Riding wheel set and discharging device

Abstract

The utility model relates to the technical field of pressure filters, in particular to a riding wheel set and a discharging device. The riding wheel set comprises a riding wheel shaft, a riding wheel, a first sealing piece, a second sealing piece and a bearing assembly, a containing cavity is formed in the riding wheel, the riding wheel shaft comprises a rotating part and an abutting part, the rotating part is inserted into the containing cavity, an installation cavity is formed between the rotating part and the riding wheel, and the abutting part is inserted into the installation cavity. The bearing assembly is installed in the installation cavity, and the rotating part is in running fit with the riding wheel through the bearing assembly. According to the utility model, the first sealing element is arranged between the abutting part of the riding wheel shaft and one end of the riding wheel to hermetically connect the abutting part with one end of the riding wheel, and the second sealing element is arranged between the first outer wall surface of the rotating part of the riding wheel shaft and the first inner wall surface of the riding wheel for secondary sealing; and the sealing effect between the riding wheel and the riding wheel shaft is better due to the dual sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure filters, in particular to a supporting wheel assembly and a discharging device. Background Art

[0002] In the filtering and dehydration process of materials such as phosphate tailings and iron ore concentrate, under the action of the pressure in the pressurized bin, the slurry in the tank forms a filter cake on the surface of the filter disc. After the filter cake is dried to reduce the moisture content, it is unloaded to the unloading area of the distribution valve and transported to the discharge device by the scraper conveyor. This operation is continuous. When a certain amount is reached, it is intermittently discharged out of the machine by the discharge device.

[0003] At present, the discharging device includes a gate, a driving mechanism, a frame and a roller group. The driving mechanism is arranged on one side of the frame to drive the gate to move. Multiple groups of roller groups are symmetrically installed on both sides of the frame. The multiple groups of roller groups are used to support the movement of the gate.

[0004] The supporting roller assembly includes a supporting roller, a supporting roller shaft, a baffle and a bearing. The supporting roller and the supporting roller shaft are rotatably connected through the bearing. The baffle is fixedly connected to the supporting roller shaft by bolts. The baffle and the supporting roller shaft cooperate to limit the axial movement of the supporting roller. The supporting roller and the supporting roller shaft are sealed by a sealing ring.

[0005] The above-mentioned sealing structure only performs one seal, and the sealing effect is poor. Materials and dust particles can easily invade the bearing between the supporting roller and the supporting roller shaft, which can easily cause bearing damage and supporting roller jamming, resulting in a high equipment failure rate and high operation and maintenance costs. Utility Model Content

[0006] (1) The problem to be solved by the present invention is: how to improve the sealing effect to prevent the bearing from being damaged and the supporting wheel from being stuck.

[0007] (2) Technical solution

[0008] The utility model provides a supporting roller assembly, comprising a supporting roller shaft, a supporting roller, a first sealing member, a second sealing member and a bearing assembly;

[0009] A receiving cavity is formed inside the supporting wheel;

[0010] The supporting roller shaft includes a rotating portion and an abutting portion, the rotating portion is inserted into the accommodating cavity, a mounting cavity is formed between the rotating portion and the supporting roller, the bearing assembly is mounted in the mounting cavity, and the rotating portion is rotatably engaged with the supporting roller through the bearing assembly;

[0011] One end of the supporting wheel is sealedly connected to the abutting portion via a first sealing member;

[0012] The rotating portion is provided with a first outer wall surface in contact with the abutting portion, and the accommodating cavity is provided with a first inner wall surface at one end close to the abutting portion;

[0013] The first outer wall surface and the first inner wall surface are sealed and connected via a second sealing member.

[0014] According to one embodiment of the present invention, the rotating portion includes a stepped shaft, and the abutting portion includes a connecting shaft;

[0015] A side of the connecting shaft connected to the stepped shaft forms a first sealing surface, a side of the supporting wheel close to the connecting shaft forms a second sealing surface, and the first sealing surface and the second sealing surface are sealed and connected via the first sealing member.

[0016] According to one embodiment of the present invention, a blind cover is provided at one end of the stepped shaft away from the connecting shaft, the blind cover is connected to the supporting wheel, and the blind cover is used to seal the installation chamber.

