Multi-stage screening device and method for high-purity molybdenum concentrate

Abstract

The invention relates to the field of ore screening devices, in particular to a high-purity molybdenum concentrate multi-stage screening device and method.The high-purity molybdenum concentrate multi-stage screening device comprises a rack, screen plates are arranged at the upper end of the inner side of the rack in the length direction of the rack at equal intervals, and a transposition mechanism for rapidly replacing and turning over the screen plates and a back-shifting mechanism for shifting ores are arranged on the rack; according to the invention, a rotating row plate in the back-shifting mechanism is matched with the grading shovel block, so that the ores on the upper layer can be pushed in the reverse direction of the ore moving direction, the ores stacked on the upper layer are pushed to be separated from the ores on the lower layer, and the stacking and bridging phenomena of molybdenite flaky particles are effectively broken; according to the multi-layer stacked ore shoveling and throwing device, the middle-layer ore in the multi-layer stacked ore can be pushed, meanwhile, the upper-layer ore is shoveled and thrown onto the sieve plate, the multi-layer stacked ore is treated separately, and the stacking and bridging phenomena of molybdenite flaky particles are further avoided.

Description

Technical Field

[0001] The invention relates to the field of ore screening devices, and in particular to a high-purity molybdenum concentrate multi-stage screening device and method. 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 screen is 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, fine particles fall through the screen, and larger particles move along the screen surface to the discharge end, and then particle classification is achieved through screens with 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, stacked 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. The existing circular vibrating screen lacks an effective solution 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, which can significantly extend 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 wears significantly faster than other areas due to the continuous impact and friction when the ore falls. As a result, when the integral screen is replaced, the area on the screen far away from the conveyor belt outlet still has the ability to screen, 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 inner upper 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, and a return mechanism for moving the ore.

[0008] The commutation mechanism includes several groups of ring plates arranged at equal intervals on the frame through a moving component. Each group consists of two symmetrically arranged ring plates in the front and back. The sieve plate is connected and locked to the corresponding group of ring plates in a plug-in manner. There are two symmetrically arranged brackets in the front and back on the frame through a guiding component. A number of material clamping grooves are arranged at equal intervals along the length direction of the frame on the upper side of the brackets.

[0009] The moving component drives all the sieve plates to move up synchronously through the ring plates. Subsequently, the operator can conveniently turn over all the sieve plates. The operator moves the brackets along the guiding component, making all the sieve plates move right synchronously, facilitating the commutation of the rightmost sieve plate to the leftmost.

[0010] The return mechanism includes an H-shaped frame slidably arranged at equal intervals along the length direction of the frame inside the frame. The H-shaped frame corresponds to the sieve plate one by one. A rotating discharge plate for pushing the upper-layer ore to the right is rotatably arranged on the upper side of the H-shaped frame.

[0011] Preferably, the moving component includes two symmetrically arranged displacement plates slidably arranged in the front and back on the outside of the frame. A number of lifting plates sliding up and down are arranged at equal intervals along the length direction of the displacement plates. 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 left and right corresponding lifting plates together. Two symmetrically arranged guide groove blocks are fixedly installed at the lower end outside the frame. The linkage rod slides inside the notch of the corresponding guide groove block.

[0013] Preferably, the guiding component includes two groups of track grooves arranged on the front and back side surfaces of the frame. Two groups of convex columns are fixedly installed on the side of the bracket close to the frame. Each group of convex columns is slidably connected inside the corresponding track groove.

[0014] Preferably, a triangular block with an upward slope is fixedly installed on the left side of the bracket. Two symmetrically arranged blocking blocks are slidably arranged left and right on the frame. A return spring is arranged between the blocking block and the frame. The two brackets are located between the two displacement plates.

[0015] Preferably, a supporting rod is fixedly installed at the lower end of the side of the bracket away from the frame. The supporting rod is located below the linkage rod. A linkage plate is fixedly installed together on the outer sides of the front and back supporting rods.

