Dichloromethane separation system capable of replacing centrifugal washing based on PC project

Abstract

The invention relates to a dichloromethane separation technology, in particular to a dichloromethane separation system capable of replacing centrifugal washing based on a PC project, which comprises a dichloromethane separator, a high-efficiency coalescer and a pre-filtering assembly, the pre-filtering assembly comprises a main filtering tank, an auxiliary filtering tank, a main separation channel arranged on the main filtering tank, an auxiliary separation channel arranged on the auxiliary filtering tank and filters arranged in the main filtering tank and the auxiliary filtering tank; a channel conversion assembly and a driving assembly are installed on the pre-filtering assembly, the input end of the channel conversion assembly is connected with the output end of the driving assembly, and the channel conversion assembly is used for controlling opening or closing of the main separation channel and the auxiliary separation channel; the channel switching assembly and the driving assembly are matched to synchronously open and close the main separation channel and the auxiliary separation channel on the pre-filtering assembly, a pure mechanical transmission structure is adopted, switching use is more convenient, operation is more stable, and damage is not likely to happen.

Description

Technical Field

[0001] The invention relates to a dichloromethane separation technology, and in particular to a dichloromethane separation system based on PC (Polycarbonate) project which can replace centrifugal washing. Background Art

[0002] Methylene chloride plays an important role in the production of polycarbonate. As a powerful solvent, it can significantly improve the processability of polycarbonate. It helps promote polymerization reactions, making polycarbonate smoother during processing. In addition, methylene chloride can also reduce the melting point of the material, thereby improving its thermal stability, making polycarbonate easier to control during molding and processing. In addition to being a solvent, methylene chloride can also be used as a plasticizer to increase the flexibility and ductility of polycarbonate. This not only improves the mechanical properties of polycarbonate, but also enhances its weather resistance, allowing it to maintain good performance in various environmental conditions.

[0003] Since dichloromethane is highly toxic and carcinogenic, long-term exposure will cause harm to the human body. Therefore, during the production process, a safe and efficient separation system is needed to separate and treat it for better recycling. At present, in domestic polycarbonate projects, the separation of dichloromethane and brine mainly adopts centrifugal separation, but there are many disadvantages in the use of centrifuges, as follows: 1. Intermittent operation: It cannot be separated continuously, and frequent shutdowns are required to remove sediment, which may lead to reduced production efficiency; 2. Poor separation effect: The centrifuge has poor separation effect on dichloromethane and brine. The water content of dichloromethane after separation is greater than 10%, and the content of dichloromethane in the aqueous phase is greater than 10%; 3. Unstable separation efficiency: For example, if the dichloromethane content in the separated liquid is too low or too high, it may affect the separation effect; 4. Equipment 1. High cost: Its structure is relatively complex, and its manufacturing and maintenance costs are high; 2. High operating cost: The centrifuge has high energy consumption and high long-term operating costs; 3. High operating risk: The centrifuge is a high-speed moving equipment, and there are certain safety hazards in the operation process of personnel. Therefore, a process method combining a dichloromethane separator, a pre-filtration system and a high-efficiency coalescer can be used to efficiently separate dichloromethane, and the separation efficiency can reach 99.9%. In order to ensure the stable and continuous operation of the pre-filtration system, the current separation process generally uses two pre-filtration systems, one for normal operation and the other for standby. When the running pre-filtration system fails, the standby pre-filtration system will take over the operation to avoid long-term interruption of the separation process.

[0004] However, when the two pre-filtration systems are switched, the brine inlet and outlet channels of the filtration system must be opened and closed manually, or industrial computer electronic control must be used. The manual method requires operating multiple equipment switch ports, which is difficult to control. The separation system was temporarily shut down, and the electronic control system is prone to high temperature, high heat and high salinity environment. The electronic signal components are prone to corrosion and malfunction, resulting in failure of the pre-filtration system switching.

[0005] Therefore, in order to solve the above problems, a separation system can be designed that utilizes the principle of mechanical transmission to efficiently and synchronously switch the brine inlet and outlet channels. The system has the advantages of being simpler and more flexible to operate, less prone to failure, and low manufacturing cost. Summary of the invention

[0006] In order to overcome the problems of complicated operation and easy failure of electric control components when switching between the dual pre-filtration systems used in the existing dichloromethane separation system.

[0007] The technical scheme of the present invention is: a dichloromethane separation system based on PC project that can replace centrifugal washing, including a dichloromethane separator and a high-efficiency coalescer, and also including a pre-filtering component, the dichloromethane separator inputs brine into the pre-filtering component, the pre-filtering component inputs brine into the high-efficiency coalescer, the pre-filtering component includes a main filter tank, a secondary filter tank, a main separation channel arranged on the main filter tank, a secondary separation channel arranged on the secondary filter tank, and filters installed in the main filter tank and the secondary filter tank, the main separation channel and the secondary separation channel each include an inlet and an outlet, and the inlet is connected to the dichloromethane separator through a pipeline, and the outlet is connected to the high-efficiency coalescer through a pipeline. The pre-filter assembly is connected; a channel conversion assembly and a driving assembly are installed on the pre-filter assembly, the input end of the channel conversion assembly is connected to the output end of the driving assembly, and the channel conversion assembly is used to control the opening or closing of the main separation channel and the auxiliary separation channel; a central transmission assembly, a No. 1 transmission assembly and a vibration assembly are installed on the pre-filter assembly, the input end of the central transmission assembly is connected to the output end of the channel conversion assembly, the input end of the No. 1 transmission assembly is connected to the output end of the central transmission assembly, the input end of the vibration assembly is connected to the output end of the No. 1 transmission assembly, the vibration assembly is used to output power to the filter, and an air supply assembly is installed on the channel conversion assembly, and the air supply assembly is used to transport gas to the pre-filter assembly.

[0008] Preferably, the pre-filtration component also includes an axial tube installed in the main filter tank and the auxiliary filter tank respectively, a seepage tank arranged inside the main filter tank and the auxiliary filter tank, and a backwash channel and a sewage channel arranged on the main filter tank and the auxiliary filter tank. The desalted water flows into the main filter tank and the auxiliary filter tank through the backwash channel, and the sewage channel is used to discharge impurities in the brine; the filter includes a filter screen and a filter tube installed in the main filter tank and the auxiliary filter tank, the bottom of the filter tube is connected to the seepage tank, the brine enters the main filter tank through the inlet of the main separation channel, or enters the auxiliary filter tank through the inlet of the auxiliary separation channel, the brine is discharged from the outlet of the main separation channel through the filter tube and the seepage tank, or is discharged from the outlet of the auxiliary separation channel through the filter tube and the seepage tank.

