A multi-stage screening device and method for high-purity molybdenum concentrate

Abstract

The present invention relates to the field of ore screening devices, specifically to a multi-stage screening device and method for high-purity molybdenum concentrate, comprising a frame, wherein the upper inner end of the frame is provided with screen plates at equal intervals along the length direction of the frame, the frame is provided with a switching mechanism for quickly replacing and turning over the screen plates, and a call-back mechanism for moving the ore. The present invention adopts the cooperation of the rotating plate in the call-back mechanism with the grading shovel block, which can push the upper layer of ore in the opposite direction of the ore movement direction, so that the ore stacked on the upper layer is pushed to separate from the ore on the lower layer, effectively breaking the stacking and bridging phenomenon of molybdenite flaky particles. When the present invention adopts the grading shovel block to push the ore, it can push the ore in the middle layer of the multi-layer stacked ore, and at the same time shovel the ore of the upper layer and throw it onto the sieve plate. By separately processing the multi-layer stacked ore, the stacking and bridging phenomenon of the molybdenite flaky particles is further avoided.

Description

Technical Field

[0001] The present invention relates to the field of ore screening devices, and in particular to a multi-stage screening device and method for high-purity molybdenum concentrate. Background Art

[0002] High-purity molybdenum concentrate is an important industrial raw material, widely used in metallurgy, chemical industry, electronics and other fields. Its main component is molybdenite, which has high hardness and often has a flaky structure.

[0003] At present, circular vibrating screens are mainly used for screening molybdenite. During screening, the device drives the polarization block to rotate through a motor, causing the screen to vibrate. The ore is then transported by a conveyor belt and spread onto the surface of the upper screen. Under the action of vibration, the ore jumps forward on the screen surface, and fine particles fall through the screen, while larger particles move along the screen surface to the discharge end, and then the particles are graded through screens of different apertures.

[0004] However, due to the flaky structure of molybdenite, it is prone to stacking or bridging during the screening process. That is, the flaky particles spread horizontally under the action of vibration and stack on each other to form a bridge layer, resulting in a large area of ​​the screen surface being covered, hindering the screening of fine particles. Existing circular vibrating screens lack effective solutions to this problem, resulting in reduced screening accuracy and output.

[0005] In addition, the high hardness of molybdenite accelerates the wear of the screen. By turning the screen over regularly, the screen can be changed to withstand the impact and friction of the molybdenite, significantly extending the service life of the screen. However, existing devices usually use an integral screen, which is large in size and the turning operation is cumbersome, resulting in long downtime and reduced screening efficiency.

[0006] In a circular vibrating screen, the area of ​​the top screen near the conveyor belt outlet is subject to continuous impact and friction when the ore falls, and its local wear rate is significantly faster than other areas. As a result, when the integral screen is replaced, the area on the screen away from the conveyor belt outlet still has the screening capacity, which reduces the utilization rate of the screen and increases production costs. Summary of the Invention

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a multi-stage screening device and method for high-purity molybdenum concentrate, including a frame, screen plates are arranged at equal intervals on the upper inner end of the frame along the length direction of the frame, and the frame is provided with a switching mechanism for quickly replacing and turning over the screen plates, as well as a dial-back mechanism for moving the ore.

[0008] The shifting mechanism includes several groups of ring plates arranged at equal intervals on the frame through a moving component, each group consists of two ring plates arranged symmetrically in front and back, the sieve plate is connected and locked to the corresponding group of ring plates by plugging, and two brackets arranged symmetrically in front and back are provided on the frame through a guide component, and several material clamping grooves are opened on the upper side of the bracket at equal intervals along the length direction of the frame.

[0009] The moving assembly drives all the sieve plates to move up synchronously through the ring plate, and then the operator conveniently turns over all the sieve plates. The operator moves the bracket along the guide assembly so that all the sieve plates move to the right synchronously, making it easy to replace the rightmost sieve plate to the leftmost.

[0010] The dial-back mechanism includes an H-shaped frame that is slidably arranged on the inner side of the frame at equal intervals along the length direction of the frame. The H-shaped frame corresponds to the screen plate one by one. A rotating row plate is rotatably arranged on the upper side of the H-shaped frame for dialing the upper ore to the right.

[0011] Preferably, the moving assembly includes two displacement plates that are symmetrically arranged front and back and slide forward and backward on the outside of the frame. Several lifting plates that slide up and down are arranged at equal intervals along the length direction of the displacement plate, and the upper side of the lifting plate is rotatably connected to the ring plate at the corresponding position.

