Screening net and screening machine

Abstract

The utility model discloses a screening net and a screening machine, the screening net is used for fully screening materials to be screened, and the screening net comprises a screening net body, a screening net outer ring, a discharging opening, a discharging opening valve and a discharging receiving disc; the screen outer ring is of a cylindrical structure with two open ends, the screen outer ring is arranged around the screen, the inner wall of the screen outer ring is tightly and fixedly connected with the edge of the screen, and the discharge port is formed in the side wall of the screen outer ring; the discharging receiving disc is fixedly connected to the outer wall of the screen outer ring. The discharging receiving disc is aligned with the discharging opening; the discharge port valve is arranged on the discharge port so that the discharge port can be opened or closed. Therefore, when materials are screened by the screen, the valve of the discharging port can be closed to prevent the materials from being discharged, so that the materials are fully screened on the screen, the valve of the discharging port is opened after the materials are fully screened, the screened materials are discharged through the discharging port, the screened materials are all materials meeting the specific particle size range, and the material percent of pass is improved.

Description

Technical Field

[0001] This application relates to the field of granulation technology, specifically to a screening screen and a screening machine. Background Technology

[0002] In the production of heated non-combustible granular tobacco cartridges, or in the preparation of granular pharmaceuticals or granular food, it is often necessary to prepare granules within a specific particle size range. Related technologies involve sieving materials of different particle sizes using a sieve. By installing sieves of different mesh sizes on a sieve machine, materials are first sieved through a large-pore sieve to remove particles smaller than the upper limit size, and then through a small-pore sieve to remove particles smaller than the lower limit size. The material remaining, falling between the upper and lower limit particle sizes, is the desired material. A discharge port for material output is provided between the large-pore and small-pore sieves.

[0003] However, when too much material is poured in for sieving, some material is not completely sieved and is discharged from the outlet, resulting in a mixture of qualified and unqualified products. This means that there may be material with a particle size smaller than the lower limit, which reduces the material qualification rate. Utility Model Content

[0004] This application provides a screening mesh and a screening machine to solve the problem in the prior art that the material is not fully screened when it is vibrated to the discharge port.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a screening mesh, including: a screen, an outer ring of the screen, and a discharge port; the outer ring of the screen is a cylindrical structure with openings at both ends, and the outer ring of the screen is arranged around the screen, with the inner wall of the outer ring of the screen tightly fixedly connected to the edge of the screen; a discharge port is provided on the side wall of the outer ring of the screen; one end of the discharge port near the screen is flush with the plane of the screen; the screening mesh also includes a discharge port valve and a discharge receiving plate, the discharge receiving plate being fixedly connected to the outer wall of the outer ring of the screen; the discharge receiving plate being aligned with the discharge port; the discharge port valve is provided on the discharge port so that the discharge port has an open or closed state.

[0007] In one embodiment, the discharge port valve includes a door panel and a push rod, and the discharge port valve is movably connected to the outer ring of the screen; the discharge receiving plate is provided with a push rod mounting channel; one end of the push rod is movably connected to the door panel, the other end of the push rod is provided with a handle, and the push rod passes through the push rod mounting channel, with the handle exposed outside the discharge receiving plate.

[0008] In one embodiment, a limit block is provided at one end of the push rod, and a snap-fit ​​structure is fixedly connected to the door panel, with the limit block snap-fitted into the snap-fit ​​structure; and / or a locking device is provided on the push rod, the locking device being used to lock the push rod to the push rod mounting channel.

[0009] In one embodiment, the snap-fit ​​structure consists of two rod-shaped structures. Each rod-shaped structure includes two first rods and one second rod. One end of each of the two first rods is positioned at a preset angle and interval on the side of the door panel near the push rod. The other ends of the two first rods are connected through the two ends of the second rod. The two rod-shaped structures are positioned at a preset interval on the side of the door panel near the push rod, and the preset interval is smaller than the outer contour dimension of the limiting block.

