Concrete waste recovery device for building construction

Abstract

The invention relates to the technical field of building material recovery, and discloses a concrete waste recovery device for building construction, which comprises a first conveying mechanism, a primary crushing mechanism, a second conveying mechanism, a reinforcing steel bar extraction mechanism and a multi-stage crushing mechanism, the primary crushing mechanism is used for primarily crushing concrete waste into concrete fragments and reinforcing steel bars so that the concrete fragments can be separated from the internal reinforcing steel bars, the second conveying mechanism is used for conveying the concrete fragments and the reinforcing steel bars, and the reinforcing steel bar extracting mechanism is used for extracting the separated reinforcing steel bars so that the reinforcing steel bars in the concrete fragments can be recycled. And the multi-stage crushing mechanism is used for performing multi-stage crushing on the concrete fragments, so that the recycled concrete meets the use requirements. Conveying, crushing and extracting are all completed mechanically, manual intervention is reduced, the treatment efficiency is improved, efficient recycling of the concrete waste is achieved, and the concrete waste recycling device has important significance in promoting green buildings and circular economy.

Description

Technical Field

[0001] The present invention relates to the technical field of building material recycling, in particular to a concrete waste recycling device for building construction. Background Art

[0002] During the construction process, a large amount of concrete waste is generated. Most of the concrete waste is transported to the suburbs or around the city for simple landfill or open-air storage without any treatment. This not only wastes land and resources, but also pollutes the environment. The production and utilization of concrete waste is of great significance to saving resources and protecting the environment.

[0003] At present, reinforced concrete blocks are generally crushed once and then separated and recycled with the help of other equipment. However, the transportation process increases the labor intensity of the staff, the operation is not convenient, and there may be large-volume uncrushed waste. It is also necessary to screen out larger-sized concrete fragments for secondary crushing, which reduces the work efficiency. Summary of the Invention

[0004] The present application discloses a concrete waste recycling device for construction, which aims to solve the problems of inconvenient separation and recycling and incomplete one-time crushing in the prior art.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions: A concrete waste recycling device for construction, comprising: A first conveying mechanism, the first conveying mechanism is used to convey concrete waste; A primary crushing mechanism is provided corresponding to the first conveying mechanism and is used for preliminarily crushing the concrete waste into concrete fragments and steel bars, so as to separate the concrete fragments from the internal steel bars; A second conveying mechanism, the second conveying mechanism is located below the discharge end of the first conveying mechanism, and the second conveying mechanism is used to convey concrete fragments and steel bars; The steel bar extraction mechanism is provided corresponding to the second conveying mechanism and is used to extract the separated steel bars so as to recover the steel bars in the concrete fragments; The multi-stage crushing mechanism is located below the discharge end of the second conveying mechanism. The multi-stage crushing mechanism is used to perform multi-stage crushing on concrete fragments so that the recovered concrete meets the use requirements.

[0006] The technical solution adopted by the present invention can achieve the following beneficial effects: The present invention, through the coordination of a primary crushing mechanism and a rebar extraction mechanism, can completely separate rebar from concrete waste, achieving a recovery rate of over 90%, reducing metal resource waste. The multi-stage crushing mechanism performs multi-stage crushing of concrete fragments until the particle size meets the standards for recycled aggregate. The multi-stage crushed concrete fragments can be used as recycled aggregate for new concrete preparation, road base, and other applications, thus achieving waste recycling. The present invention achieves refined waste processing through a modular design of "primary crushing-rebar extraction-multi-stage crushing." Compared to traditional single crushing equipment, resource utilization is increased by approximately 40%. Furthermore, transportation, crushing, and extraction are all performed mechanically, reducing manual intervention, improving processing efficiency, and facilitating operation. This reduces the labor intensity of workers and achieves efficient resource utilization of concrete waste, which is of great significance for promoting green buildings and a circular economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0008] Figure 1 is a schematic diagram of a front cross-sectional structure disclosed in some embodiments of the present application; Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at A in the middle; Figure 3 yes Figure 1 Schematic diagram of the enlarged structure at B in the middle; Figure 4 yes Figure 1 Schematic diagram of the enlarged structure at C in the middle; Figure 5 yes Figure 1 Schematic diagram of the enlarged structure at D in the middle; Figure 6 is a left-side structural schematic diagram of the primary crushing mechanism disclosed in some embodiments of the present application; Figure 7 It is a schematic structural diagram of the crushing and grinding head disclosed in some embodiments of the present application.

[0009] In the picture: 100-first conveying mechanism; 200 - primary crushing mechanism; 210 - driving member; 211 - first rotating shaft; 212 - second rotating shaft; 220 - eccentric assembly; 221 - rotating disc; 222 - connecting rod; 223 - lifting column; 224 - connecting plate; 225 - eccentric shaft; 226 - stopper; 230 - elastic assembly; 231 - guide rod; 232 - limit block; 233 - elastic member; 240 - crushing head; 300- second conveying mechanism; 400 - steel bar extraction mechanism; 410 - ring guide rail conveyor line; 411 - sliding seat; 420 - telescopic member; 430 - electromagnet; 440 - mounting plate; 500 - Multi-stage crushing mechanism; 510 - Crushing trough; 511 - First inclined portion; 512 - First vertical portion; 513 - Concave portion; 514 - Feeding port; 520 - Crushing and grinding head; 521 - Second inclined portion; 522 - Second vertical portion; 523 - Convex portion; 530 - Crankshaft assembly; 531 - Third rotating shaft; 532 - Crank rod; 533 - Fourth rotating shaft; 540 - Crushing teeth; 550 - Collecting hopper; 600- linkage assembly; 610- first bevel gear; 620- second bevel gear; 700-buffer assembly; 710-buffer guide plate; 720-fixing plate; 730-shock absorber; 10-box; 20-feed hopper; 30-rebar discharge port; 40-concrete discharge port; 50-guide plate; 60-baffle; 70-support plate. DETAILED DESCRIPTION

