CN104495674A - Closed type heavy-load thin wall light-duty pulley device - Google Patents

Abstract

The invention provides a closed type heavy-load thin wall light-duty pulley device and belongs to the technical field of heavy industrial machinery. The device comprises an end cover, a wheel hub, two webs and a rope groove which are annular and are connected in sequence from inside to outside, and further comprises a shaft which is arranged inside an inner ring of the end cover, a bearing for supporting the shaft and an inner ring supporting sleeve for positioning the bearing. The two webs are located at the positions on the two side faces of the pulley device and are at the same radial position of the pulley device. The wheel hub and the end cover are fixed by a stainless steel wire rope; an outer ring of the end cover is connected with the wheel hub; a gap being not more than 0.1mm is formed between the inner ring of the end cover and the inner ring supporting sleeve. An inner cavity composed of the wheel hub, the end cover, the inner ring supporting sleeve and the shaft is fully filled with lubricating grease to form a closed structure. The closed type heavy-load thin wall light-duty pulley device is free of maintenance; the lubricating grease can be fully filled in one time and does not need to be replaced within 4-5 years; meanwhile, the pulley device which has lighter self weight, greater load and smaller wall thickness is effectively realized and the service life of the pulley device is greatly prolonged.

Description

The light-duty pulley gear of dead front type heavy-load thin-wall

Technical field

The invention belongs to heavy industry field of mechanical technique, relate to a kind of pulley gear.

Background technology

As everyone knows, pulley is the accompaniment of steel rope, and steel rope relies on pulley bearing to realize various motion.According to related data, World Steel output 0.3% for the manufacture of steel rope (about 4,000,000 tons).Can know by inference thus, although pulley is durable industrial goods, not need periodic replacement like that like steel rope, need the pulley newly put or upgrade to be still a huge numeral every year in the world.In the world the various pulley of size in 1,000,000, also to increase hundreds thousand of every year, only China's year needs big-and-middle-sized pulley (wouldn't count small sheave, plastic pulley) more than 200,000, and about over one hundred family of professional production factory is the commodity that there is not little requirement in market.

Though the substantially competent different operating mode work of existing pulley, exists common drawback: first deadweight is bigger than normal, especially in the operating mode of high-speed overload Fraquent start, because of from great, rotor inertia large, can strengthen moment of flywheel and be unfavorable for rapid starting, power consumption is greatly.It two is when steel cable cornerite is little, and because own wt is large, rotor inertia is large, rises between braking moment pulley and steel cable and can produce micro-slip, wear and tear larger.It three is need intermittent oiling to maintain, and carries out regular servicing tool with operating condition by restriction (high-altitude, crane arm termination, stenosis etc.) out of doors and acquire a certain degree of difficulty.

Therefore, how improving pulley quality, extend its service life, reduce its maintenance work amount, reduce its weight, especially reduce its weight and rotor inertia when heavy duty, is the problem constantly studied for many years of researcher in the industry.

Summary of the invention

The pulley gear that object of the present invention mainly provides a kind of heavy-load thin-wall light-duty; It is little that next is to provide a kind of maintenance work amount, the pulley gear of long working life.

In order to achieve the above object, solution of the present invention is:

The light-duty pulley gear of a kind of dead front type heavy-load thin-wall, comprises the end cap being ring-type, wheel hub, two blocks of webs and the grooving that connect successively from inside to outside; Also comprise the axle within the inner ring being positioned at described end cap, support the bearing of described axle and locate the inner ring spider of described bearing; Described two blocks of webs are in the position of the two sides of described pulley gear, and are in identical radial position on described pulley gear; Described wheel hub and described end cap are fixed by corrosion-resistant steel wire ring, and the outer ring of described end cap is connected with described wheel hub, have the gap being not more than 0.1 millimeter between the inner ring of described end cap and described inner ring spider; Grease is full of, to form enclosed construction in the inner chamber that described wheel hub, end cap, inner ring spider and axle are formed.

On described two blocks of webs, correspondence is provided with more than one convex tendon, and described convex tendon is on the concentric circles of edge circle of described web, and equidistantly arranges along described concentric circles; Have through hole between described convex tendon, described through hole to be also on described concentric circles and equidistantly to arrange; Described two blocks of webs are linked together by the poling be arranged between corresponding through hole; Described grooving, wheel hub, two blocks of webs, and poling connects into closed box-structure.

Described grooving is made by machinework, reaches HRC38-62 to make the superficial hardness of described grooving.

