A sewage filtering device

Abstract

The present invention relates to the field of sewage treatment, and in particular to a sewage filtering device, comprising a shell, a filter cartridge, an induction plate, an adjusting component, a transmission component and a cleaning component. After the sewage is filtered through the side wall of the filter cartridge, it flows out and impacts the induction plate to move downward. A first elastic component is arranged between the induction plate and the shell. When the force of water flow on the induction plate is reduced to a first preset value, the first elastic component prompts the induction plate to move upward. When the induction plate moves upward, the transmission component drives the cleaning component to move downward to push the blockage on the side wall of the filter cartridge to the bottom of the filter cartridge. The adjusting mechanism comprises a force-increasing component and a speed-regulating component. The force-increasing component reduces the first preset value as the impurities in the filter cartridge increase, so as to avoid the frequent upward movement of the induction plate caused by the gradual reduction of the force of water flow on the induction plate when the impurities accumulate in the filter cartridge. The speed-regulating component reduces the downward displacement of the cleaning component as the impurities in the filter cartridge increase, so as to avoid the cleaning component cleaning to the impurity accumulation position.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a sewage filtering device. Background Art

[0002] The treatment of domestic sewage and industrial sewage has always been an important topic in the field of environmental protection. Before disinfecting the water, solid impurities in the sewage need to be removed. In the prior art, there are many ways to remove solid impurities in sewage, among which the most commonly used method is filtration. For example, the invention patent with authorization announcement number CN109890477B discloses a filtration device that uses a hollow cylindrical filter element for filtration. This filtration method can concentrate impurities in the filter element for easy collection and cleaning. However, solid impurities are easy to adhere to the inner wall of the filter element, which requires frequent cleaning and affects the filtration efficiency. Therefore, a filtration device that can self-clean the inner wall of the filter element is needed to reduce the frequency of manual cleaning and extend the use time. Summary of the invention

[0003] After analysis, it was found that the accumulation of sediment on the filter will cause the effective filtration area of ​​the filter to decrease. At this time, the cleaning should also change with the reduction of the filtration area. Similarly, the filter where the sediment accumulates does not need to be cleaned to prevent the sediment at the bottom from being stirred up and accelerating the degree of clogging of the filter.

[0004] The invention provides a sewage filtering device to solve the problem that the filter screen of the existing filtering device is easily clogged and needs to be frequently cleaned.

[0005] A sewage filtering device of the present invention adopts the following technical solution:

[0006] A sewage filtering device comprises a shell, a filter cartridge, an induction plate, an adjustment mechanism, a transmission assembly and a cleaning member; the filter cartridge and the induction plate can be slidably installed in the shell up and down, and the induction plate is located below the filter cartridge, the sewage flows out after being filtered by the side wall of the filter cartridge and impacts the induction plate to move the induction plate downward, and the water level of the sewage in the filter cartridge is constant; a first elastic member is arranged between the induction plate and the shell, the first elastic member is squeezed when the induction plate moves downward, and the first elastic member prompts the induction plate to move upward when the force of the water flow on the induction plate is reduced to a first preset value; the cleaning member adheres to the inner wall of the filter cartridge and pushes the blockage on the side wall of the filter cartridge to the bottom of the filter cartridge when it moves downward; when the induction plate moves upward, the cleaning member is driven downward by the transmission assembly, and when it moves downward, the cleaning member is driven upward by the transmission rent; the adjustment mechanism comprises a force-increasing assembly and a speed-regulating assembly, the force-increasing assembly makes the first preset value decrease as the impurities in the filter cartridge increase, and the speed-regulating assembly makes the displacement of the cleaning member moving downward decrease as the impurities in the filter cartridge increase.

[0007] Furthermore, a drainage pipe connected to the interior of the filter cartridge is provided at a preset height on the side wall of the filter cartridge, thereby maintaining the water level of the sewage in the filter cartridge at a preset height; the filter cartridge is suspended above the induction plate, and when the internal impurities increase and the gravity of the filter cartridge increases, the filter cartridge moves downward to squeeze the telescopic sleeve.

