Bulk rock screening device for earthwork backfill

Abstract

The utility model provides a big stone screening device for earthwork backfilling, including screening cylinder, the top fixedly connected with feed hopper of screening cylinder, the top of screening cylinder is opened with feed inlet, feed inlet is linked with feed hopper, the bottom of screening cylinder is the open state, the bottom fixedly connected with the receiving frame of screening cylinder, the inside of screening cylinder is provided with screening subassembly, screening subassembly includes the fixed cylinder of fixedly connected in the top wall below of screening cylinder middle part, forms the unloading screening area between fixed cylinder outer wall and screening cylinder inner wall, the fixed cylinder bottom opening is fixedly connected with the outlet cylinder of penetrating to the below of receiving frame. Through the spiral blade that sets up, can make big stone in screening cylinder along spiral path movement, has increased the contact area and time of stone and screening hole, has reduced the jamming phenomenon in the screening process of stone, can realize screening grain size adjustment and screening process through the control first servo motor and second servo motor.

Description

Technical Field

[0001] This utility model relates to the technical field of stone screening equipment, specifically a large stone screening device for earthwork backfilling. Background Technology

[0002] In earthwork backfilling projects, the particle size of large stones is closely related to the backfill density and load-bearing capacity, and their screening quality directly determines the backfilling effect and project quality. Most existing large stone screening devices employ a mechanical structure of fixed screens combined with gravity screening or simple vibrating screening. When these devices operate, the material moves on the fixed screen solely by its own gravity or slight vibration. The short contact time and limited contact area between the stones and the screen result in low screening efficiency. Furthermore, because the fixed screen structure cannot flexibly adjust the screening particle size according to actual project requirements, when the project's requirements for the large stone particle size change, the screen must be replaced, which is not only cumbersome to operate but also increases construction and time costs. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a large stone screening device for earthwork backfilling to solve the problems mentioned in the background. This invention has a novel structure. Through the spiral blades, large stones can move along a spiral path inside the screening cylinder, increasing the contact area and time between the stones and the screening holes, improving screening efficiency, and reducing clogging during the screening process. The screening particle size can be adjusted and the screening process can be controlled by controlling the first servo motor and the second servo motor.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a large stone screening device for earthwork backfilling, comprising a screening cylinder, a feeding hopper fixedly connected to the top of the screening cylinder, a feeding port opened at the top of the screening cylinder and connected to the feeding hopper, an open bottom of the screening cylinder, a receiving frame fixedly connected to the bottom of the screening cylinder, a screening assembly inside the screening cylinder, the screening assembly including a fixed cylinder fixedly connected to the bottom of the top wall of the middle section of the screening cylinder, a discharge screening section formed between the outer wall of the fixed cylinder and the inner wall of the screening cylinder, and a discharge cylinder extending through to the bottom opening of the fixed cylinder and below the receiving frame.

[0005] Furthermore, the inner wall of the feeding hopper is fixedly connected to a feeding plate that is inclined toward the top feeding port of the screening cylinder, the bottom wall of the receiving frame is provided with a through groove extending downwards, and the outer wall of the discharge cylinder is fixedly connected to the inner wall of the through groove.

[0006] Furthermore, a fixing plate is fixedly connected to the outer wall of the screening cylinder, and a through groove is provided through the inner wall of the screening cylinder extending outward.

[0007] Furthermore, the inner wall of the screening cylinder is rotatably fitted with helical blades, and the inner side of the helical blades is in contact with the outer wall of the fixed cylinder.

[0008] Furthermore, a first servo motor is fixedly connected to the top of the screening cylinder, an adjusting cylinder is rotatably fitted to the inner wall of the fixed cylinder, and a through hole is provided through the top of the fixed cylinder downwards.

[0009] Furthermore, the output shaft of the first servo motor is fixedly connected to a connecting shaft, which is rotatably fitted in a through hole, and one end of the connecting shaft is fixedly connected to the top of the adjusting cylinder.

