Screening device for ore

Abstract

The invention relates to the field of ore mesh screen equipment, in particular to an ore screening device which comprises a horizontally-arranged rack and further comprises a vibrating screen body, and three layers of inclined stainless steel screen meshes which are arranged in a step shape from top to bottom are arranged in an inner screening cavity of the vibrating screen body; the cylindrical pushing rods are arranged below the screens in parallel in the ore conveying direction, and the axes of the cylindrical pushing rods are parallel to the planes of the corresponding screens; the driving mechanism is used for driving the cylindrical pushing rod to rotate along the axis of the cylindrical pushing rod; the front end of a piston rod of the double-stroke linear driver is movably connected with the end part of the cylindrical pushing rod; the cylindrical surface of the cylindrical push rod is provided with a semi-cylindrical protrusion, and the vertical movement stroke of the semi-cylindrical protrusion covers the projection area of the corresponding screen in the thickness direction. The screening device has the effect of solving the problem of time sequence conflict between the screening process and the cleaning operation process of an existing screening device.

Description

Technical Field

[0001] The invention relates to the field of ore screen equipment, in particular to a screening device for ore. Background Art

[0002] In the ore dressing industry, the screening device is the key equipment for material particle size classification, and its operating efficiency directly affects the overall technical and economic indicators of the ore dressing process chain. The current mainstream screening equipment adopts mechanical structures such as inertial vibrating screens and cylindrical rotary screens to achieve ore particle size separation through multi-layer gradient screens.

[0003] As a pre-processing unit in the mineral processing flow, the stability of the screening process is directly related to the qualified rate of the crushing system feed particle size and the control accuracy of the gravity separation / flotation system feed concentration. Efficient screening technology can not only effectively improve the comprehensive utilization rate of mineral resources, but also significantly extend the service life of equipment by reducing the abnormal wear rate of the screen.

[0004] Referring to the Chinese patent application document with publication number CN113976427A and publication date January 28, 2022, entitled "A dust-removing vibrating ore dressing machine capable of cleaning a screen", the device arranges a matrix cleaning plate array on the back side of the screen, and drives the cleaning plate to perform reciprocating lifting motion in a direction perpendicular to the screen surface by a hydraulic cylinder, and utilizes the geometric matching characteristics of the wedge-shaped structure at the front end of the push plate and the screen hole to realize forced discharge of stuck materials.

[0005] In the above-mentioned related technologies, there is a strict time conflict between the screening process and the cleaning operation, that is, in order to avoid the motion interference between the ore flow and the cleaning plate during the dynamic screening process, the above-mentioned clearing action needs to be performed after the screening equipment is completely shut down. During the screening process, the stuck material continues to bear the normal extrusion force and tangential friction force of the ore flow during the screening vibration cycle, resulting in a nonlinear increase in the contact stress between the stuck material and the screen hole wall, which significantly increases the energy consumption of the subsequent clearing operation. In addition, during the screening process, as the amount of stuck material increases, the above-mentioned device will cause a significant decrease in the screening efficiency and screening quality of the ore. Summary of the invention

[0006] In view of this, the present invention provides a screening device for ore, which is mainly used to solve the problem of timing conflict between the screening process and the cleaning process of the existing screening device.

[0007] The present invention provides an ore screening device which adopts the following technical solution.

[0008] A screening device for ore, comprising a horizontally arranged frame, the screening device also includes: a vibrating screen body, whose screening inner cavity is provided with three layers of inclined stainless steel screens arranged in a stepped manner from top to bottom, and the aperture of the screen holes of each layer of the screen decreases layer by layer; a cylindrical push rod, which is arranged parallel to the ore conveying direction under each layer of the screen, and its axis is kept parallel to the corresponding screen plane; a driving mechanism, which is used to drive the cylindrical push rod to rotate along its own axis; and a double-stroke linear drive, whose piston rod front end is movably connected to the end of the cylindrical push rod; wherein, the cylindrical surface of the cylindrical push rod is provided with a semi-cylindrical protrusion, and the vertical movement stroke of the semi-cylindrical protrusion covers the projection area in the thickness direction of the corresponding screen.