[0008] Furthermore, the force-increasing component includes a block, a second elastic member and a telescopic push rod, the block can be horizontally slidably installed in the shell and is connected to the shell through the second elastic member, when the block moves outward, the second elastic member is squeezed, and the upper end surface of the block is an inclined surface which is higher inside and lower outside; the telescopic push rod is vertically arranged, the upper end of the telescopic push rod is connected to the filter cartridge, and the lower end of the telescopic push rod abuts against the inclined surface of the upper end of the block, when the induction plate moves upward, the block can be squeezed to move outward or has a tendency to move outward, and when the block moves outward, the inclined surface of the upper end pushes the telescopic push rod upward; until the force of the water flow on the induction plate is reduced to a first preset value, the induction plate continues to move upward after passing over the block under the action of the first elastic member; as the filter cartridge moves downward, the top pressure of the telescopic push rod on the block increases, and the resistance of the block to the induction plate increases, and then when the first preset value is further reduced, the induction plate can pass over the block under the action of the first elastic member.

[0009] Furthermore, a notch is provided on the sensing plate at a position below the corresponding stopper, and the upper end of the notch is an arc surface, so as to push the stopper to move outward when the sensing plate moves upward, and a push plate is provided at the lower end of the sensing plate. After the sensing plate passes over the stopper, the push plate prevents the stopper from extending out under the action of the second elastic member, so as to prevent the stopper from hindering the sensing plate from returning to under the stopper.

[0010] Furthermore, the transmission assembly includes a first rack, a first gear and a second rack. The first rack and the second rack are both vertically arranged, and the first rack is connected to the sensing plate, and the second rack is connected to the cleaning member. The first gear is installed in the shell and rotates around a horizontal axis and meshes with the first rack. The first rack drives the first gear to rotate when the sensing plate moves upward, and the first gear drives the second rack to move downward, thereby causing the cleaning member to move downward.

[0011] Furthermore, the speed regulating assembly includes a third rack, a second gear, a sliding cylinder, a speed regulating wheel, a support shaft, a transmission belt, a transmission wheel and a third gear. The support shaft is horizontally and fixedly installed in the shell, and the first gear and the second gear are both rotatably installed on the support shaft; the third rack is vertically arranged and fixedly connected to the filter cylinder, and the second gear is meshed with the third rack; the speed regulating wheel can slide axially along the support shaft and rotate synchronously with the first gear, the outer circumference of the speed regulating wheel is a conical surface, the transmission wheel is rotatably installed in the shell, the transmission belts are respectively installed on the speed regulating wheel and the transmission wheel, the speed regulating wheel rotates with the first gear and drives the transmission wheel through the transmission belt The third gear is engaged with the second rack; the sliding cylinder is threadedly matched with the support shaft, and the sliding cylinder and the second gear rotate synchronously and can slide axially along the support shaft relative to the second gear; the sliding cylinder and the speed regulating wheel can rotate relatively and move axially along the support shaft synchronously; the third rack drives the second gear to rotate when the filter cylinder moves downward; the sliding cylinder rotates synchronously with the second gear and pushes the speed regulating wheel to move toward the large end of the outer circumferential cone surface of the speed regulating wheel in cooperation with the thread of the support shaft, so that when the induction plate moves upward by the same displacement, the displacement of the cleaning member moving downward is reduced.

[0012] Furthermore, the cleaning part includes a scraper and a connecting rod. The connecting rod can slide up and down through the filter cartridge and is fixedly connected to the second rack. The scraper fits the inner wall of the filter cartridge and is connected to the connecting rod. When moving downward with the connecting rod, the scraper pushes the impurities on the filter cartridge to the bottom of the filter cartridge.

[0013] Furthermore, the speed regulating assembly also includes a tensioning column, which is an elastic and retractable structure and always tightens the transmission belt.

[0014] Furthermore, a water storage barrel is arranged in the shell, and the water storage barrel is connected to the filter cartridge through a drain pipe, and the water storage barrel and the filter cartridge are communicated through the drain pipe; a telescopic sleeve is arranged between the water storage barrel and the shell, and the telescopic sleeve is squeezed when the water storage barrel and the filter cartridge move downward; a drain outlet is arranged at a preset height of the water storage barrel, so that the water level of the sewage in the filter cartridge is maintained at a preset height.

