Recycled concrete preparation process and equipment

Abstract

The invention relates to the technical field of concrete preparation, and discloses a recycled concrete preparation process and equipment, and the recycled concrete preparation process comprises the following steps: S1, collecting waste concrete blocks; s2, the collected waste concrete blocks are subjected to crushing treatment through a concrete crusher; s3, the crushed waste concrete particles are cleaned; s4, the dehydrated waste concrete particles are screened; and S5, putting the recycled coarse aggregate, the recycled fine aggregate, the cement, the fly ash and the silica fume into a stirrer, and stirring and mixing. The recycled concrete preparation equipment comprises a concrete crusher; and the switching mechanism comprises a motor installed on the screening bin, a gear is installed on an output shaft of the motor, and two sets of rack plates are connected to the gear in a meshed mode. The motor drives the gears to rotate to drive the two screening frames to alternately slide in the limiting grooves, continuous screening is achieved, the waiting time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete preparation, and more particularly to a process and equipment for preparing recycled concrete. Background Art

[0002] Recycled concrete is made by crushing, cleaning, and grading discarded concrete blocks, mixing them in a specific proportion with a grading agent, and then adding cement and water to partially or completely replace natural aggregates like sand and gravel. As an effective way to recycle waste concrete, recycled concrete technology can reduce the mining of natural sand and gravel and alleviate the environmental impact of construction waste.

[0003] However, in actual processing, waste concrete often contains metal objects such as rebar. Because building structures tightly bond rebar to concrete, and because steel's tensile strength exceeds 400 MPa, far exceeding concrete's compressive strength, existing crushing equipment struggles to effectively separate the two. Even after initial processing, small amounts of metal debris can remain in the recycled aggregate. These metal impurities can disrupt the continuity of the concrete's internal structure, reducing the recycled concrete's compressive strength and shortening the concrete structure's service life. Summary of the Invention

[0004] The present invention provides a recycled concrete preparation process and equipment, which solves the technical problem in the related art that even after preliminary treatment, a small amount of metal debris still remains in the recycled aggregate. The metal impurities will destroy the continuity of the internal structure of the concrete, reduce the compressive strength of the recycled concrete, and shorten the service life of the concrete structure.

[0005] The first aspect of the present invention discloses a process for preparing recycled concrete, comprising the following steps:

[0006] S1, collecting waste concrete blocks, removing impurities on the waste concrete blocks, and spraying the waste concrete blocks;

[0007] S2, crushing the collected waste concrete blocks using a concrete crusher;

[0008] S3, cleaning the crushed waste concrete particles, removing impurities attached to the surface and performing dehydration treatment;

[0009] S4. Screening the dehydrated waste concrete particles, selecting particles with a particle size of 4-10 mm as recycled coarse aggregate, and particles with a particle size of 0.16-4 mm as recycled fine aggregate;

[0010] S5. Put the recycled coarse aggregate, recycled fine aggregate, cement, fly ash and silica fume into a mixer, stir and mix them to obtain recycled concrete.

[0011] A second aspect of the present invention discloses a recycled concrete preparation device, comprising:

[0012] A concrete crusher, comprising a crushing bin with a feed inlet and a discharge outlet;

[0013] Wherein, a material distribution bin is installed on the discharge port, and a screening bin is installed on the material distribution bin;

[0014] A switching mechanism includes a motor installed on the screening bin, and a gear is installed on the output shaft of the motor, two sets of rack plates are meshed and connected to the gear, and a connecting frame is provided on the side of the rack plate away from the gear, a delay mechanism is provided between the rack plate and the connecting frame, a screening frame is installed on the connecting frame, and multiple sets of electromagnets are evenly distributed inside the screening frame.

[0015] As a further optimization solution of the present invention, the electromagnets are arranged in a columnar structure. The electromagnets in the columnar structure are evenly distributed in the screening frame and can adsorb iron slag in concrete fragments in all directions.

