A 4,4'-oxydianiline crystallization apparatus

Abstract

This invention relates to the field of chemical equipment technology, specifically to a 4,4'-diaminodiphenyl ether crystallization device. The device includes a crystallization tank and a feeding mechanism. Two parallel baffles are evenly spaced inside the crystallization tank, dividing it into three crystallization chambers. A feed pipe is fixedly installed at the top of the crystallization tank near the power motor. By using multiple crystallization chambers and multiple feeding mechanisms, this invention enables the stepwise crystallization of a 4,4'-diaminodiphenyl ether solution, resulting in batches of crystal solutions with progressively increasing viscosity, ultimately yielding 4,4'-diaminodiphenyl ether crystals. Compared to existing technologies, this invention can continuously produce 4,4'-diaminodiphenyl ether crystals, thereby increasing the production capacity of 4,4'-diaminodiphenyl ether.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, specifically to a 4,4'-diaminodiphenyl ether crystallization apparatus. Background Technology

[0002] 4,4'-Diaminodiphenyl ether is an organic compound with the chemical formula C12H12N2O. It is mainly used in the manufacture of heat-resistant plastics such as polyimide resins, polymaleimide resins, polyamide-imide resins, polyesterimide resins, epoxy resins, and polyurethanes. It can also be used as a crosslinking agent. The preparation of 4,4'-diaminodiphenyl ether typically requires a crystallization apparatus.

[0003] A search revealed that Chinese patent application number 202321548587.0 discloses a purification device for the production of diaminodiphenyl ether, which can achieve two heating methods and can also perform stirring and filtration. However, due to its tank-type structure, this purification device cannot continuously obtain diaminodiphenyl ether crystal particles during the extraction process. To obtain diaminodiphenyl ether crystals, it is necessary to wait for all the solution in the tank to crystallize, resulting in limited production capacity. Summary of the Invention

[0004] The purpose of this invention is to provide a 4,4'-diaminodiphenyl ether crystallization apparatus to solve the problems mentioned in the background art.

[0005] This invention provides the following technical solution: a 4,4'-diaminodiphenyl ether crystallization apparatus, comprising a crystallization tank and a feeding mechanism. Two parallel partitions are equidistantly arranged inside the crystallization tank, dividing the tank into three crystallization chambers. Two feeding mechanisms are rotatably disposed inside the crystallization tank, distributed within two adjacent crystallization chambers. Each feeding mechanism includes: A central horizontal shaft is rotatably installed inside the crystallization tank; A cross, which is rotatably mounted on the outer wall of a central horizontal shaft; The hinges are hinged to the ends of the cross, and there are four of them, with the four hinges arranged at equal angles to each other; A material scooping box, which is fixedly mounted on the hinge surface; Spring pins, four of which are fixedly installed inside the cross, with each of the four spring pin positions corresponding to one of the four hinge positions; A tension spring, which is fixedly installed between the hinge and the spring pin; An irregularly shaped guide ring is fixedly installed on one side of the partition plate near the cross. An arc-shaped groove is formed on the upper part of the outer wall of the irregularly shaped guide ring; The omnidirectional ball bearing is fixedly installed on one side of the scooping box near the hinge and at the other end away from the hinge.

[0006] As a preferred embodiment of the present invention, the center of the irregular guide ring is concentric with the center of the central horizontal shaft, and the top of the irregular guide ring is provided with a smooth section. The arc-shaped grooves are formed on the smooth section at the top of the irregular guide ring, and there are multiple arc-shaped grooves. The multiple arc-shaped grooves are distributed at equal distances, and the surface of the universal ball abuts against the outer surface of the irregular guide ring.

[0007] In a preferred embodiment of the present invention, a hollow tube is fixedly installed on one side of the cross near the irregular guide ring, and the hollow tube is rotatably mounted on the periphery of the central horizontal shaft via a bearing. The feeding mechanism further includes: Planetary carrier, which is fixedly installed on the outer wall of the hollow tube at the end away from the cross; Planetary gears, wherein the planetary gears are rotatably mounted to the planet carrier via bearings, and there are three of them, with the three planetary gears being arranged at equal angles to each other; The sun gear is fixedly mounted on the outer wall of the central horizontal shaft and located between the three planetary gears; the sun gear meshes with the three planetary gears. An external gear ring is fixedly installed on one side of the partition plate near the cross and located inside the irregular guide ring. The external gear ring is located around the three planetary gears and meshes with the three planetary gears.