[0010] In one embodiment, the discharge port valve is movably connected to the side of the discharge port away from the screen. The discharge port valve includes a door plate and two magnetic devices. The magnetic devices include a first magnetic device and a second magnetic device. The first magnetic device is fixed to the side of the discharge port valve away from the screen, and the second magnetic device is set at a preset distance on the side of the discharge port valve away from the screen to change the direction of the current and thus change the magnetic poles of the magnetic devices, so that the discharge port has an open or closed state.

[0011] In one embodiment, the screen and the outer ring of the screen are connected by a sealing ring, and a filling layer is provided at the gap between the sealing ring and the screen.

[0012] In one embodiment, the filler material of the filler layer is an adhesive, and the width of the filler layer is 0.5-10cm.

[0013] This application provides a screening machine, including at least two screening screens, a vibrating device, a chassis, and fixing members. The screening screens are stacked to form a stacked structure, and the fixing members are provided between the screening screens to fix adjacent screening screens to each other. The chassis is provided at the bottom of the stacked structure. The chassis is mounted on the vibrating device. Each screening screen has a different mesh size, and the mesh size of the screening screen closer to the vibrating device is smaller.

[0014] In one embodiment, the fastener is a circular structure with a notch, and a fastening device is provided at the notch. The fastening device is used to adjust the circumference of the fastener to fit the circumference of the screening screen.

[0015] In one embodiment, the device further includes a control device for controlling the vibration duration of the vibration device and the opening and closing of the discharge port valve.

[0016] According to the screening mesh of the above embodiment, the screen mesh is a circular structure with neatly arranged screen holes on its surface. The screen holes on a single screen mesh are of uniform size, ensuring that the diameter of the material passing through the screen mesh is smaller than the screen holes. The outer ring of the screen mesh is a cylindrical structure with a diameter slightly larger than that of the screen mesh. The outer ring of the screen mesh is arranged around the screen mesh and has a certain height to prevent material from leaking out from the edge of the screen mesh during screening. The screening mesh has a certain volume to hold the material being screened. At the same time, when performing more complex screening tasks, multiple screening meshes with different mesh sizes need to be used in combination. In this case, the outer ring of the screen mesh forms a support structure. The discharge port is located on the side wall of the outer ring of the screen mesh, and one end close to the screen mesh is flush with the plane on which the screen mesh is located. The material moves continuously on the screen, sieving out materials with diameters smaller than the screen holes, while materials with diameters larger than the screen holes remain on the screen. Larger diameter materials move closer to the discharge port during movement, and unlike other locations where the outer ring of the screen can block them back onto the screen, the discharge port allows materials to be discharged directly from it. The discharge port achieves the sieving effect by catching and collecting materials with diameters larger than the screen holes. A discharge valve is located on the discharge port, allowing it to be opened or closed. When screening materials, it is necessary to use screening screens with different mesh sizes according to the required particle size. If too much material is poured in at once, some material will be discharged from the outlet without being fully screened, resulting in the mixing of materials of different particle sizes. This means that there may be materials with particle sizes that do not meet the requirements, reducing the material qualification rate. When the outlet valve can be closed, the outlet valve prevents the material from being discharged, allowing the material to be fully screened on the screen. After full screening, the outlet valve is opened, and the material screened out of the screen holes has undergone full screening. Materials with particle sizes smaller than the lower limit have been screened out of the screen holes, improving the material qualification rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a screening screen in one embodiment;

[0018] Figure 2 This is a schematic diagram of another structure of the screening screen in one embodiment;

[0019] Figure 3 This is a schematic diagram of another structure of the screening screen in one embodiment;

[0020] Figure 4 This is a schematic diagram of the structure of a screening machine in one embodiment;

[0021] Figure 5 This is a schematic diagram of a standard screening machine.

