Environment-friendly mixing plant

Abstract

The utility model relates to the technical field of concrete mixing plants, in particular to an environment-friendly mixing plant which comprises an aggregate feeding device, the aggregate feeding device comprises a storage bin and a feeding device, the feeding device comprises a conveying channel and a conveying mechanism, the conveying mechanism is arranged in the conveying channel, and the conveying channel is communicated with the storage bin. A discharging hopper is arranged on the material conveying channel and used for being communicated with the outside, the discharging hopper is in lap joint with one end of the conveying mechanism, and the other end of the conveying mechanism is in lap joint with a feeding port of the material storage bin. The feeding device is small in occupied area, high in feeding efficiency, beneficial to achieving automatic aggregate production, capable of effectively reducing dust and noise pollution in a mixing plant factory area in the concrete production process, environmentally friendly and economical.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete mixing stations, in particular to an environmentally friendly mixing station. Background Art

[0002] A concrete mixing station is a combined device used to mix concrete in a centralized manner, also known as a concrete prefabrication plant. It is often used in large-scale water conservancy projects, bridges, and other projects with large concrete projects, long construction periods, and concentrated construction sites. Its production process mainly involves batching, weighing, mixing, and finally discharging aggregates, powders, and water-external additives according to the pre-set blending ratio of the system. Sand and gravel aggregates are the main raw materials for concrete. Traditional concrete production companies generally build large steel structure material sheds near the project. After the external sand and gravel aggregates are brought in, they are piled up in the material shed with loaders. During the concrete production process, loaders are also required to transport sand and gravel aggregates between the material shed and the batching system of the mixing station. Sand and gravel aggregates are stored in traditional ground yards, which occupy a large area and have low space utilization in the plant area. In addition, a lot of dust is easily generated during the transportation of sand and gravel, which has poor safety and environmental protection, is not conducive to the health of workers, and is not convenient for concrete production and processing. Utility Model Content

[0003] The utility model aims to provide an environmentally friendly mixing station in view of the problems of low plant space utilization and poor safety and environmental protection in the prior art which adopts the material loading form of a loader.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] An environmentally friendly mixing station includes an aggregate feeding device, the aggregate feeding device includes a storage bin and a feeding device, the feeding device includes a feed channel and a conveying mechanism, the conveying mechanism is arranged inside the feed channel, a discharge funnel is provided on the feed channel for communicating with the outside, the discharge funnel is overlapped with one end of the conveying mechanism, and the other end of the conveying mechanism is overlapped with the feed port of the storage bin.

[0006] The above-mentioned environment-friendly mixing station loads aggregates through a discharging funnel, stores aggregates in a storage bin, and integrates the storage bin with a feeding channel and a conveying mechanism. The feeding mechanism is overlapped with the feeding port of the storage bin to convey aggregates, and can realize large-scale storage of sand and gravel aggregates in a limited space, with a small footprint and high loading efficiency. The feeding channel is used to close the conveying mechanism to prevent the conveying mechanism from conveying aggregates in the open air, thereby blocking the influence of wind and suppressing the generation of dust by the conveying mechanism during transportation. Conversely, the dust raised by the aggregates when entering the storage bin through the feeding port can also be prevented from being dispersed through the feeding channel. On the other hand, the setting of the feeding channel can also reduce the production noise of the conveying mechanism.

[0007] As a preferred embodiment of the present utility model, the storage bin is provided with a plurality of silos, the feed channel comprises a first inclined channel and a second straight channel, the conveying mechanism comprises a flat belt conveyor and an inclined belt conveyor, the second straight channel connects two adjacent silos, the flat belt conveyor is arranged in the second straight channel, the two ends of the flat belt conveyor overlap with the feed ports of the two adjacent silos, a loading funnel is provided in the middle of the second straight channel, the inclined belt conveyor is arranged in the first inclined channel, and the higher end of the inclined belt conveyor overlaps with the loading funnel.

[0008] In this solution, it is preferred that every two silos share a feeding line, and the aggregate is transferred to a high-position flat belt conveyor by an inclined belt conveyor, and the distribution of the aggregate between the two silos is achieved by controlling the forward and reverse rotation of the flat belt conveyor.

