A multi-stage grid cleaning device for sewage pretreatment

Abstract

The utility model discloses a multistage grating decontamination device for sewage pretreatment belongs to sewage treatment equipment technical field, the device includes the chassis, side plate and screening mechanism, its characterized in that still includes cleaning mechanism and crushing mechanism, the cleaning mechanism sets up above screening mechanism, including rolling brush and sprayer, and rolling brush realizes the adjustment of height and contact force through the transmission mechanism of pneumatic cylinder drive, and the screening net board is brushed and is washed, the crushing mechanism sets up below cleaning mechanism, including the contraction hopper for collecting impurity, the crushing roller with cutting knife head and the unloading frame for draining, the utility model solves the problem that the present technology grating sweeps not completely, sweeps the brush utensil wear and tear effect decline, and sweeps the impurity and has not been able to effectively reducing the capacity dehydration, has the beneficial effect of sweeping completely, can compensate brush utensil wear and tear, effectively crushing impurity and reducing the water content, the automation level is high, and the pretreatment efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a multi-stage bar screen cleaning device for wastewater pretreatment. Background Technology

[0002] In the wastewater treatment process, the bar screen is a key piece of equipment in the pretreatment stage. Its main function is to intercept and remove larger suspended solids, floating objects and solid particles in the wastewater to prevent blockage or damage to subsequent pumps, pipes and treatment units, and to ensure the stable operation of the entire wastewater treatment system.

[0003] Existing bar screen cleaning devices typically use fixed toothed rakes or rotating brushes to clean impurities trapped on the screen. However, these devices have revealed some shortcomings in practical applications. When treating wastewater containing a large amount of sticky or fibrous impurities, the fixed-force sweeping method is insufficient to completely remove stubborn stains, easily leading to some impurities remaining. Over time, this accumulation can cause bar screen blockage and affect water flow efficiency. Simultaneously, the sweeping mechanism, such as the brushes, will wear down during use. The fixed installation position cannot compensate for the gaps caused by wear, resulting in a significant decrease in cleaning effectiveness over time. Ultimately, this necessitates frequent downtime for replacement, increasing maintenance costs and workload.

[0004] Furthermore, existing technologies typically focus only on separating impurities from the screen, with the separated screen residue often falling directly into collection containers without treatment. This screen residue is usually large in volume, loosely structured, and has an extremely high moisture content. It not only occupies a significant amount of storage and transportation space, increasing off-site transportation costs, but its moisture content also creates considerable difficulties and additional energy consumption for subsequent disposal processes such as pressing, incineration, or landfilling. This approach of merely removing impurities without volume reduction significantly compromises the economic efficiency and environmental friendliness of the entire solid waste treatment chain.

[0005] Therefore, this utility model proposes a multi-stage bar screen cleaning device for sewage pretreatment to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems existing in the multi-stage bar screen cleaning device for sewage pretreatment, such as insufficient cleaning mechanism for stubborn stains, inability to compensate for wear of cleaning brushes leading to decreased effectiveness, and large volume and high moisture content of the cleaned impurities resulting in high subsequent transportation and treatment costs, this utility model aims to provide a multi-stage bar screen cleaning device for sewage pretreatment with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a multi-stage bar screen for sewage pretreatment, comprising: a base frame, a side plate fixedly connected to the base frame, and a screening mechanism disposed between the base frame and the side plate. The screening mechanism includes a chain and a screening mesh plate connected to the chain. The device also includes a cleaning mechanism disposed above the screening mechanism and a crushing mechanism disposed below the cleaning mechanism.

[0008] The cleaning mechanism includes a cleaning assembly and a flushing assembly. The cleaning assembly includes a roller brush, which is height-adjustable and rotates via a cylinder-driven transmission mechanism. The flushing assembly includes a water pump and nozzles. The crushing mechanism includes a shrink hopper, a crushing assembly, and a discharge rack. The crushing assembly includes a motor and a crushing roller driven by the motor, the outer periphery of which is equipped with cutting blades; the discharge rack has multiple openings.