[0009] Preferably, the channel conversion assembly includes a ball valve movably connected to the pre-filter assembly, a connecting port opened on the ball valve, a driven gear installed on the ball valve, a stud installed on the driven gear, a back plate and a driving bevel gear installed on the stud, the driven gear is connected to the output end of the driving assembly, the driving assembly is used to drive the driven gear, the screw, the ball valve, the back plate and the driving bevel gear to rotate, the ball valve is used to control the opening or closing of the main separation channel and the secondary separation channel; when the ball valve opens the main separation channel, the other ball valve closes the secondary separation channel; when the ball valve closes the main separation channel, the other ball valve opens the secondary separation channel.

[0010] Preferably, the driving assembly includes a crossbeam mounted on the pre-filter assembly, a motor mounted on the crossbeam, a driving gear mounted on the output end of the motor and a guide rod mounted on the crossbeam, the motor is used to drive the driving gear to rotate, the driving gear is meshed with the driven gear, and the driving gear is used to drive the driven gear to rotate.

[0011] Preferably, the central transmission assembly includes a linkage main bevel gear movably connected to the pre-filter assembly, a linkage rod with one end fixedly connected to the linkage main bevel gear, a linkage sub-bevel gear fixedly connected to the other end of the linkage rod, a frustum movably connected to the shaft tube, a gear table and a gear ring arranged on the frustum, the linkage main bevel gear is meshed with the adjacent driven gear, the driven bevel gear is used to drive the linkage main bevel gear, the linkage rod and the linkage sub-bevel gear to rotate, the linkage sub-bevel gear is meshed with the gear table, and the linkage sub-bevel gear is used to drive the frustum to rotate.

[0012] Preferably, the No. 1 transmission assembly includes a No. 1 movable main rod with one end movably connected to the pre-filter assembly, a No. 1 side main flat gear fixedly connected to the other end of the No. 1 movable main rod, a No. 1 transfer bevel gear fixedly installed on the No. 1 side main flat gear, a No. 1 movable sub-rod with one end movably connected to the shaft tube, a No. 1 side sub-flat gear fixedly connected to the other end of the No. 1 movable sub-rod and a turntable installed on the No. 1 side sub-flat gear, the No. 1 transfer bevel gear is meshed with a gear table, the gear table is used to drive the No. 1 transfer bevel gear, the No. 1 side main flat gear and the No. 1 movable main rod to rotate, the No. 1 side main flat gear is meshed with the No. 1 side sub-flat gear, and the No. 1 side main flat gear is used to drive the No. 1 side sub-flat gear, the No. 1 movable sub-rod and the turntable to rotate.

[0013] Preferably, the vibration assembly includes a bracket fixedly mounted on the pre-filter assembly, a sliding sleeve fixedly mounted on the bracket, a piston rod movably connected in the sliding sleeve, a vibration head fixedly mounted on one end of the piston rod and a rocker arm movably connected to the other end of the piston rod, the rocker arm movably connected to an eccentric position of a turntable, the turntable is used to drive the rocker arm to swing, and the rocker arm is used to drive the piston rod and the vibration head to move in a vertical direction.

[0014] Preferably, the air supply assembly includes a screw sleeve disk threadedly connected to the stud, a guide hole opened on the screw sleeve disk, an elastic gas hood installed on the back plate and an air supply pipe connected to the elastic gas hood at one end, the guide rod is arranged in the guide hole, the stud is used to drive the screw sleeve disk to move in the vertical direction, the other end of the air supply pipe is connected to the shaft tube, when the screw sleeve disk is close to the back plate, the elastic gas hood discharges gas through the air supply pipe; the shaft tube is provided with an upper air port and a lower air port, the upper air port outputs the gas in the shaft tube to the filter net, and the lower air port outputs the gas in the shaft tube to the filter tube.

[0015] Preferably, a No. 2 transmission assembly, an upper plugging assembly and a lower plugging assembly are installed on the pre-filter assembly, the input end of the No. 2 transmission assembly is connected to the output end of the central transmission assembly, the input end of the upper plugging assembly is connected to the output end of the No. 2 transmission assembly, the upper plugging assembly is used to open or close the upper air outlet, the input end of the lower plugging assembly is connected to the output end of the central transmission assembly, and the lower plugging assembly is used to open or close the lower air outlet; when the main separation channel is opened, the upper air outlet and the lower air outlet in the main filter tank are closed, and the upper air outlet and the lower air outlet in the auxiliary filter tank are opened; when the auxiliary separation channel is opened, the upper air outlet and the lower air outlet in the main filter tank are opened, and the upper air outlet and the lower air outlet in the auxiliary filter tank are closed.

[0016] Preferably, the No. 2 transmission assembly includes a No. 2 movable main rod with one end movably connected to the pre-filter assembly, a No. 2 transmission main bevel gear fixedly installed at the other end of the No. 2 movable main rod, a No. 2 movable sub-rod with one end fixedly connected to the No. 2 transmission main bevel gear and a No. 2 transmission sub-bevel gear installed at the other end of the No. 2 movable sub-rod, the No. 2 transmission main bevel gear is meshed with a gear table, and the gear table is used to drive the No. 2 transmission main bevel gear, the No. 2 movable main rod, the No. 2 movable sub-rod and the No. 2 transmission sub-bevel gear to rotate, and the No. 2 transmission sub-bevel gear is arranged on the inner side of the shaft tube; the upper sealing assembly includes a screw rod with one end movably connected to the shaft tube, a shaft rod fixedly installed at the other end of the screw rod, a transmission bevel gear installed on the shaft rod, a screw sleeve head threadedly connected to the screw, and a screw sleeve head fixedly installed The support rod and the baffle fixedly installed on the top of the support rod, the transmission bevel gear is meshed with the second transmission sub-bevel gear, the second transmission sub-bevel gear is used to drive the transmission bevel gear, the shaft and the screw to rotate, and the screw is used to drive the screw sleeve head to move in the vertical direction; when the screw sleeve head moves up in the vertical direction, the baffle is away from the upwind port; when the screw sleeve head moves down in the vertical direction, the baffle is close to the upwind port; the lower sealing assembly includes a bracket fixedly installed on the shaft tube, a shaft column movably connected to the bracket, a transmission flat gear fixedly installed at one end of the shaft column, a plug fixedly installed at the other end of the shaft column and a through hole opened on the plug, the transmission flat gear is meshed with the ring gear, the ring gear is used to drive the transmission flat gear, the shaft column and the plug to rotate, the plug is movably connected in the downwind port, and the plug is used to open or close the downwind port.