[0015] Furthermore, the telescopic sleeve includes a first sleeve rod, a first inner rod and a spring connecting the first sleeve rod and the first inner rod, one end of the first sleeve rod is slidably connected to one end of the first inner rod, the other end of the first sleeve rod is fixed to the shell, and the other end of the first inner rod is connected to the filter cartridge.

[0016] The beneficial effects of the present invention are as follows: the sewage filtering device of the present invention utilizes the water flow after filtering of the filter cartridge to impact the induction plate, and when the filter cartridge is blocked and the force of the water flow on the induction plate is reduced to the first preset value, the induction plate moves upward under the action of the first elastic member and drives the cleaning member to move downward through the transmission assembly, and the cleaning member moves downward to push the blockage on the side wall of the filter cartridge to the bottom of the filter cartridge, thereby relieving the blockage on the side wall of the filter cartridge, extending the service life of the filter cartridge and reducing the number of manual cleaning times. At the same time, the force-increasing assembly reduces the first preset value as the impurities in the filter cartridge increase, thereby avoiding the accumulation of impurities in the filter cartridge, and the force of the water flow on the induction plate gradually decreases, resulting in the frequent upward movement of the induction plate; the speed regulating assembly reduces the displacement of the cleaning member moving downward as the impurities in the filter cartridge increase, thereby avoiding the cleaning member cleaning to the impurity accumulation position.

[0017] Furthermore, by setting a stopper, resistance is provided for the upward movement of the induction plate, so that the induction plate moves upward quickly after passing over the stopper, thereby preventing the induction plate from moving slowly and causing the cleaning member to fail to clean properly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a sewage filtering device of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of a housing in an embodiment of a sewage filtering device of the present invention;

[0021] Figure 3 It is a side cross-sectional view of the overall structure of an embodiment of the sewage filtering device of the present invention;

[0022] Figure 4 for Figure 3 The enlarged schematic diagram at A in the middle;

[0023] Figure 5 It is a front cross-sectional view of the overall structure of an embodiment of the sewage filtering device of the present invention;

[0024] Figure 6 for Figure 5 The enlarged schematic diagram of point B in the middle;

[0025] Figure 7 A top view of the adjusting mechanism and the transmission assembly in the embodiment of the sewage filtering device of the present invention;

[0026] Figure 8 It is an exploded schematic diagram of a support shaft and a structure mounted on the support shaft in an embodiment of a sewage filtering device of the present invention;

[0027] Fig. 9 It is a partial structural schematic diagram of the speed regulating component in an embodiment of the sewage filtering device of the present invention;

[0028] In the figure: 100, shell; 110, water storage barrel; 111, drain outlet; 120, water inlet pipe; 200, filter cartridge; 210, drain pipe; 220, telescopic sleeve; 300, induction plate; 310, first elastic member; 320, support cylinder; 330, push plate; 400, adjustment mechanism; 410, force-increasing assembly; 411, stopper; 412, telescopic push rod; 420, speed regulating assembly; 421, third rack; 422, second gear; 423, sliding cylinder; 424, speed regulating wheel; 425, support shaft; 426, transmission belt; 427, transmission wheel; 428, third gear; 429, tensioning column; 500, transmission assembly; 510, first rack; 520, first gear; 530, second rack; 600, cleaning member; 610, scraper; 620, connecting rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] An embodiment of a sewage filtering device of the present invention is as follows Figures 1 to 9 As shown, it includes a housing 100, a filter cartridge 200, a sensing plate 300, an adjustment mechanism 400, a transmission assembly 500 and a cleaning member 600;

