{"id":1038,"date":"2026-08-18T08:54:24","date_gmt":"2026-08-18T08:54:24","guid":{"rendered":"https:\/\/superiortransmissioninc.com\/?p=1038"},"modified":"2026-08-18T09:08:36","modified_gmt":"2026-08-18T09:08:36","slug":"selection-of-single-speed-reducers-for-conveyor-belts-in-underground-mines","status":"publish","type":"post","link":"https:\/\/superiortransmissioninc.com\/ru\/application\/selection-of-single-speed-reducers-for-conveyor-belts-in-underground-mines\/","title":{"rendered":"Selection of Single-Speed Reducers for Conveyor Belts in Underground Mines"},"content":{"rendered":"
\n
\n

Mining & Quarrying \u00b7 Application Guide<\/p>\n

A technical reference for engineers and procurement teams specifying worm gear single speed reducers in underground coal, hard-rock, and mineral mining environments across Australia, North America, South Africa, and Europe.<\/p>\n<\/div>\n

<\/p>\n

\n

Underground mine conveyor belts are among the most mechanically demanding continuous-duty applications that a single speed reducer<\/strong> is ever asked to serve. The drive train must start under full load, sustain months of uninterrupted operation in atmospheres laden with coal dust or silica particulate, tolerate ambient temperatures that swing from near-freezing in deep intake airways to elevated levels near exhaust headings, and do all of this in a space envelope constrained by roadway width and roof clearance. Specifying the wrong single stage speed reducer<\/strong> results not in marginal underperformance but in catastrophic failure \u2014 a blocked conveyor in a producing mine face has an immediate and measurable cost per hour.<\/p>\n

This guide covers the mechanical selection criteria, construction requirements, material standards, installation considerations, and lubrication regimes that determine whether a worm gear reducer<\/strong> performs reliably across its full service life in an underground conveyor application. It also identifies the EP-WPDS and EP-WPKA series products from the single-speed reducer range as reference designs that address the most common underground mine conveyor drive specifications.<\/p>\n<\/div>\n

<\/p>\n

\n

Why Single-Stage Reduction Is the Standard for Underground Belt Conveyors<\/h2>\n

Most underground mine belt conveyors operate at belt speeds between 1.5 m\/s and 4.5 m\/s, driven by motors running at 960\u20131480 RPM. The output shaft of the drive pulley turns at 30\u2013120 RPM depending on pulley diameter and belt speed. A single speed reduction<\/strong> stage with a reduction ratio in the range of 10:1 to 40:1 bridges this gap in one step, which is both mechanically simpler and more space-efficient than a two-stage arrangement. In an underground roadway where every cubic metre of excavated space has a capital and ongoing ventilation cost, the compact envelope of a single reduction worm reducer<\/strong> is a genuine engineering advantage over multi-stage inline alternatives.<\/p>\n

The self-locking property of a worm gear drive \u2014 where the worm can drive the wheel but the wheel cannot back-drive the worm at reduction ratios above approximately 20:1 \u2014 is also a valuable inherent safety feature in conveyor applications. On inclined conveyors carrying ore or coal uphill, a self-locking single speed worm gear reducer<\/strong> prevents the loaded belt from running backwards on power loss, reducing dependence on external backstop devices. This characteristic does not eliminate the need for a positive mechanical backstop on high-power or steeply inclined conveyors, but it provides a secondary restraint that improves overall system safety in underground environments where uncontrolled reverse running would pose a serious hazard to personnel and equipment.<\/p>\n<\/div>\n

<\/p>\n

\"Single<\/div>\n

<\/p>\n

\n

Manufacturing Structure of a Single Speed Reducer<\/h2>\n

\u0410 single speed worm reducer<\/strong> consists of five principal structural elements: the worm shaft, the worm wheel, the housing, the input and output bearings, and the oil-retaining sealing system. In the WP-series products commonly specified for underground conveyor drives, the worm shaft is an integral forging \u2014 the worm thread and shaft journals are machined from a single steel billet rather than being assembled from separate components. This eliminates a press-fit interface that could migrate under cyclic loading, ensuring the drive geometry remains constant across the full service life.<\/p>\n

