A multi-disc vacuum filter for pulp recovery

Abstract

The application belongs to the technical field of multi-disc vacuum filter, and discloses a multi-disc vacuum filter for paper pulp recovery, which comprises a multi-disc vacuum filter body, a plurality of filter discs are arranged on the multi-disc vacuum filter body, a plurality of scrapers are fixedly connected to the inner wall of the body of the multi-disc vacuum filter body, and every two adjacent scrapers are in a symmetrical state; the reciprocating screw rod one is driven to rotate by the motor and gear chain transmission mechanism, the double-end bevel knife plate is driven to reciprocate along the scraper, the hardened filter cake dirt accumulated in the gap between the scraper and the filter disc can be continuously removed, the accumulated dirt is avoided to reduce the fitting gap, the binding force between the filter cake dirt and the scraper is broken by impact, the stubborn clumps are loosened and cracked, the reciprocating screw rod two is driven to rotate by gear two synchronous belt, and the transmission components such as the arc-shaped sliding groove, the sliding bead and the connecting rod are matched to drive the rotating rod and the plurality of groups of alternating double-end knife plates to reciprocate, so that the falling large filter cake is cut and broken.

Description

Technical Field

[0001] This invention belongs to the technical field of multi-disc vacuum filters, specifically a multi-disc vacuum filter for pulp recycling. Background Technology

[0002] Multi-disc vacuum filters are core solid-liquid separation equipment for white water fiber recovery and low-concentration pulp concentration in the pulp and paper industry. They rely on vacuum suction to achieve fiber / filler recovery and water resource recycling, and feature high efficiency, energy saving, and high degree of automation. The core structure consists of seven core components: tank, filter discs, main shaft, distribution valve, pulp stripping / washing device, transmission system, and water leg vacuum system. Among them, the filter discs, which are the core working parts, are composed of 6-20 filter discs, with a single disc φ2500-5200mm. Each disc is divided into 12-24 fan-shaped filter plates (covered with filter cloth), and the filtration area of ​​a single disc is 7.5-38㎡.

[0003] Currently, in the process of pulp recycling using a multi-disc vacuum filter, after the filter discs are immersed in pulp, fibers and fillers continuously accumulate. After dewatering, they are compacted into fiber filter cakes, which are sheet-like blocks that adhere to the surface of the filter cloth. As the filter discs rotate out of the liquid surface, they continue to be dewatered under vacuum, reducing the moisture content of the filter cakes and causing them to solidify. The filter cakes are then passively rotated and come into contact with the opening of the collection trough plate on the machine. This allows the filter cake material to be scraped off. However, due to prolonged contact between the opening of the collection trough plate and the filter discs, the filter cakes accumulate and adhere to the scraper plate at the top of the collection trough plate. The accumulated material continues to thicken, and in severe cases, the filter cakes may rub against and squeeze the disc surface and filter cloth during rotation, easily causing the filter cloth to fray, break, and loosen. It may also increase the load on the main shaft drive and increase the cost of later cleaning and maintenance. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a multi-disc vacuum filter for pulp recycling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-disc vacuum filter for pulp recycling, comprising a multi-disc vacuum filter body, wherein multiple filter discs are installed on the multi-disc vacuum filter body, and multiple scrapers are fixedly connected to the inner wall of the multi-disc vacuum filter body, wherein every two adjacent scrapers are symmetrical, and each scraper is provided with a rotating flat scraping structure for removing the filter cake material accumulated on the scraper, and the rotating flat scraping structure is also provided with a rotating reciprocating structure; The rotary flat scraper structure includes multiple rectangular groove plates. Each rectangular groove plate has a groove, and a double-headed inclined blade is slidably connected to the inner wall of each groove. Each double-headed inclined blade can be slidably connected to the corresponding scraper. A folding curtain is fixedly connected to the groove wall of each groove to maintain the sealing of the rectangular groove plate. The rotary reciprocating structure includes multiple sets of double-headed blades. Each set of double-headed blades is connected to a rotating rod, and each set of double-headed blades is in four alternating tilted states, used to passively crush large pieces of filter cake that fall.

