An ore pulp screening apparatus

Abstract

A kind of ore pulp screening equipment, including concentration kettle and vibrating screening device, the vibrating screening device includes fixed support and screening platform, screening platform is installed on fixed support by high-frequency vibration system and low-frequency swing system, the top surface of the screening platform is concave to form a flow guide disc, cavity is formed in the screening platform below the flow guide disc to form a flow guide hopper, the side of the screening platform is provided with ore discharge opening and is communicated with the outlet of flow guide hopper, the screening platform is provided with the water discharge area of the size matched with the bottom surface of concentration kettle in the center of flow guide disc, the water discharge area is covered with water discharge hole, water discharge hole is communicated with the inlet of flow guide hopper, limiting frame for limiting concentration kettle is symmetrically arranged in the periphery of water discharge area in flow guide disc, the device does not need manual operation in sampling screening process, can realize automatic screening, process is simple, easy to operate, meet industrial production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore dressing, in particular to a mineral pulp screening device. BACKGROUND

[0002] Since the flotation technology was produced in the late 19th century, it has been developed and improved for more than a hundred years, and flotation has become the main means of ore dressing. The particle size of minerals is one of the key factors affecting mineral flotation. Studies have shown that the optimal particle size range of froth flotation is between 5-75 μm. The upper limit of the flotation particle size of high-density minerals is 0.1-0.3 mm; the corresponding upper limit of the flotation particle size of low-density minerals is 0.3-0.5 mm. Too fine or too coarse particle size is not conducive to the flotation recovery of minerals. The research results of Trhar show that the flotation particle size limits of cassiterite, wolframite, barite, fluorite and quartz are 3-20 μm, 20-50 μm, 10-30 μm, 10-90 μm and 9-50 μm, respectively. When the particle size is out of the optimal range, the flotation indexes of both sulfide ores and oxidized ores will deteriorate significantly. A large number of research results show that different particle sizes have different flotation rates, and the particle size outside the optimal flotation size range has a significantly smaller flotation rate coefficient (numerical value). Therefore, the particle size composition information of the feed ore has an important influence on the subsequent flotation indexes, and it is particularly important to obtain reliable, accurate and real-time information reflecting the current particle size composition of the mineral pulp in the ore dressing plant.

[0003] Currently, there are many methods for measuring particle size, such as screening method, sedimentation method, microscope method, Malvern laser particle size measurement, Kurt full-automatic particle size analysis, particle counter analysis, and inductive method. In scientific research, the screening method and the Malvern laser particle size measurement method are two commonly used particle size measurement methods. The screening method is the most common and intuitive method for particle size measurement, and it has the advantages of simple principle, intuitive operation, easy implementation, and most ore dressing plants determine the particle size by the screening method, and the production indexes are also based on the screening method, which is an important reason for its wide application. The traditional screening method is realized by manually vibrating the screen in water, but this method has poor precision and low reliability. Therefore, there is an urgent need for a simple, direct and reliable mineral pulp screening device for the current ore dressing plant. SUMMARY

[0004] The present application solves the problems of the prior art and provides a high-efficiency, reliable and low-cost mineral pulp screening device for realizing automatic screening of ore samples in an ore dressing plant by high-low frequency motion coupling.

[0005] In order to achieve the above object, the present application firstly provides a mineral pulp screening device, which comprises a concentration kettle and a vibrating screening device, the vibrating screening device comprises a fixed support and a screening platform, the screening platform is installed on the fixed support through a high-frequency vibration system and a low-frequency swing system, the top surface of the screening platform is concave to form a flow guide disc, a cavity is arranged in the screening platform below the flow guide disc to form a flow guide hopper, the side surface of the screening platform is provided with a mineral discharge port which is communicated with the outlet of the flow guide hopper, the center of the screening platform is provided with a drainage area which is matched with the bottom surface of the concentration kettle, the drainage area is covered with drainage holes which are communicated with the inlet of the flow guide hopper, and a limiting frame is arranged in the flow guide disc and symmetrically arranged at the periphery of the drainage area to limit the concentration kettle.