The worm wheel is a composite construction: the wheel hub and spoke structure is cast from ductile iron or cast steel, while the tooth ring \u2014 the portion that contacts the worm \u2014 is a separate bronze or high-tin-bronze annulus that is pressure-cast or shrink-fitted onto the hub. Composite wheel construction allows the more expensive copper alloy to be concentrated where it is needed (at the contact surface) while the less costly ferrous material provides structural bulk and inertia. The housing is a box casting machined in a single datum setup to ensure the bore centrelines of the worm shaft and worm wheel are accurately perpendicular and at the correct centre distance \u2014 errors in this geometry cause uneven load distribution across the tooth face and premature wear.<\/p>\n<\/div>\n

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Material System<\/h2>\n
\n
\n
Worm Shaft \u2014 Case-Hardened Alloy Steel<\/div>\n

The worm thread form is hobbed on low-alloy steel (typically 20CrMnTi or equivalent) and case-carburised to achieve a surface hardness of HRC 58\u201362. After hardening, the thread flanks are precision-ground to achieve the tooth profile accuracy and surface finish (Ra 0.4\u20130.8 \u00b5m) needed for the hydrodynamic oil film to form between worm and wheel under load.<\/p>\n<\/div>\n

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Worm Wheel \u2014 Tin Bronze Alloy<\/div>\n

The tooth ring is cast from ZCuSn10Pb1 (approximately equivalent to BS1400 PB1 or ASTM B505 C90700) \u2014 a high-tin phosphor bronze chosen for its low coefficient of friction against hardened steel, good conformability that allows the tooth surface to wear-in uniformly during the bedding period, and acceptable strength for the contact pressures encountered in medium-duty conveyor drives.<\/p>\n<\/div>\n

\n
Housing \u2014 Ductile Iron or Cast Aluminium<\/div>\n

Smaller frame sizes (centre distance up to approximately 100 mm) are commonly housed in pressure-die-cast aluminium alloy for weight reduction. Larger frame sizes carry ductile iron (GGG50 \/ ASTM A536 Grade 65-45-12) housings for the stiffness needed to maintain bearing bore alignment under the radial and axial loads generated by the worm drive reaction forces. Both materials are finished with a chemical-resistant paint system for underground use.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Reference Selection Table \u2014 WP-Series Single Speed Reducers for Underground Conveyors<\/h2>\n

The table below provides reference selection data for common underground mine conveyor drive configurations using WP-series worm gear speed reducers<\/strong>. All values are indicative; definitive selection requires calculating the service factor for the specific start frequency, load profile, and ambient temperature of each installation.<\/p>\n

\n\n\n\n\n\n\n\n\n
\u0420\u044f\u0434<\/th>\nInput Power Range<\/th>\nReduction Ratio<\/th>\nOutput Torque<\/th>\nTypical Conveyor Role<\/th>\n<\/tr>\n<\/thead>\n
EP-WPDS<\/td>\n0.12 \u2013 15 kW<\/td>\n10:1 \u2013 60:1<\/td>\nUp to ~1800 N\u00b7m<\/td>\nFace conveyor auxiliaries, belt feeders, transfer conveyors<\/td>\n<\/tr>\n
EP-WPKA<\/td>\nUp to 5 \u2013 260 kg rated<\/td>\n10:1 \u2013 60:1<\/td>\nMedium-high torque<\/td>\nMain gate conveyor drives, trunk belt head drives<\/td>\n<\/tr>\n
EP-WPKS<\/td>\nUp to 4 \u2013 365 kg rated<\/td>\n10:1 \u2013 60:1<\/td>\nHigh output torque<\/td>\nHeavy-duty trunk belts, inclined ore conveyors<\/td>\n<\/tr>\n
EP-WPDKA<\/td>\nUp to 5 \u2013 350 kg rated<\/td>\n10:1 \u2013 60:1<\/td>\nHigh torque, dual-input<\/td>\nLong-wall face end drives, multi-motor conveyor stations<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

<\/p>\n

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Recommended Products for Underground Conveyor Drives<\/h2>\n
\n
\n

