Rotary gravel screening device
Through the design of shaftless screening cylinder and propulsion components, multi-stage screening and effective screening of wet materials are achieved, solving the problems of fine material inclusion and wet materials in existing devices, and improving the screening effect and applicability.
Patent Information
- Application Number
- CN202510518609.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2025-07-08
AI Technical Summary
The existing drum screening device is prone to fine materials and coarse materials during the screening process, which has poor screening effect and is difficult to deal with wet materials, which adds additional drying processes.
The shaftless screening cylinder design is adopted, combined with the propulsion components and the driving components, and the material is pushed forward backward through the propulsion components in the screening cylinder, and the reverse rotation of the multi-stage screening interval and the driving components are combined to realize multi-stage screening of materials and adapt to the screening of wet materials.
It improves the effectiveness and applicability of sand and gravel screening, and can effectively deal with different types of materials, including wet materials, reducing additional pretreatment steps.
Smart Images
Figure CN120268635A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a sand and gravel screening device, in particular to a rotary sand and gravel screening device. Background Art
[0002] Common sand and gravel screening equipment include vibrating screens, drum screens and linear screens. The rotary drum screen is mainly composed of a drum, a supporting structure, a driving device, and an inlet and outlet. It is usually used for grading particulate materials. The drum screen is arranged at a certain inclination angle and the driving device drives the drum screen to rotate. The material rolls inside, and the fine material passes through the screen holes, while the coarse material is discharged from the outlet with the inclination angle and rotation. For the drum screen with a segmented screen design, the drum is divided into multiple sections along the axial direction. The size of the screen holes in each section increases from the inlet to the outlet, thereby realizing continuous multi-stage screening.
[0003] During the screening process of the drum screen, most of the materials roll at the bottom of the drum. Since the coarse material is larger than the fine material in terms of particle size and weight, the fine material is easily mixed in between the coarse material. A longer drum is required to give the sand and gravel a longer rolling time to be completely screened. The distance between each sieve hole section of the multi-stage screening drum screen is relatively short. During the screening process, it is easy for the sand in the aperture of this area to be completely screened before the material has rolled to the next sieve hole section, resulting in the mixing of small-size materials in the screened large-size materials, and poor screening effect.
[0004] Moreover, for wet materials containing water, their own viscosity makes their rolling performance in the drum screen poor, so the wet materials need to be dried in advance, which virtually adds a process.
[0005] Therefore, there is a need for a screening device that can achieve multi-stage screening, improve the sand and gravel screening effect, and adapt to wet material screening operations. Summary of the invention
[0006] In view of this, the present invention provides a rotary sand and gravel screening device to solve the above technical problems.
[0007] The technical solution of the present invention is achieved in this way:
[0008] The present invention provides a rotary sand and gravel screening device, comprising a support frame and further comprising:
[0009] The shaftless screening drum is rotatably mounted on the support frame. The screening drum is evenly provided with a number of screening sections along the axial direction, and the sizes of the screen holes in different screening sections are different;
[0010] A propulsion component is arranged inside the screening drum, and two ends of the propulsion component extend out of the two ends of the screening drum and are rotatably connected to the support frame, wherein the propulsion component can propel the material in the screening drum from front to back when rotating;
[0011] The driving component is fixedly mounted on the support frame, wherein the driving component drives the screening drum to rotate on the support frame, and drives the propulsion component to rotate on the support frame in the opposite direction to the rotation direction of the screening drum.
[0012] Preferably, the propulsion component includes a propulsion shaft and a propulsion plate, the axial direction of the propulsion shaft and the axial direction of the screening drum are in the same plane, the propulsion plate is evenly fixed on the circumferential side wall of the propulsion shaft along a spiral shape, and the propulsion plate is vertically inclined.
[0013] Preferably, the propulsion shaft is located below the axis of the screening drum, the bottom of the propulsion plate is arc-shaped, and the arc-shaped bottom of the propulsion plate is tangent to the inner bottom wall of the screening drum during rotation.
[0014] Preferably, among the two adjacent propulsion plates, the front end of the rear propulsion plate is located within the rotation area of the front propulsion plate.
[0015] Preferably, the driving component includes a driving motor, a driving shaft, a driving wheel, a driven shaft and a driven wheel. The driving shaft and the driven shaft are arranged on both sides of the bottom of the screening drum, one on the left and the other on the right. Both ends of the driving shaft and the driven shaft are rotatably connected to the support frame. The driving wheel is sleeved on both ends of the driving shaft, and the driven wheel is sleeved on both ends of the driven shaft. The driving wheel and the driven wheel are clamped on both sides of the bottom of the screening drum, and the output shaft of the driving motor is coaxially connected to the driving shaft.
