Device and method for preparing recycled aggregate based on water jet crushing of waste concrete

Abstract

The present invention discloses a recycled aggregate preparation device based on water jet crushing of waste concrete, comprising a high-pressure water pump, a longitudinal high-pressure water jet pipeline, a transverse high-pressure water jet pipeline, a recycled aggregate collection plate and a recycled aggregate grading mechanism; the outlet of the high-pressure water pump is respectively connected to the longitudinal high-pressure water jet pipeline and the transverse high-pressure water jet pipeline, and the port of the longitudinal high-pressure water jet pipeline is connected with a longitudinal high-pressure nozzle; the waste concrete block is located above the recycled aggregate collection plate, the port of the transverse high-pressure water jet pipeline is connected with a transverse high-pressure nozzle, the transverse high-pressure nozzle is located on one side of the recycled aggregate collection plate, and the recycled aggregate grading mechanism is located below the other side of the recycled aggregate collection plate. The beneficial effects of the present invention are: the present invention can strip aggregates from waste concrete and waste reinforced concrete and perform particle grading, and prepare concrete with different properties according to different levels of recycled aggregate.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a device and method for preparing recycled aggregate based on water jet crushing of waste concrete. Background Art

[0002] Using construction waste to make recycled aggregates, concrete mineral admixtures and other building materials can not only absorb large amounts of construction solid waste, but also meet the construction industry's urgent demand for building material resources. At present, the manufacturing of recycled building materials from construction waste mainly adopts traditional mechanical crushing technologies such as jaw or hammer. This traditional mechanical crushing can further crush abandoned concrete blocks with a particle size of 100-1000mm into recycled aggregates of 1-100mm, and the crushing ratio is generally between 5-10. The aggregate surface has many edges and pores, and the surface is adhered to hardened mortar. In reuse, the physical and chemical properties of recycled aggregates are important parameters affecting the performance of recycled concrete. First, the shape and strength of recycled aggregates will directly affect the mechanical properties of recycled concrete specimens. Traditional mechanical crushing will cause direct damage to the aggregates, seriously affecting their integrity, and at the same time, the micro powder content is high. Secondly, compared with natural stone, the recycled aggregate obtained by traditional mechanical crushing method has high porosity, high water absorption, low apparent density, many surface cracks and low strength, which in turn affects the water-cement ratio and workability of recycled concrete. The low strength of recycled aggregate will also lead to poor mechanical properties of recycled concrete.

[0003] Existing studies have shown that the performance defects of recycled aggregates are mainly attributed to the weak old interface mortar-aggregate transition zone. On the one hand, during the traditional mechanical crushing process, mortar will promote the generation and development of microcracks in concrete; on the other hand, traditional mechanical crushing cannot effectively separate mortar and aggregate, causing mortar to adhere to the surface of aggregate, with rich pores, low strength and weak bonding surface with recycled aggregate. Therefore, recycled aggregates often need to undergo high-temperature mechanical grinding to remove cement mortar adhering to the surface of recycled aggregates. However, high-temperature mechanical grinding of recycled aggregates not only consumes a lot of energy, but also produces a lot of dust, and the recycled aggregates will become rounded due to mechanical grinding, losing their angular advantages. In addition, traditional mechanical crushing technology only considers the waste concrete, but cannot handle the steel bars in it. It is only completed by manual chiseling, resulting in selective waste in resource recycling.

