CN105819333B - A kind of travelling crane truck deceleration unit - Google Patents

A kind of travelling crane truck deceleration unit Download PDF

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Publication number
CN105819333B
CN105819333B CN201610374135.3A CN201610374135A CN105819333B CN 105819333 B CN105819333 B CN 105819333B CN 201610374135 A CN201610374135 A CN 201610374135A CN 105819333 B CN105819333 B CN 105819333B
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Prior art keywords
gear
level
transmission
teeth
modulus
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CN105819333A (en
Inventor
李冰
朱进兴
黄勇清
陈龙
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C9/00—Travelling gear incorporated in or fitted to trolleys or cranes
    • B66C9/14—Trolley or crane travel drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/08—Profiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Gears, Cams (AREA)
  • Retarders (AREA)

Abstract

The present invention relates to a kind of travelling crane truck deceleration unit, including some gear reducers and frequency converter, the gear reducer is secondary drive mechanism, mainly include high speed shaft, gear set one, jackshaft, gear set two and output shaft, gear set one coordinates with high speed shaft and jackshaft to form first order transmission respectively, gear set two coordinates with jackshaft and output shaft to form second level transmission respectively, and secondary drive mechanism has the transmission effect of national standard three-level gear reducer.The travelling crane truck deceleration unit of the present invention uses secondary transmission gear reducer, simple in structure, under high load capacity operating mode, is hardly damaged, and manufacture cost is reduced, and transmission efficiency higher, stabilizes production.

