An automatic lime dosing device for sewage treatment

Abstract

The invention discloses an automatic lime dosing device for sewage treatment, comprising: a storage box, a material discharge port of the storage box being connected to a feed port of a screw conveyor, a material discharge port of the screw conveyor being connected to a feed port of a mixing box, a sewage inlet pipe being arranged on the side wall of the mixing box, a cylinder being arranged in the mixing box, a plurality of stirring rods being arranged on the outer wall of the cylinder, an air nozzle being arranged at the bottom of the mixing box, a transmission box being arranged at the top of the mixing box, a stirring rod driving assembly and an aeration device being arranged in the transmission box, the stirring rod driving assembly driving the stirring rod to rotate alternately in forward and reverse directions, and to move up and down in a vertical direction, the stirring rod driving assembly driving the aeration device to move, the aeration device conveying air to the air nozzle, and a water outlet pipe being arranged at the bottom of the mixing box. Through the combined action of stirring and bubble impact, vortices and turbulence are easily formed, the deposition of insoluble matter at the bottom of the mixing box is reduced, and the blockage of the water outlet pipe is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an automatic lime dosing device for sewage treatment. Background Art

[0002] With the acceleration of global industrialization and urbanization, sewage treatment has become an important issue for environmental protection and sustainable development. In the sewage treatment process, lime is often added to the sewage in order to adjust the pH value of the water, remove heavy metal ions, precipitate suspended solids, etc. As a commonly used water treatment agent, the effect of lime addition directly affects the treatment quality and cost of sewage. When the existing lime dosing device adds lime to sewage, since lime is a powdery solid, it is not easy to dissolve in sewage, which affects the treatment quality of sewage, and the insoluble matter is easy to precipitate at the bottom of the sewage and block the drainage pipe. Summary of the invention

[0003] Therefore, the present invention aims to solve the problem in the prior art that lime is a powdery solid and is not easily dissolved in sewage, thus affecting the treatment quality of sewage, and insoluble matter is easily precipitated at the bottom of sewage, thus clogging drainage pipes.

[0004] To this end, the technical solution adopted is that an automatic lime dosing device for sewage treatment of the present invention comprises: a storage box, a material discharge port of the storage box is connected with a material feed port of a screw conveyor, the material discharge port of the screw conveyor is connected with a material feed port of a mixing box, a sewage inlet pipe is arranged on the side wall of the mixing box, a cylinder is arranged in the mixing box, a plurality of stirring rods are arranged on the outer wall of the cylinder, an air nozzle is arranged at the bottom end of the mixing box, a transmission box is arranged at the top end of the mixing box, a stirring rod driving assembly and an aeration device are arranged in the transmission box, the stirring rod driving assembly drives the stirring rod to rotate alternately in forward and reverse directions, and move up and down in a vertical direction, the stirring rod driving assembly drives the aeration device to move, the aeration device supplies air to the air nozzle, and a water outlet pipe is arranged at the bottom end of the mixing box.

[0005] Preferably, the stirring rod driving assembly includes: a motor, a motor is arranged on the inner wall of the transmission box, the motor output shaft is coaxially connected to one end of the first rotating shaft, the other end of the first rotating shaft is rotatably connected to the inner wall of the transmission box, a rotating tube is sleeved on the first rotating shaft, the first rotating shaft and the rotating tube are connected by a guide key, two discs are coaxially arranged on the outer wall of the rotating tube, a horizontal roller is arranged between the two discs, the side walls of the discs are in contact with the circumferential outer wall of the roller, the roller is coaxially connected to one end of the screw rod, the screw rod passes through the fixed block and is threadedly connected to the fixed block, the fixed block is connected to the inner wall of the transmission box, the other end of the screw rod is coaxially connected to one end of the second rotating shaft, and the other end of the second rotating shaft extends into the stirring box and is coaxially connected to the top end of the cylinder.