[0009] Furthermore, the roller brush of the cleaning mechanism and the screening screen of the screening mechanism are combined through an adjustable pressing contact method. The cylinder adjusts the contact force and height between the roller brush and the screening screen by extending and retracting. The nozzle of the rinsing component is located on one side of the area cleaned by the roller brush and is used to spray water onto the screening screen for rinsing. The shrink hopper of the crushing mechanism is located above the crushing component to collect and guide impurities; the crushing component is located below the shrink hopper to cut and crush the impurities; the unloading rack is located below the crushing component to receive the crushed impurities and drain them.

[0010] Preferably, the screening mechanism further includes a motor, a gear shaft, and a material support plate. The motor is connected to the gear shaft for transmission, and the gear shaft drives the chain to rotate in a circular motion. The material support plate is fixedly installed below the screening screen plate to support the screening screen plate.

[0011] Preferably, the cleaning mechanism further includes a top plate located on top of the cleaning mechanism and used to mount the cleaning components and the rinsing components.

[0012] Preferably, the transmission mechanism in the cleaning assembly includes a top frame, a diagonal connecting rod, a fixed frame, a side rotating frame, and a second motor. The top frame is connected to the fixed frame via the diagonal connecting rod, the fixed frame is connected to the cylinder via the side rotating frame, and the second motor is fixedly mounted on the fixed frame and drives the roller brush to rotate.

[0013] Preferably, the crushing mechanism further includes a side guard plate and a crushing frame. The side guard plate is fixedly connected to both sides of the base frame, the crushing frame is fixedly arranged between the side guard plates, and the crushing roller is rotatably arranged on the crushing frame.

[0014] Preferably, the screening mesh plates are arranged at an angle along the conveying direction of the chain, and together they form a continuous, circulating stepped screening surface.

[0015] Preferably, the openings on the unloading rack are of a grid structure to maximize the drainage effect, and the unloading rack is set to a downward slope to facilitate the sliding of impurities.

[0016] Preferably, the crushing roller consists of two rollers arranged in parallel to each other, and the cutting head consists of toothed blades arranged alternately on the rollers. The two rollers rotate in opposite directions to tear and crush impurities.

[0017] This utility model has the following beneficial effects: 1. This utility model, by setting a transmission mechanism for the cylinder-driven roller brush, enables the roller brush to be height-adjustable and rotated to clean the screening screen plate. At the same time, it combines a water pump and a spray nozzle to rinse the screening screen plate, which solves the problem of incomplete cleaning of the screen in the prior art, especially the insufficient ability to handle stubborn stains. It achieves the technical effect of improving cleaning efficiency and thoroughness, compensating for roller brush wear, and extending the service life of the roller brush.

[0018] 2. This utility model, by setting an integrated crushing mechanism and unloading rack below the sweeping mechanism, uses a motor in the crushing mechanism to drive the crushing roller and the cutting head on its outer periphery to crush the swept impurities, while the unloading rack is used to receive and drain the water. This solves the problem in the prior art that the swept garbage cannot be effectively reduced in volume and dehydrated, leading to difficulties in subsequent transportation and processing. It achieves the technical effect of effectively reducing the volume of impurities and the moisture content, thereby significantly reducing transportation costs and the difficulty of subsequent processing.

[0019] 3. This utility model integrates screening, adjustable sweeping, crushing and draining functions into an integrated device, which solves the problems of single function, low degree of automation and low treatment efficiency of traditional bar screen cleaning devices in the prior art. It achieves the technical effect of improving the automation level, operation efficiency and overall treatment effect of sewage pretreatment, and reducing manual intervention and operating costs. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a multi-stage bar screen cleaning device for sewage pretreatment proposed in this utility model; Figure 2 This is a schematic diagram of the screening screen plate of a multi-stage bar screen for wastewater pretreatment proposed in this utility model; Figure 3 This is a schematic diagram of the side rotating frame of a multi-stage bar screen cleaning device for sewage pretreatment proposed in this utility model; Figure 4 This is a schematic diagram of the crushing roller of a multi-stage bar screen cleaning device for sewage pretreatment proposed in this utility model.

