Concrete screening device

Abstract

The invention belongs to the technical field of concrete screening, and particularly discloses a concrete screening device which comprises a bottom plate, a front supporting frame and a rear supporting frame are arranged on the upper wall of the bottom plate, connecting rods are symmetrically arranged on the inner side walls of the front supporting frame and the rear supporting frame, a triangular plate is fixedly arranged on each connecting rod, and a multi-stage screening assembly is arranged between the two triangular plates. The multi-stage screening assembly comprises a first-stage screening assembly, a second-stage screening assembly and a third-stage screening assembly, the first-stage screening assembly, the second-stage screening assembly and the third-stage screening assembly are sequentially arranged in a broken line shape from top to bottom, a rotary linkage assembly is arranged between the triangular plates and the multi-stage screening assembly, and power linkage assemblies are arranged on the upper portions of the two triangular plates. The first-stage screening assembly, the second-stage screening assembly and the third-stage screening assembly are arranged in a broken line shape from top to bottom, the rotary linkage assembly and the power linkage assembly are matched, multi-stage screening of concrete stone is achieved, meanwhile, the sliding speed of the concrete stone in the inner screening barrel is reduced, and the cleaning brush can prevent the inner screening barrel from being blocked.

Description

Technical Field

[0001] This invention belongs to the field of concrete screening technology, specifically referring to a concrete screening device. Background Technology

[0002] Due to their good hardness and stable chemical properties, sand and gravel are widely used as high-quality concrete raw materials in housing, roads, highways, railways, and other engineering fields. Before using sand and gravel, they need to be screened by a screening device to select sand and gravel of different particle sizes and to use suitable sand and gravel in construction.

[0003] Most existing sand and gravel screening devices have a screening cylinder installed at an angle on the frame. The material slides down by its own weight, and sand and gravel of the required particle size are automatically screened through the screening cylinder. The mesh size of the screening cylinder gradually increases from front to back. Coarse stone is screened out last as the screening cylinder rotates. During this screening process, the coarse stone always slides down the screening cylinder, which is prone to clogging, thus affecting the screening of fine stone. When the stone slides down the inner screening cylinder at a high speed, the residence time of the stone in the inner screening cylinder is short, thus affecting the screening effect.

[0004] Therefore, a concrete screening device is needed to solve the above problems. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a concrete screening device, which has a first-stage, second-stage and third-stage screening components arranged in a zigzag shape from top to bottom, and works in conjunction with a rotary linkage component and a power linkage component to realize multi-stage screening of concrete aggregates. At the same time, it reduces the downward speed of concrete aggregates in the inner screening cylinder, and the cleaning brush can prevent the inner screening cylinder from clogging.

[0006] The technical solution adopted by this invention is as follows: This invention proposes a concrete screening device, including a base plate. A front support frame and a rear support frame are provided on the upper wall of the base plate. Connecting rods are symmetrically arranged on the inner sidewalls of the front and rear support frames. A triangular plate is fixed to each of the two connecting rods. A multi-stage screening assembly is provided between the two triangular plates. The multi-stage screening assembly includes a primary screening assembly, a secondary screening assembly, and a tertiary screening assembly. The primary, secondary, and tertiary screening assemblies have identical structures and are arranged in a zigzag pattern from top to bottom. The primary screening component and the secondary screening component are connected by a fixing frame one, the secondary screening component and the tertiary screening component are connected by a fixing frame two, the primary screening component is fixed to a triangular plate by a connecting frame, a rotation linkage component is provided between the triangular plate and the multi-stage screening component, a power linkage component is provided on the upper part of the two triangular plates, the primary screening component and the secondary screening component are connected by a bend pipe two, the secondary screening component and the tertiary screening component are connected by a bend pipe three, the primary screening component is provided with a bend pipe one, the upper end of the bend pipe one is connected to a hopper, and the tertiary screening component is provided with a bend pipe four.

