{"id":1700,"date":"2026-05-22T02:25:39","date_gmt":"2026-05-22T02:25:39","guid":{"rendered":"https:\/\/chinawormgearbox.xyz\/application\/worm-gearbox-for-screw-conveyors\/"},"modified":"2026-05-22T02:25:39","modified_gmt":"2026-05-22T02:25:39","slug":"worm-gearbox-for-screw-conveyors","status":"publish","type":"post","link":"https:\/\/chinawormgearbox.xyz\/pt\/application\/worm-gearbox-for-screw-conveyors\/","title":{"rendered":"Caixa de engrenagens sem-fim para transportadores helicoidais"},"content":{"rendered":"

Worm Gearbox for Screw Conveyors \u2014 Sealed Power for Powder & Bulk Solids Handling<\/h2>\n

Screw conveyors \u2014 also known as auger conveyors or helical screw feeders \u2014 are the go-to solution for moving powders, granules, cement, grain, fertiliser, and other bulk solids through enclosed troughs or pipes. The caixa de engrenagens sem-fim<\/strong> driving the screw shaft must provide two things above all else: high torque at low speed<\/strong> and near-perfect sealing<\/strong> against the very material being conveyed. A single gram of cement or talc entering the gearbox housing accelerates wear dramatically. Our worm gear reducers<\/a> are configured with flange-direct mounting to the screw trough end-plate, aligning worm output shaft directly with the screw shaft \u2014 eliminating any shaft gap where powder can accumulate.<\/p>\n

\n
\n

\u2699\ufe0f Primary Function<\/h3>\n

Rotate screw helix at 30\u2013120 rpm to propel bulk material axially through a sealed trough. Motor speed (1 400 rpm typical) reduced in a single worm stage \u2014 no need for secondary reduction.<\/p>\n<\/p><\/div>\n

\n

Critical Requirement<\/h3>\n

Flange-direct connection provides full mechanical seal between gearbox and trough \u2014 eliminating exposed shaft length where powder would collect, cake, and migrate into bearings.<\/p>\n<\/p><\/div>\n<\/div>\n

\"flange-mounted<\/p>\n

Screw Conveyor Design & Worm Drive Integration Details<\/h2>\n

A screw conveyor trough section terminates at a bearing-and-seal end plate. The worm gear drive<\/strong> is bolted directly to this plate via a machined register spigot (IEC B5 flange or custom machined bolt circle). The output shaft of the worm reducer couples to the screw shaft via a key and set-screw, often supplemented by a rigid half-coupling for ease of disassembly.<\/p>\n

Key technical considerations unique to screw conveyor duty:<\/p>\n

    \n
  1. Axial (thrust) loading<\/strong> \u2014 the conveyed material exerts a reaction force on the screw helix that transmits as axial load to the output shaft. Our worm gearboxes use taper-roller bearings on the output side to handle combined radial and axial loads without premature bearing fatigue.<\/li>\n
  2. Overload at start-up<\/strong> \u2014 compacted or bridged material in the trough creates a locked-rotor condition at start. Worm reducers with self-locking geometry (ratio \u2265 30:1) provide built-in break-out torque resistance; specify SF 2.0 for this scenario.<\/li>\n
  3. Seal configuration<\/strong> \u2014 dual-lip seal + labyrinth groove on the output shaft extension into the trough prevents powder ingress regardless of trough pressure differentials. IP65 rated minimum; IP66 for pressurised pneumatic conveying.<\/li>\n
  4. Material contact zone<\/strong> \u2014 the shaft stub inside the trough should be stainless steel (AISI 304 or 316) for food, pharmaceutical, or corrosive material applications.<\/li>\n<\/ol>\n

    Worm Gearbox Technical Specifications for Screw Conveyors<\/h2>\n
    \n\n\n\n\n\n\n\n\n\n\n\n
    Parameter<\/th>\nAvailable Range<\/th>\nTypical Screw Conv. Selection<\/th>\n<\/tr>\n<\/thead>\n
    Gear Ratio<\/td>\n5:1 \u2013 100:1<\/td>\n15:1 \u2013 50:1 (screw 30\u201390 rpm)<\/td>\n<\/tr>\n
    Output Torque<\/td>\n10 \u2013 4 500 N\u00b7m<\/td>\n50 \u2013 800 N\u00b7m depending on screw diameter<\/td>\n<\/tr>\n
    Flange Type<\/td>\nB5 (face flange) \/ B14 (small flange)<\/td>\nB5 flange preferred<\/strong> for direct trough mounting<\/td>\n<\/tr>\n
    Output Shaft Bearing<\/td>\nDeep-groove or Taper-roller<\/td>\nTaper-roller \u2014 handles axial thrust load<\/td>\n<\/tr>\n
    Shaft Material<\/td>\n45# steel or SS 304<\/td>\nSS 304 for food \/ pharma duty<\/td>\n<\/tr>\n
    Housing<\/td>\nAluminium alloy \/ Grey cast iron<\/td>\nCast iron for continuous operation<\/td>\n<\/tr>\n
    IP Rating<\/td>\nIP65 \/ IP66<\/strong><\/td>\nIP65 minimum<\/strong>; IP66 for pressurised conveying<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Selection by Conveyed Material<\/h3>\n

