Screening device for supporting filling raw materials
By designing components such as the internal extrusion block, guide plate, and air blowing pipe of the screening device, the problem of material adhesion during the screening process was solved, achieving efficient separation and reducing wear, thereby improving screening accuracy and equipment life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUAIBEI MINING CO LTD
- Filing Date
- 2025-12-23
- Publication Date
- 2026-04-14
AI Technical Summary
During the screening process, when flaky and needle-shaped aggregates are mixed, their different shapes cause them to adhere to the side wall of the screening device, making them difficult to separate, which leads to a decrease in screening accuracy and wear of the device.
A screening device for supporting filling raw materials was designed, including a screening cylinder, a cleaning component, a feeding component, an air blowing pipe, and auxiliary components. The device breaks needle-shaped materials through an internal extrusion block, adjusts the material falling path using a guide plate and an air blowing pipe, and reduces material adhesion by combining a flap plate and a tension spring, thereby improving screening efficiency.
It effectively separates flaky and needle-like materials, reduces wear on screening devices, and improves screening accuracy and equipment lifespan.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of support material pretreatment, specifically to a screening device for support filling raw materials. Background Technology
[0002] In mining and underground engineering construction, support is a crucial measure to ensure the safety and stability of the working space. With increasing mining depth and more complex geological conditions, traditional passive support is insufficient to effectively suppress surrounding rock deformation. Active backfill support, by injecting backfill material into the goaf to form a support structure, can both transfer ground pressure and reduce stress concentration, and isolate harmful gases from escaping the goaf, significantly improving the long-term stability of roadways or chambers. The backfill material must possess good fluidity, strength, and durability; its performance directly affects the support effect and project cost. Therefore, higher requirements are placed on the pretreatment of backfill materials.
[0003] In existing technologies, the main raw materials for support and backfilling include industrial solid wastes such as tailings, fly ash, and coal gangue, as well as aggregates and cement-based cementitious materials. Tailings has become the mainstream due to its wide availability and low cost. Fly ash can improve the rheological properties of the slurry, and aggregates have high strength. Mixing multiple raw materials makes it easier to formulate backfill slurries suitable for roadway support.
[0004] However, in actual production, due to the different sources of different types of filling materials, the types of crushing devices used are also different. When screening them, flaky aggregates and needle-shaped aggregates will be mixed. When aggregates of different shapes pass through the screening device, they will adhere to the side wall of the screening device due to their own shape. However, due to the difference in shape, some of the more firmly attached materials cannot be separated from the screening device by impact and vibration alone. Over time, this may cause the screening holes to deform, which in turn leads to a decrease in screening accuracy. Summary of the Invention
[0005] In view of this, a screening device for support filling materials is proposed to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a screening device for supporting filling materials, comprising a base, a drive wheel rotatably mounted on the base, a screening cylinder disposed on the drive wheel, and a feeding assembly fixedly mounted on the ground on one side of the screening cylinder, and further comprising: A cleaning component, mounted on the base, is used to clean material stuck on the screening cylinder.
[0007] The cleaning assembly includes a mounting frame, which is fixedly mounted on the base. Two fixing plates are fixedly mounted on the mounting frame, a connecting rod is fixedly mounted between the two fixing plates, and an inner extrusion block is fixedly mounted between the two fixing plates. The side of the inner extrusion block closest to the inner wall of the screening cylinder is arc-shaped, and the inner extrusion block is parallel to the ground.
[0008] Preferably, the feeding assembly includes a feeding trough, which has a wide end and a narrow end. A through groove is provided near the narrow end of the feeding trough, and a plurality of blocking rods are fixedly installed in the through groove. A guide plate is fixedly installed at the narrow end of the feeding trough, and the guide plate is at a certain angle to the feeding trough.
[0009] Preferably, a protective sleeve is fixedly installed on the side wall of the feeding trough, an air blowing pipe is fixedly installed inside the protective sleeve, and a protective pad is fixedly installed on the side wall of the feeding trough near the narrow end of the air blowing pipe.
[0010] Preferably, the protective pad is provided with an arc-shaped section, the starting end of which is located below the air blowing pipe and the ending end is located above the through groove.
