A pre-screening device for mineral beneficiation

Abstract

The utility model belongs to mineral processing technical field especially is concerned about a kind of ore dressing pre-screening device, including frame and screening box body, the inner wall rotationally connected of screening box body has several groups of obliquely arranged screening roller shaft, the axial both ends of screening roller shaft are fixedly connected with transmission shaft head and support shaft head, the shaft shoulder of transmission shaft head is connected with plane bearing, the stationary end of plane bearing is connected with thrust ring, the outer end fixedly connected of thrust ring has guide pipe, guide pipe outer wall is sleeved with several axial series disc spring, guide pipe outer wall is equipped with the wedge-shaped block that distributes evenly in circumference, wedge-shaped block is connected in the wedge-shaped guide groove inside the wedge-shaped guide cylinder and is opened, by plane bearing carries axial thrust, disc spring group compensates axial hunting, wedge-shaped block mechanism realizes the effective transmission of force, effectively solve the problem that traditional screening equipment bearing is eccentric and service life is short, significantly improve equipment operation stability and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of mineral processing technology, and in particular relates to a mineral processing pre-screening device. Background Technology

[0002] Crushing is a crucial process in mineral processing plants, and its output and quality significantly impact subsequent grinding and beneficiation operations. Due to blasting and transportation during mining, raw ore exhibits significant particle size variations, meaning coarse ore particles are exceptionally large while fine particles are smaller, resulting in a wide particle size range. Generally, ore cannot be directly fed into primary crushing; instead, screening equipment is required to classify the coarse and fine particles. Coarse particles are fed into primary crushing machinery for further crushing, while fine particles are directly transported to secondary crushing machinery for further fine crushing—a process known as pre-screening.

[0003] During the screening process, the shaft rollers are subjected to complex axial thrust and torsional vibration loads. Although traditional radial bearings have a certain axial load capacity, under the complex load conditions of mineral processing, the axial load margin is insufficient, which easily leads to severe uneven wear at the contact surface between the bearing inner ring and the shaft shoulder, especially the phenomenon of "undercut indentation". At the same time, the axial clearance inside the bearing causes a large axial movement of the shaft roller, further aggravating uneven wear and drastically shortening the service life of the bearing. Utility Model Content

[0004] In view of the technical problems existing in the background art, this utility model provides a mineral processing pre-screening device, which effectively solves the technical defects of traditional screening equipment by using a plane bearing to bear axial thrust, a disc spring group to compensate for axial movement, and a wedge block mechanism to achieve effective force transmission.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A mineral processing pre-screening device includes a frame and a screening box. The inner wall of the screening box is rotatably connected to several sets of inclined screening rollers. Both ends of the screening rollers are fixedly connected to a drive shaft head and a support shaft head. A plane bearing is snapped into the shoulder of the drive shaft head and the support shaft head respectively, and the rotating end of the plane bearing abuts against the drive shaft head and the support shaft head respectively. A thrust ring is snapped into the stationary end of the plane bearing. A guide tube is fixedly connected to the outer end of the thrust ring. Several axially connected disc springs are sleeved on the outer wall of the guide tube. The disc springs are stacked sequentially along the axial direction of the guide tube. A wedge-shaped assembly is provided on the outer wall of the guide tube. The wedge-shaped assembly is used for the decomposition and transmission of axial force.

[0006] Optionally, the wedge assembly includes wedge blocks evenly distributed circumferentially along the outer wall of the guide tube, with one end of the wedge block near the disc spring abutting against the disc spring. A wedge guide cylinder is sleeved on the outer wall of the guide tube, and several wedge guide grooves matching the wedge blocks are opened inside the wedge guide cylinder. A support ring is fixedly connected to the inner wall of the wedge guide cylinder, and the extension of the wedge guide cylinder is fixedly connected to the outer wall of the screening box through a flange.

