A mixed aggregate grading and water washing recovery mechanism

Abstract

The utility model belongs to concrete mixing station technical field especially relates to a kind of mixed aggregate grading and washing recovery mechanism. Including: grading system: including the discharge hopper connected in turn, feeding belt conveyor, double-deck vibrating screen, swing belt conveyor, stone washing yard;Spraying system: including the clean water pool connected in turn, clean water pump, spray pipe network, and several spray heads are installed on spray pipe network, and spray pipe network is located above double-deck vibrating screen;Sand recovery system: including the water bucket connected in turn, slurry pump, cyclone, dewatering screen, sand recovery belt conveyor, sand yard, and water bucket is fixed to the sieve underlay output end of double-deck vibrating screen.The utility model has organically integrated grading system, spraying system and sand recovery system, and all processes such as feeding, grading, washing, sand-water separation and sand recovery dehydration are continuously completed, and process is compact, and efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to concrete mixing station technical field, especially relates to a mixed aggregate grading and washing recovery mechanism. BACKGROUND

[0002] In the field of concrete production, the natural aggregate used often contains impurities such as soil and stone powder, and must be washed to meet the production standards. At present, the common stone washing equipment is mostly single-layer screen structure, and has the following obvious disadvantages: first, it cannot effectively grade the mixed aggregate with complex gradation, and can only produce single-specification stones or mixed materials; second, in the washing process, a large amount of valuable fine sand is lost with the flushing water, not only causing resource waste and increasing raw material cost, but also greatly increasing the sedimentation load of the slurry tank and the difficulty of subsequent water treatment after the fine sand enters the sewage system.

[0003] Therefore, there is an urgent need in the field for an efficient and environmentally friendly comprehensive treatment equipment that integrates aggregate grading, washing and fine sand recovery. SUMMARY

[0004] The utility model discloses a kind of mixed aggregate grading and washing recovery mechanism, to solve the problems existing in prior art.

[0005] The utility model discloses the technical scheme that the technical problem thereof adopts is as follows: A mixed aggregate grading and washing recovery mechanism, comprising: A grading system comprising a discharge hopper, a feeding belt conveyor, a double-deck vibrating screen, a swing belt conveyor and a stone washing yard connected in sequence. A spraying system comprising a clean water pool, a clean water pump and a spraying pipe network connected in sequence, wherein a plurality of spray heads are installed on the spraying pipe network, and the spraying pipe network is located above the double-deck vibrating screen. A sand recovery system comprising a water bucket, a slurry pump, a cyclone, a dehydration screen, a sand recovery belt conveyor and a sand storage yard connected in sequence, wherein the water bucket is fixed to the discharge end of the double-deck vibrating screen.

[0006] Further, the output end of the discharge hopper is provided with two discharge doors.

[0007] Further, the swing belt conveyor has two units, the input ends of the two units are connected to the two discharge ends of the double-deck vibrating screen respectively, and the stone washing yard has two units corresponding to the two swing belt conveyors respectively.

[0008] Further, the spray heads on the spraying pipe network are arranged to align with the screen area of the double-deck vibrating screen.

[0009] Further, the water bucket output end is connected to the slurry pump through a pipeline, the slurry pump output end is connected to the cyclone inlet end through a pipeline, and the fine sand output end of the cyclone is connected to the dehydration screen.

[0010] Furthermore, the sand recovery system also includes a mud tank, and the overflow port of the hydrocyclone and the undersize output end of the dewatering screen are all connected to the mud tank via pipelines.

[0011] This utility model has the following beneficial effects: 1. This utility model organically integrates the grading system, spraying system and sand recovery system, and continuously completes all processes such as feeding, grading, washing, sand-water separation and sand recovery dewatering. The process is compact and efficient.

[0012] 2. The use of a double-layer vibrating screen can accurately separate mixed aggregates into two different sizes of clean stones, which are then transported to different stockpiles via their respective oscillating belt conveyors, thereby increasing the added value and market adaptability of the products.

