Waterproof carrier roller structure and belt conveyor thereof

Abstract

The invention relates to the technical field of conveying belt carrier rollers, in particular to a waterproof carrier roller structure and a belt conveyor comprising the same, the waterproof carrier roller structure comprises a carrier roller cylinder and a carrier roller shaft, mounting seats are hermetically fixed at two ends of the carrier roller cylinder, and the carrier roller shaft coaxially penetrates through the carrier roller cylinder and the mounting seats and is rotatably connected with the mounting seats through bearings. A sealing seat is fixed in the mounting seat in a sealing manner; a first sealing piece and a second sealing piece are sequentially arranged in the sealing base in the axial direction of the carrier roller shaft, and a gland is arranged on one end face of the installation base. The gland comprises a connecting edge, an annular cover and two sealing pressing lips, the connecting edge is fixedly connected with one end face of the mounting base, the connecting edge is integrally arranged on the periphery of the annular cover, and the sealing pressing lips are fixedly arranged on the end face, close to the first sealing piece, of the annular cover; the first sealing piece comprises an inner cover, an outer cover, a first spiral piece and a second spiral piece. By means of the first spiral piece and the second spiral piece, the permeability of impurities such as water and dust is greatly reduced.

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 concepts.

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

[0007] Preferably, the first spiral member and the second spiral member both 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.

[0008] 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 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, 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.

[0009] Preferably, 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.

[0010] Preferably, the buffer ring is fixedly connected to the intermediate plate via an annular connector; Two arc-shaped rubber parts are fixedly installed at the opening of the third annular groove. The two arc-shaped rubber parts and the buffer ring form a third flow gap. The second flow gap and the third flow gap form a fourth flow gap that is not closed and is circular. Both ends of the fourth flow gap are connected to the first flow gap.

[0011] Preferably, the arc-shaped rubber part is integrally formed with an insert head, which is embedded in the insert groove opened on the inner surface of the third annular groove.

[0012] Preferably, the mounting base and the idler roller, as well as the sealing base and the mounting base, are connected by threads.

[0013] Preferably, the pressure cap is housed inside the idler roller, and the connecting edge, the annular cap, and the outer cap are all made of stainless steel.

[0014] A belt conveyor, the belt conveyor including the aforementioned waterproof idler structure.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the cap is provided with two sealing lips, thus providing double-layer dust and water protection. Even if one sealing lip loses its sealing effect due to wear or other factors, the other sealing lip can still continue to perform the sealing function. In addition, the two sealing lips in this technical solution are respectively located on the inner and outer sides of the protrusion. In this way, together with the protrusion, a bent channel can be formed between the outer cover and the annular cover, which has a better dust and water protection effect. For example, in this embodiment, water and dust in the external environment will enter between the annular cover and the idler roller shaft and between the annular cover and the outer cover. Therefore, the small-diameter sealing lip will wear down first due to dust and other particles. Once the small-diameter sealing lip loses its sealing ability due to wear, water and dust in the external environment will first impact the circumference of the protrusion after breaking through the seal of the small-diameter sealing lip, thus achieving initial buffering of water and dust and preventing all water and dust from entering between the large-diameter sealing lip and the outer cover, thereby extending the service life of the large-diameter sealing lip.

[0016] In this invention, when water and dust from the external environment breach the seal of the gland and enter between the inner and outer covers, these water and dust first come into contact with the first spiral component. After being buffered by the first spiral component, a portion of the water and dust is retained. The remaining water and dust then come into contact with the second spiral component, and similarly, after being buffered by the second spiral component, a portion of the water and dust is retained again. This achieves efficient retention of water and dust impurities. Simultaneously, through multiple directional changes and pressure attenuation, the probability of water and dust penetration is significantly reduced. Furthermore, because the thickness of the second spiral component is greater than... The thickness of the first annular groove allows the second spiral component, in conjunction with the protrusion, to further alter the penetration path of water and dust, resulting in excellent protection. Furthermore, since the inner cover, the first and second spiral components are fixedly connected to the idler roller, they rotate together with the roller. During this process, the centrifugal force generated by the spiral shape of the first and second spiral components causes water and dust to move outwards along the spiral direction of either the first or second spiral component, effectively throwing them out between the inner and outer covers, thus enhancing the protective effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the idler roller shaft, pressure cap, mounting base, bearing and sealing seat of the present invention; Figure 3 This is a schematic diagram of the roller shaft, pressure cap, mounting base, bearing, and sealing seat of the present invention from another perspective; Figure 4 This is a cross-sectional three-dimensional structural diagram of the pressure cap of the present invention; Figure 5 This is a cross-sectional view of the cap structure of the present invention; Figure 6 This is a partial cross-sectional structural diagram of the pressure cap of the present invention; Figure 7 This is a schematic diagram of the structure of the sealing seat, the first sealing element, and the second sealing element of the present invention; Figure 8 This is a schematic diagram of the structure of the first sealing element of the present invention; Figure 9 This is a cross-sectional structural schematic diagram of the first sealing element of the present invention; Figure 10 This is a partial cross-sectional structural diagram of the first sealing element of the present invention; Figure 11 This is a schematic diagram of the cross-sectional structure of the second spiral component of the present invention; Figure 12 This is a schematic diagram of the structure of the sealing seat and the second sealing element of the present invention; Figure 13 This is a cross-sectional three-dimensional structural diagram of the sealing seat and the second sealing element of the present invention; Figure 14 This is a cross-sectional structural schematic diagram of the sealing seat and the second sealing element of the present invention; Figure 15 This is a partial cross-sectional structural diagram of the second sealing element of the present invention; Figure 16 This is a schematic diagram of the structure of the intermediate plate and buffer ring of the present invention.

