Multi-station automatic back-flushing column screen

Abstract

The application discloses a multi-station automatic back-flushing column type screen changer, which comprises a screen changer main body and a plunger, a back-flushing bin and a back-flushing assembly are arranged in the main body, the back-flushing assembly comprises a rotating beam, a cleaning cavity and the like, steam, water and hot air can be used to clean the filter screen in sequence, a cleaning pipeline is accurately controlled in medium flow direction through a three-way valve, a motor drives a rotating shell in a scraper assembly to drive the scraper to rotate, a reciprocating driving structure is used for reciprocating sliding, impurities are efficiently removed in combination with a scraper groove and the like, an ejection structure is arranged in the plunger, a transmission part is in contact with a pusher frame bottom plate at the beginning, the pusher frame is moved to push a turnover frame to rotate, a supporting leg is used for lifting the filter screen to be attached to the scraper, and the filter screen is reset after being cleaned, the screen changer is combined with multiple cleaning modes through multi-station cooperation, efficient cleaning of the filter screen is realized, the regeneration efficiency of the filter screen is improved, stable operation of equipment is ensured, and the screen changer is suitable for the field of high polymer material processing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screen changers, in particular to a multi-station automatic backwashing column screen changer. BACKGROUND

[0002] In the field of processing of high polymer materials such as plastic extrusion and chemical fiber spinning, melt filtration plays a crucial role in ensuring product quality. As disclosed in the authorized invention CN202310860256 (double-column strong backwashing screen changer), a machine body assembly, a filter assembly, a sealing assembly and a waste discharge assembly are provided, the filter assembly is used to filter raw materials, the positions of the filter assembly and the sealing assembly are adjusted to form a material bin, the raw materials in the material bin enter the inside of the filter assembly through the backwashing return tank, and backwashing of the filter assembly is realized, which to some extent ensures cleaning of the device during operation and maintains work efficiency.

[0003] However, the prior art still has some deficiencies:

[0004] Firstly, the backwashing function only relies on the backflow of raw materials in the material bin, and the cleaning method is relatively single. It is difficult to completely remove the impurities accumulated in the deep layer of the filter screen through this simple backflow method, which limits the regeneration efficiency of the filter screen, and the filtering effect will gradually decrease after long-term use, affecting the stability of the equipment operation.

[0005] Secondly, when the screen changer cleans the filter screen, it lacks comprehensive cleaning means for the filter screen from multiple angles and in multiple ways, and cannot meet the increasingly high requirements of modern production processes for filter screen cleanliness.

[0006] In addition, in actual large-scale production, multi-station cooperative work and comprehensive cleaning of different station filter screens quickly and efficiently are the key to improving production efficiency, and the prior art is difficult to effectively cope with this aspect, limiting the further improvement of production efficiency.

[0007] Therefore, it is of great practical significance to develop a multi-station automatic backwashing column screen changer that can overcome the above-mentioned defects. SUMMARY

[0008] The present application aims to solve one of the technical problems in the prior art.

[0009] The present application provides a multi-station automatic backwashing column screen changer, which comprises a screen changer main body, a plurality of plungers, a plunger cavity, a liquid inlet channel and a liquid outlet channel provided on the screen changer main body, a pre-filter channel and a post-filter channel provided on the plunger, a driving end of the plunger provided with a cylinder, and the other end being a screen changing end with a filter screen, a backwashing bin provided in the screen changer main body, a backwashing assembly provided in the backwashing bin for cleaning the filter screen of the screen changing end of the plunger extending out of the plunger cavity.

[0010] The backwash assembly includes a rotating beam, a cleaning chamber, a cleaning pipeline, a steam generator, a water supply unit, a hot air generator, and a scraper assembly. The rotating beam is rotatably mounted in the backwash chamber. The cleaning chamber is located at the outer end of the rotating beam and aligns with any plunger as the rotating beam rotates. The scraper assembly is located inside the cleaning chamber and is used to scrape the filter surface of the filter screen. The steam generator, water supply unit, and hot air generator are connected to the cleaning chamber through the cleaning pipeline, which allows steam, cleaning water, and hot air to sequentially pass through the pre-filter and post-filter channels of the plungers extending into the cleaning chamber.

[0011] The cleaning pipeline includes a first three-way valve, a second three-way valve, and a third three-way valve. The first and second passages of the first three-way valve are respectively connected to the steam generator and the side wall of the pre-filter channel of the cleaning chamber. The first and second passages of the second three-way valve are respectively connected to the side wall of the post-filter channel of the cleaning chamber and the first passage of the third three-way valve. The third passages of the first and second three-way valves are connected to a discharge pipe. The second and third passages of the third three-way valve are respectively connected to a water supply unit and a hot air generator.

