Waterproof idler structure and its belt conveyor

Abstract

This invention relates to the field of conveyor belt idler technology, particularly to a waterproof idler structure and its belt conveyor. The structure includes an idler cylinder and an idler shaft. Both ends of the idler cylinder are sealed and fixed with mounting seats. The idler shaft coaxially passes through the idler cylinder and the mounting seats, and is rotatably connected to the mounting seats via bearings. A sealing seat is sealed inside the mounting seat. Inside the sealing seat, along the axial direction of the idler shaft, a first sealing element and a second sealing element are sequentially arranged. A pressure cap is provided on one end face of the mounting seat. The pressure cap includes a connecting edge, an annular cover, and two sealing lips. The connecting edge is fixedly connected to one end face of the mounting seat and integrally formed on the outer circumference of the annular cover. The sealing lips are fixedly arranged on the end face of the annular cover near the first sealing element. The first sealing element includes an inner cover, an outer cover, a first spiral element, and a second spiral element. This invention utilizes the first and second spiral elements to significantly reduce the penetration rate of water and dust impurities.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of conveyor belt idler, in particular to a waterproof idler structure and a belt conveyor. BACKGROUND

[0002] As an indispensable supporting component in the conveyor belt system, the sealing structure of the idler is directly related to the operation efficiency, maintenance cost and service life of the equipment. At present, the idler sealing technology shows diversified development trend in different industrial scenes, both continuous optimization of traditional structure and integration innovation of new materials and new ideas.

[0003] From the structure type, the labyrinth seal is still the first choice in many conventional working conditions due to its low cost and low friction, but its dustproof effect is easily affected by the equipment speed and environmental dust concentration, especially in high-speed or high-pollution scenes, the problems of lubricating grease loss and sealing decay are more prominent. The contact seal forms a barrier through the physical contact of the rubber or polyurethane lip seal ring with the shaft, which performs excellently in dustproof and waterproof performance, especially suitable for harsh environments such as metallurgy and chemical industry, however, the wear caused by long-term friction and the shortened life under high temperature are still its inherent shortcomings.

[0004] In order to consider the performance requirements of dustproof, waterproof, low friction and long life, the combined seal which can integrate the advantages of different sealing structures has gradually become the mainstream choice, among which the combination of labyrinth structure and contact lip seal is a typical application. This combination should further improve the sealing reliability through the synergistic effect of the two, but from the current actual use, there are still obvious design shortcomings: since there is no transitional dustproof and waterproof buffer structure between the labyrinth structure and the lip seal, once the lip seal leaks due to wear, aging and other problems, water, dust and other impurities in the external environment will directly penetrate the lip seal barrier and enter the interior of the labyrinth structure. Without the pre-protection of the labyrinth structure, its own dustproof ability is difficult to resist the invasion of impurities alone, which eventually leads to a significant decline in the protection efficiency of the entire sealing system, which cannot effectively protect the lubricating environment inside the idler, and further affects the operation stability and service life of the idler. SUMMARY

[0005] The purpose of the present application is to provide a waterproof idler structure and a belt conveyor to solve the problems raised in the background.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] The waterproof idler structure comprises an idler cylinder and an idler shaft, both ends of the idler cylinder are sealingly fixed with mounting seats, the idler shaft penetrates the idler cylinder and the mounting seat coaxially and is rotationally connected with the mounting seat through a bearing, and the inside of the mounting seat is sealingly fixed with a sealing seat.

[0008] The interior of the sealing seat is sequentially provided with a first sealing member and a second sealing member along the axial direction of the supporting roller shaft, and one end surface of the mounting seat is provided with a gland;

[0009] The gland comprises a connecting rim, an annular cover and two sealing pressure lips, wherein the connecting rim is fixedly connected to one end surface of the mounting seat, the connecting rim is integrally arranged on the outer periphery of the annular cover, and the sealing pressure lips are fixedly arranged on the end surface of the annular cover close to the first sealing member;

[0010] The first sealing member comprises an inner cover, an outer cover, a first spiral member and a second spiral member, the outer periphery of the inner cover is sealingly fixed on the inner peripheral wall of the sealing seat, and the inner periphery of the inner cover is not in contact with the supporting roller shaft, the inner periphery of the outer cover is sealingly fixed on the supporting roller shaft, and the spacing between the outer periphery of the outer cover and the inner peripheral wall of the sealing seat is 0.8-1.5mm;