[0018] In the diagram: 1. Idler roller; 2. Idler roller shaft; 3. Cover; 31. Connecting edge; 32. Annular cover; 33. Sealing lip; 4. Mounting seat; 5. Bearing; 6. Sealing seat; 7. First seal; 71. Inner cover; 72. Outer cover; 721. Cover body; 722. Protrusion; 723. First annular groove; 73. First spiral component; 74. Second spiral component; 741. Head; 742. Gradient part; 743. Connecting part; 744. Fixing part; 745. Groove; 8. Second seal; 81. Clamping plate; 82. Intermediate plate; 83. Buffer ring; 831. Second annular groove; 84. Intermediate chamber; 841. First flow gap; 85. Third annular groove; 851. Second flow gap; 86. Annular connector; 87. Arc-shaped rubber component; 871. Insert head. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-16 The present invention provides a technical solution: The waterproof idler roller structure includes an idler roller cylinder 1 and an idler roller shaft 2. Both ends of the idler roller cylinder 1 are sealed and fixed with mounting seats 4. In this embodiment, the mounting seats 4 and the idler roller cylinder 1 can be connected and fixed by threads. Furthermore, a sealing ring can be provided between the mounting seats 4 and the idler roller cylinder 1 to improve sealing performance. The idler roller shaft 2 coaxially passes through the idler roller cylinder 1 and the mounting seats 4, and is rotatably connected to the mounting seats 4 via bearings 5. That is, the idler roller cylinder 1 achieves a coaxial rotatable connection with the idler roller shaft 2 through the bearings 5.

[0021] The above are all existing technologies and will not be elaborated upon here. The difference from existing technologies is: In this technical solution, the mounting base 4 is internally sealed with a sealing seat 6; in this embodiment, the sealing seat 6 and the mounting base 4 can be connected by threads. Similarly, the sealing performance between the sealing seat 6 and the mounting base 4 can also be improved by setting a sealing ring.

[0022] Inside the sealing seat 6, along the axial direction of the idler roller shaft 2, a first sealing element 7 and a second sealing element 8 are sequentially arranged. A pressure cap 3 is provided on one end face of the mounting seat 4. The first sealing element 7 is located near the end of the idler roller cylinder 1. The second sealing element 8 is similar to a sealing structure, but its dustproof and waterproof effect is better than existing technologies. Its specific structure and working principle are described in detail below. The pressure cap 3 is similar to a lip seal in existing technologies, but its dustproof and waterproof effect is better than existing technologies. Its specific structure and working principle are described in detail below. The first sealing element 7 is located between the pressure cap 3 and the second sealing element 8, and is used to provide dustproof and waterproof protection after the pressure cap 3 is damaged. Its specific structure and working principle are described in detail below.

[0023] In this technical solution, the pressure cap 3 is housed inside the idler roller 1, and its end does not protrude from the end face of the idler roller 1. Specifically, the pressure cap 3 includes a connecting edge 31, an annular cover 32, and two sealing lips 33. The connecting edge 31 is fixedly connected to one end face of the mounting base 4, and the connecting edge 31 is integrally disposed on the outer periphery of the annular cover 32. Both the connecting edge 31 and the annular cover 32 can be made of stainless steel. The sealing lips 33 are fixedly disposed on the end face of the annular cover 32 near the first sealing element 7. The material of the sealing lips 33 is not limited here and can be rubber or polyurethane, etc.

