Device for producing recycled concrete by using construction waste and use method of device

Abstract

The invention provides a device for producing recycled concrete by using construction waste and a use method of the device, which are used for solving the problem of low strength of the recycled concrete in the prior art, and the device comprises a crushing mechanism, a screening mechanism, a magnetic separation mechanism and a mixing mechanism, a rotating disc, a first material receiving piece and a second material receiving piece are arranged in the separation cavity, a first aggregate outlet is formed between the rotating disc and the first material receiving piece, a second aggregate outlet is formed between the first material receiving piece and the second material receiving piece, a third aggregate outlet is formed between the discharging section of the shell and the second material receiving piece, and the rotating assembly drives the rotating disc to rotate; the concrete particles are divided into the first aggregate in the first weight range, the second aggregate in the second weight range and the third aggregate in the third weight range under the action of centrifugal force, that is, impurities such as soil and wood mixed in the delayed coagulation soil particles are screened out, so that the strength of the recycled concrete is improved.

Description

Technical Field

[0001] The present invention belongs to the field of construction waste recycling, and in particular relates to a device for producing recycled concrete using construction waste and a method for using the device. Background Art

[0002] In recent years, with the rapid advancement of urbanization, urban construction and renovation have continued to accelerate. Large-scale urban renewal, infrastructure construction projects, and real estate development have led to the demolition of numerous old buildings. The resulting amount of construction waste is enormous and continues to increase year by year. If this massive amount of construction waste is not properly handled, it will cause a series of serious environmental problems.

[0003] Currently, construction waste is typically disposed of through landfill and stockpiling, two traditional methods. However, both methods present numerous drawbacks. From a land resource perspective, the indiscriminate landfilling and stockpiling of large quantities of construction waste consumes valuable land resources. This encroachment, particularly at a time when urban land resources are increasingly scarce, further exacerbates the contradiction between land supply and demand, hindering sustainable urban development. Furthermore, after landfilling, hazardous substances in construction waste can seep into the ground through rainwater, causing severe contamination of the groundwater environment.

[0004] Given the numerous problems with traditional treatment methods, resource utilization of construction waste has become an inevitable trend. Waste concrete and bricks and stones found in construction waste can be crushed to produce recycled aggregate, which can partially or completely replace natural aggregate in concrete production. This not only reduces the exploitation of natural sand and gravel resources and minimizes damage to the natural environment, but also effectively addresses the environmental issues caused by the accumulation of construction waste, achieving resource recycling.

[0005] However, the strength of recycled aggregates produced by existing construction waste treatment equipment after being prepared into recycled concrete is relatively low, which limits the application scenarios of recycled concrete produced by recycled aggregates. Summary of the Invention

[0006] In view of the above shortcomings of the prior art, the object of the present invention is to provide a device for producing recycled concrete using construction waste and a method for using the same, so as to solve the problem of low strength of recycled concrete in the prior art.

[0007] To achieve the above-mentioned and other related purposes, the present invention provides a device for producing recycled concrete using construction waste, comprising: a crushing mechanism for crushing waste concrete to form concrete particles; a screening mechanism for screening concrete particles to screen out a first aggregate having a first weight range, a second aggregate having a second weight range, and a third aggregate having a third weight range; a magnetic separation mechanism for separating steel bars from the second aggregate; a mixing mechanism for mixing the second aggregate after separation of the steel bars with cement to form recycled concrete; wherein the screening mechanism comprises a base, a shell, a rotating disk, a first material receiving member, a second material receiving member, and a rotating assembly; a separation chamber is provided in the shell, and the shell comprises a feeding section, a connecting section, and a discharging section, the connecting section is located between the feeding section and the discharging section, and a The cam is an angular channel that receives the material from the feeder and the second channel, and the cam is a channel that receives the material from the feeder and the second channel.

[0008] Optionally, the rotating assembly includes a first motor, a first pulley, a second pulley, a first belt and a first rotating shaft; the first motor is arranged on the base, one end of the first rotating shaft is rotatably connected to the base, and the other end is connected to the rotating disk; the first pulley is arranged on the output shaft of the first motor, the second pulley is arranged on the first rotating shaft, and the first belt is sleeved on the first pulley and the second pulley.

[0009] Optionally, the rotating assembly further includes a sleeve, which is sleeved on the first rotating shaft, the inner wall of the sleeve is gap-fitted with the outer wall of the first rotating shaft, one end of the sleeve is rotatably connected to the rotating disk, and the other end is connected to the base.