[0021] Legend: 1. Base frame; 2. Side panels; 3. Screening mechanism; 31. Motor 1; 32. Gear shaft; 33. Chain; 34. Screening screen plate; 35. Material support plate; 4. Cleaning mechanism; 41. Top plate; 42. Sweeping assembly; 421. Top frame; 422. Diagonal connecting rod; 423. Fixing frame; 424. Side turning frame; 425. Cylinder; 426. Motor II; 427. Roller brush 43. Water pump; 44. Water pipe; 45. Connecting bracket; 46. Sprinkler head; 5. Crushing mechanism; 51. Side guard plate; 52. Crushing assembly; 521. Motor 3; 522. Crushing frame; 523. Crushing roller; 524. Cutting head; 53. Shrink bucket; 54. Unloading rack. Detailed Implementation

[0022] Example

[0023] Please refer to Figures 1 to 4 This utility model provides a multi-stage bar screen cleaning device for sewage pretreatment, which aims to solve the structural defects in the prior art, such as incomplete bar cleaning, insufficient ability to treat stubborn stains, and failure to effectively reduce the volume and dehydrate the cleaned garbage, leading to difficulties in subsequent transportation and treatment.

[0024] like Figure 1 and Figure 2 As shown, the multi-stage bar screen for wastewater pretreatment includes a base frame 1, with side plates 2 fixedly connected to opposite sides of the base frame 1. The base frame 1 and the side plates 2 together form the main support structure of the device, serving as the mounting base and outer frame for the entire device. A screening mechanism 3 is installed in the internal space of the device, specifically in the area formed between the base frame 1 and the side plates 2.

[0025] The screening mechanism 3 is mainly used for the initial interception and separation of solid impurities in wastewater. The screening mechanism 3 includes a chain 33 and multiple screening screens 34 that are cyclically connected and spaced along the length of the chain 33. These screening screens 34 together form a continuously circulating screening surface for intercepting solid impurities in the wastewater. When the device is operating, as wastewater flows through the screening screens 34, solid impurities are intercepted, while the wastewater flows downstream through the screens.

[0026] A cleaning mechanism 4 is positioned above the screening mechanism 3 and is used to automatically clean impurities adhering to the screening screen plate 34. The cleaning mechanism 4 is further divided into a cleaning component 42 and a rinsing component. The cleaning component 42 includes a roller brush 427, which is height-adjustable and rotates via a transmission mechanism driven by a precision cylinder 425 to brush away impurities from the screening screen plate 34. Specifically, the transmission mechanism includes a top frame 421, a diagonal connecting rod 422, a fixed frame 423, a side rotating frame 424, a cylinder 425, and a second motor 426. The top frame 421 is connected to the fixed frame 423 via the diagonal connecting rod 422, and the fixed frame 423 is connected to the cylinder 425 via the side rotating frame 424. The second motor 426 is fixedly mounted on the fixed frame 423 and drives the roller brush 427 to rotate. The telescopic drive of cylinder 425 moves the side rotating frame 424 along a preset track, thereby causing the fixed frame 423 and the roller brush 427 to slide vertically. This adjusts the downward contact force and height of the roller brush 427 with the screening screen 34, ensuring effective cleaning. When cylinder 425 extends, the roller brush 427 is pressed down, increasing the contact force with the screening screen 34 and helping to remove stubborn stains. When the bristles of the roller brush 427 wear down and shorten, cylinder 425 can flexibly adjust the height of the roller brush 427 to maintain effective contact between the roller brush 427 and the screening screen 34, ensuring consistent cleaning results.

[0027] The rinsing assembly includes a water pump 43, a water supply pipe 44, a connecting frame 45, and nozzles 46. The water pump 43 supplies water to the connecting frame 45 through the water supply pipe 44, and multiple nozzles 46 are fixedly connected to the connecting frame 45. These nozzles 46 are located on one side of the area brushed by the roller brush 427. While or after the roller brush 427 is brushing away impurities, the nozzles 46 spray water to rinse the screening screen plate 34, thoroughly washing away the brushed impurities and assisting in completing the cleaning process.