[0008] As a preferred embodiment of the present invention, the feeding mechanism further includes: Drainage holes are equidistantly distributed on one side of the material container. A guide rod is slidably mounted to the side of the scooping box away from the drain hole via a linear bearing and extends into the interior of the scooping box; Gravity plate, which is fixedly installed at one end of the guide rod near the inside of the scooping box; A nut, threadedly mounted on the end of the guide rod away from the gravity plate; A return spring is sleeved around the guide rod and fixedly installed between the scooping box and the nut. A protective sleeve is fixedly installed around the reset spring and guide rod.

[0009] As a preferred embodiment of the present invention, the feeding mechanism further includes: The filling port is located on the side of the scooping box away from the irregular guide ring; V-shaped springs are fixedly installed on the inner wall of one side of the scooping box near the filling port, and there are multiple V-shaped springs, which are arranged at equal angles to each other. A round door is fixedly installed between multiple V-shaped spring pieces and located outside the opening of the filling port. The surface of the round door abuts against the inner wall of the scooping box.

[0010] As a preferred embodiment of the present invention, a fixing sleeve is fixedly installed on the outer wall of the central horizontal shaft. The fixing sleeve is located at the end of the feeding mechanism away from the partition. Multiple stirring blades are fixedly installed on the outer wall of the fixing sleeve at equal angles, and multiple rows of stirring blades are arranged along the axial direction of the fixing sleeve. The stirring blades and the fixing sleeve form a 60° angle.

[0011] As a preferred embodiment of the present invention, a power motor is fixedly installed at the top of the crystallization tank, a drive sprocket is fixedly installed on the output shaft of the power motor, a driven sprocket is fixedly installed at the end of the central horizontal shaft near the power motor, and a chain is sleeved between the driven sprocket and the drive sprocket.

[0012] As a preferred embodiment of the present invention, a threaded conveyor plate is fixedly installed on the outer wall of the central horizontal shaft away from the power motor. The specifications of the threaded conveyor plate are adapted to the specifications of the crystallization tank. A discharge port is opened at the bottom of the crystallization tank near the threaded conveyor plate.

[0013] As a preferred embodiment of the present invention, a feed pipe is fixedly installed at the top of the crystallization tank near the power motor, the inside of the feed pipe is in communication with the inside of the crystallization tank, and a control valve is fixedly installed at the top of the feed pipe.

[0014] As a preferred embodiment of the present invention, three hot air pipes are fixedly arranged at equal intervals on the top of the crystallization tank. The interior of each of the three hot air pipes is connected to the interior of the crystallization tank, and the positions of the three hot air pipes correspond one-to-one with the positions of the three crystallization chambers inside the crystallization tank.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up multiple crystallization chambers and multiple feeding mechanisms, the present invention can perform stepwise crystallization of 4,4'-diaminodiphenyl ether solution, thereby obtaining crystal solutions with continuously increasing viscosity in batches, and finally obtaining 4,4'-diaminodiphenyl ether crystals. Compared with the prior art, the present invention can continuously obtain 4,4'-diaminodiphenyl ether crystals, thereby improving the production capacity of 4,4'-diaminodiphenyl ether.

[0016] 2. After the scooping box of the present invention separates from the surface of the 4,4'-diaminodiphenyl ether solution, the dilute solution in the scooping box will flow back into the crystallization tank through the drain hole and the gap between the scooping box and the partition. The precipitated viscous crystals have a high concentration and poor fluidity, and cannot be drained out through the drain hole in a short time. After the scooping box separates from the surface of the 4,4'-diaminodiphenyl ether solution in the crystallization tank, the angle of the guide rod is close to vertical. Under the action of gravity, the gravity plate drives the guide rod to slide into the scooping box. The movement of the gravity plate squeezes the viscous crystals in the scooping box and squeezes out some of the remaining water, making the crystals in the scooping box even more viscous.

[0017] 3. After the material scooping box of the present invention rotates to the top smooth section of the irregular guide ring, the material scooping box and the hinge rotate downward at a certain angle along the end of the cross under the action of gravity and the rebound force of the tension spring, so that the surface of the universal ball abuts against the surface of the top smooth section of the irregular guide ring. At this time, the material scooping box tilts towards the crystallization chamber in the middle of the crystallization tank so that the viscous crystals inside the material scooping box are poured into the middle crystallization chamber.

