CN111085043B

CN111085043B - Preliminary filtering equipment and method for solid impurities in sewage

Info

Publication number: CN111085043B
Application number: CN201911345863.1A
Authority: CN
Inventors: 徐婧; 刘珍; 范一鸣; 田磊
Original assignee: Bozhou Vocational and Technical College
Current assignee: Bozhou Vocational and Technical College
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2021-09-21
Anticipated expiration: 2039-12-24
Also published as: CN111085043A

Abstract

The invention relates to a preliminary filtering device and a preliminary filtering method for solid impurities in sewage, belonging to the technical field of sewage treatment equipment, wherein the device comprises a liquid tank and a sedimentation tank communicated with the liquid tank, and a rotating shaft is arranged above the liquid tank; the rotating shaft is provided with a filtering grid plate, and the periphery of the rotating shaft is provided with a rotating drum; the side wall of the rotary drum is provided with an annular hole arranged along the circumferential direction of the rotary drum; the filtering grid plate is provided with filtering holes, and the side part of the filtering grid plate is provided with a guide inclined plane; the lateral part of the liquid pool is provided with a scraping mechanism which extends to the position of the filtering grid plate along the corresponding annular hole. The invention utilizes the scraping mechanism to extrude the impurities adhered to the surface into a lump state, pushes the lump state to the vicinity of the discharge channel, and finally enters the sedimentation tank for sedimentation, thereby realizing systematic and efficient treatment of the impurities, improving the water quality purification capacity, being particularly suitable for the traditional sewage discharge industries with larger water consumption, such as textile industry, papermaking industry and the like, and playing an important role in saving water resources and promoting the cyclic utilization of the water resources.

Description

Preliminary filtering equipment and method for solid impurities in sewage

Technical Field

The invention relates to the technical field of sewage treatment equipment, in particular to preliminary filtration equipment and a preliminary filtration method for solid impurities in sewage.

Background

Industrial waste water discharges and is always the important source that water pollution produced, along with people's attention to environmental protection, and many industrial and mining enterprises have all adopted sewage waste water clean filtration equipment to carry out standard nature processing, later discharge to quality of water at present. In a plurality of industries, the fields of paper making and textile belong to the key field of industrial wastewater discharge, regarding the treatment of wastewater, taking the paper making industry as an example, the paper making industry in China mostly adopts straw, wood pulp and the like as paper making raw materials at present, and the pulp making and paper making production generally comprises the procedures of pulp making, pulp washing, bleaching and paper making; the pulping in the paper making industry comprises alkaline pulping, chemimechanical pulping and mechanical pulping, the generation and discharge of pollutants of the waste water are greatly different according to different pulping methods, different raw materials, different pulping yields, different paper making varieties and the recovery of chemicals, but the waste water basically contains a large amount of suspended matters, BOD, COD and partial toxic substances and is treated by adopting a mode of combining a physicochemical method and a biological method, wherein the physicochemical method can reduce the pressure of the biological method for treatment, is beneficial to obviously removing impurities in water and has important significance.

In equipment for sewage treatment, a patent named as sewage multistage filtering equipment exists, the application number of the patent is 2017114940463, the publication date is 2018, 5 and 8 days, and the patent comprises a frame body, a rubber plug, a water outlet pipe, a first valve, a first screen plate, sand, a first sealing bearing, an installation plate, a motor, a first rotating shaft, blades, a feed hopper and the like; the lower part of the right wall of the frame body is provided with a discharge hole, a rubber plug is plugged in the discharge hole, the lower part of the left wall of the frame body is provided with a water outlet pipe, the water outlet pipe is provided with a first valve, the lower part of the frame body is provided with a first screen plate, and sand is placed in the frame body at the lower part of the first screen plate. This patent is in the same direction as the contrary rotation through first pivot, drives the blade and is in the same direction as the contrary rotation, lets the better that sewage and coagulant mix, can filter sewage once more through the second otter board for sewage filterable is more comprehensive. The technical scheme has the following problems: the blade only plays the effect of stirring, and the purification of water still mainly relies on otter board and sand to filter, and when aquatic impurity is more, otter board and the fine and close sand in clearance are blockked up by impurity easily, lead to the filtration inefficiency afterwards.

