Municipal sewage treatment device

Abstract

The invention discloses a municipal sewage treatment device, and relates to the technical field of sewage treatment, the municipal sewage treatment device comprises a treatment tank, and the treatment tank is internally provided with a hollow cylinder coaxially arranged with the treatment tank. By means of the driving assembly, the rotating rod and the sleeve rotate at different speeds in the same direction (the rotating speed of the rotating rod is smaller than that of the sleeve), sewage and a coagulant can be fully homogenized and mixed within a short time in cooperation with high-speed stirring of the first spiral blades with small screw pitches, floc formation is rapidly promoted, and the mixing reaction efficiency is greatly improved; by means of buffer space transition between the first spiral blade and the second spiral blade and the design that the screw pitch of the second spiral blade is gradually increased, the gradient change of the stirring speed from high to low is achieved, it is guaranteed that flocs are stably coagulated and increased, the flocs can be promoted to fully adsorb suspended particles in sewage, and the precipitation performance of the flocs is remarkably improved; all links are smoothly linked, so that the efficient coordination of impurity removal, floc formation and precipitation is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, especially to a municipal sewage treatment device. BACKGROUND

[0002] The sewage treatment method includes physical treatment method, chemical treatment method and biological treatment method. The chemical treatment method is a wastewater treatment method for separating and removing pollutants in dissolved and colloidal state or converting them into harmless substances through chemical reaction and mass transfer. In the chemical treatment method, the treatment unit based on chemical reaction by adding reagents is: coagulation, neutralization, oxidation and reduction, etc. Compared with other physical and chemical methods, the coagulation and sedimentation process has the advantages of good effluent quality, stable and reliable process operation, economy and practicality, simple operation, etc. The coagulation and sedimentation principle is to add some reagents (usually called coagulant and coagulant aid) to the water, so that the particles in the water that are difficult to precipitate can aggregate to form a colloid, and then combine with impurities in the water to form larger flocculation.

[0003] After searching, the patent with publication number CN108911080A discloses a sewage treatment stirring tank, which comprises a stirring tank body and a stirring device. The stirring device comprises a stirring assembly, an angle adjusting assembly, a front and rear swinging driving assembly and a left and right swinging driving assembly. The stirring assembly comprises a stirring driving part, a stirring shaft and a stirring propeller. The angle adjusting assembly comprises a fixed seat, an angle adjusting spring and a shaft sleeve. The stirring driving part is installed on the support beam, the stirring shaft is accommodated in the shaft accommodating cavity, one end of the stirring shaft is connected with the output end of the stirring driving part through a universal coupling, and the other end of the stirring shaft is connected with the stirring propeller. The front and rear swinging driving assembly comprises a front and rear telescopic driving part and a front and rear swinging fixing part. The left and right swinging driving assembly comprises a left and right telescopic driving part and a left and right swinging fixing part. The sewage treatment stirring tank of the patent simplifies the structure of the stirring device and realizes wide-range and multi-angle stirring of sewage.

[0004] Based on the search and prior art, it is found that the mixing stage is to make the coagulant quickly and uniformly dispersed in water through rapid stirring; the flocculation stage is to gradually increase the destabilized colloidal particles through the way of opposite flocculation and same direction flocculation, and the stirring intensity should be gradually reduced with the increase of the flocculation body, and a certain flocculation time should be maintained, so that the flocculation body can be stably increased to improve the coagulation effect, because too fast stirring speed will cut the flocculation body; during the use of the above device, if the normal formation of the flocculation body is required, and the stable increase of the flocculation body is ensured, it is often necessary to check regularly, such as using the structure for rapid stirring to ensure sufficient mixing, and the workers need to observe the formation of the flocculation body, and then reduce the speed to make the flocculation body stably increase, which undoubtedly increases the labor intensity of the workers, and the stirring process and time need to be strictly controlled, if the coagulant is not enough, and the flocculation body has been formed, the workers need to wait for the flocculation body to settle, and then fish it up, so as to supplement the coagulant. SUMMARY

[0005] The purpose of the present application is to provide a municipal sewage treatment device to solve the problems in the background art.