[0009] By adopting the above technical scheme, the present invention uses the compound motion design (rotation + linear movement) of the cylindrical push rod and the geometric constraint of the semi-cylindrical protrusion. During the continuous vibration screening process of the screen, the periodic lifting action of the protrusion is used to directly act on the embedding direction of the stuck material, and the mechanical bite between the stuck material and the wall of the screen hole is released in real time, which solves the efficiency loss problem caused by the need to stop the machine for cleaning operations in traditional technologies. At the same time, the matching design of the axial extension length of the semi-cylindrical protrusion and the screen hole distribution area, combined with the decreasing aperture layout of the layered screen, allows the upper large-aperture screen to prioritize cleaning of large-particle stuck materials, and the lower small-aperture screen accurately maintains the screening accuracy. On the premise of avoiding damage to the rigidity of the screen, the screening flux and cleaning efficiency are synergistically improved, thereby significantly reducing the unit energy consumption and extending the continuous operation cycle of the equipment.

[0010] Optionally, the radius R of the semi-cylindrical protrusion and the vertical distance H from the central axis of the cylindrical push rod to the corresponding screen plane satisfy R≥H; when R=H, the outer edge of the semi-cylindrical protrusion forms a tangential contact with the lower surface of the screen during rotation; when R>H, the outer edge of the semi-cylindrical protrusion produces periodic gap contact with the lower surface of the screen during rotation, and the depth of the gap is RH.

[0011] By adopting the above technical solution, when R=H, the outer edge of the semi-cylindrical protrusion forms tangential contact with the lower surface of the screen during rotation. This tangential contact makes the lifting force applied by the protrusion to the stuck material perpendicular to the plane of the screen, and can lift the stuck material in the screen with minimal force loss, reducing the additional pressure on the screen, effectively avoiding the deformation or damage of the screen due to excessive pressure, and realizing low-stress lifting of the stuck material.

[0012] When R>H, the outer edge of the semi-cylindrical protrusion produces periodic gap contact with the lower surface of the screen during rotation, and the gap depth is R-H. In this case, as the cylindrical push rod rotates, the semi-cylindrical protrusion periodically squeezes the screen, causing the screen to deform elastically. The disturbance effect caused by this elastic deformation breaks the original accumulation state of the material on the screen surface. On the one hand, it can effectively eliminate the risk of secondary wedging between the stuck material and the screen, making the stuck material easier to clean; on the other hand, the elastic vibration of the screen has a shaking effect on the material on the screen, prompting the material to be redistributed on the screen surface, making the material distribution on the screen more even, thereby improving the screening effect.

[0013] Optionally, the driving mechanism includes: a linear guide fixed to the frame along the axis of movement of the piston rod of the double-stroke linear drive; a sliding seat forming a sliding pair with the linear guide; a fixed rack arranged parallel to the linear guide and fixed to the frame; a driving gear forming a circumferential positioning with the end of the cylindrical push rod through a flange-type coaxial connection structure and meshing with the fixed rack; wherein an axial rotation pair is provided between the sliding seat and the hub of the driving gear, and the rotation pair includes an inner ring of a bearing that is interference fit with the hub of the driving gear and an outer ring of a bearing of an angular contact ball bearing that is clearance fit with the sliding seat.

[0014] Optionally, the number of axially arranged semi-cylindrical protrusions corresponds to the number of axially distributed sieve holes of the sieve, and the axial extension length of each semi-cylindrical protrusion covers a continuous distribution area in the direction of the maximum aperture of the sieve holes in the corresponding sieve layer.

[0015] By adopting the above technical solution, by making the axial arrangement number of semi-cylindrical protrusions correspond to the axial distribution number of screen holes, and making the axial extension length of each semi-cylindrical protrusion cover the continuous distribution area in the direction of the maximum aperture of the screen holes in the corresponding screen layer, more effective lifting of the stuck material on the screen is achieved.

[0016] Optionally, the ratio of the axial extension length L of the semi-cylindrical protrusion to the maximum aperture D of the sieve holes in the sieve satisfies 1.1≤L / D≤1.2, and the axial extension direction of the semi-cylindrical protrusion is parallel to the axial direction of the corresponding sieve layer.

[0017] Optionally, each layer of the screen is composed of an upper screen and a lower screen stacked on top of each other, wherein: the lower screen is fixedly connected to the frame; the upper screen is slidably connected to the lower screen via a slide rail pair, and the arrangement period of the screen hole arrays of the two is the same; a threaded adjustment assembly is provided on the edge of the upper screen to drive the lower screen to produce a controllable displacement along the guide direction of the slide rail pair.