[0011] Preferably, the air outlet of the air blowing pipe is oriented towards the position where the side wall of the feeding trough and the arc-shaped section of the protective pad are sandwiched.
[0012] Preferably, tension springs are fixedly installed on both sides of the inner extrusion block, and a flap is fixedly installed on the other end of the tension spring. The flap is located on the base at the feed inlet and discharge outlet of the screening cylinder, and a ramp is provided on the flap.
[0013] Preferably, the inner extrusion block is oriented diagonally upward at a 45° angle to the ground.
[0014] Preferably, an auxiliary component is fixedly installed on the base. The auxiliary component includes a sleeve, an outer extrusion block is fixedly installed on the outer wall of the sleeve, and a rotating rod is provided inside the sleeve.
[0015] Preferably, the cross-sectional shape of the rotating rod is gourd-shaped.
[0016] Preferably, the guide plate forms an obtuse angle of 100-120° with the bottom surface of the feeding trough.
[0017] Compared with the prior art, the present invention provides a screening device for support filling materials, which has the following beneficial effects: 1. This invention, through the cooperation of the screening cylinder and the cleaning component, allows needle-like materials to be more easily inserted into the screening holes of the screening cylinder when it is in use. Some needle-like materials that are not firmly inserted will fall down as the screening cylinder moves to the top, without affecting the screening cylinder. Some needle-like materials that cannot fall down even when they reach the highest point of the screening cylinder cannot fall down by their own gravity. At this time, the inner extrusion block cooperates with the screening cylinder to break off the sharp ends of the needle-like materials from the inside. The smaller sharp ends will fall from the outside of the screening cylinder into the collection box below the screening cylinder. The part left in the screening cylinder can be approximated as sheet material, and can be sorted together with the sheet material.
[0018] 2. This invention, through the cooperation of the air blowing pipe and the guide plate, allows the smaller needle-shaped materials to be fed preferentially at the through trough when needle-shaped materials and flake-shaped materials are mixed and fed. This allows the needle-shaped materials to undergo a longer screening time, while the larger flake-shaped materials are fed through the guide plate. The air blowing pipe also gives the flake-shaped materials a greater initial falling velocity, causing them to be thrown to a higher position. During the falling process, the flake-shaped materials are more likely to flip due to their larger surface area, which reduces the probability of the flake-shaped materials sticking to the side wall of the screening cylinder. At the same time, the different falling positions of the two materials can reduce the wear of fixed feeding positions to a certain extent.
[0019] 3. This invention, through the cooperation of a tension spring and a flap, allows the portion of needle-shaped material remaining in the screening cylinder after the sharp end is broken off to be approximated as sheet material. However, since the broken needle-shaped material is close to the lowest point of the screening cylinder, it is very likely to adhere tightly to the inner wall of the screening cylinder. At this time, by rotating the flap driven by the tension spring, the broken needle-shaped material can be reduced from adhering tightly to the bottom of the screening cylinder and being difficult to screen under the flipping action of the flap. Attached Figure Description
[0020] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is an overall structural diagram of the feeding assembly of the present invention; Figure 3 This is an overall structural diagram of the cleaning component of the present invention; Figure 4 This is an overall structural diagram of another cleaning component of the present invention; Figure 5 This is an overall structural diagram of the other side of the invention; Figure 6 This is a disassembled diagram of the auxiliary components of the present invention.
[0021] In the picture: 1. Base; 2. Drive wheel; 3. Screening cylinder; 4. Feeding assembly; 41. Feeding chute; 42. Through groove; 43. Guide plate; 44. Blocking rod; 45. Protective sleeve; 46. Air blowing pipe; 47. Protective pad; 5. Cleaning components; 51. Mounting bracket; 52. Fixing plate; 53. Connecting rod; 54. Inner extrusion block; 55. Tension spring; 56. Flip plate; 57. Ramp; 6. Auxiliary components; 61. Sleeve; 62. External extrusion block; 63. Rotating rod. Detailed Implementation
[0022] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, some features described in the examples may be combined in other examples.