[0018] 4. In this invention, because the smooth section at the top of the irregularly shaped guide ring is uniformly provided with arc-shaped grooves, the universal ball will contact multiple arc-shaped grooves one by one as it moves along the top of the irregularly shaped guide ring, causing the end of the scooping box to bounce up and down repeatedly, ensuring that the viscous crystals inside the scooping box can be poured out more thoroughly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the crystallization tank in this invention; Figure 3 This is a schematic diagram of the feeding mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the stirring blade of the present invention; Figure 5 This is a schematic diagram of the planar structure of the feeding mechanism of the present invention; Figure 6 This is a partial unfolded structural diagram of the feeding mechanism of the present invention; Figure 7 This is a schematic diagram of the cross and irregularly shaped guide ring of the present invention; Figure 8 This is a schematic diagram of the material-holding box of the present invention; Figure 9 This is a side sectional view of the material container of the present invention; Figure 10 For the present invention Figure 9 A magnified structural diagram of point A in the middle.

[0020] In the diagram: 100, Crystallization tank; 101, Baffle plate; 102, Feed pipe; 103, Hot air pipe; 200, Feeding mechanism; 201, Central horizontal shaft; 202, Cross; 203, Hinge; 204, Scoop box; 205, Spring pin; 206, Tension spring; 207, Irregularly shaped guide ring; 208, Arc-shaped groove; 209, Universal ball bearing; 2010, Hollow tube; 2011, Planetary carrier; 2012, Planetary gear; 2013, ... Male gear; 2014, external gear ring; 2015, drain hole; 2016, guide rod; 2017, gravity plate; 2018, nut; 2019, return spring; 2020, protective sleeve; 2021, filling port; 2022, V-shaped spring; 2023, round gate; 300, fixing sleeve; 301, stirring blade; 400, threaded conveyor plate; 500, power motor; 501, drive sprocket; 502, driven sprocket; 503, chain. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-10 The technical solution provided by the present invention specifically includes the following embodiments: A 4,4'-diaminodiphenyl ether crystallization apparatus includes a crystallization tank 100 and a feeding mechanism 200. Two parallel partitions 101 are equally spaced inside the crystallization tank 100, dividing the tank into three crystallization chambers. A feed pipe 102 is fixedly installed at the top of the crystallization tank 100 near a power motor 500, communicating with the interior of the crystallization tank 100. A control valve is fixedly installed at the top of the feed pipe 102. Three equally spaced hot air pipes 103 are fixedly installed at the top of the crystallization tank 100, communicating with the interior of the crystallization tank 100, and their positions correspond one-to-one with the positions of the three crystallization chambers inside the crystallization tank 100. Two feeding mechanisms 200 are rotatably mounted inside the crystallization tank 100. These two feeding mechanisms 200 are distributed within two adjacent crystallization chambers. Each feeding mechanism 200 includes a central horizontal shaft 201, a cross 202, a hinge 203, a scooping box 204, a spring pin 205, a tension spring 206, a shaped guide ring 207, an arc-shaped groove 208, and a universal ball 209. The central horizontal shaft 201 is rotatably mounted inside the crystallization tank 100. The cross 202 is rotatably mounted on the outer wall of the central horizontal shaft 201. Four hinges 203 are hinged to the ends of the cross 202, and the four hinges 203 are arranged at equal angles. The scooping box 204 is fixedly mounted on the surface of the hinges 203. Four spring pins 205 are fixedly mounted inside the cross 202. The position of the spring pin 205 corresponds one-to-one with the position of the four hinges 203. The tension spring 206 is fixedly installed between the hinge 203 and the spring pin 205. The irregular guide ring 207 is fixedly installed on the side of the partition 101 near the cross 202. The arc-shaped groove 208 is opened on the upper part of the outer wall of the irregular guide ring 207. The universal ball 209 is fixedly installed on the side of the scooping box 204 near the hinge 203 and away from the hinge 203. The center of the irregular guide ring 207 is concentric with the center of the central horizontal shaft 201. The top of the irregular guide ring 207 is provided with a smooth part. The arc-shaped groove 208 is opened on the smooth part of the top of the irregular guide ring 207. There are multiple arc-shaped grooves 208. The multiple arc-shaped grooves 208 are evenly distributed. The surface of the universal ball 209 is in contact with the outer surface of the irregular guide ring 207. A hollow tube 2010 is fixedly installed on one side of the cross 202 near the irregular guide ring 207. The hollow tube 2010 is rotatably mounted on the periphery of the central horizontal shaft 201 via bearings. The feeding mechanism 200 also includes a planetary carrier 2011, planetary gears 2012, a sun gear 2013, and an external gear ring 2014. The planetary carrier 2011 is fixedly installed on the outer wall of the hollow tube 2010 at the end away from the cross 202. The planetary gears 2012 are rotatably mounted on the planetary carrier 2011 via bearings, and the number of them is [missing information]. Three planetary gears 2012 are arranged at equal angles. The sun gear 2013 is fixedly installed on the outer wall of the central horizontal shaft 201 and is located between the three planetary gears 2012. The sun gear 2013 meshes with the three planetary gears 2012. The outer gear ring 2014 is fixedly installed on one side of the partition plate 101 near the cross 202 and is located inside the irregular guide ring 207. The outer gear ring 2014 is located outside the three planetary gears 2012 and meshes with the inner part of the three planetary gears 2012. A fixed sleeve 300 is fixedly installed on the outer wall of the central horizontal shaft 201. The fixed sleeve 300 is located at the end of the feeding mechanism 200 away from the partition 101. Multiple stirring blades 301 are fixedly installed on the outer wall of the fixed sleeve 300 at equal angles. The stirring blades 301 are arranged in multiple rows along the axial direction of the fixed sleeve 300. The stirring blades 301 and the fixed sleeve 300 form a 60° angle. A power motor 500 is fixedly installed at the top of the crystallization tank 100. A drive sprocket 501 is fixedly installed on the output shaft of the power motor 500. A driven sprocket 502 is fixedly installed at the end of the central horizontal shaft 201 near the power motor 500. A chain 503 is sleeved between the driven sprocket 502 and the drive sprocket 501.