[0006] Preferably, a first bevel gear is coaxially arranged on the first rotating shaft, a convex cylinder is arranged on the outer wall of the rotating tube, an annular groove is arranged on the outer wall of the convex cylinder, a circular ring is sleeved in the annular groove, the circular ring is rotatably connected to the annular groove, one end of the third rotating shaft is rotatably connected to the inner wall of the transmission box, a second bevel gear is coaxially arranged on the other end of the third rotating shaft, the first bevel gear is meshed with the second bevel gear, a first sprocket is coaxially arranged on the third rotating shaft, a fourth rotating shaft is arranged below the second bevel gear, and one end of the fourth rotating shaft is rotatably connected to the inner wall of the transmission box A second sprocket is coaxially arranged on the fourth rotating shaft, the first sprocket is connected to the second sprocket through a chain, the other end of the fourth rotating shaft is connected to one end of the crank, the other end of the crank is hinged to one end of the elastic connecting rod, the other end of the elastic connecting rod is hinged to the rocker, one end of the rocker is hinged to the inner wall of the transmission box, an axial hole is arranged at the other end of the rocker, a spring is arranged in the axial hole, one end of the spring is connected to the bottom wall of the axial hole, the other end of the spring is connected to one end of the telescopic rod, the other end of the telescopic rod is connected to the U-shaped fork, and both ends of the U-shaped fork are hinged to the outer wall of the circular ring.

[0007] Preferably, the rotating tube passes through the support block, and the support block is connected to the inner wall of the transmission box.

[0008] Preferably, the aeration device comprises: a cylinder, a transmission box is provided with a cylinder, a piston is provided in the cylinder, the piston moves up and down in the cylinder, one end of an inlet pipe is connected with the lower end of the cylinder, an inlet check valve is provided on the inlet pipe, one end of an outlet pipe is connected with the lower end of the cylinder, the other end of the outlet pipe is connected with the air nozzle, an outlet check valve is provided on the outlet pipe, a vertical slide rail is provided on the inner wall of the transmission box, a slider is slidably connected to the slide rail, a second rotating shaft passes through the slider and is rotatably connected to the slider, and the slider is connected to the piston by an L-shaped connecting rod.

[0009] Preferably, a sweeping brush is provided at the bottom end of the cylinder, a filter screen is provided below the sweeping brush, and the filter screen is connected to the inner wall of the mixing box.

[0010] Preferably, support rods are provided at the bottom ends of the mixing box and the storage box.

[0011] Preferably, a pH sensor is provided on the inner wall of the mixing box, a PLC controller is provided in the transmission box, the pH sensor is connected to the PLC controller, and the PLC controller is connected to the screw conveyor.

[0012] Preferably, a solenoid valve is provided on the water outlet pipe.

[0013] The technical solution of the present invention has the following advantages: the stirring rod rotates alternately in forward and reverse directions and moves up and down in the vertical direction, which can fully stir the sewage and lime, mix more evenly, and improve the treatment quality of sewage. At the same time, when the stirring rod rotates downward to the bottom of the stirring box, it will drive the aeration device to supply air to the air nozzle, so that the air nozzle sprays bubbles. Through the combined effect of stirring and bubble impact, vortices and turbulence are easily formed, thereby reducing the deposition of insoluble matter at the bottom of the stirring box and avoiding clogging of the water outlet pipe.

[0014] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the internal structure of the transmission box in the present invention;

[0019] Figure 3 yes Figure 2 A magnified image of point A;

[0020] Figure 4 It is a schematic diagram of the connection between the ring and the U-shaped fork in the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the first sprocket, the second sprocket and the chain in the present invention;

[0022] Description of reference numerals:

