A vibrating screening device for water-based paint production

Abstract

The utility model discloses a vibrating screen device for water -based paint production belongs to paint screening technical field, it includes dust cover, the upper screen frame of successive interlinking, middle screen frame, lower screen frame and upper screen net, lower screen net, feed inlet intercommunication with the feed bin of inclination shunt plate, and shunt plate is equipped with shunt hole, and upper screen net is equipped with radial flow guide rib, and lower screen net is radial corrugated structure, and upper, middle screen frame is equipped with the strip -shaped air hole of the microporous plate, and lower screen frame discharge channel is equipped with two layers of the slow -flow plate of the dislocation rhombus shearing hole in. This device is aimed at the low viscosity water -based paint easy to roll gas, bubble difficult processing's pain point, and the initial gas roll is reduced through the shunt plate dispersion feed, and flow guide rib and corrugated screen net prolong material residence time, and the air hole and microporous plate directional exhaust, and the slow -flow plate breaks the residual bubble, forms " dispersion - flow guide - defoaming - steady flow " closed loop, solves the problem that the low viscosity water -based paint is easy to produce bubble in screening.

Description

Technical Field

[0001] This utility model belongs to the field of coating screening technology, and in particular relates to a vibrating screening device for water-based coating production. Background Technology

[0002] Water-based coatings, such as matte latex paint and water-based wood varnish, are characterized by low viscosity. They have high fluidity and low surface tension, and are extremely sensitive to air bubbles during construction and storage. After the water-based coatings have passed the screening process, they enter the paint mixing process. The air bubbles will further expand during the mixing process. After the coating film dries, the air bubbles will burst, forming pinholes and craters, which will damage the decorative effect.

[0003] Existing technology such as vibrating screens Figure 1 As shown, it includes a base 1, inside which a vibrating motor 2 is installed. Eccentric blocks are connected to both the upper and lower output ends of the vibrating motor 2. A mounting plate 3 is connected to the upper outer ring wall of the vibrating motor 2. The upper end face of the base 1 is connected to the mounting plate 3 via springs 4 spaced circumferentially. A screen mechanism is mounted on the mounting plate 3. This mechanism includes a dust cover 13 with a feed inlet 13-1, below which are stacked an upper screen frame 5, a middle screen frame 6, and a lower screen frame 7 (the lower screen frame 7 is connected to the mounting plate 3). An upper screen 8 and a lower screen 9 (the screens are flat) are respectively provided between the upper screen frame 5 and the middle screen frame 6, and between the middle screen frame 6 and the lower screen frame 7. The side walls of the upper screen frame 5, the middle screen frame 6, and the lower screen frame 7 are respectively provided with discharge channels 14. Driven by the vibration motor 2 and in cooperation with the spring 4, the material is graded and screened, and the stratified discharge of ultra-coarse impurities, medium-sized materials, and qualified undersize materials is achieved. During operation, water-based coatings are poured in through the feed inlet 13-1, and the finished product after being filtered by two layers of flat screens is discharged from the discharge outlet of the lower screen frame 7.

[0004] Existing vibrating screens generate a large number of air bubbles during water-based coating processing for the following reasons:

[0005] Firstly, when the low-viscosity water-based coating enters from the feed inlet 13-1, it forms a jet. The jet directly impacts the central area of ​​the upper screen 8 on the upper plane. This single-point concentrated impact causes the coating to splash in all directions, mix violently with the air, and instantly engulf a large number of air bubbles. The low surface tension of the water-based coating itself significantly improves the stability of the bubble film, making it difficult for it to break naturally.

[0006] Secondly, both the upper screen 8 and the lower screen 9 are planar structures. The low-viscosity coating flows at an extremely fast speed under vibration, and the air bubbles pass through quickly with the material flow, lacking sufficient residence time to be broken by the vibration energy.

