JP3040179B2 - Balance type thermal analyzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balance type thermal analyzer, and more particularly to an improvement in a device for performing a thermogravimetric analysis or a thermomechanical analysis of a sample by a balance type structure.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional differential thermogravimetric analysis (TG-DTA) apparatus. In the figure, a sample 1 and a reference material 2 for reference are an electric furnace 3
The sample 1 and the reference material 2 are placed in the chamber and given a predetermined temperature by the electric furnace 3, and are placed on the sample holders 4a and 4b. These two sample holders 4
The sub beams 5a and 5b are attached to the main beams 7a and 5b, respectively. The sub beams 5a and 5b are rotatable about a sub fulcrum B set on the support members 6a and 6b.
Connected to. The main beam 7 is supported by a torsion band 8 so as to maintain a balance about the center fulcrum A.
And appears as the inclination of the main beam 7 through. Further, the sub-beams 5a and 5b are pulled by a pulling wire 16 at a lower portion thereof, thereby preventing the sample holder 4 and the sub-beam 5 from swaying and stabilizing the balance. Position is kept constant.

A control coil 10 is mounted near the torsion band 8 supporting the main beam 7 so as to be integral with the main beam 7. Is attached. Therefore, when the main beam 7 is tilted, the main beam 7 can be returned to the original horizontal state by supplying a current to the control coil 10.

The main beam 7 is provided with a shutter piece 12 directed downward, while a light emitting section 1 is provided on the apparatus main body side.
3a and a light receiving portion 13b, and the shutter piece 12 blocks the light emission of the light emitting portion 13a.
Can be detected by the light reception of the light receiving section 13b.

The light receiving signal from the light receiving section 13b is input to a weight measuring circuit 14a in the measuring circuit 14, whereby the weight measurement is started. That is, the weight measurement circuit 14a detects a current flowing through the control coil 10 and measures a change in weight of the sample 1 from the current value. In addition, thermocouples 15a and 15b are provided on the mounting surfaces of the sample 1 and the reference material 2, and the voltage values of the thermocouples 15a and 15b are input to a temperature measuring circuit 14b, whereby the temperature of the sample 1 is reduced. Along with the measurement, a minute temperature difference between the reference substance 2 and the sample 1 is measured. In this way, the apparatus shown in FIG. 4 can measure a change in weight and a change in temperature due to the temperature given by the electric furnace 3, and can perform various analyses.

Incidentally, the sample holder 4 is a balance beam (sub-beam 5) for accurately performing weight measurement and temperature measurement.
Must be maintained in a vertical position, and for this purpose an adjustment mechanism as shown in FIG. 5 is provided. In FIG. 5, the sample holder 4 is fitted and fixed to a first fixture 17a, and the first fixture 17a is connected to the auxiliary beam 5 via a second fixture 17b. Tool 17a
Is connected to the second fixture 17b so as to be rotatable on a vertical plane. The second fixture 17b is rotatably connected to the auxiliary beam 5 by a screw in a horizontal plane. Therefore,
The sample holder 4 is adjusted to a vertical state by rotating the first fixture 17a in the direction A in the vertical plane and rotating the second fixture 17b in the horizontal plane. .

[0007]

However, in the above-mentioned conventional balance-type thermal analyzer, the first fixture 17a and the second fixture 17b are connected to the sub-beam 5 by the screw fastening type as described above. Therefore, there is a problem that initial setting for keeping the sample holder 4 vertical is complicated.
Moreover, since the adjustment for maintaining the vertical state is performed by moving the fixture 17 in the vertical direction and the horizontal direction, it takes a long time for the adjustment.

The adjustment mechanism shown in FIG. 5 is housed in the housing of the apparatus together with the balance beam, and after adjustment by initial settings at the time of shipment, the user himself / herself appropriately maintains the sample holder 4 in a vertical state. Could not be easily adjusted. The above adjustment is performed with the sub beam 5 of FIG. 4 clamped and the beam fixed, but this clamping is also performed by disassembling the housing.

The above is not only when the sample holder is kept vertical in the differential thermogravimetric analyzer, but also when a rod-like body such as a detection rod of a thermomechanical analyzer for measuring expansion and contraction of the sample 1 is vertically moved. A similar problem also arises when maintaining at.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to make it easy to adjust a sample holder, a detection rod, and the like to a vertical state, and to make this adjustment by a user himself from outside the housing. An object of the present invention is to provide a balance type thermal analyzer that can be executed.

