CN114453235B - Arm type automatic screening equipment and method for screening ore pulp granularity of mineral concentration plant by using same - Google Patents

Arm type automatic screening equipment and method for screening ore pulp granularity of mineral concentration plant by using same Download PDF

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Publication number
CN114453235B
CN114453235B CN202111568606.1A CN202111568606A CN114453235B CN 114453235 B CN114453235 B CN 114453235B CN 202111568606 A CN202111568606 A CN 202111568606A CN 114453235 B CN114453235 B CN 114453235B
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screening
screen
ore pulp
swinging
type automatic
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CN114453235A (en
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孙伟
肖遥
杨越
韩海生
彭建
王丽
唐鸿鹄
刘润清
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Central South University
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Central South University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/55—Cleaning with fluid jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Combined Means For Separation Of Solids (AREA)

Abstract

The invention discloses arm type automatic screening equipment and a method for screening ore pulp granularity of a mineral concentration plant, wherein the device comprises a swinging system, a screening box and a screening flushing water system; the swing system main body comprises a reciprocating motion part consisting of an eccentric wheel and a push rod mechanism and a swing part taking a rubber spring as a connecting piece. The swinging part consists of a fixed frame, a movable frame and a rubber spring, wherein the fixed frame is connected with the movable frame through the rubber spring, and unbalanced mass force generated by the rotation of the eccentric wheel along with the motor enables the movable frame to swing and screen by matching with the screening washing water. After screening, the sleeve screen is integrally rotated by an angle through the stepping motor, so that the flushing water is convenient to take away the ore pulp, and the ore pulp is discharged from the ore discharge port. The device can simulate screening operation in an actual concentrating mill, replace repeated mechanical operation of workers, and realize automatic screening of ore pulp; the method for screening ore pulp by using the device has the advantages of simple process and convenient operation, and meets the requirement of industrial production.