[0007] Further, the primary (secondary, tertiary) screening assembly includes an outer cylinder, an inner screening cylinder, a cleaning brush, a connecting plate, a feeding pipe, a conical toothed disc, a connecting cylinder, a limiting strip, a connecting disc, a rotating ring, a pressure spring, a connecting pipe, a linkage block, a buffer spring, and a spiral groove. The lower end of the outer cylinder is a closed end, and its upper end is an open end, with the closed end inclined downwards. The connecting plate is located at the open end of the outer cylinder. The inner screening cylinder is located inside the outer cylinder. The connecting disc is located at the upper end of the inner screening cylinder. The upper end of the connecting pipe passes through the connecting plate and extends to its inner side. The lower end of the connecting pipe passes through the connecting disc and is inserted into the inner screening cylinder. The rotating ring is rotatably located on the inner end face of the connecting plate. The pressure spring is sleeved on the connecting pipe, and its two ends are respectively fixed to the end face of the rotating ring and the end face of the connecting disc. The outer cylinder has a spiral groove on its inner wall, and the connecting disc has a spring groove on its outer wall at the end away from the compression spring. The lower end of the buffer spring is fixed to the inner bottom wall of the spring groove. The lower end of the linkage block is slidably disposed in the spring groove and fixedly connected to the upper end of the buffer spring. The upper end of the linkage block is slidably engaged with the spiral groove. The upper end of the feeding pipe passes through the closed end face of the outer cylinder and is rotatably connected to that end face. The upper end of the connecting cylinder is fixed to the lower end of the inner screening cylinder. The lower end of the connecting cylinder is slidably disposed in the feeding pipe. The limiting strip is disposed on the outer wall of the connecting cylinder. The inner wall of the feeding pipe has a limiting groove. The limiting strip is slidably disposed in the limiting groove. The conical toothed disc is disposed on the feeding pipe near the closed end of the outer cylinder. The cleaning brush is disposed along the axis on the upper side of the inner wall of the outer cylinder.

[0008] Furthermore, one end of the second bend is located on the lower side of the outer wall of the closed end of the outer cylinder of the primary screening component, and the other end is located on the outer end face of the connecting plate of the secondary screening component and is connected to the connecting pipe of the secondary screening component.

[0009] Furthermore, one end of the bent pipe is located on the lower side of the outer wall of the closed end of the outer cylinder of the secondary screening component, and the other end is located on the outer end face of the connecting plate of the tertiary screening component and is connected to the connecting pipe of the tertiary screening component.

[0010] Furthermore, the lower end of the first bend penetrates the upper end face of the connecting plate of the first-stage screening component and is connected to the connecting pipe of the first-stage screening component.

[0011] Furthermore, the upper end of the fourth bend is located on the lower side of the outer wall of the closed end of the outer cylinder of the three-stage screening assembly.

[0012] Furthermore, the outer cylinder of the primary screening component is fixed to the triangular plate by a connecting frame.

[0013] Furthermore, the two ends of the spiral groove are smoothly connected to the inner wall of the outer cylinder.

[0014] Furthermore, the mesh size of the inner screening cylinders in the primary screening assembly, secondary screening assembly, and tertiary screening assembly increases sequentially.

[0015] Furthermore, the rotary linkage assembly includes pulley one, pulley two, pulley three, bevel gear one, bevel gear two, bevel gear three, rotating shaft one, rotating shaft two, rotating shaft three, and belt. Rotating shaft one, rotating shaft two, and rotating shaft three are respectively rotatably located at the three corners of the triangular plate. Pulley one is located on rotating shaft one, pulley two is located on rotating shaft two, and pulley three is located on rotating shaft three. The belt is located on pulley one, pulley two, and pulley three. Bevel gear one is located at the end of rotating shaft one, bevel gear two is located at the end of rotating shaft two, and bevel gear three is located at the end of rotating shaft three. Bevel gear one meshes with the bevel gear disc of the primary screening assembly, bevel gear two meshes with the bevel gear disc of the secondary screening assembly, and bevel gear three meshes with the bevel gear disc of the tertiary screening assembly.