[0023] like Figures 1 to 6 As shown, this embodiment of the invention provides a screening device for support filling materials, including a base 1, a drive wheel 2 rotatably mounted on the base 1, a screening cylinder 3 mounted on the drive wheel 2, and a feeding assembly 4 fixedly mounted on the ground on one side of the screening cylinder 3. The device also includes: The cleaning component 5, located on the base 1, is used to clean the material stuck on the screening cylinder 3.
[0024] The cleaning component 5 includes a mounting frame 51, which is fixedly mounted on the base 1. Two fixing plates 52 are fixedly mounted on the mounting frame 51. A connecting rod 53 is fixedly mounted between the two fixing plates 52. An inner squeezing block 54 is fixedly mounted between the two fixing plates 52. The side of the inner squeezing block 54 closest to the inner wall of the screening cylinder 3 is set as arc-shaped, and the inner squeezing block 54 is parallel to the ground.
[0025] The working principle and beneficial effects of the above technical solution are as follows: Mixed aggregate is added into the screening cylinder 3 through the feeding component 4. After the mixed aggregate enters the screening cylinder 3, it will be screened under the action of the rotation of the screening cylinder 3. Some needle-shaped materials inserted into the screen holes of the screening cylinder 3 will cause the screen holes to deform, affecting the subsequent screening accuracy. Some needle-shaped materials that are not firmly inserted will fall down when the screening cylinder 3 moves to the top, without affecting the screening cylinder 3. Some needle-shaped materials that reach the highest point of the screening cylinder 3 but still cannot fall down cannot fall down by their own gravity. At this time, the inner extrusion block 54 cooperates with the screening cylinder 3 to break off the sharp segment of the needle-shaped material from the inside. The smaller sharp segment will fall from the outside of the screening cylinder 3 into the collection box below the screening cylinder 3. The part left in the screening cylinder 3 can be regarded as a piece of sheet material, which can be sorted together with the sheet material.
[0026] In one embodiment: the feeding assembly 4 includes a feeding trough 41, which has a wide end and a narrow end. A through groove 42 is provided near the narrow end of the feeding trough 41. A plurality of blocking rods 44 are fixedly installed in the through groove 42. A guide plate 43 is fixedly installed at the narrow end of the feeding trough 41. The guide plate 43 is at a certain angle to the feeding trough 41.
[0027] The working principle and beneficial effects of the above technical solution are as follows: When mixed aggregate is added into the feeding component 4, it slides down along the feeding chute 41 under the action of gravity. At this time, the needle-shaped material with a smaller overall volume will be fed first at the through chute 42, so that the needle-shaped material can undergo a longer screening time. The sheet-shaped material with a larger overall volume will be fed through the guide plate 43. The different falling positions of the two can reduce the wear of the fixed feeding position to a certain extent.
[0028] In one embodiment: a protective sleeve 45 is fixedly installed on the side wall of the feeding trough 41, an air blowing pipe 46 is fixedly installed inside the protective sleeve 45, and a protective pad 47 is fixedly installed on the side wall of the feeding trough 41 near the narrow end of the air blowing pipe 46.
[0029] The working principle and beneficial effects of the above technical solution are as follows: the protective sleeve 45 can reduce the probability of the air blowing pipe 46 being damaged by the impact of the material, and the protective pad 47 is set in front of the through groove 42. The gas blown out by the air blowing pipe 46 can be blown to the through groove 42 through the guide of the protective pad 47, so that the material blocked here can be discharged better.
[0030] In one embodiment, the protective pad 47 is provided with an arc-shaped segment, the starting end of which is located below the air blowing pipe 46, and the ending end of which is located above the through groove 42.
[0031] The working principle and beneficial effects of the above technical solution are as follows: the protective sleeve 45 can reduce the probability of the air blowing pipe 46 being damaged by the impact of the material, and the protective pad 47 is set in front of the through groove 42. The gas blown out by the air blowing pipe 46 can be blown to the through groove 42 through the guide of the protective pad 47, so that the material blocked here can be discharged better. In addition, the air blowing pipe 46 can give the sheet material a greater initial falling velocity, so that it is thrown to a higher position. During the falling process, the sheet material is more likely to overturn due to its large surface area, which can reduce the probability of the sheet material sticking to the side wall of the screening cylinder 3.
