Variable angle shaftless drum classifier

Abstract

The application discloses a variable-inclination shaftless drum-type classifier, and belongs to the technical field of engineering equipment. The shaftless drum-type classifier comprises symmetrically arranged supports, a base arranged at one end of the two supports, a fixed plate frame arranged on the base and the two supports, a multistage drum screening assembly arranged on the fixed plate frame, a feeding structure arranged at one end of the multistage drum screening assembly close to the base, and a discharging structure arranged at a position corresponding to the multistage drum screening assembly below the fixed plate frame. The variable-inclination shaftless drum-type classifier drives the multistage drum screening assembly through the mode that a driving transmission mechanism is in frictional contact with a rolling ring, so that the material winding problem that is prone to occurring when a traditional shafted drum-type classifier processes special materials can be avoided, and meanwhile, the inclination angle of the multistage drum screening assembly can be flexibly adjusted according to the characteristics of different materials through an inclination adjusting mechanism, so as to adapt to the requirements in diversified engineering scenes.

Description

Technical Field

[0001] This application relates to the field of engineering equipment technology, specifically to a shaftless roller classifier with variable tilt angle. Background Technology

[0002] In the material handling process in the engineering field, graded screening is a key step to ensure material quality and subsequent processing efficiency.

[0003] Traditional drum classifiers generally employ a shaft-type structure design. This design proves inadequate when handling special materials such as ribbons and fibers, as materials easily become entangled on the shaft, leading to frequent equipment failures. This not only significantly increases maintenance costs but also results in a substantial decrease in screening efficiency. Furthermore, the tilt angle of traditional classifiers is often fixed, making it difficult to flexibly adjust to the characteristics of different materials, such as particle size distribution, flowability, and moisture content. This makes it difficult to meet the needs of diverse engineering scenarios such as mining, construction, and environmental treatment. Especially in the mining sector, ore particle sizes vary greatly between different mining areas; in construction, the composition of construction waste is complex and varied; and in environmental treatment processes, the properties of waste materials are unpredictable. All of these present even more stringent challenges to the adaptability and responsiveness of classification equipment.

[0004] Therefore, this application provides a shaftless roller classifier with variable tilt angle to solve the above problems. Utility Model Content

[0005] This application provides a shaftless drum classifier with variable tilt angle, which aims to solve the problems mentioned in the background art, such as the existing drum classifiers with shaft design being prone to special materials getting entangled, frequent failures, high maintenance costs and low screening efficiency, and the fixed tilt angle making it difficult to adapt to different material characteristics and diverse engineering needs.

[0006] To achieve the above objectives, this application provides the following technical solution: a shaftless drum classifier with variable tilt angle, comprising symmetrically arranged supports, a base disposed at one end of the two supports, a fixed plate frame disposed on the base and the two supports, a multi-stage drum screening assembly disposed on the fixed plate frame, a feeding structure disposed on the multi-stage drum screening assembly near the base, and a discharge structure disposed on the fixed plate frame at a position corresponding to the lower position of the multi-stage drum screening assembly;

[0007] The shaftless drum classifier also includes a rolling ring fixedly disposed on the outside of the multi-stage drum screening assembly and a drive transmission mechanism disposed on the fixed plate frame for frictional contact with the rolling ring to rotate the multi-stage drum screening assembly.

[0008] The base is equipped with an inclination adjustment mechanism that connects to the fixed frame for adjusting the tilt angle of the multi-stage drum screening assembly. The multi-stage drum screening assembly is driven to rotate by frictional contact between the drive transmission mechanism and the rolling ring. This allows the power of the drive transmission mechanism to act directly on the rolling ring, thereby driving the entire multi-stage drum screening assembly to rotate. Power is not transmitted through a central shaft, eliminating the multi-stage drum screening assembly's dependence on a central shaft. This fundamentally avoids the material entanglement problem that easily occurs in traditional shafted drum classifiers when processing special materials such as ribbons and fibers. This not only reduces equipment downtime and maintenance costs but also significantly improves the stability and reliability of equipment operation. Furthermore, the inclination adjustment mechanism allows for flexible adjustment of the tilt angle of the multi-stage drum screening assembly according to the characteristics of different materials. This flexibility enables the classifier to adapt to the needs of diverse engineering scenarios such as mining, construction, and environmental treatment, improving classification efficiency and accuracy.

