Equipment cleaning wastewater treatment and re-discharge system and process for indolocarbazole production

Abstract

The invention relates to the technical field of wastewater treatment, and discloses an indolocarbazole production equipment cleaning wastewater treatment and re-discharge system and technology.The indolocarbazole production equipment cleaning wastewater treatment and re-discharge system comprises a treatment outer cylinder, a feeding bin is arranged at the top of the treatment outer cylinder, and a treatment inner cylinder is arranged on the inner side of the treatment outer cylinder; filter screen holes are formed in the treatment inner cylinder, an end cover is arranged at the end part of the treatment inner cylinder, and a discharge port is formed in the treatment outer cylinder. According to the equipment cleaning wastewater treatment and re-discharge system for indolocarbazole production, accurate injection of a medicament is realized through the flocculant adding assembly, and fine particles are quickly condensed into large flocs in combination with high-strength disturbance of the stirring assembly and the swinging assembly. And in the filtering stage, the unit time treatment capacity is obviously improved. And meanwhile, through linkage cleaning of the pushing assembly and the rotating assembly, it is ensured that the filter screen is always kept in an efficient and transparent state, shutdown cleaning caused by blockage of a traditional system is avoided, and the continuous operation stability is improved.

Description

A system and process for treating and discharging wastewater from equipment cleaning in the production of indolecarbazole. Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a system and process for treating and discharging wastewater from equipment cleaning in the production of indolecarbazole. Background Technology

[0002] Indole-carbazole, a key raw material for optoelectronic materials and pharmaceutical intermediates, produces wastewater with complex components during equipment cleaning. This wastewater contains unreacted indole and carbazole derivatives, as well as organic solvents such as toluene and DMF, along with residual metal catalysts and high-salt substances, resulting in high COD, high color, and strong biotoxicity. Direct discharge would severely pollute water bodies and soil, disrupt the ecological balance, and threaten the health of animals, plants, and humans. With increasingly stringent environmental regulations, this type of wastewater must undergo efficient treatment to meet standards before discharge, reducing environmental risks and aligning with green production and sustainable development requirements, making it a crucial issue for environmental governance in the industry. Treatment of this wastewater requires wastewater treatment equipment. However, existing equipment has the following drawbacks: The initial wastewater contains particulate impurities, which, if left untreated, can lead to frequent blockages, wear, or significant performance reductions in the core equipment of subsequent treatment units. Suspended particulate matter and fibrous impurities in the wastewater adhere to the surfaces of pipes, filter membranes, and reactor packing, gradually forming a buildup that hinders uniform contact between water and reagents, reducing mass transfer efficiency. Meanwhile, high concentrations of viscous impurities may coat catalysts or microbial communities, inhibiting their activity and significantly weakening the efficiency of oxidation, degradation, and other reactions. This not only increases the frequency and cost of equipment maintenance but also leads to unstable operation of the treatment system, fluctuations in effluent quality, and even exceeding standards. In severe cases, it may require shutdown for cleaning, directly affecting treatment efficiency and the reliability of achieving discharge standards.

[0003] After treating this type of wastewater, sediment accumulates on the filter screen, gradually clogging the pores and causing a sharp increase in wastewater flow resistance, resulting in a significant decrease in the treatment system's flow rate. This not only reduces the amount of wastewater treated per unit time, affecting treatment efficiency, but also causes increased pressure before the filter due to obstructed water flow, potentially leading to operational risks such as pipe leaks and equipment overload. Furthermore, the long-term accumulation of trapped sediment can breed anaerobic microorganisms, producing foul-smelling gases that pollute the surrounding environment. Additionally, some undegraded toxic pollutants may penetrate the clogged filter screen with the water flow, causing the effluent quality to exceed standards, violating the original purpose of wastewater treatment and increasing environmental compliance risks and subsequent treatment costs. Summary of the Invention

[0004] Given that existing technologies have problems such as untreated particulate impurities in wastewater clogging and wearing out equipment, inhibiting reactions, increasing costs, and affecting compliance, and that untreated sediment on the treated filter screen can obstruct flow, breed microorganisms, and cause effluent to exceed standards, thus increasing environmental risks and costs, a wastewater treatment and re-discharge system for indolecarbazole production equipment cleaning is proposed.

[0005] This application provides a wastewater treatment and discharge system for equipment cleaning in the production of indolecarbazole. The purpose is to: effectively treat particulate impurities in the wastewater to avoid clogging, wear and tear on subsequent equipment and inhibited reaction; at the same time, promptly remove sediment from the filter screen to prevent obstruction of flow, microbial growth and excessive effluent, reduce costs and environmental risks, and achieve compliant wastewater discharge.

[0006] The technical solution of this invention is as follows: a wastewater treatment and discharge system for equipment cleaning in indolecarbazole production, comprising an outer treatment cylinder, a feed hopper at the top of the outer treatment cylinder, an inner treatment cylinder inside the outer treatment cylinder, a filter screen on the inner treatment cylinder, an end cap at the end of the inner treatment cylinder, and a discharge port on the outer treatment cylinder; and an auxiliary filtration component disposed on the outer treatment cylinder; the auxiliary filtration component includes a stirring assembly disposed on the inner treatment cylinder, and a pushing assembly disposed on the stirring assembly; the auxiliary filtration component is used to stir the wastewater in the inner treatment cylinder and remove sediment from the filter screen; the stirring assembly includes a stirring cylinder disposed on the inner treatment cylinder, the stirring cylinder being rotatably connected to the outer treatment cylinder, multiple stirring rods symmetrically distributed on the stirring cylinder, an arc-shaped opening on the stirring cylinder, and an arc-shaped pusher plate at the bottom of the stirring cylinder, the arc-shaped pusher plate being in contact with the inner wall of the inner treatment cylinder.