Description

A kind of travelling crane truck deceleration unit
Technical field
The present invention relates to a kind of travelling crane truck deceleration unit, more particularly to it is a kind of constant in installation site and installation dimension Under the premise of, the Transform Type design of gear reducer, increases gear reducer bearing capacity and shock loading.
Background technology
Gear reducer is one of iron and steel domain heat treatment production important equipment, in view of the particularity of heat treatment production process, OK The use of car becomes the core of main line production, is become using operating rate for focus.It is complete for 24 gear reducer twenty four hours Weather operates, and frequently opens, brakes and live load is very big, often result in gear shaft break, gear tooth breakage and phenomena such as off-axis, seriously Constrain production security.At the same time equipment and spare part cost is also increased.Yield was especially heat-treated in recent years not It is disconnected soaring, further increase gear reducer and frequently open, brake number, increase the impact of gear shaft, gear, cause tooth form abrasion tight The increase of the fatigue load of weight and axis, breaks down so easilying lead to gear reducer.4 gear reducers especially used on the same stage, If a damage, stop production replace not in time, be bound to cause the driving load increase of other 3 gear reducers, cause car body whole Body reverses and gnaws rail phenomenon, serious to cause vehicle body frame to deform.At the same time when traveling crane weight is run, due to crossbeam Deformation, gnaw that rail phenomenon is obvious all the more, gnaw rail phenomenon cause to drive a vehicle driving wheel driving resistance and load impacting when gnawing rail, It is bound to cause gear reducer off-axis, broken teeth phenomenon occurs.If high-speed cruising, more aggravate the generation of such a phenomenon.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of deceleration unit improved for the above-mentioned prior art, Ensure not damage under the operating mode of heavy-duty service, prolong the service life, reduce cost, steady production.
Technical solution is used by the present invention solves the above problems：A kind of travelling crane truck deceleration unit, including some subtract Fast machine and frequency converter, the gear reducer is secondary drive mechanism, mainly including high speed shaft, gear set one, jackshaft, gear set two And output shaft, gear set one coordinate with high speed shaft and jackshaft to form first order transmission respectively, gear set two respectively with centre Axis and output shaft coordinate to form second level transmission；
Secondary drive mechanism has the transmission effect of national standard three-level gear reducer, and the design parameter of secondary drive mechanism is as follows：
The first order：Gear shaft minimum diameter 50mm；
4 mm of modulus；
The number of teeth 17/73；
9 degree of helical angle；
Tooth justifies 80.344/305.36mm surely；
The second level：Gear shaft minimum diameter 90mm；
Modulus 5.5mm；
The number of teeth 16/74；
10 degree of helical angle；
Tooth justifies 105.28/426.335mm surely；
Head center is away from a=185+255=440mm；
Overall ratio I=19.85.
Single travelling crane truck travelling mechanism includes four gear reducers and two frequency converters, and two gear reducers correspond to a frequency conversion Device.
Designing and developing for above-mentioned secondary transmission gear reducer follows following principle：
The parameter of electric machine；30kw 980rpm；Travelling crane truck travelling mechanism is driven using four mechanisms, and 2 frequency converters are dragged using one Two forms, 2 frequency converter debugging scope 0---1000rpm.
At the scene working condition and originally using three-level transmission speed reducer bikini installation form and location dimension it is constant, and On the premise of overall ratio is basically unchanged, non-national standard speed is modified as by the gear reducer three-level driven Design of national standard and compares two level Transmission speed reducer.
First, after gear reducer remodeling, cabinet design length is constant by former gear reducer centre-to-centre spacing, and length direction volume increases to maximum Bulk；Cabinet design is highly constant by former gear reducer installed height mark, and short transverse volume extends downward into maximum space ruler It is very little；