[0016] Furthermore, the power linkage assembly includes a mounting bracket, a motor, a drive shaft, and a drive bevel gear. The mounting bracket is U-shaped, with both ends fixed to the outer side wall of the triangular plate. The drive shaft passes through the upper wall of the mounting bracket, the motor is located on the upper wall of the mounting bracket and connected to the upper end of the drive shaft, and the drive bevel gear is located at the lower end of the drive shaft.

[0017] The beneficial effects achieved by the present invention using the above structure are as follows: 1. The rotating linkage component is driven by the power linkage component, which drives the three inner screening cylinders to rotate synchronously. The stone material is gradually refined through the first, second and third screening components. It can accurately screen out sand and gravel of different coarse and fine particles, and avoid the coarse stone material from sliding down the screening cylinder during the screening process, which would affect the screening effect. 2. The inner wall of the screening cylinder of each screening component (first stage, second stage, and third stage) is equipped with a corresponding cleaning brush. During the screening process of the inner screening cylinder, the cleaning brush can clean the cylinder wall in real time to avoid the accumulation of coarse stone material and blockage of the screen holes, ensure smooth screening of fine stone material and improve screening efficiency. 3. The rotation of the inner screening cylinder drives the connecting plate and the linkage block to rotate synchronously. When the linkage block is in the spiral groove, the buffer spring pushes it to move along the groove trajectory, which drives the connecting plate, the inner screening cylinder, and the connecting cylinder to move slowly upward axially. After the linkage block leaves the spiral groove, it is compressed by the inner wall of the outer cylinder, and loses the trajectory restriction. The compression spring quickly pushes the connecting plate, the inner screening cylinder, and the connecting cylinder to move rapidly downward axially. This enables the inner screening cylinder to complete the axial reciprocating cycle of slow up and fast down as it rotates, which not only prolongs the residence time of the stone, but also disperses the material layer through rapid impact, ultimately achieving efficient and accurate multi-stage screening of the stone. 4. The primary, secondary, and tertiary screening components are arranged in a zigzag pattern, making the device more compact, reducing its floor space, and facilitating the addition of multiple screening stages. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a concrete screening device proposed in this invention; Figure 2 A schematic diagram showing the positional relationship between the rotary linkage component and the multi-stage screening component; Figure 3 A three-dimensional structural diagram of the primary screening component, the secondary screening component, and the tertiary screening component; Figure 4 This is a schematic diagram of the internal structure of the primary screening component, the secondary screening component, and the tertiary screening component; Figure 5 for Figure 4 The main view; Figure 6 This is a schematic diagram showing the location of the spiral grooves inside the outer cylinder; Figure 7 This is a three-dimensional structural diagram of the rotary linkage component; Figure 8 This is a three-dimensional structural diagram of the power linkage component; Figure 9 A three-dimensional structural diagram of the rotating ring, linkage block, and buffer spring; Figure 10 for Figure 4 Enlarged view of section A in the middle; Figure 11 for Figure 4 Enlarged view of section B.

[0019] The components include: 1. Base plate; 2. Front support frame; 3. Rear support frame; 4. Connecting rod; 5. Triangular plate; 6. Multi-stage screening assembly; 7. Primary screening assembly; 8. Secondary screening assembly; 9. Tertiary screening assembly; 10. Fixed frame one; 11. Fixed frame two; 12. Connecting frame; 13. Rotary linkage assembly; 14. Power linkage assembly; 15. Bend two; 16. Bend three; 17. Bend one; 18. Discharge hopper; 19. Bend four; 20. Outer cylinder; 21. Inner screening cylinder; 22. Cleaning brush; 23. Connecting plate; 24. Discharge pipe; 25. 26. Bevel gear disc, 27. Connecting cylinder, 28. Limiting strip, 29. Connecting disc, 30. Rotating ring, 31. Compression spring, 32. Connecting pipe, 33. Buffer spring, 34. Linkage block, 35. Spring groove, 36. Spiral groove, 37. Limiting groove, 38. Pulley 1, 39. Pulley 2, 40. Pulley 3, 41. Bevel gear 1, 42. Bevel gear 2, 43. Rotating shaft 1, 44. Rotating shaft 2, 45. Rotating shaft 3, 46. Belt, 47. Mounting bracket, 48. Motor, 49. Drive shaft, 50. Drive bevel gear.

