Sandstone separating mechanism for concrete mixing station and waste concrete recycling method

Abstract

The application relates to a sand-stone separating mechanism for a concrete mixing station and a waste concrete recycling method, and belongs to the technical field of resource recycling of the concrete mixing station. The sand-stone separating mechanism for the concrete mixing station comprises a separating cylinder, a screening net, a vibrating assembly and a crushing assembly. The screening net is movably arranged in the separating cylinder. The vibrating assembly is arranged on the separating cylinder and is used for driving the screening net to vibrate. The crushing assembly is arranged on the screening net and is used for dispersing sand-stone lumps on the screening net. The application has the advantages that the sand-stone separating effect is guaranteed.

Description

Technical Field

[0001] This application relates to the field of resource recycling technology for concrete mixing plants, and in particular to a sand and gravel separation mechanism for concrete mixing plants and a method for recycling waste concrete. Background Technology

[0002] During the production process of concrete mixing plants, scrap concrete and wastewater containing concrete residue are usually generated. In order to reduce environmental pollution, the scrap concrete and wastewater containing concrete residue need to be recycled through sand and gravel separation.

[0003] Currently, vibrating screens are mainly used for sand and gravel separation. However, some highly viscous sand and gravel clumps in the waste material are still not easily dispersed under the vibration of the vibrating screen, resulting in poor sand and gravel separation effect. Summary of the Invention

[0004] To help ensure effective sand and gravel separation, this application provides a sand and gravel separation mechanism for concrete mixing plants and a method for recycling waste concrete.

[0005] Firstly, the sand and gravel separation mechanism for a concrete mixing plant provided in this application adopts the following technical solution: A sand and gravel separation mechanism for a concrete mixing plant, comprising: Separation cylinder; A screening screen, which is movably disposed inside a separation cylinder; A vibration assembly, which is mounted on the separation cylinder, is used to drive the screening screen to vibrate; A crushing component is disposed on a screening screen to disperse sand and gravel clumps on the screening screen.

[0006] Preferably, the crushing assembly includes a crushing blade and a dispersing probe. The crushing blade is disposed on the screening screen with its cutting edge facing upward, and the dispersing probe is disposed on the crushing blade and extends upward.

[0007] Preferably, a rotating column is rotatably mounted on the screening screen, the rotation axis of the rotating column is parallel to the axis of the separation cylinder, the crushing blade is mounted on the rotating column, and a transmission assembly is provided inside the separation cylinder to drive the rotating column to rotate when the screening screen vibrates.

[0008] Preferably, the transmission assembly includes a transmission ring, a first abutment block, a second abutment block, a first abutment post, and a second abutment post. The transmission ring and the rotating post are concentrically arranged. The end of the crushing blade away from the rotating post is connected to the transmission ring. Multiple first abutment blocks are disposed on the transmission ring and distributed circumferentially along the transmission ring. Multiple second abutment blocks are disposed on the transmission ring and distributed circumferentially along the transmission ring. The first and second abutment blocks are located on opposite sides of the transmission ring. Each abutting block and the first abutting block are aligned and correspond one-to-one. Both the first abutting block and the second abutting block have three-dimensional curved surfaces. The first abutting post corresponds one-to-one with the first abutting block. Multiple first abutting posts are arranged on the separation cylinder along the circumference of the transmission ring. The first abutting post is used to abut against the three-dimensional curved surface on the first abutting block. The second abutting post corresponds one-to-one with the second abutting block. Multiple second abutting posts are arranged on the separation cylinder along the circumference of the transmission ring. The second abutting post is used to abut against the three-dimensional curved surface on the second abutting block. Multiple first abutting posts and second abutting posts are arranged alternately.

[0009] Preferably, the inner wall of the separating cylinder is provided with an annular groove, the transmission ring extends into the annular groove, and the first abutting block, the second abutting block, the first abutting post and the second abutting post are all located in the annular groove.