[0017] Beneficial effects of the present invention: 1. The channel conversion component and the drive component are used to synchronously open and close the main separation channel and the auxiliary separation channel on the pre-filter component. The pure mechanical transmission structure is more convenient to switch and use than the manual opening and closing method. Compared with the electronic signal control opening and closing method, the operation is more stable and not easy to be damaged; 2. By using the method of transmitting power to the No. 1 transmission component and the vibration component through the central transmission component when the channel conversion component is running, the filters in the main filter tank and the auxiliary filter tank can be continuously struck and collided when switching between the main separation channel and the auxiliary separation channel, which helps the crystals on the filter to break and fall off, facilitating subsequent cleaning; 3. Through the upper and lower area settings of the filter screen and the filter tube, the vibration component can simultaneously vibrate and clean the two, with good cleaning effect and high efficiency; 4. By using the method of transmitting power to the air supply component when the channel conversion component is running, in conjunction with the vibration component, while hitting and breaking the crystals on the filter, it can also assist the wind to blow the broken crystals, thereby reducing the partially broken crystals adhering to the filter; 5. The upper plugging component and the lower plugging component are synchronously driven by the central transmission component. When switching between the main separation channel and the auxiliary separation channel, the upper and lower air outlets are opened or closed accordingly to prevent salt water crystals from blocking the upper and lower air outlets when the equipment is put into operation, thereby ensuring air supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a cross-sectional structural schematic diagram of a pre-filtering component of a dichloromethane separation system based on PC project that can replace centrifugal washing of the present invention; Figure 2 The present invention shows a process flow diagram of a dichloromethane separation system based on PC project that can replace centrifugal washing; Figure 3 Shown is a schematic diagram of the external three-dimensional structure of the dichloromethane separation system based on the PC project of the present invention that can replace centrifugal washing; Figure 4 Shown is a schematic diagram of the structure of a channel conversion component and a driving component of a dichloromethane separation system based on PC project that can replace centrifugal washing of the present invention; Figure 5 Shown is a schematic diagram of the structure of a channel conversion component, a central transmission component, a No. 1 transmission component and a vibration component of a dichloromethane separation system based on PC project that can replace centrifugal washing of the present invention; Figure 6 Shown is a schematic diagram of the structure of the first transmission component and the vibration component of the dichloromethane separation system based on the PC project of the present invention that can replace centrifugal washing; Figure 7 The PC-based dichloromethane separation system of the present invention can replace centrifugal washing. Figure 1 The enlarged structural diagram at A in the middle; Figure 8 The PC-based dichloromethane separation system of the present invention can replace centrifugal washing. Figure 1 The enlarged structural diagram at B in the middle; Fig. 9 Shown is a schematic diagram of the structure of a channel conversion component and an air supply component of a dichloromethane separation system based on the PC project that can replace centrifugal washing of the present invention; Fig.10 Shown is a schematic diagram of the structure of the central transmission component, the second transmission component and the upper plugging component of the dichloromethane separation system based on the PC project that can replace centrifugal washing of the present invention; Fig.11 Shown is a schematic diagram of the structure of the central transmission component and the lower plugging component of the dichloromethane separation system based on the PC project that can replace centrifugal washing of the present invention; Fig.12Shown is a schematic diagram of the structure of the shaft tube, the second transmission component and the lower plugging component of the dichloromethane separation system based on the PC project that can replace centrifugal washing of the present invention; Fig.13 The PC-based dichloromethane separation system of the present invention can replace centrifugal washing. Figure 1 The enlarged structural diagram at C in the middle; Fig.14 The PC-based dichloromethane separation system of the present invention can replace centrifugal washing. Figure 1 The enlarged structural diagram at D in the middle; Fig.15 The PC-based dichloromethane separation system of the present invention can replace centrifugal washing. Figure 1 Enlarged structural diagram at point E in the middle.

[0019] Description of the accompanying drawings: 1. dichloromethane separator; 2. pre-filter assembly; 3. high-efficiency coalescer; 10. upwind; 11. downwind; 201. main filter tank; 202. auxiliary filter tank; 203. shaft tube; 204. filter screen; 205. filter tube; 206. seepage chamber; 207. backwash channel; 208. sewage channel; 209. main separation channel; 210. auxiliary separation channel; 401. ball valve; 402. communication port; 403. driven gear; 404. stud; 405. back plate; 406. driving bevel gear; 501. crossbeam; 502. motor; 503. driving gear; 504. guide rod; 601. linkage main bevel gear; 602. linkage rod; 603. linkage auxiliary bevel gear; 604. cone; 605. gear table; 606. gear ring; 701. No. 1 movable main rod ; 702, side main flat gear No. 1; 703, transmission bevel gear No. 1; 704, movable auxiliary rod No. 1; 705, side auxiliary flat gear No. 1; 706, turntable; 801, bracket; 802, sliding sleeve; 803, piston rod; 804, vibrating head; 805, rocker arm; 901, screw sleeve disk; 902, guide hole; 903, elastic air cover; 904, air supply pipe; 1201, movable main rod No. 2 ; 1202, No. 2 transmission main bevel gear; 1203, No. 2 movable auxiliary rod; 1204, No. 2 transmission auxiliary bevel gear; 1301, screw rod; 1302, shaft rod; 1303, transmission bevel gear; 1304, screw sleeve head; 1305, support rod; 1306, plug; 1401, bracket; 1402, shaft column; 1403, transmission flat gear; 1404, plug; 1405, through hole. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] See also Figure 1-Figure 15The present invention provides an embodiment: a dichloromethane separation system based on PC project that can replace centrifugal washing, including a dichloromethane separator 1 and a high-efficiency coalescer 3, and also including a pre-filter component 2, the dichloromethane separator 1 inputs brine into the pre-filter component 2, the pre-filter component 2 inputs brine into the high-efficiency coalescer 3, the pre-filter component 2 includes a main filter tank 201, a secondary filter tank 202, a main separation channel 209 arranged on the main filter tank 201, a secondary separation channel 210 arranged on the secondary filter tank 202, and filters installed in the main filter tank 201 and the secondary filter tank 202, the main separation channel 209 and the secondary separation channel 210 each include an inlet and an outlet, and the inlet The inlets are connected to the dichloromethane separator 1 through pipelines, and the outlets are connected to the high-efficiency coalescer 3 through pipelines; a channel conversion component and a drive component are installed on the pre-filter component 2, the input end of the channel conversion component is connected to the output end of the drive component, and the channel conversion component is used to control the opening or closing of the main separation channel 209 and the secondary separation channel 210; a central transmission component, a No. 1 transmission component and a vibration component are installed on the pre-filter component 2, the input end of the central transmission component is connected to the output end of the channel conversion component, the input end of the No. 1 transmission component is connected to the output end of the central transmission component, the input end of the vibration component is connected to the output end of the No. 1 transmission component, and the vibration component is used to output power to the filter, The channel conversion component is equipped with an air supply component, which is used to transport the gas to the pre-filter component 2. The user controls (or is controlled by an industrial computer) the drive component to move, output power to the channel conversion component, and opens the main separation channel 209 while closing the secondary separation channel 210, so that the main filter tank 201 is connected to the separation system, and the secondary filter tank 202 is disconnected from the separation system. Then the user first opens the venting port of the equipment in the separation system such as the dichloromethane separator 1, the pre-filter component 2 and the high-efficiency coalescer 3, and the equipment starts to take in liquid. When the equipment is filled with mixed liquid, the venting port is closed, and the system starts to work normally. After the dichloromethane separator 1 separates part of the dichloromethane, the remaining brine passes through the main separation The inlet of the separation channel 209 is input into the main filter tank 201, and the impurities in the brine are removed by the filter therein, and then the remaining brine flows into the high-efficiency coalescer 3 from the outlet of the main separation channel 209 (the brine separated by the dichloromethane separator 1 enters the pre-filter component 2 through the water phase outlet for treatment to remove solid impurities in the water, and the separated dichloromethane enters the dichloromethane recovery tank through the pipeline, and the brine filtered by the pre-filter component 2 enters the high-efficiency coalescer 3 to demulsify and remove the small amount of emulsified dichloromethane remaining in the brine, and the brine goes to the subsequent process, and the separated dichloromethane goes to the dichloromethane recovery tank; after the above process, the separation efficiency of dichloromethane and brine is greater than 99.9%), after the filter inside the main filter tank 201 fails, the drive component is started again, and the channel conversion component is controlled to close the main separation channel 209 while opening the secondary separation channel 210, so that the main filter tank 201 is disconnected from the separation system, and the secondary filter tank 202 is connected to the separation system, and the salt water is input into the secondary filter tank 202 through the inlet of the secondary separation channel 210, and the impurities in the salt water are removed by using the filter therein, and then the remaining salt water flows into the high-efficiency coalescer 3 from the outlet of the secondary separation channel 210. During the operation of the drive component and the channel conversion component, the central transmission component and the No. 1 transmission component transmit the power of the channel conversion component to the vibration component, and the vibration component vibrates the filter to force the crystals or impurities adhering to the filter to break and peel off. At the same time, the channel conversion component also outputs power to the air supply component, and the air flow is transported to the pre-filter component 2 through the air supply component to purge the filter (it is worth noting that when the main filter tank 201 is disconnected from the separation system, the filter in the main filter tank 201 is blown Sweep, when the auxiliary filter tank 202 is disconnected from the separation system, the filter in the auxiliary filter tank 202 is purged). The water content in the dichloromethane separated by this system is less than 0.1%, and the dichloromethane in the brine is less than 0.1%; when the ratio of dichloromethane to brine fluctuates greatly, its separation effect is not affected, and it can be operated stably for a long period of time; the equipment used in this system is static separation equipment, which basically has no additional energy consumption; each device used in the system, through its unique structural design, ensures that it can operate stably for a long period of time, does not require frequent maintenance during normal operation, and has a low daily maintenance workload; all equipment used in the system is static separation equipment, and the operation workload during the operation process is small (it is worth noting that: the dichloromethane separator 1 and the high-efficiency coalescer 3 are all existing technologies, which will not be repeated here. The pre-filter component 2 is mainly used to filter impurities in the brine. The dichloromethane separator 1-pre-filter component 2-high-efficiency coalescer 3, such a separation system itself has the advantages of high separation efficiency, stable operation, low operating cost, simple daily maintenance and good safety). .