Description

Arm type automatic screening equipment and method for screening ore pulp granularity of mineral concentration plant by using same
Technical Field
The invention relates to an arm type automatic screening device, in particular to an arm type automatic screening device and a method for screening ore pulp granularity of a mineral processing plant, and belongs to the technical field of mineral processing.
Background
Flotation technology has been developed over one hundred years since the end of the 19 th century, technology has been developed and perfected, and flotation has become the most dominant means of beneficiation. The particle size of minerals is one of the key factors affecting mineral flotation. Research shows that the optimal particle size range of the froth flotation is between 5 and 75 mu m. The upper limit of the floatation granularity of the high-density minerals is 0.1-0.3 mm; the density of the low-density minerals is correspondingly 0.3-0.5 mm. The flotation recovery of minerals is not favored by either too fine or too coarse a particle size of the minerals. The research result of Trhar shows that: the flotation granularity limit of the minerals such as cassiterite, wolframite, barite, fluorite, quartz and the like is respectively 3-20 mu m, 20-50 mu m, 10-30 mu m, 10-90 mu m and 9-50 mu m. When the particle size exceeds the optimal particle size range, the flotation index of both sulphide ores and oxide ores is significantly deteriorated. A large number of research results show that different particle sizes have different flotation rates, and the particle sizes outside the optimal flotation particle size range obviously reduce the flotation rate coefficient (numerical value). Therefore, the granularity composition information of the selected minerals has important influence on the index of the subsequent flotation, so that the information of the current ore pulp granularity composition of the concentrating mill can be reflected in real time, and the method is particularly important.
Currently, there are various particle size measurement methods, such as sieving, sedimentation, microscopy, malvern laser particle size measurement, coulter full-automatic particle size analysis, particle counter analysis, electric induction method, etc. In scientific research, a screening method and a Markov laser particle size measurement method are two commonly used particle size measurement methods, wherein the screening method is the most general and visual method in particle size measurement, and has the advantages of simple and visual principle, convenient operation and easy implementation, and is an important reason for wide application.
Rocking screens are a special form of screening machinery in a wide variety of configurations, and their unique variety of adaptations have led to their widespread use in many industries.
The rocking screen is named as a rocking movement mode of a circular screen surface, and the driving mode is a forced driving mode of mechanical eccentricity and deflection angle. The whole cylinder type screen box is driven by a swinging shaft which moves in space to do swinging motion, and belongs to a mechanical swinging motion screen. The basic structure of the rocking screen was developed in 1999, g.kainz, germany, as the inventor, issued european patent. Kainz is also a sponsor of German GKM screening technology Co., ltd. In 1995. The rocking screen has been developed rapidly, and various technologies are known in the art to obtain European or German patent authorization, such as a pneumatic-hydraulic lifting device for replacing the screen and a certain grain yield detection system of the screening machine, which are invented by Allgaier screening technology Co., ltd. In Germany, a cylinder type screen box tensioning device of Minox screening technology Co., ltd. In Germany, and the like. The swinging sieve realizes the principle of imitating manual sieving through a special mechanical structure design, combines two forms of horizontal swinging and vertical upward throwing dustpan movement in manual sieving action, and increases tangential throwing dustpan movement. The three movement forms are adjusted and combined favorably, so that the spiral outward three-dimensional space complex movement of the materials on the screen surface can be realized, the whole circular screen surface is effectively utilized, and the screening efficiency is improved; effectively solves the problem of difficult sieving and sieving of fine-fraction materials by dry and wet sieving. The preset various movement modes can be realized through reasonable adjustment of the eccentricity, the radial deflection angle and the tangential deflection angle, and the device is suitable for effectively screening different materials in a plurality of industries; the method can be used as inspection screening and grading screening of a process system; the granular or powdery material can be sieved, and the finest can reach the micron level. The multilayer drum type screen box design can improve the yield and increase the product quantity of different grain grades. The gentle screening can be realized by reasonably adjusting the swing parameters of the screening machine, and the screening machine is particularly suitable for the protective screening of individual special agglomerated materials.
The structural characteristics of the swinging sieve enable the swinging sieve to be easily enlarged, and the diameter of the largest swinging sieve in the world at present reaches 2.9m; the control of the swinging sieve is relatively easy, and the eccentric amount, the radial inclination angle and the tangential inclination angle of the swinging sieve are easy to adjust, so that the preset movement track of the oversize material is realized, and the ideal sieving efficiency and yield are achieved; the biggest advantage of the swinging sieve is also reflected in deep sieving, the swinging sieve can be used for deep sieving of different materials by virtue of slow rotation and various screen mesh cleaning devices, the sieving particle size can reach 0.1mm, and the sieving efficiency can reach 99%; the rocking screen has less dynamic load and vibration noise and is less limited in installation and placement. Since the invention and formation of shaped products, the rocking screen has been widely used in many industries such as mining, food chemical industry, casting, abrasive grinding, building materials, medicine, light industry, wood paper making, sugar making, salt making, grain processing, and fertilizer. The swinging sieve is mainly used for dry sieving various granular and powdery materials. The screening machine and the system can also be subjected to wet screening after being specially designed according to specific material characteristics, and the screening classification particle size can be from tens of millimeters to micrometers. Rocking screens are used for dry classification screening of many minerals such as bauxite, limestone, kaolin, diatomaceous earth and the like. The yield of limestone powder treated by TSM2600 type swinging sieve is 25t/h, the grading particle size of the bottom layer sieve is 0.25mm, the size of the bottom layer sieve is 5 layers of sieves, and the sieving efficiency of 6 products can reach 95%.