[0007] Furthermore, the pushing assembly includes a first reciprocating screw disposed inside the mixing drum, the first reciprocating screw being rotatably connected to the outer processing drum, a first nut being disposed on the first reciprocating screw, a smooth rod being disposed on the first nut, the smooth rod being fixedly connected to the outer processing drum, a pushing rod being disposed at the bottom of the first nut, the pushing rod being slidably connected to the inner side of the arc-shaped opening, and the pushing rod being fixedly connected to the arc-shaped pusher plate.

[0008] Furthermore, the auxiliary filtration component also includes a swing assembly disposed on the outer processing cylinder, a rotating assembly disposed on the pushing assembly, and a pushing assembly and a driving assembly disposed on the swing assembly; the swing assembly includes a U-shaped plate disposed on the outer processing cylinder, a second reciprocating screw disposed inside the U-shaped plate, a second nut disposed on the second reciprocating screw, the second nut being slidably connected to the U-shaped plate, a swing rod disposed on the second nut, a first spiral groove disposed on the stirring cylinder, and the swing rod being slidably connected to the inner side of the spiral groove.

[0009] Furthermore, the rotating assembly includes a rotating column disposed on the first reciprocating lead screw, a second helical groove disposed on the rotating column, a vertical groove disposed on the rotating column communicating with the second helical groove, a first rubber wedge block disposed inside the vertical groove, a second rubber wedge block disposed inside the second helical groove, and the same rotating rod disposed inside the second helical groove and the vertical groove, the rotating rod being slidably connected to the inclined surfaces of the first rubber wedge block and the second rubber wedge block respectively, and the rotating rod being slidably connected to the U-shaped plate.

[0010] Furthermore, the pushing assembly includes a third reciprocating screw mounted on the U-shaped plate, a third nut mounted on the third reciprocating screw, the third nut being slidably connected to the U-shaped plate, and the third nut being fixedly connected to the rotating rod.

[0011] Furthermore, the drive assembly includes a drive shaft disposed within the second and third reciprocating lead screws, a drive motor disposed on the U-shaped plate, the output shaft of the drive motor being fixedly connected to the drive shaft, helical teeth arranged in a circular array within both the second and third reciprocating lead screws, with the inclination directions of the two sets of helical teeth being staggered, two drive rods disposed on the drive shaft, each drive rod having a first inclined surface, with the two sets of first inclined surfaces facing opposite directions, the drive rods meshing with corresponding sets of helical teeth, two movable slots symmetrically distributed on the drive shaft, the drive rods slidingly connected to the inner side of the movable slots, and a spring disposed between the drive rods and the inner wall of the movable slots.

[0012] Furthermore, it also includes a scraping assembly, which includes arc-shaped scraping plates disposed on both sides of the inner processing cylinder. Each of the two arc-shaped scraping plates is provided with a guide plate, and both guide plates are fixedly connected to the inner wall of the outer processing cylinder. Each of the two arc-shaped scraping plates is provided with a second inclined surface at its top.

[0013] Furthermore, it also includes a flocculant addition component, which includes a fixing ring disposed on the inner processing cylinder, a feed inlet disposed on the inner processing cylinder, and an addition chamber disposed on the outer processing cylinder, the addition chamber passing through the fixing ring and communicating with the inside of the feed inlet.

[0014] Another objective of this invention is to provide a process for treating and discharging wastewater from equipment cleaning in indolecarbazole production, comprising the following steps: S1: Wastewater from equipment cleaning in indolecarbazole production enters the inner treatment cylinder from the feed hopper. At this time, the filter screen of the inner treatment cylinder faces upward, and the wastewater is temporarily stored inside the cylinder. Simultaneously, the flocculant addition component is activated, and the agent in the addition hopper is injected through the connection channel between the fixed ring and the feed inlet of the inner treatment cylinder. The agent initially contacts the wastewater, preparing for subsequent flocculation reaction; S2: The stirring component and the oscillating component of the auxiliary filtration unit work together. The stirring cylinder oscillates periodically in both forward and reverse directions under the drive of the oscillating component. The second reciprocating screw in the U-shaped plate rotates, driving the second nut and the oscillating rod to reciprocate. The oscillating rod forces the stirring cylinder to oscillate through the first spiral groove of the stirring cylinder, thereby creating a strong disturbance to the wastewater. At the same time, the drive component drives the second reciprocating screw to rotate through the forward rotation of the drive shaft, ensuring that the oscillation frequency matches the stirring intensity, so that the agent and the wastewater are fully mixed. S3: After the flocculation reaction is completed, the drive mechanism drives the inner cylinder to rotate, causing the filter screen to turn to the bottom. The wastewater passes through the filter screen under gravity. The filtered water enters the gap between the outer cylinder and the inner cylinder and is finally discharged from the discharge port for collection. At this time, impurities and flocs are trapped on the inner wall of the inner cylinder and the filter screen. The scraping component starts to work. When the inner cylinder rotates, the arc-shaped scraping plates on both sides scrape off the remaining impurities on the outer wall. The impurities slide along the guide plate to the discharge port for centralized treatment, avoiding secondary pollution of the filtrate by impurities. S4: After filtration is completed, the push component and the rotating component start to clean the filter screen. In the rotating component, the third reciprocating screw rotates under the reverse drive of the drive shaft of the drive component. The third nut drives the rotating rod to slide back and forth. The rotating rod drives the first reciprocating screw to rotate through the second spiral groove and vertical groove of the rotating column. The first nut moves back and forth along the smooth rod. Through the push rod, the arc-shaped pusher plate slides along the inner wall of the inner cylinder, completely scraping off the sediment on the filter screen.

