Integrated equipment for polymer solution precipitation granulation and washing

Abstract

The invention discloses integrated equipment for precipitation granulation and washing of a polymer solution, and relates to the technical field of material treatment equipment. The integrated equipment for precipitation granulation and washing of the polymer solution comprises a solution curing device, the granulation cavity is arranged at the bottom of the solution curing device and communicates with the solution curing device, and the granulation cavity is filled with a poor solvent; the cutting device comprises a driving assembly and a cutting assembly, the driving assembly is arranged at the top of the granulation cavity, and the cutting assembly is rotationally arranged in the granulation cavity; the filtering and discharging cavity comprises a filter screen disc, the filter screen disc is arranged on the inner wall of the filtering and discharging cavity, and the filter screen disc is used for filtering particles. According to the device, the hard wires can be completely cut into particles capable of passing through the filter disc, and the problem that the screen needs to be frequently cleaned or replaced due to the fact that filaments which are not completely cut accumulate at the screen is solved, so that the automation degree of polymer material precipitation wire making and crushing granulation equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material processing equipment, and in particular to an integrated equipment for precipitation, granulation and washing of polymer solution. Background Art

[0002] In the process of polymer material synthesis and production, poor solvents are often required to precipitate and make silk, crush and granulate, and wash the products to remove solvents and impurities. This is one of the key links to ensure product purity and performance indicators.

[0003] There are some devices for precipitation, silk making, crushing and granulation of polymer materials in the prior art. For example, the invention patent with publication number: CN117183139A discloses a precipitation granulation screening machine, which belongs to the field of granulation technology and includes a feed pipe section, a precipitation and hardening pipe section, a cutting pipe section and a fluidized screening pipe section; a feed port is provided at the top of the feed pipe section; the precipitation and hardening pipe section is connected to the bottom end of the feed pipe section, and a poor solvent inlet is provided on the side wall; the feed end of the cutting pipe section is connected to the precipitation and hardening pipe section, and a cutting motor is fixedly installed on the outside of the side wall of the cutting pipe section, and the motor shaft of the cutting motor passes through the side wall of the cutting pipe section and is connected to the cutter; the bottom end of the fluidized screening pipe section is connected to the discharge end of the cutting pipe section, and a discharge port is provided at the top or upper part of the fluidized screening pipe section; a wire drawing plate is provided between the feed pipe section and the precipitation and hardening pipe section. The present invention has a compact structure and combines the four functions of precipitation, wire drawing, granulation and screening in one, and can produce continuously, and occupies a small area, and the processing volume is also suitable for adjustment. In addition, the whole process is closed operation, which is friendly to personnel and the environment.

[0004] However, in the prior art, after the hardened filaments are cut into particles by a cutter, under the action of the flow force and pressure of the poor solvent, the particles rise together with the poor solvent and enter the fluidized screening pipe section for screening. During the screening process, because the filaments are driven by the poor solvent through the cutting pipe section, the filaments are not completely cut into a size that can pass through the screen. Even if they are not completely cut, they will be driven to the screen due to the flow force and pressure of the poor solvent. After a period of time, the screen will be blocked due to the accumulation of incompletely cut filaments at the screen, making it impossible to continue working. The screen needs to be cleaned or replaced frequently, thereby reducing the degree of automation of the polymer material precipitation and silk making and crushing and granulation equipment. Summary of the invention

[0005] In view of the defects existing in the prior art, the technical problem solved by the present invention is: how to improve the automation level of the equipment for precipitation and silk making and crushing and granulation of polymer materials.

[0006] In order to achieve the above objectives, the present invention provides an integrated device for polymer solution precipitation, granulation and washing, comprising: A solution solidification device for forming a polymer solution into a hard wire; A granulation chamber is arranged at the bottom of the solution solidification device and is communicated with the solution solidification device, and the interior of the granulation chamber is filled with a poor solvent; The cutting device comprises a driving assembly and a cutting assembly, wherein the driving assembly is arranged at the top of the granulation chamber, and the cutting assembly is rotatably arranged inside the granulation chamber, and the driving assembly is used to drive the cutting assembly to cut the hard wire inside the granulation chamber into particles; The filter discharge chamber is arranged at the bottom of the granulation chamber and is connected to the granulation chamber. The interior of the filter discharge chamber is filled with a poor solvent. The filter discharge chamber includes a filter screen plate, which is arranged on the inner wall of the filter discharge chamber and is used to filter particles.

