CN117548037B - PAN-based carbon fiber auxiliary agent delivery device and delivery method thereof - Google Patents
PAN-based carbon fiber auxiliary agent delivery device and delivery method thereof Download PDFInfo
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- CN117548037B CN117548037B CN202410039077.3A CN202410039077A CN117548037B CN 117548037 B CN117548037 B CN 117548037B CN 202410039077 A CN202410039077 A CN 202410039077A CN 117548037 B CN117548037 B CN 117548037B
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- metering body
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- 239000012752 auxiliary agent Substances 0.000 title claims abstract description 123
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 26
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000002716 delivery method Methods 0.000 title abstract description 5
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 45
- 238000003860 storage Methods 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims description 41
- 239000000654 additive Substances 0.000 claims description 14
- 230000000996 additive effect Effects 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000010992 reflux Methods 0.000 description 5
- 230000001174 ascending effect Effects 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
- B01J4/007—Feed or outlet devices as such, e.g. feeding tubes provided with moving parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2204/00—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices
- B01J2204/002—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices the feeding side being of particular interest
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention provides a PAN-based carbon fiber auxiliary agent delivery device and a delivery method thereof, and relates to the technical field of composite materials, wherein the PAN-based carbon fiber auxiliary agent delivery device is characterized in that a storage body for storing auxiliary agents is arranged, a metering body with a positioning assembly is arranged in the storage body, an overflow pipe is arranged between the metering body and the storage body, a pipe orifice of the overflow pipe arranged in the metering body is an overflow pipe orifice, the positioning assembly is driven to lift by a first driving assembly, and auxiliary agents are injected into the metering body by a second driving assembly until the overflow pipe orifice flows back; the switch component arranged below the metering body is opened, and the auxiliary agent in the metering body can be injected into the polymerization kettle. The invention has the advantages that the positions of the positioning component and the overflow pipe orifice are unchanged, so that the amount of the auxiliary agent which can be kept in the metering body is unchanged, the amount of the auxiliary agent which is put into the polymerization kettle in each batch is kept unchanged, and the error of the addition of the auxiliary agent in each batch is reduced.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a PAN-based carbon fiber auxiliary agent delivery device and a delivery method thereof.
Background
In the existing PAN-based carbon fiber production field, polymerization reaction is carried out intermittently, and auxiliary agents are needed in the PAN-based carbon fiber polymerization reaction, wherein the auxiliary agents are liquid materials, and the addition amount is quite low compared with the raw materials. The auxiliary agent has great influence on the polymerization reaction, and trace change can cause great change of the molecular weight of the polymerization liquid, so that deviation of indexes of the polymerization liquid is caused, the molecular weight distribution is too wide, and the uniformity of the polymerization liquid is poor.
In the PAN-based carbon fiber intermittent feeding reaction, auxiliary agents are required to be added into a polymerization kettle in batches, the addition amounts of the auxiliary agents in different batches are required to be unified, otherwise, the quality fluctuation of the polymerization stock solution is caused. In the prior art, the amount of the auxiliary agent added into the polymerization kettle in each batch is measured by a flowmeter, and the method cannot stop the error of each measurement of the flowmeter.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings in the prior art, the present invention aims to provide a PAN-based carbon fiber additive delivery device and a delivery method thereof.
In a first aspect, the present invention provides a PAN-based carbon fiber additive delivery device, configured to deliver an additive into a polymerization kettle, where the top of the polymerization kettle has a third feed inlet, and the delivery device includes:
the storage body is internally provided with a first space for accommodating an auxiliary agent, and the storage body is provided with a first discharge port and a reflux port which are communicated with the first space;
the metering body is internally provided with a second space and an overflow port communicated with the second space, an overflow pipe is arranged penetrating through the overflow port, the overflow pipe is far away from the end of the metering body and is communicated with the reflux port, a pipe orifice of the overflow pipe arranged in the second space is an overflow pipe orifice, and the height of the overflow pipe orifice is higher than that of the reflux port; the metering body is also provided with a second feeding hole communicated with the second space and a second discharging hole arranged at the bottom of the metering body, and the second discharging hole is positioned right above the third feeding hole;
the positioning assembly is arranged in the second space, and the height of the highest end of the positioning assembly is higher than that of the overflow pipe;
the first driving component is connected with the positioning component and used for driving the positioning component to move up and down in the second space;
one end of the second driving component is communicated with the first discharge hole, and the other end of the second driving component is communicated with the second feed hole and is used for conveying the auxiliary agent in the storage body into the metering body;
and one end of the switch component is communicated with the second discharge port, the other end of the switch component is communicated with the third feed port, and when the switch component is in an open state, the auxiliary agent in the metering body is conveyed into the polymerization kettle.
