Manufacturing method of special injection molding sash composite metal ultrafiltration screen for solid-liquid separation

Abstract

The invention discloses a manufacturing method of a special injection molding sash composite metal ultrafiltration screen for solid-liquid separation. The manufacturing method comprises the following steps: S1, manufacturing a sash screen frame through an injection molding process; s2, a screen is tensioned through a tensioning device and flatly covers the frame mesh frame; s3, the contact parts of the screen and the frame net rack are compounded through a melting compounding device, so that the screen and the frame net rack are embedded and bonded; according to the invention, the stainless wire mesh is flatly embedded and bonded on the frame mesh frame and each lattice bar through the melting composite device, so that the linear vibrating screen composite frame mesh which is formed by independently fixing the wire mesh on each lattice bar and connecting the frame mesh frame into a whole through injection molding is formed; the horizontal linear vibrating screen composite net is stable in structure, has both steel and flexibility, has good protectiveness to a stainless steel ultrafiltration wire mesh, strong exciting force resistance and good water permeability, has the minimum ultrafiltration aperture of 30 microns, is an excellent solid-liquid ultramicro separation horizontal linear vibrating screen composite net, and is suitable for ultramicro solid-liquid separation.

Description

Technical Field

[0001] The present invention relates to the technical field of screens, in particular to the technical field of special injection-molded frame composite metal ultra-fine screens for solid-liquid separation. Background Art

[0002] Due to the strong exciting force of the linear vibrating screen, the impact force on the screen is large, and the screen is easily damaged. Therefore, at present, the linear vibrating screen is mostly used for the solid-liquid separation of coarse particles, with a larger screen aperture and thicker screen wires, which is not suitable for ultra-fine solid-liquid separation applications.

[0003] In the existing grid frame composite net structure, it is usually manufactured by plastic pouring. The aperture of the mesh is relatively large, and the processing pressure and product density of the pouring method are not as high as those of the injection molding method. The firmness and stability of the product are poor; due to the large grid of the pouring grid frame, when pouring and compounding, two layers or even three layers of stainless steel nets with different wire diameters and apertures are usually stacked together, with the thick one at the bottom and the thin one at the top, and then laminated to the grid frame; the wires and holes of the multi-layer net overlap, blocking a considerable part of the mesh holes, significantly reducing the water permeability and resulting in poor solid-liquid separation effect; in addition, the high-frequency vibration of the vibrating screen causes rapid friction between the two layers of nets, easily leading to damage of the upper fine net and leakage of materials, affecting the separation effect, increasing the number of screen replacements and production costs. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and propose a manufacturing method for a special injection-molded frame composite metal ultra-fine screen for solid-liquid separation, which can solve the above problems.

[0005] To achieve the above purpose, the present invention proposes a manufacturing method for a special injection-molded frame composite metal ultra-fine screen for solid-liquid separation, including the following steps: S1. Manufacture a frame grid by an injection molding process; S2. Tension and flatten the screen on the frame grid through a tensioning device; S3. Composite the part of the screen in contact with the frame grid through a melting composite device, so that the screen and the frame grid are inlaid and bonded.

[0006] Preferably, the frame grid includes an integrally composite border and grid bars, the aperture inside the grid bars is 30-60 mm; the grid bars are composed of several warp and weft grid bars, and the width of the warp and weft grid bars is 6-10 mm; the thickness of the frame grid is 30-50 mm.

[0007] Preferably, the aperture size of the filter holes of the screen is 30-75 μm.

[0008] Preferably, the screen is a metal wire mesh.

[0009] Preferably, the heating temperature of the melting composite device is controlled at 260-320 °C.

[0010] Preferably, a tensioning device is provided around the screen. The tensioning device includes a fixed base, a moving block, and a fixture assembly. The moving block is slidably mounted on the fixed base and is driven to slide by a driving assembly. The moving block is provided with a fixture assembly for clamping the screen.

[0011] Preferably, the melt compounding device includes a longitudinal moving track. A walking bracket is slidably mounted on the longitudinal moving track. A transverse moving track is provided on the walking bracket. A moving bracket is slidably mounted on the transverse moving track. A lifting motor is mounted on the moving bracket. A hot melt head is mounted at the output end of the lifting motor, and a heat source is provided in the hot melt head.

[0012] Preferably, the moving end of the lifting motor is connected to a fixed seat. A steering motor is provided on the fixed seat, and a hot melt head is provided at the output end of the steering motor.