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] like Figure 1 , Figure 2 and Figure 3As shown, this invention proposes a concrete screening device, including a base plate 1. The upper wall of the base plate 1 is provided with a front support frame 2 and a rear support frame 3. Connecting rods 4 are symmetrically arranged on the inner sidewalls of the front support frame 2 and the rear support frame 3. A triangular plate 5 is fixed to each of the two connecting rods 4. A multi-stage screening assembly 6 is provided between the two triangular plates 5. The multi-stage screening assembly 6 includes a primary screening assembly 7, a secondary screening assembly 8, and a tertiary screening assembly 9. The primary screening assembly 7, the secondary screening assembly 8, and the tertiary screening assembly 9 have identical structures and are arranged in a zigzag pattern from top to bottom. The primary screening assembly 7 and the secondary screening assembly 8 form a series of zigzag lines. The secondary screening component 8 is connected by a fixing frame 10. The secondary screening component 8 and the tertiary screening component 9 are connected by a fixing frame 2 11. The primary screening component 7 is fixed on the triangular plate 5 by a connecting frame 12. A rotation linkage component 13 is provided between the triangular plate 5 and the multi-stage screening component 6. A power linkage component 14 is provided on the upper part of the two triangular plates 5. The primary screening component 7 and the secondary screening component 8 are connected by a bend pipe 2 15. The secondary screening component 8 and the tertiary screening component 9 are connected by a bend pipe 3 16. The primary screening component 7 is provided with a bend pipe 17. The upper end of the bend pipe 17 is connected to a feed hopper 18. The tertiary screening component 9 is provided with a bend pipe 4 19.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 9 , Figure 10 and Figure 11As shown, the primary (secondary, tertiary) screening assembly 7 (8, 9) includes an outer cylinder 20, an inner screening cylinder 21, a cleaning brush 22, a connecting plate 23, a discharge pipe 24, a conical toothed disc 25, a connecting cylinder 26, a limiting strip 27, a connecting disc 28, a rotating ring 29, a compression spring 30, a connecting pipe 31, a linkage block 33, a buffer spring 32, and a spiral groove 35. The lower end of the outer cylinder 20 is a closed end, and its upper end is an open end. The closed end is inclined downwards. The connecting plate 23... The inner screening cylinder 21 is located inside the outer cylinder 20, with the inner screening cylinder 21 situated at the open end of the outer cylinder 20. The connecting disc 28 is located at the upper end of the inner screening cylinder 21. The upper end of the connecting pipe 31 penetrates the connecting plate 23 and extends to its inner side. The lower end of the connecting pipe 31 penetrates the connecting disc 28 and is inserted into the inner screening cylinder 21. The rotating ring 29 is rotatably positioned on the inner end face of the connecting plate 23. The compression spring 30 is sleeved on the connecting pipe 31, with its two ends respectively fixed to the end face of the rotating ring 29 and the connecting disc 21. The end face of the receiving plate 28 has a spiral groove 35 on the inner wall of the outer cylinder 20. The outer wall of the connecting plate 28 away from the compression spring 30 has a spring groove 34. The lower end of the buffer spring 32 is fixed to the inner bottom wall of the spring groove 34. The lower end of the linkage block 33 is slidably disposed in the spring groove 34 and fixedly connected to the upper end of the buffer spring 32. The upper end of the linkage block 33 is slidably engaged with the spiral groove 35. The upper end of the feeding pipe 24 penetrates the closed end face of the outer cylinder 20. The upper end of the connecting cylinder 26 is fixed to the lower end of the inner screening cylinder 21, and the lower end of the connecting cylinder 26 is slidably disposed in the feed pipe 24. The limiting strip 27 is disposed on the outer wall of the connecting cylinder 26, and the inner wall of the feed pipe 24 is provided with a limiting groove 36. The limiting strip 27 is slidably disposed in the limiting groove 36. The conical toothed disc 25 is disposed at the closed end of the feed pipe 24 near the outer cylinder 20, and the cleaning brush 22 is disposed along the axis on the upper side of the inner wall of the outer cylinder 20.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, one end of the second bend 15 is located on the lower side of the outer wall of the closed end of the outer cylinder 20 of the primary screening component 7, and the other end is located on the outer end face of the connecting plate 23 of the secondary screening component 8 and is connected to the connecting pipe 31 of the secondary screening component 8.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, one end of the bent pipe 16 is located on the lower side of the outer wall of the closed end of the outer cylinder 20 of the secondary screening component 8, and the other end is located on the outer end face of the connecting plate 23 of the tertiary screening component 9 and is connected to the connecting pipe 31 of the tertiary screening component 9.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the lower end of the bend 17 passes through the upper end face of the connecting plate 23 of the primary screening component 7 and is connected to the connecting pipe 31 of the primary screening component 7.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, the upper end of the bent tube 19 is located on the lower side of the outer wall of the closed end of the outer cylinder 20 of the three-stage screening assembly 9.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the outer cylinder 20 of the primary screening component 7 is fixed to the triangular plate 5 by the connecting frame 12.

