A screen deck assembly for papermaking and a screening method thereof

Abstract

The application discloses a screen plate device for papermaking and a screening method thereof, and relates to the technical field of papermaking, which comprises a frame body, a barrel structure fixed to the bottom side of the frame body, a screen plate mechanism arranged at the top opening of the barrel structure, wherein the screen plate mechanism comprises a circular frame, a plurality of grooves radially arranged from the center to the circumference of the circular frame, and sectors between adjacent two grooves form sector-shaped insertion slots, and a plurality of screen plate units which are detachably inserted into the positioning groove parts of the corresponding sector-shaped insertion slots. According to the application, the screen plate body is divided into independent detachable units, so that single-piece replacement is realized without overall disassembly; the support is rotationally driven to rotate the feeding barrel, and the multiple sliding blocks are constrained by the grooves to make circular sweeping along the screen surface, so that the pulp is dynamically replaced and discharged on each screen plate unit, fixed-point impact is avoided, utilization is improved, intermittent recovery periods are provided for each unit, clogging is delayed, and continuous and efficient screening is ensured.

Description

Technical Field

[0001] This invention relates to the field of papermaking technology, specifically to a sieve plate device and its sieving method for papermaking. Background Technology

[0002] In the papermaking industry, pulp screening is one of the key processes determining paper quality. Its core lies in effectively separating fibers and impurities from the pulp using a screen plate device. Existing papermaking screen plate devices typically use an integral structure with the screen plate fixedly installed within a screen frame. The pulp enters through the feed inlet and falls directly onto the screen plate surface for screening. However, these existing screen plate devices have the following shortcomings in practical applications: First, because the sieve plate is an integral structure, after long-term use, if local wear or blockage occurs, it is not possible to replace the damaged area separately; the entire sieve plate must be disassembled and replaced. Secondly, the feeding method of existing devices is mostly fixed-point feeding, and the pulp impacts the same area of ​​the screen plate for a long time. This results in the pulp load on that area being much higher than that on other areas. On the one hand, this causes serious uneven utilization of the screen surface. On the other hand, the concentrated feeding area is prone to blockage first, while other areas are not fully utilized. Furthermore, due to the lack of a dynamic rotation and coverage mechanism for each screen plate area, the screen surface continuously covered by pulp cannot obtain intermittent unloading and recovery time, which accelerates the screen clogging process and makes it difficult to guarantee the screening efficiency for long-term continuous operation. Therefore, a papermaking screen device is provided that enables independent replacement of screen plate units and dynamic rotation of coverage. Summary of the Invention

[0003] The purpose of this invention is to provide a screen plate device and screening method for papermaking. This invention divides the screen plate body into independent and detachable units, enabling single-piece replacement without overall disassembly. The rotating bracket drives the feed barrel to rotate, and the multi-slider is constrained by the groove to sweep around the screen surface, so that the pulp is dynamically and alternately fed to each screen plate unit, avoiding fixed-point impact, improving utilization rate, and providing an intermittent recovery period for each unit, delaying clogging, and ensuring continuous and efficient screening.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a sieve plate device for papermaking, comprising: a frame; a barrel structure fixedly connected to the bottom side of the frame; a sieve plate mechanism installed at the top opening of the barrel structure, the sieve plate mechanism comprising a circular frame, and a plurality of grooves radially opened from the center to the periphery on the circular frame, wherein the sectors between adjacent grooves form a sector-shaped slot, and the inner side of the sector-shaped slot is provided with a positioning groove; and a plurality of sieve plate units detachably inserted into the positioning grooves of the corresponding sector-shaped slots. The system comprises: a screen plate body; a feed hopper structure located above the screen plate mechanism; a multi-slider trajectory assembly located between the feed hopper structure and the groove, with its bottom sliding limit within the groove; and a support rotation mechanism mounted on the frame and connected to the feed hopper structure at its power output end. When the support rotation mechanism drives the feed hopper structure to rotate around its axis, the multi-slider trajectory assembly, constrained by the groove, performs a covering circumferential displacement along the circular frame, alternately covering different screen plate units to perform pulp screening.

[0005] Preferably, the barrel structure includes a tank and a screen layer disposed in the lower part of the tank. The side wall and bottom of the tank below the screen layer are respectively connected to a first discharge pipe and a second discharge pipe. The circular frame includes a base, which is fixedly assembled on the top of the tank, and a tray on the base. The grooves are evenly arranged in a circular array with the axis of the tray as the center, and each groove extends through from the axis to the outer periphery of the circular frame. Each groove can serve as a receiving groove for receiving and guiding the separated pulp overflowing from the edge of the screen plate unit during the screening operation.

[0006] Preferably, each screen plate unit includes an end block, the front end of which is connected to a screen plate interlayer module for multi-layer screening of pulp, and the screen plate interlayer module is fan-shaped to match a fan-shaped slot. The end block is also provided with a collection bin assembly that docks with the end of the groove. The collection bin assembly includes a collection bin, an extension block is fixed to the side wall of the collection bin, a sliding block is slidably installed on the extension block, and an end plate is fixed to the end of the extension block. A first spring is connected between the end plate and the sliding block, and the sliding block is fixed to the side wall of the end block. When the screen plate unit is assembled with the positioning groove, under the connection of the sliding block, the first spring and the end plate, the collection bin docks with the opening end of the groove to receive and collect the screen residue.