[0010] Optionally, the connecting section is gradually narrowed from the connection with the discharge section to the connection with the feed section; and the feed section is gradually expanded from the connection with the connecting section to the end away from the connecting section.

[0011] Optionally, the rotating disk includes an upwardly curved section, a downwardly concave section and a conical convex section, and the downwardly concave section is located between the upwardly curved section and the convex section.

[0012] Optionally, the rotating disk further comprises a plurality of blades arranged at intervals, wherein the blades are arranged on the upper surfaces of the upwardly curved section and the downwardly concave section, and part of the blades is located on the upper surface of the convex section.

[0013] Optionally, there are two screening mechanisms, and a blocking component is provided at the discharge port of the crushing mechanism, and the blocking component is used to selectively transfer concrete particles to any screening mechanism.

[0014] Optionally, the blocking assembly includes a second motor, a first gear, a second gear, a second rotating shaft, a blocking plate and two guide plates; the two blocking plates are symmetrically and obliquely arranged at the discharge port of the crushing mechanism, and an opening for passing concrete particles is formed between the lower ends of the two blocking plates; the second motor is arranged on the crushing mechanism, and the second rotating shaft is rotatably arranged on the crushing mechanism; the first gear is connected to the output shaft of the second motor, one end of the second rotating shaft is connected to the second gear, and the other end is connected to the blocking plate, the blocking plate is located below the opening, and the first gear and the second gear are meshed.

[0015] Optionally, the magnetic separation mechanism includes a magnetic conveyor belt, a drive assembly, a first receiving piece, a second receiving piece and a scraper; the head end of the magnetic conveyor belt is arranged below the second aggregate outlet, and the drive assembly is used to drive the magnetic conveyor belt to move; the first receiving piece and the second receiving piece are arranged at intervals at the end of the magnetic conveyor belt, the first receiving piece is used to receive the steel bars in the second aggregate, and the second receiving piece is used to receive the recycled aggregate in the second aggregate; the upper end of the scraper abuts the magnetic conveyor belt, and the lower end is located in the first receiving piece.

[0016] On the other hand, a method for using a device for producing recycled concrete using construction waste is also provided, including a device for producing recycled concrete using construction waste as described above, and further comprising: step 1: placing waste concrete into a crushing mechanism for crushing to obtain concrete particles; step 2: using a screening mechanism to screen the concrete particles entering the separation chamber to separate the concrete particles into a first aggregate within a first weight range, a second aggregate within a second weight range, and a third aggregate within a third weight range; step 3: using a magnetic separation mechanism to screen the second aggregate to separate the second aggregate into steel bars and recycled aggregate; step 4: using a mixing mechanism to mix the recycled aggregate and cement to form recycled concrete.

[0017] As described above, the present invention provides a device for producing recycled concrete using construction waste and a method for using the same, which have at least the following beneficial effects: a separation chamber is provided in the shell of the screening mechanism, and a rotating disk, a first material receiving member, and a second material receiving member are provided in the separation chamber, a first aggregate outlet is provided between the rotating disk and the first material receiving member, a second aggregate outlet is provided between the first material receiving member and the second material receiving member, and a third aggregate outlet is formed between the discharge section of the shell and the second material receiving member, and the rotating disk is driven to rotate by a rotating assembly, so that the concrete particles accumulated on the rotating disk are divided into first aggregate in a first weight range, second aggregate in a second weight range, and third aggregate in a third weight range under the action of centrifugal force, that is, impurities such as soil and wood mixed in the slow-setting soil particles are screened out, and the size of the recycled aggregate that meets the expected requirements can also be screened out, thereby improving the strength of the recycled concrete and ensuring the service life of the constructed building. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a simplified schematic diagram of an apparatus for producing recycled concrete using construction waste according to the present invention.

[0019] Figure 2 Shown is a schematic structural diagram at an angle of a screening mechanism of a device for producing recycled concrete using construction waste according to the present invention.

[0020] Figure 3 This is a schematic structural diagram showing an angle of a screening mechanism of a device for producing recycled concrete using construction waste according to the present invention, with part of the shell omitted.

[0021] Figure 4 Shown is a schematic cross-sectional structural diagram of a screening mechanism of an apparatus for producing recycled concrete using construction waste according to the present invention.

[0022] Figure 5 Display as Figure 4 A magnified schematic diagram of point A in FIG.

