Screening system for waste materials in concrete gravel aggregate

Abstract

The invention relates to the technical field of building material processing and treatment, in particular to a screening system for waste in concrete gravel aggregate, which comprises a rack connected with a conveying material belt; the two rotating rings are coaxially arranged, the rotating rings are rotationally connected with the rack, and a mounting space is reserved between the two rotating rings; a plurality of arc-shaped grooves are coaxially formed in the rotating ring, the two ends of the screening rods extend into the arc-shaped grooves, the screening rods are connected with the rotating ring in a sliding mode, a waste containing cavity is defined by the multiple screening rods, and the screening rods are located above the upper belt face of the conveying material belt; the multiple interval adjusting units are connected with the rotating ring, and the interval adjusting units are connected with the screening rods and used for changing the width of a passing seam between every two adjacent screening rods; the device has the effect of removing the large-particle-size gravel waste from the gravel aggregate with the low screening cost and the high screening efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of building material processing, and in particular to a waste screening system in concrete sand and gravel aggregates. Background Art

[0002] Sand and gravel aggregate is a general term for materials such as sand, pebbles, crushed stone, blocks, and rubble stones used in water conservancy projects. It is also the most widely used, indispensable, and irreplaceable basic material in the construction of infrastructure projects such as buildings, roads, and bridges. Specifically, sand and gravel aggregate plays a role as a skeleton and filler in concrete, which can stabilize the volume and transmit stress.

[0003] In the process of producing or processing sand and gravel aggregates, some aggregates have a larger particle size and need to be discarded. The prior art discloses a sand and gravel aggregate waste grading and screening device, which includes a frame, a grading tank body and a plurality of screening plates. The grading tank body is welded and fixed on the frame, and the grading tank body is hollow. The plurality of screening plates are distributed along the height direction. The screening plate is obliquely connected to the grading tank body, and the through-hole sizes on the plurality of screening plates gradually decrease from top to bottom. A discharge hole is opened on the side wall of the grading tank body, and the discharge hole corresponds to the lower end position of the screening plate. A vibration motor is connected to the screening plate, and the sand and gravel aggregate enters the grading area from the feed port at the upper end of the grading tank body. Under the action of its own gravity and the vibration of the vibration motor, the sand and gravel aggregate rolls down on the plurality of screening plates and is screened accordingly, and the grading and screening of large, medium and small particle sizes of sand and gravel aggregates are completed in sequence.

[0004] With regard to the above-mentioned related technologies, when screening large-size waste materials in sand and gravel aggregates, all sand and gravel aggregates need to be poured into the grading area through the feed port at the upper end of the grading tank for vibration screening, and then the large-size sand and gravel aggregate waste materials that have been graded are removed. However, the proportion of large-size waste materials in sand and gravel aggregates is small, and the efficiency of this screening method is low. In addition, all sand and gravel aggregates are graded and screened, and the screening cost of the waste materials is high. Summary of the invention

[0005] In order to remove large-size sand and gravel waste from sand and gravel aggregates with lower screening cost and higher screening efficiency, the present application provides a waste screening system in concrete sand and gravel aggregates.

[0006] The waste screening system in concrete sand and gravel aggregate provided in this application adopts the following technical solution: A waste screening system in concrete sand and gravel aggregates, comprising: A frame, to which a conveyor belt is connected; Two coaxially arranged rotating rings, the rotating rings are rotatably connected to the frame, and an installation space is reserved between the two rotating rings; A plurality of screening rods, a plurality of arc grooves are coaxially opened on the rotating ring, both ends of the screening rods extend into the arc grooves, and the screening rods are slidably connected with the rotating ring, and the plurality of screening rods surround a waste cavity, and the screening rods are located above the upper belt surface of the conveyor belt; A plurality of spacing adjustment units are connected to the rotating ring and the spacing adjustment units are connected to the screening rods, and are used to change the width of the running gap between two adjacent screening rods.

