Recycling device for production wastewater of concrete mixing plant

Abstract

A concrete mixing plant production wastewater recycling device comprises a screening tank, a hopper with the open top end is fixed to the top end of the screening tank, a crushing mechanism is arranged at the lower end in the hopper, a first slag discharging opening is formed in the bottom end of the screening tank, a first slag discharging mechanism is arranged at the first slag discharging opening, and a supporting block is arranged in the screening tank; a vibrating screen is arranged above the supporting block, a spring is arranged between the vibrating screen and the supporting block, a vibrating motor is arranged at the bottom end of the vibrating screen, a stone discharging pipe is arranged on the screening tank, and the upper end of the stone discharging pipe is connected to the portion, above the vibrating screen, of the screening tank. A first water drainage pipe is arranged between the settling tank and the screening tank; a second slag discharge port is formed in the bottom end of the settling tank; a second valve body is arranged on the second slag discharge port; a filter element is arranged at the upper end in the settling tank, a settling pond is horizontally arranged below the right side of the settling tank, and a second water drainage pipe is arranged between the settling tank and the settling pond. The device is simple in structure and convenient to use.

Description

Technical Field

[0001] This utility model belongs to the field of concrete production technology, and in particular relates to a device for recycling wastewater from concrete mixing plants. Background Technology

[0002] With the development of municipal construction, batching plants that use centralized mixing and provide ready-mixed concrete have great advantages and have therefore developed rapidly. After transporting concrete, it is necessary to clean equipment such as concrete mixers and concrete trucks to prevent the concrete from hardening and hardening on the equipment, which would affect the next use of the equipment. Careful cleaning of the equipment requires a lot of water, and the wastewater after cleaning will carry sand, cement, and even hardened concrete. Direct discharge will cause a lot of waste of resources. In the current technology, concrete mixed with water is usually discharged directly into ditches, which not only causes environmental pollution, but also wastes water resources and other concrete raw materials. Utility Model Content

[0003] This invention addresses the technical problem of inconvenient and wasteful wastewater treatment in existing concrete mixing plants by providing a wastewater recycling device. The device includes a vertically arranged screening tank with an open-top hopper fixed to its top. The lower end of the hopper houses a crushing mechanism comprising two parallel and spaced-apart crushing rollers. Each roller has several crushing teeth for crushing concrete blocks. Both ends of the rollers are rotatably mounted on the hopper. A crushing motor is fixed to the outside of the hopper, and its power output shaft is connected to the crushing rollers. The motor is connected to a power source and a PLC controller via a cable. Starting the motor causes the two rollers to rotate via a gear assembly. The hardened concrete is crushed into small pieces by the crushing rollers and then falls into the screening tank. The bottom of the screening tank is equipped with a first slag discharge port, a first valve body, and a first slag discharge mechanism. The screening tank contains several support blocks, and an inclined vibrating screen is positioned above the support blocks. A spring connects the vibrating screen to the support blocks, and a vibrating motor is located at the bottom of the vibrating screen. A stone discharge pipe is located near the lower end of the vibrating screen, with its upper end connected to the screening tank above the vibrating screen. The vibrating motor is connected to a power source and a PLC controller via a cable. The concrete, crushed by the crushing rollers of the crushing mechanism, falls onto the vibrating screen. Larger, recyclable stones fall along the vibrating screen to the stone discharge pipe and are discharged. Fine cement and unusable sand and gravel particles fall through the filter holes on the vibrating screen to the lower end of the screening tank. A vertically arranged sedimentation tank is located on the right side of the screening tank. A first drain pipe is connected between the sedimentation tank and the screening tank. A chemical dosing port is located at the top of the sedimentation tank, through which disinfectant is added to the sedimentation tank to disinfect the water inside. A second slag discharge port is located at the bottom of the sedimentation tank, and a second valve body is installed on the second slag discharge port. A filter element that acts as a filter is located at the upper part of the interior of the sedimentation tank. A horizontally arranged sedimentation pool is located on the lower right side of the sedimentation tank, and a second drain pipe is connected between the sedimentation tank and the sedimentation pool. The lower end of the sedimentation pool has a semi-circular tube cross-section, and a second slag discharge mechanism is located at the lower part of the interior of the sedimentation pool. A third slag discharge port is located at the bottom left end of the sedimentation pool, and a third valve body is installed on the third slag discharge port.