The weight of described pulley gear meets:

$M\≤276.9\×{\left(\frac{D}{1000}\right)}^2-200.7\×\left(\frac{D}{1000}\right)+58$

Wherein, M is the weight of described pulley gear, and unit is kilogram; D is diameter of pulley, and unit is millimeter, and D is more than or equal to 400 millimeters and is less than or equal to 1800 millimeters here.

The wall thickness of described pulley gear and the thickness of described web meet: when diameter of pulley is more than or equal to 400 millimeters and is less than 900 millimeters, the wall thickness of described pulley gear is (5 ± 0.5) millimeter; When diameter of pulley is more than or equal to 900 millimeters and is less than 1400 millimeters, the wall thickness of described pulley gear is (6 ± 1) millimeter; When diameter of pulley is more than or equal to 1400 millimeters, the wall thickness of described pulley gear is (8 ± 1) millimeter.

The load-carrying capacity of described pulley gear meets:

$T\≥20.1\×{\left(\frac{D}{1000}\right)}^2+4.9\×\left(\frac{D}{1000}\right)-1.45$

Wherein, T is the load-carrying capacity of described pulley gear, and unit is ton; D is diameter of pulley, and unit is millimeter, and D is more than or equal to 400 millimeters and is less than or equal to 1800 millimeters here.

Owing to adopting such scheme, the invention has the beneficial effects as follows: the light-duty pulley gear of inventive closure type heavy-load thin-wall adopts such scheme, can effectively realize non-maintaining function, disposablely fill it up with grease, 4-5 does not need to change.Adopt machinework due to grooving and make Surface hardened layer, so grooving carrying antiwear property improves greatly, and the wearing and tearing to steel rope can be reduced, therefore can extend the life-span of pulley and steel rope.Web adopts surperficial beading, is weldingly connected between two web with poling, two web, grooving, wheel hub, and poling connects into closed box-structure, improves load-carrying capacity and the resistance to compression stability of pulley.Therefore, pulley load-carrying capacity and be greatly improved service life.

Accompanying drawing explanation

Fig. 1 a is the front view of embodiment of the present invention middle pulley structure;

Fig. 1 b is the lateral plan of embodiment of the present invention middle pulley structure;

Fig. 2 is grooving precision measure schematic diagram in the embodiment of the present invention;

Fig. 3 a is the front view of the light-duty pulley gear of dead front type heavy-load thin-wall in the embodiment of the present invention;

Fig. 3 b is the lateral plan of the light-duty pulley gear of dead front type heavy-load thin-wall in the embodiment of the present invention;

Fig. 3 c is the cutaway view at A-A visual angle in Fig. 3 a;

Fig. 3 d is the enlarged drawing of institute's circle part in Fig. 3 b;

Fig. 4 is that in the embodiment of the present invention, the light-duty pulley gear of dead front type heavy-load thin-wall is arranged on the schematic diagram on pulley yoke.

Accompanying drawing illustrates: 1, grooving; 2, web; 3, poling; 4, wheel hub; 5, end cap; 6, screw; 7, inner ring spider; 8, bearing; 9, locking bead coil; 10, bearing spacer; 11, axle; 12, convex tendon; 13, pulley yoke.

Detailed description of the invention

Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.

For the problems that existing pulley causes because sole mass is comparatively large, the present invention proposes the light-duty pulley gear of a kind of dead front type heavy-load thin-wall, this pulley gear comprises the parts such as pulley structure and the axle that is mated.Fig. 1 a is the front view of this pulley gear middle pulley structure, and Fig. 1 b is its cutaway view.This pulley structure comprises the wheel hub 4, web structure 2 and the grooving 1 that are ring-type.Wheel hub 4, web structure 2 and grooving 1 are nested successively from inside to outside and be welded to connect.

Web structure 2 comprises two blocks of webs; Grooving 1, wheel hub 4 close inner ring and the outer ring of these two blocks of webs, these two blocks of webs are formed and closes box-structure.These two blocks of webs are in the position of the two sides of pulley gear, and are in identical radial position on this pulley gear.The cross section of this web structure 2 is trapezoidal, and two blocks of webs are in the position of these two trapezoidal waists.

On two blocks of webs, equal correspondence is welded with three convex tendons 12, and these three convex tendons 12 are on the concentric circles of edge circle of place web, and equidistantly arrange along this concentric circles.Between every two convex tendons 12, there is a through hole, have three through holes, these three through holes be also in place web edge circle concentric circles on and equidistantly arrange.Two blocks of webs are linked together by the poling 3 be arranged between corresponding through hole.

