Automatic constant-temperature control system for drying roller in carbon fiber production and use method of automatic constant-temperature control system

Abstract

The invention discloses a carbon fiber production drying roller automatic constant temperature control system and a use method. The system comprises a heat conduction oil storage tank, a circulation loop constant temperature system and a heat conduction oil control cabinet. The circulation loop constant-temperature system comprises low-temperature, medium-temperature and high-temperature circulation loop constant-temperature systems; the heat conduction oil storage tank is connected with the high-temperature circulation loop constant-temperature system, the low-temperature circulation loop constant-temperature system and the medium-temperature circulation loop constant-temperature system are connected into a loop of the high-temperature circulation loop constant-temperature system, the low-temperature circulation loop constant-temperature system and the medium-temperature circulation loop constant-temperature system are used for washing and drying, and the high-temperature circulation loop constant-temperature system is used for sizing and drying; the heat conduction oil control cabinet communicates with the circulation loop constant-temperature system and is used for achieving automatic constant-temperature control over the drying rollers. Compared with the prior art, by arranging the circulation loop constant-temperature systems with different temperatures, it is guaranteed that the surface temperature of the drying roller reaches the constant-temperature effect, the tow drying effect is guaranteed, constant-temperature control over the fiber drying process is achieved, and the carbon fiber performance is stabilized.

Description

Technical Field

[0001] The present invention belongs to the field of carbon fiber production control, and particularly relates to an automatic constant temperature control system and a usage method for a drying roller in carbon fiber production. Background Art

[0002] Since the drying after fiber sizing is to evaporate the moisture in the filaments after sizing, keep the tow dry, form a film of resin on the fiber surface, endow the tow with a certain degree of bundling property, increase the surface gloss and lubrication of the filaments, maintain good stiffness, and reduce hairiness.

[0003] Currently, during the pre-oxidation process, the drying before and after the fiber tow is impregnated with glue is carried out by steam heating the drying roller, and the residual moisture is dried with the surface temperature of the roller. Affected by the drainage effect of the steam trap, the temperature control accuracy of the steam drying roller is low, and the surface temperature of the drying roller cannot reach the constant temperature effect, which has a certain impact on fiber hairiness; uneven drying of the tow before impregnation will also cause uneven glue content in the carbon fiber, affecting the use in downstream fields. At the same time, limited by the fact that the steam pressure rises rapidly with the increase of temperature, the temperature of the roller cannot be too high, and there is a safety risk at too high pressure. With the national restrictions on the use of boilers, the number of steam heating rollers is rapidly decreasing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide an automatic constant temperature control system and a usage method for a drying roller in carbon fiber production, which solves the problem that the surface temperature of the drying roller in the prior art cannot reach the constant temperature effect and affects fiber hairiness.

[0005] The present invention adopts the following technical solutions to solve the above technical problems: an automatic constant temperature control system for a drying roller in carbon fiber production, including a heat transfer oil storage tank, a circulating loop constant temperature system, and a heat transfer oil control cabinet; the circulating loop constant temperature system includes a low-temperature circulating loop constant temperature system, a medium-temperature circulating loop constant temperature system, and a high-temperature circulating loop constant temperature system; the heat transfer oil storage tank is connected to the high-temperature circulating loop constant temperature system, the low-temperature circulating loop constant temperature system and the medium-temperature circulating loop constant temperature system are connected to the high-temperature circulating loop constant temperature system circuit, the low-temperature circulating loop constant temperature system and the medium-temperature circulating loop constant temperature system are used for washing and drying, and the high-temperature circulating loop constant temperature system is used for sizing and drying; the heat transfer oil control cabinet is connected to the circulating loop constant temperature system, is used to receive the signal transmitted by the temperature transmitter, monitor the temperature of the drying roller in real time, and set the temperatures of the drying cylinders in the low-temperature, medium-temperature, and high-temperature circulating loops according to the actual production requirements.