[0006] The technical scheme of the present application is: a municipal sewage treatment device, comprising a treatment tank, a hollow cylinder coaxially arranged in the treatment tank, the bottom of the hollow cylinder being higher than the bottom of the treatment tank, and the top of the hollow cylinder being lower than the top of the treatment tank, a rotating rod and a sleeve coaxially arranged in the hollow cylinder, the sleeve being sleeved on the rotating rod and forming a rotating fit thereon, a driving assembly arranged on the top of the treatment tank for driving the rotating rod and the sleeve to rotate at different speeds in the same direction, first spiral leaves with small pitch fixed on the outside of the sleeve, second spiral leaves with gradually increasing pitch fixed on the outside of the rotating rod, the first spiral leaves being located above the second spiral leaves, and a space being left between the first spiral leaves and the second spiral leaves, a material guide pipe fixed on the top of the treatment tank and arranged obliquely with one end located above the hollow cylinder, a baffle fixed at the top inside of the treatment tank, the top of the baffle being flush with the top of the treatment tank, and the bottom of the baffle being lower than the top of the hollow cylinder, the baffle dividing the top area of the treatment tank into a sewage inlet area and a sewage outlet area, the hollow cylinder being located in the sewage inlet area, a frame plate fixed to the bottom of the baffle and the inner wall of the treatment tank, and a filter cloth fixed to the bottom of the frame plate, the filter cloth covering the entire sewage outlet area, and a water flow groove formed by extending the top of one side of the treatment tank outward, the water flow groove being in communication with the sewage outlet area.

[0007] Preferably, the driving assembly comprises a hollow box, a first servo deceleration motor, an output rod, two small gears and two big gears, the hollow box is arranged above the treatment tank, a plurality of supporting rods are fixed between the hollow box and the treatment tank, the output rod is located in the hollow box and both ends of the output rod are rotatably installed on the hollow box, the first servo deceleration motor is fixed with the hollow box and the output shaft of the first servo deceleration motor is coaxially fixed with the output rod, the rotating rod and the sleeve are rotatably matched with the hollow box, one of the small gears and one of the big gears are coaxially fixed with the output rod, the other small gear and the other big gear are coaxially fixed with the rotating rod and the sleeve respectively, and the two small gears and the two big gears are intermeshed.

[0008] Preferably, the top end of the material guide pipe is fixed with a feeding hopper in communication therewith.

[0009] Preferably, the bottom of the hollow cylinder is expanded outwardly to form a conical flared opening.

[0010] Preferably, the bottom of the rotating rod is fixed with a plurality of triangular plates which are equidistantly and annularly distributed around the central axis thereof, and the triangular plates are located in the conical flared opening.

[0011] Preferably, the inside of the treatment tank is fixed with a conical cover, the bottom of the conical cover is higher than the bottom of the treatment tank, the conical cover is coaxially arranged with the hollow cylinder, and a part of the bottom of the hollow cylinder is located in the conical cover, the inner wall of the conical cover is fixed with a plurality of turbulence rings which are coaxially arranged with the conical cover and have an arc-shaped cross section, and the arc opening of the turbulence ring is arranged downward.

[0012] Preferably, the top end of the conical cover is fixed with a concentrating cover which is coaxially arranged with the conical cover.

[0013] Preferably, the bottom of the rotating rod is fixed with a plurality of push plates which are equidistantly and annularly distributed around the central axis thereof, the bottom of the treatment tank is provided with a through opening, the outer side of the treatment tank is provided with an elbow pipe, one end of the elbow pipe is located below the through opening and is in communication with the through opening, the other end of the elbow pipe is higher than the top of the treatment tank, the top end of the elbow pipe is provided with a discharge opening which is higher than the top of the treatment tank, the inside of the elbow pipe is provided with a soft spiral blade, both ends of the soft spiral blade are fixed with shafts which are rotatably installed at both ends of the elbow pipe, the top of the elbow pipe is fixed with a servo motor, and the output shaft of the servo motor is coaxially fixed with one of the fixed shafts.

[0014] Preferably, the outer side of the hollow cylinder is fixed with an annular box coaxially arranged therewith, the outer side of the treatment tank is embeddedly fixed with a communication cylinder, one end of the communication cylinder is fixed and communicated with the annular box, the top of the annular box is provided with an annular groove coaxially arranged therewith, the inner side of the annular groove is rotatably installed with a circular ring, the top annular surface of the circular ring is fixed with a plurality of reference cylinders which are equidistantly and annularly distributed with the central axis as the center, one end of the reference cylinder is rotatably installed with a driven rod, the outer side of the driven rod is fixed with a scraper.

[0015] Preferably, the outer side of the treatment tank is fixed with a second servo deceleration motor, the inner side of the communication cylinder is rotatably installed with a transmission rod, the output shaft of the second servo deceleration motor is coaxially fixed with the transmission rod, one end of the transmission rod is fixed with a main bevel gear coaxially arranged therewith, one end of the circular ring is fixed with a bevel gear ring coaxially arranged therewith and engaged with the main bevel gear.