The other patent is named as wastewater filtering equipment for chemical fiber cloth processing, the application number of the wastewater filtering equipment is 2017110148367, and the publication date is 2018, 4 and 24 days; in order to solve the problem that the discharge pipe is easy to block during output, the technical scheme is disclosed, which specifically comprises a working box, a bottom plate and four groups of brackets, wherein a filter screen is arranged at the input end of the discharge pipe, and a filter device is arranged in the working cavity; the device also comprises a handle, a rotating rod, a driving column, a scraping plate and a sealing ring; the scraper box also comprises a push plate, a push rod, a connecting plate and a scraper, wherein a through hole is formed in the left side wall of the working box, and a side ball bearing is arranged in the through hole; the four-group support is characterized by further comprising a support plate, electric cylinders and telescopic rods, wherein the bottom ends of the four groups of supports are provided with idler wheels, the top end of the support plate is provided with a placing groove, and a lower ball bearing is arranged inside the placing groove. When the filter screen scraping device is used, the handle is rotated to drive the scraper on the driving column to scrape the filter screen at the output end of the discharge pipe, so that the filter screen is not easy to block, and the use reliability of the filter screen scraping device is improved. However, the manual scraping can not improve the operation efficiency of the equipment obviously, the scraped impurities still remain in the equipment, the state of the impurities is not changed fundamentally, and the impurities are easy to be raised in the liquid and form blockage again.

There is also a patent entitled sewage discharge filtration apparatus for paper mill, which has application numbers: 2018104444067, publication date 8/3/2018; including casing and slide bar, casing left side front end fixedly connected with motor cabinet, motor cabinet side fixedly connected with motor spindle, motor spindle output fixedly connected with cam, cam side fixedly connected with transfer line, through first through-hole and the second through-hole that sets up, when first through-hole moves under the water pipe internal diameter, sewage is filtered the flow direction casing outside through the filter layer through the water pipe this moment, and the second through-hole is located the filter layer upper end, store filterable precipitate in second through-hole department, when the skew water pipe internal diameter of first through-hole, sewage is by first baffle separation, the second baffle is located the accumulator upper end this moment, the precipitate that will store is through first guide rail friction removal to the accumulator, increase the filter effect, reduce the precipitate discharge. This scheme is through the position that changes the baffle, realizes separation and the filtration to the impurity in the sewage, but its realization will rely on impurity to have great proportion with aqueous phase ratio, and easily separates from the aquatic, otherwise then can lead to impurity to mix and be difficult for forming the sediment in the aquatic and then fall into the accumulator.

In order to solve the problem of separation and precipitation of impurities in sewage, particularly sewage containing fibrous impurities in water bodies such as textiles and papermaking, people need a more practical and efficient filtering scheme.

Disclosure of Invention

1. Problems to be solved

Aiming at the technical problem that solid impurities in sewage are not easy to filter in the prior art, the invention provides equipment and a method for primarily filtering the solid impurities in the sewage.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A primary filtering device for solid impurities in sewage comprises a liquid pool and a sedimentation pool communicated with the liquid pool, wherein a rotating shaft is arranged above the liquid pool; the rotating shaft is provided with a filtering grid plate, and the periphery of the rotating shaft is provided with a rotating drum; the side wall of the rotary drum is provided with an annular hole arranged along the circumferential direction of the rotary drum; the filtering grid plate is provided with filtering holes, and the side part of the filtering grid plate is provided with a guide inclined plane; the side part of the liquid pool is provided with a scraping mechanism which extends to the position of the filtering grid plate along the corresponding annular hole; the scraping mechanism comprises a push rod and a primary spring for driving the push rod to reset, and a sub-guide rod is movably inserted into the push rod along the length direction of the push rod; and a scraper movably matched with the filtering grid plate is arranged on the sub-guide rod, and a secondary spring for driving the scraper to reset is arranged between the scraper and the push rod.

Preferably, the scraping mechanism comprises a female guide bar; one end of the female guide rod is movably inserted into the push rod, and the other end of the female guide rod is supported by the liquid pool.