[0023] Specifically, a 4,4'-diaminodiphenyl ether solution is introduced into a crystallization chamber inside the crystallization tank 100 near the power motor 500 via a feed pipe 102. The opening and closing of the valve at the end of the feed pipe 102 ensures that the height of the 4,4'-diaminodiphenyl ether solution in the crystallization tank 100 does not exceed the height of the partition 101. Simultaneously, three hot air pipes 103 are connected to the output end of a heating supply device via insulated pipes. Existing heating supply equipment can be used; specific details are not limited. The heating supply device delivers heated high-temperature air through the hot air pipes 103 into the crystallization tank 100, heating the 4,4'-diaminodiphenyl ether solution inside. This causes the water in the solution to gradually evaporate, increasing the concentration of the 4,4'-diaminodiphenyl ether solution inside the crystallization chamber. The 4,4'-diaminodiphenyl ether solution inside the crystallization tank 100 gradually becomes viscous. During this process, the output shaft of the power motor 500 drives the drive sprocket 501 to rotate. The driven sprocket 502 rotates under the transmission action of the chain 503. The rotation of the driven sprocket 502 drives the central horizontal shaft 201, the fixed sleeve 300, and the stirring blade 301 to rotate. The rotation of the stirring blade 301 stirs the 4,4'-diaminodiphenyl ether solution inside the crystallization tank 100, making it more evenly heated. At the same time, since the stirring blade 301 and the fixed sleeve 300 form a 60° angle, the stirring blade 301 also stirs the 4,4'-diaminodiphenyl ether solution inside the crystallization tank 100 during the rotation process. The 4,4'-diaminodiphenyl ether solution generates a thrust towards the feeding mechanism 200, causing it to flow in that direction. This creates a fluid compression effect on the round gate 2023. After being compressed by the fluid, the round gate 2023 moves away from the filling port 2021. Multiple V-shaped springs 2022 are stretched and accumulate elastic force. After the round gate 2023 moves, the filling port 2021 opens, and the flowing 4,4'-diaminodiphenyl ether solution can enter the scooping box 204 through the filling port 2021. The central horizontal shaft 201 also drives the sun gear 2013 to rotate. Since the planetary gear 2012 meshes with the sun gear 2013, and the sun gear 2013 meshes with the external gear ring 2014, which is fixed to the side of the partition 101, the rotation of the sun gear 2013 causes the planetary gear 2012 and the planet carrier 2011 to rotate. The rotation of the planet carrier 2011, through the connection of the hollow tube 2010, drives the central horizontal shaft 201, the four hinges 203, and the four ladles 204 to rotate together. During the rotation of the ladles 204, the 4,4'-diaminodiphenyl ether solution inside them rotates as well. In this process, the ladles 204 drive the rotation of the entire... The ball 209 moves along the outer wall of the irregular guide ring 207. Simultaneously, the drain hole 2015 rotates with the scooping box 204. After the scooping box 204 separates from the surface of the 4,4'-diaminodiphenyl ether solution inside the crystallizing tank 100, the round gate 2023 is no longer compressed by the fluid. The rebound force of the multiple V-shaped springs 2022 is released, pushing the round gate 2023 back against the opening 2021, sealing the opening 2021. Since the gap between the other end of the scooping box 204 and the side of the partition plate 101 is small, the viscous crystals inside the scooping box 204 will not be discharged through the opening 2021 and the other end of the scooping box 204. Furthermore, the scooping box 204 and the 4,4'-diaminodiphenyl ether solution...After the 4'-diaminodiphenyl ether solution is separated from the liquid surface, the dilute solution inside the scooping box 204 will flow back into the crystallization tank 100 through the drain hole 2015 and the gap between the scooping box 204 and the partition plate 101. The precipitated viscous crystals, however, have a higher concentration and poorer fluidity, and cannot flow out through the drain hole 2015 in a short time, remaining inside the scooping box 204. Because the top of the irregularly shaped guide ring 207 has a smooth section, i.e., the irregularly shaped guide ring 20... 7. The top is relatively flat. When the scooping box 204 rotates to the smooth section at the top of the irregular guide ring 207, the scooping box 204 and the hinge 203, under the action of gravity and the rebound force of the tension spring 206, rotate downward at a certain angle along the end of the cross 202, so that the surface of the universal ball 209 contacts the surface of the smooth section at the top of the irregular guide ring 207. At this time, the scooping box 204 tilts towards the crystallization chamber in the middle of the crystallization tank 100, so that the scooping box... The viscous crystals inside the 204 are poured into the intermediate crystallization chamber. Because the smooth section at the top of the irregularly shaped guide ring 207 has evenly distributed arc-shaped grooves 208, the universal ball 209, as it moves along the top of the guide ring 207, will contact multiple arc-shaped grooves 208 one by one, causing the end of the scooping box 204 to bounce repeatedly up and down, ensuring that the viscous crystals inside the scooping box 204 can be poured out more thoroughly. Following the above steps, the initially crystallized viscous crystals in the crystallization chamber near the power motor 500 inside the crystallization tank 100 are gradually transported to the intermediate crystallization chamber, where they recrystallize again, becoming even more viscous. Similar to the above process, the fixing sleeve 300 of the intermediate crystallization chamber cooperates with the feeding mechanism 200 to gradually transport the even more viscous crystals to the crystallization chamber furthest from the power motor 500. Finally, crystallization is completely completed in the last crystallization chamber.