[0015] Furthermore, in step S4, when the precipitate is pushed to the end cap, the end cap is pushed open by the force of the torsion spring, and the impurities are discharged from the opening. After the entire cleaning action is completed, the end cap is reset under the action of the torsion spring, and the system returns to the state of waiting for processing, ensuring efficient operation of the next round of processing.

[0016] The beneficial effects of this invention are as follows: Precise injection of the flocculant is achieved through the flocculant addition component. Combined with the high-intensity agitation of the stirring and oscillating components, the flocculant and wastewater are thoroughly mixed, causing fine particles to rapidly agglomerate into large flocs, thus increasing the sedimentation rate of impurities. In the filtration stage, the filter screen's directional design within the treatment cylinder, coupled with the real-time cleaning of the scraping component, reduces the obstruction to filtration caused by impurities, significantly increasing the throughput per unit time. Simultaneously, the coordinated cleaning of the pushing and rotating components ensures that the filter screen remains highly efficient and permeable, avoiding downtime for cleaning due to clogging in traditional systems and improving continuous operational stability.

[0017] Through the synergistic effect of reagents and agitation, indole, carbazole derivatives, and heavy metal ions in wastewater are efficiently removed. The filtration and separation process relies on filter screen retention and secondary cleaning by a scraping assembly to prevent impurities from penetrating the filter and contaminating the filtrate. The fully automated impurity discharge design in the cleaning stage prevents secondary leaching of sediments and water pollution. Actual measurements show that the treated wastewater has a lower COD value and heavy metal residues are far below emission standards, completely resolving the issues of fluctuating effluent and excessive toxicity in traditional treatment processes, and effectively mitigating environmental compliance risks.

[0018] The reciprocating scraping action of the pushing and rotating components reduces equipment wear caused by filter clogging, extending filter life. The drive component achieves multi-component linkage through forward and reverse switching, reducing the need for independent drive units and energy consumption, thus lowering power consumption. Furthermore, the automatic opening and closing of the end caps and the directional slag discharge design of the guide plate reduce the frequency of manual cleaning, saving maintenance hours annually. Simultaneously, it avoids production losses due to equipment failure, creating a stable production environment for the company. Attached Figure Description

[0019] Figure 1 is a first-view perspective three-dimensional structural diagram of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to the present invention; Figure 2 is a second-view perspective three-dimensional structural diagram of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to the present invention; Figure 3 is a cross-sectional structural diagram of the outer treatment cylinder of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to the present invention; Figure 4 is a structural diagram of the inner treatment cylinder of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to the present invention; Figure 5 is a cross-sectional structural diagram of the inner treatment cylinder of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to the present invention; Figure 6 is a structural diagram of the stirring assembly of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to the present invention; Figure 7 is a structural diagram of the pushing assembly of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to the present invention. Figure 8 is a schematic diagram of the swing component structure of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production of the present invention; Figure 9 is a schematic diagram of the rotating component structure of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production of the present invention; Figure 10 is a schematic diagram of the pushing component structure of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production of the present invention; Figure 11 is a schematic diagram of the driving component structure of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production of the present invention; Figure 12 is a partial structural schematic diagram of the driving component structure of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production of the present invention; Figure 13 is a cross-sectional structural schematic diagram of the driving component structure of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production of the present invention; Figure 14 is a schematic diagram of the scraping component structure of the equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production of the present invention.

[0020] In the diagram: 1. Outer processing cylinder; 11. Feed hopper; 12. Inner processing cylinder; 13. End cap; 14. Discharge port; 2. Mixing assembly; 21. Mixing drum; 22. Mixing rod; 23. Arc-shaped opening; 24. Arc-shaped pusher plate; 3. Pushing assembly; 31. First reciprocating screw; 32. First nut; 33. Smooth rod; 34. Pushing rod; 4. Swinging assembly; 41. U-shaped plate; 42. Second reciprocating screw; 43. Second nut; 44. Swinging rod; 5. Rotating assembly; 51. Rotating... 52. Column; 53. Second spiral groove; 54. Vertical groove; 55. First rubber wedge block; 56. Second rubber wedge block; 57. Rotating rod; 68. Pushing assembly; 69. Third reciprocating screw; 60. Third nut; 71. Drive assembly; 72. Drive shaft; 73. Drive motor; 74. Helical gear; 75. Drive rod; 76. Movable groove; 87. Spring; 98. Scraper assembly; 89. Arc-shaped scraper; 80. Guide plate; 91. Flocculant addition assembly; 92. Fixing ring; 93. Addition bin. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Example 1, referring to Figures 1-7, is the first embodiment of the present invention, providing a system for treating and discharging wastewater from equipment cleaning in the production of indolecarbazole. The system includes an outer processing cylinder 1, a feed hopper 11 fixedly connected to the top of the outer processing cylinder 1, an inner processing cylinder 12 rotatably connected to the inner side of the outer processing cylinder 1, a filter screen on the inner processing cylinder 12, an end cap 13 hinged to the end of the inner processing cylinder 12, and a discharge port 14 on the outer processing cylinder 1. It also includes an auxiliary filtration component installed on the outer processing cylinder 1; the auxiliary filtration component includes components installed on the inner processing cylinder 12. The stirring assembly 2 is equipped with a pushing assembly 3; the auxiliary filtration component is used to stir the wastewater in the inner processing cylinder 12 and remove the sediment on the filter screen; the stirring assembly 2 includes a stirring cylinder 21 rotatably connected to the inner processing cylinder 12, the stirring cylinder 21 is rotatably connected to the outer processing cylinder 1, multiple stirring rods 22 are symmetrically distributed and fixedly connected on the stirring cylinder 21, an arc-shaped opening 23 is opened on the stirring cylinder 21, and an arc-shaped pusher plate 24 is slidably connected to the bottom of the stirring cylinder 21, the arc-shaped pusher plate 24 is in contact with the inner wall of the inner processing cylinder 12.

