Full-effect Sealed Energy-saving and Silent Idler

Abstract

Full-effect sealed energy-saving silent idler, with an idler and bearing seats on both sides. Full-effect sealed energy-saving silent bearings are provided in the bearing seats. One end face of the full-effect sealed energy-saving silent bearing is provided with a labyrinth seal structure. The inlet of the labyrinth seal structure is provided with a V-shaped inlet reverse seal structure, and the opening faces the inlet of the labyrinth seal structure. The outlet of the labyrinth seal structure is provided with a V-shaped outlet reverse seal structure. One branch extends reversely to block the inlet of the labyrinth seal structure, and the other branch reversely blocks the connection port between the labyrinth seal structure and the cage. The inner sealing lip of the single-layer contact seal ring on the other side is arranged in the inner ring groove of the bearing. The cage is made of engineering plastic. The labyrinth seal structure is a channel formed by a pair of buckled outer and inner seal rings. The bearing seat has an outward-expanded shoulder, and a sealing cover is provided. There is a water-throwing gap between the sealing cover and the shoulder. This idler has low noise, does not admit impurities, does not leak oil, saves costs, has a large load-bearing capacity and runs more smoothly.

Description

Technical Field

[0001] The invention belongs to the technical field of idlers in the field of mechanical manufacturing, and particularly relates to a full-effect sealed energy-saving silent idler. Background Art

[0002] In a belt conveyor, especially a large belt conveyor used in coal mines, the idler is one of the important components. The function of the idler is to support the weight of the conveyor belt and the materials. The idler must run flexibly and reliably, reduce the friction between the conveyor belt and the idler, and play a key role in the service life of the conveyor belt, which accounts for more than 25% of the total cost of the conveyor. When the idler runs, the outer ring of the bearing rotates, while the inner ring is relatively stationary. The belt conveyor has a low speed, and the bearing and the idler need to have a large load-bearing capacity.

[0003] The existing idler and the original sealed bearing 23 include as Figure 1 and Figure 2 shown: When using a sealed bearing, multiple seals (such as isolation rings 22, original sealed bearings 23, retaining rings 24, outer seal rings 25, inner seal rings 26, end covers, shaft covers, and other various seals and their combined forms) are required, resulting in high manufacturing costs, complex assembly, large weight, and high labor consumption.

[0004] When using multiple seals, the original bearing seat 27 is in the shape of a long straight cylinder, and the original sealed bearing 23 is located deep in the original bearing seat 27, resulting in poor load-bearing capacity of the bearing idler.

[0005] The original sealed bearing 28 uses a rubber and skeleton seal structure (single-layer rubber contact seal structure 8). The seal lip structure is simple and is easily lifted to let in water, sediment, air, impurities, etc., and the seal lip is also easily lifted to leak oil.

[0006] The metal cage of the bearing is prone to heat generation and noise, and the end face of the bearing is prone to rust. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: in view of the deficiencies of the prior art, a full-effect sealed energy-saving silent idler equipped with a silent energy-saving bearing is provided, which is silent, energy-saving, light in weight, and has a better sealing effect.

[0008] The technical solution adopted is: a full-effect sealed energy-saving silent idler, which has an idler and bearing seats fixed on both sides of the idler. A full-effect sealed energy-saving silent bearing is arranged in each bearing seat.

[0009] The full-effect sealed energy-saving silent bearing includes an inner bearing ring, an outer bearing ring, a cage, and a plurality of balls. A cage is arranged between the inner bearing ring and the outer bearing ring, and balls are placed in the pocket holes of the cage. One end face of the full-effect sealed energy-saving silent bearing is provided with a single-layer rubber contact seal structure.

