A disc vacuum filter device

Abstract

The present application relates to the field of separation and filtration, and particularly relates to a disc type vacuum filter device. The device comprises a frame, a filter assembly and a plurality of discharge assemblies. The filter assembly comprises a plurality of filter discs arranged at intervals. Each of the discharge assemblies comprises a fixing frame and a discharge scraper. The fixing frame is installed on the frame and arranged horizontally with its length direction perpendicular to the axial direction of the supporting shaft. The discharge scraper is arranged on the fixing frame. The top of the discharge scraper is provided with a sawing part. The discharge scraper can slide up and down relative to the fixing frame and slide along the length direction of the fixing frame relative to the fixing frame. The sawing type discharge of the discharge scraper and the elastic reset of the discharge scraper can make the filter cake easier to peel off, reduce the discharge resistance, and keep the impurities in contact with the discharge scraper all the time, thereby maximizing the stability of the torque and reducing the wear of the bearing and the reduction box.

Description

Technical Field

[0001] This invention relates to the field of separation and filtration, and more specifically to a disc-type vacuum filtration device. Background Technology

[0002] A vacuum filter is a device that uses vacuum negative pressure to achieve solid-liquid separation. Under vacuum negative pressure (0.04-0.07MPa), the liquid in the suspension is drawn away through the filter medium, while the solid particles are trapped by the filter medium, thus achieving the separation of liquid and solid. Common types of vacuum filters mainly include belt filters, rotary drum filters, and disc filters.

[0003] To prevent mechanical damage, vacuum filters are equipped with overload protection components (such as torque limiters and overload relays), which automatically cut off power when the load exceeds the limit. For rotary drum or disc vacuum filters, during operation, sudden changes in material viscosity, excessively large solid particles, or insufficient pressure of washing water or backflushing compressed air can cause the filter cake to fail to detach properly and adhere to the surface of the drum or filter disc. The difficult-to-detach filter cake causes a sharp increase in the rotational resistance of the drum or filter disc, exceeding the rated torque of the motor and triggering overload protection to shut down. System shutdown will affect the continuity of the filtration system; at the same time, some material may accumulate on the discharge scraper, increasing the resistance to discharge and also increasing the probability of shutdown.

[0004] Furthermore, during discharge, the filter cake typically clumps together and falls off in large pieces, resulting in intermittent contact between the scraper and the filter cake. When the scraper is not in contact with the filter cake, the torque is at its minimum, and the torque increases after re-contact. This causes a torque peak during each discharge, resulting in significant periodic torque variations during operation. These periodic load variations accelerate the wear of bearings and reducers, affecting their service life.

[0005] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention proposes a disc vacuum filter device to solve the problems of high unloading resistance of existing vacuum filters, which easily leads to equipment shutdown, and the alternating load during unloading, which easily leads to wear of equipment parts.

[0007] The disc-type vacuum filtration device of the present invention adopts the following technical solution: including: The frame is equipped with a filter tank, which is used to hold the slurry to be filtered. A filtration assembly includes a support shaft, a first motor, several filter discs, and a vacuum pipeline unit. The support shaft is mounted on a frame and can rotate around its own axis. The first motor is mounted on the frame and its output shaft is connected to the support shaft. Several filter discs are spaced apart along the axial direction of the support shaft and can rotate under the drive of the support shaft. The bottom of the filter discs is located in a filter tank, and the interior of the filter discs is hollow and has a microporous structure. The vacuum pipeline unit is configured to evacuate the interior of the filter discs and discharge the filtered water entering the filter discs into a filter collection tank. The unloading assembly is located on one side of the frame and there are multiple unloading assemblies. The multiple unloading assemblies are arranged in pairs, with two assemblies in each pair corresponding to a filter disc and symmetrically arranged on both sides of the filter disc. The unloading assembly includes a fixed frame and an unloading scraper. The fixed frame is installed on the frame and is horizontally arranged with its length direction perpendicular to the axis of the support shaft. The unloading scraper is set on the fixed frame and has a serrated cutting section at the top. The unloading scraper is configured to be able to slide elastically up and down relative to the fixed frame and slide along the length direction of the fixed frame. When moving downward, it moves away from the axis of the support shaft along the length direction of the fixed frame.

