CN201381108Y - Supporting roller - Google Patents

Abstract

The utility model discloses a supporting roller, which comprises a supporting roller tube, a supporting roller shaft, bearing pedestals and labyrinth sealing structures on both ends of the supporting roller tube. Each labyrinth sealing structure comprises a seal ring and a seal cover. The utility model is characterized in that: the upper edge of each bearing pedestal is provided with a positioned a flange edge; the bearing pedestals are pressed into the both ends of the supporting roller tube through adopting the method of interference fit after being coated with sealant; the seal ring is provided with a flange ring and an eraser; a seal edge 3-1 of the seal cover is assembled between the flange ring and the eraser; the thickness b of the flange ring is in the range of 0.1mm to 3mm, and the height f thereof is in the range of 2mm to 50mm; the gap c between the outer periphery of the flange ring and the seal edge 3-1 of the seal cover is in the range of 0.2mm to 2mm; the distance d from the inner surface of the flange ring to the bottom of the seal cover is in the range of 2mm to 50mm. The utility model aims at providing the supporting roller which has high concentricity, small excircle radial circular run-out, small rotation resistance and no pollution of various spraying water, bug dust, silt and even soaking for the bearing of the supporting roller after the bearing pedestals on both ends are assembled.

Description

A kind of carrying roller

Technical field

The utility model relates to a kind of job operation and hermetically-sealed construction of wheel word, especially the job operation of belt conveyer carrying roller and its hermetically-sealed construction.

Background technology

No matter the roller carrier shaft bearing that tradition adopts the interference assembly method to produce be cast iron, cold-rolling steel-plate punch, perhaps engineering plastics all need process stepped hole at carrying roller steel pipe two ends, bearing seat are pressed into to be assembled then.(Fig. 1) being the carrying roller that cast-iron chock is produced, (Fig. 2) is the carrying roller that the cold-rolling steel-plate punch bearing seat is produced, and (Fig. 3) is the carrying roller that the engineering plastic bearing seat is produced.The length of bearing seat and carrying roller steel pipe stepped hole contact surface is the 15-20 millimeter; Adopt the ram axle bearing of welding and the length of contact 2-5 millimeter (thickness of punching press steel plate) of carrying roller steel pipe stepped hole, perhaps with behind frock and the carrying roller steel pipe body location, the carrying roller (Fig. 4) that is welded then and produces.Because all there is certain out of roundness in carrying roller steel pipe itself, it is very difficult adding the concentricity that guarantees idler pipe two ends stepped hole man-hour, even adopt the stepped hole at a clamping processing of specialized equipment body two ends, also be difficult to eliminate the out of roundness that the body external diameter exists, productive costs also can improve simultaneously.Adopt the method for welding to produce carrying roller, be easy to generate error during the location, especially welding deformation is uncontrollable, also is difficult to guarantee the concentricity of idler pipe two end axles bearing, makes the curve of cyclical fluctuations of roller revolving resistance size very big.Disclose not processing step hole of a kind of idler pipe two ends, adopted the carrying roller of engineering plastic bearing seat interference Assembling Production.Though this method has guaranteed the concentricity of idler pipe two end axles bearing, also eliminated most of out of roundness that body exists, but, the carrying roller thickness of steel pipe that is adopted little (1.5-3.5 millimeter), can only satisfy underload uses, be not suitable for utilizing the thick walled steel tube manufacturing can bear the carrying roller of middle load or heavy lift, can not satisfy operating needs in a lot of occasions.

In addition, the sealing at existing carrying roller two ends, major part all is to adopt multi-form maze-type structure.But no matter which kind of labyrinth seal, all can not reach the purpose that good prevention trickle, dust are tried to plaster over the differences at the expense of principle Idler bearing is polluted, cause a lot of carrying rollers early failure to occur, influence the normal operation of belt conveyer, need the bigger driving power of configuration, cause the severe wear of energy dissipation and adhesive tape.Indivedual employing contact-type seals are also arranged, and this leak free roller revolving resistance is big, and if be entrained with the wearing and tearing of foreign material such as conny, silt in the trickle, the life-span also is very short.

