Recycling method of premixed concrete wastewater, waste slurry and solid waste garbage

Abstract

The invention discloses a recycling method for premixed concrete waste water, waste slurry and solid waste garbage, and relates to the field of premixed concrete.The method comprises the steps that collected waste slurry generated by tank car cleaning is transferred to a sand-gravel separator through a tank car, the waste slurry is directly poured into the sand-gravel separator, the sand-gravel separator conducts vibration screening on fixing materials, and then the fixing materials are recycled; meanwhile, the gravels are washed, the surfaces of the gravels are clean, then moisture on the surfaces of the gravels is thrown away, and the separated recycled slurry is recycled after being subjected to homogenization treatment, sedimentation treatment, dilution treatment or filter pressing treatment, so that the moisture on the surfaces of the gravels entering the collecting pool can be reduced after the gravels are washed, and the recycling efficiency of the gravels is improved. And the air-drying use time of the subsequent gravel is shortened.

Description

Technical Field

[0001] This application relates to the field of ready-mixed concrete, and in particular to a method for recycling waste water, waste slurry, and solid waste in ready-mixed concrete. Background Art

[0002] In the production of ready-mixed concrete, during the production process of a concrete mixing plant, waste concrete needs to be separated. Waste water is generated during this process. The tilting of the mixer after completing the daily production task, the cleaning of the tanker, etc. will all generate waste water, waste slurry, and waste materials. The generation of these waste water, waste slurry, and waste materials not only affects the environment but also poses challenges to the green production and sustainable development of enterprises. Therefore, ready-mixed concrete enterprises need to take effective recycling measures to reduce the generation of waste water, waste slurry, and waste materials and achieve green production.

[0003] When treating waste water, waste slurry, and waste materials, the waste water is collected in a unified water collection tank for preliminary solid-liquid separation to remove large particle impurities and suspended solids, and then the organic matter is degraded and removed through an aerobic bioreactor to further purify the water body. The waste slurry directly enters the sedimentation tank for sedimentation, and the waste slurry meeting the concentration is reused for the production of concrete. The waste materials mixed with the waste slurry need to be separated from the sand and gravel by a sand and gravel separator, and then the sand and gravel are recycled.

[0004] When separating waste slurry from sand and gravel using a sand and gravel separator, generally, the sand and gravel and waste slurry are directly poured into the sand and gravel separator. The oscillating screen in the sand and gravel separator blocks the sand and gravel, while the waste slurry directly passes through the vibrating screen and is collected. When screening the sand and gravel on the oscillating screen, in order to reduce the attachments on the sand and gravel, clean water is used for washing, which may cause a large amount of water to adhere to the surface of the sand and gravel, resulting in the sand and gravel being wet and piled up in the collection tank, and it takes a long time to dry before it can be reused. Summary of the Invention

[0005] The purpose of this application is to solve the problem that in order to reduce the attachments on the sand and gravel, clean water is used for washing, which may cause a large amount of water to adhere to the surface of the sand and gravel, resulting in the sand and gravel being wet and piled up in the collection tank, and it takes a long time to dry before it can be reused as mentioned in the above background art. This application provides a method for recycling waste water, waste slurry, and solid waste in ready-mixed concrete.

[0006] To achieve the above purpose, this application specifically adopts the following technical solutions: A method for recycling waste water, waste slurry, and solid waste in ready-mixed concrete, and this recycling method is as follows: S1: First, collect the waste water, waste slurry, and solid waste generated during the processes of experiment, production, and equipment cleaning in the ready-mixed concrete plant; S2: The wastewater is then collected into a unified water collection tank for preliminary solid-liquid separation to remove large particle impurities and suspended solids. The pretreated water is sent to the biological treatment system to degrade and remove organic matter through an aerobic bioreactor, so that the water is further purified; S3: Then use membrane technology to further filter the biologically treated water to remove tiny particles and colloids, making the water cleaner and completing wastewater treatment. The treated wastewater can be directly used in the production and testing of ready-mixed concrete; S4: The waste slurry generated by the tank truck cleaning is transferred to the sand and gravel separator by a tank truck, and the waste slurry is directly dumped into the sand and gravel separator. The sand and gravel separator vibrates and screens the fixed materials, and washes the sand and gravel to make the surface of the sand and gravel clean. Then, the water on the surface of the sand and gravel is removed, and the separated recovered slurry is recycled after homogenization, sedimentation, dilution or filter pressing. S5: The recycled slurry and the waste slurry are sent to the homogenization tank for homogenization treatment, and then the mixture of the recycled slurry and the waste slurry is sent to the sedimentation tank. The water above the sedimentation tank is then recycled for wastewater treatment, and the sedimentation slurry below is diluted with mixing water and used for concrete production after passing the inspection; S6: Solid waste such as waste concrete blocks can replace the coarse aggregate required for concrete preparation after crushing, and can also be further crushed to replace fine aggregate to prepare bricklaying mortar or plastering mortar.