[0023] Figure 6 Shown is a schematic structural diagram of an angle of a crushing mechanism of a device for producing recycled concrete using construction waste according to the present invention.

[0024] Figure 7 Shown is a schematic structural diagram from another angle of the crushing mechanism of the device for producing recycled concrete using construction waste according to the present invention.

[0025] Figure 8 Shown is a schematic cross-sectional structural diagram of a crushing mechanism of an apparatus for producing recycled concrete using construction waste according to the present invention.

[0026] Figure 9The figure shows a simplified structural diagram of a magnetic separation mechanism of an apparatus for producing recycled concrete using construction waste according to the present invention.

[0027] Component number description:

[0028] 1. Crushing mechanism, 11. Blocking assembly, 111. Second motor, 112. First gear, 113. Second gear, 114. Second rotating shaft, 1141. Bending section, 115. Blocking plate, 116. Guide plate, 12. First discharging section, 13. Second discharging section, 131. First rear side plate, 132. Second rear side plate, 133. Third rear side plate, 134. Collection trough;

[0029] 2. Screening mechanism, 21. Base, 22. Shell, 221. Separation chamber, 222. Feed section, 2221. Feed port, 223. Connecting section, 224. Discharge section, 2241. First horn section, 2242. Cylindrical section, 2243. Second horn section, 2244. Separating plate, 2245. Inclined plate, 2246. Receiving plate, 2247. Connecting column, 23. Rotating disk, 231. Upward section, 232. Concave section, 233. Raised section, 234, blade, 24, first material receiving member, 25, second material receiving member, 26, rotating assembly, 261, first motor, 262, second pulley, 263, first rotating shaft, 264, sleeve, 27, first aggregate discharge port, 271, first aggregate collecting member, 28, second aggregate discharge port, 29, third aggregate discharge port, 291, third aggregate collecting member, 30, dust removal assembly, 301, pump body, 302, second collection pipe;

[0030] 3. Magnetic separation mechanism, 31. Magnetic conveyor belt, 32. First receiving member, 33. Second receiving member, 34. Scraper;

[0031] 4. Hybrid mechanism. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0034] The following embodiments are for illustration only and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0035] After in-depth research and analysis, it was discovered that existing equipment only uses the magnetic separation mechanism 3 to separate magnetic impurities such as steel bars within the recycled aggregate, while ignoring the separation of the remaining construction waste present in the discarded concrete. This construction waste, other than the discarded concrete, mixed with the recycled aggregate can seriously affect the performance of the recycled concrete. In particular, the soil and wood mixed in the recycled aggregate, due to their strong water absorption, absorb moisture from the concrete, causing changes in the water-cement ratio during mixing, affecting the concrete's fluidity and plasticity. After the concrete hardens, the presence of soil reduces the concrete's internal density, forming weak areas and thus reducing the concrete's strength and durability. Organic impurities such as wood gradually decay in the concrete, creating pores and cracks, further weakening the concrete's structural properties. This results in concrete produced from recycled aggregate having lower strength, making it difficult to meet the actual engineering requirements for concrete strength and weight.

[0036] For this, see Figure 1 The present invention provides a device for regenerating concrete using construction waste, which includes a crushing mechanism 1, a screening mechanism 2, a magnetic separation mechanism 3 and a mixing mechanism 4.

[0037] Crushing mechanism 1 is used to crush waste concrete into concrete particles. Crushing mechanism 1 can be a jaw crusher or a two-stage crushing structure that combines a jaw crusher and an impact crusher. The jaw crusher is used to initially crush large pieces of construction waste into smaller sizes; the impact crusher further refines the crushing to make the crushed particles more uniform in size to meet subsequent screening requirements.

[0038] The screening mechanism 2 is used to screen concrete particles to select a first aggregate within a first weight range, a second aggregate within a second weight range, and a third aggregate within a third weight range. When preparing recycled concrete, the particle size requirements for the recycled aggregate vary depending on the concrete's intended use. Once the desired particle size range for the recycled aggregate is determined, the desired weight range for the recycled aggregate can also be determined. For example, by measuring the density range of the waste concrete and calculating the required volume range for the recycled aggregate, the required weight range for the recycled aggregate can be calculated using a weight formula. The weight of the first aggregate is greater than that of the second aggregate, which in turn is greater than that of the third aggregate. The first aggregate primarily consists of a mixture of waste concrete particles and steel bars, whose weight, after being crushed by the crushing mechanism 1, still exceeds the required weight of the recycled aggregate. The second aggregate primarily consists of a mixture of recycled aggregate and steel bars that, after being crushed by the crushing mechanism 1, meets the required weight. The third aggregate mainly includes waste concrete particles whose weight is less than the weight of the required recycled aggregate after being crushed by the crushing mechanism 1, and a mixture of light impurities such as soil and wood mixed in the uncrushed waste concrete.