[0004] High-pressure water jet technology is currently mainly used in coal mining, rock breaking and other fields in the field of mining engineering. High-pressure water jet crushing is a new method of material crushing. Its main technical principle is to use high-speed jets to impact solid surfaces to achieve the purpose of material crushing. Existing studies have shown that the highly concentrated energy and pressure pulses generated during the impact of high-pressure water jets can effectively promote the formation of crack networks and induce large-scale overall crushing, which shows obvious technical advantages over traditional crushing methods. In addition, by utilizing the strength difference between different materials, the high-pressure water jet crushing process also has the effect of material separation, achieving technical purposes such as surface rust removal, surface coating removal and surface polishing. At present, research on high-pressure water jet crushing of concrete mainly focuses on cutting mechanism, cross-sectional morphology and other aspects, and does not consider how to grade and utilize the aggregates after stripping, and does not consider whether the characteristics of the recovered aggregates meet the strength requirements of recycled concrete materials, or whether they can be used in new engineering projects. Summary of the invention

[0005] The purpose of the present invention is to provide a simple, environmentally friendly and graded recyclable recycled aggregate preparation device and method based on water jet crushing of waste concrete in view of the deficiencies in the prior art.

[0006] The technical solution adopted by the present invention is: a recycled aggregate preparation device based on water jet crushing of waste concrete, comprising a high-pressure water pump, a longitudinal high-pressure water jet pipeline, a transverse high-pressure water jet pipeline, a recycled aggregate collecting plate and a recycled aggregate grading mechanism; the outlet of the high-pressure water pump is respectively connected to the longitudinal high-pressure water jet pipeline and the transverse high-pressure water jet pipeline, the port of the longitudinal high-pressure water jet pipeline is connected with a longitudinal high-pressure nozzle, the jet direction of the longitudinal high-pressure nozzle is facing the waste concrete block, and the high-pressure water jet is sprayed to the waste concrete block; the waste concrete block is located above the recycled aggregate collecting plate, the port of the transverse high-pressure water jet pipeline is connected with a transverse high-pressure nozzle, the transverse high-pressure nozzle is located on one side of the recycled aggregate collecting plate, and the recycled aggregate grading mechanism is located below the other side of the recycled aggregate collecting plate; the bottom of the transverse jet nozzle is flush with the upper surface of the recycled aggregate collecting plate, and the high-pressure water jet sprayed by the transverse jet nozzle can impact the recycled aggregate on the recycled aggregate collecting plate onto the recycled aggregate grading mechanism.

[0007] According to the above solution, the spraying direction of the transverse high-pressure nozzle is perpendicular to the spraying direction of the longitudinal high-pressure nozzle.

[0008] According to the above scheme, the recycled aggregate grading mechanism includes a recycled aggregate grading plate and a plurality of partitions, wherein the partitions are arranged at intervals along the lateral direction of the recycled aggregate grading plate to divide the recycled aggregate grading plate into different particle size areas.

[0009] According to the above scheme, the partition is perpendicular to the recycled aggregate grading plate.

[0010] According to the above scheme, the recycled aggregate grading plate is placed horizontally on the ground; the recycled aggregate collecting plate, the longitudinal high-pressure water jet pipeline and the transverse high-pressure water jet pipeline are respectively supported by fixed frames, and the upper surface of the recycled aggregate collecting plate is horizontal; the fixed frame is arranged vertically, and the bottom of the fixed frame located at the end of the recycled aggregate collecting plate is connected to one end of the recycled aggregate grading plate.

[0011] According to the above scheme, the recycled aggregate collecting plate, recycled aggregate grading plate and partition are all made of corrosion-resistant materials.

[0012] The present invention also provides a method for preparing recycled aggregate based on water jet crushing of waste concrete, the method comprising the following steps:

[0013] Step 1: Provide and install the recycled aggregate preparation device as described above;

[0014] Step 2: calibrate the recycled aggregate grading mechanism, install partitions on the recycled aggregate grading plate, and divide the recycled aggregate grading plate 5 into different particle size areas;

[0015] Step 3: Open the longitudinal high-pressure water jet pipeline and adjust the water pressure of the pipeline. The longitudinal high-pressure water jet pipeline crushes the waste concrete blocks, and the crushed recycled aggregate falls on the recycled aggregate collection plate;

[0016] Step 4: Open the horizontal high-pressure water jet pipeline, adjust the water pressure of the pipeline, aim the jet water of the horizontal high-pressure water jet pipeline at the surface of the recycled aggregate collection plate, impact the scattered recycled aggregate to different positions on the recycled aggregate grading plate, and judge the particle size range according to the scattered positions of the stones;

[0017] Step 5: Use surface strengthening materials to strengthen the surface of the recycled aggregate to reduce its water absorption rate.