Above-mentioned poling 3 connects two blocks of webs of web structure 2, serves the effect greatly strengthening this box web structure 2 intensity together with convex tendon 12.Thus web structure 2 is when pulley gear runs, and for the Tensile or Compressive Loading that circulation occurs, above-mentioned poling 3 and convex tendon 12 can keep its stablizing under dynamic load.Test proves, under the steel cable Breaking load of applying 120%, it can keep stable, and only considering that the safety factor in Web Stability situation can reach more than 6, safety is very strong.

Grooving 1 is similarly ring bodies structure, and the radius of its inner ring equals the radius of the outer ring of web structure 2.The cross section of grooving 1 is then U-shaped, and U-shaped opening outwardly, and U-shaped bottom welding connects the face, outer ring of web structure 2, and therefore this grooving 1 has cell body toward the outer side, for accommodation rope body.Grooving 1 be applicable to diameter from arrive the steel rope of (unit is millimeter), the ratio of grooving diameter and wirerope diameter is not less than 30, and its opening width is about 50 degree, meets national standard.The hardness of grooving 1 then according to the wear-resisting requirement of load and different operating mode, is obtained by different materials and Technology for Heating Processing.In the present embodiment, this grooving is made by machinework, and its superficial hardness reaches HRC38-62.

Have on the basis of above-mentioned box web at pulley gear, according to the difference of diameter of pulley, the thickness (being defined as the wall thickness of this pulley gear in the present invention) of web is as follows:

When diameter of pulley is more than or equal to 400 millimeters and is less than 900 millimeters, the thickness of web is (5 ± 0.5) millimeter; When diameter of pulley is more than or equal to 900 millimeters and is less than 1400 millimeters, the thickness of web is (6 ± 1) millimeter; When diameter of pulley is more than or equal to 1400 millimeters, the thickness of web is (8 ± 1) millimeter.

In prior art, for the pulley gear of heavy duty, in view of bearing web stress very complicated (tension and compression alternately occur), existing mechanics of elasticity method of calculating is difficult to accurately calculate its desired thickness.Therefore, for the sake of security, all get higher value, cause pulley weight to remain high.And the box web structure in the present embodiment makes web thickness can value in the manner described above, the value foundation of above-mentioned web thickness is that the method adopting theory calculate to combine with test cell overload test obtains scientific results, than conventional hot rolling or casting pulley about gently 20-50% under the prerequisite ensureing pulley gear safety, microlight-type structure comparatively speaking, its deadweight and rotor inertia reduce greatly (reducing 50-100% than with diameter of pulley conventional pulley wheel rotor inertia), not only be conducive to starting rapidly and braking, be also conducive to reducing supporting complete machine weight.

In order to control the manufacturing cost of this pulley gear, its precision is divided into three kinds of different grades.Fig. 2 is its precision measure position view.Three kinds of class of accuracys are as shown in table 1 below:

Table 1 pulley level error table (unit: millimeter)

To sum up, this pulley gear adopts above-mentioned box web structure, the thickness of web structure median ventral plate is different according to the difference of grooving diameter (i.e. diameter of pulley), pulley structure is formed by grooving, box web structure and hub welding, achieve the microlight-type structure under guarantee heavy-duty safety prerequisite, eliminate conventional pulley structure because of the excessive variety of problems caused of conducting oneself with dignity; Meanwhile, in pulley structure, grooving has suitable hardness and precision as required, and have good antiwear property, service life is longer.

The light-duty pulley gear of inventive closure type heavy-load thin-wall is except comprising above-mentioned pulley structure, axle 11 within the end cap 5 also comprising the ring-type within the inner ring being in wheel hub 4, the inner ring being positioned at end cap 5, supports the bearing 8 of this axle 11 and locates the inner ring spider 7 of this bearing 8.Fig. 3 a is the front view of this device; Fig. 3 b is its lateral plan; Fig. 3 c is A-A visual angle section-drawing in Fig. 3 b; Fig. 3 d is the enlarged drawing of institute's circle part in Fig. 3 b.Therefrom can find out, the outer ring of two end caps 5 all connects wheel hub 4, has the gap being not more than 0.1 millimeter between inner ring and inner ring spider 7; Being specially end cap 5 and containing mounting groove near the outer ring of wheel hub 4 and wheel hub 4 near inner ring, connecting end cap 5 and wheel hub 4 by arranging ring-type stainless steel wire in this mounting groove.Thus wheel hub 4, end cap 5, inner ring spider 7 and axle 11 surround the structure forming and have inner chamber; Bearing 8 is positioned at this inner chamber.In the present embodiment, comprise two bearings 8 altogether, axle 11 is positioned on these two bearings 8, separates between these two bearings 8 with bearing spacer 10.