The utility model content

The purpose of this utility model provides a kind of two end axles bearing assembling back concentricity height, and the cylindrical radial run-out is little, and rotational resistance is little, and various trickles, dust, silt even immersion are to the almost free of contamination carrying roller of Idler bearing.

The technical solution of the utility model is: a kind of carrying roller comprises the seal ring and the seal cover cap of idler pipe, roller carrier shaft, bearing seat, band bulge loop and scrubber.The sealing of seal cover cap is along being assemblied between bulge loop and the scrubber; The thickness b of bulge loop is the 0.1-3 millimeter, and height f is the 2-50 millimeter, the sealing of bulge loop excircle and seal cover cap along between gap c be the 0.2-2 millimeter, bottom bulge loop medial surface and the seal cover cap is the 2-50 millimeter apart from d.Sealing surpasses the lateral surface length a of bulge loop greater than 0.3 millimeter along the bottom surface.No matter bearing seat adopts engineering plastics manufacturing, steel plate stamped, cast iron manufacturing, aluminum alloy manufacturing or carbon steel material manufacturing, and the bearing seat upper edge all has the flange of locating usefulness.The idler pipe two ends do not need processing step hole, only process end face and fall interior angle, and the bearing seat interference fit idler pipe two ends that directly are pressed into place have effectively guaranteed the right alignment of two end axles bearing.Assembling roller carrier shaft, seal ring, seal cover cap more successively gets final product.Utilize the sealing of bulge loop periphery and seal cover cap to constitute the method that outermost end stops along the little gap that forms between the internal face, narrow with the thickness of bulge loop, highly big, medial surface next-door neighbour's the big labyrinth seal structure of cavity, the universal gravitation that produces between labyrinth seal circle and the seal cover cap when reducing the carrying roller rotation to greatest extent, reach and delay and even interrupt the purpose that pollutants extends, guaranteed the normal service life of carrying roller centre bearer, thereby prolonged the service life of carrying roller significantly.

Advantage of the present utility model is as follows:

1, traditional plastic conveyer roller all is to utilize the plastic pipe of extruding, and cuts off that the back produces again.Because the internal diameter size precision is disperseed, difference is big, can not satisfy matching requirements, have to join production at the body two ends laggard luggage of processing step hole.And this patent is plastic pipe or the high-frequency electric welded steel pipe that utilizes injection technique to produce, their straightness accuracy and inside/outside diameter size precision conformability are all fine, internal diameter is not processed the characteristics that just can satisfy matching requirements fully, with the two ends internal diameter is benchmark, and (value of interference fit: engineering plastic bearing seat and injection-moulding plastic pipe are 0.1-0.3 millimeter (this structure carrying roller can only satisfy underload to be used) to adopt interference fit that bearing seat is pressed into the idler pipe two ends; Metal shaft bearing and steel pipe are 0.2-0.7 millimeter (this structure carrying roller can satisfy middle load or heavy lift uses), accuracy requirement when making the right alignment of idler pipe two end axles bearing satisfy bearing to use, and guaranteed the conformability of assembly precision, make the rotational resistance of carrying roller lower about 2 times, the normal service life of having guaranteed bearing again than traditional carrying roller.

When 2, the bearing seat interference is pressed into idler pipe or plastic tube body two ends,, the cylindrical radial run-out of carrying roller is reduced significantly with the out of roundness that exists the originally round 60-70% that rises.

Disclosed plastic shaft bearing and carrying roller steel pipe interference assembling technique utilize the characteristics of the good and thin carrying roller steel pipe of wall of the plasticity of engineering plastics, have realized the effect of eliminating the steel pipe out of roundness and guaranteeing two end axles bearing concentricity.The interference assembling back idler pipe round fraction that rises, plastic shaft bearing compressive deformation major part, though carrying roller can satisfy national standard, load-carrying capacity is subjected to certain limitation; After metal shaft bearing and the carrying roller thick walled steel tube body interference assembling, the deflection of body is 60-70%, the pipe diameter that the running in bearings seat is put big 0.6 millimeter that obviously risen, load-carrying capacity all improves one to five times than above-mentioned interference assembly method, two ends processing step hole interference assembly method, steel plate ram axle bearing weld-on installation method.This being interference fitted in greatly in traditional machine up is acknowledged as the method and the technology of a kind of " unreasonable ", because make the external diameter of body that a large amount of variations take place after its assembling.But, the applicant is through discovering for a long time, exactly use the method and the technology of this " unreasonable ", can increase substantially the multinomial performance index of carrying roller: reduce cylindrical radial run-out and rotational resistance, improve load-carrying capacity, not only guaranteed the smooth running of adhesive tape, also had certain effect energy-saving and cost-reducing.

