Sealed conveying roller and machining method thereof

Abstract

The invention relates to the technical field of glass conveying, in particular to a sealing conveying roller and a machining method thereof. The sealing conveying roller comprises a roller body, plugs, shaft heads, end covers and threaded plugs, the peripheral face of the roller body is sleeved with a plurality of O-shaped rubber rings at intervals in the axial direction, openings in the two ends of the roller body are each in interference fit with one plug, the two plugs are spaced in the roller body, and a center through hole of each plug is in interference fit with one shaft head. The two end covers respectively penetrate through one shaft head and are in threaded connection with the plugs on the side, the intersection of the roller, the plugs and the end covers is sleeved with a sealing ring, the intersection of the shaft heads, the plugs and the end covers is also sleeved with a sealing ring, one shaft head is provided with a detection hole in a penetrating mode along the axis, and the end, extending out of the end covers, of the shaft head is provided with a threaded counter bore along the axis. And the threaded plug is screwed in the threaded counter bore and seals the detection hole. The sealing conveying roller can avoid welding, and sealing detection is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of glass conveying, and in particular to a sealed conveying roller and a processing method of the sealed conveying roller. Background Art

[0002] On the glass production line, the import and export chambers of the magnetron sputtering coating machine are responsible for the loading and unloading of materials. As a vacuum equipment, the magnetron sputtering coating machine itself needs to repeatedly evacuate the chamber. In order to improve the efficiency of loading and unloading, the most effective way is to reduce the volume of the cavity to reduce the time of vacuuming. Therefore, the glass conveying rollers in the chamber need to be designed as a sealed structure.

[0003] However, at present, the glass conveyor rollers in the chamber are generally processed by welding, which makes welding difficult or even impossible when two different materials need to be welded to complete the processing of the glass conveyor rollers. Even if welding is between the same materials, the sealing requirements of the conveyor rollers will make the processing technology complicated and the processing cost will increase. In addition, once the conveyor rollers processed by welding are found to leak, it is difficult to repair them because the secondary welding will cause serious deformation of the conveyor rollers.

[0004] Patent CN204184820U discloses a conveying roller for a vacuum glass substrate. The roller skin and the shaft head in the conveying roller of the patent are replaced by interference fit with each other instead of welding, thereby avoiding the problems caused by the welding process of the conveying roller. However, the sealing detection hole of the conveying roller of the patent is arranged on the plug part of the shaft head, and the extended section of the shaft head needs to be installed with bearings or other transmission components, which may cause inconvenience to the sealing detection due to the limited space position. In addition, the sealing detection hole of the conveying roller of the patent is sealed by a screw with a combined washer, and the sealing effect is also poor. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a sealing conveying roller which can avoid welding and is convenient for sealing detection.

[0006] The present invention adopts the following technical solution:

[0007] The present invention provides a sealed conveying roller, comprising a roller, a plug, a shaft head, an end cover and a threaded plug, wherein the outer peripheral surface of the roller is sleeved with a plurality of O-type rubber rings at intervals along the axial direction, the openings at both ends of the roller are respectively interference-fitted with a plug, the two plugs are kept at intervals in the roller, the central through hole of each plug is interference-fitted with a shaft head, the two end covers respectively pass through a shaft head and are threadedly connected with the plug, a sealing ring is sleeved at the intersection of the roller, the plug and the end cover, a sealing ring is also sleeved at the intersection of the shaft head, the plug and the end cover, and a detection hole is passed through the shaft head along the axis, a threaded countersunk hole is opened along the axis at one end of the shaft head with the detection hole extending out of the end cover, and the threaded plug is screwed into the threaded countersunk hole to seal the detection hole.

[0008] Preferably, interference fit hole sections are respectively machined at both axial ends of the roller, and both side end faces of the roller are respectively machined into sealing surfaces. The plug includes a mating column section and a limiting column section. The outer diameter of the mating column section is smaller than the outer diameter of the limiting column section, the length of the mating column section is smaller than the length of the interference fit hole section, and the side of the limiting column section facing the mating column section is machined into a sealing surface. The mating column section is inserted into the interference fit hole section and has an interference fit with the roller, and the side of the limiting column section facing the mating column section is sealed and fitted with one side end face of the roller.