[0016] Preferably, a number of grading shovel blocks equal to the number of the discharge plates of the rotating discharge plate are hinged on the rotating discharge plate through a support plate frame. A waist-shaped groove is arranged on the grading shovel block. A driving plate is slidably arranged along the radial direction of the rotating discharge plate. One end of the driving plate away from the axis of the rotating discharge plate is slidably connected inside 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, the fixed columns are rotatably connected inside the coaxial line of the rotating plate arrangement, a cam groove is opened at one end of the fixed columns close to each other, and the end of the driving plate close to the axis of the rotating plate arrangement 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 inside 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 slidably provided on the lower side of the H-shaped frame, 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, and 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 shutdown, the operator moves the bracket along the guide assembly so that the bracket lifts all the screen plates, and then the operator 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 shutdown, the operator moves all the sieve plates synchronously with the ring plate by moving the assembly, and then the operator turns over all the sieve plates, and then the operator moves down and resets the sieve plates, making full use of both sides of the sieve plates for screening.

[0023] The beneficial effects of the present invention are as follows: 1. The present invention adopts the cooperation of the rotating row 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 be separated 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 a 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 to flip along the trajectory of the cam groove, 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 mobile 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] Fourth, 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 card slot of 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 is further described below in conjunction with the accompanying drawings and embodiments.

[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, the fixed column, the push rod and the rotating row plate in the present invention.

[0030] Figure 3 It is a cross-sectional view of the rotating row plate, the grading shovel block, the fixed column and the driving plate 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 schematic 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 groove; 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. triangle 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 embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in the art or the product specifications are used.

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

[0038] It should be noted that a partition plate is fixedly installed at the upper inner end 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 in the through grooves, the frame of the sieve plate 2 is embedded in 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 diameters of the sieve holes 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 arranged at the lower part of the frame 1, and an asynchronous motor is connected to the front end of the polarization block 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 it is necessary to screen the molybdenite, first start the asynchronous motor, then transport the molybdenite by the conveyor belt and spread it to the upper right of the frame 1, 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, and the ore with a smaller diameter passes through the screen plate 2 downward and falls onto the secondary screen plate, and continues to move to the left along the upper side of the secondary screen plate, and the ore with a smaller diameter on the secondary screen plate passes through the secondary screen plate downward and falls onto 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 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 to pass 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 position conversion mechanism 3, and then all the sieve plates 2 are quickly turned over manually and then reset, so that both sides of the sieve plates 2 are used to withstand wear, thereby ensuring the screening efficiency.

[0045] See also Figure 1 , Figure 2 and Figure 3 The return mechanism 4 includes an H-shaped frame 41 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 for shifting the upper ore to the right is rotatably arranged on the upper side of the H-shaped frame 41.

[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 row plate 42 via a belt.

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

[0048] Continue reading Figure 3 and Figure 4, at the upper inner side of the H-shaped frame 41, two fixing columns 411 arranged symmetrically front and back are fixedly installed. The fixing columns 411 are rotatably connected inside the coaxial line of the rotating discharge plate 42. Cam grooves 412 are formed at the ends of the fixing columns 411 close to each other. One end of the driving plate 422 close to the axis of the rotating discharge plate 42 is slidably connected inside the cam groove 412.

[0049] It should be noted that the left part of the cam groove 412 is far from the axis of the fixing column 411, and the right part of the cam groove 412 is close to the axis of the fixing column 411.

[0050] When the ore moves leftward along the upper side of the sieve plate 2 and the partition plate, start the rotating motor to drive the rotating discharge plate 42 to rotate, so that the lower part of the rotating discharge plate 42 rotates rightward. The rotating discharge plate 42 drives the grading shovel blocks 421 thereon to rotate synchronously through the support plate frame. The rotating discharge plate 42 drives the driving plate 422 to rotate synchronously, so that one end of the driving plate 422 close to the axis of the rotating discharge plate 42 moves along the track of the cam groove 412.