[0023] Specifically, the wastewater from the equipment cleaning process in indolecarbazole production enters the inner processing cylinder 12 from the feed hopper 11. The inner processing cylinder 12 rotates under the action of the drive mechanism, using the filter screen on the cylinder wall to initially filter the wastewater. Particulate impurities and fibrous impurities in the water are trapped on the surface of the inner processing cylinder 12, and the filtered wastewater flows into the inner processing cylinder 12. At this time, the filter screen is located at the top of the inner processing cylinder 12, allowing the wastewater to remain inside. The stirring assembly 2 is then activated, and under the action of the stirring drum 21, the stirring rod 22 swings, stirring the wastewater in the inner processing cylinder 12 to ensure thorough mixing of the wastewater and the reagent. Then, the drive mechanism drives the inner processing cylinder 12 to rotate again, causing the filter screen to rotate to the bottom of the inner processing cylinder 12, where it filters the wastewater, removing any precipitates formed after the wastewater and reagent are mixed. The filtered water in the inner processing cylinder 12 falls into the outer processing cylinder 1 and is discharged from the discharge port 14 for collection. After the wastewater in the inner cylinder 12 has completely flowed out, sediment will adhere to the filter screen. At this point, the pushing component 3 is activated, causing the arc-shaped pusher plate 24 to slide on the inner surface of the inner cylinder 12, pushing the sediment towards the end of the inner cylinder 12 near the end cap 13. The end cap 13 is hinged to the inner cylinder 12, and a torsion spring is fitted on the hinge shaft to prevent the end cap 13 from being opened arbitrarily. When the sediment moves to the end cap 13, it causes the end cap 13 to rotate, the torsion spring to deform and twist, and the end cap 13 is opened, allowing the sediment to be discharged from the open end of the inner cylinder 12. This achieves automatic cleaning of the filter screen. It solves the problem of initial impurities affecting subsequent treatment and avoids filter clogging, ensuring stable and efficient system operation.

[0024] Referring to Figures 5 and 7, the pushing assembly 3 includes a first reciprocating screw 31 rotatably connected inside the mixing drum 21. The first reciprocating screw 31 is rotatably connected to the outer processing drum 1. A first nut 32 is threaded onto the first reciprocating screw 31. A smooth rod 33 is slidably connected onto the first nut 32. The smooth rod 33 is fixedly connected to the outer processing drum 1. A pushing rod 34 is fixedly connected to the bottom of the first nut 32. The pushing rod 34 is slidably connected to the inner side of the arc-shaped opening 23. The pushing rod 34 is fixedly connected to the arc-shaped pusher plate 24.

[0025] Specifically, when the push assembly 3 operates, the first reciprocating screw 31 rotates. Because the first nut 32 is threadedly connected to the screw and limited by the guide rod 33, it reciprocates axially along the guide rod 33. The first nut 32, through the push rod 34 fixed at the bottom, drives the arc-shaped pusher plate 24 to move synchronously. The push rod 34 slides along the inner side of the arc-shaped opening 23, ensuring that the arc-shaped pusher plate 24 always fits tightly against the inner wall of the inner processing cylinder 12. The arc-shaped pusher plate 24 can completely scrape off the deposits adhering to the surface of the filter screen pores, preventing pore blockage. The scraped impurities are discharged through the end cap 13 or the discharge port 14, achieving continuous cleaning of the filter screen and ensuring stable filtration efficiency.

[0026] Example 2, referring to Figures 8-13, is the second embodiment of the present invention. This embodiment differs from the first embodiment in that: the auxiliary filtration component further includes a swing assembly 4 installed on the outer processing cylinder 1, a rotating assembly 5 is installed on the pushing assembly 3, and a pushing assembly 6 and a driving assembly 7 are installed on the swing assembly 4; the swing assembly 4 includes a U-shaped plate 41 fixedly connected to the outer processing cylinder 1, a second reciprocating screw 42 rotatably connected inside the U-shaped plate 41, a second nut 43 threadedly connected to the second reciprocating screw 42, the second nut 43 being slidably connected to the U-shaped plate 41, a swing rod 44 fixedly connected to the second nut 43, a first spiral groove is opened on the stirring cylinder 21, and the swing rod 44 is slidably connected to the inner side of the first spiral groove.

[0027] Specifically, when the oscillating assembly 4 is working, the second reciprocating screw 42 rotates within the U-shaped plate 41. Since the second nut 43 is slidably connected to the U-shaped plate 41 and threadedly engaged with the second reciprocating screw 42, the second nut 43 will reciprocate linearly along the guiding direction of the U-shaped plate 41. As the second nut 43 moves, the oscillating rod 44 fixed at its top reciprocates synchronously, with the end of the oscillating rod 44 away from the second nut 43 embedded in the first spiral groove on the outer wall of the mixing drum 21. When the oscillating rod 44 moves linearly back and forth, the spiral structure of the first spiral groove generates a circumferential force on the oscillating rod 44, forcing the mixing drum 21 to periodically oscillate in both directions around its own axis. This oscillating motion enhances the disturbance effect of the mixing rod 22 on the wastewater within the mixing drum 21, allowing the wastewater to mix more thoroughly with the reagents in the treatment inner drum 12. This promotes the sufficient sedimentation of toxic and harmful substances in the wastewater, ensuring that the treated water quality meets normal discharge standards.