[0006] In the embodiment, the high-frequency vibration system comprises a plurality of springs and a vibrating motor, the bottom of the screening platform is fixed on the fixed support through the plurality of springs which are vertically arranged, the plurality of springs are symmetrically arranged around the central axis of the screening platform, the vibrating end of the vibrating motor is installed on the bottom of the screening platform, the low-frequency swing system comprises a speed reducer and an eccentric wheel, the speed reducer is fixed on the fixed support, the rotating shaft of the speed reducer is vertically arranged, the eccentric wheel is fixed on the rotating shaft,

[0007] In the embodiment, the bottom of the screening platform and the top of the fixed support are respectively provided with guide rods which are fixed at the positions where the springs are installed, the two ends of the springs are sleeved on the guide rods and fixed with the guide rods, and the length of the spring is greater than the total length of the two guide rods.

[0008] In the embodiment, the concentration kettle comprises a sample separation sieve, an outer cylinder and an inner cylinder, the outer diameter of the inner cylinder is matched with the inner diameter of the outer cylinder, the inner cylinder is slidingly inserted into the outer cylinder and can rotate in the outer cylinder, the sample separation sieve is installed in the inner cylinder and the outer diameter of the sample separation sieve is matched with the inner diameter of the inner cylinder, a plurality of center-symmetrically arranged and size-matched fan-shaped through holes are arranged on the bottom plate of the bottom of the outer cylinder and the inner cylinder to form liquid outlets, the bottom plate of the outer cylinder and the inner cylinder forms a fan-shaped valve plate between the adjacent fan-shaped through holes, the area of the fan-shaped valve plate is greater than the area of the liquid outlet, the outer cylinder and the inner cylinder are relatively rotated to form a valve structure, in the open state of the valve, the liquid outlets of the outer cylinder and the inner cylinder are overlapped, in the closed state of the valve, the liquid outlets of the outer cylinder and the inner cylinder are staggered arranged, so that the fan-shaped valve plate of the inner cylinder seals the liquid outlet on the outer cylinder, and the outer cylinder and the inner cylinder are further provided with a limiting structure which facilitates stable rotation of the outer cylinder and the inner cylinder.

[0009] In the embodiment, the limiting structure comprises two sliding grooves symmetrically arranged on the outer cylinder and arranged along the circumferential direction, and a sliding block fixed to the outside of the inner cylinder and matched with the sliding grooves, the inner cylinder is slidingly arranged in the sliding grooves of the outer cylinder through the sliding block, one end of the sliding groove is the opening end of the valve, and the other end is the closing end of the valve, when the sliding block slides to the opening end of the sliding groove, the liquid outlet of the outer cylinder overlaps with the liquid outlet of the inner cylinder, when the sliding block slides to the closing end of the sliding groove, the fan-shaped valve plate of the inner cylinder seals the liquid outlet on the outer cylinder, the outside of the outer cylinder is externally provided with a positioning frame corresponding to the limiting frame at the opening end of the sliding groove, the inside of the positioning frame is provided with a positioning cavity matched with the size of the sliding block, and the side of the positioning frame facing the sliding groove is provided with an opening communicated with the positioning cavity, and the sliding block slides into the positioning cavity of the positioning frame in the opening state of the valve.

[0010] In the embodiment, the limiting frame of the flow guide disc is internally provided with a positioning groove matched with the size of the positioning frame, the inlet of the positioning groove is arranged at the top of the limiting frame, the positioning frame of the concentration kettle is inserted into the positioning groove of the limiting frame after the concentration kettle is placed in the drainage area, and the limiting of the concentration kettle is realized.

[0011] In the embodiment, a plurality of flushing water holes are uniformly arranged in the flow guide disc, around the drainage area, and taking the drainage area as the center, a water inlet is arranged on the side surface of the screening platform, and a water guide channel is arranged in the screening platform to communicate the water inlet with the flushing water holes.

[0012] In the embodiment, a lever is further fixed to the outside of the inner cylinder, the lever is slidingly arranged in the sliding groove, and the lever does not slide into the positioning frame when the sliding block slides into the positioning cavity of the positioning frame.