[0024] In this technical solution, the first sealing element 7 includes an inner cover 71, an outer cover 72, a first spiral element 73, and a second spiral element 74. The outer periphery of the inner cover 71 is sealed and fixed to the inner wall of the sealing seat 6. For example, the inner cover 71 achieves a sealing connection with the sealing seat 6 through compression or interference fit. The inner periphery of the inner cover 71 does not contact the idler roller shaft 2, meaning there is a gap between the inner periphery of the inner cover 71 and the idler roller shaft 2. The inner periphery of the outer cover 72 is sealed and fixed to the idler roller shaft 2. For example, the inner periphery of the outer cover 72 achieves a sealed and fixed connection with the outer surface of the idler roller shaft 2 through interference fit. The distance between the outer periphery of the outer cover 72 and the inner wall of the sealing seat 6 is 0.8-1.5mm. Since the sealing seat 6 rotates continuously with the idler roller 1 during the conveying process, this prevents sliding wear between the outer cover 72 and the sealing seat 6. The outer cover 72 can be made of stainless steel.

[0025] In this technical solution, the outer cover 72 includes an integrally formed cover body 721 and a protrusion 722. The cover body 721 and the protrusion 722 have the same thickness along the axial direction of the roller shaft 2. A first annular groove 723 is formed between the cover body 721 and the protrusion 722. Two sealing lips 33 are respectively disposed on the inner and outer sides of the protrusion 722, and the sealing lips 33 are pressed against the cover body 721. The protrusion 722 does not contact the annular cover 32. With this arrangement, on the one hand, the cover 3 is provided with two sealing lips 33, thus providing double-layer dust and water protection. If one sealing lip 33 loses its sealing effect due to wear or other factors, the other sealing lip 33 can still continue to play a sealing role. In addition, the two sealing lips 33 in this technical solution are respectively disposed on the inner and outer sides of the protrusion 722. Thus, in conjunction with the protrusion 722, a bent channel can be formed between the outer cover 72 and the annular cover 32, which provides protection against dust and water. The dust and water resistance is better. For example, in this embodiment, water and dust from the external environment will enter between the annular cover 32 and the outer cover 72 from between the annular cover 32 and the idler roller shaft 2. Therefore, the small-diameter sealing lip 33 will be worn first by dust and other particles. Once the small-diameter sealing lip 33 loses its sealing ability due to wear, water and dust from the external environment will first impact the circumferential surface of the protrusion 722 after breaking through the seal of the small-diameter sealing lip 33. This achieves the initial buffering of water and dust, preventing all water and dust from entering between the large-diameter sealing lip 33 and the outer cover 72, thus extending the service life of the large-diameter sealing lip 33. On the other hand, the protrusion 722 and the first annular groove 723 also enhance the dustproof performance of the first spiral member 73 and the second spiral member 74. The specific details will be described in detail below when describing the dustproof principle of the first spiral member 73 and the second spiral member 74.

[0026] The first spiral component 73 and the second spiral component 74 are both fixed to one side of the inner cover 71 near the outer cover 72. At least one first spiral component 73 surrounds the outer side of the second spiral component 74. In this technical solution, a total of two first spiral components 73 are provided, which are respectively located on the inner and outer sides of the second spiral component 74. Furthermore, it can be clearly seen from the figure that in this technical solution, the thickness of the first spiral component 73 in the axial direction of the idler roller shaft 2 is less than the thickness of the second spiral component 74 in the axial direction of the idler roller shaft 2. Therefore, the following can be achieved: the first spiral component 73... The distance between the spiral member 73 and the cover 721 is 0.8-1.2mm, and the distance between the second spiral member 74 and the protrusion 722 is 0.8-1.2mm; that is, the second spiral member 74 extends into the interior of the first annular groove 723. The purpose of this arrangement is that, on the one hand, when water and dust from the external environment break through the seal of the pressure cap 3 and enter between the inner cover 71 and the outer cover 72, this water and dust will first come into contact with the first spiral member 73. After being buffered by the first spiral member 73, a portion of the water and dust will be retained. The remaining water and dust will come into contact with the second spiral component 74. Similarly, after being buffered by the second spiral component 74, some of the water and dust will be retained again. This achieves efficient retention of impurities such as water and dust. Simultaneously, through multiple directional changes and pressure attenuation, the probability of water and dust penetration is significantly reduced. Furthermore, because the thickness of the second spiral component 74 is greater than the thickness of the first annular groove 723, the second spiral component 74, in conjunction with the protrusion 722, can further alter the penetration path of water and dust, enhancing the protective effect. Okay; In addition, since the inner cover 71, the first spiral component 73 and the second spiral component 74 are fixedly connected to the roller cylinder 1, the first spiral component 73 and the second spiral component 74 will rotate together with the roller cylinder 1. During this process, since the first spiral component 73 and the second spiral component 74 are spiral-shaped, the centrifugal force generated during the rotation will cause water and dust and other impurities to move outward along the spiral direction of the first spiral component 73 or the second spiral component 74, that is, to throw water and dust and other impurities out from between the inner cover 71 and the outer cover 72, so that the protective effect is better.