[0011] The outer cover comprises an integrally formed cover body and a protruding portion, and a first annular groove is formed between the cover body and the protruding portion;

[0012] The first spiral member and the second spiral member are both fixed on one side of the inner cover close to the outer cover, at least one first spiral member is arranged on the outer side of the second spiral member, the spacing between the first spiral member and the cover body is 0.8-1.2mm, and the spacing between the second spiral member and the protruding portion is 0.8-1.2mm;

[0013] The two sealing pressure lips are respectively arranged on the inner and outer sides of the protruding portion, and are pressed against the cover body, and the protruding portion is not in contact with the annular cover.

[0014] Preferably, the first spiral member and the second spiral member each comprise an integrally arranged head portion, a gradual change portion, a connecting portion and a fixed portion, and the head portion, the gradual change portion, the connecting portion and the fixed portion cooperatively form a spiral-shaped groove; the head portion is close to the outer cover, and the fixed portion is fixed on the inner cover.

[0015] Preferably, the second sealing member comprises an intermediate plate and two clamping plates clamped on both sides of the intermediate plate, the outer periphery of the clamping plate is sealingly connected to the inner surface of the sealing seat, and the inner periphery of the clamping plate is not in contact with the supporting roller shaft, and the inner periphery of the intermediate plate is sealingly and fixedly connected to the supporting roller shaft;

[0016] An intermediate cavity is formed between the two clamping plates, the intermediate plate is located inside the intermediate cavity, and a first flow-through gap is formed between the inner surface of the intermediate cavity and the intermediate plate;

[0017] A buffer ring is fixedly arranged on both sides of the intermediate plate, a third annular groove is formed in the clamping plate corresponding to the position of the buffer ring, the buffer ring is arranged inside the third annular groove and forms a second flow-through gap between the inner surface of the third annular groove and the buffer ring.

[0018] Preferably, the outer surface of the buffer ring is provided with a plurality of second annular grooves for buffering foreign matters flowing between the buffer ring and the third annular groove.

[0019] Preferably, the buffer ring is fixedly connected with the intermediate plate through an annular connecting piece.

[0020] The notch position of the third annular groove is fixedly provided with two arc-shaped rubber pieces, the two arc-shaped rubber pieces and the buffer ring form a third flow-through gap, the second flow-through gap cooperates with the third flow-through gap to form a fourth flow-through gap in the shape of an unsealed circular ring, and the two ends of the fourth flow-through gap are communicated with the first flow-through gap.

[0021] Preferably, the arc-shaped rubber piece is integrally provided with an embedded head, and the embedded head is embedded in an embedded groove formed in the inner surface of the third annular groove.

[0022] Preferably, the mounting seat and the carrier roller cylinder and the sealing seat and the mounting seat are connected through threads, respectively.

[0023] Preferably, the gland is accommodated in the inside of the carrier roller cylinder, and the connecting rim, the annular cover and the outer cover are made of stainless steel.

[0024] The belt conveyor comprises the waterproof carrier roller structure.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] In the present application, two sealing lips are arranged on the gland, so that double dustproof and waterproof insurance is provided, and when one of the sealing lips loses the sealing effect due to wear and other factors, the other sealing lip can still play a sealing role. In addition, the two sealing lips in the technical solution are arranged on the inner and outer sides of the protruding part, so that a bending type channel can be formed between the outer cover and the annular cover in cooperation with the protruding part, and the dustproof and waterproof effect is better. For example, water and dust in the external environment can enter between the annular cover and the carrier roller shaft, so the small-diameter sealing lip will be worn by dust and other particulate matters first. Once the small-diameter sealing lip loses the sealing ability due to wear, the water and dust in the external environment will first impact on the peripheral surface of the protruding part after breaking through the sealing of the small-diameter sealing lip, so as to realize the primary buffering of the water and dust, prevent the water and dust from entering between the large-diameter sealing lip and the outer cover, and prolong the service life of the large-diameter sealing lip.