[0016] As a further optimization solution of the present invention, a limiting groove adapted to the screening frame is provided inside the screening bin, and the screening frame and the limiting groove are slidably connected.

[0017] As a further optimization scheme of the present invention, the delay mechanism includes a slide groove opened inside the connecting frame, and a slider is slidably connected inside the slide groove, the slider is fixedly connected to the rack plate, a first spring is installed on the slider, and the end of the first spring away from the slider is fixedly connected to the slide groove, and openings adapted to the rack plate are opened on the two groups of connecting frames.

[0018] As a further optimization scheme of the present invention, a fixed frame is installed on the screening bin, and a movable column is slidably connected inside the fixed frame, a sliding frame is installed on the movable column, and a blocking block is installed on the sliding frame, a second spring is provided on the movable column, and the two ends of the second spring are fixedly connected to the fixed frame and the sliding frame respectively.

[0019] As a further optimization solution of the present invention, a limiting block is installed at one end of the connecting frame away from the opening, and a slot is provided on the limiting block, and the slot is adapted to the shape of the block.

[0020] As a further optimization solution of the present invention, the side of the limiting block away from the connecting frame is inclined, and the side of the locking block close to the connecting frame is also inclined.

[0021] As a further optimization scheme of the present invention, a distribution mechanism is provided inside the distribution bin, which is used to disperse and evenly distribute the crushed concrete fragments so that the concrete fragments can enter the screening bin more evenly. The distribution mechanism includes a distribution plate arranged inside the distribution bin, and a number of through openings are opened on the distribution plate. Connecting shafts are symmetrically installed on the distribution plate, and the connecting shafts are rotatably connected to the distribution bin through bearings. The inner sides of the distribution bin are arranged in an arc-shaped structure.

[0022] As a further optimization scheme of the present invention, one group of the connecting shafts is provided with a swing arm installed at one end away from the cloth plate, and a traction groove is provided inside the swing arm. The bearing on the cloth bin is connected to a shaft, and a turntable is installed on the shaft, and an eccentric shaft is installed on the turntable. The traction groove and the eccentric shaft are slidably connected, and the rotating shaft and the shaft are connected through a pulley transmission mechanism.

[0023] The beneficial effects of the present invention are as follows: the present invention drives the two groups of screening frames to slide alternately in the limiting grooves by driving the gears to rotate through a motor. When the electromagnet in the screening frame is energized, it absorbs the iron slag in the concrete fragments, and when the power is off, the iron slag falls off and is discharged. The two groups of screening frames work alternately to achieve continuous and uninterrupted screening, reduce waiting time, and improve production efficiency. The delay mechanism cooperates with the switching mechanism. During the exchange of the screening frames, the limiting effect of the card slot and the card block allows the screening frame in use to remain stationary, and the screening frame to be replaced to operate normally. When the screening frame is about to be replaced, the limiting block lifts the card block to release the limit, and the first spring pulls the screening frame out of the screening bin. The new screening frame completes the replacement through the snap connection, avoiding the omission of metal impurities removal, and further improving the screening accuracy and equipment operation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention Figure 2 ;

[0026] Figure 3 It is a schematic cross-sectional view of the present invention;

[0027] Figure 4 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the cloth distributing mechanism of the present invention;

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the switching mechanism of the present invention;

[0030] Figure 7 It is a schematic diagram of the partial three-dimensional structure of the switching mechanism of the present invention;

[0031] Figure 8 It is a schematic diagram of a partial three-dimensional structure of the delay mechanism of the present invention;

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure of the material distribution bin, screening bin and switching mechanism of the present invention;

[0033] Figure 10 The present invention Figure 9 A magnified view of the structure in the middle.