[0012] Preferably, a linkage rod is fixedly installed on the lower sides of the corresponding left and right lifting plates, and two guide slot blocks arranged symmetrically front and back are fixedly installed on the lower end of the outer side of the frame, and the linkage rod slides inside the slot of the corresponding guide slot block.

[0013] Preferably, the guide assembly includes two groups of track grooves opened on the front and rear sides of the frame, and two groups of raised columns are fixedly installed on the side of the bracket close to the frame, and each group of raised columns is slidably connected to the inside of the corresponding track groove.

[0014] Preferably, a triangular block with an upward inclined surface is fixedly installed on the left side of the bracket, and two blocking blocks arranged symmetrically front and back are provided on the frame for left and right sliding. A return spring is provided between the blocking block and the frame, and the two brackets are located between the two displacement plates.

[0015] Preferably, a supporting rod is fixedly mounted on the lower end of the bracket away from the frame, the supporting rod is located at the lower part of the linkage rod, and linkage plates are fixedly mounted on the outer sides of the supporting rods on the front and rear sides.

[0016] Preferably, the rotating plate is hinged with grading shovel blocks of the same number as the rotating plate through a support frame, and a waist-shaped groove is provided on the grading shovel block. A driving plate is provided on the rotating plate for radial sliding. The end of the driving plate away from the axis of the rotating plate is slidably connected to the inside of the waist-shaped groove.

[0017] Preferably, two fixed columns arranged symmetrically front and back are fixedly installed on the inner upper end of the H-shaped frame, and the fixed columns are rotatably connected inside the coaxial line of the rotating plate. A cam groove is opened at the end of the fixed columns close to each other, and the end of the driving plate close to the axis of the rotating plate is slidably connected inside the cam groove.

[0018] Preferably, the inner side surface of the frame is provided with equidistant grooves along its length direction, and the H-shaped frame is slidably connected to the inside of the groove along the width direction of the corresponding groove, and the width of the groove gradually shortens from left to right. A push rod is provided on the lower side of the H-shaped frame for common sliding, and a coil spring is provided between the push rod and each H-shaped frame.

[0019] Preferably, the present invention also provides a multi-stage screening method for high-purity molybdenum concentrate, and the specific screening method steps are as follows: S1. The ore is transported to the upper right side of the frame by a conveyor belt, so that the ore falls onto the screen plate. As the ore moves to the left under the action of gravity, the ore is screened by multiple screen plates.

[0020] S2. The rotating plate rotates in the opposite direction of the ore moving direction, so that the rotating plate pushes the upper layer of ore stacked together, increases the screening of fine ore, and increases the pushing effect on the ore by moving the H-shaped frame left and right.

[0021] S3. After the machine is shut down, the operator moves the bracket along the guide assembly so that the bracket lifts all the screen plates. The operator then moves the rightmost screen plate to the leftmost side of the bracket and moves the bracket along the guide assembly again so that the bracket drives the entire screen plate to move right.

[0022] S4. After the machine stops, the operator moves all the sieve plates synchronously with the ring plate by moving the components, and then the operator turns over all the sieve plates, and then the operator moves the sieve plates downward to reset them, making full use of both sides of the sieve plates for screening.

[0023] The beneficial effects of the present invention are: 1. The present invention adopts the cooperation of the rotating plate and the grading shovel block in the return mechanism, which can push the upper ore in the opposite direction of the ore movement direction, so that the ore stacked on the upper layer is pushed to separate from the ore on the lower layer, effectively breaking the stacking and bridging phenomenon of the molybdenite flaky particles, and through the reciprocating movement of several H-shaped frames with different strokes, it can increase the pushing effect on the upper ore while ensuring the ore flow speed, and significantly improve the screening accuracy and output.

[0024] 2. When the present invention uses the grading shovel block to push the ore, it can push the ore in the middle layer of the multi-layer stacked ore, and at the same time shovel the ore in the upper layer to its upper side, so that the ore in the upper layer is lifted by the grading shovel block, and then the driving plate pulls the grading shovel block along the trajectory of the cam groove to flip the ore in the upper layer, so that the ore in the upper layer is thrown onto the screen plate. By separately processing the multi-layer stacked ore, the stacking and bridging of the molybdenite flaky particles are further avoided.

[0025] 3. The present invention adopts a linkage design of multiple sieve plates and a transposition mechanism. The lifting plate and the ring plate of the moving assembly cooperate to synchronously lift the sieve plate, so that the sieve plate can be quickly moved up and separated from the frame, thereby facilitating the operator to turn over the sieve plate, simplifying the maintenance process, shortening the downtime, and improving the screening efficiency.