[0012] The scraper assembly includes a scraper cavity, a rotating shell, a motor, a pair of scrapers, and a reciprocating drive structure. The scraper cavity is located on the inner wall of the cleaning chamber corresponding to the pre-filter channel. The rotating shell includes a circular shell and an inner plate, which are rotatably installed in the scraper cavity. The pair of scrapers are movably installed on the side of the inner plate facing the pre-filter channel via the reciprocating drive structure. The motor drives the rotating shell to rotate, and the reciprocating drive structure simultaneously controls the reciprocating sliding of the scrapers.

[0013] The top surface of the scraper is provided with a groove, and several through holes are opened at the bottom of the groove. A through groove communicating with the groove is opened on the inner plate.

[0014] The reciprocating drive structure includes a transmission ring groove disposed in the scraper cavity, with several protrusions spaced apart in the transmission ring groove, and recesses formed between adjacent protrusions. A transmission shell is fixed on the top surface of the inner plate, with the inner end of the transmission shell closed, the outer end of the inner cavity connected to the outer wall of the circular shell, and the inner end of the bottom connected to the bottom surface of the inner plate. A sliding frame is fixed on the top surface of the scraper, with a pre-tightening spring at the inner end of the sliding frame and the outer end extending into the transmission ring groove to slide in cooperation with each protrusion and recess.

[0015] It also includes an ejector structure, which is located inside the plunger and connected to the outer end of the piston rod of the cylinder. After the screen-changing end of the plunger extends into the cleaning chamber, it lifts the filter screen so that the filter surface of the filter screen fits against the scraper assembly.

[0016] The ejection structure includes a transmission chamber, a pushing frame, a tilting frame, an elastic element, and a pair of support legs. The transmission chamber is located inside the plunger, and the pair of support legs are fixed to the bottom surface of the filter screen. The piston rod of the cylinder is connected to the pushing frame. The tilting frame is rotatably installed in the transmission chamber via a hinge shaft. One end is movably connected to each support leg, and the other end is connected to the tilting frame via a transmission. The elastic element is used to assist the pushing frame in moving away from the tilting frame. When the piston rod of the cylinder extends / retracts, the pushing frame moves and controls the tilting frame to tilt around the hinge shaft, causing each support leg to rise / fall.

[0017] The tilting frame includes a tilting part, a pair of linkage parts, and a transmission part. The tilting part is rotatably mounted in the transmission cavity via a hinge shaft. The pair of linkage parts are symmetrically fixed at both ends of the same side of the tilting part, and the free ends have long grooves. The transmission part is fixed in the middle of the other side of the tilting part, and the free end extends downwards to cooperate with the tilting frame in transmission. The side walls of the legs are provided with sliders that slide in cooperation with the long grooves.

[0018] The pushing frame includes a base plate and an upright plate connected to each other. The upright plate is fixed to the outer end of the piston rod of the cylinder. A transmission groove is opened on the base plate. The upper end of the transmission groove away from the piston rod extends inclined towards the tilting frame. When the free end of the transmission part enters / exits the transmission groove, the free end of the linkage part is raised / lowered.

[0019] The elastic element includes a partition plate fixed in the middle of the transmission cavity, a return spring between the partition plate and the vertical plate, and sliding friction between the bottom end of the partition plate and the top surface of the bottom plate.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. Excellent cleaning effect: This invention combines multiple cleaning methods such as steam cleaning, water rinsing, hot air drying, and scraper wiping, which can thoroughly clean the filter screen from multiple angles and using multiple means, effectively removing deep impurities from the filter screen, improving the filter screen regeneration efficiency, and ensuring the filtration effect of the equipment.

[0022] 2. High efficiency through multi-station collaboration: The design of the rotating beam and cleaning chamber enables automatic switching and cleaning of multiple plunger filters, meeting the needs of multi-station collaborative work, greatly improving cleaning efficiency, reducing equipment downtime, and enhancing overall production efficiency.

[0023] 3. Ingenious and stable structure: The clever cooperation between the ejector structure and the scraper assembly ensures that the filter screen fits tightly with the scraper during the cleaning process, guaranteeing the scraping cleaning effect; at the same time, the transmission structure between the components is reasonably designed, ensuring stable and reliable operation and extending the service life of the equipment.

[0024] 4. High adaptability: It can be applied to a variety of polymer material processing scenarios, meet the requirements of different production processes for filter cleanliness, and has a wide range of application prospects. Attached Figure Description

[0025] Figure 1 This is a front view of the multi-station automatic backwashing column screen changer in the embodiments of this application;

[0026] Figure 2 This is a right view of the multi-station automatic backwashing column screen changer in the embodiments of this application;

[0027] Figure 3This is a top view of the multi-station automatic backwashing column screen changer in the embodiments of this application;

[0028] Figure 4 This is a perspective view of the backwashing assembly in an embodiment of this application;

[0029] Figure 5 This is a perspective view of the backwashing assembly in an embodiment of this application (cut longitudinally from the center).