[0006] The high-temperature circulation loop constant temperature system includes: a high-temperature circulation pump assembly, a heat transfer oil heater, a sizing and drying roller, a first temperature transmitter, and a first temperature sensor;

[0007] One end of the high-temperature circulation pump assembly is connected to the heat-conducting oil storage tank, and the other end is connected to the oil inlet end of the heat-conducting oil heater; the oil outlet end of the heat-conducting oil heater is connected to the sizing and drying roller. A first temperature sensor is arranged inside the sizing and drying roller for collecting the temperature data of the sizing and drying roller in real time; the first temperature sensor, the first temperature transmitter, the temperature controller in the heat-conducting oil heater, and the heat-conducting oil control cabinet are connected by signals. The heat-conducting oil control cabinet completes the operation of the high-temperature circulation loop by receiving information and giving feedback.

[0008] The high-temperature circulation pump assembly is used to transport the heat-conducting oil to the heat-conducting oil heater, and includes a first high-temperature circulation pump, a second high-temperature circulation pump, a filter, and a gate valve; the first high-temperature circulation pump and the second high-temperature circulation pump are connected in parallel through the filter and the gate valve.

[0009] The medium-temperature circulation loop constant-temperature system includes: a pneumatic control valve three-valve group, a medium-temperature circulation pump assembly, a water-washing and drying roller II, a second temperature transmitter, and a second temperature sensor;

[0010] One end of the pneumatic control valve three-valve group A is connected to the high-temperature circulation loop, one end is connected to the oil inlet end of the medium-temperature circulation pump assembly, and the other end is connected to the oil outlet end of the water-washing and drying roller II; the oil outlet end of the medium-temperature circulation pump assembly is connected to the oil inlet end of the water-washing and drying roller II. A second temperature sensor is arranged inside the water-washing and drying roller II for collecting the temperature data of the drying roller II in real time; the second temperature sensor, the second temperature transmitter, the pneumatic control valve three-valve group, and the heat-conducting oil control cabinet are connected by signals. The heat-conducting oil control cabinet completes the operation of the medium-temperature loop by receiving information and giving feedback.

[0011] The medium-temperature circulation pump assembly is used to send the heat-conducting oil to the water-washing and drying roller II, and includes a first medium-temperature circulation pump, a second medium-temperature circulation pump, a filter, and a gate valve; the first medium-temperature circulation pump and the second medium-temperature circulation pump are connected in parallel through the filter and the gate valve.

[0012] The low-temperature circulation loop constant-temperature system includes: a pneumatic control valve three-valve group, a low-temperature circulation pump assembly, a water-washing and drying roller I, a third temperature transmitter, and a third temperature sensor;

[0013] One end of the pneumatic control valve three-valve group is connected to the high-temperature circulation loop, one end is connected to the oil inlet end of the low-temperature circulation pump assembly, and the other end is connected to the oil outlet end of the water-washing and drying roller I; the oil outlet end of the low-temperature circulation pump assembly is connected to the oil inlet end of the water-washing and drying roller I. A third temperature sensor is arranged inside the water-washing and drying roller I for collecting the temperature data of the drying roller I in real time; the third temperature sensor, the third temperature transmitter, the pneumatic control valve three-valve group, and the heat-conducting oil control cabinet are connected by signals. The heat-conducting oil control cabinet completes the operation of the low-temperature loop by receiving information and giving feedback.

[0014] The low-temperature circulation pump assembly includes a first low-temperature circulation pump, a first low-temperature circulation pump, a filter, and a gate valve; the first low-temperature circulation pump and the first low-temperature circulation pump are connected in parallel through the filter and the gate valve.

[0015] A method of using an automatic constant temperature control system for a drying roller in carbon fiber production, the specific steps are as follows:

[0016] Step 1: Inject heat-conducting oil into the heat-conducting oil storage tank with an oil injection pump, and open the respective circuits of the low-temperature, medium-temperature, and high-temperature circulation pumps to start circulating;

[0017] Step 2: Set the constant temperature of the drying roller in the low-temperature circulation loop constant temperature system, medium-temperature circulation loop constant temperature system, and high-temperature circulation loop constant temperature system in the heat-conducting oil control cabinet, and the heat-conducting oil heater starts to heat up until the temperature of the sizing drying roller reaches the constant temperature of the sizing drying roller in the high-temperature circulation loop constant temperature system;