[0018] By adopting the above technical solution, the lower screen is fixed to the frame, and the upper screen is connected to the lower screen by sliding through the slide rail pair, ensuring the stability and accuracy of the relative movement between the two; at the same time, the arrangement period of the screen hole arrays of the two is the same, and the threaded adjustment component set on the edge of the upper screen can drive the upper screen to produce a controllable displacement along the guide direction of the slide rail pair. This displacement causes a misalignment angle between the upper and lower screens, and the change in the misalignment angle directly causes a change in the diameter of the material discharge channel formed between the screen holes, thereby achieving effective adjustment of the size of the material allowed to pass, so that the screening device can flexibly adapt to ore screening operations with different particle size requirements.

[0019] Optionally, the threaded adjustment assembly includes: a fixed base plate, fixed to the top of the frame and provided with a threaded hole therethrough; an adjusting screw, threadedly matched with the threaded hole, one end of which is provided with a limit nut, and the other end of which is provided with a limit baffle; a connecting plate, uprightly arranged on the top edge of the upper screen, the bottom of which is rigidly connected to the upper screen and can move under the drive of the limit baffle; wherein the axial direction of the adjusting screw is parallel to the guide direction of the slide rail pair.

[0020] By adopting the above technical solution, when the adjusting screw is turned, the screw moves along the axial direction in the threaded hole. The limit nut at one end of the adjusting screw prevents the adjusting screw from being excessively screwed out, thereby ensuring the safety and stability of the adjustment. The limit baffle at the other end of the adjusting screw is connected to the connecting plate, which is rigidly connected to the upper screen. Since the axial direction of the adjusting screw is parallel to the guide direction of the slide rail pair, the movement of the adjusting screw can drive the limit baffle to move synchronously, thereby driving the connecting plate and the upper screen rigidly connected thereto to be displaced along the guide direction of the slide rail pair, so that the upper screen moves relative to the fixed lower screen, thereby realizing the adjustment of the misalignment angle between the upper screen and the lower screen. This structural design enables the position change of the upper screen to be accurately controlled by simply turning the adjusting screw, thereby accurately adjusting the misalignment angle between the upper and lower screens, providing a flexible and precise adjustment method for screening materials of different particle sizes.

[0021] Optionally, the threaded adjustment assembly also includes: a guide rod, one end of which is rigidly connected to the limit baffle, and the other end passes through the connecting plate and is fixedly connected to the limit block; a reset spring, which is sleeved on the guide rod, and its two ends are respectively abutted against the fixed base plate and the connecting plate; a reset push plate, which has a T-shaped cross-section, its vertical portion is rigidly connected to the connecting plate, and the horizontal portion extends to the radial side of the cylindrical push rod; and an arc-shaped material baffle plate, which is fixed to the surface of the cylindrical push rod and arranged on the same side as the semi-cylindrical protrusion; wherein the outer edge contour of the arc-shaped material baffle plate forms a rolling contact with the lower surface of the horizontal portion of the reset push plate, and when the semi-cylindrical protrusion rotates to below the corresponding screen, the arc-shaped material baffle plate pushes the reset push plate to move toward the fixed base plate, so that the sieve hole arrays of the upper screen and the lower screen are completely aligned.

[0022] By adopting the above technical solution, when the semi-cylindrical protrusion rotates to clean the stuck material, the arc-shaped material blocking plate on the same side rotates accordingly, and it rolls with the reset push plate to push the reset push plate and the upper screen to move, so that the upper and lower screen mesh arrays are completely aligned, and the diameter of the material discharge channel is expanded to the maximum. This not only provides a favorable space for the semi-cylindrical protrusion to clean the stuck material, but also allows the semi-cylindrical protrusion to block large particles of material under the channel, thereby improving the screening efficiency and quality.

[0023] Optionally, the two-stroke linear drive is a two-stroke hydraulic cylinder, a two-stroke electric actuator or a two-stroke pneumatic actuator, and its cylinder body is fixed to the frame through a flange mounting seat.

[0024] Optionally, both ends of the arc-shaped material baffle plate are provided with smooth transition surfaces, the curvature radius of the transition surfaces is greater than the curvature radius of the surface of the cylindrical push rod, and the arc-shaped material baffle plate is detachably connected to the circumferential surface of the cylindrical push rod through a mortise and tenon joint structure.

[0025] By adopting the above technical solution, the radius of curvature of the transition surface is greater than the radius of curvature of the cylindrical push rod surface. This design effectively avoids scratches or wear on the reset push plate or other components due to sharp corners during the rotation of the arc baffle plate with the cylindrical push rod, reduces mechanical losses during equipment operation, and extends the service life of related components. At the same time, the arc baffle plate and the circumferential surface of the cylindrical push rod are detachably connected through the mortise and tenon joint structure. During daily maintenance and repair of the equipment or when the arc baffle plate needs to be replaced, the arc baffle plate can be easily installed and removed without complicated disassembly tools and operations. This not only improves the efficiency of equipment maintenance, reduces downtime for maintenance, but also reduces maintenance costs, making the long-term operation and management of the equipment more efficient and economical.