[0030] Figure 6 This is a perspective view (partially cut open at the top) of the backwashing assembly in an embodiment of this application.

[0031] Figure 7 This is a perspective view of the rotating beam in an embodiment of this application (cut longitudinally in a stepped manner).

[0032] Figure 8 This is a perspective view of the rotating beam in an embodiment of this application (divided horizontally from the middle);

[0033] Figure 9 This is a perspective view (top view) of the scraper assembly in an embodiment of this application;

[0034] Figure 10 This is a perspective view (longitudinal section) of the scraper assembly in an embodiment of this application.

[0035] Figure 11 This is a perspective view (bottom view) of the scraper assembly in an embodiment of this application.

[0036] Figure 12 This is a perspective view of the plunger in the embodiment of this application (longitudinal section with ejector structure);

[0037] Figure 13 This is a perspective view of the ejector structure in an embodiment of this application;

[0038] Figure 14 This is a perspective view (longitudinal section) of the plunger in the embodiment of this application;

[0039] Figure 15 This is a diagram showing the connection of the cleaning pipeline in an embodiment of this application.

[0040] Figure Labels

[0041] 1-Screw changer body, 2-Plunger, 21-Pre-filter channel, 22-Post-filter channel, 23-Filter screen, 3-Inlet channel, 4-Outlet channel, 5-Cylinder, 6-Backwash chamber, 7-Backwash assembly, 71-Rotating beam, 72-Cleaning chamber, 73-Cleaning pipeline, 731-First three-way valve, 732-Second three-way valve, 733-Third three-way valve, 734-Discharge pipe, 735-Upper pipeline, 736-Lower pipeline, 74-Steam generator, 75-Water supply unit, 76-Hot air generator, 8-Scraper assembly, 81-Scraper cavity, 82-Rotating shell, 821-Circular shell, 822-Inner plate 83-Scraper, 831-Groove, 832-Through Hole, 833-Through Slot, 84-Reciprocating Drive Structure, 841-Transmission Arc Slot, 842-Protrusion, 843-Recess, 844-Transmission Housing, 845-Sliding Frame, 846-Preload Spring, 9-Ejection Structure, 91-Transmission Cavity, 92-Push Frame, 921-Base Plate, 922-Upright Plate, 923-Transmission Slot, 93-Tilting Frame, 931-Tilting Part, 932-Linkage Part, 933-Transmission Part, 934-Long Slot, 935-Slider, 94-Elastic Component, 941-Partition Plate, 942-Reset Spring, 95-Support Leg. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0043] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0044] The multi-station automatic backwashing column screen changer provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0045] Example 1:

[0046] This application provides a multi-station automatic backwashing column screen changer, including a screen changer body 1 and several plungers 2. The screen changer body 1 is provided with a plunger cavity, a liquid inlet channel 3, and a liquid outlet channel 4. The plungers 2 are provided with a pre-filter channel 21 and a post-filter channel 22. The driving end of the plunger 2 is provided with a cylinder 5, and the other end is a screen changing end with a filter screen 23. The screen changer body 1 is provided with a backwashing chamber 6, and the backwashing chamber 6 is provided with a backwashing component 7 for cleaning the filter screen 23 of the screen changing end of the plunger 2 that extends out of the plunger cavity.

[0047] In this embodiment of the application, the backwash assembly 7 includes a rotating beam 71, a cleaning chamber 72, a cleaning pipeline 73, a cleaning pipeline 74, a water supply 75, a hot air generator 76, and a scraper assembly 8. The rotating beam 71 is rotatably mounted in the backwash chamber 6. The cleaning chamber 72 is located at the outer end of the rotating beam 71 and is aligned with any plunger 2 as the rotating beam 71 rotates. The scraper assembly 8 is located inside the cleaning chamber 72 and is used to scrape the filter surface of the filter screen 23. The cleaning pipeline 74, the water supply 75, and the hot air generator 76 are connected to the cleaning chamber 72 through the cleaning pipeline 73, so that steam, clean water flow, and hot air pass sequentially through the pre-filter channel 21 and the post-filter channel 22 of the plunger 2 that extends into the cleaning chamber 72.

[0048] like Figures 1 to 15 As shown, due to the above structure, when the filter screen 23 clogging detection device of the screen changer (such as a differential pressure sensor, installed between the inlet channel 3 and the outlet channel 4, and when it detects that the pressure difference before and after the filter screen 23 exceeds the preset threshold of 0.5MPa, it is determined that the filter screen 23 needs to be cleaned) detects that the filtration effect of the filter screen 23 of a certain plunger 2 has decreased and needs to be cleaned, the control system (using a PLC controller, with a pre-written cleaning program) issues an instruction to start the cleaning process.

