Shaft end cap structure for a trademark paper delivery device

Abstract

The utility model belongs to trademark paper conveying device technical field discloses trademark paper conveying device's axle end cover structure. The end cover seat both ends are detachable connection with the box body and end cover body respectively, and the end cover body inner wall forms first chamber with end cover seat end face, and the end cover body inner wall and the box body outer wall form second chamber, and the end cover body is equipped with the first through -hole of intercommunication first chamber along the axial direction, and first sealing washer is arranged at first through -hole and is in butt joint with first chamber inner wall, and is sealed with push -and -go axle, and the end cover seat is equipped with the second through -hole of intercommunication second chamber and first chamber along the axial direction, and push -and -go axle and second through -hole inner wall clearance fit and are equipped with lubricating layer, and the first oil return hole and second oil return hole of end cover seat all intercommunication first chamber and second chamber, and the side wall of first chamber is equipped with the air inlet hole of connecting with outside positive pressure gas source, is used for the lubricating oil in first chamber is pressed into second chamber through first oil return hole and second oil return hole, prevents lubricating oil leakage, reduces push -and -go axle and the friction loss of cooperation surface.

Description

Technical Field

[0001] This utility model relates to the technical field of trademark paper conveying devices, and in particular to the shaft end cover structure of trademark paper conveying devices. Background Technology

[0002] In tobacco packaging production, high-speed packaging equipment places stringent demands on the stability and reliability of the label paper conveying system. Taking the GDX2 packaging machine as an example, under continuous high-speed operation, the push shaft, as the core transmission component for achieving precise label paper positioning, directly affects the stability of equipment operation due to its dynamic sealing performance. However, over long-term operation, the problem of oil leakage from the push shaft has gradually become prominent: lubricating oil continuously overflows from the sealing area, not only contaminating the equipment surface and cigarette packs (leading to an increased product scrap rate), but also accelerating the wear of the push shaft and sealing ring due to lubricating oil loss, thus increasing the equipment failure rate. Utility Model Content

[0003] The purpose of this utility model is to provide a shaft end cover structure for a label paper conveying device, so as to solve the problems of lubricating oil leakage, abnormal wear of parts and frequent maintenance caused by sealing failure in the prior art of label paper conveying devices, improve the stability and reliability of the conveying device operation, and ensure the quality consistency of continuous production.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A shaft end cap structure for a label paper conveying device. The conveying device includes a housing and a pusher shaft. The housing has a through hole on its side wall. The first end of the pusher shaft is located inside the housing, and its second end passes through the through hole and the shaft end cap structure in sequence. The pusher shaft reciprocates along its axial direction to push the label paper.

[0006] The shaft end cap structure includes an end cap body, an end cap seat, and a first sealing ring. The two ends of the end cap seat are detachably connected to the housing and the end cap body, respectively. The inner wall of the end cap body and the end face of the end cap seat form a first chamber. The inner wall of the end cap body and the outer wall of the housing form a second chamber. The end cap body has a first through hole along the axial direction that connects to the first chamber. The first sealing ring is located at the first through hole and abuts against the inner wall of the first chamber, forming a sealing fit with the push shaft. The end cap seat has a second through hole along the axial direction that connects the second chamber and the first chamber. The push shaft is clearance-fitted with the inner wall of the second through hole and has a lubricating layer. The end cap seat has a first oil return hole and a second oil return hole along the axial direction. Both the first oil return hole and the second oil return hole connect to the first chamber and the second chamber. The side wall of the first chamber has an air inlet hole that connects to an external positive pressure air source, used to press the lubricating oil in the first chamber into the second chamber through the first oil return hole and the second oil return hole.

[0007] As an optional solution for the shaft end cover structure of the trademark paper conveying device, the first oil return hole is located at the lowest position of the bottom of the second chamber for collecting lubricating oil, and the second oil return hole is arranged vertically at intervals above the first oil return hole.

[0008] As an alternative to the shaft end cover structure of the trademark paper conveying device, in the direction from the first chamber to the second chamber, the axis of the first oil return hole is arranged in a gradually inclined manner relative to the axis of the push shaft, and the axis of the second oil return hole is arranged in a gradually inclined manner relative to the axis of the push shaft.