[0018] Step 3: In the high-temperature circulation loop constant temperature system, the first temperature sensor continuously collects the temperature data of the sizing drying roller and transmits it to the processor of the heat-conducting oil control cabinet through the first temperature transmitter;

[0019] The processor of the heat-conducting oil control cabinet compares the received temperature data with the preset constant temperature value of the sizing drying roller. If the temperature is lower than the constant temperature value, the processor increases the power of the heat-conducting oil heater through the drive circuit to increase the heating intensity and raise the temperature; if the temperature is higher than the constant temperature value, the processor reduces the power of the heat-conducting oil heater to reduce the heat supply and lower the temperature; the processor continuously cycles through the comparison and adjustment to achieve the automatic constant temperature control of the drying roller;

[0020] Step 4: In the medium-temperature circulation loop constant temperature system, the second temperature sensor continuously collects the temperature data of the second water-washing drying roller and transmits it to the processor of the heat-conducting oil control cabinet through the second temperature transmitter; the processor compares the received temperature data with the preset constant temperature value of the second water-washing drying roller. If the temperature is lower than the constant temperature value, the processor supplements the high-temperature heat-conducting oil in the high-temperature circulation loop into the medium-temperature circulation loop through the pneumatic regulating valve three-valve group to raise the temperature; the processor continuously cycles through the above comparison and adjustment to achieve the automatic constant temperature control of the drying roller;

[0021] Step 5: In the low-temperature circulation loop constant temperature system, the third temperature sensor continuously collects the temperature data of the first water-washing drying roller and transmits it to the processor of the heat-conducting oil control cabinet through the third temperature transmitter; the processor compares the received temperature data with the preset constant temperature value. If the temperature is lower than the constant temperature value, the processor supplements the high-temperature heat-conducting oil in the high-temperature circulation loop into the low-temperature circulation loop through the pneumatic regulating valve three-valve group to raise the temperature; the processor continuously cycles through the above comparison and adjustment to achieve the automatic constant temperature control of the drying roller.

[0022] Step 6: Repeat Steps 1 to 5 until the drying roller operates at a constant temperature.

[0023] The constant temperature setting values of the drying rollers in the low-temperature circulation loop constant temperature system, medium-temperature circulation loop constant temperature system, and high-temperature circulation loop constant temperature system of the heat transfer oil control cabinet are set to 80°C, 100°C, and 140°C respectively.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention can monitor and collect the temperature of the drying roller in real time through a temperature sensor, eliminating the need for manual measurement and improving timeliness, thus enhancing the automation level of on-site operations.

[0026] 2. The present invention sets up three different circulation loop constant temperature systems corresponding to the three different temperatures required for drying the carbon fiber production and manufacturing drying rollers, namely the low-temperature water-washing drying roller 1, medium-temperature water-washing and mixing drying roller 2, and high-temperature sizing drying roller. The three circulation loops correspond to their respective temperatures, and the fixed temperature required for production is achieved through repeated cycling.

[0027] 3. The circulation loop constant temperature systems at different temperatures of the present invention ensure that the surface temperature of the drying roller reaches a constant temperature effect, guarantee the drying effect of the tow, achieve constant temperature control during the fiber drying process, and stabilize the performance of the carbon fiber.

[0028] 4. Each circulation loop constant temperature system of the present invention is provided with two parallel sets of circulation pumps, one for standby. When one circulation pump fails, the other standby pump can be enabled, and the circulation loop can operate normally without affecting production. Moreover, the two sets of circulation pumps are convenient for inspection, repair, and maintenance.

[0029] 5. The low-temperature circulation loop and medium-temperature circulation loop systems of the present invention are equipped with a pneumatic control valve three-valve group, which forms a temperature control interlock with the drying roller temperature sensor. It effectively controls the flow rate of the heat transfer oil replenished from the low- and medium-temperature circulation systems to the high-temperature circulation system in real time to maintain the temperature of the heat transfer oil in their respective loops, achieving the purpose of drying at a constant temperature. In addition, the pneumatic control valve three-valve group is convenient for inspection, repair, and maintenance.