[0008] Optionally, the unloading assembly also includes a lifting frame, which is slidably inserted into the fixed frame. The length direction of the lifting frame is parallel to the length direction of the fixed frame. A return spring is provided between the bottom of the lifting frame and the fixed frame. The return spring tends to bring the lifting frame to the upper limit position. The unloading scraper is slidably mounted on the lifting frame along the length of the lifting frame. A guide structure is provided between the unloading scraper and the fixed frame. The guide structure is configured such that when the lifting frame moves the unloading scraper downward, the unloading scraper moves away from the axis of the support shaft along the length of the lifting frame.

[0009] Optionally, the fixed frame includes a top plate and a bottom plate spaced apart vertically, and connecting blocks located at both ends of the top plate and the bottom plate and connecting the top plate and the bottom plate; the top plate is provided with lifting holes, the lifting frame includes a sliding connecting plate and sliding columns provided at both ends of the bottom surface of the sliding connecting plate, the sliding columns are slidably inserted into the lifting holes, and a return spring is provided between the sliding columns and the bottom plate of the fixed frame; the unloading scraper is provided with a sliding block, the sliding block is a T-shaped block, the top surface of the sliding connecting plate of the lifting frame is provided with a guide groove that passes through both ends, the shape of the guide groove is adapted to the shape of the sliding block, and the sliding block is slidably disposed in the guide groove.

[0010] Optionally, the guide structure includes a guide rod, which is disposed on the unloading scraper and extends vertically. A wedge-shaped surface is provided on the connecting block of the fixed frame. A movable hole is also provided on the top plate of the fixed frame. The movable hole is an elongated hole, the length direction of which is parallel to the length direction of the fixed frame and the length of which is greater than the outer circumference of the guide rod. The guide rod passes through the movable hole and abuts against the wedge-shaped surface.

[0011] Optionally, the mounting bracket also includes a side connecting plate, which is provided with a number of mounting slots. The mounting slots are arranged vertically at intervals and extend along the length of the mounting bracket. Each mounting slot is provided with a stop bar, and an elastic element is provided between the stop bar and the bottom of the mounting slot. The elastic element makes the stop bar tend to move out of the mounting slot. The side wall of the unloading scraper is provided with protrusions. There are multiple protrusions and they are arranged at intervals along the length of the unloading scraper. When the unloading scraper moves downward, the protrusions can abut against the baffle.

[0012] Optionally, the end of the stop bar near the protrusion has a first inclined surface and a second inclined surface, the first inclined surface being located on the upper surface of the stop bar and the second inclined surface being located on the lower surface of the stop bar, the slope of the first inclined surface being greater than the slope of the second inclined surface.

[0013] Optionally, the sawing portion of the discharge scraper is inclined toward the filter disc, and the side of the discharge scraper away from the filter disc includes a number of progressively connected inclined guide surfaces and a vertical surface connected to the bottom of the lowest inclined guide surface.

[0014] Optionally, the saw teeth of the sawing section are inclined surfaces, and the inclination direction is set from near the filter plate to far away from the filter plate, and the height of the bottom surface of the groove of the sawing section gradually decreases.

[0015] Optionally, the filter disc includes several unit plates, which are fan-shaped and detachably connected to the support shaft.

[0016] Optionally, the disc vacuum filter further includes a stirring mechanism configured to stir the slurry in the filter tank.

