CN1139525C

CN1139525C - Integral steel-casting middle groove with loading-unloading connecting pin

Info

Publication number: CN1139525C
Application number: CNB981137997A
Authority: CN
Inventors: 张景辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-27
Filing date: 1998-02-27
Publication date: 2004-02-25
Anticipated expiration: 2018-02-27
Also published as: CN1228383A

Abstract

The present invention relates to an integral steel casting middle groove with a connection pin capable of being assembled and disassembled, which is used on a coal mine underground scraper conveyor. A groove body and a connection pin of the present invention are in a mechanical connection structure, the selection of the material of the groove body depends on the fact that the material is used in a casting state, so enough plasticity and ductility are ensured simultaneously, the strength and the hardness indexes of the groove body are ensured as key points, the groove body made by the integrally casting and shaping technology of the present invention is in accordance with the shape, the dimensional precision and the surface roughness in a middle groove drawing, the casting has no defects, the defect of the sealing-off of a middle groove is eliminated fundamentally, the groove body is friction resistant, the connection pin is breaking resistant and easy to assemble and disassemble, so accidents can be handled conveniently, and the service life of a whole groove can be prolonged by 20 to 50%.

Description

But the integral steel-casting intermediate channel of band loading-unloading connecting pin

The present invention relates to the used intermediate channel of a kind of coal mine lower scraping plate conveyer.

The present used intermediate channel of home and abroad colliery down-hole slat conveyer, adopt stocking (ledge and middle plate) and forging (attachment pegs) welding fabrication, the main drawback of this intermediate channel is not wear-resisting, easily snap, life-span is low, often has an accident during use, must shut down, manually change, the settlement of accident time is long, and labour intensity is big, and coal mining output is low, even the whole middle groove is cancelled in early days, tracing it to its cause, is stocking without heat treatment and welding institute extremely, to this, state such as Britain and Sweden adopts to quench and adds tempered steel (ARQ360 and Hardox) manufacturing intermediate channel in the world, has obtained satisfied effect (" world's colliery engineering " 1991No924-25); State such as the U.S. and Russia adopts the back cover intermediate channel, reduces long-pending coal amount, running resistance and consumption of power (" coal mine machinery " 1985.No3.7) of groove down; Russia adopts the spring steel piston shoes, reduces the intermediate channel wearing and tearing, improves its life-span (" world's colliery engineering " 1991.No11.25); China adopts low-carbon alloy copper and high manganese steel, groove two ends electro-high-frequency hardening (" coal mine machinery " 1985.No2.39-40); Or with rich chromium cast iron built-up welding, plasma welding and oxygen-acetylene welding position easy to wear (" coal mine machinery " 1985.No3.25); Coal distributing machine factory of portion adopts the high network cast iron hyoplastron of welding, recently Inner Mongol coal machine factory casts be in the same place (" coal mine machinery " 1991.No6.11-15) with Zhangjiakou coal machine factory with ledge steel and annex (ramp plate and following of spillplate), data from above relevant documents publication, technology is to the improvement of intermediate channel both at home and abroad, only improving on its resistance to abrasion, and it is still unsatisfactory, take the stocking distortion into account, still avoid heat treatment, ledge and middle plate poor performance as a result, life-span is low, if adopt heat treatment, then increase the main equipment investment, increase orthopedic work capacity and stocking reject rate, and the domestic and international constraint of fundamentally not breaking away from welding fabrication so far, can't overcome a series of disadvantages that the welding of cell body and attachment pegs brings.

The objective of the invention is to, but a kind of integral steel-casting intermediate channel, foundry technique and meticulous selection of band loading-unloading connecting pin are provided, to overcome the wretched insufficiency of prior art.

Cell body and attachment pegs adopt identical material block cast, can only solve the problem of snapping, mechanical characteristics and in-use performance can not be taken into account between the two, consider the resistance to abrasion of cell body, just must hang down the fracture ductility that reduces attachment pegs, want the fracture ductility height of attachment pegs, the intensity of cell body, resistance to abrasion will reduce, make practical life average, not even as existing intermediate channel, even employing composite casting, be subjected to process limitation, anchoring strength is still unreliable under the bad working environments condition, so what the present invention solved emphatically is the intermediate channel selection, the combination of forming technique and attachment pegs and cell body, metallic material heat treatment causes the distortion in various degree of foundry goods or part, consider that intermediate channel does not allow deflection overproof by drawing and operating needs, deflection is overproof must be orthopedic, and increase main equipment and orthopedic work capacity are uneconomic, so the present invention is based on using under the as cast condition to the selection of cell body, must protects its mechanical characteristics simultaneously and (surpass 16Mn, stocking such as 27SIMn and 24Mn2K), in the attachment pegs selection, but heat treatment, when satisfying its intensity and plasticity, emphasis guarantees its fracture ductility, the combination of attachment pegs and cell body adopts mechanical connection.