[0022] See also Figure 1-Figure 3 , Figure 8 and Figure 12-Figure 15In this embodiment, the pre-filter assembly 2 also includes an axial tube 203 installed in the main filter tank 201 and the auxiliary filter tank 202, a seepage chamber 206 arranged inside the main filter tank 201 and the auxiliary filter tank 202, and a backwash channel 207 and a sewage channel 208 arranged on the main filter tank 201 and the auxiliary filter tank 202. The desalted water flows into the main filter tank 201 and the auxiliary filter tank 202 through the backwash channel 207, and the sewage channel 208 is used to discharge impurities in the salt water; the filter includes a filter screen 204 and a filter screen installed in the main filter tank 201 and the auxiliary filter tank 202. The filter tube 205, the bottom of the filter tube 205 is connected to the seepage chamber 206, the salt water enters the main filter tank 201 through the inlet of the main separation channel 209, or enters the secondary filter tank 202 through the inlet of the secondary separation channel 210, the salt water is discharged from the outlet of the main separation channel 209 through the filter tube 205 and the seepage chamber 206, or is discharged from the outlet of the secondary separation channel 210 through the filter tube 205 and the seepage chamber 206, the salt water enters the main filter tank 201 through the inlet of the main separation channel 209 (or enters the secondary filter tank 202 through the inlet of the secondary separation channel 210) using the filter screen 204 In conjunction with the double filtration form of the filter tube 205, a permeable membrane is set in the filter holes on the filter tube 205. The salt water entering the main filter tank 201 (or the auxiliary filter tank 202) first passes through the filter screen 204 for the first filtration, and the impurities remain on the filter screen 204. The remaining salt water flows downward and passes through the filter holes and the permeable membrane on the filter tube 205 for the second filtration. The impurities accumulate at the bottom of the main filter tank 201 or the auxiliary filter tank 202. The salt water passing through the filter holes enters the seepage chamber 206 and is then discharged from the outlet of the main separation channel 209 (or the outlet of the auxiliary separation channel 210) (it is worth noting that When the system is running, the backwash channel 207 is in a closed state and is only opened when the internal part of the equipment needs to be flushed. The sewage channel 208 adopts an intermittent opening and closing method. The opening and closing methods of the backwash channel 207 and the sewage channel 208 can both adopt common manual or electric control). The air supply component inputs the gas into the shaft tube 203 and discharges it outward (it is worth noting that: when the main separation channel 209 is closed, the air supply component inputs the gas into the shaft tube 203 in the main filter tank 201, and when the secondary separation channel 210 is closed, the air supply component inputs the gas into the shaft tube 203 in the secondary filter tank 202).

