A sedimentation and filtration device for urban wastewater treatment

Abstract

The present invention relates to a filtering device, and particularly to a sedimentation and filtering device for urban wastewater treatment. It is necessary to design a sedimentation and filtering device for urban wastewater treatment that can facilitate the purification of urban wastewater and has a low treatment cost. A sedimentation and filtering device for urban wastewater treatment includes a filtering bottom cylinder, a support bottom frame, a water inlet pipe, and a water outlet pipe. The lower part of the outer wall of the filtering bottom cylinder is fixedly connected with the support bottom frame. The upper side of the left part of the filtering bottom cylinder is connected with the water inlet pipe, and the lower side of the right part of the filtering bottom cylinder is connected with the water outlet pipe. In the present invention, the wastewater is discharged into the filtering bottom cylinder through the water inlet pipe. The servo motor is started, and the material distribution roller rotates forward, causing the precipitant to intermittently discharge into the filtering bottom cylinder from the feed conduit. At the same time, the stirring spiral plate rotates forward to stir the wastewater and the precipitant. The precipitant is mixed with the wastewater and purified. Subsequently, the treated wastewater is discharged through the water outlet pipe. In this way, it is possible to facilitate the purification of urban wastewater and the treatment cost is low.

Description

Technical Field

[0001] The present invention relates to a filtering device, and in particular to a sedimentation and filtration device for urban wastewater treatment. Background Art

[0002] Urban sewage can be classified into domestic sewage, industrial wastewater and runoff sewage according to its source. Domestic sewage mainly comes from families, institutions, commerce and urban public facilities, among which the main components are feces and washing sewage. It is collectively discharged into the urban sewer pipe network system and transported to the sewage treatment plant for treatment and then discharge.

[0003] Patent application CN207210159U discloses a purification device for urban wastewater treatment that is convenient to use, including a base. On the top of the base, a filtration chamber, a disinfection chamber, a sewage pump, a purification chamber, a water extraction pump and a water storage chamber are fixedly connected in sequence from left to right. The lower part of the right side of the filtration chamber is fixedly communicated with a connecting pipe, and one end of the connecting pipe away from the filtration chamber is fixedly communicated with the lower part of the left side of the disinfection chamber. The lower part of the right side of the disinfection chamber is fixedly communicated with a first conduit. This purification device for urban wastewater treatment that is convenient to use can filter, disinfect, purify and sterilize domestic sewage, can effectively remove impurities in the sewage, can recycle water resources, effectively avoids waste of water resources, and also avoids pollution of underground water sources. The sewage purification efficiency is high, it can perform multi-combination purification treatment on domestic sewage, can store the purified water source, and has a high water resource recycling rate. Although the above patent can realize the filtration treatment of sewage, the device structure is simple, the energy consumption and floor area are too large, resulting in a high treatment cost.

[0004] Based on the defects existing in the above patent, it is necessary to design a sedimentation and filtration device for urban wastewater treatment that can conveniently purify urban wastewater and has a small treatment cost. Summary of the Invention

[0005] In order to overcome the shortcomings of the above patent that the device structure is simple, the energy consumption and floor area are too large, resulting in a high treatment cost, the present invention provides a sedimentation and filtration device for urban wastewater treatment that can conveniently purify urban wastewater and has a small treatment cost.

[0006] The technical solution of the present invention is as follows:

[0007] A sedimentation and filtration device for urban wastewater treatment, comprising a filtering bottom cylinder, a supporting bottom frame, a water inlet pipe, a water outlet pipe, a filter mesh cover, a feeding box, a feeding conduit, a stirring mechanism and a feeding mechanism. The lower part of the outer wall of the filtering bottom cylinder is fixedly connected with the supporting bottom frame. The upper side of the left part of the filtering bottom cylinder is connected with the water inlet pipe. The lower side of the right part of the filtering bottom cylinder is connected with the water outlet pipe. A filter mesh cover is fixedly connected inside the filtering bottom cylinder. The outer top wall of the filtering bottom cylinder is fixedly connected with the feeding box. The middle part of the upper part of the filtering bottom cylinder is connected with the feeding conduit, and the feeding conduit is communicated with the feeding box. A stirring mechanism for stirring the precipitant and wastewater is arranged on the filtering bottom cylinder, and a feeding mechanism for discharging the precipitant is arranged between the stirring mechanism and the feeding box.

