A multi-stage vibrating screen

Abstract

The present application provides a multi-stage vibrating screen, which belongs to the technical field of vibrating screens, including a screen box and a vibrator and multiple screens arranged inside it, and the multiple screens are installed inside the screen box in a vertical array; a plurality of brackets corresponding to the screens are arranged inside the screen box, and a plurality of pressure plates corresponding to the screens and located above the brackets are arranged inside the screen box, and a gap for the screens to be inserted is reserved between the brackets and the pressure plates, and a plurality of limit plates are hinged on the front and rear inner walls of the screen box, and the front and rear ends of the screens are bent upward and are arranged in a stirrup shape to be engaged with the bottom edge of the limit plate; a plurality of transition frames are slidably connected to the screen box, and two clamping beams are longitudinally slidably connected to the transition frames, and a plurality of linkage ribs are hinged between the clamping beams and the pressure plates, and a driving member is provided on the screen box; the present application can quickly complete the replacement of the screen, and at the same time can reduce the possibility of the screen loosening during the subsequent vibration screening process.

Description

Technical Field

[0001] The present application relates to the technical field of vibrating screens, and in particular to a multi-stage vibrating screen. Background Art

[0002] A vibrating screen is a highly efficient device that uses vibration to screen materials. It is widely used in industries such as metallurgy, mining, chemicals, building materials, and grain processing. Its core operating principle is to transmit power to the screen body or mesh via a built-in vibrator or exciter, generating continuous, periodic vibrations. These vibrations cause the material to continuously roll, jump, or tumble on the screen surface, separating materials of different particle sizes and densities, thereby achieving screening and grading. Vibrating screens are classified into several common types based on their structure and vibration mode. Linear vibrating screens utilize a linear transmission of vibration, resulting in a simple screen surface and high screening efficiency. They are suitable for screening larger particles or dry materials. Circular vibrating screens utilize an eccentric barrel or block to generate circular motion, resulting in a circular vibration path and easy maintenance. They are commonly used for screening materials in the medium particle size range. Rotary vibrating screens combine the characteristics of rotation and vibration, making them suitable for processing fine-grained or highly viscous materials. They offer the advantages of a compact structure and high screening efficiency.

[0003] Among them, linear vibrating screens have become one of the most commonly used devices in ore screening due to their high screening efficiency, strong adaptability, and easy maintenance. By adding multiple layers of screens to the linear vibrating screen, and setting the aperture of each layer of screen in a decreasing order from top to bottom, the linear vibrating screen can have a multi-stage screening function. In actual use, the material begins to be screened by the upper screen, and the larger particle size material is intercepted by the first layer of screen. The lower screen will screen the fine particles that have passed through the first layer, and so on, separating the target particle size and fine particles step by step. By adjusting the aperture of each layer of screen, different screening requirements can be achieved, allowing the material to be classified at multiple levels within a single device, improving screening efficiency and accuracy.

[0004] Reference is made to a Chinese patent document with publication number CN119634216A, date of publication on March 18, 2025, entitled "A multi-stage vibrating screening machine for ore concentrating," comprising a screening frame, a multi-stage screening mechanism provided on one side of the screening frame for performing multi-stage screening on the ore, a dust reduction assembly provided on one side of the multi-stage screening mechanism for performing dust reduction treatment on the ore being screened, and a transmission assembly provided on one side of the multi-stage screening mechanism for automatically conveying the ore to be screened to the screening frame. By providing the multi-stage screening mechanism, the function of multi-stage screening of the ore is achieved, while also having the effect of facilitating the replacement of the screens; the screening frame is vibrated by a vibration motor and a spring, and is used in conjunction with a first screen, a second screen, and a third screen to perform multi-stage screening on the ore, and since the first screen, the second screen, and the third screen are bolted to the screening frame, the screens can be replaced by the operator according to the size of the ore, thereby effectively carrying out the screening work.

[0005] Referring to the above technical solution, when the screen is installed on the screen box of the vibrating screen by bolting, the disassembly and assembly of the screen requires the removal of multiple sets of bolts before the screen can be disassembled and replaced. In this case, the operating burden on personnel is heavy, and the time cost of disassembly and assembly will also increase, which is likely to affect the overall efficiency of the screening work. In the subsequent vibratory screening process, as the screen box and screen continue to vibrate, the bolts tend to gradually loosen due to the vibration, causing the screen to be unable to maintain its original tension state, thereby affecting the screening of the ore. Summary of the Invention

[0006] In view of this, the present application provides a multi-stage vibrating screen, which is mainly used to solve the problems that the screen replacement operation is relatively cumbersome and the screen is easily loosened due to vibration.