[0039] The magnetic separation mechanism 3 is used to separate the steel bars in the second aggregate to obtain recycled aggregate.

[0040] The mixing mechanism 4 is used to mix the second aggregate after separating the steel bars with cement to form recycled concrete. The mixing mechanism 4 can be a mixer truck or a mixing device used to mix the recycled aggregate and cement at a construction site, which is not limited in this embodiment.

[0041] like Figure 2-5As shown, the screening mechanism 2 may include a base 21, a housing 22, a rotating disk 23, a first material receiving member 24, a second material receiving member 25, and a rotating assembly 26. The housing 22 includes a feed section 222, a connecting section 223, and a discharge section 224. The connecting section 223 is located between the feed section 222 and the discharge section 224. The feed section 222, the connecting section 223, and the discharge section 224 enclose a separation chamber 221. The feed section 222 is provided with a feed port 2221 that communicates with the separation chamber 221. The rotating disk 23, the first material receiving member 24, and the second material receiving member 25 are disposed within the separation chamber 221. The top of the first material receiving member 24, the top of the second material receiving member 25, and the discharge section 224 of the housing 22 are in a trumpet-shaped structure. The top of the first material receiving member 24, the top of the second material receiving member 25, and the large end of the discharge section 224 are disposed toward the feed port 2221, and the small end is disposed toward the base 21. The central axis of the first receiving member 24, the second receiving member 25, and the rotating disk 23 coincides with the central axis of the discharge section 224. The first receiving member 24 is located between the rotating disk 23 and the second receiving member 25, while the second receiving member 25 is located between the first receiving member 24 and the discharge section 224 of the housing 22. A first aggregate discharge port 27 is formed between the first receiving member 24 and the rotating disk 23; a second aggregate discharge port 28 is formed between the second receiving member 25 and the first receiving member 24; and a third aggregate discharge port 29 is formed between the discharge section 224 of the housing 22 and the second receiving member 25.

[0042] The first material receiving member 24, the second material receiving member 25, and the material discharging section 224 may respectively include a first horn section 2241, a cylindrical section 2242, and a second horn section 2243. The cylindrical section 2242 is located between the first horn section 2241 and the second horn section 2243. The first horn section 2241 is located at the top of the corresponding first material receiving member 24, the second material receiving member 25, and the material discharging section 224. The second horn section 2243 is located at the bottom of the corresponding first material receiving member 24, the second material receiving member 25, and the material discharging section 224, and is used to connect with the base 21.

[0043] There may be provided between the first material receiving member 24 and the second material receiving member 25, between the second material receiving member 25 and the material discharging section 224, and in the first material receiving member 24.

[0044] The partition plate 2244 can be specifically disposed in the second horn section 2243 to prevent aggregate from accumulating in the separation chamber 221. The partition plate 2244 separates the space between the first receiving member 24 and the second receiving member 25, the space between the second receiving member 25 and the discharge section 224, and the inner side of the first receiving member 24 into two receiving areas.

[0045] Two inclined plates 2245 are symmetrically and spaced apart in each receiving area. The upper end of the inclined plates 2245 is connected to the partition plate 2244, and the lower end is connected to the receiving plate 2246. Each receiving plate 2246 is provided with a discharge hole. Specifically, there are two first aggregate discharge holes 27, two second aggregate discharge holes 28, and two third aggregate discharge holes 29, ensuring that the aggregate can be completely transferred out of the separation chamber 221.

[0046] A plurality of connecting columns 2247 are arranged at intervals in the gaps between the first material receiving piece 24 and the second material receiving piece 25, and between the second material receiving piece 25 and the discharge section 224. Specifically, they can be arranged at the first horn section 2241 and / or the cylindrical section 2242 to connect the first discharge piece, the second discharge piece and the discharge section 224 together to ensure the stability of the mechanism.