[0009] Preferably, to achieve multi-stage screening, the multi-stage drum screening assembly includes fixed rings symmetrically arranged on the fixed plate frame, and a primary screen cylinder, a secondary screen cylinder, and a tertiary screen cylinder sequentially arranged between two of the fixed rings and fixedly connected to each other. The aperture sizes of the primary, secondary, and tertiary screen cylinders decrease sequentially. Multiple roller rings are provided, and the multiple roller rings are respectively fixedly sleeved on the outside of the primary, secondary, and tertiary screen cylinders. By setting up primary, secondary, and tertiary screen cylinders that are sequentially connected and have progressively decreasing aperture sizes, multi-stage screening of materials can be achieved. This enables precise separation of materials according to different particle sizes, improves the grading accuracy and product quality of materials, meets the diverse needs of different industries for material particle sizes, and increases the utilization rate and added value of materials.

[0010] Preferably, to facilitate feeding for multi-stage screening, the feeding structure includes a feeding hopper disposed at one end of the fixed plate frame corresponding to the first-stage screen cylinder, and an inclined seat fixedly disposed at the four corners of the bottom of the feeding hopper and fixedly connected to the fixed plate frame. The feeding hopper is inclined towards the end closer to the first-stage screen cylinder. The inclined arrangement of the feeding hopper and its fixed connection to the fixed plate frame via the inclined seat facilitates the smooth entry of materials into the multi-stage drum screening assembly, reduces material accumulation and blockage during the feeding process, improves feeding efficiency, and ensures the continuity and stability of equipment operation.

[0011] Preferably, to facilitate multi-stage screening and discharge, the discharge structure includes discharge port one, discharge port two, and discharge port three, which are respectively fixedly disposed at the bottom of the fixed plate frame and located between the two supports. Discharge port one, discharge port two, and discharge port three are respectively disposed corresponding to the primary screen cylinder, the secondary screen cylinder, and the tertiary screen cylinder. By setting discharge port one, discharge port two, and discharge port three corresponding to the primary screen cylinder, secondary screen cylinder, and tertiary screen cylinder, it is possible to classify and collect materials of different particle sizes, which facilitates subsequent material processing and utilization, improves production efficiency, avoids mixing of materials of different particle sizes, and ensures product quality.

[0012] Preferably, to achieve the rotation of the multi-stage drum screening assembly, the drive transmission mechanism includes a drive shaft symmetrically rotatably connected to the fixed plate frame and located outside the multiple roller rings; drive friction wheels respectively fixedly sleeved on two of the drive shafts and linearly distributed axially for frictional contact with the outer sides of the multiple roller rings; a helical gear reducer motor fixedly installed on the fixed plate frame at a position corresponding to the lower position of the feed hopper; a dual-shaft worm gear reducer fixedly installed on the fixed plate frame and fixedly connected to the output shaft of the helical gear reducer motor; and two worm gear reversing mechanisms fixedly installed on the fixed plate frame and fixedly connected to the two output shafts of the dual-shaft worm gear reducer motor. The two worm gear reversing mechanisms are respectively fixedly connected to one end of the two drive shafts. The drive transmission mechanism, composed of the helical gear reducer motor, the dual-shaft worm gear reducer motor, and the worm gear reversing mechanisms, provides stable and suitable power, ensuring smooth rotation of the multi-stage drum screening assembly. Furthermore, the frictional contact method between the drive friction wheels and the roller rings is simple in structure and has high transmission efficiency.

[0013] Preferably, to ensure the stability of the multi-stage drum screening assembly's rotation, the drive transmission mechanism further includes a drive shaft symmetrically rotatably connected to the fixed plate frame and located outside the plurality of roller rings, and transmission friction wheels respectively fixedly sleeved on two of the drive shafts and arranged axially linearly for frictional contact with the outer sides of the plurality of roller rings. The two drive shafts and the two drive shafts are arranged in a cross-symmetrical distribution. The symmetrical arrangement of the drive shafts and transmission friction wheels, and their cross-symmetrical distribution with the drive shafts and drive friction wheels, can increase the stability of the multi-stage drum screening assembly's rotation, reduce swaying and offset during rotation, and improve the reliability and safety of equipment operation.