[0049] First, the servo motor connected to the rotating beam 71 receives pulse signals from the control system, and the motor starts running, driving the rotating beam 71 to rotate clockwise or counterclockwise around its central axis in the backwash chamber 6. The rotation angle of the rotating beam 71 is precisely controlled by an absolute encoder installed on the motor output shaft, ensuring that the cleaning chamber 72 can move to the position of the plunger 2 of the filter screen 23 that needs to be cleaned with a positioning accuracy of ±1mm and be precisely aligned.

[0050] After the rotating beam 71 drives the cleaning chamber 72 to rotate into position, the double-acting cylinder 5 connected to the drive end of the plunger 2 begins to work. When the two-position five-way solenoid valve of the cylinder 5 is energized and reversed, 0.6MPa compressed air enters the rodless chamber of the cylinder 5 through the air pipe, pushing the piston and the piston rod connected to it to extend outward at a speed of 0.3m / s. The outer end of the piston rod is connected to the drive end of the plunger 2 by a high-strength bolt, thereby driving the plunger 2 to move into the cleaning chamber 72 along the axial direction of the plunger chamber. During the movement of the plunger 2, the linear sliding bearing installed between the plunger 2 and the inner wall of the plunger chamber ensures the smoothness and straightness of its movement. This bearing is made of self-lubricating engineering plastic, which can effectively reduce frictional resistance and prevent the plunger 2 from deviating during movement.

[0051] Once the screen-changing end of plunger 2 is fully inserted into cleaning chamber 72, cleaning pipeline 74 begins operation. The electric heating element inside cleaning pipeline 74 is energized and heats up, rapidly heating the water in the built-in water tank (50L capacity) to 170℃, generating high-temperature, high-pressure steam. This steam is transported through cleaning pipeline 73, which is made of 304 stainless steel with an outer diameter of 25mm and a wall thickness of 3mm. The pipeline connections are welded and fitted with high-temperature resistant sealing rings (made of fluororubber, temperature range -20℃ to 200℃). The steam first enters a branch of cleaning pipeline 73 connected to cleaning pipeline 74. This branch is tightly connected to the interface on the pre-filter channel 21 side of cleaning chamber 72 via a flange. The steam enters the pre-filter channel 21 of plunger 2 from cleaning chamber 72, flows through filter screen 23 at a flow rate of 15m / s, and then exits from post-filter channel 22, utilizing its high-temperature characteristics to perform preliminary cleaning of impurities adhering to filter screen 23. High temperatures soften some sticky impurities, reducing their adhesion to filter screen 23. Simultaneously, the steam flow also has a flushing effect on the impurities, carrying away some loosened debris and preparing for subsequent cleaning steps. The steam cleaning process lasts 30 seconds, controlled by a timer in the control system.

[0052] After steam cleaning is completed, the heating in the cleaning pipeline 74 is stopped, and the electric shut-off valve in the steam pipeline is closed. At this time, the water supply unit 75 is started, and the centrifugal pump draws out the cleaning water from the water tank and delivers it to the cleaning chamber 72 through the cleaning pipeline 73. The cleaning water delivery pipeline is also made of 304 stainless steel and is connected to the interface on the side of the post-filter channel 22 of the cleaning chamber 72 through a quick connector. Under the action of 0.3MPa pressure, the cleaning water enters from the post-filter channel 22 at a flow rate of 8m / s, and passes through the filter screen 23 and the pre-filter channel 21 of the plunger 2 in sequence to thoroughly rinse the filter screen 23. The rinsing force of the cleaning water is stronger than that of steam, which can completely wash away the softened impurities remaining after steam cleaning, so that most of the impurities on the surface of the filter screen 23 are cleaned. The water rinsing process lasts for 45 seconds and is precisely controlled by the control system.

[0053] After the water flushing is completed, the water supply unit 75 stops working, the water pump and pipeline valves are closed, and the hot air generator 76 starts. The heating element inside the hot air generator 76 heats the intake air to 120°C. The heated hot air is delivered to the cleaning chamber 72 through the cleaning pipeline 73, enters from the post-filter channel 22, and then passes through the filter screen 23 and the pre-filter channel 21 of the plunger 2. The filter screen 23 is dried at a flow rate of 12 m / s. The function of the hot air is twofold: firstly, to remove residual moisture on the filter screen 23, preventing moisture from remaining on the filter screen 23 and causing rust or affecting the subsequent filtration effect; secondly, the flow of hot air can further blow away any fine impurities that may remain on the surface of the filter screen 23, so that the filter screen 23 achieves a better clean and dry state. The hot air drying process lasts for 60 seconds, and the time is controlled by the control system.

[0054] Example 2:

[0055] The difference from Embodiment 1 is that, in this embodiment, in addition to including the structural features of the aforementioned embodiments, the cleaning pipeline 73 includes a first three-way valve 731, a second three-way valve 732, and a third three-way valve 733. The first passage and the second passage of the first three-way valve 731 are respectively connected to the cleaning pipeline 74 and the side wall of the cleaning chamber 72 corresponding to the pre-filter channel 21. The first passage and the second passage of the second three-way valve 732 are respectively connected to the side wall of the cleaning chamber 72 corresponding to the post-filter channel 22 and the first passage of the third three-way valve 733. The third passage of the first three-way valve 731 and the second three-way valve 732 are connected to the discharge pipe 734. The second passage and the third passage of the third three-way valve 733 are respectively connected to the water supply device 75 and the hot air generator 76.