[0013] In the embodiment, a sampling water supply system is further arranged above the vibrating screening device, the sampling water supply system comprises a sampling system for guiding the ore pulp and a water supply system for guiding the clean water, the outlets of the sampling system and the water supply system are connected with a total liquid outlet pipe through a three-way joint, the total liquid outlet pipe is arranged directly above the drainage area, and the outlet of the total liquid outlet pipe faces the opening of the concentration kettle.

[0014] In the embodiment, the sampling system comprises a feeding pipe and a first flow meter and a first electromagnetic valve arranged on the feeding pipe, the water supply system comprises a water supply pipe and a second flow meter and a second electromagnetic valve arranged on the water supply pipe, the outlets of the water supply pipe and the feeding pipe are connected with the total liquid outlet pipe through a three-way joint, and the first flow meter, the first electromagnetic valve, the second flow meter and the second electromagnetic valve are connected with the control system.

[0015] Due to the above structure, the present application has the following advantages:

[0016] 1、The device utilizes the valve structure at the bottom of the outer cylinder and the inner cylinder to realize the opening and closing of the concentration kettle, without adopting the pouring mode, only needs to open the valve, and the ore pulp can flow out from the bottom of the concentration kettle and directly into the flow guide disc, and the clean water continuously entering the flow guide disc from the flushing water hole can adjust the liquid level in the flow guide disc, so that the screening operation in the actual ore dressing plant is simulated, the automatic screening of the ore pulp is realized, the clean water can enter the bottom of the concentration kettle to flush the screen of the concentration kettle, so that the ore pulp can be discharged, the screening of the ore pulp is performed, and the concentration kettle is re-flushed, and the efficiency of concentration measurement is greatly improved.

[0017] 2、The concentration kettle adopts a special design, utilizes the valve structure at the bottom of the outer cylinder and the inner cylinder to realize the opening and closing of the concentration kettle, without adopting the pouring mode, only needs to open the valve, and the ore pulp can flow out from the bottom of the concentration kettle and directly into the flow guide disc, and the clean water entering the flow guide disc from the flushing water hole can also enter the bottom of the concentration kettle to flush the screen of the concentration kettle, so that the ore pulp can be discharged, the screening of the ore pulp is performed, and the concentration kettle is re-flushed, and the efficiency of concentration measurement is greatly improved.

[0018] 3、The vibrating screening device adopts the principle of combining vibrating screening and shaking screening, can deeply screen the particles in the ore pulp, is more accurate than single vibrating screening or shaking screening, provides more accurate feeding particle size information for subsequent ore dressing plants, deeply screens through the low-frequency swing generated by the eccentric wheel rotating with the motor and the flushing water, can simulate the screening operation in the actual ore dressing plant, and further strengthens the screening efficiency through the high-frequency vibration of the vibrating motor, replaces the mechanical operation of repeatedly vibrating by workers, realizes the automatic screening of the ore pulp, and meets industrialized production.

[0019] 4、The design of the flow guide disc and the flushing water hole makes the cleaning process more efficient, the ore pulp can be quickly discharged from the concentration kettle, and the cleaning time is reduced.

[0020] In summary, the device does not need manual operation in the sampling and screening process, can realize automatic screening, has a simple process and convenient operation, and meets industrialized production. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the present application;

[0022] Figure 2 It is a top view of the screening platform of the present application;

[0023] Figure 3 It is a sectional view of the screening platform of the present application;

[0024] Figure 4 It is a bottom view and a perspective view of the outer cylinder of the present application;

[0025] Figure 5 is a bottom view and a perspective view of the inner cylinder of the present application;

[0026] Figure 6 is a bottom view and a perspective view of the sample separation screen of the present application.

[0027] In the drawings: 1, screening platform; 11, flow guide disc; 12, limiting frame; 13, water inlet; 14, flow guide hopper; 15, ore discharge port; 16, drainage area; 17, flushing water hole; 2, fixed support; 3, spring; 4, vibration motor; 5, speed reduction motor; 6, eccentric wheel; 7, sampling water supply system; 71, ore supply pipeline; 72, first flowmeter; 73, first electromagnetic valve; 74, water supply pipeline; 75, second flowmeter; 76, second electromagnetic valve; 8, concentration kettle; 81, outer cylinder; 811, chute; 812, positioning frame; 813, positioning cavity; 82, inner cylinder; 821, sliding block; 822, lever; 83, sample separation screen; 831, screen mesh; 832, cylinder wall; 84, liquid outlet; 85, sector valve plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without any creative work are within the protection scope of the present application.