[0008] Furthermore, the stirring mechanism includes a servo motor, a driving shaft and a stirring spiral plate. The middle part of the left side surface outside the filtering bottom cylinder is fixedly connected with the servo motor. The middle part of the filtering bottom cylinder is rotatably connected with the driving shaft. The left end of the driving shaft is fixedly connected with the output shaft of the servo motor, and a stirring spiral plate is fixedly connected to the middle part of the output shaft.

[0009] Furthermore, the feeding mechanism includes a reversing shaft, a fixed cover, reversing bevel gears and a distributing roller. The lower rear side of the left part of the feeding box is fixedly connected with the fixed cover. The reversing shaft is rotatably connected to the fixed cover. The reversing shaft and the driving shaft are driven by a belt. The lower side of the left part of the feeding box is rotatably connected with the distributing roller. Reversing bevel gears are fixedly connected to the rear part of the distributing roller and the right part of the reversing shaft respectively, and the two reversing bevel gears mesh with each other.

[0010] Furthermore, it further includes a material distributing mechanism for evenly introducing the precipitant. The material distributing mechanism includes a driving missing gear, a driven gear, a positioning belt assembly, a material distributing rubber plate, a return spring and an electromagnetic guide rail. The driving missing gear is fixedly connected to the front part of the distributing roller. The positioning belt assembly is rotatably connected to the lower part of the feeding box. The positioning belt assembly consists of two belt pulleys and a belt. The two belt pulleys are respectively rotatably installed at the lower part of the feeding box, and the belt is wound between the two belt pulleys. The driven gear is fixedly connected to the front side of the left part of the positioning belt assembly. The missing gear can rotate and mesh with the driven gear. The material distributing rubber plate is fixedly connected to the positioning belt assembly. A return spring is connected between the rear part of the material distributing rubber plate and the inner side surface of the feeding box. The electromagnetic guide rail is fixedly connected to the lower rear side of the feeding box, and the electromagnetic guide rail is slidably connected with the material distributing rubber plate.

[0011] Furthermore, it further includes a liquid discharging mechanism for intermittent liquid discharging. The liquid discharging mechanism includes positioning side plates, positioning guide rods, positioning springs, limiting circular seats, positioning connecting shafts and diversion ball valve frames. The positioning guide rods are symmetrically fixedly connected to the upper rear part of the outer wall of the filtering bottom cylinder on the left and right sides. The positioning side plates are slidably connected between the left and right positioning guide rods. The material distributing rubber plate contacts the positioning side plates. Two positioning springs are connected between the left and right positioning guide rods and the top of the positioning side plates respectively. The left part of the water outlet pipe is rotatably connected with the positioning connecting shaft. Diversion ball valve frames are fixedly connected to the front and rear sides of the positioning connecting shaft. The diversion ball valve frames can control the flow of the water outlet pipe. The limiting circular seat is fixedly connected to the rear part of the positioning connecting shaft, and the limiting circular seat is slidably connected with the positioning side plate.

[0012] Further, it further includes a material guiding mechanism for further uniformly introducing the precipitant. The material guiding mechanism includes a material guiding plate, a fixed cross bar, a limiting short frame, a limiting cam, a reset guiding frame, and a buffer spring. The middle of the upper part of the filter bottom cylinder is rotatably connected with a fixed cross bar. A material guiding plate for further uniformly introducing the precipitant is fixedly connected to the middle of the fixed cross bar. The lower left side of the feed box is rotatably connected with a limiting short frame. The limiting short frame and the fixed cross bar are driven by a belt. A limiting cam is fixedly connected to the middle of the reversing shaft. The limiting cam contacts the limiting short frame. A reset guiding frame is fixedly connected to the lower part of the outer left side of the feed box. The reset guiding frame is slidably connected with the limiting short frame. Two buffer springs are connected between the front part of the limiting short frame and the left part of the reset guiding frame.

[0013] Further, it further includes a filtrate mechanism for preliminarily filtering the sewage. The filtrate mechanism includes an installation cover and a filter plate. An installation cover is connected to the water inlet pipe. Two filter plates for preliminarily filtering the sewage are fixedly connected inside the installation cover.