According to the technical scheme of the invention, the storage body is provided with the first opening communicated with the first space, and the first opening is used for introducing nitrogen into the first space so as to ensure that the first space keeps micro positive pressure.
According to the technical scheme of the invention, the top of the storage body is provided with the second opening communicated with the first space, the top of the metering body is provided with the third opening communicated with the second space, and a gas phase balance air pipe is connected between the second opening and the third opening and used for balancing the air pressure in the first space and the second space.
According to the technical scheme of the invention, the heat tracing assembly is arranged on the material storage body and the metering body, and the heat tracing assembly is used for keeping the temperature in the first space and the temperature in the second space constant.
According to the technical scheme of the invention, the first driving assembly further comprises a locking part used for locking the positioning assembly after the positioning assembly is in place.
According to the technical scheme of the invention, the end, close to the second discharge hole, of the positioning assembly is conical.
According to the technical scheme of the invention, the weighing assembly is arranged at the bottom of the metering body and is used for acquiring the weight of the metering body filled with the auxiliary agent.
According to the technical scheme of the invention, the liquid level sensing assembly is arranged on the metering body and is used for acquiring high liquid level signals and low liquid level signals.
According to the technical scheme of the invention, the overflow pipe comprises a first flow guide pipe, one end of the first flow guide pipe is in sealing connection with the backflow port, the other end of the first flow guide pipe extends into the second space from the overflow port and is in sealing connection with the overflow port, the first flow guide pipe arranged in the second space is rotatably connected with a second flow guide pipe, the second flow guide pipe can rotate by taking the axis of the overflow port as the center, the second flow guide pipe is provided with a first horizontal pipe far away from the first flow guide pipe, and the axis extension direction of the first horizontal pipe is parallel to the axis extension direction of the overflow port; the orifice of the first horizontal pipe is the overflow orifice.
In a second aspect, the present invention provides a method for delivering the PAN-based carbon fiber additive delivering device, which includes the following steps:
s1, obtaining a put batch put in the polymerization kettle and a first mass of the auxiliary agent to be put in each time;
s2, obtaining the downward movement amount of the positioning assembly in the second space according to the first mass conversion;
s3, driving the positioning assembly to move downwards through the first driving assembly according to the downward movement amount;
s4, starting the second driving assembly, and conveying the auxiliary agent into the metering body until the auxiliary agent in the second space flows back into the storage body;
s5, standing for a first preset time period;
s6, starting the switch assembly, and conveying the auxiliary agent in the second space into the polymerization kettle;
s7, closing the switch assembly;
and S, repeating the steps S4-S7 according to the put batch.
In summary, the invention provides a PAN-based carbon fiber additive delivery device, which is used for delivering an additive into a polymerization kettle, and comprises a storage body with a first discharge port and a reflux port, a metering body with an overflow port, a second feed port and a second discharge port, a positioning component, a first driving component, a second driving component and a switch component, wherein the second discharge port is positioned right above a third feed port of the polymerization kettle, the positioning component is arranged in the metering body and can move up and down in the metering body, the top end of the positioning component is higher than the overflow port, the first driving component is used for driving the positioning component to move in the metering body, the second driving component is connected with the first discharge port and the second feed port at two ends of the first driving component and is used for delivering the additive in the storage body into the metering body, and the switch component is arranged between the metering body and the third feed port of the polymerization kettle.
When the automatic feeding device is used, the positioning assembly is driven by the first driving assembly to be arranged at a specified height, the second driving assembly is used for conveying the auxiliary agent into the metering body until the liquid level of the auxiliary agent is higher than the overflow pipe orifice, after the automatic feeding device is kept stand for a specified time, the auxiliary agent higher than the overflow pipe orifice flows back into the storage body, the switch assembly is turned on, and the auxiliary agent in the metering body flows into the polymerization kettle. When the auxiliary agent is put into the polymerization kettle from the next batch, the positioning assembly does not need to be adjusted, and only the auxiliary agent which is conveyed into the metering body from the storage body to be higher than the overflow pipe is required to be repeatedly carried out to flow back into the storage body, and then the switch assembly is started to convey the auxiliary agent into the polymerization kettle. The position of the positioning component is unchanged all the time, and the position of the overflow pipe orifice is unchanged, so that the amount of the auxiliary agent stored in the metering body is unchanged, namely the amount of the auxiliary agent delivered into the polymerization kettle in each batch is unchanged.