[0023] See also Figure 1 , Figure 3 , Figure 4-Figure 5 , Figure 7 and Fig. 9In this embodiment, the channel conversion component includes a ball valve 401 movably connected to the pre-filter component 2, a communication port 402 opened on the ball valve 401, a driven gear 403 installed on the ball valve 401, a stud 404 installed on the driven gear 403, a back plate 405 installed on the stud 404, and a driving bevel gear 406. The driven gear 403 is connected to the output end of the driving component. The driving component is used to drive the driven gear 403, the screw 1301, the ball valve 401, the back plate 405 and the driving bevel gear 406 to rotate. The ball valve 40 1 is used to control the opening or closing of the main separation channel 209 and the secondary separation channel 210; when the ball valve 401 opens the main separation channel 209, the other ball valve 401 closes the secondary separation channel 210; when the ball valve 401 closes the main separation channel 209, the other ball valve 401 opens the secondary separation channel 210; the driving component includes a beam 501 installed on the pre-filter component 2, a motor 502 installed on the beam 501, a driving gear 503 installed on the output end of the motor 502, and a guide rod 504 installed on the beam 501, and the motor 502 is used to The driving gear 503 is driven to rotate, and the driving gear 503 is meshed with the driven gear 403. The driving gear 503 is used to drive the driven gear 403 to rotate. The ball valve 401 is arranged in the main separation channel 209 and the auxiliary separation channel 210. The driven gears 403 on the ball valve 401 are connected to the driving gear 503 in the driving assembly. When the motor 502 is started, the driving gear 503 transmits power to all the driven gears 403 meshed with it to realize synchronous driving operation (it is worth noting that during the whole process of system operation, the main separation channel 209 The connecting port 402 of the middle ball valve 401 and the connecting port 402 of the middle ball valve 401 of the secondary separation channel 210 are always in a vertically staggered state, that is, when the main separation channel 209 is aligned with the corresponding connecting port 402 and is in an open state, the secondary separation channel 210 is staggered with the corresponding connecting port 402 and is in a closed state, and vice versa). The stud 404, the back plate 405 and the active bevel gear 406 on the same rotation axis also rotate together with the ball valve 401, and the power is transmitted to the central transmission component through the rotating active bevel gear 406.

[0024] See also Figure 1 , Figure 5-Figure 7 and Figure 10-12In this embodiment, the central transmission assembly includes a linkage main bevel gear 601 movably connected to the pre-filter assembly 2, a linkage rod 602 with one end fixedly connected to the linkage main bevel gear 601, a linkage sub-bevel gear 603 fixedly connected to the other end of the linkage rod 602, a frustum 604 movably connected to the shaft tube 203, a gear table 605 and a gear ring 606 arranged on the frustum 604, the linkage main bevel gear 601 is meshed with the adjacent driven gear 403, and the driven bevel gear is used to drive the linkage main bevel gear 601, the linkage rod 602 and the linkage sub-bevel gear The wheel 603 rotates, and the linkage secondary bevel gear 603 meshes with the gear table 605. The linkage secondary bevel gear 603 is used to drive the cone 604 to rotate. The rotating active bevel gear 406 transmits power to the linkage main bevel gear 601, so that the linkage main bevel gear 601, the connecting rod and the linkage secondary bevel gear 603 rotate together, and transmits power to the cone 604 with the gear table 605 through the linkage secondary bevel gear 603, so that the cone 604 rotates horizontally, so that when the ball valve 401 rotates, the cone 604 rotates synchronously and outputs power to the No. 1 transmission component.

[0025] See also Figure 1 , Figure 5-Figure 6 and Figure 10-11In this embodiment, the No. 1 transmission assembly includes a No. 1 movable main rod 701 with one end movably connected to the pre-filter assembly 2, a No. 1 side main flat gear 702 fixedly connected to the other end of the No. 1 movable main rod 701, a No. 1 transmission bevel gear 703 fixedly installed on the No. 1 side main flat gear 702, a No. 1 movable sub-rod 704 with one end movably connected to the shaft tube 203, a No. 1 side sub-flat gear 705 fixedly connected to the other end of the No. 1 movable sub-rod 704 and a turntable 706 installed on the No. 1 side sub-flat gear 705, the No. 1 transmission bevel gear 703 is meshed with a gear stand 605, and the gear stand 605 is used to drive the No. 1 transmission bevel gear 703, the No. 1 side main flat gear 702 and the No. 1 movable main rod 701 to rotate, and a The main flat gear 702 on the No. 1 side is meshed with the secondary flat gear 705 on the No. 1 side, and the main flat gear 702 on the No. 1 side is used to drive the secondary flat gear 705 on the No. 1 side, the movable secondary rod 704 and the turntable 706 to rotate; the vibration component includes a bracket 801 fixedly mounted on the pre-filter component 2, a sliding sleeve 802 fixedly mounted on the bracket 801, a piston rod 803 movably connected in the sliding sleeve 802, a vibration head 804 fixedly mounted on one end of the piston rod 803 and a rocker arm 805 movably connected to the other end of the piston rod 803, the rocker arm 805 is movably connected to the eccentric position of the turntable 706, the turntable 706 is used to drive the rocker arm 805 to swing, and the rocker arm 805 is used to drive the piston rod 803 and the vibration head 804 to rotate in the vertical direction. The first transmission bevel gear 703 meshed with the gear table 605 receives the power of the cone table 604 to rotate, and at the same time, the first movable main rod 701 and the first side main flat gear 702 rotate, and the first side main flat gear 702 outputs the power to the first side sub flat gear 705, so that the first movable sub rod 704 and the turntable 706 rotate synchronously, and the rocker arm 80 connected to the turntable 706 through the eccentric movement. The continuous swinging effect of 5 produces a continuous push-pull effect on the piston rod 803, causing the piston rod 803 to move up and down. When the piston rod 803 moves up, the striking head 804 hits the filter screen 204, and when it moves down, the striking head 804 hits the filter tube 205, causing the filter screen 204 and the filter tube 205 to vibrate through the impact force, breaking and shaking off the crystals attached thereto (it is worth noting that: the filter screen 204 and the filter tube 205 are both metal materials with a certain toughness, which can be slightly deformed and vibrated when subjected to force; in addition, the striking frequency and number of times of the striking head 804 are related to the power output efficiency of the No. 1 transmission component, that is, the transmission ratio between the gear table 605 and the No. 1 transmission bevel gear 703, and the design can be adjusted as needed in actual applications).

[0026] See also Figure 1 , Figure 3-Figure 4 , Figure 7 , Fig. 9 and Fig.12 In this embodiment, the air supply assembly includes a screw sleeve disc 901 threadedly connected to the stud 404, a guide hole 902 provided on the screw sleeve disc 901, an elastic gas cover 903 installed on the back plate 405, and an air supply pipe 904 connected to the elastic gas cover 903 at one end, the guide rod 504 is arranged in the guide hole 902, the stud 404 is used to drive the screw sleeve disc 901 to move in the vertical direction, and the other end of the air supply pipe 904 is connected to the shaft tube 203. When the screw sleeve disc 901 is close to the back plate 405, the air supply pipe 904 is connected to the shaft tube 203. 05, the elastic gas cover 903 exhausts gas through the air delivery pipe 904; the shaft tube 203 is provided with an upper air port 10 and a lower air port 11, the upper air port 10 outputs the gas in the shaft tube 203 to the filter screen 204, and the lower air port 11 outputs the gas in the shaft tube 203 to the filter tube 205. When the ball valve 401 rotates, the stud 404 rotates together, so that the screw sleeve disc 901 on the stud 404 moves along the axial direction of the stud 404, toward the elastic gas cover 901 on the back plate 405. 03 (the elastic air cover 903 includes a plurality of skeleton rings arranged longitudinally, with a rubber layer wrapped outside. The skeleton rings close up after being compressed and return to their original state after being released. It is the same as the accordion structure in the prior art and will not be described in detail here) When the screw sleeve disc 901 approaches the elastic air cover 903, it will gradually apply a squeezing force to it. After the elastic air cover 903 is compressed, the gas inside is discharged and enters the shaft tube 203 through the air supply pipe 904, and finally discharged from the upper air port 10 and the lower air port 11. The gas discharged from 10 is used to purge the filter screen 204, and the gas discharged from the downwind port 11 is used to purge the filter tube 205 (it is worth noting that multiple upwind ports 10 and downwind ports 11 can be provided according to actual needs, and are not limited to the positions in the attached drawings of this scheme). Some crystals that are broken by vibration are easy to adhere to the top of the filter screen 204 or to the permeable membrane of the filter tube 205. This method is used to purge the filter screen 204 and the filter tube 205 by wind, which further promotes the falling of the broken crystals.