[0023] 1. Storage box; 2. Screw conveyor; 3. Mixing box; 4. Sewage inlet pipe; 5. Cylinder; 6. Mixing rod; 7. Air nozzle; 8. Transmission box; 9. Mixing rod drive assembly; 10. Aeration device; 11. Outlet pipe; 12. Brush; 13. Filter; 14. Support rod; 15. pH sensor; 16. PLC controller; 100. Cylinder; 101. Piston; 102. Inlet pipe; 103. Inlet check valve; 104. Outlet pipe; 105. Outlet check valve; 106. Slide rail; 107. Sliding block; 108. L-shaped connecting rod; 901. Motor; 902. The first rotating shaft; 903, rotating tube; 904, disc; 905, roller; 906, screw rod; 907, fixing block; 908, second rotating shaft; 909, first bevel gear; 910, convex cylinder; 911, annular groove; 912, circular ring; 913, third rotating shaft; 914, second bevel gear; 915, first sprocket; 916, fourth rotating shaft; 917, second sprocket; 918, chain; 919, crank; 920, elastic connecting rod; 921, rocker; 922, shaft hole; 923, spring; 924, telescopic rod; 925, U-shaped fork; 926, supporting block. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0026] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] The present invention provides an automatic lime dosing device for sewage treatment, such as Figure 1 As shown, it includes: a storage box 1, in which there is stored material, the material outlet of the storage box 1 is connected with the feed inlet of the screw conveyor 2, the material outlet of the screw conveyor 2 is connected with the feed inlet of the mixing box 3, a sewage inlet pipe 4 is arranged on the side wall of the mixing box 3, a cylinder 5 is arranged in the mixing box 3, a plurality of stirring rods 6 are arranged on the outer wall of the cylinder 5, an air nozzle 7 is arranged at the bottom end of the mixing box 3, a transmission box 8 is arranged at the top end of the mixing box 3, a stirring rod driving assembly 9 and an aeration device 10 are arranged in the transmission box 8, the stirring rod driving assembly 9 drives the stirring rod 6 to rotate alternately in forward and reverse directions, and move up and down in the vertical direction, the stirring rod driving assembly 9 drives the aeration device 10 to move, the aeration device 10 supplies air to the air nozzle 7, and a water outlet pipe 11 is arranged at the bottom end of the mixing box 3.

[0029] The working principle and beneficial technical effects of the above technical solution are as follows: sewage flows in through the sewage inlet pipe 4, and the screw conveyor 2 is used to control the amount of lime added. When the lime enters the mixing box 3, the stirring rod 6 rotates alternately in forward and reverse directions and moves up and down in the vertical direction, which can fully stir the sewage and lime, mix more evenly, and improve the treatment quality of sewage. At the same time, when the stirring rod 6 rotates downward to the bottom of the mixing box 3, it will drive the aeration device 10 to supply air to the air nozzle 7, so that the air nozzle 7 sprays bubbles. Through the combined effect of stirring and bubble impact, vortices and turbulence are easily formed, which reduces the deposition of insoluble matter at the bottom of the mixing box 3 and avoids clogging the water outlet pipe.

[0030] In one embodiment, Figure 1-5As shown, the stirring rod driving assembly 9 includes: a motor 901, a motor 901 is arranged on the inner wall of the transmission box 8, the output shaft of the motor 901 is coaxially connected to one end of the first rotating shaft 902, the other end of the first rotating shaft 902 is rotatably connected to the inner wall of the transmission box 8, a rotating tube 903 is sleeved on the first rotating shaft 902, the first rotating shaft 902 and the rotating tube 903 are connected by a guide key, two discs 904 are coaxially arranged on the outer wall of the rotating tube 903, a horizontal roller 905 is arranged between the two discs 904, the side walls of the discs 904 are in contact with the circumferential outer wall of the roller 905, the roller 905 is coaxially connected to one end of the screw rod 906, the screw rod 906 passes through the fixed block 907 and is threadedly connected to the fixed block 907, the fixed block 907 is connected to the inner wall of the transmission box 8, the other end of the screw rod 906 is coaxially connected to one end of the second rotating shaft 908, and the other end of the second rotating shaft 908 extends into the mixing box 3 and is coaxially connected to the top of the cylinder 5.