[0028] The crushing mechanism 5 is located below the impurity discharge end of the sweeping mechanism 4, and is used to crush and drain the swept impurities. The crushing mechanism 5 includes a shrink hopper 53, a crushing assembly 52, and a discharge rack 54. The shrink hopper 53 is located above the crushing assembly 52, and its structure is designed to effectively collect and guide impurities from the sweeping mechanism 4 into the crushing assembly 52. ​​The crushing assembly 52 includes a motor 521 and a crushing roller 523 driven by the motor 521. Multiple cutting heads 524 are evenly spaced on the outer circumference of the crushing roller 523. These cutting heads 524 perform simple cutting and crushing of the incoming impurities as the crushing roller 523 rotates, effectively reducing the volume of waste. The discharge rack 54 is fixedly located below the crushing assembly 52 and is used to receive the crushed impurities. The discharge rack 54 has multiple openings for draining the crushed impurities, reducing their moisture content, and facilitating subsequent transportation and processing.

[0029] Please refer to the following carefully. Figure 1 and Figure 3The core structure will be described in detail below: The cleaning mechanism 4 is located above the screening mechanism 3 and is used to periodically clean the screening screen plate 34. The cleaning mechanism 4 includes a top plate 41, which is located on top of the cleaning mechanism 4 and serves as the mounting base for the cleaning assembly 42 and the rinsing assembly.

[0030] The cleaning assembly 42 includes a top frame 421, a diagonal connecting rod 422, a fixed frame 423, a side rotating frame 424, a cylinder 425, a second motor 426, and a roller brush 427. The top frame 421 is fixedly connected to the bottom of the top plate 41. The two ends of the diagonal connecting rod 422 are rotatably connected to the top frame 421 and the fixed frame 423, respectively, forming a swingable support structure. The fixed frame 423 is connected to the cylinder 425 through the side rotating frame 424. The body of the cylinder 425 is fixedly mounted on the internal support structure of the cleaning mechanism 4, and its piston rod extends and retracts to drive the side rotating frame 424 to move horizontally along a preset track. The movement of the side rotating frame 424, through its connection with the fixed frame 423, drives the fixed frame 423 and the roller brush 427 rotatably mounted on it to slide in the up and down direction. The second motor 426 is fixedly mounted on the fixed frame 423, and its output shaft is driven by the roller brush 427, thereby driving the roller brush 427 to rotate.

[0031] During the cleaning process, the cylinder 425 extends and retracts, causing the side rotating frame 424 to move, which in turn moves the fixed frame 423 downward, causing the roller brush 427 to press down against the surface of the screening screen plate 34. Simultaneously, the motor 426 drives the roller brush 427 to rotate, using the bristles of the roller brush 427 to mechanically remove impurities adhering to the screening screen plate 34. This cylinder 425-driven adjustment mechanism ensures that the roller brush 427 maintains effective contact with the screening screen plate 34 at all times. Depending on the stubbornness of the stains, the cylinder 425 can further extend, increasing the downward pressure of the roller brush 427 for more powerful cleaning. Even after prolonged use, when the bristles of the roller brush 427 shorten, the cylinder 425 can flexibly adjust the overall height of the roller brush 427 to compensate for bristle wear, ensuring that the cleaning effect is not affected.

[0032] The rinsing assembly includes a water pump 43, a water supply pipe 44, a connecting frame 45, and nozzles 46. The water pump 43 is fixedly mounted on the base frame 1 and is in fluid communication with the connecting frame 45 through the water supply pipe 44. Multiple nozzles 46 are fixedly connected to the connecting frame 45, arranged along the length of the roller brush 427 and located on one side of the area brushed by the roller brush 427. After the water pump 43 is started, water flows through the water supply pipe 44 and is sprayed from the nozzles 46, providing high-pressure rinsing to the screening screen plate 34 after brushing by the roller brush 427, thoroughly washing away the detached impurities and preventing secondary adhesion. This cleaning method, combining brushing and rinsing, greatly improves the cleaning efficiency and thoroughness of the screening screen plate 34.