[0014] Preferably, to achieve the adjustment of the tilt angle of the multi-stage drum screening assembly, the tilt angle adjustment mechanism includes bearing seats fixedly mounted on the two supports, two support shafts fixedly connected to both sides of the fixed plate frame and rotatably connected to the two bearing seats, connecting blocks symmetrically fixedly mounted on the bottom of the fixed plate frame near the base, sliding grooves respectively opened on the two connecting blocks, hinge shafts slidably connected in the two sliding grooves, a drive motor fixedly mounted on the base, a worm gear reversing mechanism II fixedly mounted on the base and fixedly connected to the output shaft of the drive motor, and a worm gear reversing mechanism II fixedly mounted on the base and connected to the output shaft of the drive motor. The system includes a dual-shaft worm gear reducer II with its output shaft fixedly connected, and two worm gear screw jacks fixedly mounted on the base and respectively fixedly connected to the two output shafts of the dual-shaft worm gear reducer II. The screws on the two worm gear screw jacks are respectively fixedly connected to the ends of the two hinge shafts away from the slide groove. By starting the drive motor and using the worm gear reducer II and the dual-shaft worm gear reducer II to drive the two worm gear screw jacks to work, the screws on the worm gear screw jacks can drive the hinge shafts to slide in the slide groove. This allows the connecting block to drive the fixed plate frame to rotate around the support shaft, thereby realizing the adjustment of the tilt angle of the multi-stage drum screening assembly. The operation is simple and convenient.

[0015] This variable-angle shaftless drum classifier drives the multi-stage drum screening assembly to rotate through frictional contact between the drive transmission mechanism and the roller ring. This allows the power of the drive transmission mechanism to act directly on the roller ring, thereby driving the entire multi-stage drum screening assembly to rotate. There is no need to transmit power through a central shaft, eliminating the dependence of the multi-stage drum screening assembly on a central shaft. This fundamentally avoids the material entanglement problem that easily occurs when traditional shafted drum classifiers process special materials such as strips and fibers. This not only reduces equipment downtime and maintenance costs, but also significantly improves the stability and reliability of equipment operation.

[0016] This variable-angle shaftless drum classifier, by setting an angle adjustment mechanism, can flexibly adjust the tilt angle of the multi-stage drum screening components according to the characteristics of different materials. This flexibility enables the classifier to adapt to the needs of diverse engineering scenarios such as mining, construction, and environmental protection, thereby improving classification efficiency and accuracy.

[0017] This variable-angle shaftless drum classifier achieves multi-stage screening of materials by setting up a primary, secondary, and tertiary sieve cylinder connected in sequence with decreasing aperture sizes. It can accurately separate materials according to different particle sizes, improve the grading accuracy and product quality, and meet the diverse needs of different industries for material particle size. Attached Figure Description

[0018] Figure 1This is a schematic diagram of a shaftless roller classifier with variable tilt angle;

[0019] Figure 2 This is a schematic diagram of a shaftless roller classifier with variable tilt angle when the feeding and discharging structures are not installed.

[0020] Figure 3 This is a schematic diagram of the tilt angle adjustment mechanism in a shaftless roller classifier with variable tilt angle.

[0021] Figure 4 This is a schematic diagram of the connecting block and hinge shaft in a shaftless roller classifier with variable tilt angle.