[0010] Preferably, the transmission ring includes a ring plate, a connecting plate, and a ring body. The ring plate abuts against the inner wall of the separation cylinder, the ring body is located in an annular groove, the connecting plate is disposed between the ring plate and the ring body, and the first abutting block and the second abutting block are both disposed on the ring body.

[0011] Preferably, the crushing blades are distributed at intervals along the circumference of the rotating column.

[0012] Preferably, the vibration assembly includes a drive motor, a cam, and an elastic element. The drive motor is mounted on the separation cylinder, the cam is coaxially connected to the output shaft of the drive motor, the cam abuts against the bottom wall of the screening screen, and the elastic element is disposed between the inner wall of the separation cylinder and the screening screen. The elastic element is used to pull the screening screen toward the direction closer to the cam for resetting.

[0013] Preferably, multiple screening screens are distributed along the height direction of the separation cylinder, the vibration components correspond one-to-one with the screening screens, and the bottom of the separation cylinder is connected to a mortar water output pipe.

[0014] Secondly, this application provides a method for recycling waste concrete, which adopts the following technical solution: A method for recycling waste concrete, using the aforementioned sand and gravel separation mechanism for concrete mixing plants, includes the following steps: Waste concrete material is fed into the separation cylinder; The waste concrete material on the screening screen is screened by the vibrating component, and the sand and gravel lumps on the screening screen are dispersed by the crushing component to obtain gravel, coarse sand and mortar water respectively. Gravel and coarse sand are transported to their respective stockpiles via belt conveyors, while mortar water enters the centrifuge through pipelines. The mortar water is dehydrated by a centrifuge to separate slurry water and mortar, and the slurry water is recycled. The mortar is dried to obtain sand particles, which are then conveyed to the corresponding stockpile by a conveyor.

[0015] In summary, this application includes the following beneficial technical effects: When sand and gravel separation is required, waste concrete material is fed into the screening screen through the opening at the top of the separation cylinder. The screening screen is driven to vibrate by the vibration component, so that large-diameter stones remain on the screening screen and small-diameter coarse sand passes through the screening screen, thereby separating the dispersed sand and gravel. At the same time, the crushing component disperses the highly viscous sand and gravel clumps in the waste concrete material, which helps to ensure the sand and gravel separation effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0017] Figure 2 This is a cross-sectional view of the overall structure of the separation cylinder in an embodiment of this application.

[0018] Figure 3 yes Figure 2 Enlarged view of section A.

[0019] Figure 4 This is a partial exploded view of an embodiment of this application, mainly used to show the relative position of the annular groove.

[0020] Figure 5 This is a partial structural schematic diagram of the transmission ring in an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Separation cylinder; 2. Screening mesh; 3. Crushing assembly; 31. Crushing blade; 32. Dispersion probe; 4. Rotating column; 5. Transmission ring; 51. Ring plate; 52. Connecting plate; 53. Ring body; 6. First abutting block; 7. Second abutting block; 8. First abutting column; 9. Second abutting column; 10. Three-dimensional curved surface; 11. Annular groove; 12. Drive motor; 13. Cam; 14. Elastic element; 15. Mortar water output pipe; 16. Stone discharge end; 17. Coarse sand discharge end; 18. Fixing block; 19. Telescopic rod. Detailed Implementation

[0022] The following combination Figures 1-5 This application will be described in further detail.

[0023] This application discloses a sand and gravel separation mechanism for a concrete mixing plant. (Refer to...) Figure 1 and Figure 2 The sand and gravel separation mechanism for a concrete mixing plant includes a separation cylinder 1, a screening screen 2, a vibration assembly, and a crushing assembly 3. The separation cylinder 1 is an open-top cylinder with a circular cross-section. The screening screen 2 is inclined and movable inside the separation cylinder 1. Specifically, the inclination angle of the screening screen 2 is less than 10°, and the screening screen 2 is slidably installed in the separation cylinder 1 in a vertical direction. The vibration assembly is installed on the separation cylinder 1, and the vibrator is used to drive the screening screen 2 to vibrate in order to separate the sand and gravel. The crushing assembly 3 is installed on the screening screen 2 and is used to disperse the sand and gravel clumps on the screening screen 2.

