Primary filtering device for sewage treatment

Abstract

The invention discloses a primary filtering device for sewage treatment, and relates to the technical field of sewage filtering treatment.The primary filtering device comprises a treatment bin, a driving motor is installed above the treatment bin, the left side and the right side of the treatment bin are communicated with conveying pipes, the lower portion of the treatment bin is communicated with a discharging pipe, and a flexible protection mechanism is arranged at the output shaft end of the driving motor; according to the sewage treatment device, the flow mixing cylinder is used for forming a flow dividing acceleration treatment for circular flow in the treatment bin, and pollutants in sewage are effectively and uniformly mixed through combination of sewage bending flow and an impact effect, so that contact and reaction between reaction substances are promoted, and the sewage treatment effect is improved. The turbulence degree of the sewage in the treatment process is enhanced through the cyclically performed accelerated dynamic change, and the impact effect and the accelerated flowing speed are matched, so that the kinetic energy of the flowing of the sewage is increased, the collision and coalescence of pollutant particles are promoted, and the sewage treatment effect is improved. Therefore, impurities such as solid particles or metal particles and the like in the sewage can be separated from liquid more quickly.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage filtration treatment, and specifically relates to a primary filtration device for sewage treatment. Background Art

[0002] The primary filtration device plays a crucial role in the sewage treatment process. Its core function is to effectively remove larger suspended solids and floating objects in the sewage. Through this pretreatment step, the workload of subsequent treatment units is reduced. It should be noted that this device is not only limited to treating soluble suspended solid impurities in sewage, but also has the ability to specifically treat sewage containing metal impurities, achieving the effective centralized collection of metal impurities.

[0003] However, the following defects still exist in the specific use compared with the prior art: 1. In the prior art, since the paddle stirring rod and the motor output shaft are rigidly connected as a whole, the stirring rod will be affected by inertial force and external resistance during operation, resulting in large torsional force and impact force at the connection between the two, making the motor output shaft and its related components prone to wear. Long-term wear will reduce the service life of the motor and increase the maintenance cost. Moreover, when the stirring rod is subjected to external torque or uneven load during operation, it will cause unstable rotation of the motor output shaft, resulting in speed fluctuations, increased vibration, and even noise and damage to the equipment. Unstable rotation will affect the normal operation and stirring effect of the equipment, and at the same time increase the difficulty of equipment maintenance and repair.

[0004] 2. And in the prior art, continuous stirring is ensured by using a stirring shaft and a propeller blade to mix and treat the sewage. During the stirring process, the stirring shaft and the propeller blade will be hindered by both the sewage and the residual solid particles, resulting in an increase in the resistance of the stirring rotation. Especially when treating industrial sewage containing a large amount of solid particles or metal particle impurities, it is more likely to cause great stirring hindrance and affect the stirring effect. The design and cooperation of these components are all located inside the sewage treatment equipment, greatly increasing the space occupied by the components inside the equipment, which is not conducive to the compact design and space optimization of the equipment, and at the same time makes the maintenance and repair work difficult, increasing the maintenance cost and time.

[0005] 3. At the same time, the prior art usually uses a filter screen to intercept solid suspended matters in the waste liquid, and the pore size is often determined according to the size of the waste particles to be intercepted. Since the size and volume of the metal particle impurities in the waste liquid are not large, these metal particles will pass through the filter screen together with the waste liquid and cannot be effectively intercepted. Even with the propeller blades of the stirring shaft, they can only push the waste suspended matters intercepted by the filter screen to the collection area, but they do not have the function of selectively separating metal particles. Therefore, after the sewage is discharged, additional steps are required to further separate and filter the metal particle impurities therein.

[0006] In view of this, the present invention proposes a primary filtration device for sewage treatment to make up for and improve the deficiencies of the prior art. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides a primary filtration device for sewage treatment to solve the technical problems raised in the above background art.