[0026] In summary, the present invention includes the following beneficial technical effects: The present invention utilizes the compound motion design (rotation + linear movement) of the cylindrical push rod and the geometric constraints of the semi-cylindrical protrusions. During the continuous vibration screening process of the screen, the periodic lifting action of the semi-cylindrical protrusions is used to directly act on the embedding direction of the stuck material, and the mechanical bite between the stuck material and the wall of the screen hole is released in real time, thereby solving the problem of efficiency loss caused by the need to shut down the machine for cleaning operations in traditional technologies. At the same time, the matching design of the axial extension length of the semi-cylindrical protrusion and the screen hole distribution area, combined with the decreasing aperture layout of the layered screens, allows the upper large-aperture screen to prioritize cleaning of large-particle stuck materials, while the lower small-aperture screen accurately maintains the screening accuracy. Under the premise of avoiding damage to the rigidity of the screen, the screening flux and the cleaning efficiency are synergistically improved, thereby significantly reducing the unit energy consumption and extending the continuous operation cycle of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of an ore screening device according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram of the screen, the driving mechanism and the threaded adjustment assembly; Figure 3 It is a structural schematic diagram reflecting the driving mechanism; Figure 4 yes Figure 3 A partial enlarged view of the middle area A; Figure 5 It is a schematic diagram of the structure of the thread adjustment assembly; Figure 6 It is a schematic diagram of the structure in which the cylindrical push rod and the reset push plate are in contact; Figure 7 It is a schematic diagram of the structure of a cylindrical push rod.

[0028] Description of reference numerals: 1. Screen; 11. Screen hole; 12. Upper screen; 13. Lower screen; 2. Cylindrical push rod; 21. Semi-cylindrical protrusion; 3. Driving mechanism; 31. Linear guide; 32. Sliding seat; 33. Fixed rack; 34. Driving gear; 4. Double stroke linear drive; 5. Thread adjustment assembly; 51. Fixed base plate; 52. Adjusting screw; 521. Limiting nut; 522. Limiting baffle; 53. Connecting plate; 54. Guide rod; 55. Reset spring; 56. Reset push plate; 57. Arc baffle plate; 100. frame; 101. vibrating screen body. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 -Attached Figure 7 , the technical solution of the embodiment of the present invention is clearly and completely described.

[0030] The embodiment of the present invention discloses a screening device for ore. Figure 1 and Figure 2 A screening device for ore includes a horizontally arranged frame 100, a vibrating screen body 101, a cylindrical push rod 2, a driving mechanism 3 and a double-stroke linear drive 4. The screening inner cavity of the vibrating screen body 101 is provided with three layers of inclined stainless steel screens arranged in a stepped manner from top to bottom, and the apertures of the screen holes 11 of each layer of the screen 1 decrease layer by layer.

[0031] Reference Figure 3 and Figure 4Each layer of screen 1 is composed of an upper screen 12 and a lower screen 13 stacked on each other, wherein the lower screen 13 is fixedly connected to the frame 100, and the upper screen 12 is slidably connected to the lower screen 13 through a slide rail pair, and the arrangement period of the screen hole 11 arrays of the two is the same, and a threaded adjustment component 5 is provided on the edge of the upper screen 12, which is used to drive the upper screen 12 to produce a controllable displacement along the guide direction of the slide rail pair.

[0032] The cylindrical push rod 2 is arranged parallel to the ore conveying direction under each layer of the screen 1, and its axis is kept parallel to the plane of the corresponding screen 1. The driving mechanism 3 is used to drive the cylindrical push rod to rotate along its own axis. The front end of the piston rod of the double-stroke linear actuator 4 forms a movable connection with the end of the cylindrical push rod 2, wherein the cylindrical surface of the cylindrical push rod 2 is provided with a semi-cylindrical protrusion 21, and the vertical movement stroke of the semi-cylindrical protrusion 21 covers the projection area of ​​the thickness direction of the corresponding screen 1. As an embodiment, the double-stroke linear actuator 4 is a double-stroke hydraulic cylinder, a double-stroke electric actuator or a double-stroke pneumatic actuator, and its cylinder body is fixed to the frame 100 through a flange mounting seat.