[0032] In one embodiment, the air outlet of the air blowing pipe 46 faces the position where the side wall of the feed trough 41 is sandwiched between the arc-shaped section of the protective pad 47.
[0033] The working principle and beneficial effects of the above technical solution are as follows: When the material is fed, it will carry some dust. The air blowing pipe 46 is relatively humid and more likely to stick to dust. Orienting the air blowing pipe 46 toward the side wall of the feeding trough 41 can greatly reduce the probability of dust coming into contact with the air blowing pipe 46 and reduce the occurrence of blockage.
[0034] In one embodiment: tension springs 55 are fixedly installed on both sides of the inner extrusion block 54, and a flap 56 is fixedly installed on the other end of the tension spring 55. The two ends of the flap 56 are respectively located on the base 1 at the feed inlet and discharge outlet of the screening cylinder 3, and a ramp 57 is provided on the flap 56.
[0035] The working principle and beneficial effects of the above technical solution are as follows: When the inner extrusion block 54 is used in conjunction with the screening cylinder 3 to break the needle-shaped material, it will move under the extrusion action, thereby causing the tension spring 55 to move a certain distance, and then causing the flip plate 56 to rotate, so that the material falling on the flip plate 56 is turned over, reducing the probability of it adhering to the screening cylinder 3.
[0036] In one embodiment, the inner extrusion block 54 faces upward at a 45° angle to the ground.
[0037] The working principle and beneficial effects of the above technical solution are as follows: According to the Coulomb-Mohr fracture criterion, when a brittle material is subjected to compressive shear, the fracture surface is along the direction of the maximum shear stress. For needle-shaped materials under uniaxial compression, after its sharp end is inserted into the sieve hole, the constraint of the sieve hole wall on the material will generate radial pressure. At this time, the angle between the surface of the maximum shear stress and the plane of the sieve hole is 45°. This direction can effectively concentrate the shear stress and reduce the compressive force required for fracture.
[0038] In one embodiment: an auxiliary component 6 is fixedly installed on the base 1. The auxiliary component 6 is disposed on the base 1. The auxiliary component 6 includes a sleeve 61. An external extrusion block 62 is fixedly installed on the outer wall of the sleeve 61. A rotating rod 63 is disposed inside the sleeve 61.
[0039] The working principle and beneficial effects of the above technical solution are as follows: the rotating rod 63 rotates with the rotation of the screening cylinder 3, and the sleeve 61 is not tightly attached to the rotating rod 63, but is fixed to the base 1. At this time, the outer extrusion block 62 and the inner extrusion block 54 cooperate to better break the needle-like material, reduce the impact on the screen holes of the screening cylinder 3, and the angle between the outer extrusion block 62 and the inner extrusion block 54 can be adjusted by itself to minimize the impact on the screen holes and achieve the best breaking effect.
[0040] In one embodiment, the cross-sectional shape of the rotating rod 63 is gourd-shaped.
[0041] The working principle and beneficial effects of the above technical solution are as follows: When the rotating rod 63 rotates, it will periodically collide with the outer wall of the screening cylinder 3, which will cause some easily falling materials to fall down. The sleeve 61 is separated from the other two. The sleeve 61 is made of rubber, which can reduce the wear caused by the collision of the rotating rod 63 with the screening cylinder 3.
[0042] In one embodiment, the guide plate 43 forms an obtuse angle of 100-120° with the bottom surface of the feeding trough 41.
[0043] The working principle and beneficial effects of the above technical solution are as follows: When the needle-shaped material is dropped too high, it gains more kinetic energy when falling, and the "piercing force" of the sharp end on the screen hole is enhanced, making it easy to break through the elastic deformation limit of the screen hole, causing the sharp end to get stuck in the screen hole; at the same time, dropping too high may cause uneven material dispersion, and local concentrated dropping will aggravate the impact on the screen hole. Therefore, it is necessary to drop it at a lower position. When the sheet-shaped material is dropped too low, the material cannot be effectively dispersed by gravity and is easy to accumulate at the bottom, increasing the chance of contact with the roller and increasing the probability of adhesion. The guiding effect of the guide plate 43 can guide the sheet-shaped material to a higher position and allow the needle-shaped material to be dropped from a lower position.