[0006] Preferably, the rotary flat scraper structure further includes a motor as a power source, a gear is fixedly connected to the output shaft of the motor, an external toothed chain is meshed on the gear, a cover plate is fixedly connected to the body of the multi-disc vacuum filter body, the body of the motor and the outer wall of the cover plate are fixedly connected, and the output shaft of the motor is rotatably connected to a panel body near the cover plate.

[0007] Preferably, the external toothed chain is meshed with a second gear, and multiple second gears are arranged horizontally on one side of the multi-disc vacuum filter body where the motor is located. The external toothed chain is connected in series with multiple second gears through staggered transmission. Each rectangular slot plate has a reciprocating screw connected to its inner wall. One end of each reciprocating screw protruding from the outer wall of the rectangular slot plate is fixedly connected to the adjacent second gear. The side of the cover plate away from the motor is movably sleeved with the rod of each reciprocating screw. The side of each rectangular slot plate near the motor is fixedly connected to the cover plate. One end of each double-headed inclined blade located inside the rectangular slot plate is slidably connected to the reciprocating screw through a ball screw sleeve. Each of the rectangular slot plates is provided with several impact vibration structures to provide vibration points for each corresponding double-headed inclined blade.

[0008] Preferably, each of the striking vibration structures includes a T-shaped plate, and striking balls are fixedly connected to both sides of the T-shaped plate. The two striking balls can intermittently make contact with the two sides of the double-headed beveled blade plate. A shaft is fixedly connected to the center of the T-shaped plate, and torsion springs are fixedly connected to the outer wall of the shaft near both ends. The two torsion springs deform and twist in opposite directions under the same force.

[0009] Preferably, cylindrical grooves are formed in both sides of the inner surface of the rectangular groove plate, and the other ends of the two torsion springs away from the T-shaped plate are fixedly connected to the groove walls of the two cylindrical grooves respectively. The two ends of the shaft are rotatably connected to the inner walls of the rectangular groove plate with the two cylindrical grooves respectively.

[0010] Preferably, each of the rotary reciprocating structures further includes a reciprocating lead screw two fixedly connected to the gear two. The reciprocating lead screw two is rotatably connected to one end of the cover plate away from the rectangular slot plate. The reciprocating lead screw two is slidably connected to a collar one via ball bearings. A collar two is provided diagonally above the collar one. A connecting rod is fixedly connected between the collar one and the collar two.

[0011] Preferably, a cylindrical rod is slidably connected inside the second collar, and an arc-shaped groove is formed on the outer wall of the cylindrical rod. A sliding ball is slidably connected in the groove wall of the arc-shaped groove, and the sliding ball is movably sleeved with the inner wall of the second collar.

[0012] Preferably, one end of the cylindrical rod is fixedly connected to the rotating rod, and a Y-shaped plate is rotatably connected to the rod body. The bottom end of the Y-shaped plate is fixedly connected to the top outer wall of the rectangular groove plate.

[0013] Preferably, the plates near the bottom of each of the four double-headed blades are fixedly mounted to each corresponding rotating rod. The rotating rod is rotatably connected to the top plate of the Y-shaped plate. The top plate of the Y-shaped plate is provided with a blade groove that can accommodate the double-headed blade plates to rotate in close contact.