[0056] like Figure 7 , Figure 8 and Figure 15 As shown, due to the above-mentioned structure, during the steam cleaning stage, the control system sends an electrical signal to the first three-way valve 731, causing the valve core to move to a specific position, thus opening the passage between the cleaning pipeline 74 and the pre-filter channel 21 side of the cleaning chamber 72. The 170°C, 0.7MPa high-temperature and high-pressure steam generated by the cleaning pipeline 74 enters the cleaning chamber 72 along this passage, and then completes the cleaning through the pre-filter channel 21, filter screen 23, and post-filter channel 22 of the plunger 2. The waste steam is discharged from the third passage of the first three-way valve 731 into the discharge pipe 734 at a flow rate of 10m / s. The discharge pipe 734 is a PVC pipe with an outer diameter of 50mm, connected to a 200L wastewater collection tank. The tank is equipped with a liquid level sensor, which issues an alarm signal to prompt cleaning when the liquid level reaches 80%.

[0057] After steam cleaning is completed, ensure that the connection between the third passage and the discharge pipe 734 remains unchanged to drain the residual steam in the cleaning pipe 73 and the cleaning chamber 72. The evacuation time is set to 15 seconds. Subsequently, the control system sends an electrical signal to the first three-way valve 731, switching the valve core position and closing the passage between the cleaning pipeline 74 and the cleaning chamber 72. Simultaneously, the valve core of the third three-way valve 733 actuates, connecting the water supply unit 75 to the cleaning pipeline 73. The centrifugal pump in the water supply unit 75 starts, delivering clean water to the cleaning chamber 72 through the third three-way valve 733 and the second three-way valve 732. The clean water flows in from the post-filter channel 22 at a pressure of 0.3 MPa, passes through the filter screen 23, and flows out from the pre-filter channel 21. The rinsing wastewater is discharged into the discharge pipe 734 through the third passage of the second three-way valve 732 at a flow rate of 6 m / s. During the water rinsing stage, the second three-way valve 732 plays a crucial role in switching the passage and controlling wastewater discharge, ensuring that the clean water can smoothly pass through the filter screen 23 and that the rinsed wastewater is discharged promptly, guaranteeing the efficient operation of the cleaning process. The water rinsing process lasts for 45 seconds. After completion, the control system controls the third three-way valve 733. The valve core switches positions again, closing the passage between the water supply unit 75 and the cleaning pipeline 73. At the same time, the hot air generator 76 is connected to the cleaning pipeline 73. The hot air generator 76 starts, and the generated 120°C hot air enters the cleaning chamber 72 through the third three-way valve 733 and the second three-way valve 732. Then, it dries the filter screen 23 through the post-filter channel 22, filter screen 23, and pre-filter channel 21 of the plunger 2. During the hot air drying stage, the second three-way valve 732 continues to maintain its passage switching function to ensure that the hot air can pass smoothly through the filter screen 23 and blow away the residual moisture on the filter screen 23. At the same time, the connection between the third passage of the first three-way valve 731 and the second three-way valve 732 and the discharge pipe 734 remains unchanged so as to discharge the small amount of water vapor and residual impurities that may be generated during the hot air drying process. Through the precise control of the three three-way valves, the delivery path of different cleaning media can be flexibly switched to ensure that each cleaning step is carried out in an orderly manner, thereby improving cleaning efficiency and quality.

[0058] The cleaning pipeline 73 is partially installed inside the rotating beam 71, including an upper pipeline 735 and a lower pipeline 736. One end of the upper pipeline 735 is connected to one side of the cleaning chamber 72 corresponding to the pre-filter channel 21, and the other end is connected to the first passage of the first three-way valve 731 through a hose. The lower pipeline 736 is connected to one side of the cleaning chamber 72 corresponding to the post-filter channel 22, and the other end is connected to the first passage of the second three-way valve 732 through a hose.

[0059] Example 3:

[0060] The difference from Embodiment 2 is that, in this embodiment, in addition to including the structural features of the aforementioned embodiments, the scraper assembly 8 includes a scraper cavity 81, a scraper cavity 82, a motor, a pair of scrapers 83, and a reciprocating drive structure 84. The scraper cavity 81 is disposed on the inner wall of the cleaning cavity 72 corresponding to the pre-filter channel 21. The scraper cavity 82 includes a circular shell 821 and an inner plate 822, which are rotatably installed in the scraper cavity 81. The pair of scrapers 83 are movably installed on the side of the inner plate 822 facing the pre-filter channel 21 through the reciprocating drive structure 84. The motor drives the scraper cavity 82 to rotate, and the reciprocating drive structure 84 simultaneously controls the scrapers 83 to slide back and forth.