[0033] In a preferred embodiment, to achieve stable driving of the screening mechanism 3 and effective support for the screening screen plate 34, the screening mechanism 3 further includes a motor 31, a gear shaft 32, and a support plate 35. The motor 31 is fixedly mounted on the base frame 1, and its output shaft is connected to the gear shaft 32. When the motor 31 starts, it drives the gear shaft 32 to rotate. A chain 33 is wound around the gear shaft 32. The rotation of the gear shaft 32 drives the chain 33 to circulate, thereby driving the screening screen plate 34 connected to the chain 33 to move synchronously in a circulatory manner. The support plate 35 is fixedly mounted below the screening screen plate 34 and extends along the movement trajectory of the screening screen plate 34, providing stable support for the screening screen plate 34 during operation, preventing deformation or damage to the screening screen plate 34 when subjected to the pressure of sewage and impurities, and ensuring the smooth operation of the screening surface.

[0034] In another preferred embodiment, the top plate 41 of the cleaning mechanism 4 is located at the top of the cleaning mechanism 4 and serves as a sturdy mounting base for the cleaning assembly 42 and the flushing assembly. The top plate 41 is provided with corresponding mounting holes and fixing structures for precise installation of components such as the top frame 421, the water pump 43, and the connecting frame 45, ensuring the stability and collaborative performance of each component in the cleaning mechanism 4.

[0035] In another preferred embodiment, the transmission mechanism in the cleaning assembly 42 includes a top frame 421, a diagonal connecting rod 422, a fixed frame 423, a side-rotating frame 424, and a second motor 426. The top frame 421 is fixedly disposed below the top plate 41, and the two ends of the diagonal connecting rod 422 are respectively connected to the top frame 421 and the fixed frame 423 by a rotatable connection. The fixed frame 423 is slidably engaged with and driven by the piston rod of the cylinder 425 through the side-rotating frame 424, and the cylinder 425 is fixedly disposed on the support structure of the cleaning mechanism 4. The second motor 426 is fixedly disposed on the fixed frame 423, and its output shaft is drivenly connected to the roller brush 427, thereby driving the roller brush 427 to rotate. This transmission structure ensures that the extension and retraction of the cylinder 425 can be efficiently converted into the up and down sliding of the roller brush 427, and provides the necessary degrees of freedom at each connection point to adapt to the movement, while the second motor 426 can stably drive the roller brush 427 to perform brushing operations.

[0036] In another preferred embodiment, to ensure structural integrity and load-bearing capacity, the crushing mechanism 5 also includes side guard plates 51 and a crushing frame 522. The side guard plates 51 are fixedly connected to both sides of the base frame 1 and extend upwards, forming lateral support and protection for the crushing mechanism 5. The crushing frame 522 is fixedly disposed between the side guard plates 51, providing a robust mounting base for the crushing roller 523. The two ends of the crushing roller 523 are rotatably mounted on the crushing frame 522, ensuring that the crushing roller 523 can rotate stably and at high speed under the drive of the motor 521, completing the crushing operation of impurities. The side guard plates 51 also prevent impurities from splashing during the crushing process, improving the safety of equipment operation.

[0037] As a further preferred embodiment, to improve screening efficiency and impurity conveying capacity, the screening mesh plates 34 are arranged at an angle along the conveying direction of the chain 33, and together they form a continuous circulating stepped screening surface. This inclined stepped design not only utilizes gravity to assist wastewater in passing through the mesh plates, reducing screening resistance, but also facilitates the gradual upward conveying of impurities, avoiding impurity accumulation and ensuring the continuous and efficient operation of the screening mechanism 3.