[0011]

According to a first aspect of the present invention, there is provided a rod-shaped rod vertically arranged at an end of a balance beam for transmitting a change of a sample due to heat to the balance beam. in balance heat analysis apparatus having a body, the
The supporting ball provided at the lower side of the rod-like body fitted in the ball grooves provided on the balance beam side, the support baud
The rod is placed on the rod to restrict its horizontal rotation.
A rotation restricting member is provided to rotate the balance beam in the rotation direction.
The supporting ball by the biasing force of the spring member.
With this, when a force exceeding a predetermined value is applied, the rod-shaped body
The rod is rotated to the balance beam rotation direction.
It is characterized by being attached to a balance beam .

According to a second aspect of the present invention, an operation section is arranged outside the housing in a housing for storing the balance beam.
The clamping member is provided with a state, gripping fixed to the balance beam by the clamping member in the outside of the housing of the operating unit
And wherein and Turkey.

[0013]

According to the first aspect of the invention, when a predetermined force or more is applied to the rod, the ball of the rod moves in the ball beam rotating direction in the ball groove of the balance beam. Can be easily set to a vertical state.

According to the second aspect of the present invention, the balance beam is gripped and fixed by operating the clamp member from the outside of the housing. In this state, the bar is directly moved as described above. Adjustment to a vertical state.

[0015]

FIG. 1 shows the configuration of a differential thermogravimetric analyzer (corresponding to FIG. 4) according to the embodiment. In the drawing, the balance beam portion is composed of a flange 20, a side wall plate 21 and the like. A sample holder 22 which is housed in a housing to be set and sets the sample 1 and the reference substance 2 on the upper part of the flange 20.
a, 22b (rods) are provided to protrude. On the other hand, the two sub beams 5a and 5b are connected to the main beam 7 so as to rotate about the sub fulcrum B, and the main beam 7 is supported by the torsion band 8 so as to be rotatable at the center fulcrum A. ing. The torsion band 8 is attached to the housing by the attachment fitting 23, and holds the entire balance beam structure including the sub beam 5, the main beam 7, the sample holder 22, and the like. The sub-beams 5a and 5b are pulled by the pull wire 16 in order to prevent the sample holder 22 and the sub-beam 5 from swaying and to stabilize the entire balance beam.

A control coil 10 is provided on the main beam 7, and a magnet 11 is provided around the control coil 10. The weight of the sample 1 is measured by passing a current through the control coil 10. In such an apparatus, the sample holders 22a and 22b have an attachment 25 underneath.
a, 25b, and the attachments 25a, 2
5b is an auxiliary beam 5a, 5b by a leaf spring 26a, 26b.
Connect to

FIG. 2 shows a connection state of the attachment 25. As shown in FIG. 2A, a ball 27 is provided at the tip of the attachment 25, while the ball 27 is provided on the side of the sub-beam 5. A ball groove 28 into which the protrusion 27 is fitted is formed. At the upper end of the ball 27, a leaf spring 26 having a through hole 29 is arranged.
Is firmly fixed to the sub-beam 5 on one side as shown. In this case, the leaf spring 26 is made to float by a predetermined distance from the upper surface of the sub beam 5 by adjusting the size of the through hole 29. When the leaf spring 26 is fixed with the screw 30, the chain line 100 And the attachment 25 is fixedly held by a predetermined urging force. Therefore, normally, the sample holder 22 connected to the attachment 25 can be fixedly held in a fixed state, and the sample holder 22 can be moved in all directions by applying a predetermined force or more.

FIG. 2B is a view of the attachment 25 and the leaf spring 29 viewed from above without the sample holder 22 attached thereto, and shows a stopper 27 provided on the ball 27.
a is fitted in the groove of the sub-beam 5 in a state of restricting the movement in the horizontal direction, that is, the direction C in the drawing, while leaving a movable area in the depth direction. Prevents rotation. The attachment 25 is provided with a plurality of pin holes 31.
The sample holder 22 and the attachment 25 are connected by inserting a pin of the sample holder 22 into the pin 1, and a thermocouple or the like is disposed in the pin hole 31.