[0061] In this embodiment of the application, the top surface of the scraper 83 is provided with a groove 831, the bottom of the groove 831 is provided with a plurality of through holes 832, and the inner plate 822 is provided with a through groove 833 communicating with the groove 831.

[0062] In this embodiment of the application, the reciprocating drive structure 84 includes a transmission arc groove 841 disposed in the scraper cavity 81. A plurality of protrusions 842 are spaced apart in the transmission arc groove 841, and a recess 843 is formed between adjacent protrusions 842. A transmission shell 844 is fixed on the top surface of the inner plate 822. The inner end of the transmission shell 844 is closed, the outer end of the inner cavity is connected to the outer wall of the circular shell 821, and the inner end of the bottom is connected to the bottom surface of the inner plate 822. A sliding frame 845 is fixed on the top surface of the scraper 83. A pre-tension spring 846 is provided at the inner end of the sliding frame 845, and the outer end extends into the transmission arc groove 841 and slides with each protrusion 842 and recess 843.

[0063] like Figure 6 , Figures 9 to 11 As shown, due to the above structure, the scraper assembly 8 works synchronously throughout the entire steam cleaning, water rinsing, and hot air drying process. The DC servo motor in the scraper assembly 8 starts, and the output shaft of the motor is connected to the central shaft of the scraper cavity 82 through a precision planetary reducer and coupling, driving the scraper cavity 82 to rotate around its central shaft at a speed of 300 rpm within the scraper cavity 81. A pair of scrapers 83 installed on the inner plate 822 of the scraper cavity 82 rotate synchronously. The scrapers 83 are made of high-strength wear-resistant engineering plastic (material POM, hardness up to 80HRR), and their edges maintain a 0.1mm gap in close contact with the filter surface of the filter screen 23. During the rotation, they scrape the filter surface of the filter screen 23 in a circumferential direction, scraping off stubborn impurities on the filter screen 23 that are difficult to remove by steam and water.

[0064] Meanwhile, the sliding frame 845 fixed on the top surface of the scraper 83, under the action of the protrusion 842 and the recess 843 in the transmission arc groove 841, and with the assistance of the pre-tension spring 846 (spring stiffness coefficient 5N / mm), achieves reciprocating horizontal sliding. When the outer end of the sliding frame 845 moves upward along the protrusion 842 in the transmission arc groove 841, the pre-tension spring 846 is compressed. When the outer end of the sliding frame 845 slides into the recess 843, the pre-tension spring 846 releases elastic potential energy, so that the scraper 83 can also perform horizontal reciprocating motion at a frequency of 2Hz along the radial direction of the filter screen 23 while rotating, thereby achieving all-round scraping and cleaning of the filter surface of the filter screen 23, which greatly improves the cleaning effect of the filter screen 23.

[0065] The groove 831 (13mm deep) on the top surface of the scraper 83, the through hole 832 (5mm in diameter) at the bottom of the groove 831, and the through groove 833 (20mm wide) on the inner plate 822 play important roles in the cleaning process. When the scraper 83 scrapes the filter screen 23, the scraped-off impurities are discharged from the cleaning chamber 72 along with the cleaning medium at a flow rate of 5m / s. Steam first enters the scraper chamber 81, and then passes through the through groove 833, the groove 831, and the through hole 832 into the pre-filter channel. 21. The scraper 83 rotates at a speed of 300 rpm and slides back and forth at a frequency of 2 Hz to help loosen impurities and facilitate steam softening. When the cleaning water is used for backwashing, the scraper 83 further pushes the impurities out with the water flow at a flow rate of 8 m / s. When the hot air is used for drying, the scraper 83 (with several scraper strips spaced apart on the bottom surface of the scraper 83, the extension direction of the scraper strips being perpendicular to the movement direction of the scraper 83) removes residual impurities, and the hot air blows the impurities away at a flow rate of 12 m / s. The three work together to improve the cleaning effect.

[0066] Example 4:

[0067] The difference from Embodiment 3 is that, in addition to the structural features of the aforementioned embodiments, this embodiment also includes an ejector structure 9, which is disposed inside the plunger 2 and connected to the outer end of the piston rod of the cylinder 5. After the screen-changing end of the plunger 2 extends into the cleaning chamber 72, it lifts the filter screen 23 so that the filter surface of the filter screen 23 adheres to the scraper assembly 8.