[0007] Furthermore, the sand and gravel separator includes two symmetrical support frames, an oscillating screen is installed between the two support frames, two symmetrical vibration motors are installed on the oscillating screen, a wastewater collection cabin is installed between the two support frames, the wastewater collection cabin corresponds to the oscillating screen, a flushing pipe is installed on the oscillating screen, a collecting pool is provided at the discharge end of the oscillating screen, a support seat is fixed in the collecting pool, a water throwing mechanism is provided on the support seat, and an auxiliary drying mechanism is provided on the support seat.

[0008] By adopting the above technical scheme, sand and gravel fall into the water-throwing mechanism from the discharge end of the oscillating screen, and the water-throwing mechanism throws off the water on the surface of the sand and gravel. While the water-throwing mechanism rotates, the water-throwing mechanism drives the auxiliary drying mechanism, and the auxiliary drying mechanism blows air to the sand and gravel in the water-throwing mechanism to assist the sand and gravel in removing the surface water. Then the sand and gravel fall into the collection pool from the water-throwing mechanism, so that after the sand and gravel are washed, the moisture on the surface of the sand and gravel entering the collection pool can be reduced, thereby reducing the time required for subsequent sand and gravel to be dried for use.

[0009] Furthermore, the water-throwing mechanism includes a support plate fixed between two support frames, a support ring is fixed on the support plate, a water-throwing support cylinder is arranged on the support ring, a water-throwing net cylinder is arranged on the water-throwing support cylinder, a rotating seat is arranged at the end of the water-throwing net cylinder away from the water-throwing support cylinder, the rotating seat is in conflict with the water-throwing net cylinder, the rotating seat is rotatably connected with the support seat, a water collecting plate is fixed on the water-throwing net cylinder, a driving assembly is arranged between the support ring and the water-throwing support cylinder, a buffer feeding assembly is arranged on the support plate, and a feeding assembly is arranged between the water-throwing support cylinder and the water-throwing net cylinder.

[0010] By adopting the above technical scheme, sand and gravel enter the water-throwing support cylinder and the water-throwing net cylinder from the buffer feeding assembly, the driving assembly drives the water-throwing support cylinder to rotate, the water-throwing support cylinder drives the water-throwing net cylinder, and the water-throwing net cylinder drives the support seat, so that the sand and gravel rotate with it, and the moisture on the surface of the sand and gravel is thrown into the ring formed by the water collecting plate, thereby reducing the moisture on the surface of the sand and gravel after being washed, and reducing the possibility that the sand and gravel need to be dried for a long time before being used again.

[0011] Furthermore, the driving assembly includes a driving motor fixed on the support plate, the output end of the driving motor passes through the support plate and is fixed with a driving gear, the support ring is rotatably connected with a driving ring gear, the driving ring gear is meshed with the driving gear, and the driving ring gear is fixedly connected to the water-throwing support cylinder.

[0012] By adopting the above technical solution, the driving motor drives the driving gear ring to rotate, and the driving gear ring drives the water-throwing support cylinder, so that the support cylinder can rotate under the support of the support ring.

[0013] Furthermore, the unloading assembly includes two sliding blocks symmetrically fixed on the water-throwing net cylinder, and two symmetrical sliding grooves are opened on the water-throwing support cylinder. The sliding block is located in the sliding groove and is slidably connected to the water-throwing support cylinder. Two symmetrical fixed blocks are fixed on the water-throwing support cylinder, and a hydraulic telescopic rod 1 is fixed on the fixed block, and the telescopic end of the hydraulic telescopic rod 1 is fixedly connected to the sliding block.

[0014] By adopting the above technical solution, the sliding block drives the water-throwing net cylinder to move toward the water-throwing support cylinder, so that a gap is generated between the water-throwing net cylinder and the rotating seat, allowing sand and gravel to pass through the gap between the water-throwing net cylinder and the rotating seat and fall into the collection pool, thereby making it convenient for sand and gravel to fall from the water-throwing net cylinder into the collection pool.

[0015] Furthermore, a plurality of circumferentially distributed engaging teeth are fixed to one end of the water-throwing net cylinder close to the rotating seat, and tooth grooves corresponding to the engaging teeth are formed on the rotating seat.

[0016] By adopting the above technical solution, the engaging teeth on the water throwing net cylinder are inserted into the tooth grooves on the rotating seat, so that the rotating seat can be conveniently rotated, and the sand and gravel in the water throwing net cylinder can follow the rotation.