[0014] Preferably, the double-headed inclined blades near the first and last ends of the multi-disc vacuum filter body are single blades, while each of the other double-headed inclined blades located between the two filter discs is a bidirectional blade.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention drives a reciprocating screw through a motor and gear chain transmission mechanism, which in turn drives a double-headed inclined blade to scrape back and forth along the scraper. This continuously removes hardened filter cake scale accumulated on the scraper surface and in the gap between the scraper and the filter disc, preventing scale buildup from reducing the clearance and causing the scraper to jam or its movement to be obstructed. This ensures that the filter disc unloads and filters continuously and stably. This invention utilizes a striking vibration structure triggered by the translational movement of a double-headed inclined blade plate. The intermittent impact of the striking ball against the blade plate generates high-frequency vibration, which breaks down the bond between the filter cake and the scraper, causing stubborn clumps to loosen and crack, significantly improving the removal efficiency of hard deposits. At the same time, the vibration prevents fibrous materials from adhering to the surface of the double-headed inclined blade plate, maintaining the cleanliness and scraping ability of the blade plate. For filter discs in different locations, single-blade and bi-directional blade plate structures are differentiated to adapt to the cleaning needs of different areas, resulting in more comprehensive cleaning coverage. This invention uses a gear two to synchronously drive a reciprocating lead screw two, which, in conjunction with arc-shaped sliding grooves, ball bearings, connecting rods, and other transmission components, drives a rotating rod and multiple sets of alternating tilting double-headed blades to reciprocate and oscillate, cutting and crushing large pieces of filter cake as they fall. On the one hand, this prevents large pieces of filter cake from bridging and clogging the discharge port in the collection trough, ensuring continuous material transport. On the other hand, the improved flowability of the crushed material reduces the operating load of the pulp pump and conveying equipment, minimizing malfunctions and energy consumption. Furthermore, the finely crushed filter cake material is more suitable for subsequent pulp recycling and reprocessing processes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall front planar structure of the present invention; Figure 3 This is a partial cross-sectional view of the rectangular groove plate of the present invention; Figure 4 For the present invention Figure 3 A magnified view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the Y-shaped plate structure of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the rectangular groove plate and the Y-shaped plate of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point B in the middle; Figure 8 This is a schematic diagram of the split structure of the slip ball and collar of the present invention; Figure 9 This is a schematic diagram of the overall structure of the sliding ball of the present invention; Figure 10 This is a partial structural diagram of the rotary flat scraper structure of the present invention.

[0017] In the picture: 1. Multi-disc vacuum filter body; 101. Filter disc; 102. Scraper; 2. Motor; 201. Gear 1; 202. External gear chain; 203. Cover plate; 204. Gear 2; 205. Reciprocating screw 1; 206. Rectangular groove plate; 207. Double-headed inclined blade plate; 208. Folding curtain; 209. T-shaped plate; 210. Striking ball; 211. Shaft; 212. Torsion spring; 2121. Cylindrical groove; 213. Reciprocating screw 2; 214. Collar 1; 2141. Collar 2; 2142. Connecting rod; 215. Cylindrical rod; 216. Arc-shaped slide groove; 217. Sliding ball; 218. Rotating rod; 219. Y-shaped plate; 220. Double-headed blade plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1 to 10 As shown, the present invention provides a multi-disc vacuum filter for pulp recycling, including a multi-disc vacuum filter body 1, on which multiple filter discs 101 are installed, and multiple scrapers 102 are fixedly connected to the inner wall of the multi-disc vacuum filter body 1. Each pair of adjacent scrapers 102 are symmetrical, thereby feeding and guiding the filter cake attached to the two discs of the filter discs 101 that are respectively arranged between adjacent scrapers 102. The above are all prior art, and will not be described in detail here.

[0020] Each scraper 102 of the multi-disc vacuum filter body 1 is equipped with a rotating flat scraping structure for removing filter cake material accumulated on the scraper 102. The rotating flat scraping structure includes multiple rectangular grooves 206, which are located between two adjacent scrapers 102. Each rectangular groove 206 has a through groove, and a double-headed inclined blade 207 is slidably connected to the inner wall of each through groove. The double-headed inclined blade 207 is set through the through groove of the rectangular groove 206. Each blade 207 is equipped with two blades, which can contact two adjacent and corresponding scrapers 102. Folding curtains 208 are fixedly connected to both sides of the through groove. Two folding curtains 208 are provided on one side of the through groove. One end of each folding curtain 208 is fixedly connected to both ends of the through groove, and the other end is fixedly connected to the side of the double-headed inclined blade 207 located in the through groove. The folding curtains 208 maintain the sealing of the rectangular groove plate 206. (See reference for details.) Figure 8 The structure in.