3, saved the manufacturing procedure of existing idler pipe two ends processing step hole and welding bearing seat, simplify production technology, energy savings and raw MAT'L reduce labour intensity and productive costs, have particularly avoided the malalignment that causes the bearings at both ends seat to put because of welding deformation and Mismachining tolerance.

4, behind the seal ring and seal cover cap assembly of band bulge loop, in the sealing of bulge loop outermost anchor ring and seal cover cap along formation actv. labyrinth seal structure between the internal face.The sealing of bulge loop and seal cover cap is very little along the width (bulge loop width 0.1-3 millimeter) of adjacent surface between the internal face, and the universal gravitation that is produced during rotation is also very little, and water and dust are just very slow by the speed that universal gravitation extends in labyrinth seal structure.In addition, the universal gravitation that seal ring was produced when rotating just in the sealing of bulge loop and seal cover cap along two very little adjacent surface places between the inwall, this adjacent surface is all distant apart from seal cover cap bottom, bulge loop root, the universal gravitation of generation is interrupted herein naturally, can not continue, even pollutantss such as water and dust utilize universal gravitation extend through bulge loop, also can stop naturally, extend no longer forward, therefore, the application's labyrinth seal structure has effectively stoped the pollution to Idler bearing.

5, shortened the stress point length of bearing, increased the load-carrying capacity of bearing seat, therefore can reduce the thickness of bearing seat material relatively, saved a large amount of raws MAT'L idler pipe.It is big to the stress point distance of body to have overcome traditional Idler bearing, the arm of force long (as length e among Fig. 2), the defective of intensity difference.

6, because bulge loop and seal cover cap sealing are constant along the gap between the inwall, do not change during end float misalignment, the size of shifting amount does not influence the leak free effect, brings great convenience to assembling.

When 7, carrying roller rotated, the effect of scrubber can be disposed the moving contact scar thing of the semi-fluid of falling the carrying roller end face (as: coal slime, wet slag) at any time, has avoided them to be deposited in and has extended in labyrinth seal after the carrying roller end face forms diff-H.

8, roller revolving resistance is little, bearing does not pollute, rotate flexibility ratio and do not change, the idler pipe transducer wall ' s abrasion is very slow, not only can improve the service life of carrying roller more than 10 times, and the wearing and tearing to adhesive tape also reduce several times, exempt service expenditure, the pollution that abates the noise reduces potential faults, improve safety performance, thereby the energy conservation and consumption reduction effects of whole carrying roller is reached about 50%.

Description of drawings

Fig. 1 is the idler structure figure of existing cast-iron chock and assembling,

Fig. 2 is the idler structure figure of existing ram axle bearing and assembling,

Fig. 3 is the idler structure figure of existing engineering plastic bearing seat and assembling,

Fig. 4 is the ram axle bearing of existing welding and the idler structure figure of assembling,

Fig. 5 is the idler pipe structural representation,

Fig. 6 is a cold-rolling steel-plate punch bearing block structure scheme drawing,

Fig. 7 is cast iron, aluminum alloy or carbon steel bearing holder structure scheme drawing,

Fig. 8 is an engineering plastic bearing holder structure scheme drawing,

Fig. 9 is tape erasure device and the ring structure scheme drawing that is fastened with bulge loop,

Figure 10 is tape erasure device and the ring structure birds-eye view that is fastened with bulge loop,

Figure 11 is the seal cover cap structural representation,

Figure 12 is the carrying roller assembly structure figure,

Figure 13 is a gradient seal cover cap carrying roller assembly structure figure.