[0047] The rotating disk 23 is rotatably mounted on the base 21. The rotating assembly 26 is mounted on the base 21 and is configured to drive the rotating disk 23 to rotate within the housing 22. Specifically, the rotating assembly 26 may include a first motor 261, a first pulley, a second pulley 262, a first belt, and a first rotating shaft 263. The first motor 261 is mounted on the base 21 and is located outside the separation chamber 221. One end of the first rotating shaft 263 is rotatably connected to the base 21 via a bearing, etc., while the other end is fixedly connected to the rotating disk 23. The connecting end of the first rotating shaft 263 and the base 21 passes through the base 21 and is connected to the second pulley 262. The first pulley is coaxial with the output shaft of the first connection. The first belt is mounted on the first and second pulleys 262. In other words, the first motor 261 drives the rotating disk 23 to rotate relative to the base 21 via the first belt transmission mechanism.

[0048] After the concrete particles enter the separation chamber 221 through the feed port 2221, they are first accumulated on the rotating disk 23. The rotating assembly 26 then drives the rotating disk 23 to rotate. The centrifugal force generated by the rotating disk 23 during its rotation drives the concrete particles accumulated on the rotating disk 23 to rotate. At this time, due to the uneven weight of the concrete particles, the first aggregate in the first weight range will fall into the gap between the rotating disk 23 and the first receiving piece 24, and then be discharged through the first aggregate outlet; the second aggregate in the second weight range will fall into the gap between the first receiving piece 24 and the second receiving piece 25, and then be discharged through the second aggregate outlet; the third aggregate in the third weight range will fall into the gap between the discharging section 224 and the second receiving piece 25, and then be discharged through the third aggregate outlet. In this way, the concrete particles can be screened to prevent the second aggregate required for subsequent use from containing impurities such as soil or wood that affect the strength of the recycled concrete. The first aggregate exiting the first aggregate outlet 27 first enters a first aggregate collecting member 271, which can be a collection box or other structure. The first aggregate collecting member 271 is then transferred by a conveying mechanism to the crushing mechanism 1 for secondary crushing, thereby improving the utilization rate of the waste concrete. The third aggregate exiting the third aggregate outlet 29 is collected by a third aggregate collecting member 291, which can be a collection box or other structure.

[0049] Furthermore, as the crushed concrete is rotated by the rotating disk 23, it collides with each other. The resulting impact force also separates dirt adsorbed on the surface of the concrete particles, thereby ensuring that no dirt is present in the second aggregate. It is understood that after being crushed, the dirt and wood will also form particles or even dust. Under the action of centrifugal force, due to the lighter weight of the particles or dust formed by the dirt and wood, they will be transported out of the separation chamber 221 through the third aggregate outlet, rather than out of the first aggregate outlet 27 and the second aggregate outlet 28.

[0050] It is understandable that when the weight of the required recycled aggregate changes, the speed of the rotating disk 23 driven by the first motor 261 can be adjusted, and the screening mechanism 2 can be used to select the desired recycled aggregate.

[0051] like Figure 5As shown, the rotating assembly 26 may further include a sleeve 264, which is sleeved on the first rotating shaft 263, and the inner side wall of the sleeve 264 is loosely fitted with the outer side wall of the first rotating shaft 263. The upper end of the sleeve 264 may be rotatably connected to the bottom of the rotating disk 23 via a bearing or other structure, and the lower end of the sleeve 264 may be fixedly connected to the base 21. In this way, when the first motor 261 drives the rotating disk 23 to rotate, the sleeve 264 will not rotate. The provision of the sleeve 264 can prevent the first aggregate from colliding with the first rotating shaft 263, thereby reducing the service life of the first rotating shaft. At the same time, it can also prevent the first aggregate from accumulating at the connection between the first rotating shaft 263 and the base 21, which would prevent the first motor 261 from being able to drive the first rotating shaft 263 to rotate, thereby damaging the first motor 261.

[0052] like Figure 2 、 4 As shown, the connecting section 223 of the shell 22 is configured to gradually converge from its connection with the discharge section 224 to its connection with the feed section 222, i.e., the diameter of the connecting section 223 gradually decreases. The feed section 222 is configured to gradually expand from its connection with the connecting section 223 to the end away from the connecting section 223, i.e., the diameter of the feed section 222 gradually increases. This creates a "treasure bottle mouth"-like structure at the top of the shell 22. While allowing concrete particles to enter the separation chamber 221, it also effectively prevents the concrete particles from being discharged from the separation chamber 221 through the feed inlet 2221 during centrifugal action.

[0053] like Figure 5 As shown, the rotating disk 23 may include an upward section 231, a concave section 232 and a conical convex section 233, wherein the concave section 232 is located between the upward section 231 and the convex section 233, so that the concrete particles entering the separation chamber 221 through the feed port 2221 can be first accumulated in the concave section 232, so as to be screened by centrifugal action later.