[0034] In the figure: 11. bracket; 12. crushing bin; 13. feed port; 14. discharge port; 15. rotating shaft; 16. crushing disc; 17. tool; 18. distribution bin; 181. distribution plate; 182. through port; 183. connecting shaft; 184. swing arm; 185. traction trough; 186. eccentric shaft; 187. turntable; 188. shaft; 189. pulley transmission mechanism; 19. screening bin; 21. motor; 22. gear; 23. rack plate; 24. connecting frame; 241. slide; 242. slider; 243. first spring; 244. limit block; 245. fixed frame; 246. movable column; 247. sliding frame; 248. block; 249. second spring; 25. screening frame; 26. electromagnet; 27. limit slot; 28. discharge plate; 29. limit frame. DETAILED DESCRIPTION

[0035] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0036] According to the attached Figure 1 To the attached Figure 10 As shown, a recycled concrete preparation process includes the following steps:

[0037] S1, collecting waste concrete blocks, removing impurities on the waste concrete blocks, and spraying the waste concrete blocks;

[0038] S2, crushing the collected waste concrete blocks using a concrete crusher;

[0039] S3, cleaning the crushed waste concrete particles, removing impurities attached to the surface and performing dehydration treatment;

[0040] S4. Screening the dehydrated waste concrete particles, selecting particles with a particle size of 4-10 mm as recycled coarse aggregate, and particles with a particle size of 0.16-4 mm as recycled fine aggregate;

[0041] S5. Put the recycled coarse aggregate, recycled fine aggregate, cement, fly ash and silica fume into a mixer, stir and mix them to obtain recycled concrete.

[0042] According to the attached Figure 1 To the attached Figure 3 As shown, a recycled concrete preparation device includes a concrete crusher, which includes a bracket 11, a crushing bin 12 is installed on the bracket 11, and the crushing bin 12 is provided with a feed port 13 and a discharge port 14, the internal bearing of the crushing bin 12 is connected to a rotating shaft 15, and a plurality of groups of crushing disks 16 are installed on the rotating shaft 15, and a plurality of groups of cutters 17 are evenly distributed in a ring shape on the crushing disk 16, and the cutters 17 are detachably connected to the crushing disk 16, and the crushing disk 16 and the cutters 17 can be threadedly fixed with bolts.

[0043] Among them, a distribution bin 18 is installed on the discharge port 14, and a screening bin 19 is installed on the distribution bin 18; when working, the crushed concrete fragments are evenly distributed through the distribution bin 18, so that the concrete fragments enter the screening bin 19 for screening, and the metal residues in the fragments are removed. The screening bin 19 can separate the metal residues from the concrete fragments, and finally obtain recycled concrete aggregate that meets the requirements for subsequent concrete preparation work.

[0044] It should be noted that during operation, during the recycled concrete production process, waste concrete to be recycled enters crushing bin 12 through feed port 13. At this point, rotating shaft 15 begins to rotate under power, driving the multiple sets of crushing discs 16 mounted thereon to rotate synchronously. As crushing discs 16 rotate at high speed, cutters 17 fully contact the waste concrete, generating strong shearing and impacting effects, gradually breaking large pieces of waste concrete into smaller fragments. The crushed concrete fragments then fall through discharge port 14 into distribution bin 18. Distribution bin 18 disperses and evenly distributes the concentrated fallen fragments, allowing them to enter screening bin 19 more evenly, separating metal residues from the concrete fragments.

[0045] According to the attached Figure 4 To the attached Figure 5As shown, a distribution mechanism is provided inside the distribution bin 18 , which is used to disperse and evenly distribute the crushed concrete fragments so that the concrete fragments can enter the screening bin 19 more evenly. Specifically, the cloth mechanism includes a cloth plate 181 arranged inside the cloth bin 18, and a plurality of openings 182 are opened on the cloth plate 181, and connecting shafts 183 are symmetrically installed on the cloth plate 181, and the connecting shafts 183 are rotatably connected to the cloth bin 18 through bearings, one end of one set of connecting shafts 183 away from the cloth plate 181 passes through the cloth bin 18 and is installed with a swing arm 184, and a traction groove 185 is opened inside the swing arm 184, a shaft 188 is connected to the bearing on the cloth bin 18, and a turntable 187 is installed on the shaft 188, and an eccentric shaft 186 is installed on the turntable 187, and the traction groove 185 and the eccentric shaft 186 are slidingly connected, and the rotating shaft 15 and the shaft 188 are connected by a pulley transmission mechanism 189.