[0021] The rotary flat scraper structure also includes a motor 2 as a power source. A gear 201 is fixedly connected to the output shaft of the motor 2. An external toothed chain 202 is meshed with the gear 201. A cover plate 203 is fixedly connected to the body of the multi-disc vacuum filter 1. The body of the motor 2 and the outer wall of the cover plate 203 are fixedly connected. The output shaft of the motor 2 is rotatably connected to a panel near the cover plate 203. A gear 204 meshes with the external toothed chain 202. Multiple gears 204 are arranged horizontally on one side of the multi-disc vacuum filter 1 where the motor 2 is located. The gears 204 have a double-layer gear structure, and the multiple gears 204 are arranged in a matrix-like staggered pattern horizontally. There are multiple external toothed chains 202, arranged in a crisscross pattern. Except for the gear 204 at the very end, the gears 204 in the middle positions can mesh with one side of each of the two external toothed chains 202. The specific structure is as follows: Figure 10 As shown, based on this structure, the external toothed chain 202 that meshes with gear 1 201 drives all gears 204 in series through an interleaved transmission method.

[0022] Each rectangular slot plate 206 has a reciprocating screw 205 rotatably connected to its inner wall. One end of each reciprocating screw 205 protruding from the outer wall of the rectangular slot plate 206 is fixedly connected to a nearby gear 204. The side panel of the cover plate 203 away from the motor 2 is movably sleeved with the rod of each reciprocating screw 205. The side panel of each rectangular slot plate 206 near the motor 2 is fixedly connected to the cover plate 203. The middle part of each double-headed inclined blade 207 located inside the rectangular slot plate 206 is slidably connected to the reciprocating screw 205 through a ball screw sleeve. It should be noted that the ball screw sleeve is an existing structure. The reciprocating structure of the reciprocating screw 205 can drive the ball screw sleeve on its outer surface to move back and forth.

[0023] The above solution is adopted: such as Figure 1 and Figure 2 As shown, the multi-disc vacuum filter body 1 relies on vacuum negative pressure and passive rotating filter disc 101, combined with zoned operation, to continuously complete solid-liquid separation, fiber concentration and recovery of low-concentration pulp / white water. The entire process runs continuously in a cycle to achieve the purpose of pulp recovery. The specific operating principle of the multi-disc vacuum filter body 1 is existing technology and will not be elaborated on here.

[0024] The filter cloth on multiple filter discs 101 traps fibers and dehydrates them under vacuum, forming a filter cake (specifically, a solid cake containing a certain amount of moisture) on the filter cloth of the filter discs 101. As the filter discs 101 rotate passively and slowly, the filter cake attached to the filter discs 101 is separated from the filter discs 101 by gravity and contact with the scraper 102. The separated filter cakes fall naturally and collect in the collection trough in the body 1 of the multi-disc vacuum filter. During this process, the falling filter cakes of varying sizes pass over the scraper 102 (mostly large pieces). With prolonged use, filter cake material will accumulate on the scraper 102, and the accumulated material will continue to thicken, narrowing the gap between the trough and the filter discs 101. During rotation, the material scrapes and squeezes the disc surface and filter cloth, easily causing the filter cloth to fray, break, and loosen.

[0025] Based on the aforementioned potential problems, this solution is as follows: Figure 3 , Figure 4 , Figure 6 and Figure 10 As shown, by starting the motor 2, its output shaft drives the gear 201 to rotate. The rotating gear 201 will mesh with and drive an external toothed chain 202 to rotate. This passively rotating external toothed chain 202 drives all the gears 204 simultaneously through the interleaved transmission chain and sprocket structure. In turn, the passively rotating gears 204 will drive the reciprocating screw 205 to rotate at a fixed point on the cover plate 203. Thus, the double-headed inclined blade 207, which is slidably connected to the reciprocating screw 205 through the ball screw sleeve, will reciprocate within the rectangular groove plate 206. In the passive translation state, the double-headed inclined blade 207 will stretch and compress the folding curtains 208 installed at both ends in real time within the rectangular groove plate 206. By setting the folding curtain 208, the rectangular trough plate 206 is kept in a sealed state during the process of cleaning the filter cake material remaining on the scraper plate 102 by the reciprocating translation of the double-headed inclined blade 207, thus preventing the material from entering the rectangular trough plate 206. This solves the problem of material scaling and accumulation between the scraper plate 102 and the filter plate 101.