[0027] Furthermore, in this technical solution, both the first spiral member 73 and the second spiral member 74 include an integrally formed head 741, a gradient portion 742, a connecting portion 743, and a fixing portion 744. Thus, the head 741, the gradient portion 742, the connecting portion 743, and the fixing portion 744 work together to form a spiral groove 745. The groove 745 can be used to collect water, dust, and other impurities. Simultaneously, as the impurities are flung outward under centrifugal force, the groove 745 also has the effect of limiting the movement path of the impurities. The head 741 is close to the outer cover 72, and the fixing portion 744 is fixed to the inner cover 71. The specific materials of the first spiral member 73 and the second spiral member 74 are not limited. For example, in some embodiments, the first spiral member 73 and the second spiral member 74 can be made of rubber.

[0028] The specific structure and working principle of the second sealing element 8 are described below.

[0029] Specifically, the second sealing element 8 includes an intermediate plate 82 and two clamping plates 81 sandwiched on both sides of the intermediate plate 82. 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.

[0030] The outer periphery of the clamping plate 81 is sealed to 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 sealed by an interference fit. The inner periphery of the clamping plate 81 does not contact the idler roller shaft 2 to avoid relative wear between the clamping plate 81 and the idler roller shaft 2. The inner periphery of the intermediate plate 82 is sealed and fixedly connected to the idler roller shaft 2. For example, the inner periphery of the intermediate plate 82 and the idler roller shaft 2 can be sealed by an interference fit.

[0031] After the two clamping plates 81 are joined together, an intermediate cavity 84 is formed. The intermediate plate 82 is located inside the intermediate cavity 84 and forms a first flow gap 841 between it and the inner surface of the intermediate cavity 84. The first flow gap 841 has the function of preventing relative wear between the clamping plates 81 and the intermediate plate 82.

[0032] Buffer rings 83 are fixedly installed on both sides of the intermediate plate 82. A third annular groove 85 is formed in the clamping plate 81 corresponding to the position of the buffer rings 83. After the two clamping plates 81 are closed, the buffer rings 83 are located inside the third annular groove 85, forming a second flow gap 851 between them and the inner surface of the third annular groove 85. Similarly, the second flow gap 851 is used to prevent wear between the buffer rings 83 and the inner surface of the third annular groove 85, while also reducing friction. In the above scheme, the buffer rings 83, in conjunction with the third annular groove 85, can change the penetration path of impurities.

[0033] Furthermore, the outer surface of the buffer ring 83 is provided with several second annular grooves 831. The second annular grooves 831 are used to buffer foreign objects (or impurities such as water and dust) flowing between the buffer ring 83 and the third annular groove 85, thereby further improving the dustproof and waterproof effect.

[0034] In addition, the buffer ring 83 is fixedly connected to the intermediate plate 82 through the annular connector 86. The buffer ring 83 and the annular connector 86 are integrally formed and can be fixed to the intermediate plate 82 by welding. Two arc-shaped rubber parts 87 are fixedly installed at the groove opening of the third annular groove 85. The two arc-shaped rubber parts 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 non-closed annular fourth flow gap. Both ends of the fourth flow gap are connected to the first flow gap 841.

[0035] In the above scheme, firstly, the buffer ring 83 and the third annular groove 85 can extend the penetration path of impurities. Then, by setting a second annular groove 831 on the buffer ring 83, the second annular groove 831 can interfere with the penetration process of impurities along the second flow gap 851. For example, the speed of impurities hitting the inside of the second annular groove 831 will be greatly reduced, thereby improving the overall waterproof and dustproof effect. Afterwards, by setting two arc-shaped rubber parts 87 at the groove opening of the third annular groove 85, a non-closed annular fourth flow gap can be formed around the buffer ring 83, which can further reduce the penetration speed of impurities. In addition, the arc-shaped rubber parts 87 are elastic, so the buffer ring 83 is easy to install and remove.