[0017] The beneficial effects of this invention are as follows: The disc-type vacuum filtration device of this invention improves the unloading assembly. During unloading, the sawing part of the unloading scraper embeds itself into the impurities attached to the outside of the filter disc, thereby pre-crushing the entire piece of impurities and initially reducing unloading resistance. Simultaneously, under the obstruction of the impurities, the unloading scraper moves downward relative to the fixed frame and outward along the length of the fixed frame, sawing the impurities and making them easier to detach, further reducing unloading resistance. This, in turn, minimizes the peak torque of the first motor, avoiding disruption during normal operation. Overload protection occurs, affecting work efficiency. Since the sawing section unloads material through pre-crushing and sawing, impurities will fall off in small pieces. When the unloading scraper cleans the impurities on the filter plate it contacts, the impurity-free area above the unloading scraper is relatively small. Moreover, the unloading scraper can quickly and elastically reset upwards after unloading, allowing the sawing section to quickly contact the impurities again. Through the combination of the unloading method of the unloading scraper and the automatic reset action of the unloading scraper, the impurities can always maintain contact with the unloading scraper, thereby maximizing the stability of torque and reducing wear on bearings and gearboxes. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a disc-type vacuum filtration device according to the present invention; Figure 2 This is a front view of a disc-type vacuum filtration device according to the present invention; Figure 3 for Figure 2 Sectional view of AA; Figure 4 for Figure 2 Enlarged view at point X; Figure 5 This is a schematic diagram of the material cutting assembly in this invention; Figure 6 Side view of the unloading assembly; Figure 7 for Figure 6 BB section view; Figure 8 for Figure 7 Enlarged view at point W; Figure 9 This is a diagram showing the positional relationship between the unloading assembly and the filter disc (only one unit plate is shown) in this invention; Figure 10 This is an exploded view of the unloading assembly in this invention; Figure 11 This is a side view of the unloading scraper in the unloading assembly; Figure 12 for Figure 11 Enlarged view at point Y; Figure 13 This is a schematic diagram of the fixing frame in the unloading assembly; Figure 14 This is a schematic diagram of the structure of a disc-type vacuum filtration device of the present invention, with the unloading assembly hidden. Figure 15 for Figure 14 Enlarged view of the Z-axis.

[0020] In the picture: 100. Frame; 101. Bolt holes; 102. Filter tank; 210. Support shaft; 220. Filter disc; 230. First motor; 300. Unloading assembly; 310. Fixing frame; 311. Top plate; 3111. Lifting hole; 3112. Movable hole; 3113. Mounting hole; 312. Base plate; 313. Connecting block; 3131. Wedge-shaped surface; 314. Side connecting plate; 320. Connecting bolts; 330. Lifting frame; 331. Sliding connecting plate; 3311. Guide groove; 332. Sliding column; 340. Unloading scraper; 3401. Sawing section; 3402. Protrusion; 341. Sliding block; 342. Guide rod; 350. Stop bar; 351. First inclined plane; 352. Second inclined plane; 360°, return spring; 410. Second motor; 420. Transmission rod; 430. Stirring rack. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 15 As shown, an embodiment of the present invention provides a disc vacuum filtration device including a frame 100, a filtration assembly, and a discharge assembly 300; A filter tank 102 is provided on the frame 100, and the filter tank 102 is used to hold the slurry to be filtered. The filtration assembly includes a support shaft 210, a first motor 230, several filter discs 220, and a vacuum pipeline unit. The support shaft 210 is mounted on the frame 100 and can rotate around its own axis. The first motor 230 is mounted on the frame 100, and its output shaft is connected to the support shaft 210 to drive the support shaft 210 to rotate, providing power to the support shaft 210. Several filter discs 220 are spaced apart along the axial direction of the support shaft 210 on its outer side and can rotate under the drive of the support shaft 210. The bottom of each filter disc 220 is located inside a filter tank 102, allowing it to be immersed in the slurry to be filtered. The filter discs 220 are hollow and have a microporous structure. The vacuum pipeline unit is configured to evacuate the inside of the filter discs 220 and discharge the filtered liquid entering the filter discs 220 into a filter collection tank. The vacuum pipeline unit specifically includes a vacuum pump and connecting pipes, and its structure is similar to that in existing vacuum filters, so it will not be described in detail here. After startup, as the support shaft 210 rotates, the bottom of the filter disc 220 is continuously immersed in the slurry to be filtered. Dehydration is achieved through capillary action and suction. The filtered liquid enters the filter disc 220 and is continuously discharged through the vacuum pipeline unit, while the filter residue accumulates on the outside of the filter disc 220 to form a filter cake. The filter disc 220 is characterized by numerous micropores that generate capillary action. Specifically, the filter disc 220 can be made of a ceramic disc, constructed from hydrophilic sintered alumina, and is covered with micropores with a diameter of 1.5-2 μm. Each micropore acts as a capillary. Due to the surface tension between water and the hydrophilic sintered alumina micropores, the micropores will not release water when the pore size is appropriate. The capillary force within the micropores is greater than the force applied by the vacuum, keeping the micropores filled with liquid. Air is not allowed to pass through under any circumstances. Since no airflow passes through the filter disc 220, energy consumption is extremely low; a very small vacuum pump can serve as the vacuum source. The unloading assembly 300 is located on one side of the frame 100 and there are multiple unloading assemblies 300. The multiple unloading assemblies 300 are arranged in pairs, with each pair corresponding to a filter disc 220 and symmetrically arranged on both sides of the filter disc 220, so that the filter cake formed on the filter disc 220 can be scraped off when the filter disc 220 rotates. The unloading assembly 300 includes a fixed frame 310 and an unloading scraper 340. The fixed frame 310 is mounted on the frame 100 and is horizontally arranged with its length direction perpendicular to the axial direction of the support shaft 210. The unloading scraper 340 is disposed on the fixed frame 310 and has a serrated cutting portion 3401 at its top. The unloading scraper 340 is configured to be able to slide elastically up and down relative to the fixed frame 310 and slide along the length direction of the fixed frame 310. When moving downward, it moves away from the axis of the support shaft 210 along the length direction of the fixed frame 310.