[0010] Furthermore, the fixed cylinder has multiple first screening holes arranged in a circular pattern around its periphery, and the adjusting cylinder has multiple second screening holes arranged in a circular pattern around its periphery, with the first screening holes and the second screening holes cooperating with each other.

[0011] Furthermore, the inner wall of the screening cylinder is provided with an annular groove, and a rotating ring that is rotatably engaged in the annular groove is fixedly connected to the bottom of the spiral blade. A second servo motor is fixedly installed on the upper side of the fixed plate, and a first gear located in the through groove is fixedly connected to the output shaft of the second servo motor. A second gear that meshes with the first gear is fixedly connected to the circumference of the rotating ring.

[0012] The beneficial effects of this utility model are: 1. This large stone screening device for earthwork backfilling uses spiral blades to enable large stones to move along a spiral path inside the screening cylinder, increasing the contact area and time between the stones and the screening holes, improving screening efficiency, and reducing clogging of stones during the screening process. The screening particle size can be adjusted and the screening process can be controlled by controlling the first servo motor and the second servo motor.

[0013] 2. The large stone screening device for earthwork backfilling uses a first servo motor to drive the adjusting cylinder to rotate, which can flexibly adjust the degree of overlap between the first screening hole and the second screening hole, thereby achieving precise control of the screening particle size and meeting the diverse needs of different earthwork backfilling projects for large stone particle size. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the large stone screening device for earthwork backfilling according to this utility model; Figure 2 This is a side sectional view of the sieve cylinder of this utility model. Figure 3 This is a schematic diagram of the connection between the fixed cylinder and the adjusting cylinder of this utility model; Figure 4 This is a schematic diagram of the screening component of this utility model.

[0015] In the diagram: 1. Screening cylinder; 2. Feed hopper; 3. Feed inlet; 4. Receiving frame; 5. Discharge cylinder; 6. Screening assembly; 601. Fixed cylinder; 602. Spiral blade; 603. First servo motor; 604. Adjusting cylinder; 605. Through hole; 606. Connecting shaft; 607. First screening hole; 608. Second screening hole; 609. Annular groove; 610. Rotating ring; 611. Second servo motor; 612. First gear; 613. Second gear; 7. Discharge screening section; 8. Discharge plate; 9. Through groove; 10. Fixed plate; 11. Through groove. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] Please refer to Figures 1 to 4 This utility model provides a technical solution: a large stone screening device for earthwork backfilling, including a screening cylinder 1, a feeding hopper 2 fixedly connected to the top of the screening cylinder 1, a feeding port 3 opened at the top of the screening cylinder 1, the feeding port 3 communicating with the feeding hopper 2, the bottom of the screening cylinder 1 being open, a receiving frame 4 fixedly connected to the bottom of the screening cylinder 1, a screening component 6 provided inside the screening cylinder 1, the screening component 6 including a fixed cylinder 601 fixedly connected to the lower part of the top wall in the middle of the screening cylinder 1, a discharge screening section 7 formed between the outer wall of the fixed cylinder 601 and the inner wall of the screening cylinder 1, and a discharge cylinder 5 fixedly connected to the bottom opening of the fixed cylinder 601, extending through to the lower part of the receiving frame 4.

[0018] In this embodiment, the inner wall of the feeding hopper 2 is fixedly connected to a feeding plate 8 that is inclined toward the top feeding port 3 of the screening cylinder 1. The bottom wall of the receiving frame 4 is provided with a through groove 9 extending downwards. The outer wall of the discharge cylinder 5 is fixedly connected to the inner wall of the through groove 9. The outer wall of the screening cylinder 1 is fixedly connected to a fixing plate 10. The inner wall of the screening cylinder 1 is provided with a through groove 11 extending outwards. The inner wall of the screening cylinder 1 is rotatably fitted with a spiral blade 602. The inner side of the spiral blade 602 is in contact with the outer wall of the fixing cylinder 601.