[0009] Preferably, a plurality of threaded holes are processed at circumferential intervals on the side surface of the limiting column segment away from the matching column segment, and a plurality of screw mounting holes are arranged at circumferential intervals on the end cover. The screw mounting holes correspond to the threaded holes in number and position one by one, and the fastening screws pass through the screw mounting holes and are screwed into the threaded holes.

[0010] Preferably, a stopper is processed on the inner side surface of the end cover, the length of the stopper is smaller than the length of the limiting column segment, the inner diameter of the stopper is the same as the outer diameter of the limiting column segment, the outer edge of the stopper is chamfered and forms a chamfered sealing surface, the limiting column segment is inserted into the stopper, and a sealing ring is sealed in the annular gap between the chamfered sealing surface of the outer edge of the stopper and the limiting column segment and the roller.

[0011] Preferably, the shaft head is a stepped shaft structure in which the diameter of the middle shaft section is larger than the diameter of the shaft sections on both sides; the outer peripheral surface of the middle shaft section of the shaft head is finely processed into a sealing surface; a through hole is opened in the center of the end cover; the inner side surface of the end cover is chamfered around the through hole to form a chamfered sealing surface; one side shaft section of the shaft head is interference fit with the central through hole of the plug; the middle shaft section of the shaft head is installed in cooperation with the through hole of the end cover; the chamfered sealing surface of the end cover, the shaft head and the plug together form an annular cavity; a sealing ring is placed in the annular cavity.

[0012] Preferably, the head end of the threaded plug is set higher than the threaded countersunk hole, the part of the threaded plug higher than the threaded countersunk hole is milled to form a wrench force end, the bottom of the head end of the threaded plug is concavely processed to form an annular sealing groove, a sealing ring is placed in the annular sealing groove, the bottom surface of the countersunk head of the threaded countersunk hole is finely processed to form a sealing surface, the bottom of the head end of the threaded plug is fitted with the bottom surface of the countersunk head of the threaded countersunk hole, and the sealing ring seals the gap between the threaded plug and the shaft head.

[0013] The present invention also provides a method for processing the sealing conveying roller, comprising the following steps:

[0014] S1: First, install the plug and the shaft head with interference fit to form a shaft head assembly, and then install the two end openings of the roller with a shaft head assembly with interference fit respectively, and then clean the joints between the plug and the shaft head, and the joints between the plug and the roller, and install sealing rings of corresponding specifications at the joints between the plug and the shaft head, and the joints between the plug and the roller;

[0015] S2: The cleaned end cap is threadedly connected to the plug, so that the intersection of the roller, the plug and the end cap is sealed by the sealing ring to form a first sealing point, and the intersection of the shaft head, the plug and the end cap is also sealed by the sealing ring to form a second sealing point, and then the first sealing point and the second sealing point are leak-checked. If a leak is found, the leak is repaired and leaked again until no leak is detected. If no leak is found, the next step is entered;

[0016] S3: Screw the threaded plug into the threaded countersunk hole and seal the detection hole to form a third sealing point, and then check the third sealing point for leaks. If a leak is found, check for leaks again after repairing the leak until no leak is found. If no leak is found, multiple O-rings are installed on the outer circumference of the roller.

[0017] Preferably, in step S2, positive pressure leak detection is performed on the first seal and the second seal, compressed air is filled into the roller through the detection hole of the shaft head and the pressure is maintained, and soap bubble liquid is sprayed on the first seal and the second seal during the pressure maintenance process. If bubbles continue to be generated at the spraying position of the soap bubble liquid, it indicates that there is a leak.

[0018] Preferably, in step S2, negative pressure leak detection is also performed on the first seal and the second seal, helium is sprayed toward the first seal and the second seal with a spray gun, and the roller is evacuated through the detection hole on the shaft head, and the extracted gas enters the helium mass spectrometer leak detector for detection. If the helium mass spectrometer leak detector captures helium, it means that there is a leak point at the position sprayed by the spray gun.

