CN1059611C

CN1059611C - Cast Mn13 orifice for cylindrical sieve of gold dredger

Info

Publication number: CN1059611C
Application number: CN95119583A
Authority: CN
Inventors: 高谦
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-30
Filing date: 1995-11-30
Publication date: 2000-12-20
Anticipated expiration: 2015-11-30
Also published as: CN1153828A

Abstract

The present invention provides a cast Mn13 screen plate for cylindrical screens of gold dredgers. The raw material of the cast Mn13 screen plate is cast iron, scrap steel, manganese iron or silicon iron; molten steel containing 1 to 15 wt% of C, 11 to 14 wt% of Mn, 0.5 to 1 wt% of Si, lower than 0.05 wt% of S and lower than 0.2 wt% of P is made proportionally. The production technology comprises: the molten steel is poured in a mould made of resin moulding sand and water glass moulding sand, toughened with water and processed in an arc rolling mode so as to obtain the cast Mn13 screen plate. The cast Mn13 screen plate has the advantages of long service life and low price; the present invention can save large quantities of steel and cost for purchasing screen plates and create much benefit for gold mining in gold mines.

Description

The cast Mn 13 orifice for cylindrical sieve of gold dredger casting technique

The present invention relates to a kind of parts of the mechanical device that solid is separated from solid, the casting technique that is specifically related to make cast Mn 13 orifice for cylindrical sieve of gold dredger

At present, gold dust is produced in mechanization in the world, use gold dredger mostly, gold dredger integrates excavation and ore dressing, drum sieve is exactly the visual plant of ore dressing, with the H100 gold dredger is example: its drum sieve is porose to be divided into five sections, sieve plate is divided into Ф 6, Ф 8, Ф 10, Ф 12, Ф 14, Ф 16,20 7 kinds of apertures of Ф, every ship is selected the aperture of sieve plate for use by ore body, ore in sand form enters the drum sieve of rotation from feed end, from first section small-bore, the aperture is increased to the 5th section large aperture gradually, 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 ore separators, greater than the things such as stone of sieve aperture, fall within deliver to ship on the belt conveyor after.At present, China and from the drum sieve sieve plate of Holland, Russian import all is to adopt the 45# carbon steel sheet.Preparation 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, technical process such as heat-treats again and makes.45# carbon steel sieve plate, on cylinder 6 every section, whole drum sieve needs 30, and every sieve plate launches 1384mm * 887mm. weight 125kg, forms cylindrical shape by 6 arcs such as branch such as grade, is welded on the drum sieve 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 drum sieve sieve plate, and this sieve plate uses the Mn13 steel, and by casting technique, rather than the technology manufacturing of boring forms.

Mn13 sieve plate provided by the invention, its raw material are cast iron, steel scrap, ferromanganese, ferrosilicon, make to contain C1-1.5% Mn, 11-14%, Si0.5-1%, S＜0.05%, the molten steel of p＜0.2% (percentage by weight) fusing in proportion.

Mn13 sieve plate provided by the present invention, 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 dormant bolt sieve plate are fixed on the skeleton during installation.

Its casting technique of Mn13 sieve plate provided by the present invention is:

1. preparation mould:

Casting Mn13 sieve plate is to use two sandboxes, two kinds of molding sand, i.e. and nowel water-glass sand type, the top box resin bonded sand mould, two kinds of 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 methenamine of Ji Hua company is a raw material, with sand drier silica sand is heated to more than 140 ℃ earlier, drop in the puddle mixer, when treating silica sand temperature to 130 °-140 ° resin is dropped in the sand in the 4-7% ratio, with the methenamine 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 fixed covers, 8 lifting levers, 9 nuts, 10 screw mandrels, 11 handwheels as shown in Figure 1.Loam cake hot-die machine is that bottom has the square chest on plane 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 technical 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 after 10 a few 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 molding sand of drying in the puddle mixer into, adds low mould waterglass and stirs.

2. with the sieve plate drag box, be fastened on the platform plane of setting, water-glass sand poured in the sandbox, successively add full after, dry up with carbon dioxide gas and to solidify, 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 cope, 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 waterglass 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 put riser sleeve 14.As shown in Figure 3.

2. molten steel casting:

The Mn13 molten steel dissolve good after,, simultaneously from the both sides junner bush molten steel is injected in the sand mold with two steel ladle, make molten steel be full of die cavity and water, rising head.

Undertaken by the aforesaid operations step, can will be covered with φ 8 conical bores (or φ 10-φ 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 dormant bolt 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 heat 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 drum sieve 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 Quenching Treatment reaches specification requirement, 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 Heilungkiang of cold, 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, from gold dredger service test result: this ship of April in this year is installed 1 section Mn13 sieve plate simultaneously, 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 ₁₃When removing 1 installation, just damaged by sieve plate repair welding, 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 use casting Mn13 sieve plates, can save great deal of steel and the fund of purchasing sieve plate, the gold mining that also can be gold mine is created more benefit.

Claims

1. drum sieve is cast M _n13 sieve plate casting techniques,

Casting technique is by the different arc length of various sieve plates, with its five equilibrium 6-10 piece, utilizes sieve plate hot-die machine, makes the resin bonded sand mould in various conical apertures.Drag box is fastened on the end loose tool tool, with tire sand mold at the bottom of the whole sieve plate of water glass type sand rammer system, uses CO ₂After the sclerosis of air-blowing, the resin bonded sand mould block-by-block is placed on the end tire sand mold, iron plate of every sand mold loam cake covers cope again.On four relative ears or side handles of a utensil of upper and lower sandbox, overlap upper clip, on the cope ears or side handles of a utensil and between the clamp, squeeze into wedge, two sandboxes are tightened to one, on sand mold iron covering plate and between the cope crossbeam, tighten with bolt, resin bonded sand mould is fastened at the bottom of the waterglass sand mold on the tire, again whole sand mold is sling tipped upright in melt pit, respectively sit a junner bush in the sand mold both sides, pour into a mould simultaneously with two steel ladle.

It is characterized in that: the tire sand mold can be pounded at any time and be made CO at the bottom of (1) waterglass ₂Hardened forming above resin bonded sand mould is placed in, is formed the sieve plate sand mold at once.Needn't standby more sandbox.(2) with the fastening sandbox of wedge, examine firm sand mold, whole sieve plate sand mold is become one with timber wedge or spiral shell.(3) will make in proportion and contain C1-1.5%, Mn11-14%, Si0.5-1%, S＜0.05%, the molten steel of P＜0.2% (percentage by weight) fusing is poured into a mould.

2. the sieve plate hot-die machine described in the claim 1; The arrangement and the supporting plate of its version conical bore are located in the inner casing, with the metal cylinder in each conical bore of jacking sieve plate mould, avoid cone sand post to fall down from the main body sand mold during sand mold demoulding.

3. sandbox described in the claim 1 and sand mold are fastening.Utilize the fastening sandbox of wedge.Utilize the bolted sand mold.