CN-122015456-A - Heated air circulation drying oven and control method thereof

CN122015456ACN 122015456 ACN122015456 ACN 122015456ACN-122015456-A

Abstract

The invention discloses a hot air circulation drying oven and a control method thereof, and relates to the technical field of hot air circulation drying, wherein the hot air circulation drying oven comprises an oven body, a heating circulation device and a stretching and turning-back device, a drying cavity is formed in the oven body, and a yarn inlet and a yarn outlet are formed at two ends of the drying cavity; the heating circulation device is arranged on the oven and is communicated with the drying cavity, and the heating circulation device carries out heating circulation on the drying cavity; the stretching and turning-back device is at least provided with two groups, the two groups of stretching and turning-back devices are arranged at the two ends of the drying cavity, and the stretching and turning-back device stretches and turns back the silk thread, so that the silk thread is positioned in the drying cavity, and the hot air circulation drying oven can realize uniform distribution and efficient utilization of hot air and can realize precise control of technological parameters.

Inventors

SHEN RUI
HUANG RONGHAI
FAN XINYA
WANG JIAN
WU SHANGMING
CHEN SUO

Assignees

安徽皖维高新材料股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260318

Claims (10)

1. A heated air circulation drying oven comprising: the novel silk dryer comprises a drying oven body (100), wherein a drying cavity (110) is formed in the drying oven body (100), and silk inlets (120) and silk outlets (130) are formed in two end positions of the drying cavity (110); the heating circulation device (200) is arranged on the oven, the heating circulation device (200) is communicated with the drying cavity (110), and the heating circulation device (200) is used for performing heating circulation on the drying cavity (110); The stretching and turning-back devices (300) are at least provided with two groups, the two groups of stretching and turning-back devices (300) are arranged at two ends of the drying cavity (110), and the stretching and turning-back devices (300) stretch and turn back the silk thread, so that the silk thread is positioned in the drying cavity (110).
2. The hot air circulation drying oven according to claim 1, wherein the heating circulation device (200) comprises a high-temperature fan (210), an electric heating box body (220) and electric heating pipes (230), the high-temperature fan (210) is installed at the top of the oven body (100), the electric heating box body (220) is communicated with an air inlet of the high-temperature fan (210), the electric heating pipes (230) are provided with a plurality of electric heating pipes (230), and the electric heating pipes (230) are all installed in the electric heating box body (220).
3. The hot air circulation drying oven according to claim 1, wherein the upper top and the lower bottom of the drying cavity (110) are respectively provided with an air supply chamber (140), the upper top, the lower bottom and the rear side of the drying cavity (110) are respectively provided with a circulation air duct (150), and the circulation air duct (150) is communicated with an air outlet of the high-temperature fan (210) and a return air pipeline of the electric heating box (220) to form a circulation loop.
4. A hot air circulation drying oven according to claim 1, characterized in that the oven body (100) is further provided with an air exhaust assembly (400), the air exhaust assembly (400) comprising: the air outlet (410) is formed in the rear side of the oven body (100) and is communicated with the drying cavity (110), and three air outlets (410) are formed; The exhaust pipes (420) are connected with the exhaust outlets (410) in a one-to-one correspondence manner; and the air quantity regulating valve (430) is arranged on the exhaust pipe (420).
5. The hot air circulation drying oven according to claim 1, wherein the oven body (100) is further provided with a temperature control assembly, the temperature control assembly comprises a main control temperature sensor and an overtemperature protection temperature sensor, the main control temperature sensor is installed in the drying cavity (110), and the overtemperature protection temperature sensor is installed in an electric heating box (220) of the heating circulation device (200).
6. A control method performed by a hot air circulation drying oven according to any one of claims 1 to 5, characterized in that the control method comprises: Setting two hot air circulation drying ovens, wherein the two hot air circulation drying ovens are in front-back butt joint, so that one yarn inlet is aligned with a yarn outlet at an adjacent position; Step two, fiber tows are led into a first section of hot air circulation drying oven through the yarn inlet, the temperature of a drying cavity, the power of a heater and the frequency of a circulating fan are controlled, and the fiber tows are wound for a plurality of circles in the drying cavity to be primarily dried; Step three, the fiber tows after primary drying are led into a second section of hot air circulation drying oven, the temperature of a drying cavity, the power of a heater and the frequency of a circulating fan are controlled, and the fiber tows are wound for a plurality of circles in the drying cavity to be dried for the second time; controlling the relative humidity in the drying cavity by adjusting air quantity adjusting valves on the exhaust pipes of the first section and the second section of the hot air circulation drying oven; And fifthly, monitoring the surface temperature and the moisture content of tows at the filament outlets of the two sections of drying cavities in real time, dynamically adjusting the power of a heater, the frequency of a fan and the opening degree of a moisture discharging air valve, so that the moisture content of the tows at the filament outlet of the second section of hot air circulation drying oven is reduced to 18% -22%, the surface temperature of the tows at the filament outlet of the first section of hot air circulation drying oven is stabilized at 58 ℃ -63 ℃, and the surface temperature of the tows at the filament outlet of the second section of drying oven is stabilized at 68 ℃ -73 ℃.
7. The control method according to claim 6, wherein in the first section of hot air circulation drying oven, the temperature of the drying cavity is 140-160 ℃, the power of the heater is 75-100% of rated power, and the frequency conversion frequency of the circulating fan is 40-50 Hz.
8. The control method according to claim 6, wherein in the second section of the hot air circulation drying oven, the temperature of the drying cavity is 150-170 ℃, the power of the heater is 70-90% of the rated power, and the variable frequency of the circulating fan is 40-50 Hz.
9. A control method according to claim 6, characterized in that the fibre tows are wound 4-5 turns in the hot air circulation drying oven.
10. The control method according to claim 6, wherein in the fourth step, the humidity inside the oven in the first section and the second section is maintained in a range of 10% -25% relative humidity.

