CN2080588U

CN2080588U - High gear ratio cylindrical gear speed reduction unit

Info

Publication number: CN2080588U
Application number: CN 89216176
Authority: CN
Inventors: 王德发
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-11-03
Filing date: 1989-11-03
Publication date: 1991-07-10

Abstract

The utility model relates to a high gear ratio cylindrical gear speed reducer, and the function of the speed reducer is to drive a fire grate and adjust the speed of a fire grate so as to cause the speed of a fire grate to be regulated between 0.5-22 meters per hour. The utility model is a horizontal welding box body which is composed of a cone pulley speed regulation device, a safeguard device and a gear speed reduction device and a three stage transmission speed reducer with splitting surfaces and parallel shafts. Besides, each stage gear pair of the gear speed reduction device is composed of full recess transmission gears of which the number of small gear teeth are respectively 2, 3, 4 and gear ratio is higher than 10.

Description

High gear ratio cylindrical gear speed reduction unit

The utility model relates to a kind of big gear ratio garden stud wheel retarder that drives fire grate and regulate fire grate speed.

Prior art is the GJ100 type boiler speed reducer of 8 years national boiler industry co-design.Its shape is a casting box, and is horizontal, three split surfaces, parallel axes, six grades of gear reduction transmission devices.

Its structure is: arrangements for speed regulation are that excitation speed governing threephase asynchronous constitutes with belt reduction unit; Safety protection device is that axial castellated safety clutch constitutes with the stroke switch; Gear reducer is that six grades of transmissions of involute parallel axes constitute.

Its function is: the output shaft rotating speed is 0.160～0.016 rev/min; Mechanical efficiency is 72%; Fire grate speed is regulated between 1.27～12.7m/h.

Operation practice explanation: the fire grate speed adjustable range is narrow, can not fully satisfy the needs of different coal velocity of combustion; And the efficient low quality is big.

Desire further to widen fire grate speed, the common practice is further to increase transmission progression, like this, certainly will cause transmission efficiency further to reduce, and power consumption is big; Volume, quality further increase, waste material.

The purpose of this utility model is that a kind of three grades of transmissions will be provided, and the train overall ratio is 10152 driving fire grate and the big gear ratio garden stud wheel retarder of regulating fire grate speed.It can make the fire grate speed adjustable range change between 0.5～22m/h, fully satisfies the needs of different coal velocity of combustion, thereby improves the thermal efficiency of boiler.

Shape of the present utility model is: welding casing, horizontal, split surface, parallel axes, three grades of transmission decelerating device; Its structure is: arrangements for speed regulation are that excitation speed governing threephase asynchronous constitutes with secondary cone pulley arrangements for speed regulation.Safety protection device radially steel ball protecting device constitutes with the stroke switch; Gear reducer is three grades of transmissions of involute parallel axes positive-angle displacement helical gear.

The purpose of this utility model is achieved in that gear reducer is by involute, the positive-angle displacement, three grades of transmissions of Helical Cylindrical Gear constitute, and the little tooth number of gear pairs at different levels is respectively 2,3,4, and odd number transmission gear ratio all constitutes greater than 10 the driving gear of nibbling out entirely.

Usually the one pole gear ratio limit of transferring power is 8～10.

For gear ratio is increased, it is the most effective adopting the method that reduces little tooth number.(under the gear pair number of teeth and the certain situation).

How to realize big gear ratio transmission, to guarantee that promptly meshing performance satisfies contact strength, flexural strength, bonding strength again, and the certain intensity deposit is arranged, its key is how to choose the modification coefficient of large and small gear, modification coefficient choose must satisfy four restrictive conditions promptly: the net slip coefficient of " contact ratio, addendum thickness; root interference, undercut " and gear pair and be about 1.2, overlap contact ratio more than or equal to 1 and total contact ratio equal 2.09; Keep the whole addendum of steamboat, the whole dedendum of the tooth of bull wheel are participated in engagement, carry out and nibble out transmission entirely.

The utility model reduces transmission progression owing to selected big gear ratio deceleration train for use, and velocity ratio increases.And making mechanical efficiency improve 30%, volume-diminished, quality alleviate 1/3; Fire grate speed is widened 4.3 times, fully satisfies the needs of different coal velocity of combustion effectively, thereby has improved the thermal efficiency of boiler.

The best way that the utility model is implemented is provided by the following drawings.