[0009] Alternatively, as another possible implementation scheme, the feeding hopper can be arranged at the end of the second straight channel, and the feeding hopper adopts a double-mouthed hopper, and a flip door is arranged in the double-mouthed hopper. By controlling the flip door, the feeding hopper is connected to the feeding port of one of the silos to realize direct unloading of aggregates, or the feeding hopper is connected to a flat belt conveyor, and the flat belt conveyor transports the aggregates to another silo, thereby realizing the distribution of aggregates between the two silos, which is not limited to the above examples.

[0010] As a preferred solution of the utility model, the storage bins are arranged in two rows, and unloading platforms are respectively provided on both sides of the two rows of storage bins, and the loading device is arranged between the unloading platform and the storage bins on the corresponding side. The storage bins are arranged in two rows, and the loading devices are arranged on both sides of the two rows of storage bins for separate transportation, which makes loading more convenient and helps to improve loading efficiency.

[0011] As a preferred solution of the utility model, a conveying gallery is provided at the bottom of the storage bin, and the conveying gallery is a reinforced concrete structure, and the conveying gallery is located below the ground. The discharge port of the storage bin extends into the conveying gallery, and a first discharge device corresponding to the position of the discharge port is provided in the conveying gallery. By setting a reinforced concrete structure conveying gallery below the ground to support the storage bin, on the one hand, the structural strength is high, which can meet the requirements of the storage bin for large-volume storage and small floor space, and on the other hand, the dust generated during the aggregate unloading process can be concentrated in the conveying gallery, which has little air pollution, low unloading noise, and is green and environmentally friendly.

[0012] As a preferred solution of the utility model, the first discharging device adopts a belt conveyor, which is convenient for transportation and short-segment assembly.

[0013] As a preferred solution of the utility model, a foundation pit is provided at the end of the conveying gallery, and a second discharge device is installed in an inclined manner in the foundation pit, and the second discharge device is connected to the first discharge device. By excavating a foundation pit at the end of the conveying gallery and installing the second discharge device, it is convenient to transfer the aggregate on the first discharge device to the next production process; placing the conveying gallery below the ground and receiving it in the foundation pit of the conveying gallery is conducive to effectively suppressing the dust and noise generated by the aggregate during the unloading process, and solving the bearing strength and environmental protection problems.

[0014] As a preferred embodiment of the present invention, the environmentally friendly mixing station in the present invention further includes an aggregate precooling treatment device, which is connected to the second discharging device. The aggregate precooling treatment device is used to precool the aggregate so that the aggregate used for mixing meets the temperature requirements of precooled concrete; the present embodiment transports the discharged aggregate to the aggregate precooling treatment device through the second discharging device for separate precooling treatment, and during the aggregate precooling process, aggregate preparation can be performed at the storage bin at the same time, which is suitable for realizing the production of precooled concrete and has high production efficiency.

[0015] As a preferred embodiment of the present invention, the environmentally friendly mixing station in the present invention also includes a powder storage bin and a mixing station. The powder storage bin is connected to the mixing station via a screw conveyor. Both the powder storage bin and the screw conveyor are closed. A pulse dust collector is provided on the top of the powder storage bin. The pulse dust collector is connected to the powder storage bin. This solution closes the powder storage bin for storing powder and sets a pulse dust collector on the top. The pulse dust collector filters dust and discharges internal air. The powder in the powder storage bin is airtightly transported to the mixing station via a screw conveyor to ensure that there is no leakage when the powder enters the site.

[0016] As a preferred embodiment of the utility model, the environmentally friendly mixing station in the utility model also includes a sewage treatment system, which includes a sand and gravel separator, a mixing tank, a sedimentation tank, a filter press and a clear water tank. The drain outlet of the sand and gravel separator is connected to the mixing tank through a pipeline. The mixing tank is provided with a stirrer, a water level detector and a sewage pump. The sewage pump is connected to the filter press through a pipeline. The filter press is connected to the clear water tank. The sedimentation tank is provided with a water replenishment pump, which is connected to the mixing tank. The sewage is purified by the sewage treatment system to achieve the reuse of available resources. In this scheme, the sand and gravel separator is used to separate the remaining concrete in the mixing tank truck or the stones and sand in the cleaning sewage, and the sewage is directly discharged into the mixing tank; the stirrer in the mixing tank is used to fully stir to prevent the slurry from settling and stratifying; the sedimentation tank is used to collect the sewage generated during the mixing production process; the filter press is used to produce filter cakes and filtrate; the clear water tank is used to collect the clear water separated by the filter press. During the sewage treatment process, the sewage pump or water replenishment pump can be automatically started according to the water level detection in the mixing tank to realize automatic sewage circulation treatment.