[0031] The filter cartridge 200 has an upper end opening and a lower end closed, and the side wall of the filter cartridge 200 is provided with filter holes, the induction plate 300 is arranged horizontally and is located below the filter cartridge 200, the filter cartridge 200 and the induction plate 300 can be installed in the housing 100 so as to slide up and down, and the housing 100 is provided with a water inlet pipe 120, and the sewage enters the filter cartridge 200 from the water inlet pipe 120, and the sewage flows out after being filtered by the side wall of the filter cartridge 200 and impacts the induction plate 300 to make the induction plate 300 move downward, and the sewage in the filter cartridge 200 is The water level is constant; a first elastic member 310 is provided between the sensing plate 300 and the housing 100, and the first elastic member 310 is a compression spring. When the sensing plate 300 moves downward, the first elastic member 310 is squeezed. A support tube 320 is provided between the lower side of the sensing plate 300 and the housing 100, and the support tube 320 limits the extreme position of the sensing plate 300 moving downward. When the force of the water flow on the sensing plate 300 is reduced to a first preset value, the first elastic member 310 prompts the sensing plate 300 to move upward;

[0032] The cleaning member 600 is attached to the inner wall of the filter cartridge 200 and pushes the blockage on the side wall of the filter cartridge 200 to the bottom of the filter cartridge 200 when moving downward;

[0033] When the induction plate 300 moves upward, the cleaning member 600 is driven to move downward through the transmission assembly 500, and when the induction plate 300 moves downward, the cleaning member 600 is driven to move upward through the transmission assembly 500;

[0034] The adjustment mechanism 400 includes a force-enhancing component 410 and a speed-regulating component 420 . The force-enhancing component 410 reduces the first preset value as the amount of impurities in the filter cartridge 200 increases. The speed-regulating component 420 reduces the downward displacement of the cleaning member 600 as the amount of impurities in the filter cartridge 200 increases.

[0035] In this embodiment, a drain pipe 210 connected to the inside of the filter cartridge 200 is provided at a preset height on the side wall of the filter cartridge 200, so that the water level of the sewage in the filter cartridge 200 is maintained at a preset height, thereby preventing the change of the water volume in the filter cartridge 200 from affecting the change of the gravity of the filter cartridge 200; the filter cartridge 200 is suspended above the induction plate 300, and the filter cartridge 200 moves downward to squeeze the telescopic sleeve 220 when the internal impurities increase and the gravity of the filter cartridge 200 increases; specifically, the telescopic sleeve 220 includes a first sleeve rod, a first inner rod and a spring connecting the first sleeve rod and the first inner rod, one end of the first sleeve rod is slidably connected to one end of the first inner rod, the other end of the first sleeve rod is fixed to the shell 100, and the other end of the first inner rod is connected to the filter cartridge 200.

[0036] In this embodiment, the force-enhancing component 410 includes a block 411, a second elastic member and a telescopic top rod 412. The block 411 can be horizontally slidably installed in the shell 100 and is connected to the shell 100 through a second elastic member (not shown in the figure). When the block 411 moves outward, it squeezes the second elastic member. The upper end surface of the block 411 is an inclined surface with a higher inside and a lower outside; the telescopic top rod 412 is vertically arranged, and the upper end of the telescopic top rod 412 is connected to the filter cartridge 200, and the lower end of the telescopic top rod 412 abuts against the inclined surface of the upper end of the block 411. Specifically, the telescopic top rod 412 includes a second set of rods, a second inner rod and a compression spring connecting the second set of rods and the second inner rod. One end of the second set of rods is slidably connected to one end of the second inner rod, and the other end of the second set of rods is fixed to the filter cartridge 200. The other end of the second inner rod abuts against the inclined surface of the upper end of the block 411 under the action of the compression spring. The induction plate 300 is located below the stopper 411 under the impact of the water flow. When the induction plate 300 moves upward, the stopper 411 can be squeezed to move outward or has a tendency to move outward. Specifically, a notch is provided on the induction plate 300 at a position corresponding to the position below the stopper 411, and the upper end of the notch is an arc surface, so as to push the stopper 411 to move outward when the induction plate 300 moves upward, and a push plate 330 is provided at the lower end of the induction plate 300. After the induction plate 300 passes over the stopper 411, the push plate 330 prevents the stopper 411 from extending outward under the action of the second elastic member, so as to prevent the stopper 411 from preventing the induction plate 300 from returning to the bottom of the stopper 411; when the stopper 411 moves outward, the inclined surface at the upper end pushes upward The telescopic push rod 412 is pushed and retracted until the force of the water flow on the induction plate 300 is reduced to a first preset value. After the induction plate 300 passes over the block 411 under the action of the first elastic member 310, it quickly moves upward, and drives the cleaning member 600 to quickly move downward through the transmission assembly 500. If the induction plate 300 moves upward slowly, the cleaning member 600 cleans part of the side wall of the filter cartridge 200, thereby increasing the water flow passing through the filter cartridge 200, causing the induction plate 300 to move downward again, resulting in insufficient cleaning of the side wall of the filter cartridge 200. Therefore, the block 411 is set so that the induction plate 300 moves upward quickly after passing over the block 411, so that the cleaning member 600 quickly and fully cleans the side wall of the filter cartridge 200. As the filter cartridge 200 moves downward, the top pressure of the telescopic top rod 412 on the block 411 increases, and the resistance of the block 411 to the sensing plate 300 increases. Then, when the first preset value is further reduced, that is, the downward force of the water flow on the sensing plate 300 is further reduced, the sensing plate 300 can pass over the block 411 under the action of the first elastic member 310, to avoid the accumulation of impurities in the filter cartridge 200, and the force of the water flow on the sensing plate 300 gradually decreases, resulting in the sensing plate 300 frequently moving upward.