[0029] In addition, the technical solutions in the various embodiments of the present application can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize the combination, and when the combination of the technical solutions appears to be contradictory or unachievable, it should be considered that the combination of the technical solutions does not exist and is not within the protection scope of the present application.

[0030] As Figures 1 to 6As shown in one ore pulp screening device, including concentration kettle 8 and vibrating screening device, the vibrating screening device includes fixed support 2 and screening platform 1, the screening platform 1 is installed on the fixed support 2 through high-frequency vibration system and low-frequency swing system, the high-frequency vibration system includes a plurality of springs 3 and vibration motor 4, the bottom of the screening platform 1 is fixed on the fixed support 2 through the vertically arranged plurality of springs 3, the plurality of springs 3 are arranged symmetrically with the center axis of the screening platform 1, the vibration end of the vibration motor 4 is installed on the bottom of the screening platform 1, in particular, the bottom of the screening platform 1 and the top of the fixed support 2 are respectively fixed with guide rods at the positions where the springs 3 are installed, the both ends of the spring 3 are sleeved on the guide rods and fixed with the guide rods, the length of the spring 3 is greater than the total length of the two guide rods; the rotating speed of the vibration motor 4 is 1500r / min-3000r / min, the unbalanced mass force generated by the rotation of the vibration motor 4 makes the screening platform 1 produce high-frequency vibration, which can be screened in cooperation with the concentration kettle 8 and the flushing water system;

[0031] The low-frequency swing system includes a reduction motor 5 and an eccentric wheel 6, the reduction motor 5 is fixed on the fixed support 2, the rotating shaft of the reduction motor 5 is vertically arranged, the eccentric wheel 6 is fixed on the rotating shaft, the eccentric distance of the eccentric wheel 6 is about 1cm-2cm; the rotating speed of the reduction motor 5 is 60r / min-90r / min, further, in order to avoid excessive wear of the contact part of the eccentric wheel 6 and the screening platform 1, the roller is installed on the contact part of the screening platform 1 and the eccentric wheel to replace the sliding friction with the rolling friction to reduce the wear;

[0032] The top surface of the screening platform 1 is concave to form a flow guide disc 11, a cavity is arranged in the screening platform 1 below the flow guide disc 11 to form a flow guide hopper 14, the side surface of the screening platform 1 is provided with a ore discharge port 15 which is communicated with the outlet of the flow guide hopper 14, the center of the flow guide disc 11 is provided with a drainage area 16 which is matched with the size of the bottom surface of the concentration kettle 8, the drainage area 16 is full of drainage holes which are communicated with the inlet of the flow guide hopper 14, the limiting frame 12 for limiting the concentration kettle 8 is arranged in the flow guide disc 11 and symmetrically in the periphery of the drainage area 16.

[0033] As shown in the figure, Figure 1 The upper part of the vibrating screening device is further provided with a sampling water supply system 7, the sampling water supply system 7 includes a sampling system for introducing ore pulp and a water supply system for introducing clean water, the outlets of the sampling system and the water supply system are connected with a three-way joint and a total liquid outlet pipe, the total liquid outlet pipe is arranged directly above the drainage area 16, and the outlet of the total liquid outlet pipe faces the opening of the concentration kettle 8.

[0034] The sampling system comprises a feeding pipe 71, a first flow meter 72 and a first electromagnetic valve 73 installed on the feeding pipe 71, and a water supply system comprising a water feeding pipe 74, a second flow meter 75 and a second electromagnetic valve 76 installed on the water feeding pipe 74, the outlets of the water feeding pipe 74 and the feeding pipe 71 being connected with a three-way joint to a main outlet pipe; the first flow meter 72, the first electromagnetic valve 73, the second flow meter 75 and the second electromagnetic valve 76 being connected with a control system;

[0035] When the concentration of the ore pulp needs to be measured, the control system controls the first flow meter 72 and the first electromagnetic valve 73 to input the ore pulp into the concentration kettle 8, and the volume of the ore pulp entering the concentration kettle 8 is obtained through the first flow meter 72; after the sampling of the ore pulp is completed, the control system controls the second flow meter 75 and the second electromagnetic valve 76 to input clean water into the concentration kettle 8, and the volume of the clean water entering the concentration kettle 8 is obtained through the second flow meter 75;