[0016] Preferably, the driving component is transmission-connected to the propulsion component via a linkage mechanism.
[0017] Preferably, the linkage mechanism comprises a main pulley and a secondary pulley, the main pulley is sleeved on the driving shaft, the secondary pulley is sleeved on the propulsion shaft, and the main pulley and the secondary pulley are connected by a transmission belt.
[0018] Preferably, a feed section is provided at the front end of the screening drum, a discharge section is provided at the rear end of the screening drum, the screening section is located between the feed section and the discharge section, and the driving wheel and the driven wheel are respectively located below the feed section and the discharge section.
[0019] Preferably, the support frame is further provided with a pressure roller which is parallel to and faces the same direction as the screening drum, and the pressure roller abuts against the outer side wall of the screening drum.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] The present invention provides a rotary sand and gravel screening device. The screening cylinder performs multi-stage screening on materials through different screening intervals, and collecting hoppers can be placed below each screening interval to separately collect the materials, thereby completing the multi-stage screening of the materials. For wet materials with adhesiveness, while the screening cylinder screens the materials, a pushing component is used to push the materials backward, so that the materials participate in the screening work of each screening interval. This is also applicable to materials with poor rolling effect in the screening cylinder. It can not only improve the screening effect of the materials, but also adapt to the screening work of different types of materials, greatly improving the adaptability. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only the preferred embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0023] Figure 1 is a schematic side view of the present invention;
[0024] Figure 2 is a schematic internal structure view of the screening cylinder of the present invention;
[0025] Figure 3 is a schematic front view of the screening cylinder of the present invention;
[0026] Figure 4 is a schematic three-dimensional structure view of the pushing component of the present invention;
[0027] Figure 5 is a top view of the pushing component of the present invention;
[0028] Figure 6 is a schematic structure view of the pressure roller of the present invention.
[0029] In the figure, 1, support frame; 2, screening cylinder; 3, pushing shaft; 4, pushing plate; 5, driving motor; 6, driving shaft; 7, driving pulley; 8, driven shaft; 9, driven pulley; 10, main pulley; 11, auxiliary pulley; 12, feeding interval; 13, discharging interval; 14, pressure roller. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention will be further described in conjunction with the drawings.
[0031] See Figures 1 to 6 , the present invention provides a rotary sand and gravel screening device, including a support frame 1, and further including:
[0032] The shaftless screening cylinder 2 is rotatably installed on the support frame 1. The screening cylinder is evenly provided with a number of screening intervals along the axial direction. The sizes of the screening holes in different screening intervals are different, and the screening holes gradually increase from front to back.
[0033] The pushing component is arranged inside the screening cylinder 2. Both ends of the pushing component extend out of both ends of the screening cylinder 2 and are rotatably connected to the support frame 1. When the pushing component rotates, it can push the materials in the screening cylinder 2 from front to back.
[0034] The driving component is fixedly installed on the support frame 1. The driving component drives the screening cylinder 2 to rotate on the support frame 1, and drives the pushing component to rotate on the support frame 1 in the direction opposite to the rotation direction of the screening cylinder 2.
[0035] The materials enter the front end of the screening cylinder 2 through the material guiding pipe. The driving component drives the screening cylinder 2 and the pushing component to rotate in opposite directions. The screening cylinder 2 performs multi-stage screening on the materials through different screening intervals. Taking three screening intervals as an example, the screening interval at the front side (left side) screens out the fine materials with small particle sizes, and the remaining materials roll towards the middle screening interval. The middle screening interval screens out the medium-sized materials with medium particle sizes, and the remaining materials continue to roll towards the rear side (right side) screening interval. The rear side screening interval screens out the coarse materials with large particle sizes, and the remaining materials with even larger particle sizes are finally conveyed outwards from the right end of the screening cylinder 2. Collection hoppers can be placed below each screening interval to collect the materials separately, thus completing the multi-stage screening of the materials.
[0036] Regarding the problem that the adhesion of wet materials causes difficulty in the rolling of materials, the present device introduces a pushing component. While the screening cylinder 2 screens the materials, the pushing component is used to push the materials forward, so that the materials participate in the screening work of each screening interval. It is also applicable to the materials with poor rolling effect in the screening cylinder 2. It can not only improve the screening effect of the materials, but also adapt to the screening work of different types of materials, greatly improving the adaptability.