[0026] Each rectangular slot plate 206 contains several impact vibration structures to provide vibration points for each corresponding double-headed inclined blade plate 207. Each impact vibration structure includes a T-shaped plate 209, with impact balls 210 fixedly connected to both sides of the T-shaped plate 209. The balls of the two impact balls 210 can intermittently contact the two sides of the double-headed inclined blade plate 207. A shaft 211 is fixedly connected to the center of the T-shaped plate 209. Torsion springs 212 are fixedly connected to the outer wall of the shaft 211 near both ends. The two torsion springs 212 deform and twist in opposite directions under the same force. Cylindrical grooves 2121 are formed in both sides of the inner surface of the rectangular slot plate 206. The other ends of the two torsion springs 212 away from the T-shaped plate 209 are fixedly connected to the groove walls of the two cylindrical grooves 2121 respectively. The two ends of the shaft 211 are rotatably connected to the inner walls of the rectangular slot plate 206 with the two cylindrical grooves 2121 respectively.

[0027] It should be noted that the double-headed inclined blades 207 near the beginning and end of the multi-disc vacuum filter body 1 are single blades, because they only need to clean the scrapers 102 on the outside of the filter discs 101 at the beginning and end. The other double-headed inclined blades 207 located between the two filter discs 101 are bidirectional blades, used to clean the scrapers 102 between each pair of filter discs 101.

[0028] The above solution is adopted: such as Figure 6 and Figure 7 As shown, in the passive translation state, the double-headed inclined blade 207 will come into contact with the body of the T-shaped plate 209. Under the translational pushing force of the double-headed inclined blade 207, the T-shaped plate 209 and the shaft 211 will directly rotate at a fixed point at the location of the two cylindrical grooves 2121. As a result, the T-shaped plate 209 will passively rotate 90 degrees. During the rotation, the torsion spring 212, which is fixedly mounted between one side of the shaft 211 and the cylindrical groove 2121, will deform and press against the shaft 211, and the generated torsional force will gradually decrease. At the same time, the other torsion spring 212 will do the opposite. The diameter of the torsion spring 212 will deform and the generated torsional force will gradually increase. However, at this time, due to the contact and pushing of the T-shaped plate 209 by the double-headed inclined blade 207, the torsion spring 212 will enter a state similar to storing force. The moment the double-headed beveled blade 207 separates from the T-shaped plate 209, the torsion spring 212, which is in a state of stored energy, is released from its restraint, causing the T-shaped plate 209 to rotate rapidly in the opposite direction, thereby causing the striking ball 210 to hit the double-headed beveled blade 207 and causing the double-headed beveled blade 207 to vibrate.

[0029] The two torsion springs 212 are designed to enable the double-headed inclined blade 207 to perform a charged strike when moving in opposite directions. When moving in opposite directions, the T-shaped plate 209 rotates 90 degrees synchronously, causing the striking ball 210 to strike the double-headed inclined blade 207 with gravity, providing a vibration point and causing it to vibrate and translate passively on the scraper 102. This vibration generates high-frequency micro-impacts between the double-headed inclined blade 207, the filter cake, and the scraper 102, disrupting the bond between the filter cake and the scraper 102, causing cracks and loosening of the hardened material. This makes it easier to scrape off previously firmly adhered scale, preventing scale buildup from the double-headed inclined blade 207 during cleaning and scraping, and preventing scale formation from the fallen filter cake.

[0030] The rotary flat scraper structure is also equipped with a rotary reciprocating structure, which includes multiple sets of double-headed blades 220. Each set of double-headed blades 220 has a rotating rod 218 fixedly connected to its bottom end, and each set of double-headed blades 220 is in four alternating tilted states, used to passively crush large pieces of filter cake that fall. Each rotary reciprocating structure also includes a reciprocating lead screw 213 fixedly connected to gear 204. The reciprocating lead screw 213 is rotatably connected to one end of the cover plate 203 away from the rectangular slot plate 206. The reciprocating lead screw 213 is slidably connected to a collar 214 via ball bearings. A collar 2141 is provided diagonally above the collar 214. A connecting rod 2142 is fixedly connected between the collar 214 and the collar 2141. A cylindrical rod 215 is slidably connected inside the collar 2141. An arc-shaped groove 216 is opened on the outer wall of the cylindrical rod 215. A ball bearing 217 is slidably connected in the groove wall of the arc-shaped groove 216. The ball bearing 217 is movably sleeved with the inner wall of the collar 2141. One end of the cylindrical rod 215 is fixedly connected to the rotating rod 218. A Y-shaped plate 219 is rotatably connected to the rod body of the rotating rod 218. The bottom plate of the Y-shaped plate 219 is fixedly connected to the top outer wall of the rectangular groove plate 206. The plates of every four double-headed blades 220 near the bottom are fixedly mounted to each corresponding rotating rod 218. The rotating rod 218 and the top plate of the Y-shaped plate 219 are rotatably connected. The top plate of the Y-shaped plate 219 has a groove that can accommodate the double-headed blades 220 to fit and rotate.