[0022] The attached diagram is labeled as follows: 11-Screw; 12-Outer ring of the screen; 21-Discharge port; 13-Discharge port valve; 14-Discharge receiving tray; 15-Door panel; 16-Push rod; 17-Push rod installation channel; 18-Handle; 19-Limit block; 110-Locking device; 111-First rod body; 112-Second rod body; 113-Discharge receiving tray outlet; 22-First magnetic device; 23-Second magnetic device; 31-Sealing ring; 32-Filling layer; 41-Vibration device; 42-Chassis; 43-Fixing component; 44-Fastening device; 51-Control device; 52-Fixed base plate; 53-Pressing collar; 54-Fixed screw; 55-Fixed nut. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0024] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0025] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0026] The mesh count of a sieve is expressed as the number of mesh openings per square centimeter. A larger mesh count indicates a finer particle size, while a smaller mesh count indicates a larger particle size. Particle size is the size of the mesh openings through which particles can pass.

[0027] To obtain materials of the desired particle size, a screening screen is needed to screen the materials. By placing the screening screen on a screening machine, the vibrating device inside the screening machine rotates the screening screen, causing the materials inside the screening screen to move to the outer ring of the screen after screening. The outer ring of the screen has a discharge port, allowing materials that do not pass through the screen to be discharged from the discharge port, thus completing the screening objective.

[0028] During the screening process, if too much material is poured into the screen at once, some material will move to the outer edge of the screen without being screened and will be discharged from the outlet, resulting in a mixture of qualified and unqualified materials and reducing the material qualification rate. Controlling the speed and quantity of material poured into the screen requires manual operation by experienced personnel, and this operation, based on experience, is subjective and detrimental to standardized production, while also increasing labor costs. Another approach is to observe the state of the qualified products discharged from the outlet and perform a second screening if unqualified products are found. However, subjective judgment regarding whether to perform a second screening is also detrimental to standardized production, and second screening is not conducive to continuous production, reducing production efficiency.

[0029] The screen and the outer ring of the screening mesh are connected by a sealing ring. There are gaps between the sealing ring and the screen, and between the sealing ring and the outer ring of the screen. These gaps can trap the material being screened. Qualified material is stuck in the gaps, which reduces the pass rate and makes cleaning more difficult.

[0030] like Figure 1 As shown in the embodiment of this application, a screening mesh is proposed for fully screening materials to be screened. The screening mesh includes: a screen 11, an outer ring 12, and a discharge port 21. The outer ring 12 is a cylindrical structure with openings at both ends. The outer ring 12 surrounds the screen 11. The inner wall of the outer ring 12 is tightly fixedly connected to the edge of the screen 11. The discharge port 21 is provided on the side wall of the outer ring 12. The end of the discharge port 21 near the screen 11 is flush with the plane of the screen 11. The screening mesh also includes a discharge port valve 13 and a discharge receiving plate 14. The discharge receiving plate 14 is fixedly connected to the outer wall of the outer ring 12. The discharge receiving plate 14 is aligned with the discharge port 21. The discharge port valve 13 is provided on the discharge port 21 so that the discharge port 21 has an open or closed state.