[0007] In order to solve the above technical problems, the present application provides a multi-stage vibrating screen, including a screen box, a vibrator and multiple screens arranged inside it, and the multiple screens are installed inside the screen box in a vertical array; a plurality of brackets corresponding to the screens are arranged inside the screen box, a plurality of pressure plates corresponding to the screens and located above the brackets are arranged inside the screen box, and a gap for the screens to be inserted is reserved between the brackets and the pressure plates, and a plurality of limit plates corresponding to the screens are hingedly connected to the front and rear inner walls of the screen box, and the front and rear ends of the screens are bent upward and are arranged in a stirrup shape to be engaged with the bottom edge of the limit plate; a plurality of transition frames corresponding to the pressure plates are slidably connected to the screen box, and two abutting beams that can abut the limiting plates are longitudinally slidably connected to the transition frames, and a plurality of linkage ribs are hinged between the abutting beams and the pressure plates, and a driving member for driving the transition frame to move laterally is provided on the screen box.

[0008] By adopting the above technical solution, when carrying out the disassembly, assembly and replacement of the screen, the pressure plate and the bracket are used as the limiting components of the screen. The pressure plate and the bracket can press and fix the screen, which can effectively reduce the operating burden of the personnel compared to the bolt fixing method. And the personnel only need to twist the screw to achieve the coordinated adjustment of the linkage ribs and the tightening beam, so that the screen fixed by the pressure plate is subjected to further tightening force, effectively ensuring the precise positioning and tightening of the screen. During the installation process, the limiting plate can be embedded in the bent part of the screen to prevent the screen from longitudinally shifting and ensure the stability of the screen position. Then, the screen is tightened by the cooperation of the linkage ribs and the tightening beam to ensure that the screen is always in a tensioned state, which helps to improve the screening efficiency and the flatness of the screen surface and reduce the problem of uneven screening caused by deformation and relaxation of the screen. During the disassembly process, the operation is simple, and the fixed state of the screen can be quickly released, shortening the maintenance time. This not only improves the efficiency of screen assembly and disassembly and the convenience of operation, but also enhances the overall stability and reliability of the screening equipment, helps to extend the service life of the screen, and ensures the continuity and efficiency of the screening process.

[0009] Optionally, the left end of the pressure plate is hingedly arranged on the left inner wall of the screen box, and the left end of the pressing beam is provided with a circular sliding hole that can be sleeved on the transition frame.

[0010] By adopting the above technical solution and optimizing the connection method between the pressure plate and the screen box, and the clamping beam and the transition frame, when disassembling and assembling the screen, personnel can lift the pressure plate and the right end of the clamping beam together, thereby exposing the space below the pressure plate, providing personnel with a larger operating space, so that personnel can replace the screen located between the pressure plate and the bracket, and further reducing the difficulty of screen disassembly.

[0011] Optionally, the linkage ribs are all arranged to be inclined from left to right toward the direction close to the central axis of the pressure plate, a plurality of diverter plates are arranged on the pressure plate, and the diverter plates and the linkage ribs are arranged at intervals in the transverse direction.

[0012] By adopting the above technical solution, during the ore screening process, the linkage ribs and the diverter plate work together to guide the ore to move longitudinally on the screen, promote the uniform distribution of the ore, prevent local accumulation, and thus improve the screening effect and efficiency.

[0013] Optionally, the driving member includes a screw rod rotatably connected to the left end of the transition frame, and the screw rod is threadedly connected to a screw hole correspondingly opened on the left inner wall of the screen box.

[0014] By adopting the above technical solution, when a person twists the screw rod, the transition frame can be displaced laterally.

[0015] Optionally, a locking member is provided between the bracket and the pressure plate for locking the relative positions of the bracket and the pressure plate or releasing the relative position locking of the bracket and the pressure plate.