[0017] As a preferred solution of the utility model, the sewage treatment system further includes a washing table, which is connected to the sand and gravel separator; the washing table is provided with a flow channel, which is arranged at an angle, and an outlet is arranged at the lower end of the flow channel, and the outlet is connected to the water inlet of the sand and gravel separator through an inclined pipe, and the pipe is arranged from high to low from the outlet to the sand and gravel separator. This solution connects the washing table with the sand and gravel separator to realize the recycling of water resources and is also convenient for staff to clean.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] 1. The environmentally friendly mixing station provided by the utility model has a small footprint and high feeding efficiency, which is conducive to the realization of automated production of aggregates. It can also effectively reduce dust and noise pollution in the mixing station plant during concrete production, which is environmentally friendly and economical.

[0020] 2. The environmentally friendly mixing station provided by the utility model can realize efficient and automatic treatment of sewage, realize the reuse of available resources, and be green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a plan layout diagram of an environmentally friendly mixing station in Example 1;

[0022] Figure 2 yes Figure 1 Elevation drawing of

[0023] Figure 3 is a plan view of the aggregate feeding device in Example 1;

[0024] Figure 4 This is an elevation view of the case where a material conveying gallery is provided at the bottom of the silo in Example 1;

[0025] Figure 5 It is a schematic diagram of the structural composition of the sewage treatment system.

[0026] Icons: 1-storage silo; 2-feeding device; 21-discharging funnel; 22-feeding funnel; 23-first inclined channel; 24-second straight channel; 3-discharging platform; 4-conveying gallery; 5-first discharging device; 6-aggregate pre-cooling treatment device; 7-mixing station; 8-powder storage silo; 9-wastewater treatment system; 91-sand and gravel separator; 92-mixing tank; 93-sedimentation tank; 94-filter press; 95-clear water tank; 96-cleaning table; 10-second discharging device. DETAILED DESCRIPTION

[0027] The utility model is described in detail below in conjunction with the accompanying drawings.

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] Example 1

[0030] An environmentally friendly mixing station, such as Figure 1-Figure 5 As shown, it includes an aggregate feeding device 2, which includes a storage bin 1 and a feeding device 2, and the feeding device 2 includes a feeding channel and a conveying mechanism. The conveying mechanism is arranged inside the feeding channel, and a discharge funnel 21 is provided on the feeding channel for communicating with the outside. The discharge funnel 21 is overlapped with one end of the conveying mechanism, and the other end of the conveying mechanism is overlapped with the feed port of the storage bin 1.

[0031] When loading aggregates, the materials are loaded through the unloading funnel 21, and the aggregates are centrally stored in the storage bin 1. The feeding channel and the conveying mechanism are integrated with the storage bin 1, and the feeding mechanism is overlapped with the feeding port of the storage bin 1 to convey the aggregates. Large-scale storage of sand and gravel aggregates can be achieved in a limited space, with a small footprint and high loading efficiency. Among them, the setting of the feeding channel is used to close the conveying mechanism to prevent the conveying mechanism from conveying aggregates in the open air, blocking the influence of wind, thereby suppressing the conveying mechanism from generating dust during transportation. Conversely, the dust raised by the aggregate when entering the storage bin 1 through the feeding port can also be suppressed from escaping through the feeding channel. On the other hand, the setting of the feeding channel can also reduce the production noise of the conveying mechanism.