[0027] See also Figure 1 , Figure 5 and Figure 10-Figure 15In this embodiment, a No. 2 transmission component, an upper plugging component and a lower plugging component are installed on the pre-filter component 2. The input end of the No. 2 transmission component is connected to the output end of the central transmission component, the input end of the upper plugging component is connected to the output end of the No. 2 transmission component, the upper plugging component is used to open or close the upper air outlet 10, the input end of the lower plugging component is connected to the output end of the central transmission component, and the lower plugging component is used to open or close the lower air outlet 11; when the main separation channel 209 is opened, the upper air outlet 10 and the lower air outlet 11 in the main filter tank 201 are closed, and the upper air outlet 10 and the lower air outlet 11 in the auxiliary filter tank 202 are closed. The air vent 11 is opened; when the secondary separation channel 210 is opened, the upper air vent 10 and the lower air vent 11 in the main filter tank 201 are opened, and the upper air vent 10 and the lower air vent 11 in the secondary filter tank 202 are closed; the No. 2 transmission assembly includes a No. 2 movable main rod 1201 movably connected to the pre-filter assembly 2 at one end, a No. 2 transmission main bevel gear 1202 fixedly installed at the other end of the No. 2 movable main rod 1201, a No. 2 movable auxiliary rod 1203 fixedly connected to the No. 2 transmission main bevel gear 1202 at one end, and a No. 2 transmission auxiliary bevel gear 1204 installed at the other end of the No. 2 movable auxiliary rod 1203, and the No. 2 transmission auxiliary bevel gear 1204 installed at the other end of the No. 2 movable auxiliary rod 1203. The transmission main bevel gear 1202 is meshed with the gear table 605, and the gear table 605 is used to drive the second transmission main bevel gear 1202, the second movable main rod 1201, the second movable sub-rod 1203 and the second transmission sub-bevel gear 1204 to rotate, and the second transmission sub-bevel gear 1204 is arranged on the inner side of the shaft tube 203; the upper plugging assembly includes a screw 1301 with one end movably connected to the shaft tube 203, a shaft 1302 fixedly installed at the other end of the screw 1301, a transmission bevel gear 1303 installed on the shaft 1302, a screw sleeve head 1304 threadedly connected to the screw 1301, and a screw sleeve head 1304 fixedly installed at the other end of the screw 1301. A support rod 1305 fixedly mounted on the screw sleeve head 1304 and a plugging plate 1306 fixedly mounted on the top of the support rod 1305, a transmission bevel gear 1303 meshes with a second transmission sub-bevel gear 1204, and the second transmission sub-bevel gear 1204 is used to drive the transmission bevel gear 1303, the shaft 1302 and the screw 1301 to rotate, and the screw 1301 is used to drive the screw sleeve head 1304 to move in the vertical direction; when the screw sleeve head 1304 moves up in the vertical direction, the plugging plate 1306 moves away from the upper air outlet 10; when the screw sleeve head 1304 moves down in the vertical direction, the plugging plate 1306 approaches the upper air outlet 10;The lower plugging assembly includes a bracket 1401 fixedly mounted on the shaft tube 203, a shaft column 1402 movably connected to the bracket 1401, a transmission flat gear 1403 fixedly mounted on one end of the shaft column 1402, a plug 1404 fixedly mounted on the other end of the shaft column 1402, and a through hole 1405 opened on the plug 1404. The transmission flat gear 1403 is meshed with a gear ring 606. The gear ring 606 is used to drive the transmission flat gear 1403, the shaft column 1402 and the plug 1404 to rotate. The plug 1404 The plug 1404 is movably connected in the lower air outlet 11, and is used to open or close the lower air outlet 11. (The upper air outlet 10 and the lower air outlet 11 are easily blocked by salt water crystals, or salt water is easily poured in when the separation system is running.) When the ball valve 401 switches the main separation channel 209 from the closed state to the open state, the power is transmitted to the second transmission main bevel gear 1202 in the second transmission assembly through the gear stand 605 in the central transmission assembly, and the second transmission main bevel gear 1202 drives the second transmission assembly through the second movable auxiliary rod 1203. The transmission vice bevel gear 1204 rotates, and the second transmission vice bevel gear 1204 transmits power to the transmission bevel gear 1303 in the upper plugging assembly, so that the shaft 1302 and the screw 1301 fixed to the transmission bevel gear 1303 rotate, driving the screw sleeve head 1304 threadedly connected to the screw 1301 to move downward along the screw 1301, so that the blocking plate 1306 closes the upper air outlet 10. At the same time, the gear ring 606 in the central transmission assembly transmits power to the transmission flat gear 1403 in the lower plugging assembly. The shaft column 1402 and the plug 1404 fixed to the transmission flat gear 1403 rotate synchronously, and the through hole 1405 on the plug 1404 is staggered with the downwind port 11, so that the downwind port 11 is closed. At this time, the main filter tank 201 in the pre-filter assembly 2 is connected to the separation system to work (the secondary separation channel 210 on the other side is switched from the open state to the closed state, and at the same time, according to the above process, the corresponding upwind port 10 and downwind port 11 in the secondary filter tank 202 are opened, and the secondary filter tank 202 is disconnected from the separation system). ;