[0054] The rotating disk 23 may further include a plurality of spaced-apart blades 234. The blades 234 are disposed on the upper surfaces of the upwardly curved section 231 and the downwardly concave section 232, with portions of the blades 234 extending onto the upper surface of the raised section 233. The blades 234 thereby divide the upper surface of the rotating disk 23 into a plurality of accumulation areas. Furthermore, the blades 234 are spiral blades 234, so that when the rotating disk 23 rotates, the blades 234 act to drive the concrete particles away from the upper surface of the rotating disk 23.

[0055] See also Figure 2The screening mechanism 2 may also include a dust removal component 30, which includes a pump body 301, a collection box (not shown in the figure), a first collection pipe (not shown in the figure) and a plurality of second collection pipes 302. The pump body 301 may be a suction pump or a vacuum pump, etc., which is arranged on the base 21. The collection box may be arranged on the base 21 or the bottom surface. One end of the first collection pipe is connected to the pump body 301, and the other end is connected to the collection box. One end of the plurality of second collection pipes 302 may be arranged at intervals on the connecting section 223 of the shell 22 and communicate with the separation chamber 221, and the other end is connected to the pump body 301. During the rotation of the rotating disk 23, the pump body 301 may be synchronously acted upon to utilize the suction effect of the pump body 301 to suck out the dust in the separation chamber 221, thereby preventing dust from overflowing from the feed port 2221 and damaging the respiratory tract of the operator or polluting the environment.

[0056] There may be two screening mechanisms 2 , and a blocking component 11 may be provided at the discharge port of the crushing mechanism 1 . The blocking component 11 is used to selectively transfer concrete particles to any one of the screening mechanisms 2 .

[0057] See also Figure 6-8 Specifically, the discharge port of the crushing mechanism 1 may include a first discharge section 12 and a second discharge section 13. The first discharge section 12 is located between the second discharge section 13 and the crushing chamber of the crushing mechanism 1. The first discharge section 12 may be tilted to facilitate collection of concrete particles. The second discharge section 13 may be vertically positioned relative to the ground. The feed openings 2221 of the two screening mechanisms 2 are positioned corresponding to the second discharge section 13. The blocking assembly 11 may include a second motor 111, a first gear 112, a second gear 113, a second rotating shaft 114, a blocking plate 115, and two guide plates 116. The two guide plates 116 are symmetrically and tiltedly positioned on the second discharge section 13 of the crushing mechanism 1. An opening for the passage of concrete particles is formed between the lower ends of the two blocking plates 115. The second motor 111 is mounted on the crushing mechanism 1 and located behind the second discharge section 13. The second rotating shaft 114 is rotatably mounted on the crushing mechanism 1 via a bearing or other structure, specifically on the rear side plate of the second discharge section 13. The first gear 112 and the second gear 113 are meshed. The first gear 112 is connected to the output shaft of the second motor 111. The second gear 113 is connected to one end of the second rotating shaft 114 extending outside the second discharge section 13. The other end of the second rotating shaft 114 is connected to a blocking plate 115, and the blocking plate 115 is located below the opening.

[0058] When in use, the second motor 111 drives the blocking plate 115 to rotate, for example Figure 6 The left side of the rotation, the blocking plate 115 is formed Figure 6At this time, all the concrete particles enter one of the screening mechanisms 2 through the blocking effect of the blocking plate 115. When the number of concrete particles entering the screening mechanism 2 reaches the processing quantity of the screening mechanism 2, the second motor 111 drives the blocking plate 115 to move Figure 6 The right rotation forms Figure 6 The state indicated by the dashed line on the right side indicates that the screening mechanism 2 is now in operation, screening concrete particles. At this point, the concrete particles are blocked by the blocking plate 115 and enter the other screening mechanism 2. This reciprocating process allows the two screening mechanisms 2 to operate alternately, improving the utilization rate of the crushing mechanism 1.

[0059] See also Figure 8 The second discharge section 13 of the crushing mechanism 1 of this embodiment includes a first rear side plate 131, a second rear side plate 132, and a third rear side plate 133 connecting the first and second rear side plates 131, 132. The first rear side plate 131 is connected to the first discharge section 12, and the third rear side plate 133 is arranged parallel to the horizontal plane. The third rear side plate 133, the second rear side plate 132, and the third rear side plate 133 enclose a receiving groove. The second rotating shaft 114 includes a bent section 1141, and the bent section 1141 is partially located in the receiving groove. The rotational connection between the second rotating shaft 114 and the second rear side plate 132 is also located in the receiving groove, thereby preventing concrete particles from accumulating at the connection between the second rotating shaft 114 and the second rear side plate 132, which would affect the normal use of the blocking mechanism.