[0036] As shown in Figures 4 to 6 The concentration kettle 8 comprises a sample separation screen 83, an outer cylinder 81 and an inner cylinder 82, which are sequentially sleeved from outside to inside, the outer diameter of the inner cylinder 82 matches the inner diameter of the outer cylinder 81, the inner cylinder 82 is slidingly inserted into the outer cylinder 81 and can rotate in the outer cylinder 81, the sample separation screen 83 is installed in the inner cylinder 82, the sample separation screen 83 comprises a cylindrical wall 832 and a screen 831 installed at the bottom of the wall 832, the outer diameter of the sample separation screen 83 matches the inner diameter of the inner cylinder 82, and a liquid level sensor is arranged on the inner wall of the sample separation screen 83, so that the liquid level in the concentration kettle 8 can be monitored through the liquid level sensor;

[0037] A plurality of center-symmetrically arranged and size-matched fan-shaped through holes are arranged on the bottom plates of the outer cylinder 81 and the inner cylinder 82 to form liquid outlets 84, the portions of the bottom plates of the outer cylinder 81 and the inner cylinder 82 between adjacent fan-shaped through holes constitute fan-shaped valve plates 85, the area of the fan-shaped valve plates 85 is larger than that of the liquid outlets 84, the outer cylinder 81 and the inner cylinder 82 are relatively rotated to form a valve structure, in the open state of the valve, the liquid outlets 84 of the outer cylinder 81 and the inner cylinder 82 overlap; in the closed state of the valve, the liquid outlets 84 of the outer cylinder 81 and the inner cylinder 82 are staggered, so that the fan-shaped valve plates 85 of the inner cylinder 82 seal the liquid outlets 84 of the outer cylinder 81, further, the outer cylinder 81 and the inner cylinder 82 are further provided with limiting structures for facilitating stable rotation of the outer cylinder 81 and the inner cylinder 82;

[0038] The limiting structure comprises two sliding grooves 811 symmetrically mounted on the outer cylinder 81 and arranged in the circumferential direction, and a sliding block 821 fixed outside the inner cylinder 82 and matched with the sliding groove 811, the inner cylinder 82 is slidingly installed in the sliding groove 811 of the outer cylinder 81 through the sliding block 821, one end of the sliding groove 811 is the opening end of the valve, and the other end is the closing end of the valve, when the sliding block 821 slides to the opening end of the sliding groove 811, the outer cylinder 81 overlaps with the liquid outlet 84 of the inner cylinder 82; when the sliding block 821 slides to the closing end of the sliding groove 811, the fan-shaped valve plate 85 of the inner cylinder 82 seals the liquid outlet 84 on the outer cylinder 81; a positioning frame 812 is mounted outside the outer cylinder 81 at the opening end of the sliding groove 811, a positioning cavity 813 matched in size with the sliding block 821 is arranged inside the positioning frame 812, an opening communicating with the positioning cavity 813 is arranged on the side of the positioning frame 812 facing the sliding groove 811, and the sliding block 821 slides into the positioning cavity 813 of the positioning frame 812 in the open state of the valve; a positioning groove matched in size with the positioning frame 812 is arranged in the limiting frame 12 of the flow guide disc 11, the inlet of the positioning groove is arranged at the top of the limiting frame 12, the positioning frame 812 of the concentration kettle 8 is inserted into the positioning groove of the limiting frame 12 after the concentration kettle 8 is placed in the drainage area 16, the concentration kettle 8 is limited, and the concentration kettle 8 is prevented from being separated from the screening platform 1 when vibrating.

[0039] Further, a plurality of washing water holes 17 are uniformly arranged in the flow guide disc 11 around the drainage area 16 and centered on the drainage area 16, a water inlet 13 is arranged on the side surface of the screening platform 1, a water guide channel is arranged in the screening platform 1 to communicate the water inlet 13 with the washing water holes 17; a water pipe is connected with the water inlet 13, a valve of the water pipe is opened, and clean water continuously supplies the flow guide disc 11 through the washing water holes 17 to wash the ore slurry in the concentration kettle 8, so that the ore slurry in the concentration kettle 8 after vibration and screening is more quickly discharged into the flow guide hopper 14 through the drainage area 16 and discharged from the ore discharge port 15.