[0008] To achieve the above object, the technical solution adopted by the present invention is: a primary filtration device for sewage treatment, including a treatment chamber, a support bracket is installed outside the treatment chamber, a driving motor is installed above the treatment chamber, conveying pipes are communicated on the left and right sides of the treatment chamber, a discharge pipe is communicated below the treatment chamber, a flexible protection mechanism is arranged at the output shaft end of the driving motor, a flow velocity strain mixing mechanism is arranged inside the treatment chamber, and a double-layer filtration mechanism is arranged below the flow velocity strain mixing mechanism; It further includes: The flexible protection mechanism is used to reduce the force transmission resistance between structures; The flow velocity strain mixing mechanism is used to circularly mix and process the discharged sewage; The double-layer filtration mechanism is used to multi-level filter and collect impurities in the sewage.

[0009] Further, the flexible protection mechanism includes an adaptation groove fixedly connected to the output shaft end of the driving motor, elastic cables are uniformly fixedly connected to the lower surface of the adaptation groove, one end of the elastic cable far from the adaptation groove is fixedly connected to a base, a stress clamping ring is slidably connected to the upper surface of the base, and a spring is installed inside the stress clamping ring.

[0010] Further, the elastic cable is composed of no less than six polyester ropes, and the elastic cable is in an overall relaxed state.

[0011] Further, the base is of a telescopic structure, the adaptation groove and the stress clamping ring are initially meshed with each other in a staggered shape, the upper end of the spring is fixedly connected to the adaptation groove, and the lower end of the spring is rotatably connected to the base.

[0012] Furthermore, the flow velocity strain mixing mechanism includes a cylindrical shaft fixedly connected to the lower surface of the base. The outer wall of the cylindrical shaft is uniformly and fixedly connected with limiting rings. Symmetrically and fixedly connected to the outer walls of the limiting rings are diversion short plates. A mixing cylinder is installed outside the cylindrical shaft. The inner side wall of the mixing cylinder is uniformly and symmetrically fixedly connected with diversion long plates.

[0013] Furthermore, the bottom of the mixing cylinder is in a contracted conical shape, and the upper part is in a smooth cylindrical shape. The widths of the diversion short plates and the diversion long plates are equal. The length of the diversion short plates is one-half of the length of the diversion long plates, and the diversion short plates and the diversion long plates are distributed in a parallel inclined form.

[0014] Furthermore, the double-layer filtering mechanism includes a converging frame fixedly connected to the inner side wall of the processing chamber. A sealed chamber is installed below the converging frame. Barrier frames are installed on the upper surface of the sealed chamber and the inner side wall of the converging frame. A storage shell is fixedly connected to the inner wall of the sealed chamber. A suction sheet is rotatably connected to the inner side wall of the storage shell.

[0015] Furthermore, the converging frame is specifically composed of two funnel rings spliced together, and is in a shape that expands on both the upper and lower sides and contracts in the middle. The converging frame is rotatably connected to the mixing cylinder. The barrier frame is integrally composed of two rows of inclined layers, and the two rows of inclined layers are arranged vertically and perpendicularly in the same vertical plane.

[0016] Furthermore, the suction sheet is integrally made of a permanent magnet material. The overall size of the storage shell is adapted to the suction sheet. The storage shells are initially all located directly above the suction sheet. The storage shell is specifically made of iron material.

[0017] Furthermore, a rotating rod is fixedly connected to the outer wall of the suction sheet. The processing chamber is rotatably connected to the rotating rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are: (1) In order to solve the problem of drive wear in the prior art, the device adopts an engagement connection between the adaptation groove and the stress snap ring, realizes a multi-point uniform distribution of torque, effectively reduces the load at the end of the motor output shaft, and reduces the loss in the energy transmission process. Compared with the rigid integral connection between the traditional stirring shaft and the motor output shaft, this design reduces unnecessary sliding and friction by reducing the additional torque force required for the motor to overcome the loss, thereby providing a more stable force transmission connection method and enhancing the anti-torque ability of the output shaft. Even when encountering the resistance of solid raw materials during the stirring process, the output shaft can maintain a good torque transmission efficiency, avoiding the impact of a sudden increase in torque on the motor output shaft. (2)To solve the problem of the operating stability of the existing technology, the present device introduces an elastic cable and a spring to make the two cooperate doubly. First, when the elastic cable is in a twisted and taut state, the gap between the matching groove and the stress retaining ring is reduced, thus ensuring the tight and stable engagement between the two, avoiding loosening and instability during the stirring process. At the same time, relying on the elastic characteristics of the elastic cable, it can absorb and mitigate the vibration generated when the solid raw material contacts the stirring shaft, thereby protecting the drive motor from vibration damage. Second, when the operation stops, the reverse force of the spring can re-separate the groove ring and the convex block ring, thereby helping the device to quickly reset. And the pre-tightening force of the spring ensures the position limitation of the groove ring and the convex block ring, enabling the two to engage quickly and accurately every time it starts, thus improving the response speed and stirring efficiency of the device.