[0017] According to one embodiment of the present invention, a limiting structure is further included, wherein the limiting structure is used to limit the movement of the cover and the supporting wheel relative to the supporting wheel shaft along the direction from the abutting portion to the cover.

[0018] According to one embodiment of the present invention, the supporting wheel has a second inner wall surface and a third inner wall surface connected thereto, the second inner wall surface is arranged between the third inner wall surface and the first inner wall surface, the diameter of the second inner wall surface is smaller than the diameter of the third inner wall surface, and a first transition surface is formed between the second inner wall surface and the third inner wall surface;

[0019] The limiting structure includes a limiting ring groove provided at one end of the stepped shaft away from the connecting shaft, and an elastic washer is provided in the limiting ring groove;

[0020] The bearing assembly includes a first bearing, which is arranged between the elastic washer and the first transition surface, and two ends of the first bearing are respectively connected to the elastic washer and the first transition surface.

[0021] According to one embodiment of the present invention, it further comprises a fastener and a rubber ring, wherein the blind cover is connected to the supporting wheel via the fastener, and the blind cover is sealed to the supporting wheel via the rubber ring.

[0022] According to one embodiment of the present invention, the first sealing member is a felt ring.

[0023] According to one embodiment of the present invention, the second sealing member is a C-shaped sealing ring.

[0024] According to one embodiment of the present utility model, one end of the supporting roller shaft is connected to an oil filling pipe;

[0025] A first oil groove communicated with the oil filling pipe is provided in the supporting roller shaft, and a plurality of second oil grooves communicated with the installation chamber are connected to the first oil groove.

[0026] A discharging device comprises any one of the above-mentioned supporting wheel assemblies.

[0027] Beneficial effects of the utility model:

[0028] The first sealing member is provided between the abutting portion of the roller shaft and one end of the roller to seal the abutting portion and one end of the roller, and a second sealing member is installed between the first outer wall surface of the rotating portion of the roller shaft and the first inner wall surface of the accommodating cavity of the roller to perform secondary sealing. The double sealing effect makes the sealing effect between the roller and the roller shaft better, and materials and dust are not easy to invade into the bearing assembly between the roller shaft and the roller, thereby reducing the damage of the bearing assembly and the jamming of the roller, thereby reducing the equipment failure rate and the cost of operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A three-dimensional schematic diagram of a supporting roller assembly provided in an embodiment of the present utility model;

[0031] Figure 2 A schematic three-dimensional cross-sectional view of a supporting roller assembly provided in an embodiment of the present utility model;

[0032] Figure 3 A front cross-sectional schematic diagram of a supporting roller assembly provided in an embodiment of the present utility model;

[0033] Figure 4 A schematic cross-sectional view of a supporting roller, a supporting roller shaft, and an elastic washer provided in an embodiment of the present utility model;

[0034] Figure 5 A front view of a supporting roller shaft provided in an embodiment of the present utility model;

[0035] Figure 6 A cross-sectional view of a supporting wheel provided in an embodiment of the present utility model;

[0036] Figure 7 The embodiment of the present invention provides Figure 3 A magnified schematic diagram of part A;

[0037] Figure 8 The embodiment of the present invention provides Figure 4 Schematic diagram of the enlarged portion B.

[0038] Icons: 1. Support roller shaft; 101. First outer wall surface; 102. Connecting shaft; 103. First sealing surface; 104. Limiting ring groove; 105. First circular shaft; 106. Second circular shaft; 107. Third circular shaft; 108. Flange; 2. Support roller; 201. First inner wall surface; 202. Second sealing surface; 203. Second inner wall surface; 204. Third inner wall surface; 205. Fourth inner wall surface; 3. First sealing component; 4. Second sealing component; 5. Blind cover; 501. Rubber ring; 502. Screw; 6. Elastic washer; 7. First bearing; 8. Oil filling pipe; 9. First oil groove; 10. Second oil groove; 11. Combined needle roller bearing; 12. Annular oil groove. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Example 1:

[0041] like Figures 1-8 As shown, an embodiment of the present utility model provides a supporting roller assembly, including a supporting roller shaft 1, a supporting roller 2, a first seal 3, a second seal 4 and a bearing assembly;

[0042] An accommodating cavity is formed inside the supporting wheel 2;

[0043] The supporting roller shaft 1 includes a rotating portion and an abutting portion. The rotating portion is inserted into the accommodating cavity. A mounting cavity is formed between the rotating portion and the supporting roller 2. The bearing assembly is mounted in the mounting cavity. The rotating portion rotates with the supporting roller 2 through the bearing assembly.