[0031] A first bevel gear 909 is coaxially arranged on the first rotating shaft 902, a convex cylinder 910 is arranged on the outer wall of the rotating tube 903, an annular groove 911 is arranged on the outer wall of the convex cylinder 910, a circular ring 912 is sleeved in the circular groove 911, and the circular ring 912 is rotatably connected to the circular groove 911, and a third rotating shaft 913 is rotatably connected to the inner wall of the transmission box 8 at one end, and a second bevel gear 914 is coaxially arranged on the other end of the third rotating shaft 913, and the first bevel gear 909 is meshed with the second bevel gear 914, and a first sprocket 915 is coaxially arranged on the third rotating shaft 913, and a fourth rotating shaft 916 is arranged below the second bevel gear 914, and one end of the fourth rotating shaft 916 is rotatably connected to the inner wall of the transmission box 8, and the fourth rotating shaft 916 A second sprocket 917 is coaxially arranged on the upper part, the first sprocket 915 is connected to the second sprocket 917 through a chain 918, the other end of the fourth rotating shaft 916 is connected to one end of a crank 919, the other end of the crank 919 is hinged to one end of an elastic connecting rod 920, the other end of the elastic connecting rod 920 is hinged to a rocker 921, one end of the rocker 921 is hinged to the inner wall of the transmission box 8, the other end of the rocker 921 is provided with an axial hole 922, a spring 923 is arranged in the axial hole 922, one end of the spring 923 is connected to the bottom wall of the axial hole 922, the other end of the spring 923 is connected to one end of a telescopic rod 924, the other end of the telescopic rod 924 is connected to a U-shaped fork 925, and both ends of the U-shaped fork 925 are hinged to the outer wall of the ring 912. The rotating tube 903 passes through the support block 926, and the support block 926 is connected to the inner wall of the transmission box 8.

[0032] The working principle and beneficial technical effects of the above technical solution are as follows: the motor 901 is started to drive the first rotating shaft 902 to rotate, the first rotating shaft 902 drives the rotating tube 903 to rotate, the rotating tube 903 drives the two discs 904 to rotate, and at the same time, the first rotating shaft 902 drives the first bevel gear 909 to rotate, the first bevel gear 909 is meshed with the second bevel gear 914, drives the second bevel gear 914 to rotate, the second bevel gear 914 drives the first sprocket 915 to rotate, and drives the second sprocket 917 to rotate through the chain 918. The second sprocket 917 drives the fourth rotating shaft 916 to rotate, and the fourth rotating shaft 916 drives the crank 919 to rotate. The crank 919, the elastic connecting rod 920 and the rocker 921 form a crank-rocker mechanism, which drives the rocker 921 to swing left and right. The rocker 921 drives the telescopic rod 924 to swing left and right and can be telescoped in the radial direction, thereby driving the ring 912 to move left and right through the U-shaped fork 925. The ring 912 drives the convex cylinder 910 and the rotating tube 903 to move left and right. The two disks 904 can move left and right while rotating. When the right disk 904 contacts with the roller 905, the roller 905 is driven to rotate, and the roller 905 drives the screw rod 906 to rotate. Through the threaded transmission of the screw rod 906 and the fixed block 907, the roller 905 rotates and moves upward continuously. Then, the two disks 904 move to the right, so that the right disk 904 contacts with the roller 905, driving the roller 905 to rotate in the opposite direction. Through the threaded transmission of the screw rod 906 and the fixed block 907, the roller 905 rotates in the opposite direction and moves downward continuously. Therefore, the disk 904 moves up and down continuously, and rotates in a forward and reverse direction alternately, and continuously circulates. Correspondingly, the stirring rod 6 is driven to move up and down continuously, and rotates in a forward and reverse direction alternately, and continuously circulates, so that the sewage and lime are fully stirred, the sewage treatment quality is improved, and the insoluble matter is reduced.

[0033] In one embodiment, Figure 1-5 As shown, the aeration device 10 includes: a cylinder 100, a transmission box 8 is provided with the cylinder 100, a piston 101 is provided in the cylinder 100, the piston 101 moves up and down in the cylinder 100, one end of an air inlet pipe 102 is connected with the lower end of the cylinder 100, an air inlet check valve 103 is provided on the air inlet pipe 102, one end of an air outlet pipe 104 is connected with the lower end of the cylinder 100, the other end of the air outlet pipe 104 is connected with the air nozzle 7, an air outlet check valve 105 is provided on the air outlet pipe 104, a vertical slide rail 106 is provided on the inner wall of the transmission box 8, a slider 107 is slidably connected to the slide rail 106, the second rotating shaft 908 passes through the slider 107 and is rotatably connected to the slider 107, and the slider 107 is connected to the piston 101 through an L-shaped connecting rod 108.

