JP2649814B2 - Differential thermobalance - Google Patents

Description

The present invention relates to a differential thermobalance used for a thermogravimetric analyzer or the like.

In such an apparatus, it is necessary to insert the sample and the standard sample into the same furnace, and to arrange them as close as possible so as not to cause a temperature difference. Further, for example, when the sample is melted, the position of the center of gravity changes due to the temperature change. Therefore, in order to prevent the zero point fluctuation of the balance due to the movement of the sample, it is necessary to use a Roberval mechanism. Therefore, conventionally, as shown in FIG. 1, two horizontal arms 1 and 2 and 3 and 4 are respectively arranged in a vertical plane, and the same end is rotatably connected to a fixed portion. A balance in which one end of each of the two arms is rotatably connected to a vertical bar 5 or 6 to form two sets of links, and the bars 5 and 6 are supported by a fulcrum 7. A device is used which is suspended at both ends of the arm 8 and supports the handles of the holders 9 and 10 of the sample or the standard sample with the rods 5 and 6 described above.
In such an apparatus, since the working points of the sample and the balance are both included in the link surface, the link operates smoothly without the risk of applying a torsional force having a horizontal component to the link. However, when the sample holder 9.10 is inserted into the same furnace and brought as close as possible to prevent the temperature difference between the sample and the standard sample, the sensitivity of the balance arm 8 becomes extremely short because the balance arm 8 becomes extremely short. Has a drawback of being significantly reduced.
Accordingly, the present invention provides a differential thermobalance free of such disadvantages.

The present invention relates to a method in which two links are arranged in opposite directions on each of two parallel vertical planes which are sufficiently close to each other, or their positions are offset so as not to be opposed to each other, or a vertical rod is divided into a branch rod. The length of the arm of the balance is made sufficiently long by means such as the provision of a weight to improve the detection sensitivity of the weight change. The embodiment will be described below.

FIG. 2 (a) is a perspective view of an embodiment of the present invention, and FIG. 2 (b) is a diagram showing a plan configuration thereof. That is, two arms 1 and 2 and 3 and 4 which are horizontally arranged in two parallel vertical planes having a sufficiently small distance d are arranged so as to be substantially opposed to each other, and the ends opposite to each other. Is rotatably connected to the fixed portion, and the other end of each arm is
Alternatively, two sets of links are formed by being rotatably connected to each other. Vertical bar 5.6 on this link
Is suspended at both ends of a balance arm 8 which is sufficiently long compared to the distance d, is inclined with respect to a plane including the links, and supports a central fulcrum 7. The rod 5.6 is provided with support rods of the sample and standard sample holders 9.10 arranged in a plane including the above-mentioned links so as to face each other in a horizontal plane. Therefore, this device increases the distance of the vertical bar 5.6 by increasing the length of the arm 8 of the balance by arranging the two sets of links at substantially the same position in opposite directions, thereby increasing the sensitivity of detecting a change in weight. It was done.

3, 4 and 5 are other embodiments of the present invention. In each figure, (a) is a perspective view and (b) is a view showing a plan configuration. In other words, the apparatus of FIG. 3 places two horizontal arms 1 and 2 and 3 and 4 horizontally in two parallel vertical planes spaced sufficiently small so that they are staggered from each other at the same height. And the ends of each arm in the same direction are rotatably connected to the fixed portions, respectively.
The other end of the arm in the same plane is rotatably connected to a vertical bar 5.6, thereby forming two sets of links similarly to the apparatus of FIG. It is the same as the device of the above. Therefore this device is compatible with arms 1.2 and 3.4
The arm 8 of the balance is made sufficiently long by staggering the horizontal positions of the sample and the sample to detect a change in weight of the sample with high sensitivity. Further, similarly to the apparatus shown in FIG. 2, since both the holder 9.10 for the sample and the like and both ends of the balance are arranged in the constituent surfaces of the respective links, there is no disadvantage that a falling moment is generated.

The device shown in FIG. 4 has the same function and effect as the device shown in FIG. 2, in which the arm 1.2 in the configuration shown in FIG. Further, the apparatus of FIG.
The two sets of links shown in FIG. 3 are opposed to each other, and a sufficiently long horizontal branch bar 11 is protruded from the vertical bar 5 so that its tip is suspended on one end of the arm 8 of the balance. .
Therefore, even with such a configuration, the arm of the balance is lengthened,
Weight detection sensitivity can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of the configuration of a conventional differential thermobalance. 2, 3, 4, and 5 are all embodiments of the present invention, in which (a) is a perspective view,
(B) is a diagram showing a planar configuration. In the figure,
1.2.3.4 is the horizontal arm that constitutes the link, 5.6 is the vertical bar,
7 is a balance fulcrum, 8 is a balance arm, 9.10 is a sample or standard sample container, and 11 is a branch rod.

Claims (5)

(57) [Claims] 1. Two horizontal arms of equal length are arranged in a vertical plane, their ends in the same direction are rotatably connected to a fixed part, and the other ends are vertical rods. Two sets of links rotatably connected to each other are arranged in a vertical plane at a sufficiently small interval, and a tip of a support rod protruding from a vertical rod in the two sets of links into a plane including each link. The holders for the sample and the standard sample respectively mounted on the two sets of links are arranged sufficiently close to each other, and the vertical bar in each of the two sets of links is sufficiently long compared to the interval between the two sets of links and on a surface including each link. Differential thermobalance attached to both ends of the arm of the balance that inclines 2. A differential thermobalance according to claim 1, wherein two sets of links are arranged at substantially the same position and in opposite directions. 3. A differential thermobalance according to claim 1, wherein two sets of links are arranged at different positions in the same direction so as not to face each other. 4. A differential thermobalance according to claim 1, wherein two sets of links are arranged at different positions in the vertical direction. 5. The two sets of links are arranged at substantially the same position in the same direction, and at least one of the vertical bars in each link is connected to the tip of a branch bar projecting into a plane including the link by the arm of the balance. Claim 1 attached to the tip
Term differential thermobalance