Thermal analysis apparatus

Abstract

To provide a thermal analyzer having a structure in which a load transmission shaft connected to a load generator and a probe can be attached to and detached from each other, the thermal analyzer suppressing damage due to falling of the probe and facilitating attachment and detachment work.SOLUTION: A probe 10 extending in an axial direction L and having one end in contact with a sample S to apply a load to the sample, a probe joint 10c provided at the other end of the probe, and a load generator 5, A thermal analyzer 1 includes a load transmission shaft 17 provided with a connection joint 17c at the other end thereof and configured to transmit a load of a load generator to a probe by connecting the connection joint to a probe joint, a displacement detector 6a and a 6b configured to detect a dynamic characteristic of a sample by detecting an axial displacement of the probe, and a heating oven 12a, wherein the connection joint and the probe joint each have a permanent magnetic 10m and a 17m, and the connection joint and the probe joint can be connected by an attraction force based on a magnetic force between the permanent magnets.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a thermal analysis device for measuring the thermal behavior of a sample. [Background technology]

[0002] Traditionally, a technique known as thermal analysis has been used to evaluate the thermal properties of a sample. This involves heating the sample and measuring its thermal behavior (physical changes) as the temperature changes. Thermal analysis is defined in JIS K 0129:2005, "General Rules for Thermal Analysis," and includes any method for measuring the physical properties of a sample under program-controlled temperature control. There are five commonly used thermal analysis methods: (1) differential thermal analysis (DTA), which detects temperature (temperature difference); (2) differential scanning calorimetry (DSC), which detects heat flow differences; (3) thermogravimetry (TG), which detects mass (weight change); (4) thermomechanical analysis (TMA), which detects mechanical properties; and (5) dynamic mechanical analysis (DMA).

[0003] Among these, thermomechanical analysis (TMA) and dynamic mechanical analysis (DMA) apply a load to a sample using a probe, and detect the resulting change in the shape of the sample as the displacement of the probe (see, for example, Patent Document 1). This makes it possible to measure the elastic modulus or expansion coefficient of the sample as a function of temperature or time.

[0004] In the thermomechanical analyzer described in Patent Document 1, the operating shaft (load transmission shaft) on the load generator side and the probe are detachable by a male screw and a female screw. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3636110 Summary of the Invention [Problem to be solved by the invention]

[0006] By the way, quartz glass or ceramic, which is less susceptible to thermal expansion than metal, is often used for the probe. However, if the probe is designed to be detachable from the operating shaft, there is a risk that the probe may fall and be damaged when detached. Furthermore, the task of screwing the probe to the actuation shaft while holding the probe with one hand to prevent it from dropping is difficult and requires skill.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a thermal analysis device that has a structure in which the load transmission shaft connected to the load generator and the probe can be detached, which prevents the probe from being damaged by being dropped and makes the detachment process easier. [Means for solving the problem]

[0008] In order to achieve the above object, a thermal analysis apparatus according to a first aspect of the present invention includes a probe extending in an axial direction, one end of which is in direct or indirect contact with a sample and which applies a load to the sample, a probe joint provided at the other end of the probe, a load generator which generates a load in the axial direction, a load transmission shaft which extends in the axial direction, one end of which is connected directly or indirectly to the load generator and the other end of which is provided with a connection joint, and which connects the connection joint to the probe joint to transmit the load of the load generator to the probe, a displacement detector which detects mechanical properties of the sample by detecting displacement of the probe in the axial direction, and a heating furnace for heating the sample, wherein the connection joint and the probe joint both have permanent magnets, and the connection joint and the probe joint can be connected by an attractive force based on a magnetic force between the permanent magnets.

[0009] According to this thermal analysis device, when the probe joint is attached to the connection joint, the permanent magnets come into contact or are close to each other, and the connection joint and the probe joint can be connected (attracted) by an attraction force based on the magnetic force between the permanent magnets. This prevents the probe from falling and breaking when attaching or detaching the probe to or from the load transmission shaft. It also makes it unnecessary to connect the probe to the load transmission shaft while holding the probe with one hand to prevent the probe from falling, making the attachment and detachment process easier.

[0010] a load generator that generates a load in the axial direction; a load transmission shaft that extends in the axial direction, has one end connected directly or indirectly to the load generator and has the other end connected to a connection joint, and transmits the load of the load generator to the probe by connecting the connection joint to the probe joint; a displacement detector that detects mechanical properties of the sample by detecting displacement of the probe in the axial direction; and a heating furnace for heating the sample, wherein one of the connection joint and the probe joint has a permanent magnet, and an attraction member made of a soft magnetic material is provided on the other of the connection joint or the probe joint at a position facing the permanent magnet, and the connection joint and the probe joint can be connected by an attraction force based on a magnetic force between the permanent magnet and the soft magnetic material.