[0022] In the diagram: 1. Base; 11. Bracket; 2. Fixed plate frame; 3. Multi-stage drum screening assembly; 31. Fixing ring; 32. Primary screen cylinder; 33. Secondary screen cylinder; 34. Tertiary screen cylinder; 4. Feeding structure; 41. Inclined seat; 42. Feed hopper; 5. Discharge structure; 51. Discharge port one; 52. Discharge port two; 53. Discharge port three; 6. Rolling ring; 7. Drive transmission mechanism; 71. Drive shaft; 72. Drive friction. 73. Helical gear reducer motor; 74. Dual-shaft worm gear reducer I; 75. Worm gear reversing mechanism I; 76. Drive shaft; 77. Drive friction wheel; 8. Tilt adjustment mechanism; 81. Bearing housing; 82. Support shaft; 83. Connecting block; 84. Slide groove; 85. Hinge shaft; 86. Worm gear screw jack; 87. Dual-shaft worm gear reducer II; 88. Worm gear reversing mechanism II; 89. Drive motor. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] This embodiment provides a shaftless drum classifier with a variable tilt angle, such as... Figures 1-4As shown, the shaftless drum classifier includes symmetrically arranged supports 11, a base 1 at one end of the two supports 11, a fixed frame 2 on the base 1 and the two supports 11, a multi-stage drum screening assembly 3 on the fixed frame 2, a feeding structure 4 on the multi-stage drum screening assembly 3 near the base 1, and a discharge structure 5 on the fixed frame 2 corresponding to the position below the multi-stage drum screening assembly 3. The shaftless drum classifier also includes a rolling ring 6 fixedly arranged on the outside of the multi-stage drum screening assembly 3 and a drive transmission mechanism 7 arranged on the fixed frame 2 for frictional contact with the rolling ring 6 to rotate the multi-stage drum screening assembly 3. The base 1 is provided with an inclination adjustment mechanism 8 connected to the fixed frame 2 for adjusting the inclination angle of the multi-stage drum screening assembly 3.

[0025] In use, the material is fed into the feeding structure 4. Because the feeding structure 4 is located close to the multi-stage drum screening assembly 3 and near one end of the base 1, the material can smoothly enter the multi-stage drum screening assembly 3. At the same time, the drive transmission mechanism 7 is activated, which will make frictional contact with the rolling ring 6 fixed on the outside of the multi-stage drum screening assembly 3. The power generated by the frictional contact between the drive transmission mechanism 7 and the rolling ring 6 can drive the multi-stage drum screening assembly 3 to start rotating. Since the power acts directly on the rolling ring 6 to drive the multi-stage drum screening assembly 3 to rotate, the multi-stage drum screening assembly 3 does not need to pass through the center. The shaft is used to transmit power, avoiding the entanglement problem that traditional shafted drum classifiers encounter when processing special materials such as strips and fibers. However, during the rotation of the multi-stage drum screening component 3, the material is tumbled inside the multi-stage drum screening component 3 to achieve multi-stage screening. Furthermore, when using this shaftless drum classifier, the tilt angle adjustment mechanism 8 can be operated according to the characteristics of different materials to flexibly adjust the tilt angle of the multi-stage drum screening component 3 to optimize the screening effect. Finally, the screened material is discharged from the discharge structure 5, thus completing the entire multi-stage screening process.

[0026] Specifically, the multi-stage drum screening assembly 3 includes fixed rings 31 symmetrically arranged on the fixed plate frame 2, a first-stage screen cylinder 32, a second-stage screen cylinder 33, and a third-stage screen cylinder 34 arranged sequentially between the two fixed rings 31 and fixedly connected to each other. The aperture size on the first-stage screen cylinder 32, the second-stage screen cylinder 33, and the third-stage screen cylinder 34 decreases sequentially. Multiple roller rings 6 are provided, and the multiple roller rings 6 are respectively fixedly sleeved on the outside of the first-stage screen cylinder 32, the second-stage screen cylinder 33, and the third-stage screen cylinder 34.

[0027] After the material enters the multi-stage drum screening assembly 3, the primary screen cylinder 32, secondary screen cylinder 33, and tertiary screen cylinder 34 in the multi-stage drum screening assembly 3 are symmetrically arranged on the fixed plate frame 2 and fixedly connected to each other through fixed rings 31. When the drive transmission mechanism 7 drives the rolling rings 6 to rotate, multiple rolling rings 6, which are respectively fixedly sleeved on the outside of the primary screen cylinder 32, secondary screen cylinder 33, and tertiary screen cylinder 34, rotate synchronously, thereby driving the entire drum screening assembly 3 to rotate. The material then tumbles inside the primary screen cylinder 32, secondary screen cylinder 33, and tertiary screen cylinder 34. Furthermore, due to the rotation of the primary screen cylinder 32, secondary screen cylinder 33, and tertiary screen cylinder 34... The aperture sizes decrease sequentially. Therefore, during the tumbling process, materials with a particle size smaller than the aperture of the primary screen 32 pass through the primary screen 32 first. Materials with a particle size between the apertures of the primary screen 32 and the secondary screen 33 pass through the secondary screen 33 as they continue to tumble. Materials with a particle size between the apertures of the secondary screen 33 and the tertiary screen 34 pass through the tertiary screen 34 as they tumble. Materials with a particle size larger than the aperture of the tertiary screen 34 remain and are discharged through the fixed ring 31 at the end away from the feed structure 4, thus achieving multi-stage screening of the material.