[0040] In order to facilitate the rotation of the inner cylinder 82, a lever 822 is further fixed outside the inner cylinder 82, the lever 822 is slidingly installed in the sliding groove 811, and the lever 822 extends out of the sliding groove 811, so that the lever 822 does not slide into the positioning frame 812 after the sliding block 821 slides into the positioning cavity 813 of the positioning frame 812, thereby facilitating the rotation of the inner cylinder 82.

[0041] The specific working process is as follows:

[0042] First, the concentration kettle 8 is placed on the drainage area 16 of the vibrating screening device, the valve of the concentration kettle 8 is closed, the sampling system is opened, the ore pulp is sampled through the ore feeding pipeline 71, the sampling process controls the volume of the sampled ore pulp to be less than 1 / 2 of the volume of the concentration kettle 8, then the water supply system is opened, the clean water is added to the concentration kettle 8 through the water feeding pipeline 74, when the liquid level in the concentration kettle 8 reaches the set height, the water feeding pipeline 74 stops feeding water; after the constant volume is completed, the concentration kettle 8 is moved to the weighing device, the weighing device measures the total weight of the concentration kettle 8; after the weighing is completed, the concentration kettle 8 is placed on the flow guide disc 11 of the vibrating screening device, the valve at the bottom of the concentration kettle 8 is opened, so that the sliding block 821 slides into the positioning cavity 813 of the positioning frame 812, the ore pulp in the concentration kettle 8 flows out from the liquid outlet 84 and flows into the flow guide disc 11, then the concentration kettle 8 is inserted and mounted in the positioning groove of the limiting frame 12 through the positioning frame 812, so as to limit the concentration kettle 8 on the screening platform 1; then the vibrating screening device is started to screen, when the vibrating screening device works, the vibration motor and the speed reducer motor realize high-frequency vibration and low-frequency swing of the concentration kettle 8 on the screening platform, at the same time, the clean water continuously supplies the clean water to the flow guide disc 11 through the flushing water hole 17, the clean water makes the ore pulp particles pass through the bottom screen of the concentration kettle 8 from top to bottom, the ore particles with large particle size are retained above the screen, and the ore particles with small particle size enter the flow guide hopper downward and are discharged from the ore discharge port; during the screening, the liquid level height in the flow guide disc 11 can be controlled through the flow of the clean water, and the liquid level height can be monitored through the liquid level sensor in the concentration kettle 8, so as to improve the screening effect, after the vibrating screening device works for about 10 minutes, the vibrating screening device is stopped, and the clean water in the flow guide disc 11 continues to work for about 5 minutes, so as to flush the ore particles in the flow guide hopper clean.

