High-precision crushing and screening device for recycled concrete aggregate

Abstract

The utility model relates to the technical field of concrete crushing and screening, in particular to a high-precision crushing and screening device for recycled concrete aggregate. The utility model provides a high-precision crushing device for recycled concrete aggregate. The high-precision crushing device comprises a first screening cavity, a second crushing cavity, a third crushing cavity, a flushing cavity, a draining cavity, a fourth crushing cavity, a first discharge port and a second discharge port, recycled aggregates with five particle sizes can be produced through three times of crushing. The prepared concrete material is high in strength, waste concrete is pre-screened through a strength test, construction waste is pre-screened by using a strength index, the homogeneity of aggregate properties is ensured, and mortar bonded on the surface is removed by using the characteristic that the impact load values borne by the mortar and the aggregate are different. The strength improvement of the recycled aggregate concrete is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete crushing and screening, in particular to a high-precision crushing and screening device for recycled concrete aggregate. Background Technique

[0002] Processing waste concrete into aggregates with different particle sizes generally requires special processing equipment, mainly going through two steps: crushing and screening. The screened recycled aggregates can be directly used for foundation pit backfilling, subgrade water-stable layer filling, etc. in later construction and surrounding construction projects.

[0003] In the existing technology and equipment, there are mainly two technical defects in the crushing and utilization of recycled aggregates: the screening particle size of recycled aggregates is relatively rough; the quality of waste concrete varies greatly, lacking refined classification and grading, resulting in significant differences in the properties of the crushed aggregates.

[0004] In the existing technology for screening waste concrete, its particle size is generally divided into three grades, such as 0 - 5mm, 5 - 15mm, 20 - 31.5mm or 5 - 15mm, 25 - 40mm, 50 - 70mm, etc. According to research, an important prerequisite for producing high-quality concrete materials is to ensure the homogeneous continuity of the average particle size of the aggregates. The continuous graded gravel materials are closely related to the workability, apparent density, compressive strength, and thermal performance of the concrete. When the proportion of coarse aggregates in the concrete aggregate increases, its flexural strength shows a downward trend. The difference in the bulk density between the continuous graded natural aggregates and the non-continuous graded recycled aggregates can reach 80 kg / m 3 . In addition, in the existing instruments and equipment for crushing waste concrete, generally, all waste concrete materials are crushed by means of hammer type, impact type, etc. using a conveyor belt without discrimination, resulting in a huge difference in the quality of the crushed recycled aggregates. For example, there are also strength differences in the crushed aggregates of high-strength concrete and ordinary building waste concrete. The various physical and mechanical properties of the recycled aggregates formed after crushing high-strength waste concrete are better. The existence of these materials with different properties will have a negative impact on the performance of the concrete.

[0005] Therefore, it is necessary to provide a new high-precision crushing and screening device for recycled concrete aggregate to solve the above technical problems. Summary of the Invention

[0006] To solve the above technical problems, the utility model provides a high-precision crushing and screening device for recycled concrete aggregate.

[0007] A high-precision crushing and screening device for recycled concrete aggregate includes:

[0008] The first screening chamber, in which a first screen is fixedly arranged; during use, the largest particle size crushing and screening is carried out in this first screening chamber. According to the required largest particle size of the aggregate in engineering applications, the screen aperture of the first screening chamber is set, and the construction waste is simply crushed and then vibrated and screened.

[0009] The second crushing chamber, the bottom of the first screening chamber is connected to the second crushing chamber through a transmission component. The second crushing chamber is a pressure crushing chamber, and a first screen is fixedly arranged in the second crushing chamber; during use, the waste concrete that has been crushed and screened in the first screening chamber is sent into the second crushing chamber through the transmission component. The second crushing chamber sets the hydraulic value according to the requirements of material properties in engineering applications and in combination with the loss coefficient, and performs press crushing. The crushed waste concrete is vibrated and screened, and the crushed waste concrete is screened out.

[0010] The third crushing chamber, the outer wall above the screen of the second crushing chamber is connected to the third crushing chamber through a transmission component. The third crushing chamber is a counterattack crushing chamber,

[0011] A three-dimensional screen is fixed in the third crushing chamber; during use, the waste concrete that has not passed through the screen in the second crushing chamber is sent into the third crushing chamber through the transmission component. A three-dimensional screen is horizontally arranged in the third crushing chamber, and the crushed waste concrete in the third crushing chamber is vibrated and screened to screen out recycled aggregates with three particle size specifications.

[0012] The flushing chamber, the outer wall of the third crushing chamber is equidistantly connected to the flushing chamber through three transmission components; during use, the three grades of recycled aggregates that have been crushed and screened in the third crushing chamber are sent into the flushing chamber through the transmission component. Three drum-type structural cavities are arranged in the flushing chamber to rotate and clean the three grades of recycled aggregates respectively.