Description

Heated air circulation drying oven and control method thereof Technical Field The invention relates to the technical field of hot air circulation drying, in particular to a hot air circulation drying oven and a control method thereof. Background In the production process of high-strength high-modulus polyvinyl alcohol (PVA) fibers, a drying link is a crucial step, and the drying effect directly influences the quality, performance and production efficiency of the final product. The high-strength high-modulus PVA fiber has excellent performances of high strength, high modulus, corrosion resistance and the like, and is widely applied to a plurality of high-end fields such as aerospace, building reinforcement, protective materials and the like, so that the requirements on various process indexes in the production process are very strict, and the drying link is not exceptional. At present, in the field of PVA fiber drying, a common drying mode has a plurality of limitations. The traditional drying equipment adopts a quartz tube heating mode to dry, and the drying mode has obvious defects. On the other hand, the temperature distribution is not uniform, and local too high or too low temperature regions are easily formed in the oven. The local temperature is too high to cause the PVA fiber to be sticky and form doubling, so that not only the dispersibility of the fiber is affected, but also the physical properties of the fiber are damaged, the strength and the modulus are reduced, and the local temperature is too low to effectively remove the moisture in the fiber, so that the drying is not thorough, and the hot stretching of the fiber is affected. On the other hand, the traditional drying equipment has lower heat efficiency, and a large amount of heat is dissipated into the surrounding environment in the drying process, so that not only is the energy wasted and the production cost increased, but also the traditional drying equipment does not conform to the current development concepts of energy conservation, emission reduction and green production. In addition, the existing drying equipment is difficult to realize accurate control of drying process parameters in the drying process, and the temperature is easy to fluctuate. The drying process of PVA fiber is a complex physical and chemical process, and is affected by temperature, humidity, wind speed, drying time and other factors. Different production batches, different specifications of PVA fibers may require different drying process parameters to ensure drying quality. However, conventional drying equipment often lacks an advanced control system, cannot adjust drying parameters in real time according to actual conditions, and is difficult to meet the requirements of diversified production, so that the quality of products is unstable, and the difference between batches is large. With the continuous expansion of the application field of the high-strength high-modulus PVA fiber and the increasing market demand, the related industry puts higher demands on the quality and the production efficiency of the PVA fiber. Therefore, research and development of novel drying equipment capable of solving the problems, realizing uniform distribution of hot air, improving heat efficiency and accurately controlling drying process parameters has important practical significance for improving the production level and market competitiveness of high-strength high-modulus PVA fibers. Disclosure of Invention The invention provides a hot air circulation drying oven and a control method thereof, which can realize uniform distribution and efficient utilization of hot air and can realize precise control of technological parameters. In order to solve the above problems, the present invention provides a hot air circulation drying oven, comprising: the drying device comprises a drying oven body, wherein a drying cavity is formed in the drying oven body, and a wire inlet and a wire outlet are formed at two ends of the drying cavity; The heating circulation device is arranged on the oven and communicated with the drying cavity, and is used for heating and circulating the drying cavity; The stretching and turning-back device is at least provided with two groups, the two groups of stretching and turning-back devices are arranged at two ends of the drying cavity, and the stretching and turning-back device stretches and turns back the silk thread, so that the silk thread is positioned in the drying cavity. Compared with the prior art, the hot air circulation drying oven provided by the invention has the following beneficial effects: The hot air circulation drying oven realizes uniform circulation of hot air in the drying cavity through the heating circulation device, ensures that silk threads are heated consistently and high in drying efficiency, simultaneously utilizes at least two groups of stretching and turning-back devices to enable the silk threads to turn back and run repeatedly in the dryin