[0031] In this embodiment, the screen 11 is a circular structure with neatly arranged screen holes on its surface. The screen holes on a single screen 11 are all the same size, ensuring that the diameter of the material that can pass through the screen is smaller than the screen holes. The outer ring 12 of the screen is a cylindrical structure with a diameter slightly larger than that of the screen 11. The outer ring 12 surrounds the screen 11 and has a certain height to prevent material from leaking out from the edge of the screen 11 during screening. The screening screen has a certain volume to hold the material being screened. Furthermore, when performing more complex screening tasks, multiple screening screens with different mesh sizes are needed in combination. In this case, the outer ring 12 forms a support structure. The discharge port 21 is located on the side wall of the outer ring 12, and one end near the screen 11 is flush with the plane of the screen 11. Material passes through the screen... The screen 11 moves continuously, sieving out materials with a diameter smaller than the screen holes. Materials with a diameter larger than the screen holes remain on the screen 11. During the movement, the larger diameter materials approach the discharge port 21. Unlike other locations where the outer ring 12 of the screen can block the materials back onto the screen 11, the discharge port 21 does not intercept the materials and allows them to be discharged. Materials with a diameter smaller than the screen holes are sieved out through the screen holes, while materials with a diameter larger than the screen holes are discharged from the discharge port, thus achieving the effect of sieving. The discharge receiving plate 14 is fixedly connected to the outer wall of the outer ring 12 of the screen. When materials with a diameter larger than the screen holes are discharged from the discharge port, the discharge receiving plate can catch and collect the materials. The discharge port valve 13 is set on the discharge port 21, allowing the discharge port 21 to be in an open or closed state. When screening materials, different mesh sizes of sieves are used according to the required particle size. If too much material is poured in at once, some material will be discharged from the discharge port 21 without being fully screened, resulting in the mixing of materials of different particle sizes. This means that there may be materials whose particle size does not meet the requirements, reducing the material qualification rate. When the discharge port valve can be closed, the discharge port valve 13 prevents the material from being discharged, allowing the material to be fully screened on the sieve 11. After full screening, the discharge port valve 13 is opened, and the material that meets the required particle size remains on the sieve 11 and is discharged from the discharge port valve 12. The material smaller than the lower limit particle size is screened out of the sieve 11, reducing the proportion of unqualified products and increasing the proportion of qualified products, thus improving the material qualification rate.

[0032] It should be noted that the aforementioned qualified products refer to materials whose particle size meets the required range. The qualified rate is calculated by calculating the proportion of qualified products in the total material. In actual operation, the method of generating qualified products is not limited to sieving through the sieve holes. If the material needs to be screened and contains some finer impurities, then the material passing through the discharge port 21 is considered unqualified, and the material discharged from the discharge port 21 is considered qualified. If the screening process is not fully carried out, fine impurities will be discharged from the discharge port 21 into the discharge receiving tray 14 along with the qualified products. Although the proportion of material in the discharge receiving tray is increasing, it contains impurities. Therefore, the definition of qualified products and the resulting effects need to be distinguished according to the actual situation, and this application does not make further limitations.

[0033] It should be noted that the end of the discharge port 21 near the screen 11 can be flush with the plane of the screen 11, or the end of the discharge port 21 near the screen 11 can be slightly lower than the plane of the screen 11 and connected by a chamfering process, so that the material can be discharged from the discharge port 21 more easily.

[0034] One embodiment, referring to Figure 1 The discharge valve 13 includes a door plate 15 and a push rod 16. The door plate 15 is movably connected to the outer ring 12 of the screen. The discharge receiving plate 14 is provided with a push rod mounting channel 17. One end of the push rod 16 is movably connected to the door plate 15, and the other end of the push rod 16 is provided with a handle 18. The push rod 16 passes through the push rod mounting channel 17, and the handle 18 is exposed outside the discharge receiving plate 14.

[0035] In this embodiment, the discharge valve 13 is located between the screening screen and the discharge receiving plate 14, making it difficult to change the opening or closing state of the discharge valve 13. Through the push rod mounting channel 17 provided in the discharge receiving plate 14, the operator can control the opening and closing of the discharge valve 13 by pushing the push rod 16 away from the screening screen, making it easier for the operator to control the opening or closing state of the discharge valve and increasing the convenience of using the screening screen.

[0036] In some embodiments, the opening size of the discharge valve 13 when it is in the open state can be controlled by controlling the length of the push rod 16, so that the material can fall into the discharge port 21 more easily.

[0037] In some embodiments, reference Figure 1-2The connection position between the discharge valve 13 and the discharge port 21 can be determined according to the direction of material vibration. For example, when the vibration direction is clockwise, as shown by the arrow in the figure, the material will gradually move from side A of the discharge port 21 to side B of the discharge port 21. At this time, the discharge valve 13 and side B of the discharge port 21 are movably connected. When the discharge valve 13 is opened, it will gather the material in the vibration and make it fall into the discharge port 21, thus accelerating the speed of material collection after full screening.