[0016] The municipal sewage treatment device provided by the application has the following improvements and advantages compared with the prior art. Firstly, the driving assembly is used to make the rotating rod and the sleeve rotate at the same direction and different speeds (the rotating speed of the rotating rod is smaller than that of the sleeve), the first helical blade with small pitch is used for high-speed stirring, the sewage and the coagulant can be fully and uniformly mixed in a short time, the flocculation is quickly promoted, and the mixing reaction efficiency is greatly improved; the buffer space transition between the first helical blade and the second helical blade is combined with the design that the pitch of the second helical blade gradually increases, so that the stirring speed gradually changes from fast to slow, the flocculation is stably aggregated and increased, the flocculation fully absorbs the suspended particles in the sewage, and the sedimentation performance of the flocculation is significantly improved; the flocculation is quickly mixed and slowly cultivated, the links are smoothly connected, the efficient cooperation of impurity removal, flocculation formation and sedimentation is realized, and the purification effect and the treatment efficiency of the sewage treatment are effectively improved. Secondly, the first helical blade and the second helical blade are used to make the sewage form a circulating flow from top to bottom in the treatment tank, so that the flocculation which does not fully absorb impurities can participate in the treatment process again, the flocculation is not wasted, and the utilization efficiency of the flocculation is improved; the flocculation which does not complete full adsorption is gathered at the top of the conical cover, the flow channel is reduced, the water flow state changes, the flocculation collides and aggregates with each other, and the flocculation is more likely to capture the suspended impurities in the sewage, thereby laying a solid foundation for the subsequent sedimentation process; the cross section of the spoiler ring is arc-shaped and the arc opening is downward, so that the sewage and the flocculation flowing through the spoiler ring form a turbulent flow, the smooth flow state is broken, the contact area and the contact frequency of the flocculation and the impurities in the sewage are greatly increased, and the adsorption effect of the flocculation on the pollutants is significantly improved. Thirdly, the push plate rotates with the rotating rod, the push plate pushes the flocculation precipitated at the bottom of the treatment tank to the opening, the flocculation falls into the elbow pipe, the servo motor makes the soft helical blade rotate, the soft helical blade takes out the flocculation to the discharge port by the helical transmission, and the flocculation can be continuously discharged without regular cleaning by workers; Fourthly, the second servo reduction motor drives the transmission rod to rotate through the output shaft, the transmission rod drives the bevel gear ring through the main bevel gear, the bevel gear ring drives the circular ring to rotate, each reference cylinder on the circular ring moves in a circle with the center of the circular ring, when the driven rod passes through the frame plate, the scraper on the driven rod contacts the filter cloth on the frame plate, the driven rod rotates passively, the coil spring reverses, the scraper on the driven rod cleans the filter cloth, when the driven rod leaves the filter cloth, the driven rod resets with the help of the coil spring, and the driven rod shakes the impurities on the scraper upwards, so that the sewage can be brought into the hollow cylinder and the subsequent flocculation can be absorbed. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application. Figure 2 It is a schematic diagram of the internal first perspective three-dimensional structure of the present application. Figure 3 It is a schematic diagram of the internal second perspective three-dimensional structure of the present application. Figure 4 It is a schematic diagram of the internal second perspective three-dimensional structure of the present application. Figure 3 Figure 5 It is a first perspective sectional view of the present application. Figure 6 It is a schematic diagram of the internal second perspective three-dimensional structure of the present application. Figure 5 Figure 7 It is a schematic diagram of the internal second perspective three-dimensional structure of the present application. Figure 8 It is a schematic diagram of the internal second perspective three-dimensional structure of the present application. Figure 9 It is a schematic diagram of the internal second perspective three-dimensional structure of the present application.

[0019] Reference signs: ​​1, processing tank; 2, hollow cylinder; 3, rotating rod; 4, sleeve; 5, first spiral blade; 6, second spiral blade; 7, material guide pipe; 8, baffle; 9, frame plate; 10, filter cloth; 11, water flow tank; 12, hollow box; 13, first servo reduction motor; 14, output rod; 15, pinion; 16, gear; 17, support rod; 18, feed hopper; 19, conical flared; 20, cam; 21, conical cover; 22, spoiler ring; 23, concentration cover; 24, push plate; 25, through hole; 26, elbow; 27, soft spiral blade; 28, servo motor; 29, ring box; 30, communication cylinder; 31, circular ring; 32, reference cylinder; 33, driven rod; 34, coil spring; 35, scraper; 36, second servo reduction motor; 37, main bevel gear; 38, bevel gear ring. DETAILED DESCRIPTION

[0020] The application will be described in detail below, and the technical solutions in the embodiments of the application will be clearly and completely described. Obviously, the described embodiments are only some of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the application.