[0019] Preferably, in step S3, helium is first filled into the roller, and then the threaded plug is screwed into the threaded countersunk hole and the detection hole is sealed. Thereafter, the entire roller structure with the threaded plug installed is placed into the leak detection cavity, and after the leak detection cavity is evacuated, it is connected to a helium mass spectrometer leak detector. If the helium mass spectrometer leak detector can capture helium, it indicates that there is a leak at the third seal.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The sealing conveying roller of the present invention is installed as a whole by interference fit, thereby avoiding problems caused by welding processing; in addition, the detection hole is a through structure opened on the shaft head along the axis, so the extended section of the shaft head will still not interfere with the detection hole after the bearing or other transmission components are installed, making the sealing detection more convenient.

[0022] The present invention also provides a method for processing the sealing conveying roller. The processing method can ensure the processing quality of the sealing conveying roller and avoid leakage problems during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1Schematic diagram of the cross-sectional structure of the sealing conveying roller in an embodiment of the present invention.

[0024] Figure 2 It is a schematic cross-sectional structure diagram of the end where the detection hole of the sealing conveying roller is located in an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the upper roller of the sealing conveying roller in an embodiment of the present invention.

[0026] Figure 4 It is a schematic cross-sectional structure diagram of a plug on a sealing conveying roller in an embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the shaft head structure in which no detection hole is provided on the sealed conveying roller in an embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of the shaft head structure with a detection hole opened on the sealed conveying roller in an embodiment of the present invention.

[0029] Figure 7 It is a schematic cross-sectional structural diagram of the upper end cover of the sealed conveying roller in an embodiment of the present invention.

[0030] Figure 8 It is a schematic structural diagram of a threaded plug on a sealing conveying roller in an embodiment of the present invention.

[0031] The reference numerals are described as follows:

[0032] 1. Roller 401, screw mounting hole

[0033] 101, annular groove 402, stop

[0034] 102, Interference fit hole section 5, Threaded plug

[0035] 2. Plug 501, wrench force end

[0036] 201, matching column section 502, annular sealing groove

[0037] 202, limit column section 6, O-type rubber ring

[0038] 203, threaded hole 7, sealing ring

[0039] 3. Shaft head 8. Fastening screw

[0040] 301, detection hole 9, first sealing point

[0041] 302, threaded countersunk hole 10, second sealing point

[0042] 4. End cover 11, third sealing point DETAILED DESCRIPTION

[0043] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0047] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 The present embodiment provides a sealed conveying roller, comprising a roller 1, a plug 2, a shaft head 3, an end cover 4 and a threaded plug 5. The outer circumferential surface of the roller 1 is sleeved with a plurality of O-type rubber rings 6 at intervals along the axial direction. The openings at both ends of the roller 1 are respectively interference fit with a plug 2, and the two plugs 2 are kept at intervals in the roller 1. The central through hole of each plug 2 is interference fit with a shaft head 3. The two end covers 4 respectively pass through a shaft head 3 and are threadedly connected with the plug 2. A sealing ring 7 is sleeved at the intersection of the roller 1, the plug 2 and the end cover 4. A sealing ring 7 is also sleeved at the intersection of the shaft head 3, the plug 2 and the end cover 4. A detection hole 301 is passed through one shaft head 3 along the axis. A threaded countersunk hole 302 is opened along the axis at one end of the shaft head 3 with the detection hole 301 extending out of the end cover 4. The threaded plug 5 is screwed into the threaded countersunk hole 302 and seals the detection hole 301.

[0048] The sealing conveying roller of this embodiment is installed as a whole by interference fit, so as to avoid problems caused by welding processing; in addition, the detection hole 301 is a through structure opened on the shaft head 3 along the axis, so the extended section of the shaft head 3 will not interfere with the detection hole 301 after the bearing or other transmission components are installed, making the sealing detection more convenient.