[0026] 4. The present invention uses a precise match between the track groove and the raised column of the guide assembly, so that the bracket can move unidirectionally along the track groove, so that the bracket can lift all the screen plates synchronously and automatically separate the ring plate from the screen plate. Then the operator moves the screen plate closest to the conveyor belt position to the material slot on the bracket farthest from the conveyor belt position, thereby making full use of each screen plate, increasing the utilization rate of the screen mesh, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and examples.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 It is a cross-sectional view of the screen plate, fixed column, push rod and rotating row plate in the present invention.

[0030] Figure 3 It is a cross-sectional view of the rotating row plate, grading shovel blocks, fixed columns and driving plates in the present invention.

[0031] Figure 4 It is a cross-sectional view of the rotating row plate, the driving plate, the fixed column and the cam groove in the present invention.

[0032] Figure 5 It is a structural schematic diagram of the frame, H-shaped frame, give way groove and track groove in the present invention.

[0033] Figure 6 It is a structural schematic diagram of the frame, screen plate, bracket and guide groove block in the present invention.

[0034] Figure 7 It is a partial structural diagram of the frame, bracket, triangle block and blocking block in the present invention.

[0035] In the figure: 1. frame; 2. sieve plate; 3. shifting mechanism; 4. call-back mechanism; 31. moving assembly; 32. ring plate; 33. guide assembly; 34. bracket; 35. clamping trough; 41. H-shaped frame; 42. rotating row plate; 43. clearance groove; 311. displacement plate; 312. lifting plate; 313. linkage rod; 314. guide groove block; 331. track groove; 332. raised column; 333. triangular block; 334. blocking block; 335. supporting rod; 336. linkage plate; 411. fixed column; 412. cam groove; 421. grading shovel block; 422. driving plate; 431. pushing rod. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention are described in detail. The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in the art or in the product specifications shall be followed.

[0037] See Figure 1 A multi-stage screening device for high-purity molybdenum concentrate includes a frame 1, sieve plates 2 are arranged at equal intervals along the length direction of the frame 1 at the upper inner end of the frame 1, and a switching mechanism 3 for quickly replacing and turning over the sieve plates 2, as well as a dialing mechanism 4 for moving the ore are provided on the frame 1.

[0038] It should be noted that a partition plate is fixedly installed at the upper end of the inner side of the frame 1, and through grooves for placing the sieve plate 2 are opened at equal intervals along the length direction of the frame 1. When the sieve plate 2 is placed inside the through grooves, the frame of the sieve plate 2 is embedded in the interior of the partition plate, and the upper side surface of the sieve plate 2 is flush with the upper side surface of the partition plate.

[0039] It should be noted that the inner side of the frame 1 is detachably installed with a secondary screening plate and a tertiary screening plate from top to bottom. The secondary screening plate is located at the lower part of the partition plate, and the sieve hole diameters on the sieve plate 2, the secondary screening plate and the tertiary screening plate gradually decrease.

[0040] In this embodiment, a polarization block is rotatably provided at the lower part of the frame 1, and the front end of the polarization block is connected to an asynchronous motor through a flexible coupling. The polarization block is driven to rotate by the asynchronous motor, so that the frame 1 drives the screen plate 2, the secondary screening plate and the tertiary screening plate thereon to vibrate synchronously.

[0041] When molybdenite needs to be screened, the asynchronous motor is started first, and then the molybdenite is transported and spread to the upper right side of the frame 1 by the conveyor belt, so that the molybdenite first falls onto the rightmost screen plate 2, and then the ore moves to the left along the upper side of the screen plate 2 and the partition plate under the action of gravity. The ore with a smaller diameter passes downward through the screen plate 2 and falls onto the secondary screen plate, and continues to move to the left along the upper side of the secondary screen plate. The ore with a smaller diameter on the secondary screen plate passes downward through the secondary screen plate and falls to the tertiary screen plate, and continues to move to the left along the upper side of the tertiary screen plate.

[0042] As the ore moves to the left along the upper side of the screen plate 2 and the partition plate, the return mechanism 4 intermittently pushes the ore in the opposite direction of the ore's movement, so that the stacked molybdenite flaky particles are broken, preventing the screen plate 2 from being covered over a large area, which is conducive to the smaller ore particles passing through the screen downward.

[0043] When the rightmost sieve plate 2 is severely worn, the machine is stopped and the rightmost sieve plate 2 is quickly moved to the leftmost part through the position conversion mechanism 3. At the same time, the remaining sieve plates 2 are moved to the right as a whole, so that the second sieve plate 2 from right to left is located closest to the conveyor belt, thereby making full use of each sieve plate 2.

