JPS58103627A - Detection apparatus of temperature - Google Patents

Abstract

PURPOSE:To detect the accurate temperature and to prolong the life, by embedding a temperature detection element in a temperature detection plate making the face contacting with a billet as a plane surface and also, connecting the back of the temperature detection plate to a rod for support through a slender rod body. CONSTITUTION:The contact face (the front) of a billet 4 of a metallic disk- shaped temperature deection plate 11 of a temperature detection part 10 having high thermal conductivity, is formed in a flat board shape. A small diameter supporting bar 12 is provided projecting on its back and said bar 12 is connected to a rod 23 through a large diameter part 13. A thermocouple 15 is embedded in a hole 14 of the plate 11 provided in a diameter direction from the circumference face and the tip end of the thermocouple is brought into contact with the bottom face of the hole 14 and also, alumina powder etc. is filled in the hole 14 and the thermocouple 15 is fixed. A room 18 is provided between the back of the plate 11 and the part 13 and a response property for the temperature of the billet of the plate 11 is made good by a convection current of air. Hereby, the accurate temperature is detected and its life is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature detection device used in billet heaters and the like.

FIG. 1 shows a conventional temperature detection device for detecting the heating temperature of a metal billet in a billet heater that heats the metal billet by inserting it into an induction coil.

As shown in FIG. 2, a heating pair of alumel element 1 and chromel element 2 are installed on a predetermined moving table 3, and the tips of the alumel element 1 and chromel element 2 are pressed against the detection surface of billet 4 during heating. It is configured to detect the temperature of the billet. In this type of device, in order to accurately detect the billet temperature, the tip of each element 1.2 is made sharp and pressed against the billet 4 with strong force, so that the tip of each element bites into the billet 4. was. However, due to the high temperature of the billet and the fact that it is pressed against the billet with a strong force, the tip tends to wear out and become rounded, which makes it difficult to properly detect the temperature.

This invention was made in order to eliminate the above-mentioned drawbacks, and an electrical temperature detection element is embedded in a temperature detection plate whose contact surface with the billet is flat, and the temperature detection plate is placed on the opposite side of the billet contact surface. By connecting the surface to the support rod through a thin rod, it prevents wear of the contact part with the billet, and efficiently applies the ceret temperature to the temperature sensor to obtain accurate temperature. It is an object of the present invention to provide a temperature detection device that can detect temperature and has a long life.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, reference numeral 3 denotes a movable stage configured similarly to a conventional billet heater temperature detection device, and this movable stage 3 is used to detect the billet 4 inserted into the induction heating coil (not shown) of the billet heater. It is provided so that it can move toward the rear end surface.

Reference numeral 10 denotes a temperature detection section, which is fixed to the billet-side tip of a rod 23 inserted into a through hole 22 of a support mechanism 21 fixed to the lower surface of the movable table 3 so as to be movable as a piston. The rod 23 is always urged toward the billet 4 by a spring inserted through the rod 23 within the support mechanism 21.

5 and 6 show the detailed structure of the temperature detection unit 10, in which the front surface of the temperature detection plate 11 formed in a thin disk shape and made of a metal with high thermal conductivity, that is, the billet 4 The contact surface with the rear end surface is formed in a flat plate shape with a predetermined width, and heat from the temperature detection plate 11 is removed from the rear surface of the temperature detection plate 11, that is, the surface opposite to the surface facing the billet 4. A small-diameter support bar 12 is protruded to prevent conduction, and the temperature detection plate 11
is connected to the rod 2.3 via a support bar 12 and a large diameter portion 13 formed to have a larger diameter than the rod 23.

A thermocouple 15 made of an alumel-chromel element is embedded in a hole 14 bored diametrically from the circumferential surface of the temperature detection plate 11 described above. While contacting the bottom surface, the hole 14 is filled with a high thermal conductivity material such as alumina powder, and a thermocouple 15 is fixed.

Furthermore, a cylindrical cap 16 is removably fitted to the large diameter portion 13 via a screw portion 17 from the temperature detection plate 11 to the large diameter portion 13. A chamber 18 is formed between the diameter portion 13 and the diameter portion 13 . This room 18
By providing this, air convection occurs within the chamber 18, thereby improving the responsiveness of the temperature detection plate 11 to the billet temperature.

In the temperature detection device configured as described above, the movable table 3
When the billet 4 is moved toward the bit 4 side, the front surface of the temperature detection plate 11 of the temperature detection portion 10Δ is elastically pressed against the rear surface of the billet 4 by the repulsive force of the spring 24.

When the billet 4 is heated by a known billet heater, the heat of the billet 4 is transferred to the temperature detection plate 11 and further transferred to the thermocouple 15, from which a signal representing the billet temperature is obtained.

In this case, since the contact surface of the temperature detection plate 11 with the billet 4 is a flat surface, the wear of the contact surface of the detection plate 11 is reduced. Furthermore, since the temperature detection plate 11 is connected to the rod 23 via the thin support bar 12, the heat of the temperature detection plate 11 is prevented from flowing to the rod 23, and accurate temperature can be detected. The temperature detection speed can be increased by reducing the heat capacity of the detection plate 11.

Note that the temperature detection device of the present invention is not limited to one using a thermocouple, and generates a temperature detection signal electrically. It can also be applied to misters and other temperature detection elements.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional temperature detection device for a billet heater, FIG. 2 is a plan view of the device shown in FIG. 1, FIG. 3 is a sectional view showing an embodiment of the present invention, and FIG. 3 is a plan view of the embodiment shown in FIG. 3, FIG. 5 is an enlarged view of the temperature detection section of the embodiment shown in FIG. 3, and FIG. 6 is a sectional view of FIG. 5. 3... Moving table, 4... Billet, 10... Temperature detection section, 11... Temperature detection plate, 12... Support bar, 1
3... Large diameter part, 14... Hole, 15... Thermocouple, 1
6... Cap, 17... Screw part, 18... Chamber,
21...Support mechanism, 22...Through hole, 23...Rod, 24...Spring Patent applicant: Fuji Electric Manufacturing Co., Ltd. Representative Patent Attorney Aoyama, 2 people, 1st cause, 3rd cause, 5th Figure 6

Claims (1)

[Claims] (1) An electrical temperature detection element is embedded in a temperature detection plate whose contact surface with the billet whose temperature is to be measured is formed into a flat surface of a predetermined area, and from the surface of the temperature detection plate opposite to the surface facing the billet. A temperature detection device characterized in that the temperature detection plate is fixed to a suitable support rod via a protruding support bar.