[0007] Third, a relatively closed cavity is formed inside the screen frame (including the space between the upper screen 8 and the dust cover 13, and the interlayer between the upper screen 8 and the lower screen 9). Due to their low density, the air bubbles in the low viscosity coating will rise and gather. These air bubbles cannot be discharged from the discharge channel 14 with the material. Instead, they will be 'broken' into microbubbles by vibration and re-mixed into the material, forming 'secondary pollution'.

[0008] Fourth, the discharge channel 14 on the side wall of the lower screen frame 7 adopts an internally smooth straight cylinder / right angle structure. When low viscosity water-based coatings are discharged, they are prone to turbulence due to sudden changes in flow rate (such as at right angle turns). This not only draws in new air, but also stretches and expands existing microbubbles, further aggravating the bubble problem. Utility Model Content

[0009] To address the aforementioned problems, the purpose of this invention is to provide a vibrating screening device for the production of water-based coatings, thereby solving the problem of air bubbles easily generated in the screening process of low-viscosity water-based coatings.

[0010] The technical solution of this utility model is as follows:

[0011] A vibrating screening device for water-based coating production includes a dust cover with a feed inlet. Below the dust cover, an upper screen frame, a middle screen frame, and a lower screen frame are stacked sequentially. An upper screen mesh and a lower screen mesh are respectively provided between the upper and middle screen frames, and between the middle and lower screen frames. The feed inlet connects to a cylindrical feed hopper, which contains an inclined flow divider plate with flow divider holes spaced apart. The upper screen mesh has uniformly distributed guide ribs along its circumferential direction on its end face, and the lower screen mesh is a radially corrugated screen mesh.

[0012] The upper and middle screen frames are symmetrically provided with strip-shaped ventilation holes on their side walls, and microporous plates are provided inside the strip-shaped ventilation holes; the lower screen frame is provided with a discharge channel on its side wall, and two layers of spaced-apart flow buffers are provided on the inner wall of the inlet end of the discharge channel. The flow buffers are provided with shearing holes spaced apart. The shearing holes are diamond-shaped, and the diamond-shaped holes of the two layers of flow buffers are staggered.

[0013] The overall design revolves around the characteristics of low-viscosity water-based coatings, constructing an adaptive system of "dispersion-guidance-defoaming-stabilization". The flow divider plate in the feed hopper, with its inclined setting and flow divider holes, transforms the concentrated feed into a dispersed flow, reducing air entrapment caused by the initial impact. The guide ribs on the upper screen guide the material to flow radially, avoiding central accumulation, while the radial corrugations on the lower screen promote the material to form a spiral propulsion flow, extending the screening path. The strip-shaped vent holes in the upper and middle screen frames, combined with microporous plates, can discharge air bubbles. The two-layer flow buffer plate in the discharge channel, with its staggered diamond-shaped shear holes, finally breaks up any remaining microbubbles, ensuring the stability of subsequent processes.

[0014] Furthermore, the diversion plate has four connecting posts evenly distributed along its circumferential edge, and the inner ring wall of the feed hopper has vertical mounting grooves that mate with the connecting posts. The depth of the vertical mounting grooves decreases from the top of the feed hopper downwards, so that the angle between the diversion plate and the horizontal plane is 30° after installation. During installation, the connecting posts of the diversion plate are first aligned with the vertical mounting grooves on the inner ring wall of the feed hopper, and then installed from top to bottom. The diversion holes include multiple evenly distributed circular diversion holes and irregularly shaped anti-clogging holes on the edge of the diversion plate to prevent material accumulation.