[0016] Optionally, the locking member includes a circular lock hole opened on the bracket, and the top opening of the circular lock hole is set to a rectangular opening, and a locking pin is provided at the bottom end of the hinge shaft on the linkage rib close to the pressure plate side. The locking pin is set in a T shape and can be inserted into the rectangular opening at the top of the circular lock hole.

[0017] By adopting the above technical solution, when the screen is placed in the gap between the pressure plate and the bracket, the transverse pin of the locking pin can pass through the rectangular opening and insert into the circular lock hole, thereby achieving initial fixation. During the process of the transition frame moving to the right, the linkage ribs, the clamping beam and the limit plate work together to tightly support and fix the screen. During this process, the locking pin will rotate with the hinge shaft close to the side of the pressure plate and rotate together with the linkage rib, so that the transverse pin of the locking pin and the rectangular opening on the circular lock hole form a circumferential misalignment, thereby limiting the position of the locking pin in the circular lock hole, achieving the purpose of stable closure, so that the bracket and the pressure plate can clamp the screen more tightly and stably, effectively preventing the screen from loosening or displacement during the subsequent ore screening process. On the contrary, when disassembling the screen, the operator twists the screw in the opposite direction to move the transition frame to the left, and the transverse pin of the locking pin on the linkage rib will be realigned with the rectangular opening in the transverse position. Then the operator lifts the pressure plate and the right end of the tight beam at the same time, driving the locking pin to be pulled out of the circular lock hole along the original path. The whole process does not require additional complicated operations, making the disassembly of the screen simple and quick.

[0018] Optionally, a guide plate is hingedly connected to the feed end at the upper left corner of the screen box to guide the logistics of the material being fed to the screen box.

[0019] By adopting the above technical solution, when the external feeding device transports the ore to the feeding end at the upper left corner of the screen box, the guide plate can guide the ore onto the screen, reducing the possibility of the ore impacting the bracket and the pressure plate, thereby protecting the bracket and the pressure plate from damage.

[0020] Optionally, protective plates are provided on the tops of the front and rear inner walls of the screen box. The protective plates are L-shaped and can be abutted against the step surface on the pressing beam to prevent the ore from impacting the limit plate.

[0021] By adopting the above technical solution, when the limit plate is firmly fixed by the clamping beam, the step surface on its upper part is in close contact with the protective plate, effectively preventing the ore from directly impacting the limit plate during the screening process. In addition, this isolation measure can also reduce the wear and damage of the ore to the limit plate, reduce the frequency of maintenance and replacement, and improve the overall working efficiency and reliability of the equipment.

[0022] Optionally, a shaking assembly is provided on the bracket for causing auxiliary shaking of the screen during the vibration screening process.

[0023] Optionally, the shaking assembly includes a plurality of elastic blocks capable of abutting the screen from bottom to top, and the elastic blocks are vertically slidably connected to the bracket via springs.

[0024] By adopting the above technical solution, the screen box and the screen mesh vibrate synchronously under the drive of the vibrator. The elastic block will produce relative displacement with the screen mesh due to the inertia of the screen box and the elastic potential energy stored in the spring, so that the screen mesh is continuously impacted by the elastic block and produces a certain vibration, which helps to move the ore on the screen mesh, prevents the ore from agglomerating and retaining, and promotes the continuous redistribution of the ore, reduces blockage and uneven screening, makes the screening process smoother and more efficient, improves the overall efficiency of the screening work, and ensures that the ore can pass through the screen mesh more evenly and thoroughly, thereby achieving higher screening quality and production efficiency.

[0025] In summary, compared with the prior art, this application has at least one of the following beneficial technical effects:

[0026] 1. When disassembling and assembling the screen, the screen can be pressed and limited by the cooperation of the pressure plate and the bracket. Compared with the bolt fixing method, it can reduce the operating burden of the personnel, so that the replacement of the screen can be completed quickly. At the same time, the screen can be tightened by the cooperation of the linkage components to ensure the tension of the screen, so as to avoid the screen from vibrating unstably due to relaxation during the screening process, thereby reducing the probability of affecting the screening uniformity.

[0027] 2. After the pressure plate and the bracket cooperate to complete the pressure limit of the screen, with the participation of the locking member, the relative position of the bracket and the pressure plate can be further locked, so that the screen is subjected to a more balanced and stable clamping force during operation, effectively preventing the screen from shifting or loosening due to vibration, impact or pressure changes during the screening process.