[0007] By adopting the above technical scheme, the polymer solution is made into hard wire by the solution solidification device. During this process, the poor solvent is continuously input into the solution solidification device. Therefore, the poor solvent flows to the granulation cavity due to gravity, thereby causing the hard wire to enter the granulation cavity with the poor solvent. Since the interior of the granulation cavity is also filled with the poor solvent, the poor solvent input by the solution solidification device will drive the poor solvent in the granulation cavity to flow downward. The driving component will drive the cutting component to rotate in the granulation cavity. When the hard wire passes through the cutting component, it will be cut into particles. The particles are divided into small particles that can pass through the filter screen and large particles that cannot pass through the filter screen due to their size. A part of the small particles flows downward with the poor solvent and thus passes through the filter screen. Since the cutting component will also drive the poor solvent in the granulation cavity to move, the poor solvent drives the remaining small particles and all the large particles to turn up. The turned-up particles can continue to be cut by the cutting component until the large particles are cut into small particles and pass through the filter screen to move to the inside of the receiving tank. At the same time, in the process of cutting the hard wire into particles, the particles are always in contact with the poor solvent. Therefore, in the cutting process, the washing work of the particles is completed at the same time. Therefore, the problem of frequent cleaning or replacement of the screen due to accumulation of incompletely cut filaments at the screen is solved, thereby improving the degree of automation of the equipment for precipitation and silk making and crushing and granulation of polymer materials.

[0008] In one embodiment, the solution solidification device includes, from bottom to top, a solidification fiber-making chamber, a sight glass section, a poor solvent feeding section, a liquid fiber feeding section, and a fiber drawing chamber, and two adjacent structures in the solution solidification device are fixedly connected and communicated.

[0009] By adopting the above technical scheme, the polymer solvent is drawn into liquid filaments through the drawing cavity, and when passing through the liquid filament feeding section, the liquid filaments are completely formed due to their gravity. The liquid filaments combine with the poor solvent to form hard filaments, and when passing through the curing silk making cavity, the hard filaments are completely formed and then enter the granulation cavity. At the same time, the combination of the liquid filaments and the poor solvent and the state inside the equipment can be observed through the sight glass section.

[0010] In one embodiment, the wire drawing cavity includes an upper flange and a lower flange stacked up and down, the upper flange is provided with a feed inlet, the lower flange is provided with a plurality of wire drawing discharge holes, one of a plurality of sets of wire drawing discharge components is installed on the wire drawing discharge hole, the set of wire drawing discharge components includes a plurality of wire drawing discharge hole heads, the diameters of the wire drawing discharge hole heads in different wire drawing discharge components are different, and a solution buffer cavity is arranged between the upper flange and the lower flange.

[0011] By adopting the above technical scheme, the polymer solution flows in through the feed port of the upper flange and is decelerated in the solution buffer chamber, so as to avoid the polymer solution flowing too fast when entering the wire drawing discharge hole of the lower flange, resulting in unqualified quality of the produced liquid filaments. In addition, according to the needs, the wire drawing discharge hole of the appropriate caliber can be selected and installed in the wire drawing discharge hole of the lower flange to form different liquid filaments, thereby improving the applicability of the integrated equipment.

[0012] In one embodiment, the poor solvent feed section is provided with a first liquid level switch port, and a high liquid level switch is installed at the first liquid level switch port. The high liquid level switch is electrically connected to a feed pump and a poor solvent feed valve, and the high liquid level switch is used to control the switch of the feed pump and the poor solvent feed valve.

[0013] By adopting the above technical scheme, a high-alarm liquid level switch is installed on the poor solvent feeding section. When the liquid level of the poor solvent exceeds the high-alarm liquid level switch, the high-alarm liquid level switch will sound an alarm and control the feed pump and the poor solvent feeding valve to be closed, so as to prevent unformed liquid silk from flowing into the poor solvent and combining to form hard silk of unqualified quality. It also prevents the liquid level of the poor solvent from continuing to rise, resulting in blockage of the solidification silk-making chamber, thereby further improving the degree of automation of the precipitation silk-making and crushing granulation equipment of polymer materials.

[0014] In one embodiment, the curing silk-making chamber is provided with a second liquid level switch port, a low liquid level switch is installed at the second liquid level switch port, the low liquid level switch is electrically connected to the feed pump, and the low liquid level switch is used to control the switch of the feed pump.