[0015] Furthermore, the guide ribs consist of six evenly distributed ribs at 60° intervals. The guide ribs extend radially along the upper screen, with their outer ends extending to the edge of the upper screen frame and their inner ends terminating outside a circular area with the same diameter as the feed inlet, forcing the material to be buffered from the center and evenly dispersed radially. The guide ribs are welded to the end face of the upper screen, and the upper end face of the guide ribs is provided with a toothed groove group. The toothed groove group includes multiple toothed grooves evenly spaced along the length direction of the guide ribs. The toothed grooves are perpendicular to the length direction of the guide ribs and have a trapezoidal cross-section. Because the concave and convex contours of the toothed grooves intersect with the material flow path, they can generate regular disturbances to the low-viscosity coating, forming continuous micro-turbulence—utilizing turbulent shear force to efficiently break up 0.1-0.3mm microbubbles (bubbles of this size are easily left behind with the low-viscosity coating, and are difficult to handle with smooth guide ribs).

[0016] Furthermore, the lower screen is connected to a screen mounting ring on its outer periphery. Four screen connecting posts are evenly distributed on the circumferential edge of the lower screen. The ring wall of the mounting ring has an L-shaped mounting groove that mates with the screen connecting posts. The vertical section of the L-shaped mounting groove opens upwards. During installation, the screen connecting posts enter from the vertical opening of the L-shaped mounting groove and are rotated at a certain angle to the horizontal section of the L-shaped mounting groove to complete the assembly.

[0017] Furthermore, a silicone sealing ring is connected to the outer periphery of the microporous plate, and connecting walls are symmetrically arranged on the microporous plate. The connecting walls are respectively installed on the outer walls of the upper screen frame and the middle screen frame by fasteners. On the outer walls of the upper screen frame and the middle screen frame, a receiving hopper is provided below the strip-shaped vent hole. The opening of the receiving hopper faces the strip-shaped vent hole. An L-shaped connecting plate is provided at one end of the receiving hopper near the strip-shaped vent hole. The horizontal section of the L-shaped connecting plate is connected to the receiving hopper. The outer walls of the upper screen frame and the middle screen frame are respectively provided with inserts that cooperate with the L-shaped connecting plate. The vertical section of the L-shaped connecting plate is inserted into the inserts.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model uses a 30° inclined diversion plate and multiple diversion holes (including edge irregular anti-clogging holes) in the feed hopper to transform the "single-point impact flow" of centralized feeding into a "multi-point dispersed flow", which avoids the low viscosity coating from splashing and entanglement of air due to single-point impact, reduces the initial bubble generation from the source, and solves the problem of "large instantaneous air entrainment" caused by the central impact of traditional flat screens.

[0020] 2. The six radial guide ribs of the upper screen of this utility model force the material to be radially dispersed from the center to the edge (with a buffer ring at the inner end to avoid direct impact). Combined with the radial corrugated structure of the lower screen, it forms a "spiral propulsion flow", which significantly extends the material screening path and residence time, allowing sufficient time for bubbles to be broken by the vibration energy and the micro-turbulence of the guide rib grooves, thus solving the problem of "fast material flow and difficulty in handling bubbles" in traditional planar screens.

[0021] 3. The symmetrically arranged strip-shaped ventilation holes on the upper and middle screen frames of this utility model, combined with the microporous plate, can discharge the air bubbles that accumulate during the screening process. The ventilation characteristics of the microporous plate allow the gas to escape, and the silicone sealing ring reduces the overflow of the coating. At the same time, the material receiving hopper below recovers the slight leakage, preventing the air bubbles from being "crushed" by vibration in the closed space and causing secondary pollution, thus solving the problem of "air bubble accumulation and residue" caused by the traditional sealed screen frame.

[0022] 4. The discharge channel of this utility model has two layers of flow-retarding plates with staggered diamond-shaped shearing holes. The shearing effect of the diamond-shaped holes breaks up residual micro-bubbles. The staggered layout and spacing design reduce material flow rate fluctuations and avoid the "new air entrapment" and "bubble expansion" caused by turbulence in traditional straight / right-angle channels. This achieves stable discharge flow while completing the final defoaming. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an existing vibrating screen structure.

[0024] Figure 2 This is a schematic diagram of the structure of this utility model.

[0025] Figure 3 This is a schematic diagram showing the breakdown of the feed hopper.