[0010] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0011] The terms "first", "second", "third", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", "third", etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0012] The inventive concept of this application is described here: During actual use, the inventor found that concrete waste contains discarded steel bars and concrete blocks. When recycling concrete waste, the reinforced concrete blocks will be crushed, and the steel bars inside the crushed reinforced concrete blocks will be mixed with the concrete fragments. Since the steel bars and concrete fragments have different functions during recycling, other equipment is needed to distinguish and recycle them (the current commonly used distinction method is to separate the steel bars and concrete fragments through a conveyor belt magnetic screening method, so as to distinguish and recycle the steel bars and concrete fragments). The operation is not convenient, and the process of mid-transfer increases the labor intensity of the staff. Moreover, the reinforced concrete blocks are generally classified after a crushing operation. There may still be some large-volume waste that has not been crushed, and it is necessary to screen out concrete fragments with larger particle sizes for secondary crushing, which has low work efficiency.

[0013] Based on this, the inventor provides a concrete waste recycling device for construction to solve the problem that traditional single crushing equipment cannot perform secondary crushing, and the steel bars and concrete fragments need to be transported to other equipment for separate recycling, which is not convenient to operate.

[0014] The following is combined with Figures 1 to 7 , a concrete waste recycling device for construction provided by this application is described in detail through specific embodiments and application scenarios.

[0015] Reference Figure 1 , a concrete waste recycling device for construction, comprising: a first conveying mechanism 100, a primary crushing mechanism 200, a second conveying mechanism 300, a steel bar extraction mechanism 400 and a multi-stage crushing mechanism 500; Specifically, refer to Figure 1The concrete waste recycling device includes a box body 10, a first conveying mechanism 100, a primary crushing mechanism 200, a second conveying mechanism 300, a steel bar extraction mechanism 400 and a multi-stage crushing mechanism 500 are all arranged in the box body 10; a feed hopper 20 is installed on one side of the top of the box body 10, and the feed hopper 20 is located directly above the feed end of the first conveying mechanism 100; the primary crushing mechanism 200 is located directly above between the feed end and the discharge end of the first conveying mechanism 100; a guide plate 50 is obliquely arranged directly below the discharge end of the first conveying mechanism 100, and the concrete fragments and steel bars are guided and transported to the feed end of the second conveying mechanism 300 through the guide plate 50; a steel bar discharge port that cooperates with the steel bar extraction mechanism 400 is opened on one side of the box body 10 A concrete discharge port 30 is provided on one side of the box body 10, and the concrete discharge port 40 that cooperates with the multi-stage crushing mechanism 500 is opened; baffles 60 are installed on both sides of the width direction of the first conveying mechanism 100, the guide plate 50 and the second conveying mechanism 300 to prevent concrete waste from splashing during the conveying and primary crushing process and scattering in the box body 10, thereby reducing the recycling efficiency; dust suction pipes (not shown in the figure) can be set at the feed hopper 20, the crushing place of the primary crushing mechanism 200, and the crushing place of the multi-stage crushing mechanism 500 in the box body 10. The dust suction pipe can be connected to an external dust collector (not shown in the figure) to process the dust generated during the crushing in the box body 10, so as to prevent the dust from flying out of the box body 10, affecting the health of the staff and polluting the environment.

[0016] Reference Figure 1 , the first conveying mechanism 100 is used to convey concrete waste; Specifically, the first conveying mechanism 100 can be a stainless steel conveyor to ensure the impact resistance of the first conveying mechanism 100 and ensure that the primary crushing mechanism 200 and the first conveying mechanism 100 are well-matched. The specific structure and operating principle of the first conveying mechanism 100 are common knowledge and are not described in detail here. The first conveying mechanism 100 can be configured as a commercially available product. Of course, those skilled in the art can also make routine improvements based on existing products. A support plate 70 is installed between the top and bottom of the stainless steel conveyor belt of the first conveying mechanism 100 within the housing 10 to further improve the impact resistance of the first conveying mechanism 100 and ensure that the primary crushing mechanism 200 and the first conveying mechanism 100 are well-matched.

