A roller with protection at both ends

Abstract

The present invention discloses a roller with protection at both ends, wherein the left and right cover plates comprise an outer cover plate and an inner support seat; a gap is arranged between the cylindrical surface of the left and right mounting grooves and the cylindrical surface of the outer cover plate; a gap is arranged between the outer end surface of the bearing seat and the inner end surface of the outer cover plate; an annular groove-shaped air cavity is formed on the inner cylindrical surface of the inner support seat; an annular groove-shaped air outlet groove is formed on the cylindrical surface of the inner support seat close to the outer cover plate; a plurality of circumferentially uniformly distributed air guide holes are formed on the outer side wall of the air cavity; axially arranged air intake ducts are formed on the left and right end surfaces of the roller shaft; a plurality of circumferentially uniformly distributed radial air holes are formed on the inner end of the air intake duct; the outer end of the air intake duct is connected to an external air supply device; a labyrinth sealing unit is arranged between the inner support seat and the bearing.

Description

Technical Field

[0001] The invention relates to the technical field of rollers, and in particular to a roller with protection at both ends. Background Art

[0002] Rollers are important components of belt conveyors. There are many types and large quantities of them. They are used to support the belt, reduce the resistance of the belt during operation, and make the verticality of the belt not exceed a certain limit to ensure smooth operation of the belt. Therefore, the quality, waterproof and dustproof performance of the rollers are particularly important, which directly affect the service life of the rollers.

[0003] Since the roller drives the roller tube, bearing seat, bearing outer ring and sealing ring to rotate through the friction between the conveyor belt and the roller, and realizes the transmission of logistics together with the conveyor belt, the existing labyrinth seal is generally set on the roller shaft outside the bearing, and then the pressure cover is installed on the roller shaft to press the labyrinth seal. However, there is a gap between the existing pressure cover and the roller shaft and the roller, and the sealing performance is relatively poor, so the dust or water from the outside can easily enter the inner side of the pressure cover from the gap, and the dust or water can enter the bearing through the gap between the labyrinth seal and the roller shaft. A large amount of dust or water will corrode the bearing after entering the bearing, and the bearing will be damaged, resulting in a shortened service life of the bearing, so it is necessary to improve it. Summary of the invention

[0004] The purpose of the present invention is to provide a roller with protection at both ends in view of the technical problem that the sealing performance of the existing rollers is poor.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a roller with protection at both ends, comprising a roller body in the shape of a ring cylinder, a roller shaft and a pair of closed units; the pair of closed units are respectively arranged between the left end and the right end of the roller shaft and the roller body; the left end surface and the right end surface of the roller body are respectively formed with coaxially arranged left and right mounting grooves in the shape of ring grooves; the closed unit comprises a bearing seat fixed in the left and right mounting grooves; the bearing seat comprises an annular outer support portion fixed in the left and right mounting grooves and a cylindrical inner support portion formed at the inner side end of the outer support portion with an outer opening; a bearing is arranged inside the inner support portion; the outer ring of the bearing is fixedly connected to the bearing seat, and the inner ring is fixedly connected to the roller shaft; left and right cover plates are fixed to the left and right parts of the roller shaft; the left and right cover plates comprise an annular outer cover plate and an inner support seat; the outer cover plate is located at In the left and right mounting grooves; a gap is set between the cylindrical surface of the left and right mounting grooves and the cylindrical surface of the outer cover plate; a gap is set between the outer end surface of the bearing seat and the inner end surface of the outer cover plate; an annular groove-shaped air cavity is formed on the inner cylindrical surface of the inner support seat; an annular groove-shaped air outlet groove is formed on the cylindrical surface of the inner support seat close to the outer cover plate; the air outlet groove is opposite to the gap between the outer end surface of the bearing seat and the inner end surface of the outer cover plate; a number of circumferentially evenly distributed air guide holes are formed on the outer side wall of the air cavity; the outer end of the air guide hole is connected with the air outlet groove; axially arranged air intake ducts are formed on the left and right end surfaces of the roller shaft; a number of circumferentially evenly distributed radial air holes with radial openings are formed on the inner end of the air intake duct; the radial air holes are connected with the air cavity; the outer end of the air intake duct is connected to the external air supply device; a labyrinth sealing unit is set between the inner support seat and the bearing.

[0006] As a preferred embodiment of the above technical solution, a plurality of water outlet holes with inner and outer openings evenly distributed around the circumference are formed on the inner cylindrical surface of the air outlet groove; the inner end opening of the water outlet hole is away from the roller shaft, and the outer end is close to the roller shaft.