[0044] When the upper side surfaces of all the sieve plates 2 are severely worn, all the sieve plates 2 are moved upward as a whole through the repositioning mechanism 3, and then all the sieve plates 2 are quickly turned over manually, and then all the sieve plates 2 are reset, so that both sides of the sieve plates 2 can withstand wear and ensure the screening efficiency.

[0045] See Figure 1 、 Figure 2 and Figure 3 The return mechanism 4 includes an H-shaped frame 41 that is slidably arranged on the inner side of the frame 1 at equal intervals along the length direction of the frame 1. The H-shaped frame 41 corresponds to the screen plate 2 one by one. A rotating row plate 42 is rotatably arranged on the upper side of the H-shaped frame 41 for moving the upper ore to the right.

[0046] In this embodiment, a rotating motor is fixedly mounted on the lower end of the inner side surface of the H-shaped frame 41 , and the output shaft of the rotating motor is connected to the rotating plate 42 via a belt.

[0047] See Figure 3 and Figure 4 The rotating plate 42 is hinged with grading shovel blocks 421 with the same number as the rotating plate 42 through a support frame. A waist-shaped groove is provided on the grading shovel block 421. A driving plate 422 is provided on the rotating plate 42 for sliding along its radial direction. The end of the driving plate 422 away from the axis of the rotating plate 42 is slidably connected to the inside of the waist-shaped groove.

[0048] Continue reading Figure 3 and Figure 4Two fixed columns 411 arranged symmetrically front and back are fixedly installed on the inner upper end of the H-shaped frame 41. The fixed columns 411 are rotatably connected to the coaxial line of the rotating plate 42. A cam groove 412 is opened at the end of the fixed columns 411 close to each other, and the end of the driving plate 422 close to the axis of the rotating plate 42 is slidably connected to the inside of the cam groove 412.

[0049] It should be noted that the left portion of the cam slot 412 is far away from the axis of the fixing post 411 , and the right portion of the cam slot 412 is close to the axis of the fixing post 411 .

[0050] When the ore moves to the left along the upper side of the screen plate 2 and the partition plate, the rotating motor is started to drive the rotating plate 42 to rotate, so that the lower part of the rotating plate 42 rotates to the right, and the rotating plate 42 drives the grading shovel block 421 thereon to rotate synchronously through the support plate frame, and the rotating plate 42 drives the driving plate 422 to rotate synchronously, so that the end of the driving plate 422 close to the axis of the rotating plate 42 moves along the trajectory of the cam groove 412.

[0051] When the grading shovel block 421 rotates to the lower part of the axis of the rotating row plate 42, the end of the driving plate 422 close to the axis of the rotating row plate 42 is located inside the part of the cam groove 412 away from the axis of the fixed column 411, so that the driving plate 422 pushes the grading shovel block 421 in the direction away from the axis of the fixed column 411, so that the angle between the grading shovel block 421 and the rotating row plate 42 is an acute angle.

[0052] Then the grading shovel block 421 pushes the stacked ores in the opposite direction of the ore movement through its side, so that the lower layer of ore continues to move to the left under the action of gravity, the middle layer of ore is pushed to separate from the lower layer of ore, and the upper layer of ore is shoveled between the grading shovel block 421 and the rotating row plate 42, so that the rotating row plate 42 and the grading shovel block 421 jointly lift the ore.

[0053] Then, one end of the driving plate 422 close to the axis of the rotating row plate 42 moves to the inside of the part of the cam groove 412 close to the axis of the fixed column 411, so that the driving plate 422 pulls the grading shovel block 421 to rotate, causing the angle between the grading shovel block 421 and the rotating row plate 42 to become an obtuse angle, thereby causing the ore between the grading shovel block 421 and the rotating row plate 42 to slide, and then the ore is thrown onto the screen plate 2. By separately processing the multi-layer stacked ores, the stacking and bridging of the molybdenite flaky particles are further avoided.

[0054] See Figure 1 、 Figure 2 and Figure 5On the inner side surface of the frame 1, there are evenly spaced clearance grooves 43 along its length direction. The H-shaped frame 41 is slidably connected to the inside of the clearance groove 43 along the width direction of the corresponding clearance groove 43. The width of the clearance groove 43 gradually shortens from left to right. A push rod 431 is slidingly provided on the lower side of the H-shaped frame 41. A coil spring is provided between the push rod 431 and each H-shaped frame 41.