Drawings
Fig. 1 is a schematic structural diagram of a PAN-based carbon fiber additive delivery device provided by an embodiment of the present invention;
FIG. 2 is a schematic view of an overflow pipe according to an embodiment of the invention;
fig. 3 is a flowchart of a method for delivering a PAN-based carbon fiber additive delivering device according to an embodiment of the present invention.
1. A storage body; 11. a first discharge port; 12. a return port; 13. a first feed port; 14. a first opening; 15. a gas phase balance gas pipe; 2. a metering body; 21. an overflow port; 22. a second feed inlet; 23. a second discharge port; 24. a liquid level sensing assembly; 3. an overflow pipe; 31. a first draft tube; 321. a first horizontal pipe; 3211. an overflow pipe orifice; 322. a second horizontal tube; 323. a vertical pipe; 324. a first elbow; 325. a second elbow; 326. a first gear; 327. a second gear; 4. a polymerization kettle; 41. a third feed inlet; 5. a positioning assembly; 6. a second drive assembly; 61. a locking part; 62. a support frame; 63. positioning a screw; 71. an automatic valve body; 72. a manual valve body; 73. calibrating a tube; 8. a heat trace component; 9. a weighing assembly; 91. l-shaped supporting frame.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As mentioned in the background art, the present invention proposes a PAN-based carbon fiber additive feeding device, which is used for conveying an additive into a polymerization kettle 4, wherein a third feeding port 41 is provided at the top of the polymerization kettle 4, as shown in fig. 1, and the feeding device includes:
the storage device comprises a storage body 1, wherein a first space is formed in the storage body 1 and used for containing an auxiliary agent, and a first discharge port 11 and a reflux port 12 which are communicated with the first space are formed in the storage body 1; the storage body 1 is further provided with a first feeding port 13 communicated with the first space, and the first feeding port 13 is used for conveying auxiliary agents into the storage body 1.
The metering body 2 is internally provided with a second space, an overflow port 21 communicated with the second space is formed in the metering body 2, an overflow pipe 3 is arranged through the overflow port 21, the end, away from the metering body 2, of the overflow pipe 3 is communicated with the backflow port 12, a pipe orifice of the overflow pipe 3 placed in the second space is an overflow pipe orifice 3211, and the height of the overflow pipe orifice 3211 is higher than that of the backflow port 12; the metering body 2 is also provided with a second feeding hole 22 communicated with the second space and a second discharging hole 23 arranged at the bottom of the metering body, and the second discharging hole 23 is positioned right above the third feeding hole 41; the metering body 2 is a tank with a conical bottom, and the second discharge hole 23 is located right above the third feed hole 41, so that the auxiliary agent in the metering body 2 flows into the polymerization kettle 4 through the second discharge hole 23, the bottom of the metering body 2 is designed into a conical shape, the fluidity of the auxiliary agent at the bottom of the metering body 2 is improved, and the residual phenomenon of the auxiliary agent is avoided. And, when the auxiliary agent in the second space is higher than the overflow pipe mouth 3211, the auxiliary agent flows back to the first space through the overflow pipe 3.
The positioning component 5 is arranged in the second space, and the highest end of the positioning component 5 is higher than the overflow pipe 3; wherein, since the height of the highest end of the positioning assembly 5 is higher than the height of the overflow pipe 3 placed in the second space, the less auxiliary agent can be remained in the second space when the positioning assembly 5 moves downward.
The first driving component is connected with the positioning component 5 and is used for driving the positioning component 5 to move up and down in the second space;
the second driving assembly 6 is communicated with the first discharge hole 11 at one end and the second feeding hole 22 at the other end of the second driving assembly 6, and is used for conveying the auxiliary agent in the storage body 1 into the metering body 2; optionally, the second driving component 6 is a feed pump, when the auxiliary agent is conveyed into the second space through the second driving component 6, the auxiliary agent in the second space is required to be ensured to start overflowing, after the second driving component 6 stops pumping, the auxiliary agent is required to stand for a set period of time, and the auxiliary agent higher than the overflow pipe 3 in the second space is ensured to flow back into the storage body 1 completely, so that the auxiliary agent is prevented from being excessive; optionally, the set duration is 10min.