[0011] According to this thermal analysis device, when the probe joint is attached to the connection joint, the permanent magnet and the attraction member come into contact or proximity, and the connection joint and the probe joint can be connected (attracted) by the attraction force based on the magnetic force between the permanent magnet and the attraction member. This prevents the probe from falling and breaking when attaching or detaching the probe to or from the load transmission shaft. It also makes it unnecessary to connect the probe to the load transmission shaft while holding the probe with one hand to prevent the probe from falling, making the attachment and detachment process easier.

[0012] a load generator that generates a load in the axial direction; a load transmission shaft that extends in the axial direction, has one end connected directly or indirectly to the load generator and has the other end connected to a connection joint, and transmits the load of the load generator to the probe by connecting the connection joint to the probe joint; a displacement detector that detects mechanical properties of the sample by detecting displacement of the probe in the axial direction; and a heating furnace for heating the sample, wherein the connection joint has an electromagnet, and an attraction member made of a permanent magnet or a soft magnetic material is provided in the probe joint at a position facing the electromagnet, and the connection joint and the probe joint can be connected by an attraction force based on a magnetic force between the electromagnet and the permanent magnet or the soft magnetic material.

[0013] According to this thermal analysis device, when the probe joint is attached to the connection joint while the electromagnet is energized, the electromagnet and the attraction member come into contact or proximity with each other, and the connection joint and the probe joint can be connected (attracted) by an attraction force based on the magnetic force between the electromagnet and the attraction member. This prevents the probe from falling and breaking when attaching or detaching the probe to or from the load transmission shaft. It also makes it unnecessary to connect the probe to the load transmission shaft while holding the probe with one hand to prevent the probe from falling, making the attachment and detachment process easier.

[0014] In the thermal analysis apparatus of the present invention, a magnetic shield member may be provided along the axial direction between the connection joint and the load generator and the displacement detector. According to this thermal analysis device, it is possible to prevent the magnetic force of the magnets provided in the connection joint and the probe joint from interfering with the detection signal of the displacement detector, thereby preventing a decrease in measurement accuracy.

[0015] The thermal analysis apparatus of the present invention may further include a connecting member that mechanically connects the connection joint and the probe joint. The connection between the connection joint and the probe joint by the magnetic force of a permanent magnet or an electromagnet may have a weak attraction force that is low enough to prevent the probe from falling off during attachment / detachment operations. Therefore, if a connecting member such as a screw that mechanically connects the connection joint and the probe joint is separately provided, thermal analysis can be performed in a state where the connection joint and the probe joint are securely fixed by the connecting member.

[0016] In the thermal analysis apparatus of the present invention, the probe may be made of quartz glass or ceramic, and the probe joint may be made of a metal or an alloy. When the probe is made of quartz glass or ceramic, there is a risk that the probe may fall and be damaged when being attached or detached, and therefore the present invention is effective.

[0017] A thermal analysis apparatus according to a fourth aspect of the present invention is a thermal analysis apparatus comprising: a probe extending in an axial direction, one end of which is in direct or indirect contact with a sample and which applies a load to the sample; a probe joint provided at the other end of the probe; a load generator which generates a load in the axial direction; a load transmission shaft which extends in the axial direction, one end of which is connected directly or indirectly to the load generator and the other end of which is provided with a connection joint, and which transmits the load of the load generator to the probe by connecting the connection joint to the probe joint; a displacement detector which detects a mechanical property of the sample by detecting a displacement of the probe in the axial direction; and a heating furnace for heating the sample, wherein the connection joint has a blind hole for inserting the probe joint, and has a plunger which protrudes retractably from the outside to a position inward beyond the inner surface of the blind hole along a radial direction intersecting the axial direction, The probe joint is characterized in that a recess that is recessed in the radial direction is provided at a portion of the probe joint that faces the plunger, and the tip of the plunger can be fitted into the recess, thereby enabling the connection joint and the probe joint to be connected.

