JPS582912A - Controlling method for temperature of material to be heated - Google Patents

Abstract

PURPOSE:To obtain the desired temperature rise characteristics even for fluctuation of the load, by controlling automatically either of the velocity of the hot blast and the temperature at least when the hot blast is blown to a material to be heated, which is transferred in a furnace along a prescribed transfer path, to heat this material. CONSTITUTION:A material (a) to be heated is moved in a prescribed speed from an inlet 5 to an outlet 6 by a transfer device 7 and is heated in a preheating zone 2, a heating zone 3, and a uniformly heating zone 4 in orde in accordance with the elapse of time. The temperature of the material (a) to be heated detected by a radiation thermometer 14 and atmospheric temperatures in respective furnaces detected by thermoscouple thermometers 18 and 19 are compared with each other and are operated in controllers 16 and 17. Respective openings of dampers 20-22 and a wind velocity corresponding to them are considered to control burner controlling motors 12 and 13 and dampers 20-22, thereby controlling either of the velocity of the hot blast for the material (a) to be heated and the temperature of the hot blast at least.

Description

[Detailed description of the invention] The present invention relates to a method for controlling an object to be heated.

When tempering steel springs, etc., the object to be heated is heated in a furnace while being moved by an appropriate transfer means, but the temperature rise characteristics of the object to be heated will vary depending on the type and number of objects to be heated. In order to avoid this, it is necessary to adjust the furnace atmosphere temperature YrI11 according to fluctuations in the load. be. Conventionally, temperature control like this has relied on manual operation by workers, making it difficult to adjust accurately:
Therefore, there were problems such as unstable quality and increased energy loss. In addition, there is a preheating zone in the furnace.
If multiple zones such as a heating zone and a soaking zone are provided, and the furnace atmosphere temperature is set in each zone according to the load, setting operations will become more troublesome in the case of high-mix, low-volume production where the load fluctuates significantly. However, it is difficult to achieve sufficient results.

On the other hand, in tempering Ise, the furnace atmosphere temperature is 550 to 2
Since the temperature is approximately 00°C, there is a large amount of heat transferred by radiation P'in convection, and it is more effective to improve the temperature increase characteristics by raising the air velocity tube for the heated material than by raising the temperature inside the furnace. For this reason, conventional methods have been to adjust the rotation speed of the furnace's ceiling fan, but since the appropriate furnace conditions cannot be determined, this also has to depend on the intuition of the operator, and it is difficult to ensure that the furnace is always in good condition. It was difficult to achieve results.

Furthermore, in tempering furnaces, etc., there are effects such as adhesion of water droplets and oil droplets due to hot water washing to the heated objects, fluctuations in furnace pressure due to changes in the amount of combustion air due to load fluctuations, and infiltration of outside air. Taking these factors into account and adjusting the furnace atmosphere temperature and wind speed according to load fluctuations,
Not only was this a huge burden on the workers, but it also made it difficult to improve the quality level.

The present invention was made under the above circumstances, and its 01 points are that stable quality can always be obtained regardless of load fluctuations, that energy can be depleted, and that the burden on workers is greatly reduced. The object of the present invention is to provide a method for controlling the temperature of a heated object, which can be easily controlled.

Hereinafter, the present invention will be explained with reference to the drawings. Joy 1
The figure shows an embodiment of nine apparatuses to which the present invention is applied.
is equipped with a preheating zone 2, a heating zone S, and a soaking zone 4, and is also provided with an appropriate transfer means 1 for transferring the object to be heated from at-population l toward the exit d. 9. The furnace body 1 is equipped with a 1st and a 2nd blower. 1. 2nd i+-su 1Oa
11 and 1st. Second burner control motor 12
．． 13 etc. are provided. The first blower 8 and the first burner 10 are configured to blow hot air onto the object to be heated a from a plurality of nozzles 14 provided in the preheating zone 2. The second blower 9 and the second burner 11 are capable of blowing hot air into the heating IF 3 and the soaking zone 4, respectively.

The furnace body 1 is provided with a radiation thermometer 14 that detects the temperature of the object to be heated near the boundary between the preheating zone 2 and the heating zone 3. 11Yt via the first and second controllers 16. If! guided by.