[0026] Figure 4 This is a schematic diagram showing the disassembled strip-shaped air vent, micro-perforated plate, and receiving hopper of this utility model.

[0027] Figure 5 This is a schematic diagram of the upper screen structure of this utility model.

[0028] Figure 6 This is a schematic diagram of the installation of the lower screen and mounting ring of this utility model.

[0029] Figure 7 This utility model Figure 5 A magnified structural diagram of part A.

[0030] Figure 8 This is a schematic diagram of the installation of the flow-damping plate of this utility model.

[0031] Reference numerals: 1. Base; 2. Vibrating motor; 3. Mounting plate; 4. Spring; 5. Upper screen frame; 5-1. Insert block; 6. Middle screen frame; 6-1. Strip-shaped vent hole; 6-1.1. Micro-perforated plate; 6-1.1.1. Connecting wall; 7. Lower screen frame; 8. Upper screen; 8-1. Guide rib; 8-1.1. Toothed groove; 9. Lower screen; 9-1. Screen connecting column; 10. Mounting ring; 10-1. L-shaped mounting groove; 11. Feed hopper; 11-1. Diverter plate; 11-1.1. Connecting column; 11-2. Vertical mounting groove; 12. Receiving hopper; 12-1. L-shaped connecting plate; 13. Dust cover; 13-1. Feed inlet; 14. Discharge channel; 15. Flow buffer plate; 15-1. Diamond-shaped hole; 15-2. Mounting wall; 16. Silicone sealing ring. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0033] like Figures 1 to 8 As shown, a vibrating sieving device for water-based coating production includes a dust cover 13 with a feed inlet 13-1. Below the dust cover 13, an upper screen frame 5, a middle screen frame 6, and a lower screen frame 7 are stacked sequentially. An upper screen 8 and a lower screen 9 are respectively provided between the upper screen frame 5 and the middle screen frame 6, and between the middle screen frame 6 and the lower screen frame 7. Mounting rings 10 are connected to the outer periphery of both the upper screen 8 and the lower screen 9. After the mounting rings 10 overlap the screen frames, the upper screen frame 5, the middle screen frame 6, the lower screen frame 7, and the upper screen 8 and lower screen 9 are secured by fastening rings. The upper screen 8 is fixed separately. The upper screen 8 is an inverted barrel. The barrel wall covers the mounting ring 10. The outer wall of the upper screen 8 is then tightly fixed to the mounting ring 10 by fastening the fastening ring. The feed inlet 13-1 is connected to the cylindrical feed hopper 11. The feed hopper 11 is connected to the dust cover 13 by bolts. The feed hopper 11 is provided with an inclined diversion plate 11-1. The diversion plate 11-1 has diversion holes distributed at intervals. The end face of the upper screen 8 is provided with evenly distributed guide ribs 8-1 along the circumference. The lower screen 9 is a radial corrugated screen.

[0034] The upper screen frame 5 and the middle screen frame 6 are symmetrically provided with strip-shaped ventilation holes 6-1 on their side walls, and microporous plates 6-1.1 are provided inside the strip-shaped ventilation holes 6-1; the lower screen frame 7 is provided with a discharge channel 14 on its side wall, and two layers of spaced-apart flow buffers 15 are provided on the inner wall of the inlet end of the discharge channel 14. One end of the flow buffer 15 extends to an installation wall 15-2, which is connected to the discharge channel 14 by screws. The flow buffer 15 is provided with shearing holes at intervals. The shearing holes are diamond-shaped, and the diamond-shaped holes 15-1 of the two layers of flow buffer 15 are staggered.