[0009] As an optional solution for the shaft end cover structure of the trademark paper conveying device, the diameter of the first oil return hole is larger than the diameter of the second oil return hole.

[0010] As an optional solution for the shaft end cover structure of the label paper conveying device, the axial depth of the second chamber is 10 mm.

[0011] As an optional solution for the shaft end cover structure of the trademark paper conveying device, the shaft end cover structure also includes a second sealing ring. The inner wall of the end cover body is provided with an annular sealing groove, and the end face of the end cover seat is provided with an annular protrusion that matches the annular sealing groove. The second sealing ring is provided in the annular sealing groove. When the end cover body and the end cover seat are assembled, the annular protrusion presses the sealing ring to form a radial seal.

[0012] As an optional solution for the shaft end cover structure of the label paper conveying device, the first sealing ring is made of an elastic material, and the diameter of the first sealing ring is smaller than the diameter of the push shaft.

[0013] As an optional solution for the shaft end cover structure of the trademark paper conveying device, the shaft end cover structure also includes a plurality of first fasteners. The end cover body has an extension at one end near the end cover seat. The plurality of first fasteners surround the extension and pass through the extension to be fixedly connected to the end face of the end cover seat.

[0014] As an optional solution for the shaft end cover structure of the label paper conveying device, the shaft end cover structure also includes a plurality of second fasteners, which are arranged around the end cover seat and pass through the end cover seat to be fixedly connected to the housing.

[0015] As an optional solution for the shaft end cover structure of the trademark paper conveying device, the end cover seat is provided with multiple countersunk holes, and multiple second fasteners pass through the corresponding countersunk holes and are fixedly connected to the housing. The head of the second fastener is completely sunk into the countersunk hole and its top surface is flush with the end face of the end cover seat.

[0016] Beneficial effects:

[0017] This utility model provides a shaft end cover structure for a label paper conveying device. Through the sealed chamber structure formed by the end cover seat and the end cover body, and the interaction of the oil return hole on the end cover seat and the air inlet hole on the end cover body, dynamic sealing and automatic recovery of lubricating oil are achieved during the reciprocating motion of the push shaft. This structure not only effectively prevents lubricating oil leakage and reduces frictional loss between the push shaft and the mating surfaces, improving the working stability and service life of the label paper conveying device, but its unique airflow circulation design also promotes heat dissipation in the working area and continuously removes tiny particles generated by friction through airflow, keeping the moving parts clean. This integrated design ensures both sealing and lubrication effects and achieves heat dissipation and self-cleaning functions, making it suitable for the harsh operating conditions of high-speed packaging equipment operating continuously for long periods, significantly reducing maintenance frequency and improving overall production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the conveying device provided in an embodiment of the present utility model;

[0019] Figure 2 This is a cross-sectional schematic diagram of the shaft end cap structure provided in this embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the end cap seat provided in an embodiment of the present utility model.

[0021] In the picture:

[0022] 100. Housing; 200. Push shaft;

[0023] 1. End cap body; 11. First through hole; 12. Air inlet; 13. Outer extension; 14. Annular sealing groove;

[0024] 2. End cap seat; 21. Second through hole; 22. First oil return hole; 23. Second oil return hole; 24. Countersunk hole; 25. Threaded hole; 26. Annular protrusion;