[0024] For further details, please refer to [link / reference]. Figure 5 and Figure 8 As shown: The feeding mechanism 200 also includes drain holes 2015, guide rods 2016, gravity plates 2017, nuts 2018, return springs 2019, and protective sleeves 2020. The drain holes 2015 are evenly distributed on one side of the scooping box 204. The guide rods 2016 are slidably installed on the side of the scooping box 204 away from the drain holes 2015 via linear bearings and extend into the interior of the scooping box 204. The gravity plates 2017 are fixedly installed on one end of the guide rods 2016 near the interior of the scooping box 204. The nuts 2018 are threaded onto the end of the guide rods 2016 away from the gravity plates 2017. The return springs 2019 are sleeved around the guide rods 2016 and fixedly installed between the scooping box 204 and the nuts 2018. The protective sleeves 2020 are fixedly installed around the return springs 2019 and the guide rods 2016.

[0025] Specifically, during the rotation of the scooping box 204, the guide rod 2016, gravity plate 2017, nut 2018, and return spring 2019 also rotate together. The angle between the guide rod 2016 and the horizontal plane gradually changes as the scooping box 204 rotates. When the scooping box 204 separates from the surface of the 4,4'-diaminodiphenyl ether solution inside the crystallization tank 100, the angle of the guide rod 2016 approaches vertical. At this time, under the action of gravity, the gravity plate 2017 drives the guide rod 2016 to slide into the scooping box 204. The return spring 2019 is compressed and accumulates elastic force. Simultaneously, the gravity plate 2017... The moving force plate 2017 squeezes the viscous crystals inside the scooping box 204, squeezing out some of the remaining water. The squeezed-out water flows back into the crystallizing tank 100 through the drain hole 2015. When the scooping box 204 rotates with the cross 202 to the position of the smooth section at the top of the irregular guide ring 207, the guide rod 2016 is close to horizontal. At this time, the pull of the gravity plate 2017 on the guide rod 2016 towards the inside of the scooping box 204 decreases, and the stored return spring 2019 releases its rebound force, pushing the guide rod 2016 and the gravity plate 2017 to reset for subsequent use.

[0026] For further details, please refer to [link / reference]. Figure 2 and Figure 3 As shown: A threaded conveyor plate 400 is fixedly installed on the outer wall of the central horizontal shaft 201 at the end away from the power motor 500. The specifications of the threaded conveyor plate 400 are compatible with the specifications of the crystallization tank 100. A discharge port is opened at the bottom of the crystallization tank 100 near the threaded conveyor plate 400.