[0018] According to the above scheme, in step 2, the specific calibration method is: place stones of known particle size range on the recycled aggregate collecting plate, take stones of a certain particle size range to open the horizontal high-pressure water jet pipeline, aim at the recycled aggregate collecting plate for horizontal water jet, and slowly scatter the prepared stones at the position of the discarded concrete blocks, adjust the water pressure of the horizontal high-pressure water jet pipeline to ensure that the stones are scattered in the area of ​​the recycled aggregate grading plate corresponding to the particle size range, determine the pressure of the horizontal water jet, and lay the recycled aggregate grading plate on the ground, and separate the area corresponding to the above particle size range with a partition; use the same method to jet the stones of the remaining particle size ranges, determine the areas corresponding to other different particle size ranges, and separate them with partitions.

[0019] The beneficial effects of the present invention are:

[0020] The device of the present invention can not only process waste concrete, but also process waste reinforced concrete, and can strip the aggregates from waste concrete and waste reinforced concrete. The steel bars in waste reinforced concrete can be recycled after stripping; at the same time, the device of the present invention can also classify the separated recycled aggregate, and prepare concrete with different properties according to different levels of recycled aggregate, such as high-performance concrete, and the effective utilization rate of recycled aggregate is high. The particle classification method of the present invention can directly prepare high-quality recycled aggregate from construction waste, and the classification process is dust-free and pollution-free; and the whole process is completed at one time during the hydraulic crushing of construction waste, saving manpower, material and labor. However, the existing aggregate particle classification method will generate large noise during the preparation process, and there will be large dust pollution during the process; if it is necessary to classify the recycled aggregate of construction waste, it is necessary to additionally transport the separated recycled aggregate to the screening site for screening and classification. The present invention uses water flow as the working fluid, and the preparation process is dust-free, environmentally friendly and reliable; the prepared recycled aggregate particles are intact, have low water absorption, and have excellent aggregate quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] In the figure: 1 - high-pressure water pump, 2 - longitudinal high-pressure water jet pipeline, 3 - transverse high-pressure water jet pipeline, 4 - recycled aggregate collecting plate, 5 - recycled aggregate grading plate, 6 - fixed frame, 7 - ground, 8 - partition, 9 - discarded concrete block. DETAILED DESCRIPTION

[0023] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1 A recycled aggregate preparation device based on water jet crushing of waste concrete is shown, comprising a high-pressure water pump 1, a longitudinal high-pressure water jet pipeline 2, a transverse high-pressure water jet pipeline 3, a recycled aggregate collecting plate 4 and a recycled aggregate grading mechanism; the outlet of the high-pressure water pump 1 is connected to the longitudinal high-pressure water jet pipeline 2 and the transverse high-pressure water jet pipeline 3 respectively, the port of the longitudinal high-pressure water jet pipeline 2 is connected with a longitudinal high-pressure nozzle, the jet direction of the longitudinal high-pressure nozzle is facing the waste concrete block 9, and the high-pressure water jet is sprayed to the waste concrete block 9; the waste concrete block 9 is located above the recycled aggregate collecting plate 4, the port of the transverse high-pressure water jet pipeline 3 is connected with a transverse high-pressure nozzle, the transverse high-pressure nozzle is located on one side of the recycled aggregate collecting plate 4, and the recycled aggregate grading mechanism is located below the other side of the recycled aggregate collecting plate 4; the bottom of the transverse jet nozzle is flush with the upper surface of the recycled aggregate collecting plate 4, and the high-pressure water jet sprayed by the transverse jet nozzle can impact the recycled aggregate on the recycled aggregate collecting plate 4 onto the recycled aggregate grading mechanism.