[0015] By adopting the above technical scheme, a low-alarm liquid level switch is installed on the solidification silk-making chamber. When the liquid level of the poor solvent is lower than the low-alarm liquid level switch, the low-alarm liquid level switch will sound an alarm and control the feed pump to close. Because the combination of liquid silk and poor solvent requires time, it is avoided that the incompletely formed hard silk directly enters the granulation chamber and is cut, resulting in the production of unqualified particles. After the liquid level of the poor solution exceeds the low-alarm liquid level switch, the feed pump is turned on to continue the precipitation and granulation, thereby further improving the degree of automation of the precipitation and silk-making and crushing and granulation equipment of polymer materials.

[0016] In one embodiment, the driving assembly includes a motor and a speed-increasing transmission mechanism, and the motor is connected to the cutting assembly via the speed-increasing transmission mechanism.

[0017] By adopting the above technical solution, kinetic energy is given to the cutting component through the motor, and the kinetic energy is amplified through the speed-increasing transmission mechanism to increase the rotation speed of the cutting component.

[0018] In one embodiment, the cutting assembly includes a rotating shaft, a stabilizing and reinforcing cylinder section and a cutter. The rotating shaft is connected to the motor through a speed increasing transmission mechanism. The rotating shaft is vertically arranged inside the granulation chamber. The stabilizing and reinforcing cylinder section is sleeved on the rotating shaft, and the stabilizing and reinforcing cylinder section can be rotatably arranged on the inner top surface of the granulation chamber. Multiple layers of cutters are installed on the rotating shaft, and the cutters include an upward-flipping cutter and a downward-pressing cutter. The cutter at the bottom layer on the rotating shaft is an upward-flipping cutter.

[0019] By adopting the above technical solution, the motor and the speed increasing transmission mechanism drive the rotating shaft to rotate. Since multiple layers of cutters are installed on the rotating shaft, the cutters on the bottom layer are upward-turning cutters. Since the distance between the cutters on the bottom layer and the filter disc is closest, the upward-turning degree of the particles is further improved, so that large particles come into contact with more cutters, thereby improving the cutting efficiency. At the same time, since the rotating speed of the rotating shaft is relatively fast, a stabilizing and reinforcing cylinder section is sleeved on the rotating shaft to ensure the stability of the rotating shaft rotation and avoid detachment during rotation, which may cause damage to the integrated equipment.

[0020] In one embodiment, a height adjustment assembly is provided on the filter disc, and the height adjustment assembly includes a fixing screw, a cap nut and a fixing ring. The fixing ring is fixedly arranged on the inner wall of the filter discharge chamber, and the fixing screw is detachably arranged on the fixing ring through the cap nut. The cap nut is used to adjust the tightness between the fixing screw and the fixing ring, and the top end of the fixing screw is fixedly connected to the bottom surface of the filter disc.

[0021] By adopting the above technical solution, when it is necessary to adjust the height of the filter disc, first loosen the cap nut to loosen the fixing screw and the fixing ring, so that the movable fixing screw can move upward or downward. Since one end of the fixing screw is fixedly connected to the filter disc, the filter disc is driven to move upward or downward. After adjusting to the preset height, tighten the cap nut again to achieve height control in the granulation chamber, and increase or decrease the number of layers of the cutter on the rotating shaft to meet different cutting requirements, thereby further improving the applicability of the integrated equipment.

[0022] In one embodiment, a sealing head is provided at the bottom of the filter discharge cavity, and the filter discharge cavity is connected to the sealing head, and a discharge port is provided at the bottom of the sealing head.

[0023] By adopting the above technical solution, the filtered particles can flow into the interior of the head and flow to the receiving tank through the discharge port at the bottom of the head.

[0024] In one embodiment, the driving assembly is fixedly connected to the granulation chamber via a fixing frame, and a protective shell is provided on the outside of the fixing frame.

[0025] By adopting the above technical solution, the fixing frame fixes the driving component and the granulation chamber, and prevents dirt and impurities from entering the interior of the mechanical components through the protective shell.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. Through the connection between the solution solidification device, the granulation chamber and the filter discharge chamber, the poor solvent input by the solution solidification device will drive the poor solvent inside the granulation chamber to flow downward, and a part of the particles that can pass through the filter disc will flow downward with the poor solvent, thereby passing through the filter disc. At the same time, the poor solvent drives the remaining particles to turn up, and the turned-up particles can continue to be cut by the cutting component until the particles that cannot pass through the filter disc are cut into particles that can pass through the filter disc and pass through the filter disc, which solves the problem of frequent cleaning or replacement of the screen due to the accumulation of incompletely cut filaments at the screen, thereby improving the degree of automation of the polymer material precipitation silk making and crushing granulation equipment; 2. By installing a high-alarm liquid level switch on the poor solvent feeding section and a low-alarm liquid level switch on the curing silk-making chamber, an alarm is issued for abnormal conditions inside the solution curing device, and the corresponding valves are controlled to be closed, thereby improving the quality of hard silk made from polymer solution and further improving the degree of automation of polymer material precipitation silk-making and crushing granulation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of an integrated device for polymer solution precipitation, granulation and washing according to an embodiment of the present invention; Figure 2 for Figure 1 perspective drawing; Figure 3 This is a control flow chart of an integrated device for polymer solution precipitation, granulation and washing according to an embodiment of the present invention.