[0021] The application provides a municipal sewage treatment device by improvement, and the technical scheme of the application is: As Figures 1 to 9As shown, the embodiment of the present application provides a municipal sewage treatment device, which comprises a treatment tank 1, the inside of the treatment tank 1 is provided with a hollow cylinder 2 coaxially arranged therein, the bottom of the hollow cylinder 2 is higher than the bottom of the treatment tank 1, the top of the hollow cylinder 2 is lower than the top of the treatment tank 1, the inside of the hollow cylinder 2 is provided with a rotating rod 3 and a sleeve 4 coaxially arranged therein, the sleeve 4 is sleeved on the rotating rod 3 and the two form a rotating fit, the top of the treatment tank 1 is provided with a driving assembly for driving the rotating rod 3 and the sleeve 4 to rotate at different speeds in the same direction, the outside of the sleeve 4 is fixedly provided with first spiral blades 5 with small pitch, the outside of the rotating rod 3 is fixedly provided with second spiral blades 6 with gradually increasing pitch, the first spiral blades 5 are located above the second spiral blades 6, and a space is left between the first spiral blades 5 and the second spiral blades 6, the top of the treatment tank 1 is fixedly provided with a material guide pipe 7, the material guide pipe 7 is arranged obliquely and one end thereof is located above the hollow cylinder 2, the inside of the treatment tank 1 is fixedly provided with a baffle 8 at the top position, the top of the baffle 8 is flush with the top of the treatment tank 1, and the bottom of the baffle 8 is lower than the top of the hollow cylinder 2, the baffle 8 divides the top area of the treatment tank 1 into a sewage inlet area and a sewage outlet area, the hollow cylinder 2 is located in the sewage inlet area, a frame plate 9 fixedly connected with the bottom of the baffle 8 and the inner wall of the treatment tank 1 is arranged in the sewage outlet area, and the bottom of the frame plate 9 is fixedly provided with filter cloth 10, the filter cloth 10 covers the entire sewage outlet area, and the top of one side of the treatment tank 1 extends outward to form a water flow groove 11, the water flow groove 11 is in communication with the sewage outlet area; Through the above connection relationship, sewage is continuously poured into the sewage inlet area through the pipe flow guiding mode until the entire treatment tank 1 is filled, at this time, part of the sewage passes through the filter cloth 10 for fine filtration, the filtered sewage flows out from the water flow groove 11 in the sewage outlet area through overflow, the coagulant (or coagulant aid) is poured into the material guide pipe 7, flows into the top of the hollow cylinder 2 after being guided by the material guide pipe 7, at this time, the driving assembly drives the rotating rod 3 and the sleeve 4 to rotate in the same direction at different speeds, it needs to be explained here that the rotating speed of the rotating rod 3 is less than that of the sleeve 4, the first spiral blades 5 wind the sewage and the coagulant into the hollow cylinder 2, since the outside of the sleeve 4 is fixedly provided with the first spiral blades 5 with small pitch and the sleeve 4 rotates at a speed, the sewage is subjected to multiple spiral stirring in the region of the first spiral blades 5, so that the sewage and the coagulant can be rapidly mixed in a short time, the floc is formed, the formed floc enters the space left between the first spiral blades 5 and the second spiral blades 6 for buffering, the second spiral blades 6 on the rotating rod 3 subsequently wind the buffered sewage and floc, since the pitch of the second spiral blades 6 gradually increases, the stirring speed will be slower and slower in the downward process, slow stirring is realized, which is beneficial to the stable increase of the floc, so that the floc can adsorb particles in the sewage and more easily precipitate; In summary, the driving assembly makes the rotating rod 3 and the sleeve 4 rotate at different speeds in the same direction (the rotating speed of the rotating rod 3 is less than that of the sleeve 4), and the first helical blade 5 with small pitch is used for high-speed stirring, so that the sewage and the coagulant can be fully and uniformly mixed in a short time, the flocculation is quickly promoted, and the mixing reaction efficiency is greatly improved; through the transition of the buffer space between the first and second helical blades 6, and in combination with the design that the pitch of the second helical blade 6 gradually increases, the stirring speed gradually changes from fast to slow, which not only ensures the stable aggregation and increase of the flocculation, but also promotes the flocculation to fully adsorb the suspended particles in the sewage, and significantly improves the sedimentation performance of the flocculation; the fast mixing and slow cultivation of the flocculation are smoothly connected, the efficient cooperation of impurity removal, flocculation formation and sedimentation is realized, and the purification effect and treatment efficiency of the sewage treatment are effectively improved.