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

[0052] After that, the grading shovel block 421 pushes the stacked ore in the reverse direction of the ore movement direction through its side surface, so that the lower-layer ore continues to move leftward under the action of gravity, the middle-layer ore is pushed to be separated from the lower-layer ore, and the upper-layer ore is shoveled between the grading shovel block 421 and the rotating discharge plate 42, so that the rotating discharge 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 discharge plate 42 moves into the part of the cam groove 412 close to the axis of the fixing column 411, so that the driving plate 422 pulls the grading shovel block 421 to rotate, causing the included angle between the grading shovel block 421 and the rotating discharge plate 42 to change to an obtuse angle, so that the ore between the grading shovel block 421 and the rotating discharge plate 42 slides off, and then the ore is sprinkled onto the sieve plate 2. By separately processing the multi-layer stacked ore, the lamination and bridging phenomena of molybdenite flaky particles are further avoided.

[0054] Refer to Figure 1 、 Figure 2 and Figure 5The inner side surface of the frame 1 is provided with equal intervals of clearance grooves 43 along its length direction, and the H-shaped frame 41 is slidably connected inside the clearance groove 43 along the width direction of the corresponding clearance groove 43, and the width of the clearance groove 43 gradually shortens from left to right. A push rod 431 is slidably provided at the lower side of the H-shaped frame 41, and 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 telescopic hydraulic cylinder causes the hydraulic cylinder to drive the push rod 431 to move synchronously. When the push rod 431 moves to the right, the push rod 431 drives the H-shaped frame 41 to move synchronously through the spiral 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 groove 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 groove 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 also Figure 1 , Figure 5 , Figure 6 and Figure 7 The shifting mechanism 3 includes a plurality of groups of ring plates 32 arranged at equal intervals on the frame 1 through a moving assembly 31, each group is composed of two ring plates 32 arranged symmetrically front and back, and the sieve plate 2 is connected and locked to a corresponding group of ring plates 32 by plugging. Two brackets 34 arranged symmetrically front and back are provided on the frame 1 through a guide assembly 33, and a plurality of card slots 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 right synchronously, making it easy to replace the rightmost sieve plate 2 to the leftmost part.

[0060] It should be noted that rotating shafts are fixedly installed on both the front and rear sides of the sieve plate 2. Fixed blocks are fixedly installed at the front and rear ends of the rotating shaft of the sieve plate 2. The fixed blocks act as keys. Key grooves for inserting them are reserved at positions on the inner side surface of the annular plate 32 corresponding to the fixed blocks. After the rotating shaft of the sieve plate 2 is inserted into the inside of the annular plate 32, the fixed blocks extend into the key grooves, enabling the sieve plate 2 and the annular plate 32 to rotate synchronously.

[0061] It should be noted that the front and rear sides of the material clamping groove 35 are of a waist-shaped groove structure that penetrates upward through the upper side surface of the bracket 34, and the middle part of the material clamping groove 35 is of a rectangular structure that penetrates upward through the upper side surface of the bracket 34. Rectangular plates for inserting into the middle part of the material clamping groove 35 are respectively fixedly installed on the front and rear sides of the rotating shaft of the sieve plate 2.

[0062] Refer to Figure 1 , the moving assembly 31 includes two displacement plates 311 that are symmetrically arranged front and rear and slide back and forth on the outside of the frame 1. 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 sides of the lifting plates 312 are rotatably connected to the annular plates 32 at corresponding positions.

[0063] Refer to Figure 1 and Figure 6 , the lower sides of the left and right corresponding lifting plates 312 are jointly fixedly installed with a linkage rod 313. Two guide groove blocks 314 that are symmetrically arranged front and rear are fixedly installed at the lower end of the outside of the frame 1. The linkage rod 313 slides inside the notch of the corresponding guide groove block 314.

[0064] In this embodiment, the lower part of the notch of the guide groove block 314 is of a linear structure arranged along the up and down direction, and the upper part of the notch of the guide groove block 314 is of an inclined groove structure that gradually inclines away from the frame 1 from bottom to top.

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

[0066] And 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 back and forth at this time. Furthermore, the displacement plate 311, the lifting plate 312 and the frame 1 are locked into a whole. And at this time, the lifting plate 312 drives the sieve plate 2 to be embedded into the inside of the partition plate through the annular plate 32, making the sieve plate 2 unable to rotate. This makes the sieve plate 2 also locked into a whole with the frame 1.