[0013] The draining chamber, the outer wall of the flushing chamber is equidistantly connected to the draining chamber through three transmission components, and a blower is arranged in the draining chamber; during use, the recycled aggregates that have been cleaned in the flushing chamber are sent into the draining chamber through the transmission component. Three cavities are arranged in the draining chamber, and the recycled aggregates are secondarily dust-removed by the blower arranged in the cavity to remove the residual dust.

[0014] The first discharge port, a first discharge port is opened on the outer wall of the draining chamber; during use, the three grades of recycled aggregates with screened particle size specifications can be sent out from the first discharge port.

[0015] Preferably, the outer wall of the draining chamber is connected to a fourth crushing chamber through a transmission component, and a second discharge port is opened on the outer wall of the fourth crushing chamber; during use, if five grades of recycled aggregates are desired, the first two grades of recycled aggregates before the first discharge port can be sent into the fourth crushing chamber for further subdivision to obtain five grades of recycled aggregates and sent out from the second discharge port.

[0016] Preferably, the transmission component is a conveyor belt.

[0017] Preferably, an electro-hydraulic servo system is provided in the second crushing chamber.

[0018] Preferably, the flushing chamber is a vertical cement slurry screening machine, and steel balls are arranged in the flushing chamber; during use, steel balls with different masses and diameters in the flushing chamber are used to knock off the mortar on the surface of the bone particles during the rotation of the drum.

[0019] Preferably, the three-dimensional screen is equidistantly provided with three filter meshes with different pore diameters, and the pore diameters of the filter meshes gradually decrease from top to bottom.

[0020] Preferably, three independent cavities are respectively arranged in the flushing chamber and the draining chamber.

[0021] Preferably, the fourth crushing chamber is the same as the third crushing chamber.

[0022] Compared with the related art, the high-precision crushing device for recycled concrete aggregates provided by the present utility model has the following beneficial effects:

[0023] The aggregates after being crushed and screened by the present utility model can achieve continuous gradation. The present utility model can produce recycled aggregates with five specification particle sizes after three times of crushing and screening, and the concrete material configured with the aggregates with continuous gradation has high strength.

[0024] The waste concrete is pre-screened through strength testing, and the construction waste is pre-screened using strength indicators to ensure the homogeneity of the aggregate properties.

[0025] The bonded mortar on the surface of the crushed aggregates is removed. The application of recycled aggregates is affected by the interfacial bond strength. The present utility model adds a vertical drum structure, and uses the characteristics that the impact load values borne by the mortar and the aggregate are different to remove the surface-bonded mortar, which is beneficial to improving the strength of recycled aggregate concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0027] Figure 2 is a schematic diagram of the structure of the second discharge port of the present utility model;

[0028] Figure 3 is a schematic diagram of the structure of the three-dimensional screen of the present utility model;

[0029] Figure 4 is a schematic diagram of the structure of the first screen of the present utility model.

[0030] Reference numerals in the figures: 1, the first screening chamber; 2, the first screen; 3, the second crushing chamber; 4, the third crushing chamber; 5, the three-dimensional screen; 6, the flushing chamber; 7, the draining chamber; 8, the fourth crushing chamber; 9, the first discharge port; 10, the second discharge port; 11, the conveyor belt. Specific implementation mode

[0031] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] The following elaborates on the specific implementation of the present utility model in detail in conjunction with specific embodiments.

[0033] Please refer to Figures 1 to 4 , a high-precision crushing and screening device for recycled concrete aggregates provided by an embodiment of the present utility model can crush and screen out recycled aggregates with five grades of particle size specifications. The device mainly includes a first screening chamber 1, a second crushing chamber 3, a third crushing chamber 4, a three-dimensional screen 5, a flushing chamber 6, a draining chamber 7, a fourth crushing chamber 8, a first discharge port 9, and a second discharge port 10. The working principle of the high-precision crushing device for recycled concrete aggregates provided by the present utility model is as follows: Waste concrete is first fed into the first screening chamber 1 for maximum particle size crushing and screening according to the aggregate particle size required in engineering applications. A first screen 2 is fixed inside the first screening chamber 1. In practice, the maximum particle size is set to 50 - 70 mm, and the aperture of the first screen 2 is set to 50 - 70 mm. The waste concrete screened by the first screening chamber 1 is sent into the second crushing chamber 3 through the conveyor belt 11.

[0034] The second crushing chamber 3 is a pressure crushing chamber. A first screen 2 is fixed inside the second crushing chamber 3. An electro-hydraulic servo system is installed in the second crushing chamber 3. The hydraulic value is determined according to the performance standards of construction waste or other concrete materials in combination with the loss coefficient. After the parameters are set, the press is used for crushing. At this time, the aperture of the first screen 2 set at the bottom of the chamber is 50 - 70 mm, which is the same as that of the first screening chamber 1. Through the steps of pressure crushing - vibration - screening, the crushed waste concrete is screened out. Under the same pressure value, the crushed concrete has relatively low strength, and the strength screening of recycled aggregates is carried out here.

