Rotary wet screening instrument

Abstract

The utility model provides a rotary wet process screening instrument, it includes centrifugal screening barrel and rotating mechanism, centrifugal screening barrel includes barrel body, be equipped with screen cloth subassembly and the flushing subassembly that connects the flushing water inlet pipe in the barrel body, screen cloth subassembly includes a plurality of nesting setting screen cloth component, and the rotating mechanism is connected with the flushing water inlet pipe. A plurality of screen holes are formed in the side wall of the screen component; the screen mesh apertures of the screen mesh components are sequentially reduced from the middle part of the screen mesh assembly to the outside; an annular channel used for receiving accumulated materials on the screen is formed between every two adjacent screen components. The flushing assembly is located on the outer side of each screen component, and a water spraying opening of the flushing assembly faces the outer side wall of the screen component; the rotating mechanism is connected with the screen assembly and fixedly connected with the outer side of the screen assembly through a fixing assembly. By adopting the technical scheme of the utility model, the unit area load on the surface of the screen is lower, and the experiment precision and the experiment efficiency are high; the structure is more compact, lighter and more practical; the hydraulic efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of screening, in particular to a rotary wet screening instrument. Background Art

[0002] Particle size distribution is an important indicator of particle fineness and classification. Wet sieving is the most common and accurate method for testing particle size distribution. According to testing standards, the wet sieving test range for fine materials is generally between 20μm and 2mm. A wet sieving instrument is an experimental instrument used to test the particle size distribution of particles. It can screen and test a variety of organic and inorganic particles and is widely used in soil, gravel, mining, medicine, food, agriculture, and other fields.

[0003] The general steps of the wet screening experiment are: select the required set of sieves from fine to coarse and stack them on the base of the sieving instrument with the wastewater collection chassis, then weigh a certain amount of sample and pour it into the top sieve, or make the weighed sample into a suspension and pour it from the top; then add flushing water from the top of the test sieve to carry out the screening experiment.

[0004] 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 particles 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 screen sets used in the experiment is greater than 3, the flushing water has almost no hydraulic flushing effect on the particles on the bottom surface of the screen. The aperture of the bottom screen is often small, which can easily cause the screen to be blocked. When the particles are more 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. Utility Model Content

[0005] In view of the above technical problems, the utility model discloses a rotary wet sieving instrument, which effectively improves the experimental accuracy and efficiency.

[0006] To this end, the technical solution of the present utility model is:

[0007] A rotary 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 inlet pipe 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; the screen aperture of the screen member decreases from the middle of the screen assembly to the outside; 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 is facing 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 outside of the screen assembly through a fixing assembly to prevent the screen assembly from shifting during rotation; a drain outlet is provided at the bottom of the barrel body, and the separated liquid can be discharged from the drain outlet.

[0008] By adopting this technical solution, the liquid containing particles to be screened is added to the middle of the screen assembly, the rotating mechanism is started, the screen assembly is driven to rotate by the rotating mechanism, water is introduced through the flushing water inlet pipe, and the water spray port 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, thereby forming a backwash, so that the material accumulated on the surface of the screen component forms a fluidized state, the material accumulated on the screen surface is redispersed, and the material stuck in the gaps of the screen can be washed away; and the flushing assembly is arranged in the 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 having low flushing water consumption.

[0009] 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 increases gradually, meaning its surface area also increases linearly and stepwise, reducing the material load on the screen. Furthermore, the larger the inner diameter of the screen element, the greater the centrifugal force on the particles on the screen element surface, which better helps sticky small particles and flushing water 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.

[0010] After the wet screening is completed, the flushing water inlet pipe is closed. The sieving instrument can also centrifugally dehydrate the material, effectively shortening the subsequent drying time. Compared with the traditional wet screening instrument, the overall experimental process of this solution can shorten the experimental time by about half.

[0011] 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, and the other end of the rotating shaft is connected to the turntable. The turntable is connected to the bottom of the screen assembly to drive the screen assembly to rotate.

[0012] As a further improvement of the present invention, the fixing assembly includes a fixing rod, the lower portion of the fixing rod is fixedly connected to the turntable, and the upper portion of the fixing rod is connected to the outer side of the screen assembly via a fixing buckle.

[0013] As a further improvement to the present invention, the turntable is provided with a radially U-shaped groove, the lower portion of the fixing rod extending into the U-shaped groove, and the fixing rod is connected to the turntable at the upper and / or lower sides of the U-shaped groove via fixing members. Furthermore, the fixing members are bolts. This technical solution can accommodate screen assemblies of varying sizes, and the screen assembly can be externally fixed by adjusting the position of the fixing rod within the U-shaped groove according to the size of the screen assembly.

[0014] As a further improvement of the present invention, adjacent screen members are fixed by screen fixing members, and the screen fixing members are located at the bottom of the annular channels of adjacent screen members.