[0067] Refer to Figure 1 , Figure 5 and Figure 6, the guiding assembly 33 includes two sets of track grooves 331 opened on the front and rear sides of the frame 1. Each set 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 sets of protruding columns 332 are fixedly installed. Each set consists of two protruding columns 332 arranged up and down. Each set 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 rear and sliding left and right are provided. A return spring is provided 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 the sieve plate 2 needs to be transposed, 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 35 corresponds to the rotating shaft of the rightmost sieve plate 2, and the leftmost clamping groove 35 is empty. And through the blocking of the rectangular plate on the rotating shaft of the sieve plate 2 by the clamping groove 35, the rotation of the sieve plate 2 is restricted.

[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 a direction away from the frame 1.

[0074] When the linkage rod 313 moves to the top of the inclined groove structure at the notch 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, enabling the sieve plate 2 to be removed from the ring plate 32. At this time, the bracket 34 drives the convex column 332 upward to the positions of the two horizontal segments above the corresponding track groove 331.

[0075] During the process of the linkage rod 313 moving to the top of the inclined groove structure at the notch 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 at the notch of the guide groove block 314, the bracket 34 drives the triangular block 333 thereon to completely move above the blocking block 334, causing the blocking block 334 to move to the initial position under the pushing force of the self-elastic force of the return spring and block below the triangular block 333, preventing the bracket 34 from moving downward.

[0076] Subsequently, the operator uses a hoisting device to hoist the rightmost sieve plate 2 into the material clamping groove 35 at the leftmost part of the bracket 34, and then uses the hoisting device to pull the right moving linkage plate 336 again, causing the linkage plate 336 to drive the bracket 34 to move rightward along the two upper horizontal segments of the track groove 331, and causing all the sieve plates 2 carried by the bracket 34 to move rightward synchronously.

[0077] When the convex column 332 on the bracket 34 moves to the rightmost part of the two upper horizontal segments of the track groove 331, the bracket 34 drives the convex column 332 to move downward along the vertical segment on the right of the track groove 331 under the action of gravity. At this time, all the sieve plates 2 move rightward as a whole to correspond to the through grooves on the partition plate one by one. 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 convex column 332 on the bracket 34 moves to the lowermost part of the vertical segment on the right of the track groove 331, the sieve plate 2 is placed on the through groove on the partition plate, thus completing the overall transposition of the sieve plate 2, and causing the lifting plate 312 to drive the ring plate 32 to be inserted 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, causing the bracket 34 to slide leftward along the lower horizontal segment 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 of a circular structure. A semi-circular ring is fixedly installed at the lower end of the circular structure of the lifting plate 312 on the side away from the frame 1. Synchronous plates are jointly hinged at the eccentric positions of all the ring plates 32 corresponding to the left and right. In the initial state, the hinge point of the synchronous plate and the ring plate 32 is located on the left of the axis of the corresponding ring plate 32, and the lower side of the synchronous plate abuts against the semi-circular ring.

[0080] After the rightmost sieve plate 2 after transposition is worn, repeat the above transposition steps until all the sieve plates 2 are worn. Then, the operator moves the linkage rod 313 upward through the hoisting equipment to the uppermost part of the linear structure of the notch of the guide groove block 314. Then, the operator manually pushes the synchronous plate to the right, so that the synchronous plate drives the left and right sieve plates 2 to rotate half a turn through the ring plate 32. Then, the linkage rod 313 is reset downward, thus completing the quick turning over of the sieve plate 2.

[0081] Refer to Figures 1 to 7 , in addition, the present invention also provides a multi-stage screening method for high-purity molybdenum concentrate ore. The specific screening method steps are as follows: S1. Start the asynchronous motor, and then transport and spread the molybdenite ore to the upper right of the frame 1 through the conveyor belt, so that the molybdenite ore is screened while moving leftward along the sieve plate 2, the secondary screening plate, and the tertiary screening plate.