[0027] Specifically, after the crystallization is completely completed inside the last crystallization chamber, the crystal is conveyed by the threaded conveyor plate 400 rotating with the central horizontal shaft 201 to the discharge port at the bottom of the crystallization tank 100, and finally discharged from the discharge port.

[0028] In operation, a 4,4'-diaminodiphenyl ether solution is added to a crystallization chamber inside the crystallization tank 100, near the power motor 500, through the feed pipe 102. The opening and closing of the valve at the end of the feed pipe 102 ensures that the height of the 4,4'-diaminodiphenyl ether solution in the crystallization tank 100 does not exceed the height of the partition 101. Simultaneously, three hot air pipes 103 are connected to the output end of a heating supply device via insulated pipes. Existing heating supply equipment can be used, and specific details are not limited. This heating supply device delivers heated high-temperature air to the crystallization tank 100 through the hot air pipes 103, heating the 4,4'-diaminodiphenyl ether solution inside. This causes the water in the solution to gradually evaporate, increasing the concentration of the 4,4'-diaminodiphenyl ether solution inside the crystallization chamber. The 4,4'-diaminodiphenyl ether solution inside the crystallization tank 100 gradually becomes viscous. During this process, the output shaft of the power motor 500 drives the drive sprocket 501 to rotate. Driven by the chain 503, the driven sprocket 502 rotates, which in turn drives the central horizontal shaft 201, the fixed sleeve 300, and the stirring blades 301 to rotate. The rotating stirring blades 301 agitate the 4,4'-diaminodiphenyl ether solution inside the crystallization tank 100, making the heating more uniform. Simultaneously, because the stirring blades 301 and the fixed sleeve 300 form a 60° angle, the stirring blades 301 also agitate the 4,4'-diaminodiphenyl ether solution inside the crystallization tank 100 during rotation. The '-diaminodiphenyl ether solution generates a thrust towards the feeding mechanism 200, causing it to flow towards the feeding mechanism 200, thereby creating a fluid compression effect on the round gate 2023. After being compressed by the fluid, the round gate 2023 will move away from the filling port 2021. Multiple V-shaped springs 2022 are stretched and accumulate elastic force. After the round gate 2023 moves, the filling port 2021 will open, and the flowing 4,4'-diaminodiphenyl ether solution can enter the scooping box 204 through the filling port 2021. Simultaneously, the central horizontal shaft 201 also drives the sun gear 2013 to rotate. Since the planetary gear 2012 meshes with the sun gear 2013, and the sun gear 2013 meshes with the external gear ring 2014, which is fixed to the side of the partition 101, the rotation of the sun gear 2013 will cause the planetary gear 2012 and the planet carrier 2011 to rotate. The rotation of the planet carrier 2011, through the connection of the hollow tube 2010, drives the central horizontal shaft 201, the four hinges 203, and the four scooping boxes 204 to rotate together. During the rotation of the scooping boxes 204, the 4,4'-diaminodiphenyl ether solution inside them will also rotate. During this process, the scooping boxes 204 drive the universal ball 209 to rotate along the outer edge of the irregular guide ring 207. As the wall moves, the drain hole 2015 rotates along with the scooping box 204. After the scooping box 204 separates from the surface of the 4,4'-diaminodiphenyl ether solution inside the crystallizing tank 100, the round gate 2023 is no longer compressed by the fluid. The rebound force of the multiple V-shaped springs 2022 is released, pushing the round gate 2023 back against the opening 2021, sealing the opening 2021. Since the gap between the other end of the scooping box 204 and the side of the partition 101 is small, the viscous crystals inside the scooping box 204 will not be discharged through the opening 2021 and the other end of the scooping box 204. Furthermore, after the scooping box 204 separates from the surface of the 4,4'-diaminodiphenyl ether solution, the dilute solution inside the scooping box 204 will... The precipitated viscous crystals, due to their high concentration and poor fluidity, cannot flow out through the drain hole 2015 and the gap between the scooping box 204 and the partition plate 101, flow back into the crystallization tank 100. They remain inside the scooping box 204 because the precipitated viscous crystals cannot flow out through the drain hole 2015 quickly. During the rotation of the scooping box 204, the guide rod 2016, gravity plate 2017, nut 2018, and return spring 2019 also rotate. The angle between the guide rod 2016 and the horizontal plane gradually changes as the scooping box 204 rotates. When the 4,4'-diaminodiphenyl ether solution in the scooping box 204 separates from the surface of the crystallization tank 100, the angle of the guide rod 2016 approaches vertical. At this point, the gravity plate 2017... Under the action of gravity, the guide rod 2016 slides into the scooping box 204. The return spring 2019 is compressed and stores elastic force. At the same time, the movement of the gravity plate 2017 squeezes the viscous crystals inside the scooping box 204, squeezing out some of the remaining water. The squeezed-out water flows back into the crystallization tank 100 through the drain hole 2015. When the scooping box 204 rotates with the cross 202 to the position of the smooth section at the