[0010] The technical key points are as follows: A labyrinth seal structure is provided on the other end face of the full-effect sealed energy-saving silent bearing. An inlet reverse seal structure is provided at the inlet of the labyrinth seal structure. An outlet reverse seal structure is provided at the outlet of the labyrinth seal structure. The inner ring of the bearing is fixed on the support shaft. The inner sealing lip of the single-layer contact seal ring is arranged in the groove of the inner ring of the bearing. The cage is made of engineering plastic. The labyrinth seal structure includes a labyrinth seal channel formed by a snap-on outer seal ring and inner seal ring. The inlet reverse seal structure is V-shaped, with the opening facing the inlet of the labyrinth seal. The outlet reverse seal structure is V-shaped, with one branch extending reversely to block the inlet of the labyrinth seal structure and the other branch reversely blocking the connection port between the labyrinth seal structure and the cage. The outer seal ring includes an integrally structured outer seal ring annular part and inner and outer flanges of the outer seal ring bent on both sides. The outer seal ring is fixedly connected to the inner ring of the bearing. The inner seal ring includes an integrally structured inner seal ring annular part and inner and outer flanges of the inner seal ring bent on both sides. The inner seal ring is clamped and fixed to the outer ring of the bearing. The elastic middle seal ring includes an integrally structured middle seal ring annular part and outer and inner sealing lips of the middle seal ring bent on both sides and an inner ring extension part of the middle seal ring. The middle seal ring is located between the outer seal ring and the inner seal ring and is fixedly connected to the inner seal ring. The outer sealing lip of the middle seal ring extends towards the inlet of the labyrinth seal structure to form the inlet reverse seal structure. The inner ring extension part of the middle seal ring extends towards the outlet of the labyrinth seal structure to form the outlet reverse seal structure. The V-shaped angle of the inlet reverse seal structure has an angle R of 45 - 60°. The angle S formed between one branch and the other branch of the outlet reverse seal structure and the radial two sides of the inner ring of the bearing is 55 - 60°, and the angle T is 55 - 60°. The bearing housing has an outwardly extended shoulder, and the seal cover is placed at the shoulder. The seal cover is fixed on the support shaft, and there is a gap between the seal cover and the shoulder. An annular rib of the inner ring of the seal cover bearing is integrally provided on the inner side of the central hole of the seal cover, corresponding to the position of the inner ring of the bearing. The shoulder has an outward extension angle P of 3 - 5°. Its advantages are as follows: The engineering plastic cage has very little noise and has a self-lubricating effect, making the operation smoother. The bearing is galvanized and blackened, making it not easy to rust. The seal lip structure is more perfect, will not be lifted, will not let water in, and will not leak oil. The bearing is equipped with a labyrinth seal structure sealant, with low manufacturing cost, simple assembly, labor saving, and external sealing of the idler is required. The first sealing space, the second sealing space, and the third sealing space are all provided with outward reverse barbs, which can prevent outside air, water, and impurities from entering the bearing, improving the lubrication performance and anti-pollution performance. Multiple external seals of the bearing are cancelled, the bearing housing is shallower and shorter, and the load-bearing capacity of the bearing idler is improved. The bearing housing and the bearing assembly are integrated and simplified, reducing the total weight of the idler, reducing inertia, and greatly reducing its energy consumption. The installation working hours are simple, reducing equipment and personnel, and reducing the enterprise operation cost. The bearing housing assembly does not need to add lubricating grease, reducing secondary pollution gaps, and operating at a wide temperature range from -45 °C to 150 °C, suitable for various conveying machinery working conditions.After inspection, it meets the requirements of MT821-2006 standard, GB / T10595-2009 "Belt Conveyor" standard, and MT821-2006 "Technical Conditions for Idlers of Belt Conveyors for Coal Mines". The total damping coefficient of the idler is reduced by about 40%, the running noise is reduced by 20-30%, and the lubrication performance is improved by 20%. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the original idler.

[0012] Figure 2 It is a schematic structural diagram of the original sealed bearing.

[0013] Figure 3 It is a schematic structural diagram of the idler of the present invention.

[0014] Figure 4 It is an enlarged schematic diagram of the idler, bearing and bearing housing of the present invention.

[0015] Figure 5 It is a schematic structural diagram of the bearing of the present invention.

[0016] Figure 6 It is Figure 5 A partial enlarged schematic diagram of the upper half.

[0017] Figure 7 It is a schematic structural diagram of the bearing housing of the present invention.