[0007] Preferably, the sieve plate sandwich module includes a first sieve plate, a second sieve plate, and a third sieve plate arranged sequentially from top to bottom. The first sieve plate, the second sieve plate, and the third sieve plate are all connected to the same end of the end block, and the other end is in an open state. The overall height of the sieve plate sandwich module increases gradually from the center outwards in a radial direction. The second sieve plate is wavy, and the first sieve plate is located at the top and has a ridge-shaped structure that is raised in the middle and gradually thins on both sides.

[0008] Preferably, the multi-slider trajectory assembly includes a transmission ring, with a plurality of slider units arranged circumferentially on the transmission ring. Each slider unit has a slider body confined within the groove, and the slider body is rotatably mounted on the transmission ring via a rotating shaft. Each slider unit is subjected to a combined action of the linear limiting of the groove and the rotational drive of the feed barrel structure, causing a preset moving point on it to trace a motion trajectory, thereby realizing a covering sweeping action of the feed barrel structure on the screen plate unit. The feed barrel structure includes a feed bin and a connecting cylinder connected sequentially from top to bottom, and the connecting cylinder is connected to the top of the transmission ring.

[0009] Preferably, the frame includes a base frame and a support frame integrally welded to the base frame. The barrel structure is mounted on the base frame. The top of the support frame is equipped with a feed inlet and a feed column connected and communicating with the bottom of the feed inlet. The bottom end of the feed column extends downward into the feed barrel structure. The support rotation mechanism includes a transmission bracket rotatably mounted on the feed column and a belt drive mechanism mounted on the support frame. The belt drive mechanism includes a drive motor, which is fixedly mounted on the support frame via a connecting frame. The output shaft of the feed column is connected to a drive pulley and a driven pulley mounted on the feed column and connected to the transmission bracket. A transmission belt drives between the driven pulley and the drive pulley. The transmission bracket includes a rotating rod that rotates around the feed column as an axis. The outer end of the rotating rod is vertically connected to an upper cantilever and a limiting transmission sleeve connected to the bottom of the upper cantilever. A limiting sliding cross arm is laterally connected to the limiting transmission sleeve, and the inner end of the cross arm is fixedly connected to the side wall of the connecting barrel.

[0010] Preferably, a predetermined gap is provided between the bottom of the transmission ring and the sieve plate mechanism, and the transmission ring is provided with a cutter disc, an annular scraper and a brush structure from the inside to the outside, for shearing, scraping and cleaning the upper surface of the sieve plate unit.

[0011] Preferably, the base is further provided with a locking claw mechanism corresponding to each sector slot position, and the bottom of the outer end of each screen plate unit is further provided with a locking block structure adapted to the locking claw mechanism. When the screen plate unit is assembled with the sector slot, the locking claw mechanism and the locking block structure work together to achieve the locking assembly of the screen plate unit. Each locking claw mechanism includes a locking seat fixed on the base. The locking seat includes an inner cavity and an outer cavity opened sequentially. A transmission block is slidably installed in the outer cavity. An arc groove is opened on the lower surface of the transmission block. A swingable rocker arm is installed in the arc groove through a pin, and a torsion spring is provided between the rocker arm and the pin. The end of the rocker arm is provided with a locking pin, and a transmission lock is fixed on the top of the outer cavity. The transmission lock includes... The guide block and the limiting block form a transmission channel for locking or unlocking the locking pin. The guide block has an inlet ramp, a locking recess, and an outlet ramp along its outer contour. When the transmission block moves towards the guide block, the locking pin enters the locking recess along the inlet ramp to lock. When the transmission block is pressed and pushed a second time, the locking pin moves out of the transmission channel along the locking recess and outlet ramp under the action of the torsion spring, thus unlocking. A bottom block is provided at the inner end of the outer cavity, and a connecting block is provided on the back of the transmission block. A second spring is provided between the guide block and the connecting block. A snap-fit ​​connector is connected to the outer end of the transmission block for fitting with the locking block structure. A handle is also provided at the outer end of the locking block structure.

[0012] Preferably, the slider body has lateral wing protrusions on both sides. The two wing protrusions pass through the through slot on the fan-shaped slot and extend to the edge of the second screen plate to interact with it. When the slider body moves back and forth inside, under the wave-shaped structure of the second screen plate, the wing protrusions on both sides interact with the edge of the second screen plate to generate dynamic vibration.