And one end of the switch component is communicated with the second discharging hole 23, the other end of the switch component is communicated with the third feeding hole 41, and when the switch component is in an open state, the auxiliary agent in the metering body 2 is conveyed into the polymerization kettle 4. A discharge pipe is arranged between the second discharge hole 23 and the third feed hole 41, an automatic valve body 71 is arranged on the discharge pipe near the end of the metering body 2, a manual valve body 72 is arranged near the end of the polymerization kettle 4, before being put in, the automatic valve body 71 is in a closed state, the manual valve body 72 is in an open state, when the auxiliary agent in the second space is put into the polymerization kettle 4, the automatic valve body 71 is opened, and when the auxiliary agent is conveyed from the first space to the second space, the automatic valve body 71 is closed; alternatively, the number of the automatic valve bodies 71 is two.
When the auxiliary agent feeding device is used, the height of the positioning assembly 5 in the second space is obtained by converting the amount of the auxiliary agent added into the polymerization kettle 4 according to the requirement, the second driving assembly 6 is started after the positioning assembly 5 is driven by the first driving assembly to reach a specified position, the auxiliary agent in the storage body 1 is conveyed into the second space until the auxiliary agent overflows in the second space, the switch assembly is started after the auxiliary agent is kept stand for a specified period, and the auxiliary agent in the second space is discharged into the polymerization kettle 4 through the second discharge hole 23, so that the auxiliary agent is fed into the polymerization kettle 4. When putting in again, only need repeatedly carry out and open second drive assembly 6, carry the auxiliary agent to metering body 2 in, to having the auxiliary agent overflow, and after standing still for a preset period of time, open the switch assembly can, need not adjust the height of locating component 5. According to the invention, the height of the positioning assembly 5 is unchanged, the position of the overflow pipe 3 is unchanged, the amount of the auxiliary agent put into the polymerization kettle 4 in each batch is ensured to be unchanged, compared with the prior art, the situation that the quality of products in each batch is different due to metering errors of the flow meter in each batch is avoided, the accuracy of putting the auxiliary agent is improved, and the quality of the products is further improved.
In a preferred embodiment, the storage body 1 is provided with a first opening 14 that is communicated with the first space, and the first opening 14 is used for introducing nitrogen into the first space, so as to ensure that the first space maintains a micro positive pressure.
The first opening 14 is disposed at the top of the storage body 1, and the first opening 14 is connected with a nitrogen delivery pipe in a sealing manner, so that nitrogen is delivered into the first space, and air is prevented from entering the first space, so that the auxiliary agent is deteriorated.
In a preferred embodiment, the top of the storage body 1 has a second opening communicating with the first space, the top of the metering body 2 has a third opening communicating with the second space, and a gas-phase balance gas pipe 15 is connected between the second opening and the third opening, and the gas-phase balance gas pipe 15 is used for balancing the gas pressures in the first space and the second space. The gas phase balance gas pipe 15 balances the gas pressure in the first space and the second space, avoiding the difference in the amount of the auxiliary agent added for each batch due to the differential pressure.
In a preferred embodiment, the heat tracing assembly 8 is disposed on each of the storage body 1 and the metering body 2, and the heat tracing assembly 8 is used for keeping the temperature in the first space and the second space constant.
Wherein, the heat tracing assembly 8 comprises a first heat tracing pipe coiled on the inner wall of the storage body 1 and a second heat tracing pipe wound on the outer wall of the metering body 2; the hot water tank is arranged in the factory, the plate heat exchanger is arranged on the hot water tank, the plate heat exchanger is provided with a water outlet and a water return port, the two ends of the first heat tracing pipe and the second heat tracing pipe are respectively communicated with the water outlet and the water return port, hot water in the hot water tank is cooled to a required temperature through the plate heat exchanger, alternatively, the temperature is 20 ℃, the hot water flows to the first heat tracing pipe or the second heat tracing pipe through the water outlet to heat the storage body 1 or the metering body 2, and then flows back to the hot water tank through the water return port to form circulation. The heat tracing assembly 8 can keep the inside of the metering body 2 and the inside of the storage body 1 at constant temperature all the time, and the variation of the density of the auxiliary agent caused by the temperature variation is eliminated.
In a preferred embodiment, the first drive assembly further comprises a locking portion 61 for locking the positioning assembly 5 when the positioning assembly 5 is in place.