[0038] In some embodiments, reference Figure 1 The discharge tray 14 is provided with a discharge tray outlet 113, which facilitates the collection of materials after the discharge tray 14 receives the materials through the discharge tray outlet 113.

[0039] One embodiment, referenced Figure 1 One end of the push rod 16 is provided with a limit block 19, and the door panel 15 is fixedly connected with a snap-fit ​​structure, in which the limit block 19 is snap-fitted; and / or the push rod 16 is provided with a locking device 110, which is used to lock the push rod 16 to the push rod mounting channel 17.

[0040] In this embodiment, the limiting block 19 is snapped into the snap-fit ​​structure of the door panel 15, so that the push rod can control the opening and closing state of the discharge port valve 13. At the same time, the snap-fit ​​structure gives the limiting block 19 a certain amount of room to move, so that the push rod 16 and the discharge port valve 13 can perform their functions more smoothly, improving the user experience.

[0041] In some embodiments, the structure of the limiting block 19 can be cross-shaped, circular, square, regular pentagonal, snowflake-shaped, etc., so that the limiting block 19 is more firmly engaged in the engaging structure.

[0042] In some embodiments, the limiting block 19 can be welded to one end of the push rod 16. If the push rod 16 is made of screw and the limiting block 19 is made of nut, the nut will be affected by the vibration device 41 when the screening machine is working, and will gradually move outward and fall off, requiring reinstallation. Welding the screw can effectively prevent the limiting block 19 from being affected by vibration and thus loosening and falling off.

[0043] In this embodiment, the locking device 110 on the push rod 16 can lock the length of the push rod 16 extending into the screening mesh, thereby controlling the opening size of the discharge valve 13 and preventing the opening size of the discharge valve 13 from changing when the screening machine vibrates. Especially when the discharge valve 13 is closed, the screening mesh needs a period of vibration to achieve a sufficient screening effect. At this time, it is necessary to strictly require the discharge valve 13 to be in the closed state to ensure that unscreened materials will not be discharged from the discharge valve 13, thereby improving the material qualification rate.

[0044] In some embodiments, the locking device adds a reinforcing screw to the push rod mounting channel 17. By tightening the reinforcing screw, the moving space of the push rod 16 in the push rod mounting channel 17 is squeezed, and the push rod 16 is fixed by friction, so that it will not move in the extension and retraction direction due to vibration, thereby controlling the opening size of the discharge port valve 13 to remain unchanged.

[0045] One embodiment, referenced Figure 1 The snap-fit ​​structure consists of two rod-shaped structures. Each rod-shaped structure includes two first rods 111 and one second rod 112. One end of the two first rods 111 is set at a preset angle and interval on the side of the door panel 15 near the push rod 16. The other ends of the two first rods 111 are connected through the two ends of the second rod 112. The two rod-shaped structures are set at a preset interval on the side of the door panel 15 near the push rod 16, and the preset interval is smaller than the outer contour dimension of the limiting block 19.

[0046] In this embodiment, the limiting block 19 is fixed between two rod-shaped structures. During the pushing and pulling process, the push rod 16, through the limiting block 19 and the rod-shaped structures, enables the discharge port valve 13 and the push rod 16 to move in tandem. Pushing the push rod 16 can open the discharge port valve 13, and pulling back the push rod 16 can close the discharge port valve 13. The space between the rod-shaped structures ensures that when the push rod 16 moves in the extension and retraction direction, it will not affect the rotational movement of the discharge port valve 13, thus improving the smoothness of the operator when opening and closing the discharge port valve 13 and enhancing the user experience.

[0047] It should be noted that the first rod 111 is connected to the door panel 15 at a preset angle, and the angle can be set according to actual needs. For example, the angle can be 90°, 80°, or 100°, etc., and this embodiment of the application does not impose any limitations on it.