Further specify the present invention below in conjunction with drawings and Examples.

Fig. 5 is idler pipe (steel pipe or a plastic pipe), only needs processing both ends of the surface and interior chamfering; Fig. 6 is the cold-rolling steel-plate punch bearing seat; Fig. 7 is cast iron, aluminum alloy or carbon steel material bearing seat; Fig. 8 is the engineering plastic bearing seat.In the bearing block structure of various materials, all have flange 12, locate with the idler pipe end face.Fig. 9, Figure 10 are tape erasure device 9 and the ring structure figure that is fastened with bulge loop 4; Figure 11 is the seal cover cap constructional drawing; Figure 12 is the carrying roller assembly structure figure, and Figure 13 is a gradient seal cover cap carrying roller assembly structure figure, and 1 is idler pipe among Figure 12 and Figure 13, the 2nd, and bearing seat.After bearing seat 2 smeared sealant, the two ends that interference is pressed into idler pipe 1 put in place (flange along 12 near idler pipe 1 end face).After reinstalling roller carrier shaft 7, bearing 6 and back-up ring 8, the seal ring 5 of band bulge loop 4 and convex scrubber 9 also smeared sealant after, interference is assembled in the bearing seat 2 cooresponding holes, interference fitting tight lid 3 on roller carrier shaft 7 again, back-up ring 8 blocks and gets final product.

The straightness accuracy of the special-purpose high-frequency electric welded steel pipe of carrying roller and the conformability of circumference wall thickness are all relatively good, the straightness accuracy and the circumference wall thickness conformability of the plastic conveyer roller body that injection moulding is produced are also fine, after the big interference of bearing seat is pressed into carrying roller steel pipe (or carrying roller plastic pipe), except most of out of roundness of body be forced to eliminate and bearing seat stressed afterwards diameter diminishes, there is not other to produce the factor of disalignment distortion, the amplitude that the stressed back of bearing seat diameter diminishes is very little, does not influence the size of bearing chamber.Therefore, the flexibility ratio of the concentricity of idler pipe two end axles bearing and bearing has all obtained reliable assurance.And the length of contact of bearing seat and idler pipe is 20 millimeter (g parts among Figure 12 and Figure 13), therefore, bearing seat is press-fit into place, and promptly can satisfy the load-carrying capacity of carrying roller.

Among Figure 12 and Figure 13, after seal ring 5 assemblings of band bulge loop 4, between bearing seat 2 and M shape seal ring 5, also stay next bigger space 10, this spatial class is like a storage room, can hold a lot of pollutantss, just in case the containment ingression seal ring, storage room can play the effect of " sheltering evil people and countenance evil practices ", thereby prolongs the time that bearing is polluted.

The pillar shape scrubber 9 of projection on the seal ring, be connected as a single entity with seal ring 5, can dispose the moving contact scar thing (as: coal slime etc.) of the various semi-fluids of falling the carrying roller end face during rotation at any time, prevent that it from piling up at the carrying roller end face, generation pressure extends in seal ring after forming diff-H, and bearing is polluted.

