Wet screening instrument
By using centrifugal screening barrel and rotating mechanism in the wet screening instrument and backwashing with rotating centrifugal force, the problem of clogging of the bottom screen of the traditional wet screening instrument is solved, and efficient and precise screening and dehydration functions are achieved, with a compact structure and shortened experimental time.
Patent Information
- Application Number
- CN202422336674.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-09-25
AI Technical Summary
When screening multi-layer screens, the bottom screen has poor flushing effect and is prone to blockage, resulting in long experimental process, high noise, low efficiency, and large area, which cannot meet the requirements of efficient and high-quality experiments.
Using a centrifugal screening barrel and a rotating mechanism, the screen assembly consists of several nested screen members, the screen hole diameter gradually decreases, the flushing assembly is located on the outside, and backflush is achieved by rotating centrifugal force. The screen assembly is fixed in the middle, and the screening is driven by centrifugal force, with a compact structure and high screening efficiency.
It improves screening accuracy and efficiency, shortens experimental time, reduces water consumption and experimental errors, is compact in structure, is easy to use, and has centrifugal dehydration function.
Smart Images
Figure CN223276642U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of screening, in particular to a wet screening instrument. Background Art
[0002] Particle size distribution is an important indicator of the fineness and classification of particulate matter. For the particle size distribution test of materials, the most common and accurate method is wet screening. In traditional wet screening instruments, the experimental mesh surface of the screen assembly is set at the bottom, and the side walls are stainless steel surfaces. The screening of particulate matter is achieved by vibration drive and the introduction of flushing water from the top. In this way, the hydraulic efficiency of the flushing water is mainly concentrated on the top layer of screen. When the number of sieves used is greater than 3, the flushing water has almost no hydraulic flushing effect on the particulate matter on the surface of the bottom screen; and the aperture of the bottom screen is small, which can easily cause the screen to be clogged. Especially when the particulate matter is highly viscous and there is a lot of material stacked on the screen surface, the ultrafine material and flushing water can hardly pass through the bottom fine screen, making the experiment impossible.
[0003] To address this issue, a common approach is to perform layered flushing, first flushing the top 1-2 layers of screen, then removing them and continuing to flush the bottom screens one by one; or reducing the amount of material being measured and increasing the vibration driving force to prevent excessive accumulation of material on the screen surface. However, this often lengthens the experimental process, increases experimental errors, and results in high experimental noise, which cannot meet the requirements of efficient, high-quality experimental measurements in actual production processes. In addition, traditional wet sieving instruments sometimes require larger diameter screens due to screening efficiency considerations, resulting in large space requirements and low efficiency. Utility Model Content
[0004] In response to the above technical problems, the utility model discloses a wet sieving instrument, which effectively improves the experimental accuracy and efficiency, and has a compact structure and is more convenient to use.
[0005] To this end, the technical solution of the present utility model is:
[0006] A wet screening instrument comprises a centrifugal screening barrel and a rotating mechanism, the centrifugal screening barrel comprises a barrel body, a screen assembly and a flushing assembly connected to a flushing water pipeline are provided in the barrel body, the screen assembly comprises a plurality of nested screen members, the bottom of the screen member is a non-porous contact surface, and the side wall of the screen member is provided with a plurality of screen holes; from the middle of the screen assembly to the outside, the screen aperture of the screen member decreases successively; an annular channel for receiving accumulated material on the screen is formed between adjacent screen members; the flushing assembly is located on the outside of each screen member, and the water spray port of the flushing assembly faces the outer side wall of the screen member; the rotating mechanism is connected to the screen assembly to drive the screen assembly to rotate; the rotating mechanism is fixedly connected to the middle of the screen assembly through a fixing assembly to prevent the screen assembly from shifting during rotation, with a compact structure and reliable fixation; a drain outlet is provided at the bottom of the barrel body, and the separated liquid can be discharged from the drain outlet.