[0037] Specifically, the pushing component includes a pushing shaft 3 and pushing plates 4. The axial direction of the pushing shaft 3 and the axial direction of the screening cylinder 2 are in the same plane. The pushing plates 4 are evenly fixed on the circumferential side wall of the pushing shaft 3 in a spiral shape. The pushing plates 4 are vertically inclined so as to Figure 5Taking the top view of the propulsion component as an example, the propulsion plate 4 is in an inclined state with the lower right (front end) pointing to the upper left (rear end). When the propulsion shaft 3 rotates counterclockwise and the propulsion plate 4 is about to rotate to the inner bottom wall of the screening cylinder 2, the front end of the propulsion plate 4 first contacts the material on the inner bottom wall of the screening cylinder 2. In the subsequent rotation process, the material will be pushed by the inclined side wall of the propulsion plate 4 and move toward the rear end of the propulsion plate 4, pushing the material to move a certain distance behind the screening cylinder 2. By setting multiple groups of propulsion plates 4, the material is continuously pushed, prompting the material to continuously move to the rear of the screening cylinder 2, so as to participate in the screening work between each screening area. The reverse rotation of the propulsion shaft 3 and the screening cylinder 2 can further improve the friction effect between the material and the screening cylinder 2, thereby better driving the material forward.
[0038] Specifically, the propulsion shaft 3 is located below the axis of the screening drum 2, and the bottom of the propulsion plate 4 is arc-shaped. The arc-shaped bottom of the propulsion plate 4 is tangent to the inner bottom wall of the screening drum 2 during rotation, and the contact position between the propulsion plate 4 and the screening drum 2 is limited to the inner bottom wall area of the screening drum 2, thereby reducing the wear on the inner wall of the screening drum 2 and increasing the service life of the screening drum 2.
[0039] Compared with the traditional method of setting a spiral or stepped material guide plate on the inner wall of the screening drum 2, the material will be carried by the material guide plate to a higher position of the screening drum 2 before falling due to gravity. This process will undoubtedly increase the gravitational potential energy of the material, thereby causing frequent and large external force impacts on the inner bottom wall of the screening drum 2, thereby aggravating the wear of the screening drum 2.
[0040] Specifically, among the two adjacent push plates 4, the front end of the rear push plate 4 is located within the rotation area of the front push plate 4, so that the rear push plate 4 can better connect with the materials pushed by the front push plate 4.
[0041] Specifically, the driving components include a driving motor 5, a driving shaft 6, a driving wheel 7, a driven shaft 8 and a driven wheel 9. The driving shaft 6 and the driven shaft 8 are arranged on both sides of the bottom of the screening drum 2, one on the left and the other on the right. The two ends of the driving shaft 6 and the driven shaft 8 are rotatably connected to the support frame 1. The driving wheel 7 is sleeved on both ends of the driving shaft 6, and the driven wheel 9 is sleeved on both ends of the driven shaft 8. The driving wheel 7 and the driven wheel 9 are clamped on both sides of the bottom of the screening drum 2 to support the screening drum 2. The output shaft of the driving motor 5 is coaxially connected with the driving shaft 6. The main rotating shaft and the driving wheel 7 are driven to rotate by the driving motor 5. The friction between the driving wheel 7 and the outer wall of the screening drum 2 drives the shaftless screening drum 2 to rotate, thereby realizing shaftless screening.
[0042] Specifically, the driving component is transmission-connected to the propulsion component via a linkage mechanism.
[0043] Specifically, the linkage mechanism includes a main pulley 10 and a secondary pulley 11. The main pulley 10 is sleeved on the driving shaft 6, and the secondary pulley 11 is sleeved on the propulsion shaft 3. The main pulley 10 and the secondary pulley 11 are connected by a transmission belt. The main pulley 10 drives the secondary pulley 11 to rotate synchronously in the same direction through the transmission belt, that is, the rotation direction of the propulsion shaft 3 is the same as that of the driving shaft 6. The driving wheel 7 drives the screening cylinder 2 to rotate in the opposite direction through the frictional effect, so as to realize the reverse rotation of the screening cylinder 2 and the propulsion shaft 3.