[0028] Referring to Figures 8 and 9, the rotating assembly 5 includes a rotating column 51 fixedly connected to the first reciprocating lead screw 31. A second spiral groove 52 is formed on the rotating column 51. A vertical groove 53 is formed on the rotating column 51 in communication with the second spiral groove 52. A first rubber wedge block 54 is fixedly connected to the inner side of the vertical groove 53. A second rubber wedge block 55 is fixedly connected to the inner side of the second spiral groove 52. The same rotating rod 56 is slidably connected to the inner sides of the second spiral groove 52 and the vertical groove 53. The rotating rod 56 is slidably connected to the inclined surfaces of the first rubber wedge block 54 and the second rubber wedge block 55 respectively. The rotating rod 56 is slidably connected to the U-shaped plate 41.

[0029] Specifically, the rotating rod 56 slides on the U-shaped plate 41. Under the action of the first rubber wedge block 54, the rotating rod 56 smoothly enters the second spiral groove 52 from the vertical groove 53. Under the action of the second spiral groove 52, the rotating column 51 rotates, driving the first reciprocating screw 31 to rotate. Under the action of the second rubber wedge block 55, the rotating rod 56 smoothly slides from the second spiral groove 52 into the vertical groove 53, at which point the rotating column 51 stops rotating. By the reciprocating sliding of the rotating rod 56 on the U-shaped plate 41, the rotating column 51 is continuously rotated in one direction, driving the first reciprocating screw 31 to rotate in the same direction, achieving the effect of cleaning the sediment on the filter screen and ensuring the stable operation of the wastewater treatment system.

[0030] Referring to Figures 10 and 11, the push assembly 6 includes a third reciprocating screw 61 rotatably connected to the U-shaped plate 41, a third nut 62 threadedly connected to the third reciprocating screw 61, the third nut 62 being slidably connected to the U-shaped plate 41, and the third nut 62 being fixedly connected to the rotating rod 56.

[0031] Specifically, when the third reciprocating screw 61 rotates, the third nut 62 slides back and forth along the surface of the third reciprocating screw 61 because it is slidably connected to the U-shaped plate 41, which in turn drives the rotating rod 56 to slide back and forth.

[0032] Referring to Figures 11-13, the drive assembly 7 includes a drive shaft 71 rotatably connected within the second reciprocating lead screw 42 and the third reciprocating lead screw 61. A drive motor 72 is fixedly connected to the U-shaped plate 41, and the output shaft of the drive motor 72 is fixedly connected to the drive shaft 71. Helical teeth 73 are fixedly connected in a circular array within both the second reciprocating lead screw 42 and the third reciprocating lead screw 61, and the inclination directions of the two sets of helical teeth 73 are staggered. Two drive rods 74 are slidably connected to the drive shaft 71. Each of the two drive rods 74 has a first inclined surface, and the two sets of first inclined surfaces face opposite directions. The drive rods 74 are meshed with the corresponding sets of helical teeth 73. Two movable grooves 75 are symmetrically distributed on the drive shaft 71. The drive rods 74 are slidably connected to the inner side of the movable grooves 75, and a spring 76 is fixedly connected between the drive rods 74 and the inner wall of the movable grooves 75.

[0033] Specifically, when the drive assembly 7 is working, the drive motor 72 starts, and its output shaft drives the drive shaft 71 to rotate synchronously within the second reciprocating lead screw 42 and the third reciprocating lead screw 61. When the drive shaft 71 rotates, it drives two drive rods 74 to rotate together via the movable groove 75. The first inclined surface on the drive rod 74 meshes with the helical teeth 73 within the second reciprocating lead screw 42 and the third reciprocating lead screw 61. Because the two sets of helical teeth 73 are inclined in opposite directions, when the drive rod 74 rotates, it generates an axial thrust on the helical teeth 73 on both sides. Under the elastic action of the spring 76, the drive rod 74 can slide elastically along the movable groove 75, ensuring that the first inclined surface and the helical teeth 73 always remain engaged. When the drive shaft 71 rotates in the forward direction, the first inclined surface of one drive rod 74 engages with the corresponding helical teeth 73, driving the second reciprocating lead screw 42 to rotate; when rotating in the reverse direction, the first inclined surface of the other drive rod 74 engages with another set of helical teeth 73, driving the third reciprocating lead screw 61 to operate. By switching the drive shaft 71 to forward or reverse, the second reciprocating lead screw 42 and the third reciprocating lead screw 61 can be driven respectively, realizing independent control of the swing assembly 4 and the push assembly 6. The rest of the structure is the same as that of Embodiment 1.

[0034] Example 3, referring to Figure 14, is the third embodiment of the present invention. This embodiment differs from the second embodiment in that it also includes a scraping assembly 8. The scraping assembly 8 includes arc-shaped scraping plates 81 that are slidably connected to both sides of the inner processing cylinder 12. Guide plates 82 are fixedly connected to both arc-shaped scraping plates 81. Both guide plates 82 are fixedly connected to the inner wall of the outer processing cylinder 1. A second inclined surface is opened on the top of both arc-shaped scraping plates 81.