Among Figure 12 and Figure 13, bulge loop 4 fastens as one with seal ring 5, can adopt two bodies to be fastenedly connected and two kinds of method manufacturings of integral production.The sealing of seal cover cap is assemblied between bulge loop and the scrubber along 3-1; The thickness b of bulge loop is the smaller the better.During metallic material, can be less than 0.5 millimeter; During Plastic Parts, less than 3 millimeters, 1 millimeter is relatively good; Height f is greater than 2 millimeters, and the 4-8 millimeter is relatively good, is the bigger the better under the permission situation.If the height f of bulge loop is less than 3 millimeters, bulge loop can form certain universal gravitation when rotating, and influences sealing effectiveness; Less than 2 millimeters, sealing effectiveness gradually; During less than 1 millimeter, the universal gravitation of formation will constantly be attracted in the labyrinth seal structure pollutants in a steady stream; And design-calculated gap c is the smaller the better between the seal cover cap, and minimum 0.2 millimeter, maximum 2 millimeters, 0.2-0.5 (millimeter) is relatively good; After seal cover cap 3 assemblings, sealing must be covered the lateral surface (a place of Figure 12 and Figure 13) of (surpassing) bulge loop 4 more than 0.3 millimeter along the 3-1 length dimension.If the sealing of seal cover cap is along covering the incessantly lateral surface of bulge loop, pollutants afterwards will produce a kind of thrust that continues to the fwd pollutants, and pollutants is constantly extended toward labyrinth seal is interior in a steady stream.In addition, the length a size of covering can not change the design-calculated gap, does not influence sealing effectiveness, therefore, assembles very conveniently, has guaranteed the leak free reliability; 2 millimeters of the distance of the medial surface of bulge loop 4 and seal cover cap bottom (Figure 12 and 13 d place) minimums, the 5-10 millimeter is relatively good, and is high more good more under the permission situation.If the medial surface of bulge loop less than 2 millimeters, when bulge loop rotates, will form certain universal gravitation in the gap apart from the height of seal cover cap bottom, influence sealing effectiveness.If less than 1 millimeter, repack with grease whether in the gap no matter, the amount of filling what, what water and dust all can " without the least hesitation " extends in labyrinth seal endlessly.

After the sealing edge of seal cover cap 3 covered bulge loop 4, when bulge loop 4 rotated along with seal ring 5, the sealing of circumference and seal cover cap 3 was very little along the area of relative motion between the 3-1 inwall, and therefore, the universal gravitation of formation is very little.And, because bulge loop 4 apart from seal cover cap bottom distant apart from d, bulge loop 4 roots with seal also distant along between the 3-1 inwall apart from f, universal gravitation will interrupt.The sealing of pollutants extend through bulge loop 4 and seal cover cap 3 stops to extend along with gravitational interruption behind the adjacent surface of 3-1 inwall.

Bearing is smaller to distance (arm of force) e of bearing seat supporting steel pipe, has increased the force intensity that is subjected to of bearing seat.

Figure 13 is a gradient seal cover cap carrying roller assembly structure figure, and seal cover cap 3 top bevelings 14 shapes among Figure 13 are shown in label among Figure 13 14.Like this, when the carrying roller level is installed and used,, will flow backwards when running into the slope, extend no longer forward in case entered water.

(FR2175477A) in the patent document, a kind of sealing that has dome is disclosed.The main purpose of this technology is to prevent carrying roller in quiescence, in the containment ingression hermetically-sealed construction.But the thickness of dome is big, and is highly low, and the adjacent surface between dome and the seal cover cap is big, and little with the distance of seal cover cap bottom, seal cover cap did not cover the outside of dome yet.All can form universal gravitation when dome rotates and between seal cover cap inwall and the side, attract water or dust in labyrinth seal structure, to extend, pollute bearing then.Its structure and principle of work and present technique have basic difference.

Disclosing a kind of changed course sealing (bulge loop) structure (US4972939A) technology of also crying in addition, is that an elastomeric changed course (bulge loop) sealing is set in labyrinth sealed inside, labyrinth seal is changed into the contact-type seal structure of slight friction again.Who knows that this structure has not only increased the rotational resistance of carrying roller, and the non-constant of effect.Because if the pollutants that enters in the sealing can not be discharged, will soon the sealing overflow is stuck, carrying roller can not be rotated.There is very big leak in its structure.