[0034] The working principle and beneficial technical effects of the above technical solution are as follows: the roller 905 and the second rotating shaft 908 continuously move up and down, and rotate alternately in forward and reverse directions, which will drive the slider 107 to move up and down, and drive the piston 101 to move up and down in the cylinder 100. When the piston 101 moves upward, air is sucked into the cylinder 100 from the outside. When the piston 101 moves downward, the air in the cylinder 100 is pressed to the air nozzle 7, so that the stirring rod 6 rotates downward to the bottom of the stirring box 3, and the air nozzle 7 will spray bubbles to stir the sediment at the bottom of the stirring box and impact the air flow, thereby reducing the deposition of dissolved substances and avoiding pipe blockage. When the stirring rod moves upward, it will not spray bubbles, reducing the impact on the sewage discharge flow rate.

[0035] In one embodiment, a sweeping brush 12 is provided at the bottom of the cylinder 5, and a filter screen 13 is provided below the sweeping brush 12. The filter screen 13 is connected to the inner wall of the mixing box 3 to filter large solid particles or foreign matter. The sweeping brush 12 can intermittently clean the filter screen 13 to prevent the filter screen from being blocked. A support rod 14 is provided at the bottom of the mixing box 3 and the storage box 1 to play a supporting role. A pH sensor 15 is provided on the inner wall of the mixing box 3, and a PLC controller 16 is provided in the transmission box 8. The pH sensor 15 is connected to the PLC controller 16, and the PLC controller 16 is connected to the screw conveyor 2. A solenoid valve is provided on the outlet pipe 11 to control the opening or closing of the outlet pipe.

[0036] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An automatic lime dosing device for sewage treatment, characterized in that: include: A material storage box (1), wherein the material storage box (1) has a material outlet connected to a material inlet of a screw conveyor (2), the material outlet of the screw conveyor (2) is connected to a material inlet of a mixing box (3), a sewage inlet pipe (4) is arranged on the side wall of the mixing box (3), a cylinder (5) is arranged inside the mixing box (3), a plurality of stirring rods (6) are arranged on the outer wall of the cylinder (5), an air nozzle (7) is arranged at the bottom end of the mixing box (3), a transmission box (8) is arranged at the top end of the mixing box (3), a stirring rod driving assembly (9) and an aeration device (10) are arranged inside the transmission box (8), the stirring rod driving assembly (9) drives the stirring rod (6) to rotate alternately in forward and reverse directions and move up and down in a vertical direction, the stirring rod driving assembly (9) drives the aeration device (10) to move, the aeration device (10) delivers air to the air nozzle (7), and a water outlet pipe (11) is arranged at the bottom end of the mixing box (3); The stirring rod driving assembly (9) comprises: a motor (901), the motor (901) being arranged on the inner wall of the transmission box (8), the output shaft of the motor (901) being coaxially connected to one end of a first rotating shaft (902), the other end of the first rotating shaft (902) being rotatably connected to the inner wall of the transmission box (8), a rotating tube (903) being sleeved on the first rotating shaft (902), the first rotating shaft (902) and the rotating tube (903) being connected via a guide key, two discs (904) being coaxially arranged on the outer wall of the rotating tube (903), a horizontal roller (905) being arranged between the two discs (904), and the side walls of the discs (904) and the rollers (905) being circumferentially connected to each other. The roller (905) is coaxially connected to one end of the screw rod (906), the screw rod (906) passes through the fixing block (907) and is threadedly connected to the fixing block (907), the fixing block (907) is connected to the inner wall of the transmission box (8), the other end of the screw rod (906) is coaxially connected to one end of the second rotating shaft (908), and the other end of the second rotating shaft (908) extends into the mixing box (3) and is coaxially connected to the top of the cylinder (5); when the right side disc (904) contacts the roller (905), the roller (905) is driven to rotate, and when the left side disc (904) contacts the roller (905), the roller (905) is driven to rotate in the opposite direction; A first bevel gear (909) is coaxially arranged on the first rotating shaft (902), a convex cylinder (910) is arranged on the outer wall of the rotating tube (903), an annular groove (911) is arranged on the outer wall of the convex cylinder (910), a circular ring (912) is sleeved inside the annular groove (911), and the circular ring (912) is rotatably connected to the annular groove (911), one end of the third rotating shaft (913) is rotatably connected to the inner wall of the transmission box (8), a second bevel gear (914) is coaxially arranged on the other end of the third rotating shaft (913), the first bevel gear (909) meshes with the second bevel gear (914), a first sprocket (915) is coaxially arranged on the third rotating shaft (913), a fourth rotating shaft (916) is arranged below the second bevel gear (914), one end of the fourth rotating shaft (916) is rotatably connected to the inner wall of the transmission box (8), and the fourth rotating shaft (916) is rotatably connected to the inner wall of the transmission box (8). A second sprocket (917) is coaxially arranged, the first sprocket (915) and the second sprocket (917) are connected via a chain (918), the other end of the fourth rotating shaft (916) is connected to one end of a crank (919), the other end of the crank (919) is hinged to one end of an elastic connecting rod (920), the other end of the elastic connecting rod (920) is hinged to a rocker (921), one end of the rocker (921) is hinged to the inner wall of a transmission box (8), the other end of the rocker (921) is provided with an axial hole (922), a spring (923) is provided in the axial hole (922), one end of the spring (923) is connected to the bottom wall of the axial hole (922), the other end of the spring (923) is connected to one end of a telescopic rod (924), the other end of the telescopic rod (924) is connected to a U-shaped shift fork (925), and both ends of the U-shaped shift fork (925) are hinged to the outer wall of the circular ring (912).