[0022] Preferably, in combination with the accompanying drawings Figure 1 and the accompanying drawings Figure 8 As shown in the drawings, the driving assembly comprises a hollow box 12, a first servo reduction motor 13, an output rod 14, two pinions 15 and two gears 16, the hollow box 12 is arranged above the treatment tank 1, a plurality of supporting rods 17 are fixed between the hollow box 12 and the treatment tank 1, the output rod 14 is located in the hollow box 12, and both ends of the output rod 14 are rotatably installed on the hollow box 12, the first servo reduction motor 13 is fixed with the hollow box 12, and the output shaft of the first servo reduction motor 13 is coaxially fixed with the output rod 14, the rotating rod 3 and the sleeve 4 are rotatably connected with the hollow box 12, one of the pinions 15 and one of the gears 16 are coaxially fixed with the output rod 14, the other pinion 15 and the other gear 16 are coaxially fixed with the rotating rod 3 and the sleeve 4 respectively, and the two pinions 15 and the two gears 16 are intermeshed. From the above connection relationship, the specific working process of the driving assembly can be known: the first servo reduction motor 13 drives the output rod 14 to rotate through the output shaft, the pinions 15 and the gears 16 on the output rod 14 rotate with it, the pinion 15 on the output rod 14 drives the gear 16 on the rotating rod 3 to rotate, so that the rotating rod 3 rotates slowly, and the gear 16 on the output rod 14 drives the pinion 15 on the sleeve 4 to rotate, so that the sleeve 4 rotates quickly, so it can be known that the driving assembly is used to drive the rotating rod 3 and the sleeve 4 to rotate at different speeds in the same direction.

[0023] Preferably, in combination with the accompanying drawings Figure 1 As shown in the drawings, the top end of the material guide pipe 7 is fixed with a feeding hopper 18 which is communicated with the material guide pipe 7, and the feeding hopper 18 is arranged to facilitate the pouring of the coagulant into the material guide pipe 7.

[0024] Preferably, in combination with the accompanying drawings Figures 1-5As shown, the bottom of the hollow cylinder 2 is outwardly flared to form a conical flared portion 19, which is arranged to diffuse the floc outwardly and increase the contact degree with the sewage.

[0025] Preferably, in combination with the accompanying drawings Figures 2-5 As shown, the bottom of the rotating rod 3 is fixed with a plurality of equidistant annularly distributed triangular plates 20 with the central axis as the center, and the triangular plates 20 are located in the conical flared portion 19. The triangular plates 20 rotate with the rotating rod 3, which is arranged to provide a pushing force to the floc to increase the diffusion degree of the floc, thereby increasing the contact degree with the sewage and being able to adsorb more impurities.

[0026] Preferably, in combination with the accompanying drawings Figures 3-6 As shown, the inside of the treatment tank 1 is fixed with a conical cover 21, the bottom of the conical cover 21 is higher than the bottom of the treatment tank 1, the conical cover 21 is coaxially arranged with the hollow cylinder 2, and a part of the bottom of the hollow cylinder 2 is located in the conical cover 21. The inner wall of the conical cover 21 is fixed with a plurality of turbulence rings 22 which are coaxially arranged with the conical cover 21 and have an arc-shaped cross section. The arc of the turbulence ring 22 is arranged downward. Due to the arrangement of the first spiral blade 5 and the second spiral blade 6, the sewage in the treatment tank 1 is in a circulating flow process from top to bottom. The floc that is not able to adsorb enough impurities to flow upward will converge at the top of the conical cover 21. The sewage flow channel is in a reduced state, and the floc can more easily adsorb impurities in the sewage, thereby more easily precipitating. Since the cross section of the turbulence ring 22 is arc-shaped and the arc is arranged downward, when the sewage and the floc pass through the turbulence ring 22, a turbulent flow is formed, the contact degree between the floc and the sewage is increased, and the adsorption efficiency of the floc is improved. As can be seen from the above, the first and second spiral blades 6 make the sewage in the treatment tank 1 form a circulating flow from top to bottom, allowing the floc that has not fully adsorbed impurities to participate in the treatment process again, avoiding waste of the floc and improving the utilization efficiency of the floc. The floc that has not fully adsorbed impurities converges at the top of the conical cover 21. Due to the reduction of the flow channel, the water flow state changes, prompting the floc to collide and coagulate with each other, more easily capturing suspended impurities in the sewage, and laying a solid foundation for the subsequent precipitation process. The design of the arc-shaped cross section of the turbulence ring 22 and the downward arc can make the sewage and the floc flowing through form a turbulent flow, break the smooth flow state, greatly increase the contact area and contact frequency between the floc and the impurities in the sewage, and significantly strengthen the adsorption effect of the floc on the pollutants.

[0027] Preferably, in combination with the accompanying drawings Figure 3 and the accompanying drawings Figure 5 As shown, the top end of the conical cover 21 is fixed with a concentrating cover 23 which is coaxially arranged with the conical cover 21. The concentrating cover 23 is arranged to allow the falling floc to flow into the conical cover 21.