top of the irregular guide ring 207, the angle of the guide rod 2016 is close to horizontal. At this time, the pull of the gravity plate 2017 on the guide rod 2016 towards the scooping box 204 decreases, and the stored elastic force of the return spring 2019 is released, pushing the guide rod 2016 and the gravity plate 2017 to reset.It should be noted that, because the top of the irregular guide ring 207 has a smooth section, meaning the top of the irregular guide ring 207 is relatively flat, when the scooping box 204 rotates to the smooth section at the top of the irregular guide ring 207, the scooping box 204 and the hinge 203, under the action of gravity and the rebound force of the tension spring 206, rotate downward at a certain angle along the end of the cross 202, causing the surface of the universal ball 209 to contact the surface of the smooth section at the top of the irregular guide ring 207. At this time, the scooping box 204 tilts towards the crystallization chamber in the middle of the crystallization tank 100, so that the viscous crystals inside the scooping box 204 can be poured into the middle crystallization chamber. Since the smooth section at the top of the irregular guide ring 207 is evenly provided with arc-shaped grooves 208, the universal ball 209 will contact multiple arc-shaped grooves 208 one by one during the movement along the top of the irregular guide ring 207, causing the end of the scooping box 204 to... The crystals are repeatedly bounced up and down to ensure that the viscous crystals inside the scooping box 204 can be poured out more thoroughly. Following the above steps, the viscous crystals that have initially crystallized in the crystallization chamber near the power motor 500 inside the crystallization tank 100 are gradually transported to the intermediate crystallization chamber. In the same process, the fixing sleeve 300 of the intermediate crystallization chamber cooperates with the feeding mechanism 200 to gradually transport the more viscous crystals to the crystallization chamber furthest from the power motor 500. When the crystallization in the last crystallization chamber is completely completed, the crystals are transported to the discharge port at the bottom of the crystallization tank 100 by the threaded conveyor plate 400 that rotates with the central horizontal shaft 201, and finally discharged from the discharge port, thereby obtaining 4,4'-diaminodiphenyl ether crystals. Following the above process, 4,4'-diaminodiphenyl ether crystals can be obtained continuously, thereby increasing the production capacity of 4,4'-diaminodiphenyl ether.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A 4,4'-diaminodiphenyl ether crystallization apparatus, comprising a crystallization tank (100) and a feeding mechanism (200), characterized in that, The crystallization tank (100) has two parallel partitions (101) evenly spaced inside, dividing the interior of the crystallization tank (100) into three crystallization chambers. Two feeding mechanisms (200) are rotatably disposed inside the crystallization tank (100), distributed in adjacent crystallization chambers. Each feeding mechanism (200) includes: A central horizontal shaft (201) is rotatably installed inside the crystallization tank (100); A cross (202) is rotatably mounted on the outer wall of a central horizontal shaft (201); Hinges (203) are hinged to the ends of the cross (202), and there are four hinges (203) arranged at equal angles between them; A scooping box (204) is fixedly installed on the surface of a hinge (203); Spring pins (205) are fixedly installed inside the cross (202), and there are four spring pins (205) in total. The positions of the four spring pins (205) correspond one-to-one with the positions of the four hinges (203). A tension spring (206) is fixedly installed between the hinge (203) and the spring pin (205); A shaped guide ring (207) is fixedly installed on one side of the partition (101) near the cross (202); An arc-shaped groove (208) is formed on the upper part of the outer wall of the irregular guide ring (207); Universal ball (209), the universal ball (209) is fixedly installed on one side of the scooping box (204) near the hinge (203) and at the end away from the hinge (203); The center of the irregular guide ring (207) is concentric with the center of the central horizontal shaft (201), and the top of the irregular guide ring (207) is provided with a smooth part. The arc-shaped groove (208) is opened on the smooth part of the top of the irregular guide ring (207), and there are multiple arc-shaped grooves (208) distributed at equal distances. The surface of the universal ball (209) abuts against the outer surface of the irregular guide ring (207). The feeding mechanism (200) further includes: Drainage holes (2015) are provided on one side of the scooping box (204) at equal intervals in both directions. Guide rod (2016), which is slidably mounted on the side of the scooping box (204) away from the drain hole (2015) via a linear bearing and extends into the interior of the scooping box (204); Gravity plate (2017), said gravity plate (2017) is fixedly installed at one end of the guide rod (2016) near the inside of the scooping box (204); Nut (2018), said nut (2018) is threadedly installed on the end of the guide rod (2016) away from the gravity plate (2017); A return spring (2019) is sleeved around the guide rod (2016) and fixedly installed between the scooping box (204) and the nut (2018); The protective sleeve (2020) is fixedly installed around the reset spring (2019) and the guide rod (2016).