Preferably, a connecting plate is arranged between the female guide rod and the liquid pool; the upper part of the connecting plate inclines towards the rotating shaft, and the lower part of the connecting plate is provided with a pipeline leading to the sedimentation tank.

Preferably, a water pump is installed at the sedimentation tank; the water pump pumps the water in the sedimentation tank to the liquid tank through a water pipe.

Preferably, the upper part of the connecting plate is provided with a flow guide cover extending into the rotary drum, and the flow guide cover is positioned above the scraping mechanism.

Preferably, the smallest width of the pod is the same as the width of the annular aperture.

Preferably, the side part of the filtering grid plate is provided with a convex part; the guide inclined plane is arranged on the contact surface of the protruding part and the scraper and used for pushing the scraper away from the filtering grid plate.

Preferably, the inner wall of the liquid pool is provided with a fork-shaped structure extending into the rotary drum, and the fork-shaped structure is positioned between two adjacent filtering grid plates and positioned on one side of the filtering grid plate rotating into the water body.

Preferably, a thorn structure is arranged on the fork-shaped structure.

A use method of a primary filtering device for solid impurities in sewage comprises the following steps:

s1, water injection: injecting a water body into the liquid pool, and adding a proper amount of coagulant and flocculant into the water body to enable the liquid level of the water body to reach the rotating shaft;

s2, crushing impurities: rotating the rotating shaft to drive the filtering grid plate and the rotating drum to rotate together, and crushing large-volume impurities in the water into small-volume impurities by the filtering grid plate under the action of the matched shearing and tearing of the fork-shaped structure;

s3, filtering impurities: along with the rotation of the filtering grid plate, the water body escapes through the filtering holes, and small-volume impurities in the water body are stacked and attached to the filtering grid plate;

s4, compacting impurities: when the filtering grid plate rotates to the scraping mechanism, the scraper blade scrapes from one end of the filtering grid plate to the other end, the secondary spring is compressed, the scraper blade is pushed to one side of the filtering grid plate by the guide inclined plane, and in the process, the scraper blade laminates impurities attached to the filtering grid plate into a compact block shape and scrapes the impurities;

s5, collecting impurities: the force component of the filtering grid plate on the scraper plate enables the scraper plate and the push rod to contract along the female guide rod, the primary spring is compressed until the scraper plate is separated from the filtering grid plate, and the filtering grid plate pulls the compacted impurity blocks back to the connecting plate along the flow guide cover;

s6, precipitation: impurities pressed into compact blocks flow to a sedimentation tank along an inclined connecting plate for sedimentation, filtered water on the upper layer of the sedimentation tank is pumped by a water pump and enters a liquid pool again for filtration, and the water is guided to a rotary drum to wash the rotary drum, a filtration grid plate and a scraping mechanism during pumping;

s7, mesh pressing and precipitating: and the net structure is adopted to cover the impurity sediments at the bottom of the sedimentation tank in time, so that the sediments are prevented from rising, and the sediments are intensively taken out after a certain amount of water is completely filtered.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention adopts the shearing and matching action of the fork-shaped structure and the filtering grid plate to primarily crush solid impurities, then utilizes the filtering grid plate to concentrate fine impurities generated by crushing on the surface of the filtering grid plate, utilizes the scraping mechanism to extrude the impurities adhered on the surface into a block state, pushes the block state to the vicinity of a discharge channel, and finally enters a sedimentation tank for sedimentation, thereby realizing the systematic high-efficiency treatment of the impurities, avoiding various defects generated by filtering equipment and methods adopted in the prior art, improving the water quality purification capacity, being particularly suitable for the traditional sewage discharge industries with larger water consumption, such as textile, papermaking and the like, and playing important roles in saving water resources and promoting the cyclic utilization of the water resources.

(2) The invention adopts a two-stage type telescopic structure, namely the scraper plate realizes radial movement relative to the push rod under the pushing action of the two-stage spring, and the push rod realizes axial sliding relative to the connecting plate under the control action of the one-stage spring, namely the scraper plate integrally realizes the movement of the scraper plate in a two-dimensional space or even a three-dimensional space, thereby ensuring the flexible scraping of the scraper plate on impurities on the filtering grid plate, and simultaneously, the directional pushing of the impurities is attached, thus being beneficial to realizing the efficient removal of the impurities.