[0007] During use, the material to be screened is added to the middle of the screen assembly, the rotating mechanism is started, and the screen assembly is rotated by the rotating mechanism. Water is introduced through the flushing water pipeline, and the water outlet of the flushing assembly is directed toward the outer wall of the screen component. That is, the water outlet direction is opposite to the direction of the rotating centrifugal force, that is, the direction of material movement, forming a backwash, so that the material accumulated on the surface of the screen component is fluidized, the accumulated material on the screen surface is redispersed, and the material stuck in the gaps between the screens is flushed away. Moreover, the flushing assembly is arranged in an annular channel and is stationary. Due to the rotation of the screen assembly in the barrel, the flushing water can evenly cover the entire screen surface, thereby improving the screening efficiency and screening effect, being more conducive to screening, and reducing the flushing water consumption. In this technical solution, the coarse screen is in the middle and the fine screen is on the outside. The inner diameter of the screen gradually increases, that is, its surface area also increases linearly and stepwise, reducing the material load on the screen. Moreover, the larger the inner diameter of the screen component, the greater the centrifugal force on the particles on the surface of the screen component, which better helps sticky small particles and flushing water to pass through the fine screen. Furthermore, centrifugal force is used as the primary driving force for screening, which is far greater than the vibration driving force of traditional screening. After wet screening is completed, the flushing water line is closed, and the sieving machine can also centrifugally dehydrate the material, effectively shortening the subsequent drying time. Compared with traditional wet screening machines, this solution can shorten the experimental process by about half.
[0008] As a further improvement of the present invention, the rotating mechanism includes a driving mechanism, a rotating shaft and a turntable. The turntable is located in the barrel body. The driving mechanism is connected to one end of the rotating shaft, the other end of the rotating shaft is connected to the turntable, and the turntable is connected to the screen assembly to drive the screen assembly to rotate.
[0009] As a further improvement of the present invention, a hollow shaft is erected in the middle of the screen assembly, and the hollow shaft is fixedly connected to the bottom of the screen assembly and passes through the bottom of the screen assembly. The hollow shafts of several screen assemblies are stacked in sequence, and the rotating shaft extends into the stacked hollow shafts and is fixedly connected to the hollow shafts through a fixing assembly. With this technical solution, a hollow shaft is provided in the bottom of each screen assembly, and the inner diameter of the hollow shaft increases in sequence from the outside to the inside of the screen assembly, that is, the inner diameter of the hollow shaft of the outer screen assembly is small, and the inner diameter of the hollow shaft of the inner screen assembly is large. They are stacked together, easy to assemble, and can be fixed together.
[0010] As a further improvement of the present invention, the fixing assembly includes a pin, and the hollow shaft and the rotating shaft are provided with through holes in the radial direction. The hollow shaft and the rotating shaft are connected by inserting the pins into the through holes, that is, the through holes of the hollow shafts and the rotating shafts of each screen assembly are aligned, and the pins are inserted into the through holes to realize the connection between the hollow shaft and the rotating shaft, thereby realizing the fixation of the screen on the rotating shaft.
[0011] As a further improvement of the present invention, the connection between the pin and the hollow shaft is fixed by a bolt.
[0012] As a further improvement of the present invention, a sealing ring is provided at the connection between the barrel body and the rotating shaft to prevent water leakage.
[0013] As a further improvement of the present invention, the top of the screen member is provided with a hanging lug. Furthermore, the number of the hanging lugs is two or more.
[0014] As a further improvement of the present invention, the ratio of the height to the inner diameter of the screen member Hn / Dn≥1; further, the ratio of the gap between adjacent screen members to the inner diameter of the screen member with the larger aperture satisfies bn / Dn=0.1-0.5.
[0015] As a further improvement of the present invention, the flushing assembly includes a vertical flushing water branch pipe, and the flushing water branch pipe is provided with a plurality of flushing nozzles. The flushing nozzle located at the uppermost end of the flushing water branch pipe is obliquely downward toward the outer side of the screen member, and the flushing nozzle located at the lowermost end of the flushing water branch pipe is obliquely upward toward the outer side of the screen member. Furthermore, the flushing nozzle located in the middle of the flushing water branch pipe is horizontally directed toward the outer side of the screen member.