Disclosure of Invention
Aiming at the defects of low efficiency, insufficient deep screening and the like in the existing vibration screening technology, the invention aims to provide the arm type automatic screening equipment which can realize the automatic screening of mineral samples of a mineral concentration plant efficiently and reliably with low cost.
The invention further aims to provide the application of the arm type automatic screening device in the sampling and screening method in the concentrating mill, which can realize the arm type automatic screening of the mineral sample of the concentrating mill with high efficiency, reliability and low cost, has simple process and convenient operation, and meets the requirement of industrial production.
In order to achieve the technical purpose, the invention designs an arm type automatic screening device, which comprises:
comprises a swinging system, a screen sleeving box and a screen sleeving flushing water system;
the swinging system main body is a reciprocating motion part consisting of an eccentric wheel and a push rod mechanism and a swinging part taking a rubber spring as a connecting piece;
the reciprocating motion part is realized in a mode that the motor drives the eccentric wheel and the eccentric wheel to be in high-pair contact with the push rod, and the reset of the push rod is realized by adopting a spring and sliding block mechanism; the swinging part consists of a fixed frame, a movable frame and a rubber spring, and the fixed frame is connected with the movable frame through the rubber spring;
the screening box is connected with the mechanical arm through a rotating shaft of a stepping motor, and the stepping motor is fixedly connected to the mechanical arm; the mechanical arm is fixedly connected with the sliding block, the sliding block is connected with the push rod in a high pair, the sliding block can horizontally move on the guide rail, the sliding block is connected with one end of the spring, the other side of the spring is connected with the fixed end, and the screening box is arranged in a suspended mode; the side surface of the sleeve screen box is provided with an ore discharge port;
the screening flushing water system can integrally rotate the screening through the stepping motor by an angle after screening is finished, so that flushing water is convenient to take away ore pulp, and the ore pulp is discharged from an ore discharge port.
The invention relates to arm type automatic screening equipment; the eccentricity of the eccentric wheel is 5 cm-10 cm.
The invention relates to arm type automatic screening equipment; the contact part of the push rod and the eccentric wheel is additionally provided with a roller.
The invention relates to arm type automatic screening equipment; the push rod and the center of motion of the eccentric wheel are on the same horizontal line.
The invention relates to arm type automatic screening equipment; the upper part of the sleeve screen box is opened, and the bottom of the sleeve screen box is closed; the screens with different apertures in the screen box are arranged in parallel at equal intervals.
The invention relates to arm type automatic screening equipment; the lower part of the screen cloth in the screen box is communicated with the ore discharge port; only one layer of screen cloth is arranged between two adjacent ore discharge openings.
The invention relates to arm type automatic screening equipment; the ore discharge port is obliquely upwards designed and forms an included angle of 30 degrees with the horizontal direction.
The invention relates to arm type automatic screening equipment; the rotation angle of each action of the stepping motor is 45 degrees, and the stepping motor waits for 3 minutes to perform counter-clockwise rotation homing after rotating clockwise.
The invention relates to a method for screening ore pulp in a mineral processing plant by an arm type automatic screening device, which comprises the steps of enabling ore pulp to enter a screening box from a pulp inlet of a screening washing water system, starting a motor of a swinging system to enable the swinging system to swing in an unbalanced mode, and starting washing water to enable ore pulp particles to pass through a plurality of layers of screening from top to bottom, wherein the ore particles with different particle sizes are reserved on screens with different layers; and stopping the movement of the swinging system after the swinging process lasts for 8-15 minutes, and simultaneously, rotating the screen box clockwise by 45 degrees by a stepping motor in the screen sleeving flushing water system, and flushing mineral particles on different layers of screens to a mineral discharge port by matching flushing water.
The invention discloses a method for screening ore pulp in a concentrating mill by using arm type automatic screening equipment, wherein the rotating speed of a motor of a swinging part is 300-500 r/min.
The invention discloses a method for screening ore slurry in a concentrating mill by using arm type automatic screening equipment, wherein an ore discharge port is connected with a hose.
The design principle is based on: the main principle of swing screening in the invention is that the reciprocating motion formed by the eccentric wheel and the push rod mechanism is matched with the rubber spring to realize irregular swing, wherein, due to the horizontal arrangement of the push rod, the reset of the push rod adopts the combination of a sliding block, a guide rail and the spring, and simultaneously, in order to avoid excessive abrasion of the contact part of the eccentric wheel and the push rod, the contact part of the push rod and the eccentric wheel is additionally provided with a roller, and the rolling friction is used for replacing the sliding friction to reduce the abrasion; the screening flushing part adopts a stepping motor to automatically adjust the angle, so that the screen mesh can conveniently play a role in guiding flow after screening and cooperate with flushing water to flush mineral particles to a mineral discharge port.