[0027] When the water and dust in the external environment break through the seal of the pressure cover and enter between the inner cover and the outer cover, the water and dust are first contacted with the first spiral part, and a part of the water and dust is intercepted after the buffering of the first spiral part. The remaining water and dust are contacted with the second spiral part, and a part of the water and dust is again intercepted after the buffering of the second spiral part. In this way, the water and dust and other impurities are efficiently intercepted, and the penetration probability of the water and dust and other impurities is greatly reduced through multiple direction mutations and pressure attenuation. On the other hand, since the thickness of the second spiral part is greater than the thickness of the first annular groove, the penetration path of the water and dust and other impurities can be changed again by the second spiral part cooperating with the protruding part, and the protection effect is good. In addition, since the inner cover, the first spiral part and the second spiral part are fixedly connected with the carrier roller cylinder, the first spiral part and the second spiral part rotate together with the carrier roller cylinder. During the rotation, since the first spiral part and the second spiral part are spiral, the centrifugal force generated during the rotation moves the water and dust and other impurities outward along the spiral direction of the first spiral part or the second spiral part, that is, the water and dust and other impurities are thrown out of the inner cover and the outer cover, and the protection effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the application;

[0029] Figure 2 It is a schematic diagram of the structure of the carrier roller shaft, the pressure cover, the mounting seat, the bearing and the sealing seat of the application;

[0030] Figure 3 It is a schematic diagram of the structure of the carrier roller shaft, the pressure cover, the mounting seat, the bearing and the sealing seat of the application from another perspective;

[0031] Figure 4 It is a schematic diagram of the sectional structure of the pressure cover of the application;

[0032] Figure 5 It is a schematic diagram of the sectional structure of the pressure cover of the application;

[0033] Figure 6 It is a schematic diagram of the sectional structure of the pressure cover of the application;

[0034] Figure 7 It is a schematic diagram of the structure of the sealing seat, the first sealing part and the second sealing part of the application;

[0035] Figure 8 It is a schematic diagram of the structure of the first sealing part of the application;

[0036] Figure 9 It is a schematic diagram of the sectional structure of the first sealing part of the application;

[0037] Figure 10It is a sectional view of the first sealing element of the present application;

[0038] Figure 11 It is a sectional view of the second spiral element of the present application;

[0039] Figure 12 It is a structural view of the sealing seat and the second sealing element of the present application;

[0040] Figure 13 It is a sectional view of the sealing seat and the second sealing element of the present application;

[0041] Figure 14 It is a sectional view of the sealing seat and the second sealing element of the present application;

[0042] Figure 15 It is a sectional view of the second sealing element of the present application;

[0043] Figure 16 It is a structural view of the intermediate plate and the buffer ring of the present application.

[0044] In the figure: 1, the roller cylinder; 2, the roller shaft; 3, the cover; 31, the connecting edge; 32, the annular cover; 33, the sealing pressure lip; 4, the mounting seat; 5, the bearing; 6, the sealing seat; 7, the first sealing element; 71, the inner cover; 72, the outer cover; 721, the cover body; 722, the protruding part; 723, the first annular groove; 73, the first spiral element; 74, the second spiral element; 741, the head; 742, the gradual change part; 743, the connecting part; 744, the fixed part; 745, the groove; 8, the second sealing element; 81, the clamping plate; 82, the intermediate plate; 83, the buffer ring; 831, the second annular groove; 84, the intermediate chamber; 841, the first flow-through gap; 85, the third annular groove; 851, the second flow-through gap; 86, the annular connecting element; 87, the arc-shaped rubber element; 871, the embedded head. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0046] Please refer to Figures 1-16 The present application provides a technical solution:

[0047] The waterproof type carrier roller structure comprises a carrier roller cylinder 1 and a carrier roller shaft 2, and mounting seats 4 are fixedly arranged at both ends of the carrier roller cylinder 1, wherein, in the embodiment, the mounting seats 4 and the carrier roller cylinder 1 are connected and fixed in a threaded mode, and in addition, sealing rings can be arranged between the mounting seats 4 and the carrier roller cylinder 1 to improve the sealing performance. The carrier roller shaft 2 is coaxially arranged through the carrier roller cylinder 1 and the mounting seats 4 and is rotationally connected with the mounting seats 4 through bearings 5, that is, the carrier roller cylinder 1 is coaxially and rotationally connected with the carrier roller shaft 2 through the bearings 5.