Next, a clamp member for clamping the balance beam will be described. In FIG. 1, a clamp member 32 for gripping a horizontal portion of the two sub beams 5a and 5b is provided.
a, 32b are provided, and the clamp members 32a, 32b
The operation rod 33 for operating the b is provided so as to protrude from the upper part of the flange 20.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1. As shown, the clamp member 32 includes a screw rod 34 connected to an operation rod 33 and a screw 34 of the screw rod 34.
a and 34b are formed by gripping bodies 35 and 36 which are screwed to each other. The threaded portions 34a and 34b of the threaded rod 34 have a reverse screw relationship to each other. When the operating portion 33 is rotated, for example, rightward, the grippers 35 and 36 reduce the distance to move the sub-beam 5 When the operation unit 33 is rotated to the left, the grippers 35 and 36 are separated and the clamped state is released.

The embodiment has the above configuration. For example, when the user himself / herself adjusts the sample holder 22 to the vertical state after the product is shipped, the operation rod 33 is rotated and the gripper shown in FIG. Secondary beams 5a, 5b by holding bodies 35, 36
To fix the balance beam as a whole. And
If the sample holders 22a and 22b are moved in this state, the sample holders 22a and 22b can be adjusted to a vertical state. In addition, each of the specimen holders 2 and 35 is provided with 35 and 36.
2 itself can be easily replaced.

In the above embodiment, the attachment 25 is fixed by the leaf spring 26. However, the present invention is not limited to this. For example, the attachment 25 is connected to the auxiliary beam 5 by a fixture using a spring. It may be. In the above embodiment, the sample holder of the gravimetric analyzer has been described, but the detection rod of the thermomechanical analyzer,
The present invention can be applied to other types of rods that are maintained vertically.

[0023]

As described above, according to the first aspect of the present invention, the supporting ball provided on the rod-like body is fitted into the ball groove provided on the balance beam side, and the rotation ruler is provided.
When a force greater than a predetermined value is applied by the control member and the spring member
The rod can be rotated in the balance beam rotation direction, so that the sample holder, detection rod, etc. can be easily adjusted vertically, and the above adjustment is made by directly operating the sample holder, detection rod, etc. Becomes possible.

According to the second aspect of the present invention, since the operating section is disposed outside the housing and the clamp member for gripping the balance beam is provided, the user himself can disassemble the housing without disassembling the housing. The balance beam can be gripped and fixed from the outside of the body, and the adjustment of the sample holder and the detection rod to the vertical state can be executed from the outside, and the work of exchanging the sample holder becomes easy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a balance-type thermal analyzer according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a structure of an attachment for attaching a sample holder to a sub beam, wherein FIG. 2A is a front view and FIG. 2B is a top view.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1 showing a configuration of a clamp member.

FIG. 4 is a schematic diagram showing the overall configuration of a conventional balance beam.

FIG. 5 is a partial sectional view showing a conventional vertical adjustment mechanism of a sample holder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sample, 3 ... Electric furnace, 4,22 ... Sample holder, 5 ... Sub beam, 7 ... Main beam, 8 ...
Torsion band, 20… flange, 25… attachment, 26… leaf spring, 27… ball,
28: ball groove, 32: clamp member, 33
… Operation rod, 34… screw rod, 35, 36… gripping body.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Patent Publication No. 54-27158 (JP, B2) Japanese Utility Model Publication No. 58-42925 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G01N 5/00-5/04

Claims (2)

(57) [Claims] 1. A thermoelectric device arranged vertically at the end of the balance beam,
Changes in the sample due toTheRods to be transmitted to the balance beam
In a balance type thermal analyzer havingLower end of the rod Provided on the sideFor supportthe ballthe aboveHeaven
Fits into the ball groove provided on the scale beam side,The above-mentioned rod-shaped body is rotated horizontally in this supporting ball.
A rotation that regulates rotation and rotates in the rotation direction of the balance beam.
Provide a rolling regulation member, In order to fix this support ball with the urging force of the spring member
The rod-shaped body is pressed by the balance when a predetermined force or more is applied.
The rod is rotated by the balance so as to rotate in the beam rotation direction.
Attached to the beam Balance type thermal analyzer
Place. To 2. A casing for housing the balance beam, this
The clamping member is provided in the state in which the operation unit outside the housing, the first, wherein the benzalkonium be gripping fixing the balance beam in the casing outside of the operation portion by the clamping member
A balance-type thermal analyzer according to claim 1.