[0049] It should be noted that in order to reduce the weight and production cost of the conveyor roller, the roller 1 is made of a standard aluminum tube; in addition, the detection hole 301 on the shaft head 3 is used as a leak detection port and also plays a role in exhausting air when the sealed conveyor roller is installed.

[0050] Preferably, see Figure 2 and Figure 3 In this embodiment, a plurality of annular grooves 101 are provided on the outer peripheral surface of the roller 1 at intervals in the axial direction, and a plurality of O-type rubber rings 6 are sleeved in the annular grooves 101 in a one-to-one correspondence.

[0051] Preferably, see Figures 2 to 4 The axial ends of the roller 1 are respectively machined to form interference fit hole sections 102, and the end surfaces on both sides of the roller 1 are respectively machined to form sealing surfaces. The plug 2 includes a matching column section 201 and a limiting column section 202. The outer diameter of the matching column section 201 is smaller than the outer diameter of the limiting column section 202, the length of the matching column section 201 is smaller than the length of the interference fit hole section 102, and the side of the limiting column section 202 facing the matching column section 201 is machined to form a sealing surface. The matching column section 201 is inserted into the interference fit hole section 102 and is interference fit with the roller 1, and the side of the limiting column section 202 facing the matching column section 201 is sealed and fitted with one end surface of the roller 1 to ensure the connection strength.

[0052] Preferably, see Figure 1 , Figure 4 and Figure 7 A plurality of threaded holes 203 are circumferentially spaced apart on the side of the limiting column section 202 away from the matching column section 201, and a plurality of screw mounting holes 401 are circumferentially spaced apart on the end cover 4. The screw mounting holes 401 correspond to the threaded holes 203 in number and position. The fastening screws 8 pass through the screw mounting holes 401 and are screwed into the threaded holes 203, thereby realizing a threaded connection between the end cover 4 and the plug 2.

[0053] It should be noted that when using multiple fastening screws 8 to threadedly connect the end cover 4 and the plug 2, the fastening screws 8 are tightened in turn in a diagonal locking manner to make the sealing ring 7 evenly compressed to ensure that the sealing ring 7 has a good sealing effect.

[0054] Preferably, see Figure 2 , Figure 4 and Figure 7The inner side surface of the end cover 4 is processed with a stopper 402, the length of the stopper 402 is less than the length of the limiting column section 202, the inner diameter of the stopper 402 is the same as the outer diameter of the limiting column section 202, the outer edge of the stopper 402 is chamfered and forms a chamfered sealing surface, the limiting column section 202 is inserted into the stopper 402, and the annular gap between the chamfered sealing surface of the outer edge of the stopper 402 and the limiting column section 202 and the roller 1 is sealed with a sealing ring 7.

[0055] Preferably, see Figure 2 , Figure 5 and Figure 7 The shaft head 3 is a stepped shaft structure in which the diameter of the middle shaft section is larger than the diameter of the shaft sections on both sides. The outer peripheral surface of the middle shaft section of the shaft head 3 is finely machined to be a sealing surface. A through hole is opened in the center of the end cover 4. The inner side surface of the end cover 4 is chamfered around the through hole to form a chamfered sealing surface. One side shaft section of the shaft head 3 is interference fit with the central through hole of the plug 2. The middle shaft section of the shaft head 3 is installed in cooperation with the through hole of the end cover 4. The chamfered sealing surface of the end cover 4, the shaft head 3 and the plug 2 together form an annular cavity, and a sealing ring 7 is placed in the annular cavity.

[0056] Preferably, see Figure 2 , Figure 6 and Figure 8 The head end of the threaded plug 5 is higher than the threaded countersunk hole 302, and the part of the threaded plug 5 higher than the threaded countersunk hole 302 is milled to form a wrench force end 501. The bottom of the head end of the threaded plug 5 is concavely processed to form an annular sealing groove 502, and a sealing ring 7 is placed in the annular sealing groove 502. The bottom surface of the countersunk head of the threaded countersunk hole 302 is finely processed to form a sealing surface. The bottom of the head end of the threaded plug 5 fits the bottom surface of the countersunk head of the threaded countersunk hole 302, and the sealing ring 7 seals the gap between the threaded plug 5 and the shaft head 3. The setting of the annular sealing groove 502 and the sealing ring 7 can ensure the sealing effect of the detection hole 301.