[0017] Further, the buffer feeding assembly includes a feeding hopper fixed on the support plate. The feeding hopper penetrates through the support plate and corresponds to the water throwing support cylinder. A sliding baffle is slidably mounted on the feeding hopper. A second hydraulic telescopic rod is arranged between the sliding baffle and the feeding hopper. The second hydraulic telescopic rod is fixedly connected with the feeding hopper, and the telescopic end of the second hydraulic telescopic rod is fixedly connected with the sliding baffle.

[0018] By adopting the above technical solution, when the vibrating screen drops the sand and gravel from the discharge end, the sand and gravel directly fall into the feeding hopper. After the sand and gravel accumulate, the sliding baffle slides open from the feeding hopper, and the sand and gravel enter the water throwing support cylinder from the feeding hopper, so that the sand and gravel can enter the water throwing support cylinder in batches, and at the same time, it does not prevent the vibrating screen from continuing to discharge materials.

[0019] Further, the auxiliary drying mechanism includes a connecting frame fixed on the support ring. A protective cylinder is fixed on the connecting frame. A rotating rod is arranged in the protective cylinder. One end of the rotating rod is rotatably connected with the connecting frame. A plurality of fan plates distributed circumferentially are fixed on the rotating rod. A plurality of corresponding air outlet holes and air inlet holes are formed in the protective cylinder. A rotating assembly is arranged between the rotating rod and the rotating seat.

[0020] By adopting the above technical solution, the rotating seat drives the rotating assembly, the rotating assembly drives the rotating rod, and the rotating rod drives the fan plates to rotate under the support of the connecting frame. The fan plates rotate in the protective cylinder to accelerate the air flow in the water throwing net cylinder, so that the air flow in the water throwing net cylinder can be accelerated while the sand and gravel are being dewatered, and further reduce the moisture attached to the surface of the sand and gravel.

[0021] Further, the rotating assembly includes a rotating gear ring fixed on the rotating seat. A second rotating gear is meshed with the rotating gear ring. The second rotating gear is rotatably connected with the protective cylinder. A first rotating gear is fixed on the rotating rod. The first rotating gear is meshed with the second rotating gear.

[0022] By adopting the above technical solution, the rotating gear ring drives the rotating rod to rotate under the speed change of the first rotating gear and the second rotating gear, so that the rotating rod can rotate simultaneously while the rotating seat rotates, and the rotating rod drives the fan plates to fan.

[0023] In summary, the present application includes at least one of the following beneficial effects; 1. In this application, by allowing sand and gravel to enter the water-throwing support cylinder and the water-throwing mesh cylinder, the drive motor on the support plate drives the drive gear to rotate. The drive gear drives the drive gear ring to rotate, and the drive gear ring drives the water-throwing support cylinder to rotate under the support of the support ring. The water-throwing support cylinder drives the water-throwing mesh cylinder, and the water-throwing mesh cylinder drives the rotating seat, causing the sand and gravel to rotate to generate centrifugal force. The water on the surface of the sand and gravel is thrown into the water-collecting plate and absorbed by the water-absorbing filler in the water-collecting plate. Then, the hydraulic extension rod 1 on the fixed block drives the sliding block, and the sliding block slides in the sliding groove. The sliding block drives the water-throwing mesh cylinder to move towards the water-throwing support cylinder, creating a gap between the water-throwing mesh cylinder and the rotating seat. The sand and gravel pass through the gap between the water-throwing mesh cylinder and the rotating seat and fall into the collection pool, achieving the purpose of reducing the water on the surface of the sand and gravel entering the collection pool after being washed and reducing the subsequent drying time required for the sand and gravel.

[0024] 2. In this application, while the rotating seat is rotating, the rotating seat drives the rotating gear ring, the rotating gear ring drives the second rotating gear on the protection cylinder, the second rotating gear drives the first rotating gear, the first rotating gear drives the rotating rod to rotate, and the rotating rod drives the fan plate to rotate. The fan plate accelerates the air flow in the water-throwing mesh cylinder during the rotation of the protection cylinder, and blows air on the sand and gravel being dewatered, achieving the purpose of accelerating the air flow in the water-throwing mesh cylinder while the sand and gravel are being dewatered, further reducing the water attached to the surface of the sand and gravel, and further reducing the subsequent drying time required for the sand and gravel.