[0028] It should be noted that the inner walls of the primary screen cylinder 32, the secondary screen cylinder 33, and the tertiary screen cylinder 34 are all fixedly equipped with spiral guide plates. The spiral angle of the spiral guide plates is 25°-35°. With this design, when the drum screening assembly 3 rotates, the material will move along a specific path under the guidance of the spiral guide plates, so that the material will continuously tumble and stir in the primary screen cylinder 32, the secondary screen cylinder 33, and the tertiary screen cylinder 34, and make full contact with the screen holes of the primary screen cylinder 32, the secondary screen cylinder 33, and the tertiary screen cylinder 34. At the same time, it can also more efficiently transport the material from the feed end of the primary screen cylinder 32 to the discharge end of the fixed ring 31 away from the feed structure 4, avoid excessive accumulation of material in a certain area, and improve the material conveying efficiency of the overall screening process.

[0029] To facilitate multi-stage screening, the feeding structure 4 includes a feeding hopper 42 located at one end of the fixed frame 2 corresponding to the first-stage screen cylinder 32, and an inclined seat 41 fixedly located at the corners of the bottom of the feeding hopper 42 and fixedly connected to the fixed frame 2. The feeding hopper 42 is inclined towards the end closer to the first-stage screen cylinder 32. When material is poured into the feeding hopper 42, due to the inclination of the feeding hopper 42 towards the end closer to the first-stage screen cylinder 32, the material will slide into the first-stage screen cylinder 32 under the action of gravity. Then, as the multi-stage drum screening assembly 3 rotates, the material will rotate sequentially into the second-stage screen cylinder 33 and the third-stage screen cylinder 34 for screening, reducing the accumulation and blockage of material during the feeding process, improving the feeding efficiency, and ensuring the continuity and stability of equipment operation.

[0030] In addition, to facilitate the discharge of materials from multi-stage screening, the discharge structure 5 includes discharge port 1 51, discharge port 2 52, and discharge port 3 53, which are respectively fixedly installed at the bottom of the fixed plate frame 2 and located between the two supports 11. Discharge port 1 51, discharge port 2 52, and discharge port 3 53 are respectively set to correspond to the first-stage screen cylinder 32, the second-stage screen cylinder 33, and the third-stage screen cylinder 34. After the material undergoes multi-stage screening in the multi-stage drum screening assembly 3, materials of different particle sizes can be discharged from discharge port 1 51, discharge port 2 52, and discharge port 3 53, which are respectively set to correspond to the first-stage screen cylinder 32, the second-stage screen cylinder 33, and the third-stage screen cylinder 34. This design can realize the classified collection of materials of different particle sizes, which facilitates subsequent material processing and utilization, improves production efficiency, avoids the mixing of materials of different particle sizes, and ensures product quality.

[0031] Furthermore, the drive transmission mechanism 7 includes drive shafts 71 symmetrically rotatably connected to the fixed plate frame 2 and located outside the multiple rolling rings 6; drive friction wheels 72 respectively fixedly sleeved on two drive shafts 71 and axially linearly distributed for frictional contact with the outside of the multiple rolling rings 6; a helical gear reducer motor 73 fixedly installed on the fixed plate frame 2 at a position corresponding to the lower position of the feed hopper 42; a dual-shaft worm gear reducer 74 fixedly installed on the fixed plate frame 2 and fixedly connected to the output shaft of the helical gear reducer motor 73; and a mechanism fixedly installed on the fixed plate frame 2. Two worm gear reversing mechanisms 75 are fixedly connected to the two output shafts of the dual-shaft worm gear reducer 74, and the two worm gear reversing mechanisms 75 are fixedly connected to one end of the two drive shafts 71. The drive transmission mechanism 7 also includes a drive shaft 76 symmetrically rotatably connected to the fixed plate frame 2 and located outside the multiple rolling rings 6, and a transmission friction wheel 77 fixedly sleeved on the two drive shafts 76 and axially linearly distributed for frictional contact with the outside of the multiple rolling rings 6. The two drive shafts 76 and the two drive shafts 71 are symmetrically distributed in a cross shape.