[0036] Furthermore, an insert head 871 is integrally formed on the arc-shaped rubber part 87. The insert head 871 is embedded in the insert groove opened on the inner surface of the third annular groove 85, which facilitates the installation and removal of the arc-shaped rubber part 87.

[0037] It also includes a belt conveyor that incorporates the aforementioned waterproof idler structure.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waterproof idler roller structure, comprising an idler roller cylinder and an idler roller shaft, wherein both ends of the idler roller cylinder are sealed and fixed with mounting seats, and the idler roller shaft coaxially passes through the idler roller cylinder and the mounting seats, and is rotatably connected to the mounting seats via bearings, characterized in that, The mounting base is internally sealed and fixed with a sealing seat; The sealing seat is provided with a first sealing element and a second sealing element in sequence along the axial direction of the roller shaft, and a pressure cap is provided on one end face of the mounting seat; The gland includes a connecting edge, an annular cover, and two sealing lips. The connecting edge is fixedly connected to one end face of the mounting base. The connecting edge is integrally disposed on the outer periphery of the annular cover. The sealing lips are fixedly disposed 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 component, and a second spiral component. The outer periphery of the inner cover is sealed and fixed on the inner peripheral wall of the sealing seat, and the inner periphery of the inner cover does not contact the roller shaft. The inner periphery of the outer cover is sealed and fixed on the roller shaft, and the distance between the outer periphery of the outer cover and the inner peripheral wall of the sealing seat is 0.8-1.5mm. The outer cover includes an integrally formed cover body and a protrusion, and a first annular groove is formed between the cover body and the protrusion. The first and second spiral components are both fixed to one side of the inner cover near the outer cover. At least one first spiral component surrounds the outer side of the second spiral component. The distance between the first spiral component and the cover body is 0.8-1.2 mm, and the distance between the second spiral component and the protrusion is 0.8-1.2 mm. The two sealing lips are respectively disposed on the inner and outer sides of the protrusion, and the sealing lips are pressed tightly on the cover body, and the protrusion does not contact the annular cover.

2. The waterproof idler roller structure according to claim 1, characterized in that, Both the first and second spiral components include an integrally formed head, a gradient portion, a connecting portion, and a fixing portion, which together form a spiral groove; the head is close to the outer cover, and the fixing portion is fixed to the inner cover.

3. The waterproof idler roller structure according to claim 1, characterized in that, The second sealing element includes an intermediate plate and two clamping plates sandwiched on both sides of the intermediate plate. The outer periphery of the clamping plates is sealed to the inner surface of the sealing seat, and the inner periphery of the clamping plates does not contact the roller shaft. The inner periphery of the intermediate plate is sealed and fixedly connected to the roller shaft. An intermediate chamber is formed between the two clamping plates, the intermediate plate is located inside the intermediate chamber, and a first flow gap is formed between the intermediate plate and the inner surface of the intermediate chamber; Both sides of the intermediate plate are fixedly provided with buffer rings, and the clamping plate is provided with a third annular groove corresponding to the position of the buffer ring. The buffer ring is disposed inside the third annular groove and forms a second flow gap with the inner surface of the third annular groove.

4. The waterproof idler roller structure according to claim 3, characterized in that, The outer surface of the buffer ring is provided with a plurality of second annular grooves, which are used to buffer foreign objects flowing between the buffer ring and the third annular groove.

5. The waterproof idler roller structure according to claim 3, characterized in that, The buffer ring is fixedly connected to the intermediate plate via an annular connector; Two arc-shaped rubber parts are fixedly installed at the opening of the third annular groove. The two arc-shaped rubber parts and the buffer ring form a third flow gap. The second flow gap and the third flow gap form a fourth flow gap that is not closed and is circular. Both ends of the fourth flow gap are connected to the first flow gap.

6. The waterproof idler roller structure according to claim 5, characterized in that, An insert head is integrally formed on the arc-shaped rubber part, and the insert head is embedded in the insert groove opened on the inner surface of the third annular groove.

7. The waterproof idler roller structure according to claim 1, characterized in that, The mounting base and the idler roller, as well as the sealing base and the mounting base, are all connected by threads.

8. The waterproof idler roller structure according to claim 1, characterized in that, The pressure cap is housed inside the idler roller, and the connecting edge, annular cap, and outer cap are all made of stainless steel.

9. A belt conveyor, characterized in that, The belt conveyor includes the waterproof idler structure described in any one of claims 1-8.

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