[0025] 3. In this application, when the oscillating screen drops the sand and gravel from the discharge end, the sand and gravel directly fall into the feed hopper. After the sand and gravel accumulate, the hydraulic extension rod 2 drives the sliding baffle, and the sliding baffle slides open from the feed hopper. The sand and gravel enter the water-throwing support cylinder from the feed hopper, and then the sand and gravel in the water-throwing support cylinder are dewatered. The feed hopper closes the sliding baffle and continues to receive the sand and gravel falling from the oscillating screen, achieving the purpose of allowing the sand and gravel to enter the water-throwing support cylinder in batches without interfering with the continuous discharging of the oscillating screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the first three-dimensional structural schematic diagram of the sand and gravel separator in this application; Figure 2 is the internal structural schematic diagram of the sand and gravel separator in this application; Figure 3 is the internal structural schematic diagram of the drying mechanism in this application; Figure 4 is this application Figure 3 the enlarged schematic diagram at position A in; Figure 5 is this application Figure 3 the enlarged schematic diagram at position B in; Figure 6 is this applicationFigure 3 Enlarged schematic diagram at position C in the middle.

[0027] Explanation of reference numerals in the drawings: 1. Oscillating screen; 2. Vibration motor; 3. Support frame; 4. Wastewater collection tank; 5. Flushing pipeline; 6. Water throwing mechanism; 61. Support plate; 62. Support ring; 63. Water throwing support cylinder; 64. Water throwing mesh cylinder; 65. Driving assembly; 651. Driving motor; 652. Driving gear; 653. Driving gear ring; 66. Buffer feeding assembly; 661. Feeding hopper; 662. Sliding baffle; 663. Second hydraulic telescopic rod; 67. Feeding component; 671. Sliding block; 672. Sliding groove; 673. Fixed block; 674. First hydraulic telescopic rod; 675. Engaging teeth; 68. Rotating seat; 69. Water collecting plate; 7. Auxiliary drying mechanism; 71. Connecting frame; 72. Rotating rod; 73. Fan plate; 74. Protection cylinder; 75. Rotating component; 751. First rotating gear; 752. Second rotating gear; 753. Rotating gear ring; 8. Collection pool; 9. Support base. Detailed implementation manners

[0028] The following further describes this application in detail with reference to Figure 1 —6.

[0029] The embodiment of this application discloses a method for recycling waste water, waste slurry and solid waste in ready-mixed concrete.

[0030] A method for recycling waste water, waste slurry and solid waste in ready-mixed concrete, the recycling method is as follows: S1: First, collect the waste water, waste slurry and solid waste generated during the processes of experiment, production and equipment cleaning in the ready-mixed concrete plant; S2: Then collect the waste water into a unified water collection tank, conduct preliminary solid-liquid separation treatment to remove large particle impurities and suspended matters, send the pretreated water body to the biological treatment system, and degrade and remove organic matters through an aerobic bioreactor to further purify the water body; S3: Then further filter the water body after biological treatment by membrane technology to remove fine particles and colloidal substances to make the water quality cleaner, complete the waste water treatment, and the treated waste water can be directly used for the production and experiment of ready-mixed concrete; S4: Transfer the waste slurry generated by the cleaning of the tanker to the sand and stone separator by the tanker, directly pour the waste slurry into the sand and stone separator, the sand and stone separator vibrates and screens the fixed materials, and washes the sand and stone at the same time to make the surface of the sand and stone clean, then remove the water on the surface of the sand and stone, and the recovered slurry is recycled after homogenization treatment, precipitation treatment, dilution treatment or pressure filtration treatment; S5: Feed the recycled pulp and waste pulp into a homogenizing tank for homogenization treatment. Then, transfer the mixture of recycled pulp and waste pulp to a sedimentation tank. Next, recover the wastewater from the water above the sedimentation tank, and dilute the sediment slurry at the bottom with mixing water. After passing the inspection, it can be used in concrete production. S6: Solid wastes such as waste concrete blocks can replace the coarse aggregate required for concrete preparation after being crushed, or can be further crushed to replace the fine aggregate for preparing mortar for bricklaying or plastering mortar.