[0044] One end of the supporting wheel 2 is sealed to the abutting portion via a first sealing member 3;

[0045] The rotating portion is provided with a first outer wall surface 101 connected to the abutting portion, and the accommodating cavity is provided with a first inner wall surface 201 at one end close to the abutting portion;

[0046] The first outer wall surface 101 and the first inner wall surface 201 are sealed and connected via the second sealing member 4 .

[0047] By setting a first seal 3 between the abutment part of the roller shaft 1 and one end of the roller 2, the abutment part and one end of the roller 2 are sealed and connected, and a second seal 4 is installed between the first outer wall surface 101 of the rotating part of the roller shaft 1 and the first inner wall surface 201 of the accommodating cavity of the roller 2 for secondary sealing. The double sealing effect makes the sealing effect between the roller 2 and the roller shaft 1 better, and materials and dust are not easy to invade into the bearing assembly between the roller shaft 1 and the roller 2, reducing the damage of the bearing assembly and the jamming of the roller 2, thereby reducing the equipment failure rate and the cost of operation and maintenance.

[0048] According to one embodiment of the present invention, Figure 8 As shown, the rotating portion includes a stepped shaft, and the abutting portion includes a connecting shaft 102;

[0049] The side where the connecting shaft 102 is connected to the stepped shaft forms a first sealing surface 103 , and the side of the supporting wheel 2 close to the connecting shaft 102 forms a second sealing surface 202 . The first sealing surface 103 and the second sealing surface 202 are sealed and connected via a first sealing member 3 .

[0050] According to one embodiment of the present invention, Figure 2 and Figure 3 As shown, a blind cover 5 is provided at one end of the stepped shaft away from the connecting shaft 102 . The blind cover 5 is connected to the supporting wheel 2 , and the blind cover 5 is used to seal the installation chamber.

[0051] By setting up a connection between the blind cover 5 and the supporting roller 2, instead of the traditional connection between the blind cover 5 and the supporting roller shaft 1, the sealing effect of the accommodating chamber is improved, and materials and dust are not easily introduced between the blind cover 5 and the supporting roller 2, thereby reducing damage to the bearing assembly and the occurrence of the supporting roller 2 getting stuck, thereby reducing the equipment failure rate.

[0052] According to one embodiment of the present invention, Figure 7 As shown, it also includes fasteners and a rubber ring 501 , the blind cover 5 is connected to the supporting wheel 2 via the fasteners, and the blind cover 5 is sealed to the supporting wheel 2 via the rubber ring 501 .

[0053] The fastener is a locking screw 502. Multiple threaded grooves are formed on the outer edge of the blind cover 5 along its circumference. Multiple screw holes are formed on the end surface of the supporting wheel 2 near the blind cover 5. The screw holes, threaded grooves, and locking screws 502 correspond one to one. The locking screws 502 pass through the screw holes and are screwed into the threaded grooves.

[0054] The length direction of the locking screw 502 is perpendicular to the axis direction of the supporting wheel 2;

[0055] A first annular groove is formed on the outer edge of the cover 5 . The inner side surface of the rubber ring 501 is located in the first annular groove, and the outer side surface of the rubber ring 501 contacts the third inner wall surface 204 of the supporting wheel 2 .

[0056] Furthermore, bolts are installed on the cover 5, and nuts are screwed on the bolts. A gap of 2 mm is left between the nut and the supporting roller shaft 1 so that the nut will not hinder the rotation of the supporting roller 2.

[0057] Of course, in this embodiment, when the outer diameter of the cover 5 is the same as the outer diameter of the roller 2, the length direction of the locking screw 502 is the same as the axis direction of the roller 2. In this case, the locking screw 502 passes through the cover 5 and is screwed to the roller 2, and the rubber ring 501 is provided between the end faces of the cover 5 and the roller 2 that are close to each other. This does not deviate from the design concept of the present invention and therefore should fall within the scope of protection of the present invention.

[0058] According to one embodiment of the present invention, Figure 7 and Figure 1 As shown, a limiting structure is also included, which is used to limit the movement of the cover 5 and the supporting wheel 2 relative to the supporting wheel shaft 1 along the direction from the abutment portion to the cover 5.