Slow speed turbine stage gear wheel directly affects the size of gear reducer, reduces low speed stage gear ratio, that is, reduces slow speed turbine stage canine tooth Take turns and contain the size of its babinet；Increase high speed level gearratio, that is, increase high speed level gear wheel size, reduce with it is low The size of fast level gear wheel is poor.It is basically unchanged, increases in gear reducer installation form and location dimension and overall ratio first, design meets The mentality of designing of big babinet；Second, be conducive to gears at different levels bath lubrication at the same time.
2nd, after gear reducer remodeling, the gear shaft number of teeth and monodentate tooth number and modulus determine
Using flimsy three-level transmission speed reducer speed ratio and centre-to-centre spacing before remodeling as design parameter foundation, it then follows gearratio is determined Fixed tooth number, centre-to-centre spacing and the number of teeth determine the principle Method of Spreading Design of modulus.
（1）With the fast ratio of the fragile gear reducer used before remodeling for design parameter foundation, it then follows gearratio determines the number of teeth.
Secondary transmission is changed to for the fragile gear reducer three-level transmission used before remodeling, will in three-level transmission national standard design Transmission Ratio Control is asked to meet secondary transmission national standard design requirement Transmission Ratio Control ± 4% as far as possible while ± 5%.But due to basis The maximum body structure size of in-site installation design, is unsatisfactory for the design of national standard secondary transmission, i.e., by the gearratio distribution gear number of teeth Design forms the non-national standard gear reducer Transmission Ratio Control of secondary transmission 4.24%.If gearratio national standard 20, two level subtracts Speed, carries out gearratio distribution, design gearratio is 19.957 according to the equal condition of tooth contact intensity.
In order to make gear drive compact, the number of teeth of selection high speed level little gear is calculated, close to the minimum number of teeth allowed （Using the number of teeth of fragile three-level transmission speed reducer high speed level little gear as minimum number of teeth）, ensure that root does not occur to be cut（For hard tooth Gear drive tooth root flexural fatigue in face fractures tooth root bending-fatigue strength criterion）The number of teeth set for the benchmark of the number of teeth Meter, its design rule：Gearratio, equal to number of gear teeth inverse ratio, it is integer that the number of teeth, which is chosen,.
（2）Using the fragile gear reducer centre-to-centre spacing used before remodeling as design parameter foundation, it then follows centre-to-centre spacing and the number of teeth are determined The principle Method of Spreading Design of cover half number.
Utilize（1）The design secondary transmission gear reducer number of teeth, keep three-level drive centre distancc is constant to be changed to secondary transmission deceleration Machine.Modulus is directly proportional to centre-to-centre spacing, with the number of teeth and being inversely proportional；Secondary transmission design modulus increases when three-level drive centre distancc is constant Greatly, the number of teeth is reduced；
When the selection of module is design of gears, according to Strength co-mputation, check what is determined.The check of modulus intensity is root The number of teeth and modulus, job specification, lubrication consideration according to setting etc. are applied mechanically design formula and are checked, and are depended on because modulus is set Reason is manufactured, will not go to produce the gear of a variety of moduluses, modulus species more multi-processing cost is higher, so being arranged during design Go out various combinations to be checked, which meets which condition uses.
3rd, the defects of fragile three-level transmission speed reducer used before retrofiting fractures there are high speed shaft and jackshaft torsion； Design increase high speed shaft, middle shaft diameter, accordingly increase torsional strength.
Axis is one of major part for forming gear reducer, and itself requirement has enough strength and stiffness, sufficiently accurate Size and higher surface roughness, will also have high hardness with the journal surface at bearing fit, thus material selection should have There is higher comprehensive mechanical performance, and larger impact load can be often born in working.