It was. The furnace body 1 includes a preheating chamber 2 and a heating chamber 111.
1! The first one that can detect the air temperature. 20th thermocouple thermometer II
I, 19 are provided), these thermometers 18.19
Each output signal is led to the controller 16 and IF, respectively. The output of the first controller 16 is output from the first dan/420 provided on the inlet side of the first blower 1 and the first/? - Guided by Nacontrol Mome 12. Further, the output of the second controller 11 is guided to the second damper 11 and the third damper 21 provided at each inlet of the heating IJ and the soaking 114, and
is guided by the burner control motor IJ.

Next, the operation of the nine-meter apparatus configured as described above will be explained. The object to be heated a (only one is shown in the figure) is moved by the transfer means 1 from the inlet i toward the outlet 6- at a predetermined speed, and as time t (see Fig. 2) passes, the object to be heated is transferred to the preheating zone 2.
, heating zone 3 and soaking zone 4. and,
The temperature of the heated object detected by the radiation thermometer 141g,
11j, the temperature of each furnace atmosphere that can be detected by the 20th thermocouple thermometers 1a, 1m, and the 1st. Each second controller 111
In 7.11, the burner control motor 11.11 and Danno 410.11 are compared, and if there is no required calculation t, taking into account each -1 of Danno 20.11.11 or the wind speed corresponding to these, etc. ．． I
By controlling the temperature, at least one of the speed and temperature of the hot air to the object to be heated is controlled.

According to the above configuration, the speed V and temperature Tbt of the hot air can be variably controlled in accordance with the temperature 'ra (see FIG. 2) K of the object to be heated a (see FIG. 2). That is, in FIG. 2, the broken line T, 2
If the temperature rise characteristic is low as shown in , for example, the wind speed v
As shown by the t-yield line v1, the hot air temperature Tbl can be increased by increasing p or when the load has increased.
By controlling the increase in temperature, the temperature increase characteristic can be improved as shown by Actual *Ta1. If the temperature increase characteristics are improved in this way, the soaking time can be shortened because the amount of tempering reaction increases, and therefore both the heating time and furnace length can be shortened, which reduces heat and saves energy. Consumption can be reduced. In addition, in Figure 2, iu
The wind speed v2 and temperature 'rbz indicated by i are the above temperature rise characteristics'
62K is shown. Since the above-mentioned control is performed automatically by detecting the temperature of the heated object-a, the quality level is significantly improved and stabilized compared to the case where it depends on the OJI. , and the burden on workers can be significantly reduced.

Note that the present invention is limited only to the above embodiments.
In addition to mourning and tempering furnaces, it can also be applied to various types of stone. (9) The heating means may be of an appropriate type different from those described in Section 10.11 of the above-mentioned children's room, and various other changes and applications can be made within the scope of the gist of the present invention.

As described above, when an object to be heated that is transferred in a furnace along a predetermined transfer path is heated by blowing hot air onto it, the hot air is By automatically controlling at least one of the temperature and temperature, the desired heating characteristics can be obtained even if the negative balance fluctuates, making it possible to stabilize the quality at a high level. The time and furnace length can be shortened, energy consumption can be reduced, and the burden on workers can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a system diagram illustrating a device to which the present invention is applied;
The figure is a diagram for explaining the operation on the same side. 1...Furnace body, 2...Pre-preparation zone, 3...Heating zone, 4
... Soaking zone, 2. Transportation means, 8. #...Blower, 10°11...14-t%12.13...Burner control motor, 14...Radiant temperature needle, 16. I
F... Adjustment needle, 11.11... Thermocouple temperature needle, 20
．． 21゜11... Danno etc., a... Heated object, ■...
...Wind speed, T, ...Temperature of heated object, Tb...Ambient temperature.

Claims (1)

[Claims] When heating an object to be heated that is transferred in a furnace along a predetermined transfer path by blowing hot air onto it,
ItK @ Automatically controls at least one of the speed and temperature of the hot air!
#Method of controlling the temperature of a heated object that is moldy.