Accompanying drawing 1 is an outline drawing, and is horizontal, a split surface, and three grades of transmissions, (1) is electromagnetic varispeed motor, its function is to drive fire grate, and regulates fire grate speed.(2) be driving cone pulley, (3) are passive cone pulleys, and speed ratio is 2.

Accompanying drawing 2 is transmission principle sketches

The same driving cone pulley of passive cone pulley (3) (2) carries out flexible connection, implements the speed ratio of working condition requirement; The super safety protection effect of steel ball protecting device (4) connects firmly with passive cone pulley (3).Gear reducer is three grades of transmissions that are made of involute, positive-angle displacement, helical gear (5) (7) (9) and (6) (8) (10), and overall ratio is 10152.

The driving gear of first, second and third grade gear pair (steamboat) (5) (7), (9) its structure are whole conditioning shaft gears, but modification coefficient chosen and made to its modification coefficient should greater than the span of its undercut value and about 1.2 at least; Its spiral angle of graduated circle should make overlap contact ratio more than or equal to 1 at least, and to make total contact ratio be values in 2.09 scopes, and rotation direction is dextrorotation; Its facewidth should satisfy at least overlap contact ratio more than or equal to 1 and in the scope that coefficient of facewidth allows value; Its tip diameter should increase in addendum thickness is 0 lit range as far as possible, with the method that reduces addendum, makes tooth top keep required thickness.

The driven gear of first, second and third grade gear pair (bull wheel) (6), (8), (10), its structure are the former formula, and are coaxial for excessively cooperating and adding auxiliary member; Its modification coefficient should be chosen less modification coefficient and keep modification coefficient and be about 1.2 in the scope greater than its undercut limiting value at least; The same steamboat of its spiral angle of graduated circle (5), (7), (9) equal and opposite in direction, direction are opposite; Its facewidth equals the steamboat facewidth, minimumly must not be less than a normal module; Its tooth depth equals reference addendum or slightly reduces and equal its whole dedendum of the tooth; Its outside diameter circle is more than or equal to its operating pitch circle diameter; Its flange thickness equals 2 times of tooth depths at least; Its number of teeth choose the minimum centers-distance that must satisfy each requirement of strength and certain deposit is arranged; Must satisfy the required gear ratio of single-stage driving and in the error allowed band, must value greater than 10 times little tooth number and in usable range.

The centre distance of first, second and third grade gear pair equal the bull wheel outside diameter circle half, half and bottom clearance sum radially of steamboat Root diameter.

Accompanying drawing 3 is sectional drawings of steel ball protecting device.

The steel ball protecting device connects firmly on passive cone pulley.

During normal operation, on member (12), (13), (14), (15), (16) are all quiet relatively.

During improper running, input shaft (14) stops operating, passive cone pulley is still when rotating, steel ball (12) produces relative movement between coaxial (14), force steel ball (12) moving linearly that makes progress along the hole, promote tappet (15) and move upward with stroke switch contact (end provides among the figure) contact warning, motor stops operating.

Accompanying drawing 4 is sectional drawings of obstructed spindle nose

The axial clearance of the axial force that produces when belleville spring (17) can be adjusted automatically and be meshed by helical gear pair.

Accompanying drawing 5 is inputs, the sectional drawing of input spindle nose

The same outside framework oil seal of labyrinth oil seal (19) (end provides among the figure) is united use, prevents that dust from entering and preventing leakage of oil.

The axial force that belleville spring (18) produces when adjusting is meshed by helical gear pair automatically.

Accompanying drawing 6 is sectional drawings main, passive cone pulley

The groove angle of deceleration, speedup belt wheel equates, calculated diameter equates that the steamboat cornerite is all greater than 120 °.

Claims

Retarder particularly drives fire grate and regulates the big gear ratio garden stud wheel retarder of fire grate speed;

Being shaped as of this retarder is horizontal, welding casing, a split surface, parallel axes, three grades of transmissions;

This retarder is by the cone pulley arrangements for speed regulation, safety protection device, and gear reducer constitutes;

Particularly gear reducer is by involute, the positive-angle displacement, and three grades of transmissions of Helical Cylindrical Gear constitute, and it is characterized in that the little tooth number of gear pairs at different levels is respectively 2,3,4, and the single-stage driving gear ratio all constitutes greater than 10 the driving gear of nibbling out entirely.