[0059] According to one embodiment of the present invention, Figure 6 As shown, the supporting wheel 2 has a second inner wall surface 203 and a third inner wall surface 204 connected thereto. The second inner wall surface 203 is arranged between the third inner wall surface 204 and the first inner wall surface 201. The diameter of the second inner wall surface 203 is smaller than the diameter of the third inner wall surface 204. A first transition surface is formed between the second inner wall surface 203 and the third inner wall surface 204.

[0060] The limiting structure includes a limiting ring groove 104 provided at one end of the stepped shaft away from the connecting shaft 102, and an elastic washer 6 is provided in the limiting ring groove 104;

[0061] The bearing assembly includes a first bearing 7 , which is disposed between the elastic washer 6 and the first transition surface. Two ends of the first bearing 7 are respectively connected to the elastic washer 6 and the first transition surface.

[0062] The supporting wheel 2 has a second inner wall surface 203 and a third inner wall surface 204 connected to each other, that is, the accommodating cavity has a second inner wall surface 203 and a third inner wall surface 204 connected to each other.

[0063] The axis of the limiting ring groove 104 coincides with the axis of the stepped shaft. A notch is provided on the elastic washer 6. When installing the elastic washer 6, the elastic washer 6 is moved so that its two ends are separated from each other, the notch becomes larger, and the elastic washer 6 is inserted into the limiting ring groove 104. When the hand is released, the elastic washer 6 is restored, and the elastic washer 6 can be quickly installed in place.

[0064] Further, such as Figure 5As shown, the stepped shaft includes a first circular shaft 105, a second circular shaft 106, and a third circular shaft 107, which are connected in sequence. The first circular shaft 105 is connected to the connecting shaft 102. The diameters of the first circular shaft 105, the second circular shaft 106, and the third circular shaft 107 decrease in sequence. A second transition surface is formed between the first circular shaft 105 and the second circular shaft 106; a third transition surface is formed between the second circular shaft 106 and the third circular shaft 107.

[0065] The third transition surface and the first transition surface are located in the same plane;

[0066] like Figure 3-Figure 6 As shown, the installation chamber includes a first annular chamber, a second annular chamber, and a third annular chamber connected in sequence. The first annular chamber is formed between the outer wall of the second circular shaft 106 and the fourth inner wall 205 of the supporting wheel 2. The second annular chamber is formed between the outer wall of the second circular shaft 106 and the second inner wall 203 of the supporting wheel 2. The third annular chamber is formed between the outer wall of the third circular shaft 107 and the third inner wall 204 of the supporting wheel 2.

[0067] The first annular chamber, the second annular chamber and the third annular chamber are communicated with each other.

[0068] The first bearing 7 is installed in the third annular chamber, and the outer ring of the first bearing 7 contacts the first transition surface toward the end face of the second circular shaft 106 to limit the movement of the supporting wheel 2 from the abutment to the cover 5, and the elastic washer 6 contacts the end face of the inner ring of the first bearing 7 toward the elastic washer 6 to limit the movement of the first bearing 7 from the abutment to the cover 5, so that the distance between the first sealing surface 103 and the second sealing surface 202 will not increase, so that the two sides of the first seal 3 can always fit with the first sealing surface 103 and the second sealing surface 202, thereby playing a good sealing role.

[0069] Furthermore, the end surface of the inner ring of the first bearing 7 facing the second circular shaft 106 contacts the third transition surface, and the elastic washer 6 and the third transition surface cooperate to limit the axial movement of the first bearing 7 along the supporting roller shaft 1.

[0070] The supporting roller 2 further includes a fourth inner wall surface 205 connected to the second inner wall surface 203. The fourth inner wall surface 205 is provided at an end of the second inner wall surface 203 away from the third inner wall surface 204. The diameter of the fourth inner wall surface 205 is greater than the diameter of the second inner wall surface 203. A fourth transition surface is formed between the second inner wall surface 203 of the supporting roller 2 and the fourth inner wall surface 205 of the supporting roller 2. The fourth transition surface is parallel to the first transition surface.