[0044] Working principle and usage process: Mixed aggregate is added into the screening cylinder 3 through the feeding component 4. After the mixed aggregate enters the screening cylinder 3, it will be screened under the action of the rotation of the screening cylinder 3. Some needle-shaped materials inserted into the screen holes of the screening cylinder 3 will cause the screen holes to deform, affecting the subsequent screening accuracy. Some needle-shaped materials that are not firmly inserted will fall down when the screening cylinder 3 moves to the top, without affecting the screening cylinder 3. Some needle-shaped materials that cannot fall down even when they reach the highest point of the screening cylinder 3 cannot fall down by their own gravity. At this time, the inner extrusion block 54 cooperates with the screening cylinder 3 to break off the sharp ends of the needle-shaped materials from the inside. The smaller sharp ends will fall from the outside of the screening cylinder 3 into the collection box below the screening cylinder 3. The part left in the screening cylinder 3 can be regarded as a piece of sheet material, which can be sorted together with the sheet material.
[0045] Before this, mixed aggregates are added into the feeding assembly 4 and slide down along the feeding chute 41 under the action of gravity. At this time, the needle-shaped materials with smaller overall volume will be fed first at the through chute 42, so that the needle-shaped materials can undergo a longer screening time. The sheet-shaped materials with larger overall volume will be fed through the guide plate 43. The different falling positions of the two can reduce the wear of the fixed feeding position to a certain extent.
[0046] Based on the above, the protective sleeve 45 can reduce the probability of the air blowing pipe 46 being damaged by material impact, and the protective pad 47 is set in front of the through groove 42. The gas blown out by the air blowing pipe 46 can be blown to the through groove 42 through the guide of the protective pad 47, so that the material blocked here can be discharged better. In addition, the air blowing pipe 46 can give the sheet material a greater initial falling velocity, so that it is thrown to a higher position. During the falling process, the sheet material is more likely to overturn due to its large surface area, which can reduce the probability of the sheet material sticking to the side wall of the screening cylinder 3.
[0047] In addition, since some dust is carried along when the material is fed, the air pipe 46 is relatively damp and more prone to dust accumulation. Orienting the air pipe 46 toward the side wall of the feeding trough 41 can greatly reduce the probability of dust coming into contact with the air pipe 46 and reduce the occurrence of blockages.
[0048] Furthermore, when the inner extrusion block 54 works with the screening cylinder 3 to break the needle-shaped material, it will move under the extrusion action, thereby causing the tension spring 55 to move a certain distance, which in turn causes the flap 56 to rotate, so that the material falling on the flap 56 is turned over, reducing the probability of it adhering to the screening cylinder 3.
[0049] According to the Coulomb-Mohr fracture criterion, when a brittle material is subjected to compressive shear, the fracture surface is along the direction of maximum shear stress. For needle-shaped materials under uniaxial compression, after their sharp ends are inserted into the sieve holes, the constraint of the sieve hole wall on the material generates radial pressure. At this time, the angle between the surface of maximum shear stress and the plane of the sieve hole is 45°. This direction can effectively concentrate shear stress and reduce the compressive force required for fracture.
[0050] Based on the above, the rotating rod 63 rotates along with the rotation of the screening cylinder 3, and the sleeve 61 is not tightly attached to the rotating rod 63, but is fixed to the base 1. At this time, the outer extrusion block 62 and the inner extrusion block 54 cooperate to better break the needle-like materials and reduce the impact on the screen holes of the screening cylinder 3. The angle between the outer extrusion block 62 and the inner extrusion block 54 can be adjusted to minimize the impact on the screen holes and achieve the best breaking effect. When the rotating rod 63 rotates, it will periodically collide with the outer wall of the screening cylinder 3, which will cause some easily falling materials to fall down. The sleeve 61 is placed between the two and is made of rubber, which can reduce the wear caused by the collision of the rotating rod 63 with the screening cylinder 3.