[0018] According to this thermal analysis device, when the probe joint is attached to the connection joint, the tip of the plunger fits into the recess, thereby connecting the connection joint and the probe joint. This prevents the probe from falling and breaking when attaching or detaching the probe to or from the load transmission shaft. It also makes it unnecessary to connect the probe to the load transmission shaft while holding the probe with one hand to prevent the probe from falling, making the attachment and detachment process easier. [Effects of the Invention]

[0019] According to the present invention, a thermal analysis device is obtained in which the load transmission shaft connected to the load generator and the probe can be detached, which prevents the probe from being damaged by being dropped and makes the detachment process easier. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a diagram showing the configuration of a thermal analysis instrument according to an embodiment of a first aspect of the present invention. [Figure 2] FIG. 2 is a partially enlarged cross-sectional view of the vicinity of a connection joint and a probe joint according to the embodiment of the first aspect of the present invention. [Figure 3] FIG. 3 is a partially enlarged cross-sectional view showing the configuration of a thermal analysis device according to an embodiment of a second aspect of the present invention. [Figure 4] FIG. 10 is a partially enlarged cross-sectional view showing the configuration of a thermal analysis device according to an embodiment of a third aspect of the present invention. [Figure 5] FIG. 10 is a partially enlarged cross-sectional view showing the configuration of a thermal analysis device according to an embodiment of a fourth aspect of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of a thermal analysis device (thermomechanical analysis (TMA) device) 1 according to an embodiment of the first aspect of the present invention. The thermal analysis apparatus 1 includes a rod-shaped probe 10 extending in an axial direction L (the vertical direction in FIG. 1), a load generator 5 that generates a load in the axial direction L of the probe 10, a load transmission shaft 17 that connects the load generator 5 and the probe 10, displacement detectors 6a to 6b that detect the displacement of the probe 10 in the axial direction L, and heating furnaces 12a and 12b for heating the sample S.

[0022] Each component of the thermal analysis apparatus 1 is supported by a frame 14. A sample holding member (sample tube) 11 extends downward from the frame 14 (toward the sample S), and the sample S is placed on the horizontal surface of the sample holding member 11. In this example, one end (lower end) of the probe 10 is in direct contact with the upper end of the sample S, and a load is applied to the sample S. Furthermore, a thermocouple 22 for measuring temperature is placed near the sample S.

[0023] The load transmission shaft 17 has a rod shape extending in the axial direction L, an upper end (one end) of which is fixed (connected) to the load generator 5, and a lower end (other end) of which is provided with a connection joint 17c. Although not shown, the load generator 5 includes a coil and a permanent magnet surrounding the coil, and when a current flows through the coil, the coil is displaced in the axial direction L to generate a load. The load transmission shaft 17 may be directly connected to the load generator 5 or may be indirectly connected to the load generator 5 (i.e., the upper end (one end) of the load transmission shaft 17 may be connected to an intermediate shaft fixed to the load generator 5).

[0024] On the other hand, a probe joint 10c is connected to the other end (upper end) of the probe 10, and the load of the load generator 5 is transmitted to the probe 10 by connecting a connection joint 17c to the probe joint 10c. The probe 10 and the load transmission shaft 17 are connected coaxially.

[0025] A core (iron core) 6b made of a conductor is fixed to the outer periphery of the load transmission shaft 17 in the axial direction L at a position between the connection joint 17c and the load generator 5, and a differential transformer (primary coil and secondary coil) 6a is arranged around the core 6b. Furthermore, a detector 6c detects the voltage of the differential transformer 6a. When the position of the core 6b (and thus the probe 10) changes relative to the differential transformer 6a, a voltage is generated in the differential transformer 6a in accordance with the displacement, making it possible to detect the displacement of the core 6b (and thus the probe 10) in the axial direction L. The differential transformer 6a and the core 6b constitute a "displacement detector."

[0026] A heating furnace consisting of a furnace body 12a and a heater 12b arranged around the furnace body 12a is provided around the sample S, and the temperature of the heating furnace is controlled by a predetermined control unit.

[0027] The load signal generator 20 generates a load signal that operates the load generator 5. The load signal generator 20 is, for example, an electronic circuit in which various electronic components and chips are mounted on a circuit board. An analog signal is output from the load signal generator 20 to the load generator 5, and a predetermined load is generated.

[0028] The load generated by the load generator 5 is applied to the sample S via the load transmission shaft 17 and the probe 10 . On the other hand, the displacement etc. caused in the sample S by this load is transmitted to the core 6b through the probe 10 and the load transmission shaft 17, and is detected as a displacement of the position of the core 6b relative to the differential transformer 6a.