[0028] In the figure: 1-drawing cavity, 101-upper flange, 102-lower flange, 103-feeding port, 104-discharging hole, 105-drawing discharging hole head, 106-solution buffer cavity, 2-liquid silk feeding section, 3-poor solvent feeding section, 301-feeding pipe, 4-high liquid level switch, 5-sight glass section, 6-curing silk making cavity, 7-low liquid level switch, 8-granulation cavity, 9-filtration discharging cavity, 901-filter plate, 902-fixing screw, 903-fixing ring, 904-cap nut, 10-head, 11-drive assembly, 12-protective shell, 13-fixing frame, 14-functional interface, 15-rotating shaft, 16-stabilizing and reinforcing cylinder section, 17-cutter, 18-discharging port, 19-cleaning solvent, 20-polymer solvent, 21-tail gas, 22-nitrogen, 23-poor solvent. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0030] The integrated equipment for polymer solution precipitation, granulation and washing in the embodiment of the present invention is shown in FIG. Figure 1 , 2 As shown, the integrated equipment for polymer solution precipitation granulation and washing includes a solution solidification device, which is used to make the polymer solution into hard wire; a granulation chamber 8 is provided at the bottom of the solution solidification device, and the granulation chamber 8 is connected to the solution solidification device, and the interior of the granulation chamber 8 is filled with a poor solvent 23; a cutting device, which includes a driving component 11 and a cutting component, the driving component 11 is arranged at the top of the granulation chamber 8, and the cutting component is rotatably arranged inside the granulation chamber 8, and the driving component 11 is used to drive the cutting component to cut the hard wire inside the granulation chamber 8 into particles; a filtering discharge chamber 9 is provided at the bottom of the granulation chamber 8, and the filtering discharge chamber 9 is connected to the granulation chamber 8, and the interior of the filtering discharge chamber 9 is filled with a poor solvent 23, and the filtering discharge chamber 9 includes a filter disc 901, and the filter disc 901 is arranged on the inner wall of the filtering discharge chamber 9, and the filter disc 901 is used to filter particles. According to actual needs, the filter disc 901 with different screening meshes can be replaced to achieve the production of products with different particle sizes.

[0031] It can be seen that the present invention uses a solution solidification device to make a polymer solution into a hard wire. During this process, a poor solvent 23 is continuously input into the solution solidification device. Therefore, the poor solvent 23 flows to the granulation chamber 8 due to gravity, thereby causing the hard wire to enter the granulation chamber 8 along with the poor solvent 23. Since the interior of the granulation chamber 8 is also filled with the poor solvent 23, the poor solvent 23 input by the solution solidification device will drive the poor solvent 23 in the granulation chamber 8 to flow downward. The driving component 11 will drive the cutting component to rotate inside the granulation chamber 8. When the hard wire passes through the cutting component, it will be cut into particles. The particles are divided into particles that can pass through the filter screen according to their size. The small particles of the disk 901 and the large particles that cannot pass through the filter screen disk 901, part of the small particles flow downward with the poor solvent 23, and thus pass through the filter screen disk 901. Because the cutting component will also drive the poor solvent 23 inside the granulation chamber 8 to move, the poor solvent 23 drives the remaining small particles and all the large particles to turn up, and the turned up particles can continue to be cut by the cutting component until the large particles are cut into small particles and pass through the filter screen disk 901 and move to the inside of the material receiving tank; at the same time, in the process of cutting the hard wire into particles, the particles are always in contact with the poor solvent 23, so in the cutting process, the washing work of the particles is completed at the same time. Therefore, the problem of frequent cleaning or replacement of the screen due to the accumulation of incompletely cut filaments at the screen is solved, thereby improving the degree of automation of the polymer material precipitation silk making and crushing granulation equipment.

[0032] Preferably, the solution solidification device includes, from bottom to top, a solidification fiber-making chamber 6, a sight glass section 5, a poor solvent feed section 3, a liquid fiber feed section 2 and a fiber drawing chamber 1, and two adjacent structures in the solution solidification device are fixedly connected and communicated.