[0014] Further, it further includes anti-slip rubber sleeves. Four anti-slip rubber sleeves are fixedly connected at intervals to the lower part of the support bottom frame.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The wastewater of the present invention is discharged into the filter bottom cylinder through the water inlet pipe. The servo motor is started. The material distribution roller rotates forward, causing the precipitant to be intermittently discharged into the filter bottom cylinder from the feed conduit. At the same time, the stirring spiral plate rotates forward to stir the wastewater and the precipitant. The precipitant and the wastewater are mixed and purified. Subsequently, the treated wastewater is discharged through the water outlet pipe. In this way, it is convenient to purify urban wastewater, and the treatment cost is low.

[0017] 2. Under the action of the feeding mechanism of the present invention, the material pushing rubber plate moves to the right and resets to uniformly push the precipitant into the filter bottom cylinder. In this way, the precipitant can be uniformly dropped.

[0018] 3. Under the action of the material guiding mechanism of the present invention, the fixed cross bar rotates forward and backward to drive the material guiding plate to swing back and forth. The back-and-forth swing of the material guiding plate makes the precipitant more uniformly discharged into the wastewater. In this way, the precipitant can be further added into the wastewater. Description of the Drawings

[0019] Figure 1 It is a first perspective three-dimensional structure schematic diagram of the present invention.

[0020] Figure 2 It is a second perspective three-dimensional structure schematic diagram of the present invention.

[0021] Figure 3 It is a first kind of partial cross-sectional structure schematic diagram of the present invention.

[0022] Figure 4Partial sectional view structure diagram of the stirring mechanism of the present invention.

[0023] Figure 5 The first partial sectional view structure diagram of the feeding mechanism of the present invention.

[0024] Figure 6 The second partial sectional view structure diagram of the feeding mechanism of the present invention.

[0025] Figure 7 The second partial sectional view structure diagram of the present invention.

[0026] Figure 8 The first partial sectional view structure diagram of the material distributing mechanism of the present invention.

[0027] Figure 9 The second partial sectional view structure diagram of the material distributing mechanism of the present invention.

[0028] Figure 10 The first partial sectional view structure diagram of the liquid discharging mechanism of the present invention.

[0029] Figure 11 The second partial sectional view structure diagram of the liquid discharging mechanism of the present invention.

[0030] Figure 12 Enlarged schematic diagram of part A of the present invention.

[0031] Figure 13 The third partial sectional view structure diagram of the liquid discharging mechanism of the present invention.

[0032] Figure 14 The third partial sectional view structure diagram of the present invention.

[0033] Figure 15 The first partial sectional view structure diagram of the material guiding mechanism of the present invention.

[0034] Figure 16 The second partial sectional view structure diagram of the material guiding mechanism of the present invention.

[0035] Figure 17 Partial sectional view structure diagram of the filtrate mechanism of the present invention.

[0036] Names and serial numbers of components in the figure: 1 - Filter bottom cylinder, 2 - Support bottom frame, 21 - Anti-slip rubber sleeve, 3 - Water inlet pipe, 4 - Water outlet pipe, 5 - Filter screen cover, 6 - Feed box, 61 - Feed conduit, 7 - Stirring mechanism, 71 - Servo motor, 72 - Drive shaft, 73 - Stirring spiral plate, 8 - Feeding mechanism, 81 - Reversing shaft, 82 - Fixed cover, 83 - Reversing bevel gear, 84 - Dividing roller, 9 - Material pushing mechanism, 91 - Driving missing gear, 92 - Driven gear, 93 - Positioning belt assembly, 94 - Material pushing rubber plate, 95 - Return spring, 96 - Electromagnetic guide rail, 10 - Liquid outlet mechanism, 101 - Positioning side plate, 102 - Positioning guide rod, 103 - Positioning spring, 104 - Limiting round seat, 105 - Positioning coupling shaft, 106 - Diversion ball valve frame, 11 - Material guiding mechanism, 111 - Material guiding plate, 112 - Fixed cross bar, 113 - Limiting short frame, 114 - Limiting cam, 115 - Return guide frame, 116 - Buffer spring, 12 - Filtrate mechanism, 121 - Installation cover, 122 - Filter plate. Detailed implementation mode