[0029] The displacement detection signal from the differential transformer 6a and the core 6b is sent to the displacement detector 6c and converted into a displacement signal. A load signal output from the load detector 7 and a displacement signal output from the displacement detector 6c are sent to a calculator 9, which calculates the physical quantity (mechanical property) of the sample S.

[0030] In this example, the probe 10 is rod-shaped and made of quartz glass or ceramic, and the probe joint 10c is rod-shaped and made of a metal or alloy such as stainless steel or titanium. The probe joint 10c is connected to one end of the probe 10 with an adhesive or the like. The load transmission shaft 17 and the connection joint 17c are integrally formed from a metal or alloy such as stainless steel or titanium.

[0031] In this example, the load transmission shaft 17 is attached at two positions in the axial direction L to leaf springs 24 and 26 that extend laterally (in a direction perpendicular to the axial direction L). This allows the load transmission shaft 17, and in turn the probe 10 connected to the load transmission shaft 17, to be displaced only in the axial direction L, restricting movement in the lateral direction, thereby preventing the probe 10 from moving inadvertently in the lateral direction.

[0032] Next, the characteristic features of the present invention will be described. As shown in FIG. 2, in the thermal analysis apparatus 1 according to the first aspect of the present invention, the connection joint 17c and the probe joint 10c both have permanent magnets 17m and 10m, respectively. Specifically, the connection joint 17c has a cylindrical non-through hole 17h extending in the axial direction L for inserting the probe joint 10c. A cylindrical accommodation hole 17r having a smaller diameter than the non-through hole 17h is provided upward from the bottom surface of the non-through hole 17h, and a cylindrical permanent magnet 17m is embedded in the accommodation hole 17r and fixed in place with an adhesive.

[0033] On the other hand, a cylindrical non-through hole 10r is provided downward from the surface (top surface) on the other end (upper end) side of the probe joint 10c, and a cylindrical permanent magnet 10m is embedded in the hole 10r and fixed using an adhesive. When the probe joint 10c is inserted into the non-through hole 17h, the permanent magnets 17m, 10m come into contact or come close to each other, and the connection joint 17c and the probe joint 10c can be connected (attracted) together by an attractive force based on the magnetic force between the permanent magnets 17m, 10m.

[0034] This makes it possible to prevent the probe 10 from dropping and being damaged when attaching or detaching the probe 10 to or from the load transmission shaft 17. Furthermore, it is no longer necessary to connect the load transmission shaft 17 and the probe 10 while holding the probe 10 with one hand to prevent the probe 10 from dropping, which makes the attachment and detachment work easier.

[0035] The connection between the connection joint 17c and the probe joint 10c by the magnetic force of the permanent magnets 17m and 10m may be a weak attraction force that prevents the probe 10 from falling during the attachment / detachment process. Therefore, if a connecting member such as a screw that mechanically connects the connection joint 17c and the probe joint 10c is separately provided, thermal analysis can be performed with the connection joint 17c and the probe joint 10c securely fixed by the connecting member.

[0036] As an example of this connecting member, as shown in Figure 2, a structure in which a threaded hole 17s is formed that extends radially from the outer surface of the connecting joint 17c in a direction intersecting the axial direction L and penetrates to the non-through hole 17h, and a male screw 17T is screwed into this threaded hole 17s can be given. A groove 10d that is recessed in the radial direction and extends around the entire circumference of the probe joint 10c is provided in the probe joint 10c at a location facing the head of the male screw 17T. When the male screw 17T is screwed, the tip of the male screw 17T fits into the groove 10d, mechanically connecting the connection joint 17c and the probe joint 10c. The screw hole 17s, the male screw 17T, and the recessed groove 10d correspond to the "connecting member" in the claims.

[0037] As shown in FIG. 1, in this example, a magnetic shield member 19 is provided along the axial direction L between the connection joint 17c and the load generator 5 and the displacement detectors 6a and 6b. This prevents the magnetic force of the magnets provided in the connection joint 17c and the probe joint 10c from interfering with the detection signals of the displacement detectors 6a and 6b, thereby preventing a decrease in measurement accuracy. The magnetic shield member 19 can be made of iron, silicon steel, permalloy, permendur, or the like. It should be noted that the detector 6c does not detect displacement itself, so the positional relationship between the detector 6c and the magnetic shield member 19 does not matter.