[0048] The above are all prior art, which will not be described in detail, and the difference from the prior art is that:

[0049] In the technical solution, the mounting seats 4 are sealingly fixed with sealing seats 6; in the embodiment, the sealing seats 6 and the mounting seats 4 can be connected through threads, and similarly, the sealing seats 6 and the mounting seats 4 can also be connected through sealing rings to improve the sealing performance therebetween.

[0050] The first sealing members 7 and the second sealing members 8 are sequentially arranged in the sealing seats 6 along the axial direction of the carrier roller shaft 2, and the mounting seats 4 are provided with the gland covers 3 on one end surface, wherein the first sealing members 7 are arranged at positions close to the end portions of the carrier roller cylinder 1. The second sealing members 8 are similar to the sealing sealing structure, but the dustproof and waterproof effects thereof are relatively better than those of the prior art, and the specific structure and working principle thereof will be described in detail below. The gland covers 3 are similar to the lip-shaped sealing of the prior art, but the dustproof and waterproof effects thereof are relatively better than those of the prior art, and the specific structure and working principle thereof will be described in detail below. The first sealing members 7 are arranged between the gland covers 3 and the second sealing members 8 and are used for playing a dustproof and waterproof role after the gland covers 3 are damaged, and the specific structure and working principle thereof will be described in detail below.

[0051] In the technical solution, the gland covers 3 are arranged in the interiors of the carrier roller cylinders 1, and the end portions thereof do not protrude from the end surfaces of the carrier roller cylinders 1, and specifically, the gland covers 3 comprise connecting rims 31, annular covers 32 and two sealing compression lips 33, wherein the connecting rims 31 are fixedly connected with one end surface of the mounting seats 4, and the connecting rims 31 are integrally arranged on the outer peripheries of the annular covers 32, the connecting rims 31 and the annular covers 32 can be made of stainless steel, and the sealing compression lips 33 are fixedly arranged on the end surface of the annular cover 32 close to the first sealing members 7; the material of the sealing compression lips 33 is not limited herein and can be rubber or polyurethane.

[0052] In the technical solution, the first sealing member 7 comprises an inner cover 71, an outer cover 72, a first spiral member 73 and a second spiral member 74. The outer periphery of the inner cover 71 is sealingly fixed on the inner circumferential wall of the sealing seat 6, for example, the inner cover 71 is sealingly connected with the sealing seat 6 by extrusion or interference fit, etc. The inner periphery of the inner cover 71 does not contact the carrier roller shaft 2, that is, there is a gap between the inner periphery of the inner cover 71 and the carrier roller shaft 2. The inner periphery of the outer cover 72 is sealingly fixed on the carrier roller shaft 2, for example, the inner periphery of the outer cover 72 is sealingly and fixedly connected with the outer circumferential surface of the carrier roller shaft 2 by interference fit. The distance between the outer periphery of the outer cover 72 and the inner circumferential wall of the sealing seat 6 is 0.8-1.5mm. Since the sealing seat 6 rotates with the carrier roller 1 during conveying, sliding wear between the outer cover 72 and the sealing seat 6 can be prevented. The outer cover 72 can be made of stainless steel.