[0031] Refer to Figure 1 、 Figure 2 and Figure 3 As shown in

[0032] Move the sand and gravel mixed with waste pulp above the sand and gravel separator, and then pour it into the vibrating screen 1. At the same time, the flushing pipe 5 flushes the sand and gravel on the vibrating screen 1. The vibrating screen 1 vibrates the sand and gravel through the flushing pipe 5. The waste pulp and fine sand and gravel pass through the vibrating screen 1 and enter the wastewater collection tank 4. Then, the sand and gravel fall from the discharge end of the vibrating screen 1 into the water throwing mechanism 6. The water throwing mechanism 6 throws off the water on the surface of the sand and gravel. While the water throwing mechanism 6 is rotating, the water throwing mechanism 6 drives the auxiliary drying mechanism 7. The auxiliary drying mechanism 7 blows air on the sand and gravel in the water throwing mechanism 6 to assist the sand and gravel in removing the surface water. Then, the sand and gravel fall from the water throwing mechanism 6 into the collection tank 8, completing the separation of sand and gravel from waste pulp. By allowing the sand and gravel screened by the vibrating screen 1 to enter the water throwing mechanism 6 before entering the collection tank 8, the water throwing mechanism 6 throws off the water on the surface of the sand and gravel. At the same time, the water throwing mechanism 6 drives the auxiliary drying mechanism 7, and the auxiliary drying mechanism 7 blows air on the sand and gravel, so that after the sand and gravel are washed, the moisture on the surface of the sand and gravel entering the collection tank 8 can be reduced, and the subsequent drying time required for the sand and gravel can be shortened.

[0033] Refer to Figure 2 、 Figure 3 and Figure 4, the water throwing mechanism 6 includes a support plate 61 fixed between two support frames 3. A support ring 62 is fixed on the support plate 61. A water throwing support cylinder 63 is arranged on the support ring 62. A water throwing net cylinder 64 is arranged on the water throwing support cylinder 63. A rotating seat 68 is arranged at one end of the water throwing net cylinder 64 away from the water throwing support cylinder 63. The rotating seat 68 abuts against the water throwing net cylinder 64. The rotating seat 68 is rotatably connected to the support seat 9. A water collecting plate 69 is fixed on the water throwing net cylinder 64. An absorbent filler is fixed in the water collecting plate 69. A driving component 65 is arranged between the support ring 62 and the water throwing support cylinder 63. A buffer feeding component 66 is arranged on the support plate 61. A feeding component 67 is arranged between the water throwing support cylinder 63 and the water throwing net cylinder 64.

[0034] The sand and gravel in the vibrating screen 1 fall into the buffer feeding component 66. After the sand and gravel accumulate to an appropriate amount in the buffer feeding component 66, the sand and gravel enter from the buffer feeding component 66 into the water throwing support cylinder 63 and the water throwing net cylinder 64. The support seat 9 is frustum-shaped, allowing the sand and gravel to approach the edge of the water throwing net cylinder 64. Then, the driving component 65 drives the water throwing support cylinder 63 to rotate. The water throwing support cylinder 63 drives the water throwing net cylinder 64, and the water throwing net cylinder 64 drives the support seat 9, causing the sand and gravel to rotate along with it. The water on the surface of the sand and gravel is thrown into the ring formed by the water collecting plate 69. Then, the feeding component 67 drives the water throwing net cylinder 64 to slide on the water throwing support cylinder 63, creating a gap between the water throwing net cylinder 64 and the rotating seat 68. Then, the sand and gravel slide down into the collection pool 8 under the action of the inclined surface of the rotating seat 68. By allowing the sand and gravel to enter the water throwing support cylinder 63 and the water throwing net cylinder 64, and then making the water throwing net cylinder 64 and the water throwing support cylinder 63 rotate to generate centrifugal force, the water on the surface of the sand and gravel can be thrown off, thereby reducing the water on the surface of the sand and gravel after washing and reducing the possibility that the sand and gravel need to be dried for a long time before they can be used again.

[0035] Refer to Figure 2 and Figure 3 , the driving component 65 includes a driving motor 651 fixed on the support plate 61. The output end of the driving motor 651 penetrates through the support plate 61 and is fixed with a driving gear 652. A driving gear ring 653 is rotatably connected to the support ring 62. The driving gear ring 653 meshes with the driving gear 652. The driving gear ring 653 is fixedly connected to the water throwing support cylinder 63. The driving motor 651 on the support plate 61 drives the driving gear 652 to rotate. The driving gear 652 drives the driving gear ring 653 to rotate. The driving gear ring 653 drives the water throwing support cylinder 63 to rotate under the support of the support ring 62. By allowing the driving motor 651 to drive the driving gear ring 653 to rotate and the driving gear ring 653 to drive the water throwing support cylinder 63, the support cylinder can rotate under the support of the support ring 62.