[0017] Reference Figure 1 The primary crushing mechanism 200 is provided corresponding to the first conveying mechanism 100. The primary crushing mechanism 200 is used to initially crush the concrete waste into concrete fragments and steel bars, so as to separate the concrete fragments from the internal steel bars, thereby facilitating the subsequent extraction of the steel bars. The second conveying mechanism 300 is located below the discharge end of the first conveying mechanism 100 and is used to convey concrete fragments and steel bars; Specifically, the second conveying mechanism 300 can be a rubber conveyor or a nylon conveyor to ensure the second conveying mechanism 300's impact resistance and wear resistance, and to ensure that the second conveying mechanism 300 cooperates well with the rebar extraction mechanism 400, so that the rebar extraction mechanism 400 does not generate magnetic attraction with the rubber conveyor belt or the nylon conveyor belt when extracting rebar. The specific structure and operating principle of the second conveying mechanism 300 are common knowledge and are not described in detail here. The second conveying mechanism 300 can be configured as a commercially available product. Of course, those skilled in the art can also make routine improvements based on existing products.

[0018] Reference Figure 1 The steel bar extraction mechanism 400 is provided corresponding to the second conveying mechanism 300, and the steel bar extraction mechanism 400 is used to extract the separated steel bars so as to recycle the steel bars in the concrete fragments; Specifically, the steel bar extraction mechanism 400 separates and recovers the steel bars in the concrete fragments by magnetic attraction. The magnetic strength can be adjusted according to the size of the steel bars, and the metal detection sensor (not shown) is used for precise positioning to ensure the steel bar extraction rate.

[0019] Reference Figure 1 The multi-stage crushing mechanism 500 is located below the discharge end of the second conveying mechanism 300. The multi-stage crushing mechanism 500 is used to perform multi-stage crushing on concrete fragments so that the recycled concrete meets the use requirements.

[0020] Specifically, the multi-stage crushing mechanism 500 can be used in conjunction with a screening device (not shown) to achieve particle size classification to meet different engineering requirements (such as roadbed filler, recycled concrete, etc.), that is, the concrete fragments after multi-stage crushing are graded and screened through a screening device to achieve the recycling of concrete.

[0021] This device, combined with an intelligent control system (such as PLC programming), can further optimize the crushing force and conveying speed and realize intelligent adjustment of energy consumption. The modular design of "primary crushing-rebar extraction-multi-stage crushing" realizes the refined treatment of waste. Compared with traditional single crushing equipment, the resource utilization rate is improved by about 40%. In addition, transportation, crushing and extraction are all completed by machinery, which reduces manual intervention, improves processing efficiency, is easy to operate, reduces the labor intensity of staff, and realizes the efficient resource utilization of concrete waste, which is of great significance to promoting green buildings and circular economy.

[0022] Among them, reference Figure 1 and Figure 5In this embodiment, the concrete waste recycling device also includes a buffer assembly 700, which is located above the feed end of the first conveying mechanism 100. The buffer assembly 700 is used to buffer the concrete waste falling onto the first conveying mechanism 100 to reduce the impact force generated by the concrete waste falling onto the first conveying mechanism 100.

[0023] Specifically, the buffer assembly 700 includes a buffer guide plate 710, a fixed plate 720 and a shock absorber 730. The buffer guide plate 710 is located on the side of the feed hopper 20 away from the primary crushing mechanism 200, and the buffer guide plate 710 is rotatably installed on the top of the box body 10. The buffer guide plate 710 is tilted and located directly below the feed hopper 20. The surface of the buffer guide plate 710 can be provided with corrugations or protrusions to disperse the impact force; the fixed plate 720 is vertically installed on the top of the box body 10 and is located On one side of the buffer guide plate 710, one end of the shock absorber 730 is rotatably mounted on the fixed plate 720, and the other end of the shock absorber 730 is rotatably connected to the side of the buffer guide plate 710 away from the feed hopper 20. By providing the shock absorber 730 to provide buffering force and absorb energy, the impact of concrete waste on the first conveying mechanism 100 is reduced, the equipment life and operation stability are improved, and the operation and maintenance costs are reduced; among them, the specific structure and working principle of the shock absorber 730 are common knowledge, so they are not described in detail here.

[0024] Reference Figure 1 、 Figure 2 and Figure 6 In this embodiment, the primary crushing mechanism 200 includes a driving member 210, an eccentric assembly 220, an elastic assembly 230 and a crushing head 240; The output end of the driving member 210 is connected to an eccentric assembly 220, the eccentric assembly 220 is connected to an elastic assembly 230, the elastic assembly 230 is connected to a crushing head 240, and the crushing head 240 is located directly above the first conveying mechanism 100; Specifically, the driving member 210 is installed on the top of the box body 10. The driving member 210 is usually a motor. In this embodiment, the driving member 210 is a dual-axis motor, one end of which is connected to the first rotating shaft 211, and the other end is connected to the second rotating shaft 212; the elastic component 230 and the crushing head 240 are located in the box body 10, and the crushing head 240 is located directly above between the feed end and the discharge end of the first conveying mechanism 100.

[0025] Among them, reference Figure 2 and Figure 6 The eccentric assembly 220 is used to drive the crushing head 240 to move up and down reciprocatingly, so that the crushing head 240 can perform preliminary crushing on the concrete waste; Specifically, the eccentric assembly 220 converts the rotational motion of the driving member 210 into a reciprocating lifting movement of the crushing head 240, so that the crushing head 240 performs periodic impact motion in the vertical direction. The high-frequency impact can more effectively separate the concrete block from the internal steel bars, so that the steel bar and concrete separation rate reaches more than 90%. Compared with the extrusion crusher of the traditional jaw crusher, the crushing efficiency is increased by about 30%, and the excessive bending or breaking of the steel bars is reduced, which is convenient for subsequent extraction and retains the mechanical properties of the steel bars. The recovered steel bars can be directly used for processing small components or returned to the furnace for smelting, which has higher added value.