[0033] By setting a double-stroke linear drive 4 to drive the cylindrical push rod 2, and setting a semi-cylindrical protrusion 21 on the cylindrical surface of the cylindrical push rod 2, the screen 1 can be cleared without interrupting the screening operation during the normal operation of the screening device. The semi-cylindrical protrusion 21 moves linearly in the vertical direction as the cylindrical push rod 2 rotates, and its vertical movement stroke covers the projection area in the thickness direction of the corresponding screen 1, so that it can directly act on the gravel stuck in the screen 1, avoiding the problem of nonlinear growth of the contact stress between the stuck material and the wall of the screen hole 11 due to the continuous normal extrusion pressure and tangential friction force of the ore flow during the screening vibration cycle due to waiting for the screening equipment to stop and clear the blockage, thereby greatly reducing the energy consumption of subsequent clearing operations.

[0034] Driven by the double-stroke linear drive 4, the cylindrical push rod 2 can not only push out the gravel stuck in the screen 1 through the semi-cylindrical protrusion 21, but also move back and forth. During the screening process, this reciprocating movement can timely clean up all the gravel stuck on the screen 1, ensuring the smooth flow of the screen 1, so that the ore can pass through the screen 1 smoothly for graded screening. Compared with the traditional device, the screening efficiency and quality are significantly reduced as the amount of stuck materials increases, the present device can continuously maintain an efficient and stable screening state, effectively improving the screening efficiency and screening quality of the ore.

[0035] The vibrating screen body 101 is provided with three layers of inclined stainless steel screens 1 arranged in a stepped manner from top to bottom, and the apertures of the screen holes 11 of each layer of the screen 1 decrease layer by layer. This structural design cooperates with the cylindrical push rod 2, the drive mechanism 3 and the double-stroke linear drive 4. The drive mechanism 3 drives the cylindrical push rod 2 to rotate along its own axis, providing a power basis for the work of the semi-cylindrical protrusion 21, and the double-stroke linear drive 4 accurately controls the movement of the cylindrical push rod 2, so that the semi-cylindrical protrusion 21 can act on the screen 1 at the right time and in the right way, so as to achieve effective cleaning of the screen 1 and ensure the stable and efficient operation of the entire screening device.

[0036] The radius R of the semi-cylindrical protrusion 21 and the vertical distance H from the central axis of the cylindrical push rod 2 to the corresponding plane of the screen 1 satisfy R≥H. When R=H, the outer edge of the semi-cylindrical protrusion 21 forms a tangential contact with the lower surface of the screen 1 during rotation. When R>H, the outer edge of the semi-cylindrical protrusion 21 produces periodic gap contact with the lower surface of the screen 1 during rotation, and the depth of the gap is RH.

[0037] By adopting the above technical solution, when R=H, the outer edge of the semi-cylindrical protrusion 21 forms tangential contact with the lower surface of the screen 1 during the rotation process. This tangential contact makes the lifting force applied by the protrusion to the stuck material perpendicular to the plane of the screen 1, and can lift the stuck material in the screen 1 with minimal force loss, reducing the additional pressure on the screen 1, effectively avoiding the deformation or damage of the screen 1 due to excessive pressure, and realizing low-stress lifting of the stuck material.

[0038] When R>H, the outer edge of the semi-cylindrical protrusion 21 produces periodic gap contact with the lower surface of the screen 1 during rotation, and the gap depth is R-H. In this case, as the cylindrical push rod 2 rotates, the semi-cylindrical protrusion 21 periodically squeezes the screen 1, causing the screen 1 to undergo elastic deformation. The disturbance effect produced by this elastic deformation breaks the original accumulation state of the material on the screen surface. On the one hand, it can effectively eliminate the risk of secondary wedging between the stuck material and the screen 1, making it easier to clean the stuck material; on the other hand, the elastic vibration of the screen 1 has a shaking effect on the material on the screen 1, prompting the material to be redistributed on the screen surface, making the material distribution on the screen 1 more even, thereby improving the screening effect.

[0039] The driving mechanism 3 includes a linear guide 31, a sliding seat 32, a fixed rack 33 and a driving gear 34. The linear guide 31 is fixed to the frame 100 along the axis of motion of the piston rod of the double-stroke linear actuator 4. The sliding seat 32 and the linear guide 31 form a sliding pair, and the fixed rack 33 is arranged parallel to the linear guide 31 and fixed to the frame 100. The driving gear 34 forms a circumferential positioning with the end of the cylindrical push rod 2 through a flange-type coaxial connection structure and meshes with the fixed rack 33, wherein an axial rotation pair is provided between the sliding seat 32 and the hub of the driving gear 34, and the rotation pair includes an inner ring of a bearing that is interference-fitted with the hub of the driving gear 34 and an outer ring of a bearing of an angular contact ball bearing that is clearance-fitted with the sliding seat 32.