[0030] like Figure 1 , Figure 3 , Figure 6 and Figure 10 As shown, the two ends of the spiral groove 35 are smoothly connected to the inner wall of the outer cylinder 20.

[0031] like Figure 4 and Figure 5 As shown, the mesh size of the inner screening cylinder 21 in the primary screening component 7, the secondary screening component 8, and the tertiary screening component 9 increases sequentially.

[0032] like Figure 1 , Figure 2 and Figure 7 As shown, to enable the bevel gear discs 25 in the primary screening assembly 7, secondary screening assembly 8, and tertiary screening assembly 9 to rotate simultaneously, the rotary linkage assembly 13 includes pulley 37, pulley 38, pulley 39, bevel gear 40, bevel gear 41, bevel gear 42, rotating shaft 43, rotating shaft 44, rotating shaft 45, and belt 46. Rotating shafts 43, 44, and 45 are respectively rotatably positioned at the three corners of the triangular plate 5. Pulley 37 is mounted on rotating shaft 43, and pulley 38 is mounted on rotating shaft 45. On shaft 2 44, pulley 39 is mounted on rotating shaft 3 45, belt 46 is mounted on pulley 1 37, pulley 2 38 and pulley 39, bevel gear 1 40 is mounted at the end of rotating shaft 1 43, bevel gear 2 41 is mounted at the end of rotating shaft 2 44, and bevel gear 3 42 is mounted at the end of rotating shaft 3 45. Bevel gear 1 40 meshes with the bevel gear disk 25 of primary screening component 7, bevel gear 2 41 meshes with the bevel gear disk 25 of secondary screening component 8, and bevel gear 3 42 meshes with the bevel gear disk 25 of tertiary screening component 9.

[0033] like Figure 1 and Figure 8 The diagram shows one embodiment of the power linkage assembly 14, which provides power to the rotary linkage assembly 13. The power linkage assembly 14 includes a mounting bracket 47, a motor 48, a drive shaft 49, and a drive bevel gear 50. The mounting bracket 47 is U-shaped, and its two ends are fixed to the outer side wall of the triangular plate 5. The drive shaft 49 passes through the upper wall of the mounting bracket 47. The motor 48 is located on the upper wall of the mounting bracket 47 and connected to the upper end of the drive shaft 49. The drive bevel gear 50 is located at the lower end of the drive shaft 49.