[0026] Reference Figure 2 and Figure 6 The elastic component 230 is used for buffering and shock absorption to improve the stability of the impact crushing of the crushing head 240.

[0027] Specifically, when the crushing head 240 impacts the concrete waste, the elastic component 230 absorbs the impact force through compression deformation, reducing the vibration amplitude of the equipment; during the return stroke, the elastic restoring force assists the crushing head 240 to reset, reducing damage caused by empty hitting; the elastic deformation of the elastic component 230 reduces the vibration transmission of the crushing head 240 to the first conveying mechanism 100, reducing noise pollution; when encountering super-hard materials (such as mixed metal blocks), the flexibility of the elastic component 230 allows the crushing head 240 to temporarily avoid, preventing the driving part 210 from being overloaded, burned or damaged; the buffering effect of the elastic component 230 reduces the rebound vibration of the crushing head 240, ensuring the accuracy of the force and position of each impact, and improving the uniformity of crushing.

[0028] Reference Figure 2 and Figure 6 In this embodiment, the eccentric assembly 220 includes a rotary disc 221, a connecting rod 222, a lifting column 223 and a connecting plate 224; The turntable 221 is connected to the output end of the driving member 210. One end of the connecting rod 222 is eccentrically connected to the turntable 221. The other end of the connecting rod 222 is rotatably connected to the lifting column 223. A connecting plate 224 is installed at the bottom of the lifting column 223, and the connecting plate 224 is connected to the elastic component 230.

[0029] Specifically, the turntable 221 is connected to the first rotating shaft 211 of the driving member 210; the driving member 210 is arranged horizontally, and the turntable 221 is arranged vertically; the other end of the connecting rod 222 is hinged to the top of the lifting column 223, and the lifting column 223 is arranged vertically, passing through the top of the box body 10 and extending to the inside of the box body 10. A guide sleeve can be provided on the box body 10, and the lifting column 223 is slidably arranged in the guide sleeve; the connecting plate 224 is located inside the box body 10.

[0030] An eccentric shaft 225 is eccentrically provided on one side of the turntable 221 away from the first rotating shaft 211. The eccentric shaft 225 is hinged to one end of the connecting rod 222. A stopper 226 is installed on the end of the eccentric shaft 225 away from the turntable 221 to prevent the connecting rod 222 from separating from the eccentric shaft 225.

[0031] The circular motion of the turntable 221 is converted into vertical motion of the lifting column 223 through the connecting rod 222; the impact load is converted into axial pressure through the hinge design to avoid bending stress concentration.

[0032] Reference Figure 2 and Figure 6 In this embodiment, the elastic component 230 includes a guide rod 231, a limit block 232 and an elastic member 233; The guide rod 231 vertically passes through the connecting plate 224 , the bottom of the guide rod 231 is connected to the crushing head 240 , the top of the guide rod 231 is connected to the limit block 232 , and an elastic member 233 sleeved on the outer surface of the guide rod 231 is connected between the limit block 232 and the connecting plate 224 .

[0033] Specifically, there are multiple elastic components 230. In this embodiment, there are four elastic components 230, which are distributed in a rectangular array on the connecting plate 224; the guide rod 231 is vertically arranged; the guide rod 231 and the connecting plate 224 are slidably fitted together; the movement trajectory of the crushing head 240 is constrained by the guide rod 231 to prevent it from lateral displacement or swinging during the impact process, thereby ensuring that the impact force is concentrated on the concrete waste and improving the crushing efficiency; the limit block 232 is used to prevent the guide rod 231 from being separated from the connecting plate 224; the elastic member 233 is preferably a spring, and a cylindrical coil spring is used; when the crushing head 240 impacts the concrete waste, the elastic member 233 stretches, absorbs the impact energy, reduces the vibration of the equipment, and makes the impact energy of the crushing head 240 more concentrated on the concrete block, thereby improving the single crushing efficiency by 15%-20%.

[0034] Reference Figure 1 and Figure 3 In this embodiment, the steel bar extraction mechanism 400 includes a ring guide rail conveyor line 410, a telescopic member 420 and an electromagnet 430; The circular guide rail conveyor line 410 is connected to a plurality of telescopic members 420 , and the telescopic ends of the telescopic members 420 are connected to electromagnets 430 ; Specifically, the annular guide rail conveyor line 410 is installed on the top of the box body 10, and a plurality of sliding seats 411 are installed at the bottom of the annular guide rail conveyor line 410, and the plurality of sliding seats 411 are located in the box body 10, and a telescopic member 420 is installed at the bottom of the sliding seat 411; the number of sliding seats 411 is consistent with the number of telescopic members 420, and can be designed according to actual conditions; the model of the annular guide rail conveyor line 410 can be D612, and the specific structure and working principle of the annular guide rail conveyor line 410 are common knowledge, so they are not described in detail here, and the annular guide rail conveyor line 410 can be configured as a commercially available product. Of course, those skilled in the art can also make routine improvements based on existing products; the telescopic member 420 can be a cylinder, an electric cylinder or a hydraulic cylinder. In this embodiment, the telescopic member 420 is preferably an electric cylinder. The specific structure and working principle of the telescopic member 420 are common knowledge, so they are not described in detail here; the specific structure and working principle of the electromagnet 430 are common knowledge, so they are not described in detail here.