[0019] (3)The present device uses a mixing cylinder to form a circulating flow and acceleration treatment inside the treatment chamber. Through the combination of the curved flow and impact effect of the sewage, the pollutants in the sewage are effectively and evenly mixed, promoting the contact and reaction between the reaction substances. And this recyclable acceleration dynamic change enhances the turbulence degree of the sewage during the treatment process. Combined with the impact effect and the increased flow velocity, it further increases the kinetic energy of the sewage's own flow, promoting the collision and coalescence of pollutant particles, and thus separating the impurities such as solid particles or metal particles in the sewage from the liquid more quickly.

[0020] (4)By optimizing the internal structure of the equipment, the present device realizes the reasonable utilization of the sewage treatment space. Compared with the traditional design of the stirring shaft and the propeller blade, which often occupies a large internal space of the equipment, the design of the mixing cylinder's shunt acceleration treatment can, while ensuring the treatment effect, reduce the occupied space of the internal components, making the equipment structure more compact, and enabling the maintenance personnel to more conveniently access the internal components of the equipment for repair or replacement. In addition, relying on the smooth outer wall of the mixing cylinder, the frictional resistance with the sewage is significantly reduced, thereby reducing the energy requirement during the rotation process, improving the mechanical stability and operation smoothness of the equipment, and reducing the equipment wear and maintenance cost caused by vibration.

[0021] (5)Through the shape design of the gathering frame that expands upward and downward and contracts in the middle, it provides an efficient guiding and capturing function for the impurity pollutants. This shape characteristic not only increases the contact area between the pollutants and the inner wall of the gathering frame, but also promotes the impurities to slide downward along its inclined outer wall through fluid guidance, reducing the random floating and diffusion of the pollutants, and effectively avoiding the problem that the pollutants are easily re-suspended in traditional sewage treatment.

[0022] (6) When the impurity pollutants are subjected to a rotational force and tend to float upward, the double limiting effect of the staggered distribution of the blocking frames and the narrow shape in the middle of the gathering frame increases the resistance and complexity of the impurity flow, prompting more eddies and disturbances to occur when the impurities follow the sewage flow. This increases the limiting effect on the impurity pollutants, effectively preventing the collected pollutants from floating upward again, and achieving efficient secondary capture and centralized collection.

[0023] (7) This device continuously adsorbs metal particles in the waste liquid by using magnetic force, ensuring that these particles can always stay on the surface of the sealed chamber, achieving effective interception and separation of the metal particles. This not only improves the separation efficiency of metal particle impurities in sewage filtration, but also reduces subsequent treatment steps. At the same time, it avoids secondary pollution to the environment caused by their discharge with the waste liquid. After completing the double separation and filtration of the impurity pollutants, it also prevents damage and blockage to the equipment during the discharge process. Description of the Drawings

[0024] Figure 1 is the front view three-dimensional structure schematic diagram of the present invention; Figure 2 is the three-dimensional structure schematic diagram of the flexible protection mechanism of the present invention; Figure 3 is the exploded view of the flexible protection mechanism of the present invention; Figure 4 is the three-dimensional structure schematic diagram of the flow velocity strain mixing mechanism of the present invention; Figure 5 of the present invention Figure 4 is the enlarged three-dimensional structure schematic diagram of the local part at A in the present invention; Figure 6 is the three-dimensional structure schematic diagram of the gathering frame component of the present invention; Figure 7 is the three-dimensional structure schematic diagram of the double-layer filtering mechanism of the present invention; Figure 8 is the exploded view of the double-layer filtering mechanism of the present invention; Figure 9 of the present invention Figure 8 is the enlarged three-dimensional structure schematic diagram of the local part at B in the present invention.