[0034] In practical use, first turn on the motor 48. The motor 48 drives the drive shaft 49 to rotate, which in turn drives the drive bevel gear 50 to rotate. The drive bevel gear 50 drives the bevel disc 25 of the primary screening component 7 to rotate, which in turn drives the feed pipe 24 of the primary screening component 7 to rotate. The feed pipe 24 drives the connecting cylinder 26 of the primary screening component 7 to rotate, which in turn drives the inner screening cylinder 21 of the primary screening component 7 to rotate. The bevel disc 25 of the primary screening component 7 drives the first bevel gear 40 to rotate, which in turn drives the first rotating shaft 43 to rotate. The first rotating shaft 43 drives the first pulley 37 to rotate, which in turn drives the belt 46 to rotate. The belt 46 drives the second pulley 38 and the third pulley 39 to rotate simultaneously. When the belt 46 drives the second pulley 38 to rotate, the second pulley 38 drives the second rotating shaft 44 to rotate. When the belt 46 drives the pulley 39 to rotate, the pulley 39 drives the rotating shaft 35 to rotate, the rotating shaft 345 drives the bevel gear 32 to rotate, the bevel gear 342 drives the bevel gear 25 of the tertiary screening component 9 to rotate, the bevel gear 25 drives the bevel gear 25 of the tertiary screening component 9 to rotate, the bevel gear 25 drives the feed pipe 24 of the tertiary screening component 9 to rotate, the feed pipe 24 drives the connecting cylinder 26 of the tertiary screening component 8 to rotate, and the inner screening cylinder 21 of the tertiary screening component 9 to rotate. Concrete aggregate is added to the hopper 18. The aggregate enters the connecting pipe 31 of the primary screening assembly 7 through the bend 17, and then enters the inner screening cylinder 21 of the primary screening assembly 7 through the connecting pipe 31. The aggregate slides down the inner screening cylinder 21 of the primary screening assembly 7. Due to the rotation of the inner screening cylinder 21, fine aggregate is screened and falls into the outer cylinder 20 of the primary screening assembly 7, while coarse aggregate slides down the inner screening cylinder 21 of the primary screening assembly 7 into the connecting cylinder 26 of the primary screening assembly 7, and then slides into the discharge pipe 24 of the primary screening assembly 7. It is then discharged from the discharge pipe 24 of the primary screening assembly 7. The screened aggregate slides down the outer cylinder 20 of the primary screening assembly 7 into the bend 15, and then enters the connecting pipe 31 of the secondary screening assembly 8 through the bend 15. The stone is screened again as it slides down the inner screening cylinder 21 of the secondary screening component 8. The coarse stone enters the feed pipe 24 of the secondary screening component 8 along the inner screening cylinder 21 and is then discharged from the feed pipe 24. The screened stone slides down the outer cylinder 20 of the secondary screening component 8 into the bend pipe 16 and then into the connecting pipe 31 of the tertiary screening component 9. After passing through the connecting pipe 31, the stone enters the inner screening cylinder 21 of the tertiary screening component 9 and slides down the inner screening cylinder 21. The stone is screened for the third time. The coarse stone enters the feed pipe 24 of the tertiary screening component 9 along the inner screening cylinder 21 and is then discharged from the feed pipe 24. The screened fine stone slides down the outer cylinder 20 of the tertiary screening component 9 into the bend pipe 19 and is then discharged from the bend pipe 19. During the rotation of the inner screening cylinder 21 of the primary screening component 7, the secondary screening component 8, and the tertiary screening component 9, the inner screening cylinder 21 drives the connecting disc 28 to rotate, and the connecting disc 28 drives the linkage block 33 to rotate. When the linkage block 33 is within the spiral groove 35, the buffer spring 32 pushes the linkage block 33 outward, and the linkage block 33 always moves along the spiral groove 35. The linkage block 33 moves towards the connecting plate 23, and the connecting plate drives the connecting disc 28 to move towards the connecting plate 23. The connecting disc 28 drives the inner screening cylinder 21 to move towards the connecting plate 23, and the inner screening cylinder 21 drives the connecting cylinder 26 to move. When the linkage block 33 is within the spiral groove... After the spiral groove 35 is disengaged, the inner wall of the outer cylinder 20 presses down the linkage block 33, and the linkage block 33 presses down the buffer spring 32. At this time, the linkage block 33 is not restricted by the spiral groove 35, and the compression spring 30 quickly pushes the connecting plate 28 downward. The connecting plate 28 drives the inner screening cylinder 21 downward, and the inner screening cylinder 21 pushes the connecting cylinder 26 downward. During the process of the inner screening cylinder 21 driving the connecting plate 28 and the linkage block 33 to rotate, the inner screening cylinder 21 moves back and forth along the axial direction. During this process, the inner screening cylinder 21 moves slowly upward and moves quickly downward, thereby increasing the residence time of the stone in the inner screening cylinder 21 and improving the screening efficiency. During the rotation of the inner screening cylinder 21 of the primary screening component 7, the secondary screening component 8, and the tertiary screening component 9, the cleaning brushes 22 of the primary screening component 7, the secondary screening component 8, and the tertiary screening component 9 clean the upper side of the inner screening cylinder 21 of the primary screening component 7, the secondary screening component 8, and the tertiary screening component 9 respectively, so as to avoid clogging of the inner screening cylinder 21.