[0055] In this embodiment, a hydraulic cylinder is fixedly installed on the left end of the inner side surface of the frame 1, and the telescopic section of the hydraulic cylinder is fixedly connected to the push rod 431.

[0056] When the ore moves to the left along the upper side of the screen plate 2 and the partition plate, the telescopic section of the reciprocating hydraulic cylinder drives the push rod 431 to move synchronously. When the push rod 431 moves to the right, the push rod 431 pushes the H-shaped frame 41 to move synchronously through the coil spring. The H-shaped frame 41 drives the rotating row plate 42 and the grading shovel block 421 to move synchronously, thereby increasing the pushing effect of the grading shovel block 421 on the ore.

[0057] As the width of the give way slot 43 from left to right gradually shortens, the H-shaped frame 41 from right to left is blocked by the side of the give way slot 43 and cannot move further, so that the moving stroke of the H-shaped frame 41 from right to left increases successively, and then the pushing amount of the ore by the rotating row plate 42 from right to left increases successively. Since the total amount of ore on the upper part of the screen plate 2 gradually decreases as the ore moves to the left for screening, the method of gradually increasing the pushing amount of the ore from right to left not only ensures the screening efficiency of the ore, but also improves the screening accuracy.

[0058] See Figure 1 、 Figure 5 、 Figure 6 and Figure 7 The shifting mechanism 3 includes several groups of ring plates 32 arranged at equal intervals on the frame 1 through a moving component 31. Each group consists of two ring plates 32 arranged symmetrically in front and back. The sieve plate 2 is connected and locked to the corresponding group of ring plates 32 by plugging. Two brackets 34 arranged symmetrically in front and back are provided on the frame 1 through a guide component 33. Several material clamping grooves 35 are opened on the upper side of the bracket 34 at equal intervals along the length direction of the frame 1.

[0059] The moving assembly 31 drives all the sieve plates 2 to move upward synchronously through the ring plate 32, and then the operator conveniently turns over all the sieve plates 2. The operator moves the bracket 34 along the guide assembly 33, so that all the sieve plates 2 move to the right synchronously, making it easier to move the rightmost sieve plate 2 to the leftmost part.

[0060] It should be noted that a rotating shaft is fixedly installed on both the front and rear sides of the sieve plate 2, and fixed blocks are fixedly installed on both the front and rear ends of the rotating shaft of the sieve plate 2. The fixed blocks act as keys, and a keyway for inserting the fixed block is reserved at the position corresponding to the inner side of the ring plate 32. When the rotating shaft of the sieve plate 2 is inserted into the interior of the ring plate 32, the fixed block extends into the keyway, so that the sieve plate 2 and the ring plate 32 can rotate synchronously.

[0061] It should be noted that the front and rear sides of the material slot 35 are waist groove structures that pass upward through the upper side of the bracket 34, and the middle part of the material slot 35 is a rectangular structure that passes upward through the upper side of the bracket 34. The front and rear sides of the rotating shaft of the screen plate 2 are respectively fixed with rectangular plates for inserting into the middle part of the material slot 35.

[0062] See Figure 1 The moving assembly 31 includes two displacement plates 311 that are symmetrically arranged on the outside of the frame 1 and slide forward and backward. A number of lifting plates 312 that slide up and down are arranged at equal intervals along the length direction of the displacement plate 311. The upper side of the lifting plate 312 is rotatably connected to the ring plate 32 at the corresponding position.

[0063] See Figure 1 and Figure 6 A linkage rod 313 is fixedly installed on the lower side of the corresponding left and right lifting plates 312, and two guide slot blocks 314 arranged symmetrically front and back are fixedly installed on the lower end of the outer side of the frame 1. The linkage rod 313 slides inside the groove of the corresponding guide slot block 314.

[0064] In this embodiment, the lower portion of the slot of the guide slot block 314 is a straight line structure arranged in the up-down direction, and the upper portion of the slot of the guide slot block 314 is an oblique slot structure gradually inclined from bottom to top away from the rack 1 .

[0065] It should be noted that a positioning pin is slidably inserted on the displacement plate 311, and all the lifting plates 312 on the displacement plate 311 are locked together with the displacement plate 311 by the positioning pin being inserted into the displacement plate 311 and a lifting plate 312 at the corresponding position.