[0031] The above solution is adopted: such as Figure 8 and Figure 9As shown, the rotating gear 204 can also synchronously drive the reciprocating screw 213 to rotate. Since the collar 213 on the reciprocating screw 213 is fixedly connected to the collar 2141 via the connecting rod 2142, the rotating reciprocating screw 213 will drive the collar 214, the collar 2141, and the connecting rod 2142 to reciprocate synchronously. The sliding ball 217, which is fitted onto the inner wall of the second collar 2141, only rotates at the connection point of the second collar 2141 and does not move freely within the inner wall of the second collar 2141. Therefore, the driven second collar 2141 will slide guided by the sliding ball 217 through the arc-shaped groove 216 on the cylindrical rod 215 during translation. This causes the cylindrical rod 215 to passively reciprocate with a small amplitude. The rotating cylindrical rod 215 will simultaneously drive the rotating rod 218 to rotate at a fixed point within the Y-shaped plate 219, thereby causing the multiple double-headed blades 220 crosswise mounted on each rotating rod 218 to reciprocate. Due to the overall shape limitation of the arc-shaped groove 216, the rotating rod 218 will only rotate within a limited amplitude, rather than rotating one full revolution. The passively swinging double-headed blade 220, which is fixed on the rotating rod 218, can crush large pieces of filter cake that fall, prevent large pieces of material from accumulating and bridging, prevent the discharge port of the collection trough from being blocked, maintain stable material level, greatly improve subsequent flowability, and ensure continuous conveying of slurry. In addition, the cross-shaped double-headed blade 220 can increase the cutting and crushing area of ​​the filter cake, avoiding insufficient contact area that would prevent it from being crushed.

[0032] It is worth noting that the continuous passive rotation of gear 204 in the same direction will synchronously drive reciprocating screw 205 and reciprocating screw 213 to rotate in one direction, thereby driving the double-headed inclined blade 207 and collar 214 connected to them to perform forward, reverse, retract and reset, and forward reciprocating motions respectively. The motion of reciprocating screw 213 driven by collar 214 can indirectly cause the cylindrical rod 215, rotating rod 218 and double-headed blade 220 to rotate reciprocally.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-disc vacuum filter for pulp recycling, comprising a multi-disc vacuum filter body (1), characterized in that: The multi-disc vacuum filter body (1) is provided with multiple filter discs (101), and multiple scrapers (102) are fixedly connected in the inner wall of the multi-disc vacuum filter body (1). Each pair of adjacent scrapers (102) are symmetrical. Each scraper (102) is provided with a rotating flat scraping structure, and the rotating flat scraping structure is also provided with a rotating reciprocating structure. The rotating flat scraper structure includes multiple rectangular groove plates (206). Each rectangular groove plate (206) has a groove on its plate body, and a double-headed inclined blade (207) is slidably connected to the inner wall of each groove. Each double-headed inclined blade (207) can be slidably connected to the corresponding scraper (102). A folding curtain (208) is fixedly connected to the groove wall of each groove. The rotary reciprocating structure includes multiple sets of double-headed blades (220), each set of double-headed blades (220) is fixedly connected to a rotating rod (218), and each set of double-headed blades (220) is in four alternating tilted states, used to passively crush large pieces of filter cake that fall.

2. The multi-disc vacuum filter for pulp recycling according to claim 1, characterized in that: The rotating flat scraper structure also includes a motor (2) as a power source. A gear (201) is fixedly connected to the output shaft of the motor (2). An external toothed chain (202) is meshed on the gear (201). A cover plate (203) is fixedly connected to the body of the multi-disc vacuum filter body (1). The body of the motor (2) and the outer wall of the cover plate (203) are fixedly connected. The output shaft of the motor (2) is rotatably connected to a panel body near the cover plate (203).