[0016] With this technical solution, the rotation of the screen assembly drives the material inside it to perform centrifugal motion. The particulate matter is not evenly distributed on the screen, but is mainly concentrated on the lower part of the outer edge. At this time, the upward-slanting nozzles on the lower layer can flush the material to the upper part and disperse it for a second time, which is conducive to the grading and screening of the material; at the same time, the downward-slanting water spray from the nozzles on the top layer can flush the fine material back to the middle position for fluidization, preventing it from being thrown out from the top during centrifugal motion.
[0017] As a further improvement of the present invention, the angle between the flushing nozzle located at the uppermost end of the flushing water branch pipe, the flushing nozzle located at the lowermost end of the flushing water branch pipe and the flushing water branch pipe is 30°-90°.
[0018] As a further improvement of the present invention, a control valve is provided on the flushing water pipeline, and a flushing branch pipe control valve is provided on the flushing water branch pipe; the drain outlet is connected to a drain pipe, and the drain pipe is provided with a drain valve.
[0019] Compared with the prior art, the beneficial effects of the present invention are:
[0020] According to the technical solution of the utility model, the screening component is set in the barrel body, the screen is set on the side wall, and the screening component is driven to rotate and the centrifugal force is used to separate and grade the materials. Compared with the traditional test sieve in which the mesh surface is set at the bottom and stacked up and down, the screening device with the same bottom area has a larger screening specific surface area, can screen more experimental materials, and the unit area load of the material passing through the screen surface is lower, which improves the experimental accuracy and efficiency; and the structure is more compact, lighter and more practical; the hydraulic efficiency is high, the cleaning water consumption is small, and the experimental waste liquid is small. The volume is further reduced by fixing the component in the middle of the screen component. Moreover, one device has dual functions, which can perform both screening and centrifugal dehydration. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of a wet sieving instrument according to Example 1 of the present utility model.
[0022] Figure 2 This is a schematic diagram of the flushing water distribution and material flow of a wet screening instrument in Example 1 of the present utility model.
[0023] Figure 3 It is a structural schematic diagram of the screen component of Example 1 of the present invention.
[0024] Figure 4 It is a structural schematic diagram of the fixing assembly of Example 1 of the present utility model.
[0025] Figure 5 This is a schematic diagram of the distribution of nozzles on the flushing water branch pipe of Example 1 of the present utility model.
[0026] Reference numerals include:
[0027] 1- centrifugal screening barrel, 2- screen assembly, 3- rotating mechanism, 4- fixed assembly, 5- flushing assembly, 6- drainage pipe;
[0028] 11-barrel body, 12-sealing ring, 13-drain port;
[0029] 21-screen member, 22-annular channel, 23-hanging ear, 24-hollow shaft;
[0030] 31-driving mechanism, 32-rotating shaft, 33-rotating disk;
[0031] 41-pin, 42-bolt;
[0032] 51-flushing water branch pipe, 52-flushing nozzle, 53-flushing branch pipe control valve, 54-flushing water inlet pipe, 55-main control valve;
[0033] 61-drain pipe, 62-drain valve. DETAILED DESCRIPTION
[0034] The preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
[0035] Example 1
[0036] like Figures 1 to 5 As shown, a wet screening instrument includes a centrifugal screening barrel 1 and a rotating mechanism 3, wherein the centrifugal screening barrel 1 includes a barrel body 11, wherein a screen assembly 2 and a flushing assembly 5 connected to a flushing water pipeline are provided in the barrel body 11, wherein the screen assembly 2 includes a plurality of nested screen members 21, wherein the bottom of the screen member 21 is a non-porous contact surface, and the side wall of the screen member 21 is provided with a plurality of screen holes; from the middle of the screen assembly 2 to the outside, the screen aperture of the screen member 21 decreases successively, that is, the screen aperture of the middle screen member 21 is large, and the further outward, the smaller the screen aperture of the screen member 21. The screen members 21 are stacked at the bottom. An annular channel 22 for receiving the accumulated material on the screen is formed between adjacent screen members 21. The flushing assembly 5 is located on the outside of each screen component 21, and the water spray port of the flushing assembly 5 is facing the outer wall of the screen component 21; the rotating mechanism 3 is connected to the screen assembly 2 to drive the screen assembly 2 to rotate; a drain port 13 is provided at the bottom of the barrel body 11, and the separated liquid can be discharged from the drain port 13.