[0048] It should be noted that the two rod-shaped structures can be set in parallel or not, as long as the distance between the two rod-shaped structures is less than the outer contour dimension of the limiting block 19.

[0049] In some embodiments, the push rod 16 can be fixedly connected to the discharge port valve 13, and the push rod 16 is set in an arc shape with the projection point of the rotation axis of the discharge port valve 13 as the center, and the push rod mounting channel 17 is also set in an arc shape adapted to the push rod 16.

[0050] One embodiment, referenced Figure 2The discharge port valve 13 is movably connected to the side of the discharge port 21 away from the screen 11. The discharge port valve 13 includes a door plate 1 and two magnetic devices. The magnetic devices include a first magnetic device 22 and a second magnetic device 23. The first magnetic device 22 is fixed on the side of the discharge port valve 13 away from the screen 11. The second magnetic device 23 is set at a preset distance on the side of the discharge port valve 13 away from the screen 11 to change the direction of the current and thus change the magnetic pole of the magnetic device, so that the discharge port 21 has an open or closed state.

[0051] It should be noted that the second magnetic device 23 can change the direction of current flow in the device, thereby changing the magnetic pole of the second magnetic device 23. At the same time, the change of the current flow direction in the second magnetic device 23 can also be timed. The first magnetic device 22 can be the same as the second magnetic device 23. The magnetic pole of the first magnetic device 22 can be changed by modifying the current flow direction. At this time, the state of the discharge port 21 can be achieved by changing the magnetic pole of the first magnetic device 22 while keeping the magnetic pole of the second magnetic device 23 unchanged. Of the two methods of changing the state of the discharge port 21 by magnetic force, one of the magnetic devices does not need to change its magnetism and can use a material with fixed magnetic poles. This application does not impose any restrictions on this.

[0052] In this embodiment, the first magnetic device 22 on the discharge valve 13 and the second magnetic device 23 located on the side of the discharge valve 13 away from the screen 11 change the direction of the current flow through the second magnetic device 23, thereby changing the magnetic pole of the second magnetic device 23. When the magnetic poles of the two magnetic devices are the same, the two magnetic devices repel each other, causing the discharge valve 13 to open. When the magnetic poles of the two magnetic devices are different, the two magnetic devices attract each other, causing the discharge valve 13 to close. The direction of the current flow can be controlled and adjusted by the screening machine at a set time, so that the discharge valve 13 is kept closed within the preset screening time. After the time is over, the discharge valve 13 is automatically opened, which uniformly controls the time required for sufficient screening, which is conducive to standardized production. At the same time, the opening and closing of the discharge valve 13 is automatically realized, eliminating the need for operators to manually open and close the discharge valve 13, thus improving the efficiency of automatic production.

[0053] One embodiment, referenced Figure 3 The screen 11 and the outer ring 12 of the screen are connected by a sealing ring 31. A filling layer 32 is provided in the gap between the sealing ring 31 and the screen 11, and a filling layer 32 is provided in the gap between the sealing ring 31 and the outer ring 12 of the screen.

[0054] In this embodiment, the gap between the sealing ring 31 and the screen 11, as well as the gap between the sealing ring 31 and the outer ring 12 of the screen, are filled by the filling layer 32, making it less likely for materials to get stuck in the gaps, increasing the pass rate, and reducing the difficulty of cleaning. In addition, by setting the filling layer 32, the wear on the sealing ring 31 is reduced, which helps to extend the service life of the sealing ring 31.

[0055] In one embodiment, the filler material of the filler layer 32 is an adhesive, and the width of the filler layer is 0.5-10cm.

[0056] In this embodiment, the adhesive is made to have fluidity and a certain fixing effect after drying, so that the adhesive has a good filling effect on the gaps caused by the sealing ring 31.

[0057] In some embodiments, the width of the filling layer is 1-3cm, which minimizes the impact on the sieve openings while ensuring the filling effect of the gaps.