[0035] An installation plate 440 is installed on the telescopic end of the telescopic part 420. A placement groove is provided at the bottom of the installation plate 440. An electromagnet 430 is installed in the placement groove, so that the electromagnet 430 can better magnetically attract the steel bars, thereby avoiding magnetic attraction between the electromagnet 430 and other metal components such as the inner wall of the box 10, causing damage to the telescopic end of the telescopic part 420.

[0036] Among them, reference Figure 1 and Figure 3 , the annular guide rail conveyor line 410 is used to drive the telescopic member 420 to move between the second conveying mechanism 300 and the steel bar discharge port 30; Specifically, the circular guide rail conveyor line 410 realizes continuous cycle operation without manual intervention, and can match the concrete waste conveying rhythm of the second conveying mechanism 300 to improve the steel bar recovery efficiency.

[0037] The electromagnet 430 is used to magnetically attract the steel bars in the concrete fragments.

[0038] Specifically, the electromagnet 430 is energized to generate magnetism, and deenergized to demagnetize it, so that it can be used to adsorb ferromagnetic materials such as steel bars. The linkage design of the telescopic member 420 and the electromagnet 430 can accurately control the adsorption position to adapt to steel bars of different sizes and avoid missed adsorption or accidental adsorption. The electromagnet 430 uses its magnetic properties to only adsorb ferromagnetic steel bars, without mechanical contact with concrete fragments, thus avoiding secondary crushing of concrete blocks and mixing with steel bars, thereby improving the purity of steel bar recovery. The adjustability of the telescopic member 420 can adapt to changes in the height of waste accumulation, ensure a reasonable distance between the electromagnet 430 and the surface of the concrete waste, and optimize the adsorption effect. The on and off control of the electromagnet 430 is simple, with low maintenance costs, and the strength of the magnetic force can be controlled by adjusting the current to adapt to steel bars of different diameters (such as thin steel bars or steel mesh).

[0039] The annular guide rail conveyor line 410 drives the telescopic part 420 and the electromagnet 430 to move along a preset trajectory. When the electromagnet 430 moves above the second conveying mechanism 300, the telescopic part 420 extends, allowing the electromagnet 430 to approach the concrete fragments. After the electromagnet 430 is energized, a strong magnetic field is generated to absorb the steel bars in the concrete fragments. Then the telescopic part 420 retracts, and the annular guide rail conveyor line 410 transfers the steel bars to the steel bar discharge port 30. After reaching above the steel bar discharge port 30, the electromagnet 430 is powered off and demagnetized, and the steel bars fall and are discharged from the box 10 through the steel bar discharge port 30, completing the extraction process. After the steel bars are extracted, the concrete fragments continue to be conveyed by the second conveying mechanism 300 to the multi-stage crushing mechanism 500, realizing the complete separation of "steel bar-concrete" of the waste, laying the foundation for the subsequent recycling of concrete, complying with the concept of green construction, and the non-contact extraction method reduces equipment wear and extends the service life of the entire device.

[0040] Reference Figure 1 、 Figure 4 and Figure 7 In this embodiment, the multi-stage crushing mechanism 500 includes a crushing trough 510, a crushing and grinding head 520, and a crankshaft assembly 530; The crushing trough 510 is located below the discharge end of the second conveying mechanism 300. A crushing and grinding head 520 is rotatably installed in the crushing trough 510. The crankshaft assembly 530 passes through the crushing and grinding head 520 and the bottom wall of the crushing trough 510. Specifically, the crushing groove 510 can be connected to the inner wall of the box body 10, which provides a space for squeezing and grinding concrete fragments and withstands the impact load during the crushing process.

[0041] Crushing teeth 540 are provided on the upper part of the crushing trough 510 and the crushing grinding head 520 to facilitate crushing concrete fragments. The bottom of the crushing trough 510 is connected to a collecting hopper 550, and the lower side of the collecting hopper 550 is connected to the concrete discharge port 40 through a pipe to facilitate centralized discharge.

[0042] Among them, reference Figure 1 and Figure 4 The crankshaft assembly 530 is used to drive the crushing and grinding head 520 to rotate eccentrically in the crushing trough 510 to perform multi-stage crushing and grinding on the concrete fragments.

[0043] Specifically, the crankshaft assembly 530 drives the crushing and grinding head 520 to rotate eccentrically in the crushing trough 510, producing a combined shearing, extrusion, and grinding effect on the concrete fragments. The crushing and grinding head 520 eccentrically driven by the crankshaft assembly 530 meets the standards for recycled concrete aggregate (GB / T 25177-2010) or roadbed filler through the grading effect of "coarse crushing-fine grinding". In addition, the eccentrically driven grinding motion reduces energy consumption by 15%-20% compared to the high-speed impact of traditional hammer crushing.