In order to reduce maintenance difficulties and the cost of above-mentioned pulley gear, its inner chamber formed is closed in the measure that the present embodiment is taked to greatest extent.Except passing through the improvement of said structure, also in this inner chamber (comprising above-mentioned gap), fill grease, the cone penetration of this grease is 150 to 170.This grease adopts the lithium base grease through special processing and increases molybdenum disulphide special additive, thus makes cone penetration reach above requirement.In view of world's handling machinery now uses the speed of pulley not high, substantially all at about 100 rpms, belong to low speed type, during operation, inner heat-dissipating is very little, so the lithium base grease that employing cone penetration is about 150 can realize degree of closure required for the present invention.

Conventional pulley is equipped with oil hole on axle and wheel hub, by oil hole more oil change.In the present embodiment, in order to improve the leak tightness of pulley gear, wheel hub 4 is entity structure, is also entity structure, wheel hub 4 and axle 11 all do not have oil hole with the matching used axle 11 of wheel hub 4.The oil hole of this pulley gear is arranged in end cap 5, is the through hole that end cap 5 is arranged, and by bolt shutoff, for during for overhaul and cleaning.Except the improvement in leak tightness, do not establish oil hole to make the production technology of wheel hub 4 and axle 11 in the present embodiment more simple, oil hole is arranged on end cap 5 and makes oil circuit apart from short, conveniently rush oil.

The weight of the light-duty pulley gear of inventive closure type heavy-load thin-wall (being 30 at diameter of pulley and wirerope diameter ratio, when " mechanical design handbook (the 5th edition) " that bearing selection gist Cheng great Xian edits selects cylindrical roller bearing) meets:

$M\≤276.9\×{\left(\frac{D}{1000}\right)}^2-200.7\×\left(\frac{D}{1000}\right)+58$

Wherein, M is the weight of described pulley gear, and unit is kilogram; D is diameter of pulley, and unit is millimeter, and D is more than or equal to 400 millimeters and is less than or equal to 1800 millimeters here; When diameter of pulley is greater than 1800 millimeters, this formulae discovery weight also can do reasonable reference.

The wall thickness of this pulley gear and the thickness of web, with consistent before, can meet: when diameter of pulley is more than or equal to 400 millimeters and is less than 900 millimeters, and the wall thickness of pulley gear is (5 ± 0.5) millimeter; When diameter of pulley is more than or equal to 900 millimeters and is less than 1400 millimeters, the wall thickness of pulley gear is (6 ± 1) millimeter; When diameter of pulley is more than or equal to 1400 millimeters, the wall thickness of pulley gear is (8 ± 1) millimeter.

The load-carrying capacity of pulley gear meets:

$T\≥20.1\×{\left(\frac{D}{1000}\right)}^2+4.9\×\left(\frac{D}{1000}\right)-1.45$

Wherein, T is the load-carrying capacity of pulley gear, and unit is ton; D is diameter of pulley, and unit is millimeter, and D is more than or equal to 400 millimeters and is less than or equal to 1800 millimeters here; When diameter of pulley is greater than 1800 millimeters, this formulae discovery weight also can do reasonable reference.

Fig. 4 is arranged on the schematic diagram on pulley yoke when being the use of this pulley gear; Wherein, 13 is pulley yoke.