    Apply an environmental\/material correction to the service factor: abrasive materials (cement, silica sand) add +0.5 to SF; sticky materials (wet clay, moist grain) add +0.25; corrosive vapours present \u2014 upgrade to IP66 and request epoxy-coated housing. Contact the engineering team<\/a> with your material bulk density and moisture content for a tailored recommendation.<\/p>\n

    \"CNC<\/p>\n

    Quality Certifications & Standards<\/h2>\n

    Our screw conveyor worm gearboxes are produced under strict quality management:<\/p>\n

    \n
    \u2705 ISO 9001:2015 Certified<\/div>\n
    \u2705 CE Marked (2006\/42\/EC)<\/div>\n
    \u2705 IEC B5\/B14 Motor Flange<\/strong><\/div>\n
    \u2705 IP65 \/ IP66 Rated<\/strong><\/div>\n
    \u2705 Material Test Certs (worm wheel bronze)<\/div>\n<\/div>\n

    Five Screw Conveyor Case Studies<\/h2>\n\n\n\n\n\n\n\n\n\n
    #<\/th>\nIndustry \/ Application<\/th>\nCustomer Challenge<\/th>\nSolution & Result<\/th>\n<\/tr>\n<\/thead>\n
    1<\/td>\nCement Plant<\/strong>
    Fly ash dosing screw<\/td>\n    		Ash penetrated the reducer housing within 2 months; two seal replacements per quarter.<\/td>\nFlange-mount worm reducer, IP66, labyrinth + V-ring seal stack. Seal interval extended to >18 months.<\/td>\n<\/tr>\n
    2<\/td>\nFlour Mill<\/strong>
    Flour transfer auger<\/td>\n    		Product contamination concern; existing reducer used non-food-grade oil causing compliance issues.<\/td>\nStainless steel shaft, H1 food-grade lubricant, IP65 sealed. Passed FDA facility audit without remarks.<\/td>\n<\/tr>\n
    3<\/td>\nFertiliser Plant<\/strong>
    Granule metering screw<\/td>\n    		Ammonium nitrate fumes corroding housing; replacement every 6 months.<\/td>\nEpoxy-coated cast iron housing, stainless shaft stub, IP66. First corrosion inspection clear at 30 months.<\/td>\n<\/tr>\n
    4<\/td>\nPlastic Extrusion<\/strong>
    Resin pellet feeder<\/td>\n    		Static charge on pellets caused intermittent position errors; required electrically grounded drive.<\/td>\nWorm reducer with earthing lug on housing; electrostatic discharge path confirmed with continuity test.<\/td>\n<\/tr>\n
    5<\/td>\nMining<\/strong>
    Underground coal screw feeder<\/td>\n    		ATEX zone requirement; no certified gearbox available locally at acceptable price.<\/td>\nATEX II 2G Ex IIB T4 worm reducer supplied from our OEM partner range; ATEX documentation package included. Passed inspection first attempt.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Why Choose Our Worm Reducers?<\/h2>\n
    \n
    \n <\/span><\/p>\n
    Fabrica\u00e7\u00e3o verticalmente integrada<\/strong><\/p>\n

    We cast the bronze worm wheels, machine the housings, and assemble under one roof \u2014 full traceability, zero outsourcing risk.<\/p>\n<\/div><\/div>\n

    \n <\/span><\/p>\n
    OEM Flange Engineering<\/strong><\/p>\n

    Custom flange bolt circles, register diameters, and keyway positions machined to your trough drawing \u2014 no adaptor plates needed.<\/p>\n<\/div><\/div>\n

    \n <\/span><\/p>\n
    Global Technical Support<\/strong><\/p>\n

    Engineering consultations available by video call across all time zones \u2014 share your AutoCAD trough drawing and we’ll design the interface.<\/p>\n<\/div><\/div>\n