[0035] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A concrete screening device, comprising a base plate (1), characterized in that: The upper wall of the base plate (1) is provided with a front support frame (2) and a rear support frame (3). The inner sidewalls of the front support frame (2) and the rear support frame (3) are symmetrically provided with connecting rods (4). Each of the two connecting rods (4) is fixed with a triangular plate (5). A multi-stage screening assembly (6) is provided between the two triangular plates (5). The multi-stage screening assembly (6) includes a primary screening assembly (7), a secondary screening assembly (8), and a tertiary screening assembly (9). The primary screening assembly (7), the secondary screening assembly (8), and the tertiary screening assembly (9) have the same structure. The primary screening assembly (7), the secondary screening assembly (8), and the tertiary screening assembly (9) are arranged in a zigzag pattern from top to bottom. The primary screening assembly (7) and the secondary screening assembly (8) are connected by a fixing frame (10). The secondary screening component (8) and the tertiary screening component (9) are connected by a fixing frame two (11). The primary screening component (7) is fixed on a triangular plate (5) by a connecting frame (12). A rotation linkage component (13) is provided between the triangular plate (5) and the multi-stage screening component (6). A power linkage component (14) is provided on the upper part of the two triangular plates (5). The primary screening component (7) and the secondary screening component (8) are connected by a bend pipe two (15). The secondary screening component (8) and the tertiary screening component (9) are connected by a bend pipe three (16). The primary screening component (7) is provided with a bend pipe one (17). The upper end of the bend pipe one (17) is connected to a feed hopper (18). The tertiary screening component (9) is provided with a bend pipe four (19).

2. The concrete screening device according to claim 1, characterized in that: The primary (secondary, tertiary) screening assembly (7 (8, 9)) includes an outer cylinder (20), an inner screening cylinder (21), a cleaning brush (22), a connecting plate (23), a feed pipe (24), a conical toothed disc (25), a connecting cylinder (26), a limiting strip (27), a connecting disc (28), a rotating ring (29), a compression spring (30), a connecting pipe (31), a linkage block (33), a buffer spring (32), and a spiral groove (35). The lower end of the outer cylinder (20) is a closed end, and its upper end is an open end. Its closed end is inclined downwards. The connecting plate (29) 3) The inner screening cylinder (21) is located inside the outer cylinder (20) at the open end of the outer cylinder (20). The connecting plate (28) is located at the upper end of the inner screening cylinder (21). The upper end of the connecting pipe (31) passes through the connecting plate (23) and extends to its inner side. The lower end of the connecting pipe (31) passes through the connecting plate (28) and is inserted into the inner screening cylinder (21). The rotating ring (29) is rotatably located on the inner end face of the connecting plate (23). The compression spring (30) is sleeved on the connecting pipe (31) and its two ends are respectively fixed to the end face of the rotating ring (29). The inner wall of the outer cylinder (20) is provided with a spiral groove (35) and the end face of the connecting plate (28). The outer wall of the connecting plate (28) away from the compression spring (30) is provided with a spring groove (34). The lower end of the buffer spring (32) is fixed to the inner bottom wall of the spring groove (34). The lower end of the linkage block (33) is slidably disposed in the spring groove (34) and fixedly connected to the upper end of the buffer spring (32). The upper end of the linkage block (33) is slidably engaged with the spiral groove (35). The upper end of the feed pipe (24) penetrates the closed end of the outer cylinder (20). The upper end of the connecting cylinder (26) is fixed to the lower end of the inner screening cylinder (21), and the lower end of the connecting cylinder (26) is slidably disposed in the feed pipe (24). The limiting strip (27) is disposed on the outer wall of the connecting cylinder (26), and the inner wall of the feed pipe (24) is provided with a limiting groove (36). The limiting strip (27) is slidably disposed in the limiting groove (36). The bevel toothed disc (25) is disposed at the closed end of the feed pipe (24) near the outer cylinder (20). The cleaning brush (22) is disposed along the axis on the upper side of the inner wall of the outer cylinder (20).