[0018] Figure 8 It is a schematic structural diagram of the cage of the bearing of the present invention.

[0019] Figure 9 It is Figure 8 The K-direction view in

[0020] Figure 10 It is a schematic diagram of half of the cage of the bearing of the present invention.

[0021] Figure 11 It is Figure 10 The A-A cross-sectional view in

[0022] Figure 12 It is Figure 10 The B-B cross-sectional view in

[0023] Figure 13 It is a partial enlarged view of the labyrinth seal.

[0024] Bearing housing 1, idler 2, fully effective sealed energy-saving silent bearing 3, labyrinth seal structure 4, contact seal lip 5, bearing inner ring 3-1, bearing outer ring 3-2, cage 3-3, ball 3-4, raceway 3-5, outer seal ring 4-1, elastic middle seal ring 4-2, inner seal ring 4-3, outer seal ring annular part 4-1-1, inner flange of outer seal ring 4-1-2, outer flange of outer seal ring 4-1-3, middle seal ring annular part 4-2-1, outer seal lip of middle seal ring 4-2-2, inner extension of middle seal ring 4-2-3, inner seal ring annular part 4-3-1, inner flange of inner seal ring 4-3-2, outer flange of inner seal ring 4-3-3, outlet reverse seal structure 6, galvanized layer 7, single-layer rubber contact seal structure 8, seal cover 9, first groove of bearing outer ring 10, skeleton 8-1, single-layer contact seal ring 8-2, wrapping seal lip 11, inlet reverse seal structure 12, first seal space 13, second seal space 14, third seal space 15, second groove of bearing outer ring 16, groove of bearing inner ring 17, seal cover stiffener 18, seal cover bearing inner ring annular rib 19, shoulder 20, clearance 21, spacer ring 22, original sealed bearing 23, retaining ring 24, outer seal ring 25, inner seal ring 26, original bearing housing 27, seal groove 28, support shaft 29. Detailed implementation mode

[0025] Embodiment 1 The technical solution will be described in detail below with reference to the accompanying drawings: a carrying roller 2 and two single-sided open bearing seats 1. The two bearing seats 1 are respectively arranged in the openings on both sides of the carrying roller 2, the openings of the bearing seats 1 face outwards, and the bearing seats 1 are fixedly welded to the carrying roller 2. Each bearing seat 1 is provided with a full-effect sealed energy-saving silent bearing 3. The full-effect sealed energy-saving silent bearing 3 includes a bearing inner ring 3-1, a bearing outer ring 3-2, a cage 3-3 and a plurality of balls 3-4. A cage 3-3 is arranged between the bearing inner ring 3-1 and the bearing outer ring 3-2, and a plurality of pockets of the cage 3-3 are respectively provided with balls 3-4. A raceway 3-5 corresponding to the balls 3-4 is arranged between the bearing outer ring 3-2 and the bearing inner ring 3-1. The cage 3-3 is made of engineering plastic (nylon), which can reduce friction and improve lubrication performance (self-lubrication). Nylon has good elasticity, low density and small damping coefficient. When running, it can better guide the rolling of the balls 3-4, and has low temperature rise, especially suitable for bearings that need to rotate at high speed. There are easy to appear sharp corners at the edges of metal cages, while this problem hardly exists in nylon cages. This is also beneficial to the reasonable distribution of lubricating grease in the bearing cavity, so it can significantly improve the bearing life. When the lubricating grease in the bearing is evenly distributed, the starting torque of the nylon cage is smaller than that of a metal cage such as an iron cage, and it has better corrosion resistance. At the same time, nylon has a self-lubricating effect and can run well even in an under-lubricated state. It can be formed in one piece, and the machining accuracy is easier to guarantee. The density of nylon is only one-seventh of that of iron, so it is lighter, has a smaller friction coefficient, can better resist the impact of the balls 3-4, and is more flexible and quieter than an iron cage when guiding the metal balls 3-4 to run.