[0060] See also Figure 9 The magnetic separation mechanism 3 may include a mounting base, a magnetic conveyor belt 31, a drive assembly, a first receiving member 32, a second receiving member 33, and a scraper 34. The drive assembly may include a third motor, a third pulley, a fourth pulley, a second belt, and two rotating rollers. The two rotating rollers are spaced apart on the mounting base, and the magnetic conveyor belt 31 is mounted on the two rotating rollers. The fourth pulley may be coaxially mounted on one of the rotating rollers, the third pulley may be coaxially mounted on the output shaft of the third motor, and the second belt may be mounted on the third and fourth pulleys. In this manner, the third motor is used to drive the magnetic conveyor belt 31 to rotate.

[0061] The first receiving member 32 and the second receiving member 33 can be storage troughs or storage boxes, respectively. The first receiving member 32 is used to receive the steel bars in the second aggregate, and the second receiving member 33 is used to receive the recycled aggregate in the second aggregate. Both the first receiving member 32 and the second receiving member 33 are located at the ends of the magnetic conveyor belt 31, with the first receiving member 32 positioned near the head end of the magnetic conveyor belt 31. The head end of the magnetic conveyor belt 31 is located below the second aggregate discharge port 28 of the screening mechanism 2. The upper end of the scraper 34 abuts the magnetic conveyor belt 31, while the lower end is located within the first receiving member 32. The scraper 34 can be used to scrape off the steel bars adsorbed on the magnetic conveyor belt 31 and drop them into the first receiving member 32.

[0062] On the other hand, the present invention also provides a method for using a device for producing recycled concrete using construction waste, comprising the device for producing recycled concrete using construction waste as described above, and further comprising the following steps:

[0063] Step 1: Place the waste concrete into the crushing mechanism 1 for crushing to obtain concrete particles; in this step, the blocking component 11 is also opened synchronously to block the discharge port of the crushing mechanism 1 so that the concrete particles passing through the discharge port only enter one of the screening mechanisms 2 at a time.

[0064] Step 2: Screening mechanism 2 screens the concrete particles entering separation chamber 221 to separate them into first aggregate within a first weight range, second aggregate within a second weight range, and third aggregate within a third weight range. During this step, the first aggregate within the first weight range can be reintroduced into crushing mechanism 1 for crushing, thereby increasing the utilization rate of the waste concrete.

[0065] Step 3: Using the magnetic separation mechanism 3 to screen the second aggregate, so as to separate the second aggregate into steel bars and recycled aggregate.

[0066] Step 4: Mix the recycled aggregate and cement using the mixing mechanism 4 to form recycled concrete. In this step, the ratio of cement to recycled aggregate can be adjusted according to different usage requirements to obtain recycled concrete that meets the usage requirements.

[0067] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A device for producing recycled concrete using construction waste, characterized in that: include: A crushing mechanism, wherein the crushing mechanism is used to crush the waste concrete into concrete particles; a screening mechanism for screening concrete particles to screen out a first aggregate having a first weight range, a second aggregate having a second weight range, and a third aggregate having a third weight range; a magnetic separation mechanism, the magnetic separation mechanism being used to separate the steel bars from the second aggregate; a mixing mechanism, the mixing mechanism being used to mix the second aggregate after separation of the steel bars with cement to form recycled concrete; Wherein, the screening mechanism includes a base, a shell, a rotating disk, a first material receiving piece, a second material receiving piece and a rotating assembly; a separation chamber is provided in the shell, the shell includes a feeding section, a connecting section and a discharging section, the connecting section is located between the feeding section and the discharging section, and a feeding port connected to the separation chamber is provided on the feeding section; the rotating disk, the first material receiving piece and the second material receiving piece are arranged in the separation chamber; the top of the first material receiving piece, the top of the second material receiving piece and the discharging section of the shell are trumpet-shaped, and the large ends of the tops of the first material receiving piece, the tops of the second material receiving piece and the discharging section of the shell are arranged toward the feeding port, and the small ends are arranged toward the base , the central axis of the first material receiving piece, the second material receiving piece and the rotating disk is arranged to coincide with the central axis of the discharge section of the shell; the first material receiving piece is located between the rotating disk and the second material receiving piece, and the second material receiving piece is located between the first material receiving piece and the discharge section of the shell; a first aggregate discharge port is formed between the first material receiving piece and the rotating disk; a second aggregate discharge port is formed between the second material receiving piece and the first material receiving piece, and a third aggregate discharge port is formed between the discharge section of the shell and the second material receiving piece; the rotating disk is rotatably arranged on the base, and the rotating assembly is arranged on the base, for driving the rotating disk to rotate in the shell.