[0025] 3. First sealing ring; 4. Second sealing ring; 5. First fastener; 6. First chamber; 7. Second chamber. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of the device. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper" and "lower," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] This embodiment provides a shaft end cover structure for a label paper conveying device, such as... Figure 1 As shown, the conveying device includes a housing 100 and a pusher shaft 200. The housing 100 has a through hole on its side wall. The first end of the pusher shaft 200 is located inside the housing 100, and its second end passes through the through hole and a shaft end cap structure. The pusher shaft 200 reciprocates along its axial direction to push the label paper. Figure 2As shown, the shaft end cap structure includes an end cap body 1, an end cap seat 2, and a first sealing ring 3. The two ends of the end cap seat 2 are detachably connected to the housing 100 and the end cap body 1, respectively. The inner wall of the end cap body 1 and the end face of the end cap seat 2 enclose a first chamber 6. The inner wall of the end cap body 1 and the outer wall of the housing 100 enclose a second chamber 7. The end cap body 1 has a first through hole 11 along the axial direction communicating with the first chamber 6. The first sealing ring 3 is located at the first through hole 11 and abuts against the inner wall of the first chamber 6, forming a sealing fit with the push shaft 200. The end cap seat 2 is provided with a second through hole 21 along the axial direction, which connects the second chamber 7 and the first chamber 6. The push shaft 200 is clearance-fitted with the inner wall of the second through hole 21 and is provided with a lubricating layer. The end cap seat 2 is provided with a first oil return hole 22 and a second oil return hole 23 along the axial direction. The first oil return hole 22 and the second oil return hole 23 are both connected to the first chamber 6 and the second chamber 7. The side wall of the first chamber 6 is provided with an air inlet hole 12 connected to an external positive pressure air source, which is used to press the lubricating oil in the first chamber 6 into the second chamber 7 through the first oil return hole 22 and the second oil return hole 23.

[0031] The sealed chamber structure formed by the end cap seat 2 and the end cap body 1, along with the oil return hole on the end cap seat 2 and the air inlet hole 12 on the end cap body 1, achieves dynamic sealing and automatic recovery of lubricating oil during the reciprocating motion of the push shaft 200. This structure not only effectively prevents lubricating oil leakage and reduces frictional loss between the push shaft 200 and the mating surfaces, improving the working stability and service life of the label paper conveying device, but its unique airflow circulation design also promotes heat dissipation in the working area and continuously removes tiny particles generated by friction through airflow, keeping the moving parts clean. This integrated design ensures both sealing and lubrication effects and achieves heat dissipation and self-cleaning functions, making it suitable for the harsh working conditions of long-term continuous operation of high-speed packaging equipment, significantly reducing maintenance frequency and improving overall production efficiency.

[0032] In this embodiment, the lubrication layer is the lubricating oil covering the surface of the push shaft 200. By establishing an electronic control linkage between the external air source and the drive component of the push shaft 200, the external air source is activated synchronously only when the push shaft 200 is working, and automatically shuts off when the push shaft 200 stops. This design ensures effective sealing during operation while avoiding unnecessary energy consumption and equipment wear, achieving a dual optimization of energy saving and reliable sealing. In this embodiment, the lubricating oil in the second chamber 7 flows back to the oil sump in the housing 100, where an oil pump drives the oil to spray onto the push shaft 200.

[0033] like Figure 2 and Figure 3As shown, the first oil return hole 22 is located at the lowest point of the bottom of the second chamber 7 to collect lubricating oil, and the second oil return holes 23 are arranged vertically above the first oil return hole 22. The first oil return hole 22's location at the lowest point of the bottom of the second chamber 7 allows it to effectively collect lubricating oil deposited by gravity, ensuring efficient lubricating oil recovery. Simultaneously, the second oil return holes 23 are arranged vertically above the first oil return hole 22, forming a dual high-low oil return channel. This arrangement produces a synergistic effect under air pressure. The bottom first oil return hole 22 is mainly responsible for recovering deposited lubricating oil, while the upper second oil return holes 23 assist in oil return and maintain chamber air pressure balance, preventing negative pressure or airflow turbulence caused by a single oil return hole. In actual operation, the lubricating oil forms an orderly circulating flow under the dual action of gravity and air pressure, avoiding seal failure caused by lubricating oil accumulation and ensuring uniform distribution of lubricating oil, keeping the push shaft 200 in optimal lubrication condition at all times.

