Concrete mixing station waste recycling system and operation method

Abstract

The invention relates to a concrete mixing station waste recycling system and an operation method, a concrete conveying tank car is cleaned to obtain concrete waste, stones and slurry water are separated out through a sand-stone separator, and the slurry water enters a rotational flow settling tank; slurry is layered in the rotational flow sedimentation tank through rotational flow, coarse sand with large particles sinks to the rotational flow separation pump and is further separated into coarse sand and mortar, and the mortar enters the sewage stirring system from the rotational flow sedimentation tank. The concrete mixing station waste recycling system has the beneficial effects that through the concrete mixing station waste recycling system and the open type structural design, maintenance and use of a mixing station are facilitated, the pollution problem of a construction site is solved, the construction technology is simplified, the construction efficiency is improved, and the construction cost is reduced; the stirring rod is additionally arranged at the bottom of the rotational flow settling tank, settled silt is stirred and crushed again, fine sand in the silt enters the rotational flow area again to be subjected to rotational flow separation, the fine sand recycling amount is increased, and resource waste is reduced.

Description

Technical Field

[0001] The invention belongs to the field of sewage treatment construction, and in particular relates to a concrete mixing station waste material recycling system and an operation method. Background Art

[0002] With the continuous deepening and development of infrastructure and urbanization construction, as well as the promotion of ready-mixed concrete and mandatory use requirements, the demand for ready-mixed concrete will further increase in the future, and the demand for concrete mixing stations will also increase. At present, the design and construction of traditional concrete mixing stations are more concerned with whether they can meet basic use needs. They lack necessary considerations for energy saving and emission reduction, and cannot respond to the current policy of energy conservation and emission reduction, increasing economic benefits and improving quality. Therefore, how to build a green and environmentally friendly mixing station, save energy and reduce emissions while meeting basic use needs, and bear the social responsibility of enterprises while saving costs and improving benefits for enterprises will be the foothold and core starting point for the development of modern new mixing stations. With the production of concrete, a large amount of waste concrete and sewage will be generated. If not handled in time, it will cause serious pollution to the atmosphere and soil. The traditional treatment method is sand and gravel separator + sewage three-stage sedimentation tank. The sand and gravel separator realizes the separation of sand and gravel in concrete, and the sewage three-stage sedimentation tank realizes solid-liquid separation. Clean water is reused and sediment is cleaned. The disadvantage of this treatment process is that the solid-liquid separation is not thorough, and there is serious secondary pollution during the treatment process.

[0003] In view of this, in view of the problems existing in the sewage treatment construction of concrete mixing plants, a concrete mixing plant waste recycling system and operation method are urgently needed to improve the sewage treatment construction efficiency, improve the construction quality, and ensure the safety and reliability of the construction quality. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a concrete mixing plant waste recycling system and an operating method.

[0005] The operation method of the waste recycling system of the concrete mixing plant includes the following specific steps:

[0006] Step 1: Clean the concrete transport tank truck to obtain concrete waste, separate the stones and slurry water through a sand and gravel separator, and the slurry water enters a cyclone sedimentation tank;

[0007] Step 2: The slurry is layered by cyclone in the cyclone settling tank. Fine sand with smaller particles enters the top overflow area, and coarse sand with larger particles sinks to the cyclone separation pump and is further separated into coarse sand and slurry. The slurry enters the sewage mixing system from the cyclone settling tank.

[0008] Step 3: The sewage mixing system is installed in the mixing tank, and the slurry water is injected into the sewage concentration adjustment system;

[0009] Step 4: The sewage concentration regulating system adjusts the sewage concentration and recycles it.