[0028] Working principle: When the separation system is in normal operation, the main separation channel 209 is in an open state, the secondary separation channel 210 is in a closed state, the main filter tank 201 is connected to the separation system, and the secondary filter tank 202 is disconnected from the separation system. The mixed liquid first enters the dichloromethane separator 1, and the separated dichloromethane enters the dichloromethane recovery tank through a pipeline. The separated brine enters the main filter tank 201 through the water phase outlet for treatment to remove solid impurities in the water. The brine filtered by the filter in the main filter tank 201 (double filtration by the filter screen 204 and the filter tube 205) enters the high-efficiency coalescer 3 to demulsify and remove the small amount of emulsified dichloromethane remaining in the brine, and the brine goes to the subsequent process, and the separated dichloromethane goes to the dichloromethane recovery tank; When the filter in the main filter tank 201 is clogged, or a device associated with the operation of the main filter tank 201 fails, the user starts the motor 502, drives the driving gear 503 to rotate through the motor 502, and uses the driving gear 503 to mesh with the driven gear 403, driving the ball valve 401, the stud 404, the back plate 405 and the driving bevel gear 406 on the same rotation axis as the driven gear 403 to rotate; The driving bevel gear 406 rotates synchronously with the ball valve 401, and transmits power to the linkage main bevel gear 601, driving the linkage rod 602 and the linkage auxiliary bevel gear 603 connected to the linkage main bevel gear 601 to rotate. The linkage auxiliary bevel gear 603 transmits the rotational power to the cone table 604 through the gear table 605. The cone table 604 rotates, and then the gear table 605 transmits power to the first transmission bevel gear 703, so that the first side main flat gear connected to the first transmission bevel gear 703 rotates. The wheel 702 and the No. 1 movable main rod 701 rotate, and the No. 1 side main flat gear 702 outputs power to the No. 1 side auxiliary flat gear 705 and the turntable 706. During the rotation process, the turntable 706 swings through the eccentrically arranged rocker arm 805, which generates continuous push and pull forces on the piston rod 803, so that the vibration head 804 on the piston rod 803 continuously strikes the filter screen 204 and the filter tube 205, achieving a vibration effect, causing the crystals on the filter screen 204 and the filter tube 205 to break and fall off; The cone 604 rotates synchronously with the ball valve 401, and transmits power to the No. 2 transmission assembly and the lower plugging assembly respectively by means of the gear 605 and the gear ring 606. The No. 2 transmission main bevel gear 1202 in the No. 2 transmission assembly drives the No. 2 transmission secondary bevel gear 1204 to rotate, and the No. 2 transmission secondary bevel gear 1204 outputs power to the transmission bevel gear 1303, so that the plugging plate 1306 moves up and down along the rotating screw 1301, so that the upper air outlet 10 in the main filter tank 201 is opened, and the upper air outlet 10 in the secondary filter tank 202 is closed, and the transmission flat gear 1403 meshing with the gear ring 606 drives the plug 1404 to rotate, so that the lower air outlet 11 in the main filter tank 201 is opened, and the lower air outlet 11 in the secondary filter tank 202 is closed; At the same time, the screw sleeve disc 901 on the stud 404 moves along the stud 404, and the screw sleeve disc 901 on one side cooperates with the corresponding back plate 405 to squeeze the corresponding elastic gas cover 903, so that the gas therein is input into the shaft tube 203 in the main filter tank 201, and is discharged from the opened upper air port 10 and lower air port 11 to purge the filter, and the screw sleeve disc 901 on the other side is away from the corresponding elastic gas cover 903; During the rotation of ball valve 401, main separation channel 209 is gradually closed and auxiliary separation channel 210 is opened, so that main filter tank 201 is finally disconnected from the separation system, while auxiliary filter tank 202 is connected to the separation system to replace main filter tank 201 and continue to separate dichloromethane.

Claims

1. A dichloromethane separation system based on PC project that can replace centrifugal washing, comprising a dichloromethane separator (1) and a high-efficiency coalescer (3); characterized in that: It also includes a pre-filtering component (2), the dichloromethane separator (1) inputs salt water into the pre-filtering component (2), and the pre-filtering component (2) inputs salt water into the high-efficiency coalescer (3), the pre-filtering component (2) includes a main filter tank (201), a secondary filter tank (202), a main separation channel (209) arranged on the main filter tank (201), a secondary separation channel (210) arranged on the secondary filter tank (202), and filters installed in the main filter tank (201) and the secondary filter tank (202), the main separation channel (209) and the secondary separation channel (210) each including an inlet and an outlet, and the inlet is connected to the dichloromethane separator (1) through a pipeline, and the outlet is connected to the high-efficiency coalescer (3) through a pipeline; A channel conversion component and a drive component are installed on the pre-filter component (2), the input end of the channel conversion component is connected to the output end of the drive component, and the channel conversion component is used to control the opening or closing of the main separation channel (209) and the auxiliary separation channel (210); The pre-filtering assembly (2) is equipped with a central transmission assembly, a No. 1 transmission assembly and a vibration assembly. The input end of the central transmission assembly is connected to the output end of the channel conversion assembly, the input end of the No. 1 transmission assembly is connected to the output end of the central transmission assembly, and the input end of the vibration assembly is connected to the output end of the No. 1 transmission assembly. The vibration assembly is used to output power to the filter. The channel conversion assembly is equipped with an air supply assembly, which is used to transport gas to the pre-filtering assembly (2).

2. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 1, characterized in that: The pre-filter assembly (2) further comprises an axial tube (203) respectively installed in the main filter tank (201) and the auxiliary filter tank (202), a seepage chamber (206) arranged inside the main filter tank (201) and the auxiliary filter tank (202), and a backwash channel (207) and a sewage channel (208) arranged on the main filter tank (201) and the auxiliary filter tank (202); desalted water flows into the main filter tank (201) and the auxiliary filter tank (202) through the backwash channel (207); and the sewage channel (208) is used to discharge impurities in the salt water; The filter comprises a filter screen (204) and a filter tube (205) installed in a main filter tank (201) and a secondary filter tank (202); the bottom of the filter tube (205) is connected to a seepage chamber (206); salt water enters the main filter tank (201) through the inlet of a main separation channel (209), or enters the secondary filter tank (202) through the inlet of a secondary separation channel (210); the salt water is discharged from the outlet of the main separation channel (209) through the filter tube (205) and the seepage chamber (206), or is discharged from the outlet of the secondary separation channel (210) through the filter tube (205) and the seepage chamber (206).

3. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 2, characterized in that: The channel conversion component comprises a ball valve (401) movably connected to the pre-filter component (2), a communication port (402) provided on the ball valve (401), a driven gear (403) mounted on the ball valve (401), a stud (404) mounted on the driven gear (403), a back plate (405) mounted on the stud (404), and a driving bevel gear (406); the driven gear (403) is connected to the output end of the driving component; the driving component is used to drive the driven gear (403), the screw (1301), the ball valve (401), the back plate (405), and the driving bevel gear (406) to rotate; the ball valve (401) is used to control the main separation channel (209) and the auxiliary separation channel (210) to be opened or closed; When the ball valve (401) opens the main separation channel (209), the other ball valve (401) closes the secondary separation channel (210); when the ball valve (401) closes the main separation channel (209), the other ball valve (401) opens the secondary separation channel (210).

4. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 3, characterized in that: The driving assembly comprises a crossbeam (501) mounted on the pre-filtering assembly (2), a motor (502) mounted on the crossbeam (501), a driving gear (503) mounted on the output end of the motor (502), and a guide rod (504) mounted on the crossbeam (501); the motor (502) is used to drive the driving gear (503) to rotate; the driving gear (503) is meshed with a driven gear (403); and the driving gear (503) is used to drive the driven gear (403) to rotate.

5. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 4, characterized in that: The central transmission assembly comprises a linkage main bevel gear (601) movably connected to the pre-filter assembly (2), a linkage rod (602) having one end fixedly connected to the linkage main bevel gear (601), a linkage sub-bevel gear (603) fixedly connected to the other end of the linkage rod (602), a frustum (604) movably connected to the shaft tube (203), a gear table (605) and a gear ring (606) arranged on the frustum (604), the linkage main bevel gear (601) meshing with an adjacent driven gear (403), the driven bevel gear being used to drive the linkage main bevel gear (601), the linkage rod (602) and the linkage sub-bevel gear (603) to rotate, the linkage sub-bevel gear (603) meshing with the gear table (605), and the linkage sub-bevel gear (603) being used to drive the frustum (604) to rotate.

6. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 5, characterized in that: The first transmission assembly comprises a first movable main rod (701) whose one end is movably connected to the pre-filter assembly (2), a first side main flat gear (702) fixedly connected to the other end of the first movable main rod (701), a first transmission bevel gear (703) fixedly mounted on the first side main flat gear (702), a first movable sub-rod (704) whose one end is movably connected to the shaft tube (203), a first side sub-flat gear (705) fixedly connected to the other end of the first movable sub-rod (704), and a first side sub-flat gear (706) mounted on the first side sub-flat gear. The turntable (706) on the gear (705) is meshed with the first transmission bevel gear (703) and the gear table (605). The gear table (605) is used to drive the first transmission bevel gear (703), the first side main flat gear (702) and the first movable main rod (701) to rotate. The first side main flat gear (702) is meshed with the first side secondary flat gear (705). The first side main flat gear (702) is used to drive the first side secondary flat gear (705), the first movable secondary rod (704) and the turntable (706) to rotate.

7. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 6, characterized in that: The vibration component comprises a bracket (801) fixedly mounted on the pre-filter component (2), a sliding sleeve (802) fixedly mounted on the bracket (801), a piston rod (803) movably connected in the sliding sleeve (802), a vibration head (804) fixedly mounted on one end of the piston rod (803), and a rocker arm (805) movably connected to the other end of the piston rod (803), the rocker arm (805) being movably connected to an eccentric position of a rotating disk (706), the rotating disk (706) being used to drive the rocker arm (805) to swing, and the rocker arm (805) being used to drive the piston rod (803) and the vibration head (804) to move in a vertical direction.

8. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 7, characterized in that: The air supply assembly comprises a screw sleeve disc (901) threadedly connected to a stud (404), a guide hole (902) provided on the screw sleeve disc (901), an elastic gas cover (903) installed on a back plate (405), and an air supply pipe (904) having one end connected to the elastic gas cover (903), wherein a guide rod (504) is arranged in the guide hole (902), the stud (404) is used to drive the screw sleeve disc (901) to move in a vertical direction, the other end of the air supply pipe (904) is connected to a shaft tube (203), and when the screw sleeve disc (901) is close to the back plate (405), the elastic gas cover (903) discharges gas through the air supply pipe (904); An upper air port (10) and a lower air port (11) are provided on the shaft tube (203); the upper air port (10) outputs the gas in the shaft tube (203) to the filter screen (204); and the lower air port (11) outputs the gas in the shaft tube (203) to the filter tube (205).

9. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 8, characterized in that: A second transmission component, an upper blocking component and a lower blocking component are installed on the pre-filter component (2); the input end of the second transmission component is connected to the output end of the central transmission component, the input end of the upper blocking component is connected to the output end of the second transmission component, the upper blocking component is used to open or close the upper air outlet (10), the input end of the lower blocking component is connected to the output end of the central transmission component, and the lower blocking component is used to open or close the lower air outlet (11); When the main separation channel (209) is opened, the upper air port (10) and the lower air port (11) in the main filter tank (201) are closed, and the upper air port (10) and the lower air port (11) in the auxiliary filter tank (202) are opened; when the auxiliary separation channel (210) is opened, the upper air port (10) and the lower air port (11) in the main filter tank (201) are opened, and the upper air port (10) and the lower air port (11) in the auxiliary filter tank (202) are closed.

10. A dichloromethane separation system based on PC project that can replace centrifugal washing according to claim 9, characterized in that: The second transmission assembly comprises a second movable main rod (1201) with one end movably connected to the pre-filter assembly (2), a second transmission main bevel gear (1202) fixedly mounted on the other end of the second movable main rod (1201), a second movable sub-rod (1203) with one end fixedly connected to the second transmission main bevel gear (1202), and a second transmission sub-bevel gear (1204) mounted on the other end of the second movable sub-rod (1203), the second transmission main bevel gear (1202) being meshed with a gear stand (605), the gear stand (605) being used to drive the second transmission main bevel gear (1202), the second movable main rod (1201), the second movable sub-rod (1203) and the second transmission sub-bevel gear (1204) to rotate, and the second transmission sub-bevel gear (1204) is arranged on the inner side of the shaft tube (203); The upper plugging assembly comprises a screw (1301) with one end movably connected to the shaft tube (203), a shaft (1302) fixedly mounted on the other end of the screw (1301), a transmission bevel gear (1303) mounted on the shaft (1302), a screw sleeve head (1304) threadedly connected to the screw (1301), a support rod (1305) fixedly mounted on the screw sleeve head (1304), and a plugging plate (1306) fixedly mounted on the top of the support rod (1305); the transmission bevel gear (1303) is meshed with a second transmission sub-bevel gear (1204); the second transmission sub-bevel gear (1204) is used to drive the transmission bevel gear (1303), the shaft (1302) and the screw (1301) to rotate; and the screw (1301) is used to drive the screw sleeve head (1304) to move in a vertical direction; When the screw sleeve head (1304) moves upward in the vertical direction, the blocking plate (1306) moves away from the upper air outlet (10); when the screw sleeve head (1304) moves downward in the vertical direction, the blocking plate (1306) moves closer to the upper air outlet (10); The lower plugging assembly comprises a bracket (1401) fixedly mounted on the shaft tube (203), a shaft column (1402) movably connected to the bracket (1401), a transmission flat gear (1403) fixedly mounted on one end of the shaft column (1402), a plug (1404) fixedly mounted on the other end of the shaft column (1402), and a through hole (1405) opened on the plug (1404); the transmission flat gear (1403) is meshed with a gear ring (606); the gear ring (606) is used to drive the transmission flat gear (1403), the shaft column (1402), and the plug (1404) to rotate; the plug (1404) is movably connected in the lower air outlet (11); the plug (1404) is used to open or close the lower air outlet (11).

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