According to the technical scheme, the ore pulp screening is not only suitable for concentrating mills, but also liquid containing suspended solid particles can be screened by adopting the arm type automatic screening equipment.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. the arm-type automatic screening equipment provided by the invention adopts a shaking screening principle different from vibration screening, can deeply screen particles in ore pulp, is more accurate than the traditional vibration screening, and provides more accurate feeding granularity information for flotation in a subsequent concentrating mill. The eccentric wheel in the device rotates the unbalanced mass force that produces along with the motor and makes movable frame swing, cooperation spring 8, slider 9, guide rail 10, push rod 11 and arm 14 reach the mesh of multidimension degree vibrations, and this multidimension vibrations pass through arm 14 and transmit for the screen jacket, realize the multidimension vibrations of screen jacket, cooperate the screen jacket wash water simultaneously and carry out degree of depth screening, can simulate the screening operation in the actual concentrating mill, replace workman's repeated mechanical operation, can realize the automatic screening of ore pulp. The screen washing water system can integrally rotate the screen through the stepping motor by an angle after screening is finished, so that washing water is convenient to take away ore pulp, and the ore pulp is discharged from an ore discharge port. The problems of high labor intensity, long repeated mechanical operation time and the like of manual sampling screening in the existing concentrating mill are solved, and automatic screening of the ore pulp depth is realized.
2. The arm type automatic screening equipment disclosed by the invention can realize automatic screening without manual operation in the sampling screening process and with a simple control system such as a PLC (programmable logic controller), is simple in process and convenient to operate, and meets the requirement of industrial production.
Drawings
FIG. 1 is a schematic cross-sectional view of an arm-type automatic screening apparatus of the present invention;
wherein 1 is a dust cover, 2 is an eccentric wheel, 3 is a reverser, 4 is a movable frame, 5 is a rubber spring, 6 is a motor, 7 is a fixed frame, 8 is a spring, 9 is a slide block, 10 is a guide rail, 11 is a push rod, 12 is flushing water, 13 is a slurry inlet, 14 is a mechanical arm, 15 is a stepping motor, 16 is a screen box, and 17 is a ore discharge port
Detailed Description
The following examples are intended to further illustrate the present invention and are not intended to limit the scope of the claims.
The arm-type automatic screening apparatus referred to in the following examples is shown in fig. 1. The main body of the high-flux magnetic solid-liquid separation device comprises an excitation system and a centrifugal separation system. The device comprises a swinging system and a screening flushing water system, wherein the main body of the swinging system comprises a reciprocating motion part consisting of an eccentric wheel 2, a push rod 11, a guide rail 10, a spring 8 and a sliding block 9 and a swinging part taking a rubber spring 5 as a connecting piece; the swinging part consists of a fixed frame 7, a movable frame 4 and a rubber spring 5, wherein the fixed frame 7 is connected with the movable frame 4 through the rubber spring 5, the whole swinging part is powered by a motor 6, the motor 6 drives an eccentric wheel 2 to drive the eccentric wheel 2 to drive a push rod 11 to move, the push rod 11, a mechanical arm 14 and a sliding block 9 are fixedly connected, the push rod 11 and the mechanical arm 14 can horizontally move through a sliding pair of the sliding block 9 and a guide rail 10, and a spring 8 can reset the push rod, the sliding block and the mechanical arm system; the main body of the screening flushing water system comprises flushing water 12, a screening box 16 and a mineral discharge port 17, deflection of the screening flushing water system is realized by a stepping motor 15, the screening box 16 is connected with a mechanical arm 14 through a rotating shaft of the stepping motor, and the stepping motor 15 is fixedly connected to the mechanical arm. The screening box is in a suspended state.
The arm type automatic screening device is used for the process of screening ore pulp in a concentrating mill: enabling ore pulp to enter a screen box from a pulp inlet of a screen washing water system, starting a motor of a swinging system to enable the swinging system to swing in an unbalanced mode, and simultaneously starting washing water to enable ore pulp particles to pass through a plurality of layers of screen jackets from top to bottom, wherein mineral particles with different particle sizes are reserved on screens of different layers; after the swing process lasts about 10 minutes, the movement of the swing system is stopped, meanwhile, a stepping motor in the screening washing water system rotates the screening box clockwise by 45 degrees, mineral particles on different layers of screens are washed to a mineral discharge port by matching with washing water, and the deep screening of ore pulp particles is realized.
Example 1
The arm type automatic screening equipment and the method for treating ore pulp of a mineral processing plant are utilized to treat ore pulp of a mine in Hunan Chengzhou, a pulp inlet, flushing water and a swing system are opened, the swing process lasts for 15 minutes, the ore pulp is discharged and collected after the swing is stopped, each particle grade is dried and weighed to obtain 417.5g of-800 meshes, +800 meshes to 51.2g of-400 meshes, +400 meshes to 33.9g of-200 meshes, +200 meshes 225.7g, each particle grade accounts for 57.3 percent of-800 meshes, 7.03 percent of +800 meshes to-400 meshes, +400 meshes to 4.65 percent of-200 meshes and 30.9 percent of +200 meshes. The manual screening of the field workers has the proportion of 53.9 percent of each size fraction of minus 800 meshes, 7.87 percent of plus 800 meshes to minus 400 meshes, 5.23 percent of plus 400 meshes to minus 200 meshes and 33 percent of plus 200 meshes, and the overall screening effect is close.