2. The 4,4'-diaminodiphenyl ether crystallization apparatus according to claim 1, characterized in that, A hollow tube (2010) is fixedly installed on one side of the cross (202) near the irregular guide ring (207). The hollow tube (2010) is rotatably mounted on the periphery of the central horizontal shaft (201) via a bearing. The feeding mechanism (200) also includes: Planetary carrier (2011), which is fixedly installed on the outer wall of the hollow tube (2010) at the end away from the cross (202); Planetary gears (2012), which are rotatably mounted to a planet carrier (2011) via bearings, and there are three of them, with the three planetary gears (2012) being set at equal angles to each other; A sun gear (2013) is fixedly mounted on the outer wall of the central horizontal shaft (201) and located between three planetary gears (2012), the sun gear (2013) meshing with the three planetary gears (2012); An external gear ring (2014) is fixedly installed on one side of the partition plate (101) near the cross (202) and located inside the irregular guide ring (207). The external gear ring (2014) is located around the three planetary gears (2012) and meshes with the three planetary gears (2012).

3. The 4,4'-diaminodiphenyl ether crystallization apparatus according to claim 1, characterized in that, The feeding mechanism (200) further includes: The filling port (2021) is located on the side of the scooping box (204) away from the irregular guide ring (207); V-shaped springs (2022) are fixedly installed on the inner wall of the scooping box (204) near the filling port (2021), and there are multiple V-shaped springs (2022) arranged at equal angles. A round door (2023) is fixedly installed between multiple V-shaped spring pieces (2022) and located outside the opening of the filling port (2021). The surface of the round door (2023) abuts against the inner wall of the scooping box (204).

4. The 4,4'-diaminodiphenyl ether crystallization apparatus according to claim 3, characterized in that, A fixing sleeve (300) is fixedly installed on the outer wall of the central horizontal shaft (201). The fixing sleeve (300) is located at the end of the feeding mechanism (200) away from the partition (101). A plurality of stirring blades (301) are fixedly installed on the outer wall of the fixing sleeve (300) at equal angles. The stirring blades (301) are arranged in multiple rows along the axial direction of the fixing sleeve (300). The stirring blades (301) and the fixing sleeve (300) form a 60° angle.

5. The 4,4'-diaminodiphenyl ether crystallization apparatus according to claim 4, characterized in that, A power motor (500) is fixedly installed on the top of the crystallization tank (100). A drive sprocket (501) is fixedly installed on the output shaft of the power motor (500). A driven sprocket (502) is fixedly installed on one end of the central horizontal shaft (201) near the power motor (500). A chain (503) is sleeved between the driven sprocket (502) and the drive sprocket (501).

6. The 4,4'-diaminodiphenyl ether crystallization apparatus according to claim 5, characterized in that, A threaded conveyor plate (400) is fixedly installed on the outer wall of the central horizontal shaft (201) away from the power motor (500). The specifications of the threaded conveyor plate (400) are compatible with the specifications of the crystallization tank (100). A discharge port is opened at the bottom of the crystallization tank (100) near the threaded conveyor plate (400).

7. The 4,4'-diaminodiphenyl ether crystallization apparatus according to claim 6, characterized in that, A feed pipe (102) is fixedly installed at the top of the crystallization tank (100) near the power motor (500). The inside of the feed pipe (102) is connected to the inside of the crystallization tank (100), and a control valve is fixedly installed at the top of the feed pipe (102).

8. The 4,4'-diaminodiphenyl ether crystallization apparatus according to claim 7, characterized in that, Three hot air pipes (103) are fixedly installed at the top of the crystallization tank (100) at equal distances. The interior of the three hot air pipes (103) is connected to the interior of the crystallization tank (100), and the positions of the three hot air pipes (103) correspond one-to-one with the positions of the three crystallization chambers inside the crystallization tank (100).

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