[0037] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0038] Embodiment 1

[0039] A sedimentation and filtration device for urban wastewater treatment, as Figures 1-6 shown, includes a filter bottom cylinder 1, a support bottom frame 2, a water inlet pipe 3, a water outlet pipe 4, a filter screen cover 5, a feed box 6, a feed conduit 61, a stirring mechanism 7 and a feeding mechanism 8. The lower part of the outer wall of the filter bottom cylinder 1 is fixedly connected with the support bottom frame 2. The upper left side of the filter bottom cylinder 1 is connected with the water inlet pipe 3. The lower right side of the filter bottom cylinder 1 is connected with the water outlet pipe 4. A filter screen cover 5 is fixedly connected inside the filter bottom cylinder 1. The outer top wall of the filter bottom cylinder 1 is fixedly connected with the feed box 6. The middle of the upper part of the filter bottom cylinder 1 is connected with the feed conduit 61. The feed conduit 61 is communicated with the feed box 6. A stirring mechanism 7 is arranged on the filter bottom cylinder 1. A feeding mechanism 8 is arranged between the stirring mechanism 7 and the feed box 6. The feeding mechanism 8 can realize adding a precipitant, and the stirring mechanism 7 can realize stirring the precipitant and wastewater.

[0040] As Figure 1 shown, it further includes an anti-slip rubber sleeve 21. Four anti-slip rubber sleeves 21 are fixedly connected at intervals at the lower part of the support bottom frame 2.

[0041] As Figure 3 and Figure 4 shown, the stirring mechanism 7 includes a servo motor 71, a drive shaft 72 and a stirring spiral plate 73. The servo motor 71 is fixedly connected to the middle of the left side surface of the filter bottom cylinder 1. The drive shaft 72 is rotatably connected to the middle of the filter bottom cylinder 1. The left end of the drive shaft 72 is fixedly connected to the output shaft of the servo motor 71. The stirring spiral plate 73 is fixedly connected to the middle of the output shaft.

[0042] As Figure 3 、 Figure 5 and Figure 6 shown, the feeding mechanism 8 includes a reversing shaft 81, a fixed cover 82, reversing bevel gears 83 and a material distributing roller 84. A fixed cover 82 is fixedly connected to the lower rear side of the left part of the feeding box 6. A reversing shaft 81 is rotatably connected to the fixed cover 82. The reversing shaft 81 and the driving shaft 72 are connected by a belt drive. A material distributing roller 84 is rotatably connected to the lower side of the left part of the feeding box 6. Reversing bevel gears 83 are fixedly connected to the rear part of the material distributing roller 84 and the right part of the reversing shaft 81, and the two reversing bevel gears 83 mesh with each other.

[0043] First, the operator externally connects the water inlet pipe 3 and the water outlet pipe 4 to pipelines respectively, and then pours an appropriate amount of precipitant into the feeding box 6. The material distributing roller 84 limits the precipitant. The waste water is discharged into the filter bottom cylinder 1 through the water inlet pipe 3. The servo motor 71 is started, and the servo motor 71 drives the driving shaft 72 to rotate forward. The forward rotation of the driving shaft 72 drives the reversing shaft 81 to rotate forward through the belt drive. The forward rotation of the reversing shaft 81 drives the material distributing roller 84 to rotate forward through the two reversing bevel gears 83. The forward rotation of the material distributing roller 84 makes the precipitant intermittently discharged from the feeding conduit 61 into the filter bottom cylinder 1. At the same time, the forward rotation of the driving shaft 72 also drives the stirring spiral plate 73 to rotate forward. The forward rotation of the stirring spiral plate 73 stirs the waste water and the precipitant, and the mixture of the precipitant and the waste water is purified. The anti-slip rubber sleeve 21 can better shock-absorb the device. Subsequently, the treated waste water is discharged through the water outlet pipe 4. The filter mesh cover 5 can filter the impurities in the waste water. Repeating this way, the waste water can be continuously filtered. After all the waste water is settled and filtered, the servo motor 71 is turned off, and the driving shaft 72 stops driving the reversing shaft 81 to rotate forward through the belt drive, and the stirring spiral plate 73 also stops rotating forward.