[0033] Specifically, the solidifying silk-making chamber 6 is fixedly connected and communicated with the sight glass section 5, the sight glass section 5 is fixedly connected and communicated with the poor solvent feeding section 3, the poor solvent feeding section 3 is fixedly connected and communicated with the liquid filament feeding section 2, the liquid filament feeding section 2 is fixedly connected and communicated with the drawing chamber 1, the polymer solvent is drawn into liquid filaments through the drawing chamber 1, and when passing through the liquid filament feeding section 2, the liquid filaments are completely formed due to their gravity (it takes a certain amount of time for the liquid filaments to be completely formed), a plurality of functional interfaces 14 are provided on the liquid filament feeding section 2, the functional interface 14 includes a balance connection port, a gas phase port and a pressure measuring port, the liquid filaments are combined with the poor solvent 23 to form hard filaments, and when passing through the solidifying silk-making chamber 6, the hard filaments are completely formed (it takes a certain amount of time for the hard filaments to be completely formed), and then enter the granulation chamber 8, at the same time, the combination of the liquid filaments with the poor solvent 23 and the state inside the equipment can be observed through the sight glass section 5.

[0034] Furthermore, a specific structure of a wire drawing cavity 1 is provided: The wire drawing chamber 1 includes an upper flange 101 and a lower flange 102 stacked up and down. The upper flange 101 is provided with a feed port 103, and the number of the feed ports 103 is designed according to demand. The lower flange 102 is provided with a plurality of wire drawing discharge holes 104. One of a plurality of sets of wire drawing discharge components is installed on the wire drawing discharge hole 104. The set of wire drawing discharge components includes a plurality of wire drawing discharge hole heads 105. The diameters of the wire drawing discharge hole heads 105 in different wire drawing discharge components are different. The diameters of the wire drawing discharge hole heads 105 in the same wire drawing discharge component may be the same or different. A solution buffer chamber 106 is arranged between the upper flange 101 and the lower flange 102.

[0035] Specifically, the polymer solution flows in through the feed port 103 of the upper flange 101 and is decelerated in the solution buffer chamber 106 to prevent the polymer solution from flowing too fast when entering the wire drawing discharge hole 105 of the lower flange 102, which would result in unqualified quality of the produced liquid filaments. According to needs, a wire drawing discharge hole 105 of suitable caliber can be selected and installed in the wire drawing discharge hole 104 of the lower flange 102 to form different liquid filaments, thereby improving the applicability of the integrated equipment.

[0036] Preferably, the poor solvent feed section 3 is provided with a first liquid level switch port, and the first liquid level switch port is installed with a high-alarm liquid level switch 4, which is electrically connected to the feed pump and the poor solvent feed valve, and the high-alarm liquid level switch 4 is used to control the switch of the feed pump and the poor solvent feed valve.

[0037] Specifically, a high-alarm liquid level switch 4 is installed on the poor solvent feeding section 3. When the liquid level of the poor solvent 23 exceeds the high-alarm liquid level switch 4, the high-alarm liquid level switch 4 will sound an alarm and control the feed pump and the poor solvent feed valve to be closed, so as to prevent unformed liquid silk from flowing into the poor solvent 23 and combining to form hard silk of unqualified quality, and also to prevent the liquid level of the poor solvent 23 from continuing to rise, resulting in blockage of the solidification silk-making chamber 6; when the liquid level of the poor solvent 23 is lower than the high-alarm liquid level switch 4, the high-alarm liquid level switch 4 stops the alarm, and controls the feed pump and the poor solvent feed valve to be opened, and continues to perform precipitation and granulation, thereby further improving the degree of automation of the precipitation and silk-making and crushing and granulation equipment of the polymer material.

[0038] Furthermore, the curing silk-making chamber 6 is provided with a second liquid level switch port, and a low-alarm liquid level switch 7 is installed at the second liquid level switch port. The low-alarm liquid level switch 7 is electrically connected to the feed pump, and the low-alarm liquid level switch 7 is used to control the switch of the feed pump.

[0039] Specifically, a low-alarm liquid level switch 7 is installed on the solidification silk-making chamber 6. When the liquid level of the poor solvent 23 is lower than the low-alarm liquid level switch 7, the low-alarm liquid level switch 7 will sound an alarm and control the feed pump to turn off. Because the combination of liquid silk and poor solvent 23 requires time, it is avoided that the incompletely formed hard silk directly enters the granulation chamber 8 and is cut, resulting in the production of unqualified granules. After the liquid level of the poor solution exceeds the low-alarm liquid level switch 7, the low-alarm liquid level switch 7 stops the alarm and controls the feed pump to open, and continues the precipitation and granulation, thereby further improving the degree of automation of the precipitation and silk-making and crushing granulation equipment of polymer materials.