[0030] 6. The present invention uses heat transfer oil as the medium. The heat transfer oil drying roller is heated evenly, with high temperature control accuracy. In addition, the heat transfer oil medium has a low operating pressure, reducing the safety risk. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the automatic constant temperature control system for the carbon fiber production drying roller of the present invention;

[0032] Figure 2 It is a partial schematic diagram of the automatic constant temperature control system for the carbon fiber production drying roller of the present invention.

[0033] The identifications in the figure are as follows: 1 is the heat transfer oil storage tank, E-12 is the injection oil pump, E-10 is the first high-temperature circulation pump, E-11 is the second high-temperature circulation pump, 2 is the heat transfer oil heater, 3 is the sizing and drying roller, 4 is the first water washing and drying roller, 9 is the first temperature transmitter, 10 is the first temperature sensor, 6 is the pneumatic control valve three-valve group A, E-6 is the first medium-temperature circulation pump, E-7 is the second medium-temperature circulation pump, 5 is the second water washing and drying roller, 7 is the second temperature transmitter, 11 is the second temperature sensor, 8 is the pneumatic control valve three-valve group B, E-8 is the first low-temperature circulation pump, E-9 is the second low-temperature circulation pump, 4 is the first water washing and drying roller, 13 is the third temperature transmitter, 12 is the third temperature sensor, 14 is the heat transfer oil control cabinet, Y-1 to Y-6 are filters, and V-1 to V-44 are gate valves; Detailed implementation manners

[0034] The terms used in the present invention are only for the purpose of explaining the embodiments of the present invention and are not intended to limit the present invention. The following combines the attached Figure 1-2 drawings to detail some embodiments of the present invention.

[0035] The present invention relates to an automatic constant temperature control system and a usage method for drying rollers in carbon fiber production, which solves the problem that the surface temperature of the drying roller in the prior art cannot reach the constant temperature effect and affects the fiber hairiness.

[0036] An automatic constant temperature control system for drying rollers in carbon fiber production includes a heat transfer oil storage tank 1, an injection oil pump E-12, a circulation loop constant temperature system, and a heat transfer oil control cabinet 13.

[0037] The injection oil pump E-12 is used to transport the heat transfer oil into the storage tank 1.

[0038] The circulation loop constant temperature system includes: a low-temperature circulation loop constant temperature system, a medium-temperature circulation loop constant temperature system, and a high-temperature circulation loop constant temperature system. The low-temperature circulation loop constant temperature system is used for the first water washing and drying in carbon fiber surface treatment, the medium-temperature circulation loop constant temperature system is used for the second water washing and drying, and the high-temperature circulation loop constant temperature system is used for sizing and drying. The heating medium of the drying roller is heat transfer oil.

[0039] Among them, the high-temperature circulation loop constant temperature system includes: a high-temperature circulation pump assembly, a heat transfer oil heater 2, a sizing and drying roller 3, a first temperature transmitter 9, and a first temperature sensor 10;

[0040] One end of the high-temperature circulation pump assembly is connected to the heat-conducting oil storage tank 1, and the other end is connected to the oil inlet end of the heat-conducting oil heater; the oil outlet end of the heat-conducting oil heater 2 is connected to the sizing and drying roller 3. A first temperature sensor 10 is arranged inside the sizing and drying roller 3 for collecting the temperature data of the sizing and drying roller in real time. The first temperature sensor 10, the first temperature transmitter 9, the temperature controller in the heat-conducting oil heater 2, and the heat-conducting oil control cabinet 14 are connected by signals. The heat-conducting oil control cabinet 14 completes the operation of the high-temperature circulation loop by receiving information and feedback information.

[0041] The high-temperature circulation pump assembly is used to transport the heat-conducting oil to the heat-conducting oil heater 2. It includes a first high-temperature circulation pump E-10, a second high-temperature circulation pump E-11, a filter, and a gate valve; the first high-temperature circulation pump E-10 and the second high-temperature circulation pump E-11 are connected in parallel through the filter and the gate valve.

[0042] The medium-temperature circulation loop constant temperature system includes: a pneumatic control valve three-valve group A 6, a medium-temperature circulation pump assembly, a water-washing and drying roller two 5, a second temperature transmitter 7, and a second temperature sensor 11.