[0068] In this embodiment of the application, the ejection structure 9 includes a transmission cavity 91, a pushing frame 92, a flipping frame 93, an elastic element 94, and a pair of support legs 95. The transmission cavity 91 is disposed in the plunger 2, and the pair of support legs 95 are fixed to the bottom surface of the filter screen 23. The piston rod of the cylinder 5 is connected to the pushing frame 92. The flipping frame 93 is rotatably installed in the transmission cavity 91 via a hinge shaft. One end is movably connected to each support leg 95, and the other end is drively connected to the flipping frame 93. The elastic element 94 is used to assist the pushing frame 92 in moving away from the flipping frame 93. When the piston rod of the cylinder 5 extends / retracts, the pushing frame 92 moves and controls the flipping frame 93 to flip around the hinge shaft, so that each support leg 95 rises / falls.

[0069] In this embodiment of the application, the flipping frame 93 includes a flipping part 931, a pair of linkage parts 932 and a transmission part 933. The flipping part 931 is rotatably installed in the transmission cavity 91 via a hinge shaft. The pair of linkage parts 932 are symmetrically fixed at both ends of the flipping part 931 on the same side, and the free end has a long groove 934. The transmission part 933 is fixed in the middle of the other side of the flipping part 931, and the free end extends downward at an angle for transmission cooperation with the flipping frame 93. The side wall of the support leg 95 is provided with a slider 935 that slides in cooperation with the long groove 934.

[0070] In this embodiment of the application, the pusher frame 92 includes a base plate 921 and an upright plate 922 connected to each other. The upright plate 922 is fixedly connected to the outer end of the piston rod of the cylinder 5. A transmission groove 923 is provided on the base plate 921. The upper end of the end face of the transmission groove 923 away from the piston rod extends obliquely toward the tilting frame 93. When the free end of the transmission part 933 enters / exits the transmission groove 923, the free end of the linkage part 932 is raised / lowered.

[0071] In this embodiment of the application, the elastic element 94 includes a partition 941 fixed in the middle of the transmission cavity 91, a return spring 942 is provided between the partition 941 and the upright plate 922, and the bottom end of the partition 941 slides and rubs against the top surface of the bottom plate 921.

[0072] like Figures 12 to 14As shown, due to the above structure, when cylinder 5 operates, its piston rod extends, pushing the screen-changing end of plunger 2 into the cleaning chamber 72 and pressing against the inner end of the cleaning chamber 72. Then, the piston rod of cylinder 5 continues to extend at a speed of 0.3 m / s, driving the pusher frame 92 to move. The vertical plate 922 of the pusher frame 92 is fixedly connected to the outer end of the piston rod of cylinder 5 by four M8 high-strength bolts, ensuring reliable force transmission. A transmission groove 923 is provided on the bottom plate 921 of the pusher frame 92. The transmission groove 923 is CNC milled, with a groove depth of 8 mm and an angle of 30° between the bottom of the groove and the horizontal plane. The upper end of the end face away from the piston rod extends inclined towards the tilting frame 93. When the pusher frame 92 moves closer to the filter screen 23 along with the piston rod, the free end of the bottom plate 921 pushes the linkage part 932 of the tilting frame 93, causing the linkage part 932, the tilting part 931, and the transmission part 933 to rotate together around the hinge shaft. The linkage part 932's free end... As the transmission part 933 is lifted from the end, its free end gradually approaches and enters the transmission groove 923 until the flipping part 931 and the linkage part 932 are parallel to the base plate 921. The outer inclined surface of the transmission part 933 engages with the non-inclined end surface of the transmission groove 923. As the pusher 92 moves, the free end of the transmission part 933 descends, and the free end of the linkage part 932 rises. The slider 935 slides in the groove while simultaneously driving the support leg 95 to rise. When the flipping frame 93 retracts, the inclined end surface of the transmission groove 923 engages with the inclined surface on the inner side of the transmission part 933, causing the flipping frame 93 to flip around the hinge shaft. The free end of the transmission part 933 rises, and the free end of the linkage part 932 descends. The slider 935 slides in the groove while simultaneously driving the support leg 95 to descend, until the free end of the transmission part 933 disengages from the transmission groove 923 and abuts against the top surface of the base plate 921. The free end of the linkage part 932 descends to its lowest position.

[0073] The hinge shaft (10mm in diameter, made of stainless steel 304) of the tilting frame 93 is installed in the transmission cavity 91 through two deep groove ball bearings (model 6200) to ensure that the tilting frame 93 rotates flexibly.