[0035] The overall design revolves around the characteristics of low-viscosity water-based coatings, constructing an adaptive system of "dispersion-guidance-defoaming-stabilization". The diversion plate 11-1 of the feed hopper 11, with its inclined setting and diversion holes, transforms the concentrated feed into a dispersed flow, reducing air entrapment caused by the initial impact. The guide ribs 8-1 of the upper screen 8 guide the material to flow radially, avoiding central accumulation. The radial corrugations of the lower screen 9 promote the material to form a spiral propulsion flow, extending the screening path. The strip-shaped vent holes 6-1 of the upper and middle screen frames are respectively matched with microporous plates 6-1.1, which can discharge air bubbles while minimizing coating overflow. The two-layer flow-retardant plates 15 of the discharge channel 14, with their staggered diamond-shaped shear holes 15-1, finally break up the remaining microbubbles, ensuring the stability of subsequent processes.

[0036] Furthermore, the diversion plate 11-1 has four connecting posts 11-1.1 evenly distributed along its circumferential edge. The inner ring wall of the feed hopper 11 has a vertical mounting groove 11-2 that mates with the connecting posts 11-1.1. The depth of the vertical mounting groove 11-2 decreases downward from the top of the feed hopper 11, so that the angle between the diversion plate 11-1 and the horizontal plane is 30° after installation. During installation, the connecting posts 11-1.1 of the diversion plate 11-1 are first aligned with the vertical mounting groove 11-2 on the inner ring wall of the feed hopper 11, and then installed from top to bottom. The diversion holes include multiple evenly distributed circular diversion holes and irregularly shaped anti-clogging holes on the edge of the diversion plate 11-1 to prevent material accumulation.

[0037] Furthermore, the guide ribs 8-1 consist of six guide ribs 8-1 evenly distributed at 60°. The guide ribs 8-1 extend radially along the upper screen 8, with the outer ends of the guide ribs 8-1 extending to the edge of the upper screen frame 5, and the inner ends terminating outside a circular area with the same diameter as the feed inlet 13-1, forcing the material to be buffered from the center and evenly dispersed radially. The upper surface of the guide ribs 8-1 is provided with a toothed groove group, which includes multiple toothed grooves 8-1.1 evenly spaced along the length of the guide ribs 8-1.1. The toothed grooves 8-1.1 are perpendicular to the length of the guide ribs 8-1.1 and have a trapezoidal cross section. Due to the interlacing of the concave and convex contours of the toothed grooves 8-1.1 with the material flow path, they can generate regular disturbances to the low-viscosity coating, forming continuous micro-turbulence—utilizing turbulent shear force to efficiently break up 0.1-0.3mm microbubbles (bubbles of this size are easily left behind with the low-viscosity coating, and are difficult to handle with smooth guide ribs).

[0038] Furthermore, the lower screen 9 has perforations, and the inner circumference of the lower screen 9 has a circular area with the same diameter as the feed inlet 13-1. The outer circumference of the lower screen 9 is connected to the screen mounting ring 10. Four screen connecting posts 9-1 are evenly distributed around the lower screen 9. The connecting posts are welded to the end face of the lower screen 9. The ring wall of the mounting ring 10 has an L-shaped mounting groove 10-1 that mates with the screen connecting posts 9-1. The vertical section of the L-shaped mounting groove 10-1 opens upwards. During installation, the screen connecting posts 9-1 all enter from the vertical opening of the L-shaped mounting groove 10-1 and are rotated at a certain angle to the horizontal section of the L-shaped mounting groove 10-1 to complete the assembly.

