JP2720703B2 - Contact temperature detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact type temperature detector useful for measuring a temperature by contacting a surface of an object to be measured. In particular, even when the measurement point of the DUT is greatly deformed during heating, such as a flat plate or long material, and the relative distance between the holding position of the detector body and the DUT is not constant, the change in that case is absorbed. The present invention relates to the provision of this type of temperature detector capable of detecting a desired temperature.

[0002]

2. Description of the Related Art A contact-type temperature detector is of a fixed type when the temperature of an object to be measured is small, but is held when a measurement point is largely deformed. The structure is such that the relative distance between the position to be detected and the detection unit can be changed.

FIG. 2 shows an example of a contact plate type temperature detector.
It has a contact plate 1 that comes into contact with the surface of the device under test 4, a spring 2 that holds the device from the inside, and a thermocouple 3 attached to the center of the inside of the plate. Has been devised to be deformed accordingly. Reference numeral 9 denotes a holder holding the metal sheath of the compensating lead wire 10.

FIG. 3 shows an example of a detector provided with a spring. A thermocouple 3 serving as a detection unit is attached to the tip of a metal sheath 8 of a compensating lead wire 10, and a stop ring 5 and a slide ring 7 are attached to the metal sheath 8. A spring 6 is provided between the two rings, and a holder 9 is slidably inserted into the metal sheath 8 so that the slide ring 7 is linked. With the holder 9 linked to the sliding ring 7, the thermocouple 3 as a detecting portion can contact the surface of the object to be measured, and if the object to be measured is deformed, that is, the thermocouple 3 rises to the temperature detector side. In such a case, the metal sheath 8 moves in the axial direction and slides relative to the holder 9, and the change in the relative distance between the holder and the thermocouple 3 in this case is absorbed by the compression deformation of the spring 6. is there.

[0005]

In the contact plate type temperature detector shown in FIG. 2, the contact plate slides on the measured object when the measured object moves in a direction perpendicular to the pressing direction of the contact plate. However, since the spring is short for displacement in the pressing direction, it can be absorbed only up to a few mm.

In the temperature detector with spring shown in FIG. 3, the length of the spring can be increased, and sufficient displacement can be absorbed with respect to displacement in the pressing direction. However, a possibility that the distance from the holder to the detection portion is increased, the detection unit is dragged by the object to be measured when moving in the direction perpendicular to the pressing direction an object to be measured by heating, resulting in bent metal sheath was there. Furthermore, when the holder is combined with an air cylinder and pressed periodically to measure the temperature, the distance to the detecting unit, that is, the measuring point, is large, so that the detecting unit cannot be brought into contact with the predetermined measuring point, and Is small, it is difficult to make contact with the detection unit.

In view of the above-mentioned problems of the prior art, the present invention makes it possible to make a predetermined pressing contact by adapting to a large deformation of an object to be measured without difficulty, and to provide excellent reproducibility without fear of damage. The purpose of the present invention is to provide a contact type temperature detector.

The contact-type temperature detector provided by the present invention has a detecting portion for contacting the surface of an object to be measured at a tip thereof and a metal sheath which is relayed to a compensating conductor, which is located close to the detecting portion side of the metal sheath. And a spring and a slide ring connected to the stop ring are provided, and a cylindrical capsule having a bottom is inserted through the metal sheath so as to be movable in the axial direction. conjunction from the axial direction to the metal sheath via the spring and stop ring by contacting the ring and housing a spring and sliding ring and sliding on the ring, close the capsule with the workpiece side of its And hold it with the holder in the air cylinder.
It is connected to a rod .

[0009]

FIG. 1 shows an embodiment of a contact temperature detector according to the present invention.

[0010] compensating cable 10 to contact FIG outside thermometer, the metal sheath 8 is attached to relay signals to the tip of its, thermocouple 3 as a detection portion is attached. The thermocouple 3 has a dish-shaped contact surface with the object to be measured 4 to facilitate sliding.