[0025] The reference numerals in the figures are: 1, treatment chamber; 11, support bracket; 12, drive motor; 2, flexible protection mechanism; 21, adaptation groove; 22, elastic cable; 23, base; 24, stress retaining ring; 25, spring; 3, flow velocity strain mixing mechanism; 31, cylindrical shaft; 32, limiting ring; 33, shunt short plate; 34, mixing cylinder; 35, shunt long plate; 4, double-layer filtering mechanism; 41, gathering frame; 42, sealed chamber; 43, blocking frame; 44, storage shell; 45, adsorption sheet. Specific Embodiments

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiments of the present invention: Please refer to Figure 1 As shown in the figure, a primary filtration device for sewage treatment includes a treatment tank 1. A support bracket 11 is installed outside the treatment tank 1. A driving motor 12 is installed above the treatment tank 1. Conveying pipes are connected to both the left and right sides of the treatment tank 1. A discharge pipe is connected to the lower part of the treatment tank 1. A flexible protection mechanism 2 is provided at the output shaft end of the driving motor 12. A flow velocity strain mixing mechanism 3 is arranged inside the treatment tank 1. A double-layer filtration mechanism 4 is arranged below the flow velocity strain mixing mechanism 3.

[0028] Please refer to Figures 2 - 3 As shown in the figure, the flexible protection mechanism 2 includes an adaptation groove 21 fixedly connected to the output shaft end of the driving motor 12. Elastic cables 22 are evenly and fixedly connected to the lower surface of the adaptation groove 21. One end of the elastic cable 22 far from the adaptation groove 21 is fixedly connected to a base 23. A stress clamping ring 24 is slidably connected to the upper surface of the base 23. A spring 25 is installed inside the stress clamping ring 24. The elastic cable 22 is composed of no less than six polyester ropes, and the elastic cable 22 is in an overall relaxed state. The base 23 is of a telescopic structure. The adaptation groove 21 and the stress clamping ring 24 are initially meshed with each other in a staggered shape, and the upper end of the spring 25 is fixedly connected to the adaptation groove 21, and the lower end of the spring 25 is rotatably connected to the base 23.

[0029] Specifically, the device adopts a meshing connection between the adaptation groove 21 and the stress clamping ring 24, realizes a multi-point uniform distribution of torque, effectively reduces the load at the output shaft end of the driving motor 12, reduces the loss during the energy transmission process, and at the same time reduces unnecessary sliding and friction, and reduces the additional torque force required for the driving motor 12 to overcome the loss.

[0030] Please refer to Figures 4 - 6As shown in the figure, the flow velocity strain mixing mechanism 3 includes a cylindrical shaft 31 fixedly connected to the lower surface of the base 23. The outer wall of the cylindrical shaft 31 is uniformly and fixedly connected with limiting rings 32. The outer walls of the limiting rings 32 are symmetrically and fixedly connected with diversion short plates 33. A mixing cylinder 34 is installed outside the cylindrical shaft 31. The inner side wall of the mixing cylinder 34 is uniformly and symmetrically fixedly connected with diversion long plates 35. The bottom of the mixing cylinder 34 is in a contracted conical shape, and the upper part is in a smooth cylindrical shape. The widths of the diversion short plates 33 and the diversion long plates 35 are equal. The length of the diversion short plates 33 is half of the length of the diversion long plates 35, and the diversion short plates 33 and the diversion long plates 35 are distributed in a parallel inclined form.

[0031] Specifically, the device uses the mixing cylinder 34 to form a shunt acceleration process with circulating flow inside the treatment chamber 1. Through the combination of the bending flow and impact effect of sewage, the pollutants in the sewage are effectively and evenly mixed, promoting the contact and reaction between reaction substances. And this recyclable acceleration dynamic change enhances the turbulence degree of sewage during the treatment process.