[0038] As a further preferred embodiment, to maximize the drainage effect of crushed impurities and facilitate their discharge, the openings on the unloading rack 54 are of a grid structure, and the unloading rack 54 is inclined downwards. The grid-like openings provide a larger drainage area, allowing water in the crushed impurities to pass through quickly, reducing the moisture content of the impurities. At the same time, the inclined arrangement of the unloading rack 54 utilizes the principle of gravity, allowing the drained impurities to smoothly slide to the external collection device, preventing impurities from remaining or accumulating on the unloading rack 54, and ensuring the continuity of the output from the crushing mechanism 5.

[0039] As a further preferred embodiment, to enhance the crushing ability of large impurities, the crushing rollers 523 are preferably two rollers arranged in parallel, and the cutting heads 524 are preferably toothed blades arranged alternately on the rollers. Motor 521 drives these two rollers to rotate in opposite directions. When impurities enter, the alternately arranged toothed blades on the rollers, through shearing and tearing action, can more efficiently cut and crush large impurities into smaller particles, significantly improving crushing efficiency and adaptability to different types of impurities.

[0040] The working principle is as follows: After the device is started, wastewater flows in through the inlet and first contacts the screening mechanism 3. The motor 31 in the screening mechanism 3 drives the gear shaft 32 to rotate, which in turn drives the chain 33 in a cyclical motion. Multiple screening screens 34 connected to the chain 33 move upwards accordingly, forming a continuously circulating stepped screening surface. Solid impurities in the wastewater are effectively intercepted by the inclined screening screens 34 and conveyed upwards step by step, while clean water flows downstream through the screens. The support plate 35 provides support from below during the movement of the screening screens 34, ensuring stable operation.

[0041] When impurities accumulated on the screening screen 34 need cleaning, the cleaning mechanism 4 is activated. The cylinder 425 extends and retracts, driving the side rotating frame 424 to move along a preset track. The side rotating frame 424 drives the fixed frame 423 and the rotating brush 427 mounted on it to slide vertically, causing the brush surface of the brush 427 to contact the screening screen 34. Simultaneously, the motor 426 drives the brush 427 to rotate, using the bristles of the brush 427 to mechanically remove the impurities adhering to the screening screen 34. To ensure thorough cleaning, the water pump 43 is activated, supplying water to the nozzles 46 on the connecting frame 45 through the water pipe 44. The nozzles 46 spray water onto the screening screen 34 after the brush 427 has removed the impurities, rinsing it thoroughly. If the stains are stubborn, the cylinder 425 will extend further, increasing the downward contact force of the brush 427 for a more powerful cleaning. After a long period of cleaning, if the bristles of the roller brush 427 become shorter, the cylinder 425 can also flexibly adjust the height of the roller brush 427 to always ensure effective contact between the roller brush 427 and the screening screen plate 34, and ensure that the cleaning effect remains unchanged.

[0042] After the cleaning mechanism 4 sweeps the impurities from the screening screen 34, the impurities enter the crushing mechanism 5 through the shrink hopper 53. The motor 521 in the crushing mechanism 5 drives the crushing roller 523 to rotate. Multiple cutting heads 524 on the outer periphery of the crushing roller 523 cut and crush the incoming impurities, reducing the volume of large pieces. The crushed impurities fall onto the unloading rack 54, which is inclined downwards and has multiple mesh-like openings. This allows the impurities to slide down under gravity while the moisture is drained through the openings, reducing the moisture content of the impurities and facilitating subsequent transportation and processing. Through the synergistic effect of the adjustable cleaning function of the cleaning mechanism 4 and the volume reduction and dehydration function of the crushing mechanism 5, this invention effectively solves the problems of incomplete screen cleaning, insufficient ability to treat stubborn stains, and failure to effectively reduce the volume and dehydrate the swept-down waste, leading to difficulties in subsequent transportation and processing. This significantly improves the efficiency and automation level of wastewater pretreatment.