[0036] Refer to Figure 3 and Figure 4, the blanking component 67 includes two sliding blocks 671 symmetrically fixed on the water throwing net cylinder 64. Two symmetrical sliding grooves 672 are formed on the water throwing support cylinder 63. The sliding blocks 671 are located in the sliding grooves 672 and are slidably connected to the water throwing support cylinder 63. Two symmetrical fixing blocks 673 are fixed on the water throwing support cylinder 63. A first hydraulic telescopic rod 674 is fixed on the fixing block 673. The telescopic end of the first hydraulic telescopic rod 674 is fixedly connected to the sliding block 671. After the sand and gravel in the water throwing net cylinder 64 are dehydrated, the first hydraulic telescopic rod 674 on the fixing block 673 drives the sliding block 671, and the sliding block 671 slides in the sliding groove 672. The sliding block 671 drives the water throwing net cylinder 64 to move towards the water throwing support cylinder 63, creating a gap between the water throwing net cylinder 64 and the rotating seat 68, so that the sand and gravel fall into the collection pool 8 through the gap between the water throwing net cylinder 64 and the rotating seat 68. By allowing the water throwing net cylinder 64 to slide in the water throwing support cylinder 63, a gap can be formed between the water throwing net cylinder 64 and the rotating seat 68, facilitating the falling of the sand and gravel from the water throwing net cylinder 64 into the collection pool 8.

[0037] Refer to Figure 3 and Figure 6 , several circumferentially distributed engaging teeth 675 are fixed at one end of the water throwing net cylinder 64 close to the rotating seat 68. Tooth grooves corresponding to the engaging teeth 675 are formed on the rotating seat 68. When the water throwing net cylinder 64 and the rotating seat 68 are in contact with each other, the engaging teeth 675 on the water throwing net cylinder 64 are inserted into the tooth grooves on the rotating seat 68. When the water throwing net cylinder 64 rotates following the water throwing support cylinder 63, the water throwing net cylinder 64 drives the rotating seat 68 to rotate. By inserting the engaging teeth 675 on the water throwing net cylinder 64 into the tooth grooves on the rotating seat 68, it is convenient for the sand and gravel in the water throwing net cylinder 64 to rotate accordingly.

[0038] Refer to Figure 2 and Figure 3, the buffer feeding assembly 66 includes a feeding hopper 661 fixed on the support plate 61. The feeding hopper 661 penetrates through the support plate 61 and corresponds to the water throwing support cylinder 63. A sliding baffle 662 is slidably mounted on the feeding hopper 661. A second hydraulic telescopic rod 663 is arranged between the sliding baffle 662 and the feeding hopper 661. The second hydraulic telescopic rod 663 is fixedly connected to the feeding hopper 661, and the telescopic end of the second hydraulic telescopic rod 663 is fixedly connected to the sliding baffle 662. When the vibrating screen 1 drops the sand and gravel from the discharge end, the sand and gravel directly fall into the feeding hopper 661. After the sand and gravel accumulate, the second hydraulic telescopic rod 663 drives the sliding baffle 662 to slide open from the feeding hopper 661, so that the sand and gravel enter the water throwing support cylinder 63 from the feeding hopper 661. Then, the sand and gravel in the water throwing support cylinder 63 are dewatered. The feeding hopper 661 closes the sliding baffle 662 and continues to receive the sand and gravel falling from the vibrating screen 1. By using the feeding hopper 661 to collect the sand and gravel, the sand and gravel can enter the water throwing support cylinder 63 in batches, so that the sand and gravel can enter the water throwing support cylinder 63 in batches, and at the same time, it does not prevent the vibrating screen 1 from continuing to discharge materials.

[0039] Refer to Figure 2 , Figure 3 and Figure 5 , the auxiliary drying mechanism 7 includes a connecting frame 71 fixed on the support ring 62. A protection cylinder 74 is fixed on the connecting frame 71. A rotating rod 72 is arranged in the protection cylinder 74. One end of the rotating rod 72 is rotatably connected to the connecting frame 71. A plurality of fan plates 73 distributed circumferentially are fixed on the rotating rod 72. A plurality of corresponding air outlet holes and air inlet holes are formed on the protection cylinder 74. A rotating assembly 75 is arranged between the rotating rod 72 and the rotating seat 68. While the rotating seat 68 rotates, the rotating seat 68 drives the rotating assembly 75, the rotating assembly 75 drives the rotating rod 72, and the rotating rod 72 drives the fan plates 73 to rotate under the support of the connecting frame 71. The fan plates 73 accelerate the air flow in the water throwing net cylinder 64 during the rotation of the protection cylinder 74 and fan the sand and gravel being dewatered. By driving the rotating rod 72 while the rotating seat 68 rotates, the fan plates 73 on the rotating rod 72 rotate, so that the air flow in the water throwing net cylinder 64 can be accelerated while the sand and gravel are being dewatered, and further reduce the water attached to the surface of the sand and gravel.