[0037] In this embodiment, the transmission assembly 500 includes a first rack 510, a first gear 520 and a second rack 530. The first rack 510 and the second rack 530 are both vertically arranged, and the first rack 510 is connected to the sensing plate 300, and the second rack 530 is connected to the cleaning member 600. The first gear 520 is rotatably installed in the shell 100 around a horizontal axis and meshes with the first rack 510. When the first rack 510 moves upward with the sensing plate 300, it drives the first gear 520 to rotate, and the first gear 520 drives the second rack 530 to move downward, thereby causing the cleaning member 600 to move downward.

[0038] In this embodiment, the speed regulating assembly 420 includes a third rack 421, a second gear 422, a sliding cylinder 423, a speed regulating wheel 424, a support shaft 425, a transmission belt 426, a transmission wheel 427 and a third gear 428. The support shaft 425 is horizontally and fixedly installed in the housing 100, and the first gear 520 and the second gear 422 are both rotatably installed on the support shaft 425; the third rack 421 is vertically arranged and fixedly connected to the filter cartridge 200, and the second gear 422 is meshed with the third rack 421; the speed regulating wheel 424 can slide axially along the support shaft 425 and rotate synchronously with the first gear 520. Specifically, the speed regulating wheel 4 24 is provided with a first slide groove extending axially along the support shaft 425, and the first gear 520 is provided with a first spline extending axially along the support shaft 425, and the first spline is slidably installed in the first slide groove; the outer circumference of the speed regulating wheel 424 is a conical surface, and the transmission wheel 427 is rotatably installed in the housing 100, and the transmission belt 426 is respectively installed on the speed regulating wheel 424 and the transmission wheel 427, and a baffle that prevents the transmission belt 426 from moving axially along the support shaft 425 with the speed regulating wheel 424 is provided in the housing 100, and the speed regulating wheel 424 rotates with the first gear 520 and drives the transmission wheel 427 to rotate through the transmission belt 426; the transmission wheel 427 and the third The gear 428 is coaxial and fixedly connected, and the third gear 428 is meshed with the second rack 530; the sliding cylinder 423 is threadedly matched with the support shaft 425, and the sliding cylinder 423 rotates synchronously with the second gear 422 and can slide axially along the support shaft 425 relative to the second gear 422. Specifically, a second spline extending axially along the support shaft 425 is provided in the sliding cylinder 423, and a second slide groove extending axially along the support shaft 425 is provided in the second gear 422, and the second spline is slidably installed in the second slide groove; the sliding cylinder 423 and the speed regulating wheel 424 can rotate relatively and move axially along the support shaft 425 synchronously. Specifically, the sliding cylinder 423 23 is provided with an annular protrusion, and an annular groove is provided on the outside of the speed regulating wheel 424, and the annular protrusion is rotatably installed in the annular groove; when the third rack 421 moves downward with the filter cartridge 200, it drives the second gear 422 to rotate, and the sliding cylinder 423 rotates synchronously with the second gear 422 and pushes the speed regulating wheel 424 to move toward the large end of the outer circumferential cone surface of the speed regulating wheel 424 under the cooperation with the thread of the support shaft 425, and then when the induction plate 300 moves upward by the same displacement, the number of circles rotated by the transmission wheel 427 and the third gear 428 is reduced, thereby reducing the displacement of the cleaning member 600 moving downward, thereby preventing the cleaning member 600 from cleaning to the position where impurities accumulate.

