CN1153828A

CN1153828A - Cast Mn13 orifice for cylindrical sieve of gold dredger

Info

Publication number: CN1153828A
Application number: CN 95119583
Authority: CN
Inventors: 高谦
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-30
Filing date: 1995-11-30
Publication date: 1997-07-09
Anticipated expiration: 2015-11-30
Also published as: CN1059611C

Abstract

In the production of the cast Mn13 orifice, the material is cast iron, waste steel, ferromanganese or silicon iron, which are produced into molten steel containing in weight percentage: C 1-15%, Mn 11-14%, Si 0.5-1%, S less than 0.05% and P less than 0.2%. The molten steel is cast in sand box of resin sand and water glass sand and the casting is water malleablized and further processed. The orifice product has long service life and low production cost.

Description

Gold dredger trommel screen casting Mn 13Sieve plate

The present invention relates to a kind of parts of the mechanism that solid is separated from solid, be specifically related to a kind of Mn that is installed on the gold dredger ore dressing trommel screen ₁₃Sieve plate.

At present, gold dust is produced in mechanize in the world, use gold dredger mostly, gold dredger integrates excavation and ore dressing, trommel screen is exactly the visual plant of ore dressing, with the H100 gold dredger is example: its trommel screen is porose to be divided into five sections, sieve plate is divided into Φ 6, Φ 8, Φ 10, Φ 12, Φ 14, Φ 16,20 7 kinds of apertures of Φ, every ship is selected the aperture of sieve plate for use by ore body, ore in sand form enters the trommel screen of rotation from feed end, from first section small-bore, the aperture is increased to the 5th section wide aperture by wash rice, passes through high pressure water washing, ore body less than sieve aperture, sand grains and stone etc., from sieve aperture, discharge and fall within on the preparator, greater than the things such as stone of sieve aperture, fall within deliver to ship on the rotary conveyor after.At present, China and carry plate from the trommel screen of Holland, Russian import all is to adopt the 45# carbon steel sheet.Making method is: by the length of sieve plate with widely carry out cutting, choosing is drilled to straight hole, and counterboring becomes inner small and outside big conical bore again, and hole-drilled flat board is rolled into arc, technological process such as heat-treats again and makes.45# carbon steel sieve plate, on cylinder 6 every section, whole he shaft screen needs 30, and every sieve plate launches 1384mm * 887mm, and weight 125kg forms round shape by 6 arcs such as branch such as grade, is welded on the trommel screen skeleton.Carrying and installation is difficulty relatively, and the welding expense of also taking a lot of work is expected.

Purpose of the present invention just is to provide a kind of novel trommel screen sieve plate, and this sieve plate uses Mn ₁₃Steel, and by casting technique, rather than the technology manufacturing of boring forms.

Mn provided by the invention ₁₃Sieve plate, its raw material is cast iron, steel scrap, ferromanganese, ferrosilicon, that makes in proportion contains C1-15%, Mn11-14%, Si0.5-1%, S＜0.05%, the molten steel of p＜0.2% (weight percent) fusing.

Mn provided by the present invention ₁₃Sieve plate, it changes sieve plate length in the past on product structure, get its 1/2, every weight is 63kg, every sieve plate both sides cast out the counter sink of 2 M18 bolts, with countersunk screw sieve plate are fixed on the skeleton during installation.

Mn provided by the present invention ₁₃Its casting technique of sieve plate is:

1. preparation mould:

Casting Mn ₁₃Sieve plate is to use two sandboxes, two kinds of molding sand, i.e. and nowel sodium silicate sand type, the top box resin bonded sand mould, two sand molds have been combined in, and form complete sand mold and pour into a mould.Wherein:

(1) resin bonded sand is the silica sand with the Tongliao, the resin that Changchun two is changed, the urotropine of Ji Hua company is a raw material, with sand drier silica sand is heated to more than 140 ℃ earlier, drop in the sand mill, when treating silica sand temperature to 130 °-140 ° resin is dropped in the sand in the 4-7% ratio, with the urotropine input of 1% dilute with water, after stirring molding sand is released, it is standby to smash dusting cover after the cooling again.

(2) resin bonded sand mould of sieve plate; must make by the hot-die machine; the structure of hot-die machine is made up of parts such as 1 shell, 2 templates, 3 fore-sets, 4 supporting plates, 5 electrothermal tubes, 6 side shields, 7 permanent sleeves, 8 lifting levers, 9 nuts, 10 screw mandrels, 11 handwheels as shown in Figure 1.Loam cake hot-die machine is that bottom has planar square chest two electrothermal tubes 12 of packing into, as shown in Figure 2.