[0023] Understandably, in traditional filter devices, when the scraper discharges the filter cake, the blade at the top of the scraper enters the filter cake. As the filter disc 220 rotates, the depth of the scraper entering the filter cake increases, gradually prying the filter cake off the filter disc 220. The discharge resistance is relatively large. At the same time, the filter cake falls off in large pieces. After each discharge, there is a section above the scraper that is free of impurities. Then, as the filter disc 220 rotates, the scraper comes into contact with impurities again. This can easily cause intermittent contact between the scraper and the filter cake, generating alternating loads and accelerating the wear of the bearings and reducer.

[0024] In this embodiment, during unloading, the support shaft 210 drives any point on the filter disc 220 to rotate until it contacts the unloading scraper 340. The sawing portion 3401 of the unloading scraper 340 embeds into the impurities (filter cake) attached to the outside of the filter disc 220, thereby pre-crushing the entire piece of impurities and initially reducing the unloading resistance. At the same time, under the obstruction of the impurities, the unloading scraper 340 moves downward relative to the fixed frame 310 and outward along the length direction of the fixed frame 310 (the axis closer to the support shaft 210 is inward, and vice versa), sawing the impurities to make them easier to fall off, further reducing the unloading resistance, and thus minimizing the peak power of the first motor 230. Torque is controlled to prevent overload protection during normal operation, which would affect work efficiency. Furthermore, since the sawing section 3401 unloads material through pre-crushing and sawing, impurities will fall off in small pieces. When the unloading scraper 340 cleans the impurities on the filter plate it contacts, the impurity-free area above the unloading scraper 340 is relatively small. Moreover, the unloading scraper 340 can quickly and elastically reset upwards after unloading, allowing the sawing section 3401 to quickly contact the impurities again. Through the combination of the unloading method of the unloading scraper 340 and the automatic reset action of the unloading scraper 340, the impurities can always maintain contact with the unloading scraper 340, thereby maximizing the stability of torque and reducing wear on bearings and gearboxes.

[0025] In a further embodiment, in order to realize the action of the unloading scraper 340, the unloading assembly 300 also includes a lifting frame 330, which is slidably inserted into the fixed frame 310. The length direction of the lifting frame 330 is parallel to the length direction of the fixed frame 310. A return spring 360 is provided between the bottom of the lifting frame 330 and the fixed frame 310. The return spring 360 has a tendency to make the lifting frame 330 reach the upper limit position. The unloading scraper 340 is slidably disposed on the lifting frame 330 along the length direction of the lifting frame 330. A guide structure is provided between the unloading scraper 340 and the fixed frame 310. The guide structure is configured such that when the lifting frame 330 drives the unloading scraper 340 to move downward, the unloading scraper 340 moves along the length direction of the lifting frame 330 in a direction away from the axis of the support shaft 210.

