate viscosity cannot be obtained unless the temperature of the melt (1) is as uniform as possible.

Therefore, as shown in Fig. 5, the temperature at each depth of nine points (■ to ■) at 5 mm intervals from the liquid surface of the melt (1) was determined for two cases, with and without the plug (26). Platinum-platinum rhodium thermocouples are inserted into the insertion holes (27b) at respective depths, and the molten liquid (1)
The temperature was measured.

The results are shown in Table 1.

Note that measurement points (1) to (2) in the table correspond to positions (5) to (2), respectively, every 5 points in the depth direction from the surface of the melt (1) shown in FIG.

Table 1, Temperature at each depth position (unit: °C) As is well understood from Table 1 above, not only the temperature difference in the depth direction of the melt (+1) is small, but also the electric furnace QΦ Even if the set temperature is low, it is possible to maintain the temperature of the melt (1) at the same temperature.

In other words, in this case, the set temperature difference due to electric furnace QO is 7
Although the temperature is 0°C, the temperature of the melt (1) can be maintained at the same temperature, and the electric furnace Q can be used for viscosity measurement work.
It also has the effect of reducing @'s power consumption.

Saramuko does not require a controller to control the power input to the auxiliary heater of the electric furnace, unlike the conventional vibrating viscometer, and the plug (26) is fitted into the crucible insertion port of the electric furnace QO. Therefore, the viscosity of the melt (1) can be measured with high accuracy simply by improving its heat retention performance.

Furthermore, it will be easily understood that this technical idea can also be applied to conventional viscosity measuring instruments.

It should be noted that the embodiments described above are merely examples of the present invention, and therefore the scope of the technical idea of the present invention is not limited by these embodiments.

〔Effect of the invention〕

As described in detail above, according to the vibratory viscometer according to the present invention, a plug having a loose fitting hole through which a vibrating piece can pass is fitted into the insertion opening of a sample container of a heating furnace, and the plug has a loose fitting hole through which a vibrating piece can pass. Since the furnace lid is provided with a through hole through which the vibrating rod can pass and a thermometer insertion hole, the plug and the furnace lid can shield the radiant heat from the molten liquid while measuring the temperature of the molten liquid. As a result of the improved performance, it is now possible to maintain a good temperature distribution of the melt without using an auxiliary heater like in the heating furnace of a conventional vibrating viscometer, which not only improves the accuracy of measuring the viscosity of the melt, but also The improved heat retention effect also results in a reduction in power consumption, which has an extremely significant effect on improving the accuracy of viscosity measurement and the economical efficiency of its operation.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, and FIG. 1 is a partial cross-sectional front view of a vibratory viscometer, and FIG.
The figure is a side sectional view of the heating furnace containing the crucible, and Figure 3 is the second
Figure ll-1 [1-line sectional view, Figure 4 is a circle viewed from the ■ arrow in Figure 2, Figure 5 is an explanatory diagram of the temperature distribution measurement position at each depth position of the melt, Figures 6 and 7 6 shows a conventional example, FIG. 6 is a schematic side sectional view of the vibratory viscometer, and FIG. 7 is a sectional view taken along line 1 to 1 of FIG. 6. (1)... Molten liquid, (2)... Crucible, (3)...
Vibrating piece, (4)... Vibrating rod, (6)... Reference plate, (
8)... Storage case, (9)... Hanging support, 00
)...Intermediate plate spring, (11)...Vibration device, zero...
...Displacement detection sensor, Qal...Electric furnace, (21)
...Electric furnace body, (22)...Through hole, (23)...
・Furnace core tube, (24)...heater, (25)...
Crucible holder, (26)...Plug, (26a)...Square hole, (26b)...Recess for insertion/removal, (27)...Furnace lid, (27a)...Free fit Hole, (27b)...insertion hole,
(pl... fulcrum.

Claims (1)

[Claims] (1) Comprising a sample container housed in a heating furnace and a viscosity measuring device for the molten sample in the sample container, the viscosity measuring device is capable of measuring the free end of a vibrating rod that is vibrated by a vibrating means. A vibrating rod is provided, and the vibrating rod is configured to measure the viscosity of the sample by attenuating the amplitude when the vibrating rod is immersed in the sample in the container, and the vibrating rod and the heating furnace are moved relative to each other. A vibratory viscometer arranged so that a plug having a loose fitting hole for a vibrating piece is fitted into an insertion opening of a sample container of the heating furnace,
A vibratory viscometer characterized in that the loose fitting hole is further provided with a furnace lid having a through hole through which a vibrating rod can pass and a thermometer insertion hole.