As everyone knows, the labyrinth sealed gap is big more, and the leak free effect is poor more.Therefore, the sealing effectiveness of the technical personnel of the sector in order to obtain, the distance of as far as possible dwindling labyrinth sealed gap and prolongation (increase) labyrinth.Think that all the gap is more little, labyrinth long more (many more), the leak free effect is good more.Who does not know that this is very big mistaken ideas of labyrinth seal principle.The applicant proves that through long-time test the labyrinth sealed gap is more little, and continuous is long more, and the universal gravitation that produces during rotation is big more, and the speed that pollutants extends is also just fast more.As long as pollutants has passed through labyrinth, first road, and universal gravitation does not interrupt, will be always than extending faster, and the labyrinth packing how to grow all is useless.Therefore, utilize the outermost locations, size, the length that change seal clearance, the labyrinth seal of method such as structure or shape design-calculated, though the speed of containment ingression or extension and the time that finally pollutes bearing are distinguished to some extent but are all undesirable, moreover a lot of the prolongation pollutes the bearing time method, be in the labyrinth structure of little seal clearance, length, to fill a large amount of greases, bring with the rotational resistance that significantly increases carrying roller.That is to say that the sealing resultant effect that the little ratio gap in labyrinth seal gap is big is not good too many.Therefore, applicant adopts sealing at bulge loop 4 outermost anchor rings and seal cover cap along the little gap that forms between the 3-1 internal face, constitute the labyrinth seal method that outermost (first road) stops, utilize the little adjacent surface (in Figure 12 and 13 width of b little) of the sealing of seal cover cap along 3-1 inwall and bulge loop 4 circumference, big distance (height of f is big) with the bulge loop bottom, and bulge loop medial surface next-door neighbour's big cavity 13 (label 13 places among Figure 12 and 13, the size of this big cavity is decided by medial surface two sizes of height f apart from d and bulge loop bottom seal cover cap of bulge loop 4.General d and f are greater than 2 millimeters, d is that 5-10 (millimeter), f are that 4-8 (millimeter) is relatively good, and be the bigger the better) labyrinth seal structure that combines, (b among Figure 12 and 13 is more little for the universal gravitation minimum that forms when bulge loop 4 is rotated, f and d are big more, the universal gravitation that forms when bulge loop rotates is more little, sealing effectiveness is just good more), pollutants can interrupt when arriving before the big cavity naturally, it is very slow to receive that just pollutants extends, having no progeny in universal gravitation stops to extend, and does not pollute the desirable seal effect of Idler bearing.In sum, what need stress is that labyrinth seal must be interrupted universal gravitation in outermost sealing place (being bulge loop 4 periphery places), makes pollutants stop to extend.Otherwise, pollutants from outermost sealing enter the back just can not withdraw again, at this time stop again or other setting just nonsensical.Pollutants is not that the sealing overflow is stuck, is exactly that bearing is stuck, even the grease that filling is many or few in seal clearance is also of no avail.The common fault that traditional labyrinth seal that Here it is exists.Utilizing the little gap of outermost to stop, be close to the method that big cavity interrupts universal gravitation, makes pollutants stop to extend in outermost labyrinth seal place, also has been that the principle first since labyrinth seal is used is found.This labyrinth seal structure is not limited only to the idler structure of present patent application, also applicable to the wheel word of other similar structures.If the bigger wheel word of diameter, the size of a, b, d, f all needs to increase in the hermetically-sealed construction.

As Figure 12 and shown in Figure 13, in the sealing of bulge loop 4 and seal cover cap 3 inboard along adjacent surface, scribbling grease, is known in order to the gap of filling up both adjacent surfaces, and " barrier wall " 11 comes block contaminant to enter hermetically-sealed construction because grease can utilize the viscosity of self to form together.Test discovery through the applicant, what of repack with grease in the sealing have a significant impact the rotational resistance of carrying roller.For the pollutants of trickle and dust formation, the sealing structure is coated with a spot of grease in the sealing of bulge loop 4 medial surfaces and seal cover cap 3 along 3-1 adjacent surface place, just can play good barrier effect.Because next-door neighbour's bulge loop 4 medial surfaces are big cavitys 13, it is movable along with the rotation of bulge loop to have only by the grease of bulge loop 4, grease at a distance remains static when bulge loop rotates, therefore, the shape major part of " barrier wall " 11 can guarantee constant, can play good barrier effect to trickle little at universal gravitation, that extension trend is faint and dust.In addition, the sealing by bulge loop 4 and seal cover cap 3 of trickle or dust is during along 3-1 adjacent surface place, and the barrier effect along with gravitational interruption and " barrier wall " 11 also just stops to extend forward, remains static.Therefore, another outstanding characteristics of " barrier wall " 11 are in the big cavity 13, because its contact surface with bulge loop 4 is little, it is very little to produce the resistance of adhering when bulge loop is rotated, just very little to the influence of roller revolving resistance.Utilize this labyrinth seal structure and the above-mentioned high carrying roller of producing of idler pipe two end axles bearing concentricity, through the test rotational resistance is 0.65N-1.35N (index of rotational resistance is 2.5N-3.5N in our the national and present in the world carrying roller standard), and bearing can remain good lubricating.All reach (load difference about 150,000 hours the service life of carrying roller centre bearer, life-span is distinguished to some extent), if wear-resisting, the withstanding corrosion of idler pipe and corrosion performance also are guaranteed, so, in various contaminated environment, use present technique, just can remove traditional carrying roller " cap of consumable accessory ".And, reduce the wearing and tearing of conveyor belt running, the loss of the energy, the expense of maintenance, the pollution of noise, the wearing and tearing and the various potential accident potential of cylinder significantly, overall economic efficiency and social benefit are significantly improved.