\"EP-WPDS<\/p>\n

\n

EP-WPDS Single Speed Reducer<\/a> (0.12 \u2013 15 kW)<\/h3>\n

\u041e\u043d EP-WPDS<\/strong> covers the 0.12 to 15 kW input power range \u2014 the bracket that governs the majority of underground face conveyor auxiliary drives, scraper chain feeder drives, and belt feeder units. Its foot\/flange combined mounting accepts both IEC frame motors and close-coupled motor adapters. The vertical input shaft configuration (WPDS designator) positions the motor upright above the reducer, which is particularly useful in low-clearance underground roadways where horizontal motor arrangements would exceed roof clearance. The hardened worm gear pair and tin-bronze wheel deliver sustained efficiency in the 70\u201380% range across the full power band.<\/p>\n<\/div>\n<\/div>\n

\n

\"EP-WPKA<\/p>\n

\n

EP-WPKA Single Speed Reducer<\/a> (5 \u2013 260 kg)<\/h3>\n

\u041e\u043d EP-WPKA<\/strong> addresses the medium-to-heavy end of the underground conveyor drive spectrum. The KA designation indicates a hollow output shaft configuration \u2014 the conveyor drive pulley shaft passes directly through the reducer output bore and is retained by a torque arm that reacts against the conveyor structure. This arrangement eliminates the external coupling between reducer output shaft and pulley shaft that is a common source of misalignment and wear in belt conveyor drives. For main gate belt conveyors and trunk belt installations in Australian longwall mines and North American room-and-pillar operations, the hollow-shaft, torque-arm mounting format is the preferred configuration for new drives and for replacements where access for coupling alignment is limited.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\"Worm<\/div>\n

<\/p>\n

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Service Factor Application and Selection Criteria<\/h2>\n

\u0412\u044b\u0431\u043e\u0440 worm gear speed reducer<\/strong> for an underground conveyor requires applying a service factor to the motor rated power before matching against the reducer’s rated capacity. The base service factor for a belt conveyor with a squirrel-cage induction motor and no more than two starts per hour is typically 1.25\u20131.5 from standard catalogues (AGMA 6034, ISO 9283). In underground mining, additional derating applies for the following conditions:<\/p>\n

\n
\n
Frequent Start-Stop Cycles<\/div>\n

Face conveyors and transfer points that start and stop with the mining cycle \u2014 sometimes 6\u201310 starts per shift \u2014 require a service factor addition of 0.25\u20130.5 above the base value. Each start imposes a torque spike of 2\u20133\u00d7 rated torque on the reducer for the first 2\u20134 seconds of acceleration.<\/p>\n<\/div>\n

\n
Ambient Temperature Elevation<\/div>\n

Worm gear efficiency is temperature-sensitive: as ambient temperature rises above 40 \u00b0C (typical in deep underground workings), oil viscosity falls, reducing film thickness and increasing sliding contact losses. Reducers in high-temperature headings should be specified one frame size larger than the base calculation would indicate to maintain safe oil-film temperature margins.<\/p>\n<\/div>\n

\n
Belt Inclination Angle<\/div>\n

Inclined conveyors carrying ore or coal uphill impose a continuous gravity component on the drive that increases the steady-state torque demand above the level calculated for a horizontal belt of the same length and capacity. For inclinations above 12\u00b0, the steady-state torque increase must be calculated and added to the peak acceleration torque before applying the service factor.<\/p>\n<\/div>\n

\n
Mounting Orientation<\/div>\n

Some underground conveyor installations require the single speed gear reducer<\/strong> to be mounted with the output shaft vertical (horizontal shaft reducer tilted 90\u00b0) or at an intermediate angle to suit the roadway geometry. Non-horizontal mounting affects the oil level within the housing and must be communicated to the supplier at the specification stage so the oil capacity and filler\/drain positions can be adjusted accordingly.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-Worm<\/p>\n

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Lubrication Requirements for Underground Environments<\/h2>\n

The lubricant is the single most consequential maintenance variable in a worm gear reducer<\/strong> installation. Worm gear contact is predominantly sliding rather than rolling \u2014 the relative velocity between worm flank and wheel tooth is high, and the lubricant film is the only thing separating the two surfaces. The correct lubricant for a single speed worm gear reducer<\/strong> in underground mine service is a AGMA 7 or 8 (ISO VG 460 or ISO VG 680) extreme-pressure gear oil with anti-wear additives and a phosphor-bronze compatibility certification \u2014 not all EP additives are compatible with the bronze wheel, and some sulphur-phosphorus additives attack tin bronze aggressively at elevated temperature.<\/p>\n