[0044] Embodiment 2

[0045] On the basis of Embodiment 1, as Figures 7-10 shown, it further includes a material shifting mechanism 9. The material shifting mechanism 9 includes a driving missing gear 91, a driven gear 92, a positioning belt assembly 93, a material shifting rubber plate 94, a return spring 95 and an electromagnetic guide rail 96. A driving missing gear 91 is fixedly connected to the front part of the material distributing roller 84. A positioning belt assembly 93 is rotatably connected to the lower part of the feeding box 6. The positioning belt assembly 93 is composed of two belt wheels and a belt. The two belt wheels are respectively rotatably installed at the lower part of the feeding box 6, and the belt is wound between the two belt wheels. A driven gear 92 is fixedly connected to the front side of the left part of the positioning belt assembly 93. The missing gear can mesh with the driven gear 92. A material shifting rubber plate 94 is fixedly connected to the positioning belt assembly 93. A return spring 95 is connected between the rear part of the material shifting rubber plate 94 and the inner side surface of the feeding box 6. An electromagnetic guide rail 96 is fixedly connected to the lower rear side of the feeding box 6. The electromagnetic guide rail 96 is slidably connected to the material shifting rubber plate 94.

[0046] As Figure 7, Figure 11 , Figure 12 and Figure 13 As shown, it further includes a liquid outlet mechanism 10. The liquid outlet mechanism 10 includes a positioning side plate 101, a positioning guide rod 102, a positioning spring 103, a limiting circular seat 104, a positioning coupling shaft 105, and a diversion ball valve frame 106. The upper rear part of the outer wall of the filter bottom cylinder 1 is symmetrically and fixedly connected with positioning guide rods 102 on the left and right. A positioning side plate 101 is slidably connected between the positioning guide rods 102 on the left and right. The feeding rubber plate 94 contacts the positioning side plate 101. Two positioning springs 103 are connected between the positioning guide rods 102 on both sides and the top of the positioning side plate 101. The left part of the water outlet pipe 4 is rotatably connected with a positioning coupling shaft 105. Diversion ball valve frames 106 are fixedly connected to the front and rear sides of the positioning coupling shaft 105. The diversion ball valve frame 106 can control the flow of the water outlet pipe 4. A limiting circular seat 104 is fixedly connected to the rear part of the positioning coupling shaft 105. The limiting circular seat 104 is slidably connected with the positioning side plate 101.

[0047] As Figures 14-16 shown, it further includes a material guiding mechanism 11. The material guiding mechanism 11 includes a material guiding plate 111, a fixed cross bar 112, a limiting short frame 113, a limiting cam 114, a reset guiding frame 115, and a buffer spring 116. The upper middle part of the filter bottom cylinder 1 is rotatably connected with a fixed cross bar 112. A material guiding plate 111 is fixedly connected to the middle part of the fixed cross bar 112. The material guiding plate 111 can further evenly guide the precipitant. The lower left side of the feeding box 6 is rotatably connected with a limiting short frame 113. The limiting short frame 113 is in belt transmission with the fixed cross bar 112. A limiting cam 114 is fixedly connected to the middle part of the reversing shaft 81. The limiting cam 114 contacts the limiting short frame 113. A reset guiding frame 115 is fixedly connected to the lower part of the outer left side of the feeding box 6. The reset guiding frame 115 is slidably connected with the limiting short frame 113. Two buffer springs 116 are connected between the front part of the limiting short frame 113 and the left part of the reset guiding frame 115.

[0048] When the servo motor 71 works, the material distribution roller 84 rotates forward to drive the driving missing gear 91 to rotate forward. The driving missing gear 91 rotates forward and meshes with the driven gear 92. The driving missing gear 91 rotates forward to drive the driven gear 92 to rotate in reverse. The driven gear 92 rotates in reverse to drive the positioning belt assembly 93 to rotate in reverse. The positioning belt assembly 93 rotates in reverse to drive the feeding rubber plate 94 to move leftward. The reset spring 95 is stretched, and the feeding rubber plate 94 moves leftward and slides in the electromagnetic guide rail 96. Subsequently, the driving missing gear 91 continues to rotate forward and disengages from the driven gear 92. The electromagnetic guide rail 96 will adsorb the feeding rubber plate 94. Then, the feeding rubber plate 94 moves leftward to the maximum stroke and disengages from the electromagnetic guide rail 96. Due to the action of the reset spring 95, the feeding rubber plate 94 moves rightward to reset and evenly dial the precipitant into the filter bottom cylinder 1. After all the wastewater has settled and been filtered, the servo motor 71 is turned off, and the material distribution roller 84 stops driving the driving missing gear 91 to rotate forward. The positioning belt assembly 93 also stops rotating in reverse. In this way, the precipitant can be evenly dropped.