[0026] Furthermore, to facilitate the vertical sliding connection between the lifting frame 330 and the fixed frame 310, the fixed frame 310 includes a top plate 311 and a bottom plate 312 spaced vertically apart, and a connecting block 313 located at both ends of the top plate 311 and the bottom plate 312 and connecting the top plate 311 and the bottom plate 312; the top plate 311 is provided with a lifting hole 3111, the lifting frame 330 includes a sliding connecting plate 331 and sliding columns 332 provided at both ends of the bottom surface of the sliding connecting plate 331, the sliding columns 332 are slidably inserted into the lifting hole 3111, and a return spring 360 is provided between the sliding column 332 and the bottom plate 312 of the fixed frame 310.

[0027] Furthermore, the lifting hole 3111 is polygonal, preferably quadrilateral, and its shape matches the shape of the sliding column 332. This ensures that the lifting frame 330 cannot rotate relative to the fixed frame 310, but can only move up and down relative to the fixed frame 310, thus ensuring the reliability of the lifting frame 330's up and down movement. A limit plate is provided on the sliding column 332, located below the top plate 311 of the fixed frame 310. The outer circumference of the limit plate is larger than the size of the lifting hole 3111, thereby cooperating with the stop of the top plate 311 to limit the upper limit position of the sliding column 332.

[0028] Furthermore, to facilitate the sliding connection between the unloading scraper 340 and the lifting frame 330, a sliding block 341 is provided on the unloading scraper 340. The sliding block 341 is a T-shaped block. The top surface of the sliding connecting plate 331 of the lifting frame 330 is provided with a guide groove 3311 that runs through both ends. The shape of the guide groove 3311 is adapted to the shape of the sliding block 341. The sliding block 341 is slidably disposed in the guide groove 3311, thus realizing the sliding connection between the unloading scraper 340 and the lifting frame 330.

[0029] In a further embodiment, the guide structure includes a guide rod 342, which is disposed on the unloading scraper 340 and extends vertically. A wedge-shaped surface 3131 is provided on the connecting block 313 of the fixing frame 310, and a movable hole 3112 is also provided on the top plate 311 of the fixing frame 310. The guide rod 342 passes through the movable hole 3112 and abuts against the wedge-shaped surface 3131. The movable hole 3112 is an elongated hole, and the length direction of the movable hole 3112 is parallel to the length direction of the fixing frame 310. The length of the movable hole 3112 is greater than the outer circumference of the guide rod 342, thereby enabling the guide rod 342 to move along the movable hole 3112.

[0030] During the rotation of the filter disc 220, the discharge scraper 340 moves downward under the pushing action of the filter cake. During the downward movement of the discharge scraper 340, under the guidance of the guide rod 342 and the wedge surface 3131, the discharge scraper 340 slides outward along the lifting frame 330. The sawing part 3401 of the discharge scraper 340 produces a sawing effect on the filter cake, improving the discharge efficiency and reducing the discharge resistance.

[0031] Furthermore, to maintain force balance and improve the smoothness of movement, two guide rods 342 are provided. The two guide rods 342 are located at both ends of the unloading scraper 340, specifically at the bottom ends of the sliding block 341 on the unloading scraper 340. The movable hole 3112 is located on the side of the lifting hole 3111 away from the center of the fixed frame 310 in the length direction. The two connecting blocks 313 of the fixed frame 310 are provided with wedge-shaped surfaces 3131. The two wedge-shaped surfaces 3131 face the same direction. The guide post, movable hole 3112 and wedge-shaped surface 3131 correspond one-to-one to improve the smoothness of guidance.

[0032] In a further embodiment, the fixing frame 310 also includes a side connecting plate 314, on which a plurality of mounting slots are provided. The plurality of mounting slots are arranged vertically at intervals and extend along the length direction of the fixing frame 310. Each mounting slot is provided with a stop bar 350. An elastic element is provided between the stop bar 350 and the bottom of the mounting slot. The elastic element causes the stop bar 350 to have a tendency to move out of the mounting slot. The side wall of the unloading scraper 340 is provided with protrusions 3402. There are multiple protrusions 3402 and they are arranged at intervals along the length of the unloading scraper 340. When the unloading scraper 340 moves downward, the protrusions 3402 can abut against the baffle 350.