In underground mines, the additional requirement is that the lubricant must be approved for use in a potentially methane-bearing atmosphere \u2014 in practice, this means the oil must have a flash point above 200 \u00b0C (closed-cup) and must not contain solvents or diluents that could contribute to an ignition hazard. Many surface-specification gear oils meet the AGMA viscosity grade and EP requirement but fail the underground flash-point criterion; the lubricant specification should be confirmed against the mine’s ventilation and electrical safety requirements before ordering. Oil changes at 2000\u20134000-hour intervals are typical for WP-series reducers in underground service, with oil condition monitoring (particle count and viscosity check) recommended at 1000-hour intervals in high-duty installations.<\/p>\n<\/div>\n

<\/p>\n

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Installation, Alignment, and Commissioning<\/h2>\n

Correct installation of a single reduction<\/strong> worm gear unit on a mine conveyor drive begins with verifying that the support structure \u2014 whether a concrete plinth, a steel-channel base frame, or a fabricated conveyor drive frame \u2014 is level, planar, and of adequate stiffness to prevent deflection under the combined weight of motor, reducer, and drive pulley. A base frame that flexes under load will cause the reducer foot pads to distort the housing, introducing misalignment between the worm shaft and wheel centrelines that accelerates tooth wear and bearing failure.<\/p>\n

For the hollow-shaft, torque-arm configuration of the EP-WPKA and EP-WPKS series, commissioning includes verifying that the torque arm rubber bush is in good condition, that the torque arm bolt can move freely in its slot (it must not be pinned or welded, as this would prevent the natural thermal expansion of the housing), and that the torque arm anchorage point on the conveyor structure is at the correct radial distance from the reducer output bore centreline. Incorrect torque arm geometry introduces secondary bending moments into the reducer housing that the designer did not account for and that can crack the housing or fail the output shaft bearing over time. Shaft alignment for coupled configurations should be within 0.05 mm parallel and 0.05\u00b0\/100 mm angular before the coupling is fitted and the motor bolted down.<\/p>\n<\/div>\n

<\/p>\n

\"Worm<\/div>\n

<\/p>\n

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Condition Monitoring and Predictive Maintenance<\/h2>\n

Underground conveyor single speed reducer<\/strong> maintenance has shifted progressively from fixed-interval replacement to condition-based intervention in most modern mining operations. The principal condition indicators for a worm gear reducer are worm shaft bearing vibration (measured by accelerometer at the input bearing housing), output bearing temperature (thermocouple or infrared), oil temperature (thermocouple in the sump), and oil particle count from periodic sampling. Early-stage worm wheel tooth wear produces bronze particles in the oil that are detectable at particle concentrations of 50\u2013200 ppm before any vibration or temperature signal becomes apparent \u2014 making oil sampling the most sensitive early-warning tool available for this component type.<\/p>\n

Vibration analysis on a worm reducer is less straightforward than on a parallel-shaft gearbox because the worm mesh frequency and its harmonics overlap with bearing defect frequencies in a way that is difficult to separate without detailed signal processing. Temperature monitoring is more reliable as a trend indicator: a rise in steady-state oil-sump temperature of more than 10 \u00b0C above the historical baseline (at the same load and ambient conditions) consistently indicates either increased internal friction from tooth wear, reduced oil viscosity from thermal degradation, or partial loss of oil from a seal leak. Underground mine maintenance teams in South Africa, Australia, and Canada have standardised on quarterly oil samples and monthly bearing temperature trending as the minimum condition monitoring regime for primary conveyor drive reducers.<\/p>\n<\/div>\n

<\/p>\n

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Manufacturing Capability \u2014 Over a Decade of Gearbox Engineering<\/h2>\n

Our manufacturing facility has operated in mechanical power transmission for more than ten years, producing a wide range of drivetrain components for industrial, agricultural, and mining applications under ISO 9001:2015 quality management system certification. The product range covers agricultural gearboxes, worm gear reducers, planetary gear drives, power take-off shafts, hydraulic cylinders, precision gears, roller chains, and electric motors. Structural housings are produced in ductile iron, grey cast iron, cast steel, precision investment-cast steel, and aluminium alloy to match the specific load, environmental, and weight requirements of each product. Gears, sprockets, worm wheels, pulleys, worm shafts, and output shafts are machined on multi-axis CNC hobbing, grinding, and turning centres to DIN and ISO dimensional standards. Customers requiring a complete conveyor drive system \u2014 reducer, motor, coupling, and mounting hardware \u2014 can source through a single technically accountable manufacturing partner rather than coordinating across multiple vendors.<\/p>\n