[0007] By adopting the above technical solution, the two ends of the conveyor belt are placed at the unscreened sand and gravel aggregate and the sand and gravel aggregate use place respectively. At this time, the sand and gravel aggregate moves forward on the conveyor belt. During the movement of the conveyor belt, the sand and gravel aggregate is gradually flattened by the vibration until the sand and gravel aggregate moves to the rotating ring. Since the large-sized waste in the sand and gravel aggregate has a large diameter, when the rotating ring rotates, the large-sized waste will be stuck in the gap between two adjacent screening rods and then enter the waste cavity. After the large-sized waste is screened by the rotating ring and the screening rod for many times, the sand and gravel aggregate moves to the sand and gravel aggregate use or storage place. After a period of screening, the large-sized waste in the waste cavity can be taken out through the cavity of the rotating ring on one side. The designed waste screening system in concrete sand and gravel aggregate can facilitate the installation of the conveyor belt through the frame, and the position transfer of the sand and gravel aggregate can be achieved through the conveyor belt. The large-size waste can be put into the waste cavity by rolling through the cooperation of the rotating ring and the screening rod, thereby realizing the screening and removal of the large-size waste, and there is no need to additionally pour the sand and gravel aggregate into a special screening device for screening operation, which also reduces the ineffective contact between the sand and gravel aggregate and the screening structure, and prolongs the service life of the screening structure. The large-size sand and gravel waste can be removed from the sand and gravel aggregate with lower screening cost and higher screening efficiency. The spacing between two adjacent screening rods can be changed through the spacing adjustment unit, so that the large-size waste can enter the waste cavity.

[0008] In a specific embodiment, it further comprises two driving material pouring units, wherein the driving material pouring units are connected to the frame and the driving material pouring units are connected to the rotating ring, and are used to drive the two rotating rings to move closer to or away from each other, and the screening rod comprises Two sliding blocks, the sliding blocks are slidably connected in the arc groove, and the sliding blocks are connected to the spacing adjustment unit; An articulated block, both ends of which are rotatably connected with screening segments, the screening segment is rotatably connected to the sliding block at one end away from the articulated block, and when the two screening segments are in the same straight line, the side of the screening segment close to the axis of the rotating ring abuts against the limiting area on the articulated block.

[0009] By adopting the above technical scheme, after the large-size waste in the waste holding cavity accumulates to a certain amount, the unloading unit is driven to apply force to the rotating ring, and the two rotating rings approach each other. While the rotating rings approach each other, they drive the sliding block to move, so that the hinge block moves toward one side of the axis of the rotating ring. At this time, a discharge structure with a high middle and low sides is formed in the waste holding cavity, so that the large-size waste falls from an opening on one side of the rotating ring under the action of its own gravity, and the large-size waste is automatically discharged; the designed screening rod can form a discharge structure with a high middle and low ends inside the waste holding cavity through the cooperation of the sliding block, the hinge block and the screening section, so that the large-size waste is automatically discharged from the opening on one side of the rotating ring from the waste holding cavity under the action of its own gravity.

[0010] In a specific implementation manner, the driving and unloading unit comprises: A connecting frame, the connecting frame is connected to the rotating ring, and a discharging gap is formed on the connecting frame; A mounting block, the mounting block is slidably connected to the frame, and the mounting block slides axially along the rotating ring; A driving motor, wherein the driving motor is connected to the mounting block, and an output shaft of the driving motor is connected to the connecting frame; An adjusting cylinder is connected to the frame, and a piston rod of the adjusting cylinder is connected to the sliding block.

[0011] By adopting the above technical solution, a driving unloading unit is designed. By adjusting the cylinder, the sliding block can be driven to slide toward or away from the conveyor belt. The driving motor can be installed through the mounting block. The driving motor can drive the connecting frame to rotate. The connecting frame can transmit the torque of the driving motor while leaving a discharge gap for large particle size waste.

[0012] In a specific possible implementation mode, charging barrels are detachably connected to both sides of the frame, the top wall of the charging barrel is provided with an opening, and the rotating ring is located directly above the opening of the top wall of the charging barrel.