[0039] In this embodiment, the cleaning member 600 includes a scraper 610 and a connecting rod 620. The connecting rod 620 can slide up and down through the filter cartridge 200 and is fixedly connected to the second rack 530. The scraper 610 is in contact with the inner wall of the filter cartridge 200. The scraper 610 is connected to the connecting rod 620 and pushes impurities on the filter cartridge 200 to the bottom of the filter cartridge 200 when moving downward with the connecting rod 620.

[0040] In this embodiment, the speed regulating assembly 420 further includes a tensioning column 429, which is an elastic and retractable structure and always tightens the transmission belt 426. Specifically, the tensioning column 429 includes a third set of rods, a third inner rod, and a spring connecting the third set of rods and the third inner rod, one end of the third set of rods is slidably connected to one end of the third inner rod, the other end of the third set of rods is fixed to the housing 100, and the other end of the third inner rod is an arc surface, and under the action of the spring, the transmission belt 426 is tightened to keep the transmission belt 426 taut.

[0041] In this embodiment, a water storage barrel 110 is provided in the shell 100, and the water storage barrel 110 and the filter cartridge 200 are fixedly connected by a drain pipe 210 so that the water storage barrel 110 moves up and down synchronously with the filter cartridge 200, and a telescopic sleeve 220 is provided between the water storage barrel 110 and the shell 100, and the telescopic sleeve 220 is squeezed when the water storage barrel 110 and the filter cartridge 200 move downward; the interior of the water storage barrel 110 is connected with the interior of the filter cartridge 200 through the drain pipe 210, and a drain port 111 is provided at a preset height of the water storage barrel 110, so that the water level of the sewage in the filter cartridge 200 is maintained at a preset height.

[0042] When a sewage filtering device of the present invention is in use, sewage enters the filter cartridge 200 from the water inlet pipe 120, flows out after being filtered by the side wall of the filter cartridge 200 and impacts the induction plate 300 to move downward to abut against the support cylinder 320, and the sewage continues to enter the filter cartridge 200, and the water flow in the filter cartridge 200 that is higher than a preset height enters the water storage barrel 110 through the drain pipe 210, and is discharged from the drain port 111 after the water level in the water storage barrel 110 reaches a preset height, thereby stabilizing the water level in the filter cartridge 200 at the preset height, thereby preventing the change in the amount of water in the filter cartridge 200 from affecting the gravity of the filter cartridge 200.

[0043] As the side wall of the filter cartridge 200 is clogged by impurities, the water flow discharged from the filter cartridge 200 decreases, and the impact force on the induction plate 300 decreases. The induction plate 300 has a tendency to move upward under the action of the first elastic member 310, and the stopper 411 blocks the induction plate 300 from moving upward until the force of the water flow on the induction plate 300 decreases to a first preset value. The induction plate 300 overcomes the impact force of the water flow and the resistance of the stopper 411 under the action of the first elastic member 310. After the induction plate 300 passes over the stopper 411, it moves upward rapidly under the action of the first elastic member 310, driving the first elastic member 310 to move upward. A rack 510 moves upward, the first rack 510 drives the first gear 520 to rotate, the first gear 520 drives the speed regulating wheel 424 to rotate synchronously, the speed regulating wheel 424 drives the transmission wheel 427 to rotate through the transmission belt 426, the third gear 428 rotates synchronously with the transmission wheel 427 and enables the second rack 530 to drive the cleaning member 600 to move downward, the cleaning member 600 moves downward to push the impurities blocked on the side wall of the filter cartridge 200 to the bottom of the filter cartridge 200, thereby increasing the water flow discharged from the filter cartridge 200 again, and pushing the induction plate 300 downward to abut against the support cylinder 320.