[0007] Optionally, a dynamic dustproof disc is fixedly connected to the rotating end of the plane bearing, and a number of equally spaced dynamic dustproof rings are fixedly connected to the inner wall of the dynamic dustproof disc. A static dustproof disc is fixedly connected to the end of the thrust ring near the screening box, and a number of equally spaced static dustproof rings are fixedly connected to the inner wall of the static dustproof disc. The dynamic dustproof rings and static dustproof rings are arranged alternately along the axial direction and maintain a non-contact gap.

[0008] Optionally, a support plate is fixedly connected to the outer wall of the screening box, and several equally spaced bearing seats are fixedly connected to the top of the support plate. The bearing seats are rotatably connected to the drive shaft head through bearings.

[0009] Optionally, it also includes a double-row chain drive mechanism, which includes two axially spaced first and second drive sprockets fixedly connected to the outer end of the drive shaft head. The first drive sprockets of adjacent shaft rollers are rotatably connected by a first drive chain to form a first drive chain system, and the second drive sprockets of adjacent shaft rollers are rotatably connected by a second drive chain to form a second drive chain system. The first drive chain and the second drive chain are axially staggered.

[0010] Optionally, a drive motor is fixedly connected to the top of the support plate, and the output shaft of the drive motor is rotatably connected to the first drive sprocket at the end via a transmission chain.

[0011] Optionally, the outer wall of the screening box is fixedly connected with a buckle, the outer end of which is engaged with a dustproof shell, and the bottom end of the dustproof shell is engaged with a support plate.

[0012] Optionally, a feed hopper is fixedly connected to the feed end of the screening box, a chute is fixedly connected to the inner wall of the feed hopper, a discharge hopper is fixedly connected to the discharge end of the screening box, and a fine ore collection box is fixedly connected to the bottom end of the screening box.

[0013] This utility model has the following advantages and beneficial effects: In this invention, the pre-screening device for mineral processing adopts a load separation design with a division of labor between planar bearings and radial bearings. The planar bearings are specifically designed to bear axial thrust, while the radial bearings are specifically designed to bear radial loads. The disc spring assembly compensates for axial movement in real time and transmits elastic force to the frame through wedge blocks. The wedge guide groove guides the movement of the wedge blocks and realizes the decomposition and transmission of force. This screening device effectively solves the problem of bearing wear caused by axial movement in traditional equipment through specialized load division and elastic support technology, thus extending the service life of the bearings. Compared with the traditional roller screen with a single radial bearing, the multi-stage load separation and elastic force transmission mechanism improve the stability and reliability of equipment operation, reduce maintenance downtime, and significantly improve overall economic benefits. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the mineral processing pre-screening device of this utility model; Figure 2 This is a top view of the mineral processing pre-screening device of this utility model; Figure 3 This utility model Figure 2 A cross-sectional view along the AA direction; Figure 4 This utility model Figure 2 A cross-sectional view along the BB direction; Figure 5 This utility model Figure 3 A magnified view of a section at point C; Figure 6 This utility model Figure 3 Enlarged view of a section at point D; Figure 7 This is a partial view of the mineral processing pre-screening device of this utility model.

[0015] Reference numerals in the attached drawings: 1. Frame; 2. Screening box; 3. Screening roller; 4. Drive shaft head; 5. Support shaft head; 6. Surface bearing; 7. Thrust ring; 8. Guide tube; 9. Disc spring; 10. Wedge block; 11. Wedge guide cylinder; 12. Wedge guide groove; 13. Support ring; 14. Moving dustproof disc; 1401. Moving dustproof ring; 15. Static dustproof disc; 1501. Static dustproof ring; 16. Support plate; 17. Bearing seat; 18. First drive sprocket; 19. Second drive sprocket; 20. Drive motor; 21. Buckle; 22. Dustproof housing; 23. Feed hopper; 24. Slide; 25. Discharge hopper; 26. Fine ore collection box. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Example like Figures 1-3 and Figure 5 As shown, a mineral processing pre-screening device includes a frame 1 and a screening box 2. The screening box 2 is set at an overall inclination, with an inclination angle of 8-12 degrees, to ensure that the material flows smoothly under the action of gravity, obtain the best screening effect, and ensure that the material passes through each screening area in an orderly manner.