(3) The invention adopts the guide cover with the arc structure and the inclined connecting plate to guide the impurity blocks pushed by the scraper into the impurity discharge channel, which is beneficial to preventing the impurities from returning to the liquid pool and being flapped and torn by the filtering grid plate again, so as to improve the impurity filtering efficiency and form the body systematized impurity treatment effect.

(4) According to the invention, the filtering grid plate with the filtering holes is adopted to simulate the filtering net, and the filtering grid plate has higher strength compared with a common filtering net, so that on one hand, the filtering grid plate can bear repeated scraping of the scraping plate and larger shearing force generated when the filtering grid plate is matched with a fork-shaped structure, and the running stability of equipment is ensured; on the other hand, through improving the rotating speed of the filtering grid plate, when impurities blocked in the filtering holes are removed by means of the impact force of water on the filtering grid plate, the filtering grid plate cannot be easily deformed, and the scraper can be fully and effectively contacted with the surface of the filtering grid plate.

(5) The contact position of the scraper and the filtering grid plate is positioned on one side of the filtering grid plate, which is turned out of the water surface, and impurities are easy to adhere to the side surface; the position of the matched position of the filtering grid plate and the fork-shaped structure is positioned on one side of the filtering grid plate entering the water surface, the filtering grid plate is easy to hit and smash impurities floating on the water surface by utilizing the inertia impact force of the filtering grid plate at the position, and the best implementation effect is achieved.

Drawings

FIG. 1 is a perspective view of a preliminary filtering apparatus for solid impurities in sewage according to the present invention;

FIG. 2 is a top view of the preliminary filtering apparatus for solid impurities in contaminated water according to the present invention;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a perspective cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is an enlarged view of C in FIG. 4;

FIG. 6 is a front view of the preliminary filtering apparatus for solid impurities in sewage according to the present invention;

fig. 7 is a cross-sectional view taken along line D-D of fig. 6.

In the figure:

1. a liquid pool; 101. a forked structure;

2. a rotating shaft;

3. filtering the grid plate; 301. filtering holes; 302. a boss portion; 3021. a bevel;

4. a scraping mechanism; 401. a push rod; 402. a primary spring; 403. a sub-guide bar; 404. a squeegee; 405. a secondary spring; 406. a female guide bar;

5. a rotating drum; 501. an annular aperture;

6. connecting plates; 601. a pod;

7. a pipeline; 8. a sedimentation tank; 9. a water pump; 10. a water pipe.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the embodiment.

As shown in fig. 1 to 7, a preliminary filtering device for solid impurities in sewage comprises a liquid tank 1 and a sedimentation tank 8 communicated with the liquid tank 1, wherein the liquid tank 1 and the sedimentation tank 8 are both constructed by reinforced concrete, and a rotating shaft 2 made of ferroalloy is arranged above the liquid tank 1; the rotating shaft 2 is horizontally arranged above the liquid pool 1 in the transverse direction, two shaft ends are respectively supported by two opposite side walls of the liquid pool 1, and in order to prevent the rotating shaft 2 from shaking, the two shaft ends of the rotating shaft 2 are respectively and correspondingly built on the two side walls.

One end of the filtering grid plate 3 is inserted on the rotating shaft 2 in an interference fit mode, and a circular rotating drum 5 is fixedly arranged on the periphery of the rotating shaft 2; the rotary drum 5 is made of metal and is fixed in the liquid pool 1 by a vertical metal upright post, one end of the metal upright post is built in the liquid pool 1, and the other end of the metal upright post is welded with the rotary drum 5. The side wall of the rotary drum 5 is provided with an annular hole 501 arranged along the circumferential direction of the rotary drum 5; when the filter screen plate is used, one end of the rotating shaft 2 is connected with a motor in a belt transmission mode, the rotating shaft 2 is driven by the motor to rotate, and the filtering screen plate 3 is driven by the rotating shaft 2.