[0066] When the positioning pin locks the lifting plate 312 and the displacement plate 311, the lifting plate 312 drives the linkage rod 313 to be located at the bottom of the linear structure of the notch of the guide groove block 314, so that the displacement plate 311 cannot drive the lifting plate 312 to move forward and backward at this time, thereby locking the displacement plate 311, the lifting plate 312 and the frame 1 into a whole, and at this time, the lifting plate 312 drives the sieve plate 2 to be embedded into the interior of the partition plate through the ring plate 32, so that the sieve plate 2 cannot rotate, which makes the sieve plate 2 also locked into a whole with the frame 1.

[0067] See Figure 1 、 Figure 5 and Figure 6, the guiding component 33 includes two groups of track grooves 331 opened on the front and rear sides of the frame 1. Each group consists of two track grooves 331 arranged left and right and in a rectangular structure. On the side of the bracket 34 close to the frame 1, two groups of protruding columns 332 are fixedly installed. Each group consists of two protruding columns 332 arranged up and down. Each group of protruding columns 332 is slidably connected inside a corresponding track groove 331.

[0068] It should be noted that the horizontal section of the track groove 331 in the rectangular structure is parallel to the length direction of the frame 1, and the vertical section of the track groove 331 is perpendicular to the length direction of the frame 1.

[0069] Refer to Figure 1 、 Figure 6 and Figure 7 , on the left side of the bracket 34, a triangular block 333 with an upward slope is fixedly installed. On the frame 1, two blocking blocks 334 arranged symmetrically front and back are slidably arranged left and right. A return spring is arranged between the blocking block 334 and the frame 1. The two brackets 34 are located between the two displacement plates 311.

[0070] Refer to Figure 1 and Figure 6 , at the lower end of the side of the bracket 34 away from the frame 1, a supporting rod 335 is fixedly installed. The supporting rod 335 is located at the lower part of the linkage rod 313. On the outer sides of the front and rear supporting rods 335, a linkage plate 336 is fixedly installed together.

[0071] When it is necessary to replace the sieve plate 2, stop the machine. Then the operator manually pulls out the positioning pin. Next, the operator moves the linkage plate 336 upward through the hoisting equipment, so that the linkage plate 336 drives the brackets 34 on both sides to move upward synchronously through the supporting rods 335. When the clamping grooves 35 on the brackets 34 move to the outside of the rectangular plate on the rotating shaft of the sieve plate 2, the supporting rods 335 move synchronously to abut against the lower part of the linkage rod 313.

[0072] At this time, the rightmost clamping groove 3� corresponds to the rotating shaft of the rightmost sieve plate 2, and the leftmost clamping groove 35 is empty, and the rotation of the sieve plate 2 is restricted by the blocking of the rectangular plate on the rotating shaft of the sieve plate 2 by the clamping groove 35.

[0073] Then continue to move the linkage plate 336 upward, so that the bracket 34 drives the protruding columns 332 thereon to move upward along the left and right vertical sections of the corresponding track groove 331. When the supporting rod 335 pushes the linkage rod 313 to move to the uppermost part of the straight-line structure of the notch of the guide groove block 314, the bracket 34 drives the sieve plate 2 to move upward to the upper part of the frame 1. Then move the linkage plate 336 upward again, so that the supporting rod 335 pushes the linkage rod 313 to move along the inclined groove structure of the notch of the guide groove block 314 in the direction away from the frame 1.

[0074] When the linkage rod 313 moves to the top of the inclined groove structure of the guide groove block 314, the linkage rod 313 drives the lifting plate 312 and the ring plate 32 to move away from the sieve plate 2, so that the sieve plate 2 can be taken out from the ring plate 32. At this time, the bracket 34 drives the raised column 332 to move up to the two horizontal section positions corresponding to the upper part of the track groove 331.

[0075] When the linkage rod 313 moves to the top of the inclined groove structure of the guide groove block 314, the bracket 34 drives the triangular block 333 thereon to push the blocking block 334 to the left. When the linkage rod 313 moves to the top of the inclined groove structure of the guide groove block 314, the bracket 34 drives the triangular block 333 thereon to move completely to the upper part of the blocking block 334, so that the blocking block 334 moves to the initial position under the push of the return spring's own elastic force and blocks the lower part of the triangular block 333, so that the bracket 34 cannot move downward.

[0076] Then the operator uses the lifting equipment to lift the rightmost screen plate 2 to the leftmost clamping groove 35 of the bracket 34, and then uses the lifting equipment to pull the right linkage plate 336 again, so that the linkage plate 336 drives the bracket 34 to move to the right along the upper two horizontal sections of the track groove 331, and makes the bracket 34 move to the right with all the screen plates 2 synchronously.