[0019] The inner wall of the screening box 2 is rotatably connected to multiple sets of inclined screening rollers 3. The axial spacing of each screening roller 3 is evenly distributed to realize the orderly conveying and efficient screening of materials. Both ends of the screening roller 3 are fixedly connected to a drive shaft head 4 and a support shaft head 5. The drive shaft head 4 undertakes the power transmission function, and the support shaft head 5 undertakes the radial support function to ensure the smooth operation of the roller.

[0020] A flat bearing 6 is snapped into the shoulder of the drive shaft head 4 to bear the axial load. Traditional screening equipment uses radial bearings to bear both radial and axial loads, which leads to bearing overload and uneven wear. However, this solution divides the load so that the flat bearing can bear the axial thrust specifically, which greatly extends the service life.

[0021] The rotating end of the plane bearing 6 abuts against the drive shaft head 4 and rotates synchronously with the shaft roller. The stationary end is clamped with a thrust ring 7. The thrust ring 7 transmits the axial force borne by the plane bearing 6 to the subsequent elastic support system. The thrust ring 7 is made of high-strength steel to ensure that it does not deform under heavy loads.

[0022] The outer end of the thrust ring 7 is fixedly connected to a guide tube 8. The main function of the guide tube 8 is to provide guidance and installation foundation for the disc spring assembly. Several axially connected disc springs 9 are sleeved on the outer wall of the guide tube 8. The disc springs 9 are stacked sequentially along the axial direction of the guide tube 8. The disc spring assembly is the core component of the axial movement compensation system. Its unique quasi-constant load characteristics enable it to maintain a relatively stable load output within a large displacement range. When the shaft roller moves axially, the disc spring assembly can follow in real time and provide restoring force, controlling the movement amplitude within a very small range, effectively protecting the plane bearing 6 and the radial bearing from impact loads.

[0023] like Figure 7 As shown, the outer wall of the guide tube 8 is provided with circumferentially evenly distributed wedge blocks 10. The end of the wedge block 10 close to the disc spring 9 abuts against the disc spring 9. The wedge block 10 is a key component for force transmission and decomposition. Its wedge design can decompose the axial force of the disc spring into axial and radial components, thereby realizing the effective transmission of force.

[0024] A wedge-shaped guide cylinder 11 is sleeved on the outer wall of the guide tube 8. The wedge-shaped guide cylinder 11 has several wedge-shaped guide grooves 12 that match the wedge blocks 10. The wedge-shaped guide grooves 12 provide a precise movement trajectory for the wedge blocks 10, ensuring that the force transmission direction is correct. When the disc spring assembly undergoes axial displacement, the wedge blocks 10 slide along the wedge-shaped guide grooves 12, and the axial force is decomposed and transmitted to the wedge-shaped guide cylinder 11 through the wedge surface, and then transmitted to the screening box, forming a complete force transmission chain. While allowing axial movement, the load is stably transmitted, which not only ensures the axial displacement compensation function, but also ensures the stability of the structure.

[0025] A support ring 13 is fixedly connected to the inner wall of the wedge-shaped guide cylinder 11. The extension of the wedge-shaped guide cylinder 11 is fixedly connected to the outer wall of the screening box 2 through a flange, so that the entire axial bearing system is firmly fixed on the screening box 2, forming a complete force transmission path from the shaft roller to the frame 1.

[0026] like Figure 3 and Figure 6 As shown, a moving dustproof disc 14 is fixedly connected to the rotating end of the plane bearing 6. Several moving dustproof rings 1401 with equal spacing are fixedly connected to the inner wall of the moving dustproof disc 14. A stationary dustproof disc 15 is fixedly connected to the end of the thrust ring 7 near the screening box 2. Several stationary dustproof rings 1501 with equal spacing are fixedly connected to the inner wall of the stationary dustproof disc 15.