[0015] As a further improvement to the present invention, the screen fixing member is a U-shaped fixing member or an adjustable V-shaped fixing member. If the inner diameter of each screen member is pre-set, that is, the spacing between adjacent screen members is fixed, then the U-shaped fixing member can be directly used for fixing. However, during experiments, not all sizes of screen members are selected every time, and the spacing between adjacent screen members may vary. In this case, the screen can be fixed with an adjustable V-shaped fixing member.

[0016] Furthermore, the V-shaped fixing member includes two support rods, one end of which is connected by a rotating shaft, and the connection between the two support rods is provided with a fixed support member and an elastic element, and the other end of each support rod is provided with a fixed connection member for fixed connection to the screen member. Furthermore, the fixed connection member is an elastic ring clamp.

[0017] 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.

[0018] As a further improvement of the present invention, a hanging ear is provided on the top of the screen component.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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°.

[0023] As a further improvement of the present invention, a control valve is provided on the flushing water inlet pipe, 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.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The technical solution of this utility model separates and grades materials through the action of centrifugal force, and the mesh is arranged on the side wall. Compared with traditional test sieves with mesh arranged at the bottom and stacked up, the screening device with the same base area has a larger screening specific surface area, which can accommodate more experimental materials and has a lower load per unit area of ​​the material passing through the mesh surface, thereby improving experimental accuracy and efficiency. It also has a more compact structure, is lighter and more practical, has high hydraulic efficiency, low cleaning water consumption, and reduces experimental waste liquid. Moreover, a single device can achieve multiple functions, performing screening experiments and centrifugal dehydration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a rotary wet sieving instrument according to Example 1 of the present utility model.

[0027] Figure 2 This is a schematic diagram of the flushing water distribution and material flow of a rotary wet screening instrument in Example 1 of the present utility model.

[0028] Figure 3 It is a structural schematic diagram of the fixing assembly of Example 1 of the present utility model.

[0029] Figure 4 It is a structural schematic diagram of the turntable of Example 1 of the present utility model.

[0030] 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.

[0031] Figure 6 It is a schematic cross-sectional structure diagram of the screen assembly of Example 1 of the present invention.

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure of the screen assembly of Example 1 of the present invention.

[0033] Figure 8 It is a structural schematic diagram of the screen fixing member of Example 1 of the present utility model.

[0034] Figure 9 It is a structural schematic diagram of the screen assembly of Example 2 of the present invention.

[0035] Figure 10 It is a structural schematic diagram of the screen fixing part of Example 2 of the present utility model.

[0036] Reference numerals include:

[0037] 1- centrifugal screening barrel, 2- screen assembly, 3- rotating mechanism, 4- fixed assembly, 5- flushing assembly, 6- drainage pipe;

[0038] 11-barrel body, 12-sealing ring, 13-drain port;

[0039] 21-screen member, 22-annular channel, 23-hanging ear, 24-U-shaped fixing piece, 25-V-shaped fixing piece; 251-support rod, 252-fixed support rod, 253-elastic element, 254-fixed connecting piece;

[0040] 31-driving mechanism, 32-rotating shaft, 33-turntable, 35-U-shaped groove;

[0041] 41-fixing rod, 42-fixing buckle, 43-bolt;

[0042] 51-flushing water branch pipe, 52-flushing nozzle, 53-flushing branch pipe control valve, 54-flushing water inlet pipe, 55-main control valve;

[0043] 61-drain pipe, 62-drain valve. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0045] Example 1

[0046] like Figures 1 to 8 As shown, a rotary 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 inlet pipe 54 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 outlet 13 is provided at the bottom of the barrel body 11, and the drain outlet 13 is connected to the drainage pipe 6, and the separated liquid can be discharged from the drain outlet 13.

[0047] 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 contacts the bottom of the screen assembly 2 to drive the screen assembly 2 to rotate. The driving mechanism 31 is a motor.

[0048] The rotating mechanism 3 is fixedly connected to the screen assembly 2 via a fixing assembly 4. In this embodiment, the rotating mechanism 3 fixes the screen assembly 2 from the outside. Specifically, the rotating disk 33 is fixedly connected to the screen assembly 2 via the fixing assembly 4. The fixing assembly 4 includes a fixing rod 41. The lower portion of the fixing rod 41 is fixedly connected to the rotating disk 33. The upper portion of the fixing rod 41 is connected to the outer side of the screen assembly 2 via a fixing buckle 42, thereby fixing the screen assembly 2 in place.

[0049] Furthermore, the turntable 33 is provided with a U-shaped groove 34 along the radial direction. In this embodiment, four U-shaped grooves 34 are symmetrically provided. The lower portion of the fixing rod 41 extends into the U-shaped groove 34. The fixing rod 41 is connected to the turntable 33 at the upper and lower sides of the U-shaped groove 34 by bolts 43. During use, the screen assembly 2 can be externally fixed by moving the fixing rod 41 within the U-shaped groove 34 according to the size of the screen assembly 2. Furthermore, the number of the fixing rods 41 is greater than or equal to two. Furthermore, the plurality of fixing rods 81 are evenly arranged.