[0004] Preferably, the first slag discharge mechanism and the second slag discharge mechanism have the same structure, both including a rotating shaft and auger blades set on the rotating shaft. One end of the rotating shaft is connected to a discharge motor that drives the rotating shaft to rotate. The discharge motor is connected to the power supply and PLC controller through a cable. When the discharge motor is started, the discharge motor drives the auger blades to rotate through the rotating shaft. The auger blades push the sediment in the screening tank and sedimentation tank to be discharged.

[0005] Preferably, the discharge motor inside the screening tank is provided with a protective shell for protection, and the discharge motor is fixed inside the screening tank by a support rod.

[0006] Preferably, a vertically arranged material distribution cone is provided at the upper part of the screening tank. The material distribution cone is fixed inside the screening tank by a support rod and is arranged coaxially with the hopper. The material distribution cone can disperse the concrete and water mixture falling into the hopper, which facilitates the screening of the vibrating screen and improves the screening efficiency.

[0007] Preferably, the screening tank is also equipped with a filter screen, which is located at the upper end of the first drain pipe.

[0008] Preferably, a belt conveyor is provided below the stone discharge pipe for conveying.

[0009] The above scheme has the following advantages:

[0010] The crushing mechanism can break down large pieces of concrete, making it easier to collect usable sand and gravel from the concrete and facilitate screening by the vibrating screen. The distribution cone can disperse the concrete-water mixture falling from the hopper, facilitating screening by the vibrating screen and improving screening efficiency. The first and second slag discharge mechanisms facilitate the discharge of concrete debris that has settled to the bottom of the screening tank and sedimentation tank, improving cleaning efficiency. The filter element further filters the water in the sedimentation tank, improving the quality of water resources. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0012] Reference numerals: 1. Screening tank; 2. Hopper; 3. First slag discharge mechanism; 4. Sedimentation tank; 5. Sedimentation pool; 10. Filter screen; 11. Vibrating screen; 12. Support block; 13. Spring; 14. Vibrating motor; 15. Stone discharge pipe; 16. Distribution cone; 17. First slag discharge port; 18. First valve body; 19. Belt conveyor; 21. Crushing mechanism; 22. Crushing roller; 31. Rotating shaft; 32. Screwdriver blade; 33. Discharge motor; 34. Protective shell; 41. Second slag discharge port; 42. Second valve body; 43. Filter element; 44. Chemical dosing port; 45. First drain pipe; 46. Second drain pipe; 51. Third slag discharge port; 52. Third valve body; 53. Second slag discharge mechanism. Detailed Implementation