[0051] Finally, when needle-shaped materials are fed from too high a height, they gain more kinetic energy as they fall, increasing the "piercing force" of their sharp ends on the screen holes. This makes them more likely to exceed the elastic deformation limit of the screen holes, causing the sharp ends to get stuck in the screen holes. At the same time, excessively high drops may lead to uneven material dispersion, with localized concentrated drops exacerbating the impact on the screen holes. Therefore, it is necessary to feed them from a lower height. When sheet-shaped materials are fed from too low a height, they cannot be effectively dispersed by gravity and tend to accumulate at the bottom, increasing the chance of contact with the rollers and increasing the probability of adhesion. The guiding effect of the guide plate 43 can guide sheet-shaped materials to a higher position and allow needle-shaped materials to be fed from a lower position.
[0052] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.
Claims
1. A screening device for supporting filling materials, comprising a base (1), a drive wheel (2) rotatably mounted on the base (1), a screening cylinder (3) disposed on the drive wheel (2), and a feeding assembly (4) fixedly mounted on the ground on one side of the screening cylinder (3), characterized in that, Also includes: A cleaning component (5) is mounted on the base (1) and is used to clean materials stuck on the screening cylinder (3). The cleaning component (5) includes a mounting frame (51), which is fixedly mounted on the base (1). Two fixing plates (52) are fixedly mounted on the mounting frame (51). A connecting rod (53) is fixedly mounted between the two fixing plates (52). An inner squeezing block (54) is fixedly mounted between the two fixing plates (52). The side of the inner squeezing block (54) near the inner wall of the screening cylinder (3) is arc-shaped and parallel to the ground.
2. The screening device for support filling materials according to claim 1, characterized in that: The feeding assembly (4) includes a feeding trough (41), which has a wide end and a narrow end. A through groove (42) is provided near the narrow end of the feeding trough (41). Several blocking rods (44) are fixedly installed in the through groove (42). A guide plate (43) is fixedly installed at the narrow end of the feeding trough (41). The guide plate (43) is at a certain angle to the feeding trough (41).
3. The screening device for support filling materials according to claim 2, characterized in that: A protective sleeve (45) is fixedly installed on the side wall of the feeding trough (41), and an air blowing pipe (46) is fixedly installed inside the protective sleeve (45). A protective pad (47) is fixedly installed on the side wall of the feeding trough (41) near the narrow end of the air blowing pipe (46).
4. A screening device for support filling materials according to claim 3, characterized in that: The protective pad (47) is provided with an arc-shaped section, the starting end of which is located below the air blowing pipe (46), and the ending end is located above the through groove (42).
5. A screening device for support filling materials according to claim 4, characterized in that: The air outlet of the air pipe (46) is directed toward the position where the side wall of the feed trough (41) is sandwiched between the arc-shaped section of the protective pad (47).
6. A screening device for support filling materials according to claim 5, characterized in that: Tension springs (55) are fixedly installed on both sides of the inner extrusion block (54), and a flap (56) is fixedly installed on the other end of the tension spring (55). The flap (56) is located on the base (1) at the feed inlet and discharge outlet of the screening cylinder (3) respectively, and a ramp (57) is provided on the flap (56).
7. A screening device for support filling materials according to claim 6, characterized in that: The inner extrusion block (54) is oriented diagonally upward at a 45° angle to the ground.
8. A screening device for support filling materials according to claim 7, characterized in that: An auxiliary component (6) is fixedly installed on the base (1). The auxiliary component (6) is disposed on the base (1). The auxiliary component (6) includes a sleeve (61). An external extrusion block (62) is fixedly installed on the outer wall of the sleeve (61). A rotating rod (63) is disposed inside the sleeve (61).
9. A screening device for support filling materials according to claim 8, characterized in that: The cross-sectional shape of the rotating rod (63) is gourd-shaped.
10. A screening device for support filling materials according to claim 9, characterized in that: The guide plate (43) forms an obtuse angle of 100-120° with the bottom surface of the feeding trough (41).