[0026] The pocket holes of the cage 3-3 are arc-shaped with pocket hole openings, which can enclose the balls 3-4, and the pocket hole openings face the direction of the single-layer rubber contact seal structure 8. One end face of the full-effect sealed energy-saving silent bearing 3 is provided with a labyrinth seal structure 4. The labyrinth seal structure 4 includes an outer seal ring 4-1, an elastic middle seal ring 4-2, and an inner seal ring 4-3. The outer seal ring 4-1 includes an outer seal ring annular part 4-1-1 which is an integral structure, and outer seal ring inner ring flanges 4-1-2 and (circular) outer seal ring outer ring flanges 4-1-3 (circular) on both sides. The outer seal ring 4-1 is made of metal. The outer seal ring inner ring flanges 4-1-2 and the outer seal ring outer ring flanges 4-1-3 extend towards the cage 3-3 and are perpendicular to the outer seal ring annular part 4-1-1. The outer seal ring inner ring flanges 4-1-2 are longer than the outer seal ring outer ring flanges 4-1-3. The outer seal ring 4-1 (the outer seal ring inner ring flanges 4-1-2) is fixedly sleeved on the bearing inner ring 3-1 and rotates synchronously. The outer seal ring annular part 4-1-1 is flush with one end face of the bearing inner ring 3-1 and the bearing outer ring 3-2. The surface of the outer seal ring annular part 4-1-1 has a galvanized layer 7. The inner seal ring 4-3 includes an inner seal ring annular part 4-3-1 which is an integral structure, and inner seal ring inner ring flanges 4-3-2 (circular) and inner seal ring outer ring flanges 4-3-3 (circular) on both sides. The inner seal ring 4-3 is made of metal.

[0027] Both the inner seal ring inner ring flanges 4-3-2 and the inner seal ring outer ring flanges 4-3-3 extend in the opposite direction to the cage 3-3. The inner seal ring outer ring flanges 4-3-3 are perpendicular to the inner seal ring annular part 4-3-1, and the inner seal ring inner ring flanges 4-3-2 extend away from the inner seal ring annular part 4-3-1 to form an angle S. The inner seal ring annular part 4-3-1 is located inside the outer seal ring outer ring flanges 4-1-3. The outer seal ring outer ring flanges 4-1-3 are located between the inner seal ring inner ring flanges 4-3-2 and the inner seal ring outer ring flanges 4-3-3. The inner seal ring outer ring flanges 4-3-3 are located in the first groove 10 of the bearing outer ring and are clamped in contact and rotate synchronously. The inner seal ring inner ring flanges 4-3-2 are located inside the concave side of the outer seal ring 4-1 and extend towards the outer seal ring inner ring flanges 4-1-2.

[0028] The elastic middle seal ring 4-2 includes a middle seal ring annular part 4-2-1 which is an integral structure, and middle seal ring outer ring sealing lips 4-2-2 (circular) and middle seal ring inner ring extension parts 4-2-3 (circular) on both sides. The elastic middle seal ring 4-2 is made of an elastic material (such as nitrile rubber).

[0029] The elastic middle seal ring 4-2 is located on the side of the inner seal ring 4-3 opposite to the cage 3-3 and is fixedly connected.

[0030] One of the outer sealing lips 4-2-2 of the middle sealing ring extends along the flanging 4-3-3 of the outer ring of the inner sealing ring and wraps the flanging 4-3-3 of the outer ring of the inner sealing ring and forms a wrapping sealing lip 11 (ring-shaped) on the end face of the flanging 4-3-3 of the outer ring of the inner sealing ring. The other of the outer sealing lips 4-2-2 of the middle sealing ring extends outward to the flanging 4-1-3 of the outer ring of the outer sealing ring at the middle of the flanging 4-3-3 of the outer ring of the inner sealing ring, and is bent to form an axial contact sealing lip 5 (ring-shaped) that contacts the flanging 4-1-3 of the outer ring of the outer sealing ring. The two extensions form a V-shaped entrance reverse sealing structure 12, which is the first sealing space 13. And an angle R is formed.