[0013] A screening method, according to the aforementioned sieve plate device for papermaking, includes the following steps: S1: Insert multiple screen plate units into the positioning slots of the corresponding sector slots, and lock them in place through the cooperation of the locking claw mechanism and the locking block structure to complete the assembly of the entire screen plate body; S2: The pulp to be screened is fed into the feed inlet, and the pulp passes through the feed column and feed bin in sequence into the screening chamber formed by the feed barrel structure, screen plate mechanism and barrel structure. S3: Start the drive motor to drive the transmission bracket and the feeding barrel structure to rotate around the axis, so that the slider of the multi-slider trajectory assembly makes a covering circumferential displacement along the circular frame under the constraint of the groove, and drives the feeding barrel structure to alternately cover the top of different screen plate units to perform pulp screening operation. S4: The slurry after screening enters the lower part of the tank through the sieve plate mechanism, and after being filtered again by the screen layer, it is discharged through the first discharge pipe and the second discharge pipe respectively.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention divides the screen plate body into several independent and detachable screen plate units, which are assembled in a plug-in manner in a fan-shaped slot and positioning groove. When a single screen plate unit is worn or blocked, there is no need to replace the entire screen plate. The bracket rotation mechanism drives the feed barrel structure to rotate around the axis. The bottom end of the multi-slider trajectory component is constrained by radial grooves, so that the feed port performs a covering circumferential sweeping motion along the frame surface, sequentially covering each screen plate unit. This avoids the pulp from being concentrated and impacting the same area for a long time, significantly improving the overall utilization rate of the screen plate. At the same time, the periodic alternation of material discharge from each screen plate unit provides intermittent unloading and recovery time for the covered unit, reducing the instantaneous load, delaying the screen blockage process, and ensuring screening efficiency for long-term continuous operation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 A schematic diagram of a partially disassembled structure; Figure 3 for Figure 2 A second-view 3D structural diagram; Figure 4 for Figure 1 A schematic diagram of the side view structure; Figure 5 for Figure 4 A schematic diagram of the internal structure of the AA section line; Figure 6 for Figure 1 Another schematic diagram of a partially disassembled structure; Figure 7 This is a partial disassembly diagram of the sieve plate mechanism of the present invention; Figure 8 This is a schematic diagram of another partial disassembly of the sieve plate mechanism of the present invention; Figure 9 This is a partially enlarged structural diagram of the belt drive mechanism of the present invention; Figure 10 This is a partial disassembly diagram of the locking gripper mechanism of the present invention; Figure 11 This is a schematic diagram of another partial disassembly of the locking gripper mechanism of the present invention; Figure 12 for Figure 10 A partially enlarged structural diagram; Figure 13This is a top view of the disk frame structure of the present invention; Figure 14 This is a partial disassembly diagram of the sieve plate unit of the present invention.

[0016] In the diagram: 111, base frame; 1112, base; 112, tank body; 1121, screen layer; 113, first discharge pipe fitting; 114, second discharge pipe fitting; 211. Support frame; 212. Connecting frame; 213. Drive motor; 214. Driving pulley; 2141. Driven pulley; 215. Transmission belt; 216. Rotating rod; 217. Upper cantilever; 218. Cross arm; 219. Limiting transmission sleeve; 311. Feed inlet; 312. Feed column; 411. Collection bin; 412. Extension block; 413. Sliding block; 414. End plate; 415. First spring; 611. First sieve plate; 612. Second sieve plate; 613. Third sieve plate; 614. End block; 6141. Locking block structure; 6142. Handle; 711. Lock seat; 7111. Outer cavity; 7112. Inner cavity; 712. Guide block; 7121. Guide ramp; 7122. Locking recess; 7123. Guide ramp; 713. Limiting block; 715. Second spring; 716. Transmission block; 7161. Connecting block; 717. Arc groove; 718. Rocker arm; 719. Locking pin; 720. Snap connector; 721. Bottom block; 811. Feed hopper; 812. Connecting cylinder; 813. Transmission ring; 814. Rotating shaft; 815. Brush body structure; 816. Cutting disc; 817. Annular scraper; 818. Groove; 819. Sliding block; 8191. Side wing protrusion; 8192. Through groove; 821. Positioning groove; 822. Disc frame. Detailed Implementation

[0017] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. The various embodiments of this invention are described in detail below with reference to the accompanying drawings.

[0018] Example 1

[0019] Please see Figures 1 to 14The present invention preferably provides the following technical solution: a screen plate device for papermaking, comprising: a frame; a barrel structure fixed to the bottom side of the frame; a screen plate mechanism installed at the top opening of the barrel structure, the screen plate mechanism including a circular frame and a plurality of grooves 818 radially opened from the center to the periphery on the circular frame, wherein the sector area between two adjacent grooves 818 forms a sector-shaped slot, and a positioning groove 821 is provided on the inner side of the sector-shaped slot; and a plurality of screen plate units detachably inserted into the positioning grooves 821 of the corresponding sector-shaped slots. The screen plate is formed by the following components: a feed hopper structure located above the screen plate mechanism; a multi-slider trajectory assembly located between the feed hopper structure and the groove 818, with its bottom sliding limit located within the groove 818; and a support rotation mechanism installed on the frame with its power output end connected to the feed hopper structure. When the support rotation mechanism drives the feed hopper structure to rotate around its axis, the multi-slider trajectory assembly is constrained by the groove 818 and makes a covering circumferential displacement along the circular frame, alternatingly covering different screen plate units to perform pulp screening.

[0020] In this application, as Figure 1 , 3 As shown, by dividing the entire screen plate body into several independent and detachable screen plate units and assembling them in the fan-shaped slots and positioning grooves 821 of the circular frame, when a single screen plate unit is worn or blocked, it is not necessary to replace the entire screen plate; only the corresponding unit needs to be disassembled and replaced, which greatly shortens the downtime for maintenance. Secondly, when the support rotation mechanism drives the feed hopper structure to rotate around the axis, the bottom end of the multi-slider trajectory component is constrained by the linearity of the radial grooves 818 on the circular frame, causing the feed hopper outlet to perform a covering circumferential sweeping motion along the frame surface, sequentially covering each screen plate unit. This design avoids the pulp from impacting the same area for a long time, significantly improving the overall utilization rate of the screen plate, while effectively preventing local overload or premature fatigue failure. Under the continuous drive of the support rotation mechanism, the feed hopper structure dynamically rotates and covers each screen plate unit, allowing the pulp to periodically and alternately fall above each screen plate unit. This ensures that the screen surface is fully utilized and provides intermittent unloading and recovery time for the covered screen plate units, which helps to reduce the instantaneous load on the screen surface, delay the screen clogging process, and ensure the screening efficiency of long-term continuous operation.