[0010] Preferably, in step 2, fine sand with smaller particles enters the top overflow zone through the cyclone in the cyclone zone, and is discharged from the fine sand discharge port at the top of the cyclone sedimentation tank for decomposition and recovery; coarse sand with larger particles in the cyclone sedimentation tank will sink to the bottom due to gravity, and a cyclone separation pump is arranged at the bottom of the cyclone sedimentation tank, and the cyclone separation pump is connected to the agitator, and a wear-resistant stirring impeller is arranged on the agitator to beat the precipitated silt into turbulence for re-separation, and the coarse sand with the largest particles is discharged from the slag discharge port at the bottom of the cyclone sedimentation tank for separation, and the other end of the bottom of the cyclone sedimentation tank is a mud discharge port, and the mud enters the sewage mixing system from the cyclone sedimentation tank; a screen is arranged in front of the discharge port pipe to improve the recovery rate of coarse sand.

[0011] Preferably, in step three, a sewage treatment agent tank is arranged outside the sewage mixing system, and the sewage treatment agent enters the sewage mixing tank in a quantitative manner through a lower control valve.

[0012] Preferably, in step three, a drill rod is provided in the sewage stirring system, and oblique stirring blades are arranged on the drill rod, including a first stirring blade and a second stirring blade. The first stirring blade and the second stirring blade are arranged crosswise and have different lengths. A guide member is also arranged near the stirring blade.

[0013] Preferably, in step four, the sewage concentration regulating system is installed in the ground mixing tank and connected to the sewage mixing system. The sewage pump of the sewage mixing system injects slurry water into the sewage concentration regulating system. A concentration tester and a liquid level meter are installed at the bottom of the sewage concentration regulating system. The concentration tester measures the sewage concentration in the mixing tank. The sewage enters the mixing tank from the clean water filling port according to the sewage concentration setting value to adjust the sewage concentration. After reaching the required setting value, the sewage is recycled; the sewage concentration tester in the mixing tank is fixed to the left side of the mixing tank, and the liquid level meter is fixed to the right inner wall of the mixing tank by bolts to better measure the sewage concentration and liquid level; the sewage after concentration adjustment is filtered by the sewage pump and the metering system, and the recycled water after filtration is utilized.

[0014] Preferably, an intelligent electronic control system for the mixing station is provided, which is used to start or stop the whole system or a part of the system according to the actual working conditions to cooperate with the work; the intelligent electronic control system of the mixing station includes a vehicle scale limit, a laser radar, an intelligent camera, a water supply control system, a crawler transmission system, a sewage mixing system and a sewage concentration adjustment system, which are operated and controlled by a PLC intelligent electronic control console; in step six, the vehicle scale limit is arranged on the parking space for the tank truck, and intelligent cameras are arranged around it. The laser radar is arranged in the stone storage area. When the stone and sand storage area is insufficient, an automatic warning is issued to remind the staff to clean up.

[0015] Preferably, in step one, a tank truck cleaning area and a car washing trough are further provided at the front end of the sand and gravel separator; a tank truck parking space is provided in the tank truck cleaning area, and a water pipe is provided on the upper part of the tank truck parking space for washing the tank truck. The concrete delivery tank truck enters the tank truck cleaning area and is parked on the tank truck parking space; the upper water pipe is used to wash the tank truck, and the tank truck concrete waste enters the car washing trough after washing; the car washing trough is connected to the sand and gravel separator, and the concrete waste flows to the sand and gravel separator through the pipe for preliminary separation. After the waste is screened in the sand and gravel separator, the stone is transported to the stone storage area by a crawler conveyor, and the slurry water enters the cyclone sedimentation tank for further separation.

[0016] A concrete mixing station waste material recycling system and an operation method thereof are obtained by constructing the concrete mixing station waste material recycling system according to any one of the above-mentioned construction methods.

[0017] The beneficial effects of the present invention are:

[0018] 1) The present invention adopts a waste recycling system of a concrete mixing station, and the open structure design is conducive to the maintenance and use of the mixing station, solves the pollution problem of the construction site, simplifies the construction process, improves the construction efficiency, and reduces the construction cost.