[0043] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A slurry screening device, characterized in that: The device includes a concentration vessel and a vibrating screening device. The vibrating screening device includes a fixed support and a screening platform. The screening platform is mounted on the fixed support via a high-frequency vibration system and a low-frequency oscillation system. The top surface of the screening platform is concave to form a guide plate. A cavity is provided inside the screening platform and below the guide plate to form a guide bucket. A discharge port is provided on the side of the screening platform and communicates with the outlet of the guide bucket. A drainage area matching the size of the bottom surface of the concentration vessel is provided in the center of the guide plate. The drainage area is covered with drainage holes, which communicate with the inlet of the guide bucket. A limiting frame for limiting the concentration vessel is symmetrically provided inside the guide plate and around the drainage area. The concentration vessel includes a sample sieve, an outer cylinder, and an inner cylinder. The outer diameter of the inner cylinder matches the inner diameter of the outer cylinder. The inner cylinder is slidably inserted into the outer cylinder and can rotate within the outer cylinder. The sample sieve is installed inside the inner cylinder, and its outer diameter matches the inner diameter of the inner cylinder. Multiple centrally symmetrically arranged, matching fan-shaped through holes are provided on the bottom plates of the outer and inner cylinders to form liquid outlets. The portion of the bottom plates of the outer and inner cylinders between adjacent fan-shaped through holes constitutes a fan-shaped valve plate. The area of ​​the fan-shaped valve plate is larger than the area of ​​the liquid outlet. The outer and inner cylinders rotate relative to each other to form a valve structure. When the valve is open, the liquid outlets of the outer and inner cylinders overlap. When the valve is closed, the liquid outlets of the outer and inner cylinders are staggered, allowing the fan-shaped valve plate of the inner cylinder to seal the liquid outlet on the outer cylinder. Limiting structures are also provided on the outer and inner cylinders to facilitate stable rotation of both. The limiting structure includes two symmetrically installed grooves on the outer cylinder, arranged circumferentially, and a slider fixed to the outside of the inner cylinder, matching the grooves. The inner cylinder is slidably installed in the grooves of the outer cylinder via the slider. One end of the groove is the opening end of the valve, and the other end is the closing end of the valve. When the slider slides to the opening end of the groove, the liquid outlets of the outer cylinder and the inner cylinder overlap. When the slider slides to the closing end of the groove, the fan-shaped valve plate of the inner cylinder seals the liquid outlet on the outer cylinder. A positioning frame corresponding to the limiting frame is installed on the outside of the outer cylinder, outside the opening end of the groove. The positioning frame has a positioning cavity matching the size of the slider inside. The side of the positioning frame facing the groove has an opening communicating with the positioning cavity. When the valve is open, the slider slides into the positioning cavity of the positioning frame.

2. The slurry screening equipment according to claim 1, characterized in that: The high-frequency vibration system includes multiple springs and a vibration motor. The bottom of the screening platform is fixed to a fixed support by multiple vertically arranged springs. The multiple springs are symmetrically arranged around the central axis of the screening platform. The vibration end of the vibration motor is installed at the bottom of the screening platform. The low-frequency oscillation system includes a geared motor and an eccentric wheel. The geared motor is fixed to a fixed support. The rotation shaft of the geared motor is arranged vertically, and the eccentric wheel is fixed on the rotation shaft.

3. The slurry screening equipment according to claim 2, characterized in that: Guide rods are fixed to the bottom of the screening platform and the top of the fixed support, respectively, at the position where the spring is installed. The two ends of the spring are fitted onto the guide rods and fixed to the guide rods. The length of the spring is greater than the total length of the two guide rods.

4. A slurry screening device according to any one of claims 1 to 3, characterized in that: The limiting frame of the flow guide plate is provided with a positioning groove that matches the size of the positioning frame. The inlet of the positioning groove is located at the top of the limiting frame. After the concentration pot is placed in the drainage area, the positioning frame of the concentration pot is inserted into the positioning groove of the limiting frame to limit the position of the concentration pot.

5. A slurry screening device according to claim 4, characterized in that: Multiple flushing water holes are evenly distributed inside the guide plate, around the drainage area, and centered on the drainage area. A water inlet is provided on the side of the screening platform, and a water guiding channel is provided inside the screening platform to connect the water inlet and the flushing water holes.

6. A slurry screening device according to claim 5, characterized in that: A lever is also fixed to the outside of the inner cylinder. The lever is slidably installed in the slide groove and extends out of the slide groove. When the slider slides into the positioning cavity of the positioning frame, the lever will not slide into the positioning frame.

7. The slurry screening equipment according to claim 1, characterized in that: A sampling and water supply system is also installed above the vibrating screening device. The sampling and water supply system includes a sampling system for introducing slurry and a water supply system for introducing clean water. The outlets of the sampling system and the water supply system are connected to the main outlet pipe through a tee. The main outlet pipe is located directly above the drainage area, and the outlet of the main outlet pipe faces the opening of the concentration vessel.

8. A slurry screening device according to claim 7, characterized in that: The sampling system includes a feed pipeline and a first flow meter and a first solenoid valve installed on the feed pipeline. The water supply system includes a water supply pipeline and a second flow meter and a second solenoid valve installed on the water supply pipeline. The outlets of the water supply pipeline and the feed pipeline are connected to the main outlet pipeline through a tee. The first flow meter, the first solenoid valve, the second flow meter, and the second solenoid valve are connected to the control system.

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