\u041c\u0430\u0441\u0442\u0435\u0440-\u043a\u043b\u0430\u0441\u0441<\/h3>\n
\n
\"Worm
\n\"Worm
\n\"Main
\n\"Gearbox<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Compatible Drive Components<\/h2>\n

A complete underground conveyor drive station requires more than the reducer alone. The following complementary product lines are available from the same supply source, allowing engineers to procure a fully matched, tested drive train rather than integrating components from separate vendors.<\/p>\n

\n
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\"Electric<\/p>\n

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\u042d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0432\u0438\u0433\u0430\u0442\u0435\u043b\u0438<\/h3>\n

\u041d\u0430\u0448 \u042d\u043b\u0435\u043a\u0442\u0440\u043e\u0434\u0432\u0438\u0433\u0430\u0442\u0435\u043b\u0438<\/strong><\/a> range covers IEC standard frame sizes from fractional-kilowatt to high-power units compatible with the WPDS and WPKA reducer input configurations. Motors are available in standard, energy-efficient (IE2\/IE3), and mine-duty (increased protection) variants for underground applications. Matched motor-reducer packages are dimensionally verified before shipment, eliminating the risk of interface surprises during site installation.<\/p>\n<\/div>\n<\/div>\n

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\"Worm<\/p>\n

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\u0427\u0435\u0440\u0432\u044f\u0447\u043d\u0430\u044f \u043a\u043e\u0440\u043e\u0431\u043a\u0430 \u043f\u0435\u0440\u0435\u0434\u0430\u0447<\/h3>\n

Where the application requires a compact inline \u0427\u0435\u0440\u0432\u044f\u0447\u043d\u0430\u044f \u043a\u043e\u0440\u043e\u0431\u043a\u0430 \u043f\u0435\u0440\u0435\u0434\u0430\u0447<\/strong><\/a> rather than the open-frame WP-series arrangement, the full NMRV and RV-series range provides reduction ratios from 5:1 to 100:1 in aluminium alloy housings with IEC flanged input faces. These units are commonly used on transfer point scrapers, sampler drives, and ancillary equipment within the same conveyor system, allowing a single supplier relationship to cover the full range of drive equipment in the mine.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\n

\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n
\n
\nQ1. Which single speed reducer series is best suited for a main gate belt conveyor in an underground longwall coal mine in Australia?<\/summary>\n
\n

For Australian longwall main gate belt conveyors, the EP-WPKA hollow-shaft series is generally the most practical specification. The hollow output shaft eliminates the need for an external coupling between the reducer and the drive pulley shaft \u2014 a component that in underground coal environments is difficult to align correctly and requires regular maintenance inspection. The torque-arm reaction arrangement transfers the reducer reaction force through a rubber bush to the conveyor structure, absorbing minor structural movements without transmitting bending moments into the reducer housing. For a standard 1000 mm wide main gate belt running at 3.0 m\/s with a 5.5\u201311 kW drive motor, the WPKA in the 50\u201380 kg unit-weight range with a 25:1 or 30:1 reduction ratio covers the majority of Australian longwall gate conveyor specifications.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nQ2. How do I calculate the correct service factor for a worm gear speed reducer on an inclined underground ore conveyor in South Africa?<\/summary>\n
\n

For an inclined ore conveyor in a South African underground hard-rock mine, the service factor calculation begins with the AGMA 6034 base factor for continuous duty (typically 1.25 for a smooth AC motor drive) and then applies additive factors for: inclination above 12\u00b0 (+0.25\u20130.5 depending on angle), start frequency above 2 per hour (+0.25 per additional 2 starts\/hour), elevated ambient temperature above 40 \u00b0C (+0.25 for each 10 \u00b0C above 40 \u00b0C), and shock loading if the conveyor receives direct surge loading from an ore pass or crusher discharge (+0.25\u20130.5). The corrected motor power \u2014 rated motor power \u00d7 service factor \u2014 is the figure used to enter the worm gear reducer<\/strong> selection catalogue. Select the reducer frame size whose rated output torque at the desired reduction ratio exceeds the corrected duty torque by at least 10% to allow for uncertainty in the load estimation.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nWhat are the key disadvantages of a single reduction worm gear drive compared to a helical gear drive for a high-power underground conveyor in Canada?<\/summary>\n
\n