[0024] When sand and gravel separation is required, waste concrete material is fed into the screening screen 2 through the opening at the top of the separation cylinder 1. The screening screen 2 is driven to vibrate up and down by the vibration component, so that large-diameter stones remain on the screening screen 2 and small-diameter coarse sand passes through the screening screen 2, thereby separating the dispersed sand and gravel. At the same time, the crushing component 3 disperses the highly viscous sand and gravel clumps in the waste concrete material, which helps to ensure the sand and gravel separation effect.

[0025] Reference Figure 1 and Figure 2 To facilitate the separate collection of gravel, coarse sand, and mortar water, multiple screening screens 2 are spaced apart along the height direction inside the separation cylinder 1. A vibration component corresponds one-to-one with each screening screen 2. Specifically, there are two screening screens 2, with the upper screening screen 2 having a larger aperture than the lower screening screen 2. Furthermore, the separation cylinder 1 has a gravel discharge end 16 and a coarse sand discharge end 17. The gravel discharge end 16 is aligned with the inclined lower end of the upper screening screen 2, and the coarse sand discharge end 17 is aligned with the inclined lower end of the lower screening screen 2, thus facilitating the separate transport of the gravel and coarse sand to their respective material piles. A mortar water output pipe 15 is connected to the bottom of the separation cylinder 1. The mortar water in the concrete wastewater, after separation by the screening screens 2, enters the subsequent dewatering stage through the mortar water output pipe 15 at the bottom of the separation cylinder 1.

[0026] Reference Figure 2 and Figure 3 To facilitate the guidance of the vibration of the screening screen 2, multiple fixing blocks 18 are distributed below each screening screen 2. The fixing blocks 18 are fixed on the inner wall of the separation cylinder 1. A telescopic rod 19 is fixed between the fixing block 18 and the corresponding screening screen 2. The extension and retraction direction of the telescopic rod 19 is parallel to the sliding direction of the screening screen 2. The vibration of the screening screen 2 is guided by the multiple telescopic rods 19.

[0027] Reference Figure 2 and Figure 3To achieve vibration of the screening screen 2, each vibration component includes a drive motor 12, a cam 13, and an elastic element 14. The drive motor 12 is fixedly mounted on the separation cylinder 1, and the output shaft of the drive motor 12 rotates through the separation cylinder 1. Each screening screen 2 corresponds to two drive motors 12. The cam 13 corresponds one-to-one with the drive motor 12. The cam 13 is coaxially fixed on the output shaft of the corresponding drive motor 12. The outer wall of the cam 13 abuts against the bottom wall of the corresponding screening screen 2. The elastic element 14 is disposed between the inner wall of the separation cylinder 1 and the screening screen 2. The elastic element 14 is used to pull the screening screen 2 toward the direction closer to the cam 13 for reset.

[0028] Reference Figure 2 and Figure 3 To facilitate the repositioning of the screening screen 2 towards the cam 13, the elastic element 14 includes a spring. Each spring corresponds to a telescopic rod 19, with the spring movably sleeved on the corresponding telescopic rod 19. One end of the spring is connected to the fixing block 18, and the other end is fixed to the bottom wall of the corresponding screening screen 2. In other embodiments, the elastic element 14 can be replaced with an elastic rope, an arc-shaped spring sheet, or other similar structures.

[0029] When the vibrating screen 2 is required, the drive motor 12 is started. The drive motor 12 drives the cam 13 to rotate synchronously. During the rotation, the long side of the cam 13 lifts the screen 2. When the short side of the cam 13 abuts against the screen 2, the screen 2 moves downward to reset under the action of the corresponding spring, thereby realizing the up-and-down reciprocating vibration of the screen 2, which helps to separate sand and gravel.

[0030] Reference Figure 2 and Figure 4 Furthermore, the crushing component 3 can be set alone on the upper screening screen 2 to separate highly viscous sand and gravel clumps, or it can be set on both screening screens 2. In this embodiment, since only gravel and coarse sand are needed, the crushing component 3 is set only on the upper screening screen 2. However, when it is necessary to obtain more sand particles of different degrees, the crushing component 3 can be set on each screening screen 2.