[0040] The linear guide 31 is fixed to the frame 100 along the axial direction of the piston rod of the double-stroke linear actuator 4, providing precise guidance for the sliding seat 32 and ensuring the linearity of the movement. The sliding seat 32 and the linear guide 31 form a sliding pair, which makes the sliding smooth. The fixed rack 33 is arranged parallel to the linear guide 31 and fixed on the frame 100, providing a stable meshing basis for the driving gear 34. The driving gear 34 is circumferentially positioned with the end of the cylindrical push rod 2 through a flange coaxial connection structure to ensure that the two rotate synchronously. When the piston rod of the double-stroke linear actuator 4 drives the cylindrical push rod 2 to move linearly, based on the axial rotation pair set between the sliding seat 32 and the hub of the driving gear 34 (composed of the inner ring of the bearing with interference fit on the hub of the driving gear 34 and the outer ring of the angular contact ball bearing with clearance fit on the sliding seat 32), the driving gear 34 rotates due to the meshing relationship and the action of the rotation pair while moving linearly along the rack, thereby driving the cylindrical push rod 2 to rotate along its own axis, realizing the effective coupling of linear motion and rotational motion.

[0041] The number of axially arranged semi-cylindrical protrusions 21 corresponds to the number of axially distributed sieve holes 11 of the screen 1, and the axial extension length of each semi-cylindrical protrusion 21 covers the continuous distribution area in the direction of the maximum aperture of the sieve holes 11 in the corresponding screen layer. By strictly corresponding the number of axially arranged semi-cylindrical protrusions 21 to the number of axially distributed sieve holes 11, and limiting the axial extension length of the protrusion to cover the continuous distribution area in the direction of the maximum aperture of the sieve holes 11, the movement trajectory of each protrusion forms a spatial match with the distribution of the sieve holes 11. During the rotation of the cylindrical push rod 2, the outer edge of the protrusion sequentially sweeps the continuous material-stuck embedding area in the axial direction of the sieve holes 11, thereby realizing the full-domain synchronous lifting of the stuck material.

[0042] The ratio of the axial extension length L of the semi-cylindrical protrusion 21 to the maximum aperture D of the mesh hole 11 in the mesh 1 satisfies 1.1≤L / D≤1.2, and the axial extension direction of the semi-cylindrical protrusion 21 is parallel to the axial direction of the corresponding mesh layer 1. By limiting the ratio range of the axial extension length L of the semi-cylindrical protrusion 21 to the maximum aperture D of the mesh hole 11 to 1.1≤L / D≤1.2, and ensuring that the protrusion extension direction is parallel to the axis of the mesh 1, a geometric coverage redundancy of the axial distribution area of ​​the mesh hole 11 is formed, so that the outer edge of the protrusion always covers the critical material-stuck embedding area (such as the corners of the end of the mesh hole 11) in the length direction of the mesh hole 11 during the rotation process, and the directional stripping of the stuck material is achieved through the consistency of the lifting force component with the vector of the axial direction of the mesh hole 11, while avoiding the secondary material stuck problem caused by insufficient local lifting.

[0043] Reference Figure 5 , Figure 6 and Figure 7 The threaded adjustment assembly 5 includes a fixed base plate 51, an adjustment screw 52 and a connecting plate 53. The fixed base plate 51 is fixedly mounted on the top of the frame 100 and is provided with a threaded hole therethrough. The adjustment screw 52 is threadedly matched with the threaded hole, one end of which is provided with a limit nut 521, and the other end of which is provided with a limit baffle 522. The connecting plate 53 is vertically arranged on the top edge of the upper screen 12, and its bottom is rigidly connected to the upper screen 12, and can move under the drive of the limit baffle 522. Among them, the axial direction of the adjustment screw 52 is parallel to the guide direction of the slide rail pair.