In order to the weight of middle pulley device of the present invention and the weight of conventional pulley device are compared, design traditional pulley according to " mechanical design handbook (the 5th edition) " of Cheng great Xian chief editor below, cylindrical roller bearing elected as by bearing, diameter of pulley and wirerope diameter ratio also get 30 with ensure load-carrying capacity and pulley of the present invention consistent.The weight of conventional pulley body below for calculating

$M=506.9\×{\left(\frac{D}{1000}\right)}^2-384.2\×\left(\frac{D}{1000}\right)+96$

Contrast pulley gear weight of the present invention known, the weight of pulley gear of the present invention is less than the weight of this pulley gear, and along with the increase of diameter of pulley, gap is more remarkable.This means that the pulley gear in the present invention is lighter than traditional pulley gear when identical bearing type, identical diameter of pulley and wirerope diameter ratio.Obviously, when weight is identical, the diameter of pulley in the present invention will be greater than the diameter of pulley of conventional pulley device, the wirerope diameter that is suitable for also be greater than the latter, so when weight is identical, pulley gear bearing capacity of the present invention is greater than conventional pulley.In addition, middle pulley device of the present invention comprises the closed box-structure that grooving, wheel hub, two web and poling are linked to be, and intensity, rigidity, stability all exceed traditional pulley gear, and therefore pulley quality of the present invention is light, and bearing capacity is large.

In above-mentioned pulley gear, end cap seal, does not adopt Rubber Parts, does not thus have problem of aging; Without screw fastening, but fix with corrosion-resistant steel wire ring, thus structure is very compact.Meanwhile, inner chamber and the extraneous air of wheel hub, end cap and axle composition are isolated substantially, make dirt, moisture, salt fog etc. be difficult to enter.In addition, the solid grease of this device, substantially without cavity, therefore when the temperature is changed, can not bring dust, moisture, salt fog etc. into because of the respiration of air.Also just based on said structure, the clean and environmental friendliness of this device.This pulley gear is when producing, and once sufficient grease, makes it sustainable work 7-8, have non-maintaining advantage, has greatly saved and has safeguarded the cost produced.

Above-mentioned is can understand and apply the invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to embodiment here, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.

Claims (4)

1. the light-duty pulley gear of dead front type heavy-load thin-wall, is characterized in that: comprise the end cap being ring-type, wheel hub, two blocks of webs and the grooving that connect successively from inside to outside; Also comprise the axle within the inner ring being positioned at described end cap, support the bearing of described axle and locate the inner ring spider of described bearing; Described two blocks of webs are in the position of the two sides of described pulley gear, and are in identical radial position on described pulley gear;

Described wheel hub and described end cap are fixed by corrosion-resistant steel wire ring, and the outer ring of described end cap is connected with described wheel hub, have the gap being not more than 0.1 millimeter between the inner ring of described end cap and described inner ring spider; Grease is full of, to form enclosed construction in the inner chamber that described wheel hub, end cap, inner ring spider and axle are formed.

2. the light-duty pulley gear of dead front type heavy-load thin-wall according to claim 1, it is characterized in that: on described two blocks of webs, correspondence is provided with more than one convex tendon, described convex tendon is on the concentric circles of edge circle of described web, and equidistantly arranges along described concentric circles; Have through hole between described convex tendon, described through hole to be also on described concentric circles and equidistantly to arrange; Described two blocks of webs are linked together by the poling be arranged between corresponding through hole; Described grooving, wheel hub, two blocks of webs, and poling connects into closed box-structure.

3. the light-duty pulley gear of dead front type heavy-load thin-wall according to claim 1, is characterized in that: described grooving is made by machinework, reaches HRC38-62 to make the superficial hardness of described grooving.

4. the light-duty pulley gear of dead front type heavy-load thin-wall according to claim 1, is characterized in that: the weight of described pulley gear meets:

$M\≤276.9\×{\left(\frac{D}{1000}\right)}^2-200.7\×\left(\frac{D}{1000}\right)+58$

Wherein, M is the weight of described pulley gear, and unit is kilogram; D is diameter of pulley, and unit is millimeter, and D is more than or equal to 400 millimeters and is less than or equal to 1800 millimeters here;

The wall thickness of described pulley gear and the thickness of described web meet: when diameter of pulley is more than or equal to 400 millimeters and is less than 900 millimeters, the wall thickness of described pulley gear is (50.5) millimeter; When diameter of pulley is more than or equal to 900 millimeters and is less than 1400 millimeters, the wall thickness of described pulley gear is (61) millimeter; When diameter of pulley is more than or equal to 1400 millimeters, the wall thickness of described pulley gear is (81) millimeter;

The load-carrying capacity of described pulley gear meets:

$T\≥20.1\×{\left(\frac{D}{1000}\right)}^2+4.9\×\left(\frac{D}{1000}\right)-1.45$

Wherein, T is the load-carrying capacity of described pulley gear, and unit is ton; D is diameter of pulley, and unit is millimeter, and D is more than or equal to 400 millimeters and is less than or equal to 1800 millimeters here.