[0031] Reference Figure 2 and Figure 4 To facilitate the dispersion of highly viscous sand and gravel lumps, a rotating column 4 is centrally located on the screening screen 2. The crushing assembly 3 includes crushing blades 31 and dispersing probes 32. The crushing blades 31 are fixed on the rotating column 4 with their cutting edges facing upwards. The dispersing probes 32 are fixed on the upper edge of the crushing blades 31 and extend upwards. To improve the crushing effect of the sand and gravel lumps, multiple crushing blades 31 are fixed along the circumference of the rotating column 4, and multiple dispersing probes 32 are arranged along the length of the corresponding crushing blades 31.

[0032] When waste concrete falls onto the screening screen 2, it is crushed to a certain extent by the crushing blades 31 and the vertical dispersing probes 32. At the same time, as the screening screen 2 drives the concrete waste to vibrate up and down, the highly viscous sand and gravel clumps are easily dispersed and crushed further by the crushing blades 31 and the dispersing probes 32 as they fall downwards, thereby achieving the dispersion of highly viscous sand and gravel clumps and helping to ensure the sand and gravel separation effect.

[0033] Reference Figure 2 and Figure 4 The rotating column 4 is rotatably mounted on the screening screen 2. The rotation axis of the rotating column 4 is parallel to the axis of the separation cylinder 1. The separation cylinder 1 is equipped with a transmission component for driving the rotating column 4 to rotate when the screening screen 2 vibrates.

[0034] Reference Figure 2 , Figure 4 and Figure 5 Specifically, to facilitate the rotation of the rotating column 4 when the screening screen 2 vibrates, an annular groove 11 is provided on the inner wall of the separation cylinder 1. The annular groove 11 is located above the upper screening screen 2. The transmission assembly includes a transmission ring 5, a first abutting block 6, a second abutting block 7, a first abutting column 8, and a second abutting column 9. The transmission ring 5 is concentrically arranged with the rotating column 4, so that the transmission ring 5 is coaxially arranged with the separation cylinder 1. Multiple crushing blades 31 are located inside the transmission ring 5. The end of the crushing blade 31 away from the rotating column 4 is fixedly connected to the transmission ring 5, so that the rotation of the transmission ring 5 can drive the movement of the crushing blades 31.

[0035] Reference Figure 4 and Figure 5 Specifically, to make the structure less susceptible to the influence of sand and gravel, the transmission ring 5 includes a ring plate 51, a connecting plate 52, and a ring body 53. The ring plate 51 abuts against the inner wall of the separation cylinder 1, and the ring body 53 is located in the annular groove 11. The cross-section of the ring body 53 is T-shaped. The connecting plate 52 is fixed between the ring plate 51 and the ring body 53. The width of the opening of the annular groove 11 is greater than the thickness of the connecting plate 52, so that the entire transmission ring 5 can move up and down. The width of the connecting plate 52 is greater than the width of the opening of the annular groove 11, so that the annular groove 11 can be covered to prevent sand and gravel from entering the annular groove 11.

[0036] Reference Figure 4 and Figure 5Multiple first abutment blocks 6 are fixedly spaced along the circumference of the ring body 53, and multiple second abutment blocks 7 are also fixedly spaced along the circumference of the ring body 53. The first abutment blocks 6 and second abutment blocks 7 correspond one-to-one and are aligned vertically. The first abutment blocks 6 and second abutment blocks 7 are located on opposite sides of the ring body 53. Specifically, the first abutment blocks 6 are located above the ring body 53, and the second abutment blocks 7 are located below the ring body 53. Both the first abutment blocks 6 and second abutment blocks 7 are arc-shaped blocks, and both abutment blocks 6 and second abutment blocks 7 are aligned with the ring body. 53 Concentric; the sides of the first abutting block 6 and the second abutting block 7 that are far apart from each other at the same end both have three-dimensional curved surfaces 10. The three-dimensional curved surfaces 10 are similar to the curved surfaces on turbine blades. The distance from the three-dimensional curved surface 10 on the first abutting block 6 to the ring body 53 and the distance from the three-dimensional curved surface 10 on the second abutting block 7 to the ring body 53 decrease in the same direction. The three-dimensional curved surfaces 10 on the multiple first abutting blocks 6 are all set in the same circumferential direction, and the three-dimensional curved surfaces 10 on the multiple second abutting blocks 7 are also all set in the same circumferential direction.