（1）The torsion of fragile three-level transmission speed reducer high speed shaft and jackshaft fractures, and mainly torsional strenght is not enough made Into.By torsional strenght（Section factor and cross sectional shape determine）Constraints, calculates transmission torque, the circumference of gear of axis Power, the radial load of gear, the axial force of gear, the material of chosen axis（Yield strength converts）, determine the minimum diameter of axis.This In design be according to the maximum gauge of three-level transmission speed reducer high speed shaft and jackshaft as secondary transmission gear reducer high speed shaft with The minimum diameter of jackshaft.
（2）Press the support of axis upper bearing (metal), gear installation position and parts on shaft positioning, processing request and different component assembly sides The geometry constraint conditions such as formula, and it is to be subject to radial load and axial force at the same time that bearing is installed on gear shaft from amechanical angle, determines axis Structure design and structure size and bearing designation.
（3）According to structure size and job requirement, physical constraint is selected, checks whether to meet corresponding physical constraint, if It is unsatisfactory for, necessary modification need to be made to axle construction size, until meeting the requirements.
（4）After transmission shaft structure size is selected, force analysis, is starting point from axial force and radial load is overcome, determines auxiliary Help the structure size of part.
Compared with existing three-level transmission speed reducer, the advantage of the invention is that：
1）, secondary transmission than three-level transmission efficiency, for same type gear reducer, series reduces transmission efficiency and increases. If secondary transmission efficiency is 98%, then three-level transmission efficiency is 96.04%=98% × 98%.
2）, modulus increase, the increase of high speed shaft diameter, the increase of middle shaft diameter, accordingly increase torsional strength, its equipment is reliable Property it is high.
3）, structure design advantages of simple, easy to assembly or disassembly.
4）, bearing capacity raising, gear shock stiffness increase.
5）, maintenanceability it is strong, interchange level is high, is gone out with slow-speed shaft using double speed at a high speed, and transmission shape is installed from gear reducer The influence of formula, for 24 gear reducers of scene installation, Parts Inventory 2.
6）, under specific application target, meet intensity, rigidity and stability requirement.
7）, reduce gear, gear shaft, the big part stock of interchangeability such as axis, shorten delivery cycle.
8）, shorten the gear reducer complete machine production cycle, reduce stock.
9）, the size of part, specification simplify unified, greatly reduce number of parts in series.
10）, remodeling secondary transmission gear reducer use after, machine life improve more than 4 times.
Brief description of the drawings
Fig. 1 is the structure of this existing three-level transmission speed reducer；
Fig. 2 is the structure of secondary transmission gear reducer in the embodiment of the present invention；
In Fig. 1,1.1 high speed shafts, 1.2 gears I, 1.3 jackshafts one, 1.4 gears II, 1.5 jackshafts two, 1.6 gears III, 1.7 output shaft.
Embodiment
The present invention is described in further detail below in conjunction with attached drawing embodiment.
As shown in Fig. 2, the gear reducer in the present embodiment is secondary drive mechanism, mainly include high speed shaft 1, gear set 1, Jackshaft 3, gear set 24 and output shaft 5, gear set 1 coordinate with high speed shaft 1 and jackshaft 3 to form first order biography respectively Dynamic, gear set 24 coordinates with jackshaft 3 and output shaft 5 to form second level transmission respectively.
Above-mentioned gear reducer parameter；30kw 980rpm；Travelling crane truck travelling mechanism is driven using four mechanisms, and 2 frequency converters are adopted With one drag two form, 2 frequency converter debugging scope 0---1000rpm.
Secondary drive mechanism has the transmission effect of national standard three-level gear reducer, and the design parameter of secondary drive mechanism is as follows：
The first order：Gear shaft minimum diameter 50mm；
4 mm of modulus；
The number of teeth 17/73；
9 degree of helical angle；
Tooth justifies 80.344/305.36mm surely；
The second level：Gear shaft minimum diameter 90mm；
Modulus 5.5mm；
The number of teeth 16/74；
10 degree of helical angle；
Tooth justifies 105.28/426.335mm surely；
Head center is away from a=185+255=440mm；
Overall ratio I=19.85；
The design method of secondary drive mechanism is as follows：
