CN102344188B - Permanent magnet composite filter screen grid - Google Patents

Abstract

The permanent magnet composite filter grid includes a bracket, a permanent magnet grid and a filter screen. The permanent magnet grid and the filter screen are arranged in parallel on the bracket. The permanent magnet grid is composed of permanent magnet filter rods in a side-by-side manner. The distance between the magnet filter rods is 5~15cm, and the filter screen is 20~80 mesh metal mesh or nylon mesh. The permanent magnet filter rods include the outer sleeve and the permanent magnet rods in the inner segments. The permanent magnet rods in each segment are separated by ordinary The steel pipe section is isolated and connected, and the two end faces of the outer casing are respectively closed by iron sheets. When the permanent magnet composite filter grid is inserted into the sewage treatment channel, the screen plane and the grid plane should be inclined at an angle of 75 degrees to the ground. The invention has the advantages of simple structure, easy manufacture, low cost and high processing efficiency.

Description

Permanent magnet compound filter grid

The invention relates to the field of sewage treatment, in particular to a permanent magnet composite filter grid for sewage treatment.

Background technique

Both iron and steel manufacturing and metal material processing industries must derust metal surfaces. Commonly used derusting methods include high-pressure water jet derusting method, sandblasting derusting method, laser derusting method, acid washing degreasing derusting method, alkali degreasing method Rust removal method, heat treatment method, ultrasonic degreasing and rust removal method, etc., regardless of the surface rust removal method, a large amount of impurities such as rust, dust, grease, etc. will be produced. If the waste liquid containing these impurities is not treated, over time, Liquid will stink and turn black. The traditional methods of separating and removing rust impurities include filtration, precipitation, and cyclone separation. Among them, the precipitation method takes a long time, the volume of the precipitation tower is large, and the equipment investment price is high; on the one hand, the filtration method needs to consume a large amount of filter materials. , because the rust particles are relatively small, it is easy to block the filter material, and the replacement frequency of the filter material is high, which indirectly affects the production. On the other hand, equipment such as pipelines, valves, controllers, water pumps or blowers need to be laid, and equipment investment and management costs are relatively large.

The grille is a commonly used device in the sewage treatment process. Its function is to intercept and remove larger solid matter, protect the sewage pump in the subsequent process, and prevent the blockage of the process pipeline. At present, the grids used in water treatment on the market mainly include coarse grids and fine grids of metal mesh. The simple use of grids can only filter out impurities with large particle sizes. Impurities cannot be removed.

Contents of the invention

To solve the above-mentioned problems in the prior art, the applicant provides a permanent magnet composite filter grid, which combines the permanent magnet grid with metal mesh or nylon mesh to filter sewage containing ferromagnetic impurities. The invention has the advantages of simple structure, easy manufacture, low cost and high processing efficiency.

Technical scheme of the present invention is as follows:

The permanent magnet composite filter grid includes a bracket, a filter screen and a permanent magnet grid. The permanent magnet grid and the filter screen are arranged on the support in parallel, wherein the filter screen is arranged on the outside of the bracket, and the permanent magnet grid is arranged on the filter. The inner side of the net; the permanent magnet grid is composed of permanent magnet filter rods arranged side by side on the support; the permanent magnet filter rod includes an outer casing and a segmented permanent magnet rod installed in the outer casing, each section of permanent magnet The rods are isolated and connected by ordinary steel pipe sections, and the two end faces of the outer casing are respectively closed by iron sheets and sealed by sealing rings.

The filter screen is a 20-80 mesh nylon mesh.

The filter screen is a 20-80 mesh metal mesh.

The distance between the permanent magnet filter rods of the permanent magnet grid is 5-15cm.

The outer casing is a stainless steel pipe.

The number of segments of the segmented permanent magnet rods is 4 to 29 segments.

The length of the ordinary steel pipe section is 8-10 mm, and the diameter is 6-30 mm.

The segmented permanent magnet rods are NdFeB permanent magnets respectively, and the NdFeB permanent magnets have a length of 20-100mm and a diameter of 6-30mm.

A suspension ring is welded to one of the closed end faces of the iron sheet of the outer casing of the permanent magnet filter rod.

When the permanent magnet composite filter grid is inserted into the sewage treatment channel, the plane of the filter screen and the plane of the permanent magnet grid are respectively inclined at an angle of 75 degrees to the flow direction of the sewage.

The beneficial technical effects of the present invention are:

(1) The permanent magnet filter rod of the present invention adopts stainless steel pipe as the outer casing for the following reasons: one is because the pH value in the waste liquid or dust changes greatly during the process of metal derusting, especially pickling or alkali cleaning The derusting method will cause serious corrosion to the NdFeB permanent magnet material, so the present invention wraps the permanent magnet in a stainless steel tube to protect the permanent magnet material. Second, due to the relatively strong magnetism of NdFeB permanent magnet materials, as high as 8,000 to 10,000 Gauss, the adsorbed magnetic impurities are difficult to remove. The sleeve-type structural device can adsorb impurities on the outer sleeve, and when the slag needs to be removed , You only need to pull out the stainless steel permanent magnet, and the impurities will be removed quickly after the outer casing loses its magnetism.

(2) The segmented permanent magnet rods of the present invention are connected with iron sheets at both ends of the outer casing to prevent gas explosion and seepage caused by incomplete argon arc welding.

(3) The permanent magnet grid of the present invention can not only use the magnetism of the permanent magnet to absorb the magnetic impurities in the sewage, but also because many impurities such as oil, dust, etc., some have a certain viscosity, and some substances themselves are in the state of negative ions, so The permanent magnet grid can also absorb the above substances.