[0025] In the present invention, the longitudinal high-pressure nozzle sprays a high-pressure water jet (pressure is 3~15Mpa) toward the waste concrete block 9, and the waste concrete block 9 is forced to separate the recycled aggregate, and the separated recycled aggregate falls on the recycled aggregate collecting plate 4; the transverse jet nozzle sprays a high-pressure water jet (pressure is 3~15Mpa) in a direction parallel to the recycled aggregate collecting plate 4, and impacts the recycled aggregate on the recycled aggregate collecting plate 4 onto the recycled aggregate grading mechanism.

[0026] In the present invention, the spraying direction of the transverse high-pressure nozzle is perpendicular to the spraying direction of the longitudinal high-pressure nozzle.

[0027] Preferably, the recycled aggregate grading mechanism comprises a recycled aggregate grading plate 5 and a plurality of partitions 8 , wherein the partitions 8 are arranged at intervals in the transverse direction of the recycled aggregate grading plate 5 (ie, the injection direction of the transverse high-pressure nozzle), and the partitions 8 are perpendicular to the recycled aggregate grading plate 5 .

[0028] In this embodiment, the partition 8 divides the recycled aggregate grading plate 5 into different particle size areas. Specifically, the particle size areas from far to near from the recycled aggregate collecting plate 4 are 5mm~10mm, 10mm~16mm, 16mm~20mm, 20mm~25mm, 25mm~31.5mm, and 31.5mm~40mm.

[0029] Preferably, the recycled aggregate grading plate 5 is placed horizontally on the ground 7; the recycled aggregate collecting plate 4, the longitudinal high-pressure water jet pipeline 2 and the transverse high-pressure water jet pipeline 3 are respectively supported by a fixed frame 6, and the upper surface of the recycled aggregate collecting plate 4 is horizontal; the fixed frame 6 is arranged vertically, and the bottom of the fixed frame 6 located at the end of the recycled aggregate collecting plate 4 is connected to one end of the recycled aggregate grading plate 5.

[0030] Preferably, the recycled aggregate collecting plate 4, the recycled aggregate grading plate 5 and the partition plate 8 are all made of corrosion-resistant materials.

[0031] In the present invention, the longitudinal high-pressure water jet pipeline 2 and the transverse high-pressure water jet pipeline 3 can control the water pressure and water flow. The longitudinal high-pressure water jet pipeline 2 is used to crush the waste concrete blocks 9 and separate the recycled aggregates; the water jet direction of the transverse high-pressure water jet pipeline 3 is aimed at the collected recycled aggregates, and the recycled aggregates are impacted to different positions of the recycled aggregate grading plate 5 due to the impact force of the water, and the particle size of the recycled aggregates is determined according to the falling position.

[0032] A method for preparing recycled aggregate based on water jet crushing of waste concrete, the method specifically comprises the following steps:

[0033] Step 1: Provide and install the recycled aggregate preparation device as described above;

[0034] Step 2: calibrate the recycled aggregate grading mechanism. The recycled aggregate grading plate 5 is provided with a partition plate 8 to divide the recycled aggregate grading plate 5 into different particle size areas.

[0035] The specific calibration method is as follows: stones of a known particle size range are placed on the recycled aggregate collecting plate 4, stones of a certain particle size range are taken, the transverse high-pressure water jet pipeline 3 is opened, and the transverse water jet is directed to the recycled aggregate collecting plate 4, and at the same time, the prepared stones of a known particle size are slowly scattered at the position of the discarded concrete block 9, and the water pressure of the transverse high-pressure water jet pipeline 3 is adjusted to ensure that the stones are scattered in the area of ​​the recycled aggregate grading plate 5 corresponding to the particle size range, the pressure of the transverse water jet is determined, and the recycled aggregate grading plate 5 is laid on the ground 7, and the area corresponding to the above-mentioned particle size range is separated by a partition 8; the same method is used to jet the stones of the remaining particle size ranges, and the areas corresponding to other different particle size ranges are determined and separated by a partition 8.

