An ultra-high molecular weight polyethylene top roller

Abstract

This utility model relates to the field of industrial idler roller technology, specifically an ultra-high molecular weight polyethylene idler roller, comprising a roller and a roller shaft coaxially penetrating the roller. Bearings are provided at the ends of the roller and the corresponding ends of the roller shaft. A sealing assembly is provided between the roller and the roller shaft on the axially outer side of the corresponding bearing. The sealing assembly comprises: a first sealing element, which is sealed and sleeved on the roller shaft body; the first sealing element has a radially extending portion at its axial center; and a first labyrinth mating portion on the axially inner end face of the radially extending portion; and a second sealing element, which is spaced apart and sleeved at the axially inner end of the radially extending portion, sealingly fitting against the inner wall of the roller. The sealing assembly of this utility model can form a labyrinth structure through the first and second labyrinth mating portions, and effectively seal the mating gap between the first and second sealing elements through the third sealing element, thereby enhancing the sealing effect of the idler roller.

Description

Technical Field

[0001] This utility model relates to the field of industrial idler roller technology, and in particular to an ultra-high molecular weight polyethylene idler roller. Background Technology

[0002] Belt conveyors are common equipment in the lifting and transportation industry, and idlers are an important component of belt conveyors, especially in the harsh environment of coal mines where idlers are exposed to high dust and corrosion.

[0003] Currently, the vast majority of idlers in China are still made of steel. Their main drawbacks are: they are heavy, have high energy consumption, high starting resistance, and are not corrosion resistant. In particular, under the combined effects of corrosion and wear, their service life becomes even shorter. These adverse factors seriously affect the normal operation and conveying efficiency of the conveyor.

[0004] Ultra-high molecular weight polyethylene (UHMWPE) is a linear thermoplastic engineering plastic with excellent comprehensive properties. It possesses superior wear resistance, self-lubricating properties, high strength, chemical stability, and strong anti-aging performance. Currently, due to its excellent properties, UHMWPE is beginning to be used in the field of idler rollers. Existing UHMWPE idler rollers have a relatively simple structure, utilizing only the physical properties of modified UHMWPE. However, their sealing performance is relatively poor; bearings are prone to displacement during use, leading to reduced roller lifespan, increased noise, and poor transmission efficiency.

[0005] To address this, we designed an ultra-high molecular weight polyethylene idler roller. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, this utility model discloses an ultra-high molecular weight polyethylene idler roller.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] A high-molecular-weight polyethylene idler roller includes a roller and a roller shaft coaxially extending through the roller. Bearings are provided at the ends of the roller and the corresponding ends of the roller shaft. A sealing assembly is provided between the roller and the roller shaft on the axially outer side of the corresponding bearing. The sealing assembly includes:

[0009] A first sealing element is fitted onto the roller shaft body. The first sealing element has a radial extension portion in the axial middle part, and the radial extension portion has a first labyrinth mating portion on its axial inner end face.

[0010] The second sealing element is spaced out and sleeved on the axial inner end of the radial extension and sealed against the inner wall of the roller. The axial outer end face of the second sealing element is provided with a second labyrinth mating part, and the second labyrinth mating part and the first labyrinth mating part form a labyrinth mating structure.

[0011] The third sealing element is spaced out and sleeved at the axial outer end of the radial extension, sealingly fitting against the inner wall of the roller.

[0012] The fourth seal is located between the radial extension and the third seal. The fourth seal has a tapered lip that extends outward along the axial direction on its radially inner side, and the radially outer side of the tapered lip abuts against the third seal and the axially outer end abuts against the first seal.

[0013] Preferably, a retaining ring is provided on the roller shaft at the position between the bearing and the first seal.

[0014] Preferably, the inner wall of the roller is provided with a bearing seat for mounting the bearing.

[0015] Preferably, the sealing assembly is located between the roller and the bearing housing.

[0016] Preferably, an annular fitting structure is provided between the outer ring surface of the third seal and the inner ring surface of the bearing housing.

[0017] Preferably, the bearing housing has two rings of first process holes arranged axially along its circumference on its inner end face.

[0018] Preferably, the bearing housing is provided with a bottom sealing ring at a position corresponding to the inner end face of the bearing axially.

[0019] Preferably, a reinforcing sleeve is provided between the bearing housing and the outer ring surface of the bearing, and the inner axial end of the reinforcing sleeve is provided with a retaining edge located between the bottom sealing ring and the outer ring of the bearing.

[0020] Preferably, the outer end face of the reinforcing sleeve is provided with a plurality of second process holes and / or outer edge annular grooves along its circumference.

[0021] Preferably, the inner annular surface of the third seal matches the tapered shape of the tapered lip.

[0022] By adopting the technical solution described above, this utility model has the following beneficial effects:

[0023] 1. The sealing component is designed to form a labyrinth structure through the first labyrinth mating part and the second labyrinth mating part, and effectively seals the mating gap between the first seal and the second seal through the third seal, thereby enhancing the sealing effect of the idler roller;

[0024] 2. The outer ring groove can save raw materials, improve the shrinkage defects of the reinforcing sleeve, and enhance the load-bearing capacity. Compared with setting process holes, it can better protect the bearing and also avoid waste caused by entering the process holes.