[0033] In this embodiment, the protrusion 3402 and the baffle 350 work together to make the unloading scraper 340 exhibit a jerky and shaky state as it moves up and down relative to the fixed frame 310. This can accelerate the removal of impurities from the unloading scraper 340 and prevent the accumulation of impurities from affecting the unloading process.

[0034] Furthermore, the end of the stop bar 350 near the protrusion 3402 has a first inclined surface 351 and a second inclined surface 352. The first inclined surface 351 is located on the upper surface of the stop bar 350, and the second inclined surface 352 is located on the lower surface of the stop bar 350. The slope of the first inclined surface 351 is greater than the slope of the second inclined surface 352.

[0035] In this embodiment, when the unloading scraper 340 moves downward, the slope of the first inclined surface 351 is relatively large, and the resistance caused by the protrusion 3402 and the baffle 350 to the downward movement of the unloading scraper 340 is small, making the unloading smoother. When the unloading scraper 340 moves upward to reset, the slope of the second inclined surface 352 is relatively small, and the reset resistance of the unloading scraper 340 is large. As a result, the unloading scraper 340 mainly exhibits a jerky and shaky state when resetting upward, which accelerates the removal of impurities on the unloading scraper 340 and prevents impurities from accumulating.

[0036] In a further embodiment, the sawing portion 3401 of the discharge scraper 340 is inclined toward the filter plate 220, and the side of the discharge scraper 340 away from the filter plate 220 includes a plurality of inclined guide surfaces connected in stages and a vertical surface connected to the bottom of the lowest inclined guide surface. By setting the inclined guide surfaces, the discharged filter cake can be smoothly guided to the storage hopper (not shown in the figure).

[0037] In a further embodiment, the saw tooth surface of the sawing part 3401 is an inclined surface, and the inclined direction is set from near the filter plate 220 to away from the filter plate 220. The height of the bottom surface of the groove of the sawing part 3401 gradually decreases, so that impurities can slide downward and outward through the groove, thereby improving the guiding effect on impurities and reducing the accumulation of impurities in the groove of the sawing part 3401.

[0038] In a further embodiment, the mounting bracket 310 is detachably mounted to the frame 100 by connecting bolts 320. Specifically, the top plate 311 of the mounting bracket 310 has mounting holes 3113 at both ends, and the frame 100 has bolt holes 101 corresponding to the mounting holes 3113. The connecting bolts 320 pass through the mounting holes 3113 and the bolt holes 101 and are screwed into the bolt holes 101.

[0039] In a further embodiment, the filter disc 220 includes several unit plates, which are fan-shaped and detachably connected to the support shaft 210. This arrangement facilitates the connection and installation of pipelines, and also facilitates the maintenance and replacement of the filter disc 220.

[0040] In a further embodiment, the disc vacuum filter of the present invention further includes a stirring mechanism configured to stir the slurry in the filter tank 102 to improve the filtration effect.

[0041] In one preferred embodiment of the present invention, the stirring mechanism includes a second motor 410, a transmission rod 420 and a stirring frame 430. The second motor 410 is disposed on the frame 100 and is a dual-output shaft motor. A transmission rod 420 is eccentrically connected to each output shaft of the second motor 410. The mixing rack 430 includes a bottom grid plate and side rods connected to both sides of the bottom grid plate. The length direction of the bottom grid plate is parallel to the axial direction of the support shaft 210. The bottom grid plate is located at the bottom of the filter plate 220. The side rods are provided with a first hinge point and a second hinge point. The first hinge point is located at the top of the side rod, and the second hinge point is located below the first hinge point and above the hinge position between the support shaft 210 and the frame 100. The first hinge point of the side rod is hinged to the transmission rod 420, and the second hinge point of the side rod is rotatably connected to the frame 100.

[0042] During operation, the second motor 410 starts and drives the transmission rod 420 to rotate eccentrically. The transmission rod 420 drives the side rod to swing back and forth around the second hinge point, thereby causing the bottom grid plate to continuously stir the slurry in the filter tank 102 and improve the filtration effect.