[0032] Specifically, Figure 1 , Figure 2 As shown, the storage bin 1 in this embodiment is provided with a plurality of silos, each of which is independently arranged, a feed port is arranged at the top of the silo, and a discharge port is arranged at the bottom of the silo; the storage bins 1 are arranged in two rows, and unloading platforms 3 are respectively provided on both sides of the two rows of storage bins 1, and the loading device 2 is arranged between the unloading platform 3 and the corresponding side storage bins 1, and the silos on the opposite sides are loaded from the unloading platforms 3 on both sides, which makes loading more convenient and also facilitates the entry and exit of vehicles. Furthermore, in each row of storage silos 1, every two silos share a feeding line, and the feeding channel of each feeding line includes a first inclined channel 23 and a second straight channel 24. The conveying mechanism includes a flat belt conveyor and an inclined belt conveyor. The second straight channel 24 is fixedly arranged on the top of two adjacent silos, and the flat belt conveyor is arranged in the second straight channel 24. The two ends of the flat belt conveyor overlap with the feed ports of the two adjacent silos. A feeding funnel 22 is arranged in the middle of the second straight channel 24, and the inclined belt conveyor is arranged in the first inclined channel 23. The higher end of the inclined belt conveyor overlaps with the feeding funnel 22. The unloading funnel 21 is arranged at the lower end of the first inclined channel 23, and the feeding line is T-shaped as a whole. When in use, the aggregate transport vehicle unloads the aggregate at the unloading funnel 21, and the aggregate falls onto the inclined belt conveyor inside the first inclined channel 23 through the unloading funnel 21. The inclined belt conveyor transports the aggregate to a high position in a closed manner, and guides the aggregate through the loading funnel 22 to fall onto the flat belt conveyor in the second straight channel 24. The aggregate is distributed to the storage bin 1 at either end by controlling the forward and reverse rotation of the flat belt conveyor, so as to be used for the aggregate supply of the next production link.

[0033] Furthermore, if Figure 2 , Figure 4 As shown, a conveying gallery 4 is provided at the bottom of the storage bin 1. The conveying gallery 4 is a reinforced concrete structure. The conveying gallery 4 is located below the ground. The discharge port of the storage bin 1 extends into the conveying gallery 4. A first discharge device 5 corresponding to the discharge port is provided in the conveying gallery 4. The first discharge device 5 adopts a belt conveyor, which is convenient for short-segment transportation and assembly. A foundation pit is provided at the end of the conveying gallery 4. A second discharge device 10 is set up in the foundation pit. The second discharge device 10 is connected to the first discharge device 5. By setting a reinforced concrete structure conveying gallery 4 below the ground to support the storage bin 1, on the one hand, the structural strength is high, which can meet the requirements of the storage bin 1 for large-volume storage and small floor space. On the other hand, the dust generated during the aggregate unloading process can be concentrated in the conveying gallery 4, which has little air pollution, and the unloading noise is small, which is green and environmentally friendly. Even if the dust generated by aggregate feeding spreads through both ends of the conveying gallery 4 along the length direction, the side walls of the foundation pit can further prevent the dust from spreading, so that the dust and noise are concentrated and controlled below the ground, and are less affected by wind.

[0034] Furthermore, if Figure 1 , Figure 2As shown, the environmentally friendly mixing station in this embodiment also includes an aggregate precooling treatment device 6, which is connected to the second discharging device 10. The aggregate precooling treatment device 6 is used to precool the aggregate so that the aggregate used for mixing meets the temperature requirements of precooled concrete; this solution transports the discharged aggregate to the aggregate precooling treatment device 6 through the second discharging device 10 for separate precooling treatment. During the aggregate precooling process, aggregate preparation can be carried out at the storage bin 1 at the same time, which is suitable for realizing the production of precooled concrete with high production efficiency.

[0035] Furthermore, if Figure 1 , Figure 2 As shown, the environmentally friendly mixing station in this embodiment also includes a powder storage bin 8 and a mixing station 7. The powder storage bin 8 is connected to the mixing station 7 through a screw conveyor, and the aggregate precooling treatment device 6 is connected to the mixing station 7 through a third discharging device. During production, the powder storage bin 8 and the aggregate precooling treatment device 6 are directly used to provide the mixing station 7 with powder and aggregate that meet the requirements, so that the sand and gravel aggregates can be directly involved in concrete production without secondary transfer, thereby eliminating the need for a loader to transport aggregates, reducing labor costs, and having a high degree of automation and simple operation. In this embodiment, the powder storage bin 8 and the screw conveyor are both closed, and a pulse dust collector is provided on the top of the powder storage bin 8, which is connected to the powder storage bin 8. In this solution, the powder storage bin 8 for storing powder is closed and a pulse dust collector is provided on its top. The pulse dust collector filters dust and discharges internal air, and the powder in the powder storage bin 8 is sealed and transported to the mixing station 7 through the screw conveyor to ensure that there is no leakage of powder entering the site.