[0038] Next, a thermal analysis apparatus according to a second aspect of the present invention will be described with reference to Fig. 3. The thermal analysis apparatus according to the second aspect is the same as the thermal analysis apparatus according to the first aspect except that the permanent magnet 10m of the probe joint 10c is replaced with an attraction member 10s made of a disk-shaped soft magnetic material, and therefore a description of the other components will be omitted. As shown in FIG. 3, a disk-shaped suction member 10s is attached to the surface (upper surface) of the other end (upper end) of the probe joint 10c using an adhesive. When the probe joint 10c is inserted into the non-through hole 17h, the permanent magnet 17m and the attraction member 10s come into contact or are close to each other, and the connection joint 17c and the probe joint 10c can be connected (attracted) by the attraction force based on the magnetic force between the permanent magnet 17m and the attraction member 10s.

[0039] The adsorption member 10s may be made of iron, silicon steel, permalloy, permendur, or the like. Furthermore, as another embodiment of the thermal analysis apparatus of the second aspect, a configuration can be used in which the permanent magnet 17m of the connection joint 17c is replaced with an attraction member made of a soft magnetic material, and the attraction member 10s of the probe joint 10c is replaced with a permanent magnet.

[0040] Next, a thermal analysis apparatus according to a third aspect of the present invention will be described with reference to Fig. 4. The thermal analysis apparatus according to the third aspect is the same as the thermal analysis apparatus according to the second aspect except that the structures and materials of the load transmission shaft 172 and the connection joint 17c2 are changed and an electromagnet 30 is disposed around the connection joint 17c2, and therefore a description of the other configurations will be omitted. As shown in Figure 4, a cylindrical accommodating hole 17r2 with a smaller diameter than the non-through hole 17h is provided upward from the bottom surface of the non-through hole 17h2 of the connection joint 17c2, and a cylindrical core (iron core) 30c is embedded in the accommodating hole 17r2 and fixed using an adhesive. Furthermore, a coil 30a is disposed around the core 30c, and these two components form the electromagnet 30. When a current is applied to the coil 30a, a magnetic force is generated around the core 30c.

[0041] On the other hand, a disk-shaped suction member 10s is attached to the surface (upper surface) of the other end (upper end) of the probe joint 10c using an adhesive. When the probe joint 10c is inserted into the non-through hole 17h2 while the coil 30a is energized, the core 30c and the attraction member 10s come into contact or come close to each other, and the connection joint 17c2 and the probe joint 10c can be connected (attracted) by the attraction force based on the magnetic force between the core 30c and the attraction member 10s. The connection joint 17c2 (and the load transmission shaft 172 integrated with the connection joint 17c2) is made of a non-magnetic material such as Ti so that the magnetic field generated by the coil 30a reaches the core 30c.

[0042] Next, a thermal analysis apparatus according to a fourth aspect of the present invention will be described with reference to Fig. 5. The thermal analysis apparatus according to the fourth aspect is the same as the thermal analysis apparatus according to the first aspect except that permanent magnets 17m and 10m are not used, plunger 40 is provided in connection joint 17c3, and the structure of probe joint 10c2 is changed, so description of other configurations will be omitted.

[0043] The connection joint 17c3 has a blind hole 17h3 extending in the axial direction L for inserting the probe joint 10c2. A plunger hole 41h is formed in the connecting joint 17c3 in a radial direction intersecting the axial direction L, penetrating to the non-through hole 17h3. A plunger 40 is disposed in the plunger hole 41h, and a spring 42 is built into the base (radially outer portion) of the plunger 40, and the spring 42 elastically expands and contracts in the radial direction. This allows the plunger 40 to move radially back and forth inside the plunger hole 41h, and the tip of the plunger 40 can protrude retractably and expandably inward beyond the inner surface of the non-through hole 17h3.

[0044] On the other hand, a wedge-shaped recess 10v is provided in the probe joint 10c2 at a portion facing the plunger 40 (the tip thereof). When the probe joint 10c2 is inserted into the non-through hole 17h3, the outer surface of the probe joint 10c2 first compresses the plunger 40 radially outward. When the probe joint 10c2 is further inserted to a position where the plunger 40 faces the recess 10v, the tip of the plunger 40 protrudes inward beyond the inner surface of the non-through hole 17h3 and fits into the recess 10v, thereby connecting the connection joint 17c3 and the probe joint 10c2. In this example, a connecting member (screw hole 17s, male screw 17T, and recessed groove 10d) similar to that shown in FIG. 2 is provided on the tip side of plunger 40.