[0013] 3. The sand recovery system can efficiently recover fine sand from washing wastewater, turning waste into treasure, significantly reducing the loss of high-quality sand resources and lowering production costs.

[0014] 4. The optional water circulation loop design allows for the recycling of flushing water, greatly reducing the consumption of fresh water and the amount of wastewater discharged, which meets the requirements of green and environmentally friendly production.

[0015] 5. The double discharge gate design of the discharge hopper allows for control of the material flow, ensuring the uniformity and continuity of feeding and providing a guarantee for the stable operation of the downstream processing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the elevation structure of this utility model.

[0017] Figure 2 This is a top view of the structure of this utility model.

[0018] Figure 3 This is a utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0019] Figure 4 This is a utility model Figure 1 Enlarged structural diagram at point B.

[0020] Figure 5 This is a utility model Figure 2 Schematic diagram of the structure at point C.

[0021] The components include: 1. Unloading hopper; 2. Feeding conveyor belt; 3. Double-layer vibrating screen; 4. Clean water pump; 5. Slurry pump; 6. Hydrocyclone; 7. Dewatering screen; 8. Sand recovery conveyor belt; 9. Swing conveyor belt; 10. Stone washing stockpile; 11. Sand stockpile; 12. Mud pit; 13. Clean water pit; 14. Spraying pipe network; 15. Water tank; 16. Unloading gate; 17. Spray nozzle. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of the utility model.

[0023] like Figures 1-5 As shown, a mixed aggregate grading and washing recycling mechanism includes: The grading system consists of a discharge hopper 1, a feeding belt conveyor 2, a double-layer vibrating screen 3, and a swing belt conveyor 9 connected in sequence. The discharge hopper 1 has two discharge gates 16 at its bottom for controlling the feed rate. The feed end of the feeding belt conveyor 2 is located directly below the discharge port of the discharge hopper 1, used to receive and transport the mixed aggregates. The feed port of the double-layer vibrating screen 3 is located below the discharge end of the feeding belt conveyor 2, used to receive incoming materials and perform vibratory screening and washing. Two swing belt conveyors 9 are provided, with their feed ends respectively located below the upper and lower screen outlets of the double-layer vibrating screen 3. They can be connected via chutes. For example, one end of the chute can be fixed to the upper screen outlet, and the other end can be located above the swing belt conveyor 9 (at its swing axis), used to transport the two grades of stones to different washing stockpiles 10.

[0024] The spraying system consists of a clear water tank 13, a clear water pump 4, and a spraying pipe network 14 connected sequentially by pipes. The spraying pipe network 14 is fixedly installed above the double-layer vibrating screen 3, and multiple nozzles 17 are evenly arranged on it. The spraying direction of the nozzles 17 is aimed at the screen area of ​​the double-layer vibrating screen 3, and is used for high-pressure washing during the aggregate screening process to remove mud and stone powder adhering to the surface of the aggregate.

[0025] The sand recovery system consists of a water hopper 15, a slurry pump 5, a hydrocyclone 6, a dewatering screen 7, and a sand recovery conveyor belt 8 connected in sequence. The water hopper 15 is fixedly installed directly below the outlet of the undersize material of the double-layer vibrating screen 3 to collect the slurry generated during the washing process. The inlet of the slurry pump 5 is connected to the outlet of the water hopper 15 via a pipe, and the outlet is connected to the inlet 22 of the hydrocyclone 6 via a pipe, used to pump the slurry into the hydrocyclone 6. The underflow outlet of the hydrocyclone 6 is located above the inlet end of the dewatering screen 7, used to discharge the separated fine sand to the dewatering screen 7; its overflow outlet is connected to the mud tank 12 via a pipe, used to discharge the separated slurry water to the mud tank 12. The outlet end of the dewatering screen 7 is connected to the inlet end of the sand recovery conveyor belt 8, used to dewater the fine sand and transport the dewatered finished sand to the sand stockpile 11. The undersize material discharge pipe of the dewatering screen 7 is connected to the mud tank 12, thereby discharging the filtered slurry into the mud tank 12.