[0013] like Figure 1As shown, a device for recycling wastewater from a concrete mixing plant includes a vertically arranged screening tank 1. A top-open hopper 2 is fixed to the top of the screening tank 1, and a crushing mechanism 21 is located at the lower end of the hopper 2. The crushing mechanism 21 includes two parallel and spaced-apart crushing rollers 22. Each crushing roller 22 has several crushing teeth for crushing concrete blocks. Both ends of the two crushing rollers 22 are rotatably mounted on the hopper 2. A crushing motor (not shown in the attached diagram) is fixed to the outside of the hopper 2. The power output shaft of the crushing motor is connected to the crushing rollers 22 via a transmission connection. The crushing motor is connected to a power source and a PLC controller via a cable. Starting the crushing motor, the crushing motor drives the two crushing rollers 22 to rotate via a gear assembly. The hardened concrete is crushed into small pieces by the crushing rollers 22 and then falls downwards into the screening tank 1. The bottom of the screening tank 1 is provided with a first slag discharge port 17, a first valve body 18 is provided on the first slag discharge port 17, a first slag discharge mechanism 3 is provided at the first slag discharge port 17, and several support blocks 12 are provided inside the screening tank 1. An inclined vibrating screen 11 is provided above the support blocks 12. A spring 13 is provided between the vibrating screen 11 and the support blocks 12, and a vibrating motor 14 is provided at the bottom of the vibrating screen 11. A stone discharge pipe 15 is provided on the screening tank 1 near the lower end of the vibrating screen 11. The upper end of the stone discharge pipe 15 is connected to the screening tank 1 above the vibrating screen 11. The vibrating motor 14 is connected to the power supply and PLC controller through a cable. The concrete crushed by the crushing roller 22 of the crushing mechanism 21 falls onto the vibrating screen 11. Larger recyclable stones fall along the vibrating screen 11 to the stone discharge pipe 15 and are discharged through the stone discharge pipe 15. Fine cement and unusable sand and gravel particles fall through the filter holes on the vibrating screen 11 to the lower end of the screening tank 1. A vertically arranged sedimentation tank 4 is provided on the right side of the screening tank 1. A first drain pipe 45 is provided between the sedimentation tank 4 and the screening tank 1. A chemical dosing port 44 is provided at the top of the sedimentation tank 4. Disinfectant is added into the sedimentation tank 4 through the chemical dosing port 44 to disinfect the water in the sedimentation tank 4. A second slag discharge port 41 is provided at the bottom of the sedimentation tank 4. A second valve body 42 is provided on the second slag discharge port 41. A filter element 43 is provided at the upper part of the interior of the sedimentation tank 4. A horizontally arranged sedimentation pool 5 is provided at the lower right side of the sedimentation tank 4. A second drain pipe 46 is provided between the sedimentation tank 4 and the sedimentation pool 5. The cross-section of the lower end of the sedimentation pool 5 is semi-circular. A second slag discharge mechanism 53 is provided at the lower part of the interior of the sedimentation pool 5. A third slag discharge port 51 is provided at the bottom left end of the sedimentation pool 5. A third valve body 52 is provided on the third slag discharge port 51.

[0014] Preferably, the first slag discharge mechanism 3 and the second slag discharge mechanism 53 have the same structure, both including a rotating shaft 31 and an auger blade 32 disposed on the rotating shaft 31. One end of the rotating shaft 31 is connected to a discharge motor 33 that drives the rotating shaft 31 to rotate. The discharge motor 33 is connected to the power supply and the PLC controller through a cable. When the discharge motor 33 is started, the discharge motor 33 drives the auger blade 32 to rotate through the rotating shaft 31. The auger blade 32 pushes the sediment in the screening tank 1 and the sedimentation tank 5 to be discharged.

[0015] Preferably, a protective shell 34 is provided on the outside of the discharge motor 33 inside the screening tank 1 to provide protection, and the discharge motor 33 is fixed inside the screening tank 1 by a support rod.

[0016] Preferably, the upper part of the screening tank 1 is provided with a vertically arranged material distribution cone 16. The material distribution cone 16 is fixed inside the screening tank 1 by a support rod, and the material distribution cone 16 is arranged coaxially with the hopper 2. The arrangement of the material distribution cone 16 can disperse the mixture of concrete and water falling into the hopper 2, which is convenient for the screening of the vibrating screen 11 and improves the screening efficiency.

[0017] Preferably, the screening tank 1 is also provided with a filter screen 10, which is located at the upper end of the first drain pipe 45.

[0018] Preferably, a belt conveyor 19 for conveying is provided below the stone discharge pipe 15.