[0028] 3. During the ore screening process, the ore's trajectory is adjusted and guided by a retardation diversion method, changing the ore's path during the screening process. This effectively prolongs the ore's residence time on the screen, allowing it more time to contact the screen and achieve more complete screening. At the same time, the retardation diversion also causes the ore to shift longitudinally during its fall, breaking the original straight-line fall state. This promotes a more even distribution of ores of different particle sizes on the screen, avoids excessive accumulation of ore on the screen, and reduces problems such as local blockage and screen hole blockage, thereby improving the continuity and stability of the entire screening process.

[0029] 4. In addition, during the ore screening process, the method of knocking on the screen can effectively enhance the vibration of the screen, thereby causing the screen to shake moderately, so that the ore particles on the screen can move more smoothly, reducing the possibility of clogging the screen holes, so as to ensure the continuity and production efficiency of the screening process, and improve the uniformity of screening to obtain a more accurate particle size distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a multi-stage vibrating screen for this application;

[0031] Figure 2 This is a schematic diagram of the structure of the bracket and pressure plate of this application;

[0032] Figure 3 This is a right side view of the bracket and pressure plate for this application;

[0033] Figure 4 For this application Figure 3 A partial enlarged view of the middle area A;

[0034] Figure 5 A top view of the diverter plate and linkage ribs of this application;

[0035] Figure 6 This is a schematic diagram of the structure of the bracket, pressure plate, linkage rib and locking member of this application;

[0036] Figure 7 This is a schematic diagram of the structure of the locking pin of this application;

[0037] Figure 8 This is a bottom view of the circular lock hole and locking pin of this application.

[0038] Explanation of the accompanying drawings: 1. Screen box; 11. Vibrator; 12. Screen; 2. Bracket; 21. Pressure plate; 211. Diverter plate; 22. Limiting plate; 3. Transition frame; 31. Clamping beam; 311. Circular sliding hole; 32. Linking rib; 33. Driving member; 331. Screw; 4. Locking member; 41. Circular locking hole; 42. Rectangular opening; 43. Locking pin; 5. Guide plate; 6. Protective plate; 7. Shaking assembly; 71. Elastic block; 72. Spring. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application Figures 1-8 , the technical solutions of the embodiments of the present application are clearly and completely described. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of this application.

[0040] Reference Figure 1, this embodiment provides a multi-stage vibrating screen, including a screen box 1, a vibrator 11, a screen 12 and a positioning mechanism for fixing the screen 12. The vibrator 11 and the screen 12 are both arranged inside the screen box 1, and a plurality of screens 12 are arranged in a vertical array. When carrying out ore sorting work, the ore is first transported to the loading end at the upper left corner of the screen box 1 with the help of an external loading device, and then the operation of the vibrator 11 can make the screen box 1 and the screen 12 vibrate together, so that the multiple screens 12 screen the logistics step by step from top to bottom. The vibrator 11 can be in the form of a servo motor driving the vibrator to rotate, and since the vibrator is usually arranged on the screen box 1 and vibrates and displaces with the screen box 1, in order to make the servo motor and the vibrator normally coupled, an interference coupling can be installed between the servo motor and the vibrator to provide a certain compensation effect for the vibrator that is offset due to vibration.

[0041] Among them, reference Figure 2 、 Figure 3 and Figure 4 The positioning mechanism includes a bracket 2, a pressure plate 21, a limiting plate 22, a transition frame 3, a tightening beam 31, a linkage rib 32 and a driving member 33. The bracket 2 and the pressure plate 21 are both provided in plurality inside the screen box 1 and correspond one-to-one to the screen 12. The pressure plate 21 is located above the bracket 2 and a gap is reserved between the two for the screen 12 to be inserted. The limiting plates 22 are provided in plurality in a hinged manner front and back and correspond one-to-one to the screen 12. The front and rear ends of the screen 12 are bent upward and are in the shape of stirrups and are engaged with the bottom edge of the limiting plates 22. The transition frames 3 are provided in plurality on the screen box 1 in the form of sliding connections and correspond one-to-one to the pressure plates 21. Each transition frame 3 is longitudinally slidably connected with two supporting members that can tighten the pressure plate 21. The clamping beam 31 is connected to the limit plate 22, and a plurality of linkage ribs 32 are hinged between the clamping beam 31 and the pressure plate 21. When the transition frame 3 moves to the right, the linkage rib 32 will rotate with its own hinge axis close to the pressure plate 21 as the center, causing the two clamping beams 31 to move away from each other and clamp the two limit plates 22; the driving member 33 includes a screw 331 rotatably connected to the left end of the transition frame 3, and the screw 331 is threadedly connected to the screw hole corresponding to the left inner wall of the screen box 1. When the screw 331 rotates, the transition frame 3 will slide along its own central axis.