[0049] After the wastewater precipitation and filtration are completed, the diversion ball valve frames 106 on both the front and rear sides block the water outlet pipe 4. The feeding rubber plate 94 moves leftward to the maximum stroke and disengages from the electromagnetic guide rail 96. Due to the action of the return spring 95, the feeding rubber plate 94 moves rightward to reset, causing the positioning side plate 101 to move downward. The positioning spring 103 is stretched. The downward movement of the positioning side plate 101 drives the limit circular seat 104 to swing downward. The downward swing of the limit circular seat 104 drives the positioning connecting shaft 105 to reverse. The reverse rotation of the positioning connecting shaft 105 drives the diversion ball valve frames 106 on both the front and rear sides to reverse. The reverse rotation of the diversion ball valve frames 106 on both the front and rear sides stops blocking the water outlet pipe 4, and the treated wastewater is discharged through the water outlet pipe 4. Subsequently, the feeding rubber plate 94 continues to move leftward along the electromagnetic guide rail 96. The feeding rubber plate 94 disengages from the positioning side plate 101. Due to the action of the positioning spring 103, the positioning side plate 101 drives the positioning connecting shaft 105 to rotate forward and reset through the limit circular seat 104. The forward rotation and reset of the diversion ball valve frames 106 on both the front and rear sides block the water outlet pipe 4. In this way, it is possible to prevent the untreated wastewater from being discharged.

[0050] When the servo motor 71 operates, the reversing shaft 81 rotates forward, driving the limit cam 114 to rotate forward. The forward rotation of the limit cam 114 drives the limit short frame 113 to swing up and down. The buffer spring 116 plays a buffering role. The up and down swing of the limit short frame 113 drives the fixed cross bar 112 to rotate forward and backward through belt transmission. The forward and backward rotation of the fixed cross bar 112 drives the guide plate 111 to swing back and forth. The back and forth swing of the guide plate 111 makes the precipitant be discharged into the wastewater more evenly. After all the wastewater has settled and been filtered, the servo motor 71 is turned off, and the reversing shaft 81 stops driving the limit short frame 113 to swing up and down through the limit cam 114, and the guide plate 111 also stops swinging back and forth. In this way, it is possible to further add the precipitant into the wastewater.

[0051] Embodiment 3

[0052] Based on Embodiment 1 and Embodiment 2, as Figure 14 and Figure 17 shown, it further includes a filtrate mechanism 12. The filtrate mechanism 12 includes an installation cover 121 and a filter plate 122. The installation cover 121 is connected to the water inlet pipe 3. Two filter plates 122 are fixedly connected inside the installation cover 121. The filter plate 122 can preliminarily filter the sewage.

[0053] First, the operator connects the external pipeline of the installation cover 121. Subsequently, the wastewater is discharged into the filter bottom cylinder 1 through the water inlet pipe 3. The filter plate 122 can preliminarily filter the wastewater, facilitating subsequent treatment. In this way, the wastewater can be preliminarily filtered.

[0054] The technical principles of the embodiments of the present invention have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention and cannot be construed in any way as a limitation on the protection scope of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can readily conceive of other specific implementation manners of the embodiments of the present invention without creative efforts, and these manners will all fall within the protection scope of the embodiments of the present invention.