[0031] The opening of the entrance reverse sealing structure 12 faces the entrance of the labyrinth sealing structure 4, and reversely blocks the entrance of the labyrinth seal 4 to prevent air, water and impurities from entering the bearing.

[0032] The inner ring extension 4-2-3 of the middle sealing ring extends along the flanging 4-3-2 of the inner ring of the inner sealing ring and wraps both sides of the flanging 4-3-2 of the inner ring of the inner sealing ring.

[0033] The inner ring extension 4-2-3 of the middle sealing ring forms an exit reverse sealing structure 6 of the labyrinth sealing structure 4 similar to a V shape at the edge of the flanging 4-3-2 of the inner ring of the inner sealing ring.

[0034] One of the exit reverse sealing structures 6 extends to the outer ring annular part 4-1-1 and the inner ring flanging 4-1-2 of the outer sealing ring, and a second sealing space 14 is formed between the outer ring annular part 4-1-1 and the inner ring flanging 4-1-2 of the outer sealing ring. An angle S is formed.

[0035] The other of the exit reverse sealing structures 6 extends to the inner ring flanging 4-1-2 of the outer sealing ring and the cage 3-3. There is also a sealing groove 28 (ring-shaped) on the side facing the cage 3-3, and a third sealing space 15 is formed between the inner ring flanging 4-1-2 of the outer sealing ring and the cage 3-3. An angle T is formed.

[0036] One of the exit reverse sealing structures 6 reversely blocks the entrance of the labyrinth seal 4, and the other of the exit reverse sealing structures 6 reversely blocks the connection port between the labyrinth sealing structure 4 and the cage 3-3.

[0037] That is, the outer sealing ring 4-1 and the inner sealing ring 4-3 that are misaligned and buckled form a labyrinth sealing channel similar to a Z shape. The entrance is reversely blocked by the entrance reverse sealing structure 12, and the exit is reversely blocked by the exit reverse sealing structure 6 on both sides at the same time, so as to prevent air, water and impurities from entering from the outside and prevent oil leakage from the inside.

[0038] On the other end face of the full-effect sealing energy-saving silent bearing 3, there is a single-layer rubber contact sealing structure 8 (conventional rubber and SPCC skeleton sealing structure, which is a known technology).

[0039] The single-layer rubber contact seal structure 8 includes a skeleton 8-1 and a single-layer contact seal ring 8-2.

[0040] The single-layer contact seal ring 8-2 wraps the skeleton 8-1 from the outside.

[0041] The outer ring of the single-layer contact seal ring 8-2 is arranged in the second groove 16 of the outer ring of the bearing.

[0042] The inner sealing lip of the single-layer contact seal ring 8-2 is arranged in the groove 17 of the inner ring of the bearing.

[0043] The existing inner sealing lip of the single-layer contact seal ring 8-2 directly contacts the surface of the inner ring 3-1 of the bearing. Although sealing can be achieved and the single-layer rubber contact seal structure 8 and the inner ring 3-1 of the bearing rotate separately, there will still be a certain amount of friction after all. In this structure, a groove 17 of the inner ring of the bearing is arranged on the outer surface of the inner ring 3-1 of the bearing, making the relative rotation of the single-layer rubber contact seal structure 8 and the inner ring 3-1 of the bearing smoother.

[0044] The full-effect sealed energy-saving and silent bearing 3 is arranged in the bearing housing 1. The labyrinth seal structure 4 faces the opening of the bearing housing 1, and a seal cover 9 is buckled on the outside. The inner ring 3-1 of the bearing and the middle hole of the seal cover 9 are in interference fit with the support shaft 29 that supports the inner ring 3-1 of the bearing.

[0045] A seal cover reinforcing rib 18 (ring-shaped) is arranged on the inner side of the seal cover 9.

[0046] An annular rib 19 of the inner ring of the seal cover is integrally arranged on the inner side of the middle hole of the seal cover 9. The annular rib 19 of the inner ring of the seal cover has the same annular width as the inner ring 3-1 of the bearing, playing a role in supporting the inner ring 3-1 of the bearing.