Power of motor 30Kw, rotating speed 980rpm, centre-to-centre spacing 440mm
First, shaft design is inputted
（1）, material selection：20CrMnTi material coefficients A=98-107, dangerouse cross-section suitably increases 4 according to keyway- 5%；
（2）, axis minimum diameter choose:
d ≥A=33.705mm
This diameter of axle of three-level gear reducer is 35mm, also meets design requirement；But after onsite application, it is disconnected for danger herein , there is repeatedly fracture in face；
Consider and take:Input gear axle minimum diameter takes 50mm；
2nd, gearratio is distributed
Preliminary distribution gearratio, gearratio distribution should be reasonable, meet the work characteristics of transmission, and make compact-sized, size Even structure is reasonable, will not interfere between driving parts.Arranged by expansion, lubrication and radiating condition are considered, to make two-stage big Gear diameter is similar, as far as possible close to national standard three-level gear reducer speed ratio, if different from three-level transmission speed ratio, should select frequency converter can The scope of speed governing, the basic speed of service for keeping national standard three-level gear reducer, contrast national standard developed curve obtain：Gearratio I=4.294 ×4.625；
3rd, tooth Shape Design
Designed by national standard and choose helical gear
（1）, choice of material 20CrMnTi take its strength grade by MQ grades of quality：Yield strength 835MPa, tensile strength 1080 MPa；
（2）, basic data using the parameter of national standard three-level gear reducer as transformation 2-level reducer design parameter, with reference to existing The statistical analysis of the various point that breaks down of field frequency, determines centre-to-centre spacing and modulus,
Utilize empirical equation m=(0.007-0.03) a
Wherein：M-modulus；A-centre-to-centre spacing
Level-one, two level modulus and the centre-to-centre spacing of secondary transmission gear reducer are determined respectively, and ensure 440mm head center away from not Become,
According to the second level modulus of live national standard three-level gear reducer be 3 when there is tooth root phenomenon of rupture；
When designing two level, first order modulus takes m1=4；Just determine a with reference to above-mentioned empirical equation1=185
Second level modulus takes m1=5.5；Just determine a with reference to above-mentioned empirical equation1=255
It is 0.021 in 0.007~0.03 that coefficient is taken in calculating；
It is preferred series modulus that modulus is taken in calculating；
Head center is away from 440=185+255；
（3）, in view of the stationarity of transmission, with reference to the parameter of national standard three-level gear reducer, Preliminary design helical angle φ=9 degree；
（4）, determine the number of teeth and gearratio
Follow number of teeth selection principle：Any tooth is formed with a minimum number of teeth, to prevent that root is produced in gear hobbing to be cut, during selection It is more than minimum number of teeth 17 as far as possible：
Z1=2a COSφ/m(i+1)
Z2=Z1 i
Wherein：Z1And Z2It is the number of teeth of one pair of which gear；
A be a pair of of gear centre away from；
I is that the speed of a pair of of gear compares Z2/ Z1；
Obtain：Z2=73.65 take Z2=73
I1= Z2/ Z1=73/17=4.29
If keep being basically unchanged with national standard three-level transmission overall ratio 19.57, I2= Z3/ Z4=19.57/4.29= 4.56
To ensure that 2-level reducer can reach the speed of service of national standard three-level gear reducer, and control in variable-frequency motor speed governing In the range of adjustable speed, overall ratio is adjusted to 19.82, and helical angle φ=10 degree, meet that secondary gear distributes,
Similarly two level is drawn：Z3=16 Z4=74
（5）, essence seek helical angle φ：COSφ= m(Z1+ Z2) meet the requirements after 2a；
（6）, determine gear compound graduation circular diameter
Normal module=transverse module × COS φ
Reference diameter=transverse module × number of teeth=(normal module/COS φ) × number of teeth.
The travelling crane truck deceleration unit of said structure uses secondary transmission gear reducer, simple in structure, under high load capacity operating mode, It is hardly damaged, manufacture cost is reduced, and transmission efficiency higher, stabilizes production.
In addition to the implementation, it is all to use equivalent transformation or equivalent replacement present invention additionally comprises there is other embodiment The technical solution that mode is formed, should all fall within the scope of the hereto appended claims.

