Low-energy-consumption construction waste recycled aggregate microwave crushing device

Abstract

The utility model discloses a low-energy-consumption construction waste recycled aggregate microwave crushing device which comprises a rack, and a conveying belt is horizontally erected on the rack; the discharging hopper is arranged at the feeding end of the conveying belt, and a discharging opening is formed in the bottom of the discharging hopper; the first spraying bin is arranged on the conveying belt behind the discharging hopper, and a first atomizing nozzle is arranged on the bin wall of the first spraying bin; the second spraying bin is arranged at the discharging end of the conveying belt, and a second atomizing nozzle is arranged on the bin wall of the second spraying bin; the microwave heating part is composed of a resonant cavity arranged between the first spraying bin and the second spraying bin and a microwave generator connected to the resonant cavity through a microwave tube, the front end of the resonant cavity is connected with the first spraying bin, and the rear end of the resonant cavity is connected with the second spraying bin. The device has the advantages that under the action of temperature stress, cracking and disintegration of mortar on the surface of the aggregate are easily completed under the condition that the internal aggregate is not damaged, the stripping rate of old mortar on the surface of the aggregate is improved, the integrity of the angularity of the internal aggregate is ensured, and high-quality regeneration of the aggregate is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of construction waste recycling, in particular to a low-energy consumption construction waste recycled aggregate microwave crushing device. Background Art

[0002] Recycled aggregate from construction waste is a material with similar properties to natural aggregate obtained by crushing old concrete with steel bars removed by a jaw crusher. Compared with natural aggregate, it has more edges and corners, old cement mortar remains on the surface, and is not a uniform single body. Therefore, when used as a building material, the main problem is the low bonding strength between the remaining old cement mortar and the new cement mortar, and the high porosity and water absorption of the old cement mortar. The recycled concrete prepared with it is prone to form more weak interfaces inside, and the more residual mortar, the more weak interfaces there are. Weak interfaces not only increase the risk of chloride ions entering the concrete, but also have a negative impact on the mechanical properties and durability of the concrete, thereby affecting the overall performance of the recycled concrete, making the performance of the recycled concrete inferior to that of natural aggregate concrete, greatly limiting the widespread application of recycled aggregate.

[0003] The simplest and most commonly used method for processing recycled aggregates is mechanical processing, which is to crush and remove the mortar remaining on the surface of the aggregate through mechanical external force. However, the collision and friction process during mechanical processing of recycled aggregates will damage its performance, and then introduce microcracks in the aggregate, resulting in unsatisfactory performance of the subsequently prepared recycled concrete, and high-quality recycling of construction waste aggregates cannot be achieved. Summary of the invention

[0004] The utility model aims to provide a low-energy consumption microwave crushing device for recycled aggregate of construction waste in view of the defects of the prior art.

[0005] In order to achieve the above purpose, the utility model can adopt the following technical solutions:

[0006] The low-energy consumption construction waste recycled aggregate microwave crushing device described in the utility model comprises:

[0007] A frame, on which a conveyor belt is horizontally mounted;

[0008] A lower hopper is arranged at the feeding end of the conveyor belt, and the bottom of the lower hopper has a drop opening directly above the belt body of the conveyor belt;

[0009] A first spray bin is arranged on the conveyor belt behind the lower hopper, and a first atomizing nozzle for spraying into the bin is provided on the bin wall of the first spray bin;

[0010] A second spray bin is arranged at the discharge end of the conveyor belt, and a second atomizing nozzle for spraying into the bin is provided on the bin wall of the second spray bin;

[0011] The microwave heating part is composed of a resonant cavity arranged between the first spray chamber and the second spray chamber, and a microwave generator connected to the resonant cavity through a microwave tube, wherein the front end of the resonant cavity is connected to the first spray chamber, and the rear end of the resonant cavity is connected to the second spray chamber.

[0012] Furthermore, the lower hopper is a four-sided pyramid hopper that is larger at the top and smaller at the bottom. At this time, a baffle plate that slides up and down is arranged on the wall of the lower hopper close to the first spray bin. By sliding the baffle plate downward, the dropping speed of the material at the bottom of the lower hopper is reduced, and the lower edge of the baffle plate can be used to scrape the aggregate falling on the conveyor belt, thereby adjusting the stacking thickness of the aggregate.