[0032] Please refer to Figures 7 - 9 As shown in the figure, the double-layer filtering mechanism 4 includes a gathering frame 41 fixedly connected to the inner side wall of the treatment chamber 1. A sealing chamber 42 is installed below the gathering frame 41. Barrier frames 43 are installed on the upper surface of the sealing chamber 42 and the inner side wall of the gathering frame 41. A storage shell 44 is fixedly connected to the inner wall of the sealing chamber 42. An adsorption sheet 45 is rotatably connected to the inner side wall of the storage shell 44. The gathering frame 41 is specifically composed of two funnel rings spliced together, and is in a shape that expands on both the upper and lower sides and contracts in the middle. The gathering frame 41 is rotatably connected to the mixing cylinder 34. The barrier frame 43 is composed of two rows of inclined layers combined, and the two rows of inclined layers are placed vertically in the same vertical plane. The adsorption sheet 45 is made of permanent magnet material as a whole. The overall size of the storage shell 44 is adapted to the adsorption sheet 45. The storage shells 44 are initially located directly above the adsorption sheet 45. The storage shell 44 is made of iron material as a whole. A rotating rod is fixedly connected to the outer wall of the adsorption sheet 45, and the treatment chamber 1 is rotatably connected to the rotating rod.

[0033] Specifically, through the shape design of the gathering frame 41 that expands on the upper and lower sides and contracts in the middle, it provides an efficient guiding and capturing function for impurity pollutants. This shape characteristic not only increases the contact area between the pollutants and the inner wall of the gathering frame 41, but also promotes the impurities to slide down along its inclined outer wall through fluid guidance, reducing the random floating and diffusion of pollutants.

[0034] The following are the complete usage steps and working principles of the above embodiments: When the flexible protection mechanism 2 for reducing the force transmission resistance between structures is specifically used: As Figure 2 and Figure 3As shown, since the fitting groove 21 and the stress snap ring 24 are initially in an interleaved meshing state and are movably connected by an elastic cable 22, when the output shaft end of the drive motor 12 rotates, the elastic cable 22 will be synchronously rotated and pulled, and then converted into a torsionally tightened state. During the state conversion of the elastic cable 22, it will drive the base 23 to move upward through its own torsional tightening, thereby promoting the snap fit between the fitting groove 21 and the base 23. Furthermore, it can achieve a uniform distribution of torque at multiple contact points for the force transmission of the output shaft end of the drive motor 12. This meshing connection with multiple points of contact can effectively disperse the torque in space, reduce the torque borne by a single contact point, thus reducing the load on the output shaft end of the drive motor 12. During the stirring process, even when encountering the resistance of solid raw materials, the output shaft can maintain good torque transmission efficiency, avoiding the impact of a sudden increase in torque on the output shaft of the drive motor 12.

[0035] Moreover, during the upward movement of the base 23, the spring 25 will be continuously compressed, converting it into a compressed state. At this time, the tightening and torsion of the elastic cable 22 between the fitting groove 21 and the stress snap ring 24 reduce the connection gap, avoiding the instability caused by loosening and gaps during the stirring process. At the same time, after the drive motor 12 stops running, the spring 25's reverse acting force can be used to re-separate the fitting groove 21 and the stress snap ring 24, thereby helping the device to quickly reset. Additionally, the pre-tightening force of the spring 25 ensures the position limitation of the fitting groove 21 and the stress snap ring 24, enabling them to mesh together quickly and accurately each time the device starts, thus improving the response speed and stirring efficiency of the device.