[0044] The thread adjustment assembly 5 also includes a guide rod 54, a reset spring 55, a reset push plate 56 and an arc-shaped material stop plate 57. One end of the guide rod 54 is rigidly connected to the limit stop plate 522, and the other end passes through the connecting plate 53 and is fixedly connected to the limit block. The reset spring 55 is sleeved on the guide rod 54, and its two ends are respectively abutted against the fixed base plate 51 and the connecting plate 53. The reset push plate 56 has a T-shaped cross section, and its vertical part is rigidly connected to the connecting plate 53, and the horizontal part extends to the radial side of the cylindrical push rod 2. The arc-shaped material stop plate 57 is fixedly arranged on the surface of the cylindrical push rod 2 and arranged on the same side as the semi-cylindrical protrusion 21. The outer edge contour of the arc-shaped baffle plate 57 forms rolling contact with the lower surface of the horizontal part of the reset push plate 56, and when the semi-cylindrical protrusion 21 rotates to the bottom of the corresponding screen 1, the arc-shaped baffle plate 57 pushes the reset push plate 56 to move toward the fixed base plate 51, so that the array of screen holes 11 of the upper screen 12 and the lower screen 13 are completely aligned. Among them, the two ends of the arc-shaped baffle plate 57 are provided with smooth transition surfaces, and the curvature radius of the transition surface is greater than the curvature radius of the surface of the cylindrical push rod 2. The arc-shaped baffle plate 57 is detachably connected to the circumferential surface of the cylindrical push rod 2 through a mortise and tenon joint structure.

[0045] One end of the guide rod 54 is rigidly connected to the limit baffle 522, and the other end passes through the connecting plate 53 and is fixed to the limit block, providing a stable guiding effect for the movement of the connecting plate 53 to ensure the accuracy of its moving direction. The reset spring 55 sleeved on the guide rod 54 has two ends respectively abutting against the fixed base plate 51 and the connecting plate 53, which plays a role of reset and buffering during the operation of the device. Since the outer edge contour of the arc-shaped baffle plate 57 forms a rolling contact with the lower surface of the horizontal part of the reset push plate 56, as the arc-shaped baffle plate 57 rotates, it will push the reset push plate 56 to move in the direction close to the fixed base plate 51. The movement of the reset push plate 56 drives the connecting plate 53 and the upper screen 12 connected thereto to move, so that the array of the sieve holes 11 of the upper screen 12 and the lower screen 13 is completely aligned, and then the diameter of the material discharge channel formed between the sieve holes 11 of the upper screen 12 and the lower screen 13 is expanded to the maximum. On the one hand, the larger diameter of the discharge channel and the semi-cylindrical protrusion 21 create more favorable spatial conditions for the smooth ejection of the stuck material in the screen hole 11, which is beneficial to the cleaning of the stuck material; on the other hand, the semi-cylindrical protrusion 21 is just below the discharge channel, which can effectively block the material with larger particle size from falling from the discharge channel, avoiding the interference of large particle material with the subsequent screening process, and improving the screening efficiency and quality of the entire screening device.

[0046] The implementation principle of a screening device for ore according to an embodiment of the present invention is as follows: when the screening device for ore is in operation, the piston rod of the double-stroke linear driver 4 drives the cylindrical push rod 2 to move linearly, the linear guide 31 accurately guides the sliding seat 32, and the axial rotation pair between the sliding seat 32 and the hub of the driving gear 34 causes the driving gear 34 to move linearly along the fixed rack 33 and drives the cylindrical push rod 2 to rotate, thereby providing energy for the semi-cylindrical protrusion 21 to work. The axial arrangement of the semi-cylindrical protrusion 21 corresponds to the distribution of the sieve holes 11, and realizes synchronous lifting and directional stripping of stuck materials. In the threaded adjustment assembly 5, the adjusting screw 52 drives the upper screen 12 to move to adjust the misalignment angle. When the semi-cylindrical protrusion 21 rotates, the arc-shaped material blocking plate 57 pushes the reset push plate 56 to align the sieve holes 11 and maximize the material discharge channel, which is conducive to clearing blockages.

[0047] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “vertical” and “horizontal” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

Claims

1. A screening device for ore, comprising a horizontally arranged frame, characterized in that: The screening device also includes: The vibrating screen body has a screening inner cavity with three layers of inclined stainless steel screens arranged in a stepped manner from top to bottom, and the aperture of each layer of screen decreases layer by layer; The cylindrical push rod is arranged parallel to the ore conveying direction and below each layer of screens, and its axis is kept parallel to the corresponding screen plane; A driving mechanism, used for driving the cylindrical push rod to rotate along its own axis; and A double-stroke linear actuator, the front end of the piston rod of which is movably connected to the end of the cylindrical push rod; Wherein, a semi-cylindrical protrusion is provided on the cylindrical surface of the cylindrical push rod, and the vertical movement stroke of the semi-cylindrical protrusion covers the projection area corresponding to the thickness direction of the screen.