[0046] The reciprocating swing of the distribution plate 181 and the layout of the opening 182 can evenly disperse the crushed concrete fragments, thereby preventing the fragments from piling up or being unevenly distributed at the entrance of the screening bin 19 .

[0047] Furthermore, uniform distribution ensures that the screening bin 19 contacts every fragment, enabling more efficient identification and separation of metal residues. For example, when fragments fall in a concentrated mass, some metal may be covered by concrete and thus cannot be screened out. However, uniform distribution significantly increases the probability of metal residue being exposed, thereby ensuring the purity of the recycled concrete aggregate.

[0048] It should be understood that the rotating shaft 15 rotates under power, transmitting power to the shaft 188 via the pulley transmission mechanism 189, which drives the rotating disk 187 to rotate synchronously. The eccentric shaft 186 rotates with the rotating disk 187. Because the eccentric shaft 186 is slidably connected to the traction groove 185 inside the swing arm 184, the eccentric shaft 186 slides along the traction groove 185 during rotation, thereby driving the swing arm 184 to swing. Therefore, the swinging of the swing arm 184 causes the distribution plate 181 to swing back and forth about the connecting shaft 183 within the distribution bin 18.

[0049] Furthermore, as the distribution plate 181 swings back and forth, it blocks, disperses, and guides the concrete fragments that fall into the distribution bin 18. The fragments are evenly scattered through the opening 182 as the distribution plate 181 swings, thus dispersing and evenly distributing the crushed concrete fragments, allowing them to enter the screening bin 19 for screening in a relatively uniform manner.

[0050] According to the attached Figure 6 , Attachment Figure 7 and attached Figure 8As shown, a switching mechanism is provided inside the screening bin 19, and the switching mechanism includes a motor 21 installed on the screening bin 19, and a gear 22 is installed on the output shaft of the motor 21, two sets of rack plates 23 are meshed and connected to the gear 22, and a connecting frame 24 is provided on the side of the rack plate 23 away from the gear 22, a screening frame 25 is installed on the connecting frame 24, and a plurality of groups of electromagnets 26 are evenly distributed inside the screening frame 25.

[0051] Among them, the electromagnet 26 is arranged in a columnar structure, and the columnar electromagnet 26 is evenly distributed in the screening frame 25, which can adsorb the iron slag in the concrete fragments in all directions. At the same time, by accurately controlling the power on and off of the electromagnet 26, it is ensured that the iron slag can be completely detached during unloading, further ensuring the accuracy of screening and improving the quality of recycled concrete aggregate.

[0052] Specifically, according to the attached Figure 9 As shown, a limiting groove 27 adapted to the screening frame 25 is provided inside the screening bin 19 , and the screening frame 25 and the limiting groove 27 are slidably connected.

[0053] According to the attached Figure 4 As shown, a discharge plate 28 is also installed on the screening bin 19. When the screening frame 25 slides to the top of the discharge plate 28 and corresponds to the discharge plate 28, the electromagnet 26 is powered off and demagnetized, and the iron slag remaining inside the concrete block can be separated and discharged.

[0054] According to the attached Figure 6 As shown, a limiting frame 29 is installed on the screening bin 19 , and the limiting frame 29 is used to limit the rack plate 23 .

[0055] It should be noted that when the two groups of screening frames 25 need to work alternately, the drive motor 21 rotates, and the motor 21 drives the gear 22 to rotate. As the gear 22 rotates, the two groups of rack plates 23 will move linearly in opposite directions. The rack plate 23 is connected to the screening frame 25 through the connecting frame 24, so the screening frame 25 will also slide synchronously in the limit slot 27.