[0043] One end of the pneumatic control valve three-valve group A 6 is connected to the high-temperature circulation loop, one end is connected to the oil inlet end of the medium-temperature circulation pump assembly, and the other end is connected to the oil outlet end of the water-washing and drying roller two 5; the oil outlet end of the medium-temperature circulation pump assembly is connected to the oil inlet end of the water-washing and drying roller two 5. A second temperature sensor 11 is arranged inside the water-washing and drying roller two 5 for collecting the temperature data of the drying roller two 5 in real time. The second temperature sensor 11, the second temperature transmitter 7, the pneumatic control valve three-valve group A 6, and the heat-conducting oil control cabinet 14 are connected by signals. The heat-conducting oil control cabinet 14 completes the operation of the medium-temperature loop by receiving information and feedback information.

[0044] The medium-temperature circulation pump assembly is used to send the heat-conducting oil to the water-washing and drying roller two 5; it includes a first medium-temperature circulation pump E-6, a second medium-temperature circulation pump E-7, a filter, and a gate valve; the first medium-temperature circulation pump E-6 and the second medium-temperature circulation pump E-7 are connected in parallel through the filter and the gate valve.

[0045] The low-temperature circulation loop constant temperature system includes: a pneumatic control valve three-valve group B 8, a low-temperature circulation pump assembly, a water-washing and drying roller one 4, a third temperature transmitter 13, and a third temperature sensor 12.

[0046] One end of the three-valve group B 8 of the pneumatic control valve is connected to the high-temperature circulation loop, one end is connected to the oil inlet end of the low-temperature circulation pump assembly, and the other end is connected to the oil outlet end of the first water-washing and drying roller 4; the oil outlet end of the low-temperature circulation pump assembly is connected to the oil inlet end of the first water-washing and drying roller 4. A third temperature sensor 12 is arranged in the first water-washing and drying roller 4 for collecting the temperature data of the first drying roller in real time; the third temperature sensor 12, the third temperature transmitter 13, the three-valve group B 8 of the pneumatic control valve and the heat-conducting oil control cabinet 14 are signal-connected. The heat-conducting oil control cabinet 14 completes the operation of the low-temperature loop by receiving information and feedback information.

[0047] The low-temperature circulation pump assembly includes a first low-temperature circulation pump E-8, a first low-temperature circulation pump E-9, a filter and a gate valve; the first low-temperature circulation pump E-8 and the first low-temperature circulation pump E-9 are connected in parallel through the filter and the gate valve.

[0048] The heat-conducting oil control cabinet 14 includes a processor part and a display and control part. The heat-conducting oil control cabinet 14 is used for receiving the signal transmitted by the temperature transmitter, monitoring the temperature of the drying roller in real time, and setting the temperatures of the drying cylinders in the low-temperature, medium-temperature and high-temperature circulation loops according to the actual production requirements.

[0049] The working principle of the automatic constant-temperature control system for the drying roller in carbon fiber production in the present invention is as follows:

[0050] In the high-temperature circulation loop constant-temperature system, the heat-conducting oil is transported to the heat-conducting oil heater 2 by the high-temperature circulation pump assembly for heating and then sent to the sizing and drying roller 3. The first temperature sensor 10 collects the temperature data of the drying roller in real time and transmits it to the processor of the heat-conducting oil control cabinet 14 through the first temperature transmitter 9. The processor of the heat-conducting oil control cabinet 14 compares the received temperature data with the preset constant-temperature value. If the temperature is lower than the constant-temperature value, the processor increases the power of the heat-conducting oil heater 2 through the drive circuit to improve the heating intensity and make the temperature rise. If the temperature is higher than the constant-temperature value, the processor reduces the power of the heat-conducting oil heater 2 to reduce the heat supply and make the temperature drop. The processor continuously cycles the above comparison and adjustment to achieve the automatic constant-temperature control of the drying roller.

[0051] In the medium-temperature circulation loop constant-temperature system, the heat-conducting oil is sent to the second water-washing and drying roller 5 by the medium-temperature circulation pump assembly. The second temperature sensor 11 collects the temperature data of the drying roller in real time and transmits it to the processor of the heat-conducting oil control cabinet 14 through the second temperature transmitter 7. The processor of the heat-conducting oil control cabinet 14 compares the received temperature data with the preset constant-temperature value. If the temperature is lower than the constant-temperature value, the processor supplements the high-temperature heat-conducting oil in the high-temperature circulation loop into the medium-temperature circulation loop through the three-valve group A 6 of the pneumatic control valve to make the temperature rise. The processor continuously cycles the above comparison and adjustment to achieve the automatic constant-temperature control of the drying roller.