[0036] During calibration, stones with the largest particle size are usually taken first to preliminarily determine the pressure of the horizontal water jet, and this pressure is used as the set pressure; then the pressure and the same method are used to jet stones in other particle size ranges, and the areas of stones in other particle size ranges are determined, and the partitions 8 are installed accordingly; when the boundaries of gravel in adjacent particle size ranges are unclear, the pressure of the horizontal water jet can be adjusted, that is, the set pressure can be appropriately adjusted, and the calibration can be restarted.

[0037] Step 3: Open the longitudinal high-pressure water jet pipeline 2, adjust the water pressure of the pipeline (generally 3-15 MPa), and the longitudinal high-pressure water jet pipeline 2 crushes the waste concrete blocks 9, and the crushed recycled aggregate falls on the recycled aggregate collecting plate 4;

[0038] Step 4, open the horizontal high-pressure water jet pipeline 3, adjust the water pressure of the pipeline to the set water pressure, aim the jet water of the horizontal high-pressure water jet pipeline 3 at the surface of the recycled aggregate collecting plate 4, and impact the scattered recycled aggregate to different positions on the recycled aggregate grading plate 5. The smaller the particle size, the farther the impact distance, and the particle size range is determined according to the position where the stones are scattered.

[0039] Step 5: Use surface strengthening materials to strengthen the surface of the recycled aggregate to reduce its water absorption rate.

[0040] In the present invention, the surface strengthening material can effectively seal the cracks on the surface of the recycled aggregate; the surface strengthening material can be an organic material, such as a polymer, an organic waterproofing agent, etc., or an inorganic material, such as cement slurry, cement mixed with silica fume slurry, etc.

[0041] Example 1

[0042] A method for preparing recycled aggregate based on water jet crushing of waste concrete:

[0043] Step 1: Provide and install the recycled aggregate preparation device as described above;

[0044] Step 2: calibrate the recycled aggregate grading mechanism, the recycled aggregate grading plate 5 and install the partition 8 to divide the recycled aggregate grading plate 5 into different particle size areas.

[0045] Since the type of waste concrete aggregate to be crushed is limestone, limestone is used as the stone for calibrating the instrument. The calibration method is:

[0046] Prepare stones of single particle size grades with particle sizes of 5mm~10mm, 10mm~20mm, 20mm~25mm, 25mm~31.5mm, and 31.5mm~40mm respectively; turn on the horizontal water jet, aim at the surface of the recycled aggregate collecting plate 4, and slowly scatter stones with a particle size of 31.5mm-40mm, adjust the water pressure, ensure that the stones are scattered in the appropriate area corresponding to the recycled aggregate grading plate 5 (close to the front section of the recycled aggregate grading plate 5, that is, close to the recycled aggregate collecting plate 4), separate them with partitions 8, and determine that the water pressure is 6MPa. The stones with particle sizes of 25mm-31.5mm, 20mm-25mm, 10mm-20mm, and 5mm-10mm are impacted in the same way with a water pressure of 10MPa to determine the positions of the stones in each particle size range. If the boundaries of the gravels in adjacent particle size ranges are unclear, the water pressure is adjusted to 7MPa, and the stones with particle sizes of 31.5mm-40mm, 25mm-31.5mm, 20mm-25mm, 10mm-20mm, and 5mm-10mm are impacted in the same way to determine the positions of the particle sizes, and separated by partitions 8, and finally the water pressure of the horizontal high-pressure water jet pipeline 3 is determined to be 7MPa. If the boundaries of the gravels in adjacent particle size ranges are still unclear when the water pressure is adjusted to 7MPa, the water pressure is adjusted again.