[0036] Furthermore, if Figure 1 , Figure 5As shown, the environmentally friendly mixing station in this embodiment also includes a sewage treatment system 9, which includes a sand and gravel separator 91, a mixing tank 92, a sedimentation tank 93, a filter press 94 and a clear water tank 95. The drain outlet of the sand and gravel separator 91 is connected to the mixing tank 92 through a pipeline. The mixing tank 92 is provided with a stirrer, a water level detector and a sewage pump. The sewage pump is connected to the filter press 94 through a pipeline. The filter press 94 is connected to the clear water tank 95. The sedimentation tank 93 is provided with a water replenishment pump, which is connected to the mixing tank 92. Among them, the stirrer, the water level detector, the sewage pump and the water replenishment pump are all connected to the main control system. The sand and gravel separator 91 is used to separate the stones and sand in the sewage and discharge the sewage directly into the mixing tank 92; the stirrer in the mixing tank 92 is used to fully stir to prevent the slurry from settling and stratifying; the sedimentation tank 93 is used to collect the sewage generated during the mixing production process; the filter press 94 is used to produce filter cakes and filtrate; the clear water tank 95 is used to collect the clear water separated by the filter press 94. The agitator, gravel separator 91 and filter press 94 are all equipped with automatic control systems. The gravel separator 91 starts automatically when it senses waste discharge, and the agitator automatically starts stirring when it senses solution entering. Similarly, the filter press 94 can also automatically press the slurry when it senses sewage entering.

[0037] During production, when the mixer truck is finished or needs to be cleaned in the middle of the production, the truck drives to the gravel separator 91, and the remaining concrete in the mixing tank is discharged to the gravel separator 91. The gravel separator 91 will separate the stones and sand, and discharge the sand and stones into the collection pools on both sides, and discharge the sewage directly into the mixing tank 92; when the water level detector in the mixing tank 92 detects that the sewage in the mixing tank 92 reaches the preset high water level, the water in the mixing tank 92 is pumped to the filter press 94 for filtration through the sewage pump, and the mud in the sewage is pressed into a mud cake for road filling and other aspects. The clean water filtered out is discharged to the clean water tank 95. After the water quality test determines that it is "harmless", it is used for watering and dust reduction and greening at the construction site, and the waste water and waste residue are "eaten up" through recycling; when there is no more sewage discharged into the mixing tank 92 and the current water level is low, the water replenishment pump is automatically started to send the sewage collected in the sedimentation tank 93 to the mixing tank 92. A water level detector is also provided in the sedimentation tank 93 and is also connected to the main control system for communication to prevent the water supply pump from being emptied.

[0038] Furthermore, the sewage treatment system 9 further includes a cleaning table 96, which is connected to the sand and gravel separator 91; the cleaning table 96 is provided with a flow channel, which is arranged in an inclined manner, and an outlet is arranged at the lower end of the flow channel, and the outlet is connected to the water inlet of the sand and gravel separator 91 through an inclined pipe, and the pipe is arranged from high to low from the outlet to the sand and gravel separator 91. Connecting the cleaning table 96 with the sand and gravel separator 91 is conducive to the recycling of water resources and is also convenient for staff to clean.

[0039] Example 2

[0040] Compared with Example 1, the difference of the environmentally friendly mixing station in this embodiment is mainly that the overall feeding channel is in an inverted L shape. Specifically, the feeding hopper 22 in this embodiment is arranged at either end of the second straight channel 24, and the feeding hopper 22 adopts a double-mouthed hopper, and a flip door is arranged in the double-mouthed hopper. By controlling the flip door, the feeding hopper 22 is connected to the feeding port of one of the silos to realize direct unloading of aggregates, or the feeding hopper 22 is connected to a flat belt conveyor, and the flat belt conveyor transports the aggregates to another silo, thereby realizing the distribution of aggregates between the two silos.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly mixing station, comprising an aggregate feeding device (2), characterized in that: The aggregate feeding device (2) comprises a storage bin (1) and a feeding device (2), wherein the feeding device (2) comprises a feeding channel and a conveying mechanism, wherein the conveying mechanism is arranged inside the feeding channel, and a discharge funnel (21) is arranged on the feeding channel for communicating with the outside, wherein the discharge funnel (21) is overlapped with one end of the conveying mechanism, and the other end of the conveying mechanism is overlapped with a feeding port of the storage bin (1).