[0028] Preferably, in combination with the accompanying drawings Figures 1-3As shown, the bottom of the rotating rod 3 is fixed with a plurality of push plates 24 which are equidistantly distributed in a ring shape with the central axis as the center, the bottom of the processing tank 1 is provided with a through port 25, the outer side of the processing tank 1 is provided with a bend pipe 26, one end of the bend pipe 26 is located below the through port 25 and is communicated with the through port 25, the other end of the bend pipe 26 is higher than the top of the processing tank 1, the top end of the bend pipe 26 is provided with a discharge port which is higher than the top of the processing tank 1, the inside of the bend pipe 26 is provided with a soft spiral blade 27, the two ends of the soft spiral blade 27 are fixed shafts which are rotatably installed on the two ends of the bend pipe 26, the top of the bend pipe 26 is fixed with a servo motor 28, the output shaft of the servo motor 28 is coaxially fixed with one of the fixed shafts; It needs to be noted that the discharge port is higher than the top of the processing tank 1, according to the principle of the communicating vessel, thus the sewage cannot flow out from the discharge port; It needs to be further noted that the soft spiral blade 27 is a prior art and will not be described in detail here, the soft spiral blade 27 is shaftless at the positions of the two ends, thus the sewage is difficult to be taken out by the soft spiral blade 27, and the soft spiral blade 27 can be perforated on the blade surface to make the sewage more difficult to be taken out Through the above connection relationship, it can be known that the push plate 24 rotates with the rotating rod 3, the push plate 24 pushes the flocculation body deposited at the bottom of the processing tank 1 to the through port 25, the flocculation body falls into the bend pipe 26, the servo motor 28 makes the soft spiral blade 27 rotate, the soft spiral blade 27 takes out the flocculation body to the discharge port through the spiral transmission and discharges, since it is known that the flocculation body after deposition can be continuously discharged, it is not necessary for workers to clean regularly.

[0029] Preferably, in combination with the accompanying drawings Figures 1-6 As shown, the outer side of the hollow cylinder 2 is fixed with an annular box 29 which is coaxially arranged, the outer side of the processing tank 1 is embeddedly fixed with a communicating cylinder 30, one end of the communicating cylinder 30 is fixed and communicated with the annular box 29, the top of the annular box 29 is provided with an annular groove which is coaxially arranged, the inside of the annular groove is rotatably installed with a circular ring 31, the top annular surface of the circular ring 31 is fixed with a plurality of reference cylinders 32 which are equidistantly distributed in a ring shape with the central axis as the center, one end of the reference cylinder 32 is rotatably installed with a driven rod 33, the driven rod 33 is commonly fixed with a coil spring 34 together with the reference cylinder 32, the outer side of the driven rod 33 is fixed with a scraper 35, the outer side of the processing tank 1 is fixed with a second servo reduction motor 36, the inside of the communicating cylinder 30 is rotatably installed with a transmission rod, the output shaft of the second servo reduction motor 36 is coaxially fixed with the transmission rod, one end of the transmission rod is fixed with a main bevel gear 37 which is coaxially arranged, one end of the circular ring 31 is fixed with a bevel gear ring 38 which is coaxially arranged and is engaged with the main bevel gear 37; From the above connection relationship can be known, the second servo motor 36 through the output shaft makes the transmission rod rotate, the transmission rod through the main bevel gear 37 to move the bevel gear ring 38, the bevel gear ring 38 drives the circular ring 31 to rotate, each reference cylinder 32 on the circular ring 31 moves in a circle with the center of the circular ring 31, when the driven rod 33 passes through the frame plate 9, the scraper 35 on the driven rod 33 contacts the filter cloth 10 on the frame plate 9, the driven rod 33 is passively rotated, the coil spring 34 is reversed, the scraper 35 on the driven rod 33 cleans the filter cloth 10, when the driven rod 33 leaves the filter cloth 10, the driven rod 33 resets with the help of the coil spring 34, the driven rod 33 shakes the impurities on the scraper 35 upwards, which facilitates the sewage into the hollow cylinder 2 and the subsequent flocculation absorption.