[0021] Furthermore, the barrel structure includes a tank 112 and a screen layer 1121 disposed in the lower part of the tank 112. The side wall and bottom of the tank 112 below the screen layer 1121 are respectively connected to a first discharge pipe 113 and a second discharge pipe 114. The circular frame includes a base 1112, which is fixedly mounted on the top of the tank 112, and a tray 822 disposed on the base 1112. The grooves 818 are evenly arranged in a circular array with the axis of the tray 822 as the center, and each groove 818 extends through from the axis to the outer periphery of the circular frame. Each groove 818 can serve as a receiving groove for receiving and guiding the separated pulp overflowing from the edge of the screen plate unit during the screening operation.

[0022] Through further provided barrel structure, circular frame, such as Figure 1 , 3 As shown in Figures 7 and 8, the circular frame is fixedly assembled on the top of the barrel to form a stable screen plate mounting base. Each groove 818 is evenly arranged in a circular array around the center of the plate frame 822 and extends through the axis to the outer periphery of the circular frame. This not only provides a sliding guide trajectory for the multi-slider trajectory assembly, ensuring that the feed barrel structure can cover the entire screen plate plane, but also allows each groove 818 to serve as a receiving groove to receive and guide the screen residue falling from the edge of the screen plate unit during the screening operation, especially some stringy residues. The design of the groove 818 extending through the axis to the outer periphery of the circular frame allows the screen residue scraped into the groove 818 to be discharged radially along the groove 818 to the outside of the circular frame.

[0023] Example 2

[0024] In another embodiment of the present invention, each screen plate unit includes an end block 614. The end block 614 is connected to a screen plate interlayer module for multi-layer screening of pulp. The screen plate interlayer module is fan-shaped and matches the fan-shaped slot. The end block 614 is also provided with a collection bin assembly that docks with the end of the groove 818. The collection bin assembly includes a collection bin 411. An extension block 412 is fixed to the side wall of the collection bin 411. A sliding block 413 is slidably installed on the extension block 412. An end plate 414 is fixed to the end of the extension block 412. A first spring 415 is connected between the end plate 414 and the sliding block 413. The sliding block 413 is fixed to the side wall of the end block 614. When the screen plate unit is assembled with the positioning groove 821, under the connection of the sliding block 413, the first spring 415 and the end plate 414, the collection bin 411 docks with the opening end of the groove 818 to receive and collect the screen residue.

[0025] In this embodiment, a specific structure of the sieve plate unit is further provided, as follows: Figure 7 , 8As shown, each screen plate unit is connected to the screen plate interlayer module at the front end of the end block 614. The screen plate interlayer module is fan-shaped with matching fan-shaped slots, so that each screen plate unit can be independently inserted into the corresponding fan-shaped slot. When a unit is worn, damaged or blocked, it can be pulled out and replaced individually. At the same time, users can also flexibly select screen plate units with different apertures or layers for combination configuration according to different pulp types or screening accuracy requirements, which improves the versatility and process adaptability of the equipment.

[0026] Furthermore, the sieve plate sandwich module includes a first sieve plate 611, a second sieve plate 612, and a third sieve plate 613 arranged sequentially from top to bottom. The first sieve plate 611, the second sieve plate 612, and the third sieve plate 613 are all connected to the same end of the end block 614, and the other end is in an open state. The overall height of the sieve plate sandwich module increases gradually from the center outwards in a radial direction. The second sieve plate 612 is wavy, and the first sieve plate 611 is located at the top and has a ridge-shaped structure that is raised in the middle and gradually thins on both sides.

[0027] By setting up a screen plate sandwich module, firstly, its overall height increases gradually from the center outwards in a radial direction, so that the pulp forms a downward slope structure from the edge to the center under the combined action of centrifugal force and gravity, which promotes the conveying of pulp along the radial center and reduces the overflow of pulp around the edge. Secondly, with the first screen plate 611 placed at the top and having a ridge-shaped structure that is raised in the middle and gradually thins on both sides, when the pulp falls from the feed bucket structure onto the first screen plate 611, the ridge-shaped raised surface will evenly distribute the pulp to both sides, preventing the pulp from accumulating in the center. Finally, through the multi-layer arrangement of the first screen plate 611, the second screen plate 612, and the third screen plate 613, all three are connected to the same end of the end block 614 with the other end in an open state, forming a multi-layer graded filter layer from top to bottom. As the pulp flows radially from the center outward, it passes through the coarse screen (first screen plate 611), the medium screen (second screen plate 612), and the fine screen (third screen plate 613) in sequence. Fibers and impurities of different particle sizes are intercepted step by step, and qualified pulp finally passes through the lower layer and enters the barrel for collection, realizing the function of multi-stage screening with a single feed.