(4) The filter screen of the present invention can filter non-ferromagnetic impurities, so that most of the impurities with large particles in the sewage are removed by the filter screen first, and then the impurities are intercepted for the second time by the permanent magnet grid.

(5) When the permanent magnet composite filter grid is inserted into the sewage treatment channel, the plane of the filter screen and the plane of the permanent magnet grid are inclined at an angle of 75 degrees to the direction of the sewage flow, so that the impurities filtered out by the filter screen can be eliminated under the impact of the water flow. Sliding down to the bottom of the filter screen is beneficial to clean up impurities.

Description of drawings

Fig. 1 is the front view of the permanent magnet filter rod in the permanent magnet composite filter grid, in the figure: 1, outer casing; 2, permanent magnet rod; 3, ordinary steel pipe; 4, sealing ring; 5, iron sheet.

Fig. 2 is the left view of the permanent magnet filter rod in the permanent magnet composite filter grid, in the figure: 1, outer sleeve; 4, sealing ring; 5, iron sheet.

Fig. 3 is a front view of the permanent magnet composite filter grid. In the figure: 1, the outer casing; 6, the suspension ring; 7, the filter screen; 8, the bracket.

Fig. 4 is a left view of the permanent magnet composite filter grid. In the figure: 1, the outer casing; 6, the suspension ring; 7, the filter screen; 8, the bracket.

Fig. 5 is a top view of the permanent magnet composite filter grid. In the figure: 1. Outer casing; 4. Seal ring; 5. Iron sheet; 6. Hanging ring; 7. Filter screen; 8. Bracket; 9. Bracket hole.

Specific implementation method

As shown in Figures 1 to 5, the permanent magnet composite filter grid includes a bracket 8, a filter screen 7 and a permanent magnet grid, and the permanent magnet grid and the filter screen 7 are arranged in parallel on the bracket 8, and the filter screen 7 is arranged on the On the outside of the support 8, the permanent magnet grid is arranged on the inner side of the filter screen 7; the permanent magnet grid is formed on the support in a side-by-side manner by the permanent magnet filter rod; the permanent magnet filter rod includes an outer sleeve 1 and an installation The segmented permanent magnet rods 2 in the outer casing are isolated and connected by ordinary steel pipe segments 3 between each segment of the permanent magnet rods 2 , and the two end faces of the outer casing 1 are respectively sealed by iron sheets 5 and sealed by sealing rings 4 .

Wherein, the filter screen 7 is a 60-purpose nylon mesh; the spacing between the permanent magnet filter rods of the permanent magnet grid is 8cm; the outer sleeve 1 is a SUS316L stainless steel steel pipe; the segment number of the segmented permanent magnet rod 2 is 10 sections; ordinary steel pipe Section 3 has a length of 10mm and a diameter of 20mm; the segmented permanent magnet rods are respectively NdFeB permanent magnets, and the length of the NdFeB permanent magnets is 30mm and a diameter of 20mm; The closed end face of the piece 5 is welded with a suspension ring 6 .

When in use, when inserting the permanent magnet composite filter grid into the sewage treatment channel, make the side of the filter screen face the direction of water flow, most of the impurities are intercepted by the filter screen, and after passing through the filter screen, the magnetic impurities in the remaining impurities are eliminated. The permanent magnet grid traps, and the filtration efficiency is very high. The plane of the filter screen and the plane of the permanent magnet grille are inclined at an angle of 75 degrees to the sewage flow direction. This setting can make the impurities filtered by the filter screen slide down to the bottom of the filter screen under the impact of the water flow, which is conducive to cleaning up impurities. the

Claims (10)

1. Permanent magnet compound filter grid, it is characterized in that: comprise support, filter screen and permanent magnet grid, described permanent magnet grid and filter screen are arranged on the support in parallel, wherein filter screen is arranged on the outside of support, permanent The magnet grid is arranged on the inner side of the filter screen; the permanent magnet grid is composed of permanent magnet filter rods arranged side by side on the bracket; the permanent magnet filter rod includes an outer sleeve and a segmented permanent magnet installed in the outer sleeve Each segment of the permanent magnet rod is isolated and connected by ordinary steel pipe segments, and the two end faces of the outer casing are respectively closed by iron sheets and sealed by sealing rings. 2. A kind of permanent magnet composite filter grid according to claim 1, characterized in that the filter screen is a 20-80 mesh nylon mesh. 3. A permanent magnet composite filter grid according to claim 1, characterized in that the filter screen is a 20-80 mesh metal mesh. 4. A kind of permanent magnet composite filter grid according to claim 1, characterized in that the spacing between the permanent magnet filter rods of the permanent magnet grid is 5 to 15 cm. 5. A permanent magnet composite filter grid according to claim 1, characterized in that the outer sleeve is a stainless steel pipe. 6. A kind of permanent magnet composite filter grid according to claim 1, characterized in that the number of segments of the segmented permanent magnet rods is 4 to 29 segments. 7. A permanent magnet composite filter grid according to claim 1, characterized in that the length of the ordinary steel pipe section is 8-10mm and the diameter is 6-30mm. 8. A kind of permanent magnet composite filter grid according to claim 6, wherein the permanent magnet bars of the sections are respectively neodymium-iron-boron permanent magnets, and the length of the neodymium-iron-boron permanent magnets is 20 ~ 100mm, diameter 6~30mm. 9. A permanent magnet composite filter grid according to claim 1, characterized in that a suspension ring is welded to one of the closed end faces of the iron sheet of the outer sleeve of the permanent magnet filter rod. 10. A permanent magnet composite filter grid according to claim 1, characterized in that when it is inserted into the sewage treatment channel, the plane of the filter screen and the plane of the permanent magnet grid and the sewage flow direction are respectively inclined at an angle of 75 degrees .

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