[0044] Reference Figure 1 and Figure 4 The crankshaft assembly 530 includes a third rotating shaft 531, a curved rod 532 and a fourth rotating shaft 533 from top to bottom. The third rotating shaft 531, the curved rod 532 and the fourth rotating shaft 533 are all vertically arranged. The third rotating shaft 531 is rotatably connected to the top of the box body 10. The bottom of the third rotating shaft 531 is eccentrically connected to the curved rod 532. The curved rod 532 passes through the crushing and grinding head 520 and the bottom wall of the crushing trough 510 and is connected to the top of the fourth rotating shaft 533. The axes of the third rotating shaft 531 and the fourth rotating shaft 533 are the same; the upper part of the fourth rotating shaft 533 is located in the collecting hopper 550, and the lower part of the fourth rotating shaft 533 passes through the bottom of the collecting hopper 550 and is rotatably connected to the bottom of the box body 10. The fourth rotating shaft 533 and the collecting hopper 550 can be rotatably connected through a sealed bearing.

[0045] In this embodiment, the crushing groove 510 includes, from top to bottom, a first inclined portion 511, a first vertical portion 512, and a concave portion 513; Reference Figure 1 and Figure 4 The first inclined portion 511 is funnel-shaped and is located below the discharge end of the second conveying mechanism 300 . The top of the concave portion 513 is connected to the first vertical portion 512 .

[0046] Specifically, the first inclined portion 511 serves as a material guide, and its upper port diameter matches the discharge width of the second conveying mechanism 300. The inclination angle can be 45°-60°, ensuring that the concrete fragments slide smoothly down by gravity; the first vertical portion 512 provides movement space for the crushing and grinding head 520, ensuring that the concrete fragments are continuously impacted and ground in the vertical plane; the concave portion 513 is arranged in an arc shape, and a gradually shrinking gap is formed between it and the bottom of the crushing and grinding head 520, which produces an extrusion and grinding effect on the concrete fragments, refines the particle size, and the arc bottom reduces the dead corners of material accumulation, guides the fine crushed materials to move to the collecting hopper 550, and reduces the risk of blockage.

[0047] Crushing teeth 540 are provided on the sides of the first inclined portion 511 and the first vertical portion 512 facing the crushing and grinding head 520. When the concrete fragments on the second conveying mechanism 300 fall onto the first inclined portion 511, the concrete fragments can be initially crushed by the crushing teeth 540 on the first inclined portion 511; a discharge port 514 connected to the collecting hopper 550 is provided at the bottom of the concave portion 513, and the curved rod 532 passes through the discharge port 514.

[0048] Reference Figure 4 and Figure 7 In this embodiment, the crushing and grinding head 520 includes, from top to bottom, a second inclined portion 521, a second vertical portion 522, and a convex portion 523; The inclination direction of the second inclined portion 521 is opposite to that of the first inclined portion 511, and the bottom of the second inclined portion 521 is lower than the bottom of the first inclined portion 511. There is a gap between the second vertical portion 522 and the first vertical portion 512. The convex portion 523 is adapted to the concave portion 513, and there is a certain gap between them.

[0049] Specifically, the second inclined portion 521 is in the shape of a frustum, and the inclination angle can be 45°-75°. The top of the second inclined portion 521 can be higher than the upper end diameter of the first inclined portion 511; the bottom of the second inclined portion 521 is lower than the bottom of the first inclined portion 511, forming a "drop-type" In the feeding space, when the concrete fragments slide down from the first inclined portion 511, they will hit the second inclined portion 521 inclined in the opposite direction, resulting in secondary crushing, further crushing the concrete fragments, and making the top of the second vertical portion 522 lower than the top of the first vertical portion 512, so that larger concrete fragments are between the intersection of the second inclined portion 521 and the second vertical portion 522 and the first vertical portion 512, and the crushing teeth 540 can better crush the larger concrete fragments, so that the larger concrete fragments can enter the gap between the second vertical portion 522 and the first vertical portion 512 after being crushed, and undergo tertiary crushing; through the cooperation of the convex portion 523 and the concave portion 513, when the concrete fragments rotate to the bottom with the crushing and grinding head 520, they will be subjected to the dual effects of extrusion and grinding, thereby refining the particle size.

[0050] Crushing teeth 540 are provided on the sides of the second inclined portion 521 and the second vertical portion 522 facing the crushing trough 510. The crushing teeth 540 on the second vertical portion 522 can be staggered with the crushing teeth 540 on the first vertical portion 512 to improve the crushing effect. The first inclined portion 511 and the second inclined portion 521 cause the concrete fragments to be impacted and crushed when falling, thereby reducing the load on the main crushing section (i.e., the crushing area of the second vertical portion 522 and the first vertical portion 512), and improving the overall crushing efficiency by 25%. Through the cooperation of the crushing trough 510 and the crushing and grinding head 520, the concrete fragments are crushed in the following steps: primary crushing, secondary crushing, tertiary crushing, and fine grinding. Together with the primary crushing of the crushing head 240, there are four crushing and grinding steps in total, forming an efficient crushing and grinding path, thereby improving the crushing effect.

[0051] Reference Figure 1 In this embodiment, the concrete waste recycling device also includes a linkage assembly 600, which is connected to the output end of the driving member 210, and the crankshaft assembly 530 is connected to the linkage assembly 600. The power of the driving member 210 is transmitted to the crankshaft assembly 530 through the linkage assembly 600, so that the crushing and grinding head 520 rotates eccentrically.