[0013] By adopting the above technical solution, the designed charging barrel can collect the large-size waste discharged from the waste cavity.

[0014] In a specific feasible implementation scheme, the spacing adjustment unit includes two return springs, the return springs are located in the arc groove, the two return springs are respectively located on opposite sides of the sliding block, and one end of the return spring is connected to the sliding block, and the other end is connected to the rotating ring.

[0015] By adopting the above technical solution, the spacing adjustment unit is designed. Through the reset spring, the sliding block can slide in the arc groove and thus change the gap between two adjacent screening sections. At the same time, the position of the sliding block can be reset, thereby reducing the possibility of large-size waste already in the waste cavity falling back onto the conveyor belt.

[0016] In a specific possible implementation scheme, at least one flattening rod is connected to the frame, and the flattening rod is located above the upper belt surface of the conveyor belt. A material passing gap is left between the flattening rod and the upper belt surface of the conveyor belt, and the flattening rod is at the front end of the conveyor belt relative to the rotating ring.

[0017] By adopting the above technical solution, the designed leveling rod can achieve the leveling of the sand and gravel aggregates when the sand and gravel aggregates on the conveyor belt pass through, thereby avoiding the accumulation of sand and gravel aggregates on the conveyor belt and causing screening errors of the screening structure.

[0018] In a specific possible implementation manner, the distance between the tiling rod and the axis of the rotating ring gradually increases from both ends of the tiling rod to the middle.

[0019] By adopting the above technical solution, the sand and gravel waste with particularly large particle size in the sand and gravel aggregate can be removed first.

[0020] In a specific possible implementation mode, the tiling rod is slidably connected to the frame, and the sliding direction of the tiling rod is vertically arranged, an adjusting screw is threadedly connected to the frame, and the adjusting screw is rotatably connected to the tiling rod.

[0021] By adopting the above technical solution, the designed adjusting screw can change the height of the material gap between the flattening rod and the conveyor belt, and then adjust the rejection threshold of large particle size waste according to the rejection rate of large particle size waste and the screening rate of large particle size waste in the waste cavity.

[0022] In a specific possible implementation manner, a support roller is rotatably connected to the frame, the support roller is rollingly connected to the conveyor belt, and the axis of the support roller and the axis of the rotating ring are in the same vertical plane.

[0023] By adopting the above technical solution, the designed support roller can facilitate the support of the upper belt surface of the conveyor belt at the screening point of the screening rod, thereby facilitating large-size waste to pass through the gap between two adjacent screening rods and enter the waste cavity.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The designed waste screening system in concrete sand and gravel aggregate is convenient to install the conveyor belt through the frame, the position transfer of sand and gravel aggregate can be realized through the conveyor belt, and large-size waste can be put into the waste cavity by rolling through the cooperation of the rotating ring and the screening rod, so as to realize the screening and removal of large-size waste, and there is no need to pour the sand and gravel aggregate into a special screening device for screening operation, which also reduces the ineffective contact between the sand and gravel aggregate and the screening structure, prolongs the service life of the screening structure, and removes large-size sand and gravel waste from the sand and gravel aggregate with lower screening cost and higher screening efficiency. The spacing between two adjacent screening rods can be changed through the spacing adjustment unit, so that large-size waste can enter the waste cavity.

[0025] 2. The designed waste screening system in concrete sand and gravel aggregate can form a discharge structure with a high middle and low ends inside the waste cavity through the cooperation of sliding blocks, hinged blocks and screening sections, so that large-size waste can be discharged from the waste cavity from the opening on one side of the rotating ring under the action of its own gravity.

[0026] 3. The designed waste screening system in concrete sand and gravel aggregate can realize the position reset of the sliding block while sliding the sliding block in the arc groove and changing the gap between two adjacent screening sections through the reset spring, thereby reducing the possibility of large-size waste already in the waste cavity falling back onto the conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a waste screening system in concrete sand and gravel aggregate according to an embodiment of the present application.