[0042] When installing the screen 12, first insert the screen 12 from right to left into the gap between the pressure plate 21 and the bracket 2. During this process, the bottom edge of the limit plate 22 will be embedded in the bent parts at the front and rear ends of the screen 12, and the longitudinal deviation of the screen 12 will be limited by the blocking of the limit plate 22. Then the personnel manually twist the screw 331 to move the transition frame 3 to the right. At this time, the linkage rib 32 can rotate with its own hinge axis on the side close to the pressure plate 21 as the center of the circle, and because the linkage rib 32 has a certain length, the two clamping beams 31 will move away from each other along the transition frame 3 until the clamping beam 31 clamps the limit plate 22 tightly. In this state, the two limit plates 22 can use the bent part of the screen 12 as the force point to longitudinally tighten and fix the screen 12 due to the clamping pressure of the clamping beam 31, so that the screen 12 is in a tensioned state during the subsequent screening process, reducing the possibility of excessive deformation of the screen 12 after being impacted by the ore and affecting the screening effect. When disassembling the screen 12, the personnel twist the screw 331 in the opposite direction to move the transition frame 3 to the left. At this time, the two clamping beams 31 are driven by the linkage ribs 32 to move towards each other, so that the two limit plates 22 release the tightening and fixing state of the screen 12. Finally, the personnel pulls out the screen 12 to the right to complete the disassembly of the screen 12.

[0043] In addition, refer to Figure 1 and Figure 2 The left end of the pressure plate 21 is hingedly arranged on the left inner wall of the screen box 1, and the left end of the pressing beam 31 is provided with a circular sliding hole 311 which can be sleeved on the transition frame 3.

[0044] During the process of dismantling the screen 12, as the transition frame 3 moves to the left, when the hinge shaft at the left end of the pressure plate 21 coincides with the central axis of the circular sliding hole 311 at the left end of the clamping beam 31, the personnel can lift the pressure plate 21 and the right end of the clamping beam 31 together, so that the screen 12 located between the pressure plate 21 and the bracket 2 is exposed. Compared with the method of pulling out the screen 12, the personnel can have a larger operating space, further reducing the difficulty of dismantling the screen 12.

[0045] In addition, refer to Figure 1 and Figure 5 The linkage ribs 32 are all inclined from left to right toward the direction close to the central axis of the pressure plate 21. A plurality of diverter plates 211 are provided on the pressure plate 21, and the diverter plates 211 and the linkage ribs 32 are spaced apart in the transverse direction.

[0046] During the ore screening process, the linkage ribs 32 and the diverter plate 211 cooperate to guide the ore, so that the ore can change its position in the longitudinal direction while moving along the screen 12, thereby promoting the ore to be evenly distributed on the screen 12, so as to avoid excessive accumulation of ore at a certain point on the screen 12 and incomplete screening.

[0047] Reference Figure 6 、 Figure 7 and Figure 8 A locking member 4 is provided between the bracket 2 and the pressure plate 21 for locking or unlocking the relative positions of the bracket 2 and the pressure plate 21. The locking member 4 includes a circular locking hole 41 and a locking pin 43. Multiple circular locking holes 41 are provided on the bracket 2, and the top opening of each circular locking hole 41 is configured as a rectangular opening 42. A locking pin 43 is provided at the bottom end of the hinge shaft on the side of each linkage rib 32 near the pressure plate 21. The locking pin 43 is T-shaped and can be inserted into the rectangular opening 42 at the top of the circular locking hole 41.