[0035] Specifically, during the operation of the scraping assembly 8, the outer wall of the inner processing cylinder 12 continuously contacts the arc-shaped scraper plates 81 on both sides as the inner cylinder rotates. The arc-shaped scraper plates 81 adhere to the outer surface of the inner processing cylinder 12. When the inner cylinder rotates, residual particulate impurities adhering to the outer wall are scraped off by the arc-shaped scraper plates 81, preventing impurities from accumulating on the cylinder wall and affecting subsequent filtration. The scraped-off particulate impurities slide down the surface of the arc-shaped scraper plates 81 and fall onto the guide plate 82, which is fixedly connected to them. The guide plate 82 is fixed to the inner wall of the outer processing cylinder 1, and its tilt angle guides the sediment towards the discharge port 14 for easy collection and cleaning. Furthermore, the second inclined surface at the top of the arc-shaped scraper plate 81 reduces the accumulation of particulate impurities at the arc-shaped scraper plate 81, ensuring efficient filtration of the inner processing cylinder 12 while preventing particulate impurities on the surface of the inner processing cylinder 12 from falling into the outer processing cylinder 1.

[0036] Referring to Figure 3, the system also includes a flocculant addition component 9. The flocculant addition component 9 includes a fixing ring 91 rotatably connected to the inner processing cylinder 12. The inner processing cylinder 12 is also provided with a feed inlet. An addition chamber 92 is fixedly connected to the outer processing cylinder 1. The addition chamber 92 passes through the fixing ring 91 and communicates with the inside of the feed inlet.

[0037] Specifically, when the filter mesh of the inner treatment cylinder 12 faces upwards, the addition chamber 92 is connected to the feed inlet. At this time, wastewater is added into the inner treatment cylinder 12, and the reagent is added into the inner treatment cylinder 12 through the addition chamber 92. After the reagent enters the inner treatment cylinder 12, it is thoroughly mixed with the wastewater agitated by the stirring component 2, causing fine particulate impurities in the water to agglomerate into larger flocs, which are easier to intercept through the filter mesh later. This process enhances the impurity separation effect, improves filtration efficiency, and further ensures the thoroughness of wastewater treatment, laying the foundation for achieving discharge standards. The remaining structure is the same as that in Example 2.

[0038] Based on embodiments 1-3, the working principle of the present invention is as follows: Wastewater from the equipment cleaning process in indolecarbazole production enters the processing inner cylinder 12 from the feed hopper 11. At this time, the filter mesh of the processing inner cylinder 12 faces upwards, and the wastewater is temporarily stored inside the cylinder. Simultaneously, the flocculant addition component 9 is activated, and the agent in the addition hopper 92 is injected through the connection channel between the fixing ring 91 and the feed inlet of the processing inner cylinder 12. The agent initially contacts the wastewater, preparing for the subsequent flocculation reaction. The stirring component 2 and the oscillating component 4 of the auxiliary filtration unit work together. The stirring cylinder 21 oscillates periodically in both directions under the drive of the oscillating component 4. The second reciprocating screw 42 inside the U-shaped plate 41 rotates, driving the second nut 43 and the oscillating rod 44 to reciprocate. The oscillating rod 44 forces the stirring cylinder 21 to oscillate through the first spiral groove of the stirring cylinder 21, thereby creating a strong disturbance to the wastewater. Simultaneously, the drive assembly 7 drives the second reciprocating screw 42 to rotate via the drive shaft 71, ensuring that the oscillation frequency matches the stirring intensity, allowing the reagent and wastewater to mix thoroughly, and fine particles to agglomerate into larger flocs. After the flocculation reaction is complete, the drive mechanism drives the inner processing cylinder 12 to rotate, causing the filter screen to turn to the bottom. The wastewater passes through the filter screen under gravity, and the filtered water enters the gap between the outer processing cylinder 1 and the inner cylinder, finally being discharged and collected from the discharge port 14. At this time, impurities and flocs are trapped on the inner wall of the inner processing cylinder 12 and on the filter screen. The scraping assembly 8 starts working. When the inner processing cylinder 12 rotates, the arc-shaped scraper plates 81 on both sides scrape off the remaining impurities on the outer wall. The impurities slide along the guide plate 82 to the discharge port 14 for centralized treatment, avoiding secondary contamination of the filtrate by impurities. After filtration is completed, the push assembly 3 and the rotating assembly 5 start cleaning the filter screen. In the rotating assembly 5, the third reciprocating screw 61 operates under the drive assembly 7 (drive shaft 71 reverses), and the third nut 62 drives the rotating rod 56 to slide back and forth. The rotating rod 56 drives the first reciprocating screw 31 to rotate through the second spiral groove 52 and vertical groove 53 of the rotating column 51. The first nut 32 reciprocates along the smooth rod 33, and drives the arc-shaped pusher plate 24 to slide along the inner wall of the processing inner cylinder 12 through the push rod 34, thoroughly scraping away the sediment on the filter screen holes. When the sediment is pushed to the end cover 13, the end cover 13 is pushed open by the force overcoming the torsion spring force, and the impurities are discharged from the opening end. After the entire cleaning action is completed, the end cover 13 is reset under the action of the torsion spring, and the system returns to the waiting state to ensure efficient operation of the next round of processing.

[0039] Example 4, referring to Figures 1-14, is the fourth embodiment of the present invention, providing a process for treating and discharging wastewater from equipment cleaning in the production of indolecarbazole, including the following steps: S1: Wastewater from equipment cleaning in the production of indolecarbazole enters the treatment inner cylinder 12 from the feed hopper 11. At this time, the filter screen of the treatment inner cylinder 12 faces upward, and the wastewater is temporarily stored in the cylinder. At the same time, the flocculant addition component 9 is activated, and the agent in the addition hopper 92 is injected through the connection channel between the fixing ring 91 and the feed inlet of the treatment inner cylinder 12. The agent initially contacts the wastewater, preparing for the subsequent flocculation reaction.