[0019] In use, the cement mixture containing concrete is poured into the hopper 2, and the crushing mechanism 21 is activated. Under the action of the crushing roller 22, large pieces of hardened concrete are crushed and fall into the screening tank 1. During the falling process, the concrete is broken up by the action of the distribution cone 16 and falls onto the vibrating screen 11. Under the action of the vibrating motor 14, the larger particles and recyclable stones in the crushed concrete are screened out and discharged into the screening tank 1 through the stone discharge pipe 15. Fine mud and water fall into the screening tank 1 through the filter holes on the vibrating screen 11. The sediment settles to the lower end of the screening tank 1 under its own gravity. The water in the upper layer enters the sedimentation tank 4 through the first drain pipe 45. Disinfectant is added to the sedimentation tank 4 through the dosing port 44 to disinfect the water in the sedimentation tank 4. The cement mixture in the sedimentation tank 4 will settle again. The water in the sedimentation tank 4 is further filtered by the filter element 43 and discharged into the sedimentation tank 5 through the second drain pipe 46. The discharge motor 33 drives the auger blades 32 to rotate through the rotating shaft 31. The auger blades 32 push the sediment in the screening tank 1 and the sedimentation tank 5 to be discharged.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A device for recycling wastewater from a concrete mixing plant, comprising a vertically arranged screening tank, a top-open hopper fixed to the top of the screening tank, and a crushing mechanism provided at the lower end of the hopper, characterized in that: The screening tank has a first slag discharge port at its bottom, a first valve body on the first slag discharge port, and a first slag discharge mechanism at the first slag discharge port. The screening tank contains several support blocks, and an inclined vibrating screen is positioned above the support blocks. A spring is installed between the vibrating screen and the support blocks, and a vibrating motor is located at the bottom of the vibrating screen. A stone discharge pipe is located on the screening tank near the lower end of the vibrating screen, and the upper end of the stone discharge pipe is connected to the screening tank above the vibrating screen. A vertically positioned sedimentation tank is located on the right side of the screening tank, with a first drain pipe between the sedimentation tank and the screening tank. A chemical dosing port is located at the top of the sedimentation tank, and a second slag discharge port is located at its bottom, with a second valve body on the second slag discharge port. A filter element for filtration is located at the upper part of the interior of the sedimentation tank, and a horizontally positioned sedimentation pool is located below the right side of the sedimentation tank. A second drain pipe is located between the sedimentation tank and the sedimentation pool.

2. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 1, characterized in that: The lower end of the sedimentation tank has a semi-circular tube-shaped cross-section, and a second slag discharge mechanism is provided at the lower end of the sedimentation tank. A third slag discharge port is provided at the bottom left end of the sedimentation tank, and a third valve body is provided on the third slag discharge port.

3. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 2, characterized in that: The first and second slag discharge mechanisms have the same structure, both including a rotating shaft and auger blades mounted on the rotating shaft, and one end of the rotating shaft is connected to a discharge motor that drives the rotating shaft to rotate.

4. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 3, characterized in that: The discharge motor inside the screening tank is equipped with a protective shell, and the discharge motor is fixed inside the screening tank by a support rod.

5. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 1, characterized in that: The crushing mechanism includes two parallel and spaced-apart crushing rollers. Each crushing roller is fixed with several crushing teeth for crushing concrete blocks. Both ends of the two crushing rollers can be rotatably mounted on a hopper. A crushing motor is fixed on the outside of the hopper, and the power output shaft of the crushing motor is connected to the crushing rollers via a transmission.

6. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 1, characterized in that: The upper part of the screening tank is equipped with a vertically arranged material distribution cone. The material distribution cone is fixed inside the screening tank by a support rod, and the material distribution cone is arranged coaxially with the hopper.

7. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 1, characterized in that: The screening tank is also equipped with a filter screen, which is located at the upper end of the first drain pipe.

8. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 1, characterized in that: A belt conveyor is installed below the stone discharge pipe to carry the stones.

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