[0052] The low-temperature circulation loop constant temperature system sends heat-conducting oil to the first washing and drying roller 4 through the low-temperature circulation pump assembly. The third temperature sensor 12 collects the temperature data of the drying roller in real time and transmits it to the processor of the heat-conducting oil control cabinet 14 through the third temperature transmitter 13. The processor compares the received temperature data with the preset constant temperature value. If the temperature is lower than the constant temperature value, the processor supplements the high-temperature heat-conducting oil in the high-temperature circulation loop into the low-temperature circulation loop through the pneumatic control valve three-valve group B8 to raise the temperature. The processor continuously cycles through the above comparisons and adjustments to achieve automatic constant temperature control of the drying roller.

[0053] The present invention further includes a communication module, which transmits information such as real-time temperature and control status to the monitoring system or the host computer, facilitating remote monitoring and data analysis by the operator.

[0054] This embodiment discloses a method of using an automatic constant temperature control system for a carbon fiber production drying roller. After the system is started and initialized, it includes the following steps:

[0055] Step 1: Inject heat-conducting oil into the heat-conducting oil storage tank 1 with the oil injection pump E-12, and open the respective circuits of the low-temperature, medium-temperature, and high-temperature circulation pumps to start circulating.

[0056] Step 2: Set the constant temperature values of 140 °C, 100 °C, and 80 °C for the drying rollers of the high-temperature, medium-temperature, and low-temperature circuit systems in the heat-conducting oil control cabinet 14, and the heat-conducting oil heater starts to heat up until the temperature of the sizing and drying roller is 140 °C.

[0057] Step 3: For the high-temperature circulation loop constant temperature system, the first temperature sensor 10 collects the temperature data of the sizing and drying roller in real time and transmits it to the processor of the heat-conducting oil control cabinet 14 through the temperature transmitter 9. The processor of the heat-conducting oil control cabinet 14 compares the received temperature data with the preset constant temperature value. If the temperature is lower than the constant temperature value, the processor increases the power of the heat-conducting oil heater 2 through the drive circuit to increase the heating intensity and raise the temperature. If the temperature is higher than the constant temperature value, the processor reduces the power of the heat-conducting oil heater 2 to reduce the heat supply and lower the temperature. The processor continuously cycles through the above comparisons and adjustments to achieve automatic constant temperature control of the drying roller.

[0058] Step 4: For the medium-temperature circulation loop constant temperature system, the second temperature sensor 11 collects the temperature data of the second drying roller 5 in real time and transmits it to the processor through the second temperature transmitter 7. The processor compares the received temperature data with the preset constant temperature value. If the temperature is lower than the constant temperature value, the processor supplements the high-temperature heat-conducting oil in the high-temperature circulation loop into the medium-temperature circulation loop through the pneumatic control valve three-valve group A6 to raise the temperature. The processor continuously cycles through the above comparisons and adjustments to achieve automatic constant temperature control of the drying roller.

[0059] Step 5: Low-temperature circulation loop constant temperature system. The third temperature sensor 12 collects the temperature data of the first drying roller 4 in real time and transmits it to the processor through the third temperature transmitter 13. The processor compares the received temperature data with the preset constant temperature value. If the temperature is lower than the constant temperature value, the processor replenishes the high-temperature heat-conducting oil in the high-temperature circulation loop into the low-temperature circulation loop through the pneumatic regulating valve three-valve group B8 to increase the temperature. The processor continuously cycles through the above comparison and adjustment to achieve automatic constant temperature control of the drying roller.

[0060] Step 6: Repeat steps 1 to 5 until the constant temperature control operation of the drying roller is achieved.

[0061] The above temperature and the set temperature are both displayed on the display part of the heat-conducting oil control cabinet 14.

[0062] A set of temperature sensors is symmetrically distributed in the south, middle, and north of all the pre-drying rollers, and the temperature sensors are signal-connected to the heat-conducting oil control cabinet.