[0037] The rotating mechanism 3 includes a driving mechanism 31, a rotating shaft 32, and a rotating disk 33. The driving mechanism 31 provides a centrifugal driving force for rotation. The rotating disk 33 is located in the barrel 11. The driving mechanism 31 is connected to one end of the rotating shaft 32, and the other end of the rotating shaft 32 is connected to the rotating disk 33. The rotating disk 33 is connected to the screen assembly 2 to drive the screen assembly 2 to rotate. The driving mechanism 31 is a motor.
[0038] The rotating mechanism 3 is fixedly connected to the middle of the screen assembly 2 through the fixing assembly 5, thereby fixing the screen assembly 2 from the inside.
[0039] Specifically, a hollow shaft 24 is erected in the middle of each screen component 21, and the hollow shaft 24 is fixedly connected to the bottom of the screen component 21 and passes through the bottom of the screen component 21. The hollow shafts of several screen components 21 are stacked in sequence, and the rotating shaft 32 extends into the stacked hollow shafts 24 and is fixedly connected to the hollow shaft 24 through the fixing component 4.
[0040] The fixing assembly 4 includes a pin 41. The hollow shaft 24 and the rotating shaft 32 are both provided with through holes along the radial direction. The hollow shaft 24 and the rotating shaft 32 are connected by the pin 41 inserted into the through holes. The connection between the pin 41 and the hollow shaft 24 is fixed by a bolt 42.
[0041] The flushing assembly 5 includes an upright flushing water branch pipe 51, on which a plurality of flushing nozzles 52 are provided. The flushing nozzle 52 at the uppermost end of the flushing water branch pipe 51 is directed obliquely downward toward the outside of the screen member 21, while the flushing nozzle 52 at the lowermost end of the flushing water branch pipe 51 is directed obliquely upward toward the outside of the screen member 21. Specifically, the flushing nozzle 52 at the uppermost end of the flushing water branch pipe 51 and the flushing nozzle 52 at the lowermost end of the flushing water branch pipe 51 are angled between the flushing water branch pipe 51 and the flushing water branch pipe 51 in a range of 30° to 90°. The flushing nozzle 52 at the middle portion of the flushing water branch pipe 51 is directed horizontally toward the outside of the screen member 21.
[0042] The flushing water branch pipe 51 is quick-connect type and easy to disassemble and assemble; after the flushing water enters the screening cylinder, it is evenly distributed into several branch pipes and set on the back of the screen. The nozzles evenly distributed on the branch pipes enable the screen to form a backwashing effect.
[0043] The flushing water pipeline is provided with a control valve, and the flushing water branch pipe 51 is provided with a flushing branch pipe control valve 53; the drain port 13 is connected to the drain pipe 61, and the drain pipe 61 is provided with a drain valve 62, and the discharge of waste liquid and ultrafine materials is controlled by the drain valve 62.
[0044] Furthermore, a sealing ring 12 is provided at the connection between the barrel body 11 and the rotating shaft 32 to prevent water leakage.
[0045] Furthermore, a hanging lug 23 is provided on the top of the screen member 21 to facilitate taking the screen member 21. Furthermore, the number of the hanging lugs 23 is greater than or equal to 2.
[0046] Furthermore, the ratio of the height to the inner diameter of the mesh member 21 satisfies Hn / Dn≥1.
[0047] Furthermore, the ratio of the gap between adjacent screen components 21 to the inner diameter of the screen component 21 with the larger aperture satisfies bn / Dn=0.1-0.5 (the adjacent screen spacing bn is designed to meet the accommodating material space and the installation space of the flushing water pipeline, bn≥5cm).
[0048] When in use, the screen components 21 with different screen apertures are nested and placed on the turntable 33; the position of the screen component 21 is adjusted so that its center is located at the center of the turntable 33, the rotating shaft 32 passes through the center of the turntable 33 and extends into the stacked hollow shaft 24, the pin 41 is inserted into the through holes of the hollow shaft 24 and the rotating shaft 32, and the pin 41 is fixed with a bolt 42.