Claims (8)

1. An arm-type automatic screening equipment, its characterized in that:
comprises a swinging system, a screen sleeving box and a screen sleeving flushing water system;
the swinging system main body is a reciprocating motion part consisting of an eccentric wheel and a push rod mechanism and a swinging part taking a rubber spring as a connecting piece;
the reciprocating motion part is realized in a mode that the motor drives the eccentric wheel and the eccentric wheel to be in high-pair contact with the push rod, and the reset of the push rod is realized by adopting a spring and sliding block mechanism; the swinging part consists of a fixed frame, a movable frame and a rubber spring, and the fixed frame is connected with the movable frame through the rubber spring;
the screening box is connected with the mechanical arm through a rotating shaft of a stepping motor, and the stepping motor is fixedly connected to the mechanical arm; the mechanical arm is fixedly connected with the sliding block, the sliding block is connected with the push rod in a high pair, the sliding block can horizontally move on the guide rail, the sliding block is connected with one side of the spring, the other side of the spring is connected with the fixed end, and the screen box is arranged in a suspended mode; the side surface of the sleeve screen box is provided with an ore discharge port;
the screening washing water system can integrally rotate the screening through the stepping motor by an angle after screening is finished, so that washing water is convenient to take away ore pulp, and the ore pulp is discharged from an ore discharge port; the upper part of the sleeve screen box is opened, and the bottom of the sleeve screen box is closed; the sieves with different apertures in the sleeve sieve box are equidistantly and parallelly arranged;
the ore discharge port is obliquely upwards designed and forms an included angle of 30 degrees with the horizontal direction.
2. The wobble system as in claim 1, wherein: the eccentricity of the eccentric wheel is 5 cm-10 cm.
3. An arm-type automatic screening apparatus according to claim 1 or 2, characterized in that: the push rod and the center of motion of the eccentric wheel are on the same horizontal line.
4. An arm-type automatic screening apparatus according to claim 1, wherein: the lower part of the screen cloth in the screen box is communicated with the ore discharge port; only one layer of screen cloth is arranged between two adjacent ore discharge openings.
5. An arm-type automatic screening apparatus according to claim 1, wherein: the rotation angle of each action of the stepping motor is 45 degrees, and the stepping motor waits for 3 minutes to perform counter-clockwise rotation homing after rotating clockwise.
6. The method for using the arm-type automatic screening equipment for screening ore slurry in a concentrating mill according to any one of claims 1 to 5, which is characterized in that: enabling ore pulp to enter a screen box from a pulp inlet of a screen washing water system, starting a motor of a swinging system to enable the swinging system to swing in an unbalanced mode, and simultaneously starting washing water to enable ore pulp particles to pass through a plurality of layers of screen jackets from top to bottom, wherein mineral particles with different particle sizes are reserved on screens of different layers; and stopping the movement of the swinging system after the swinging process lasts for 8-15 minutes, and simultaneously, rotating the screen box clockwise by 45 degrees by a stepping motor in the screen sleeving flushing water system, and flushing mineral particles on different layers of screens to a mineral discharge port by matching flushing water.
7. The use of an arm-type automatic screening apparatus according to claim 6, wherein: the motor rotating speed of the swing system is 300 r/min-500 r/min.
8. The use of an arm-type automatic screening apparatus according to claim 6, wherein: the ore discharge port is connected with a hose.
CN202111568606.1A 2021-12-21 2021-12-21 Arm type automatic screening equipment and method for screening ore pulp granularity of mineral concentration plant by using same Active CN114453235B (en)

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CN203140287U (en) * 2013-01-28 2013-08-21 新疆疆宁轻工机械工程技术有限责任公司 Swing-sieve classification device
CN204134891U (en) * 2014-10-09 2015-02-04 三峡大学 A kind of Supplying Sieving Mechanism
CN104888941B (en) * 2015-06-26 2018-04-27 中国地质大学（武汉） A kind of water-jet multi-stage oscillating screen screening device
US9694391B1 (en) * 2016-05-03 2017-07-04 M-I L.L.C. Adjustable split weight gyratory sifter
CN214638051U (en) * 2020-12-30 2021-11-09 唐山市宏恩科技有限公司 Numerical control fine screen composite screening multilayer screen

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