[0019] Specifically, large stones are poured into the feed hopper 2. The feed plate 8 on the inner wall of the feed hopper 2 is inclined toward the feed inlet 3 at the top of the screening cylinder 1, which can guide the large stones to enter the screening cylinder 1 smoothly. The rotating ring 610 drives the spiral blade 602 to rotate on the inner wall of the screening cylinder 1. The inner side of the spiral blade 602 is in contact with the outer wall of the fixed cylinder 601, which can push the large stones to move downward along the spiral path in the screening cylinder 1. Large stones that do not pass the screening will continue to move downward along the spiral blade 602 and finally be discharged from the screening device through the discharge cylinder 5. The through groove 9 on the bottom wall of the receiving frame 4 is connected to the discharge cylinder 5 to facilitate the collection of the screened stones.

[0020] In this embodiment, a first servo motor 603 is fixedly connected to the top of the screening cylinder 1. An adjusting cylinder 604 is rotatably fitted to the inner wall of the fixed cylinder 601. A through hole 605 is provided through the top of the fixed cylinder 601. A connecting shaft 606 is fixedly connected to the output shaft of the first servo motor 603. The connecting shaft 606 is rotatably fitted inside the through hole 605, and one end of it is fixedly connected to the top of the adjusting cylinder 604. A plurality of first screening holes 607 are arranged circumferentially around the fixed cylinder 601. A plurality of first screening holes 607 are arranged circumferentially around the adjusting cylinder 604. The sieve cylinder 1 has multiple second screening holes 608, and the first screening hole 607 cooperates with the second screening hole 608. The inner wall of the sieve cylinder 1 has an annular groove 609. The bottom of the spiral blade 602 is fixedly connected to a rotating ring 610 that is rotatably engaged in the annular groove 609. The upper side of the fixed plate 10 is fixedly installed with a second servo motor 611. The output shaft of the second servo motor 611 is fixedly connected to a first gear 612 located in the through groove 11. The circumference of the rotating ring 610 is fixedly connected to a second gear 613 that meshes with the first gear 612.

[0021] Specifically, the second servo motor 611 starts, and its output shaft drives the first gear 612 to rotate. The first gear 612 meshes with the second gear 613 on the side of the rotating ring 610, thereby driving the rotating ring 610 to rotate. The rotating ring 610 drives the spiral blades 602 to rotate on the inner wall of the screening cylinder 1. The inner side of the spiral blades 602 is in contact with the outer wall of the fixed cylinder 601, which can push large stones to move downward along the spiral path in the screening cylinder 1. During the movement, stones that meet the particle size requirements will fall into the receiving frame 4 through the screening channel formed by the cooperation of the first screening hole 607 and the second screening hole 608, completing the preliminary screening. If it is necessary to adjust the screening particle size, the first servo motor 603 can be started, and its output shaft drives the connecting shaft 606 to rotate. The connecting shaft 606 drives the adjusting cylinder 604 to rotate on the inner wall of the fixed cylinder 601. By rotating the adjusting cylinder 604, the degree of overlap between the first screening hole 607 and the second screening hole 608 is changed, thereby realizing the adjustment of the screening particle size.