[0039] Furthermore, a silicone sealing ring 16 is fitted around the outer periphery of the microporous plate 6-1.1. Symmetrically arranged connecting walls 6-1.1.1 are provided on the microporous plate 6-1.1. The connecting walls 6-1.1.1 are respectively installed on the outer walls of the upper screen frame 5 and the middle screen frame 6 by screws. A receiving hopper 12 is provided below the strip-shaped vent hole 6-1 on the outer walls of the upper screen frame 5 and the middle screen frame 6 to receive the paint that may leak out from the microporous plate 6-1.1 in the initial stage of paint pouring. The opening of the receiving hopper 12 faces the strip-shaped vent hole 6-1. An L-shaped connecting plate 12-1 is provided at one end of the receiving hopper 12 near the strip-shaped vent hole 6-1. The horizontal section of the L-shaped connecting plate 12-1 is connected to the receiving hopper 12. Insert blocks 5-1 that cooperate with the L-shaped connecting plate 12-1 are respectively provided on the outer walls of the upper screen frame 5 and the middle screen frame 6. The vertical section of the L-shaped connecting plate 12-1 is inserted into the insert block 5-1.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A vibrating sieving device for water-based coating production, comprising a dust cover with a feed inlet, and an upper screen frame, a middle screen frame, and a lower screen frame stacked sequentially below the dust cover, wherein an upper screen mesh and a lower screen mesh are respectively provided between the upper screen frame and the middle screen frame, and between the middle screen frame and the lower screen frame, characterized in that, The feed inlet is connected to a cylindrical feed hopper, and the feed hopper is equipped with an inclined diversion plate with diversion holes spaced apart on the diversion plate. The upper screen end face is provided with uniformly distributed guide ribs along the circumference, and the lower screen is a radially corrugated screen. The upper and middle sieve frames are symmetrically provided with strip-shaped air vents on their side walls, and microporous plates are provided inside the strip-shaped air vents. The lower screen frame has a discharge channel on its side wall. The inner wall of the discharge channel inlet end is provided with two layers of spaced-apart flow buffers, and the flow buffers are provided with shearing holes at intervals.

2. The vibrating screening device for water-based coating production according to claim 1, characterized in that, The diversion plate has four connecting posts evenly distributed around its circumferential edge. The inner ring wall of the feed hopper has a vertical mounting groove that mates with the connecting posts. The depth of the vertical mounting groove decreases from the top of the feed hopper downwards, so that the angle between the diversion plate and the horizontal plane is 30° after installation. The diversion holes include multiple evenly distributed circular diversion holes on the diversion plate and irregularly shaped anti-clogging holes on the edge.

3. The vibrating screening device for water-based coating production according to claim 1, characterized in that, There are 6 guide ribs, which extend radially along the upper screen. The outer ends of the guide ribs all extend to the edge of the upper screen frame, and the inner ends terminate outside a circular area with the same diameter as the feed inlet.

4. The vibrating screening device for water-based coating production according to claim 3, characterized in that, The upper surface of the guide rib is provided with a tooth groove group, which includes multiple tooth grooves evenly spaced along the length direction of the guide rib. The tooth grooves are perpendicular to the length direction of the guide rib and have a trapezoidal cross section.

5. A vibrating screening device for water-based coating production according to claim 1, characterized in that, The lower screen is connected to a screen mounting ring on its outer periphery. Four screen connecting posts are evenly distributed along the circumferential edge of the lower screen. The ring wall of the mounting ring has an L-shaped mounting groove that mates with the screen connecting posts. The vertical section of the L-shaped mounting groove opens upwards.

6. The vibrating screening device for water-based coating production according to claim 1, characterized in that, The microporous plate is connected to a silicone sealing ring on its outer periphery, and connecting walls are symmetrically arranged on the microporous plate. The connecting walls are respectively installed on the outer walls of the upper screen frame and the middle screen frame by fasteners.

7. The vibrating screening device for water-based coating production according to claim 1, characterized in that, On the outer walls of the upper and middle screen frames, a receiving hopper is provided below the strip-shaped ventilation hole. The opening of the receiving hopper faces the strip-shaped ventilation hole. An L-shaped connecting plate is provided at one end of the receiving hopper near the strip-shaped ventilation hole. The horizontal section of the L-shaped connecting plate is connected to the receiving hopper. The outer walls of the upper and middle screen frames are respectively provided with inserts that cooperate with the L-shaped connecting plate. The vertical section of the L-shaped connecting plate is inserted into the insert.

8. A vibrating screening device for water-based coating production according to claim 1, characterized in that, The shear holes are rhomboid in shape, and the rhomboid holes in the two layers of the flow-retardant plates are staggered.

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