The first driving assembly comprises a supporting frame 62 arranged at the top of the metering body 2, the supporting frame 62 is provided with a horizontal part, the middle part of the horizontal part is provided with a threaded through hole, the first driving assembly comprises a positioning screw 63, one end of the positioning screw 63 penetrates through the threaded through hole and the top of the metering body 2 and is connected with the top of the positioning assembly 5, the positioning screw 63 is in threaded connection with the threaded through hole, a handle is arranged at the top end, far away from the positioning assembly 5, of the positioning screw 63, and the handle is convenient for rotating the positioning screw 63; the top of the metering body 2 is provided with a dial, the extending direction of the dial is vertical, the positioning screw 63 is sleeved with an indicating plate, and the height of the lifting of the positioning assembly 5 can be obtained through the indicating plate and the dial, so that the volume of the auxiliary agent remained in the metering body 2 can be obtained.
In addition, the locking part 61 comprises a locking nut sleeved outside the positioning screw 63, the locking nut is arranged on the side, away from the metering body 2, of the horizontal part, after the positioning screw 63 rotates in place, the positioning screw 63 is manually fixed, and the locking nut is rotated to abut against the horizontal part, so that the locking of the positioning screw 63 and the positioning assembly 5 is realized.
In a preferred embodiment, the end of the positioning assembly 5 near the second outlet 23 is tapered.
The upper part of the positioning component 5 is cylindrical, the lower part of the positioning component is conical, and the conical shape can improve the fluidity of the auxiliary agent and prevent the auxiliary agent from remaining on the outer wall of the positioning component 5.
In a preferred embodiment, a weighing assembly 9 is arranged at the bottom of the metering body 2, and the weighing assembly 9 is used for acquiring the weight of the metering body 2 containing the auxiliary agent.
The weighing assembly 9 comprises a weighing platform and a plurality of weighing trays arranged on the weighing platform, and a first through hole is formed in the middle of the weighing platform; the outer wall circumference of the metering body 2 is provided with a plurality of L-shaped supporting frames 91 in an array distribution, and one end of each L-shaped supporting frame 91 is far away from the outer wall end of the metering body 2 and is arranged on the tray. The bottom of the metering body 2 is provided with a circular opening, a metal hose is connected to the circular opening in a sealing manner, and the metal hose penetrates through the first through hole and is connected with the third feeding hole 41 in a sealing manner.
In a preferred embodiment, a liquid level sensing assembly 24 is provided on the metering body 2, and the liquid level sensing assembly 24 is used for acquiring a high liquid level signal and a low liquid level signal.
Wherein the liquid level sensing assembly 24 comprises a high liquid level sensor and a low liquid level sensor, optionally, both of which are liquid level switches, the high liquid level sensor is arranged on the inner wall of the metering body 2 and is level with the overflow port 21, and the low liquid level sensor is arranged on the inner wall of the bottom of the metering body 2; when the auxiliary agent is injected into the second space, and the liquid level of the auxiliary agent reaches the position of the high liquid level sensor, the high liquid level sensor sends a high liquid level signal to the second driving assembly 6, and after receiving the high liquid level signal, the second driving assembly 6 continues to convey the auxiliary agent into the second space for 5 minutes, so that the auxiliary agent in the metering body 2 is ensured to be added to the required amount and starts overflowing. After the switch assembly is started, the auxiliary agent in the metering body 2 flows into the polymerization kettle 4 through the switch assembly, when the liquid level of the auxiliary agent reaches the position of the low liquid level sensor, the low liquid level sensor sends a low liquid level signal to the switch assembly, and after the switch assembly receives the low liquid level signal, the switch assembly is closed after 5min, so that the auxiliary agent in the metering body 2 is ensured to flow into the polymerization kettle 4.
In a preferred embodiment, the overflow pipe 3 includes a first flow guiding pipe 31, one end of the first flow guiding pipe 31 is connected with the backflow port 12 in a sealing manner, the other end of the first flow guiding pipe extends into the second space from the overflow port 21 and is connected with the overflow port 21 in a sealing manner, the first flow guiding pipe 31 disposed in the second space is rotatably connected with a second flow guiding pipe, the second flow guiding pipe can rotate around the axis of the overflow port 21, the second flow guiding pipe is far away from the first flow guiding pipe 31 and is provided with a first horizontal pipe 321, and the axis extension direction of the first horizontal pipe 321 is parallel to the axis extension direction of the overflow port 21; the orifice of the first horizontal pipe 321 is the overflow orifice 3211.