[0028] Figure 2 yes Figure 1 A cross-sectional view parallel to the conveying direction of the conveyor belt.

[0029] Figure 3 yes Figure 2 Schematic diagram of some structures in .

[0030] Figure 4 yes Figure 1 A cross-sectional view taken along a direction perpendicular to the conveying direction of the conveyor belt.

[0031] Figure 5 is Figure 4 Schematic diagram of the three-dimensional structure after adding a charging barrel to the foundation.

[0032] Figure 6 is Figure 5 Schematic diagram of the three-dimensional structure after adding flattening rods and adjusting screws to the foundation.

[0033] Explanation of the accompanying drawings: 1. Frame; 11. Support roller; 2. Conveyor belt; 3. Rotating ring; 31. Arc groove; 4. Screening rod; 41. Sliding block; 42. Articulated block; 43. Screening section; 5. Spacing adjustment unit; 51. Return spring; 6. Driving unloading unit; 61. Connecting frame; 62. Mounting block; 63. Driving motor; 64. Adjusting cylinder; 7. Charging barrel; 8. Flattening rod; 9. Adjusting screw. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-6 This application is described in further detail.

[0035] The embodiment of the present application discloses a waste screening system in concrete sand and gravel aggregates.

[0036] Reference Figure 1 A waste screening system for concrete sand and gravel aggregates includes a frame 1 and a conveyor belt 2, the conveyor belt 2 is installed on the frame 1, and the upper belt surface of the conveyor belt 2 is horizontally arranged, and the position transfer of the sand and gravel aggregate is realized by relying on the conveyor belt 2, such as transferring the sand and gravel aggregate from the silo to the mixing hopper. In this process, in order to remove large-size waste in the sand and gravel aggregate and improve the quality of the later concrete, the waste screening system for concrete sand and gravel aggregates also includes two rotating rings 3 and multiple screening rods 4, the rotating ring 3 is rotatably connected to the frame 1, and the rotating axis of the rotating ring 3 is horizontally arranged and perpendicular to the conveying direction of the conveyor belt 2, an installation space is reserved between the two rotating rings 3, a plurality of arc grooves 31 are coaxially opened on the rotating ring 3, both ends of the screening rod 4 extend into the arc groove 31, and the screening rod 4 is slidably connected to the rotating ring 3, the plurality of screening rods 4 surround a waste cavity, and the waste cavity is connected to the outside through the openings of the rotating ring 3 on both sides, and the screening rod 4 is located above the upper belt surface of the conveyor belt 2.

[0037] Reference Figure 2 Furthermore, a support roller 11 is rotatably connected to the frame 1, and the support roller 11 is rollingly connected to the conveyor belt 2, and the axis of the support roller 11 and the axis of the rotating ring 3 are in the same vertical plane. The support roller 11 can facilitate the support of the upper surface of the conveyor belt 2 at the screening point of the screening rod 4, thereby facilitating large-size waste to pass through the gap between two adjacent screening rods 4 and enter the waste cavity.

[0038] Reference Figure 3 In order to adjust the distance between two adjacent screening bars 4 so that large-sized waste can enter the waste containing cavity and reduce the possibility of large-sized waste falling back onto the conveyor belt 2, the waste screening system in concrete sand and gravel aggregate also includes a plurality of spacing adjustment units 5, which are connected to the rotating ring 3 and the spacing adjustment units 5 are connected to the screening bars 4, and are used to change the width of the travel gap between two adjacent screening bars 4.

[0039] Reference Figure 3 Specifically, the spacing adjustment unit 5 includes two return springs 51, which are located in the arc groove 31, and the two return springs 51 are respectively located on opposite sides of the screening rod 4, one end of the return spring 51 abuts against the screening rod 4, and the other end abuts against the rotating ring 3. The return spring 51 can be used to realize the sliding of the screening rod 4 in the arc groove 31 and thus change the gap between the two adjacent screening rods 4. At the same time, the position of the screening rod 4 can be reset, thereby reducing the possibility of large-size waste already in the waste cavity falling back onto the conveyor belt 2.