In order to break up the bulky or massive impurities in the liquid pool 1 so as to facilitate the netting operation of the filtering grid plates 3, the inner wall of the liquid pool 1 is provided with a fork-shaped structure 101 extending into the rotary drum 5, the fork-shaped structure 101 is positioned on one side far away from the sedimentation tank, the eight fork-shaped structures 101 in the embodiment are respectively and correspondingly positioned between two adjacent filtering grid plates 3 to form a staggered distribution arrangement form, and the upper surface of the fork-shaped structure 101 is provided with a conical thorn structure. When the filtering grid plate 3 is used, when the filtering grid plate 3 is driven into water, the impurities of the large block are cut and cracked under the matching of the fork-shaped structure 101 to form a crushing state, so that the filtering grid plate 3 is convenient to net catch, and the thorn structure can accelerate crushing. The so-called screen capturing is that the impurities crushed by the filter grid 3 cannot pass through the filter grid 3 along with the water flow, and are accumulated only at the striking surface of the filter grid 3, specifically, at the openings of the filter holes 301 of the filter grid 3, to gradually form an accumulation layer.

The filtering grid plate 3 is provided with filtering holes 301 for draining water, the side surface of one end of the filtering grid plate 3 away from the rotating shaft 2 is provided with a convex part 302, and the side surface is the side surface of the filtering grid plate 3 which is hit on the water surface; a guide slope 3021 is formed on one end surface of the boss 302 near the rotating shaft 2.

The side part of the liquid pool 1 is provided with a scraping mechanism 4 extending to the position of the filtering grid plate 3 along the corresponding annular hole 501, and the scraping mechanism 4 cannot generate movement interference with the rotary drum 5 due to the arrangement of the annular hole 501; the scraping mechanism 4 comprises a female guide rod 406, a push rod 401 and a primary spring 402 for driving the push rod 401 to reset; one end of the female guide rod 406 is supported by the liquid pool 1, and the other end of the female guide rod 406 is movably inserted into the push rod 401; a sub-guide rod 403 is movably inserted into the other end of the push rod 401 along the length direction of the push rod 401; the sub-guide rod 403 is provided with a scraper 404, the scraper 404 is movably matched with the filtering grid plate 3, and the scraper 404 extends from one side of the guide inclined plane 3021, which is further away from the rotating shaft 2, to the corresponding filtering grid plate 3 to scrape impurities on the filtering grid plate 3. A secondary spring 405 for driving the scraper 404 to reset is arranged between the scraper 404 and the push rod 401; a guide slope 3021 is provided on a contact surface of the protrusion 302 with the blade 404, and the guide slope 3021 is used to push the blade 404 away from the filter grid 3 in the axial direction of the rotation shaft 2. The specific action process of the part of mechanism in use is as follows: (1) overall action, because the scraper 404 is in a normal state and even at the rotating shaft 2, when the filtering grid 3 rotates to the scraping mechanism 4, the scraper 404 scrapes from one end of the filtering grid 3 close to the rotating shaft 2 to the other end, in the process, the filtering grid 3 pushes the scraper 404 away from the rotating shaft 2, namely, the secondary spring 405 is compressed until the scraper 404 is laterally pushed to one side of the filtering grid 3 by the inclined guide slope 3021; at this stage, the scraper 404 laminates impurities attached to the filter grid 3 into a compact block and scrapes off; (2) local action, in the whole action process, local action goes on simultaneously, specifically: the component force of the guiding inclined surface 3021 on the filtering grid plate 3 to the scraping plate 404 along the axial direction of the rotating shaft 2 causes the scraping plate 404 together with the push rod 401 to contract along the female guide rod 406, at this time, the primary spring 402 is compressed until the scraping plate 404 is separated from the filtering grid plate 3; at the moment, the filter grid plate 3 pulls the compacted impurity blocks with higher density back to the connecting plate 6 along the air guide sleeve 601; the agglomerates do not float in the water after being collected, but instead aggregate to precipitate due to increased density.