[0007] As a preferred embodiment of the above technical solution, a circular annular abutment ring is fixed to the innermost side of the bearing seat; the outer ring of the bearing abuts against the abutment ring; the inner ends of the left and right cover plates abut against the inner ring of the bearing; the left and right parts of the roller shaft are respectively formed with circular annular groove-shaped retaining ring mounting grooves; a retaining ring is installed in the retaining ring mounting groove; the outer ends of the left and right cover plates abut against the retaining ring.

[0008] As a preferred embodiment of the above technical solution, the labyrinth sealing unit includes a labyrinth inner ring fixed inside the bearing seat; the inner end of the labyrinth inner ring abuts against the outer ring of the bearing; a plurality of coaxial labyrinth ring grooves with different diameters are formed on the outer end face of the labyrinth inner ring; a plurality of annular labyrinth rings that cooperate with the labyrinth ring grooves are formed on the inner end faces of the inner support seats of the left and right cover plates.

[0009] As a preferred embodiment of the above technical solution, air inlet covers are respectively installed at the left end and the right end of the roller shaft; the air inlet covers are connected to an external air supply device.

[0010] As a preferred embodiment of the above technical solution, the air intake end cover includes a cover that cooperates with the left and right ends of the roller shaft; the left and right end faces of the roller shaft are respectively formed with cylindrical groove-shaped connecting slots; the inner end of the air intake end cover is formed with a connecting block that cooperates with the connecting slot, and the outer end face is formed with a pipe connecting column; the center of the air intake end cover is formed with an air intake hole that opens to the left and right; the air intake hole passes through the connecting block and the pipe connecting column on the left and right; a number of radial bolts evenly distributed around the circumference are screwed on the outer cylindrical surface of the air intake end cover; the inner end of the radial bolts abuts against the cylindrical surface of the roller shaft.

[0011] As a preferred embodiment of the above technical solution, the middle parts of the inner and outer side walls of the air cavity are respectively formed with coaxially arranged annular groove-shaped sealing ring placement grooves; and an annular sealing ring is arranged in the sealing ring placement groove.

[0012] The beneficial effect of the present invention is that an air wall is generated at the outer end of the bearing seat to provide protection and prevent dust and water from entering. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the cross section of the present invention.

[0014] In the figure, 10, roller body; 100, left and right mounting grooves; 20, roller shaft; 200, air inlet duct; 201, radial air hole; 202, retaining ring mounting groove; 203, connecting slot; 21, air inlet end cover; 210, air inlet hole; 211, pipe connecting column; 212, connecting plug; 30, closing unit; 31, bearing seat; 32, abutment ring; 33, bearing; 34, labyrinth inner ring; 340, labyrinth ring groove; 35, left and right cover plates; 350, air cavity; 3500, air outlet groove; 3501, air guide hole; 3502, water outlet hole; 3503, sealing ring placement groove; 351, labyrinth ring; 36, retaining ring; 37, sealing ring. DETAILED DESCRIPTION

[0015] like Figure 1As shown, a roller with protection at both ends comprises a roller body 10 in the shape of a circular cylinder, a roller shaft 20 and a pair of closed units 30; the pair of closed units 30 are respectively arranged between the left end and the right end of the roller shaft 20 and the roller body 10; the left end surface and the right end surface of the roller body 10 are respectively formed with coaxially arranged left and right mounting grooves 100 in the shape of circular grooves; the closed unit 30 comprises a bearing seat 31 fixed in the left and right mounting grooves 100; the bearing seat 31 comprises an annular outer support portion fixed in the left and right mounting grooves 100 and a cylindrical inner support portion with an outer opening formed at the inner side end of the outer support portion; a bearing 33 is arranged inside the inner support portion; the outer ring of the bearing 33 is fixedly connected to the bearing seat 31, and the inner ring is fixedly connected to the roller shaft 20; left and right cover plates 35 are fixedly fixed to the left and right parts of the roller shaft 20; the left and right cover plates 35 comprise an annular outer cover plate and an inner support seat; the outer cover plate is located in the left and right mounting grooves 100; the left and right mounting grooves 100 A gap is provided between the cylindrical surface of the bearing seat 31 and the cylindrical surface of the outer cover plate; a gap is provided between the outer end surface of the bearing seat 31 and the inner end surface of the outer cover plate; an annular groove-shaped air cavity 350 is formed on the inner cylindrical surface of the inner support seat; an annular groove-shaped air outlet groove 3500 is formed on the cylindrical surface of the inner support seat close to the outer cover plate; the air outlet groove 3500 is directly opposite to the gap between the outer end surface of the bearing seat 31 and the inner end surface of the outer cover plate; a plurality of circumferentially evenly distributed air holes are formed on the outer side wall of the air cavity 350. An air guide hole 3501 is provided; the outer end of the air guide hole 3501 is connected to the air outlet groove 3500; an axially arranged air intake duct 200 is formed on the left and right end faces of the roller shaft 20; a plurality of radial air holes 201 with radial openings uniformly distributed around the circumference are formed on the inner end of the air intake duct 200; the radial air holes 201 are connected to the air cavity 350; the outer end of the air intake duct 200 is connected to an external air supply device (not shown); a labyrinth sealing unit is provided between the inner support seat and the bearing 33.