    \n <\/span><\/p>\n
    Volume Pricing<\/strong><\/p>\n

    MOQ from 1 unit for prototype \u2014 tiered pricing for 10, 50, 200+ unit orders. Cost-per-unit drops 20\u201335 % at batch production volumes.<\/p>\n<\/div><\/div>\n<\/div>\n

    Frequently Asked Questions<\/h2>\n
    \nWhat output torque do I need for a 250 mm diameter screw conveyor moving cement at 80 rpm?<\/summary>\n

    For a 250 mm screw handling cement (bulk density ~1 500 kg\/m\u00b3) at 80 rpm, a rule-of-thumb torque estimate is 180\u2013320 N\u00b7m depending on trough fill ratio and material cohesion. Apply SF 1.75 for abrasive cement, giving a required reducer rated torque of 315\u2013560 N\u00b7m. We recommend our size 110 or 130 cast-iron worm unit with ratio 17:1 or 20:1. Please provide exact trough length and fill factor for precise sizing.<\/p>\n<\/details>\n

    \nHow is the gearbox mounted to the screw trough end plate?<\/summary>\n

    The preferred method is a B5 face-flange configuration: the gearbox output face (with machined register spigot) bolts directly onto the trough end plate using 4\u20138 bolts. The output shaft extends through the end plate to the screw shaft coupling. This eliminates any exposed shaft length and provides a rigid, sealed joint. We supply 2D and 3D mounting dimension drawings for all frame sizes.<\/p>\n<\/details>\n

    \nIs a worm gearbox suitable for reversing screw conveyor operation?<\/summary>\n

    Yes \u2014 worm gear drives operate in both rotational directions without modification. For reversing operation, ensure the lubrication system (oil splash) remains effective regardless of rotation direction; our symmetrically located oil fill ports ensure this. Note that self-locking worm stages (ratio \u2265 30:1) will resist back-driving from material weight during reversing \u2014 this is usually desirable.<\/p>\n<\/details>\n

    \nWhat seal type prevents fine powder from entering the gearbox?<\/summary>\n

    We use a three-stage seal stack on the output shaft: primary double-lip NBR seal, labyrinth groove to create a grease-packed barrier, and a V-ring seal as a final dust wiper. For very fine powders (<50 \u00b5m particle size), we additionally recommend a positive-pressure purge connection (1\u20132 bar compressed air) on the shaft bore to create outward airflow that prevents particle migration.<\/p>\n<\/details>\n

    \nCan the worm reducer be mounted in any orientation on a screw conveyor?<\/summary>\n

    Standard worm reducers are designed for horizontal mounting (worm shaft horizontal). Vertical or inclined mounting positions require a modified oil fill quantity and may need additional vent\/breather relocation. Specify the mounting angle when ordering and we will supply the unit with adjusted oil level marks and appropriate breather positioning.<\/p>\n<\/details>\n

    \n

    Get the Right Worm Gear Drive for Your Screw Conveyor<\/h2>\n

    Share your conveyed material, screw diameter, and required output speed \u2014 our engineers will select, quote, and send CAD drawings within 24 hours.<\/p>\n

    Send Specifications<\/a>
    \n     View Full Product Range<\/a>\n<\/div>\n

    Explore our full manufacturing capabilities at the Sobre n\u00f3s<\/a> page.<\/p>","protected":false},"excerpt":{"rendered":"

    Worm Gearbox for Screw Conveyors \u2014 Sealed Power for Powder & Bulk Solids Handling Screw conveyors \u2014 also known as auger conveyors or helical screw feeders \u2014 are the go-to solution for moving powders, granules, cement, grain, fertiliser, and other bulk solids through enclosed troughs or pipes. The worm gearbox driving the screw shaft must […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1418],"tags":[1432,1436,1435,1434,1433,1431],"class_list":["post-1700","post","type-post","status-publish","format-standard","hentry","category-conveyor-systems","tag-auger-drive-worm-reducer","tag-flange-mount-worm-gear-unit","tag-powder-conveyor-worm-reducer","tag-screw-feeder-worm-gearbox","tag-worm-gear-drive-bulk-material","tag-worm-gearbox-screw-conveyor"],"_links":{"self":[{"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/posts\/1700","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/comments?post=1700"}],"version-history":[{"count":0,"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/posts\/1700\/revisions"}],"wp:attachment":[{"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/media?parent=1700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/categories?post=1700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chinawormgearbox.xyz\/pt\/wp-json\/wp\/v2\/tags?post=1700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}