[0037] Reference Figure 4 and Figure 5 Multiple first abutment posts 8 are provided, each corresponding to a first abutment block 6. The multiple first abutment posts 8 are fixed on the upper wall of the annular groove 11 along the circumference of the ring body 53. The first abutment posts 8 are used to abut against the three-dimensional curved surface 10 on the first abutment block 6. Similarly, multiple second abutment posts 9 are provided, each corresponding to a second abutment block 7. The multiple second abutment posts 9 are fixed on the lower wall of the annular groove 11 along the circumference of the ring body 53. The second abutment posts 9 are used to abut against the three-dimensional curved surface 10 on the second abutment block 7. The multiple first abutment posts 8 and multiple second abutment posts 9 are staggered. The ends of the first abutment posts 8 and the second abutment posts 9 are designed to be arc-shaped to facilitate relative sliding with the three-dimensional curved surface 10.

[0038] Reference Figure 4 and Figure 5 The vertical distance between the first abutting post 8 and the second abutting post 9 at their closest points is equal to the distance from the upper side of the first abutting block 6 to the lower side of the second abutting block 7. When the short side of the cam 13 abuts against the bottom wall of the screening mesh 2, the second abutting block 7 is located between adjacent second abutting posts 9, and the first abutting post 8 is located directly above the first abutting block 6 and aligned with it. At this time, the vertical distance between the first abutting post 8 and the first abutting block 6 is equal to the thickness of the second abutting block 7. When the long side of the cam 13 abuts against the bottom wall of the screening mesh 2, the first abutting block 6 is located between two adjacent first abutting posts 8, and the second abutting block 7 is located directly above the second abutting post 9 and aligned with it. Since the ring body 53 is located within the annular groove 11, the first abutting block 6, the second abutting block 7, the first abutting post 8, and the second abutting post 9 are all located within the annular groove 11, making them less susceptible to the influence of sand and gravel screening.

[0039] When the screening screen 2 is in its initial state, the short side of the cam 13 abuts against the bottom wall of the screening screen 2. During screening, the drive motor 12 drives the cam 13 to start rotating. As the cam 13 rotates, it lifts the screening screen 2, causing the screening screen 2 to move vertically upward through the rotating column 4 and the crushing blade 31, bringing the first abutting block 6 close to the first abutting post 8. Then, the second abutting block 7 moves out from between the second abutting posts 9. As the screening screen 2 continues to move upward, the first abutting post 8 abuts against the three-dimensional curved surface 10 of the first abutting block 6. Thus, the first abutting post 8 exerts a vertical force on the three-dimensional curved surface 10, similar to the force acting on a spiral blade. The ring 53 will rotate at a certain angle, causing the first abutting block 6 to move between two adjacent first abutting posts 8. At this time, the second abutting block 7 moves out from between the two adjacent first abutting posts 8. The connecting block 7 is aligned with the second abutting post 9 below, and the long side of the cam 13 abuts against the screening screen 2. Then, as the cam 13 rotates, the screening screen 2 drives the transmission ring 5 to move vertically downward. The first abutting block 6 moves out from between two adjacent first abutting posts 8. Then, the three-dimensional curved surface 10 of the second abutting block 7 abuts against the second abutting post 9. As the screening screen 2 continues to move downward, the second abutting post 9 will apply a vertical force to the three-dimensional curved surface 10, driving the ring body 53 to continue to rotate in the same direction by a certain angle, so that the second abutting block 7 is located between adjacent second abutting posts 9, and the first abutting post 8 is located directly above the first abutting block 6. This process is repeated to achieve intermittent rotation of the ring body 53, thereby continuously changing the position of the crushing blade 31, expanding the crushing range, and further improving the dispersion effect of sand and gravel clumps.