[0052] Specifically, the linkage assembly 600 includes a first bevel gear 610 and a second bevel gear 620. The first bevel gear 610 is connected to the second rotating shaft 212 of the driving member 210. The first bevel gear 610 is vertically arranged. The first bevel gear 610 is meshed and connected with the second bevel gear 620. The second bevel gear 620 is horizontally arranged. The second bevel gear 620 is connected to the third rotating shaft 531 extending to the outside of the box body 10 (the third rotating shaft 531 can pass through the middle space of the annular guide rail conveyor line 410 and extend to the top of the annular guide rail conveyor line 410).

[0053] The first bevel gear 610 is driven to rotate by the second rotating shaft 212 of the driving member 210, thereby driving the second bevel gear 620 to rotate, and then driving the third rotating shaft 531, the crankshaft 532 and the fourth rotating shaft 533 to rotate, thereby driving the crushing and grinding head 520 to rotate eccentrically; the linkage assembly 600 ensures the synchronization of the movement of the crankshaft assembly 530 and the crushing and grinding head 520, so that the crushing force acts evenly on the concrete fragments, and the crushing efficiency is improved by 15%; the movement of the crushing head 240 and the crushing and grinding head 520 is achieved by a single driving member 210, which solves the problems of high energy consumption, high cost and complex control of traditional multi-motor drive systems.

[0054] In this embodiment, the driving member 210, the linkage assembly 600 and the telescopic member 420 are all provided with a protective shell (not shown in the figure) on the outside to prevent them from being affected by dust.

[0055] Working principle: When in use, concrete waste is put into the feed hopper 20, and the concrete waste is guided by the buffer guide plate 710 and falls on the feed end of the first conveying mechanism 100. The first conveying mechanism 100 conveys the concrete waste. During the conveying process, the driving member 210 drives the first rotating shaft 211 to rotate, thereby driving the turntable 221 to rotate, and the turntable 221 drives the eccentric shaft 225 to rotate, thereby driving the connecting rod 222 to move, and the connecting rod 222 drives the lifting column 223 to make vertical movement, thereby driving the crushing head 240 to make vertical movement, and the first conveying mechanism 10 0 is initially crushed to separate the concrete blocks from the internal steel bars. The separated concrete blocks and steel bars fall from the discharge end of the first conveying mechanism 100 onto the guide plate 50, and after being guided by the guide plate 50, fall onto the feed end of the second conveying mechanism 300. The second conveying mechanism 300 conveys the concrete blocks and steel bars. During the conveying process, the circular guide rail conveyor line 410 drives the telescopic member 420 and the electromagnet 430 to move along the preset track. When the electromagnet 430 moves to the top of the second conveying mechanism 300, the telescopic member 420 extends, so that the electromagnet 430 0 is close to the concrete fragments, and the electromagnet 430 is energized to generate a strong magnetic field to absorb the steel bars in the concrete fragments. Then the telescopic member 420 retracts, and the annular guide rail conveyor line 410 moves the steel bars to the steel bar discharge port 30. After reaching the top of the steel bar discharge port 30, the electromagnet 430 is powered off and demagnetized, and the steel bars fall and are discharged from the box body 10 through the steel bar discharge port 30, completing the extraction process. After the steel bars are extracted, the concrete fragments continue to be conveyed to the crushing trough 510 by the second conveying mechanism 300. When the concrete fragments on the second conveying mechanism 300 fall on the first inclined portion 511, they can be transported to the crushing trough 510 through the second conveying mechanism 300. The crushing teeth 540 on an inclined portion 511 perform the initial crushing of the concrete fragments. When the concrete fragments slide down from the first inclined portion 511, they will hit the second inclined portion 521 inclined in the opposite direction, resulting in secondary crushing. Then the concrete fragments enter the gap between the second vertical portion 522 and the first vertical portion 512 and are crushed for the third time. Finally, the convex portion 523 and the concave portion 513 cooperate to grind the concrete fragments and refine the particle size. The refined concrete fragments enter the collecting hopper 550 through the discharge port 514 and are finally discharged from the concrete discharge port 40.

[0056] The present invention realizes the refined treatment of waste through the modular design of "primary crushing-rebar extraction-secondary crushing-tertiary crushing-quaternary crushing-fine grinding". Compared with traditional single crushing equipment, the resource utilization rate is improved by about 40%. In addition, transportation, crushing and extraction are all completed by machinery, which reduces manual intervention, improves processing efficiency, is easy to operate, reduces the labor intensity of staff, and realizes the efficient resource utilization of concrete waste, which is of great significance to promoting green building and circular economy.

[0057] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0058] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0059] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A concrete waste recycling device for construction, characterized in that: include: A first conveying mechanism (100), the first conveying mechanism (100) being used to convey concrete waste; A primary crushing mechanism (200), the primary crushing mechanism (200) being provided corresponding to the first conveying mechanism (100), the primary crushing mechanism (200) being used for preliminarily crushing concrete waste into concrete fragments and steel bars, so as to separate the concrete fragments from the internal steel bars; a second conveying mechanism (300), the second conveying mechanism (300) being located below the discharge end of the first conveying mechanism (100), the second conveying mechanism (300) being used to convey concrete fragments and steel bars; A steel bar extraction mechanism (400), the steel bar extraction mechanism (400) being provided corresponding to the second conveying mechanism (300), and the steel bar extraction mechanism (400) being used to extract the separated steel bars so as to recycle the steel bars in the concrete fragments; A multi-stage crushing mechanism (500) is located below the discharge end of the second conveying mechanism (300). The multi-stage crushing mechanism (500) is used to perform multi-stage crushing on concrete fragments so that the recovered concrete meets the use requirements.