[0030] Working principle: Firstly, the sewage is continuously poured into the sewage inlet area through the pipeline drainage mode until the entire treatment tank 1 is filled, at this time, part of the sewage passes through the filter cloth 10 for fine filtration, and the filtered sewage flows out from the overflow water tank 11 in the sewage outlet area; Secondly, the coagulant (or coagulant aid) is poured into the material guide pipe 7, guided by the material guide pipe 7, and flows into the top of the hollow cylinder 2, the first servo motor 28 is started, the first servo motor 13 rotates the output rod 14 through the output shaft, the small gear 15 and the large gear 16 on the output rod 14 rotate, the small gear 15 on the output rod 14 drives the large gear 16 on the rotating rod 3, so that the rotating rod 3 rotates slowly, similarly, the large gear 16 on the output rod 14 drives the small gear 15 on the sleeve 4, so that the sleeve 4 rotates quickly, so the driving assembly is used to drive the rotating rod 3 and the sleeve 4 to rotate at the same speed and different speeds, the first spiral blade 5 winds the sewage and the coagulant into the hollow cylinder 2, because the sleeve 4 is fixed with the first spiral blade 5 with small pitch on the outside, and the sleeve 4 rotates at high speed, so the sewage is stirred in multiple spirals in the area of the first spiral blade 5, so that the sewage and the coagulant can be quickly mixed in a short time, the flocculation is formed, the formed flocculation enters the space between the first spiral blade 5 and the second spiral blade 6, and is buffered, the second spiral blade 6 on the rotating rod 3 then winds the buffered sewage and flocculation, because the pitch of the second spiral blade 6 gradually increases, so the stirring speed will become slower and slower downward, realizing slow stirring, which is convenient for the stable increase of the flocculation, so that it can absorb the particles in the sewage and more easily precipitate; The triangular plate 20 rotates with the rotating rod 3, which is arranged to provide a thrust to the flocculation, so that the diffusion degree of the flocculation increases, thereby improving the contact degree with the sewage and being able to absorb more impurities; Due to the arrangement of the first spiral blade 5 and the second spiral blade 6, the sewage in the treatment tank 1 is in a circulating flow process from top to bottom, and the process that the flocculation that is not able to adsorb enough flocculation flows upwards is concentrated and converged at the top of the conical cover 21, the sewage flow channel is in a reduced state, and the flocculation can more easily adsorb impurities in the sewage, so that precipitation is more likely to occur, and due to the fact that the cross section of the spoiler ring 22 is arc-shaped and the arc opening is arranged downward, when the sewage and the flocculation pass through the spoiler ring 22, a turbulent flow is formed, the contact degree of the flocculation with the sewage is increased, and the flocculation adsorption efficiency is improved; The push plate 24 rotates with the rotating rod 3, the push plate 24 pushes the flocculation precipitated at the bottom of the treatment tank 1 to the through port 25, the flocculation falls into the elbow pipe 26, the servo motor 28 makes the soft spiral blade 27 rotate, the soft spiral blade 27 takes out the flocculation to the discharge port by spiral transmission, and the flocculation after precipitation can be continuously discharged without the need for workers to clean regularly; In the third step, the second servo deceleration motor 36 is started, the second servo deceleration motor 36 rotates the transmission rod through the output shaft, the transmission rod drives the bevel gear ring 38 through the main bevel gear 37, the bevel gear ring 38 drives the circular ring 31 to rotate, each reference cylinder 32 on the circular ring 31 moves in a circular motion with the center of the circular ring 31, when the driven rod 33 passes through the frame plate 9, the scraper 35 on the driven rod 33 contacts the filter cloth 10 on the frame plate 9, the driven rod 33 is passively rotated, the coil spring 34 is reversed, the scraper 35 on the driven rod 33 cleans the filter cloth 10, when the driven rod 33 leaves the filter cloth 10, the driven rod 33 is reset by the coil spring 34, and the driven rod 33 shakes off the impurities on the scraper 35 upwards, so that the sewage is brought into the hollow cylinder 2 and the subsequent flocculation absorption is facilitated.

[0031] The above description enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Accordingly, the present application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A municipal sewage treatment plant comprising a treatment tank (1), characterised in that: The inside of the treatment tank (1) is provided with a hollow cylinder (2) coaxially arranged therein, the bottom of the hollow cylinder (2) is higher than the bottom of the treatment tank (1), the top of the hollow cylinder (2) is lower than the top of the treatment tank (1), the inside of the hollow cylinder (2) is provided with a rotating rod (3) and a sleeve (4) coaxially arranged therein, the sleeve (4) is sleeved on the rotating rod (3) and the two form a rotating fit, the top of the treatment tank (1) is provided with a driving assembly for driving the rotating rod (3) and the sleeve (4) to rotate at the same direction and different speeds, the outside of the sleeve (4) is fixed with first helical blades (5) with small pitch, the outside of the rotating rod (3) is fixed with second helical blades (6) with gradually increasing pitch, the first helical blades (5) are located above the second helical blades (6), and a space is left between the first helical blades (5) and the second helical blades (6), the top of the treatment tank (1) is fixed with a material guide pipe (7) which is arranged obliquely and one end of which is located above the hollow cylinder (2), the inside of the top of the treatment tank (1) is fixed with a baffle (8), the top of the baffle (8) is flush with the top of the treatment tank (1), and the bottom of the baffle (8) is lower than the top of the hollow cylinder (2), the baffle (8) divides the top area of the treatment tank (1) into a sewage entering area and a sewage discharging area, the hollow cylinder (2) is located in the sewage entering area, a frame plate (9) is arranged in the sewage discharging area and fixed with the bottom of the baffle (8) and the inner wall of the treatment tank (1), and the bottom of the frame plate (9) is fixed with filter cloth (10) which covers the entire sewage discharging area, the top of one side of the treatment tank (1) extends outward to form a water flow groove (11) which is connected with the sewage discharging area.