[0047] The bearing housing 1 is provided with a shoulder 20 with an outward-expanded variable diameter. The full-effect sealed energy-saving and silent bearing 3 is arranged inside the bearing housing 1. The seal cover 9 is arranged at the shoulder 20 and has a gap 21 (ring-shaped) with the shoulder 20.

[0048] The shoulder 20 has an angle P. During operation, water will enter. Also, due to the existence of the angle P, the water will be thrown out of the gap 21.

[0049] Lubricating grease is injected between the cage 3-3 and the balls 3-4 of this bearing. There is lubricating grease inside the labyrinth seal structure 4 and inside the single-layer rubber contact seal structure 8.

[0050] When the bearing rotates, due to the friction between the balls 3-4 and the raceway 3-5, and the stirring effect of the balls 3-4 and the cage 3-3 on the lubricating grease, the temperature of the bearing rises, softening the lubricating grease and generating a pressure difference.

[0051] The two contact surfaces between the outer bearing ring 3-2 and the bearing housing 1 are precision machined, and the contact surface between the outer bearing ring 3-2 and the bearing housing 1 (the sealing surface on the outer bearing ring 3-2) is carbonized (carbonizing and blackening is a known technique).

[0052] After testing, the lifespan of this bearing is increased and its sealing performance is better than that of bearings sealed by single-layer rubber contact sealing structures 8 on both sides.

[0053] Due to the need to place the labyrinth sealing structure 4, this full-effect sealed energy-saving silent bearing 3 needs to have a wider space on one side. This bearing is of an asymmetric form, with the inner bearing ring 3-1 and the outer bearing ring 3-2 being axially wider and having a stronger load-bearing capacity.

[0054] When the idler 2 is running, the outer bearing ring 3-2, the elastic middle sealing ring 4-2, the inner sealing ring 4-3, the single-layer rubber contact sealing structure 8, the cage 3-3 and the balls 3-4 rotate synchronously with the idler 2, while the outer sealing ring 4-1, the inner bearing ring 3-1, the protective cover 9 and the support shaft 29 are relatively stationary.

[0055] The angle R is 45°, S is 55°, T is 55°, and the angle P is 3°.

[0056] Example 2 Example 2 is basically the same as Example 1, except that: the angle R is 60°, S is 60°, T is 60°, and the angle P is 5°.

[0057] Example 3 Example 3 is basically the same as Example 1, except that: the angle R is 50°, S is 57°, T is 57°, and the angle P is 4°.

Claims

1. The full-effect sealed energy-saving silent idler has an idler (2) and bearing seats (1) fixed on both sides of the idler (2); a full-effect sealed energy-saving silent bearing (3) is arranged in each bearing seat (1); The full-effect sealed energy-saving silent bearing (3) includes an inner bearing ring (3-1), an outer bearing ring (3-2), a cage (3-3) and a plurality of balls (3-4); a cage (3-3) is arranged between the inner bearing ring (3-1) and the outer bearing ring (3-2), and balls (3-4) are in the pockets of the cage (3-3); a single-layer rubber contact sealing structure (8) is arranged on one end face of the full-effect sealed energy-saving silent bearing (3); It is characterized in that: A labyrinth sealing structure (4) is arranged on the other end face of the full-effect sealed energy-saving silent bearing (3); An inlet reverse sealing structure (12) is arranged at the inlet of the labyrinth sealing structure (4); An outlet reverse sealing structure (6) is arranged at the outlet of the labyrinth sealing structure (4); The inner bearing ring (3-1) is fixed on a support shaft (29); The elastic middle sealing ring (4-2) includes a middle sealing ring annular part (4-2-1) which is an integral structure, and middle sealing ring outer ring sealing lips (4-2-2) and middle sealing ring inner ring extension parts (4-2-3) bent on both sides; The elastic middle sealing ring (4-2) is located between the outer sealing ring (4-1) and the inner sealing ring (4-3), and is fixedly connected with the inner sealing ring (4-3); The middle sealing ring outer ring sealing lip (4-2-2) extends towards the inlet of the labyrinth sealing structure (4) to form an inlet reverse sealing structure (12); The middle sealing ring inner ring extension part (4-2-3) extends towards the outlet of the labyrinth sealing structure (4) to form an outlet reverse sealing structure (6); One branch of the middle sealing ring outer ring sealing lip (4-2-2) extends along the outer ring flange (4-3-3) of the inner sealing ring and wraps the outer ring flange (4-3-3) of the inner sealing ring and forms a wrapping sealing lip (11) on the end face of the outer ring flange (4-3-3) of the inner sealing ring. Another branch of the middle sealing ring outer ring sealing lip (4-2-2) extends towards the outer ring flange (4-1-3) of the outer sealing ring in the middle of the outer ring flange (4-3-3) of the inner sealing ring and bends to form an axial contact sealing lip (5) in contact with the outer ring flange (4-1-3) of the outer sealing ring. The two branches extend to form a V-shaped inlet reverse sealing structure (12), which is a first sealing space (13), and forms an angle R. The bearing seat (1) has an outward-expanded shoulder (20), a sealing cover (9) is placed at the shoulder (20), the sealing cover (9) is fixed on the support shaft (29), and there is a gap (21) between the sealing cover (9) and the shoulder (20). The shoulder (20) has an outward expansion angle P of 3-5°.