[0013] Advantages of the present invention: By using the melt compounding device, the stainless steel wire mesh is flatly tensioned and inlaid and bonded on the frame grid and each grid bar, forming a linear vibrating screen composite frame grid in which each grid bar independently fixes the stainless steel wire mesh and the injection-molded frame grid is integrated. It has a stable structure, combines steel and flexibility, has good protection for the stainless steel ultrafiltration metal wire mesh, strong anti-vibration force, good water permeability, and the minimum ultrafiltration pore size can reach below 30μm. It is an excellent horizontal linear vibrating screen composite mesh for solid-liquid ultra-fine separation and is suitable for ultra-fine solid-liquid separation. The frame grid with both steel and flexibility is integrally compounded with the fine screen, making the screen more firm and stable, not easily damaged during use, and having the advantages of long service life, good water permeability, convenient replacement, and low cost.

[0014] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the ultrafiltration net of the present invention; Figure 2 is a schematic internal diagram of the ultrafiltration net of the present invention; Figure 3 is a schematic diagram of the melt compounding device of the present invention; Figure 4 is a schematic diagram of the tensioning device of the present invention.

[0016] In the figure: 1, border; 2, grid bar; 3, tensioning device; 31, fixed base; 32, mounting frame; 33, threaded rod; 34, moving block; 35, rotating handle; 36, bottom plate; 37, quick clamp; 38, pressing plate; 4, longitudinal moving track; 41, walking support; 5, transverse moving track; 51, moving support; 6, lifting motor; 7, hot melt head; 8, fixed seat; 9, steering motor. Detailed implementation

[0017] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a manufacturing method for a special injection-molded frame composite metal ultra-fine filter for solid-liquid separation, comprising the following steps: S1. Manufacture a frame grid through an injection molding process; S2. Tension and flatten the screen on the frame grid through the tensioning device 3; The tensioning device 3 is provided around the screen. The tensioning device 3 includes a fixed base 31, a moving block 34 and a fixture assembly. The moving block 34 is slidably mounted on the fixed base 31. The moving block 34 is driven to slide by a driving assembly. The moving block 34 is provided with a fixture assembly for clamping the screen; After the fixture assembly clamps the screen, the moving block is driven to move outwards by the driving assembly to tension the screen; Specifically, the driving assembly includes a threaded rod 33. The fixed base 31 is provided with a mounting frame 32. The threaded rod 33 penetrates horizontally through the mounting frame 32. The mounting frame 32 is provided with a threaded hole. The threaded rod 33 is threadedly mounted with the threaded hole. One side of the threaded rod 33 close to the screen is connected with the moving block 34. One end of the threaded rod 33 far from the screen is connected with a rotating handle 35. The moving block 34 is slidably mounted on the fixed base 31. The fixture assembly includes a bottom plate 36 and a pressing plate 38. One side of the moving block 34 close to the screen is provided with a bottom plate 36. A quick clamp 37 is arranged above the moving block 34. The quick clamp 37 is provided with a pressing head. The pressing head is connected with a pressing plate 38. The pressing plate 38 is located above the bottom plate 36; First, clamp the edge of the screen between the pressing plate and the bottom plate, and then drive the threaded rod to rotate by rotating the handle, so that the threaded rod drives the moving block to move outwards, making the screen in a flat and tensioned state; S3. Composite the part of the screen in contact with the frame grid through a melting composite device, so that the screen and the frame grid are inlaid and bonded.

[0018] The melting and compounding device includes a longitudinal moving track 4, on which a walking bracket 41 is slidably mounted. A transverse moving track 5 is provided on the walking bracket 41, and a moving bracket 51 is slidably mounted on the transverse moving track 5. A lifting motor 6 is installed on the moving bracket 51. The moving end of the lifting motor is connected to a fixed seat 8. A steering motor 9 is provided on the fixed seat 8, and a hot melt head 7 is provided at the output end of the steering motor 9. A heat source is provided in the hot melt head 7.

[0019] Use the melting and pressing device to bond and compound from the middle to the four sides in sequence, with the temperature controlled at 260 - 320 °C. The temperature is related to the fusion speed, and the faster the speed, the higher the required temperature.

[0020] The melting and pressing device is provided with a pressure sensor and a temperature sensor, which send the temperature and pressure to the control center in real time. When bonding and compounding, the compounding speed should be appropriately controlled according to the actual situations such as the ambient temperature, heat source temperature, running speed, and pressure.