Claims

1. A sedimentation and filtration device for urban wastewater treatment, comprising a filter bottom cylinder (1), a support bottom frame (2), a water inlet pipe (3), a water outlet pipe (4), a filter mesh cover (5), a feed box (6) and a feed conduit (61). The lower part of the outer wall of the filter bottom cylinder (1) is fixedly connected with the support bottom frame (2). The upper side of the left part of the filter bottom cylinder (1) is connected with the water inlet pipe (3). The lower side of the right part of the filter bottom cylinder (1) is connected with the water outlet pipe (4). A filter mesh cover (5) is fixedly connected inside the filter bottom cylinder (1). The outer top wall of the filter bottom cylinder (1) is fixedly connected with the feed box (6). The middle of the upper part of the filter bottom cylinder (1) is connected with the feed conduit (61), and the feed conduit (61) is communicated with the feed box (6). It is characterized in that, It further includes a stirring mechanism (7) and a feeding mechanism (8). A stirring mechanism (7) for stirring the precipitant and the wastewater is arranged on the filtering bottom cylinder (1). A feeding mechanism (8) for discharging the precipitant is arranged between the stirring mechanism (7) and the feeding box (6). The feeding mechanism (8) includes a reversing shaft (81), a fixed cover (82), reversing bevel gears (83) and a material distributing roller (84). A fixed cover (82) is fixedly connected to the lower rear side of the left part of the feeding box (6). A reversing shaft (81) is rotatably connected to the fixed cover (82). The reversing shaft (81) is in belt transmission with the driving shaft (72). A material distributing roller (84) is rotatably connected to the lower side of the left part of the feeding box (6). Reversing bevel gears (83) are fixedly connected to the rear part of the material distributing roller (84) and the right part of the reversing shaft (81). The two reversing bevel gears (83) are meshed with each other. It further includes a material dialing mechanism (9) for uniformly introducing the precipitant. The material dialing mechanism (9) includes a driving missing gear (91), a driven gear (92), a positioning belt assembly (93), a material dialing rubber plate (94), a return spring (95) and an electromagnetic guide rail (96). A driving missing gear (91) is fixedly connected to the front part of the material distributing roller (84). A positioning belt assembly (93) is rotatably connected to the lower part of the feeding box (6). The positioning belt assembly (93) is composed of two belt pulleys and a belt. The two belt pulleys are respectively rotatably installed at the lower part of the feeding box (6). The belt is wound between the two belt pulleys. A driven gear (92) is fixedly connected to the front side of the left part of the positioning belt assembly (93). The driving missing gear (91) can be meshed with the driven gear (92) when rotating. A material dialing rubber plate (94) is fixedly connected to the positioning belt assembly (93). A return spring (95) is connected between the rear part of the material dialing rubber plate (94) and the inner side surface of the feeding box (6). An electromagnetic guide rail (96) is fixedly connected to the lower rear side of the feeding box (6). The electromagnetic guide rail (96) is slidably connected to the material dialing rubber plate (94). It further includes a material guiding mechanism (11) for further uniformly introducing the precipitant. The material guiding mechanism (11) includes a material guiding plate (111), a fixed cross bar (112), a limiting short frame (113), a limiting cam (114), a return guiding frame (115) and a buffer spring (116). A fixed cross bar (112) is rotatably connected to the middle of the upper part of the filtering bottom cylinder (1). A material guiding plate (111) for further uniformly introducing the precipitant is fixedly connected to the middle of the fixed cross bar (112). A limiting short frame (113) is rotatably connected to the lower side of the left part of the feeding box (6). The limiting short frame (113) is in belt transmission with the fixed cross bar (112). A limiting cam (114) is fixedly connected to the middle of the reversing shaft (81). The limiting cam (114) contacts the limiting short frame (113). A return guiding frame (115) is fixedly connected to the lower part of the outer left side surface of the feeding box (6). The return guiding frame (115) is slidably connected to the limiting short frame (113). Two buffer springs (116) are connected between the front part of the limiting short frame (113) and the left part of the return guiding frame (115). The stirring mechanism (7) includes a servo motor (71), a drive shaft (72) and a stirring spiral plate (73). The servo motor (71) is fixedly connected to the middle of the outer left side of the filter bottom cylinder (1). The drive shaft (72) is rotatably connected to the middle of the filter bottom cylinder (1). The left end of the drive shaft (72) is fixedly connected to the output shaft of the servo motor (71). The stirring spiral plate (73) is fixedly connected to the middle of the output shaft. First, the operator externally connects the water inlet pipe and the water outlet pipe to the pipeline respectively, and then pours an appropriate amount of precipitant into the feed box. The distributing roller limits the precipitant. The wastewater is discharged into the filter bottom cylinder through the water inlet pipe. The servo motor is started. The servo motor drives the drive shaft to rotate forward. The forward rotation of the drive shaft drives the reversing shaft to rotate forward through belt transmission. The forward rotation of the reversing shaft drives the distributing roller to rotate forward through two reversing bevel gears. The forward rotation of the distributing roller causes the precipitant to intermittently drain into the filter bottom cylinder from the feed conduit. At the same time, the forward rotation of the drive shaft also drives the stirring spiral plate to rotate forward. The forward rotation of the stirring spiral plate stirs the wastewater and the precipitant. The precipitant and the wastewater are mixed and purified. The anti-slip rubber sleeve can better shock-absorb the device. Subsequently, the treated wastewater is discharged through the water outlet pipe. The filter mesh cover can filter the impurities in the wastewater. When the servo motor works, the forward rotation of the distributing roller drives the driving missing gear to rotate forward. The forward rotation of the driving missing gear meshes with the driven gear. The forward rotation of the driving missing gear drives the driven gear to rotate reversely. The reverse rotation of the driven gear drives the positioning belt assembly to rotate reversely. The reverse rotation of the positioning belt assembly drives the feeding rubber plate to move leftward. The return spring is stretched. And the feeding rubber plate slides leftward in the electromagnetic guide rail. Subsequently, the driving missing gear continues to rotate forward and disengages from the driven gear. The electromagnetic guide rail will adsorb the feeding rubber plate. Then the feeding rubber plate moves leftward to the maximum stroke and disengages from the electromagnetic guide rail. Due to the action of the return spring, the feeding rubber plate moves rightward to reset and evenly dial the precipitant into the filter bottom cylinder. After all the wastewater has settled and been filtered, the servo motor is turned off. The distributing roller stops driving the driving missing gear to rotate forward, and the positioning belt assembly also stops rotating reversely. In this way, the precipitant can be evenly dropped. When the servo motor works, the forward rotation of the reversing shaft drives the limiting cam to rotate forward. The forward rotation of the limiting cam drives the limiting short frame to swing up and down. The buffer spring plays a buffering role. The up and down swing of the limiting short frame drives the fixed cross bar to rotate forward and backward through belt transmission. The forward and backward rotation of the fixed cross bar drives the guide plate to swing back and forth. The back and forth swing of the guide plate makes the precipitant drain into the wastewater more evenly. After all the wastewater has settled and been filtered, the servo motor is turned off. The reversing shaft stops driving the limiting short frame to swing up and down through the limiting cam, and the guide plate also stops swinging back and forth. In this way, the addition of the precipitant into the wastewater can be further facilitated.