[0040] Preferably, a plurality of poor solvent 23 feed pipes 301 are installed on the poor solvent feed section 3 .

[0041] Specifically, the clamping angle between the poor solvent 23 feeding tube 301 and the liquid filament feeding section 2 is an acute angle, and the oblique injection of the poor solvent 23 into the cavity is conducive to the full mixing of the poor solvent 23 and the liquid filament, and flowing downstream.

[0042] Preferably, a specific structure of a driving assembly 11 is provided: The driving assembly 11 includes a motor and a speed-increasing transmission mechanism, and the motor is connected to the cutting assembly through the speed-increasing transmission mechanism, wherein the speed-increasing transmission mechanism can be connected by large and small pulleys or gears.

[0043] Specifically, kinetic energy is given to the cutting assembly by the motor, and the kinetic energy is amplified by the speed-increasing transmission mechanism to increase the rotation speed of the cutting assembly.

[0044] Furthermore, the driving assembly 11 is fixedly connected to the granulation chamber 8 via a fixing frame 13 , and a protective shell 12 is provided on the outside of the fixing frame 13 .

[0045] Specifically, the motor is fixed to the granulation chamber 8 via a fixing frame 13 , the speed increasing transmission mechanism is fixed to the granulation chamber 8 via a fixing frame 13 , and a protective housing 12 is used to prevent dirt and impurities from entering the interior of the mechanical components.

[0046] Preferably, a specific structure of a cutting assembly is provided: The cutting assembly includes a rotating shaft 15, a stabilizing and reinforcing barrel section 16 and a cutter 17. The rotating shaft 15 is connected to the motor through a speed increasing transmission mechanism. The rotating shaft 15 is vertically arranged inside the granulation chamber 8. The stabilizing and reinforcing barrel section 16 is sleeved on the rotating shaft 15, and the stabilizing and reinforcing barrel section 16 can be rotatably arranged on the inner top surface of the granulation chamber 8. A plurality of layers of cutters 17 are installed on the rotating shaft 15. The cutters 17 include an upward turning cutter and a downward pressing cutter. The cutter 17 of the lowest layer on the rotating shaft 15 is an upward turning cutter, and the cutter 17 of the lowest layer should be relatively close to the filter disc, thereby improving the degree of upward turning of the particles. The cutters 17 of the remaining layers can be either upward turning cutters or downward pressing cutters, and can be designed according to requirements.

[0047] Specifically, the motor and the speed increasing transmission mechanism drive the rotating shaft 15 to rotate. A plurality of layers of cutters 17 are installed on the rotating shaft 15, wherein the cutters 17 on the bottom layer are upwardly turned cutters. Since the distance between the cutters 17 on the bottom layer and the filter disc is closest, the upward turning degree of the particles is further improved, so that large particles come into contact with more cutters 17, thereby improving the cutting efficiency. At the same time, since the rotating shaft 15 rotates at a relatively fast speed, a stabilizing and reinforcing cylinder section 16 is sleeved on the rotating shaft 15 to ensure the stability of the rotation of the rotating shaft 15 and avoid detachment during rotation, which may cause damage to the integrated equipment.

[0048] Preferably, a height adjustment assembly is provided on the filter disc 901, and the height adjustment assembly includes a fixing screw 902, a cap nut 904 and a fixing ring 903. The fixing ring 903 is fixedly provided on the inner wall of the filter discharge chamber 9, and the fixing screw 902 is detachably provided on the fixing ring 903 through the cap nut 904. The cap nut 904 is used to adjust the tightness between the fixing screw 902 and the fixing ring 903. The top end of the fixing screw 902 is fixedly connected to the bottom surface of the filter disc 901.

[0049] Specifically, when it is necessary to adjust the height of the filter disc 901, first loosen and cap the nut 904 to loosen the fixing screw 902 and the fixing ring 903, so that the fixing screw 902 can be moved upward or downward. Since one end of the fixing screw 902 is fixedly connected to the filter disc 901, the filter disc 901 is driven to move upward or downward. After adjusting to the preset height, tighten and cap the nut 904, thereby realizing height control in the granulation chamber 8, and increasing or decreasing the number of layers of the cutting knife 17 on the rotating shaft 15 to meet different cutting requirements, thereby further improving the applicability of the integrated device.