[0047] Step 3: Open the longitudinal high-pressure water jet pipeline 2 to crush the waste concrete blocks 9, and adjust the pressure of the water jet to 25 MPa.

[0048] Step 4: Synchronously open the transverse high-pressure water jet pipeline 3 to impact the recovered recycled aggregate to the corresponding particle size area, and finally obtain recycled aggregates with three particle sizes of 5mm~10mm, 10mm~20mm, and 20mm~25mm.

[0049] Step 5: Use surface strengthening materials to strengthen the surface of the recycled aggregate to reduce its water absorption rate.

[0050] The surface strengthening material is prepared by mixing cement and water, and the rheological properties of the surface strengthening material are adjusted by adding a water reducer and a thickener. Then, the recycled coarse aggregate is subjected to a slurry coating operation using a forced mixer. After the slurry coating is completed, the surface-strengthened recycled coarse aggregate (three particle sizes of 5mm~10mm, 10mm~20mm, and 20mm~25mm) is dispersed and placed in a standard curing room. After curing for 3 days, when the surface strengthening material is completely hardened, it is moved into a sealed bag for further curing to save floor space. After the 28-day curing period, the recycled aggregate is dried and bagged for later use.

[0051] The collected recycled aggregate was tested for crushing value, apparent density and water absorption. The test results showed that the apparent density was 2710 kg / m 3 , the water absorption rate is 0.2%.

[0052] Example 2

[0053] A method for preparing recycled aggregate based on water jet crushing of waste concrete:

[0054] Step 1: Provide and install the recycled aggregate preparation device as described above;

[0055] Step 2: calibrate the recycled aggregate grading mechanism, the recycled aggregate grading plate 5 and install the partition 8 to divide the recycled aggregate grading plate 5 into different particle size areas.

[0056] The type of waste concrete aggregate to be crushed is sandstone, so the stone used for calibration of the instrument is sandstone. The specific calibration method is: prepare stones with single particle sizes of 5mm~10mm, 10mm~20mm, 20mm~25mm, 25mm~31.5mm, and 31.5mm~40mm, turn on the lateral water jet, aim at the surface of the recycled aggregate collection plate 4, and slowly sprinkle stones with a particle size of 31.5mm~40mm, adjust the water pressure, ensure that the stones are scattered in the appropriate area corresponding to the recycled aggregate grading plate 5 (knock on the front position close to the recycled aggregate grading plate 5), separate them with partitions 8, and determine the water pressure to be 5MPa. Use the same method to impact the crushed stones corresponding to 25mm-31.5mm; 20mm-25mm; 10mm-20mm; 5mm-10mm with 5MPa water pressure, determine the position of each particle size range, and separate them with partitions 8.

[0057] Step 3: Open the longitudinal high-pressure water jet pipeline 2 to crush the waste concrete blocks 9, and adjust the pressure of the water jet in the longitudinal high-pressure water jet pipeline 2 to 20 MPa.

[0058] Step 4: Synchronously open the transverse high-pressure water jet pipeline 3 to impact the recovered recycled aggregate to the corresponding particle size area, and finally obtain recycled aggregates in three particle size ranges of 5mm~10mm, 10mm~20mm, and 20mm~25mm.

[0059] Step 5: Spray the collected recycled aggregate with an organosilicon waterproofing agent to obtain high-quality recycled aggregate.

[0060] The recycled aggregate was tested for crushing value, apparent density and water absorption. The test results were 11% and the apparent density was 2680kg / m 3 , the water absorption rate is 0.3%.