[0027] The dynamic dustproof ring 1401 and the static dustproof ring 1501 are arranged alternately along the axial direction and maintain a non-contact gap to form a labyrinth structure. The advantage of this labyrinth design is that it can adapt to axial movement and maintain a good sealing effect when the shaft roller is displaced. After dust enters the labyrinth channel, due to the tortuous and complex path, the flow rate is reduced, and most of the dust will be deposited in the channel and cannot reach the bearing area. Compared with traditional contact seals, labyrinth seals have no wear problems, longer service life, and lower maintenance costs.

[0028] like Figure 3 and Figure 6 As shown, a support plate 16 is fixedly connected to the outer wall of the screening box 2. Several bearing seats 17 with equal spacing are fixedly connected to the top of the support plate 16. The bearing seats 17 are rotatably connected to the transmission shaft head 4 through bearings. These radial bearings are specifically designed to bear radial loads. After the axial load is shared by the planar bearings, the radial bearings can work within their design working range, avoiding overload and uneven wear, and extending their service life.

[0029] like Figure 2 As shown, the double-row chain transmission mechanism includes two axially spaced first transmission sprockets 18 and second transmission sprockets 19 fixedly connected to the outer end of the transmission shaft head 4. The first transmission sprockets 18 of adjacent shaft rollers are rotatably connected by a first transmission chain to form a first transmission chain system. The second transmission sprockets 19 of adjacent shaft rollers are rotatably connected by a second transmission chain to form a second transmission chain system. The first transmission chain and the second transmission chain are staggered in the axial direction. The staggered arrangement avoids spatial interference and makes the transmission system layout more compact and reasonable.

[0030] A drive motor 20 is fixedly connected to the top of the support plate 16. The output shaft of the drive motor 20 is rotatably connected to the first transmission sprocket 18 at the end through a transmission chain to realize the drive of the whole machine. The drive system adopts frequency conversion speed regulation, which can adjust the screening speed according to the material properties and processing requirements to improve adaptability.

[0031] The outer wall of the screening box 2 is fixedly connected with a buckle 21. The outer end of the buckle 21 is engaged with a dustproof shell 22. The bottom end of the dustproof shell 22 is engaged with the support plate 16 to form a complete protective cover. The design of the dustproof shell not only protects the transmission system from the harsh environment, but also facilitates maintenance personnel to carry out inspection and maintenance.

[0032] like Figures 1-3 and Figure 6 As shown, a feed hopper 23 is fixedly connected to the feed end of the screening box 2, and a chute 24 is fixedly connected to the inner wall of the feed hopper 23. The chute 24 guides the material to be evenly distributed to the working area of ​​each screening roller. A discharge hopper 25 is fixedly connected to the discharge end of the screening box 2, and a fine ore collection box 26 is fixedly connected to the bottom end of the screening box 2, thus realizing the effective separation and collection of materials.

[0033] The raw ore enters the screening box 2 through the feed hopper 23 and is screened under the action of gravity and screening rollers 3. The axial thrust generated during the screening process is specially borne by the flat bearing 6, and the axial movement is compensated in real time by the disc spring group 9 to ensure that the bearing system operates under stable conditions. The wedge block 10 cooperates with the wedge guide groove 12 to realize the effective transmission and decomposition of load. The labyrinth seal formed by the dynamic and static dustproof rings effectively prevents dust from entering. The double-row chain transmission mechanism ensures the reliability of transmission. The entire system realizes efficient, stable and reliable screening operation.