[0040] Refer to Figure 2 , Figure 3 and Figure 5, the rotating assembly 75 includes a rotating gear ring 753 fixed on the rotating base 68. A second rotating gear 752 is meshed with the rotating gear ring 753. The second rotating gear 752 is rotatably connected to the protection cylinder 74. A first rotating gear 751 is fixed on the rotating rod 72. The first rotating gear 751 is meshed with the second rotating gear. While the rotating base 68 rotates, the rotating base 68 drives the rotating gear ring 753. The rotating gear ring 753 drives the second rotating gear 752 on the protection cylinder 74. The second rotating gear 752 drives the first rotating gear 751. The first rotating gear 751 drives the rotating rod 72 to rotate. The rotating rod 72 drives the fan plate 73 to rotate. By enabling the rotating gear ring 753 to drive the rotating rod 72 to rotate under the speed change of the first rotating gear 751 and the second rotating gear 752, it is convenient to make the rotating rod 72 rotate simultaneously while the rotating base 68 rotates, and the rotating rod 72 drives the fan plate 73 to fan air.

[0041] Working principle: Move the sand and gravel mixed with waste slurry above the sand and gravel separator and then pour it into the oscillating screen 1. At the same time, the flushing pipeline 5 flushes the sand and gravel on the oscillating screen 1. The oscillating screen 1 vibrates the sand and gravel through the flushing pipeline 5. The waste slurry and fine sand and gravel pass through the oscillating screen 1 and enter the waste water collection chamber 4. Then the sand and gravel fall into the feed hopper 661 from the discharge end of the oscillating screen 1. After the sand and gravel accumulate, the hydraulic telescopic rod two 663 drives the sliding baffle 662, and the sliding baffle 662 slides away from the feed hopper 661, allowing the sand and gravel to enter the water throwing support cylinder 63 from the feed hopper 661. Then the driving motor 651 on the support plate 61 drives the driving gear 652 to rotate. The driving gear 652 drives the driving gear ring 653 to rotate. The driving gear ring 653 drives the water throwing support cylinder 63 to rotate under the support of the support ring 62. The water throwing support cylinder 63 drives the water throwing mesh cylinder 64, and the water throwing mesh cylinder 64 drives the rotating base 68, causing the sand and gravel to rotate to generate centrifugal force, and the water on the surface of the sand and gravel is thrown into the water collecting plate 69 and absorbed by the water absorbing filler in the water collecting plate 69. Then the hydraulic telescopic rod one 674 on the fixing block 673 drives the sliding block 671, and the sliding block 671 slides in the sliding groove 672. The sliding block 671 drives the water throwing mesh cylinder 64 to move towards the water throwing support cylinder 63, creating a gap between the water throwing mesh cylinder 64 and the rotating base 68, and allowing the sand and gravel to pass through the gap between the water throwing mesh cylinder 64 and the rotating base 68 and fall into the collection pool 8.

[0042] While the rotating base 68 rotates, the rotating base 68 drives the rotating gear ring 753. The rotating gear ring 753 drives the second rotating gear 752 on the protection cylinder 74. The second rotating gear 752 drives the first rotating gear 751. The first rotating gear 751 drives the rotating rod 72 to rotate. The rotating rod 72 drives the fan plate 73 to rotate. The fan plate 73 accelerates the air flow in the water throwing mesh cylinder 64 during the rotation of the protection cylinder 74, and fans the sand and gravel that is being dehydrated, further reducing the water adhering to the surface of the sand and gravel.

Claims

1. A method for recycling wastewater, waste slurry and solid waste of ready-mixed concrete, characterized by: The recycling method is: S1: First, collect the wastewater, waste slurry and solid waste generated during the ready-mixed concrete station test, production and equipment cleaning; S2: The wastewater is then collected into a unified water collection tank for preliminary solid-liquid separation to remove large particle impurities and suspended solids. The pretreated water is sent to the biological treatment system to degrade and remove organic matter through an aerobic bioreactor, so that the water is further purified; S3: Then use membrane technology to further filter the biologically treated water to remove tiny particles and colloids, making the water cleaner and completing wastewater treatment. The treated wastewater can be directly used in the production and testing of ready-mixed concrete; S4: The waste slurry generated by the tank truck cleaning is transferred to the sand and gravel separator by a tank truck, and the waste slurry is directly dumped into the sand and gravel separator. The sand and gravel separator vibrates and screens the fixed materials, and washes the sand and gravel to make the surface of the sand and gravel clean. Then, the water on the surface of the sand and gravel is removed, and the separated recovered slurry is recycled after homogenization, sedimentation, dilution or filter pressing. S5: The recycled slurry and the waste slurry are sent to the homogenization tank for homogenization treatment, and then the mixture of the recycled slurry and the waste slurry is sent to the sedimentation tank. The water above the sedimentation tank is then recycled for wastewater treatment, and the sedimentation slurry below is diluted with mixing water and used for concrete production after passing the inspection; S6: Solid waste such as waste concrete blocks can replace the coarse aggregate required for concrete preparation after crushing, and can also be further crushed to replace fine aggregate to prepare bricklaying mortar or plastering mortar.

2. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 1, characterized in that: The sand and gravel separator comprises two symmetrical support frames (3), an oscillating screen (1) is installed between the two support frames (3), two symmetrical vibration motors (2) are installed on the oscillating screen (1), a wastewater collection chamber (4) is installed between the two support frames (3), the wastewater collection chamber (4) corresponds to the oscillating screen (1), a flushing pipe (5) is installed on the oscillating screen (1), a collection pool (8) is provided at the discharge end of the oscillating screen (1), a support seat (9) is fixed in the collection pool (8), a water throwing mechanism (6) is provided on the support seat (9), and an auxiliary drying mechanism (7) is provided on the support seat (9).

3. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 2, characterized in that: The water-throwing mechanism (6) comprises a support plate (61) fixed between two support frames (3); a support ring (62) is fixed on the support plate (61); a water-throwing support cylinder (63) is arranged on the support ring (62); a water-throwing net cylinder (64) is arranged on the water-throwing support cylinder (63); a rotating seat (68) is arranged at one end of the water-throwing net cylinder (64) away from the water-throwing support cylinder (63); the rotating seat (68) abuts against the water-throwing net cylinder (64); the rotating seat (68) is rotatably connected to the support seat (9); a water collecting plate (69) is fixed on the water-throwing net cylinder (64); a driving assembly (65) is arranged between the support ring (62) and the water-throwing support cylinder (63); a buffer feeding assembly (66) is arranged on the support plate (61); and a feeding assembly (67) is arranged between the water-throwing support cylinder (63) and the water-throwing net cylinder (64).

4. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 3, characterized in that: The driving assembly (65) comprises a driving motor (651) fixed on the support plate (61); the output end of the driving motor (651) passes through the support plate (61) and is fixed with a driving gear (652); a driving ring gear (653) is rotatably connected to the support ring (62); the driving ring gear (653) is meshed with the driving gear (652); and the driving ring gear (653) is fixedly connected to the water-throwing support cylinder (63).

5. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 3, characterized in that: The material discharge assembly (67) comprises two sliding blocks (671) symmetrically fixed on the water-throwing net cylinder (64); the water-throwing support cylinder (63) is provided with two symmetrical sliding grooves (672); the sliding blocks (671) are located in the sliding grooves (672) and are slidably connected to the water-throwing support cylinder (63); the water-throwing support cylinder (63) is fixed with two symmetrical fixed blocks (673); a hydraulic telescopic rod (674) is fixed on the fixed blocks (673); and the telescopic end of the hydraulic telescopic rod (674) is fixedly connected to the sliding block (671).

6. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 5, characterized in that: A plurality of circumferentially distributed engaging teeth (675) are fixed to one end of the water-throwing net cylinder (64) close to the rotating seat (68), and tooth grooves corresponding to the engaging teeth (675) are formed on the rotating seat (68).

7. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 3, characterized in that: The buffer feed assembly (66) comprises a feed hopper (661) fixed on the support plate (61), the feed hopper (661) penetrates the support plate (61) and corresponds to the water-throwing support cylinder (63), a sliding baffle (662) is pressed on the sliding lining of the feed hopper (661), a hydraulic telescopic rod 2 (663) is arranged between the sliding baffle (662) and the feed hopper (661), the hydraulic telescopic rod 2 (663) is fixedly connected to the feed hopper (661), and the telescopic end of the hydraulic telescopic rod 2 (663) is fixedly connected to the sliding baffle (662).

8. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 3, characterized in that: The auxiliary drying mechanism (7) comprises a connecting frame (71) fixed on the supporting ring (62), a protective tube (74) fixed on the connecting frame (71), a rotating rod (72) arranged in the protective tube (74), one end of the rotating rod (72) being rotatably connected to the connecting frame (71), a plurality of circumferentially distributed fan plates (73) being fixed on the rotating rod (72), a plurality of corresponding air outlet holes and air inlet holes being opened on the protective tube (74), and a rotating assembly (75) being arranged between the rotating rod (72) and the rotating seat (68).

9. The method for recycling ready-mixed concrete wastewater, waste slurry and solid waste according to claim 8, characterized in that: The rotating assembly (75) comprises a rotating ring gear (753) fixed on the rotating seat (68), the rotating ring gear (753) being meshingly connected with a rotating gear 2 (752), the rotating gear 2 (752) being rotationally connected to the protective tube (74), and the rotating rod (72) being fixed with a rotating gear 1 (751), the rotating gear 1 (751) being meshingly connected with the rotating gear 2.

Images