Claims (2)

1. a kind of travelling crane truck deceleration unit, including some gear reducers and frequency converter, it is characterised in that：The gear reducer is two level Transmission mechanism, mainly including high speed shaft, gear set one, jackshaft, gear set two and output shaft, gear set one respectively with high speed shaft Coordinate with jackshaft to form first order transmission, gear set two coordinates with jackshaft and output shaft to form second level biography respectively It is dynamic；
Secondary drive mechanism has the transmission effect of national standard three-level gear reducer, and the design parameter of secondary drive mechanism is as follows：
The first order：Gear shaft minimum diameter 50mm；
4 mm of modulus；
The number of teeth 17/73；
9 degree of helical angle；
Tooth justifies 80.344/305.36mm surely；
The second level：Gear shaft minimum diameter 90mm；
Modulus 5.5mm；
The number of teeth 16/74；
10 degree of helical angle；
Tooth justifies 105.28/426.335mm surely；
Head center is away from a=185+255=440mm；
Overall ratio I=19.85；
The design method of secondary drive mechanism is as follows：
Power of motor 30Kw, rotating speed 980rpm, centre-to-centre spacing 440mm
First, shaft design is inputted
（1）, material selection：20CrMnTi material coefficients A=98-107, dangerouse cross-section suitably increase 4-5% according to keyway；
（2）, axis minimum diameter choose:
d ≥A =33.705mm
This diameter of axle of three-level gear reducer is 35mm, also meets design requirement；But after onsite application, it is herein critical section, goes out Now repeatedly fracture；
Consider and take:Input gear axle minimum diameter takes 50mm；
2nd, gearratio is distributed
Preliminary distribution gearratio, gearratio distribution should be reasonable, meet the work characteristics of transmission, and make compact-sized, dimensional structure Uniformly rationally, will not interfere between driving parts；Arranged by expansion, lubrication and radiating condition are considered, to make two-stage gear wheel Diameter is similar, as far as possible close to national standard three-level gear reducer speed ratio, if different from three-level transmission speed ratio, should select frequency converter adjustable speed Scope, the basic speed of service for keeping national standard three-level gear reducer, contrast national standard developed curve obtains：Gearratio I=4.294 × 4.625；
3rd, tooth Shape Design
Designed by national standard and choose helical gear
（1）, choice of material 20CrMnTi take its strength grade by MQ grades of quality：Yield strength 835MPa, tensile strength 1080 MPa；
（2）, basic data using the parameter of national standard three-level gear reducer as transformation 2-level reducer design parameter, with reference to live frequency The statistical analysis of the various point that breaks down, determines centre-to-centre spacing and modulus,
Utilize empirical equation m=(0.007-0.03) a
Wherein：M-modulus；A-centre-to-centre spacing
Level-one, two level modulus and the centre-to-centre spacing of secondary transmission gear reducer are determined respectively, and ensure 440mm head center away from constant,
According to the second level modulus of live national standard three-level gear reducer be 3 when there is tooth root phenomenon of rupture；
When designing two level, first order modulus takes m1=4；Just determine a with reference to above-mentioned empirical equation1=185
Second level modulus takes m1=5.5；Just determine a with reference to above-mentioned empirical equation1=255
It is 0.021 in 0.007~0.03 that coefficient is taken in calculating；
It is preferred series modulus that modulus is taken in calculating；
Head center is away from 440=185+255；
（3）, in view of the stationarity of transmission, with reference to the parameter of national standard three-level gear reducer, Preliminary design helical angle φ=9 degree；
（4）, determine the number of teeth and gearratio
Follow number of teeth selection principle：Any tooth is formed with a minimum number of teeth, and to prevent that root is produced in gear hobbing to be cut, when selection tries one's best More than minimum number of teeth 17：
Z1=2a COSφ/m(i+1)
Z2=Z1 i
Wherein：Z1And Z2It is the number of teeth of one pair of which gear；
A be a pair of of gear centre away from；
I is that the speed of a pair of of gear compares Z2/ Z1；
Obtain：Z2=73.65 take Z2=73
I1= Z2/ Z1=73/17=4.29
If keep being basically unchanged with national standard three-level transmission overall ratio 19.57, I2= Z3/ Z4=19.57/4.29=4.56
To ensure that 2-level reducer can reach the speed of service of national standard three-level gear reducer, and control in variable-frequency motor speed adjustable range Interior adjustable speed, overall ratio are adjusted to 19.82, and helical angle φ=10 degree, meet that secondary gear distributes,
Similarly two level is drawn：Z3=16 Z4=74
（5）, essence seek helical angle φ：COSφ= m(Z1+ Z2) meet the requirements after 2a；
（6）, determine gear compound graduation circular diameter
Normal module=transverse module × COS φ
Reference diameter=transverse module × number of teeth=(normal module/COS φ) × number of teeth.
2. travelling crane truck deceleration unit according to claim 1, it is characterised in that：Single travelling crane truck travelling mechanism includes Four gear reducers and two frequency converters, two gear reducers correspond to a frequency converter.
CN201610374135.3A 2016-05-31 2016-05-31 A kind of travelling crane truck deceleration unit Active CN105819333B (en)

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Publication number Priority date Publication date Assignee Title
CN114671344B (en) * 2022-05-27 2022-08-09 河南东起机械有限公司 Crane power assembly

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JPH07206334A (en) * 1994-01-19 1995-08-08 Mitsubishi Electric Corp Hoisting device of elevator and manufacture thereof
CN2937653Y (en) * 2006-08-03 2007-08-22 宁波东力传动设备股份有限公司 Clearance operating reducer
KR101496549B1 (en) * 2013-07-02 2015-02-26 현대위아 주식회사 Hook for crane
CN204237450U (en) * 2014-11-28 2015-04-01 孙庆成 Hoisting crane translation driving device
CN104455223A (en) * 2014-12-05 2015-03-25 成都合瑞辰科技有限公司 Novel speed reduction device for railway station electric sweeper
CN204664306U (en) * 2015-04-16 2015-09-23 凤阳县鼎盛矿山设备有限公司 Vertical shaft type Two Grade Column Gear Reducer
CN204778406U (en) * 2015-05-27 2015-11-18 武汉钢铁(集团)公司 Controlling means that rectifies is taken turns in walking

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