A stop ring 5 is fixed to the metal sheath 8 at a position close to the detection unit side, and a coil spring-like spring 6 and a slide ring 7 are sequentially linked to the stop ring 5.

Reference numeral 11 denotes a bottomed cylindrical capsule which is slidably inserted through the metal sheath 8 and accommodates the stop ring 5, the spring 6 and the sliding ring 7 from the sliding ring 7 side. Is attached by screwing. The distal end side of the capsule 11 is tapered to ensure the guide of the metal sheath, so that the thermocouple 3 serving as the detection unit can be easily positioned.

The capsule 11 is axially linked to the metal sheath 8 via the spring 6 and the stop ring 5 by bringing the sliding ring into contact with the cap 12.

The capsule 11 is held by the holder 9 at a position close to the measured object 4.

In order to raise and lower the above-described temperature detector on the object 4 to be measured, a rod of an air cylinder (not shown) may be connected to the holder 9 and an electromagnetic valve or a manual valve may be operated. .

Now, in the state shown in FIG. 1, that is, in a state where the holder 9 is lowered while pressing the slide ring 7 with the cap 12 of the capsule 11 and the thermocouple 3 is pressed against the surface of the object 4 to be contacted, When the tube 4 rises to the detector side, the thermocouple 3 and the metal sheath 8 serving as the detection unit are pushed up. If the position of the holder 9 is not changed at that time, the sliding ring 7 is pressed against the cap 12 of the capsule. The spring 6 is compressed by the push-up of the stop ring 5 to move relative to the metal sheath 8, thereby absorbing the protruding portion of the object to be measured without changing the position of the holder, thereby making the predetermined contact type. Provide for temperature detection.

Since the holder 9 is mounted close to the object 4 to be measured, even if the length of the capsule 11 and the length of the spring 6 are increased, the holder 9 can be brought into contact with an accurate position without greatly changing the contact point. Even if the pair slides due to thermal expansion and contraction of the DUT 4 in a contact state, the metal sheath 8 does not bend. In addition, by increasing the length of the spring, a large displacement can be absorbed.

[0018]

According to the contact-type temperature detector of the present invention as described above, the relative distance between the holder and the detecting portion is small, so that the detecting portion slides when the object to be measured thermally expands and contracts. Even if the metal sheath is not bent, the positioning is reproducible even when the holder is reciprocated and the temperature is measured by intermittent contact. Even if the capsule and the spring are lengthened, it is possible to cope with a large deformation of the measurement point of the object to be measured without increasing the relative distance between the holder and the detection unit and without changing the position of the holder. Compared with the conventional type, it can be made more compact, the structure can be simplified, and the number of failures can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional explanatory view showing one embodiment of a contact-type temperature detector of the present invention.

FIG. 2 is an explanatory view showing an example of a conventional contact temperature detector.

FIG. 3 is an explanatory diagram showing another example of a conventional contact temperature detector.

[Explanation of symbols]

 Reference Signs List 3 Thermocouple (detection unit) 4 DUT 5 Stop ring 6 Spring 7 Sliding ring 8 Metal sheath 9 Holder 10 Compensating lead wire 11 Capsule 12 Cap of capsule

Claims (1)

(57) [Claims] 1. A stop ring is fixedly attached to a metal sheath which is connected to a compensating lead wire at a position close to the detection portion side of the metal sheath and has a detection portion which is brought into contact with the surface of an object to be measured at the tip. A spring and a sliding ring are provided on the ring, and a bottomed cylindrical capsule is inserted through the metal sheath so as to be movable in the axial direction. The capsule accommodates the stop ring, the spring and the sliding ring. and through the spring and stop ring in cooperation from the axial direction to the metal sheath by contacting on the sliding ring, the holder held by the holder at a position near the capsule DUT side of its Aashi
A contact-type temperature detector connected to a rod of a cylinder .