[0028] Example 3

[0029] In another embodiment of the present invention, the multi-slider trajectory assembly includes a transmission ring 813, with a plurality of slider units arranged circumferentially on the transmission ring 813. Each slider unit has a slider body 819 confined within a groove 818, and the slider body 819 is rotatably mounted on the transmission ring 813 via a rotating shaft 814. Each slider unit is subjected to the combined action of the linear confinement of the groove 818 and the rotational drive of the feed barrel structure, causing a preset moving point on it to trace a motion trajectory, thereby realizing a covering sweeping action of the feed barrel structure on the screen plate unit. The feed barrel structure includes a feed bin 811 and a connecting cylinder 812 connected sequentially from top to bottom, with the connecting cylinder 812 connected to the top of the transmission ring 813.

[0030] Furthermore, the frame includes a base frame 111 and a support frame 211 integrally welded to the base frame 111. The barrel structure is mounted on the base frame 111. The top of the support frame 211 is equipped with a feed inlet 311 and a feed column 312 connected and communicating with the bottom of the feed inlet 311. The bottom end of the feed column 312 extends downward into the feed barrel structure. The support rotation mechanism includes a transmission bracket rotatably mounted on the feed column 312 and a belt drive mechanism mounted on the support frame 211. The belt drive mechanism includes a drive motor 213, which is fixedly mounted on the support frame 211 via the connecting frame 212. The output shaft of the feed column 312 is connected to a drive pulley 214 and a driven pulley 2141 mounted on the feed column 312 and connected to the transmission bracket. A transmission belt 215 is connected between the driven pulley 2141 and the drive pulley 214. The transmission bracket includes a rotating rod 216, which rotates around the feed column 312. An upper cantilever 217 is vertically connected to the outer end of the rotating rod 216. A limiting transmission sleeve 219 is connected to the bottom of the upper cantilever 217. A horizontal arm 218 with limiting sliding is connected laterally to the limiting transmission sleeve 219. The inner end of the horizontal arm 218 is fixedly connected to the side wall of the connecting cylinder 812.

[0031] In this embodiment, a multi-slider trajectory component and its driving component are provided, specifically, as follows: Figure 8 As shown, the multi-slider trajectory assembly includes a transmission ring 813 and several slider units arranged circumferentially. The slider body 819 of each slider unit is limited in the groove 818 and is rotatably mounted on the transmission ring 813 through the rotating shaft 814. Under the combined action of the bracket rotation mechanism and the linear limiting of the groove 818, the slider body 819 slides back and forth along the radial groove 818, driving the feed bucket structure to trace a covering motion trajectory on the screen plate plane, realizing the sequential rotation and covering of each screen plate unit on the circular frame. This motion mode ensures that the pulp drop point traverses the entire screen plate surface without omission, fundamentally solving the problem of uneven screen surface load caused by traditional fixed-point feeding, so that each screen plate unit is used evenly and the screening effect is consistent. Driven by the rotating support mechanism, each slider unit passes through each groove 818 in sequence, causing the feed barrel structure to rotate circumferentially while generating radial displacement. This alternating feeding method provides buffer time for slurry penetration and drainage for each covered screen plate unit, avoiding continuous impact of slurry on the same area, which could lead to screen overload or poor slurry penetration, and is conducive to improving the full separation rate of a single screening. Furthermore, the rotating support mechanism includes a belt drive mechanism. The drive motor 213 transmits power to the transmission support via a driving pulley 214, a transmission belt 215, and a driven pulley 2141. The transmission support includes a rotating rod 216, with an upper cantilever 217 vertically connected to its outer end. A limiting transmission sleeve 219 is connected to the bottom of the upper cantilever 217, and a limiting sliding cross arm 218 is laterally connected to the limiting transmission sleeve 219. The inner end of the cross arm 218 is fixedly connected to the side wall of the connecting cylinder 812. Figure 1 As shown, due to the limiting transmission of the multi-slider trajectory assembly, when the drive motor 213 drives the rotating rod 216 to rotate, the cross arm 218 can slide relative to the limiting transmission sleeve 219 in a limited position. At this time, several sliders 819 slide back and forth in the corresponding radial grooves 818, driving the transmission ring 813 to perform a circular motion trajectory on the screen plate plane.

[0032] Furthermore, a predetermined gap is provided between the bottom of the transmission ring 813 and the sieve plate mechanism, and the transmission ring 813 is provided with a cutter disc 816, an annular scraper 817 and a brush structure 815 from the inside to the outside, for shearing, scraping and cleaning the upper surface of the sieve plate unit.

[0033] By sequentially arranging a cutter disc 816, an annular scraper 817, and a brush structure 815 from the inside out on the transmission ring 813, all three components rotate synchronously with the rotating disc during the rotary sweeping process of the feed hopper structure, performing real-time shearing, scraping, and cleaning on the upper surface of the screen plate unit. Figure 8 As shown, the cutter disc 816 is located on the innermost side, which can crush the large fiber bundles or adhesive clumps accumulated in the central area of ​​the screen plate unit, cutting large impurities into small fragments for easy subsequent cleaning; the annular scraper 817 is located in the middle, which forcibly scrapes the residual material and the slurry layer attached to the screen surface away from the screen plate surface; the brush structure 815 is located on the outermost side, which cleans the screen plate surface and removes small particles or adhering substances that are difficult for the scraper to reach. Secondly, a predetermined gap is set between the bottom of the transmission ring 813 and the screen plate mechanism. On the one hand, the predetermined gap ensures the flow space and degree of the slurry falling in the barrel structure, and on the other hand, it ensures that the cutter disc 816, scraper and brush can effectively contact the upper surface of the screen plate unit to play a cleaning role, and avoids the rigid parts directly pressing the screen surface, causing screen deformation or excessive wear.