[0019] 2) The present invention adds a stirring rod at the bottom of the cyclone sedimentation tank to re-stir and crush the precipitated silt, allowing the fine sand in the silt to re-enter the cyclone area for cyclone separation, thereby increasing the amount of fine sand recovered and reducing resource waste.

[0020] 3) The present invention uses a sewage stirring system and a sewage concentration regulating system to regularly stir sewage, intelligently regulate sewage concentration, purify sewage and recycle it, thereby improving sewage utilization and saving costs.

[0021] 4) The present invention adopts an intelligent electric control system and PLC full-automatic control. The reuse rate of sand, stone and water in the mixing station is high, and sewage is discharged zero, which effectively solves the problem of environmental pollution caused by sewage discharge and improves resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the overall structural layout diagram of the waste recycling and reuse system of the mixing station.

[0023] Figure 2 Schematic diagram of the cyclone settling tank structure.

[0024] Figure 3 It is a schematic diagram of the sewage mixing system structure.

[0025] Figure 4 It is a structural diagram of the sewage concentration regulation system.

[0026] Figure 5 It is the layout diagram of the intelligent electronic control system of the mixing station.

[0027] Explanation of reference numerals: 1-tank truck cleaning area; 2-tank truck parking space; 3-water pipeline; 4-car washing tank; 5-crawler conveyor belt; 6-sand and gravel separator; 7-cyclone sedimentation tank; 8-sewage mixing system; 9-sewage concentration adjustment system; 10-container-type structural plate; 11-PLC intelligent electric control console; 12-coarse sand storage area; 13-stone storage area; 14-slag discharge port; 15-wear-resistant stirring impeller; 16-cyclone separation pump; 17-cyclone area; 18-feeding port; 19-overflow area; 20-fine sand discharge port; 21-cover plate; 22-stirring drill rod; 23-discharge port; 24-first water inlet; 25-control valve; 26-sewage treatment agent tank; 27-flow guide; 28-second stirring blade; 29-fixed frame; 30-sewage stirring motor; 31-drill rod; 32-first stirring blade; 33-sewage pump; 34-sewage concentration tester; 35-second water inlet; 36-clean water filling port; 37-liquid level meter; 38-PLC intelligent electronic control console; 39-water outlet; 40-laser radar; 41-intelligent camera; 42-vehicle scale limit; 43-crawler transmission motor; 44-sand and gravel separation control motor. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0029] Embodiment 1

[0030] As an example, Figures 1 to 5 As shown, the operation method of the concrete mixing plant waste recycling system comprises the following steps:

[0031] Step 1: The concrete tanker enters the tanker cleaning area 1 and parks on the tanker parking space 2; the upper water pipe 3 washes the tanker, and the concrete waste from the tanker enters the car wash tank 4 after washing; the right side of the car wash tank is connected to the sand and gravel separator 6, and the concrete waste flows to the sand and gravel separator 6 through the pipe for preliminary separation. The waste is repeatedly rolled between the spiral blades of the sand and gravel separator screen drum, and the screened stones are transported to the stone storage area through the crawler conveyor 5. The slurry water enters the cyclone sedimentation tank for further separation.

[0032] Step 2, arrangement of fine sand recovery system: slurry is injected into the cyclone sedimentation tank 7 through a pipeline. The top of the cyclone sedimentation tank 7 is a fine sand discharge port 20. Fine sand with smaller particles enters the top overflow area 19 through the cyclone in the cyclone area 17, and is discharged from the fine sand discharge port 20 at the top of the cyclone sedimentation tank 7 for decomposition and recovery. Coarse sand with larger particles in the cyclone sedimentation tank 7 will sink to the bottom due to gravity. A cyclone separation pump 16 is arranged at the bottom of the cyclone sedimentation tank 7. The cyclone separation pump 16 is connected to an agitator. The agitator is provided with a wear-resistant stirring impeller 15, which can beat the precipitated silt into turbulence, re-separate it, and increase the amount of fine sand recovery. Coarse sand with larger particles is discharged from the bottom slag discharge port 14 for separation. The other end of the bottom is a mud discharge port 23. The mud will enter the sewage mixing treatment system from the cyclone sedimentation tank 7.