[0063] A computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute all or part of the steps of the method.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. An automatic constant temperature control system for drying rollers in carbon fiber production, characterized in that: It includes a heat transfer oil storage tank, a circulation loop constant temperature system, and a heat transfer oil control cabinet; the circulation loop constant temperature system includes a low-temperature circulation loop constant temperature system, a medium-temperature circulation loop constant temperature system, and a high-temperature circulation loop constant temperature system; the heat transfer oil storage tank is connected to the high-temperature circulation loop constant temperature system, and the low-temperature circulation loop constant temperature system and the medium-temperature circulation loop constant temperature system are connected to the high-temperature circulation loop constant temperature system loop, the low-temperature circulation loop constant temperature system and the medium-temperature circulation loop constant temperature system are used for water washing and drying, and the high-temperature circulation loop constant temperature system is used for sizing and drying; the heat transfer oil control cabinet is connected to the circulation loop constant temperature system, which is used to receive the signal transmitted by the temperature transmitter, monitor the temperature of the drying roller in real time, and set the temperature of the low-temperature, medium-temperature, and high-temperature circulation loop drying rollers according to actual production needs.

2. The automatic constant temperature control system for drying rollers for carbon fiber production according to claim 1 is characterized in that: The high temperature circulation loop constant temperature system includes: a high temperature circulation pump assembly, a thermal oil heater, a sizing and drying roller, a first temperature transmitter, and a first temperature sensor; One end of the high-temperature circulation pump assembly is connected to the thermal oil storage tank, and the other end is connected to the oil inlet of the thermal oil heater; the oil outlet of the thermal oil heater is connected to the sizing and drying roller, and a first temperature sensor is provided in the sizing and drying roller for real-time temperature data collection of the sizing and drying roller; the first temperature sensor, the first temperature transmitter, the temperature controller in the thermal oil heater, and the thermal oil control cabinet are signal-connected, and the thermal oil control cabinet completes the high-temperature circulation loop operation by receiving information and feeding back information.

3. The automatic constant temperature control system for drying rollers for carbon fiber production according to claim 2 is characterized in that: The warm circulation pump assembly is used to transport the thermal oil to the thermal oil heater, and includes a first high-temperature circulation pump, a second high-temperature circulation pump, a filter and a gate valve; the first high-temperature circulation pump and the second high-temperature circulation pump are connected in parallel through the filter and the gate valve.

4. The automatic constant temperature control system for drying rollers for carbon fiber production according to claim 1 is characterized in that: The medium temperature circulation loop constant temperature system includes: a pneumatic regulating valve three-valve group, a medium temperature circulation pump assembly, a second washing and drying roller, a second temperature transmitter, and a second temperature sensor; One end of the pneumatic control valve three-valve group A is connected to the high-temperature circulation loop, one end is connected to the oil inlet end of the medium-temperature circulation pump assembly, and the other end is connected to the oil outlet end of the water washing and drying roller two; the oil outlet end of the medium-temperature circulation pump assembly is connected to the oil inlet end of the water washing and drying roller two, and a second temperature sensor is arranged in the water washing and drying roller two for real-time collection of temperature data of the drying roller two; the second temperature sensor, the second temperature transmitter, the pneumatic control valve three-valve group, and the thermal oil control cabinet are signal-connected, and the thermal oil control cabinet completes the operation of the medium-temperature circuit by receiving and feeding back information.

5. The automatic constant temperature control system for drying rollers for carbon fiber production according to claim 4 is characterized in that: The medium temperature circulation pump assembly is used to deliver the heat transfer oil to the washing and drying roller two, and includes a first medium temperature circulation pump, a second medium temperature circulation pump, a filter and a gate valve; the first medium temperature circulation pump and the second medium temperature circulation pump are connected in parallel through the filter and the gate valve.