[0022] When using the device to screen large stones, the material is first poured into the feed hopper 2. Guided by the inclined discharge plate 8 on the inner wall of the feed hopper 2, the large stones enter the screening cylinder 1 through the feed inlet 3 at the top of the screening cylinder 1 and fall into the discharge screening section 7 between the outer wall of the fixed cylinder 601 and the inner wall of the screening cylinder 1. Then, the second servo motor 611 is started, and its output shaft drives the first gear 612 to rotate. Through meshing with the second gear 613 on the circumference of the rotating ring 610, the rotating ring 610 drives the spiral blades 602 to rotate on the inner wall of the screening cylinder 1, pushing the large stones down along the spiral path. During this process, stones that meet the particle size requirements fall into the receiving frame 4 through the channel formed by the first screening hole 607 and the second screening hole 608 to complete the initial screening. If it is necessary to adjust the screening particle size, the first servo motor 603 is started, and its output shaft drives the adjusting cylinder 604 to rotate on the inner wall of the fixed cylinder 601 through the connecting shaft 606, changing the degree of overlap of the two screening holes. Large stones that do not pass the screening continue to move down along the spiral blades 602 and are discharged from the device through the discharge cylinder 5. The groove 9 on the bottom wall of the receiving frame 4 is connected to the discharge cylinder 5 to facilitate the collection of the screened stones.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A large stone screening device for earthwork backfilling, comprising a screening cylinder (1), characterized in that: The top of the screening cylinder (1) is fixedly connected to a feed hopper (2), and the top of the screening cylinder (1) is provided with a feed inlet (3). The feed inlet (3) is connected to the feed hopper (2). The bottom of the screening cylinder (1) is open. The bottom of the screening cylinder (1) is fixedly connected to a receiving frame (4). The screening cylinder (1) is provided with a screening component (6). The screening component (6) includes a fixed cylinder (601) fixedly connected to the bottom of the top wall of the middle part of the screening cylinder (1). The outer wall of the fixed cylinder (601) and the inner wall of the screening cylinder (1) form a feeding screening section (7). The bottom opening of the fixed cylinder (601) is fixedly connected to a discharge cylinder (5) that extends to the bottom of the receiving frame (4).

2. The large stone screening device for earthwork backfilling according to claim 1, characterized in that: The inner wall of the feed hopper (2) is fixedly connected to a feed plate (8) that is inclined toward the feed inlet (3) at the top of the screening cylinder (1). The bottom wall of the receiving frame (4) is provided with a through groove (9) extending downwards. The outer wall of the discharge cylinder (5) is fixedly connected to the inner wall of the through groove (9).

3. The large stone screening device for earthwork backfilling according to claim 2, characterized in that: The outer wall of the screening cylinder (1) is fixedly connected to a fixing plate (10), and the inner wall of the screening cylinder (1) is provided with a through groove (11) extending outward.

4. The large stone screening device for earthwork backfilling according to claim 3, characterized in that: The inner wall of the screening cylinder (1) is fitted with a spiral blade (602), and the inner side of the spiral blade (602) is in contact with the outer wall of the fixed cylinder (601).

5. The large stone screening device for earthwork backfilling according to claim 4, characterized in that: The top of the screening cylinder (1) is fixedly connected to a first servo motor (603), the inner wall of the fixed cylinder (601) is rotatably fitted with an adjusting cylinder (604), and the top of the fixed cylinder (601) is provided with a through hole (605) extending downwards.

6. The large stone screening device for earthwork backfilling according to claim 5, characterized in that: The output shaft of the first servo motor (603) is fixedly connected to a connecting shaft (606), which is rotatably fitted in a through hole (605), and one end of which is fixedly connected to the top of the adjusting cylinder (604).

7. The large stone screening device for earthwork backfilling according to claim 6, characterized in that: The fixed cylinder (601) has a plurality of first screening holes (607) arranged in a circular pattern on its periphery, and the adjusting cylinder (604) has a plurality of second screening holes (608) arranged in a circular pattern on its periphery, with the first screening holes (607) and the second screening holes (608) cooperating with each other.

8. The large stone screening device for earthwork backfilling according to claim 7, characterized in that: The inner wall of the screening cylinder (1) is provided with an annular groove (609). The bottom of the spiral blade (602) is fixedly connected to a rotating ring (610) that is rotatably engaged in the annular groove (609). A second servo motor (611) is fixedly installed on the upper side of the fixed plate (10). The output shaft of the second servo motor (611) is fixedly connected to a first gear (612) located in the through groove (11). The circumference of the rotating ring (610) is fixedly connected to a second gear (613) that meshes with the first gear (612).

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