[0074] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0075] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A multi-station automatic backwashing column screen changer, comprising a screen changer body and several plungers, wherein the screen changer body is provided with a plunger cavity, a liquid inlet channel, and a liquid outlet channel, and each plunger is provided with a pre-filtration channel and a post-filtration channel, wherein the driving end of each plunger is provided with a cylinder, and the other end is a screen changing end with a filter screen, characterized in that, The screen changer body is equipped with a backwash chamber, and the backwash chamber is equipped with a backwashing component for cleaning the screen at the screen changing end of the plunger that extends out of the plunger cavity. The backwash assembly includes a rotating beam, a cleaning chamber, a cleaning pipeline, a steam generator, a water supply unit, a hot air generator, and a scraper assembly. The rotating beam is rotatably mounted in the backwash chamber. The cleaning chamber is located at the outer end of the rotating beam and aligns with any plunger as the rotating beam rotates. The scraper assembly is located inside the cleaning chamber and is used to scrape the filter surface of the filter screen. The steam generator, water supply unit, and hot air generator are connected to the cleaning chamber through the cleaning pipeline, which allows steam, cleaning water, and hot air to sequentially pass through the pre-filter and post-filter channels of the plungers extending into the cleaning chamber. The scraper assembly includes a scraper cavity, a rotating shell, a motor, a pair of scrapers, and a reciprocating drive structure. The scraper cavity is located on the inner wall of the cleaning chamber corresponding to the pre-filter channel. The rotating shell includes a circular shell and an inner plate, which are rotatably installed in the scraper cavity. The pair of scrapers are movably installed on the side of the inner plate facing the pre-filter channel through the reciprocating drive structure. The motor drives the rotating shell to rotate, and the reciprocating drive structure simultaneously controls the scrapers to slide back and forth. The reciprocating drive structure includes a transmission ring groove disposed in the scraper cavity, with a number of protrusions spaced apart in the transmission ring groove, and recesses formed between adjacent protrusions. A transmission shell is fixed on the top surface of the inner plate, with the inner end of the transmission shell closed, the outer end of the inner cavity connected to the outer wall of the circular shell, and the inner end of the bottom connected to the bottom surface of the inner plate. A sliding frame is fixed on the top surface of the scraper, with a pre-tightening spring at the inner end of the sliding frame and the outer end extending into the transmission ring groove to slide and cooperate with each protrusion and recess.

2. The multi-station automatic backwashing column screen changer according to claim 1, characterized in that, The cleaning pipeline includes a first three-way valve, a second three-way valve, and a third three-way valve. The first passage and the second passage of the first three-way valve are respectively connected to the steam generator and the side wall of the pre-filter channel of the cleaning chamber. The first passage and the second passage of the second three-way valve are respectively connected to the side wall of the post-filter channel of the cleaning chamber and the first passage of the third three-way valve. The third passages of the first three-way valve and the second three-way valve are connected to a discharge pipe. The second passage and the third passage of the third three-way valve are respectively connected to a water supply unit and a hot air generator.

3. A multi-station automatic backwashing column screen changer according to claim 1, characterized in that, The scraper has a groove on its top surface, and several through holes are opened at the bottom of the groove. The inner plate has a through groove that communicates with the groove.

4. A multi-station automatic backwashing column screen changer according to claim 1, characterized in that, It also includes an ejector structure, which is located inside the plunger and connected to the outer end of the piston rod of the cylinder. After the screen-changing end of the plunger extends into the cleaning chamber, it lifts the filter screen so that the filter surface of the filter screen fits against the scraper assembly.

5. A multi-station automatic backwashing column screen changer according to claim 4, characterized in that, The ejection structure includes a transmission cavity, a pushing frame, a tilting frame, an elastic element, and a pair of support legs. The transmission cavity is located inside the plunger, and the pair of support legs are fixed to the bottom surface of the filter screen. The piston rod of the cylinder is connected to the pushing frame. The tilting frame is rotatably installed in the transmission cavity via a hinge shaft. One end is movably connected to each support leg, and the other end is drively connected to the tilting frame. The elastic element is used to assist the pushing frame in moving away from the tilting frame. When the piston rod of the cylinder extends / retracts, the pushing frame moves and controls the tilting frame to tilt around the hinge shaft, causing each support leg to rise / fall.

6. A multi-station automatic backwashing column screen changer according to claim 5, characterized in that, The flipping frame includes a flipping part, a pair of linkage parts, and a transmission part. The flipping part is rotatably installed in the transmission cavity via a hinge shaft. The pair of linkage parts are symmetrically fixed at both ends of the same side of the flipping part, and the free ends have long grooves. The transmission part is fixed in the middle of the other side of the flipping part, and the free end extends downwards to cooperate with the flipping frame in transmission. The side wall of the support leg is provided with a slider that slides in cooperation with the long groove.

7. A multi-station automatic backwashing column screen changer according to claim 6, characterized in that, The pushing frame includes a base plate and an upright plate connected to each other. The upright plate is fixedly connected to the outer end of the piston rod of the cylinder. A transmission groove is provided on the base plate. The upper end of the transmission groove, away from the piston rod, extends inclined towards the tilting frame. When the free end of the transmission part enters / exits the transmission groove, the free end of the linkage part is raised / lowered.

8. A multi-station automatic backwashing column screen changer according to claim 7, characterized in that, The elastic element includes a partition plate fixed in the middle of the transmission cavity, a return spring between the partition plate and the vertical plate, and sliding friction between the bottom end of the partition plate and the top surface of the bottom plate.

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