By adopting the two-stage type telescopic structure, namely, the scraper plate can realize radial movement relative to the push rod 401 under the pushing action of the second-stage spring 405, and the push rod 401 can realize axial sliding relative to the female guide rod 406 under the control action of the first-stage spring 402, so that the movement of the scraper plate 404 in a two-dimensional space (the push rod 401 is a straight rod) or even in a three-dimensional space (the push rod 401 is a curved rod) is integrally realized, the flexible scraping of the impurity on the filtering grid plate 3 by the scraper plate 404 is ensured, meanwhile, the directional pushing of the impurity is carried out, the impurity is uniformly pushed to a specific area, and the efficient concentrated clearing of the impurity is facilitated.

The skilled person can use different materials and sizes to manufacture the above components according to specific needs, and the purpose is to achieve the above operation process and achieve the technical purpose. In this embodiment, the first-stage spring 402 is a 304 stainless steel spring with a wire diameter of 1mm, an outer diameter of 12mm and a length of 18 cm. The secondary spring 405 is a 304 stainless steel spring with a wire diameter of 0.4mm, an outer diameter of 12mm and a length of 5 cm. All the other materials which are not emphasized are made of stainless steel.

In order to further improve the flowing trend of impurities along a specific direction, a connecting plate 6 is arranged between the female guide rod 406 and the liquid pool 1; the upper part of the connecting plate 6 inclines towards the rotating shaft 2, the lower part of the connecting plate 6 is provided with a pipeline 7 leading to the sedimentation tank 8, and water flow brings impurities to the pipeline 7 along the inclined connecting plate 6. Furthermore, the technical scheme is that eight guide hoods 601 which respectively correspond to eight annular holes 501 extending into the rotary drum 5 are arranged at the upper part of the connecting plate 6, the minimum width of each guide hood 601 is the same as the width of each annular hole 501 and is 12cm, so that the fluid is guided to move more fully, and the guide hoods 601 are positioned above the scraping mechanism 4, so that the function of guiding impurities in the rotary drum 5 to the connecting plate 6 is realized, and the impurities are driven to flow to the pipeline 7.

In order to prevent to precipitate and raise, in the bottom of liquid pool 1, be close to the network structure that one side of even board 6 set up adhesion impurity block piece, specifically be aperture 1 cm's iron net, the outside limit of this network structure adopts the magnet to adsorb the round, utilizes the gravity of magnet to further press the network structure in 1 bottom of liquid pool, can drag for out when waiting to clear up and wash.

According to the technical scheme, a water pump 9 is arranged at a sedimentation tank 8; the brand of the water pump 9 is GLORY, and the water pump is a 250-watt electric stainless steel centrifugal pump. Water in the sedimentation tank 8 is pumped to the liquid pool 1 through the water pipe 10, the inner wall of the rotary drum 5 and the filtering grid plate 3 are washed, and impurities are prevented from being adhered to the equipment and affecting normal filtering and running of the equipment.

s1, water injection: injecting water into the liquid pool 1 to enable the liquid level of the water to reach the rotating shaft 2, and adding a proper amount of coagulant or flocculant into the water to improve the adhesion of impurities and facilitate the concentration of the impurities;

s2, crushing impurities: the rotating shaft 2 is rotated, so that the rotating shaft 2 drives the filtering grid plate 3 and the rotating drum 5 to rotate together, and the filtering grid plate 3 breaks large-volume impurities in water into small-volume impurities under the action of the matched shearing and tearing of the fork-shaped structure 101;

s3, filtering impurities: along with the rotation of the filtering grid plate 3, the water body escapes through the filtering holes 301, and small-volume impurities in the water body are stacked and attached to the filtering grid plate 3;

s4, compacting impurities: when the filtering grid plate 3 rotates to the scraping mechanism 4, the scraping plate 404 scrapes from one end to the other end of the filtering grid plate 3, the secondary spring 405 is compressed, the scraping plate 404 is pushed to one side of the filtering grid plate 3 by the guide inclined plane 3021, and in the process, the scraping plate 404 laminates impurities attached to the filtering grid plate 3 into a compact block shape and scrapes the impurities;