2. The automatic lime dosing device for sewage treatment according to claim 1, characterized in that: The rotating tube (903) passes through the supporting block (926), and the supporting block (926) is connected to the inner wall of the transmission box (8).

3. The automatic lime dosing device for sewage treatment according to claim 1, characterized in that: The aeration device (10) comprises: a cylinder (100), the cylinder (100) being arranged in a transmission box (8), a piston (101) being arranged in the cylinder (100), the piston (101) moving up and down in the cylinder (100), one end of an air inlet pipe (102) being connected to the lower end of the cylinder (100), an air inlet check valve (103) being arranged on the air inlet pipe (102), one end of an air outlet pipe (104) being connected to the lower end of the cylinder (100), and the air outlet pipe (104) being connected to the lower end of the cylinder (100). The other end of the piston (104) is connected to the air nozzle (7), and an air outlet non-return valve (105) is arranged on the air outlet pipe (104). A vertical slide rail (106) is arranged on the inner wall of the transmission box (8), and a slider (107) is slidably connected to the slide rail (106). The second rotating shaft (908) passes through the slider (107) and is rotatably connected to the slider (107). The slider (107) is connected to the piston (101) via an L-shaped connecting rod (108).

4. The automatic lime dosing device for sewage treatment according to claim 1, characterized in that: A sweeping brush (12) is arranged at the bottom end of the cylinder (5), a filter screen (13) is arranged below the sweeping brush (12), and the filter screen (13) is connected to the inner wall of the mixing box (3).

5. The automatic lime dosing device for sewage treatment according to claim 1, characterized in that: Support rods (14) are provided at the bottom ends of the mixing box (3) and the material storage box (1).

6. The automatic lime dosing device for sewage treatment according to claim 1, characterized in that: A pH sensor (15) is arranged on the inner wall of the mixing box (3), a PLC controller (16) is arranged in the transmission box (8), the pH sensor (15) is connected to the PLC controller (16), and the PLC controller (16) is connected to the screw conveyor (2).

7. The automatic lime dosing device for sewage treatment according to claim 1, characterized in that: A solenoid valve is provided on the water outlet pipe (11).

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