[0053] In the technical solution, the outer cover 72 comprises an integrally formed cover body 721 and a protruding portion 722. The thickness of the cover body 721 and the protruding portion 722 in the axial direction of the carrier roller shaft 2 is the same. A first annular groove 723 is formed between the cover body 721 and the protruding portion 722. Two sealing lips 33 are arranged on the inner and outer sides of the protruding portion 722, respectively, and are pressed against the cover body 721. The protruding portion 722 does not contact the annular cover 32. In this way, on the one hand, the pressing cover 3 is provided with two sealing lips 33, thus having double dustproof and waterproof insurance. When one of the sealing lips 33 loses its sealing effect due to wear or other factors, the other sealing lip 33 can still play a sealing role. In addition, in the technical solution, the two sealing lips 33 are arranged on the inner and outer sides of the protruding portion 722, respectively. In this way, in cooperation with the protruding portion 722, a bending type channel can be formed between the outer cover 72 and the annular cover 32, which has better dustproof and waterproof effect. For example, in the embodiment, water and dust in the external environment can enter between the annular cover 32 and the outer cover 72 from between the annular cover 32 and the carrier roller shaft 2. Therefore, the small-diameter sealing lip 33 will be worn by dust and other particulate matter first. Once the small-diameter sealing lip 33 loses its sealing ability due to wear, the water and dust in the external environment will first hit the circumferential surface of the protruding portion 722 after breaking through the sealing of the small-diameter sealing lip 33, thus achieving the first buffering of the water and dust and preventing all of the water and dust from entering between the large-diameter sealing lip 33 and the outer cover 72, thus prolonging the service life of the large-diameter sealing lip 33. On the other hand, the arrangement of the protruding portion 722 and the first annular groove 723 also enhances the dustproof performance of the first spiral member 73 and the second spiral member 74. The dustproof principle of the first spiral member 73 and the second spiral member 74 will be described in detail below.

[0054] The first spiral piece 73 and the second spiral piece 74 are fixed on one side of the inner cover 71 close to the outer cover 72, at least one first spiral piece 73 is arranged outside the second spiral piece 74, in the technical solution, two first spiral pieces 73 are arranged on the inner and outer sides of the second spiral piece 74, further, it can be obviously seen from the figure that the thickness of the first spiral piece 73 in the axial direction of the carrier roller shaft 2 is less than the thickness of the second spiral piece 74 in the axial direction of the carrier roller shaft 2, so that the distance between the first spiral piece 73 and the cover body 721 is 0.8-1.2mm, and the distance between the second spiral piece 74 and the protruding part 722 is 0.8-1.2mm; that is, the second spiral piece 74 extends into the inside of the first annular groove 723, and the purpose of such arrangement is that on the one hand, when the water and dust in the external environment break through the seal of the pressure cover 3 and enter between the inner cover 71 and the outer cover 72, the water and dust will first contact the first spiral piece 73, and after the buffering of the first spiral piece 73, a part of the water and dust will be intercepted, and the remaining water and dust will contact the second spiral piece 74, and similarly, after the buffering of the second spiral piece 74, a part of the water and dust will be intercepted again, in this way, efficient interception of water and dust and other impurities is realized, at the same time, after multiple changes in direction and pressure attenuation, the penetration probability of water and dust and other impurities is greatly reduced; on the other hand, since the thickness of the second spiral piece 74 is greater than the thickness of the first annular groove 723, the second spiral piece 74 cooperates with the protruding part 722 to change the penetration path of water and dust and other impurities again, and the protection effect is good; in addition, since the inner cover 71, the first spiral piece 73 and the second spiral piece 74 are fixedly connected with the carrier roller drum 1, the first spiral piece 73 and the second spiral piece 74 will rotate with the carrier roller drum 1, during this process, since the first spiral piece 73 and the second spiral piece 74 are spiral, the centrifugal force generated during rotation will make water and dust and other impurities move outward along the spiral direction of the first spiral piece 73 or the second spiral piece 74, that is, water and dust and other impurities are thrown out of the inner cover 71 and the outer cover 72, and the protection effect is better.

[0055] Further, in the technical solution, the first spiral part 73 and the second spiral part 74 each include a head part 741, a gradient part 742, a connecting part 743 and a fixed part 744 which are integrally arranged, so that the head part 741, the gradient part 742, the connecting part 743 and the fixed part 744 jointly form a spiral groove 745; the spiral groove 745 can be used to collect water and impurities such as dust, and meanwhile, the spiral groove 745 has the effect of limiting the moving path of the impurities in the process of being thrown outward under the centrifugal force; the head part 741 is close to the outer cover 72, and the fixed part 744 is fixed on the inner cover 71. The specific material of the first spiral part 73 and the second spiral part 74 is not limited, for example, in some embodiments, the first spiral part 73 and the second spiral part 74 can be made of rubber material.

[0056] The specific structure and working principle of the second sealing part 8 will be described below.