[0034] like Figure 2 As shown, from the first chamber 6 to the second chamber 7, the axis of the first oil return hole 22 is gradually inclined relative to the axis of the push shaft 200, and the axis of the second oil return hole 23 is also gradually inclined relative to the axis of the push shaft 200. The first oil return hole 22 is an inclined straight channel, which allows the lubricating oil to flow in a directional manner under the combined action of gravity and air pressure. Its flow direction forms an optimal matching angle with the movement direction of the push shaft 200, which not only ensures the smooth return of the lubricating oil, but also avoids turbulence and splashing of oil in the chamber. The inclined arrangement of the two oil return holes forms a stable pressure distribution in the chamber, which allows the lubricating oil to flow in an orderly manner according to the designed path. The first oil return hole 22 is mainly responsible for recovering the lubricating oil deposited at the bottom, while the second oil return hole 23 maintains the air pressure balance and assists in the return of oil. This straight inclined structure is also easy to process and manufacture, ensuring dimensional accuracy. At the same time, the hydrodynamic effect generated by the inclined angle enhances the return power of the lubricating oil.

[0035] like Figure 2 and Figure 3 As shown, the diameter of the first oil return hole 22 is larger than the diameter of the second oil return hole 23. The larger first oil return hole 22 prioritizes the high-flux recovery of deposited lubricating oil, and its larger flow cross-sectional area effectively reduces flow resistance and prevents oil accumulation. Meanwhile, the smaller diameter second oil return hole 23, while maintaining air pressure balance, generates a moderate throttling effect by limiting the flow rate, ensuring a stable air pressure gradient within the chamber. The first oil return hole 22, as the main oil return channel, undertakes most of the lubricating oil return task, while the second oil return hole 23, as an auxiliary channel and air pressure regulating hole, works together to avoid oil stagnation caused by poor oil return and to prevent the impact of air pressure fluctuations on sealing performance.

[0036] Specifically, by increasing the diameter of the first oil return hole 22 from the traditional 2mm to 3.5mm, its flow cross-sectional area is increased from 3.14mm² to 9.62mm², an increase of 206%, significantly improving the theoretical oil return capacity. This optimized design, while maintaining the original structural layout, effectively reduces flow resistance by increasing the flow cross-section, thus significantly improving the lubricating oil return efficiency.

[0037] like Figure 2 As shown, the axial depth of the second chamber 7 is 10mm, which forms an appropriate lubricating oil buffer volume. During the high-speed reciprocating motion of the push shaft 200, this depth design effectively extends the residence time of the lubricating oil in the second chamber 7, providing sufficient oil buffering period for the return oil hole. This ensures that the lubricating oil flows smoothly and orderly to the return oil hole under pneumatic drive and gravity, avoiding oil spillage caused by instantaneous flow fluctuations. This design, by precisely controlling the matching relationship between the volume of the second chamber 7 and the flow rate of the return oil hole, maintains the rapid response capability of the lubrication system while eliminating the risk of instantaneous oil overload, making the entire oil return process more stable and controllable, and significantly improving the system's operational stability under high-speed conditions.

[0038] like Figure 2 As shown, the shaft end cover structure also includes a second sealing ring 4. The inner wall of the end cover body 1 is provided with an annular sealing groove 14, and the end face of the end cover seat 2 is provided with an annular protrusion 26 that matches the annular sealing groove 14. The second sealing ring 4 is disposed in the annular sealing groove 14. When the end cover body 1 and the end cover seat 2 are assembled, the annular protrusion 26 presses the sealing ring to form a radial seal. This structure establishes a main sealing barrier at the axial mating surface to prevent lubricating oil from leaking along the end face of the end cover seat 2; the radially compressed second sealing ring 4 generates a continuous elastic restoring force, automatically compensating for the wear gap of the mating surface caused by long-term use.

[0039] Specifically, the material of the second sealing ring 4 is selected from nitrile rubber, fluororubber, polyurethane, silicone rubber, or a composite rubber structure. By rationally selecting material properties and controlling the assembly compression ratio, sufficient sealing pressure is ensured while maintaining appropriate elasticity. This effectively prevents lubricating oil leakage, reduces motion resistance, and significantly extends the service life of the second sealing ring 4.