[0013] Furthermore, the first atomizing nozzles are in three groups, which are respectively arranged on the top wall and left and right side walls of the first spray bin, and the second atomizing nozzles are in one group arranged on the top wall of the second spray bin.

[0014] The advantage of the utility model lies in that by arranging a conveyor belt on the frame, in conjunction with the lower hopper, the first spray bin, the second spray bin and the microwave heating part which are arranged in sequence along the conveying direction of the conveyor belt, the surface of the construction waste aggregate can be sprayed and humidified, microwave heated and cooled and humidified, thereby utilizing the temperature stress effect to easily complete the cracking and disintegration of the mortar on the surface of the aggregate without destroying the internal aggregate, thereby improving the stripping rate of the old mortar on the surface of the aggregate, ensuring that the angularity of the internal aggregate is intact, and realizing high-quality regeneration of the aggregate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0020] like Figure 1 As shown, the low-energy consumption construction waste recycled aggregate microwave crushing device described in the utility model includes a frame 1 for horizontal support and convenient overall movement, and a conveyor belt 2 for conveying construction waste aggregate is horizontally arranged on the frame 1. The belt body of the conveyor belt 2 should adopt a high-temperature resistant belt body, which can normally complete the conveying work under the conditions that the aggregate temperature does not exceed 800°C and the belt surface temperature does not exceed 220°C.

[0021] The feed end of the conveyor belt 2 is provided with a lower hopper 3 installed on the frame 1. The bottom of the lower hopper 3 has a drop opening 4. The drop opening 4 is directly above the feed end of the conveyor belt 2 and has a certain gap between it and the belt body of the conveyor belt 2 to ensure that the aggregate can fall on the belt body and be transported to the discharge end. Furthermore, in order to facilitate the adjustment of the material dropping speed of the lower hopper 3 and the thickness of the aggregate on the conveyor belt 2, the lower hopper 3 can be specifically a four-sided pyramid hopper with a larger upper part and a smaller lower part, and a baffle plate 5 that slides up and down along its inclined direction is arranged on one of the side walls of the lower hopper 3. The baffle plate 5 is located near the discharge end of the conveyor belt 2. At this time, by sliding the baffle plate 5 downward, a part of the material dropping port 4 at the bottom of the lower hopper 3 can be blocked, thereby reducing the material dropping speed of the material dropping port 4. At the same time, the lower edge of the baffle plate 5 can be used to scrape the aggregate falling on the conveyor belt 2, thereby adjusting the accumulation thickness of the aggregate, so as to achieve the purpose of increasing the accumulation thickness of the aggregate on the conveyor belt 2 when the baffle plate 5 slides up, and reducing the accumulation thickness of the aggregate on the conveyor belt 2 when the baffle plate 5 slides down.

[0022] A first spray bin 6 mounted on the frame 1 is connected to the rear of the lower hopper 3. The first spray bin 6 is covered on the conveyor belt 2. A first atomizing nozzle 7 for spraying into the bin is provided on the bin wall. The first atomizing nozzle 7 is divided into three groups, which are respectively arranged at the center of the top wall and the center of the left and right side walls of the first spray bin 6. The first atomizing nozzle 7 is connected to an external water supply pipe to spray water on the surface of the aggregate in the first spray bin 6 in the form of water mist.

[0023] The discharge end of the conveyor belt 2 is provided with a second spray bin 8 installed on the frame 1. The second spray bin 8 is covered on the conveyor belt 2, and has a second atomizing nozzle 9 on its bin wall for spraying into the bin. The second atomizing nozzle 9 is a group and is arranged at the center of the top wall of the second spray bin 8. The second atomizing nozzle 9 is connected to an external water supply pipe through the second atomizing nozzle 9, and then water is sprayed on the surface of the aggregate in the second spray bin 6 in the form of water mist.