2. An environmentally friendly mixing station according to claim 1, characterized in that: The storage bin (1) is provided with a plurality of silos, the feeding channel comprises a first inclined channel (23) and a second straight channel (24), the conveying mechanism comprises a flat belt conveyor and an inclined belt conveyor, the second straight channel (24) connects two adjacent silos, the flat belt conveyor is arranged in the second straight channel (24), the two ends of the flat belt conveyor overlap with the feed ports of the two adjacent silos, a feeding hopper (22) is provided in the middle of the second straight channel (24), the inclined belt conveyor is arranged in the first inclined channel (23), and the higher end of the inclined belt conveyor overlaps with the feeding hopper (22); Alternatively, the loading funnel (22) is arranged at the end of the second straight channel (24), and the loading funnel (22) is a double-mouthed material dividing hopper, and a flip door is arranged inside the double-mouthed material dividing hopper.

3. The environmentally friendly mixing station according to claim 1, characterized in that: The storage bins (1) are arranged in two rows, and unloading platforms (3) are respectively provided on both sides of the two rows of storage bins (1), and the loading device (2) is arranged between the unloading platform (3) and the storage bin (1) on the corresponding side.

4. The environmentally friendly mixing station according to claim 1, characterized in that: A material conveying gallery (4) is provided at the bottom of the storage bin (1), the material conveying gallery (4) is a reinforced concrete structure, the material conveying gallery (4) is located below the ground, the material discharge port of the storage bin (1) extends into the material conveying gallery (4), and a first material discharge device (5) corresponding to the position of the material discharge port is provided in the material conveying gallery (4).

5. The environmentally friendly mixing station according to claim 4, characterized in that: The first discharging device (5) is a belt conveyor.

6. The environmentally friendly mixing station according to claim 4, characterized in that: A foundation pit is provided at the end of the conveying gallery (4), and a second discharge device (10) is arranged in an inclined manner in the foundation pit, and the lower end of the second discharge device (10) is connected to the first discharge device (5).

7. The environmentally friendly mixing station according to claim 6, characterized in that: It also comprises an aggregate pre-cooling treatment device (6), wherein the aggregate pre-cooling treatment device (6) is connected to the second discharging device (10).

8. An environmentally friendly mixing station according to any one of claims 1 to 7, characterized in that: It also comprises a powder storage bin (8) and a mixing station (7), wherein the powder storage bin (8) is connected to the mixing station (7) via a screw conveyor, the powder storage bin (8) and the screw conveyor are both closed, and a pulse dust collector is provided on the top of the powder storage bin (8), and the pulse dust collector is connected to the powder storage bin (8).

9. An environmentally friendly mixing station according to any one of claims 1 to 7, characterized in that: The invention also comprises a sewage treatment system (9), wherein the sewage treatment system (9) comprises a sand and gravel separator (91), a stirring tank (92), a sedimentation tank (93), a filter press (94) and a clear water tank (95), wherein a drain outlet of the sand and gravel separator (91) is connected to the stirring tank (92) via a pipeline, a stirrer, a water level detector and a sewage pump are provided in the stirring tank (92), the sewage pump is connected to the filter press (94) via a pipeline, the filter press (94) is connected to the clear water tank (95), and a water replenishment pump is provided in the sedimentation tank (93), and the water replenishment pump is connected to the stirring tank (92).

10. The environmentally friendly mixing station according to claim 9, characterized in that: The sewage treatment system (9) further comprises a cleaning table (96), wherein the cleaning table (96) is connected to the sand and gravel separator (91); the cleaning table (96) is provided with a flow channel, wherein the flow channel is arranged in an inclined manner, an outlet is arranged at the lower end of the flow channel, and the outlet is connected to the water inlet of the sand and gravel separator (91) via an inclined pipe, wherein the pipe is arranged from high to low from the outlet to the sand and gravel separator (91).

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