[0056] Multiple groups of electromagnets 26 evenly distributed inside the screening frame 25 generate magnetism when powered on. When the screening frame 25 is located in the screening bin 19 to receive concrete fragments, the electromagnets 26 can attract magnetic metal residues such as iron slag in the concrete fragments and adsorb them on the surface of the electromagnets 26, thereby achieving preliminary separation of the iron slag and concrete blocks.

[0057] When one set of screening frames 25 completes its screening and adsorption work, the drive motor 21 reverses, driving the gear 22 to rotate, causing the screening frame 25 to slide above the discharge plate 28. At this point, the electromagnet 26 is de-energized and demagnetized. The iron slag adsorbed on the electromagnet 26 loses its magnetic attraction and falls under gravity, exiting the screening bin 19 through the discharge plate 28. Simultaneously, another set of screening frames 25 slides into the screening bin 19 to receive new concrete fragments, and the above screening and adsorption process repeats, achieving continuous and uninterrupted screening.

[0058] The limiting frame 29 limits the movement of the rack plate 23 to ensure that the screening frame 25 slides on a predetermined track, thereby ensuring the stability and accuracy of the switching process.

[0059] According to the attached Figure 8 , Attachment Figure 9 and attached Figure 10 As shown, a delay mechanism is provided between the rack plate 23 and the connecting frame 24, and the delay mechanism includes a slide groove 241 opened inside the connecting frame 24, and a slider 242 is slidably connected inside the slide groove 241, and the slider 242 is fixedly connected to the rack plate 23. A first spring 243 is installed on the slider 242, and the end of the first spring 243 away from the slider 242 is fixedly connected to the slide groove 241. Openings adapted to the rack plate 23 are opened on the two groups of connecting frames 24, and a limit block 244 is installed on the end of the connecting frame 24 away from the opening.

[0060] Among them, a fixed frame 245 is installed on the screening bin 19, and the internal sliding connection of the fixed frame 245 is a movable column 246, a sliding frame 247 is installed on the movable column 246, and a clamping block 248 is installed on the sliding frame 247, a second spring 249 is provided on the movable column 246, and the two ends of the second spring 249 are fixedly connected to the fixed frame 245 and the sliding frame 247 respectively, a clamping slot is provided on the limit block 244, and the clamping slot is adapted to the shape of the clamping block 248, and the side of the limit block 244 away from the connecting frame 24 is inclined.

[0061] It should be noted that when the motor 21 controls the gear 22 to rotate, the gear 22 and the rack plate 23 are engaged and connected, driving the two groups of screening frames 25 to exchange with each other.

[0062] During the exchange process, due to the limiting effect of the card slot and the card block 248, under the limiting effect of the connecting frame 24, the currently used screening frame 25 and electromagnet 26 are controlled to remain stationary, so that the screening frame 25 and electromagnet 26 that need to be replaced can move normally, thereby completing the replacement work.

[0063] When the screening frame 25 and electromagnet 26 are about to be replaced, the limit block 244 pushes the clamping block 248 upward, releasing the limit on the screening frame 25 and electromagnet 26 currently in use. The first spring 243 then pulls the screening frame 25 and electromagnet 26 out and separates them from the screening bin 19. The screening frame 25 and electromagnet 26 currently being replaced engage with the clamping block 248 via the clamping slot, completing the replacement and preventing any metal impurities from being missed during removal. The two groups of screening frames 25 work in an orderly alternating manner thanks to the delay mechanism. While one group of screening frames 25 is performing screening, the other group can be synchronously moved to its working position and placed on standby. This reduces waiting time during the screening process, speeds up the preparation of recycled concrete, and improves production efficiency.