[0050] Adjacent screen members 21 are fixed by screen fixing members, which are U-shaped fixing members 24 . The U-shaped fixing members 24 are located at the bottom of the annular channels of adjacent screen members 21 and are connected to two adjacent screen members 21 respectively.

[0051] 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.

[0052] 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.

[0053] The flushing water inlet pipe 54 is provided with a main control valve 55, and the flushing water branch pipe 51 is provided with a flushing branch pipe control valve 53; the drain outlet 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.

[0054] Furthermore, a sealing ring 12 is provided at the connection between the barrel body 11 and the rotating shaft 32 to prevent water leakage.

[0055] Furthermore, a hanging ear 23 is provided on the top of the screen member 21, which can be used for fixing and conveniently taking the screen member 21. Furthermore, the number of the hanging ears 23 is greater than or equal to 2.

[0056] Furthermore, the ratio of the height to the inner diameter of the mesh member 21 satisfies Hn / Dn≥1.

[0057] Furthermore, the ratio of the gap between adjacent screen members 21 to the inner diameter of the screen member with the larger aperture satisfies bn / Dn=0.1-0.5 (the spacing bn between adjacent screens is designed to meet the accommodating material space and the installation space of the washing water branch pipe, bn≥5cm).

[0058] When in use, the screen components 21 with different screen apertures are nested and placed on the turntable 33; the position of the screen components 21 is adjusted so that their centers are located at the center of the turntable 33, and the outermost screen components 21 are connected to the upper part of the fixing rod 41 through the fixing buckle 42. Adjacent screen components 21 are fixed by screen fixing parts. Then, 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. The driving mechanism 31 drives the turntable 33, and then drives the screening component to rotate, generating centrifugal force, so that the material passes through the screening components with different screen apertures from the middle in turn to achieve grading. The liquid is stored in the barrel and discharged through the drain port 13.

[0059] Example 2

[0060] like Figure 9 and Figure 10 As shown, based on Example 1, the difference of this embodiment is that the screen fixing member is a V-shaped fixing member 25, that is, the adjacent screen components 21 are fixed by an adjustable V-shaped fixing member 25, and the adjustable V-shaped fixing member 25 is located at the bottom of the annular channel of the adjacent screen component 21 and is respectively connected to the two adjacent screen components 21.

[0061] like Figure 10 As shown, the V-shaped fixing member 25 includes two support rods 251, one end of which is connected by a rotating shaft. The connection between the two support rods 251 is provided with a fixed support rod 252 and an elastic element 253. The other end of each support rod 251 is provided with a fixed connecting member 254 for fixed connection to the screen member 21. The fixed connecting member 254 is an elastic ring clamp. The elastic element 253 is a spring.

[0062] 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.

[0063] 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.

[0064] 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 rotary wet sieving apparatus, 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 inlet pipe are arranged in 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 connected to the screen assembly to drive the screen assembly to rotate; the rotating mechanism is also fixedly connected to the outer side of the screen assembly through a fixing assembly, and a drain outlet is provided at the bottom of the barrel body.

2. The rotary wet sieving apparatus according to claim 1, characterized in that: 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 bottom of the screen assembly to drive the screen assembly to rotate.

3. The rotary wet sieving apparatus according to claim 2, characterized in that: The fixing assembly includes a fixing rod, the lower portion of the fixing rod is fixedly connected to the turntable, and the upper portion of the fixing rod is connected to the outer side of the screen assembly via a fixing buckle.

4. The rotary wet sieving apparatus according to claim 3, characterized in that: The turntable is provided with a U-shaped groove in the radial direction, the lower portion of the fixing rod extends into the U-shaped groove, and the fixing rod and the turntable are connected via fixing members on the upper side and / or lower side of the U-shaped groove.

5. The rotary wet sieving apparatus according to claim 2, characterized in that: Adjacent screen members are fixed by screen fixing pieces, and the screen fixing pieces are located at the bottom of the annular channels of the adjacent screen members.

6. The rotary wet sieving apparatus according to claim 5, characterized in that: The screen fixing piece is a U-shaped fixing piece or an adjustable V-shaped fixing piece.

7. The rotary wet sieving apparatus according to claim 6, characterized in that: The V-shaped fixing member includes two support rods, one end of the two support rods is connected by a rotating shaft, a fixed support member and an elastic element are provided at the connection between the two support rods, and the other end of the two support rods is provided with a fixed connecting member for connecting to the corresponding screen component.

8. The rotary wet sieving apparatus according to any one of claims 2 to 7, characterized in that: A sealing ring is provided between the barrel body and the rotating shaft; a hanging ear is provided on the top of the screen component; 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.

9. The rotary wet sieving apparatus according to any one of claims 1 to 7, 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.

10. The rotary wet sieving apparatus according to claim 9, 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 inlet pipe, 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.

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