[0048] When the screen 12 is placed in the gap between the pressure plate 21 and the bracket 2, the transverse pin body of the locking pin 43 can pass through the rectangular opening 42 and be inserted into the circular locking hole 41. When the transition frame 3 moves to the right and the screen 12 is tightened and fixed through the linkage rib 32, the clamping beam 31 and the limit plate 22, the locking pin 43 can rotate together with the hinge shaft on the linkage rib 32 close to the pressure plate 21 side, so that the transverse pin body of the locking pin 43 and the circular locking hole 41 rotate relative to each other. At this time, the transverse pin body of the locking pin 43 will be circumferentially dislocated with the rectangular opening 42, so that the locking pin 43 is restricted inside the circular locking hole 41 to achieve the relative position locking of the bracket 2 and the pressure plate 21, so that the bracket 2 and the pressure plate 21 have a more stable clamping effect on the screen 12 to prevent the screen 12 from loosening during the subsequent ore screening process. On the contrary, during the disassembly process of the screen 12, when the personnel reversely twists the screw 331 to move the transition frame 3 to the left, the transverse pin body of the rotating locking pin 43 of the linkage rib 32 will be aligned with the rectangular opening 42 in the transverse position again. When the personnel lift the pressure plate 21 and the right end of the clamping beam 31 together, the transverse pin body of the locking pin 43 will be pulled out from the inside of the whole composed of the rectangular opening 42 and the circular locking hole 41, thereby releasing the relative position lock of the bracket 2 and the pressure plate 21 without the need for personnel to perform additional operations.

[0049] Reference Figure 1 and Figure 2 The feed end of the upper left corner of the screen box 1 is hinged with a guide plate 5 for guiding the logistics of the material fed to the screen box 1.

[0050] When the external feeding device delivers ore to the feeding end at the upper left corner of the screen box 1, the guide plate 5 can receive the ore from the external feeding device and provide a gentle diversion path for the ore until the ore is smoothly guided onto the screen 12, thereby preventing the ore from violently impacting the screen 12 during its fall, thereby reducing the possibility of the ore damaging the screen 12. At the same time, the guide plate 5 can provide protection for the bracket 2 and pressure plate 21 below it, reducing the probability of the bracket 2 and pressure plate 21 being damaged and deformed by the impact of the ore.

[0051] Reference Figure 1 、 Figure 2 and Figure 4 , protective plates 6 are provided on the top of the front and rear inner walls of the screen box 1. The protective plates 6 are L-shaped and can be abutted by the step surface on the abutting beam 31 to prevent the ore from impacting the limit plate 22.

[0052] When the clamping beam 31 clamps and fixes the limit plate 22, the step surface on the clamping beam 31 can abut against the protective plate 6, so that the limit plate 22 located inside the protective plate 6 is isolated outside the screening path of the ore, so as to prevent the ore from causing impact damage to the limit plate 22 during the screening process.

[0053] Reference Figure 3 and Figure 6 The bracket 2 is provided with a shaking assembly 7 for assisting the shaking of the screen 12 during the vibratory screening process. The shaking assembly 7 includes a plurality of elastic blocks 71 and a plurality of springs 72. The elastic blocks 71 are vertically slidably connected to the bracket 2 via the springs 72. The elastic blocks 71 can abut against the elastic blocks 71 of the screen 12 from bottom to top under the elastic potential energy of the springs 72.

[0054] Driven by the vibrator 11, the screen box 1 and the screen 12 vibrate together. During this process, the elastic block 71 is affected by the inertial force generated by the movement of the screen box 1 and the elastic potential energy stored in the spring 72, and will be displaced relative to the screen 12. This relative movement causes the elastic block 71 to continuously contact the screen 12, generating a continuous impact force, thereby causing the screen 12 to vibrate. On the one hand, it can effectively prevent the accumulation and aggregation of ore on the screen, and avoid the retention or blockage of materials in a certain area; on the other hand, the shaking can promote the smoother movement of ore on the screen, which helps to achieve rapid screening and grading of ore, thereby ensuring the continuity and efficiency of the screening process, and effectively reducing the occurrence of uneven screening or blockage.

[0055] The implementation principle of a multi-stage vibrating screen in the embodiment of the present application is:

[0056] When carrying out ore sorting work, the ore is first transported to the loading end of the upper left corner of the screen box 1 with the help of an external loading device. At this time, the guide plate 5 can receive and guide the ore, so that the ore can slide along the guide plate 5 to the screen 12, so as to prevent the bracket 2 and the pressure plate 21 located below the guide plate 5 from being damaged by the impact of the ore.