[0024] In addition, a microwave heating unit for heating aggregate is also provided on the frame 1, and the microwave heating unit is composed of a resonant cavity 10 set between the first spray chamber 6 and the second spray chamber 8, and a microwave generator 12 connected to the resonant cavity 10 through a microwave tube 11. The resonant cavity 10 is a metal cavity for making a high-frequency electromagnetic field continuously oscillate therein, and is covered on the conveyor belt 2. The front end of the resonant cavity 10 is connected to the first spray chamber 6, and the rear end thereof is connected to the second spray chamber 8; the microwave generator 12 adopts a high-power adjustable frequency microwave generator with switchable output frequencies of 915MHz and 2450MHz and a microwave power range of 10-100kW, and can adjust the output frequency and microwave power according to the aggregate particle size and the disintegration of the mortar on the aggregate surface. If the aggregate particles are large, the frequency of 915MHz is selected to achieve deep cracking of large aggregates, and if the aggregate particles are small, the frequency of 2450MHz is selected to achieve surface excitation of fine aggregates. In addition, multiple microwave generators 12 can be connected to the resonance cavity 10 according to actual conditions, so as to improve the crushing and disintegration efficiency of old mortar on the aggregate surface.

[0025] When in use, just pour the construction waste aggregates that need to be recycled into the lower hopper 3. The aggregates fall through the drop port 4 at the bottom of the lower hopper 3 to the feeding end of the conveyor belt 2, and are then driven by the conveyor belt 2 to pass through the first spray bin 6, the resonance cavity 10 and the second spray bin 8 in sequence.

[0026] When the aggregate enters the first spray bin 6, the first atomizing nozzle 7 on the bin wall of the first spray bin 6 will spray water mist to wet the surface of the aggregate, thereby increasing the moisture content of the old mortar adhered to the surface of the aggregate; then the aggregate with the wet surface will enter the resonance cavity 10, and microwave heating will be performed in the resonance cavity 10 to crush and disintegrate the old mortar on the surface of the aggregate, thereby completing the stripping operation of the old mortar on the surface of the aggregate. Compared with general mechanical crushing and regeneration of aggregate, the stripping rate of the old mortar on the surface of the aggregate can be improved, and the angularity of the internal aggregate is guaranteed to be intact; the aggregate stripped by the microwave heating part enters the second spray bin 8 again, so that the heated aggregate is sprayed with water mist again. At this time, the aggregate is affected by the low-temperature water mist, and temperature stress is formed inside and outside, thereby reducing the interface strength between the aggregate and the mortar, further realizing mortar crushing and realizing high-quality regeneration of the aggregate. At the same time, the aggregate sprayed with the second atomizing nozzle 9 can also greatly reduce the dust phenomenon in the subsequent mechanical screening process.

Claims

1. A low-energy consumption construction waste recycled aggregate microwave crushing device, characterized by: include A frame, on which a conveyor belt is horizontally mounted; A lower hopper is arranged at the feeding end of the conveyor belt, and the bottom of the lower hopper has a drop opening directly above the belt body of the conveyor belt; A first spray bin is arranged on the conveyor belt behind the lower hopper, and a first atomizing nozzle for spraying into the bin is provided on the bin wall of the first spray bin; A second spray bin is arranged at the discharge end of the conveyor belt, and a second atomizing nozzle for spraying into the bin is provided on the bin wall of the second spray bin; The microwave heating part is composed of a resonant cavity arranged between the first spray chamber and the second spray chamber, and a microwave generator connected to the resonant cavity through a microwave tube, wherein the front end of the resonant cavity is connected to the first spray chamber, and the rear end of the resonant cavity is connected to the second spray chamber.

2. The low-energy consumption construction waste recycled aggregate microwave crushing device according to claim 1 is characterized by: The lower hopper is a four-sided pyramid hopper that is larger at the top and smaller at the bottom. A baffle plate that slides up and down is arranged on the wall of the lower hopper close to the first spray bin.

3. The low-energy consumption construction waste recycled aggregate microwave crushing device according to claim 1 is characterized by: The first atomizing nozzles are in three groups, which are respectively arranged on the top wall and the left and right side walls of the first spray bin, and the second atomizing nozzles are in one group arranged on the top wall of the second spray bin.

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