[0057] Specifically, the second sealing part 8 includes an intermediate plate 82 and two clamping plates 81 clamped on both sides of the intermediate plate 82, and the specific materials of the clamping plates 81 and the intermediate plate 82 are not limited here, for example, the clamping plates 81 and the intermediate plate 82 can be made of hard plastic or stainless steel material.

[0058] The outer periphery of the clamping plate 81 is sealingly connected with the inner surface of the sealing seat 6, for example, the outer periphery of the clamping plate 81 and the inner surface of the sealing seat 6 can be sealingly connected through interference fit; the inner periphery of the clamping plate 81 does not contact the carrier roller shaft 2, so as to avoid relative wear between the clamping plate 81 and the carrier roller shaft 2. The inner periphery of the intermediate plate 82 is sealingly and fixedly connected with the carrier roller shaft 2, for example, the inner periphery of the intermediate plate 82 and the carrier roller shaft 2 can be sealingly connected through interference fit.

[0059] The two clamping plates 81 form a middle chamber 84 after being closed together, the intermediate plate 82 is located inside the middle chamber 84 and forms a first flow-through gap 841 between the inner surface of the middle chamber 84; the first flow-through gap 841 has the effect of preventing relative wear between the clamping plate 81 and the intermediate plate 82.

[0060] The intermediate plate 82 is fixedly provided with a buffer ring 83 on both sides, the clamping plate 81 is provided with a third annular groove 85 at the position corresponding to the buffer ring 83, and after the two clamping plates 81 are closed together, the buffer ring 83 is located inside the third annular groove 85 and forms a second flow-through gap 851 between the inner surface of the third annular groove 85; similarly, the second flow-through gap 851 is used to prevent wear between the buffer ring 83 and the inner surface of the third annular groove 85, and to reduce the friction. In the above scheme, the buffer ring 83 cooperates with the third annular groove 85 to change the penetration path of the impurities.

[0061] Further, the outer surface of the buffer ring 83 is provided with a plurality of second annular grooves 831, the second annular grooves 831 are used to buffer the foreign matters (or water and dust and other impurities) flowing between the buffer ring 83 and the third annular groove 85, further improving the dustproof and waterproof effect.

[0062] In addition, the buffer ring 83 is fixedly connected with the intermediate plate 82 through the annular connecting piece 86, the buffer ring 83 and the annular connecting piece 86 are integrally formed, and the buffer ring 83 and the annular connecting piece 86 can be fixed on the intermediate plate 82 by welding; the notch position of the third annular groove 85 is fixedly provided with two arc-shaped rubber pieces 87, the two arc-shaped rubber pieces 87 and the buffer ring 83 form a third flow gap, the second flow gap 851 cooperates with the third flow gap to form a fourth flow gap in the form of an open ring, and the two ends of the fourth flow gap are communicated with the first flow gap 841.

[0063] In the above scheme, first, the buffer ring 83 and the third annular groove 85 can prolong the penetration path of the impurities, then, the second annular groove 831 is arranged on the buffer ring 83, which can interfere with the penetration process of the impurities along the second flow gap 851, for example, the impurities hitting the inside of the second annular groove 831 will greatly reduce the speed, thereby improving the overall waterproof and dustproof effect; then, two arc-shaped rubber pieces 87 are arranged at the notch position of the third annular groove 85, so as to form a fourth flow gap in the form of an open ring around the buffer ring 83, which can greatly reduce the penetration speed of the impurities; in addition, the arc-shaped rubber piece 87 has elasticity, so that the buffer ring 83 is convenient to install and disassemble.

[0064] Further, the arc-shaped rubber piece 87 is integrally provided with an embedded head 871, the embedded head 871 is embedded in the embedded groove on the inner surface of the third annular groove 85, so as to facilitate the installation and disassembly of the arc-shaped rubber piece 87.

[0065] Also includes a belt conveyor, the belt conveyor comprising the waterproof idler structure.