[0034] Example 4

[0035] In another embodiment of the present invention, the base 1112 is further provided with a locking claw mechanism corresponding to each sector slot position, and the bottom of the outer end of each screen plate unit is further provided with a locking block structure 6141 adapted to the locking claw mechanism. When the screen plate unit is assembled with the sector slot, the locking claw mechanism and the locking block structure 6141 act to achieve the locking assembly of the screen plate unit; each locking claw mechanism includes a locking seat 711 fixed on the base 1112, and the locking seat 711 includes sequentially opened The structure comprises an inner cavity 7112 and an outer cavity 7111. A transmission block 716 is slidably mounted within the outer cavity 7111. An arc groove 717 is formed on the lower surface of the transmission block 716. A swing rod 718 is mounted on the arc groove 717 via a pin, along with a torsion spring between the swing rod 718 and the pin. A locking pin 719 is provided at the end of the swing rod 718. A transmission lock is fixed to the top of the outer cavity 7111. The transmission lock includes a guide block 712 and a limiting block 713. 2. The transmission channel formed by the limiting block 713 can be used to lock or unlock the locking pin 719. The guide block 712 has an introduction slope 7121, a locking recess 7122, and an exit slope 7123 sequentially arranged along its outer contour. When the transmission block 716 moves towards the guide block 712, the locking pin 719 enters the locking recess 7122 along the introduction slope 7121, completing the locking action. When the transmission block 716 is pressed and pushed a second time, the locking pin 719, under the action of the torsion spring... The transmission block 7122 moves out of the transmission channel along the locking recess 7122 and the guide slope 7123 to unlock it; a bottom block 721 is provided at the inner end of the outer cavity 7111, and a connecting block 7161 is also provided on the back of the transmission block 716, as well as a second spring 715 provided between the guide block 712 and the connecting block 7161. A snap connector 720 is connected to the outer end of the transmission block 716 for matching with the lock block structure 6141. A handle 6142 is also provided at the outer end of the lock block structure 6141.

[0036] In this embodiment, a press-and-release locking block is further provided for locking and quick assembly and disassembly of the sieve plate unit; The locking gripper mechanism adopts a press-type push-spring structure design. By pressing the handle 6142 and pushing the transmission block 716, the locking or unlocking with the bottom locking block structure 6141 of the screen plate unit can be completed. Operators do not need to use any special tools. They can quickly assemble and disassemble the screen plate unit by simply pressing it manually, which greatly simplifies the maintenance process. It is especially suitable for scenarios where screen plates are frequently replaced or cleaned, and significantly shortens downtime for maintenance. Specifically, such as Figure 10 , 11As shown in Figure 12, the transmission lock includes a guide block 712 and a limiting block 713, which together form a dedicated transmission channel. The guide block 712 has an inlet ramp 7121, a locking recess 7122, and an outlet ramp 7123 arranged sequentially along its outer contour. When the transmission block 716 is pressed and pushed for the first time, the locking pin 719 at the end of the rocker arm 718 slides into the locking recess 7122 along the inlet ramp 7121 and completes the locking. When pressed for the second time, the locking pin 719 disengages along the locking recess 7122 under the action of the torsion spring's restoring force and moves out of the transmission channel along the outlet ramp 7123, thereby unlocking. During the locking operation, the transmission block 716 slides inward against the resistance of the second spring 715, and the spring stores energy. During the unlocking operation, the second spring 715 releases energy and pushes the transmission block 716 to automatically reset outward. In addition, the outer end of the transmission block 716 is connected to a snap-fit ​​connector 720. The snap-fit ​​connector 720 is adapted to the shape of the locking block structure 6141 at the bottom of the screen plate unit. In the locked state, the snap-fit ​​connector 720 and the locking block form a mechanical interlock, which firmly presses the screen plate unit into the positioning groove 821 of the fan-shaped slot, ensuring that the screen plate unit does not move during operation. By pressing the travel, operators can clearly perceive the locking and unlocking status by touch. Each sector slot position is equipped with an independent locking claw mechanism, so that the locking and unlocking of each screen plate unit is independent and does not interfere with each other. When a screen plate unit needs to be replaced or cleaned, only the locking claw mechanism at the corresponding position needs to be operated to disassemble and install the unit individually, without touching other screen plate units, which provides high maintenance flexibility.

[0037] Example 5

[0038] In another embodiment of the present invention, the slider body 819 is provided with side wing protrusions 8191 on both sides. The two side wing protrusions 8191 pass through the through slot 8192 on the fan-shaped slot and extend to the edge of the second screen plate 612 to interact with it. When the slider body 819 moves back and forth in 817, under the wave-shaped structure of the second screen plate 612, the side wing protrusions 8191 on both sides interact with the edge of the second screen plate 612 to generate dynamic vibration.