[0034] Compared with traditional screening equipment, this technical solution improves the service life and operational reliability of the equipment through load division, elastic compensation, effective force transmission and reliable sealing, providing strong support for the technological progress of the mineral processing industry.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mineral processing pre-screening device, comprising a frame (1) and a screening box (2), characterized in that: The inner wall of the screening box (2) is rotatably connected with several sets of inclined screening rollers (3), and both ends of the screening rollers (3) are fixedly connected with a transmission shaft head (4) and a support shaft head (5). The shoulders of the drive shaft head (4) and the support shaft head (5) are respectively fitted with plane bearings (6), and the rotating ends of the plane bearings (6) abut against the drive shaft head (4) and the support shaft head (5) respectively. The stationary end of the plane bearings (6) is fitted with a thrust ring (7), and the outer end of the thrust ring (7) is fixedly connected with a guide tube (8). The outer wall of the guide tube (8) is fitted with several axially connected disc springs (9), and the disc springs (9) are stacked sequentially along the axial direction of the guide tube (8). The outer wall of the guide tube (8) is provided with a wedge-shaped component, which is used for the decomposition and transmission of axial force.

2. The mineral processing pre-screening device according to claim 1, characterized in that: The wedge assembly includes wedge blocks (10) evenly distributed circumferentially along the outer wall of the guide tube (8), and the end of the wedge block (10) close to the disc spring (9) abuts against the disc spring (9). The outer wall of the guide tube (8) is fitted with a wedge guide cylinder (11). The interior of the wedge guide cylinder (11) is provided with a plurality of wedge guide grooves (12) that match the wedge blocks (10). The inner wall of the wedge guide cylinder (11) is fixedly connected with a support ring (13). The extension of the wedge guide cylinder (11) is fixedly connected to the outer wall of the screening box (2) through a flange.

3. The mineral processing pre-screening device according to claim 1, characterized in that: The rotating end of the plane bearing (6) is fixedly connected to a dynamic dustproof disc (14), and the inner wall of the dynamic dustproof disc (14) is fixedly connected to a number of equally spaced dynamic dustproof rings (1401). The end of the thrust ring (7) near the screening box (2) is fixedly connected to a static dustproof disc (15), and the inner wall of the static dustproof disc (15) is fixedly connected to a number of equally spaced static dustproof rings (1501). The dynamic dustproof rings (1401) and the static dustproof rings (1501) are arranged alternately along the axial direction and maintain a non-contact gap.

4. The mineral processing pre-screening device according to claim 1, characterized in that: The outer wall of the screening box (2) is fixedly connected to a support plate (16), and the top of the support plate (16) is fixedly connected to several bearing seats (17) distributed at equal intervals. The bearing seats (17) are rotatably connected to the transmission shaft head (4) through bearings.

5. A mineral processing pre-screening device according to claim 1, characterized in that: It also includes a double-row chain transmission mechanism, which includes two axially spaced first transmission sprockets (18) and second transmission sprockets (19) fixedly connected to the outer end of the transmission shaft head (4). The first transmission sprockets (18) of adjacent shaft rollers are rotatably connected by a first transmission chain to form a first transmission chain system. The second transmission sprockets (19) of adjacent shaft rollers are rotatably connected by a second transmission chain to form a second transmission chain system. The first transmission chain and the second transmission chain are axially staggered.

6. A mineral processing pre-screening device according to claim 4, characterized in that: The top of the support plate (16) is fixedly connected to a drive motor (20), and the output shaft of the drive motor (20) is rotatably connected to the first transmission sprocket (18) at the end through a transmission chain.

7. A mineral processing pre-screening device according to claim 1, characterized in that: The outer wall of the screening box (2) is fixedly connected with a buckle (21), and the outer end of the buckle (21) is engaged with a dustproof shell (22). The bottom end of the dustproof shell (22) is engaged with the support plate (16).

8. A mineral processing pre-screening device according to claim 1, characterized in that: The feeding end of the screening box (2) is fixedly connected to a feeding hopper (23), the inner wall of the feeding hopper (23) is fixedly connected to a chute (24), the discharging end of the screening box (2) is fixedly connected to a discharging hopper (25), and the bottom end of the screening box (2) is fixedly connected to a fine ore collection box (26).

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