[0066] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A waterproof type carrier roller structure, comprising a carrier roller cylinder and a carrier roller shaft, both ends of the carrier roller cylinder are sealingly fixed with mounting seats, the carrier roller shaft is coaxially penetrated through the carrier roller cylinder and the mounting seats, and is rotationally connected with the mounting seats through bearings, characterized in that, The interior of the mounting seat is sealingly fixed with a sealing seat; The interior of the sealing seat is sequentially provided with a first sealing member and a second sealing member along the axial direction of the supporting roller shaft, and one end surface of the mounting seat is provided with a gland; The gland comprises a connecting rim, an annular cover and two sealing pressure lips, wherein the connecting rim is fixedly connected with one end surface of the mounting seat, the connecting rim is integrally arranged on the outer periphery of the annular cover, and the sealing pressure lips are fixedly arranged on the end surface of the annular cover close to the first sealing member; The first sealing member comprises an inner cover, an outer cover, a first spiral member and a second spiral member, the outer periphery of the inner cover is sealingly fixed on the inner circumferential wall of the sealing seat, and the inner periphery of the inner cover is not in contact with the supporting roller shaft, the inner periphery of the outer cover is sealingly fixed on the supporting roller shaft, and the spacing between the outer periphery of the outer cover and the inner circumferential wall of the sealing seat is 0.8-1.5mm; The outer cover comprises an integrally formed cover body and a protruding portion, and a first annular groove is formed between the cover body and the protruding portion; The first spiral member and the second spiral member are both fixed on one side of the inner cover close to the outer cover, at least one first spiral member is arranged outside the second spiral member, the spacing between the first spiral member and the cover body is 0.8-1.2mm, and the spacing between the second spiral member and the protruding portion is 0.8-1.2mm; The two sealing pressure lips are respectively arranged on the inner and outer sides of the protruding portion, and are tightly pressed on the cover body, and the protruding portion is not in contact with the annular cover.

2. The water-proof idler structure according to claim 1, wherein The first spiral member and the second spiral member both comprise a head portion, a gradual change portion, a connecting portion and a fixed portion which are integrally arranged, and the head portion, the gradual change portion, the connecting portion and the fixed portion cooperatively form a spiral-shaped groove; the head portion is close to the outer cover, and the fixed portion is fixed on the inner cover.

3. The water-proof idler structure according to claim 1, wherein The second sealing member comprises an intermediate plate and two clamping plates clamped on both sides of the intermediate plate, the outer periphery of the clamping plate is sealingly connected with the inner surface of the sealing seat, and the inner periphery of the clamping plate is not in contact with the supporting roller shaft, and the inner periphery of the intermediate plate is sealingly and fixedly connected with the supporting roller shaft; An intermediate cavity is formed between the two clamping plates, the intermediate plate is located inside the intermediate cavity, and a first flow-through gap is formed between the inner surface of the intermediate cavity and the intermediate plate; A buffer ring is fixedly arranged on both sides of the intermediate plate, a third annular groove is formed in the clamping plate corresponding to the position of the buffer ring, and the buffer ring is arranged inside the third annular groove and forms a second flow-through gap between the inner surface of the third annular groove and the buffer ring.

4. The water-proof idler structure according to claim 3, wherein A plurality of second annular grooves are formed on the outer surface of the buffer ring, and the second annular grooves are used for buffering foreign matters flowing between the buffer ring and the third annular groove.

5. The water-proof idler structure according to claim 3, wherein The buffer ring is fixedly connected with the intermediate plate through an annular connecting member; Two arc-shaped rubber members are fixedly arranged at the slot opening position of the third annular groove, a third flow-through gap is formed between the arc-shaped rubber members and the buffer ring, the second flow-through gap cooperates with the third flow-through gap to form a fourth flow-through gap in the form of an unsealed circular ring, and both ends of the fourth flow-through gap are in communication with the first flow-through gap.

6. The water-proof idler structure according to claim 5, wherein An embedded head is integrally formed on the arc-shaped rubber member, and the embedded head is embedded in an embedded groove formed in the inner surface of the third annular groove.

7. The water-proof idler structure according to claim 1, wherein The mounting base and the carrier roller are connected by threads, and the sealing base and the mounting base are connected by threads.

8. The water-proof idler structure according to claim 1, wherein The connecting rim, the annular cover and the outer cover are made of stainless steel.

9. Belt conveyor, characterized in that The belt conveyor comprises the waterproof carrier roller structure according to any one of claims 1-8.

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