Referring to fig. 2, the second flow guiding pipe further includes a second horizontal pipe 322 and a vertical pipe 323 rotatably connected with the first flow guiding pipe 31, an axis extension line direction of the vertical pipe 323 is a vertical direction, two ends of the vertical pipe 323 are connected with a first elbow 324 and a second elbow 325, the first elbow 324 is far away from the vertical pipe 323 end and is connected with the first horizontal pipe 321, and the second elbow 325 is far away from the vertical pipe 323 end and is connected with the second horizontal pipe 322.
The second horizontal pipe 322 is rotatably connected with the first guide pipe 31 through a bearing, the outer wall of the outer ring of the bearing is in sealing connection with the inner wall of the first guide pipe 31, and the inner wall of the inner ring of the bearing is connected with the outer wall of the second horizontal pipe 322. The second horizontal tube 322 is sleeved with a first gear 326.
The metering body 2 is provided with a first rotating shaft rotatably connected with the metering body, one end of the first rotating shaft is provided with a second gear 327 which can be meshed with the first gear 326, the other end of the first rotating shaft is provided with a third driving assembly which is arranged outside the metering body 2, and the third driving assembly can drive the second gear 327 to drive the first gear 326 to rotate, so that the first horizontal pipe 321 is driven to rotate, and the height of the first horizontal pipe 321 can be changed, so that the height of the overflow pipe orifice 3211 is changed.
Example 2
On the basis of embodiment 1, the invention provides a method for putting a PAN-based carbon fiber auxiliary agent into a device, as shown in fig. 3, comprising the following steps:
s1, obtaining a throwing batch thrown into the polymerization kettle 4 and the first mass of the auxiliary agent required to be thrown each time;
wherein the put-in batch and the first quality are dependent on actual production conditions.
S2, obtaining the downward movement amount of the positioning assembly 5 in the second space according to the first mass conversion;
according to the first mass and the density of the auxiliary agent, the volume of the auxiliary agent to be added each time can be obtained, and then according to the structure of the metering body 2, the downward movement amount of the positioning assembly 5 is calculated.
S3, driving the positioning assembly 5 to move downwards through the first driving assembly according to the downward movement amount; wherein it can be judged whether the positioning assembly 5 is moved down into place by the dial and the indicating plate.
S4, starting the second driving assembly 6, and conveying the auxiliary agent into the metering body 2 until the auxiliary agent in the second space flows back into the storage body 1; at this time, the axis of the overflow pipe mouth 3211 is in the same line as the axis of the overflow port 21;
and (3) injecting an auxiliary agent into the second space through the feeding pump until the high liquid level sensor sends out a high liquid level signal, continuously injecting the auxiliary agent into the second space, continuously feeding for a second preset time, and stopping, wherein the second preset time can be 5min or longer, and the height of the overflow pipe 3 is ensured to be higher.
S5, standing for a first preset time period; optionally, the first preset duration is 10min; the aim is to ensure that all the auxiliary agent above the overflow pipe 3 flows back into the first space through the overflow pipe 3.
S6, starting the switch assembly, and conveying the auxiliary agent in the second space into the polymerization kettle 4; i.e. opening the automatic valve body 71 and the manual valve body 72, the auxiliary agent in the second space flows into the polymerizer 4 due to gravity.
S7, closing the switch assembly; the method also comprises the following steps: when the auxiliary agent in the second space reaches the position of the low liquid level sensor, the low liquid level sensor sends a low liquid level signal to the automatic valve body 71, and after the automatic valve body 71 receives the low liquid level signal, the automatic valve body is closed after a third preset time period, optionally, the third preset time period is 10min, so that the auxiliary agent in the second space is ensured to enter the polymerization kettle 4.
S8, repeating the steps S4-S7 according to the put batch. Since the position of the positioning assembly 5 is unchanged and the position of the overflow pipe 3 is unchanged for each batch, the same amount of auxiliary agent is ensured to be put into the polymerization kettle 4 for each batch.