[0045] The present invention is not limited to the above-described embodiments. For example, the shapes of the probe, the connecting joint, the probe joint, etc. are not limited. [Explanation of symbols]

[0046] 1 Thermal analysis device 5 Load Generator 6a, 6b Displacement detector 10 probes 10c, 10c2 probe fittings 10v recess 12a, 12b Furnace 17, 172 Load transmission shaft 17c, 17c2, 17c3 connection fittings 10m, 17m permanent magnet 10s Adsorption material 19 Magnetic shielding material 10d, 17s, 17T connecting parts 17h1~17h3 Non-through hole 30 Electromagnet 40 Plunger S sample L axis direction

Claims

1. a probe extending in an axial direction, one end of which directly or indirectly contacts a sample and applies a load to the sample; a probe joint provided at the other end of the probe; a load generator that generates a load in the axial direction; a load transmission shaft extending in the axial direction, one end of which is connected directly or indirectly to the load generator and the other end of which is provided with a connection joint, and which transmits the load of the load generator to the probe by connecting the connection joint to the probe joint; a displacement detector that detects a mechanical property of the sample by detecting a displacement of the probe in the axial direction; a heating furnace for heating the sample; In a thermal analysis apparatus comprising: A thermal analysis apparatus characterized in that the connection joint and the probe joint both have permanent magnets, and the connection joint and the probe joint can be connected by an attractive force based on a magnetic force between the permanent magnets.

2. a probe extending in an axial direction, one end of which directly or indirectly contacts a sample and applies a load to the sample; a probe joint provided at the other end of the probe; a load generator that generates a load in the axial direction; a load transmission shaft extending in the axial direction, one end of which is connected directly or indirectly to the load generator and the other end of which is provided with a connection joint, and which transmits the load of the load generator to the probe by connecting the connection joint to the probe joint; a displacement detector that detects a mechanical property of the sample by detecting a displacement of the probe in the axial direction; a heating furnace for heating the sample; In a thermal analysis apparatus comprising: one of the connection joint and the probe joint has a permanent magnet; an attraction member made of a soft magnetic material is provided at a position facing the permanent magnet in the other of the connection joint or the probe joint; A thermal analysis device characterized in that the connection joint and the probe joint can be connected by an attractive force based on a magnetic force between the permanent magnet and the soft magnetic material.

3. a probe extending in an axial direction, one end of which directly or indirectly contacts a sample and applies a load to the sample; a probe joint provided at the other end of the probe; a load generator that generates a load in the axial direction; a load transmission shaft extending in the axial direction, one end of which is connected directly or indirectly to the load generator and the other end of which is provided with a connection joint, and which transmits the load of the load generator to the probe by connecting the connection joint to the probe joint; a displacement detector that detects a mechanical property of the sample by detecting a displacement of the probe in the axial direction; a heating furnace for heating the sample; In a thermal analysis apparatus comprising: the connecting joint has an electromagnet; an attraction member made of a permanent magnet or a soft magnetic material is provided at a position facing the electromagnet in the probe joint; A thermal analysis device characterized in that the connection joint and the probe joint can be connected by an attractive force based on a magnetic force between the electromagnet and the permanent magnet or the soft magnetic material.

4. 3. The thermal analysis apparatus according to claim 1, wherein a magnetic shield member is provided along the axial direction between the connection joint and the load generator and the displacement detector.

5. 3. A thermal analysis apparatus according to claim 1, further comprising a connecting member for mechanically connecting said connection joint and said probe joint.

6. 3. A thermal analysis apparatus according to claim 1, wherein said probe is made of quartz glass or ceramic, and said probe joint is made of metal or alloy.

7. a probe extending in an axial direction, one end of which directly or indirectly contacts a sample and applies a load to the sample; a probe joint provided at the other end of the probe; a load generator that generates a load in the axial direction; a load transmission shaft extending in the axial direction, one end of which is connected directly or indirectly to the load generator and the other end of which is provided with a connection joint, and which transmits the load of the load generator to the probe by connecting the connection joint to the probe joint; a displacement detector that detects a mechanical property of the sample by detecting a displacement of the probe in the axial direction; a heating furnace for heating the sample; In a thermal analysis apparatus comprising: the connection joint has a blind hole for inserting the probe joint, and a plunger that protrudes retractably from the outside to an inner side of the blind hole along a radial direction intersecting the axial direction, a recess that is recessed in the radial direction is provided in a portion of the probe joint that faces the plunger, A thermal analysis device characterized in that the tip of the plunger is fitted into the recess, thereby enabling connection between the connection joint and the probe joint.

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