2. A sedimentation and filtration device for urban wastewater treatment according to claim 1, wherein It further includes a liquid discharging mechanism (10) for intermittent liquid discharging. The liquid discharging mechanism (10) includes a positioning side plate (101), a positioning guide rod (102), a positioning spring (103), a limiting circular seat (104), a positioning connecting shaft (105) and a diversion ball valve frame (106). The positioning guide rods (102) are symmetrically and fixedly connected to the upper part of the outer wall of the rear of the filter bottom cylinder (1) on the left and right. A positioning side plate (101) is slidably connected between the positioning guide rods (102) on the left and right. The feeding rubber plate (94) contacts the positioning side plate (101). Two positioning springs (103) are connected between the positioning guide rods (102) on the left and right and the top of the positioning side plate (101). The left part of the water outlet pipe (4) is rotatably connected to a positioning connecting shaft (105). The diversion ball valve frames (106) are fixedly connected to the front and rear sides of the positioning connecting shaft (105). The diversion ball valve frame (106) can control the flow of the water outlet pipe (4). The limiting circular seat (104) is fixedly connected to the rear part of the positioning connecting shaft (105). The limiting circular seat (104) is slidably connected to the positioning side plate (101).

3. A sedimentation and filtration device for urban wastewater treatment according to claim 2, characterized in that, It further includes a filtrate mechanism (12) for preliminary filtration of sewage. The filtrate mechanism (12) includes a mounting cover (121) and a filter plate (122). The mounting cover (121) is connected to the water inlet pipe (3). Two filter plates (122) for preliminary filtration of sewage are fixedly connected inside the mounting cover (121).

4. A sedimentation and filtration device for urban wastewater treatment according to claim 3, characterized in that, It further includes anti-slip rubber sleeves (21). Four anti-slip rubber sleeves (21) are fixedly connected at intervals to the lower part of the support chassis (2).

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