3. A concrete screening device according to claim 2, characterized in that: One end of the second bend (15) is located on the lower side of the outer wall of the closed end of the outer cylinder (20) of the first-stage screening component (7), and the other end is located on the outer end face of the connecting plate (23) of the second-stage screening component (8) and connected to the connecting pipe (31) of the second-stage screening component (8).

4. A concrete screening device according to claim 3, characterized in that: One end of the three-bend tube (16) is located on the lower side of the outer wall of the closed end of the outer cylinder (20) of the secondary screening component (8), and the other end is located on the outer end face of the connecting plate (23) of the tertiary screening component (9) and connected to the connecting pipe (31) of the tertiary screening component (9).

5. A concrete screening device according to claim 4, characterized in that: The lower end of the bend (17) passes through the upper end face of the connecting plate (23) of the primary screening component (7) and is connected to the connecting pipe (31) of the primary screening component (7).

6. A concrete screening device according to claim 5, characterized in that: The upper end of the four-bend tube (19) is located on the lower side of the outer wall of the closed end of the outer cylinder (20) of the three-stage screening assembly (9).

7. A concrete screening device according to claim 6, characterized in that: The outer cylinder (20) of the primary screening component (7) is fixed to the triangular plate (5) by the connecting frame (12).

8. A concrete screening device according to claim 7, characterized in that: The two ends of the spiral groove (35) are smoothly connected to the inner wall of the outer cylinder (20).

9. A concrete screening device according to claim 8, characterized in that: The mesh size of the inner screening cylinder (21) in the primary screening component (7), secondary screening component (8) and tertiary screening component (9) increases sequentially.

10. A concrete screening device according to claim 9, characterized in that: The rotary linkage assembly (13) includes pulley one (37), pulley two (38), pulley three (39), bevel gear one (40), bevel gear two (41), bevel gear three (42), rotating shaft one (43), rotating shaft two (44), rotating shaft three (45), and belt (46). The rotating shaft one (43), rotating shaft two (44), and rotating shaft three (45) are respectively rotatably located at the three corners of the triangular plate (5). The pulley one (37) is located on the rotating shaft one (43), the pulley two (38) is located on the rotating shaft two (44), and the pulley three (39) is located on the rotating shaft three (45). 5) The belt (46) is provided on pulley one (37), pulley two (38) and pulley three (39). The bevel gear one (40) is provided at the end of the rotating shaft one (43). The bevel gear two (41) is provided at the end of the rotating shaft two (44). The bevel gear three (42) is provided at the end of the rotating shaft three (45). The bevel gear one (40) meshes with the bevel gear disk (25) of the primary screening component (7). The bevel gear two (41) meshes with the bevel gear disk (25) of the secondary screening component (8). The bevel gear three (42) meshes with the bevel gear disk (25) of the tertiary screening component (9).

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