[0040] The implementation principle of this application embodiment is as follows: When sand and gravel separation is required, waste concrete material is fed into the upper screen 2 through the upper opening of the separation cylinder 1. The waste concrete material is crushed to a certain extent by passing through the crushing blade 31 and the vertical dispersing probe 32. Then, the drive motor 12 is started, and the drive motor 12 drives the cam 13 to rotate. The cam 13 lifts and lowers the screen 2, thereby realizing the up and down vibration of the screen 2. Large-diameter stones are left on the upper screen 2 and then discharged from the stone discharge end 16. Small-diameter coarse sand falls through the upper screen 2 to the lower screen 2 and is then discharged from the coarse sand discharge end 17. Then, mortar water falls through the lower screen 2 to the bottom wall of the separation cylinder 1 and is discharged from the mortar water output pipe 15, thereby separating the dispersed sand and gravel.

[0041] Through the cooperation of the first abutting block 6 and the first abutting column 8, and the cooperation of the second abutting block 7 and the second abutting column 9, the transmission ring 5 and the rotating column 4 can be intermittently rotated during the up-and-down vibration of the screening screen 2. This allows the position of the crushing blade 31 on the screening screen 2 to be continuously changed. During the process of highly viscous sand and gravel clumps being shaken up and falling, they are easily dispersed and crushed under the action of the crushing blade 31 and the dispersing probe 32, thus helping to ensure the sand and gravel separation effect.

[0042] This application also discloses a method for recycling waste concrete. The waste concrete recycling method utilizes the aforementioned sand and gravel separation mechanism for concrete mixing plants and includes the following steps: Step 1: The waste concrete material is fed into the separation cylinder 1, and the sand and gravel lumps are initially dispersed by the crushing blades 31 and dispersing probes 32 on the upper screen 2; Step 2: Next, start the drive motor 12 corresponding to the upper and lower screening screens 2. The drive motor 12 drives the cam 13 to rotate, and the cam 13 drives the corresponding screening screen 2 to vibrate up and down, screening the waste concrete material on the screening screen 2. During the up and down vibration of the upper screening screen 2, the rotating column 4 is rotated intermittently through the transmission component, thereby continuously changing the position of the crushing blade 31. During the process of the highly viscous sand and gravel clumps being shaken up and falling, they are dispersed under the action of the crushing blade 31 and the dispersing probe 32, respectively obtaining gravel, coarse sand and mortar water. Step 3: The gravel and coarse sand are transported to their respective stockpiles by belt conveyors, and the mortar water enters the centrifuge through pipes; Step 4: The mortar water is dehydrated by a centrifuge to separate the slurry water and mortar, and the slurry water is recycled. Step 5: The mortar is dried to obtain sand particles, which are then conveyed to the corresponding stockpile by a conveyor.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sand-stone separating mechanism for a concrete mixing plant, characterized by, include: Separation cylinder (1); Screening mesh (2), which is movably disposed inside the separation cylinder (1); A vibration assembly is disposed on the separation cylinder (1) and is used to drive the screening screen (2) to vibrate; A crushing component (3) is disposed on a screening screen (2) for dispersing sand and gravel clumps on the screening screen (2). The crushing component (3) includes a crushing blade (31) and a dispersing probe (32). The crushing blade (31) is disposed on the screening screen (2) with the blade facing upward. The dispersing probe (32) is disposed on the crushing blade (31) and extends upward. A rotating column (4) is rotatably mounted on the screening screen (2). The rotation axis of the rotating column (4) is parallel to the axis of the separation cylinder (1). The crushing blade (31) is mounted on the rotating column (4). A transmission assembly is provided inside the separation cylinder (1) to drive the rotating column (4) to rotate when the screening screen (2) vibrates. The transmission assembly includes a transmission ring (5), a first abutment block (6), a second abutment block (7), a first abutment post (8), and a second abutment post (9). The transmission ring (5) and the rotating post (4) are concentrically arranged. The end of the crushing blade (31) away from the rotating post (4) is connected to the transmission ring (5). The first abutment block (6) is disposed on the transmission ring (5), and multiple first abutment blocks (6) are distributed along the circumference of the transmission ring (5). The second abutment block (7) is disposed on the transmission ring (5), and multiple second abutment blocks (7) are distributed along the circumference of the transmission ring (5). The first abutment block (6) and the second abutment block (7) are located on opposite sides of the transmission ring (5). One-to-one correspondence and alignment, the first abutment block (6) and the second abutment block (7) both have three-dimensional curved surfaces (10), the first abutment post (8) corresponds one-to-one with the first abutment block (6), a plurality of first abutment posts (8) are arranged on the separation cylinder (1) along the circumference of the transmission ring (5), the first abutment post (8) is used to abut the three-dimensional curved surface (10) on the first abutment block (6), the second abutment post (9) corresponds one-to-one with the second abutment block (7), a plurality of second abutment posts (9) are arranged on the separation cylinder (1) along the circumference of the transmission ring (5), the second abutment post (9) is used to abut the three-dimensional curved surface (10) on the second abutment block (7), and a plurality of first abutment posts (8) and second abutment posts (9) are arranged alternately.