[0021] The sieve mesh is selected from 304 or 316 stainless steel plain woven micro sieve meshes with 200 to 400 meshes. When the solid-liquid separation material has special chemical properties, nickel meshes, titanium alloy meshes, etc. can be selected; The pore diameter of the sieve mesh is 30 - 75 μm; Plastic materials with thermoplasticity can all be used for injection molding the frame grid. Different raw materials with different steel flexibilities should be reasonably selected according to the production purpose.

[0022] When making the injection mold, the firmness of the grid and the material cost should be considered. The product structure should be reasonable, taking into account both rigidity and flexibility. The design of the width and thickness of the support grid and the connection grid spacer should be reasonable; the thickness of the support grid bar is the same as that of the grid, which can support the mesh surface without sagging. The connection grid bar is thinner, and it only needs to achieve the function of stable sieve mesh bonding, so as to achieve the firm and stable grid and save the material usage. The frame grid includes an integrally compounded frame 1 and grid bars 2. The inner diameter of the grid bars 2 is 30 - 60 mm; the grid bars 2 are composed of several warp and weft grid bars, and the width of the warp and weft grid bars is 6 - 10 mm; the thickness of the frame grid is 30 - 50 mm; When selecting the frame grid material, PVC and PP are generally selected. When there is a high-temperature requirement, PA can also be selected, or even adding glass fiber, etc.; After the frame grid is injection molded, it needs to be inspected to ensure that the surface is flat, without cracks or protrusions. When necessary, methods such as surface grinding are used for treatment.

[0023] The above embodiments are descriptions of the present invention, not limitations of the present invention. Any scheme obtained by simply transforming the present invention belongs to the protection scope of the present invention.

Claims

1. A manufacturing method of a special injection-molded frame composite metal ultra-fine filter for solid-liquid separation, characterized in that: It includes the following steps: S1. Manufacture a frame grid through an injection molding process; S2. Tighten and flatten the screen on the frame grid through a tensioning device (3); S3. Composite the part where the screen is in contact with the frame grid through a melt composite device, so that the screen and the frame grid are inlaid and bonded.

2. The manufacturing method of the special injection-molded frame composite metal ultra-fine filter for solid-liquid separation according to claim 1, characterized in that: The frame grid includes a border (1) and grid bars (2) that are integrally composite. The aperture inside the grid bars (2) is 30 - 60 mm; the grid bars (2) are composed of a number of warp and weft grid bars, and the width of the warp and weft grid bars is 6 - 10 mm; the thickness of the frame grid is 30 - 50 mm.

3. The manufacturing method of the special injection-molded frame composite metal ultra-fine filter for solid-liquid separation according to claim 1, characterized in that: The aperture size of the filter holes of the screen is 30 - 75 μm.

4. The manufacturing method of the special injection-molded frame composite metal ultra-fine filter for solid-liquid separation according to claim 1, characterized in that: The screen is a wire mesh.

5. The manufacturing method of the special injection-molded frame composite metal ultra-fine filter for solid-liquid separation according to claim 1, characterized in that: The heating temperature of the melt composite device is controlled at 260 - 320 °C.

6. The manufacturing method of the special injection molding frame composite metal ultra - filter screen for solid - liquid separation according to claim 1, characterized in that: Tensioning devices (3) are provided around the screen. The tensioning device (3) includes a fixed base (31), a moving block (34) and a fixture assembly. The moving block (34) is slidably installed on the fixed base (31). The moving block (34) is driven to slide through a driving assembly. A fixture assembly for clamping the screen is provided on the moving block (34).

7. The manufacturing method of the special injection-molded frame composite metal ultra-fine filter for solid-liquid separation according to claim 1, characterized in that: The melt composite device includes a longitudinal moving track (4). A walking bracket (41) is slidably installed on the longitudinal moving track (4). A transverse moving track (5) is provided on the walking bracket (41). A moving bracket (51) is slidably installed on the transverse moving track (5). A lifting motor (6) is installed on the moving bracket (51). The output end of the lifting motor (6) is installed with a hot melt head (7), and a heat source is provided in the hot melt head (7).

8. The manufacturing method of the special injection-molded frame composite metal ultra-fine filter for solid-liquid separation according to claim 7, characterized in that: The moving end of the lifting motor is connected to a fixed seat (8). A steering motor (9) is provided on the fixed seat (8), and a hot melt head (7) is provided at the output end of the steering motor (9).

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