[0071] The bearing assembly includes a combined needle roller bearing 11, which is partially installed in the first annular chamber and partially installed in the second annular chamber. The combined needle roller bearing 11 includes a large diameter end and a small diameter end, and a fifth transition surface is formed between the large diameter end and the small diameter end.

[0072] The fifth transition surface contacts the fourth transition surface to limit the movement of the supporting wheel 2 along the direction from the blind cover 5 to the abutting portion.

[0073] The second transition surface contacts the end surface of the large diameter end of the combined needle roller bearing 11 away from the small diameter end. The second transition surface is used to limit the movement of the combined needle roller bearing 11 in the direction from the blind cover 5 to the abutment portion.

[0074] It should be noted that an annular gap is left between the combined needle roller bearing 11 and the first bearing 7, so as not to hinder the operation between the combined needle roller bearing 11 and the first bearing 7. The annular gap can also be used to store lubricating oil, so that the combined needle roller bearing 11 and the first bearing 7 always maintain a good rotation effect.

[0075] Of course, in this embodiment, a raised portion can be provided at one end of the cover 5 close to the abutting portion, and the raised portion abuts against the first bearing 7, which can also limit the movement of the cover 5 and the supporting roller 2 relative to the supporting roller shaft 1 along the direction from the cover 5 to the abutting portion. Its purpose does not deviate from the design concept of the present invention, and therefore, should fall within the scope of protection of the present invention.

[0076] Of course, in this embodiment, a first retaining ring is provided inside the supporting wheel 2, and the first retaining ring cooperates with the elastic washer 6 to also limit the movement of the supporting wheel 2 along the abutment portion to the blind cover 5. Its purpose does not deviate from the design concept of the present invention, and therefore, should fall within the protection scope of the present invention.

[0077] Of course, in this embodiment, the rubber ring 501 can also be directly pressed between the outer edge of the cover 5 and the third inner wall surface 204 of the supporting wheel 2 by extrusion, which can also achieve a sealing effect.

[0078] According to an embodiment of the present invention, the first sealing member 3 is a felt ring, one side of the felt ring is in contact with the first sealing surface 103 , and the other side of the felt ring is in contact with the second sealing surface 202 .

[0079] Since the felt ring is usually made of a mixture of fiber material and glue, it has softness and good plasticity, which enables the felt ring to provide a tighter sealing effect, and using the felt ring for sealing can reduce the generation of noise.

[0080] According to one embodiment of the present invention, the second sealing member 4 is a C-shaped sealing ring, the fourth inner wall surface 205 is provided with a second annular groove, the C-shaped sealing ring is arranged in the second annular groove, and the bottom wall of the second annular groove is the first inner wall surface 201 of the supporting roller 2.

[0081] The C-type sealing ring is used to prevent the lubricating oil from overflowing when lubricating the bearing assembly, providing a better sealing effect and preventing the entry of materials and dust.

[0082] Preferably, an accommodating ring groove is provided at one end of the felt ring close to the C-shaped sealing ring, and one end of the C-shaped sealing ring enters into the accommodating ring groove, thereby achieving a further sealing effect between the second sealing surface 202 and the felt ring.

[0083] According to one embodiment of the present invention, Figure 1 and Figure 2 As shown, one end of the supporting roller shaft 1 is connected to an oil filling pipe 8;

[0084] A first oil groove 9 connected to the oil filling pipe 8 is opened in the supporting roller shaft 1, and a plurality of second oil grooves 10 connected to the installation chamber are connected to the first oil groove 9.

[0085] By providing the second oil groove 10 and the first oil groove 9, lubricating oil can be supplied to the positions of the first bearing 7 and the combined needle roller bearing 11, thereby reducing the friction between the supporting roller 2 and the supporting roller shaft 1 and improving the rotation effect.

[0086] Furthermore, an annular oil groove 12 is provided on the outer side of the combined needle roller bearing 11 , and a first through hole communicating with the second oil groove 10 is provided on the annular oil groove 12 , so that the lubricating oil can better contact and lubricate the bearing assembly.