[0033] 3. Layout of sewage mixing system: The sewage mixing system is installed in a mixing tank on the ground, and the container-type structural plate 10 is used on the outside, which is convenient and quick to install; sewage enters the sewage mixing system from the first water inlet 24, and the control valve 25 of the sewage treatment agent box 26 on the left is opened, and a proper amount of sewage treatment agent is injected for mixing. The sewage agitator is arranged with two oblique stirring blades. The stirring blades of two different lengths can better stir the sewage treatment agent. Each stirring blade is installed to an angle of 75° relative to the horizontal direction, so as to obtain a stronger stirring effect. At the same time, a transversely fixed guide member 27 is arranged in the mixing tank. After the motor 30 starts the drill rod to start stirring, the sewage treatment agent can fully react. The system sets the agitator to automatically stir intermittently to avoid the sedimentation and solidification of the mortar. After sufficient stirring, the sewage is pumped to the sewage concentration adjustment system through the sewage pump.

[0034] Step 4: Arrangement of sewage concentration regulating system: The sewage concentration regulating system is installed in the ground mixing tank and connected to the sewage mixing system. The sewage pump 33 of the sewage mixing system injects slurry water into the sewage concentration regulating system. A concentration tester 34 and a liquid level meter 37 are installed at the bottom of the sewage concentration regulating system. The concentration tester 34 can measure the sewage concentration in the mixing tank. The clean water replenishing device is started according to the sewage concentration setting value, and the clean water enters the mixing tank from the clean water filling port 36 to adjust the sewage concentration. After reaching the required setting value, it is recycled;

[0035] Step 5: Sewage recycling and reuse: The sewage after concentration adjustment passes through the sewage pump 33 and the metering system, and the recycled water after filtration can not only be used for washing tank trucks, equipment and sites, but also can be directly used for concrete production;

[0036] Embodiment 2

[0037] As another embodiment, this embodiment 2 proposes a more specific operation method of the waste recycling system of a concrete mixing station based on the embodiment 1:

[0038] Step 1: Concrete mixing station waste cleaning and recycling: The concrete transport tanker enters the tanker cleaning area 1 and parks on the tanker parking space 2; the upper water pipe 3 washes the tanker, and the concrete waste from the tanker enters the car wash tank 4 after washing; the right part of the car wash tank is connected to the sand and gravel separator 6, and the concrete waste flows to the sand and gravel separator 6 through the pipeline for preliminary separation. The waste is repeatedly rolled between the spiral blades of the sand and gravel separator screen drum, and the screened stones are transported to the stone storage area through the crawler conveyor 5. The slurry water enters the cyclone sedimentation tank 7 for further separation.

[0039] Step 2, fine sand recovery system layout: slurry water is injected into the cyclone sedimentation tank 7 through a pipeline, and fine sand with smaller particles enters the top overflow area 19 through the cyclone area 17, and is discharged from the fine sand discharge port at the top of the cyclone sedimentation tank 7 for decomposition and recovery; coarse sand with larger particles in the cyclone sedimentation tank 7 will sink to the bottom due to gravity, and a cyclone separation pump 16 is arranged at the bottom of the cyclone sedimentation tank 7, and the cyclone separation pump 16 is connected to the agitator, and a wear-resistant stirring impeller 15 is arranged on the agitator, which can beat the precipitated silt into turbulence, re-separate, and increase the recovery of fine sand. Coarse sand with larger particles is discharged from the bottom slag discharge port 14 for separation, and the other end of the bottom is the mud discharge port 23, and the mud will enter the sewage mixing treatment system from the cyclone sedimentation tank 7.