[0044] As the impurities in the filter cartridge 200 increase, the weight of the filter cartridge 200 increases and moves downward to squeeze the telescopic sleeve rod 220. As the filter cartridge 200 moves downward, the telescopic top rod 412 increases the top pressure of the stopper 411, and the resistance of the stopper 411 to the sensing plate 300 increases. Then, when the first preset value is further reduced, that is, the downward force of the water flow on the sensing plate 300 is further reduced, the sensing plate 300 can pass over the stopper 411 under the action of the first elastic member 310 to avoid the accumulation of impurities in the filter cartridge 200, and the force of the water flow on the sensing plate 300 gradually decreases, resulting in the sensing plate 300 moving upward frequently. When the third rack 421 moves downward with the filter cartridge 200, it drives the second gear 422 to rotate, and the sliding cylinder 423 rotates synchronously with the second gear 422 and pushes the speed regulating wheel 424 to move toward the large end of the outer circumferential cone surface of the speed regulating wheel 424 under the cooperation with the thread of the support shaft 425. Therefore, when the induction plate 300 moves upward by the same displacement, the number of revolutions of the transmission wheel 427 and the third gear 428 is reduced, thereby reducing the downward displacement of the cleaning member 600, thereby preventing the cleaning member 600 from cleaning to the position where impurities accumulate.

[0045] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sewage filtering device, characterized in that: The invention comprises a shell, a filter cartridge, an induction plate, an adjusting mechanism, a transmission assembly and a cleaning member; the filter cartridge and the induction plate can be slidably installed in the shell up and down, and the induction plate is located below the filter cartridge, and the sewage flows out after being filtered by the side wall of the filter cartridge and impacts the induction plate to move the induction plate downward, and the water level of the sewage in the filter cartridge is constant; a first elastic member is arranged between the induction plate and the shell, and the first elastic member is squeezed when the induction plate moves downward, and the first elastic member prompts the induction plate to move upward when the force of the water flow on the induction plate is reduced to a first preset value; the cleaning member is attached to the inner wall of the filter cartridge and pushes the blockage on the side wall of the filter cartridge to the bottom of the filter cartridge when it moves downward; when the induction plate moves upward, the cleaning member is driven downward by the transmission assembly, and when it moves downward, the cleaning member is driven upward by the transmission assembly; the adjusting mechanism comprises a force-increasing member and a speed-regulating member, the force-increasing member makes the first preset value decrease as the impurities in the filter cartridge increase, and the speed-regulating member makes the displacement of the cleaning member moving downward decrease as the impurities in the filter cartridge increase.

2. A sewage filtering device according to claim 1, characterized in that: A drainage pipe connected to the inside of the filter cartridge is provided at a preset height on the side wall of the filter cartridge, thereby keeping the water level of the sewage in the filter cartridge at a preset height; the filter cartridge is suspended above the induction plate, and when the internal impurities increase and the gravity of the filter cartridge increases, the filter cartridge moves downward to squeeze the telescopic sleeve.

3. A sewage filtering device according to claim 2, characterized in that: The force-increasing component includes a block, a second elastic member and a telescopic push rod, the block can be horizontally slidably installed in the shell and is connected to the shell through the second elastic member. When the block moves outward, the second elastic member is squeezed, and the upper end surface of the block is an inclined surface with a high inner side and a low outer side; the telescopic push rod is vertically arranged, the upper end of the telescopic push rod is connected to the filter cartridge, and the lower end of the telescopic push rod abuts against the inclined surface of the upper end of the block. When the induction plate moves upward, the block can be squeezed to move outward or has a tendency to move outward. When the block moves outward, the inclined surface of the upper end pushes the telescopic push rod upward; until the force of the water flow on the induction plate is reduced to a first preset value, the induction plate continues to move upward after passing over the block under the action of the first elastic member; as the filter cartridge moves downward, the top pressure of the telescopic push rod on the block increases, and the resistance of the block to the induction plate increases, and then when the first preset value is further reduced, the induction plate can pass over the block under the action of the first elastic member.