6. The automatic constant temperature control system for drying rollers for carbon fiber production according to claim 1, characterized in that: The low-temperature circulation loop constant temperature system includes: a pneumatic regulating valve three-valve group, a low-temperature circulation pump assembly, a water washing and drying roller one, a third temperature transmitter, and a third temperature sensor; One end of the pneumatic control valve three-valve group is connected to the high-temperature circulation loop, one end is connected to the oil inlet end of the low-temperature circulation pump assembly, and the other end is connected to the oil outlet end of the water washing and drying roller one; the oil outlet end of the low-temperature circulation pump assembly is connected to the oil inlet end of the water washing and drying roller one, and a third temperature sensor is arranged in the water washing and drying roller one for real-time temperature data collection of the drying roller one; the third temperature sensor, the third temperature transmitter, the pneumatic control valve three-valve group and the heat transfer oil control cabinet are connected by signal, and the heat transfer oil control cabinet completes the operation of the low-temperature circuit by receiving information and feeding back information.

7. The automatic constant temperature control system for drying rollers for carbon fiber production according to claim 6 is characterized in that: The low-temperature circulation pump assembly includes a first low-temperature circulation pump, a first low-temperature circulation pump, a filter and a gate valve; the first low-temperature circulation pump and the first low-temperature circulation pump are connected in parallel through the filter and the gate valve.

8. A method for using an automatic constant temperature control system for a carbon fiber production drying roller, characterized in that: The automatic constant temperature control system for the carbon fiber production drying roller according to any one of claims 1 to 7 comprises the following specific steps: Step 1: Use an oil injection pump to inject the heat transfer oil into the heat transfer oil storage tank, turn on the low temperature circulation pump assembly, the medium temperature circulation pump assembly, and the high temperature circulation pump assembly, and start circulation in each loop; Step 2, the thermal oil control cabinet sets the constant temperature of the drying rollers in the low-temperature circulation loop constant temperature system, the medium-temperature circulation loop constant temperature system, and the high-temperature circulation loop constant temperature system, and the thermal oil heater starts to heat up until the temperature of the sizing drying roller reaches the constant temperature of the sizing drying roller in the high-temperature circulation loop constant temperature system; Step 3: In the high-temperature circulation loop constant temperature system, the first temperature sensor collects the temperature data of the sizing and drying roller in real time and transmits it to the processor of the thermal oil control cabinet through the first temperature transmitter; The processor of the thermal oil control cabinet compares the received temperature data with the preset constant temperature value of the sizing and drying roller. If the temperature is lower than the constant temperature value, the processor increases the power of the thermal oil heater through the driving circuit to increase the heating intensity and increase the temperature; if the temperature is higher than the constant temperature value, the processor reduces the power of the thermal oil heater, reduces the heat supply and reduces the temperature; the processor continuously cycles to compare and adjust to achieve automatic constant temperature control of the drying roller; Step 4, medium temperature circulation loop constant temperature system, the second temperature sensor collects the temperature data of the washing and drying roller 2 in real time, and transmits it to the processor of the heat transfer oil control cabinet through the second temperature transmitter; the processor compares the received temperature data with the preset constant temperature value of the washing and drying roller 2, if the temperature is lower than the constant temperature value, the processor replenishes the high temperature heat transfer oil in the high temperature circulation loop into the medium temperature circulation loop through the pneumatic regulating valve three-valve group to increase the temperature; the processor continuously performs the above comparison and adjustment to realize automatic constant temperature control of the drying roller; Step 5, low-temperature circulation loop constant temperature system, the third temperature sensor collects the temperature data of the washing and drying roller one in real time, and transmits it to the processor of the thermal oil control cabinet through the third temperature transmitter; the processor compares the received temperature data with the preset constant temperature value. If the temperature is lower than the constant temperature value, the processor replenishes the high-temperature thermal oil in the high-temperature circulation loop into the low-temperature circulation loop through the three-valve group of pneumatic control valves to increase the temperature; the processor continuously performs the above comparison and adjustment in a cycle to realize automatic constant temperature control of the drying roller. Step 6: Repeat steps 1 to 5 until the drying roller is operated at a constant temperature.

9. The method for using the automatic constant temperature control system for drying rollers in carbon fiber production according to claim 8, characterized in that: The constant temperature setting values ​​of the drying rollers in the low-temperature circulation loop constant temperature system, medium-temperature circulation loop constant temperature system and high-temperature circulation loop constant temperature system of the heat transfer oil control cabinet are 80℃, 100℃ and 140℃ respectively.

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