[0025] 3. The setting of two rings of first process holes in the bearing housing, compared with one ring of process holes, can save raw materials, improve the shrinkage defects of the bearing housing, and enhance the load-bearing capacity. Attached Figure Description

[0026] Figure 1 This is a partial schematic diagram of the first structure of this utility model;

[0027] Figure 2 This is a partial explosion diagram of the first structure of this utility model;

[0028] Figure 3 This is a partial explosion diagram of the second structure of this utility model;

[0029] Figure 4 This is a schematic diagram of the axial inner end face of the bearing housing in this utility model.

[0030] In the figure: 1. Roller (1); 2. Roller shaft (2); 3. Bearing (3); 4. Sealing assembly (4); 41. First seal (41); 411. Radial extension (411); 412. First labyrinth mating part (412); 42. Second seal (42); 421. Second labyrinth mating part (421); 43. Third seal (43); 44. Fourth seal (44); 441. Conical lip (441); 5. Retaining ring (5); 6. Bearing seat (6); 61. First process hole (61); 7. Bottom sealing ring (7); 8. Reinforcing sleeve (8); 81. Side flange (81); 82. Second process hole (82); 83. Outer annular groove (83). Detailed Implementation

[0031] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. They are used for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation.

[0032] Example 1, in conjunction with Appendix Figure 1-4A type of ultra-high molecular weight polyethylene (UHMWPE) idler roller includes a roller 1 and a roller shaft 2 coaxially passing through the roller 1. The outer surface of the roller 1 is made of UHMWPE material, as needed. Bearings 3 are provided at the ends of the roller 1 and the corresponding ends of the roller shaft 2. A sealing assembly 4 is provided between the roller 1 and the roller shaft 2, located axially outside the corresponding bearing 3. As needed, a bearing seat 6 for mounting the bearing 3 is provided on the inner wall of the roller 1. Furthermore, the inner wall of the roller 1 and the outer circumferential surface of the bearing seat 6 are provided with mutually mating stepped surfaces.

[0033] Furthermore, to prevent the bearing 3 from moving axially, the inner ring surface of the bearing housing 6 has a positioning step surface for positioning the inner end face of the bearing 3 axially; a retaining ring 5 is provided on the shaft body of the roller 2 at the position between the bearing 3 and the first seal 41.

[0034] Depending on the requirements, the bearing housing 6 is injection molded from polypropylene, ABS, or nylon. Furthermore, in conjunction with the attached... Figure 4 The bearing housing 6 has two rings of first process holes 61 arranged axially along its inner end face along its circumference; this can save raw materials while improving the shrinkage defects of the bearing housing 6 and enhancing its load-bearing capacity.

[0035] Sealing assembly 4 includes:

[0036] The first sealing element 41 is sealed and sleeved on the shaft of the roller 2. The first sealing element 41 has a radial extension 411 in the axial middle part, and the radial extension 411 has a first labyrinth mating part 412 on the axial inner end face.

[0037] The second sealing element 42 is spaced and sleeved on the inner end of the radial extension 411 and sealed against the inner wall of the roller 1. The outer end face of the second sealing element 42 is provided with a second labyrinth mating part 421, and the second labyrinth mating part 421 and the first labyrinth mating part 412 form a labyrinth mating structure.

[0038] As needed, the first labyrinth mating part 412 has one annular part or two or more coaxial annular parts; the second labyrinth mating part 421 has one annular part or two or more coaxial annular parts; the annular parts in the second labyrinth mating part 421 and the annular parts in the first labyrinth mating part 412 are interlocked to form a labyrinth mating structure.

[0039] The third sealing element 43 is spaced out and sleeved at the axial outer end of the radial extension 411 and sealed against the inner wall of the roller 1.

[0040] The fourth seal 44 is disposed between the radial extension 411 and the third seal 43. The fourth seal 44 has a tapered lip 441 that extends outward along the axial direction on its radial inner side, and the radial outer side of the tapered lip 441 abuts against the third seal 43 and the axial outer end abuts against the first seal 41.

[0041] As required, the inner annular surface of the third seal 43 is matched with the tapered shape of the tapered lip 441.

[0042] As required, the axial inner end of the third seal 43 has an abutting portion that abuts against the radial outer annular surface of the fourth seal 44.

[0043] Specifically, the inner cavity of sealing component 4 is filled with grease.

[0044] The fourth seal 44 can effectively seal the gap between the first seal 41 and the second seal 42, thereby enhancing the sealing effect of the idler roller.

[0045] Depending on the requirements, the sealing component 4 may be injection molded from polypropylene, ABS or nylon.

[0046] It should be noted that the third seal 43 can be understood as a sealing outer cover.

[0047] When the inner wall of the roller 1 has a bearing seat 6 for mounting the bearing 3; the sealing assembly 4 is located between the roller 2 and the bearing seat 6, and the second seal 42 and the third seal 43 are both sealed and fitted to the inner wall of the bearing seat 6.