[0040] Step 3: Layout of sewage mixing system: The sewage mixing system is installed in a mixing tank on the ground. The system is set to automatically discharge sewage regularly to prevent siltation and eliminate manual cleaning. The form is overall mixing, and the container-type structural board 10 is used on the outside. The overall transportation is convenient and quick to install; the agitator in the system automatically stirs intermittently to prevent the mortar from settling and solidifying.

[0041] Step 4. Layout of sewage concentration regulating system: The sewage concentration regulating system is installed in the ground mixing tank and connected to the sewage mixing system. The sewage pump 33 of the sewage mixing system injects slurry water into the sewage concentration regulating system. A concentration tester 34 and a liquid level meter 37 are installed at the bottom of the sewage concentration regulating system. The concentration tester 34 can measure the sewage concentration in the mixing tank, and start the clean water replenishing device according to the sewage concentration setting value. The clean water enters the mixing tank from the clean water filling port 36 to adjust the sewage concentration. After reaching the required setting value, it is recycled.

[0042] Step 5: Sewage recycling and reuse: The sewage after concentration adjustment passes through the sewage pump 33 and the metering system, and the recycled water after filtration can not only be used for washing tank trucks, equipment and sites, but also can be directly used in the production of concrete.

[0043] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0044] Embodiment 3

[0045] As another embodiment, this embodiment 3 proposes a more specific operation method of the waste recycling system of a concrete mixing station based on the embodiments 1 and 2:

[0046] like Figure 1 As shown, the waste recycling system of the concrete mixing station is provided with a concrete tanker cleaning area 1. After the concrete tanker enters, it is parked on the tanker cleaning parking space 2. The upper water pipe 3 starts to clean the concrete tanker after receiving the command from the control console; the cleaned waste enters the sand and gravel separator 6. After spiral screening by the sand and gravel separator, the stone enters the stone storage area through the crawler conveyor 5, and the mortar water continues to enter the cyclone sedimentation tank 7 for cyclone separation, and the fine sand and coarse sand are separated from the mortar water; the mortar water continues to enter the sewage mixing system, and is fully mixed after adding the sewage treatment agent, and enters the sewage concentration adjustment system, and the sewage concentration is adjusted to the reusable range by the injection of clean water, and then re-enters the mixing system for utilization.

[0047] like Figure 2 As shown, fine sand recovery is carried out through the cyclone settling tank 7. The top of the cyclone settling tank 7 is a fine sand discharge port 20. The fine sand enters the overflow area 19 through the cyclone area 17 and then is recycled through the fine sand discharge port 20. The fine sand feed port 18 is located at the lower part of the overflow area 19. After the mortar enters, it first enters the lower cyclone area 17 for cyclone. A cyclone separation pump 16 is arranged at the lower part of the cyclone area. The cyclone separation pump 16 is connected to the mixing drill rod, and a wear-resistant mixing impeller 15 is arranged on the drill rod. After the cyclone separation pump is started, it drives the wear-resistant mixing impeller 15 to re-beat and split the lower precipitated silt, and the silt re-enters the cyclone area 17 to improve the fine sand recovery rate. The bottom of the cyclone settling tank 7 is a coarse sand discharge port 14 and a mortar discharge port 23. The coarse sand with larger particles is discharged from the discharge port 14, and the mortar water enters the sewage mixing system from the discharge port 23 at the other end.

[0048] like Figure 3 As shown, the sewage mixing system is externally a container-type structural plate 10, with a mixing motor arranged on the top, which is welded and fixed by a fixing frame 29, and the mixing motor is connected to the lower mixing drill rod, on which oblique mixing blades are arranged, and the first mixing blade 32 and the second mixing blade 28 are arranged crosswise, and the two mixing blades of different lengths can better mix the sewage treatment agent, and a guide member 27 is also arranged near the mixing blade, which can better mix and treat the sewage. After the sewage is mixed, it enters the sewage concentration adjustment system from the right outlet through the sewage pump 33.