[0061] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing recycled aggregate based on water jet crushing of waste concrete, characterized in that: The method comprises the following steps: Step 1: Provide and install a recycled aggregate preparation device; Step 2: calibrate the recycled aggregate grading mechanism, install partitions on the recycled aggregate grading plate, and divide the recycled aggregate grading plate into different particle size areas; Step 3: Open the longitudinal high-pressure water jet pipeline and adjust the water pressure of the pipeline. The longitudinal high-pressure water jet pipeline crushes the waste concrete blocks, and the crushed recycled aggregate falls on the recycled aggregate collection plate; Step 4: Open the horizontal high-pressure water jet pipeline, adjust the water pressure of the pipeline, aim the jet water of the horizontal high-pressure water jet pipeline at the surface of the recycled aggregate collection plate, impact the scattered recycled aggregate to different positions on the recycled aggregate grading plate, and judge the particle size range according to the scattered positions of the stones; Step 5: Use surface strengthening materials to perform surface strengthening treatment on the recycled aggregate; The recycled aggregate preparation device comprises a high-pressure water pump, a longitudinal high-pressure water jet pipeline, a transverse high-pressure water jet pipeline, a recycled aggregate collecting plate and a recycled aggregate grading mechanism; the outlet of the high-pressure water pump is respectively connected to the longitudinal high-pressure water jet pipeline and the transverse high-pressure water jet pipeline, the port of the longitudinal high-pressure water jet pipeline is connected to a longitudinal high-pressure nozzle, the jet direction of the longitudinal high-pressure nozzle is facing the waste concrete block, and the high-pressure water jet is sprayed to the waste concrete block; the waste concrete block is located above the recycled aggregate collecting plate, the port of the transverse high-pressure water jet pipeline is connected to a transverse high-pressure nozzle, the transverse high-pressure nozzle is located on one side of the recycled aggregate collecting plate, and the recycled aggregate grading mechanism is located below the other side of the recycled aggregate collecting plate; the bottom of the transverse jet nozzle is flush with the upper surface of the recycled aggregate collecting plate, and the high-pressure water jet sprayed by the transverse jet nozzle impacts the recycled aggregate on the recycled aggregate collecting plate onto the recycled aggregate grading mechanism; The recycled aggregate grading mechanism comprises a recycled aggregate grading plate and a plurality of partitions, wherein the partitions are arranged at intervals along the lateral direction of the recycled aggregate grading plate to divide the recycled aggregate grading plate into different particle size areas.

2. The method for preparing recycled aggregate according to claim 1, characterized in that: In step 2, the specific calibration method is: place stones of known particle size range on the recycled aggregate collecting plate, take stones of a certain particle size range to open the transverse high-pressure water jet pipeline, aim at the recycled aggregate collecting plate for transverse water jet, and slowly scatter the prepared stones at the location of the discarded concrete blocks, adjust the water pressure of the transverse high-pressure water jet pipeline to ensure that the stones are scattered in the area of ​​the recycled aggregate grading plate corresponding to the particle size range, determine the pressure of the transverse water jet, and lay the recycled aggregate grading plate on the ground, and separate the area corresponding to the above particle size range with a partition; use the same method to jet the stones of the remaining particle size ranges, determine the areas corresponding to other different particle size ranges, and separate them with partitions.

3. The method for preparing recycled aggregate according to claim 1, characterized in that: The spraying direction of the transverse high-pressure nozzle is perpendicular to the spraying direction of the longitudinal high-pressure nozzle.

4. The method for preparing recycled aggregate according to claim 1, characterized in that: The partition is perpendicular to the recycled aggregate grading plate.

5. The method for preparing recycled aggregate according to claim 1, characterized in that: The recycled aggregate grading plate is placed horizontally on the ground; the recycled aggregate collecting plate, the longitudinal high-pressure water jet pipeline and the transverse high-pressure water jet pipeline are respectively supported by fixed frames, and the upper surface of the recycled aggregate collecting plate is horizontal; the fixed frame is arranged vertically, and the bottom of the fixed frame located at the end of the recycled aggregate collecting plate is connected to one end of the recycled aggregate grading plate.

6. The method for preparing recycled aggregate according to claim 1, characterized in that: The recycled aggregate collecting plate, recycled aggregate grading plate and partition plate are all made of corrosion-resistant materials.

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