[0043] Based on the above embodiments, the usage principle and working process of the present invention are as follows: Reference Figure 1 Taking the unloading assembly 300 located on the right side of the frame 100 as an example, during operation, the slurry to be filtered is introduced into the filter tank 102. The first motor 230 and the second motor 410 are started. The first motor 230 drives the filter disc 220 to rotate clockwise through the support shaft 210, and the second motor 410 drives the stirring frame 430 to rotate through the transmission rod 420, thereby agitating the slurry containing the slurry in the filter tank 102. The vacuum pipeline unit is started. After the slurry in the filter tank 102 is filtered by the filter disc 220, the filtrate enters the interior of the filter disc 220 and is discharged through the pipeline. Impurities adhere to the outside of the filter disc 220 to form a filter cake. At the same time, during the rotation of the filter disc 220, when any point on the filter disc 220 rotates to the unloading assembly 300, the impurities attached to it are scraped off by the unloading assembly 300, thereby achieving unloading.

[0044] During the unloading process, when the unloading scraper 340 initially contacts the impurities attached to the surface of the filter disc 220, the sawing part 3401 at the top of the unloading scraper 340 embeds itself into the impurities, pre-crushing the entire piece of impurities. Simultaneously, the unloading scraper 340 is subjected to a clockwise pushing force due to the obstruction of the impurities, thus generating a downward tendency. As the resistance increases, the unloading scraper 340 overcomes the elastic force of the return spring 360 between the lifting frame 330 and the fixed frame 310 and moves downward. When the unloading scraper 340 moves downward, the guide rod 342 and the wedge... Guided by the surface 3131, the scraper 340 moves radially outward. When the scraper 340 moves radially, the sawing part 3401 saws the impurities, which can further improve the ability of impurities to fall off the filter disc 220. Compared with the traditional scraper 340, the present invention can more easily achieve unloading by setting the sawing part 3401 on the scraper 340 and combining it with the radial movement of the scraper 340, avoiding large pieces of impurities falling off, reducing unloading resistance, and thus minimizing the peak torque of the motor, avoiding overload protection during normal operation, and affecting work efficiency.

[0045] When the discharge scraper 340 removes impurities from the filter disc 220 it contacts, the impurities slide down the side of the discharge scraper 340 away from the filter disc 220 into the storage hopper (not shown in the figure). There will be a small impurity-free area above the discharge scraper 340. At this time, the discharge scraper 340 quickly returns to its original position under the action of the return spring 360, so that the sawing part 3401 can quickly come into contact with the impurities again. The sawing of impurities by the discharge scraper 340 can minimize the size of the impurity-free area. At the same time, combined with the automatic reset of the discharge scraper 340, the impurities can always be kept in contact with the discharge scraper 340, thereby maximizing the stability of the motor torque, avoiding the equipment from working under alternating load for a long time, and reducing the impact and wear on the bearings and gearbox.