[0032] When materials need to be conveyed through the feeding structure 4 to the multi-stage drum screening assembly 3, the helical gear reducer motor 73 can be started. At this time, its output shaft will drive the dual-shaft worm gear reducer 74 fixedly connected to it to rotate. Then, the dual-shaft worm gear reducer 74 will transmit power to the two worm gear reversing machines 75 through the two output shafts respectively. The two worm gear reversing machines 75 will drive the two drive shafts 71 fixedly connected to them to rotate symmetrically on the fixed plate frame 2. Since the two drive shafts 71 are provided with drive friction wheels 72 that are linearly distributed axially, the drive friction wheels 72 are in frictional contact with the rolling rings 6. Therefore, as the two drive shafts 71 rotate, multiple drive friction wheels 72 can fully rub against the outer side of multiple rolling rings 6, thereby driving the drive shafts 71 to rotate symmetrically. The rotational power of 1 is transmitted to the roller rings 6, and multiple roller rings 6 are fixedly sleeved on the outside of the primary screen cylinder 32, the secondary screen cylinder 33, and the tertiary screen cylinder 34. Therefore, as multiple roller rings 6 rotate, the primary screen cylinder 32, the secondary screen cylinder 33, and the tertiary screen cylinder 34 can rotate synchronously, thereby enabling the entire drum screening assembly 3 to rotate stably and achieve material screening. However, while multiple roller rings 6 are rotating, the fixed plate frame 2 is equipped with symmetrical transmission shafts 76, and each transmission shaft 76 is equipped with multiple transmission friction wheels 77 that rub against the outside of the roller rings 6. The two transmission shafts 76 and the two drive shafts 71 are arranged in a cross-shaped symmetrical distribution. Thus, when multiple roller rings 6 rotate, the friction transmission through the transmission friction wheels 77 can further ensure the stability of the rotation of the primary screen cylinder 32, the secondary screen cylinder 33, and the tertiary screen cylinder 34.

[0033] Furthermore, the tilt adjustment mechanism 8 includes bearing seats 81 fixedly mounted on two brackets 11, two support shafts 82 fixedly connected to both sides of the fixed plate frame 2 and rotatably connected to the two bearing seats 81, connecting blocks 83 symmetrically fixedly mounted at the bottom of the fixed plate frame 2 near the base 1, slide grooves 84 respectively opened on the two connecting blocks 83, hinge shafts 85 respectively slidably connected in the two slide grooves 84, a transmission motor 89 fixedly mounted on the base 1, a worm gear reversing mechanism 88 fixedly mounted on the base 1 and fixedly connected to the output shaft of the transmission motor 89, a double-shaft worm gear reducer 87 fixedly mounted on the base 1 and fixedly connected to the output shaft of the double-shaft worm gear reducer 88, and two worm gear screw jacks 86 fixedly mounted on the base 1 and fixedly connected to the two output shafts of the double-shaft worm gear reducer 87. The screws on the two worm gear screw jacks 86 are fixedly connected to the ends of the two hinge shafts 85 away from the slide grooves 84.

[0034] When it is necessary to adjust the tilt angle of the drum screening assembly 3, the drive motor 89, which is fixedly mounted on the base 1, is started. Its output shaft drives the worm gear reversing mechanism 88, which is fixedly connected to it, to rotate. Then, the worm gear reversing mechanism 88 transmits power to the dual-shaft worm gear reducer 87, which is fixedly mounted on the base 1 and fixedly connected to its output shaft. Subsequently, the dual-shaft worm gear reducer 87 synchronously drives the two worm screw jacks 86, which are fixedly mounted on the base 1, to work, so that the screws on the two worm screw jacks 86 respectively... When moving up or down, the screw is fixedly connected to the hinge shaft 85 in the groove 84 of two symmetrically arranged connecting blocks 83 on the bottom side of the fixed plate frame 2 near the base 1. The movement of the screw will cause the hinge shaft 85 to slide in the groove 84. The two sides of the fixed plate frame 2 are rotatably connected to the bearing seats 81 fixedly installed on the two brackets 11 through the support shaft 82. Under the push or pull of the hinge shaft 85, the fixed plate frame 2 can rotate around the support shaft 82, thereby realizing the adjustment of the tilt angle of the drum screening assembly 3.