The present invention can realize with following mode:

But have the integral steel-casting intermediate channel of loading-unloading connecting pin, comprise cell body and attachment pegs, adopt the mechanical connection structure between cell body and the attachment pegs.

But the composition and the foundry technique of the integral steel-casting intermediate channel of band loading-unloading connecting pin, the percentage by weight of its cast steel composition is: C accounts for 0.08-0.45%, Si accounts for 0.2-0.5%, Mn accounts for 0.8-1.8%, P accounts for 0.01-0.04%, S accounts for 0.01-0.04%, Mo accounts for 0.1-0.5%, Ni accounts for 0.3-1.8%, V accounts for 0.05-0.15%, Cr accounts for 0.3-2.2%, Cu accounts for 0.3-0.9%, and Ti accounts for 0.05-0.1%, and Fe accounts for 91.52-97.8%, above-mentioned composition is adapted to each model intermediate channel, because of each model intermediate channel pressure-bearing, situation difference such as withstand shocks differs the first step melting and the cast of foundry technique to the requirement of alloying element, the middle part channel-section steel of the above composition scope of melting, identical with the melting carbon steel and low alloy steel substantially, after the molten bath forms, add the lime slag making of charge amount 1-2% in batches, add small quantities of ore before molten the finishing in batches, quicken dephosphorization, the heat of oxidation, boiling time was no less than 5-15 minute, cleaning molten steel, the oxidation end of term, scratch clean oxidizing slag in the stove, make new slag, oxidation end of term temperature is higher 20 ℃ than tapping temperature, reduction period is made thin slag, basicity of slag is controlled at about R=3, when the molten steel pre-deoxidation is good, can add an amount of ferrosilicon and ferromanganese, adjust molten steel Si, Mn content, when molten steel composition and temperature meet tapping, add 0.10-0.15% aluminium final deoxidizing, tapping temperature is 1650-1670 ℃, the alloy amount is low, can in tapping, be added in the ladle, when the alloy amount is high, before final deoxidizing, be added in the stove in 3-5 minute, agitation as appropriate is treated molten steel calm slightly back cast.Sand casting process is adopted in the casting of second step, adopts the core combination when trial production and small batch production, adopt lost foam casting process during production in enormous quantities, plate bottom surface curved surface somatotype in the edge, or plate vertical center line somatotype in the edge, semiclosed casting system is established bright or blind riser, lays filter when having ready conditions, after the mould assembling, the heavy 153-1000Kg of intermediate channel, be 20-45 second the duration of pouring, unpacks after the temperature of intermediate channel in type is lower than 200 ℃, attachment pegs before dispatching from the factory, air cooling, qualified casting is installed.

The present invention does not exist cell body to snap problem, loaded down with trivial details machine up and welding process before going into the well have been saved, cell body is wear-resistant, attachment pegs does not have and snaps and breakage problem, the continuous Homes Using TV and the coal mining output of slat conveyer have been improved, whole groove practical life can improve 20-50%, and the mechanical connection structure of attachment pegs and cell body is safe and reliable, easy to loading and unloading, be convenient to handle contingent, and fundamentally created alerting ability, overcome the complete block cast of cell body and attachment pegs shortcoming together for cell body and attachment pegs selection, the invention belongs to renewal product, world's initiative, this intermediate channel working condition requires general, and technology is simple, cost is low, have huge economic benefit and social benefit widely, except that yield increase effect, joint money benefit also is very considerable to the colliery.

Fig. 1 is an integral steel-casting intermediate channel scheme drawing.

Fig. 2 is attachment pegs and intermediate channel connecting structure scheme drawing.

Embodiment 1:

Adopt the mechanical connection structure between intermediate channel cell body and the attachment pegs, but 1 is the attachment section of loading-unloading connecting pin among the figure, the 2nd, hyoplastron, the 3rd, attachment pegs, the 4th, ledge, the 5th, middle plate, the 6th, spillplate, the ramp plate connecting device, the 7th, bolt, the 8th, packing ring, the 9th, spring washer, the percentage by weight of the cast steel composition of integral steel-casting intermediate channel, with the 40T intermediate channel is example, C accounts for 0.12%, Si accounts for 0.5%, Mn accounts for 1.3%, P accounts for 0.03%, S accounts for 0.03%, Mo accounts for 0.1%, Ti accounts for 0.08%, V accounts for 0.1%, Cr accounts for 0.3%, Fe accounts for 97.44%, arc melting is used in melting and cast, the cold charge furnace charge, each stages operating of melting is similar with low-alloy steel to general carbon steel, after the molten bath forms, add lime mud, its total addition is the 1-2% of charge amount in batches, melt latter stage, add small quantities of ore in batches, quicken dephosphorization, molten clear back is if the molten steel carbon content is on the low side, allow with broken electrode block carburetting, in time get steel sample analysis after stirring molten steel, should strengthen the molten bath boiling heat of oxidation, boiling time is no less than 5-15 minute, cleaning molten steel, in case of necessity, when molten steel temperature reaches more than 1560 ℃, but oxygen decarburization, oxygen blast pressure is 0.6-0.8MPa, oxygen blow duration was controlled at 3-15 minute, molten steel decarbonization rate per minute 0.01-0.03%, and the oxidation end of term scratches clean oxidizing slag in the stove, make new slag, require oxidation end of term temperature than the high 20-30 of tapping temperature ℃, reduction period is made thin slag, pre-deoxidation, it is proper to make reducing slag deoxidation requirement operation control, basicity of slag is controlled at about R=3, guarantees the molten steel sulphur content, before the aluminium final deoxidizing, the deoxidation situation is judged in sampling, deoxygenation of liquid steel well can add an amount of ferrosilicon and ferromanganese and adjust molten steel Si, and Mn content, ferrochrome and molybdenum-iron are before final deoxidizing in 3-5 minute adding stove, when copper liquid composition meets the requirements and reaches tapping temperature, add 0.10-0.15% aluminium final deoxidizing, requiring tapping temperature is 1650-1670 ℃, in the tapping process, in ladle, add ferrotianium and vanadium iron, and agitation as appropriate, treat the molten steel calmness after, in 1600 ℃ of cast.The second step foundry technique, adopt Integratively casting intermediate channel technology, split moulding two the casees, the sodium silicate sand mold, resin sand core, along in plate bottom surface curved surface somatotype (or along in plate vertical center line somatotype), semiclosed casting system, each several part cross section ratio is that F is straight: in F horizontal stroke: the F=1.0: 1.2: 0.8, along uniform eight ingates of plate end face in the intermediate channel, blind riser or open riser can be set, can lay filter, moulding in the bottom surface of directly detouring when having ready conditions, after coremaking finishes, following core, mould assembling, fastening back upright around, pouring temperature is 1600 ℃, and the heavy 153-1000Kg of intermediate channel is decided to be 20-45 second the duration of pouring, after intermediate channel temperature in type is lower than 200 ℃, unpack, air cooling, the core of Ex-all intermediate channel surfaces externally and internally, molding sand, the gas cutting dead head, do not stay stock left for machining, and polish with emery wheel, obtain block cast intermediate channel finished parts, install attachment pegs before dispatching from the factory, during the block cast intermediate channel, in intermediate channel one end of hyoplastron is arranged, the pit of both sides ledge casts out suitable cavity, during installation, normal orientation by attachment pegs puts it into cavity, will be installed with pad 8 from the other end, the bolt 7 of spring shim 9 inserts cavity through circular hole, bolt 7 is screwed in the screw of attachment pegs, fastening.

Embodiment 2:

Adopt Bolt Connection between cell body and the attachment pegs, its connecting mode is with embodiment 1, the cast steel composition by weight percentage, C accounts for 0.45%, Si accounts for 0.2%, Mn accounts for 1.8%, P accounts for 0.03%, S accounts for 0.03%, Mo accounts for 0.3%, V accounts for 0.15%, Cr accounts for 1.2%, Ti accounts for 0.1%, Fe accounts for 95.74%, melting and cast, with arc furnace or intermediate frequency furnace melting, with the arc melting is example, each stages operating is similar with low-alloy steel to general carbon steel, after the molten bath forms, add the lime slag making in batches, total addition is the 1-2% of charge amount, melt latter stage, add small quantities of ore in batches, quicken dephosphorization, molten clear back is if the molten steel carbon content is on the low side, carburetting is in time got steel sample analysis behind the stirring molten steel, should strengthen the molten bath boiling heat of oxidation, boiling time is no less than 5-15 minute, cleaning molten steel, in case of necessity, when molten steel temperature reaches more than 1560 ℃, but oxygen decarburization, oxygen blast pressure is 0.6-0.8MPa, and oxygen blow duration was controlled at 5-15 minute, and the molten steel decarbonization rate is with per minute 0.01-0.03%, oxidation end of term that is as the criterion scratches clean oxidizing slag in the stove, make new slag, require oxidation end of term temperature than the high 20-30 of tapping temperature ℃, reduction period is made thin slag, pre-deoxidation, it is proper to make reducing slag deoxidation requirement operation control, and basicity of slag is controlled at about R=3, guarantees the molten steel sulphur content, before the aluminium final deoxidizing, the deoxidation situation is judged in sampling, and deoxygenation of liquid steel well can add an amount of ferrosilicon and ferromanganese and adjust molten steel Si, Mn content, ferrochrome, the molybdenum-iron pure nickel, electrolytic copper adds in the stove before final deoxidizing, when the molten steel composition meets the requirements and reaches tapping temperature, add 0.10-0.15% aluminium final deoxidizing, requiring tapping temperature is 1650-1670 ℃, in the tapping process, in ladle, add ferrotianium and vanadium iron, and agitation as appropriate, treat the molten steel calmness after, in 1600 ℃ of cast.Casting: except that attachment pegs, adopt Integratively casting intermediate channel technology, split moulding two the casees, the sodium silicate sand mold, resin sand core, along in plate bottom surface curved surface somatotype (or along in plate vertical center line somatotype), semiclosed casting system, each several part cross section ratio is that F is straight: in F horizontal stroke: the F=1.0: 1.2: 0.8, along uniform eight ingates of plate end face in the intermediate channel, blind riser or open riser can be set, when having ready conditions, filter can be laid in the bottom surface directly detouring, the sodium silicate sand mold: roughing sand requires SiO2 content greater than 97%, silt content is less than 0.5%, the sodium silicate sand mold blows the CO2 sclerosis, and the surface is brushing silica flour coating evenly, coremaking: roughing sand requires SiO2 content greater than 97%, silt content is less than 0.5%, adopt resinoid bond, phosphoric acid hardener, the even brushing silica flour coating in its surface after the coremaking, following core: adopt the fabricate block of two cores once to play core, check core precision down, mould assembling: with the fastening jail of fixing device, stand up after the mould assembling, put pouring basin, to be cast, cast: pouring temperature is 1600 ℃, and molten steel is full of pouring basin, and type is filled in continuous pouring, and guarantee the duration of pouring, cooling: after intermediate channel temperature in type is lower than 200 ℃, unpack, air cooling, cleaning: the core of Ex-all intermediate channel surfaces externally and internally, molding sand, the gas cutting dead head, do not stay stock left for machining, and polish, obtain block cast intermediate channel finished parts with emery wheel, method by embodiment 1 installs attachment pegs then, promptly gets product of the present invention.

Claims

But 1, a kind of integral steel-casting intermediate channel that has loading-unloading connecting pin, it comprises cell body and attachment pegs, it is characterized in that: adopt the mechanical connection structure between cell body and the attachment pegs.
2, but the composition and the foundry technique of the integral steel-casting intermediate channel of band loading-unloading connecting pin according to claim 1, the percentage by weight of its cast steel composition is: C accounts for 0.08-0.45%, Si accounts for 0.2-0.5%, Mn accounts for 0.8-1.8%, P accounts for 0.01-0.04%, S accounts for 0.01-0.04%, Mo accounts for 0.1-0.5%, Ni accounts for 0.3-1.8%, V accounts for 0.05-0.15%, Cr accounts for 0.3-2.2%, Cu accounts for 0.3-0.9%, Ti accounts for 0.05-0.1%, Fe accounts for 91.52-97.8%, and above-mentioned composition is adapted to each model intermediate channel, the first step melting and the cast of foundry technique, the middle part channel-section steel of the above composition scope of melting, identical with the melting carbon steel and low alloy steel substantially, after the molten bath forms, add the lime slag making of charge amount 1-2% in batches, add small quantities of ore before molten the finishing in batches, quicken dephosphorization, the heat of oxidation, boiling time was no less than 5-15 minute, cleaning molten steel, the oxidation end of term, scratch clean oxidizing slag in the stove, make new slag, oxidation end of term temperature is higher 20 ℃ than tapping temperature, reduction period is made thin slag, basicity of slag is controlled at about R=3, when the molten steel pre-deoxidation is good, can add an amount of ferrosilicon and ferromanganese, adjust molten steel Si, Mn content, when molten steel composition and temperature meet tapping, add 0.10-0.15% aluminium final deoxidizing, tapping temperature is 1650-1670 ℃, the alloy amount is low, can in tapping, be added in the ladle, when the alloy amount is high, before final deoxidizing, be added in the stove in 3-5 minute, agitation as appropriate is treated molten steel calm slightly back cast.Sand casting process is adopted in the casting of second step, adopts the core combination when trial production and small batch production, adopt lost foam casting process during production in enormous quantities, plate bottom surface curved surface somatotype in the edge, or plate vertical center line somatotype in the edge, semiclosed casting system is established bright or blind riser, lays filter when having ready conditions, after the mould assembling, the heavy 153-1000Kg of intermediate channel, be 20-45 second the duration of pouring, unpacks after the temperature of intermediate channel in type is lower than 200 ℃, attachment pegs before dispatching from the factory, air cooling, qualified casting is installed.
3, intermediate channel according to claim 1 is characterized in that: by bolted connection, on the cavity that cell body has the ledge pit of hyoplastron one end to cast out a mounting hole is arranged between cell body and the attachment pegs, tapped bore is arranged on the attachment pegs.