[0049] like Figure 4As shown, the sewage after mixing in the sewage mixing system is pumped into the sewage concentration adjustment system through the sewage pump 33. A sewage concentration tester 34 is arranged at the bottom of the sewage concentration adjustment system, which can effectively measure the current sewage concentration. After the sewage concentration is measured, the electric control system controls the clean water on the right to enter through the clean water filling port 36 to adjust the sewage concentration to an available range. A liquid level meter 37 is fixed on the right side of the bottom of the sewage concentration adjustment system. Below the liquid level meter 37 is the outlet for sewage adjustment. The sewage that meets the recycling requirements re-enters the mixing system through the outlet and can be used for tank truck cleaning, concrete production, etc.

[0050] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0051] Embodiment 4

[0052] As another embodiment, the fourth embodiment is proposed on the basis of the first to third embodiments, such a waste recycling system of a concrete mixing station is provided with an intelligent electric control system of the mixing station, which is used to start or stop the whole system or a partial system according to the actual working conditions to cooperate with the work; the intelligent electric control system of the mixing station includes a vehicle scale limit 42, a laser radar 40, an intelligent camera 41, a water supply control system, a crawler transmission system, a sewage mixing system and a sewage concentration adjustment system, which are operated and controlled by a PLC intelligent electric control console 38; the vehicle scale limit 42 is arranged on the tank truck parking space 2, and intelligent cameras 41 are arranged around it, the laser radar 40 is arranged in the stone storage area 13, the tank truck cleaning area 1 is arranged with an intelligent camera 41, and the vehicle scale limit 42 is fixed at the bottom of the tank truck parking space 2, and the amount of concrete in and out of the tank truck can be directly recorded through the intelligent camera 41 and the vehicle scale limit 42. When the vehicle is parked in the parking space, the console can directly control the water supply pipeline 3 to clean the tank truck. Four laser radars 40 are arranged in the sand and gravel storage area. When there are too many stones delivered by the crawler conveyor 5 and insufficient storage space, the laser radar 40 can warn the staff to clean up. The entire concrete mixing station waste recycling system is controlled by the PLC intelligent electronic control console 38. The required pollution concentration and mixing rate and other parameters can be modified directly on the PLC intelligent electronic control console 38, reducing human resource loss and improving construction efficiency.

[0053] The concrete material carried by the vehicle can be directly recorded through the vehicle scale limit 42 and the smart camera 41, reducing manual intervention. When the gravel storage area is saturated and needs to be cleaned up, the laser radar can directly warn and remind the staff to clean up; when different parameters need to be adjusted for sewage treatment, the PLC smart electronic control console 38 can be directly operated to improve construction efficiency and ensure the safe and stable operation of the entire system.

[0054] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 to 3 can be referenced to each other and will not be described in detail in this application.

[0055] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. An operating method of a waste recycling system of a concrete mixing plant, characterized in that: The specific steps include: Step 1: Clean the concrete transport tank truck to obtain concrete waste, separate the stones and slurry water through a sand and gravel separator, and the slurry water enters a cyclone sedimentation tank; Step 2: The slurry is layered by cyclone in the cyclone settling tank. Fine sand with smaller particles enters the top overflow area, and coarse sand with larger particles sinks to the cyclone separation pump and is further separated into coarse sand and slurry. The slurry enters the sewage mixing system from the cyclone settling tank. Step 3: The sewage mixing system is installed in the mixing tank, and the slurry water is injected into the sewage concentration adjustment system; Step 4: The sewage concentration regulating system adjusts the sewage concentration and recycles it.