[0035] Understandably, the helical gear reducer motor 73 consists of a motor and a helical gear reducer. When the motor is powered on, the rotor rotates and converts electrical energy into mechanical energy. Its output shaft drives the active helical gear of the helical gear reducer to rotate. Because the helical gear tooth surface is inclined, the active helical gear drives the driven helical gear to rotate, realizing the conversion from high-speed rotational motion to low-speed, high-torque rotational motion, and providing power for the drive transmission mechanism 7.

[0036] The dual-shaft worm gear reducer 74 is mainly composed of a worm and a worm wheel. When the output shaft of the helical gear reducer motor 73 drives the input worm of the reducer 74 to rotate, the worm meshes with the worm wheel, further reducing the speed and increasing the torque. The power is then transmitted to the worm gear reversing machine 75 through the two output shafts to meet the power requirements of the subsequent transmission components.

[0037] The worm gear reversing mechanism 75 consists of a worm wheel and a worm. When the output shaft of the dual-shaft worm gear reducer 74 drives its input worm to rotate, the worm meshes with the worm wheel to make the worm wheel rotate. By changing the installation position and transmission relationship of the worm wheel and worm, the power transmission direction is changed, and the power is transmitted to the two drive shafts 71 respectively, making them rotate symmetrically. This drives the drive friction wheel 72 to rub against the rolling ring 6, driving the drum screening assembly 3 to rotate.

[0038] The worm gear screw jack 86 consists of a worm gear, a worm, and a screw. When the output shaft of the dual-shaft worm gear reducer 87 drives its input worm to rotate, the worm meshes with the worm gear, causing the worm gear to rotate. The worm gear drives the screw to move linearly through the threaded hole. The lifting and lowering of the screw causes the hinge shaft 85 to slide in the slide groove 84, pushing or pulling the fixed plate frame 2 to rotate around the support shaft 82, thereby adjusting the tilt angle of the drum screening assembly 3.

[0039] The working principle of the dual-shaft worm gear reducer 287 is similar to that of the dual-shaft worm gear reducer 174. The output shaft of the transmission motor 89 drives the worm gear reversing machine 288 to rotate. The worm gear reversing machine 288 transmits power to its input worm, and then drives the two worm gear screw jacks 86 to work through the two output shafts respectively.

[0040] The working principle of the worm gear reversing machine 288 is the same as that of the worm gear reversing machine 175. The output shaft of the transmission motor 89 drives its input worm to rotate. The worm meshes with the worm wheel to make the worm wheel rotate. After adjusting the direction of the power output by the transmission motor 89, it is transmitted to the dual-shaft worm gear reducer 287.

[0041] Contents not described in detail in this specification are existing technologies known to those skilled in the art. Standard parts used in this invention can all be purchased commercially, and irregularly shaped parts can be custom-made according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are already mature technologies. The machinery, parts, and equipment all use conventional models from the prior art, and the circuit connections also employ conventional connection methods from the prior art, which will not be detailed here.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shaftless drum classifier with variable tilt angle, comprising symmetrically arranged supports (11), a base (1) disposed at one end of the two supports (11), a fixed plate frame (2) disposed on the base (1) and the two supports (11), a multi-stage drum screening assembly (3) disposed on the fixed plate frame (2), a feeding structure (4) disposed on the multi-stage drum screening assembly (3) near the end of the base (1), and a discharge structure (5) disposed on the fixed plate frame (2) at a position corresponding to the lower position of the multi-stage drum screening assembly (3); characterized in that The shaftless drum classifier also includes a rolling ring (6) fixedly disposed on the outside of the multi-stage drum screening assembly (3) and a drive transmission mechanism (7) disposed on the fixed plate frame (2) for frictional contact with the rolling ring (6) to make the multi-stage drum screening assembly (3) rotate. The base (1) is provided with an inclination adjustment mechanism (8) that is connected to the fixed plate frame (2) for adjusting the tilt angle of the multi-stage drum screening assembly (3).