[0058] like Figure 4 As shown in the embodiment of this application, a screening machine is proposed for fully screening materials to be screened. The screening machine includes at least two screening screens, a vibrating device 41, a base 42, and a fixing member 43. The screening screens are stacked to form a stacked structure, and the fixing member 43 is provided between the screening screens to fix adjacent screening screens to each other. The bottom of the stacked structure is provided with a base 42. The base 42 is set on the vibrating device 41. Each screening screen has a different screen aperture, and among all screening screens, the screening screen closer to the vibrating device 41 has a smaller screen aperture.

[0059] In this embodiment, a screening machine with multiple screening screens is used to screen the material. The material that meets the size of the screening screen aperture falls sequentially from the upper screening screen and is finally collected in the base plate 42. The discharge tray 14 contains material of different particle sizes after screening. Using multiple screening screens makes the screening results more refined and can maintain good working efficiency when completing complex screening tasks.

[0060] In this embodiment of the application, the screening screens are arranged in order of aperture size from the furthest from the vibrating device 41 to the closest to the vibrating device 41, so that each layer of screening screens can screen out materials of different particle sizes.

[0061] One embodiment, such as Figure 4 As shown, the fastener 43 is a circular structure with a notch, and a fastening device 44 is provided at the notch. The fastening device 44 is used to adjust the circumference of the fastener 43 to match the circumference of the screening screen.

[0062] In this embodiment of the application, fasteners are used to fix adjacent screening screens to each other so as to ensure that the screening screens forming a stacked structure still have good stability when the vibration device 41 of the screening machine is working.

[0063] In one embodiment, the fastening device 44 includes a screw and a nut. Each end of the notch of the fastener 43 has a fixing structure in a direction away from the center. The fixing structure at one end is used to fix the screw, and the fixing structure at the other end allows the screw to pass through the hole between the fixing structures. The screw has a nut at its tail end. By tightening the nut, the distance between the screw head and the nut becomes shorter, and the two fixing structures in between become closer. The diameter of the fastener becomes smaller, and the fastener is in close contact with the adjacent screening screens. The adjacent screening screens are fixed relative to each other by friction.

[0064] In one embodiment, the screening machine includes a control device 51, which controls the vibration duration of the vibration device 41 and the opening and closing of the discharge valve 13.

[0065] In this embodiment, the vibration duration of the vibration device 41 and the opening and closing of the discharge valve 13 are controlled by the control device 51 to avoid different operations by operators due to differences in operating experience. Control by the control device makes the screening process highly uniform, which is conducive to standardized production.

[0066] like Figure 5 This is a schematic diagram of a standard screening machine, comprising a control device 51, a fixed base plate 52, a lower pressure collar 53, a fixing screw 54, a fixing nut 55, and screening screens. The fixed base plate 52 is mounted on the control device 51. Multiple screening screens are stacked on the fixed base plate 52, and the lower pressure collar 53 is placed on the stacked screening screens. There is a fixing screw 54 at each end of one diameter of the fixed base plate 52. The fixing screw 54 extends perpendicularly to the plane of the fixed base plate 52 away from the control device 51 and passes through the lower pressure collar 53. Two fixing nuts 55 are placed on the two fixing screws 54. By tightening the fixing nuts 55, the pressure between the lower pressure collar 53 and the fixed base plate 52 is increased, which increases the friction between adjacent screening screens and thus achieves a fixing effect.

[0067] Three 400g samples of the same material to be screened were taken and placed in a standard testing screening machine, the screening machine of this application embodiment, and an unoptimized screening machine (the three screening machines used the same mesh size). The equipment was started to screen the material. After screening, the weight of the graded material was weighed. The weight of the material of the same grade was divided by the total weight of the sampled material to obtain the proportion of the material distributed at each mesh size.