[0036] When the flow rate strain mixing mechanism 3 for circulating and mixing sewage is specifically used: As Figure 4 and Figure 5As shown in the figure, a vertically connected space is formed inside the treatment chamber 1 by using the mixed-flow cylinder 34, ensuring that the sewage can flow smoothly from top to bottom. When both the mixed-flow cylinder 34 and the cylindrical shaft 31 are rotating, they are relatively stationary. At this time, the sewage inside the mixed-flow cylinder 34 flows from top to bottom. Part of the sewage flows vertically between the limiting rings 32. Since the widths of the diversion short plate 33 and the diversion long plate 35 are equal, and the length of the diversion short plate 33 is half of the length of the diversion long plate 35, and the diversion short plate 33 and the diversion long plate 35 are distributed in a parallel inclined form, another part of the sewage will flow between the diversion short plate 33 and the diversion long plate 35 along their inclined side walls in a curved corner form. According to this different flow mode, the turbulence degree of the sewage is increased to a certain extent, thereby improving the mixing efficiency and reaction contact area between the sewage. When the sewage flowing in a curved manner merges into the sewage flowing vertically downward later, it will impact the vertically flowing sewage and accelerate the flow speed of the sewage, thus forming a faster accelerating flow. At this time, the flow speed of the sewage flowing inside the mixed-flow cylinder 34 is greater than the external flow speed. Under the action of this speed difference and gravity inside the treatment chamber 1, a flow cycle will be formed inside and outside the mixed-flow cylinder 34, continuously inputting sewage from above the mixed-flow cylinder 34 and outputting it from below.

[0037] Compared with the traditional design of the stirring shaft and the propeller blade, which often occupies a large internal space of the equipment, the diversion and acceleration treatment design of the mixed-flow cylinder 34 can reduce the occupied space of the internal components of the treatment chamber 1 while ensuring the treatment effect, making the equipment structure more compact. In addition, relying on the smooth outer wall of the mixed-flow cylinder 34 can significantly reduce the frictional resistance with the sewage, thereby reducing the energy requirement during the rotation process.

[0038] When the double-layer filtering mechanism 4 for multi-level filtering and collecting impurities in sewage is specifically used: As Figure 6 and Figure 7 shown in the figure, a gathering frame 41 is designed at the bottom position of the inner wall of the treatment chamber 1, which is composed of two funnel rings spliced together and has an overall shape of expanding on both the upper and lower sides and contracting in the middle. Therefore, when the above-mentioned sewage flows downward from the mixed-flow cylinder 34, it can slide downward along the inclined outer wall of the gathering frame 41. At this time, it is further combined with a blocking frame 43 composed of two rows of inclined layers as a whole. According to the two rows of inclined layers being placed vertically in the same vertical plane, the resistance and complexity of the impurity flow are increased, prompting more eddies and disturbances to be generated when the impurities follow the sewage flow, thereby increasing the limiting effect on the impurity pollutants and effectively preventing the collected pollutants from floating upward again, realizing efficient secondary capture and centralized collection.

[0039] As Figure 6As shown, a rotating rod is fixedly connected to the outer wall of the adsorption sheet 45, and the treatment chamber 1 is rotatably connected to the rotating rod. Therefore, when using this device for sewage filtration, the staff can rotate the rotating rod in advance to move the adsorption sheet 45 made of permanent magnet material out of the storage shell 44, so as to ensure that the adsorption sheet 45 is in an exposed state and relatively fits on the inner surface of the sealed chamber 42. Therefore, when the above-mentioned impurity pollutants pass through the gathering frame 41 and are above or in contact with the surface of the sealed chamber 42, the metal ions and metal impurities contained therein will be separated from the sewage and adsorbed by the magnetic attraction of the adsorption sheet 45 itself and then remain on the upper surface of the sealed chamber 42, thus reducing the subsequent treatment steps and simultaneously completing the double separation and filtration of the impurity pollutants.

[0040] As Figure 8 and Figure 9 shown, after the sewage treatment operation is completed, the staff can rotate the rotating rod back to its original position. Since the overall size of the storage shell 44 is adapted to the adsorption sheet 45 and the storage shell 44 is specifically made of iron material, when the adsorption sheet 45 moves into the storage shell 44, the storage shell 44 can fully cover the adsorption sheet 45, thus effectively shielding the magnetic field generated by the adsorption sheet 45 and blocking its adsorption ability. At this time, the metal impurities can be discharged and recycled specifically.