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

[0083] S3. When the sieve plate 2 is transposed, pull out the positioning pin and move the linkage plate 336 upward, so that the bracket 34 drives the sieve plate 2 to move upward to the upper part of the frame 1, and at the same time, the ring plate 32 moves away from the sieve plate 2. The operator hoists the rightmost sieve plate 2 into the material clamping groove 35 at the leftmost part of the bracket 34, and pulls the linkage plate 336 to the right, so that the bracket 34 is reset along the track groove 331, thus completing the overall transposition of the sieve plate 2.

[0084] S4. After the rightmost sieve plate 2 after transposition is worn, repeat S3 to wear all the sieve plates 2. Then, the operator moves the linkage rod 313 upward through the hoisting equipment to the uppermost part of the linear structure of the notch of the guide groove block 314. Then, the operator manually pushes the synchronous plate to the right, so that the synchronous plate drives the left and right sieve plates 2 to rotate half a turn through the ring plate 32. Then, the linkage rod 313 is reset downward, thus completing the quick turning over of the sieve plate 2.

[0085] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and still be covered by the protection scope 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 side of the frame along the length direction of the frame. The frame is provided with a transposition mechanism for quickly replacing and turning over the screen plates, as well as a return mechanism for moving the ore. The shifting mechanism comprises a plurality of groups of ring plates arranged at equal intervals on the frame through a moving assembly, each group is composed of two ring plates arranged symmetrically in front and back, the sieve plate is connected and locked on the corresponding group of ring plates by plugging, and two brackets arranged symmetrically in front and back are arranged on the frame through a guide assembly, and a plurality of material clamping grooves are opened at equal intervals on the upper side of the bracket 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 over all the sieve plates, and moves the bracket along the guide assembly so that all the sieve plates move right synchronously, and the rightmost sieve plate is replaced to the leftmost part; The return mechanism includes an H-shaped frame slidably arranged at equal intervals on the inner side of the frame along the length direction of the frame, the H-shaped frame corresponds to the screen plate one by one, and a rotating row plate for shifting the upper ore to the right is rotatably arranged on the upper side of the H-shaped frame.

2. A high-purity molybdenum concentrate multi-stage screening device according to claim 1, characterized in that: The moving assembly includes two displacement plates symmetrically arranged front and back on the outside of the frame for sliding back and forth, and a plurality of lifting plates sliding 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.

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 lifting plates on the left and right sides, and two guide slot blocks symmetrically arranged front and back are fixedly installed on the lower end of the outer side of the frame, and 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 comprises two groups of track grooves opened on the front and rear sides of the frame, and two groups of protruding columns are fixedly installed on one side of the bracket close to the frame, and each group of protruding columns is slidably connected inside 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, and two blocking blocks symmetrically arranged front and back are arranged on the frame for left and right sliding. A return spring is arranged between the blocking block and the frame, and 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 at 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 installed on the outer sides of the supporting rods at the front and rear sides.

7. A high-purity molybdenum concentrate multi-stage screening device according to claim 1, characterized in that: 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 movement, and one end of the driving plate away from the axis of the rotating plate is slidably connected inside the waist-shaped groove.

8. A high-purity molybdenum concentrate multi-stage screening device according to claim 7, 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 inside the coaxial line of the rotating plate arrangement. Cam grooves are opened at the ends of the fixed columns close to each other, and the end of the driving plate close to the axis of the rotating plate arrangement is slidably connected inside the cam groove.

9. A 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 equidistant grooves along its length direction, and the H-shaped frame is slidably connected inside 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 slidably provided on the lower side of the H-shaped frame, and a coil spring is provided between the push rod and each H-shaped frame.

10. 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 9, 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, the ore 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, increases the screening of fine ore, and increases the pushing effect on the ore by moving the H-shaped frame left and right; S3. After the machine is stopped, the operator moves the bracket along the guide assembly so that the bracket lifts all the screen plates, and then the operator 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 shutdown, the operator moves all the sieve plates up by moving the components and the ring plate, then turns over all the sieve plates, and then moves down and resets the sieve plates, making full use of both sides of the sieve plates for screening.

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