When carrying roller need soak use, can fill full grease at big cavity 13 places between bulge loop 4 and seal cover cap 3 bottoms.Because most of grease is distant apart from bulge loop 4, most of grease remained static when bulge loop rotated, and can play the effect of good block water.Make water under the little situation of pressure, it is also very slow to enter leak free speed, almost is zero.Through test, when grease was expired in filling in the big cavity, the rotational resistance of carrying roller also was no more than 1.5N.

The carrying roller assembly structure figure is only narrated an end, and other end structure is identical.

Claims (10)

1, a kind of carrying roller comprises the labyrinth seal structure at idler pipe (1), roller carrier shaft (7), bearing seat (2) and idler pipe two ends, and labyrinth seal structure comprises seal ring (5) and seal cover cap (3); It is characterized in that: the bearing seat upper edge has the flange (12) of location, after bearing seat is smeared sealant, adopts interference fit method to be pressed into the two ends of idler pipe (1); On seal ring, be provided with bulge loop (4) and scrubber (9); The sealing of seal cover cap is assemblied between bulge loop and the scrubber along (3-1); The thickness of bulge loop (b) is the 0.1-3 millimeter, and highly (f) is the 2-50 millimeter, and bulge loop excircle and seal cover cap sealing are the 0.2-2 millimeter along the gap (c) between (3-1), and the distance (d) of bulge loop medial surface and seal cover cap bottom is the 2-50 millimeter.

2, carrying roller according to claim 1 is characterized in that: after the seal cover cap assembling, sealing surpasses the lateral surface length (a) of bulge loop (4) greater than 0.3 millimeter along (3-1) bottom surface.

3, carrying roller according to claim 1 is characterized in that: scrubber (9) is more than one convex column.

4, carrying roller according to claim 1 is characterized in that: bearing seat adopts the engineering plastics manufacturing, and idler pipe is the injection-moulding plastic pipe, and value of interference fit is the 0.1-0.3 millimeter;

5, carrying roller according to claim 1 is characterized in that: bearing seat adopts steel plate stamped, cast iron manufacturing, aluminum alloy manufacturing or carbon steel material manufacturing, and idler pipe is a high-frequency electric welded steel pipe, and value of interference fit is the 0.2-0.7 millimeter.

6, carrying roller according to claim 1 is characterized in that: seal ring is the interference of M shape and is assembled on the bearing seat, forms a bigger space storage room (10) between itself and the bearing seat corresponding surface; The bulge loop medial surface on the seal ring and the sealing of seal cover cap scribble grease (11) along (3-1) adjacent surface place, and seal cover cap (3) interference is assembled on the roller carrier shaft (7).

7, carrying roller according to claim 1 is characterized in that: idler pipe (1) two ends processing end face and interior chamfering.

8, carrying roller according to claim 7 is characterized in that: the seal cover cap sealing is gradient face (14) along the top of (3-1).

9, carrying roller according to claim 1 is characterized in that: metal shaft bearing and carrying roller steel pipe body contact surface scribble sealant during assembling, and the contact surface of seal ring and bearing seat also scribbles sealant.

10, carrying roller according to claim 1 is characterized in that: bulge loop (4) can adopt two bodies to be fastenedly connected and two kinds of method manufacturings of integral production with seal ring (5).

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