2. The sand and gravel separation mechanism for a concrete mixing plant according to claim 1, characterized in that: The inner wall of the separation cylinder (1) is provided with an annular groove (11), the transmission ring (5) extends into the annular groove (11), and the first abutting block (6), the second abutting block (7), the first abutting post (8) and the second abutting post (9) are all located in the annular groove (11).

3. The sand and gravel separation mechanism for a concrete mixing plant according to claim 2, characterized in that: The transmission ring (5) includes a ring plate (51), a connecting plate (52) and a ring body (53). The ring plate (51) abuts against the inner wall of the separation cylinder (1). The ring body (53) is located in the annular groove (11). The connecting plate (52) is disposed between the ring plate (51) and the ring body (53). The first abutting block (6) and the second abutting block (7) are both disposed on the ring body (53).

4. The sand and gravel separation mechanism for a concrete mixing plant according to claim 1, characterized in that: The crushing blades (31) are distributed in multiple intervals along the circumference of the rotating column (4).

5. The sand and gravel separation mechanism for a concrete mixing plant according to claim 1, characterized in that: The vibration assembly includes a drive motor (12), a cam (13), and an elastic element (14). The drive motor (12) is mounted on the separation cylinder (1). The cam (13) is coaxially connected to the output shaft of the drive motor (12). The cam (13) abuts against the bottom wall of the screening screen (2). The elastic element (14) is disposed between the inner wall of the separation cylinder (1) and the screening screen (2). The elastic element (14) is used to pull the screening screen (2) to move toward the cam (13) for resetting.

6. The sand and gravel separation mechanism for a concrete mixing plant according to claim 1, characterized in that: Multiple screening screens (2) are distributed along the height direction of the separation cylinder (1). The vibration components correspond one-to-one with the screening screens (2). The bottom of the separation cylinder (1) is connected to a mortar water output pipe (15).

7. A method for recycling waste concrete, using the sand and gravel separation mechanism for a concrete mixing plant as described in any one of claims 1-6, characterized in that, Includes the following steps: Waste concrete material is fed into the separator (1); The waste concrete material on the screening screen (2) is screened by the vibration component, and the sand and gravel lumps on the screening screen (2) are dispersed by the crushing component (3) to obtain gravel, coarse sand and mortar water respectively; Gravel and coarse sand are transported to their respective stockpiles via belt conveyors, while mortar water enters the centrifuge through pipelines. The mortar water is dehydrated by a centrifuge to separate slurry water and mortar, and the slurry water is recycled. The mortar is dried to obtain sand particles, which are then conveyed to the corresponding stockpile by a conveyor.

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