[0049] During screening operation, the material is introduced into the innermost screen component 21 in the middle from the top of the screen assembly 2, the driving mechanism 31 is turned on, the main control valve 55 of the flushing water inlet pipe 54 and the flushing branch pipe control valve 53 are opened, and the flushing nozzle 52 sprays water toward the screening component 21. The driving mechanism 31 drives the turntable 33, and then drives the screening assembly 2 to rotate, generating centrifugal force, so that the material passes through the screening components 21 with different screening apertures from the middle in turn to achieve grading. The liquid exists in the barrel and is discharged through the drain outlet 13.
[0050] In the description of the present invention, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0051] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0052] The specific implementation methods described above are preferred implementation methods of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the shape and structure of the present invention are within the scope of protection of the present invention.
Claims
1. A wet sieving instrument, characterized in that: It includes a centrifugal screening barrel and a rotating mechanism. The centrifugal screening barrel includes a barrel body, a screen assembly and a flushing assembly connected to a flushing water pipeline are arranged inside the barrel body, the screen assembly includes a plurality of nested screen members, and the side walls of the screen members are provided with a plurality of screen holes; the screen holes of the screen members decrease from the middle of the screen assembly outward; an annular channel for receiving accumulated material on the screen is formed between adjacent screen members; the flushing assembly is located on the outside of each screen member, and the water spray port of the flushing assembly faces the outer wall of the screen member; The rotating mechanism is fixedly connected to the middle of the screen assembly to drive the screen assembly to rotate; and a drainage port is provided at the bottom of the barrel body.
2. The wet sieving apparatus according to claim 1, wherein: The rotating mechanism includes a driving mechanism, a rotating shaft and a turntable. The turntable is located in the barrel body. The driving mechanism is connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to the turntable. The turntable is connected to the screen assembly to drive the screen assembly to rotate.
3. The wet sieving apparatus according to claim 2, wherein: A hollow shaft is erected in the middle of the screen component, and the hollow shaft is fixedly connected to the bottom of the screen component and passes through the bottom of the screen component. The hollow shafts of several screen components are stacked in sequence, and the rotating shaft extends into the stacked hollow shafts and is fixedly connected to the hollow shafts through a fixing assembly.
4. The wet sieving apparatus according to claim 3, wherein: The fixing assembly includes a pin, and the hollow shaft and the rotating shaft are both provided with through holes along the radial direction. The hollow shaft and the rotating shaft are connected by the pin inserted into the through holes.
5. The wet sieving apparatus according to claim 4, characterized in that: The connection between the pin and the hollow shaft is fixed by a bolt.
6. The wet sieving apparatus according to any one of claims 2 to 5, characterized in that: A sealing ring is provided between the barrel body and the rotating shaft; and a hanging ear is provided on the top of the screen component.
7. The wet sieving apparatus according to claim 6, characterized in that: The number of the hanging ears is two or more, the ratio of the height to the inner diameter of the screen component Hn / Dn≥1, and the ratio of the gap between adjacent screen components to the inner diameter of the screen component with the larger aperture satisfies bn / Dn=0.1-0.
5.
8. The wet sieving apparatus according to any one of claims 1 to 5, characterized in that: The flushing assembly includes an upright flushing water branch pipe, on which a plurality of flushing nozzles are provided. The flushing nozzle located at the uppermost end of the flushing water branch pipe is obliquely downward toward the outside of the screen component, and the flushing nozzle located at the lowermost end of the flushing water branch pipe is obliquely upward toward the outside of the screen component.
9. The wet sieving apparatus according to claim 8, characterized in that: The angle between the flushing nozzle located at the uppermost end of the flushing water branch pipe and the flushing nozzle located at the lowermost end of the flushing water branch pipe and the flushing water branch pipe is 30°-90°; a main control valve is provided on the flushing water pipeline, and a flushing branch pipe control valve is provided on the flushing water branch pipe; the drain outlet is connected to a drain pipe, and the drain pipe is provided with a drain valve.