s5, collecting impurities: the force component of the filtering grid plate 3 to the scraper 404 causes the scraper 404 together with the push rod 401 to contract along the female guide rod 406, the primary spring 402 is compressed until the scraper 404 is separated from the filtering grid plate 3, and at the moment, the filtering grid plate 3 pulls the compacted impurity blocks back to the connecting plate 6 along the diversion cover 601;

s6, precipitation: impurities pressed into compact blocks flow to a sedimentation tank 8 along an inclined connecting plate 6 for sedimentation, filtered water on the upper layer of the sedimentation tank 8 is pumped by a water pump 9 and enters the liquid pool 1 again for filtration, and the water is guided to the rotary drum 5 during pumping, so that the rotary drum 5, the filtering grid plate 3 and the scraping mechanism 4 are washed;

s7, mesh pressing and precipitating: and the net structure is adopted to cover the impurity sediments at the bottom of the sedimentation tank 8 in time, so that the sediments are prevented from rising, and the sediments are intensively taken out after a certain amount of water is completely filtered.

In this patent, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which shall fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A primary filtering device for solid impurities in sewage comprises a liquid pool (1) and a sedimentation tank (8) communicated with the liquid pool (1), wherein a rotating shaft (2) is arranged above the liquid pool (1); the method is characterized in that:

the rotating shaft (2) is provided with a filtering grid plate (3), and the periphery of the rotating shaft (2) is provided with a rotating drum (5); the side wall of the rotary drum (5) is provided with an annular hole (501) arranged along the circumferential direction of the rotary drum (5);

the filtering grid plate (3) is provided with filtering holes (301), and the side part of the filtering grid plate (3) is provided with a guide inclined plane (3021); the side part of the liquid pool (1) is provided with a scraping mechanism (4) which extends to the position of the filtering grid plate (3) along the corresponding annular hole (501); the scraping mechanism (4) comprises a push rod (401) and a primary spring (402) for driving the push rod (401) to reset, and a sub guide rod (403) is movably inserted into the push rod (401) along the length direction of the push rod (401); a scraper (404) which is movably matched with the filtering grid plate (3) is arranged on the sub guide rod (403), and a secondary spring (405) which drives the scraper (404) to reset is arranged between the scraper (404) and the push rod (401);

the scraping mechanism (4) comprises a female guide rod (406); one end of the female guide rod (406) is movably inserted into the push rod (401), and the other end of the female guide rod (406) is supported by the liquid pool (1);

a connecting plate (6) is arranged between the female guide rod (406) and the liquid tank (1); the upper part of the connecting plate (6) inclines towards the rotating shaft (2), and the lower part of the connecting plate (6) is provided with a pipeline (7) leading to a sedimentation tank (8).

2. The apparatus of claim 1 for preliminary filtering solid impurities in sewage, wherein: a water pump (9) is arranged at the sedimentation tank (8); and the water pump (9) pumps the water body in the sedimentation tank (8) to the liquid tank (1) through a water pipe (10).

3. The apparatus of claim 1 for preliminary filtering solid impurities in sewage, wherein: the upper part of the connecting plate (6) is provided with a flow guide cover (601) extending into the rotary drum (5), and the flow guide cover (601) is positioned above the scraping mechanism (4).

4. The apparatus of claim 3, wherein the apparatus further comprises: the minimum width of the air guide sleeve (601) is the same as the width of the annular hole (501).

5. The apparatus of claim 1 for preliminary filtering solid impurities in sewage, wherein: the side part of the filtering grid plate (3) is provided with a convex part (302); the guide inclined plane (3021) is arranged on the contact surface of the convex part (302) and the scraper (404) and is used for pushing the scraper (404) away from the filtering grid plate (3).

6. The preliminary filtering apparatus for solid impurities in polluted water according to any one of claims 1 to 5, wherein: the inner wall of the liquid pool (1) is provided with a fork-shaped structure (101) extending into the rotary drum (5), the fork-shaped structure (101) is positioned between two adjacent filtering grid plates (3), and is positioned at one side of the filtering grid plates (3) rotating into a water body.

7. The apparatus of claim 6, wherein the apparatus further comprises: the fork-shaped structure (101) is provided with a thorn structure.