[0026] The working principle of this utility model is as follows: Grading and Washing Process: The loader loads the mixed aggregate to be processed into the discharge hopper 1. The feed rate can be controlled by adjusting the opening of the two discharge gates 16 at the bottom of the discharge hopper 1. The mixed aggregate then falls evenly onto the feeding conveyor 2 and is conveyed to the feed inlet of the double-layer vibrating screen 3. At the same time, the clean water pump 4 is started, pumping water from the clean water tank 13 into the spray pipe network 14 arranged above the double-layer vibrating screen 3, and powerfully washing the aggregate on the screen surface through dense nozzles 17. Under the combined action of vibration and washing, the aggregate is cleaned and screened into two specifications according to particle size: large-diameter stones on the upper screen and medium and small-diameter stones on the lower screen. These two types of clean stones are discharged from the upper screen outlet and the lower screen outlet, respectively, and are conveyed to different washing stockpiles 10 by two corresponding oscillating conveyor belts 9.

[0027] Fine sand recovery process: The slurry (a mixture of water, mud, and fine sand) generated during washing passes through the screen of the double-layer vibrating screen 3 and falls from the undersize outlet into the fixed water hopper 15. The slurry pump 5 draws the slurry from the water hopper 15 and sends it tangentially into the hydrocyclone 6 through the hydrocyclone inlet under a certain pressure. Under the action of the strong centrifugal force field inside the hydrocyclone 6, the denser fine sand is thrown against the wall and spirals down, eventually being discharged from the bottom outlet and falling onto the screen surface of the dewatering screen 7; while the muddy water containing a small amount of fine particles is discharged from the overflow outlet and enters the mud tank 12. The wet sand falling on the dewatering screen 7 is further filtered of water under the action of vibration, forming finished sand with a lower moisture content, which is finally transported to the sand stockpile 11 by the sand recovery belt conveyor 8. The water filtered out by the dewatering screen 7 enters the mud tank 12.

[0028] Water circulation process: In order to achieve water conservation, the mud water in mud tank 12 can be further filtered or settled to purify it. The purified water can be returned to clear water tank 13 to replenish the water used in the spray system, thus forming a closed-loop circulating water system and realizing the reuse of water resources.

[0029] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention.

[0030] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A mixed aggregate grading and washing recycling mechanism, characterized in that, include: Grading system: includes a discharge hopper, a feeding belt conveyor, a double-layer vibrating screen, a swing belt conveyor, and a stone washing stockpile connected in sequence; Sprinkler system: includes a clear water tank, a clear water pump, and a sprinkler network connected in sequence. Several spray nozzles are installed on the sprinkler network, which is located above the double-layer vibrating screen. Sand recovery system: includes a water bucket, slurry pump, hydrocyclone, dewatering screen, sand recovery belt conveyor, and sand stockpile connected in sequence. The water bucket is fixed to the undersize output end of the double-layer vibrating screen.

2. The mixed aggregate grading and washing recycling mechanism according to claim 1, characterized in that, The output end of the unloading hopper is equipped with two unloading gates.

3. The mixed aggregate grading and washing recycling mechanism according to claim 1, characterized in that, There are two oscillating belt conveyors. The input ends of the two oscillating belt conveyors are respectively connected to the output ends of the two screens of the double-layer vibrating screen. The stone washing yard has two oscillating belt conveyors corresponding to the two screens.

4. The mixed aggregate grading and washing recycling mechanism according to claim 1, characterized in that, The spray nozzles on the spray pipe network are arranged to be aligned with the screen area of ​​the double-layer vibrating screen.

5. The mixed aggregate grading and washing recycling mechanism according to claim 1, characterized in that, The water bucket output pipe is connected to the slurry pump, the slurry pump output pipe is connected to the feed end of the hydrocyclone, and the fine sand output end of the hydrocyclone is connected to the dewatering screen.

6. The mixed aggregate grading and washing recycling mechanism according to claim 1, characterized in that, The sand recovery system also includes a mud tank, and the overflow port of the hydrocyclone and the undersize output end of the dewatering screen are all connected to the mud tank by pipes.

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