Claims

1. A multi-stage bar screen for wastewater pretreatment, comprising: The base frame (1) has side plates (2) fixedly connected to its opposite sides. The base frame (1) and the side plates (2) together constitute the main support structure of the device. Screening mechanism (3) is disposed in the internal space formed between the base frame (1) and the side plate (2). The screening mechanism (3) includes a chain (33) and a plurality of screening screen plates (34) that are cyclically connected at intervals along the length direction of the chain (33). The screening screen plates (34) together constitute a screening surface for intercepting sewage impurities. Its features are, The device also includes a cleaning mechanism (4) and a crushing mechanism (5); The cleaning mechanism (4) is located above the screening mechanism (3) and includes a cleaning component (42) and a rinsing component. The cleaning component (42) includes a roller brush (427), which is height-adjustable and rotates through a transmission mechanism driven by a cylinder (425) to brush the screening screen (34). The cylinder (425) adjusts the contact force and height between the roller brush (427) and the screening screen (34) by extension and retraction. The rinsing component includes a water pump (43) and a nozzle (46). The water pump (43) supplies water to the nozzle (46) located on one side of the area brushed by the roller brush (427) through a water pipe (44) to rinse the screening screen (34). The crushing mechanism (5) is located below the impurity discharge end of the cleaning mechanism (4), and includes a shrink bucket (53), a crushing component (52), and a discharge rack (54). The shrink bucket (53) is located above the crushing component (52) and is used to collect and guide impurities. The crushing component (52) includes a motor (521) and a crushing roller (523) driven by the motor (521). The outer periphery of the crushing roller (523) is provided with a cutting head (524), which cuts and crushes the impurities. The discharge rack (54) is located below the crushing component (52) and is used to receive the crushed impurities. The discharge rack (54) is provided with multiple openings for draining the impurities.

2. The multi-stage bar screen for wastewater pretreatment according to claim 1, characterized in that, The screening mechanism (3) also includes a motor (31), a gear shaft (32) and a support plate (35). The motor (31) is connected to the gear shaft (32) for transmission. The gear shaft (32) drives the chain (33) to rotate. The support plate (35) is fixedly set below the screening screen plate (34) to support the screening screen plate (34).

3. The multi-stage bar screen for wastewater pretreatment according to claim 1, characterized in that, The cleaning mechanism (4) also includes a top plate (41) located on top of the cleaning mechanism (4) and used to install the cleaning assembly (42) and the rinsing assembly.

4. The multi-stage bar screen for wastewater pretreatment according to claim 1, characterized in that, The transmission mechanism in the cleaning assembly (42) includes a top frame (421), a diagonal connecting rod (422), a fixed frame (423), a side rotating frame (424), and a second motor (426). The top frame (421) is connected to the fixed frame (423) through the diagonal connecting rod (422). The fixed frame (423) is connected to the cylinder (425) through the side rotating frame (424). The second motor (426) is fixedly mounted on the fixed frame (423) and drives the roller brush (427) to rotate.

5. The multi-stage bar screen for wastewater pretreatment according to claim 1, characterized in that, The crushing mechanism (5) also includes a side guard plate (51) and a crushing frame (522). The side guard plate (51) is fixedly connected to both sides of the base frame (1). The crushing frame (522) is fixedly arranged between the side guard plates (51). The crushing roller (523) is rotatably arranged on the crushing frame (522).

6. The multi-stage bar screen for wastewater pretreatment according to claim 1, characterized in that, The screening mesh plates (34) are arranged at an incline along the conveying direction of the chain (33) and together form a continuous, cyclical stepped screening surface.

7. The multi-stage bar screen for wastewater pretreatment according to claim 1, characterized in that, The openings on the unloading rack (54) are in a grid structure to maximize the drainage effect, and the unloading rack (54) is inclined downward to facilitate the sliding of impurities.

8. The multi-stage bar screen for wastewater pretreatment according to claim 1, characterized in that, The crushing roller (523) consists of two rollers arranged in parallel to each other, and the cutting head (524) consists of toothed blades arranged alternately on the rollers. The two rollers rotate in opposite directions to tear and crush impurities.

Images