2. The full-effect sealed energy-saving silent idler according to claim 1, characterized in that: The inner ring sealing lip of the single-layer contact sealing ring (8-2) is arranged in the inner bearing ring groove (17).

3. The full-effect sealed energy-saving silent idler according to claim 1, characterized in that: The cage (3-3) is made of engineering plastic.

4. The full-effect sealed energy-saving silent idler according to claim 1, characterized in that: The labyrinth seal structure (4) includes a labyrinth seal passage formed by a mating outer seal ring (4-1) and inner seal ring (4-3); The inlet reverse seal structure (12) is V-shaped with the opening facing the inlet of the labyrinth seal structure (4); The outlet reverse seal structure (6) is V-shaped, with one branch extending reversely to block the inlet of the labyrinth seal structure (4), and the other branch reversely blocking the connection port between the labyrinth seal structure (4) and the cage (3-3).

5. The all-effect sealed energy-saving and silent idler according to claim 4, characterized in that: The outer seal ring (4-1) includes an integrally structured outer seal ring annular part (4-1-1), and inner flanges (4-1-2) and outer flanges (4-1-3) bent on both sides; The outer seal ring (4-1) is fixedly connected to the inner ring of the bearing (3-1); The inner seal ring (4-3) includes an integrally structured inner seal ring annular part (4-3-1), and inner flanges (4-3-2) and outer flanges (4-3-3) bent on both sides; The inner seal ring (4-3) is clamped and fixed to the outer ring of the bearing (3-2).

6. The all-effect sealed energy-saving and silent idler according to claim 5, characterized in that: The V-shaped angle of the inlet reverse seal structure (12) has an angle R of 45-60°; The angle S formed between one branch and the other branch of the outlet reverse seal structure (6) with respect to the two radial sides of the inner ring of the bearing (3-1) is 55-60°, and the angle T is 55-60°.

7. The all-effect sealed energy-saving and silent idler according to claim 6, characterized in that: The angle R is 45°, S is 55°, T is 55°; or the angle R is 60°, S is 60°, T is 60°; or the angle R is 50°, S is 57°, T is 57°.

8. The all-effect sealed energy-saving and silent idler according to claim 5, characterized in that: The end face of the outer seal ring annular part (4-1-1) has a galvanized layer (7).

9. The all - effect sealed energy - saving and silent idler according to claim 1, wherein: An inner annular rib (19) of the seal cover bearing is integrally provided on the inner side of the middle hole of the seal cover (9), corresponding to the position of the inner ring of the bearing (3-1).

10. The all-effect sealed energy-saving and silent idler according to claim 1, characterized in that: The angle P is 3°, or the angle P is 5°, or the angle P is 4°.

11. The all - effect sealed energy - saving and silent idler according to claim 1, wherein: The sealing surface of the outer ring of the bearing (3-2) is carbonized.

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