[0057] Then the operation of the vibrator 11 can make the screen box 1 and the screen 12 vibrate together, so that the multiple screens 12 can screen the logistics step by step from top to bottom. In this process, the linkage ribs 32 and the diverter plate 211 cooperate to guide the ore, so that the ore can change its position in the longitudinal direction while moving along the screen 12, so as to promote the uniform distribution of the ore on the screen 12, so as to avoid excessive accumulation of ore at a certain point on the screen 12 and incomplete screening. In the process of the vibrator 11 driving the screen box 1 and the screen 12 to vibrate together, the elastic block 71 will be relatively displaced with the screen 12 due to the inertia of the screen box 1 and the elastic potential energy of the spring 72, so that the screen 12 is continuously impacted by the elastic block 71 and vibrates to a certain extent, reducing the possibility of ore aggregation and retention on the screen 12, thereby improving the efficiency of ore screening.

[0058] When installing the screen 12, first insert the screen 12 from right to left into the gap between the pressure plate 21 and the bracket 2. During this process, the bottom edge of the limit plate 22 will be embedded in the bent parts at the front and rear ends of the screen 12, and the longitudinal deviation of the screen 12 will be limited by the blocking of the limit plate 22. Then the personnel manually twist the screw 331 to move the transition frame 3 to the right. At this time, the linkage rib 32 can rotate with its own hinge axis on the side close to the pressure plate 21 as the center of the circle, and because the linkage rib 32 has a certain length, the two clamping beams 31 will move away from each other along the transition frame 3 until the clamping beam 31 clamps the limit plate 22 tightly. In this state, the two limit plates 22 can use the bent part of the screen 12 as the force point to longitudinally tighten and fix the screen 12 due to the clamping pressure of the clamping beam 31, so that the screen 12 is in a tensioned state during the subsequent screening process, reducing the possibility of excessive deformation of the screen 12 after being impacted by the ore and affecting the screening effect. When disassembling the screen 12, the personnel twist the screw 331 in the opposite direction to move the transition frame 3 to the left. At this time, the two clamping beams 31 are driven by the linkage ribs 32 to move towards each other, so that the two limit plates 22 release the tightening and fixing state of the screen 12. Finally, the personnel pulls out the screen 12 to the right to complete the disassembly of the screen 12.

[0059] During the process of dismantling the screen 12, as the transition frame 3 moves to the left, when the hinge shaft at the left end of the pressure plate 21 coincides with the central axis of the circular sliding hole 311 at the left end of the clamping beam 31, the personnel can lift the pressure plate 21 and the right end of the clamping beam 31 together, so that the screen 12 located between the pressure plate 21 and the bracket 2 is exposed. Compared with the method of pulling out the screen 12, the personnel can have a larger operating space, further reducing the difficulty of dismantling the screen 12.

[0060] In addition, when the screen 12 is placed in the gap between the pressure plate 21 and the bracket 2, the transverse pin body of the locking pin 43 can pass through the rectangular opening 42 and be inserted into the circular locking hole 41. When the transition frame 3 moves to the right and the screen 12 is tightened and fixed through the linkage rib 32, the clamping beam 31 and the limit plate 22, the locking pin 43 can rotate together with the hinge shaft on the linkage rib 32 close to the pressure plate 21 side, so that the transverse pin body of the locking pin 43 and the circular locking hole 41 rotate relative to each other. At this time, the transverse pin body of the locking pin 43 will be circumferentially dislocated with the rectangular opening 42, so that the locking pin 43 is restricted inside the circular locking hole 41 and the relative position of the bracket 2 and the pressure plate 21 is locked, so that the bracket 2 and the pressure plate 21 have a more stable clamping effect on the screen 12 to prevent the screen 12 from loosening during the subsequent ore screening process. On the contrary, during the disassembly process of the screen 12, when the personnel reversely twists the screw 331 to move the transition frame 3 to the left, the transverse pin body of the rotating locking pin 43 of the linkage rib 32 will be aligned with the rectangular opening 42 in the transverse position again. When the personnel lift the pressure plate 21 and the right end of the clamping beam 31 together, the transverse pin body of the locking pin 43 will be pulled out from the inside of the whole composed of the rectangular opening 42 and the circular locking hole 41, thereby releasing the relative position lock of the bracket 2 and the pressure plate 21 without the need for personnel to perform additional operations.