[0087] Example 2:

[0088] A discharging device includes a supporting roller assembly, a frame, a gate plate and a driving mechanism;

[0089] There is a cavity in the frame, and multiple groups of roller groups are symmetrically installed in the cavity, wherein the flange 108 in the roller group is used to be fixedly connected to the side wall of the frame, and the flange 108 is connected to the end of the abutment part away from the rotating part. The gate plate is located above the multiple groups of roller groups, and the driving mechanism drives the gate plate to move on the roller 2 in the multiple groups of roller groups. The upper end surfaces of the rollers 2 in the multiple groups of roller groups are located in the same plane. When the gate plate moves, the roller 2 rotatably connected to the roller shaft 1 through the bearing assembly rotates along its own axis, reducing the friction between the roller and the gate plate, so that the gate plate moves more smoothly.

[0090] The oil filling pipe 8 is connected to the side of the flange 108 away from the rotating part.

[0091] In the description of this utility model, it should be noted that the terms "upper" and "lower" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0092] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A supporting roller assembly, characterized in that: It comprises a supporting wheel shaft (1), a supporting wheel (2), a first sealing member (3), a second sealing member (4) and a bearing assembly; A receiving cavity is formed inside the supporting wheel (2); The supporting wheel shaft (1) comprises a rotating portion and an abutting portion, the rotating portion is inserted into the accommodating cavity, a mounting cavity is formed between the rotating portion and the supporting wheel (2), the bearing assembly is mounted in the mounting cavity, and the rotating portion is rotatably engaged with the supporting wheel (2) through the bearing assembly; One end of the supporting wheel (2) is sealedly connected to the abutting portion via a first sealing member (3); The rotating portion is provided with a first outer wall surface (101) in contact with the abutting portion, and the accommodating cavity is provided with a first inner wall surface (201) at one end close to the abutting portion; The first outer wall surface (101) and the first inner wall surface (201) are sealed and connected via a second sealing member (4).

2. A supporting wheel assembly according to claim 1, characterized in that: The rotating portion includes a stepped shaft, and the abutting portion includes a connecting shaft (102); The side of the connecting shaft (102) connected to the stepped shaft forms a first sealing surface (103), and the side of the supporting wheel (2) close to the connecting shaft (102) forms a second sealing surface (202). The first sealing surface (103) and the second sealing surface (202) are sealed and connected via the first sealing member (3).

3. A supporting wheel assembly according to claim 2, characterized in that: A blind cover (5) is provided at one end of the stepped shaft away from the connecting shaft (102), the blind cover (5) is connected to the supporting wheel (2), and the blind cover (5) is used to seal the installation chamber.

4. A supporting wheel assembly according to claim 3, characterized in that: It also includes a limiting structure, which is used to limit the movement of the cover (5) and the supporting wheel (2) relative to the supporting wheel shaft (1) along the direction from the abutment portion to the cover (5).

5. The supporting wheel assembly according to claim 4, characterized in that: The supporting wheel (2) has a second inner wall surface (203) and a third inner wall surface (204) connected thereto; the second inner wall surface (203) is arranged between the third inner wall surface (204) and the first inner wall surface (201); the diameter of the second inner wall surface (203) is smaller than the diameter of the third inner wall surface (204); and a first transition surface is formed between the second inner wall surface (203) and the third inner wall surface (204); The limiting structure comprises a limiting ring groove (104) provided at one end of the stepped shaft away from the connecting shaft (102), and an elastic washer (6) is provided in the limiting ring groove (104); The bearing assembly comprises a first bearing (7), the first bearing (7) being arranged between the elastic washer (6) and the first transition surface, and the two ends of the first bearing (7) being respectively connected to the elastic washer (6) and the first transition surface.

6. The supporting roller assembly according to claim 3, characterized in that: It also includes a fastener and a rubber ring (501), the blind cover (5) is connected to the supporting wheel (2) via the fastener, and the blind cover (5) is sealed to the supporting wheel (2) via the rubber ring (501).

7. The supporting roller assembly according to claim 1, characterized in that: The first sealing member (3) is a felt ring.

8. The supporting roller assembly according to claim 1, characterized in that: The second sealing member (4) is a C-shaped sealing ring.

9. The supporting roller assembly according to claim 1, characterized in that: One end of the supporting roller shaft (1) is connected to an oil filling pipe (8); A first oil groove (9) communicating with the oil filling pipe (8) is provided in the supporting wheel shaft (1), and a plurality of second oil grooves (10) communicating with the installation chamber are connected to the first oil groove (9).

10. A discharge device, characterized in that: A supporting wheel assembly comprising any one of claims 1-9.

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