3. The multi-disc vacuum filter for pulp recycling according to claim 2, characterized in that: The external toothed chain (202) is meshed with gear two (204). Multiple gear two (204) are arranged horizontally on one side of the multi-disc vacuum filter body (1) where the motor (2) is located. The external toothed chain (202) is connected in series with multiple gear two (204) through interleaved transmission. Each rectangular slot plate (206) is rotatably connected to a reciprocating screw one (205) on its inner wall. Each reciprocating screw one (205) protrudes from the outer wall of the rectangular slot plate (206). One end of each is fixedly connected to the adjacent gear two (204), the cover plate (203) away from the motor (2) is movably sleeved with the rod body of each reciprocating screw one (205), the end of each rectangular slot plate (206) close to the motor (2) is fixedly connected to the cover plate (203), and the end of each double-headed inclined blade (207) located inside the rectangular slot plate (206) is slidably connected to the reciprocating screw one (205) through a ball screw sleeve; Each of the rectangular slot plates (206) is provided with several impact vibration structures to provide vibration points for each of the corresponding double-headed inclined blade plates (207).

4. The multi-disc vacuum filter for pulp recycling according to claim 3, characterized in that: Each of the aforementioned striking vibration structures includes a T-shaped plate (209), on which striking balls (210) are fixedly connected. The two striking balls (210) can intermittently make contact with the two plates of the double-headed beveled blade (207). A shaft (211) is fixedly connected to the center of the T-shaped plate (209), and torsion springs (212) are fixedly connected to the outer wall of the shaft (211) near both ends.

5. The multi-disc vacuum filter for pulp recycling according to claim 4, characterized in that: Cylindrical grooves (2121) are provided in both sides of the inner surface of the rectangular groove plate (206). The other ends of the two torsion springs (212) away from the T-shaped plate (209) are fixedly connected to the groove walls of the two cylindrical grooves (2121). The two ends of the shaft (211) are rotatably connected to the inner walls of the rectangular groove plate (206) with the two cylindrical grooves (2121).

6. The multi-disc vacuum filter for pulp recycling according to claim 5, characterized in that: Each of the aforementioned rotary reciprocating structures also includes a reciprocating screw two (213) fixedly connected to gear two (204). The reciprocating screw two (213) is rotatably connected to one end of the cover plate (203) away from the rectangular slot plate (206). The reciprocating screw two (213) is slidably connected to a collar one (214) via ball bearings. A collar two (2141) is provided diagonally above the collar one (214). A connecting rod (2142) is fixedly connected between the collar one (214) and the collar two (2141).

7. The multi-disc vacuum filter for pulp recycling according to claim 6, characterized in that: A cylindrical rod (215) is slidably connected inside the second collar (2141). An arc-shaped groove (216) is provided on the outer wall of the cylindrical rod (215). A ball bearing (217) is slidably connected in the groove wall of the arc-shaped groove (216). The ball bearing (217) is movably connected to the inner wall of the second collar (2141).

8. The multi-disc vacuum filter for pulp recycling according to claim 7, characterized in that: One end of the cylindrical rod (215) is fixedly connected to the rotating rod (218), and a Y-shaped plate (219) is rotatably connected to the rod of the rotating rod (218). The bottom end of the Y-shaped plate (219) is fixedly connected to the top outer wall of the rectangular groove plate (206).

9. The multi-disc vacuum filter for pulp recycling according to claim 1, characterized in that: The plates of each of the four double-headed blades (220) near the bottom are fixedly mounted to each corresponding rotating rod (218). The rotating rod (218) is rotatably connected to the top plate of the Y-shaped plate (219). The top plate of the Y-shaped plate (219) has a groove that can accommodate the double-headed blades (220) to rotate in contact.

10. The multi-disc vacuum filter for pulp recycling according to claim 1, characterized in that: The double-headed inclined blades (207) located near the first and last ends of the multi-disc vacuum filter body (1) are single blades, while each of the other double-headed inclined blades (207) located between the two filter discs (101) is a bidirectional blade.

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