[0077] When the raised column 332 on the bracket 34 moves to the rightmost part of the two upper horizontal sections of the track groove 331, the bracket 34 drives the raised column 332 to move downward along the vertical section of the right part of the track groove 331 under the action of gravity. At this time, all the sieve plates 2 move to the right as a whole to correspond one-to-one with the through grooves on the partition plate. When the bracket 34 moves downward, the lifting plate 312 moves downward synchronously along the notch of the guide groove block 314 under the action of gravity.

[0078] When the raised column 332 on the bracket 34 moves to the lowest part of the right vertical section of the track groove 331, the sieve plate 2 is placed on the through groove on the partition plate, thereby completing the overall replacement of the sieve plate 2, and allowing the lifting plate 312 to drive the ring plate 32 to be plugged into the rotating shaft of the sieve plate 2 again. The operator manually inserts the positioning pin into the displacement plate 311 and the lifting plate 312, and then removes the external force on the linkage plate 336, so that the bracket 34 slides to the left along the lower horizontal section of the track groove 331 to the initial position under the action of gravity.

[0079] In this embodiment, the upper end of the lifting plate 312 is a circular structure, and a semicircular ring is fixedly installed at the lower end of the circular structure of the lifting plate 312 away from the frame 1. The eccentric positions of all the corresponding ring plates 32 on the left and right are hinged with a synchronization plate. In the initial state, the hinge point between the synchronization plate and the ring plate 32 is located on the left side of the corresponding ring plate 32 axis, and the lower side of the synchronization plate rests on the semicircular ring.

[0080] When the rightmost sieve plate 2 is worn after the transposition, the above transposition steps are repeated, causing all the sieve plates 2 to be worn. Then the operator uses the lifting equipment to move the linkage rod 313 upward to the uppermost part of the linear structure of the guide groove block 314. Then the operator manually pushes the synchronization plate to the right, so that the synchronization plate drives the left and right sieve plates 2 to rotate half a circle through the ring plate 32, and then resets the linkage rod 313 downward, thereby completing the quick flipping of the sieve plate 2.

[0081] See Figures 1 to 7 In addition, the present invention also provides a multi-stage screening method for high-purity molybdenum concentrate, and the specific screening method steps are as follows: S1, start the asynchronous motor, and then transport the molybdenite through the conveyor belt and spread it to the upper right side of the frame 1, so that the molybdenite moves to the left along the screen plate 2, the secondary screen plate, and the tertiary screen plate while screening the ore.

[0082] S2. Start the rotating motor to drive the rotating plate 42 to rotate, so that the rotating plate 42 pushes the ore through the grading shovel block 421, thereby processing the multi-layer stacked ore separately, further avoiding the stacking and bridging of the molybdenite flaky particles, and reciprocating the telescopic section of the hydraulic cylinder to increase the pushing effect of the grading shovel block 421 on the ore.

[0083] S3. When the sieve plate 2 is replaced, the positioning pin is pulled out and the linkage plate 336 is moved upward, so that the bracket 34 drives the sieve plate 2 to move up to the upper part of the frame 1, and at the same time the ring plate 32 is moved to separate from the sieve plate 2. The operator lifts the rightmost sieve plate 2 to the leftmost clamping groove 35 of the bracket 34, pulls the linkage plate 336 to the right, and resets the bracket 34 along the track groove 331, thereby completing the overall replacement of the sieve plate 2.

[0084] S4. When the rightmost sieve plate 2 after the transposition is worn, repeat S3 to make all the sieve plates 2 worn. Then the operator moves the linkage rod 313 upwards to the uppermost part of the linear structure of the guide groove block 314 through the lifting equipment. Then the operator manually pushes the synchronization plate to the right, so that the synchronization plate drives the left and right sieve plates 2 to rotate half a circle through the ring plate 32, and then resets the linkage rod 313 downward, thereby completing the quick flipping of the sieve plate 2.

[0085] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, which are still covered by the scope of protection of the present invention.