[0048] To prevent the third seal 43 from falling off, an annular fitting structure is provided between the outer ring surface of the third seal 43 and the inner ring surface of the bearing housing 6; specifically, the inner ring surface of the bearing housing 6 is provided with an annular groove, and the outer ring surface of the third seal 43 is provided with an annular protrusion that is embedded into the annular groove.

[0049] Example 2, in conjunction with Appendix Figure 1-3 A type of ultra-high molecular weight polyethylene idler roller, based on embodiment one, has a bottom sealing ring 7 provided on the bearing housing 6 at the position corresponding to the axial inner end face of the bearing 3; this can increase the sealing performance of the bearing relative to the inner side of the roller.

[0050] Depending on the requirements, the bottom sealing ring 7 may be injection molded from an elastomer, PVC, or rubber.

[0051] Example 3, in conjunction with Appendix Figure 1-3 A type of ultra-high molecular weight polyethylene idler roller, based on embodiment two, has a reinforcing sleeve 8 provided between the bearing housing 6 and the outer ring surface of the bearing 3, and the inner end of the reinforcing sleeve 8 is provided with a retaining edge 81 located between the bottom sealing ring 7 and the outer ring of the bearing 3.

[0052] As required, the reinforcing sleeve 8 is injection molded from nylon resin or polytetrafluoroethylene.

[0053] Furthermore, in conjunction with the appendix Figure 2 The reinforcing sleeve 8 has several second process holes 82 along its circumference on its outer axial end face, and / or combined with attachments. Figure 3The reinforcing sleeve 8 has an outer annular groove 83 along its circumference on its axial outer end face. This saves raw materials while improving the shrinkage defects of the reinforcing sleeve 8 and enhancing its load-bearing capacity. The outer annular groove 83 can be understood as the reinforcing sleeve 8 having a reduced diameter section at the position corresponding to the axial outer end, making the outer annular surface of the reinforcing sleeve 8 a circumferential stepped surface. Compared with the second process hole 82, this provides better protection for the bearing 3 and also avoids waste caused by entering the process hole.

[0054] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents within this utility model.

Claims

1. A high molecular weight polyethylene idler roller, comprising a roller (1) and a roller shaft (2) coaxially penetrating the roller (1), wherein bearings (3) are provided at the ends of the roller (1) and the corresponding ends of the roller shaft (2), and a sealing assembly (4) is provided between the roller (1) and the roller shaft (2) on the axially outer side of the corresponding bearings (3), characterized in that: The sealing assembly (4) includes: The first sealing element (41) is sealed and sleeved on the shaft of the roller (2). The first sealing element (41) has a radial extension (411) in the axial middle part, and the radial extension (411) has a first labyrinth mating part (412) on the axial inner end face. The second sealing element (42) is spaced and sleeved on the inner end of the radial extension (411) and sealed against the inner wall of the roller (1). The outer end face of the second sealing element (42) is provided with a second labyrinth mating part (421), and the second labyrinth mating part (421) and the first labyrinth mating part (412) form a labyrinth mating structure. The third sealing element (43) is spaced out and sleeved at the outer end of the radial extension (411) and sealed against the inner wall of the roller (1); The fourth seal (44) is located between the radial extension (411) and the third seal (43). The fourth seal (44) has a conical lip (441) that extends outward along the axial direction on its radial inner side. The radial outer side of the conical lip (441) abuts against the third seal (43), and the axial outer end abuts against the first seal (41). The roller (2) has a retaining ring (5) located between the bearing (3) and the first seal (41).

2. The ultra-high molecular weight polyethylene tractor roller according to claim 1, characterized in that: The inner wall of the roller (1) is provided with a bearing seat (6) for mounting the bearing (3).

3. The ultra-high molecular weight polyethylene tractor roller according to claim 2, characterized in that: The sealing assembly (4) is located between the roller (2) and the bearing housing (6).

4. The ultra-high molecular weight polyethylene tractor roller as claimed in claim 3, wherein: The outer ring surface of the third seal (43) and the inner ring surface of the bearing seat (6) are provided with an annular fitting structure.

5. The ultra-high molecular weight polyethylene tractor roller as claimed in claim 2, wherein: The bearing housing (6) has two rings of first process holes (61) arranged axially along its inner end face.

6. The ultra-high molecular weight polyethylene tractor roller as claimed in claim 2, wherein: The bearing housing (6) is provided with a bottom sealing ring (7) at the position corresponding to the axial inner end face of the bearing (3).

7. The ultra-high molecular weight polyethylene tractor roller as claimed in claim 6, wherein: A reinforcing sleeve (8) is provided between the bearing housing (6) and the outer ring of the bearing (3), and the inner end of the reinforcing sleeve (8) is provided with a retaining edge (81) located between the bottom sealing ring (7) and the outer ring of the bearing (3).

8. The ultra-high molecular weight polyethylene tractor roller as claimed in claim 7, wherein: The reinforcing sleeve (8) has a plurality of second process holes (82) and / or outer edge annular grooves (83) along its circumference on its axial outer end face.

9. The ultra-high molecular weight polyethylene tractor roller as claimed in claim 1, wherein: The inner annular surface of the third seal (43) matches the conical shape of the conical lip (441).

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