[0040] Reference Figure 4 Specifically, the screening rod 4 includes a sliding block 41, a hinge block 42 and a screening segment 43. The number of the sliding block 41 and the screening segment 43 are both two. The two sliding blocks 41 are respectively slidably connected to the arc grooves 31 opened on the two rotating rings 3, and the sliding block 41 abuts against the return spring 51. The two ends of the hinge block 42 are hinged to the two screening segments 43, and the end of the screening segment 43 away from the hinge block 42 is rotatably connected to the sliding block 41. The two ends of the hinge block 42 protrude to form a limited position area, and the limited position area is set on the side of the hinge block 42 close to the axis of the rotating ring 3. When the two screening segments 43 are on the same straight line, the side of the screening segment 43 close to the axis of the rotating ring 3 abuts against the limited position area on the hinge block 42, so that the screening segment 43 can only rotate toward one side of the axis of the rotating ring 3.

[0041] Reference Figure 4 and Figure 5 Specifically, the waste screening system in concrete sand and gravel aggregate also includes two driving discharging units 6, which are connected to the frame 1 and the driving discharging unit 6 is connected to the rotating ring 3, and is used to drive the two rotating rings 3 to approach or move away from each other; after the large-size waste in the waste cavity accumulates to a certain amount, the driving discharging unit 6 applies force to the rotating ring 3, and the two rotating rings 3 approach each other. When the rotating rings 3 approach each other, the sliding block 41 is driven to move, so that the hinge block 42 moves toward one side of the axis of the rotating ring 3, and at this time, a discharge structure with a high middle and low sides is formed in the waste cavity, so that the large-size waste falls from the opening on one side of the rotating ring 3 under the action of its own gravity, and the large-size waste is automatically discharged; the designed screening rod 4, through the cooperation of the sliding block 41, the hinge block 42 and the screening section 43, can form a discharge structure with a high middle and low ends inside the waste cavity, so that the large-size waste is discharged from the opening on one side of the rotating ring 3 from the waste cavity under the action of its own gravity.

[0042] Reference Figure 4 and Figure 5Specifically, the driving unloading unit 6 includes a connecting frame 61, a mounting block 62, a driving motor 63 and an adjusting cylinder 64. The connecting frame 61 is welded and fixed to the rotating ring 3, and a plurality of discharging gaps are formed on the connecting frame 61. The mounting block 62 is slidably connected to the frame 1, and the mounting block 62 slides horizontally along the axial direction of the rotating ring 3. The driving motor 63 is bolted to the mounting block 62, and the output shaft of the driving motor 63 is connected to the connecting frame 61 through a coupling. The adjusting cylinder 64 is bolted to the frame 1, and the piston rod of the adjusting cylinder 64 is connected to the mounting block 62, and the axial direction of the piston rod of the adjusting cylinder 64 is consistent with the axial direction of the driving motor 63.

[0043] Reference Figure 5 In order to facilitate the collection of large-sized waste discharged from the waste cavity, the two sides of the frame 1 are detachably fixedly connected with a loading bucket 7 by bolts. The top wall of the loading bucket 7 is opened, and the rotating ring 3 is located in the area directly above the opening of the top wall of the loading bucket 7 to ensure that the large-sized waste in the waste cavity can fall into the loading bucket 7 more accurately.

[0044] Reference Figure 6 In order to flatten the sand and gravel aggregates on the conveyor belt 2 so that the sand and gravel aggregates can be spread flat on the conveyor belt 2 during the conveying process, and to facilitate the screening structure composed of the rotating ring 3 and multiple screening rods 4 to efficiently screen the sand and gravel aggregates, at least one spreading rod 8 is connected to the frame 1, and the spreading rod 8 is located above the conveyor belt 2, and there is a material passing gap between the spreading rod 8 and the upper belt surface of the conveyor belt 2, and the spreading rod 8 is at the front end of the conveying direction of the conveyor belt 2 relative to the rotating ring 3.