[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A primary filtering device for sewage treatment, comprising a treatment chamber (1), a support bracket (11) being installed outside the treatment chamber (1), a drive motor (12) being installed above the treatment chamber (1), a conveying pipe being connected to the left and right sides of the treatment chamber (1), and a discharge pipe being connected to the bottom of the treatment chamber (1), characterized in that: The output shaft end of the driving motor (12) is provided with a flexible protection mechanism (2), the interior of the processing chamber (1) is provided with a flow rate strain mixing mechanism (3), and a double-layer filtering mechanism (4) is provided below the flow rate strain mixing mechanism (3); Also includes: The flexible protection mechanism (2) is used to reduce the force transmission resistance between structures; The flow rate-strain mixing mechanism (3) is used for circulating and mixing the discharged sewage; The double-layer filtering mechanism (4) is used for collecting impurities in sewage through multi-layer filtering.

2. A primary filtration device for sewage treatment according to claim 1, characterized in that: The flexible protection mechanism (2) comprises an adapting groove (21) fixedly connected to the output shaft end of the driving motor (12), an elastic cable (22) being evenly fixedly connected to the lower surface of the adapting groove (21), an end of the elastic cable (22) away from the adapting groove (21) being fixedly connected to a base (23), an upper surface of the base (23) being slidably connected to a stress retaining ring (24), and a spring (25) being installed inside the stress retaining ring (24).

3. A primary filtration device for sewage treatment according to claim 2, characterized in that: The elastic rope (22) is composed of a combination of no less than six polyester ropes, and the elastic rope (22) is in a relaxed state as a whole.

4. A primary filtration device for sewage treatment according to claim 2, characterized in that: The base (23) is a telescopic structure, the adapting groove (21) and the stress clamping ring (24) are initially meshed with each other in a staggered manner, the upper end of the spring (25) is fixedly connected to the adapting groove (21), and the lower end of the spring (25) is rotatably connected to the base (23).

5. A primary filtration device for sewage treatment according to claim 2, characterized in that: The flow rate strain mixing mechanism (3) comprises a cylindrical shaft (31) fixedly connected to the lower surface of the base (23); the outer wall of the cylindrical shaft (31) is evenly fixedly connected to a limit ring (32); the outer wall of the limit ring (32) is symmetrically fixedly connected to a short flow diversion plate (33); a mixing cylinder (34) is installed outside the cylindrical shaft (31); and the inner wall of the mixing cylinder (34) is evenly symmetrically fixedly connected to a long flow diversion plate (35).

6. A primary filtration device for sewage treatment according to claim 5, characterized in that: The bottom of the mixing cylinder (34) is in the shape of a contracting cone, and the top is in the shape of a smooth cylinder. The widths of the short flow diversion plate (33) and the long flow diversion plate (35) are equal, the length of the short flow diversion plate (33) is half the length of the long flow diversion plate (35), and the short flow diversion plate (33) and the long flow diversion plate (35) are arranged in a parallel and inclined manner.

7. A primary filtration device for sewage treatment according to claim 1, characterized in that: The double-layer filtering mechanism (4) comprises a gathering frame (41) fixedly connected to the inner wall of the processing chamber (1); a sealing chamber (42) is installed below the gathering frame (41); a barrier frame (43) is installed on the upper surface of the sealing chamber (42) and the inner wall of the gathering frame (41); a storage shell (44) is fixedly connected to the inner wall of the sealing chamber (42); and an adsorption sheet (45) is rotatably connected to the inner wall of the storage shell (44).

8. A primary filtration device for sewage treatment according to claim 7, characterized in that: The gathering frame (41) is composed of two funnel rings spliced ​​together, and is in an overall shape with expansion on the upper and lower sides and contraction in the middle. The gathering frame (41) is rotatably connected to the mixing cylinder (34). The barrier frame (43) is composed of two rows of inclined layers, and the two rows of inclined layers are located on the same vertical plane and are arranged in a vertical form.

9. A primary filtration device for sewage treatment according to claim 7, characterized in that: The adsorption sheet (45) is entirely made of permanent magnet material, the overall size of the storage shell (44) is compatible with the adsorption sheet (45), the storage shell (44) is initially located directly above the adsorption sheet (45), and the storage shell (44) is made of iron material.

10. A primary filtration device for sewage treatment according to claim 7, characterized in that: The outer wall of the adsorption sheet (45) is fixedly connected to a rotating rod, and the processing chamber (1) is rotatably connected to the rotating rod.

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