[0040] S2: The stirring assembly 2 and the oscillating assembly 4 of the auxiliary filtration component work together. The stirring drum 21 oscillates periodically in both directions under the drive of the oscillating assembly 4. The second reciprocating screw 42 inside the U-shaped plate 41 rotates, driving the second nut 43 and the oscillating rod 44 to reciprocate. The oscillating rod 44 forces the stirring drum 21 to oscillate through the first spiral groove of the stirring drum 21. The stirring rod 22 then creates a strong disturbance to the wastewater. At the same time, the drive assembly 7 drives the second reciprocating screw 42 to rotate through the drive shaft 71, ensuring that the oscillation frequency matches the stirring intensity, so that the reagent and wastewater are fully mixed and the fine particles are agglomerated into larger flocs.

[0041] S3: After the flocculation reaction is completed, the drive mechanism drives the inner cylinder 12 to rotate, causing the filter screen to turn to the bottom. The wastewater passes through the filter screen under the action of gravity. The filtered water enters the gap between the outer cylinder 1 and the inner cylinder and is finally discharged and collected from the discharge port 14. At this time, impurities and flocs are trapped on the inner wall of the inner cylinder 12 and the filter screen. The scraping assembly 8 starts to work. When the inner cylinder 12 rotates, the arc-shaped scraper plates 81 on both sides scrape off the residual impurities on the outer wall. The impurities slide along the guide plate 82 to the discharge port 14 for centralized treatment, avoiding secondary pollution of the filtrate by impurities.

[0042] S4: After filtration, the push assembly 3 and the rotating assembly 5 start cleaning the filter screen. In the rotating assembly 5, the third reciprocating screw 61 rotates under the reverse drive of the drive shaft 71 of the drive assembly 7. The third nut 62 drives the rotating rod 56 to slide back and forth. The rotating rod 56 drives the first reciprocating screw 31 to rotate through the second spiral groove 52 and vertical groove 53 of the rotating column 51. The first nut 32 moves back and forth along the smooth rod 33. Through the push rod 34, the arc-shaped pusher plate 24 slides along the inner wall of the processing inner cylinder 12 to completely scrape off the sediment on the filter screen holes. When the sediment is pushed to the end cover 13, the end cover 13 is pushed to overcome the torsion spring force and opens. The impurities are discharged from the opening end. After the entire cleaning action is completed, the end cover 13 is reset under the action of the torsion spring, and the system returns to the waiting state to ensure efficient operation of the next round of processing.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A system for treating and discharging wastewater from equipment cleaning in the production of indolecarbazole, comprising an outer treatment cylinder (1), a feed hopper (11) at the top of the outer treatment cylinder (1), an inner treatment cylinder (12) inside the outer treatment cylinder (1), a filter screen on the inner treatment cylinder (12), an end cap (13) at the end of the inner treatment cylinder (12), and a discharge port (14) on the outer treatment cylinder (1), characterized in that, It also includes an auxiliary filtration component installed on the outer processing cylinder (1); the auxiliary filtration component includes a stirring assembly (2) installed on the inner processing cylinder (12), and a pushing assembly (3) is installed on the stirring assembly (2); the auxiliary filtration component is used to stir the wastewater in the inner processing cylinder (12) and remove the sediment on the filter screen; the stirring assembly (2) includes a stirring cylinder (21) installed on the inner processing cylinder (12), the stirring cylinder (21) is rotatably connected to the outer processing cylinder (1), multiple stirring rods (22) are symmetrically distributed on the stirring cylinder (21), an arc-shaped opening (23) is provided on the stirring cylinder (21), and an arc-shaped pusher plate (24) is provided at the bottom of the stirring cylinder (21), and the arc-shaped pusher plate (24) is attached to the inner wall of the inner processing cylinder (12).

2. The equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to claim 1, characterized in that, The pushing assembly (3) includes a first reciprocating screw (31) disposed in the mixing drum (21), the first reciprocating screw (31) being rotatably connected to the processing outer drum (1), a first nut (32) being disposed on the first reciprocating screw (31), a smooth rod (33) being disposed on the first nut (32), the smooth rod (33) being fixedly connected to the processing outer drum (1), a pushing rod (34) being disposed at the bottom of the first nut (32), the pushing rod (34) being slidably connected to the inner side of the arc-shaped opening (23), and the pushing rod (34) being fixedly connected to the arc-shaped pusher plate (24).

3. The equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to claim 2, characterized in that, The auxiliary filtration component also includes a swing assembly (4) disposed on the outer processing cylinder (1), a rotating assembly (5) disposed on the pushing assembly (3), and a pushing assembly (6) and a driving assembly (7) disposed on the swing assembly (4); the swing assembly (4) includes a U-shaped plate (41) disposed on the outer processing cylinder (1), a second reciprocating screw (42) disposed inside the U-shaped plate (41), a second nut (43) disposed on the second reciprocating screw (42), the second nut (43) being slidably connected to the U-shaped plate (41), a swing rod (44) disposed on the second nut (43), a first spiral groove disposed on the stirring cylinder (21), and the swing rod (44) being slidably connected to the inner side of the spiral groove.

4. The equipment cleaning wastewater treatment and discharge system for indolecarbazole production according to claim 3, characterized in that, The rotating assembly (5) includes a rotating column (51) mounted on a first reciprocating screw (31). A second spiral groove (52) is provided on the rotating column (51). A vertical groove (53) is provided on the rotating column (51) in communication with the second spiral groove (52). A first rubber wedge block (54) is provided inside the vertical groove (53). A second rubber wedge block (55) is provided inside the second spiral groove (52). The same rotating rod (56) is provided inside the second spiral groove (52) and the vertical groove (53). The rotating rod (56) is slidably connected to the inclined surfaces of the first rubber wedge block (54) and the second rubber wedge block (55) respectively. The rotating rod (56) is slidably connected to the U-shaped plate (41).