[0046] During the up-and-down movement of the unloading scraper 340 relative to the fixed frame 310, the protrusion 3402 and the stop strip 350 cooperate. When the unloading scraper 340 moves downward (unloading), due to the large slope of the first inclined surface 351, the resistance caused by the protrusion 3402 and the stop strip 350 to the downward movement of the unloading scraper 340 is small, making the unloading smoother. When the unloading scraper 340 moves upward (resetting), due to the small slope of the second inclined surface 352, the resetting resistance of the unloading scraper 340 is large. This causes the unloading scraper 340 to mainly exhibit a jerky and shaky state when resetting upward, which can accelerate the removal of impurities on the unloading scraper 340 and prevent impurities from accumulating and affecting the unloading resistance. At the same time, the saw tooth surface of the sawing part 3401 is set as an inclined surface, which improves the guiding effect on impurities and reduces the accumulation of impurities in the tooth groove of the sawing part 3401.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A disc-type vacuum filtration device, characterized in that, include: The frame is equipped with a filter tank, which is used to hold the slurry to be filtered. A filter assembly, comprising a support shaft, several filter discs, and a vacuum tubing unit; The support shaft is mounted on the frame and can rotate around its own axis; several filter discs are spaced apart along the axial direction of the support shaft on the outside of the support shaft and can rotate under the drive of the support shaft. The filter discs are hollow inside and have a microporous structure; the vacuum pipeline unit is configured to evacuate the inside of the filter discs and discharge the filtered water entering the filter discs into the filter collection tank. The unloading assembly is located on one side of the frame and there are multiple unloading assemblies. The multiple unloading assemblies are arranged in pairs, with two assemblies in each pair corresponding to a filter disc and symmetrically arranged on both sides of the filter disc. The unloading assembly includes a fixed frame and an unloading scraper. The fixed frame is installed on the frame and is horizontally arranged with its length direction perpendicular to the axis of the support shaft. The unloading scraper is arranged on the fixed frame and has a serrated cutting section at the top. The unloading scraper is configured to be able to slide elastically up and down relative to the fixed frame and slide along the length direction of the fixed frame. When moving downward, it moves away from the axis of the support shaft along the length direction of the fixed frame. The unloading assembly also includes a lifting frame, which is slidably inserted into the fixed frame. The length direction of the lifting frame is parallel to the length direction of the fixed frame. A return spring is provided between the bottom of the lifting frame and the fixed frame. The return spring tends to bring the lifting frame to the upper limit position. The unloading scraper is slidably mounted on the lifting frame along the length of the lifting frame. A guide structure is provided between the unloading scraper and the fixed frame. The guide structure is configured such that when the lifting frame drives the unloading scraper to move downward, the unloading scraper moves away from the axis of the support shaft along the length of the lifting frame. The fixed frame includes a top plate and a bottom plate spaced apart vertically, and connecting blocks located at both ends of the top plate and the bottom plate and connecting the top plate and the bottom plate; the top plate is provided with lifting holes, the lifting frame includes a sliding connecting plate and sliding columns provided at both ends of the bottom surface of the sliding connecting plate, the sliding columns are slidably inserted into the lifting holes, and a return spring is provided between the sliding columns and the bottom plate of the fixed frame; the unloading scraper is provided with a sliding block, the sliding block is a T-shaped block, the top surface of the sliding connecting plate of the lifting frame is provided with a guide groove that passes through both ends, the shape of the guide groove is adapted to the shape of the sliding block, and the sliding block is slidably disposed in the guide groove; The guiding structure includes a guide rod, which is set on the unloading scraper and extends vertically. A wedge-shaped surface is provided on the connecting block of the fixed frame. A movable hole is also provided on the top plate of the fixed frame. The movable hole is an elongated hole. The length direction of the movable hole is parallel to the length direction of the fixed frame and the length of the movable hole is greater than the outer circumference of the guide rod. The guide rod passes through the movable hole and abuts against the wedge-shaped surface.

2. The disc-type vacuum filtration device according to claim 1, characterized in that, The mounting bracket also includes a side connecting plate, which has several mounting slots. The mounting slots are arranged vertically at intervals and extend along the length of the mounting bracket. Each mounting slot has a stop bar, and an elastic element is provided between the stop bar and the bottom of the mounting slot. The elastic element makes the stop bar tend to move out of the mounting slot. The side wall of the unloading scraper is provided with protrusions. There are multiple protrusions and they are arranged at intervals along the length of the unloading scraper. When the unloading scraper moves downward, the protrusions can abut against the baffle.

3. The disc-type vacuum filtration device according to claim 2, characterized in that, The end of the stop bar near the protrusion has a first inclined surface and a second inclined surface. The first inclined surface is located on the upper surface of the stop bar, and the second inclined surface is located on the lower surface of the stop bar. The slope of the first inclined surface is greater than the slope of the second inclined surface.

4. The disc-type vacuum filtration device according to claim 1, characterized in that, The sawing section of the discharge scraper is inclined toward the filter plate, and the side of the discharge scraper away from the filter plate includes several progressively connected inclined guide surfaces and a vertical surface connected to the bottom of the lowest inclined guide surface.

5. A disc-type vacuum filtration device according to claim 1, characterized in that, The saw teeth of the sawing section are inclined, and the inclination direction is set from near the filter plate to far away from the filter plate. The height of the bottom surface of the groove of the sawing section gradually decreases.

6. A disc-type vacuum filtration device according to claim 1, characterized in that, The filter disc includes several unit plates, which are fan-shaped and detachably connected to the support shaft.

7. A disc-type vacuum filtration device according to claim 1, characterized in that, The disc vacuum filter also includes a stirring mechanism configured to stir the slurry in the filter tank.

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