[0057] In summary, the sealing conveying roller of this embodiment has good sealing performance, simple structure, easy processing and low cost.

[0058] It should be noted that the roller 1, plug 2, end cover 4, shaft head 3 and threaded plug 5 are all precision-machined parts, which are specifically processed by CNC machine tools. The processing technology is relatively mature and will not be introduced in detail here; while the sealing ring 7 and O-type rubber ring 6 can be directly purchased as standard products, and will not be introduced in detail here. The following only introduces an assembly processing method of the above-mentioned sealed conveying roller.

[0059] This embodiment also provides a method for processing the sealed conveying roller. Figures 1 to 8 , including the following steps:

[0060] S1: First, the plug 2 and the shaft head 3 are installed by interference fit to form a shaft head assembly, and then the two end openings of the roller 1 are respectively installed with a shaft head assembly by interference fit, and then the joints between the plug 2 and the shaft head 3 and the joints between the plug 2 and the roller 1 are cleaned, and the sealing ring 7 of corresponding specifications is installed at the joints between the plug 2 and the shaft head 3 and the joints between the plug 2 and the roller 1;

[0061] S2: The cleaned end cap 4 is threadedly connected with the plug 2, so that the intersection of the roller 1, the plug 2 and the end cap 4 is blocked by the sealing ring 7 to form a first sealing point 9, and the intersection of the shaft head 3, the plug 2 and the end cap 4 is also blocked by the sealing ring 7 to form a second sealing point 10, and then the first sealing point 9 and the second sealing point 10 are leak-checked. If a leak is found, the leak is repaired and then the leak is checked again until no leak is detected. If no leak is found, the next step is entered;

[0062] S3: Screw the threaded plug 5 into the threaded countersunk hole 302 and seal the detection hole 301 to form a third sealing point 11, and then check the third sealing point 11 for leaks. If a leak is found, check for leaks again after repairing the leak until no leak is found. If no leak is found, multiple O-rings 6 are sleeved on the outer circumferential surface of the roller 1.

[0063] The processing method of the sealing conveying roller provided in this embodiment can ensure the processing quality of the sealing conveying roller and avoid leakage problems during use.

[0064] The specific process of interference fit includes hot-installation process and cold-installation process. This embodiment only illustrates the hot-installation process: (1) The interference fit between the plug 2 and the shaft head 3 is as follows: first, the plug 2 is heated by an annular heating tube, and after it is heated to a set temperature and maintained for a period of time, the shaft head 3 is installed to ensure the connection strength between the plug 2 and the shaft head 3; (2) The interference fit between the roller 1 and the shaft head assembly is as follows: first, the opening part of one end of the roller 1 is heated by an annular heating tube, and after it is heated to a set temperature and maintained for a period of time, the shaft head assembly is installed to ensure the connection strength between the roller 1 and the shaft head assembly.

[0065] It should be noted that the specific set temperature and insulation time need to be determined after calculation and testing.

[0066] Preferably, see Figure 1 and Figure 2 In step S2, positive pressure leak detection is performed on the first sealing part 9 and the second sealing part 10. Compressed air is filled into the roller 1 through the detection hole 301 of the shaft head 3 and the pressure is maintained. During the pressure maintenance process, soap bubble liquid is sprayed on the first sealing part 9 and the second sealing part 10. If bubbles continue to be generated at the spraying position of the soap bubble liquid, it indicates that there is a leak.

[0067] Preferably, see Figure 1 and Figure 2 In step S2, negative pressure leak detection is also performed on the first sealing position 9 and the second sealing position 10. Helium is sprayed toward the first sealing position 9 and the second sealing position 10 with a spray gun, and the roller 1 is evacuated through the detection hole 301 on the shaft head 3. The extracted gas enters the helium mass spectrometer leak detector for detection. If the helium mass spectrometer leak detector captures helium, it means that there is a leak at the position where the spray gun is sprayed.

