Page 60 - 《橡塑技术与装备》英文版2026年3期

HINA R&P TECHNOLOGY AND EQUIPMENT

The power distribution for electric heating of the mold 3 Comparison of cost consumption
sleeve can be referenced from that of the hot plate. Since the between steam heating and electric
heating area of the pattern block corresponding to the mold heating
sleeve is the tread rubber, the power should be amplified by The cost advantages of electric heating curing presses and
1.5 times, that is, 7.2X1.5=10.2 kW. At the same time, due steam heating curing presses (energy saving and consumption
to uneven temperature distribution during vulcanization of reduction), calculated based on an annual production of 1
the tire sidewall, under-vulcanization often occurs, so power million sets, are shown in Table 7.
distribution should be emphasized on the upper and lower parts Calculated on a per-tire basis
of the mold sleeve. Taking the semi-steel 51" tire as an example:
In summary, the power distribution of the electric heating With an average vulcanization time of 15 minutes, each
vulcanization chamber is as follows, as shown in figure 5. tire consumes 18 kg of steam, and each ton of steam is priced
at 220 yuan:
The steam consumption cost for one unit of curing press
in one year is: (60/15)×2×24×300×18×0.22 = 228,096 yuan;
If estimated based on a 40% energy saving: 1 unit of
curing press saves: 228,096×0.4=91,238.4 yuan per year
1—Upper hot plate electric heating power: 7.2 kW;
2—Capsule internal temperature: 18.69 kW (according to Plan A); 1.25 kW
(according to Plan B); 4 Focus points of electric heating
3—Mold sleeve electric heating: 10.2 kW; technology and steam heating technology
4—Lower hot plate electric heating power: 7.2 kW Whether it's electric heating technology, steam heating
Figure 5 Power distribution diagram of electric heating
vulcanization chamber technology, or other heating technologies, as long as the
External temperature power: P 1 =7.2+7.2+10.2=24.6 kW; components required for tire vulcanization remain unchanged,
Internal heating power: P2=1.25 kW (in power-saving the key points to focus on during vulcanization are common.
mode, execute as per Plan B, 1.25 kW); a. The temperature difference between the upper and lower
Theoretical total power ： P theory =P 1 =7.2+7.2+10.2=24.6 heating plates should be ±2℃; b. The temperature difference
kW ； of a single heating plate should be ±2℃; c. The time for
The power loss is calculated based on 30%, assuming a heating from 10℃ to 200℃ should be quickly controllable; d.
range of 10%-30%; The internal temperature drop from 200℃ to 20℃ should be
Actual total powerP actual =(1+30%)P throry =33.6 kW completed in a short period of time, as shown in figure 6.
Temperature control scheme: After all, steam heating technology has undergone more
External temperature: Preheat for 1.5~2 hours. After than 50 years of development. Both domestic and foreign
reaching the process temperature, the temperature drops by 2℃, curing press manufacturers have been continuously absorbing
and automatic heating compensation is performed; and improving upon advanced technologies from others.
Internal temperature: Preheat externally with nitrogen, The technology has become highly refined and mature, with
reach process temperature within 10 minutes, recycle nitrogen, extensive experience in temperature control, fully capable of
and reduce normal operating power by 50%. meeting the requirements of tire manufacturing processes. In
2.2.2.3 Implementation plan for electric contrast, electric heating technology has only just begun to take
heating vulcanization power and energy off in recent years, both domestically and internationally, and
consumption is still in the exploratory stage. Most have not achieved mass
The implementation plan for the power and energy production, and there are still shortcomings in temperature
consumption of electric heating vulcanization is detailed in control. Qingdao MESNAC Electromechanical Engineering
Table 6. Co., Ltd. is at the forefront of domestic curing press

·14· Vol.52，No.3