2. The method for operating a waste recycling system of a concrete mixing plant according to claim 1, characterized in that: In step 2, fine sand with smaller particles enters the top overflow area through the cyclone in the cyclone area, and is discharged from the fine sand discharge port at the top of the cyclone sedimentation tank for decomposition and recovery; coarse sand with larger particles in the cyclone sedimentation tank will sink to the bottom due to gravity, and a cyclone separation pump is arranged at the bottom of the cyclone sedimentation tank, and the cyclone separation pump is connected to the agitator, and the agitator is arranged with a wear-resistant stirring impeller, which beats the precipitated silt into turbulence and re-separates it, and the coarse sand with the largest particles is discharged from the slag discharge port at the bottom of the cyclone sedimentation tank for separation, and the other end of the bottom of the cyclone sedimentation tank is the mud discharge port, and the mud enters the sewage mixing system from the cyclone sedimentation tank; a screen is arranged in front of the discharge port pipe to improve the recovery rate of coarse sand.

3. The method for operating a waste recycling system of a concrete mixing plant according to claim 1, characterized in that: In step three, a sewage treatment agent tank is arranged outside the sewage mixing system, and the sewage treatment agent enters the sewage mixing tank in a quantitative manner through the lower control valve.

4. The method for operating a waste recycling system of a concrete mixing plant according to claim 1, characterized in that: In step three, a drill rod is provided in the sewage mixing system, and oblique stirring blades are arranged on the drill rod, including a first stirring blade and a second stirring blade. The first stirring blade and the second stirring blade are arranged crosswise and have different lengths. A guide piece is also arranged near the stirring blade.

5. The method for operating a waste recycling system of a concrete mixing plant according to claim 1, characterized in that: In step 4, the sewage concentration regulating system is installed in the ground mixing tank and connected to the sewage mixing system. The sewage pump of the sewage mixing system injects slurry water into the sewage concentration regulating system. A concentration tester and a liquid level meter are installed at the bottom of the sewage concentration regulating system. The concentration tester measures the sewage concentration in the mixing tank. The sewage enters the mixing tank from the clean water filling port according to the sewage concentration setting value to adjust the sewage concentration. After reaching the required setting value, the sewage is recycled. The sewage concentration tester in the mixing tank is fixed on the left side of the mixing tank, and the liquid level meter is fixed to the right inner wall of the mixing tank by bolts to better measure the sewage concentration and liquid level. The sewage after concentration adjustment is filtered by the sewage pump and the metering system, and the recycled water after filtration is utilized.

6. The method for operating a waste recycling system of a concrete mixing plant according to claim 1, characterized in that: An intelligent electronic control system for the mixing station is provided, which is used to start or stop the whole system or partial system according to the actual working conditions to cooperate with the work; the intelligent electronic control system of the mixing station includes vehicle scale limit, laser radar, intelligent camera, water supply control system, crawler transmission system, sewage mixing system and sewage concentration adjustment system, which are operated and controlled by PLC intelligent electronic control console; in step six, the vehicle scale limit is arranged on the parking space of the tank truck, and intelligent cameras are arranged around it. The laser radar is arranged in the stone storage area. When the stone and sand storage area is insufficient, it will automatically warn to remind the staff to clean up.

7. The method for operating a waste recycling system of a concrete mixing plant according to claim 1, characterized in that: In step one, a tanker cleaning area and a car wash trough are also provided at the front end of the sand and gravel separator; a tanker parking space is provided in the tanker cleaning area, and a water pipe is provided on the upper part of the tanker parking space for washing the tanker. The concrete delivery tanker enters the tanker cleaning area and is parked on the tanker parking space; the upper water pipe is used to wash the tanker, and the tanker concrete waste enters the car wash trough after washing; the car wash trough is connected to the sand and gravel separator, and the concrete waste flows to the sand and gravel separator through the pipe for preliminary separation. After the waste is screened in the sand and gravel separator, the stone is transported to the stone storage area by a crawler conveyor, and the slurry water enters the cyclone sedimentation tank for further separation.

8. A concrete mixing station waste recycling system and operation method, characterized in that: The waste recycling system of a concrete mixing plant is constructed by the construction method of any one of claims 1 to 7.

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