The two principal disadvantages of a single reduction worm reducer<\/strong> relative to a helical-bevel parallel-shaft drive are efficiency and power limit. Worm gear drives in the 20:1 \u2013 40:1 ratio range typically achieve 70\u201382% efficiency, compared with 96\u201398% for a comparable helical-bevel arrangement. At high drive powers \u2014 say 30 kW or above \u2014 the heat generated by the efficiency loss in the worm unit requires a larger housing with additional cooling capacity or forced oil circulation, which can offset the cost advantage of the simpler worm design. For underground Canadian hard-rock mines where primary conveyor drives commonly run at 15\u201355 kW, the worm drive remains competitive up to approximately 22 kW in standard catalogue frame sizes; above this level, a helical-bevel or parallel-shaft double-reduction arrangement is typically more economical when the whole-life energy cost is included in the comparison.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nHow often should the oil be changed in a single speed worm gear reducer installed on an underground conveyor in a hot deep-level mine?<\/summary>\n
\n

In a deep-level mine where ambient temperatures in the working section exceed 35\u201340 \u00b0C, the thermal degradation rate of ISO VG 460 or VG 680 gear oil roughly doubles for every 10 \u00b0C above the 40 \u00b0C reference temperature used in standard oil-life calculations. An oil that would last 4000 hours at 40 \u00b0C ambient may need replacement at 2000 hours at 50 \u00b0C ambient and at 1000 hours at 60 \u00b0C ambient. For a hot underground mine, the practical recommendation is to establish the actual oil temperature at the steady-state operating point using a thermocouple in the oil sump during commissioning, then use this temperature in the Arrhenius degradation equation to calculate the site-specific oil change interval. Quarterly oil sampling with particle count and viscosity analysis is strongly recommended regardless of the calculated interval \u2014 the sample result can extend or shorten the planned change interval based on actual oil condition rather than theoretical calculation alone.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nWhere can a mining equipment procurement team in Europe find a reliable single speed reducer supplier with OEM customisation and technical documentation support?<\/summary>\n
\n

European mining procurement teams specifying single speed reducer<\/strong> units for underground conveyor applications should look for suppliers that can provide: dimensional drawings in ISO third-angle projection, rated output torque curves across the full ratio range, oil volume and type specifications for each mounting orientation, and a declaration of conformity referencing the applicable Machinery Directive harmonised standards. OEM customisation \u2014 non-standard output bore dimensions, modified torque arm provisions, special paint systems for aggressive underground atmospheres, or metric\/inch shaft combinations \u2014 is available from manufacturers who hold the original tooling for the housing castings rather than sourcing through distribution. Requesting a Factory Acceptance Test (FAT) certificate and an ISO 9001:2015 quality management system certificate from the prospective supplier is the standard due-diligence step for European mining procurement under EN ISO 12100 machinery safety requirements.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

\u0420\u0435\u0434\u0430\u043a\u0442\u043e\u0440: PXY<\/p>","protected":false},"excerpt":{"rendered":"

Mining & Quarrying \u00b7 Application Guide A technical reference for engineers and procurement teams specifying worm gear single speed reducers in underground coal, hard-rock, and mineral mining environments across Australia, North America, South Africa, and Europe. Underground mine conveyor belts are among the most mechanically demanding continuous-duty applications that a single speed reducer is ever […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[40],"tags":[],"class_list":["post-1038","post","type-post","status-publish","format-standard","hentry","category-mining-quarrying"],"_links":{"self":[{"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/posts\/1038","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/comments?post=1038"}],"version-history":[{"count":3,"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/posts\/1038\/revisions"}],"predecessor-version":[{"id":1045,"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/posts\/1038\/revisions\/1045"}],"wp:attachment":[{"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/media?parent=1038"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/categories?post=1038"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ru\/wp-json\/wp\/v2\/tags?post=1038"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}