[0040] like Figure 2As shown, the first sealing ring 3 is made of an elastic material, and its diameter is smaller than that of the push shaft 200. The inner diameter of the first sealing ring 3 generates continuous radial contact pressure with the surface of the push shaft 200, ensuring a dynamic sealing effect during movement without increasing frictional resistance due to excessive compression. The properties of the elastic material allow the first sealing ring 3 to adaptively compensate for the microscopic unevenness of the shaft surface and the gaps caused by long-term wear, maintaining stable sealing performance. At the same time, an appropriate pre-compression allows the first sealing ring 3 to maintain moderate following ability during high-speed reciprocating motion, avoiding sealing failure due to vibration.

[0041] Specifically, the material of the first sealing ring 3 is selected from nitrile rubber, fluororubber, polyurethane, silicone rubber, or a composite rubber structure. By rationally selecting material properties and controlling the assembly compression ratio, sufficient sealing pressure is ensured while maintaining appropriate elasticity. This effectively prevents lubricating oil leakage, reduces motion resistance, and significantly extends the service life of the first sealing ring 3.

[0042] like Figure 1 and Figure 2 As shown, the shaft end cap structure also includes multiple first fasteners 5. The end cap body 1 near the end cap seat 2 has an extension portion 13. Multiple first fasteners 5 are arranged around the extension portion 13 and pass through it to be fixedly connected to the end face of the end cap seat 2. The annular distribution of the first fasteners 5 around the extension portion 13 forms a balanced force system, ensuring uniform clamping force on the mating surfaces of the end cap body 1 and the end cap seat 2, effectively guaranteeing the normal working condition of the second sealing ring 4. The structural design of the extension portion 13 increases the connection strength and facilitates assembly and positioning, ensuring consistent force on each first fastener 5. The synergistic effect of multiple first fasteners 5 significantly improves the vibration resistance of the connection structure, maintaining a stable connection even during high-speed reciprocating motion of the push shaft 200, preventing seal failure due to loosening. In this embodiment, three first fasteners 5 are included. The first fasteners 5 are screws or bolts. The three first fasteners 5 are equally spaced around the extension portion 13 and pass through it to be threadedly connected to the threaded hole 25 of the end cap seat 2.

[0043] In this embodiment, the shaft end cap structure also includes multiple second fasteners (not shown in the figure). These second fasteners encircle the end cap seat 2 and pass through it, securing it to the housing 100. The annular arrangement of the second fasteners makes the load distribution between the end cap seat 2 and the housing 100 more uniform, effectively avoiding localized stress concentration. The multi-point fixing structure significantly enhances the overall connection rigidity, reliably resisting the periodic vibration loads generated by the reciprocating motion of the push shaft 200. The annular layout of the second fasteners also optimizes the assembly process, facilitating alignment adjustment and preload control during installation. In this embodiment, three second fasteners are included. The second fasteners are screws or bolts, and the three second fasteners are equally spaced around the end cap seat 2, passing through it and threadedly connected to the housing 100. The first fastener 5 and the second fasteners are arranged at intervals.

[0044] like Figure 3 As shown, the end cap seat 2 is provided with multiple countersunk holes 24. Multiple second fasteners pass through the corresponding countersunk holes 24 and are fixedly connected to the housing 100. The heads of the second fasteners are completely recessed into the countersunk holes 24, and their top surfaces are flush with the end face of the end cap seat 2. The countersunk holes 24 keep the heads of the second fasteners flush with the end face of the end cap seat 2, which eliminates interference that may be caused by protruding parts and ensures the flatness of the assembly surface of the end cap body 1. The fully recessed fastener heads are circumferentially constrained by the walls of the countersunk holes 24, which can effectively prevent the fasteners from loosening under vibration conditions. The circumferentially distributed layout of multiple countersunk holes 24 makes the connection load symmetrically distributed, avoiding deformation of the sealing surface due to uneven force.