5. The equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to claim 4, characterized in that, The pushing assembly (6) includes a third reciprocating screw (61) disposed on a U-shaped plate (41), a third nut (62) disposed on the third reciprocating screw (61), the third nut (62) being slidably connected to the U-shaped plate (41), and the third nut (62) being fixedly connected to the rotating rod (56).

6. The equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to claim 5, characterized in that, The drive assembly (7) includes a drive shaft (71) disposed in the second reciprocating screw (42) and the third reciprocating screw (61). A drive motor (72) is disposed on the U-shaped plate (41). The output shaft of the drive motor (72) is fixedly connected to the drive shaft (71). Helical teeth (73) are arranged in a ring array in both the second reciprocating screw (42) and the third reciprocating screw (61), and the inclination directions of the two sets of helical teeth (73) are staggered. Two drive rods (74) are disposed on the drive shaft (71). A first inclined surface is disposed on both drive rods (74), and the two sets of first inclined surfaces face opposite directions. The drive rods (74) are meshed with the corresponding sets of helical teeth (73). Two movable grooves (75) are symmetrically distributed on the drive shaft (71). The drive rods (74) are slidably connected to the inner side of the movable grooves (75). A spring (76) is disposed between the drive rods (74) and the inner wall of the movable grooves (75).

7. The equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to claim 6, characterized in that, It also includes a scraping assembly (8), which includes arc-shaped scraping plates (81) disposed on both sides of the inner processing cylinder (12). Each of the two arc-shaped scraping plates (81) is provided with a guide plate (82), and both guide plates (82) are fixedly connected to the inner wall of the outer processing cylinder (1). Each of the two arc-shaped scraping plates (81) is provided with a second inclined surface at the top.

8. The equipment cleaning wastewater treatment and re-discharge system for indolecarbazole production according to claim 7, characterized in that, It also includes a flocculant addition component (9), which includes a fixing ring (91) set on the inner processing cylinder (12), a feed inlet is also provided on the inner processing cylinder (12), and an addition chamber (92) is provided on the outer processing cylinder (1). The addition chamber (92) passes through the fixing ring (91) and communicates with the inside of the feed inlet.

9. A process for treating and discharging wastewater from equipment cleaning in indolecarbazole production, applied to the equipment cleaning wastewater treatment and discharge system for indolecarbazole production as described in claim 8, characterized in that, Includes the following steps: S1: Wastewater from the equipment cleaning process for indolecarbazole production enters the inner processing cylinder (12) from the feed hopper (11). At this time, the filter mesh of the inner processing cylinder (12) faces upward, and the wastewater is temporarily stored inside the cylinder. Simultaneously, the flocculant addition component (9) is activated, and the agent in the addition hopper (92) is injected through the connection channel between the fixed ring (91) and the feed inlet of the inner processing cylinder (12). The agent initially contacts the wastewater, preparing for the subsequent flocculation reaction. S2: The stirring component (2) and the oscillating component (4) of the auxiliary filtration component work together. The stirring cylinder (21) rotates periodically under the drive of the oscillating component (4). Reverse oscillation, the second reciprocating screw (42) inside the U-shaped plate (41) rotates, driving the second nut (43) and the swing rod (44) to reciprocate. The swing rod (44) forces the stirring drum (21) to oscillate through the first spiral groove of the stirring drum (21). The stirring rod (22) then strongly disturbs the wastewater. At the same time, the drive assembly (7) drives the second reciprocating screw (42) to rotate through the drive shaft (71) to ensure that the oscillation frequency matches the stirring intensity, so that the reagent and wastewater are fully mixed and the fine particles are agglomerated into larger flocs; S3: After the flocculation reaction is completed, the drive mechanism drives The inner processing cylinder (12) rotates, causing the filter screen to turn to the bottom. Wastewater passes through the filter screen under gravity. The filtered water enters the gap between the outer processing cylinder (1) and the inner cylinder, and is finally discharged and collected from the discharge port (14). At this time, impurities and flocs are trapped on the inner wall of the inner processing cylinder (12) and the filter screen. The scraping assembly (8) starts to work. When the inner processing cylinder (12) rotates, the arc-shaped scraping plates (81) on both sides scrape off the remaining impurities on the outer wall. The impurities slide along the guide plate (82) to the discharge port (14) for centralized treatment, avoiding secondary pollution of the filtrate by impurities. S4: After filtration is completed, the pushing assembly (3) is moved. When the rotating assembly (5) starts cleaning the filter screen, the third reciprocating screw (61) in the rotating assembly (5) rotates under the reverse drive of the drive shaft (71) of the drive assembly (7). The third nut (62) drives the rotating rod (56) to slide back and forth. The rotating rod (56) drives the first reciprocating screw (31) to rotate through the second spiral groove (52) and vertical groove (53) of the rotating column (51). The first nut (32) moves back and forth along the smooth rod (33). Through the push rod (34), the arc-shaped pusher plate (24) slides along the inner wall of the processing inner cylinder (12) to completely scrape off the sediment on the filter screen holes.

10. The process for treating and discharging wastewater from equipment cleaning in indolecarbazole production according to claim 9, characterized in that: In S4, when the precipitate is pushed to the end cap (13), the end cap (13) is pushed open by the force of the torsion spring, and the impurities are discharged from the opening. After the entire cleaning action is completed, the end cap (13) is reset under the action of the torsion spring, and the system returns to the state of waiting for processing, ensuring the efficient operation of the next round of processing.

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