[0039] like Figure 14As shown, based on Example 3, the reciprocating motion of the slider 819 is converted into screen plate vibration. Specifically, side wing protrusions 8191 are laterally arranged on both sides of the slider 819. The two side wing protrusions 8191 penetrate the lateral through grooves 8192 on the side wall of the fan-shaped slot and extend to the edge of the second screen plate 612, where they abut against each other. When the slider 819 reciprocates within 817, the side wing protrusions 8191 move synchronously with the slider 819, continuously colliding and squeezing with the wave-shaped edge of the second screen plate 612, forcing the screen plate unit to generate high-frequency micro-amplitude vibration. This vibration energy can effectively destroy the bridging phenomenon and adhesion layer of fibers in the pulp on the screen surface, causing the fine fibers or impurities clogging the screen holes to loosen and fall off under the action of vibration, reducing the risk of screen clogging. The second screen plate 612 adopts a wave-shaped structure, with its edge having an undulating wave profile in the radial direction. When the side wing protrusions 8191 slide back and forth along the slider in the radial direction, the contact point between the side wing protrusions 8191 and the edge of the wave changes continuously, generating a changing force at the alternation of the wave crests and troughs, causing the screen plate to vibrate. When the equipment running speed increases, the reciprocating frequency of 817 increases. When processing slurries with higher viscosity that require stronger vibration, it is only necessary to increase the speed of the drive motor 213 to simultaneously enhance the vibration effect.

[0040] Example 6

[0041] As another embodiment of the present invention, a screening method is provided, comprising the following steps according to the aforementioned sieve plate apparatus for papermaking: S1: Insert multiple screen plate units into the positioning slots 821 of the corresponding sector slots, and lock them in place through the cooperation of the locking claw mechanism and the locking block structure 6141 to complete the assembly of the entire screen plate body. S2: The pulp to be screened is fed into the feed inlet 311. The pulp passes through the feed column 312 and the feed bin 811 in sequence and enters the screening chamber formed by the feed barrel structure, the screen plate mechanism and the barrel structure. S3: Start the drive motor 213, drive the transmission bracket and the feeding barrel structure to rotate around the axis, so that the slider body 819 of the multi-slider trajectory assembly makes a covering circumferential displacement along the circular frame under the constraint of the groove 818, and drive the feeding barrel structure to alternately cover the top of different screen plate units to perform pulp screening operation. S4: The slurry after screening enters the lower part of the tank 112 through the sieve plate mechanism, and after being filtered again by the screen layer 1121, it is discharged from the first discharge pipe 113 and the second discharge pipe 114 respectively.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. There are various ways to install detachably, such as by using a combination of plug-in and snap-fit, or by using bolt connections, etc.

[0043] The above embodiments, which describe the specific features of the present invention, are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the invention shall fall within the scope of protection of the present invention.

Claims

1. A sieve plate device for papermaking, characterized in that, include: Frame; The barrel structure is fixedly connected to the bottom side of the frame; A sieve plate mechanism is installed at the top opening of the barrel structure. The sieve plate mechanism includes a circular frame and several grooves that are radially opened from the center to the periphery on the circular frame. The sector between two adjacent grooves forms a sector-shaped slot. The inside of the sector-shaped slot is provided with a positioning groove. Several sieve plate units are detachably inserted into the positioning slots of the corresponding fan-shaped slots to form the entire sieve plate body; The feed hopper structure is located above the screen plate mechanism; A multi-slider trajectory assembly is disposed between the feed hopper structure and the groove, with its bottom sliding limit located within the groove; a bracket rotation mechanism is installed on the frame and its power output end is connected to the feed hopper structure; When the support rotation mechanism drives the feed hopper structure to rotate around the axis, the multi-slider trajectory component is constrained by the groove and makes a covering circumferential displacement along the circular frame, taking turns covering the different screen plate units to perform pulp screening.

2. The sieve plate device for papermaking according to claim 1, characterized in that: The barrel structure includes a tank and a screen layer disposed in the lower part of the tank. The side wall and bottom of the tank below the screen layer are respectively connected to a first discharge pipe and a second discharge pipe. The circular frame includes a base, which is fixedly assembled on the top of the tank, and a plate frame disposed on the base. The grooves are uniformly arranged in a circular array with the axis of the plate frame as the center, and each groove extends through from the axis to the outer periphery of the circular frame. Each groove can serve as a receiving groove for receiving and guiding the separated pulp overflowing from the edge of the screen plate unit during the screening operation.

3. A sieve plate device for papermaking according to claim 1, characterized in that: Each screen plate unit includes an end block, the front end of which is connected to a screen plate interlayer module for multi-layer screening of pulp. The screen plate interlayer module is fan-shaped and matches a fan-shaped slot. The end block is also provided with a collection bin assembly that docks with the end of the groove. The collection bin assembly includes a collection bin, an extension block is fixed to the side wall of the collection bin, a sliding block is slidably installed on the extension block, and an end plate is fixed to the end of the extension block. A first spring is connected between the end plate and the sliding block, and the sliding block is fixed to the side wall of the end block. When the screen plate unit is assembled with the positioning groove, the collection bin docks with the opening end of the groove under the connecting action of the sliding block, the first spring, and the end plate to receive and collect the screen residue.

4. A sieve plate device for papermaking according to claim 3, characterized in that: The sieve plate sandwich module includes a first sieve plate, a second sieve plate, and a third sieve plate arranged sequentially from top to bottom. The first sieve plate, the second sieve plate, and the third sieve plate are all connected to the same end of the end block, and the other end is in an open state. The overall height of the sieve plate sandwich module increases gradually from the center outwards in a radial manner. The second sieve plate is wavy, and the first sieve plate is located at the top and has a ridge-shaped structure that is raised in the middle and gradually thins on both sides.