[0045] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A shaft end cap structure for a label paper conveying device, the conveying device comprising a housing (100) and a push shaft (200), wherein the side wall of the housing (100) is provided with a through hole, the first end of the push shaft (200) is disposed inside the housing (100), and its second end passes through the through hole and the shaft end cap structure in sequence, the push shaft (200) reciprocates along its axial direction to push the label paper, characterized in that, The shaft end cap structure includes an end cap body (1), an end cap seat (2), and a first sealing ring (3). The two ends of the end cap seat (2) are detachably connected to the housing (100) and the end cap body (1), respectively. The inner wall of the end cap body (1) and the end face of the end cap seat (2) enclose a first chamber (6). The inner wall of the end cap body (1) and the outer wall of the housing (100) enclose a second chamber (7). The end cap body (1) has a first through hole (11) axially connecting to the first chamber (6). The first sealing ring (3) is located at the first through hole (11) and abuts against the inner wall of the first chamber (6), forming a sealing fit with the push shaft (200). The end cap seat (2) is provided with a second through hole (21) along the axial direction, which connects the second chamber (7) and the first chamber (6). The push shaft (200) is in clearance fit with the inner wall of the second through hole (21) and is provided with a lubricating layer. The end cap seat (2) is provided with a first oil return hole (22) and a second oil return hole (23) along the axial direction. The first oil return hole (22) and the second oil return hole (23) are both connected to the first chamber (6) and the second chamber (7). The side wall of the first chamber (6) is provided with an air inlet hole (12) connected to an external positive pressure air source, which is used to press the lubricating oil in the first chamber (6) into the second chamber (7) through the first oil return hole (22) and the second oil return hole (23).

2. The shaft end cover structure of the trademark paper conveying device according to claim 1, characterized in that, The first oil return hole (22) is located at the lowest position of the bottom of the second chamber (7) and is used to collect lubricating oil. The second oil return hole (23) is arranged vertically above the first oil return hole (22).

3. The shaft end cover structure of the trademark paper conveying device according to claim 2, characterized in that, In the direction from the first chamber (6) to the second chamber (7), the axis of the first oil return hole (22) is gradually inclined relative to the axis of the push shaft (200), and the axis of the second oil return hole (23) is gradually inclined relative to the axis of the push shaft (200).

4. The shaft end cover structure of the trademark paper conveying device according to claim 3, characterized in that, The diameter of the first oil return hole (22) is larger than the diameter of the second oil return hole (23).

5. The shaft end cover structure of the trademark paper conveying device according to claim 1, characterized in that, The axial depth of the second chamber (7) is 10 mm.

6. The shaft end cover structure of the trademark paper conveying device according to any one of claims 1-5, characterized in that, The shaft end cover structure also includes a second sealing ring (4). The inner wall of the end cover body (1) is provided with an annular sealing groove (14). The end face of the end cover seat (2) is provided with an annular protrusion (26) that matches the annular sealing groove (14). The second sealing ring (4) is provided in the annular sealing groove (14). When the end cover body (1) and the end cover seat (2) are assembled, the annular protrusion (26) presses the sealing ring to form a radial seal.

7. The shaft end cover structure of the trademark paper conveying device according to any one of claims 1-5, characterized in that, The first sealing ring (3) is made of elastic material, and the diameter of the first sealing ring (3) is smaller than the diameter of the push shaft (200).

8. The shaft end cover structure of the trademark paper conveying device according to any one of claims 1-5, characterized in that, The shaft end cap structure also includes a plurality of first fasteners (5). The end cap body (1) has an extension (13) at one end near the end cap seat (2). The plurality of first fasteners (5) surround the extension (13) and pass through the extension (13) to be fixedly connected to the end face of the end cap seat (2).

9. The shaft end cover structure of the trademark paper conveying device according to any one of claims 1-5, characterized in that, The shaft end cap structure also includes a plurality of second fasteners, which are arranged around the end cap seat (2) and pass through the end cap seat (2) to be fixedly connected to the housing (100).

10. The shaft end cover structure of the trademark paper conveying device according to claim 9, characterized in that, The end cap seat (2) is provided with a plurality of countersunk holes (24), and a plurality of second fasteners are fixedly connected to the housing (100) by passing through the corresponding countersunk holes (24). The head of the second fastener is completely sunk into the countersunk hole (24) and its top surface is flush with the end face of the end cap seat (2).

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