[0045] Reference Figure 6 Furthermore, the distance between the flattening rod 8 and the axis of the rotating ring 3 gradually increases from the two ends of the flattening rod 8 to the middle, so that the sand and gravel waste with particularly large particle size in the sand and gravel aggregate can be removed first. In the present application, the flattening rod 8 can be in an arc shape or a broken line shape, as long as it can discharge the large particle size waste from the conveyor belt 2; the sand and gravel aggregate can be scraped flat when passing through the conveyor belt 2, so as to avoid the accumulation of sand and gravel aggregate on the conveyor belt 2 and cause screening errors of the screening structure.

[0046] Reference Figure 6 Specifically, the flattening rod 8 is slidably connected to the frame 1, and the sliding direction of the flattening rod 8 is vertically set. An adjusting screw 9 is threadedly connected to the frame 1, and the adjusting screw 9 is rotatably connected to the flattening rod 8; the height of the material passing gap between the flattening rod 8 and the conveyor belt 2 can be changed by adjusting the screw 9, and then the rejection threshold of large-size waste can be adjusted according to the rejection rate of large-size waste and the screening rate of large-size waste in the waste cavity.

[0047] The implementation principle of a waste screening system in concrete sand and gravel aggregate in the embodiment of the present application is as follows: the two ends of the conveyor belt 2 are respectively placed at the unscreened sand and gravel aggregate and the sand and gravel aggregate use place, at this time, the sand and gravel aggregate moves forward on the conveyor belt 2, and the sand and gravel aggregate is gradually flattened due to the vibration during the movement of the conveyor belt 2 until the sand and gravel aggregate moves to the rotating ring 3. Since the large-sized waste in the sand and gravel aggregate has a large diameter, when the rotating ring 3 rotates, the large-sized waste will be stuck in the gap between the two adjacent screening rods 4 and then enter the waste cavity. After the large-sized waste is screened by the rotating ring 3 and the screening rod 4 for many times, the sand and gravel aggregate moves to the use or storage place of the sand and gravel aggregate. After a period of screening, when the large-sized waste in the waste cavity accumulates to a certain amount, the unloading unit 6 is driven to apply force to the rotating ring 3, and the two rotating rings 3 approach each other. When the rotating rings 3 approach each other, the sliding block 41 is driven to move, so that The hinge block 42 moves toward one side of the axis of the rotating ring 3. At this time, a discharge structure with a high middle and low sides is formed in the waste cavity, so that large-sized waste falls from an opening on one side of the rotating ring 3 under the action of its own gravity, thereby completing the automatic discharge of large-sized waste. The frame 1 is convenient for installing the conveyor belt 2, and the position transfer of sand and gravel aggregates can be achieved through the conveyor belt 2. The large-sized waste can be brought into the waste cavity by rolling through the cooperation of the rotating ring 3 and the screening rod 4, thereby achieving the screening and removal of large-sized waste. There is no need to additionally pour the sand and gravel aggregate into a special screening device for screening operation, which also reduces the ineffective contact between the sand and gravel aggregate and the screening structure, prolongs the service life of the screening structure, and removes large-sized sand and gravel waste from the sand and gravel aggregate with lower screening cost and higher screening efficiency. The spacing between two adjacent screening rods 4 can be changed by the spacing adjustment unit 5, thereby facilitating the large-sized waste to enter the waste cavity.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A waste screening system for concrete sand and gravel aggregates, characterized by: include: A frame (1), wherein a conveyor belt (2) is connected to the frame (1); Two coaxially arranged rotating rings (3), the rotating rings (3) being rotatably connected to the frame (1), and an installation space being reserved between the two rotating rings (3); A plurality of screening rods (4), a plurality of arc grooves (31) are coaxially formed on the rotating ring (3), both ends of the screening rods (4) extend into the arc grooves (31), and the screening rods (4) are slidably connected to the rotating ring (3), and the plurality of screening rods (4) enclose a waste containing cavity, and the screening rods (4) are located above the upper belt surface of the conveyor belt (2); A plurality of spacing adjustment units (5), wherein the spacing adjustment units (5) are connected to the rotating ring (3), and the spacing adjustment units (5) are connected to the screening rods (4), and are used to change the width of the running gap between two adjacent screening rods (4).