[0016] like Figure 1 As shown, a plurality of water outlet holes 3502 with inner and outer openings evenly distributed around the circumference are formed on the inner cylindrical surface of the air outlet groove 3500 ; the inner end opening of the water outlet hole 3502 is away from the roller shaft 20 , and the outer end is close to the roller shaft 20 .

[0017] like Figure 1 As shown, a circular annular abutment ring 32 is fixed to the innermost side of the bearing seat 31; the outer ring of the bearing 33 abuts against the abutment ring 32; the inner ends of the left and right cover plates 35 abut against the inner ring of the bearing 33; the left and right parts of the roller shaft 20 are respectively formed with circular annular groove-shaped retaining ring mounting grooves 202; a retaining ring 36 is installed in the retaining ring mounting groove 202; the outer ends of the left and right cover plates 35 abut against the retaining ring 36.

[0018] like Figure 1As shown, the labyrinth sealing unit includes a labyrinth inner ring 34 fixed inside the bearing seat 31; the inner end of the labyrinth inner ring 34 abuts against the outer ring of the bearing 33; a plurality of coaxial labyrinth ring grooves 340 with different diameters are formed on the outer end face of the labyrinth inner ring 34; a plurality of annular labyrinth rings 351 cooperating with the labyrinth ring grooves 340 are formed on the inner end faces of the inner support seats of the left and right cover plates 35.

[0019] like Figure 1 As shown, air inlet covers 21 are respectively installed at the left and right ends of the roller shaft 20; the air inlet covers 21 are connected to an external air supply device (not shown).

[0020] like Figure 1 As shown, the air intake end cover 21 includes a cover that cooperates with the left and right ends of the roller shaft 20; the left and right end faces of the roller shaft 20 are respectively formed with cylindrical groove-shaped connecting slots 203; the inner end of the air intake end cover 21 is formed with a connecting plug 212 that cooperates with the connecting slot 203, and the outer end face is formed with a pipe connecting column 211; the center of the air intake end cover 21 is formed with an air intake hole 210 with left and right openings; the air intake hole 210 passes through the connecting plug 212 and the pipe connecting column 211 on the left and right; a number of radial bolts 22 evenly distributed around the circumference are screwed on the outer cylindrical surface of the air intake end cover 21; the inner end of the radial bolt 22 abuts against the cylindrical surface of the roller shaft 20.

[0021] like Figure 1 As shown, the inner and outer side walls of the air cavity 350 are respectively formed with coaxially arranged annular groove-shaped sealing ring placement grooves 3503; an annular sealing ring 37 is arranged in the sealing ring placement groove 3503.

[0022] Working principle of rollers with protection at both ends:

[0023] During operation, an external air supply device (not shown) supplies air to the air inlet 210, and the air enters the air cavity 350 through the air inlet duct 200 and the radial air hole 201, and then flows out from the air guide hole 3501 and the air outlet groove 3500, so that an air wall is generated in the gap between the outer cover plate of the left and right cover plates 35 and the cylindrical surface of the left and right installation grooves and in the gap between the outer cover plate of the left and right cover plates 35 and the outer end surface of the bearing seat 31, that is, an air wall is generated at the outer end of the bearing seat 31 for protection, and the air wall prevents dust and water from entering; at the same time, in conjunction with the labyrinth sealing unit, its sealing performance is greatly enhanced;

[0024] The existence of the water outlet hole 3502 allows the water entering before the air wall is formed to flow out under the action of the air flow during operation, further ensuring that the water will not be retained therein.