[0050] Preferably, a sealing head 10 is provided at the bottom of the filter discharge cavity 9, and the filter discharge cavity 9 is connected to the sealing head 10, and a discharge port 18 is opened at the bottom of the sealing head 10, and the discharge port 18 is connected to the material receiving tank.

[0051] Specifically, the filtered particles can flow into the interior of the head 10 and flow to the receiving tank through the discharge port 18 at the bottom of the head 10 .

[0052] The operation process and control scheme of the integrated equipment for polymer solution precipitation granulation and washing in the embodiment of the present invention are shown in Figure 3 As shown, the operation process and control scheme include the following steps: Nitrogen sealing protection and cleaning before starting: open the bottom valve (KV-200), nitrogen valve (kV-220) and discharge valve (kV-250) of the granulator, and continue to introduce nitrogen 22 into the granulator for the set time t1, then close the valve and the nitrogen sealing is over. After the nitrogen sealing is over, open the cleaning solvent feed valve (KV-110) and start the feed pump (P-100) to introduce the cleaning solvent 19 into the granulator, start the motor (M-200), and stop after the set time t2, and the cleaning of the feed pipeline, pump body and equipment cavity is over. This process can be set as one-button program control to reduce manual operation.

[0053] Feeding and regulating of bad solvents: Open the bottom valve (KV-200) of the granulator, the bad solvent feeding valve (kV-270), the balancing valve (KV-240) and the receiving valve (KV-300) of the receiving tank, and adjust the opening size of the regulating valve (GBV-201) to adjust the required flow rate. The flow rate is monitored and displayed by the flow meter (FIT-210). Start the high-speed cutter motor (M-200) and set the required speed.

[0054] Solution feeding and crushing granulation: Open the solution feeding valve (KV-120) and start the feed pump (P-100). The polymer solution 20 enters the drawing chamber 1 through the feed pump and is drawn into liquid filaments. The liquid filaments flow downward by gravity and merge with the poor solvent 23 to the solidification filament making chamber 6 to be fully fused and solidified into hard filaments. The hard filaments flow downstream into the granulation chamber 8 and are cut and crushed into granules by the cutter 17. After a short washing and screening on the filter plate 901, they are discharged from the granulator with the poor solvent 23 and transported to the receiving tank (V-300) through a pipeline. The particles that do not reach the screening mesh number continue to be cut, crushed and washed until they can be discharged through the filter plate 901.

[0055] Granulator process monitoring and interlock protection: When the granulation chamber pressure (PT-200) is abnormal, the exhaust gas discharge valve (KV-210) is interlocked to open; when the drawing chamber is blocked and the drawing chamber inlet pressure is abnormal, the feed pump (P-100) is interlocked to close; when the liquid level switch (LS-220) triggers the low liquid level alarm, the feed pump (P-100) is interlocked to close; when the liquid level switch (LS-210) triggers the high liquid level alarm, the feed pump (P-100) is interlocked to close and the bad solvent feed valve (kV-270) is closed; when the granulation chamber working condition is abnormal and hard wire is entangled with the knife, resulting in excessive motor current and triggering an alarm, the motor (M-200) and the feed pump (P-100) are interlocked to close.

[0056] Cleaning, purging and shutdown: Close the solution feed valve (KV-120), open the cleaning solvent feed valve (KV-110), inject the cleaning solvent 19 into the feed pipeline and the granulator, keep the cutter 17 at high speed, keep injecting the poor solvent 23, after the set time t3, close the poor solvent feed valve (kV-270), and after the set time t4, all valves and equipment are closed and shut down. Open the granulator bottom valve (KV-200), nitrogen valve (kV-220) and discharge valve (kV-250), and continue to introduce nitrogen 22 into the granulator for the set time t5. After the nitrogen sealing and purging is completed, all valves are closed, and the granulator shutdown is completed.

[0057] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An integrated device for precipitation, granulation and washing of polymer solutions, characterized in that: It includes: A solution solidification device for forming a polymer solution into a hard wire; A granulation chamber (8), which is arranged at the bottom of the solution solidification device and is in communication with the solution solidification device, and the interior of the granulation chamber (8) is filled with a poor solvent (23); A cutting device, comprising a driving component (11) and a cutting component, wherein the driving component (11) is arranged at the top of the granulation chamber (8), and the cutting component is rotatably arranged inside the granulation chamber (8), and the driving component (11) is used to drive the cutting component to cut the hard wire inside the granulation chamber (8) into particles; A filtration discharge chamber (9) is arranged at the bottom of the granulation chamber (8) and is in communication with the granulation chamber (8); the interior of the filtration discharge chamber (9) is filled with a poor solvent (23); the filtration discharge chamber (9) comprises a filter screen disc (901); the filter screen disc (901) is arranged on the inner wall of the filtration discharge chamber (9); and the filter screen disc (901) is used to filter particles.