2. The waste screening system in concrete sand and gravel aggregate according to claim 1 is characterized by: It also includes two driving material pouring units (6), the driving material pouring units (6) are connected to the frame (1), and the driving material pouring units (6) are connected to the rotating ring (3), and are used to drive the two rotating rings (3) to move closer to each other or away from each other, and the screening rod (4) includes Two sliding blocks (41), the sliding blocks (41) are slidably connected in the arc-shaped groove (31), and the sliding blocks (41) are connected to the spacing adjustment unit (5); An articulated block (42), both ends of the articulated block (42) are rotatably connected with screening segments (43), one end of the screening segment (43) away from the articulated block (42) is rotatably connected to the sliding block (41), and when the two screening segments (43) are in the same straight line, the side of the screening segment (43) close to the axis of the rotating ring (3) abuts against the limiting area on the articulated block (42).

3. The waste screening system in concrete sand and gravel aggregate according to claim 2 is characterized by: The driving unloading unit (6) comprises: A connecting frame (61), the connecting frame (61) is connected to the rotating ring (3), and a discharge gap is formed on the connecting frame (61); A mounting block (62), the mounting block (62) being slidably connected to the frame (1), and the mounting block (62) slidingly slides along the axial direction of the rotating ring (3); A driving motor (63), wherein the driving motor (63) is connected to the mounting block (62), and an output shaft of the driving motor (63) is connected to the connecting frame (61); An adjusting cylinder (64), wherein the adjusting cylinder (64) is connected to the frame (1), and a piston rod of the adjusting cylinder (64) is connected to the sliding block (41).

4. The waste screening system in concrete sand and gravel aggregate according to claim 2 is characterized by: The two sides of the frame (1) are detachably connected with a charging barrel (7), the top wall of the charging barrel (7) is provided with an opening, and the rotating ring (3) is located directly above the opening of the top wall of the charging barrel (7).

5. The waste screening system in concrete sand and gravel aggregate according to claim 2 is characterized by: The spacing adjustment unit (5) comprises two return springs (51), wherein the return springs (51) are located in the arc groove (31), and the two return springs (51) are respectively located on opposite sides of the sliding block (41), and one end of the return spring (51) is connected to the sliding block (41), and the other end is connected to the rotating ring (3).

6. The waste screening system in concrete sand and gravel aggregate according to claim 1 is characterized by: At least one flattening rod (8) is connected to the frame (1), and the flattening rod (8) is located above the upper belt surface of the conveyor belt (2). A material passing gap is left between the flattening rod (8) and the upper belt surface of the conveyor belt (2), and the flattening rod (8) is located at the front end of the conveyor belt (2) relative to the rotating ring (3).

7. The waste screening system in concrete sand and gravel aggregate according to claim 6 is characterized by: The distance between the flattening rod (8) and the axis of the rotating ring (3) gradually increases from the two ends of the flattening rod (8) to the middle.

8. The waste screening system in concrete sand and gravel aggregate according to claim 6 is characterized by: The paving rod (8) is slidably connected to the frame (1), and the sliding direction of the paving rod (8) is vertically arranged; an adjusting screw (9) is threadedly connected to the frame (1), and the adjusting screw (9) is rotatably connected to the paving rod (8).

9. The waste screening system in concrete sand and gravel aggregate according to any one of claims 1 to 8, characterized in that: A support roller (11) is rotatably connected to the frame (1), the support roller (11) is rollingly connected to the conveyor belt (2), and the axis of the support roller (11) and the axis of the rotating ring (3) are in the same vertical plane.

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