[0035] The waste concrete that has not been broken or partially broken in the second crushing chamber 3 and cannot pass through a 50 - 70 mm sieve is sent into the third crushing chamber 4 through the conveyor belt 11. The third crushing chamber 4 is a counter - impact crushing chamber. In this chamber, the waste concrete entering the third crushing chamber 4 is crushed into three particle size specifications. The specific setting method of the particle size specifications is as follows: when the maximum particle size is 50 - 70 mm, the three particle size specifications are evenly divided according to 0 - 50 mm. In this embodiment, they are: 0 - 15 mm, 15 - 30 mm, and 30 - 50 mm in sequence. A three - dimensional sieve 5 is arranged at the bottom of the third crushing chamber 4 cavity. The three - dimensional sieve 5 is composed of three filter meshes with different apertures, and the aperture of the filter mesh gradually decreases from top to bottom. Thus, the three - dimensional sieve 5 screens out three grades of recycled aggregates with different particle size specifications in sequence, and the three grades of recycled aggregates screened out are sent into the washing chamber 6 through three conveyor belts 11 respectively.

[0036] There are three independent drum - type structures in the washing chamber 6. A number of steel balls with different masses and diameters are placed in the washing chamber 6. The performance of recycled aggregates is worse than that of natural crushed stones because the surface of recycled aggregates is wrapped with mortar, and this mortar has no strength. By using the rotation of the steel ball drums in the washing chamber 6 to knock off the mortar on the surface of the recycled aggregates, the strength screening and overall improvement of the recycled aggregates are carried out again.

[0037] The recycled aggregates that have passed through the washing chamber 6 are sent to the draining chamber 7 through three conveyor belts 11. During the conveying process, the conveyor belt 11 vibrates to vibrate and sieve off the broken mortar on the recycled aggregates.

[0038] There are three independent cavities in the draining chamber 7, and several blowers are arranged inside the cavities. The three grades of recycled aggregates are respectively sent into the three cavities of the draining chamber 7, and the draining chamber 7 is used for secondary dust removal to remove the residual dust.

[0039] The three grades of recycled aggregates with the finally screened particle size specifications are sent out from the first discharge port 9. If five grades of recycled aggregates are desired, the previous grade of recycled aggregates can be sent into the fourth crushing chamber 8 for further subdivision, and then the five grades of recycled aggregates are sent out from the second discharge port 10.

[0040] The circuits and controls involved in the present utility model are all prior arts and will not be elaborated here.

[0041] The above - mentioned are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present utility model.

Claims

1. A high-precision crushing and screening device for recycled concrete aggregate, characterized in that: include: A first screening cavity, in which a first screen is fixedly disposed; A second crushing chamber, wherein the bottom of the first screening chamber is connected with the second crushing chamber through a transmission assembly, the second crushing chamber is a pressure crushing chamber, and a first screen is fixedly arranged in the second crushing chamber; A third crushing chamber, wherein the outer wall above the screen of the second crushing chamber is connected to the third crushing chamber through a transmission assembly, the third crushing chamber is an impact crushing chamber, and a three-dimensional screen is fixedly arranged in the third crushing chamber; A flushing chamber, wherein the outer wall of the third crushing chamber is equidistantly connected with a flushing chamber through three transmission assemblies; A drain chamber, wherein the outer wall of the flushing chamber is equidistantly connected to the drain chamber through three transmission components, and a blower is arranged in the drain chamber; A first discharge port is provided on the outer wall of the draining chamber.

2. The high-precision crushing and screening device for recycled concrete aggregate according to claim 1 is characterized in that: The outer wall of the draining chamber is connected to the fourth crushing chamber through a transmission component, the outer wall of the fourth crushing chamber is provided with a second discharge port, and the fourth crushing chamber is consistent with the third crushing chamber.

3. The high-precision crushing and screening device for recycled concrete aggregate according to claim 1 or 2, characterized in that: The transmission component is a conveyor belt.

4. The high-precision crushing and screening device for recycled concrete aggregate according to claim 1 is characterized in that: The second crushing chamber is provided with an electronic hydraulic servo system.

5. The high-precision crushing and screening device for recycled concrete aggregate according to claim 1 is characterized in that: The flushing chamber is a vertical cement slurry screening machine, and steel balls are arranged in the flushing chamber.

6. The high-precision crushing and screening device for recycled concrete aggregate according to claim 1 is characterized in that: The three-dimensional screen is equidistantly provided with three filter screens with different apertures, and the apertures of the filter screens gradually decrease from top to bottom.

7. The high-precision crushing and screening device for recycled concrete aggregate according to claim 1 is characterized in that: Three independent cavities are respectively arranged in the flushing cavity and the draining cavity.

Images