4. A sewage filtering device according to claim 3, characterized in that: A notch is provided on the sensing plate at a position below the corresponding stopper, and the upper end of the notch is an arc surface, so as to push the stopper to move outward when the sensing plate moves upward, and a push plate is provided at the lower end of the sensing plate. After the sensing plate passes over the stopper, the push plate prevents the stopper from extending out under the action of the second elastic member, so as to prevent the stopper from hindering the sensing plate from returning to under the stopper.

5. A sewage filtering device according to claim 3, characterized in that: The transmission assembly includes a first rack, a first gear and a second rack. The first rack and the second rack are both vertically arranged, and the first rack is connected to the induction plate, and the second rack is connected to the cleaning member. The first gear is installed in the shell and rotates around a horizontal axis and meshes with the first rack. When the first rack moves upward with the induction plate, it drives the first gear to rotate, and the first gear drives the second rack to move downward, thereby causing the cleaning member to move downward.

6. A sewage filtering device according to claim 5, characterized in that: The speed regulating assembly includes a third rack, a second gear, a sliding cylinder, a speed regulating wheel, a support shaft, a transmission belt, a transmission wheel and a third gear. The support shaft is horizontal and fixedly installed in the housing, and the first gear and the second gear are both rotatably installed on the support shaft; the third rack is vertically arranged and fixedly connected to the filter cartridge, and the second gear is meshed with the third rack; the speed regulating wheel can slide axially along the support shaft and rotate synchronously with the first gear, the outer circumference of the speed regulating wheel is a conical surface, the transmission wheel is rotatably installed in the housing, and the transmission belt is respectively installed on the speed regulating wheel and the transmission wheel, and the speed regulating wheel rotates with the first gear and drives the transmission wheel to rotate through the transmission belt; The transmission wheel is coaxial with the third gear and fixedly connected, and the third gear is meshed with the second rack; the sliding cylinder is threadedly matched with the support shaft, and the sliding cylinder and the second gear rotate synchronously and can slide axially along the support shaft relative to the second gear, the sliding cylinder and the speed regulating wheel can rotate relatively and move axially along the support shaft synchronously, and the third rack drives the second gear to rotate when the filter cylinder moves downward, the sliding cylinder rotates synchronously with the second gear and pushes the speed regulating wheel to move toward the large end of the outer circumferential cone surface of the speed regulating wheel in cooperation with the thread of the support shaft, so that when the induction plate moves upward by the same displacement, the downward displacement of the cleaning part is reduced.

7. A sewage filtering device according to claim 5, characterized in that: The cleaning part includes a scraper and a connecting rod. The connecting rod can slide up and down through the filter cartridge and is fixedly connected to the second rack. The scraper fits the inner wall of the filter cartridge and is connected to the connecting rod. When moving downward with the connecting rod, the scraper pushes the impurities on the filter cartridge to the bottom of the filter cartridge.

8. A sewage filtering device according to claim 6, characterized in that: The speed regulating assembly also includes a tensioning column, which is an elastic and retractable structure and always tightens the transmission belt.

9. A sewage filtering device according to claim 1, characterized in that: A water storage barrel is arranged in the shell, and the water storage barrel is connected to the filter cartridge through a drain pipe, and the water storage barrel and the filter cartridge are communicated through the drain pipe; a telescopic sleeve is arranged between the water storage barrel and the shell, and the telescopic sleeve is squeezed when the water storage barrel and the filter cartridge move downward; a drain outlet is arranged at a preset height of the water storage barrel, so that the water level of the sewage in the filter cartridge is maintained at a preset height.

10. A sewage filtering device according to claim 2, characterized in that: The telescopic sleeve includes a first sleeve rod, a first inner rod and a spring connecting the first sleeve rod and the first inner rod. One end of the first sleeve rod is slidably connected to one end of the first inner rod. The other end of the first sleeve rod is fixed to the shell. The other end of the first inner rod is connected to the filter cartridge.

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