(3) be ready to make behind resin sand and the hot-die machine resin bonded sand mould of sieve plate; its technological process is: the first hot-die machine is led to powers on; the hot-die machine is heated to about 300 °; earlier thin resin sand (70-140 order) is poured on the hot-die type plate; molding sand is filled up in each hole of template; pour crude resin sand (40-70 order) again into, after die cavity is filled up top is wipeed off, in the above loam cake hot-die cover; sand mold solidifies behind 10 several minutes; loam cake hot-die machine is moved away, rotated handwheel 11, supporting plate 4 rises each fore-set 3 jack-up; thereby sand mold also is ejected die cavity; after sand mold is taken away, rotate handwheel 11 and make supporting plate 4 original position that falls back, remake next sand mold.All come out resin bonded sand mould standby with this method.Every sieve plate of H100 gold dredger is with 9 blocks of resin sands, and L150 and every sieve plate of L300 gold dredger are with 7 resin bonded sand moulds.

(4) the glass sand mold is undertaken by following technology:

1. the mixing water glass sand is poured the exsiccant molding sand in the sand mill into, adds low mould water glass and stirs.

2. with the sieve plate flask drag, be fastened on the platform plane of setting, sodium silicate sand is poured in the sandbox, after interpolation successively is full, cut dried solidifying with carbon dioxide gas, the sandbox of moving away, the plane is placed on the ground up.

3. incite somebody to action ready-made resin bonded sand mould in advance, put from the centre to both sides being close together tightly, iron plate on the every resin bonded sand mould upper cover, cover top part, with wedge upper and lower sandbox is tightened together, use bolt (every resin bonded sand mould is with 3) that resin bonded sand mould is fastened on the plane of water glass sand mold then.

4. whole sand mold is sling, is stood in the hole, above two be sidelong junner bush 13, in the middle of going into riser sleeve 14.As shown in Figure 3.

2. molten steel casting:

Mn ₁₃Molten steel dissolve good after,, simultaneously from the both sides junner bush molten steel is injected in the sand mold with two ladle, make molten steel be full of die cavity and water, rising head.

Undertaken by the aforesaid operations step, can will be covered with 8 conical bores (or 10- 20) sieve plate cast form in the middle of the wide 692mm of long 887mm.

After sieve plate is cast, with autogenous cutting will water, rising head slices off, and residual molding sand in the sieve plate conical bore and the countersunk screw hole removed, and with the angle grinding machine burr and the fash of sieve plate removed again, makes the inside and outside plane of whole sieve plate level and smooth, the surrounding does not have burr.

3. water malleableize:

Sieve plate is cleared up, stood on the big pallet, upright 16 sieve plates of pallet by interval 20mm, be lifted on again on the chassis, push in the thermal treatment electric furnace, press the water toughening treatment process and heat up through A, B, three sections (as shown in Figure 4) program energisings of C, heated up 1.5 hours for the first time, heated up 1.5 hours for the second time, heated up for the third time 1 hour, reach the thermostat temperature of coming out of the stove after, chassis is pulled out from electric furnace, rapidly pallet is sling and dropped in the water, the sieve plate after the water patent is about Brinell hardness HB200 degree.

4. volume arc:

Plansifter plate after the water patent is surrounded arc, with homemade screw pressure processing, sieve plate one end is placed below the pressure cross bar, progressively advance by required arc, it is the 864mm arc that H100 gold dredger sieve plate is surrounded the inner arc radius, 150HC gold dredger sieve plate surrounds the arc that the inner arc radius is 1000mm, and it is the arc of 1382mm that 300HS gold dredger sieve plate surrounds to the inner arc radius.

H100 gold dredger trommel screen 45# carbon steel sieve plate is that 30 liner plate of discharge two ends (do not comprise into) gross weights are 3.7 tons, with present calculation of price, be worth 40,000 yuan approximately, if quench treatment reaches technical requirements, promptly the through hardening layer is not less than 3mm, HRC35-45, generally can only use about 6 months, at littoral each gold mine in the cold Heilungkiang of plug, the gold mining phase has only 5-6 month, and the carbon steel sieve plate that has uses less than one-period and just damages, bring to and repair or change, influence the gold mining benefit of gold mine.

Casting Mn13 sieve plate, length are that 1/2, one cover of carbon steel sieve plate is 60,3.8 tons of gross weights, and from gold dredger use-testing result: this ship of April in this year is installed 1 section Mn simultaneously ₁₃Sieve plate, 4 sections 45# carbon steel sieve plates, the carbon steel sieve plate all damaged when October end brought to, and need change next year, and casting Mn ₁₃Just damage repair welding when sieve plate removes 1 installation, all the other 11 still can be continued to use one-period, and more than 100 of the above gold dredger of present national L100 is as whole uses casting Mn ₁₃Sieve plate can be saved great deal of steel and the fund of purchasing sieve plate, and the gold mining that also can be gold mine is created more benefit.

Claims

1, gold dredger trommel screen casting Mn ₁₃Sieve plate, wherein, raw material is cast iron, steel scrap, ferromanganese or ferrosilicon, that makes in proportion contains C1-15%, Mn11-14%, Si0.5-1%, S＜0.05%, the molten steel of p＜0.2% (weight percent) fusing.

2, the described gold dredger trommel screen casting of claim 1 Mn ₁₃Sieve plate, wherein, its production technique for described molten steel casting in the mould that resin bonded sand and sodium silicate sand constitute, again through the water malleableize, roll up arc and can get.