2. The integrated equipment for polymer solution precipitation, granulation and washing as claimed in claim 1, characterized in that: The solution solidification device comprises, from bottom to top, a solidification fiber-making chamber (6), a sight glass section (5), a poor solvent feeding section (3), a liquid fiber feeding section (2) and a fiber drawing chamber (1), and two adjacent structures in the solution solidification device are fixedly connected and communicated.

3. The integrated equipment for polymer solution precipitation, granulation and washing as claimed in claim 2, characterized in that: The wire drawing cavity (1) comprises an upper flange (101) and a lower flange (102) stacked up and down, the upper flange (101) is provided with a feed inlet (103), the lower flange (102) is provided with a plurality of wire drawing discharge holes (104), one of a plurality of sets of wire drawing discharge components is installed on the wire drawing discharge hole (104), the set of wire drawing discharge components comprises a plurality of wire drawing discharge hole heads (105), the diameters of the wire drawing discharge hole heads (105) in different wire drawing discharge components are different, and a solution buffer chamber (106) is provided between the upper flange (101) and the lower flange (102).

4. The integrated equipment for polymer solution precipitation, granulation and washing as claimed in claim 2, characterized in that: The poor solvent feed section (3) is provided with a first liquid level switch port, and a high-alarm liquid level switch (4) is installed at the first liquid level switch port. The high-alarm liquid level switch (4) is electrically connected to a feed pump and a poor solvent (23) feed valve, and the high-alarm liquid level switch (4) is used to control the switch of the feed pump and the poor solvent (23) feed valve.

5. The integrated equipment for polymer solution precipitation, granulation and washing as claimed in claim 4, characterized in that: The solidifying silk making chamber (6) is provided with a second liquid level switch port, a low liquid level switch (7) is installed at the second liquid level switch port, the low liquid level switch (7) is electrically connected to the feed pump, and the low liquid level switch (7) is used to control the switch of the feed pump.

6. The integrated equipment for polymer solution precipitation, granulation and washing according to claim 1, characterized in that: The driving assembly (11) comprises a motor and a speed-increasing transmission mechanism, and the motor is connected to the cutting assembly via the speed-increasing transmission mechanism.

7. The integrated equipment for polymer solution precipitation, granulation and washing as claimed in claim 6, characterized in that: The cutting assembly comprises a rotating shaft (15), a stabilizing and reinforcing barrel section (16) and a cutter (17); the rotating shaft (15) is connected to a motor via a speed increasing transmission mechanism; the rotating shaft (15) is vertically arranged inside the granulating chamber (8); the stabilizing and reinforcing barrel section (16) is sleeved on the rotating shaft (15), and the stabilizing and reinforcing barrel section (16) is rotatably arranged on the inner top surface of the granulating chamber (8); a plurality of layers of cutters (17) are mounted on the rotating shaft (15); the cutters (17) comprise an upward turning cutter and a downward pressing cutter; the cutter (17) at the bottom layer on the rotating shaft (15) is an upward turning cutter.

8. The integrated equipment for polymer solution precipitation, granulation and washing as claimed in claim 1, characterized in that: The filter disc (901) is provided with a height adjustment component, which comprises a fixing screw (902), a cap nut (904) and a fixing ring (903); the fixing ring (903) is fixedly arranged on the inner wall of the filter discharge cavity (9); the fixing screw (902) is detachably arranged on the fixing ring (903) via the cap nut (904); the cap nut (904) is used to adjust the tightness between the fixing screw (902) and the fixing ring (903); the top end of the fixing screw (902) is fixedly connected to the bottom surface of the filter disc (901).

9. The integrated equipment for polymer solution precipitation, granulation and washing as claimed in claim 1, characterized in that: A sealing head (10) is provided at the bottom of the filter discharge cavity (9), and the filter discharge cavity (9) is in communication with the sealing head (10), and a discharge port (18) is provided at the bottom of the sealing head (10).

10. The integrated equipment for polymer solution precipitation, granulation and washing according to claim 1, characterized in that: The driving assembly (11) and the granulation chamber (8) are fixedly connected via a fixing frame (13), and a protective shell (12) is provided on the outside of the fixing frame (13).

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