2. A municipal sewage treatment plant according to claim 1, characterised in that: The driving assembly comprises a hollow box (12), a first servo reduction motor (13), an output rod (14), two pinions (15) and two gear wheels (16), the hollow box (12) is arranged above the treatment tank (1), a plurality of supporting rods (17) are fixed between the hollow box (12) and the treatment tank (1), the output rod (14) is located in the hollow box (12) and both ends of the output rod (14) are rotatably installed on the hollow box (12), the first servo reduction motor (13) is fixed with the hollow box (12), and the output shaft of the first servo reduction motor (13) is coaxially fixed with the output rod (14), the rotating rod (3) and the sleeve (4) are rotatably connected with the hollow box (12), one of the pinions (15) and one of the gear wheels (16) are coaxially fixed with the output rod (14), the other of the pinions (15) and the other of the gear wheels (16) are coaxially fixed with the rotating rod (3) and the sleeve (4), and the two pinions (15) and the two gear wheels (16) are intermeshed.

3. The municipal sewage treatment device according to claim 1, characterized in that: The top end of the material guide pipe (7) is fixed with a feeding hopper (18) connected therewith.

4. The municipal sewage treatment device according to claim 1, characterized in that: The bottom of the hollow cylinder (2) is expanded outward to form a conical flared opening (19).

5. A municipal sewage treatment plant according to claim 4, characterised in that: The bottom of the rotating rod (3) is fixed with a plurality of triangular plates (20) that are equidistantly distributed in a ring with their central axis as the center, and the triangular plates (20) are located inside the conical flare (19).

6. The municipal sewage treatment device according to claim 1, characterized in that: The processing tank (1) is fixed with a conical shroud (21) inside. The bottom of the conical shroud (21) is higher than the bottom of the processing tank (1). The conical shroud (21) is coaxially arranged with the hollow cylinder (2), and a part of the bottom of the hollow cylinder (2) is located inside the conical shroud (21). Multiple turbulence rings (22) are fixed on the inner wall of the conical shroud (21) and are coaxially arranged with it and have an arc-shaped cross-section. The turbulence rings (22) are arranged with their arc openings facing downwards.

7. A municipal sewage treatment plant according to claim 6, characterised in that: The top of the conical cover (21) is fixed with a central cover (23) that is coaxial with it.

8. A municipal sewage treatment plant according to claim 7, characterised in that: The bottom of the rotating rod (3) is fixed with multiple push plates (24) that are equidistantly distributed in a ring with their central axis as the center. The bottom of the processing tank (1) is provided with an opening (25). A bent tube (26) is provided on the outside of the processing tank (1). One end of the bent tube (26) is located below the opening (25) and is connected to the opening (25). The other end of the bent tube (26) is higher than the top of the processing tank (1). The top of the bent tube (26) is provided with an outlet, and the outlet is higher than the top of the processing tank (1). A soft spiral blade (27) is provided inside the bent tube (26). The two ends of the soft spiral blade (27) are fixed on the two ends of the bent tube (26) respectively. A servo motor (28) is fixed on the top of the bent tube (26). The output shaft of the servo motor (28) is coaxially fixed with one of the fixed shafts.

9. A municipal sewage treatment plant according to claim 8, characterised in that: An annular box (29) coaxially arranged with the hollow cylinder (2) is fixed to the outside of the hollow cylinder (2). A connecting cylinder (30) is embedded and fixed to the outside of the processing tank (1). One end of the connecting cylinder (30) is fixed and connected to the annular box (29). An annular groove coaxially arranged with the annular box (29) is opened at the top. A circular ring (31) is rotatably installed inside the annular groove. A plurality of reference cylinders (32) are equidistantly distributed in a ring with their central axis as the center on the top surface of the circular ring (31). A driven rod (33) is rotatably installed at one end of the reference cylinder (32). A coil spring (34) is fixed together with the reference cylinder (32). A scraper (35) is fixed to the outside of the driven rod (33).

10. A municipal sewage treatment plant according to claim 9, characterised in that: A second servo geared motor (36) is fixed on the outside of the processing tank (1). A transmission rod is rotatably installed inside the connecting cylinder (30). The output shaft of the second servo geared motor (36) is fixed coaxially with the transmission rod. A main bevel gear (37) is fixed at one end of the transmission rod and is coaxially arranged with it. A bevel gear ring (38) is fixed at one end of the ring (31) and is coaxially arranged with it and meshes with the main bevel gear (37).

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