2. The variable-inclination shaftless drum classifier according to claim 1, wherein: The multi-stage drum screening assembly (3) includes fixed rings (31) symmetrically arranged on the fixed plate frame (2), a first-stage screen cylinder (32), a second-stage screen cylinder (33), and a third-stage screen cylinder (34) arranged sequentially between the two fixed rings (31) and fixedly connected to each other. The aperture size of the first-stage screen cylinder (32), the second-stage screen cylinder (33), and the third-stage screen cylinder (34) decreases sequentially. Multiple roller rings (6) are provided, and the multiple roller rings (6) are respectively fixedly sleeved on the outside of the first-stage screen cylinder (32), the second-stage screen cylinder (33), and the third-stage screen cylinder (34).

3. The variable-inclination shaftless drum classifier according to claim 2, wherein: The feeding structure (4) includes a feeding hopper (42) disposed on the fixed plate frame (2) at one end corresponding to the first-stage screen cylinder (32) and an inclined seat (41) fixedly disposed at the four corners of the bottom of the feeding hopper (42) and fixedly connected to the fixed plate frame (2). The feeding hopper (42) is inclined towards the end closer to the first-stage screen cylinder (32).

4. The variable-inclination shaftless drum classifier of claim 2, wherein: The discharge structure (5) includes discharge port one (51), discharge port two (52) and discharge port three (53) respectively fixedly disposed at the bottom of the fixed plate frame (2) and located between the two supports (11). The discharge port one (51), discharge port two (52) and discharge port three (53) are respectively disposed corresponding to the first-stage screen cylinder (32), the second-stage screen cylinder (33) and the third-stage screen cylinder (34).

5. The variable tilt angle shaftless drum classifier according to claim 3, characterized in that: The drive transmission mechanism (7) includes a drive shaft (71) symmetrically rotatably connected to the fixed plate frame (2) and located outside the multiple rolling rings (6); drive friction wheels (72) respectively fixedly sleeved on the two drive shafts (71) and linearly distributed axially for frictional contact with the outside of the multiple rolling rings (6); a helical gear reducer motor (73) fixedly installed on the fixed plate frame (2) at a position corresponding to the lower position of the feed hopper (42); a dual-shaft worm gear reducer (74) fixedly installed on the fixed plate frame (2) and fixedly connected to the output shaft of the helical gear reducer motor (73); and two worm gear reversing mechanisms (75) fixedly installed on the fixed plate frame (2) and fixedly connected to the two output shafts of the dual-shaft worm gear reducer (74). The two worm gear reversing mechanisms (75) are respectively fixedly connected to one end of the two drive shafts (71).

6. The variable-inclination shaftless drum classifier according to claim 5, wherein: The drive transmission mechanism (7) further includes a drive shaft (76) symmetrically rotatably connected to the fixed plate frame (2) and located outside the plurality of rolling rings (6), and a transmission friction wheel (77) fixedly sleeved on the two drive shafts (76) and axially linearly distributed for frictional contact with the outside of the plurality of rolling rings (6). The two drive shafts (76) and the two drive shafts (71) are arranged in a cross-shaped symmetrical distribution.

7. The variable-inclination shaftless drum classifier of claim 1, wherein: The tilt adjustment mechanism (8) includes bearing seats (81) fixedly mounted on the two brackets (11), two support shafts (82) fixedly connected to both sides of the fixed plate frame (2) and rotatably connected to the two bearing seats (81), connecting blocks (83) symmetrically fixedly arranged at the bottom of the fixed plate frame (2) near the base (1), sliding grooves (84) respectively opened on the two connecting blocks (83), hinge shafts (85) slidably connected in the two sliding grooves (84), a drive motor (89) fixedly mounted on the base (1), and a fixed mounting mechanism. The base (1) includes a worm gear reversing mechanism 2 (88) fixedly connected to the output shaft of the transmission motor (89), a dual-shaft worm gear reducer 2 (87) fixedly mounted on the base (1) and fixedly connected to the output shaft of the worm gear reversing mechanism 2 (88), and two worm screw jacks (86) fixedly mounted on the base (1) and fixedly connected to the two output shafts of the dual-shaft worm gear reducer 2 (87). The screws on the two worm screw jacks (86) are fixedly connected to the ends of the two hinge shafts (85) away from the slide groove (84).

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