Claims

1. A high-purity molybdenum concentrate multi-stage screening device, comprising a frame, characterized in that: Screen plates are arranged at equal intervals on the upper inner end of the frame along the length of the frame. The frame is equipped with a switching mechanism for quickly replacing and turning over the screen plates, as well as a dialing mechanism for moving the ore. The shifting mechanism includes a plurality of groups of ring plates arranged at equal intervals on the frame through a moving assembly, each group consisting of two ring plates arranged symmetrically in front and back, the sieve plate is connected and locked to the corresponding group of ring plates by plugging, and two brackets arranged symmetrically in front and back are provided on the frame through a guide assembly, and a plurality of material clamping grooves are opened on the upper side of the brackets at equal intervals along the length direction of the frame; The moving assembly drives all the sieve plates to move upward synchronously through the ring plate, then turns all the sieve plates over, and moves the bracket along the guide assembly so that all the sieve plates move right synchronously, and the rightmost sieve plate is swapped to the leftmost one; The return mechanism includes an H-shaped frame slidably arranged on the inner side of the frame at equal intervals along the length direction of the frame, the H-shaped frame corresponds to the screen plate one by one, and a rotating row plate is rotatably arranged on the upper side of the H-shaped frame for shifting the upper ore to the right; The rotating plate is hinged with grading shovel blocks of the same number as the rotating plate through a support frame, and a waist-shaped groove is opened on the grading shovel block. A driving plate is provided on the rotating plate for radial sliding. The end of the driving plate away from the axis of the rotating plate is slidably connected to the inside of the waist-shaped groove.

2. A high-purity molybdenum concentrate multi-stage screening device according to claim 1, characterized in that: The moving assembly includes two symmetrically arranged displacement plates that slide forward and backward on the outside of the frame. Several lifting plates that slide up and down are arranged at equal intervals along the length direction of the displacement plate. The upper side of the lifting plate is rotatably connected to the ring plate at the corresponding position.

3. A high-purity molybdenum concentrate multi-stage screening device according to claim 2, characterized in that: A linkage rod is fixedly installed on the lower sides of the corresponding left and right lifting plates. Two guide slot blocks arranged symmetrically front and back are fixedly installed on the lower end of the outer side of the frame. The linkage rod slides inside the notch of the corresponding guide slot block.

4. A high-purity molybdenum concentrate multi-stage screening device according to claim 3, characterized in that: The guide assembly includes two groups of track grooves opened on the front and rear sides of the frame. Two groups of protruding columns are fixedly installed on the side of the bracket close to the frame. Each group of protruding columns is slidably connected to the corresponding track groove.

5. A high-purity molybdenum concentrate multi-stage screening device according to claim 4, characterized in that: A triangular block with an upwardly inclined surface is fixedly installed on the left side of the bracket. Two blocking blocks arranged symmetrically front and back are provided on the frame for left and right sliding. A return spring is provided between the blocking block and the frame. The two brackets are located between the two displacement plates.

6. A high-purity molybdenum concentrate multi-stage screening device according to claim 4, characterized in that: A supporting rod is fixedly installed on the lower end of the bracket away from the frame. The supporting rod is located at the lower part of the linkage rod. Linkage plates are fixedly installed on the outer sides of the supporting rods on the front and rear sides.

7. A high-purity molybdenum concentrate multi-stage screening device according to claim 1, characterized in that: Two fixed columns arranged symmetrically front and back are fixedly installed on the inner upper end of the H-shaped frame. The fixed columns are rotatably connected to the coaxial line of the rotating plate. A cam groove is opened at the end of the fixed columns close to each other, and the end of the driving plate close to the axis of the rotating plate is slidably connected to the inside of the cam groove.

8. The high-purity molybdenum concentrate multi-stage screening device according to claim 1, characterized in that: The inner side surface of the frame is provided with equal intervals along its length direction. The H-shaped frame is slidably connected to the inside of the groove along the width direction of the corresponding groove. The width of the groove gradually shortens from left to right. A push rod is provided on the lower side of the H-shaped frame for common sliding. A coil spring is provided between the push rod and each H-shaped frame.

9. A method for multi-stage screening of high-purity molybdenum concentrate, using the multi-stage screening device for high-purity molybdenum concentrate according to any one of claims 1 to 8, characterized in that: The specific screening method steps are as follows: S1. The ore is transported to the upper right side of the frame by a conveyor belt, so that the ore falls onto the screen plate. As the ore moves to the left under the action of gravity, it is screened by multiple screen plates; S2. The rotating plate rotates in the opposite direction of the ore moving direction, so that the rotating plate pushes the upper layer of ore stacked together, increasing the screening of fine ore, and the H-shaped frame moves left and right to increase the pushing effect on the ore; S3. After the machine is stopped, the operator moves the bracket along the guide assembly so that the bracket lifts all the screen plates. The operator then moves the rightmost screen plate to the leftmost side of the bracket and moves the bracket along the guide assembly again so that the bracket drives the entire screen plate to move rightward. S4. After the machine is shut down, the operator moves all the sieve plates up by moving the components and the ring plate, then the operator turns over all the sieve plates, and then the operator moves the sieve plates down to reset them, making full use of both sides of the sieve plates for screening.

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