In a preferred embodiment, a first discharge pipe is disposed between the manual valve body 72 and the automatic valve body 71, the dispensing device further includes a calibration pipe 73, one end of the calibration pipe 73 is communicated with the first discharge pipe, the other end is communicated with a calibration barrel, and the following steps are further included between the step S3 and the step S4:
s311, starting the second driving assembly 6, and conveying the auxiliary agent into the metering body 2 until the auxiliary agent in the second space flows back into the storage body 1;
s312, standing for a fourth preset time period; wherein the fourth preset duration is the same as the first preset duration;
s313, opening the automatic valve body 71, closing the manual valve body 72, and injecting the auxiliary agent in the second space into the calibration barrel;
s314, standing for a fifth preset time period; the fifth preset time period is the same as the third preset time period;
s315, acquiring the weight of the calibration barrel containing the auxiliary agent through the weighing assembly 9, and acquiring the first net weight of the auxiliary agent in the calibration barrel;
s316, comparing the first net weight with the second net weight calculated according to the first quality, and if the absolute value of the difference value between the first net weight and the second net weight is larger than a first preset threshold value, adjusting the positioning assembly 5 until the absolute value of the difference value between the first net weight and the second net weight is smaller than the first preset threshold value.
In a preferred embodiment, step S5 further comprises: after the first preset time period is kept stand, a first weight value is obtained through the weighing assembly 9, and when the next batch is executed in the step S5, a second weight value is obtained through the weighing assembly 9, and when the absolute value of the difference value between the first weight value and the second weight value is larger than a second preset threshold value, an alarm instruction is sent out.
In some specific situations, when the positioning assembly 5 loosens to cause downward movement, or the positioning screw 63 breaks to cause the positioning assembly 5 to drop, the amount of the auxiliary agent injected into the second space is greatly different from the amount of the previous batch, so that the deviation between the first weight value and the second weight value is great, and the alarm instruction can control to stop feeding, so that the waste of the auxiliary agent is avoided.
In a preferred embodiment, the following steps are further included between step S3 and step S4:
s321, calling a wall built database to obtain wall built quantity; the wall built-up database at least comprises an immersion height and a wall built-up quantity corresponding to the immersion height; the immersion height is the height of the positioning assembly 5 below the lower edge of the overflow port 21, and the wall hanging amount is the amount of the auxiliary agent remained on the outer wall of the positioning assembly 5 after each batch of throwing is completed;
the auxiliary agent is liquid level and has a certain concentration, and although the switch assembly is closed after the liquid level in the second space reaches the low liquid level sensor and passes through the third preset time, the auxiliary agent residue can still exist, so that the residue needs to be compensated before the first batch is put in; the wall built-up database can be obtained through multiple off-line simulation experiments.
S322, calculating to obtain the ascending height according to the wall hanging amount, wherein the ascending height is the height of the overflow pipe opening 3211 moving upwards;
wherein the volume of the residual auxiliary agent can be obtained according to the wall-hanging amount, and the rising height can be obtained through the inner diameter of the metering body 2;
s323, controlling the third driving assembly to drive the first horizontal pipe 321 to rotate according to the ascending height;
the first horizontal pipe 321 rotates around the axis of the overflow port 21, and the vertical height of the first horizontal pipe 321 can be adjusted. Therefore, in step S4, the second driving assembly 6 injects the auxiliary agent into the second space until the auxiliary agent flows back from the overflow pipe 3211, the overflow pipe 3211 is the pipe of the first horizontal pipe 321, and after the overflow pipe 3211 is lifted, the amount of the auxiliary agent remaining in the second space is increased, so as to compensate the residual amount on the outer wall of the positioning assembly 5. The accuracy of adding the auxiliary agent is improved.
The above description is only illustrative of the preferred embodiments of the present invention and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in the present invention is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present invention (but not limited to) having similar functions are replaced with each other.