[0025] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A roller with protection at both ends, characterized in that: The invention comprises a roller body (10) in the shape of a circular cylinder, a roller shaft (20) and a pair of closed units (30); the pair of closed units (30) are respectively arranged between the left end and the right end of the roller shaft (20) and the roller body (10); the left end face and the right end face of the roller body (10) are respectively formed with left and right mounting grooves (100) in the shape of circular grooves arranged coaxially; the closed unit (30) comprises a bearing seat (31) fixed in the left and right mounting grooves (100); the bearing seat (31) comprises a bearing seat (31) fixed in the left and right mounting grooves ( 100) and a cylindrical inner support portion with an outer opening formed at the inner end of the outer support portion; a bearing (33) is arranged inside the inner support portion; the outer ring of the bearing (33) is fixedly connected to the bearing seat (31), and the inner ring is fixedly connected to the roller shaft (20); left and right cover plates (35) are fixedly fixed to the left and right parts of the roller shaft (20); the left and right cover plates (35) include an annular outer cover plate and an inner support seat; the outer cover plate is located in the left and right mounting grooves (100); the left and right mounting grooves (100) ) and the cylindrical surface of the outer cover plate; a gap is provided between the outer end surface of the bearing seat (31) and the inner end surface of the outer cover plate; an air cavity (350) in the form of an annular groove is formed on the inner cylindrical surface of the inner support seat; an air outlet groove (3500) in the form of an annular groove is formed on the cylindrical surface of the inner support seat close to the outer cover plate; the air outlet groove (3500) is directly opposite to the gap between the outer end surface of the bearing seat (31) and the inner end surface of the outer cover plate; a plurality of guide holes (3500) evenly distributed around the circumference are formed on the outer side wall of the air cavity (350). The air hole (3501) is connected to the air outlet groove (3500); the left and right end surfaces of the roller shaft (20) are formed with an axially arranged air intake duct (200); the inner end of the air intake duct (200) is formed with a plurality of radial air holes (201) with radial openings evenly distributed around the circumference; the radial air holes (201) are connected to the air cavity (350); the outer end of the air intake duct (200) is connected to an external air supply device; a labyrinth sealing unit is provided between the inner support seat and the bearing (33); A plurality of water outlet holes (3502) with inner and outer openings evenly distributed around the circumference are formed on the inner cylindrical surface of the air outlet groove (3500); the inner end opening of the water outlet hole (3502) is away from the roller shaft (20), and the outer end is close to the roller shaft (20); A circular abutment ring (32) is fixed to the innermost side of the bearing seat (31); the outer ring of the bearing (33) abuts against the abutment ring (32); the inner ends of the left and right cover plates (35) abut against the inner ring of the bearing (33); the left and right parts of the roller shaft (20) are respectively formed with circular annular groove-shaped retaining ring installation grooves (202); a retaining ring (36) is installed in the retaining ring installation groove (202); the outer ends of the left and right cover plates (35) abut against the retaining ring (36); The labyrinth seal unit comprises a labyrinth inner ring (34) fixed inside a bearing seat (31); the inner side end of the labyrinth inner ring (34) abuts against the outer ring of a bearing (33); a plurality of coaxial labyrinth ring grooves (340) with different diameters are formed on the outer side end surface of the labyrinth inner ring (34); and a plurality of annular labyrinth rings (351) matching with the labyrinth ring grooves (340) are formed on the inner side end surfaces of the inner support seats of the left and right cover plates (35).

2. The roller with protection at both ends according to claim 1, characterized in that: The left end and the right end of the roller shaft (20) are respectively provided with air intake end covers (21); the air intake end covers (21) are connected to an external air supply device.

3. The roller with protection at both ends according to claim 1, characterized in that: The air intake end cover (21) comprises a cover that matches the left and right ends of the roller shaft (20); cylindrical groove-shaped connecting slots (203) are respectively formed on the left and right end surfaces of the roller shaft (20); a connecting plug (212) that matches the connecting slot (203) is formed on the inner end of the air intake end cover (21), and a pipe connecting column (211) is formed on the outer end surface; an air intake hole (210) that opens to the left and right is formed in the center of the air intake end cover (21); the air intake hole (210) passes through the connecting plug (212) and the pipe connecting column (211) on the left and right; a plurality of radial bolts (22) that are evenly distributed around the circumference are screwed on the outer cylindrical surface of the air intake end cover (21); the inner ends of the radial bolts (22) abut against the cylindrical surface of the roller shaft (20).

4. The roller with protection at both ends according to claim 1, characterized in that: The inner and outer side walls of the air cavity (350) are respectively formed with coaxially arranged annular groove-shaped sealing ring placement grooves (3503); an annular sealing ring (37) is arranged in the sealing ring placement groove (3503).

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