5. A sieve plate device for papermaking according to claim 1, characterized in that: The multi-slider trajectory assembly includes a transmission ring, with several slider units arranged circumferentially on the transmission ring. Each slider unit has a slider body confined within the groove, and the slider body is rotatably mounted on the transmission ring via a rotating shaft. Each slider unit is subjected to a combined action of the linear limiting effect of the groove and the rotational drive of the feed barrel structure, causing a preset moving point on it to trace a motion trajectory, thereby realizing a covering sweeping action of the feed barrel structure on the screen plate unit. The feed barrel structure includes a feed bin and a connecting cylinder connected sequentially from top to bottom, with the connecting cylinder connected to the top of the transmission ring.

6. A sieve plate device for papermaking according to claim 1, characterized in that: The frame includes a base frame and a support frame integrally welded to the base frame. The barrel structure is mounted on the base frame. The top of the support frame is equipped with a feed inlet and a feed column connected and communicating with the bottom of the feed inlet. The bottom end of the feed column extends downward into the feed barrel structure. The support rotation mechanism includes a transmission bracket rotatably mounted on the feed column and a belt drive mechanism mounted on the support frame. The belt drive mechanism includes a drive motor, which is fixedly mounted on the support frame via a connecting frame. The output shaft of the feed column is connected to a drive pulley and a driven pulley mounted on the feed column and connected to the transmission bracket. A transmission belt drives between the driven pulley and the drive pulley. The transmission bracket includes a rotating rod that rotates around the feed column as an axis. The outer end of the rotating rod is vertically connected to an upper cantilever and a limiting transmission sleeve connected to the bottom of the upper cantilever. A limiting sliding cross arm is laterally connected to the limiting transmission sleeve, and the inner end of the cross arm is fixedly connected to the side wall of the connecting barrel.

7. A sieve plate device for papermaking according to claim 5, characterized in that: A predetermined gap is provided between the bottom of the transmission ring and the sieve plate mechanism, and the transmission ring is provided with a cutter disc, an annular scraper and a brush body structure from the inside to the outside, for shearing, scraping and cleaning the upper surface of the sieve plate unit.

8. A sieve plate device for papermaking according to claim 2, characterized in that: The base is also provided with a locking claw mechanism for each sector slot, and each screen plate unit is also provided with a locking block structure adapted to the locking claw mechanism at the bottom of its outer end. When the screen plate unit is assembled with the sector slot, the locking claw mechanism and the locking block structure work together to achieve the locking assembly of the screen plate unit. Each of the aforementioned locking claw mechanisms includes a locking seat fixed on a base. The locking seat includes an inner cavity and an outer cavity sequentially formed. A transmission block is slidably installed in the outer cavity. An arc groove is formed on the lower surface of the transmission block. A swingable lever is mounted on the arc groove via a pin, and a torsion spring is provided between the lever and the pin. A locking pin is provided at the end of the lever, and a transmission locking component is fixed on the top of the outer cavity. The transmission locking component includes a guide block and a limiting block. The transmission channel formed by the guide block and the limiting block can be used to lock or unlock the locking pin. The guide block has an inlet ramp, a locking recess, and an outlet ramp sequentially formed along its outer contour. When the transmission block moves towards the guide block, the locking pin enters the locking recess along the inlet ramp, completing the locking action. When the transmission block is pressed and pushed a second time, the locking pin moves out of the transmission channel along the locking recess and the outlet ramp under the action of the torsion spring, realizing its unlocking. The inner end of the outer cavity is provided with a bottom block, and the back of the transmission block is also provided with a connecting block, as well as a second spring provided between the guide block and the connecting block. The outer end of the transmission block is connected with a snap connector for fitting with the locking block structure. The outer end of the locking block structure is also provided with a handle.

9. A sieve plate device for papermaking according to claim 5, characterized in that: The slider body has two lateral wing protrusions on both sides. The two lateral wing protrusions pass through the through slot on the fan-shaped slot and extend to the edge of the second screen plate to interact with it. When the slider body moves back and forth inside, under the wave-shaped structure of the second screen plate, the lateral wing protrusions on both sides interact with the edge of the second screen plate to generate dynamic vibration.

10. A screening method, comprising a sieve plate device for papermaking according to any one of claims 1-9, characterized in that: Includes the following steps: S1: Insert multiple screen plate units into the positioning slots of the corresponding sector slots, and lock them in place through the cooperation of the locking claw mechanism and the locking block structure to complete the assembly of the entire screen plate body; S2: The pulp to be screened is fed into the feed inlet, and the pulp passes through the feed column and feed bin in sequence into the screening chamber formed by the feed barrel structure, screen plate mechanism and barrel structure. S3: Start the drive motor to drive the transmission bracket and the feeding barrel structure to rotate around the axis, so that the slider of the multi-slider trajectory assembly makes a covering circumferential displacement along the circular frame under the constraint of the groove, and drives the feeding barrel structure to alternately cover the top of different screen plate units to perform pulp screening operation. S4: The slurry after screening enters the lower part of the tank through the sieve plate mechanism, and after being filtered again by the screen layer, it is discharged from the first discharge pipe and the second discharge pipe respectively.

Images