[0068] Table 1 shows the proportion of different grades of material screened out by three different screening machines when screening the same material. This data indicates that the screening machine in this embodiment is closer to the screening result of the standard screening machine and is better than the screening effect of the unoptimized screening machine.

[0069]

[0070] Table 1. Screening results of the same sample taken from three different screening machines.

[0071] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A screening mesh, characterized in that, include: The screen includes a screen mesh, an outer ring of the screen mesh, and a discharge port. The outer ring of the screen mesh is a cylindrical structure with openings at both ends. The outer ring of the screen mesh surrounds the screen mesh, and the inner wall of the outer ring of the screen mesh is tightly and fixedly connected to the edge of the screen mesh. A discharge port is provided on the side wall of the outer ring of the screen mesh. The end of the discharge port closest to the screen mesh is flush with the plane on which the screen mesh is located. The screening mesh also includes a discharge port valve and a discharge receiving plate. The discharge receiving plate is fixedly connected to the outer wall of the outer ring of the screen mesh. The discharge receiving plate is aligned with the discharge port. The discharge port valve is provided on the discharge port so that the discharge port can be in an open or closed state.

2. A screening mesh according to claim 1, characterized in that, The discharge valve includes a door plate and a push rod. The door plate is movably connected to the outer ring of the screen, and the discharge receiving plate is provided with a push rod installation channel. One end of the push rod is movably connected to the door panel, and the other end of the push rod is provided with a handle. The push rod passes through the push rod mounting channel, and the handle is exposed outside the discharge receiving tray.

3. A screening mesh according to claim 2, characterized in that, One end of the push rod is provided with a limit block, the door panel is fixedly connected with a snap-fit ​​structure, and the limit block is snap-fitted in the snap-fit ​​structure; and / or a locking device is provided on the push rod mounting channel, the locking device being used to lock the push rod to the push rod mounting channel.

4. A screening mesh according to claim 3, characterized in that, The snap-fit ​​structure consists of two rod-shaped structures. Each rod-shaped structure includes two first rods and one second rod. One end of each of the two first rods is positioned on the side of the door panel near the push rod at a preset angle and interval. The other ends of the two first rods are connected through the two ends of the second rod. The two rod-shaped structures are spaced apart at a preset interval on the side of the door panel near the push rod, and the preset interval is smaller than the outer contour dimension of the limiting block.

5. A screening mesh according to claim 1, characterized in that, The discharge port valve is movably connected to the side of the discharge port away from the screen. The discharge port valve includes a door plate and two magnetic devices. The magnetic devices include a first magnetic device and a second magnetic device. The first magnetic device is fixed to the side of the discharge port valve away from the screen. The second magnetic device is set at a preset distance on the side of the discharge port valve away from the screen to change the direction of the current and thus change the magnetic pole of the magnetic device, so that the discharge port has an open or closed state.

6. A screening mesh according to claim 1, characterized in that, The screen and the outer ring of the screen are connected by a sealing ring. A filling layer is provided in the gap between the sealing ring and the screen.

7. A screening mesh according to claim 6, characterized in that, The filler material of the filling layer is an adhesive, and the width of the filling layer is 0.5-10cm.

8. A screening machine, characterized in that, It includes at least two screening screens, a vibration device, a chassis, and a fixing member as described in any one of claims 1-7; the screening screens are stacked to form a stacked structure, and the fixing member is provided between the screening screens to fix adjacent screening screens to each other; The bottom of the stacked structure is provided with the chassis; the chassis is mounted on the vibration device. Each of the screening screens has a different screen aperture, and among all the screening screens, the screen aperture of the screening screen closer to the vibrating device is smaller.

9. A screening machine according to claim 8, characterized in that, The fastener is a circular structure with a notch, and a fastening device is provided at the notch. The fastening device is used to adjust the circumference of the fastener to fit the circumference of the screening screen.

10. A screening machine according to claim 8, characterized in that, The screening machine includes a control device for controlling the vibration duration of the vibrating device and the opening and closing of the discharge valve.

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