2. The device for producing recycled concrete using construction waste according to claim 1, characterized in that: The rotating assembly includes a first motor, a first pulley, a second pulley, a first belt and a first rotating shaft; The first motor is arranged on the base, one end of the first rotating shaft is rotatably connected to the base, and the other end is connected to the rotating disk; the first pulley is arranged on the output shaft of the first motor, the second pulley is arranged on the first rotating shaft, and the first belt sleeve is arranged on the first pulley and the second pulley.

3. The device for producing recycled concrete using construction waste according to claim 2, characterized in that: The rotating assembly also includes a sleeve, which is sleeved on the first rotating shaft. The inner wall of the sleeve is clearance-matched with the outer wall of the first rotating shaft. One end of the sleeve is rotatably connected to the rotating disk, and the other end is connected to the base.

4. The device for producing recycled concrete using construction waste according to claim 1, characterized in that: The connecting section is arranged to be gradually tapered from the connection with the discharging section to the connection with the feeding section; The feeding section is gradually expanded from the connection point with the connecting section to the end away from the connecting section.

5. The device for producing recycled concrete using construction waste according to claim 4, characterized in that: The rotating disk includes an upwardly curved section, a downwardly concave section and a conical convex section, wherein the downwardly concave section is located between the upwardly curved section and the convex section.

6. The device for producing recycled concrete using construction waste according to claim 5, characterized in that: The rotating disk further includes a plurality of blades arranged at intervals, wherein the blades are arranged on the upper surfaces of the upwardly curved section and the downwardly concave section, and parts of the blades are located on the upper surface of the convex section.

7. The device for producing recycled concrete using construction waste according to claim 1, characterized in that: There are two screening mechanisms, and a blocking component is provided at the discharge port of the crushing mechanism. The blocking component is used to selectively transfer concrete particles to any screening mechanism.

8. The device for producing recycled concrete using construction waste according to claim 7, characterized in that: The blocking assembly includes a second motor, a first gear, a second gear, a second rotating shaft, a blocking plate and two guide plates; The two baffles are symmetrically and obliquely arranged at the discharge port of the crushing mechanism, and an opening for passing concrete particles is formed between the lower ends of the two baffles; The second motor is arranged on the crushing mechanism, and the second rotating shaft is rotatably arranged on the crushing mechanism; the first gear is connected to the output shaft of the second motor, one end of the second rotating shaft is connected to the second gear, and the other end is connected to the blocking plate, the blocking plate is located below the opening, and the first gear and the second gear are meshed.

9. The device for producing recycled concrete using construction waste according to claim 1, characterized in that: The magnetic separation mechanism includes a magnetic conveyor belt, a drive assembly, a first receiving piece, a second receiving piece and a scraper; The head end of the magnetic conveyor belt is arranged below the second aggregate outlet, and the driving assembly is used to drive the magnetic conveyor belt to move; The first receiving member and the second receiving member are spaced apart and arranged at the end of the magnetic conveyor belt, the first receiving member is used to receive the steel bars in the second aggregate, and the second receiving member is used to receive the recycled aggregate in the second aggregate; The upper end of the scraper abuts against the magnetic conveyor belt, and the lower end is located in the first receiving part.

10. A method for using a device for producing recycled concrete using construction waste, characterized in that: The device for producing recycled concrete using construction waste according to any one of claims 1 to 9 further comprises: Step 1: Place the waste concrete into the crushing mechanism for crushing to obtain concrete particles; Step 2: screening the concrete particles entering the separation chamber using a screening mechanism to separate the concrete particles into a first aggregate within a first weight range, a second aggregate within a second weight range, and a third aggregate within a third weight range; Step 3: Screening the second aggregate using a magnetic separation mechanism to separate the second aggregate into steel bars and recycled aggregate; Step 4: Utilize a mixing mechanism to mix the recycled aggregate and cement to form recycled concrete.

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