Claims (9)
1. A PAN-based carbon fiber auxiliary agent delivery device for delivering auxiliary agents into a polymerization kettle (4), wherein the top of the polymerization kettle (4) is provided with a third feed inlet (41), and the PAN-based carbon fiber auxiliary agent delivery device is characterized by comprising:
the novel automatic feeding device comprises a storage body (1), wherein a first space is formed in the storage body (1) and used for containing an auxiliary agent, and a first discharge port (11) and a backflow port (12) which are communicated with the first space are formed in the storage body (1);
the metering body (2) is internally provided with a second space and an overflow port (21) communicated with the second space, an overflow pipe (3) is arranged through the overflow port (21), the end, away from the metering body (2), of the overflow pipe (3) is communicated with the backflow port (12), a pipe orifice of the overflow pipe (3) arranged in the second space is an overflow pipe orifice (3211), and the height of the overflow pipe orifice (3211) is higher than that of the backflow port (12); the metering body (2) is also provided with a second feeding hole (22) communicated with the second space and a second discharging hole (23) arranged at the bottom of the metering body, and the second discharging hole (23) is positioned right above the third feeding hole (41);
the overflow pipe (3) comprises a first guide pipe (31), one end of the first guide pipe (31) is in sealing connection with the backflow port (12), the other end of the first guide pipe extends into the second space from the overflow port (21) and is in sealing connection with the overflow port (21), the first guide pipe (31) arranged in the second space is rotatably connected with a second guide pipe, the second guide pipe can rotate by taking the axis of the overflow port (21) as the center, the second guide pipe is far away from the first guide pipe (31) and is provided with a first horizontal pipe (321), and the axis extension line direction of the first horizontal pipe (321) is parallel to the axis extension line direction of the overflow port (21). The pipe orifice of the first horizontal pipe (321) is the overflow pipe orifice (3211);
the positioning component (5) is arranged in the second space, and the height of the highest end of the positioning component (5) is higher than that of the overflow pipe (3); the upper part of the positioning component (5) is cylindrical, the lower part of the positioning component is conical, and the conical shape is used for improving the fluidity of the auxiliary agent and preventing the auxiliary agent from remaining on the outer wall of the positioning component (5);
the first driving assembly is connected with the positioning assembly (5) and used for driving the positioning assembly (5) to move up and down in the second space;
the second driving assembly (6), one end of the second driving assembly (6) is communicated with the first discharge hole (11), and the other end of the second driving assembly is communicated with the second feed hole (22) and is used for conveying the auxiliary agent in the storage body (1) into the metering body (2);
and one end of the switch component is communicated with the second discharge port (23), the other end of the switch component is communicated with the third feed port (41), and when the switch component is in an open state, the auxiliary agent in the metering body (2) is conveyed into the polymerization kettle (4).
2. The PAN-based carbon fiber auxiliary agent delivery device according to claim 1, wherein the storage body (1) is provided with a first opening (14) communicated with the first space, and the first opening (14) is used for introducing nitrogen into the first space so as to ensure that the first space maintains micro positive pressure.
3. PAN-based carbon fiber auxiliary agent delivery device according to claim 1, characterized in that the top of the storage body (1) is provided with a second opening communicated with the first space, the top of the metering body (2) is provided with a third opening communicated with the second space, a gas phase balance air pipe (15) is connected between the second opening and the third opening, and the gas phase balance air pipe (15) is used for balancing the gas pressure in the first space and the second space.
4. The PAN-based carbon fiber auxiliary agent delivery device according to claim 1, wherein heat tracing components (8) are arranged on the storage body (1) and the metering body (2), and the heat tracing components (8) are used for keeping the temperature in the first space and the second space constant.
5. PAN-based carbon fiber additive dispensing device according to claim 1, characterized in that the first drive assembly further comprises a locking part (61) for locking the positioning assembly (5) after the positioning assembly (5) is in place.
6. PAN-based carbon fiber additive delivery device according to claim 1, characterized in that the end of the positioning assembly (5) close to the second discharge opening (23) is conical.
7. PAN-based carbon fiber auxiliary agent delivery device according to claim 1, characterized in that the bottom of the metering body (2) is provided with a weighing assembly (9), the weighing assembly (9) being used for obtaining the weight of the metering body (2) containing the auxiliary agent.
8. The PAN-based carbon fiber auxiliary agent delivery device according to claim 1, wherein a liquid level sensing assembly (24) is arranged on the metering body (2), and the liquid level sensing assembly (24) is used for acquiring a high liquid level signal and a low liquid level signal.
9. A method of delivering a PAN-based carbon fiber additive delivery device according to any one of claims 1 to 8, comprising the steps of:
s1, obtaining a throwing batch thrown into the polymerization kettle (4) and a first mass of the auxiliary agent required to be thrown each time;
s2, obtaining the downward movement amount of the positioning assembly (5) in the second space according to the first mass conversion;
s3, driving the positioning assembly (5) to move downwards through the first driving assembly according to the downward movement amount;
s4, starting the second driving assembly (6), and conveying the auxiliary agent into the metering body (2) until the auxiliary agent in the second space flows back into the storage body (1);
s5, standing for a first preset time period;
s6, starting the switch assembly, and conveying the auxiliary agent in the second space into the polymerization kettle (4);
s7, closing the switch assembly;
s8, repeating the steps S4-S7 according to the put batch.
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