2. The construction waste concrete recycling device according to claim 1, characterized in that: The primary crushing mechanism (200) comprises a driving member (210), an eccentric assembly (220), an elastic assembly (230), and a crushing head (240); An eccentric assembly (220) is connected to the output end of the driving member (210), the eccentric assembly (220) is connected to an elastic assembly (230), the elastic assembly (230) is connected to a crushing head (240), and the crushing head (240) is located directly above the first conveying mechanism (100); The eccentric assembly (220) is used to drive the crushing head (240) to move up and down in a reciprocating manner, so that the crushing head (240) can perform preliminary crushing on the concrete waste; The elastic component (230) is used for buffering and shock absorption to improve the stability of the impact crushing of the crushing head (240).

3. The construction waste concrete recycling device according to claim 2, characterized in that: The eccentric assembly (220) comprises a rotating disk (221), a connecting rod (222), a lifting column (223) and a connecting plate (224); The turntable (221) is connected to the output end of the driving member (210), one end of a connecting rod (222) is eccentrically connected to the turntable (221), the other end of the connecting rod (222) is rotatably connected to a lifting column (223), a connecting plate (224) is installed at the bottom of the lifting column (223), and the connecting plate (224) is connected to the elastic component (230).

4. The construction waste concrete recycling device according to claim 3, characterized in that: The elastic component (230) comprises a guide rod (231), a limit block (232) and an elastic member (233); The guide rod (231) vertically penetrates the connecting plate (224); the bottom of the guide rod (231) is connected to the crushing head (240); the top of the guide rod (231) is connected to the limit block (232); and an elastic member (233) sleeved on the outer surface of the guide rod (231) is connected between the limit block (232) and the connecting plate (224).

5. The construction waste concrete recycling device according to claim 1, characterized in that: The steel bar extraction mechanism (400) comprises a ring-shaped guide rail conveyor line (410), a telescopic member (420), and an electromagnet (430); A plurality of telescopic members (420) are connected to the annular guide rail conveyor line (410), and an electromagnet (430) is connected to the telescopic ends of the telescopic members (420); The annular guide rail conveyor line (410) is used to drive the telescopic member (420) to move between the second conveying mechanism (300) and the steel bar discharge port (30); The electromagnet (430) is used to magnetically adsorb the steel bars in the concrete fragments.

6. The construction waste concrete recycling device according to claim 2, characterized in that: The multi-stage crushing mechanism (500) comprises a crushing trough (510), a crushing and grinding head (520), and a crankshaft assembly (530); The crushing trough (510) is located below the discharge end of the second conveying mechanism (300), a crushing and grinding head (520) is rotatably provided in the crushing trough (510), and the crankshaft assembly (530) passes through the crushing and grinding head (520) and the bottom wall of the crushing trough (510); The crankshaft assembly (530) is used to drive the crushing and grinding head (520) to rotate eccentrically in the crushing trough (510) to perform multi-stage crushing and grinding on the concrete fragments.

7. The construction waste concrete recycling device according to claim 6, characterized in that: The crushing groove (510) comprises, from top to bottom, a first inclined portion (511), a first vertical portion (512), and a concave portion (513); The first inclined portion (511) is arranged in a funnel shape. The first inclined portion (511) is located below the discharge end of the second conveying mechanism (300). The top of the concave portion (513) is connected to the first vertical portion (512).

8. The construction waste concrete recycling device according to claim 7, characterized in that: The crushing and grinding head (520) comprises, from top to bottom, a second inclined portion (521), a second vertical portion (522), and a convex portion (523); The inclination direction of the second inclined portion (521) is opposite to the inclination direction of the first inclined portion (511), and the bottom of the second inclined portion (521) is lower than the bottom of the first inclined portion (511). There is a gap between the second vertical portion (522) and the first vertical portion (512), and the convex portion (523) and the concave portion (513) are adapted to each other, and there is a certain gap between them.

9. The construction waste concrete recycling device according to claim 8, characterized in that: The concrete waste recycling device further comprises a linkage assembly (600), wherein the linkage assembly (600) is connected to the output end of the driving member (210), and the crankshaft assembly (530) is connected to the linkage assembly (600), and the power of the driving member (210) is transmitted to the crankshaft assembly (530) through the linkage assembly (600), so as to cause the crushing and grinding head (520) to rotate eccentrically.

10. The construction waste concrete recycling device according to claim 1, characterized in that: The concrete waste recycling device further comprises a buffer assembly (700), the buffer assembly (700) being located above the feed end of the first conveying mechanism (100), and the buffer assembly (700) being used to buffer concrete waste falling onto the first conveying mechanism (100), thereby reducing the impact force generated by the concrete waste falling onto the first conveying mechanism (100).

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