[0068] Preferably, see Figure 1 and Figure 2 In step S3, helium is first filled into the roller 1, and then the threaded plug 5 is screwed into the threaded countersunk hole 302 and the detection hole 301 is sealed. After that, the roller structure with the threaded plug 5 installed is placed in the leak detection cavity, and after the leak detection cavity is evacuated, it is connected to the helium mass spectrometer leak detector. If the helium mass spectrometer leak detector can capture helium, it means that there is a leak point at the third sealing point 11.

[0069] In summary, the processing method of the sealing conveying roller of this embodiment replaces welding with interference fit, which can meet the combined use of different materials and ensure a certain connection strength. At the same time, the use of multiple leak detection methods also ensures the long-term reliability of the sealing effect of the processed sealing conveying roller.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sealed conveying roller, characterized in that: The invention comprises a roller (1), a plug (2), a shaft head (3), an end cover (4) and a threaded plug (5); the outer peripheral surface of the roller (1) is sleeved with a plurality of O-shaped rubber rings (6) at intervals along the axial direction; the openings at both ends of the roller (1) are respectively interference-fitted with one of the plugs (2); the two plugs (2) are spaced apart in the roller (1); the central through hole of each of the plugs (2) is interference-fitted with one of the shaft heads (3); the two end covers (4) respectively pass through one of the shaft heads (3) and are threadedly connected to the plug (2); the roller (1) is A sealing ring (7) is sleeved at the intersection of the cylinder (1), the plug (2) and the end cover (4); a sealing ring (7) is also sleeved at the intersection of the shaft head (3), the plug (2) and the end cover (4); and a detection hole (301) is passed through one of the shaft heads (3) along the axis; one end of the shaft head (3) with the detection hole (301) extending out of the end cover (4) is provided with a threaded countersunk hole (302) along the axis; and the threaded plug (5) is screwed into the threaded countersunk hole (302) and seals the detection hole (301).

2. The sealing conveying roller according to claim 1, characterized in that: The roller (1) has two axial ends respectively machined to form interference fit hole sections (102), and the two side end surfaces of the roller (1) are respectively machined to form sealing surfaces. The plug (2) comprises a matching column section (201) and a limiting column section (202), the outer diameter of the matching column section (201) is smaller than the outer diameter of the limiting column section (202), the length of the matching column section (201) is smaller than the length of the interference fit hole section (102), and the side surface of the limiting column section (202) facing the matching column section (201) is machined to form a sealing surface, the matching column section (201) is inserted into the interference fit hole section (102) and is interference fit with the roller (1), and the side surface of the limiting column section (202) facing the matching column section (201) is sealed and fitted with one side end surface of the roller (1).

3. The sealing conveying roller according to claim 2, characterized in that: A plurality of threaded holes (203) are processed at annular intervals on the side surface of the limiting column section (202) away from the matching column section (201), and a plurality of screw mounting holes (401) are arranged at annular intervals on the end cover (4). The screw mounting holes (401) correspond to the threaded holes (203) in number and position, and the fastening screws (8) pass through the screw mounting holes (401) and are screwed into the threaded holes (203).

4. The sealing conveying roller according to claim 2, characterized in that: The inner side surface of the end cover (4) is processed with a stopper (402), the length of the stopper (402) is less than the length of the limiting column section (202), the inner diameter of the stopper (402) is the same as the outer diameter of the limiting column section (202), the outer edge of the stopper (402) is processed with a chamfer to form a chamfered sealing surface, the limiting column section (202) is inserted into the stopper (402), and a sealing ring (7) is sealed in the annular gap between the chamfered sealing surface of the outer edge of the stopper (402) and the limiting column section (202) and the roller (1).