[0044] Specifically, a feed section 12 is provided at the front end of the screening cylinder 2, and a discharge section 13 is provided at the rear end of the screening cylinder 2. The screening section is located between the feed section 12 and the discharge section 13. The driving wheel 7 and the driven wheel 9 are respectively located below the feed section 12 and the discharge section 13. The side walls of the feed section 12 and the discharge section 13 are not provided with sieve holes to prevent materials from falling between the driving wheel 7 and the screening cylinder 2 and affecting the rotation effect.
[0045] Specifically, a pressure roller 14 parallel to and having the same orientation as the screening cylinder 2 is further provided on the support frame 1. The pressure roller 14 abuts against the outer side wall of the screening cylinder 2. The pressure roller 14 can be arranged in the upper region of the screening cylinder 2. By pressing the sieve holes on the surface of the screening cylinder 2 with the pressure roller 14, the materials stuck in the sieve holes are removed to keep the sieve holes unobstructed and further improve the screening effect.
[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A rotary sand and gravel screening device, comprising a support frame (1), characterized in that, Also includes: A shaftless screening drum (2) is rotatably mounted on the support frame (1); the screening drum is evenly provided with a plurality of screening sections along the axial direction; the sizes of the screen holes in different screening sections are different; A propulsion component is arranged inside the screening drum (2), with two ends of the propulsion component extending out of two ends of the screening drum (2) and being rotatably connected to the support frame (1), wherein the propulsion component can propel the material in the screening drum (2) from front to back when rotating; The driving component is fixedly mounted on the support frame (1), wherein the driving component drives the screening drum (2) to rotate on the support frame (1), and drives the propulsion component to rotate on the support frame (1) in the opposite direction to the rotation direction of the screening drum (2).
2. The rotary sand and gravel screening device according to claim 1, characterized in that, The propulsion component comprises a propulsion shaft (3) and a propulsion plate (4); the axial direction of the propulsion shaft (3) and the axial direction of the screening drum (2) are in the same plane; the propulsion plate (4) is evenly fixed on the circumferential side wall of the propulsion shaft (3) along a spiral shape; and the propulsion plate (4) is arranged vertically and tilted.
3. A rotary sand and gravel screening device according to claim 2, characterized in that, The propulsion shaft (3) is located below the axis of the screening drum (2); the bottom of the propulsion plate (4) is arc-shaped; and the arc-shaped bottom of the propulsion plate (4) is tangent to the inner bottom wall of the screening drum (2) during rotation.
4. A rotary sand and gravel screening device according to claim 2, characterized in that, In the two adjacent propulsion plates (4), the front end of the rear propulsion plate (4) is located within the rotation area of the front propulsion plate (4).
5. A rotary sand and gravel screening device according to claim 2, characterized in that, The driving component comprises a driving motor (5), a driving shaft (6), a driving wheel (7), a driven shaft (8) and a driven wheel (9); the driving shaft (6) and the driven shaft (8) are arranged on the left and right sides of the bottom of the screening drum (2); the two ends of the driving shaft (6) and the driven shaft (8) are rotatably connected to the support frame (1); the driving wheel (7) is sleeved on the two ends of the driving shaft (6); the driven wheel (9) is sleeved on the two ends of the driven shaft (8); the driving wheel (7) and the driven wheel (9) are clamped on the two sides of the bottom of the screening drum (2); and the output shaft of the driving motor (5) is coaxially connected to the driving shaft (6).
6. The rotary sand and gravel screening device according to claim 5, characterized in that, The driving component is transmission-connected with the propulsion component via a linkage mechanism.
7. The rotary sand and gravel screening device according to claim 6, wherein, The linkage mechanism comprises a main pulley (10) and a secondary pulley (11), wherein the main pulley (10) is sleeved on the driving shaft (6), and the secondary pulley (11) is sleeved on the propulsion shaft (3), and the main pulley (10) and the secondary pulley (11) are connected by a transmission belt.
8. A rotary sand and gravel screening device according to claim 5, characterized in that, The front end of the screening drum (2) is provided with a feeding section (12), and the rear end of the screening drum (2) is provided with a discharging section (13). The screening section is located between the feeding section (12) and the discharging section (13), and the driving wheel (7) and the driven wheel (9) are respectively located below the feeding section (12) and the discharging section (13).
9. The rotary sand and gravel screening device according to claim 1, wherein, The support frame (1) is also provided with a pressure roller (14) which is parallel to and faces the same direction as the screening drum (2), and the pressure roller (14) abuts against the outer side wall of the screening drum (2).
Citation Information
Patent Citations
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