2. The screening device according to claim 1, characterized in that: The radius R of the semi-cylindrical protrusion and the vertical distance H from the central axis of the cylindrical push rod to the corresponding screen plane satisfy R≥H; When R=H, the outer edge of the semi-cylindrical protrusion forms tangential contact with the lower surface of the screen during rotation; When R>H, the outer edge of the semi-cylindrical protrusion generates periodic gap contact with the lower surface of the screen during rotation, and the depth of the gap is RH.

3. The screening device according to claim 1, characterized in that: The driving mechanism comprises: A linear guide rail is fixedly arranged on the frame along the movement axis direction of the piston rod of the double-stroke linear actuator; A sliding seat, forming a sliding pair with the linear guide rail; A fixed rack, arranged parallel to the linear guide rail and fixed to the frame; A driving gear is circumferentially positioned with the end of the cylindrical push rod through a flange-type coaxial connection structure and meshes with the fixed rack; An axial rotation pair is provided between the sliding seat and the hub of the driving gear, and the rotation pair comprises an inner ring of a bearing which is interference-fitted with the hub of the driving gear and an outer ring of an angular contact ball bearing which is clearance-fitted with the sliding seat.

4. The screening device according to claim 1, characterized in that: The number of axially arranged semi-cylindrical protrusions corresponds to the number of axially distributed sieve holes of the sieve, and the axial extension length of each semi-cylindrical protrusion covers a continuous distribution area in the direction of the maximum aperture of the sieve holes in the corresponding sieve layer.

5. The screening device according to claim 4, characterized in that: The ratio of the axial extension length L of the semi-cylindrical protrusion to the maximum aperture D of the sieve holes in the sieve satisfies 1.1≤L / D≤1.2, and the axial extension direction of the semi-cylindrical protrusion is parallel to the axial direction of the corresponding sieve layer.

6. The screening device according to claim 1, characterized in that: Each layer of the screen is composed of an upper screen and a lower screen stacked on top of each other. Composition, of which: The lower screen is fixedly connected to the frame; The upper screen mesh is slidably connected to the lower screen mesh via a slide rail pair, and the arrangement period of the screen hole arrays of the two is the same; A threaded adjustment assembly is provided at the edge of the upper screen, which is used to drive the upper screen to produce a controllable displacement along the guiding direction of the slide rail pair.

7. The screening device according to claim 6, characterized in that: The thread adjustment assembly comprises: A fixed base plate is fixedly mounted on the top of the frame and is provided with a threaded hole therethrough; An adjusting screw rod is threadedly matched with the threaded hole, one end of the adjusting screw rod is provided with a limiting nut, and the other end of the adjusting screw rod is provided with a limiting baffle; A connecting plate, which is vertically arranged on the top edge of the upper screen, has a bottom which is rigidly connected to the upper screen, and can move under the drive of the limit baffle; Wherein, the axial direction of the adjusting screw is parallel to the guiding direction of the slide rail pair.

8. The screening device according to claim 7, characterized in that: The thread adjustment assembly also includes: A guide rod, one end of which is rigidly connected to the limit baffle, and the other end of which penetrates the connecting plate and is fixedly connected to the limit block; The return spring is sleeved on the guide rod, and its two ends are respectively in contact with the fixed base plate and the connecting plate; A reset push plate having a T-shaped cross section, a vertical portion of which is rigidly connected to the connecting plate, and a horizontal portion of which extends to the radial side of the cylindrical push rod; and The arc-shaped material blocking plate is fixedly arranged on the surface of the cylindrical push rod and arranged on the same side as the semi-cylindrical protrusion; Among them, the outer edge contour of the arc-shaped material baffle plate forms a rolling contact with the lower surface of the horizontal part of the reset push plate, and when the semi-cylindrical protrusion rotates to the bottom of the corresponding screen, the arc-shaped material baffle plate pushes the reset push plate to move toward the fixed base plate, so that the sieve hole arrays of the upper screen and the lower screen are completely aligned.

9. The screening device according to claim 1, characterized in that: The double-stroke linear actuator is a double-stroke hydraulic cylinder, a double-stroke electric actuator or a double-stroke pneumatic actuator, and its cylinder body is fixed to the frame through a flange-type mounting seat.

10. The screening device according to claim 8, characterized in that: Both ends of the arc-shaped material baffle plate are provided with smooth transition curved surfaces, the curvature radius of the transition curved surfaces is greater than the curvature radius of the surface of the cylindrical push rod, and the arc-shaped material baffle plate is detachably connected to the circumferential surface of the cylindrical push rod through a mortise and tenon joint structure.

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