5. The sealing conveying roller according to claim 1, characterized in that: The shaft head (3) is a stepped shaft structure in which the diameter of the middle shaft section is larger than the diameter of the shaft sections on both sides. The outer peripheral surface of the middle shaft section of the shaft head (3) is finely processed to form a sealing surface. A through hole is opened in the center of the end cover (4). The inner side surface of the end cover (4) is chamfered around the through hole to form a chamfered sealing surface. One side shaft section of the shaft head (3) is interference fit with the central through hole of the plug (2). The middle shaft section of the shaft head (3) is installed in cooperation with the through hole of the end cover (4). The chamfered sealing surface of the end cover (4) and the shaft head (3) and the plug (2) together form an annular cavity. A sealing ring (7) is placed in the annular cavity.

6. The sealing conveying roller according to claim 1, characterized in that: The head end of the threaded plug (5) is arranged higher than the threaded countersunk hole (302), and the portion of the threaded plug (5) higher than the threaded countersunk hole (302) is milled to form a wrench force end (501). The bottom of the head end of the threaded plug (5) is inwardly processed to form an annular sealing groove (502), and a sealing ring (7) is arranged in the annular sealing groove (502). The bottom surface of the countersunk head of the threaded countersunk hole (302) is finely processed to form a sealing surface. The bottom of the head end of the threaded plug (5) is in contact with the bottom surface of the countersunk head of the threaded countersunk hole (302), and the sealing ring (7) seals the gap between the threaded plug (5) and the shaft head (3).

7. The method for processing a sealed conveying roller according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: First, the plug (2) and the shaft head (3) are installed by interference fit to form a shaft head assembly, and then the two end openings of the roller (1) are installed by interference fit with one of the shaft head assemblies respectively, and then the joints between the plug (2) and the shaft head (3) and the joints between the plug (2) and the roller (1) are cleaned, and sealing rings (7) of corresponding specifications are installed at the joints between the plug (2) and the shaft head (3) and the joints between the plug (2) and the roller (1); S2: The cleaned end cap (4) is threadedly connected to the plug (2), so that the intersection of the roller (1), the plug (2) and the end cap (4) is sealed by the sealing ring (7) to form a first sealing point (9), and the intersection of the shaft head (3), the plug (2) and the end cap (4) is also sealed by the sealing ring (7) to form a second sealing point (10), and then the first sealing point (9) and the second sealing point (10) are tested for leaks. If a leak is found, the leak is repaired and then tested again until no leak is detected. If no leak is found, the next step is entered; S3: screwing the threaded plug (5) into the threaded counterbore (302) and sealing the detection hole (301) to form a third sealing point (11), and then checking for leaks at the third sealing point (11). If a leak is found, the leak is repaired and then checked again until no leak is detected. If no leak is found, multiple O-type rubber rings (6) are sleeved onto the outer circumferential surface of the roller (1).

8. The method for processing a sealed conveying roller according to claim 7, characterized in that: In step S2, positive pressure leak detection is performed on the first sealing point (9) and the second sealing point (10). Compressed air is filled into the roller (1) through the detection hole (301) of the shaft head (3) and the pressure is maintained. During the pressure maintenance process, soap bubble liquid is sprayed on the first sealing point (9) and the second sealing point (10). If bubbles continue to be generated at the spraying position of the soap bubble liquid, it indicates that a leak point exists.

9. The method for processing a sealed conveying roller according to claim 8, characterized in that: In step S2, negative pressure leak detection is also performed on the first sealing part (9) and the second sealing part (10). Helium is sprayed toward the first sealing part (9) and the second sealing part (10) with a spray gun, and the roller (1) is evacuated through the detection hole (301) on the shaft head (3). The evacuated gas enters the helium mass spectrometer leak detector for detection. If the helium mass spectrometer leak detector captures helium, it means that there is a leak at the position sprayed by the spray gun.

10. The method for processing a sealed conveying roller according to claim 7, characterized in that: In step S3, helium is first filled into the roller (1), and then the threaded plug (5) is screwed into the threaded countersunk hole (302) and the detection hole (301) is sealed. Thereafter, the roller structure with the threaded plug (5) installed is placed in the leak detection cavity, and after the leak detection cavity is evacuated, it is connected to a helium mass spectrometer leak detector. If the helium mass spectrometer leak detector can capture helium, it means that there is a leak at the third sealing point (11).

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