[0061] When the clamping beam 31 clamps and fixes the limit plate 22, the step surface on the clamping beam 31 can abut against the protective plate 6, so that the limit plate 22 located inside the protective plate 6 is isolated outside the screening path of the ore, so as to prevent the ore from causing impact damage to the limit plate 22 during the screening process.

[0062] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A multi-stage vibrating screen, comprising a screen box (1) and a vibrator (11) and a plurality of screens (12) arranged therein, wherein the plurality of screens (12) are arranged in a vertical array inside the screen box (1), characterized in that: The screen box (1) is provided with a plurality of brackets (2) corresponding one-to-one with the screen mesh (12) inside, and a plurality of pressure plates (21) corresponding one-to-one with the screen mesh (12) and located above the brackets (2) are provided inside the screen box (1), and a gap for inserting the screen mesh (12) is retained between the brackets (2) and the pressure plates (21), and a plurality of limiting plates (22) corresponding one-to-one with the screen mesh (12) are hinged to the front and rear inner walls of the screen box (1), and the front and rear ends of the screen mesh (12) are bent upward and are arranged in a stirrup shape to be embedded with the bottom edge of the limiting plate (22); The screen box (1) is slidably connected to a plurality of transition frames (3) corresponding one to one with the pressure plate (21), and the transition frames (3) are longitudinally slidably connected to two abutting beams (31) capable of abutting against the limit plates (22), and a plurality of linkage ribs (32) are hinged between the abutting beams (31) and the pressure plate (21), and a driving member (33) for driving the transition frames (3) to move laterally is provided on the screen box (1).

2. A multi-stage vibrating screen according to claim 1, characterized in that: The left end of the pressure plate (21) is hingedly arranged on the left inner wall of the screen box (1), and the left end of the abutting beam (31) is provided with a circular sliding hole (311) that can be sleeved on the transition frame (3).

3. The multi-stage vibrating screen according to claim 1, characterized in that: The linkage ribs (32) are all arranged obliquely from left to right in a direction close to the central axis of the pressure plate (21). The pressure plate (21) is provided with a plurality of diverter plates (211), and the diverter plates (211) and the linkage ribs (32) are arranged at intervals in the transverse direction.

4. The multi-stage vibrating screen according to claim 1, characterized in that: The driving member (33) comprises a screw rod (331) rotatably connected to the left end of the transition frame (3), and the screw rod (331) is threadedly connected to a screw hole correspondingly opened on the left inner wall of the screen box (1).

5. The multi-stage vibrating screen according to claim 1, characterized in that: A locking member (4) is provided between the bracket (2) and the pressure plate (21) for locking the relative position of the bracket (2) and the pressure plate (21) or releasing the relative position locking of the bracket (2) and the pressure plate (21).

6. The multi-stage vibrating screen according to claim 5, characterized in that: The locking member (4) includes a circular locking hole (41) formed on the bracket (2), and a top opening of the circular locking hole (41) is configured as a rectangular opening (42). A locking pin (43) is provided at the bottom end of the hinge shaft on the linkage rib (32) near the pressure plate (21). The locking pin (43) is T-shaped and can be inserted into the rectangular opening (42) at the top of the circular locking hole (41).

7. The multi-stage vibrating screen according to claim 1, characterized in that: A guide plate (5) is hingedly connected to the feed end at the upper left corner of the screen box (1) for guiding the flow of materials fed to the screen box (1).

8. The multi-stage vibrating screen according to claim 2, characterized in that: The tops of the front and rear inner walls of the screen box (1) are both provided with protective plates (6), which are arranged in an L-shape and can be abutted against the stepped surface on the abutting beam (31) to prevent the ore from impacting the limit plate (22).

9. The multi-stage vibrating screen according to claim 1, characterized in that: The bracket (2) is provided with a shaking assembly (7) for causing the screen (12) to undergo auxiliary shaking during the vibration screening process.

10. The multi-stage vibrating screen according to claim 9, characterized in that: The shaking assembly (7) comprises a plurality of elastic blocks (71) capable of abutting against the screen (12) from bottom to top, and the elastic blocks (71) are vertically slidably connected to the bracket (2) via springs (72).

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