[0064] The above describes an embodiment of this specific implementation method, but this embodiment is not limited to the above specific implementation method. The above specific implementation method is merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. A process for preparing recycled concrete, characterized in that: The steps include: S1, collecting waste concrete blocks, removing impurities on the waste concrete blocks, and spraying the waste concrete blocks; S2, crushing the collected waste concrete blocks using a concrete crusher; S3, cleaning the crushed waste concrete particles, removing impurities attached to the surface and performing dehydration treatment; S4. Screening the dehydrated waste concrete particles, selecting particles with a particle size of 4-10 mm as recycled coarse aggregate, and particles with a particle size of 0.16-4 mm as recycled fine aggregate; S5. Put the recycled coarse aggregate, recycled fine aggregate, cement, fly ash and silica fume into a mixer, stir and mix them to obtain recycled concrete.

2. A recycled concrete preparation device, applied to a recycled concrete preparation process according to claim 1, characterized in that: include: A concrete crusher, comprising a crushing bin with a feed inlet and a discharge outlet; Wherein, a material distribution bin is installed on the discharge port, and a screening bin is installed on the material distribution bin; A switching mechanism includes a motor installed on the screening bin, and a gear is installed on the output shaft of the motor, two sets of rack plates are meshed and connected to the gear, and a connecting frame is provided on the side of the rack plate away from the gear, a delay mechanism is provided between the rack plate and the connecting frame, a screening frame is installed on the connecting frame, and multiple sets of electromagnets are evenly distributed inside the screening frame.

3. The recycled concrete preparation equipment according to claim 2, characterized in that: The electromagnets are arranged in a columnar structure, and the electromagnets in the columnar structure are evenly distributed in the screening frame, and can adsorb iron slag in concrete fragments in all directions.

4. The recycled concrete preparation equipment according to claim 2, characterized in that: A limiting groove adapted to the screening frame is provided inside the screening material bin, and the screening frame and the limiting groove are slidably connected.

5. The recycled concrete preparation equipment according to claim 2, characterized in that: The delay mechanism includes a slide groove opened inside the connecting frame, and a slider is slidably connected inside the slide groove, the slider is fixedly connected to the rack plate, a first spring is installed on the slider, and the end of the first spring away from the slider is fixedly connected to the slide groove, and openings adapted to the rack plate are opened on the two groups of connecting frames.

6. The recycled concrete preparation equipment according to claim 5, characterized in that: A fixed frame is installed on the screening bin, and a movable column is slidably connected inside the fixed frame. A sliding frame is installed on the movable column, and a clamping block is installed on the sliding frame. A second spring is provided on the movable column, and both ends of the second spring are fixedly connected to the fixed frame and the sliding frame respectively.

7. The recycled concrete preparation equipment according to claim 6, characterized in that: A limiting block is installed at one end of the connecting frame away from the opening. A clamping slot is provided on the limiting block, and the shape of the clamping slot matches that of the clamping block.

8. The recycled concrete preparation equipment according to claim 7, characterized in that: The side of the limiting block away from the connecting frame is inclined, and the side of the clamping block close to the connecting frame is also inclined.

9. The recycled concrete preparation equipment according to claim 2, characterized in that: A distribution mechanism is provided inside the distribution bin, which is used to disperse and evenly distribute the crushed concrete fragments so that the concrete fragments can enter the screening bin more evenly. The distribution mechanism includes a distribution plate arranged inside the distribution bin, and a plurality of through openings are opened on the distribution plate. Connecting shafts are symmetrically installed on the distribution plate, and the connecting shafts are rotatably connected to the distribution bin through bearings. The inner sides of the distribution bin are arranged in an arc-shaped structure.

10. The recycled concrete preparation equipment according to claim 9, characterized in that: One group of the connecting shafts has an end away from the cloth plate and is equipped with a swing arm through the cloth bin, and a traction groove is provided inside the swing arm. The bearing on the cloth bin is connected to a shaft, and a turntable is installed on the shaft, and an eccentric shaft is installed on the turntable. The traction groove and the eccentric shaft are slidably connected.

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